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 | |
36e6fea8 | 21 | void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev) |
2a519311 | 22 | { |
667503dd | 23 | struct cfg80211_scan_request *request; |
2a519311 JB |
24 | struct net_device *dev; |
25 | #ifdef CONFIG_WIRELESS_EXT | |
26 | union iwreq_data wrqu; | |
27 | #endif | |
28 | ||
667503dd JB |
29 | request = rdev->scan_req; |
30 | ||
463d0183 | 31 | dev = request->dev; |
2a519311 | 32 | |
6829c878 JB |
33 | /* |
34 | * This must be before sending the other events! | |
35 | * Otherwise, wpa_supplicant gets completely confused with | |
36 | * wext events. | |
37 | */ | |
38 | cfg80211_sme_scan_done(dev); | |
39 | ||
667503dd | 40 | if (request->aborted) |
36e6fea8 | 41 | nl80211_send_scan_aborted(rdev, dev); |
2a519311 | 42 | else |
36e6fea8 | 43 | nl80211_send_scan_done(rdev, dev); |
2a519311 JB |
44 | |
45 | #ifdef CONFIG_WIRELESS_EXT | |
667503dd | 46 | if (!request->aborted) { |
2a519311 JB |
47 | memset(&wrqu, 0, sizeof(wrqu)); |
48 | ||
49 | wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL); | |
50 | } | |
51 | #endif | |
52 | ||
53 | dev_put(dev); | |
54 | ||
36e6fea8 | 55 | rdev->scan_req = NULL; |
2a519311 JB |
56 | kfree(request); |
57 | } | |
667503dd | 58 | |
36e6fea8 JB |
59 | void __cfg80211_scan_done(struct work_struct *wk) |
60 | { | |
61 | struct cfg80211_registered_device *rdev; | |
62 | ||
63 | rdev = container_of(wk, struct cfg80211_registered_device, | |
64 | scan_done_wk); | |
65 | ||
66 | cfg80211_lock_rdev(rdev); | |
67 | ___cfg80211_scan_done(rdev); | |
68 | cfg80211_unlock_rdev(rdev); | |
69 | } | |
70 | ||
667503dd JB |
71 | void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted) |
72 | { | |
667503dd JB |
73 | WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req); |
74 | ||
75 | request->aborted = aborted; | |
76 | schedule_work(&wiphy_to_dev(request->wiphy)->scan_done_wk); | |
667503dd | 77 | } |
2a519311 JB |
78 | EXPORT_SYMBOL(cfg80211_scan_done); |
79 | ||
80 | static void bss_release(struct kref *ref) | |
81 | { | |
82 | struct cfg80211_internal_bss *bss; | |
83 | ||
84 | bss = container_of(ref, struct cfg80211_internal_bss, ref); | |
78c1c7e1 JB |
85 | if (bss->pub.free_priv) |
86 | bss->pub.free_priv(&bss->pub); | |
cd1658f5 JB |
87 | |
88 | if (bss->ies_allocated) | |
89 | kfree(bss->pub.information_elements); | |
90 | ||
19957bb3 JB |
91 | BUG_ON(atomic_read(&bss->hold)); |
92 | ||
2a519311 JB |
93 | kfree(bss); |
94 | } | |
95 | ||
cb3a8eec DW |
96 | /* must hold dev->bss_lock! */ |
97 | void cfg80211_bss_age(struct cfg80211_registered_device *dev, | |
98 | unsigned long age_secs) | |
99 | { | |
100 | struct cfg80211_internal_bss *bss; | |
101 | unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); | |
102 | ||
103 | list_for_each_entry(bss, &dev->bss_list, list) { | |
104 | bss->ts -= age_jiffies; | |
105 | } | |
106 | } | |
107 | ||
2a519311 JB |
108 | /* must hold dev->bss_lock! */ |
109 | void cfg80211_bss_expire(struct cfg80211_registered_device *dev) | |
110 | { | |
111 | struct cfg80211_internal_bss *bss, *tmp; | |
112 | bool expired = false; | |
113 | ||
114 | list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) { | |
19957bb3 JB |
115 | if (atomic_read(&bss->hold)) |
116 | continue; | |
117 | if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE)) | |
2a519311 JB |
118 | continue; |
119 | list_del(&bss->list); | |
120 | rb_erase(&bss->rbn, &dev->bss_tree); | |
121 | kref_put(&bss->ref, bss_release); | |
122 | expired = true; | |
123 | } | |
124 | ||
125 | if (expired) | |
126 | dev->bss_generation++; | |
127 | } | |
128 | ||
129 | static u8 *find_ie(u8 num, u8 *ies, size_t len) | |
130 | { | |
131 | while (len > 2 && ies[0] != num) { | |
132 | len -= ies[1] + 2; | |
133 | ies += ies[1] + 2; | |
134 | } | |
135 | if (len < 2) | |
136 | return NULL; | |
137 | if (len < 2 + ies[1]) | |
138 | return NULL; | |
139 | return ies; | |
140 | } | |
141 | ||
142 | static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2) | |
143 | { | |
144 | const u8 *ie1 = find_ie(num, ies1, len1); | |
145 | const u8 *ie2 = find_ie(num, ies2, len2); | |
146 | int r; | |
147 | ||
148 | if (!ie1 && !ie2) | |
149 | return 0; | |
cd3468ba | 150 | if (!ie1 || !ie2) |
2a519311 JB |
151 | return -1; |
152 | ||
153 | r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1])); | |
154 | if (r == 0 && ie1[1] != ie2[1]) | |
155 | return ie2[1] - ie1[1]; | |
156 | return r; | |
157 | } | |
158 | ||
159 | static bool is_bss(struct cfg80211_bss *a, | |
160 | const u8 *bssid, | |
161 | const u8 *ssid, size_t ssid_len) | |
162 | { | |
163 | const u8 *ssidie; | |
164 | ||
79420f09 | 165 | if (bssid && compare_ether_addr(a->bssid, bssid)) |
2a519311 JB |
166 | return false; |
167 | ||
79420f09 JB |
168 | if (!ssid) |
169 | return true; | |
170 | ||
2a519311 JB |
171 | ssidie = find_ie(WLAN_EID_SSID, |
172 | a->information_elements, | |
173 | a->len_information_elements); | |
174 | if (!ssidie) | |
175 | return false; | |
176 | if (ssidie[1] != ssid_len) | |
177 | return false; | |
178 | return memcmp(ssidie + 2, ssid, ssid_len) == 0; | |
179 | } | |
180 | ||
181 | static bool is_mesh(struct cfg80211_bss *a, | |
182 | const u8 *meshid, size_t meshidlen, | |
183 | const u8 *meshcfg) | |
184 | { | |
185 | const u8 *ie; | |
186 | ||
187 | if (!is_zero_ether_addr(a->bssid)) | |
188 | return false; | |
189 | ||
190 | ie = find_ie(WLAN_EID_MESH_ID, | |
191 | a->information_elements, | |
192 | a->len_information_elements); | |
193 | if (!ie) | |
194 | return false; | |
195 | if (ie[1] != meshidlen) | |
196 | return false; | |
197 | if (memcmp(ie + 2, meshid, meshidlen)) | |
198 | return false; | |
199 | ||
200 | ie = find_ie(WLAN_EID_MESH_CONFIG, | |
201 | a->information_elements, | |
202 | a->len_information_elements); | |
cd3468ba JB |
203 | if (!ie) |
204 | return false; | |
2a519311 JB |
205 | if (ie[1] != IEEE80211_MESH_CONFIG_LEN) |
206 | return false; | |
207 | ||
208 | /* | |
209 | * Ignore mesh capability (last two bytes of the IE) when | |
210 | * comparing since that may differ between stations taking | |
211 | * part in the same mesh. | |
212 | */ | |
213 | return memcmp(ie + 2, meshcfg, IEEE80211_MESH_CONFIG_LEN - 2) == 0; | |
214 | } | |
215 | ||
216 | static int cmp_bss(struct cfg80211_bss *a, | |
217 | struct cfg80211_bss *b) | |
218 | { | |
219 | int r; | |
220 | ||
221 | if (a->channel != b->channel) | |
222 | return b->channel->center_freq - a->channel->center_freq; | |
223 | ||
224 | r = memcmp(a->bssid, b->bssid, ETH_ALEN); | |
225 | if (r) | |
226 | return r; | |
227 | ||
228 | if (is_zero_ether_addr(a->bssid)) { | |
229 | r = cmp_ies(WLAN_EID_MESH_ID, | |
230 | a->information_elements, | |
231 | a->len_information_elements, | |
232 | b->information_elements, | |
233 | b->len_information_elements); | |
234 | if (r) | |
235 | return r; | |
236 | return cmp_ies(WLAN_EID_MESH_CONFIG, | |
237 | a->information_elements, | |
238 | a->len_information_elements, | |
239 | b->information_elements, | |
240 | b->len_information_elements); | |
241 | } | |
242 | ||
243 | return cmp_ies(WLAN_EID_SSID, | |
244 | a->information_elements, | |
245 | a->len_information_elements, | |
246 | b->information_elements, | |
247 | b->len_information_elements); | |
248 | } | |
249 | ||
250 | struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, | |
251 | struct ieee80211_channel *channel, | |
252 | const u8 *bssid, | |
79420f09 JB |
253 | const u8 *ssid, size_t ssid_len, |
254 | u16 capa_mask, u16 capa_val) | |
2a519311 JB |
255 | { |
256 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
257 | struct cfg80211_internal_bss *bss, *res = NULL; | |
258 | ||
259 | spin_lock_bh(&dev->bss_lock); | |
260 | ||
261 | list_for_each_entry(bss, &dev->bss_list, list) { | |
79420f09 JB |
262 | if ((bss->pub.capability & capa_mask) != capa_val) |
263 | continue; | |
2a519311 JB |
264 | if (channel && bss->pub.channel != channel) |
265 | continue; | |
266 | if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { | |
267 | res = bss; | |
268 | kref_get(&res->ref); | |
269 | break; | |
270 | } | |
271 | } | |
272 | ||
273 | spin_unlock_bh(&dev->bss_lock); | |
274 | if (!res) | |
275 | return NULL; | |
276 | return &res->pub; | |
277 | } | |
278 | EXPORT_SYMBOL(cfg80211_get_bss); | |
279 | ||
280 | struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy, | |
281 | struct ieee80211_channel *channel, | |
282 | const u8 *meshid, size_t meshidlen, | |
283 | const u8 *meshcfg) | |
284 | { | |
285 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
286 | struct cfg80211_internal_bss *bss, *res = NULL; | |
287 | ||
288 | spin_lock_bh(&dev->bss_lock); | |
289 | ||
290 | list_for_each_entry(bss, &dev->bss_list, list) { | |
291 | if (channel && bss->pub.channel != channel) | |
292 | continue; | |
293 | if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) { | |
294 | res = bss; | |
295 | kref_get(&res->ref); | |
296 | break; | |
297 | } | |
298 | } | |
299 | ||
300 | spin_unlock_bh(&dev->bss_lock); | |
301 | if (!res) | |
302 | return NULL; | |
303 | return &res->pub; | |
304 | } | |
305 | EXPORT_SYMBOL(cfg80211_get_mesh); | |
306 | ||
307 | ||
308 | static void rb_insert_bss(struct cfg80211_registered_device *dev, | |
309 | struct cfg80211_internal_bss *bss) | |
310 | { | |
311 | struct rb_node **p = &dev->bss_tree.rb_node; | |
312 | struct rb_node *parent = NULL; | |
313 | struct cfg80211_internal_bss *tbss; | |
314 | int cmp; | |
315 | ||
316 | while (*p) { | |
317 | parent = *p; | |
318 | tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); | |
319 | ||
320 | cmp = cmp_bss(&bss->pub, &tbss->pub); | |
321 | ||
322 | if (WARN_ON(!cmp)) { | |
323 | /* will sort of leak this BSS */ | |
324 | return; | |
325 | } | |
326 | ||
327 | if (cmp < 0) | |
328 | p = &(*p)->rb_left; | |
329 | else | |
330 | p = &(*p)->rb_right; | |
331 | } | |
332 | ||
333 | rb_link_node(&bss->rbn, parent, p); | |
334 | rb_insert_color(&bss->rbn, &dev->bss_tree); | |
335 | } | |
336 | ||
337 | static struct cfg80211_internal_bss * | |
338 | rb_find_bss(struct cfg80211_registered_device *dev, | |
339 | struct cfg80211_internal_bss *res) | |
340 | { | |
341 | struct rb_node *n = dev->bss_tree.rb_node; | |
342 | struct cfg80211_internal_bss *bss; | |
343 | int r; | |
344 | ||
345 | while (n) { | |
346 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); | |
347 | r = cmp_bss(&res->pub, &bss->pub); | |
348 | ||
349 | if (r == 0) | |
350 | return bss; | |
351 | else if (r < 0) | |
352 | n = n->rb_left; | |
353 | else | |
354 | n = n->rb_right; | |
355 | } | |
356 | ||
357 | return NULL; | |
358 | } | |
359 | ||
360 | static struct cfg80211_internal_bss * | |
361 | cfg80211_bss_update(struct cfg80211_registered_device *dev, | |
362 | struct cfg80211_internal_bss *res, | |
363 | bool overwrite) | |
364 | { | |
365 | struct cfg80211_internal_bss *found = NULL; | |
366 | const u8 *meshid, *meshcfg; | |
367 | ||
368 | /* | |
369 | * The reference to "res" is donated to this function. | |
370 | */ | |
371 | ||
372 | if (WARN_ON(!res->pub.channel)) { | |
373 | kref_put(&res->ref, bss_release); | |
374 | return NULL; | |
375 | } | |
376 | ||
377 | res->ts = jiffies; | |
378 | ||
379 | if (is_zero_ether_addr(res->pub.bssid)) { | |
380 | /* must be mesh, verify */ | |
381 | meshid = find_ie(WLAN_EID_MESH_ID, res->pub.information_elements, | |
382 | res->pub.len_information_elements); | |
383 | meshcfg = find_ie(WLAN_EID_MESH_CONFIG, | |
384 | res->pub.information_elements, | |
385 | res->pub.len_information_elements); | |
386 | if (!meshid || !meshcfg || | |
387 | meshcfg[1] != IEEE80211_MESH_CONFIG_LEN) { | |
388 | /* bogus mesh */ | |
389 | kref_put(&res->ref, bss_release); | |
390 | return NULL; | |
391 | } | |
392 | } | |
393 | ||
394 | spin_lock_bh(&dev->bss_lock); | |
395 | ||
396 | found = rb_find_bss(dev, res); | |
397 | ||
cd1658f5 | 398 | if (found) { |
2a519311 JB |
399 | found->pub.beacon_interval = res->pub.beacon_interval; |
400 | found->pub.tsf = res->pub.tsf; | |
401 | found->pub.signal = res->pub.signal; | |
2a519311 JB |
402 | found->pub.capability = res->pub.capability; |
403 | found->ts = res->ts; | |
cd1658f5 JB |
404 | |
405 | /* overwrite IEs */ | |
406 | if (overwrite) { | |
407 | size_t used = dev->wiphy.bss_priv_size + sizeof(*res); | |
408 | size_t ielen = res->pub.len_information_elements; | |
409 | ||
44e1b98f | 410 | if (!found->ies_allocated && ksize(found) >= used + ielen) { |
cd1658f5 JB |
411 | memcpy(found->pub.information_elements, |
412 | res->pub.information_elements, ielen); | |
413 | found->pub.len_information_elements = ielen; | |
414 | } else { | |
415 | u8 *ies = found->pub.information_elements; | |
416 | ||
273de92c MB |
417 | if (found->ies_allocated) |
418 | ies = krealloc(ies, ielen, GFP_ATOMIC); | |
419 | else | |
cd1658f5 JB |
420 | ies = kmalloc(ielen, GFP_ATOMIC); |
421 | ||
422 | if (ies) { | |
423 | memcpy(ies, res->pub.information_elements, ielen); | |
424 | found->ies_allocated = true; | |
425 | found->pub.information_elements = ies; | |
c0f0aac0 | 426 | found->pub.len_information_elements = ielen; |
cd1658f5 JB |
427 | } |
428 | } | |
429 | } | |
430 | ||
2a519311 JB |
431 | kref_put(&res->ref, bss_release); |
432 | } else { | |
433 | /* this "consumes" the reference */ | |
434 | list_add_tail(&res->list, &dev->bss_list); | |
435 | rb_insert_bss(dev, res); | |
436 | found = res; | |
437 | } | |
438 | ||
439 | dev->bss_generation++; | |
440 | spin_unlock_bh(&dev->bss_lock); | |
441 | ||
442 | kref_get(&found->ref); | |
443 | return found; | |
444 | } | |
445 | ||
06aa7afa JK |
446 | struct cfg80211_bss* |
447 | cfg80211_inform_bss(struct wiphy *wiphy, | |
448 | struct ieee80211_channel *channel, | |
449 | const u8 *bssid, | |
450 | u64 timestamp, u16 capability, u16 beacon_interval, | |
451 | const u8 *ie, size_t ielen, | |
452 | s32 signal, gfp_t gfp) | |
453 | { | |
454 | struct cfg80211_internal_bss *res; | |
455 | size_t privsz; | |
456 | ||
457 | if (WARN_ON(!wiphy)) | |
458 | return NULL; | |
459 | ||
460 | privsz = wiphy->bss_priv_size; | |
461 | ||
462 | if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC && | |
463 | (signal < 0 || signal > 100))) | |
464 | return NULL; | |
465 | ||
466 | res = kzalloc(sizeof(*res) + privsz + ielen, gfp); | |
467 | if (!res) | |
468 | return NULL; | |
469 | ||
470 | memcpy(res->pub.bssid, bssid, ETH_ALEN); | |
471 | res->pub.channel = channel; | |
472 | res->pub.signal = signal; | |
473 | res->pub.tsf = timestamp; | |
474 | res->pub.beacon_interval = beacon_interval; | |
475 | res->pub.capability = capability; | |
476 | /* point to after the private area */ | |
477 | res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz; | |
478 | memcpy(res->pub.information_elements, ie, ielen); | |
479 | res->pub.len_information_elements = ielen; | |
480 | ||
481 | kref_init(&res->ref); | |
482 | ||
483 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, 0); | |
484 | if (!res) | |
485 | return NULL; | |
486 | ||
487 | if (res->pub.capability & WLAN_CAPABILITY_ESS) | |
488 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
489 | ||
490 | /* cfg80211_bss_update gives us a referenced result */ | |
491 | return &res->pub; | |
492 | } | |
493 | EXPORT_SYMBOL(cfg80211_inform_bss); | |
494 | ||
2a519311 JB |
495 | struct cfg80211_bss * |
496 | cfg80211_inform_bss_frame(struct wiphy *wiphy, | |
497 | struct ieee80211_channel *channel, | |
498 | struct ieee80211_mgmt *mgmt, size_t len, | |
77965c97 | 499 | s32 signal, gfp_t gfp) |
2a519311 JB |
500 | { |
501 | struct cfg80211_internal_bss *res; | |
502 | size_t ielen = len - offsetof(struct ieee80211_mgmt, | |
503 | u.probe_resp.variable); | |
504 | bool overwrite; | |
505 | size_t privsz = wiphy->bss_priv_size; | |
506 | ||
77965c97 | 507 | if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC && |
2a519311 JB |
508 | (signal < 0 || signal > 100))) |
509 | return NULL; | |
510 | ||
511 | if (WARN_ON(!mgmt || !wiphy || | |
512 | len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) | |
513 | return NULL; | |
514 | ||
515 | res = kzalloc(sizeof(*res) + privsz + ielen, gfp); | |
516 | if (!res) | |
517 | return NULL; | |
518 | ||
519 | memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN); | |
520 | res->pub.channel = channel; | |
2a519311 JB |
521 | res->pub.signal = signal; |
522 | res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); | |
523 | res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); | |
524 | res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); | |
525 | /* point to after the private area */ | |
526 | res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz; | |
527 | memcpy(res->pub.information_elements, mgmt->u.probe_resp.variable, ielen); | |
528 | res->pub.len_information_elements = ielen; | |
529 | ||
530 | kref_init(&res->ref); | |
531 | ||
532 | overwrite = ieee80211_is_probe_resp(mgmt->frame_control); | |
533 | ||
534 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, overwrite); | |
535 | if (!res) | |
536 | return NULL; | |
537 | ||
e38f8a7a LR |
538 | if (res->pub.capability & WLAN_CAPABILITY_ESS) |
539 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
540 | ||
2a519311 JB |
541 | /* cfg80211_bss_update gives us a referenced result */ |
542 | return &res->pub; | |
543 | } | |
544 | EXPORT_SYMBOL(cfg80211_inform_bss_frame); | |
545 | ||
546 | void cfg80211_put_bss(struct cfg80211_bss *pub) | |
547 | { | |
548 | struct cfg80211_internal_bss *bss; | |
549 | ||
550 | if (!pub) | |
551 | return; | |
552 | ||
553 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
554 | kref_put(&bss->ref, bss_release); | |
555 | } | |
556 | EXPORT_SYMBOL(cfg80211_put_bss); | |
557 | ||
d491af19 JB |
558 | void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
559 | { | |
560 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
561 | struct cfg80211_internal_bss *bss; | |
562 | ||
563 | if (WARN_ON(!pub)) | |
564 | return; | |
565 | ||
566 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
567 | ||
568 | spin_lock_bh(&dev->bss_lock); | |
569 | ||
570 | list_del(&bss->list); | |
f5ea9120 | 571 | dev->bss_generation++; |
d491af19 JB |
572 | rb_erase(&bss->rbn, &dev->bss_tree); |
573 | ||
574 | spin_unlock_bh(&dev->bss_lock); | |
575 | ||
576 | kref_put(&bss->ref, bss_release); | |
577 | } | |
578 | EXPORT_SYMBOL(cfg80211_unlink_bss); | |
579 | ||
2a519311 JB |
580 | #ifdef CONFIG_WIRELESS_EXT |
581 | int cfg80211_wext_siwscan(struct net_device *dev, | |
582 | struct iw_request_info *info, | |
583 | union iwreq_data *wrqu, char *extra) | |
584 | { | |
585 | struct cfg80211_registered_device *rdev; | |
586 | struct wiphy *wiphy; | |
587 | struct iw_scan_req *wreq = NULL; | |
588 | struct cfg80211_scan_request *creq; | |
589 | int i, err, n_channels = 0; | |
590 | enum ieee80211_band band; | |
591 | ||
592 | if (!netif_running(dev)) | |
593 | return -ENETDOWN; | |
594 | ||
463d0183 | 595 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
596 | |
597 | if (IS_ERR(rdev)) | |
598 | return PTR_ERR(rdev); | |
599 | ||
600 | if (rdev->scan_req) { | |
601 | err = -EBUSY; | |
602 | goto out; | |
603 | } | |
604 | ||
605 | wiphy = &rdev->wiphy; | |
606 | ||
607 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) | |
608 | if (wiphy->bands[band]) | |
609 | n_channels += wiphy->bands[band]->n_channels; | |
610 | ||
611 | creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + | |
612 | n_channels * sizeof(void *), | |
613 | GFP_ATOMIC); | |
614 | if (!creq) { | |
615 | err = -ENOMEM; | |
616 | goto out; | |
617 | } | |
618 | ||
619 | creq->wiphy = wiphy; | |
463d0183 | 620 | creq->dev = dev; |
5ba63533 JB |
621 | /* SSIDs come after channels */ |
622 | creq->ssids = (void *)&creq->channels[n_channels]; | |
2a519311 JB |
623 | creq->n_channels = n_channels; |
624 | creq->n_ssids = 1; | |
625 | ||
626 | /* all channels */ | |
627 | i = 0; | |
628 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
629 | int j; | |
630 | if (!wiphy->bands[band]) | |
631 | continue; | |
632 | for (j = 0; j < wiphy->bands[band]->n_channels; j++) { | |
633 | creq->channels[i] = &wiphy->bands[band]->channels[j]; | |
634 | i++; | |
635 | } | |
636 | } | |
637 | ||
638 | /* translate scan request */ | |
639 | if (wrqu->data.length == sizeof(struct iw_scan_req)) { | |
640 | wreq = (struct iw_scan_req *)extra; | |
641 | ||
642 | if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { | |
643 | if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) | |
644 | return -EINVAL; | |
645 | memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); | |
646 | creq->ssids[0].ssid_len = wreq->essid_len; | |
647 | } | |
648 | if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) | |
649 | creq->n_ssids = 0; | |
650 | } | |
651 | ||
652 | rdev->scan_req = creq; | |
653 | err = rdev->ops->scan(wiphy, dev, creq); | |
654 | if (err) { | |
655 | rdev->scan_req = NULL; | |
656 | kfree(creq); | |
463d0183 | 657 | } else { |
a538e2d5 | 658 | nl80211_send_scan_start(rdev, dev); |
463d0183 JB |
659 | dev_hold(dev); |
660 | } | |
2a519311 | 661 | out: |
4d0c8aea | 662 | cfg80211_unlock_rdev(rdev); |
2a519311 JB |
663 | return err; |
664 | } | |
ba44cb72 | 665 | EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan); |
2a519311 JB |
666 | |
667 | static void ieee80211_scan_add_ies(struct iw_request_info *info, | |
668 | struct cfg80211_bss *bss, | |
669 | char **current_ev, char *end_buf) | |
670 | { | |
671 | u8 *pos, *end, *next; | |
672 | struct iw_event iwe; | |
673 | ||
674 | if (!bss->information_elements || | |
675 | !bss->len_information_elements) | |
676 | return; | |
677 | ||
678 | /* | |
679 | * If needed, fragment the IEs buffer (at IE boundaries) into short | |
680 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. | |
681 | */ | |
682 | pos = bss->information_elements; | |
683 | end = pos + bss->len_information_elements; | |
684 | ||
685 | while (end - pos > IW_GENERIC_IE_MAX) { | |
686 | next = pos + 2 + pos[1]; | |
687 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) | |
688 | next = next + 2 + next[1]; | |
689 | ||
690 | memset(&iwe, 0, sizeof(iwe)); | |
691 | iwe.cmd = IWEVGENIE; | |
692 | iwe.u.data.length = next - pos; | |
693 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
694 | end_buf, &iwe, pos); | |
695 | ||
696 | pos = next; | |
697 | } | |
698 | ||
699 | if (end > pos) { | |
700 | memset(&iwe, 0, sizeof(iwe)); | |
701 | iwe.cmd = IWEVGENIE; | |
702 | iwe.u.data.length = end - pos; | |
703 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
704 | end_buf, &iwe, pos); | |
705 | } | |
706 | } | |
707 | ||
cb3a8eec DW |
708 | static inline unsigned int elapsed_jiffies_msecs(unsigned long start) |
709 | { | |
710 | unsigned long end = jiffies; | |
711 | ||
712 | if (end >= start) | |
713 | return jiffies_to_msecs(end - start); | |
714 | ||
715 | return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1); | |
716 | } | |
2a519311 JB |
717 | |
718 | static char * | |
77965c97 JB |
719 | ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, |
720 | struct cfg80211_internal_bss *bss, char *current_ev, | |
721 | char *end_buf) | |
2a519311 JB |
722 | { |
723 | struct iw_event iwe; | |
724 | u8 *buf, *cfg, *p; | |
725 | u8 *ie = bss->pub.information_elements; | |
a77b8552 | 726 | int rem = bss->pub.len_information_elements, i, sig; |
2a519311 JB |
727 | bool ismesh = false; |
728 | ||
729 | memset(&iwe, 0, sizeof(iwe)); | |
730 | iwe.cmd = SIOCGIWAP; | |
731 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; | |
732 | memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); | |
733 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
734 | IW_EV_ADDR_LEN); | |
735 | ||
736 | memset(&iwe, 0, sizeof(iwe)); | |
737 | iwe.cmd = SIOCGIWFREQ; | |
738 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); | |
739 | iwe.u.freq.e = 0; | |
740 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
741 | IW_EV_FREQ_LEN); | |
742 | ||
743 | memset(&iwe, 0, sizeof(iwe)); | |
744 | iwe.cmd = SIOCGIWFREQ; | |
745 | iwe.u.freq.m = bss->pub.channel->center_freq; | |
746 | iwe.u.freq.e = 6; | |
747 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
748 | IW_EV_FREQ_LEN); | |
749 | ||
77965c97 | 750 | if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { |
2a519311 JB |
751 | memset(&iwe, 0, sizeof(iwe)); |
752 | iwe.cmd = IWEVQUAL; | |
753 | iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | | |
754 | IW_QUAL_NOISE_INVALID | | |
a77b8552 | 755 | IW_QUAL_QUAL_UPDATED; |
77965c97 | 756 | switch (wiphy->signal_type) { |
2a519311 | 757 | case CFG80211_SIGNAL_TYPE_MBM: |
a77b8552 JB |
758 | sig = bss->pub.signal / 100; |
759 | iwe.u.qual.level = sig; | |
2a519311 | 760 | iwe.u.qual.updated |= IW_QUAL_DBM; |
a77b8552 JB |
761 | if (sig < -110) /* rather bad */ |
762 | sig = -110; | |
763 | else if (sig > -40) /* perfect */ | |
764 | sig = -40; | |
765 | /* will give a range of 0 .. 70 */ | |
766 | iwe.u.qual.qual = sig + 110; | |
2a519311 JB |
767 | break; |
768 | case CFG80211_SIGNAL_TYPE_UNSPEC: | |
769 | iwe.u.qual.level = bss->pub.signal; | |
a77b8552 JB |
770 | /* will give range 0 .. 100 */ |
771 | iwe.u.qual.qual = bss->pub.signal; | |
2a519311 JB |
772 | break; |
773 | default: | |
774 | /* not reached */ | |
775 | break; | |
776 | } | |
777 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
778 | &iwe, IW_EV_QUAL_LEN); | |
779 | } | |
780 | ||
781 | memset(&iwe, 0, sizeof(iwe)); | |
782 | iwe.cmd = SIOCGIWENCODE; | |
783 | if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) | |
784 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; | |
785 | else | |
786 | iwe.u.data.flags = IW_ENCODE_DISABLED; | |
787 | iwe.u.data.length = 0; | |
788 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
789 | &iwe, ""); | |
790 | ||
791 | while (rem >= 2) { | |
792 | /* invalid data */ | |
793 | if (ie[1] > rem - 2) | |
794 | break; | |
795 | ||
796 | switch (ie[0]) { | |
797 | case WLAN_EID_SSID: | |
798 | memset(&iwe, 0, sizeof(iwe)); | |
799 | iwe.cmd = SIOCGIWESSID; | |
800 | iwe.u.data.length = ie[1]; | |
801 | iwe.u.data.flags = 1; | |
802 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
803 | &iwe, ie + 2); | |
804 | break; | |
805 | case WLAN_EID_MESH_ID: | |
806 | memset(&iwe, 0, sizeof(iwe)); | |
807 | iwe.cmd = SIOCGIWESSID; | |
808 | iwe.u.data.length = ie[1]; | |
809 | iwe.u.data.flags = 1; | |
810 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
811 | &iwe, ie + 2); | |
812 | break; | |
813 | case WLAN_EID_MESH_CONFIG: | |
814 | ismesh = true; | |
815 | if (ie[1] != IEEE80211_MESH_CONFIG_LEN) | |
816 | break; | |
817 | buf = kmalloc(50, GFP_ATOMIC); | |
818 | if (!buf) | |
819 | break; | |
820 | cfg = ie + 2; | |
821 | memset(&iwe, 0, sizeof(iwe)); | |
822 | iwe.cmd = IWEVCUSTOM; | |
823 | sprintf(buf, "Mesh network (version %d)", cfg[0]); | |
824 | iwe.u.data.length = strlen(buf); | |
825 | current_ev = iwe_stream_add_point(info, current_ev, | |
826 | end_buf, | |
827 | &iwe, buf); | |
828 | sprintf(buf, "Path Selection Protocol ID: " | |
829 | "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3], | |
830 | cfg[4]); | |
831 | iwe.u.data.length = strlen(buf); | |
832 | current_ev = iwe_stream_add_point(info, current_ev, | |
833 | end_buf, | |
834 | &iwe, buf); | |
835 | sprintf(buf, "Path Selection Metric ID: " | |
836 | "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7], | |
837 | cfg[8]); | |
838 | iwe.u.data.length = strlen(buf); | |
839 | current_ev = iwe_stream_add_point(info, current_ev, | |
840 | end_buf, | |
841 | &iwe, buf); | |
842 | sprintf(buf, "Congestion Control Mode ID: " | |
843 | "0x%02X%02X%02X%02X", cfg[9], cfg[10], | |
844 | cfg[11], cfg[12]); | |
845 | iwe.u.data.length = strlen(buf); | |
846 | current_ev = iwe_stream_add_point(info, current_ev, | |
847 | end_buf, | |
848 | &iwe, buf); | |
849 | sprintf(buf, "Channel Precedence: " | |
850 | "0x%02X%02X%02X%02X", cfg[13], cfg[14], | |
851 | cfg[15], cfg[16]); | |
852 | iwe.u.data.length = strlen(buf); | |
853 | current_ev = iwe_stream_add_point(info, current_ev, | |
854 | end_buf, | |
855 | &iwe, buf); | |
856 | kfree(buf); | |
857 | break; | |
858 | case WLAN_EID_SUPP_RATES: | |
859 | case WLAN_EID_EXT_SUPP_RATES: | |
860 | /* display all supported rates in readable format */ | |
861 | p = current_ev + iwe_stream_lcp_len(info); | |
862 | ||
863 | memset(&iwe, 0, sizeof(iwe)); | |
864 | iwe.cmd = SIOCGIWRATE; | |
865 | /* Those two flags are ignored... */ | |
866 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; | |
867 | ||
868 | for (i = 0; i < ie[1]; i++) { | |
869 | iwe.u.bitrate.value = | |
870 | ((ie[i + 2] & 0x7f) * 500000); | |
871 | p = iwe_stream_add_value(info, current_ev, p, | |
872 | end_buf, &iwe, IW_EV_PARAM_LEN); | |
873 | } | |
874 | current_ev = p; | |
875 | break; | |
876 | } | |
877 | rem -= ie[1] + 2; | |
878 | ie += ie[1] + 2; | |
879 | } | |
880 | ||
881 | if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) | |
882 | || ismesh) { | |
883 | memset(&iwe, 0, sizeof(iwe)); | |
884 | iwe.cmd = SIOCGIWMODE; | |
885 | if (ismesh) | |
886 | iwe.u.mode = IW_MODE_MESH; | |
887 | else if (bss->pub.capability & WLAN_CAPABILITY_ESS) | |
888 | iwe.u.mode = IW_MODE_MASTER; | |
889 | else | |
890 | iwe.u.mode = IW_MODE_ADHOC; | |
891 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
892 | &iwe, IW_EV_UINT_LEN); | |
893 | } | |
894 | ||
895 | buf = kmalloc(30, GFP_ATOMIC); | |
896 | if (buf) { | |
897 | memset(&iwe, 0, sizeof(iwe)); | |
898 | iwe.cmd = IWEVCUSTOM; | |
899 | sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf)); | |
900 | iwe.u.data.length = strlen(buf); | |
901 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
902 | &iwe, buf); | |
903 | memset(&iwe, 0, sizeof(iwe)); | |
904 | iwe.cmd = IWEVCUSTOM; | |
cb3a8eec DW |
905 | sprintf(buf, " Last beacon: %ums ago", |
906 | elapsed_jiffies_msecs(bss->ts)); | |
2a519311 JB |
907 | iwe.u.data.length = strlen(buf); |
908 | current_ev = iwe_stream_add_point(info, current_ev, | |
909 | end_buf, &iwe, buf); | |
910 | kfree(buf); | |
911 | } | |
912 | ||
913 | ieee80211_scan_add_ies(info, &bss->pub, ¤t_ev, end_buf); | |
914 | ||
915 | return current_ev; | |
916 | } | |
917 | ||
918 | ||
919 | static int ieee80211_scan_results(struct cfg80211_registered_device *dev, | |
920 | struct iw_request_info *info, | |
921 | char *buf, size_t len) | |
922 | { | |
923 | char *current_ev = buf; | |
924 | char *end_buf = buf + len; | |
925 | struct cfg80211_internal_bss *bss; | |
926 | ||
927 | spin_lock_bh(&dev->bss_lock); | |
928 | cfg80211_bss_expire(dev); | |
929 | ||
930 | list_for_each_entry(bss, &dev->bss_list, list) { | |
931 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { | |
932 | spin_unlock_bh(&dev->bss_lock); | |
933 | return -E2BIG; | |
934 | } | |
77965c97 JB |
935 | current_ev = ieee80211_bss(&dev->wiphy, info, bss, |
936 | current_ev, end_buf); | |
2a519311 JB |
937 | } |
938 | spin_unlock_bh(&dev->bss_lock); | |
939 | return current_ev - buf; | |
940 | } | |
941 | ||
942 | ||
943 | int cfg80211_wext_giwscan(struct net_device *dev, | |
944 | struct iw_request_info *info, | |
945 | struct iw_point *data, char *extra) | |
946 | { | |
947 | struct cfg80211_registered_device *rdev; | |
948 | int res; | |
949 | ||
950 | if (!netif_running(dev)) | |
951 | return -ENETDOWN; | |
952 | ||
463d0183 | 953 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
954 | |
955 | if (IS_ERR(rdev)) | |
956 | return PTR_ERR(rdev); | |
957 | ||
958 | if (rdev->scan_req) { | |
959 | res = -EAGAIN; | |
960 | goto out; | |
961 | } | |
962 | ||
963 | res = ieee80211_scan_results(rdev, info, extra, data->length); | |
964 | data->length = 0; | |
965 | if (res >= 0) { | |
966 | data->length = res; | |
967 | res = 0; | |
968 | } | |
969 | ||
970 | out: | |
4d0c8aea | 971 | cfg80211_unlock_rdev(rdev); |
2a519311 JB |
972 | return res; |
973 | } | |
ba44cb72 | 974 | EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan); |
2a519311 | 975 | #endif |