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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" | |
17 | #include "wext-compat.h" | |
18 | ||
19 | #define IEEE80211_SCAN_RESULT_EXPIRE (15 * HZ) | |
20 | ||
21 | void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak) | |
22 | { | |
23 | struct cfg80211_scan_request *request; | |
24 | struct net_device *dev; | |
25 | #ifdef CONFIG_WIRELESS_EXT | |
26 | union iwreq_data wrqu; | |
27 | #endif | |
28 | ||
29 | ASSERT_RDEV_LOCK(rdev); | |
30 | ||
31 | request = rdev->scan_req; | |
32 | ||
33 | if (!request) | |
34 | return; | |
35 | ||
36 | dev = request->dev; | |
37 | ||
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 | ||
45 | if (request->aborted) | |
46 | nl80211_send_scan_aborted(rdev, dev); | |
47 | else | |
48 | nl80211_send_scan_done(rdev, dev); | |
49 | ||
50 | #ifdef CONFIG_WIRELESS_EXT | |
51 | if (!request->aborted) { | |
52 | memset(&wrqu, 0, sizeof(wrqu)); | |
53 | ||
54 | wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL); | |
55 | } | |
56 | #endif | |
57 | ||
58 | dev_put(dev); | |
59 | ||
60 | rdev->scan_req = NULL; | |
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); | |
72 | } | |
73 | ||
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); | |
82 | ___cfg80211_scan_done(rdev, false); | |
83 | cfg80211_unlock_rdev(rdev); | |
84 | } | |
85 | ||
86 | void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted) | |
87 | { | |
88 | WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req); | |
89 | ||
90 | request->aborted = aborted; | |
91 | schedule_work(&wiphy_to_dev(request->wiphy)->scan_done_wk); | |
92 | } | |
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); | |
100 | if (bss->pub.free_priv) | |
101 | bss->pub.free_priv(&bss->pub); | |
102 | ||
103 | if (bss->ies_allocated) | |
104 | kfree(bss->pub.information_elements); | |
105 | ||
106 | BUG_ON(atomic_read(&bss->hold)); | |
107 | ||
108 | kfree(bss); | |
109 | } | |
110 | ||
111 | /* must hold dev->bss_lock! */ | |
112 | void cfg80211_bss_age(struct cfg80211_registered_device *dev, | |
113 | unsigned long age_secs) | |
114 | { | |
115 | struct cfg80211_internal_bss *bss; | |
116 | unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); | |
117 | ||
118 | list_for_each_entry(bss, &dev->bss_list, list) { | |
119 | bss->ts -= age_jiffies; | |
120 | } | |
121 | } | |
122 | ||
123 | /* must hold dev->bss_lock! */ | |
124 | void cfg80211_bss_expire(struct cfg80211_registered_device *dev) | |
125 | { | |
126 | struct cfg80211_internal_bss *bss, *tmp; | |
127 | bool expired = false; | |
128 | ||
129 | list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) { | |
130 | if (atomic_read(&bss->hold)) | |
131 | continue; | |
132 | if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE)) | |
133 | continue; | |
134 | list_del(&bss->list); | |
135 | rb_erase(&bss->rbn, &dev->bss_tree); | |
136 | kref_put(&bss->ref, bss_release); | |
137 | expired = true; | |
138 | } | |
139 | ||
140 | if (expired) | |
141 | dev->bss_generation++; | |
142 | } | |
143 | ||
144 | static u8 *find_ie(u8 num, u8 *ies, int len) | |
145 | { | |
146 | while (len > 2 && ies[0] != num) { | |
147 | len -= ies[1] + 2; | |
148 | ies += ies[1] + 2; | |
149 | } | |
150 | if (len < 2) | |
151 | return NULL; | |
152 | if (len < 2 + ies[1]) | |
153 | return NULL; | |
154 | return ies; | |
155 | } | |
156 | ||
157 | static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2) | |
158 | { | |
159 | const u8 *ie1 = find_ie(num, ies1, len1); | |
160 | const u8 *ie2 = find_ie(num, ies2, len2); | |
161 | int r; | |
162 | ||
163 | if (!ie1 && !ie2) | |
164 | return 0; | |
165 | if (!ie1 || !ie2) | |
166 | return -1; | |
167 | ||
168 | r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1])); | |
169 | if (r == 0 && ie1[1] != ie2[1]) | |
170 | return ie2[1] - ie1[1]; | |
171 | return r; | |
172 | } | |
173 | ||
174 | static bool is_bss(struct cfg80211_bss *a, | |
175 | const u8 *bssid, | |
176 | const u8 *ssid, size_t ssid_len) | |
177 | { | |
178 | const u8 *ssidie; | |
179 | ||
180 | if (bssid && compare_ether_addr(a->bssid, bssid)) | |
181 | return false; | |
182 | ||
183 | if (!ssid) | |
184 | return true; | |
185 | ||
186 | ssidie = find_ie(WLAN_EID_SSID, | |
187 | a->information_elements, | |
188 | a->len_information_elements); | |
189 | if (!ssidie) | |
190 | return false; | |
191 | if (ssidie[1] != ssid_len) | |
192 | return false; | |
193 | return memcmp(ssidie + 2, ssid, ssid_len) == 0; | |
194 | } | |
195 | ||
196 | static bool is_mesh(struct cfg80211_bss *a, | |
197 | const u8 *meshid, size_t meshidlen, | |
198 | const u8 *meshcfg) | |
199 | { | |
200 | const u8 *ie; | |
201 | ||
202 | if (!is_zero_ether_addr(a->bssid)) | |
203 | return false; | |
204 | ||
205 | ie = find_ie(WLAN_EID_MESH_ID, | |
206 | a->information_elements, | |
207 | a->len_information_elements); | |
208 | if (!ie) | |
209 | return false; | |
210 | if (ie[1] != meshidlen) | |
211 | return false; | |
212 | if (memcmp(ie + 2, meshid, meshidlen)) | |
213 | return false; | |
214 | ||
215 | ie = find_ie(WLAN_EID_MESH_CONFIG, | |
216 | a->information_elements, | |
217 | a->len_information_elements); | |
218 | if (!ie) | |
219 | return false; | |
220 | if (ie[1] != IEEE80211_MESH_CONFIG_LEN) | |
221 | return false; | |
222 | ||
223 | /* | |
224 | * Ignore mesh capability (last two bytes of the IE) when | |
225 | * comparing since that may differ between stations taking | |
226 | * part in the same mesh. | |
227 | */ | |
228 | return memcmp(ie + 2, meshcfg, IEEE80211_MESH_CONFIG_LEN - 2) == 0; | |
229 | } | |
230 | ||
231 | static int cmp_bss(struct cfg80211_bss *a, | |
232 | struct cfg80211_bss *b) | |
233 | { | |
234 | int r; | |
235 | ||
236 | if (a->channel != b->channel) | |
237 | return b->channel->center_freq - a->channel->center_freq; | |
238 | ||
239 | r = memcmp(a->bssid, b->bssid, ETH_ALEN); | |
240 | if (r) | |
241 | return r; | |
242 | ||
243 | if (is_zero_ether_addr(a->bssid)) { | |
244 | r = cmp_ies(WLAN_EID_MESH_ID, | |
245 | a->information_elements, | |
246 | a->len_information_elements, | |
247 | b->information_elements, | |
248 | b->len_information_elements); | |
249 | if (r) | |
250 | return r; | |
251 | return cmp_ies(WLAN_EID_MESH_CONFIG, | |
252 | a->information_elements, | |
253 | a->len_information_elements, | |
254 | b->information_elements, | |
255 | b->len_information_elements); | |
256 | } | |
257 | ||
258 | return cmp_ies(WLAN_EID_SSID, | |
259 | a->information_elements, | |
260 | a->len_information_elements, | |
261 | b->information_elements, | |
262 | b->len_information_elements); | |
263 | } | |
264 | ||
265 | struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, | |
266 | struct ieee80211_channel *channel, | |
267 | const u8 *bssid, | |
268 | const u8 *ssid, size_t ssid_len, | |
269 | u16 capa_mask, u16 capa_val) | |
270 | { | |
271 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
272 | struct cfg80211_internal_bss *bss, *res = NULL; | |
273 | ||
274 | spin_lock_bh(&dev->bss_lock); | |
275 | ||
276 | list_for_each_entry(bss, &dev->bss_list, list) { | |
277 | if ((bss->pub.capability & capa_mask) != capa_val) | |
278 | continue; | |
279 | if (channel && bss->pub.channel != channel) | |
280 | continue; | |
281 | if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { | |
282 | res = bss; | |
283 | kref_get(&res->ref); | |
284 | break; | |
285 | } | |
286 | } | |
287 | ||
288 | spin_unlock_bh(&dev->bss_lock); | |
289 | if (!res) | |
290 | return NULL; | |
291 | return &res->pub; | |
292 | } | |
293 | EXPORT_SYMBOL(cfg80211_get_bss); | |
294 | ||
295 | struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy, | |
296 | struct ieee80211_channel *channel, | |
297 | const u8 *meshid, size_t meshidlen, | |
298 | const u8 *meshcfg) | |
299 | { | |
300 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
301 | struct cfg80211_internal_bss *bss, *res = NULL; | |
302 | ||
303 | spin_lock_bh(&dev->bss_lock); | |
304 | ||
305 | list_for_each_entry(bss, &dev->bss_list, list) { | |
306 | if (channel && bss->pub.channel != channel) | |
307 | continue; | |
308 | if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) { | |
309 | res = bss; | |
310 | kref_get(&res->ref); | |
311 | break; | |
312 | } | |
313 | } | |
314 | ||
315 | spin_unlock_bh(&dev->bss_lock); | |
316 | if (!res) | |
317 | return NULL; | |
318 | return &res->pub; | |
319 | } | |
320 | EXPORT_SYMBOL(cfg80211_get_mesh); | |
321 | ||
322 | ||
323 | static void rb_insert_bss(struct cfg80211_registered_device *dev, | |
324 | struct cfg80211_internal_bss *bss) | |
325 | { | |
326 | struct rb_node **p = &dev->bss_tree.rb_node; | |
327 | struct rb_node *parent = NULL; | |
328 | struct cfg80211_internal_bss *tbss; | |
329 | int cmp; | |
330 | ||
331 | while (*p) { | |
332 | parent = *p; | |
333 | tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); | |
334 | ||
335 | cmp = cmp_bss(&bss->pub, &tbss->pub); | |
336 | ||
337 | if (WARN_ON(!cmp)) { | |
338 | /* will sort of leak this BSS */ | |
339 | return; | |
340 | } | |
341 | ||
342 | if (cmp < 0) | |
343 | p = &(*p)->rb_left; | |
344 | else | |
345 | p = &(*p)->rb_right; | |
346 | } | |
347 | ||
348 | rb_link_node(&bss->rbn, parent, p); | |
349 | rb_insert_color(&bss->rbn, &dev->bss_tree); | |
350 | } | |
351 | ||
352 | static struct cfg80211_internal_bss * | |
353 | rb_find_bss(struct cfg80211_registered_device *dev, | |
354 | struct cfg80211_internal_bss *res) | |
355 | { | |
356 | struct rb_node *n = dev->bss_tree.rb_node; | |
357 | struct cfg80211_internal_bss *bss; | |
358 | int r; | |
359 | ||
360 | while (n) { | |
361 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); | |
362 | r = cmp_bss(&res->pub, &bss->pub); | |
363 | ||
364 | if (r == 0) | |
365 | return bss; | |
366 | else if (r < 0) | |
367 | n = n->rb_left; | |
368 | else | |
369 | n = n->rb_right; | |
370 | } | |
371 | ||
372 | return NULL; | |
373 | } | |
374 | ||
375 | static struct cfg80211_internal_bss * | |
376 | cfg80211_bss_update(struct cfg80211_registered_device *dev, | |
377 | struct cfg80211_internal_bss *res, | |
378 | bool overwrite) | |
379 | { | |
380 | struct cfg80211_internal_bss *found = NULL; | |
381 | const u8 *meshid, *meshcfg; | |
382 | ||
383 | /* | |
384 | * The reference to "res" is donated to this function. | |
385 | */ | |
386 | ||
387 | if (WARN_ON(!res->pub.channel)) { | |
388 | kref_put(&res->ref, bss_release); | |
389 | return NULL; | |
390 | } | |
391 | ||
392 | res->ts = jiffies; | |
393 | ||
394 | if (is_zero_ether_addr(res->pub.bssid)) { | |
395 | /* must be mesh, verify */ | |
396 | meshid = find_ie(WLAN_EID_MESH_ID, res->pub.information_elements, | |
397 | res->pub.len_information_elements); | |
398 | meshcfg = find_ie(WLAN_EID_MESH_CONFIG, | |
399 | res->pub.information_elements, | |
400 | res->pub.len_information_elements); | |
401 | if (!meshid || !meshcfg || | |
402 | meshcfg[1] != IEEE80211_MESH_CONFIG_LEN) { | |
403 | /* bogus mesh */ | |
404 | kref_put(&res->ref, bss_release); | |
405 | return NULL; | |
406 | } | |
407 | } | |
408 | ||
409 | spin_lock_bh(&dev->bss_lock); | |
410 | ||
411 | found = rb_find_bss(dev, res); | |
412 | ||
413 | if (found) { | |
414 | found->pub.beacon_interval = res->pub.beacon_interval; | |
415 | found->pub.tsf = res->pub.tsf; | |
416 | found->pub.signal = res->pub.signal; | |
417 | found->pub.capability = res->pub.capability; | |
418 | found->ts = res->ts; | |
419 | ||
420 | /* overwrite IEs */ | |
421 | if (overwrite) { | |
422 | size_t used = dev->wiphy.bss_priv_size + sizeof(*res); | |
423 | size_t ielen = res->pub.len_information_elements; | |
424 | ||
425 | if (!found->ies_allocated && ksize(found) >= used + ielen) { | |
426 | memcpy(found->pub.information_elements, | |
427 | res->pub.information_elements, ielen); | |
428 | found->pub.len_information_elements = ielen; | |
429 | } else { | |
430 | u8 *ies = found->pub.information_elements; | |
431 | ||
432 | if (found->ies_allocated) | |
433 | ies = krealloc(ies, ielen, GFP_ATOMIC); | |
434 | else | |
435 | ies = kmalloc(ielen, GFP_ATOMIC); | |
436 | ||
437 | if (ies) { | |
438 | memcpy(ies, res->pub.information_elements, ielen); | |
439 | found->ies_allocated = true; | |
440 | found->pub.information_elements = ies; | |
441 | found->pub.len_information_elements = ielen; | |
442 | } | |
443 | } | |
444 | } | |
445 | ||
446 | kref_put(&res->ref, bss_release); | |
447 | } else { | |
448 | /* this "consumes" the reference */ | |
449 | list_add_tail(&res->list, &dev->bss_list); | |
450 | rb_insert_bss(dev, res); | |
451 | found = res; | |
452 | } | |
453 | ||
454 | dev->bss_generation++; | |
455 | spin_unlock_bh(&dev->bss_lock); | |
456 | ||
457 | kref_get(&found->ref); | |
458 | return found; | |
459 | } | |
460 | ||
461 | struct cfg80211_bss* | |
462 | cfg80211_inform_bss(struct wiphy *wiphy, | |
463 | struct ieee80211_channel *channel, | |
464 | const u8 *bssid, | |
465 | u64 timestamp, u16 capability, u16 beacon_interval, | |
466 | const u8 *ie, size_t ielen, | |
467 | s32 signal, gfp_t gfp) | |
468 | { | |
469 | struct cfg80211_internal_bss *res; | |
470 | size_t privsz; | |
471 | ||
472 | if (WARN_ON(!wiphy)) | |
473 | return NULL; | |
474 | ||
475 | privsz = wiphy->bss_priv_size; | |
476 | ||
477 | if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC && | |
478 | (signal < 0 || signal > 100))) | |
479 | return NULL; | |
480 | ||
481 | res = kzalloc(sizeof(*res) + privsz + ielen, gfp); | |
482 | if (!res) | |
483 | return NULL; | |
484 | ||
485 | memcpy(res->pub.bssid, bssid, ETH_ALEN); | |
486 | res->pub.channel = channel; | |
487 | res->pub.signal = signal; | |
488 | res->pub.tsf = timestamp; | |
489 | res->pub.beacon_interval = beacon_interval; | |
490 | res->pub.capability = capability; | |
491 | /* point to after the private area */ | |
492 | res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz; | |
493 | memcpy(res->pub.information_elements, ie, ielen); | |
494 | res->pub.len_information_elements = ielen; | |
495 | ||
496 | kref_init(&res->ref); | |
497 | ||
498 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, 0); | |
499 | if (!res) | |
500 | return NULL; | |
501 | ||
502 | if (res->pub.capability & WLAN_CAPABILITY_ESS) | |
503 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
504 | ||
505 | /* cfg80211_bss_update gives us a referenced result */ | |
506 | return &res->pub; | |
507 | } | |
508 | EXPORT_SYMBOL(cfg80211_inform_bss); | |
509 | ||
510 | struct cfg80211_bss * | |
511 | cfg80211_inform_bss_frame(struct wiphy *wiphy, | |
512 | struct ieee80211_channel *channel, | |
513 | struct ieee80211_mgmt *mgmt, size_t len, | |
514 | s32 signal, gfp_t gfp) | |
515 | { | |
516 | struct cfg80211_internal_bss *res; | |
517 | size_t ielen = len - offsetof(struct ieee80211_mgmt, | |
518 | u.probe_resp.variable); | |
519 | bool overwrite; | |
520 | size_t privsz = wiphy->bss_priv_size; | |
521 | ||
522 | if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC && | |
523 | (signal < 0 || signal > 100))) | |
524 | return NULL; | |
525 | ||
526 | if (WARN_ON(!mgmt || !wiphy || | |
527 | len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) | |
528 | return NULL; | |
529 | ||
530 | res = kzalloc(sizeof(*res) + privsz + ielen, gfp); | |
531 | if (!res) | |
532 | return NULL; | |
533 | ||
534 | memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN); | |
535 | res->pub.channel = channel; | |
536 | res->pub.signal = signal; | |
537 | res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); | |
538 | res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); | |
539 | res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); | |
540 | /* point to after the private area */ | |
541 | res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz; | |
542 | memcpy(res->pub.information_elements, mgmt->u.probe_resp.variable, ielen); | |
543 | res->pub.len_information_elements = ielen; | |
544 | ||
545 | kref_init(&res->ref); | |
546 | ||
547 | overwrite = ieee80211_is_probe_resp(mgmt->frame_control); | |
548 | ||
549 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, overwrite); | |
550 | if (!res) | |
551 | return NULL; | |
552 | ||
553 | if (res->pub.capability & WLAN_CAPABILITY_ESS) | |
554 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
555 | ||
556 | /* cfg80211_bss_update gives us a referenced result */ | |
557 | return &res->pub; | |
558 | } | |
559 | EXPORT_SYMBOL(cfg80211_inform_bss_frame); | |
560 | ||
561 | void cfg80211_put_bss(struct cfg80211_bss *pub) | |
562 | { | |
563 | struct cfg80211_internal_bss *bss; | |
564 | ||
565 | if (!pub) | |
566 | return; | |
567 | ||
568 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
569 | kref_put(&bss->ref, bss_release); | |
570 | } | |
571 | EXPORT_SYMBOL(cfg80211_put_bss); | |
572 | ||
573 | void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) | |
574 | { | |
575 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
576 | struct cfg80211_internal_bss *bss; | |
577 | ||
578 | if (WARN_ON(!pub)) | |
579 | return; | |
580 | ||
581 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
582 | ||
583 | spin_lock_bh(&dev->bss_lock); | |
584 | ||
585 | list_del(&bss->list); | |
586 | dev->bss_generation++; | |
587 | rb_erase(&bss->rbn, &dev->bss_tree); | |
588 | ||
589 | spin_unlock_bh(&dev->bss_lock); | |
590 | ||
591 | kref_put(&bss->ref, bss_release); | |
592 | } | |
593 | EXPORT_SYMBOL(cfg80211_unlink_bss); | |
594 | ||
595 | #ifdef CONFIG_WIRELESS_EXT | |
596 | int cfg80211_wext_siwscan(struct net_device *dev, | |
597 | struct iw_request_info *info, | |
598 | union iwreq_data *wrqu, char *extra) | |
599 | { | |
600 | struct cfg80211_registered_device *rdev; | |
601 | struct wiphy *wiphy; | |
602 | struct iw_scan_req *wreq = NULL; | |
603 | struct cfg80211_scan_request *creq; | |
604 | int i, err, n_channels = 0; | |
605 | enum ieee80211_band band; | |
606 | ||
607 | if (!netif_running(dev)) | |
608 | return -ENETDOWN; | |
609 | ||
610 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); | |
611 | ||
612 | if (IS_ERR(rdev)) | |
613 | return PTR_ERR(rdev); | |
614 | ||
615 | if (rdev->scan_req) { | |
616 | err = -EBUSY; | |
617 | goto out; | |
618 | } | |
619 | ||
620 | wiphy = &rdev->wiphy; | |
621 | ||
622 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) | |
623 | if (wiphy->bands[band]) | |
624 | n_channels += wiphy->bands[band]->n_channels; | |
625 | ||
626 | creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + | |
627 | n_channels * sizeof(void *), | |
628 | GFP_ATOMIC); | |
629 | if (!creq) { | |
630 | err = -ENOMEM; | |
631 | goto out; | |
632 | } | |
633 | ||
634 | creq->wiphy = wiphy; | |
635 | creq->dev = dev; | |
636 | /* SSIDs come after channels */ | |
637 | creq->ssids = (void *)&creq->channels[n_channels]; | |
638 | creq->n_channels = n_channels; | |
639 | creq->n_ssids = 1; | |
640 | ||
641 | /* all channels */ | |
642 | i = 0; | |
643 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
644 | int j; | |
645 | if (!wiphy->bands[band]) | |
646 | continue; | |
647 | for (j = 0; j < wiphy->bands[band]->n_channels; j++) { | |
648 | creq->channels[i] = &wiphy->bands[band]->channels[j]; | |
649 | i++; | |
650 | } | |
651 | } | |
652 | ||
653 | /* translate scan request */ | |
654 | if (wrqu->data.length == sizeof(struct iw_scan_req)) { | |
655 | wreq = (struct iw_scan_req *)extra; | |
656 | ||
657 | if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { | |
658 | if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) | |
659 | return -EINVAL; | |
660 | memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); | |
661 | creq->ssids[0].ssid_len = wreq->essid_len; | |
662 | } | |
663 | if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) | |
664 | creq->n_ssids = 0; | |
665 | } | |
666 | ||
667 | rdev->scan_req = creq; | |
668 | err = rdev->ops->scan(wiphy, dev, creq); | |
669 | if (err) { | |
670 | rdev->scan_req = NULL; | |
671 | kfree(creq); | |
672 | } else { | |
673 | nl80211_send_scan_start(rdev, dev); | |
674 | dev_hold(dev); | |
675 | } | |
676 | out: | |
677 | cfg80211_unlock_rdev(rdev); | |
678 | return err; | |
679 | } | |
680 | EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan); | |
681 | ||
682 | static void ieee80211_scan_add_ies(struct iw_request_info *info, | |
683 | struct cfg80211_bss *bss, | |
684 | char **current_ev, char *end_buf) | |
685 | { | |
686 | u8 *pos, *end, *next; | |
687 | struct iw_event iwe; | |
688 | ||
689 | if (!bss->information_elements || | |
690 | !bss->len_information_elements) | |
691 | return; | |
692 | ||
693 | /* | |
694 | * If needed, fragment the IEs buffer (at IE boundaries) into short | |
695 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. | |
696 | */ | |
697 | pos = bss->information_elements; | |
698 | end = pos + bss->len_information_elements; | |
699 | ||
700 | while (end - pos > IW_GENERIC_IE_MAX) { | |
701 | next = pos + 2 + pos[1]; | |
702 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) | |
703 | next = next + 2 + next[1]; | |
704 | ||
705 | memset(&iwe, 0, sizeof(iwe)); | |
706 | iwe.cmd = IWEVGENIE; | |
707 | iwe.u.data.length = next - pos; | |
708 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
709 | end_buf, &iwe, pos); | |
710 | ||
711 | pos = next; | |
712 | } | |
713 | ||
714 | if (end > pos) { | |
715 | memset(&iwe, 0, sizeof(iwe)); | |
716 | iwe.cmd = IWEVGENIE; | |
717 | iwe.u.data.length = end - pos; | |
718 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
719 | end_buf, &iwe, pos); | |
720 | } | |
721 | } | |
722 | ||
723 | static inline unsigned int elapsed_jiffies_msecs(unsigned long start) | |
724 | { | |
725 | unsigned long end = jiffies; | |
726 | ||
727 | if (end >= start) | |
728 | return jiffies_to_msecs(end - start); | |
729 | ||
730 | return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1); | |
731 | } | |
732 | ||
733 | static char * | |
734 | ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, | |
735 | struct cfg80211_internal_bss *bss, char *current_ev, | |
736 | char *end_buf) | |
737 | { | |
738 | struct iw_event iwe; | |
739 | u8 *buf, *cfg, *p; | |
740 | u8 *ie = bss->pub.information_elements; | |
741 | int rem = bss->pub.len_information_elements, i, sig; | |
742 | bool ismesh = false; | |
743 | ||
744 | memset(&iwe, 0, sizeof(iwe)); | |
745 | iwe.cmd = SIOCGIWAP; | |
746 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; | |
747 | memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); | |
748 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
749 | IW_EV_ADDR_LEN); | |
750 | ||
751 | memset(&iwe, 0, sizeof(iwe)); | |
752 | iwe.cmd = SIOCGIWFREQ; | |
753 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); | |
754 | iwe.u.freq.e = 0; | |
755 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
756 | IW_EV_FREQ_LEN); | |
757 | ||
758 | memset(&iwe, 0, sizeof(iwe)); | |
759 | iwe.cmd = SIOCGIWFREQ; | |
760 | iwe.u.freq.m = bss->pub.channel->center_freq; | |
761 | iwe.u.freq.e = 6; | |
762 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
763 | IW_EV_FREQ_LEN); | |
764 | ||
765 | if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { | |
766 | memset(&iwe, 0, sizeof(iwe)); | |
767 | iwe.cmd = IWEVQUAL; | |
768 | iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | | |
769 | IW_QUAL_NOISE_INVALID | | |
770 | IW_QUAL_QUAL_UPDATED; | |
771 | switch (wiphy->signal_type) { | |
772 | case CFG80211_SIGNAL_TYPE_MBM: | |
773 | sig = bss->pub.signal / 100; | |
774 | iwe.u.qual.level = sig; | |
775 | iwe.u.qual.updated |= IW_QUAL_DBM; | |
776 | if (sig < -110) /* rather bad */ | |
777 | sig = -110; | |
778 | else if (sig > -40) /* perfect */ | |
779 | sig = -40; | |
780 | /* will give a range of 0 .. 70 */ | |
781 | iwe.u.qual.qual = sig + 110; | |
782 | break; | |
783 | case CFG80211_SIGNAL_TYPE_UNSPEC: | |
784 | iwe.u.qual.level = bss->pub.signal; | |
785 | /* will give range 0 .. 100 */ | |
786 | iwe.u.qual.qual = bss->pub.signal; | |
787 | break; | |
788 | default: | |
789 | /* not reached */ | |
790 | break; | |
791 | } | |
792 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
793 | &iwe, IW_EV_QUAL_LEN); | |
794 | } | |
795 | ||
796 | memset(&iwe, 0, sizeof(iwe)); | |
797 | iwe.cmd = SIOCGIWENCODE; | |
798 | if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) | |
799 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; | |
800 | else | |
801 | iwe.u.data.flags = IW_ENCODE_DISABLED; | |
802 | iwe.u.data.length = 0; | |
803 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
804 | &iwe, ""); | |
805 | ||
806 | while (rem >= 2) { | |
807 | /* invalid data */ | |
808 | if (ie[1] > rem - 2) | |
809 | break; | |
810 | ||
811 | switch (ie[0]) { | |
812 | case WLAN_EID_SSID: | |
813 | memset(&iwe, 0, sizeof(iwe)); | |
814 | iwe.cmd = SIOCGIWESSID; | |
815 | iwe.u.data.length = ie[1]; | |
816 | iwe.u.data.flags = 1; | |
817 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
818 | &iwe, ie + 2); | |
819 | break; | |
820 | case WLAN_EID_MESH_ID: | |
821 | memset(&iwe, 0, sizeof(iwe)); | |
822 | iwe.cmd = SIOCGIWESSID; | |
823 | iwe.u.data.length = ie[1]; | |
824 | iwe.u.data.flags = 1; | |
825 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
826 | &iwe, ie + 2); | |
827 | break; | |
828 | case WLAN_EID_MESH_CONFIG: | |
829 | ismesh = true; | |
830 | if (ie[1] != IEEE80211_MESH_CONFIG_LEN) | |
831 | break; | |
832 | buf = kmalloc(50, GFP_ATOMIC); | |
833 | if (!buf) | |
834 | break; | |
835 | cfg = ie + 2; | |
836 | memset(&iwe, 0, sizeof(iwe)); | |
837 | iwe.cmd = IWEVCUSTOM; | |
838 | sprintf(buf, "Mesh network (version %d)", cfg[0]); | |
839 | iwe.u.data.length = strlen(buf); | |
840 | current_ev = iwe_stream_add_point(info, current_ev, | |
841 | end_buf, | |
842 | &iwe, buf); | |
843 | sprintf(buf, "Path Selection Protocol ID: " | |
844 | "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3], | |
845 | cfg[4]); | |
846 | iwe.u.data.length = strlen(buf); | |
847 | current_ev = iwe_stream_add_point(info, current_ev, | |
848 | end_buf, | |
849 | &iwe, buf); | |
850 | sprintf(buf, "Path Selection Metric ID: " | |
851 | "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7], | |
852 | cfg[8]); | |
853 | iwe.u.data.length = strlen(buf); | |
854 | current_ev = iwe_stream_add_point(info, current_ev, | |
855 | end_buf, | |
856 | &iwe, buf); | |
857 | sprintf(buf, "Congestion Control Mode ID: " | |
858 | "0x%02X%02X%02X%02X", cfg[9], cfg[10], | |
859 | cfg[11], cfg[12]); | |
860 | iwe.u.data.length = strlen(buf); | |
861 | current_ev = iwe_stream_add_point(info, current_ev, | |
862 | end_buf, | |
863 | &iwe, buf); | |
864 | sprintf(buf, "Channel Precedence: " | |
865 | "0x%02X%02X%02X%02X", cfg[13], cfg[14], | |
866 | cfg[15], cfg[16]); | |
867 | iwe.u.data.length = strlen(buf); | |
868 | current_ev = iwe_stream_add_point(info, current_ev, | |
869 | end_buf, | |
870 | &iwe, buf); | |
871 | kfree(buf); | |
872 | break; | |
873 | case WLAN_EID_SUPP_RATES: | |
874 | case WLAN_EID_EXT_SUPP_RATES: | |
875 | /* display all supported rates in readable format */ | |
876 | p = current_ev + iwe_stream_lcp_len(info); | |
877 | ||
878 | memset(&iwe, 0, sizeof(iwe)); | |
879 | iwe.cmd = SIOCGIWRATE; | |
880 | /* Those two flags are ignored... */ | |
881 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; | |
882 | ||
883 | for (i = 0; i < ie[1]; i++) { | |
884 | iwe.u.bitrate.value = | |
885 | ((ie[i + 2] & 0x7f) * 500000); | |
886 | p = iwe_stream_add_value(info, current_ev, p, | |
887 | end_buf, &iwe, IW_EV_PARAM_LEN); | |
888 | } | |
889 | current_ev = p; | |
890 | break; | |
891 | } | |
892 | rem -= ie[1] + 2; | |
893 | ie += ie[1] + 2; | |
894 | } | |
895 | ||
896 | if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) | |
897 | || ismesh) { | |
898 | memset(&iwe, 0, sizeof(iwe)); | |
899 | iwe.cmd = SIOCGIWMODE; | |
900 | if (ismesh) | |
901 | iwe.u.mode = IW_MODE_MESH; | |
902 | else if (bss->pub.capability & WLAN_CAPABILITY_ESS) | |
903 | iwe.u.mode = IW_MODE_MASTER; | |
904 | else | |
905 | iwe.u.mode = IW_MODE_ADHOC; | |
906 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
907 | &iwe, IW_EV_UINT_LEN); | |
908 | } | |
909 | ||
910 | buf = kmalloc(30, GFP_ATOMIC); | |
911 | if (buf) { | |
912 | memset(&iwe, 0, sizeof(iwe)); | |
913 | iwe.cmd = IWEVCUSTOM; | |
914 | sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf)); | |
915 | iwe.u.data.length = strlen(buf); | |
916 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
917 | &iwe, buf); | |
918 | memset(&iwe, 0, sizeof(iwe)); | |
919 | iwe.cmd = IWEVCUSTOM; | |
920 | sprintf(buf, " Last beacon: %ums ago", | |
921 | elapsed_jiffies_msecs(bss->ts)); | |
922 | iwe.u.data.length = strlen(buf); | |
923 | current_ev = iwe_stream_add_point(info, current_ev, | |
924 | end_buf, &iwe, buf); | |
925 | kfree(buf); | |
926 | } | |
927 | ||
928 | ieee80211_scan_add_ies(info, &bss->pub, ¤t_ev, end_buf); | |
929 | ||
930 | return current_ev; | |
931 | } | |
932 | ||
933 | ||
934 | static int ieee80211_scan_results(struct cfg80211_registered_device *dev, | |
935 | struct iw_request_info *info, | |
936 | char *buf, size_t len) | |
937 | { | |
938 | char *current_ev = buf; | |
939 | char *end_buf = buf + len; | |
940 | struct cfg80211_internal_bss *bss; | |
941 | ||
942 | spin_lock_bh(&dev->bss_lock); | |
943 | cfg80211_bss_expire(dev); | |
944 | ||
945 | list_for_each_entry(bss, &dev->bss_list, list) { | |
946 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { | |
947 | spin_unlock_bh(&dev->bss_lock); | |
948 | return -E2BIG; | |
949 | } | |
950 | current_ev = ieee80211_bss(&dev->wiphy, info, bss, | |
951 | current_ev, end_buf); | |
952 | } | |
953 | spin_unlock_bh(&dev->bss_lock); | |
954 | return current_ev - buf; | |
955 | } | |
956 | ||
957 | ||
958 | int cfg80211_wext_giwscan(struct net_device *dev, | |
959 | struct iw_request_info *info, | |
960 | struct iw_point *data, char *extra) | |
961 | { | |
962 | struct cfg80211_registered_device *rdev; | |
963 | int res; | |
964 | ||
965 | if (!netif_running(dev)) | |
966 | return -ENETDOWN; | |
967 | ||
968 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); | |
969 | ||
970 | if (IS_ERR(rdev)) | |
971 | return PTR_ERR(rdev); | |
972 | ||
973 | if (rdev->scan_req) { | |
974 | res = -EAGAIN; | |
975 | goto out; | |
976 | } | |
977 | ||
978 | res = ieee80211_scan_results(rdev, info, extra, data->length); | |
979 | data->length = 0; | |
980 | if (res >= 0) { | |
981 | data->length = res; | |
982 | res = 0; | |
983 | } | |
984 | ||
985 | out: | |
986 | cfg80211_unlock_rdev(rdev); | |
987 | return res; | |
988 | } | |
989 | EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan); | |
990 | #endif |