Commit | Line | Data |
---|---|---|
2a519311 JB |
1 | /* |
2 | * cfg80211 scan result handling | |
3 | * | |
4 | * Copyright 2008 Johannes Berg <johannes@sipsolutions.net> | |
5 | */ | |
6 | #include <linux/kernel.h> | |
7 | #include <linux/module.h> | |
8 | #include <linux/netdevice.h> | |
9 | #include <linux/wireless.h> | |
10 | #include <linux/nl80211.h> | |
11 | #include <linux/etherdevice.h> | |
12 | #include <net/arp.h> | |
13 | #include <net/cfg80211.h> | |
14 | #include <net/iw_handler.h> | |
15 | #include "core.h" | |
16 | #include "nl80211.h" | |
a9a11622 | 17 | #include "wext-compat.h" |
2a519311 | 18 | |
09f97e0f | 19 | #define IEEE80211_SCAN_RESULT_EXPIRE (15 * HZ) |
2a519311 | 20 | |
01a0ac41 | 21 | void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak) |
2a519311 | 22 | { |
667503dd | 23 | struct cfg80211_scan_request *request; |
2a519311 | 24 | struct net_device *dev; |
3d23e349 | 25 | #ifdef CONFIG_CFG80211_WEXT |
2a519311 JB |
26 | union iwreq_data wrqu; |
27 | #endif | |
28 | ||
01a0ac41 JB |
29 | ASSERT_RDEV_LOCK(rdev); |
30 | ||
667503dd JB |
31 | request = rdev->scan_req; |
32 | ||
01a0ac41 JB |
33 | if (!request) |
34 | return; | |
35 | ||
463d0183 | 36 | dev = request->dev; |
2a519311 | 37 | |
6829c878 JB |
38 | /* |
39 | * This must be before sending the other events! | |
40 | * Otherwise, wpa_supplicant gets completely confused with | |
41 | * wext events. | |
42 | */ | |
43 | cfg80211_sme_scan_done(dev); | |
44 | ||
667503dd | 45 | if (request->aborted) |
36e6fea8 | 46 | nl80211_send_scan_aborted(rdev, dev); |
2a519311 | 47 | else |
36e6fea8 | 48 | nl80211_send_scan_done(rdev, dev); |
2a519311 | 49 | |
3d23e349 | 50 | #ifdef CONFIG_CFG80211_WEXT |
667503dd | 51 | if (!request->aborted) { |
2a519311 JB |
52 | memset(&wrqu, 0, sizeof(wrqu)); |
53 | ||
54 | wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL); | |
55 | } | |
56 | #endif | |
57 | ||
58 | dev_put(dev); | |
59 | ||
36e6fea8 | 60 | rdev->scan_req = NULL; |
01a0ac41 JB |
61 | |
62 | /* | |
63 | * OK. If this is invoked with "leak" then we can't | |
64 | * free this ... but we've cleaned it up anyway. The | |
65 | * driver failed to call the scan_done callback, so | |
66 | * all bets are off, it might still be trying to use | |
67 | * the scan request or not ... if it accesses the dev | |
68 | * in there (it shouldn't anyway) then it may crash. | |
69 | */ | |
70 | if (!leak) | |
71 | kfree(request); | |
2a519311 | 72 | } |
667503dd | 73 | |
36e6fea8 JB |
74 | void __cfg80211_scan_done(struct work_struct *wk) |
75 | { | |
76 | struct cfg80211_registered_device *rdev; | |
77 | ||
78 | rdev = container_of(wk, struct cfg80211_registered_device, | |
79 | scan_done_wk); | |
80 | ||
81 | cfg80211_lock_rdev(rdev); | |
01a0ac41 | 82 | ___cfg80211_scan_done(rdev, false); |
36e6fea8 JB |
83 | cfg80211_unlock_rdev(rdev); |
84 | } | |
85 | ||
667503dd JB |
86 | void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted) |
87 | { | |
667503dd JB |
88 | WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req); |
89 | ||
90 | request->aborted = aborted; | |
e60d7443 | 91 | queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk); |
667503dd | 92 | } |
2a519311 JB |
93 | EXPORT_SYMBOL(cfg80211_scan_done); |
94 | ||
95 | static void bss_release(struct kref *ref) | |
96 | { | |
97 | struct cfg80211_internal_bss *bss; | |
98 | ||
99 | bss = container_of(ref, struct cfg80211_internal_bss, ref); | |
78c1c7e1 JB |
100 | if (bss->pub.free_priv) |
101 | bss->pub.free_priv(&bss->pub); | |
cd1658f5 JB |
102 | |
103 | if (bss->ies_allocated) | |
104 | kfree(bss->pub.information_elements); | |
105 | ||
19957bb3 JB |
106 | BUG_ON(atomic_read(&bss->hold)); |
107 | ||
2a519311 JB |
108 | kfree(bss); |
109 | } | |
110 | ||
cb3a8eec DW |
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 | ||
2a519311 JB |
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) { | |
19957bb3 JB |
130 | if (atomic_read(&bss->hold)) |
131 | continue; | |
132 | if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE)) | |
2a519311 JB |
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 | ||
fcc6cb0c | 144 | static u8 *find_ie(u8 num, u8 *ies, int len) |
2a519311 JB |
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; | |
cd3468ba | 165 | if (!ie1 || !ie2) |
2a519311 JB |
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 | ||
79420f09 | 180 | if (bssid && compare_ether_addr(a->bssid, bssid)) |
2a519311 JB |
181 | return false; |
182 | ||
79420f09 JB |
183 | if (!ssid) |
184 | return true; | |
185 | ||
2a519311 JB |
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); | |
cd3468ba JB |
218 | if (!ie) |
219 | return false; | |
136cfa28 | 220 | if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) |
2a519311 JB |
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 | */ | |
136cfa28 RP |
228 | return memcmp(ie + 2, meshcfg, |
229 | sizeof(struct ieee80211_meshconf_ie) - 2) == 0; | |
2a519311 JB |
230 | } |
231 | ||
232 | static int cmp_bss(struct cfg80211_bss *a, | |
233 | struct cfg80211_bss *b) | |
234 | { | |
235 | int r; | |
236 | ||
237 | if (a->channel != b->channel) | |
238 | return b->channel->center_freq - a->channel->center_freq; | |
239 | ||
240 | r = memcmp(a->bssid, b->bssid, ETH_ALEN); | |
241 | if (r) | |
242 | return r; | |
243 | ||
244 | if (is_zero_ether_addr(a->bssid)) { | |
245 | r = cmp_ies(WLAN_EID_MESH_ID, | |
246 | a->information_elements, | |
247 | a->len_information_elements, | |
248 | b->information_elements, | |
249 | b->len_information_elements); | |
250 | if (r) | |
251 | return r; | |
252 | return cmp_ies(WLAN_EID_MESH_CONFIG, | |
253 | a->information_elements, | |
254 | a->len_information_elements, | |
255 | b->information_elements, | |
256 | b->len_information_elements); | |
257 | } | |
258 | ||
259 | return cmp_ies(WLAN_EID_SSID, | |
260 | a->information_elements, | |
261 | a->len_information_elements, | |
262 | b->information_elements, | |
263 | b->len_information_elements); | |
264 | } | |
265 | ||
266 | struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, | |
267 | struct ieee80211_channel *channel, | |
268 | const u8 *bssid, | |
79420f09 JB |
269 | const u8 *ssid, size_t ssid_len, |
270 | u16 capa_mask, u16 capa_val) | |
2a519311 JB |
271 | { |
272 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
273 | struct cfg80211_internal_bss *bss, *res = NULL; | |
274 | ||
275 | spin_lock_bh(&dev->bss_lock); | |
276 | ||
277 | list_for_each_entry(bss, &dev->bss_list, list) { | |
79420f09 JB |
278 | if ((bss->pub.capability & capa_mask) != capa_val) |
279 | continue; | |
2a519311 JB |
280 | if (channel && bss->pub.channel != channel) |
281 | continue; | |
282 | if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { | |
283 | res = bss; | |
284 | kref_get(&res->ref); | |
285 | break; | |
286 | } | |
287 | } | |
288 | ||
289 | spin_unlock_bh(&dev->bss_lock); | |
290 | if (!res) | |
291 | return NULL; | |
292 | return &res->pub; | |
293 | } | |
294 | EXPORT_SYMBOL(cfg80211_get_bss); | |
295 | ||
296 | struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy, | |
297 | struct ieee80211_channel *channel, | |
298 | const u8 *meshid, size_t meshidlen, | |
299 | const u8 *meshcfg) | |
300 | { | |
301 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
302 | struct cfg80211_internal_bss *bss, *res = NULL; | |
303 | ||
304 | spin_lock_bh(&dev->bss_lock); | |
305 | ||
306 | list_for_each_entry(bss, &dev->bss_list, list) { | |
307 | if (channel && bss->pub.channel != channel) | |
308 | continue; | |
309 | if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) { | |
310 | res = bss; | |
311 | kref_get(&res->ref); | |
312 | break; | |
313 | } | |
314 | } | |
315 | ||
316 | spin_unlock_bh(&dev->bss_lock); | |
317 | if (!res) | |
318 | return NULL; | |
319 | return &res->pub; | |
320 | } | |
321 | EXPORT_SYMBOL(cfg80211_get_mesh); | |
322 | ||
323 | ||
324 | static void rb_insert_bss(struct cfg80211_registered_device *dev, | |
325 | struct cfg80211_internal_bss *bss) | |
326 | { | |
327 | struct rb_node **p = &dev->bss_tree.rb_node; | |
328 | struct rb_node *parent = NULL; | |
329 | struct cfg80211_internal_bss *tbss; | |
330 | int cmp; | |
331 | ||
332 | while (*p) { | |
333 | parent = *p; | |
334 | tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); | |
335 | ||
336 | cmp = cmp_bss(&bss->pub, &tbss->pub); | |
337 | ||
338 | if (WARN_ON(!cmp)) { | |
339 | /* will sort of leak this BSS */ | |
340 | return; | |
341 | } | |
342 | ||
343 | if (cmp < 0) | |
344 | p = &(*p)->rb_left; | |
345 | else | |
346 | p = &(*p)->rb_right; | |
347 | } | |
348 | ||
349 | rb_link_node(&bss->rbn, parent, p); | |
350 | rb_insert_color(&bss->rbn, &dev->bss_tree); | |
351 | } | |
352 | ||
353 | static struct cfg80211_internal_bss * | |
354 | rb_find_bss(struct cfg80211_registered_device *dev, | |
355 | struct cfg80211_internal_bss *res) | |
356 | { | |
357 | struct rb_node *n = dev->bss_tree.rb_node; | |
358 | struct cfg80211_internal_bss *bss; | |
359 | int r; | |
360 | ||
361 | while (n) { | |
362 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); | |
363 | r = cmp_bss(&res->pub, &bss->pub); | |
364 | ||
365 | if (r == 0) | |
366 | return bss; | |
367 | else if (r < 0) | |
368 | n = n->rb_left; | |
369 | else | |
370 | n = n->rb_right; | |
371 | } | |
372 | ||
373 | return NULL; | |
374 | } | |
375 | ||
376 | static struct cfg80211_internal_bss * | |
377 | cfg80211_bss_update(struct cfg80211_registered_device *dev, | |
378 | struct cfg80211_internal_bss *res, | |
379 | bool overwrite) | |
380 | { | |
381 | struct cfg80211_internal_bss *found = NULL; | |
382 | const u8 *meshid, *meshcfg; | |
383 | ||
384 | /* | |
385 | * The reference to "res" is donated to this function. | |
386 | */ | |
387 | ||
388 | if (WARN_ON(!res->pub.channel)) { | |
389 | kref_put(&res->ref, bss_release); | |
390 | return NULL; | |
391 | } | |
392 | ||
393 | res->ts = jiffies; | |
394 | ||
395 | if (is_zero_ether_addr(res->pub.bssid)) { | |
396 | /* must be mesh, verify */ | |
397 | meshid = find_ie(WLAN_EID_MESH_ID, res->pub.information_elements, | |
398 | res->pub.len_information_elements); | |
399 | meshcfg = find_ie(WLAN_EID_MESH_CONFIG, | |
400 | res->pub.information_elements, | |
401 | res->pub.len_information_elements); | |
402 | if (!meshid || !meshcfg || | |
136cfa28 | 403 | meshcfg[1] != sizeof(struct ieee80211_meshconf_ie)) { |
2a519311 JB |
404 | /* bogus mesh */ |
405 | kref_put(&res->ref, bss_release); | |
406 | return NULL; | |
407 | } | |
408 | } | |
409 | ||
410 | spin_lock_bh(&dev->bss_lock); | |
411 | ||
412 | found = rb_find_bss(dev, res); | |
413 | ||
cd1658f5 | 414 | if (found) { |
2a519311 JB |
415 | found->pub.beacon_interval = res->pub.beacon_interval; |
416 | found->pub.tsf = res->pub.tsf; | |
417 | found->pub.signal = res->pub.signal; | |
2a519311 JB |
418 | found->pub.capability = res->pub.capability; |
419 | found->ts = res->ts; | |
cd1658f5 JB |
420 | |
421 | /* overwrite IEs */ | |
422 | if (overwrite) { | |
423 | size_t used = dev->wiphy.bss_priv_size + sizeof(*res); | |
424 | size_t ielen = res->pub.len_information_elements; | |
425 | ||
44e1b98f | 426 | if (!found->ies_allocated && ksize(found) >= used + ielen) { |
cd1658f5 JB |
427 | memcpy(found->pub.information_elements, |
428 | res->pub.information_elements, ielen); | |
429 | found->pub.len_information_elements = ielen; | |
430 | } else { | |
431 | u8 *ies = found->pub.information_elements; | |
432 | ||
273de92c MB |
433 | if (found->ies_allocated) |
434 | ies = krealloc(ies, ielen, GFP_ATOMIC); | |
435 | else | |
cd1658f5 JB |
436 | ies = kmalloc(ielen, GFP_ATOMIC); |
437 | ||
438 | if (ies) { | |
439 | memcpy(ies, res->pub.information_elements, ielen); | |
440 | found->ies_allocated = true; | |
441 | found->pub.information_elements = ies; | |
c0f0aac0 | 442 | found->pub.len_information_elements = ielen; |
cd1658f5 JB |
443 | } |
444 | } | |
445 | } | |
446 | ||
2a519311 JB |
447 | kref_put(&res->ref, bss_release); |
448 | } else { | |
449 | /* this "consumes" the reference */ | |
450 | list_add_tail(&res->list, &dev->bss_list); | |
451 | rb_insert_bss(dev, res); | |
452 | found = res; | |
453 | } | |
454 | ||
455 | dev->bss_generation++; | |
456 | spin_unlock_bh(&dev->bss_lock); | |
457 | ||
458 | kref_get(&found->ref); | |
459 | return found; | |
460 | } | |
461 | ||
06aa7afa JK |
462 | struct cfg80211_bss* |
463 | cfg80211_inform_bss(struct wiphy *wiphy, | |
464 | struct ieee80211_channel *channel, | |
465 | const u8 *bssid, | |
466 | u64 timestamp, u16 capability, u16 beacon_interval, | |
467 | const u8 *ie, size_t ielen, | |
468 | s32 signal, gfp_t gfp) | |
469 | { | |
470 | struct cfg80211_internal_bss *res; | |
471 | size_t privsz; | |
472 | ||
473 | if (WARN_ON(!wiphy)) | |
474 | return NULL; | |
475 | ||
476 | privsz = wiphy->bss_priv_size; | |
477 | ||
478 | if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC && | |
479 | (signal < 0 || signal > 100))) | |
480 | return NULL; | |
481 | ||
482 | res = kzalloc(sizeof(*res) + privsz + ielen, gfp); | |
483 | if (!res) | |
484 | return NULL; | |
485 | ||
486 | memcpy(res->pub.bssid, bssid, ETH_ALEN); | |
487 | res->pub.channel = channel; | |
488 | res->pub.signal = signal; | |
489 | res->pub.tsf = timestamp; | |
490 | res->pub.beacon_interval = beacon_interval; | |
491 | res->pub.capability = capability; | |
492 | /* point to after the private area */ | |
493 | res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz; | |
494 | memcpy(res->pub.information_elements, ie, ielen); | |
495 | res->pub.len_information_elements = ielen; | |
496 | ||
497 | kref_init(&res->ref); | |
498 | ||
499 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, 0); | |
500 | if (!res) | |
501 | return NULL; | |
502 | ||
503 | if (res->pub.capability & WLAN_CAPABILITY_ESS) | |
504 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
505 | ||
506 | /* cfg80211_bss_update gives us a referenced result */ | |
507 | return &res->pub; | |
508 | } | |
509 | EXPORT_SYMBOL(cfg80211_inform_bss); | |
510 | ||
2a519311 JB |
511 | struct cfg80211_bss * |
512 | cfg80211_inform_bss_frame(struct wiphy *wiphy, | |
513 | struct ieee80211_channel *channel, | |
514 | struct ieee80211_mgmt *mgmt, size_t len, | |
77965c97 | 515 | s32 signal, gfp_t gfp) |
2a519311 JB |
516 | { |
517 | struct cfg80211_internal_bss *res; | |
518 | size_t ielen = len - offsetof(struct ieee80211_mgmt, | |
519 | u.probe_resp.variable); | |
520 | bool overwrite; | |
521 | size_t privsz = wiphy->bss_priv_size; | |
522 | ||
77965c97 | 523 | if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC && |
2a519311 JB |
524 | (signal < 0 || signal > 100))) |
525 | return NULL; | |
526 | ||
527 | if (WARN_ON(!mgmt || !wiphy || | |
528 | len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) | |
529 | return NULL; | |
530 | ||
531 | res = kzalloc(sizeof(*res) + privsz + ielen, gfp); | |
532 | if (!res) | |
533 | return NULL; | |
534 | ||
535 | memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN); | |
536 | res->pub.channel = channel; | |
2a519311 JB |
537 | res->pub.signal = signal; |
538 | res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); | |
539 | res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); | |
540 | res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); | |
541 | /* point to after the private area */ | |
542 | res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz; | |
543 | memcpy(res->pub.information_elements, mgmt->u.probe_resp.variable, ielen); | |
544 | res->pub.len_information_elements = ielen; | |
545 | ||
546 | kref_init(&res->ref); | |
547 | ||
548 | overwrite = ieee80211_is_probe_resp(mgmt->frame_control); | |
549 | ||
550 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, overwrite); | |
551 | if (!res) | |
552 | return NULL; | |
553 | ||
e38f8a7a LR |
554 | if (res->pub.capability & WLAN_CAPABILITY_ESS) |
555 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
556 | ||
2a519311 JB |
557 | /* cfg80211_bss_update gives us a referenced result */ |
558 | return &res->pub; | |
559 | } | |
560 | EXPORT_SYMBOL(cfg80211_inform_bss_frame); | |
561 | ||
562 | void cfg80211_put_bss(struct cfg80211_bss *pub) | |
563 | { | |
564 | struct cfg80211_internal_bss *bss; | |
565 | ||
566 | if (!pub) | |
567 | return; | |
568 | ||
569 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
570 | kref_put(&bss->ref, bss_release); | |
571 | } | |
572 | EXPORT_SYMBOL(cfg80211_put_bss); | |
573 | ||
d491af19 JB |
574 | void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
575 | { | |
576 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
577 | struct cfg80211_internal_bss *bss; | |
578 | ||
579 | if (WARN_ON(!pub)) | |
580 | return; | |
581 | ||
582 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
583 | ||
584 | spin_lock_bh(&dev->bss_lock); | |
585 | ||
586 | list_del(&bss->list); | |
f5ea9120 | 587 | dev->bss_generation++; |
d491af19 JB |
588 | rb_erase(&bss->rbn, &dev->bss_tree); |
589 | ||
590 | spin_unlock_bh(&dev->bss_lock); | |
591 | ||
592 | kref_put(&bss->ref, bss_release); | |
593 | } | |
594 | EXPORT_SYMBOL(cfg80211_unlink_bss); | |
595 | ||
3d23e349 | 596 | #ifdef CONFIG_CFG80211_WEXT |
2a519311 JB |
597 | int cfg80211_wext_siwscan(struct net_device *dev, |
598 | struct iw_request_info *info, | |
599 | union iwreq_data *wrqu, char *extra) | |
600 | { | |
601 | struct cfg80211_registered_device *rdev; | |
602 | struct wiphy *wiphy; | |
603 | struct iw_scan_req *wreq = NULL; | |
65486c8b | 604 | struct cfg80211_scan_request *creq = NULL; |
2a519311 JB |
605 | int i, err, n_channels = 0; |
606 | enum ieee80211_band band; | |
607 | ||
608 | if (!netif_running(dev)) | |
609 | return -ENETDOWN; | |
610 | ||
b2e3abdc HS |
611 | if (wrqu->data.length == sizeof(struct iw_scan_req)) |
612 | wreq = (struct iw_scan_req *)extra; | |
613 | ||
463d0183 | 614 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
615 | |
616 | if (IS_ERR(rdev)) | |
617 | return PTR_ERR(rdev); | |
618 | ||
619 | if (rdev->scan_req) { | |
620 | err = -EBUSY; | |
621 | goto out; | |
622 | } | |
623 | ||
624 | wiphy = &rdev->wiphy; | |
625 | ||
b2e3abdc HS |
626 | /* Determine number of channels, needed to allocate creq */ |
627 | if (wreq && wreq->num_channels) | |
628 | n_channels = wreq->num_channels; | |
629 | else { | |
630 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) | |
631 | if (wiphy->bands[band]) | |
632 | n_channels += wiphy->bands[band]->n_channels; | |
633 | } | |
2a519311 JB |
634 | |
635 | creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + | |
636 | n_channels * sizeof(void *), | |
637 | GFP_ATOMIC); | |
638 | if (!creq) { | |
639 | err = -ENOMEM; | |
640 | goto out; | |
641 | } | |
642 | ||
643 | creq->wiphy = wiphy; | |
463d0183 | 644 | creq->dev = dev; |
5ba63533 JB |
645 | /* SSIDs come after channels */ |
646 | creq->ssids = (void *)&creq->channels[n_channels]; | |
2a519311 JB |
647 | creq->n_channels = n_channels; |
648 | creq->n_ssids = 1; | |
649 | ||
b2e3abdc | 650 | /* translate "Scan on frequencies" request */ |
2a519311 JB |
651 | i = 0; |
652 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
653 | int j; | |
584991dc | 654 | |
2a519311 JB |
655 | if (!wiphy->bands[band]) |
656 | continue; | |
584991dc | 657 | |
2a519311 | 658 | for (j = 0; j < wiphy->bands[band]->n_channels; j++) { |
584991dc JB |
659 | /* ignore disabled channels */ |
660 | if (wiphy->bands[band]->channels[j].flags & | |
661 | IEEE80211_CHAN_DISABLED) | |
662 | continue; | |
b2e3abdc HS |
663 | |
664 | /* If we have a wireless request structure and the | |
665 | * wireless request specifies frequencies, then search | |
666 | * for the matching hardware channel. | |
667 | */ | |
668 | if (wreq && wreq->num_channels) { | |
669 | int k; | |
670 | int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; | |
671 | for (k = 0; k < wreq->num_channels; k++) { | |
a4e7b730 | 672 | int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]); |
b2e3abdc HS |
673 | if (wext_freq == wiphy_freq) |
674 | goto wext_freq_found; | |
675 | } | |
676 | goto wext_freq_not_found; | |
677 | } | |
678 | ||
679 | wext_freq_found: | |
2a519311 JB |
680 | creq->channels[i] = &wiphy->bands[band]->channels[j]; |
681 | i++; | |
b2e3abdc | 682 | wext_freq_not_found: ; |
2a519311 JB |
683 | } |
684 | } | |
8862dc5f HS |
685 | /* No channels found? */ |
686 | if (!i) { | |
687 | err = -EINVAL; | |
688 | goto out; | |
689 | } | |
2a519311 | 690 | |
b2e3abdc HS |
691 | /* Set real number of channels specified in creq->channels[] */ |
692 | creq->n_channels = i; | |
2a519311 | 693 | |
b2e3abdc HS |
694 | /* translate "Scan for SSID" request */ |
695 | if (wreq) { | |
2a519311 | 696 | if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { |
65486c8b JB |
697 | if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { |
698 | err = -EINVAL; | |
699 | goto out; | |
700 | } | |
2a519311 JB |
701 | memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); |
702 | creq->ssids[0].ssid_len = wreq->essid_len; | |
703 | } | |
704 | if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) | |
705 | creq->n_ssids = 0; | |
706 | } | |
707 | ||
708 | rdev->scan_req = creq; | |
709 | err = rdev->ops->scan(wiphy, dev, creq); | |
710 | if (err) { | |
711 | rdev->scan_req = NULL; | |
65486c8b | 712 | /* creq will be freed below */ |
463d0183 | 713 | } else { |
a538e2d5 | 714 | nl80211_send_scan_start(rdev, dev); |
65486c8b JB |
715 | /* creq now owned by driver */ |
716 | creq = NULL; | |
463d0183 JB |
717 | dev_hold(dev); |
718 | } | |
2a519311 | 719 | out: |
65486c8b | 720 | kfree(creq); |
4d0c8aea | 721 | cfg80211_unlock_rdev(rdev); |
2a519311 JB |
722 | return err; |
723 | } | |
ba44cb72 | 724 | EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan); |
2a519311 JB |
725 | |
726 | static void ieee80211_scan_add_ies(struct iw_request_info *info, | |
727 | struct cfg80211_bss *bss, | |
728 | char **current_ev, char *end_buf) | |
729 | { | |
730 | u8 *pos, *end, *next; | |
731 | struct iw_event iwe; | |
732 | ||
733 | if (!bss->information_elements || | |
734 | !bss->len_information_elements) | |
735 | return; | |
736 | ||
737 | /* | |
738 | * If needed, fragment the IEs buffer (at IE boundaries) into short | |
739 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. | |
740 | */ | |
741 | pos = bss->information_elements; | |
742 | end = pos + bss->len_information_elements; | |
743 | ||
744 | while (end - pos > IW_GENERIC_IE_MAX) { | |
745 | next = pos + 2 + pos[1]; | |
746 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) | |
747 | next = next + 2 + next[1]; | |
748 | ||
749 | memset(&iwe, 0, sizeof(iwe)); | |
750 | iwe.cmd = IWEVGENIE; | |
751 | iwe.u.data.length = next - pos; | |
752 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
753 | end_buf, &iwe, pos); | |
754 | ||
755 | pos = next; | |
756 | } | |
757 | ||
758 | if (end > pos) { | |
759 | memset(&iwe, 0, sizeof(iwe)); | |
760 | iwe.cmd = IWEVGENIE; | |
761 | iwe.u.data.length = end - pos; | |
762 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
763 | end_buf, &iwe, pos); | |
764 | } | |
765 | } | |
766 | ||
cb3a8eec DW |
767 | static inline unsigned int elapsed_jiffies_msecs(unsigned long start) |
768 | { | |
769 | unsigned long end = jiffies; | |
770 | ||
771 | if (end >= start) | |
772 | return jiffies_to_msecs(end - start); | |
773 | ||
774 | return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1); | |
775 | } | |
2a519311 JB |
776 | |
777 | static char * | |
77965c97 JB |
778 | ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, |
779 | struct cfg80211_internal_bss *bss, char *current_ev, | |
780 | char *end_buf) | |
2a519311 JB |
781 | { |
782 | struct iw_event iwe; | |
783 | u8 *buf, *cfg, *p; | |
784 | u8 *ie = bss->pub.information_elements; | |
a77b8552 | 785 | int rem = bss->pub.len_information_elements, i, sig; |
2a519311 JB |
786 | bool ismesh = false; |
787 | ||
788 | memset(&iwe, 0, sizeof(iwe)); | |
789 | iwe.cmd = SIOCGIWAP; | |
790 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; | |
791 | memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); | |
792 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
793 | IW_EV_ADDR_LEN); | |
794 | ||
795 | memset(&iwe, 0, sizeof(iwe)); | |
796 | iwe.cmd = SIOCGIWFREQ; | |
797 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); | |
798 | iwe.u.freq.e = 0; | |
799 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
800 | IW_EV_FREQ_LEN); | |
801 | ||
802 | memset(&iwe, 0, sizeof(iwe)); | |
803 | iwe.cmd = SIOCGIWFREQ; | |
804 | iwe.u.freq.m = bss->pub.channel->center_freq; | |
805 | iwe.u.freq.e = 6; | |
806 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
807 | IW_EV_FREQ_LEN); | |
808 | ||
77965c97 | 809 | if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { |
2a519311 JB |
810 | memset(&iwe, 0, sizeof(iwe)); |
811 | iwe.cmd = IWEVQUAL; | |
812 | iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | | |
813 | IW_QUAL_NOISE_INVALID | | |
a77b8552 | 814 | IW_QUAL_QUAL_UPDATED; |
77965c97 | 815 | switch (wiphy->signal_type) { |
2a519311 | 816 | case CFG80211_SIGNAL_TYPE_MBM: |
a77b8552 JB |
817 | sig = bss->pub.signal / 100; |
818 | iwe.u.qual.level = sig; | |
2a519311 | 819 | iwe.u.qual.updated |= IW_QUAL_DBM; |
a77b8552 JB |
820 | if (sig < -110) /* rather bad */ |
821 | sig = -110; | |
822 | else if (sig > -40) /* perfect */ | |
823 | sig = -40; | |
824 | /* will give a range of 0 .. 70 */ | |
825 | iwe.u.qual.qual = sig + 110; | |
2a519311 JB |
826 | break; |
827 | case CFG80211_SIGNAL_TYPE_UNSPEC: | |
828 | iwe.u.qual.level = bss->pub.signal; | |
a77b8552 JB |
829 | /* will give range 0 .. 100 */ |
830 | iwe.u.qual.qual = bss->pub.signal; | |
2a519311 JB |
831 | break; |
832 | default: | |
833 | /* not reached */ | |
834 | break; | |
835 | } | |
836 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
837 | &iwe, IW_EV_QUAL_LEN); | |
838 | } | |
839 | ||
840 | memset(&iwe, 0, sizeof(iwe)); | |
841 | iwe.cmd = SIOCGIWENCODE; | |
842 | if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) | |
843 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; | |
844 | else | |
845 | iwe.u.data.flags = IW_ENCODE_DISABLED; | |
846 | iwe.u.data.length = 0; | |
847 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
848 | &iwe, ""); | |
849 | ||
850 | while (rem >= 2) { | |
851 | /* invalid data */ | |
852 | if (ie[1] > rem - 2) | |
853 | break; | |
854 | ||
855 | switch (ie[0]) { | |
856 | case WLAN_EID_SSID: | |
857 | memset(&iwe, 0, sizeof(iwe)); | |
858 | iwe.cmd = SIOCGIWESSID; | |
859 | iwe.u.data.length = ie[1]; | |
860 | iwe.u.data.flags = 1; | |
861 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
862 | &iwe, ie + 2); | |
863 | break; | |
864 | case WLAN_EID_MESH_ID: | |
865 | memset(&iwe, 0, sizeof(iwe)); | |
866 | iwe.cmd = SIOCGIWESSID; | |
867 | iwe.u.data.length = ie[1]; | |
868 | iwe.u.data.flags = 1; | |
869 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
870 | &iwe, ie + 2); | |
871 | break; | |
872 | case WLAN_EID_MESH_CONFIG: | |
873 | ismesh = true; | |
136cfa28 | 874 | if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) |
2a519311 JB |
875 | break; |
876 | buf = kmalloc(50, GFP_ATOMIC); | |
877 | if (!buf) | |
878 | break; | |
879 | cfg = ie + 2; | |
880 | memset(&iwe, 0, sizeof(iwe)); | |
881 | iwe.cmd = IWEVCUSTOM; | |
76aa5e70 RP |
882 | sprintf(buf, "Mesh Network Path Selection Protocol ID: " |
883 | "0x%02X", cfg[0]); | |
2a519311 JB |
884 | iwe.u.data.length = strlen(buf); |
885 | current_ev = iwe_stream_add_point(info, current_ev, | |
886 | end_buf, | |
887 | &iwe, buf); | |
76aa5e70 RP |
888 | sprintf(buf, "Path Selection Metric ID: 0x%02X", |
889 | cfg[1]); | |
2a519311 JB |
890 | iwe.u.data.length = strlen(buf); |
891 | current_ev = iwe_stream_add_point(info, current_ev, | |
892 | end_buf, | |
893 | &iwe, buf); | |
76aa5e70 RP |
894 | sprintf(buf, "Congestion Control Mode ID: 0x%02X", |
895 | cfg[2]); | |
2a519311 JB |
896 | iwe.u.data.length = strlen(buf); |
897 | current_ev = iwe_stream_add_point(info, current_ev, | |
898 | end_buf, | |
899 | &iwe, buf); | |
76aa5e70 | 900 | sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]); |
2a519311 JB |
901 | iwe.u.data.length = strlen(buf); |
902 | current_ev = iwe_stream_add_point(info, current_ev, | |
903 | end_buf, | |
904 | &iwe, buf); | |
76aa5e70 RP |
905 | sprintf(buf, "Authentication ID: 0x%02X", cfg[4]); |
906 | iwe.u.data.length = strlen(buf); | |
907 | current_ev = iwe_stream_add_point(info, current_ev, | |
908 | end_buf, | |
909 | &iwe, buf); | |
910 | sprintf(buf, "Formation Info: 0x%02X", cfg[5]); | |
911 | iwe.u.data.length = strlen(buf); | |
912 | current_ev = iwe_stream_add_point(info, current_ev, | |
913 | end_buf, | |
914 | &iwe, buf); | |
915 | sprintf(buf, "Capabilities: 0x%02X", cfg[6]); | |
2a519311 JB |
916 | iwe.u.data.length = strlen(buf); |
917 | current_ev = iwe_stream_add_point(info, current_ev, | |
918 | end_buf, | |
919 | &iwe, buf); | |
920 | kfree(buf); | |
921 | break; | |
922 | case WLAN_EID_SUPP_RATES: | |
923 | case WLAN_EID_EXT_SUPP_RATES: | |
924 | /* display all supported rates in readable format */ | |
925 | p = current_ev + iwe_stream_lcp_len(info); | |
926 | ||
927 | memset(&iwe, 0, sizeof(iwe)); | |
928 | iwe.cmd = SIOCGIWRATE; | |
929 | /* Those two flags are ignored... */ | |
930 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; | |
931 | ||
932 | for (i = 0; i < ie[1]; i++) { | |
933 | iwe.u.bitrate.value = | |
934 | ((ie[i + 2] & 0x7f) * 500000); | |
935 | p = iwe_stream_add_value(info, current_ev, p, | |
936 | end_buf, &iwe, IW_EV_PARAM_LEN); | |
937 | } | |
938 | current_ev = p; | |
939 | break; | |
940 | } | |
941 | rem -= ie[1] + 2; | |
942 | ie += ie[1] + 2; | |
943 | } | |
944 | ||
f64f9e71 JP |
945 | if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || |
946 | ismesh) { | |
2a519311 JB |
947 | memset(&iwe, 0, sizeof(iwe)); |
948 | iwe.cmd = SIOCGIWMODE; | |
949 | if (ismesh) | |
950 | iwe.u.mode = IW_MODE_MESH; | |
951 | else if (bss->pub.capability & WLAN_CAPABILITY_ESS) | |
952 | iwe.u.mode = IW_MODE_MASTER; | |
953 | else | |
954 | iwe.u.mode = IW_MODE_ADHOC; | |
955 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
956 | &iwe, IW_EV_UINT_LEN); | |
957 | } | |
958 | ||
959 | buf = kmalloc(30, GFP_ATOMIC); | |
960 | if (buf) { | |
961 | memset(&iwe, 0, sizeof(iwe)); | |
962 | iwe.cmd = IWEVCUSTOM; | |
963 | sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf)); | |
964 | iwe.u.data.length = strlen(buf); | |
965 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
966 | &iwe, buf); | |
967 | memset(&iwe, 0, sizeof(iwe)); | |
968 | iwe.cmd = IWEVCUSTOM; | |
cb3a8eec DW |
969 | sprintf(buf, " Last beacon: %ums ago", |
970 | elapsed_jiffies_msecs(bss->ts)); | |
2a519311 JB |
971 | iwe.u.data.length = strlen(buf); |
972 | current_ev = iwe_stream_add_point(info, current_ev, | |
973 | end_buf, &iwe, buf); | |
974 | kfree(buf); | |
975 | } | |
976 | ||
977 | ieee80211_scan_add_ies(info, &bss->pub, ¤t_ev, end_buf); | |
978 | ||
979 | return current_ev; | |
980 | } | |
981 | ||
982 | ||
983 | static int ieee80211_scan_results(struct cfg80211_registered_device *dev, | |
984 | struct iw_request_info *info, | |
985 | char *buf, size_t len) | |
986 | { | |
987 | char *current_ev = buf; | |
988 | char *end_buf = buf + len; | |
989 | struct cfg80211_internal_bss *bss; | |
990 | ||
991 | spin_lock_bh(&dev->bss_lock); | |
992 | cfg80211_bss_expire(dev); | |
993 | ||
994 | list_for_each_entry(bss, &dev->bss_list, list) { | |
995 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { | |
996 | spin_unlock_bh(&dev->bss_lock); | |
997 | return -E2BIG; | |
998 | } | |
77965c97 JB |
999 | current_ev = ieee80211_bss(&dev->wiphy, info, bss, |
1000 | current_ev, end_buf); | |
2a519311 JB |
1001 | } |
1002 | spin_unlock_bh(&dev->bss_lock); | |
1003 | return current_ev - buf; | |
1004 | } | |
1005 | ||
1006 | ||
1007 | int cfg80211_wext_giwscan(struct net_device *dev, | |
1008 | struct iw_request_info *info, | |
1009 | struct iw_point *data, char *extra) | |
1010 | { | |
1011 | struct cfg80211_registered_device *rdev; | |
1012 | int res; | |
1013 | ||
1014 | if (!netif_running(dev)) | |
1015 | return -ENETDOWN; | |
1016 | ||
463d0183 | 1017 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
1018 | |
1019 | if (IS_ERR(rdev)) | |
1020 | return PTR_ERR(rdev); | |
1021 | ||
1022 | if (rdev->scan_req) { | |
1023 | res = -EAGAIN; | |
1024 | goto out; | |
1025 | } | |
1026 | ||
1027 | res = ieee80211_scan_results(rdev, info, extra, data->length); | |
1028 | data->length = 0; | |
1029 | if (res >= 0) { | |
1030 | data->length = res; | |
1031 | res = 0; | |
1032 | } | |
1033 | ||
1034 | out: | |
4d0c8aea | 1035 | cfg80211_unlock_rdev(rdev); |
2a519311 JB |
1036 | return res; |
1037 | } | |
ba44cb72 | 1038 | EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan); |
2a519311 | 1039 | #endif |