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" | |
17 | ||
18 | #define IEEE80211_SCAN_RESULT_EXPIRE (10 * HZ) | |
19 | ||
667503dd | 20 | void __cfg80211_scan_done(struct work_struct *wk) |
2a519311 | 21 | { |
667503dd JB |
22 | struct cfg80211_registered_device *rdev; |
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 | rdev = container_of(wk, struct cfg80211_registered_device, |
30 | scan_done_wk); | |
31 | ||
32 | mutex_lock(&rdev->mtx); | |
33 | request = rdev->scan_req; | |
34 | ||
463d0183 | 35 | dev = request->dev; |
2a519311 | 36 | |
6829c878 JB |
37 | /* |
38 | * This must be before sending the other events! | |
39 | * Otherwise, wpa_supplicant gets completely confused with | |
40 | * wext events. | |
41 | */ | |
42 | cfg80211_sme_scan_done(dev); | |
43 | ||
667503dd | 44 | if (request->aborted) |
2a519311 JB |
45 | nl80211_send_scan_aborted(wiphy_to_dev(request->wiphy), dev); |
46 | else | |
47 | nl80211_send_scan_done(wiphy_to_dev(request->wiphy), dev); | |
48 | ||
49 | #ifdef CONFIG_WIRELESS_EXT | |
667503dd | 50 | if (!request->aborted) { |
2a519311 JB |
51 | memset(&wrqu, 0, sizeof(wrqu)); |
52 | ||
53 | wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL); | |
54 | } | |
55 | #endif | |
56 | ||
57 | dev_put(dev); | |
58 | ||
667503dd | 59 | cfg80211_unlock_rdev(rdev); |
9e81eccf | 60 | wiphy_to_dev(request->wiphy)->scan_req = NULL; |
2a519311 JB |
61 | kfree(request); |
62 | } | |
667503dd JB |
63 | |
64 | void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted) | |
65 | { | |
667503dd JB |
66 | WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req); |
67 | ||
68 | request->aborted = aborted; | |
69 | schedule_work(&wiphy_to_dev(request->wiphy)->scan_done_wk); | |
667503dd | 70 | } |
2a519311 JB |
71 | EXPORT_SYMBOL(cfg80211_scan_done); |
72 | ||
73 | static void bss_release(struct kref *ref) | |
74 | { | |
75 | struct cfg80211_internal_bss *bss; | |
76 | ||
77 | bss = container_of(ref, struct cfg80211_internal_bss, ref); | |
78c1c7e1 JB |
78 | if (bss->pub.free_priv) |
79 | bss->pub.free_priv(&bss->pub); | |
cd1658f5 JB |
80 | |
81 | if (bss->ies_allocated) | |
82 | kfree(bss->pub.information_elements); | |
83 | ||
19957bb3 JB |
84 | BUG_ON(atomic_read(&bss->hold)); |
85 | ||
2a519311 JB |
86 | kfree(bss); |
87 | } | |
88 | ||
cb3a8eec DW |
89 | /* must hold dev->bss_lock! */ |
90 | void cfg80211_bss_age(struct cfg80211_registered_device *dev, | |
91 | unsigned long age_secs) | |
92 | { | |
93 | struct cfg80211_internal_bss *bss; | |
94 | unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); | |
95 | ||
96 | list_for_each_entry(bss, &dev->bss_list, list) { | |
97 | bss->ts -= age_jiffies; | |
98 | } | |
99 | } | |
100 | ||
2a519311 JB |
101 | /* must hold dev->bss_lock! */ |
102 | void cfg80211_bss_expire(struct cfg80211_registered_device *dev) | |
103 | { | |
104 | struct cfg80211_internal_bss *bss, *tmp; | |
105 | bool expired = false; | |
106 | ||
107 | list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) { | |
19957bb3 JB |
108 | if (atomic_read(&bss->hold)) |
109 | continue; | |
110 | if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE)) | |
2a519311 JB |
111 | continue; |
112 | list_del(&bss->list); | |
113 | rb_erase(&bss->rbn, &dev->bss_tree); | |
114 | kref_put(&bss->ref, bss_release); | |
115 | expired = true; | |
116 | } | |
117 | ||
118 | if (expired) | |
119 | dev->bss_generation++; | |
120 | } | |
121 | ||
122 | static u8 *find_ie(u8 num, u8 *ies, size_t len) | |
123 | { | |
124 | while (len > 2 && ies[0] != num) { | |
125 | len -= ies[1] + 2; | |
126 | ies += ies[1] + 2; | |
127 | } | |
128 | if (len < 2) | |
129 | return NULL; | |
130 | if (len < 2 + ies[1]) | |
131 | return NULL; | |
132 | return ies; | |
133 | } | |
134 | ||
135 | static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2) | |
136 | { | |
137 | const u8 *ie1 = find_ie(num, ies1, len1); | |
138 | const u8 *ie2 = find_ie(num, ies2, len2); | |
139 | int r; | |
140 | ||
141 | if (!ie1 && !ie2) | |
142 | return 0; | |
143 | if (!ie1) | |
144 | return -1; | |
145 | ||
146 | r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1])); | |
147 | if (r == 0 && ie1[1] != ie2[1]) | |
148 | return ie2[1] - ie1[1]; | |
149 | return r; | |
150 | } | |
151 | ||
152 | static bool is_bss(struct cfg80211_bss *a, | |
153 | const u8 *bssid, | |
154 | const u8 *ssid, size_t ssid_len) | |
155 | { | |
156 | const u8 *ssidie; | |
157 | ||
79420f09 | 158 | if (bssid && compare_ether_addr(a->bssid, bssid)) |
2a519311 JB |
159 | return false; |
160 | ||
79420f09 JB |
161 | if (!ssid) |
162 | return true; | |
163 | ||
2a519311 JB |
164 | ssidie = find_ie(WLAN_EID_SSID, |
165 | a->information_elements, | |
166 | a->len_information_elements); | |
167 | if (!ssidie) | |
168 | return false; | |
169 | if (ssidie[1] != ssid_len) | |
170 | return false; | |
171 | return memcmp(ssidie + 2, ssid, ssid_len) == 0; | |
172 | } | |
173 | ||
174 | static bool is_mesh(struct cfg80211_bss *a, | |
175 | const u8 *meshid, size_t meshidlen, | |
176 | const u8 *meshcfg) | |
177 | { | |
178 | const u8 *ie; | |
179 | ||
180 | if (!is_zero_ether_addr(a->bssid)) | |
181 | return false; | |
182 | ||
183 | ie = find_ie(WLAN_EID_MESH_ID, | |
184 | a->information_elements, | |
185 | a->len_information_elements); | |
186 | if (!ie) | |
187 | return false; | |
188 | if (ie[1] != meshidlen) | |
189 | return false; | |
190 | if (memcmp(ie + 2, meshid, meshidlen)) | |
191 | return false; | |
192 | ||
193 | ie = find_ie(WLAN_EID_MESH_CONFIG, | |
194 | a->information_elements, | |
195 | a->len_information_elements); | |
196 | if (ie[1] != IEEE80211_MESH_CONFIG_LEN) | |
197 | return false; | |
198 | ||
199 | /* | |
200 | * Ignore mesh capability (last two bytes of the IE) when | |
201 | * comparing since that may differ between stations taking | |
202 | * part in the same mesh. | |
203 | */ | |
204 | return memcmp(ie + 2, meshcfg, IEEE80211_MESH_CONFIG_LEN - 2) == 0; | |
205 | } | |
206 | ||
207 | static int cmp_bss(struct cfg80211_bss *a, | |
208 | struct cfg80211_bss *b) | |
209 | { | |
210 | int r; | |
211 | ||
212 | if (a->channel != b->channel) | |
213 | return b->channel->center_freq - a->channel->center_freq; | |
214 | ||
215 | r = memcmp(a->bssid, b->bssid, ETH_ALEN); | |
216 | if (r) | |
217 | return r; | |
218 | ||
219 | if (is_zero_ether_addr(a->bssid)) { | |
220 | r = cmp_ies(WLAN_EID_MESH_ID, | |
221 | a->information_elements, | |
222 | a->len_information_elements, | |
223 | b->information_elements, | |
224 | b->len_information_elements); | |
225 | if (r) | |
226 | return r; | |
227 | return cmp_ies(WLAN_EID_MESH_CONFIG, | |
228 | a->information_elements, | |
229 | a->len_information_elements, | |
230 | b->information_elements, | |
231 | b->len_information_elements); | |
232 | } | |
233 | ||
234 | return cmp_ies(WLAN_EID_SSID, | |
235 | a->information_elements, | |
236 | a->len_information_elements, | |
237 | b->information_elements, | |
238 | b->len_information_elements); | |
239 | } | |
240 | ||
241 | struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, | |
242 | struct ieee80211_channel *channel, | |
243 | const u8 *bssid, | |
79420f09 JB |
244 | const u8 *ssid, size_t ssid_len, |
245 | u16 capa_mask, u16 capa_val) | |
2a519311 JB |
246 | { |
247 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
248 | struct cfg80211_internal_bss *bss, *res = NULL; | |
249 | ||
250 | spin_lock_bh(&dev->bss_lock); | |
251 | ||
252 | list_for_each_entry(bss, &dev->bss_list, list) { | |
79420f09 JB |
253 | if ((bss->pub.capability & capa_mask) != capa_val) |
254 | continue; | |
2a519311 JB |
255 | if (channel && bss->pub.channel != channel) |
256 | continue; | |
257 | if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { | |
258 | res = bss; | |
259 | kref_get(&res->ref); | |
260 | break; | |
261 | } | |
262 | } | |
263 | ||
264 | spin_unlock_bh(&dev->bss_lock); | |
265 | if (!res) | |
266 | return NULL; | |
267 | return &res->pub; | |
268 | } | |
269 | EXPORT_SYMBOL(cfg80211_get_bss); | |
270 | ||
271 | struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy, | |
272 | struct ieee80211_channel *channel, | |
273 | const u8 *meshid, size_t meshidlen, | |
274 | const u8 *meshcfg) | |
275 | { | |
276 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
277 | struct cfg80211_internal_bss *bss, *res = NULL; | |
278 | ||
279 | spin_lock_bh(&dev->bss_lock); | |
280 | ||
281 | list_for_each_entry(bss, &dev->bss_list, list) { | |
282 | if (channel && bss->pub.channel != channel) | |
283 | continue; | |
284 | if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) { | |
285 | res = bss; | |
286 | kref_get(&res->ref); | |
287 | break; | |
288 | } | |
289 | } | |
290 | ||
291 | spin_unlock_bh(&dev->bss_lock); | |
292 | if (!res) | |
293 | return NULL; | |
294 | return &res->pub; | |
295 | } | |
296 | EXPORT_SYMBOL(cfg80211_get_mesh); | |
297 | ||
298 | ||
299 | static void rb_insert_bss(struct cfg80211_registered_device *dev, | |
300 | struct cfg80211_internal_bss *bss) | |
301 | { | |
302 | struct rb_node **p = &dev->bss_tree.rb_node; | |
303 | struct rb_node *parent = NULL; | |
304 | struct cfg80211_internal_bss *tbss; | |
305 | int cmp; | |
306 | ||
307 | while (*p) { | |
308 | parent = *p; | |
309 | tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); | |
310 | ||
311 | cmp = cmp_bss(&bss->pub, &tbss->pub); | |
312 | ||
313 | if (WARN_ON(!cmp)) { | |
314 | /* will sort of leak this BSS */ | |
315 | return; | |
316 | } | |
317 | ||
318 | if (cmp < 0) | |
319 | p = &(*p)->rb_left; | |
320 | else | |
321 | p = &(*p)->rb_right; | |
322 | } | |
323 | ||
324 | rb_link_node(&bss->rbn, parent, p); | |
325 | rb_insert_color(&bss->rbn, &dev->bss_tree); | |
326 | } | |
327 | ||
328 | static struct cfg80211_internal_bss * | |
329 | rb_find_bss(struct cfg80211_registered_device *dev, | |
330 | struct cfg80211_internal_bss *res) | |
331 | { | |
332 | struct rb_node *n = dev->bss_tree.rb_node; | |
333 | struct cfg80211_internal_bss *bss; | |
334 | int r; | |
335 | ||
336 | while (n) { | |
337 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); | |
338 | r = cmp_bss(&res->pub, &bss->pub); | |
339 | ||
340 | if (r == 0) | |
341 | return bss; | |
342 | else if (r < 0) | |
343 | n = n->rb_left; | |
344 | else | |
345 | n = n->rb_right; | |
346 | } | |
347 | ||
348 | return NULL; | |
349 | } | |
350 | ||
351 | static struct cfg80211_internal_bss * | |
352 | cfg80211_bss_update(struct cfg80211_registered_device *dev, | |
353 | struct cfg80211_internal_bss *res, | |
354 | bool overwrite) | |
355 | { | |
356 | struct cfg80211_internal_bss *found = NULL; | |
357 | const u8 *meshid, *meshcfg; | |
358 | ||
359 | /* | |
360 | * The reference to "res" is donated to this function. | |
361 | */ | |
362 | ||
363 | if (WARN_ON(!res->pub.channel)) { | |
364 | kref_put(&res->ref, bss_release); | |
365 | return NULL; | |
366 | } | |
367 | ||
368 | res->ts = jiffies; | |
369 | ||
370 | if (is_zero_ether_addr(res->pub.bssid)) { | |
371 | /* must be mesh, verify */ | |
372 | meshid = find_ie(WLAN_EID_MESH_ID, res->pub.information_elements, | |
373 | res->pub.len_information_elements); | |
374 | meshcfg = find_ie(WLAN_EID_MESH_CONFIG, | |
375 | res->pub.information_elements, | |
376 | res->pub.len_information_elements); | |
377 | if (!meshid || !meshcfg || | |
378 | meshcfg[1] != IEEE80211_MESH_CONFIG_LEN) { | |
379 | /* bogus mesh */ | |
380 | kref_put(&res->ref, bss_release); | |
381 | return NULL; | |
382 | } | |
383 | } | |
384 | ||
385 | spin_lock_bh(&dev->bss_lock); | |
386 | ||
387 | found = rb_find_bss(dev, res); | |
388 | ||
cd1658f5 | 389 | if (found) { |
2a519311 JB |
390 | found->pub.beacon_interval = res->pub.beacon_interval; |
391 | found->pub.tsf = res->pub.tsf; | |
392 | found->pub.signal = res->pub.signal; | |
2a519311 JB |
393 | found->pub.capability = res->pub.capability; |
394 | found->ts = res->ts; | |
cd1658f5 JB |
395 | |
396 | /* overwrite IEs */ | |
397 | if (overwrite) { | |
398 | size_t used = dev->wiphy.bss_priv_size + sizeof(*res); | |
399 | size_t ielen = res->pub.len_information_elements; | |
400 | ||
44e1b98f | 401 | if (!found->ies_allocated && ksize(found) >= used + ielen) { |
cd1658f5 JB |
402 | memcpy(found->pub.information_elements, |
403 | res->pub.information_elements, ielen); | |
404 | found->pub.len_information_elements = ielen; | |
405 | } else { | |
406 | u8 *ies = found->pub.information_elements; | |
407 | ||
273de92c MB |
408 | if (found->ies_allocated) |
409 | ies = krealloc(ies, ielen, GFP_ATOMIC); | |
410 | else | |
cd1658f5 JB |
411 | ies = kmalloc(ielen, GFP_ATOMIC); |
412 | ||
413 | if (ies) { | |
414 | memcpy(ies, res->pub.information_elements, ielen); | |
415 | found->ies_allocated = true; | |
416 | found->pub.information_elements = ies; | |
c0f0aac0 | 417 | found->pub.len_information_elements = ielen; |
cd1658f5 JB |
418 | } |
419 | } | |
420 | } | |
421 | ||
2a519311 JB |
422 | kref_put(&res->ref, bss_release); |
423 | } else { | |
424 | /* this "consumes" the reference */ | |
425 | list_add_tail(&res->list, &dev->bss_list); | |
426 | rb_insert_bss(dev, res); | |
427 | found = res; | |
428 | } | |
429 | ||
430 | dev->bss_generation++; | |
431 | spin_unlock_bh(&dev->bss_lock); | |
432 | ||
433 | kref_get(&found->ref); | |
434 | return found; | |
435 | } | |
436 | ||
06aa7afa JK |
437 | struct cfg80211_bss* |
438 | cfg80211_inform_bss(struct wiphy *wiphy, | |
439 | struct ieee80211_channel *channel, | |
440 | const u8 *bssid, | |
441 | u64 timestamp, u16 capability, u16 beacon_interval, | |
442 | const u8 *ie, size_t ielen, | |
443 | s32 signal, gfp_t gfp) | |
444 | { | |
445 | struct cfg80211_internal_bss *res; | |
446 | size_t privsz; | |
447 | ||
448 | if (WARN_ON(!wiphy)) | |
449 | return NULL; | |
450 | ||
451 | privsz = wiphy->bss_priv_size; | |
452 | ||
453 | if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC && | |
454 | (signal < 0 || signal > 100))) | |
455 | return NULL; | |
456 | ||
457 | res = kzalloc(sizeof(*res) + privsz + ielen, gfp); | |
458 | if (!res) | |
459 | return NULL; | |
460 | ||
461 | memcpy(res->pub.bssid, bssid, ETH_ALEN); | |
462 | res->pub.channel = channel; | |
463 | res->pub.signal = signal; | |
464 | res->pub.tsf = timestamp; | |
465 | res->pub.beacon_interval = beacon_interval; | |
466 | res->pub.capability = capability; | |
467 | /* point to after the private area */ | |
468 | res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz; | |
469 | memcpy(res->pub.information_elements, ie, ielen); | |
470 | res->pub.len_information_elements = ielen; | |
471 | ||
472 | kref_init(&res->ref); | |
473 | ||
474 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, 0); | |
475 | if (!res) | |
476 | return NULL; | |
477 | ||
478 | if (res->pub.capability & WLAN_CAPABILITY_ESS) | |
479 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
480 | ||
481 | /* cfg80211_bss_update gives us a referenced result */ | |
482 | return &res->pub; | |
483 | } | |
484 | EXPORT_SYMBOL(cfg80211_inform_bss); | |
485 | ||
2a519311 JB |
486 | struct cfg80211_bss * |
487 | cfg80211_inform_bss_frame(struct wiphy *wiphy, | |
488 | struct ieee80211_channel *channel, | |
489 | struct ieee80211_mgmt *mgmt, size_t len, | |
77965c97 | 490 | s32 signal, gfp_t gfp) |
2a519311 JB |
491 | { |
492 | struct cfg80211_internal_bss *res; | |
493 | size_t ielen = len - offsetof(struct ieee80211_mgmt, | |
494 | u.probe_resp.variable); | |
495 | bool overwrite; | |
496 | size_t privsz = wiphy->bss_priv_size; | |
497 | ||
77965c97 | 498 | if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC && |
2a519311 JB |
499 | (signal < 0 || signal > 100))) |
500 | return NULL; | |
501 | ||
502 | if (WARN_ON(!mgmt || !wiphy || | |
503 | len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) | |
504 | return NULL; | |
505 | ||
506 | res = kzalloc(sizeof(*res) + privsz + ielen, gfp); | |
507 | if (!res) | |
508 | return NULL; | |
509 | ||
510 | memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN); | |
511 | res->pub.channel = channel; | |
2a519311 JB |
512 | res->pub.signal = signal; |
513 | res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); | |
514 | res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); | |
515 | res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); | |
516 | /* point to after the private area */ | |
517 | res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz; | |
518 | memcpy(res->pub.information_elements, mgmt->u.probe_resp.variable, ielen); | |
519 | res->pub.len_information_elements = ielen; | |
520 | ||
521 | kref_init(&res->ref); | |
522 | ||
523 | overwrite = ieee80211_is_probe_resp(mgmt->frame_control); | |
524 | ||
525 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, overwrite); | |
526 | if (!res) | |
527 | return NULL; | |
528 | ||
e38f8a7a LR |
529 | if (res->pub.capability & WLAN_CAPABILITY_ESS) |
530 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
531 | ||
2a519311 JB |
532 | /* cfg80211_bss_update gives us a referenced result */ |
533 | return &res->pub; | |
534 | } | |
535 | EXPORT_SYMBOL(cfg80211_inform_bss_frame); | |
536 | ||
537 | void cfg80211_put_bss(struct cfg80211_bss *pub) | |
538 | { | |
539 | struct cfg80211_internal_bss *bss; | |
540 | ||
541 | if (!pub) | |
542 | return; | |
543 | ||
544 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
545 | kref_put(&bss->ref, bss_release); | |
546 | } | |
547 | EXPORT_SYMBOL(cfg80211_put_bss); | |
548 | ||
d491af19 JB |
549 | void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
550 | { | |
551 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
552 | struct cfg80211_internal_bss *bss; | |
553 | ||
554 | if (WARN_ON(!pub)) | |
555 | return; | |
556 | ||
557 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
558 | ||
559 | spin_lock_bh(&dev->bss_lock); | |
560 | ||
561 | list_del(&bss->list); | |
562 | rb_erase(&bss->rbn, &dev->bss_tree); | |
563 | ||
564 | spin_unlock_bh(&dev->bss_lock); | |
565 | ||
566 | kref_put(&bss->ref, bss_release); | |
567 | } | |
568 | EXPORT_SYMBOL(cfg80211_unlink_bss); | |
569 | ||
2a519311 JB |
570 | #ifdef CONFIG_WIRELESS_EXT |
571 | int cfg80211_wext_siwscan(struct net_device *dev, | |
572 | struct iw_request_info *info, | |
573 | union iwreq_data *wrqu, char *extra) | |
574 | { | |
575 | struct cfg80211_registered_device *rdev; | |
576 | struct wiphy *wiphy; | |
577 | struct iw_scan_req *wreq = NULL; | |
578 | struct cfg80211_scan_request *creq; | |
579 | int i, err, n_channels = 0; | |
580 | enum ieee80211_band band; | |
581 | ||
582 | if (!netif_running(dev)) | |
583 | return -ENETDOWN; | |
584 | ||
463d0183 | 585 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
586 | |
587 | if (IS_ERR(rdev)) | |
588 | return PTR_ERR(rdev); | |
589 | ||
590 | if (rdev->scan_req) { | |
591 | err = -EBUSY; | |
592 | goto out; | |
593 | } | |
594 | ||
595 | wiphy = &rdev->wiphy; | |
596 | ||
597 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) | |
598 | if (wiphy->bands[band]) | |
599 | n_channels += wiphy->bands[band]->n_channels; | |
600 | ||
601 | creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + | |
602 | n_channels * sizeof(void *), | |
603 | GFP_ATOMIC); | |
604 | if (!creq) { | |
605 | err = -ENOMEM; | |
606 | goto out; | |
607 | } | |
608 | ||
609 | creq->wiphy = wiphy; | |
463d0183 | 610 | creq->dev = dev; |
2a519311 JB |
611 | creq->ssids = (void *)(creq + 1); |
612 | creq->channels = (void *)(creq->ssids + 1); | |
613 | creq->n_channels = n_channels; | |
614 | creq->n_ssids = 1; | |
615 | ||
616 | /* all channels */ | |
617 | i = 0; | |
618 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
619 | int j; | |
620 | if (!wiphy->bands[band]) | |
621 | continue; | |
622 | for (j = 0; j < wiphy->bands[band]->n_channels; j++) { | |
623 | creq->channels[i] = &wiphy->bands[band]->channels[j]; | |
624 | i++; | |
625 | } | |
626 | } | |
627 | ||
628 | /* translate scan request */ | |
629 | if (wrqu->data.length == sizeof(struct iw_scan_req)) { | |
630 | wreq = (struct iw_scan_req *)extra; | |
631 | ||
632 | if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { | |
633 | if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) | |
634 | return -EINVAL; | |
635 | memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); | |
636 | creq->ssids[0].ssid_len = wreq->essid_len; | |
637 | } | |
638 | if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) | |
639 | creq->n_ssids = 0; | |
640 | } | |
641 | ||
642 | rdev->scan_req = creq; | |
643 | err = rdev->ops->scan(wiphy, dev, creq); | |
644 | if (err) { | |
645 | rdev->scan_req = NULL; | |
646 | kfree(creq); | |
463d0183 | 647 | } else { |
a538e2d5 | 648 | nl80211_send_scan_start(rdev, dev); |
463d0183 JB |
649 | dev_hold(dev); |
650 | } | |
2a519311 | 651 | out: |
4d0c8aea | 652 | cfg80211_unlock_rdev(rdev); |
2a519311 JB |
653 | return err; |
654 | } | |
ba44cb72 | 655 | EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan); |
2a519311 JB |
656 | |
657 | static void ieee80211_scan_add_ies(struct iw_request_info *info, | |
658 | struct cfg80211_bss *bss, | |
659 | char **current_ev, char *end_buf) | |
660 | { | |
661 | u8 *pos, *end, *next; | |
662 | struct iw_event iwe; | |
663 | ||
664 | if (!bss->information_elements || | |
665 | !bss->len_information_elements) | |
666 | return; | |
667 | ||
668 | /* | |
669 | * If needed, fragment the IEs buffer (at IE boundaries) into short | |
670 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. | |
671 | */ | |
672 | pos = bss->information_elements; | |
673 | end = pos + bss->len_information_elements; | |
674 | ||
675 | while (end - pos > IW_GENERIC_IE_MAX) { | |
676 | next = pos + 2 + pos[1]; | |
677 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) | |
678 | next = next + 2 + next[1]; | |
679 | ||
680 | memset(&iwe, 0, sizeof(iwe)); | |
681 | iwe.cmd = IWEVGENIE; | |
682 | iwe.u.data.length = next - pos; | |
683 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
684 | end_buf, &iwe, pos); | |
685 | ||
686 | pos = next; | |
687 | } | |
688 | ||
689 | if (end > pos) { | |
690 | memset(&iwe, 0, sizeof(iwe)); | |
691 | iwe.cmd = IWEVGENIE; | |
692 | iwe.u.data.length = end - pos; | |
693 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
694 | end_buf, &iwe, pos); | |
695 | } | |
696 | } | |
697 | ||
cb3a8eec DW |
698 | static inline unsigned int elapsed_jiffies_msecs(unsigned long start) |
699 | { | |
700 | unsigned long end = jiffies; | |
701 | ||
702 | if (end >= start) | |
703 | return jiffies_to_msecs(end - start); | |
704 | ||
705 | return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1); | |
706 | } | |
2a519311 JB |
707 | |
708 | static char * | |
77965c97 JB |
709 | ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, |
710 | struct cfg80211_internal_bss *bss, char *current_ev, | |
711 | char *end_buf) | |
2a519311 JB |
712 | { |
713 | struct iw_event iwe; | |
714 | u8 *buf, *cfg, *p; | |
715 | u8 *ie = bss->pub.information_elements; | |
a77b8552 | 716 | int rem = bss->pub.len_information_elements, i, sig; |
2a519311 JB |
717 | bool ismesh = false; |
718 | ||
719 | memset(&iwe, 0, sizeof(iwe)); | |
720 | iwe.cmd = SIOCGIWAP; | |
721 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; | |
722 | memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); | |
723 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
724 | IW_EV_ADDR_LEN); | |
725 | ||
726 | memset(&iwe, 0, sizeof(iwe)); | |
727 | iwe.cmd = SIOCGIWFREQ; | |
728 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); | |
729 | iwe.u.freq.e = 0; | |
730 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
731 | IW_EV_FREQ_LEN); | |
732 | ||
733 | memset(&iwe, 0, sizeof(iwe)); | |
734 | iwe.cmd = SIOCGIWFREQ; | |
735 | iwe.u.freq.m = bss->pub.channel->center_freq; | |
736 | iwe.u.freq.e = 6; | |
737 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
738 | IW_EV_FREQ_LEN); | |
739 | ||
77965c97 | 740 | if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { |
2a519311 JB |
741 | memset(&iwe, 0, sizeof(iwe)); |
742 | iwe.cmd = IWEVQUAL; | |
743 | iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | | |
744 | IW_QUAL_NOISE_INVALID | | |
a77b8552 | 745 | IW_QUAL_QUAL_UPDATED; |
77965c97 | 746 | switch (wiphy->signal_type) { |
2a519311 | 747 | case CFG80211_SIGNAL_TYPE_MBM: |
a77b8552 JB |
748 | sig = bss->pub.signal / 100; |
749 | iwe.u.qual.level = sig; | |
2a519311 | 750 | iwe.u.qual.updated |= IW_QUAL_DBM; |
a77b8552 JB |
751 | if (sig < -110) /* rather bad */ |
752 | sig = -110; | |
753 | else if (sig > -40) /* perfect */ | |
754 | sig = -40; | |
755 | /* will give a range of 0 .. 70 */ | |
756 | iwe.u.qual.qual = sig + 110; | |
2a519311 JB |
757 | break; |
758 | case CFG80211_SIGNAL_TYPE_UNSPEC: | |
759 | iwe.u.qual.level = bss->pub.signal; | |
a77b8552 JB |
760 | /* will give range 0 .. 100 */ |
761 | iwe.u.qual.qual = bss->pub.signal; | |
2a519311 JB |
762 | break; |
763 | default: | |
764 | /* not reached */ | |
765 | break; | |
766 | } | |
767 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
768 | &iwe, IW_EV_QUAL_LEN); | |
769 | } | |
770 | ||
771 | memset(&iwe, 0, sizeof(iwe)); | |
772 | iwe.cmd = SIOCGIWENCODE; | |
773 | if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) | |
774 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; | |
775 | else | |
776 | iwe.u.data.flags = IW_ENCODE_DISABLED; | |
777 | iwe.u.data.length = 0; | |
778 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
779 | &iwe, ""); | |
780 | ||
781 | while (rem >= 2) { | |
782 | /* invalid data */ | |
783 | if (ie[1] > rem - 2) | |
784 | break; | |
785 | ||
786 | switch (ie[0]) { | |
787 | case WLAN_EID_SSID: | |
788 | memset(&iwe, 0, sizeof(iwe)); | |
789 | iwe.cmd = SIOCGIWESSID; | |
790 | iwe.u.data.length = ie[1]; | |
791 | iwe.u.data.flags = 1; | |
792 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
793 | &iwe, ie + 2); | |
794 | break; | |
795 | case WLAN_EID_MESH_ID: | |
796 | memset(&iwe, 0, sizeof(iwe)); | |
797 | iwe.cmd = SIOCGIWESSID; | |
798 | iwe.u.data.length = ie[1]; | |
799 | iwe.u.data.flags = 1; | |
800 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
801 | &iwe, ie + 2); | |
802 | break; | |
803 | case WLAN_EID_MESH_CONFIG: | |
804 | ismesh = true; | |
805 | if (ie[1] != IEEE80211_MESH_CONFIG_LEN) | |
806 | break; | |
807 | buf = kmalloc(50, GFP_ATOMIC); | |
808 | if (!buf) | |
809 | break; | |
810 | cfg = ie + 2; | |
811 | memset(&iwe, 0, sizeof(iwe)); | |
812 | iwe.cmd = IWEVCUSTOM; | |
813 | sprintf(buf, "Mesh network (version %d)", cfg[0]); | |
814 | iwe.u.data.length = strlen(buf); | |
815 | current_ev = iwe_stream_add_point(info, current_ev, | |
816 | end_buf, | |
817 | &iwe, buf); | |
818 | sprintf(buf, "Path Selection Protocol ID: " | |
819 | "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3], | |
820 | cfg[4]); | |
821 | iwe.u.data.length = strlen(buf); | |
822 | current_ev = iwe_stream_add_point(info, current_ev, | |
823 | end_buf, | |
824 | &iwe, buf); | |
825 | sprintf(buf, "Path Selection Metric ID: " | |
826 | "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7], | |
827 | cfg[8]); | |
828 | iwe.u.data.length = strlen(buf); | |
829 | current_ev = iwe_stream_add_point(info, current_ev, | |
830 | end_buf, | |
831 | &iwe, buf); | |
832 | sprintf(buf, "Congestion Control Mode ID: " | |
833 | "0x%02X%02X%02X%02X", cfg[9], cfg[10], | |
834 | cfg[11], cfg[12]); | |
835 | iwe.u.data.length = strlen(buf); | |
836 | current_ev = iwe_stream_add_point(info, current_ev, | |
837 | end_buf, | |
838 | &iwe, buf); | |
839 | sprintf(buf, "Channel Precedence: " | |
840 | "0x%02X%02X%02X%02X", cfg[13], cfg[14], | |
841 | cfg[15], cfg[16]); | |
842 | iwe.u.data.length = strlen(buf); | |
843 | current_ev = iwe_stream_add_point(info, current_ev, | |
844 | end_buf, | |
845 | &iwe, buf); | |
846 | kfree(buf); | |
847 | break; | |
848 | case WLAN_EID_SUPP_RATES: | |
849 | case WLAN_EID_EXT_SUPP_RATES: | |
850 | /* display all supported rates in readable format */ | |
851 | p = current_ev + iwe_stream_lcp_len(info); | |
852 | ||
853 | memset(&iwe, 0, sizeof(iwe)); | |
854 | iwe.cmd = SIOCGIWRATE; | |
855 | /* Those two flags are ignored... */ | |
856 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; | |
857 | ||
858 | for (i = 0; i < ie[1]; i++) { | |
859 | iwe.u.bitrate.value = | |
860 | ((ie[i + 2] & 0x7f) * 500000); | |
861 | p = iwe_stream_add_value(info, current_ev, p, | |
862 | end_buf, &iwe, IW_EV_PARAM_LEN); | |
863 | } | |
864 | current_ev = p; | |
865 | break; | |
866 | } | |
867 | rem -= ie[1] + 2; | |
868 | ie += ie[1] + 2; | |
869 | } | |
870 | ||
871 | if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) | |
872 | || ismesh) { | |
873 | memset(&iwe, 0, sizeof(iwe)); | |
874 | iwe.cmd = SIOCGIWMODE; | |
875 | if (ismesh) | |
876 | iwe.u.mode = IW_MODE_MESH; | |
877 | else if (bss->pub.capability & WLAN_CAPABILITY_ESS) | |
878 | iwe.u.mode = IW_MODE_MASTER; | |
879 | else | |
880 | iwe.u.mode = IW_MODE_ADHOC; | |
881 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
882 | &iwe, IW_EV_UINT_LEN); | |
883 | } | |
884 | ||
885 | buf = kmalloc(30, GFP_ATOMIC); | |
886 | if (buf) { | |
887 | memset(&iwe, 0, sizeof(iwe)); | |
888 | iwe.cmd = IWEVCUSTOM; | |
889 | sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf)); | |
890 | iwe.u.data.length = strlen(buf); | |
891 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
892 | &iwe, buf); | |
893 | memset(&iwe, 0, sizeof(iwe)); | |
894 | iwe.cmd = IWEVCUSTOM; | |
cb3a8eec DW |
895 | sprintf(buf, " Last beacon: %ums ago", |
896 | elapsed_jiffies_msecs(bss->ts)); | |
2a519311 JB |
897 | iwe.u.data.length = strlen(buf); |
898 | current_ev = iwe_stream_add_point(info, current_ev, | |
899 | end_buf, &iwe, buf); | |
900 | kfree(buf); | |
901 | } | |
902 | ||
903 | ieee80211_scan_add_ies(info, &bss->pub, ¤t_ev, end_buf); | |
904 | ||
905 | return current_ev; | |
906 | } | |
907 | ||
908 | ||
909 | static int ieee80211_scan_results(struct cfg80211_registered_device *dev, | |
910 | struct iw_request_info *info, | |
911 | char *buf, size_t len) | |
912 | { | |
913 | char *current_ev = buf; | |
914 | char *end_buf = buf + len; | |
915 | struct cfg80211_internal_bss *bss; | |
916 | ||
917 | spin_lock_bh(&dev->bss_lock); | |
918 | cfg80211_bss_expire(dev); | |
919 | ||
920 | list_for_each_entry(bss, &dev->bss_list, list) { | |
921 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { | |
922 | spin_unlock_bh(&dev->bss_lock); | |
923 | return -E2BIG; | |
924 | } | |
77965c97 JB |
925 | current_ev = ieee80211_bss(&dev->wiphy, info, bss, |
926 | current_ev, end_buf); | |
2a519311 JB |
927 | } |
928 | spin_unlock_bh(&dev->bss_lock); | |
929 | return current_ev - buf; | |
930 | } | |
931 | ||
932 | ||
933 | int cfg80211_wext_giwscan(struct net_device *dev, | |
934 | struct iw_request_info *info, | |
935 | struct iw_point *data, char *extra) | |
936 | { | |
937 | struct cfg80211_registered_device *rdev; | |
938 | int res; | |
939 | ||
940 | if (!netif_running(dev)) | |
941 | return -ENETDOWN; | |
942 | ||
463d0183 | 943 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
944 | |
945 | if (IS_ERR(rdev)) | |
946 | return PTR_ERR(rdev); | |
947 | ||
948 | if (rdev->scan_req) { | |
949 | res = -EAGAIN; | |
950 | goto out; | |
951 | } | |
952 | ||
953 | res = ieee80211_scan_results(rdev, info, extra, data->length); | |
954 | data->length = 0; | |
955 | if (res >= 0) { | |
956 | data->length = res; | |
957 | res = 0; | |
958 | } | |
959 | ||
960 | out: | |
4d0c8aea | 961 | cfg80211_unlock_rdev(rdev); |
2a519311 JB |
962 | return res; |
963 | } | |
ba44cb72 | 964 | EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan); |
2a519311 | 965 | #endif |