Commit | Line | Data |
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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 | ||
20 | void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted) | |
21 | { | |
22 | struct net_device *dev; | |
23 | #ifdef CONFIG_WIRELESS_EXT | |
24 | union iwreq_data wrqu; | |
25 | #endif | |
26 | ||
27 | dev = dev_get_by_index(&init_net, request->ifidx); | |
28 | if (!dev) | |
29 | goto out; | |
30 | ||
31 | WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req); | |
32 | wiphy_to_dev(request->wiphy)->scan_req = NULL; | |
33 | ||
34 | if (aborted) | |
35 | nl80211_send_scan_aborted(wiphy_to_dev(request->wiphy), dev); | |
36 | else | |
37 | nl80211_send_scan_done(wiphy_to_dev(request->wiphy), dev); | |
38 | ||
39 | #ifdef CONFIG_WIRELESS_EXT | |
40 | if (!aborted) { | |
41 | memset(&wrqu, 0, sizeof(wrqu)); | |
42 | ||
43 | wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL); | |
44 | } | |
45 | #endif | |
46 | ||
47 | dev_put(dev); | |
48 | ||
49 | out: | |
50 | kfree(request); | |
51 | } | |
52 | EXPORT_SYMBOL(cfg80211_scan_done); | |
53 | ||
54 | static void bss_release(struct kref *ref) | |
55 | { | |
56 | struct cfg80211_internal_bss *bss; | |
57 | ||
58 | bss = container_of(ref, struct cfg80211_internal_bss, ref); | |
78c1c7e1 JB |
59 | if (bss->pub.free_priv) |
60 | bss->pub.free_priv(&bss->pub); | |
cd1658f5 JB |
61 | |
62 | if (bss->ies_allocated) | |
63 | kfree(bss->pub.information_elements); | |
64 | ||
2a519311 JB |
65 | kfree(bss); |
66 | } | |
67 | ||
cb3a8eec DW |
68 | /* must hold dev->bss_lock! */ |
69 | void cfg80211_bss_age(struct cfg80211_registered_device *dev, | |
70 | unsigned long age_secs) | |
71 | { | |
72 | struct cfg80211_internal_bss *bss; | |
73 | unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); | |
74 | ||
75 | list_for_each_entry(bss, &dev->bss_list, list) { | |
76 | bss->ts -= age_jiffies; | |
77 | } | |
78 | } | |
79 | ||
2a519311 JB |
80 | /* must hold dev->bss_lock! */ |
81 | void cfg80211_bss_expire(struct cfg80211_registered_device *dev) | |
82 | { | |
83 | struct cfg80211_internal_bss *bss, *tmp; | |
84 | bool expired = false; | |
85 | ||
86 | list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) { | |
a08c1c1a KV |
87 | if (bss->hold || |
88 | !time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE)) | |
2a519311 JB |
89 | continue; |
90 | list_del(&bss->list); | |
91 | rb_erase(&bss->rbn, &dev->bss_tree); | |
92 | kref_put(&bss->ref, bss_release); | |
93 | expired = true; | |
94 | } | |
95 | ||
96 | if (expired) | |
97 | dev->bss_generation++; | |
98 | } | |
99 | ||
100 | static u8 *find_ie(u8 num, u8 *ies, size_t len) | |
101 | { | |
102 | while (len > 2 && ies[0] != num) { | |
103 | len -= ies[1] + 2; | |
104 | ies += ies[1] + 2; | |
105 | } | |
106 | if (len < 2) | |
107 | return NULL; | |
108 | if (len < 2 + ies[1]) | |
109 | return NULL; | |
110 | return ies; | |
111 | } | |
112 | ||
113 | static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2) | |
114 | { | |
115 | const u8 *ie1 = find_ie(num, ies1, len1); | |
116 | const u8 *ie2 = find_ie(num, ies2, len2); | |
117 | int r; | |
118 | ||
119 | if (!ie1 && !ie2) | |
120 | return 0; | |
121 | if (!ie1) | |
122 | return -1; | |
123 | ||
124 | r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1])); | |
125 | if (r == 0 && ie1[1] != ie2[1]) | |
126 | return ie2[1] - ie1[1]; | |
127 | return r; | |
128 | } | |
129 | ||
130 | static bool is_bss(struct cfg80211_bss *a, | |
131 | const u8 *bssid, | |
132 | const u8 *ssid, size_t ssid_len) | |
133 | { | |
134 | const u8 *ssidie; | |
135 | ||
79420f09 | 136 | if (bssid && compare_ether_addr(a->bssid, bssid)) |
2a519311 JB |
137 | return false; |
138 | ||
79420f09 JB |
139 | if (!ssid) |
140 | return true; | |
141 | ||
2a519311 JB |
142 | ssidie = find_ie(WLAN_EID_SSID, |
143 | a->information_elements, | |
144 | a->len_information_elements); | |
145 | if (!ssidie) | |
146 | return false; | |
147 | if (ssidie[1] != ssid_len) | |
148 | return false; | |
149 | return memcmp(ssidie + 2, ssid, ssid_len) == 0; | |
150 | } | |
151 | ||
152 | static bool is_mesh(struct cfg80211_bss *a, | |
153 | const u8 *meshid, size_t meshidlen, | |
154 | const u8 *meshcfg) | |
155 | { | |
156 | const u8 *ie; | |
157 | ||
158 | if (!is_zero_ether_addr(a->bssid)) | |
159 | return false; | |
160 | ||
161 | ie = find_ie(WLAN_EID_MESH_ID, | |
162 | a->information_elements, | |
163 | a->len_information_elements); | |
164 | if (!ie) | |
165 | return false; | |
166 | if (ie[1] != meshidlen) | |
167 | return false; | |
168 | if (memcmp(ie + 2, meshid, meshidlen)) | |
169 | return false; | |
170 | ||
171 | ie = find_ie(WLAN_EID_MESH_CONFIG, | |
172 | a->information_elements, | |
173 | a->len_information_elements); | |
174 | if (ie[1] != IEEE80211_MESH_CONFIG_LEN) | |
175 | return false; | |
176 | ||
177 | /* | |
178 | * Ignore mesh capability (last two bytes of the IE) when | |
179 | * comparing since that may differ between stations taking | |
180 | * part in the same mesh. | |
181 | */ | |
182 | return memcmp(ie + 2, meshcfg, IEEE80211_MESH_CONFIG_LEN - 2) == 0; | |
183 | } | |
184 | ||
185 | static int cmp_bss(struct cfg80211_bss *a, | |
186 | struct cfg80211_bss *b) | |
187 | { | |
188 | int r; | |
189 | ||
190 | if (a->channel != b->channel) | |
191 | return b->channel->center_freq - a->channel->center_freq; | |
192 | ||
193 | r = memcmp(a->bssid, b->bssid, ETH_ALEN); | |
194 | if (r) | |
195 | return r; | |
196 | ||
197 | if (is_zero_ether_addr(a->bssid)) { | |
198 | r = cmp_ies(WLAN_EID_MESH_ID, | |
199 | a->information_elements, | |
200 | a->len_information_elements, | |
201 | b->information_elements, | |
202 | b->len_information_elements); | |
203 | if (r) | |
204 | return r; | |
205 | return cmp_ies(WLAN_EID_MESH_CONFIG, | |
206 | a->information_elements, | |
207 | a->len_information_elements, | |
208 | b->information_elements, | |
209 | b->len_information_elements); | |
210 | } | |
211 | ||
212 | return cmp_ies(WLAN_EID_SSID, | |
213 | a->information_elements, | |
214 | a->len_information_elements, | |
215 | b->information_elements, | |
216 | b->len_information_elements); | |
217 | } | |
218 | ||
219 | struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, | |
220 | struct ieee80211_channel *channel, | |
221 | const u8 *bssid, | |
79420f09 JB |
222 | const u8 *ssid, size_t ssid_len, |
223 | u16 capa_mask, u16 capa_val) | |
2a519311 JB |
224 | { |
225 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
226 | struct cfg80211_internal_bss *bss, *res = NULL; | |
227 | ||
228 | spin_lock_bh(&dev->bss_lock); | |
229 | ||
230 | list_for_each_entry(bss, &dev->bss_list, list) { | |
79420f09 JB |
231 | if ((bss->pub.capability & capa_mask) != capa_val) |
232 | continue; | |
2a519311 JB |
233 | if (channel && bss->pub.channel != channel) |
234 | continue; | |
235 | if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { | |
236 | res = bss; | |
237 | kref_get(&res->ref); | |
238 | break; | |
239 | } | |
240 | } | |
241 | ||
242 | spin_unlock_bh(&dev->bss_lock); | |
243 | if (!res) | |
244 | return NULL; | |
245 | return &res->pub; | |
246 | } | |
247 | EXPORT_SYMBOL(cfg80211_get_bss); | |
248 | ||
249 | struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy, | |
250 | struct ieee80211_channel *channel, | |
251 | const u8 *meshid, size_t meshidlen, | |
252 | const u8 *meshcfg) | |
253 | { | |
254 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
255 | struct cfg80211_internal_bss *bss, *res = NULL; | |
256 | ||
257 | spin_lock_bh(&dev->bss_lock); | |
258 | ||
259 | list_for_each_entry(bss, &dev->bss_list, list) { | |
260 | if (channel && bss->pub.channel != channel) | |
261 | continue; | |
262 | if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) { | |
263 | res = bss; | |
264 | kref_get(&res->ref); | |
265 | break; | |
266 | } | |
267 | } | |
268 | ||
269 | spin_unlock_bh(&dev->bss_lock); | |
270 | if (!res) | |
271 | return NULL; | |
272 | return &res->pub; | |
273 | } | |
274 | EXPORT_SYMBOL(cfg80211_get_mesh); | |
275 | ||
276 | ||
277 | static void rb_insert_bss(struct cfg80211_registered_device *dev, | |
278 | struct cfg80211_internal_bss *bss) | |
279 | { | |
280 | struct rb_node **p = &dev->bss_tree.rb_node; | |
281 | struct rb_node *parent = NULL; | |
282 | struct cfg80211_internal_bss *tbss; | |
283 | int cmp; | |
284 | ||
285 | while (*p) { | |
286 | parent = *p; | |
287 | tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); | |
288 | ||
289 | cmp = cmp_bss(&bss->pub, &tbss->pub); | |
290 | ||
291 | if (WARN_ON(!cmp)) { | |
292 | /* will sort of leak this BSS */ | |
293 | return; | |
294 | } | |
295 | ||
296 | if (cmp < 0) | |
297 | p = &(*p)->rb_left; | |
298 | else | |
299 | p = &(*p)->rb_right; | |
300 | } | |
301 | ||
302 | rb_link_node(&bss->rbn, parent, p); | |
303 | rb_insert_color(&bss->rbn, &dev->bss_tree); | |
304 | } | |
305 | ||
306 | static struct cfg80211_internal_bss * | |
307 | rb_find_bss(struct cfg80211_registered_device *dev, | |
308 | struct cfg80211_internal_bss *res) | |
309 | { | |
310 | struct rb_node *n = dev->bss_tree.rb_node; | |
311 | struct cfg80211_internal_bss *bss; | |
312 | int r; | |
313 | ||
314 | while (n) { | |
315 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); | |
316 | r = cmp_bss(&res->pub, &bss->pub); | |
317 | ||
318 | if (r == 0) | |
319 | return bss; | |
320 | else if (r < 0) | |
321 | n = n->rb_left; | |
322 | else | |
323 | n = n->rb_right; | |
324 | } | |
325 | ||
326 | return NULL; | |
327 | } | |
328 | ||
329 | static struct cfg80211_internal_bss * | |
330 | cfg80211_bss_update(struct cfg80211_registered_device *dev, | |
331 | struct cfg80211_internal_bss *res, | |
332 | bool overwrite) | |
333 | { | |
334 | struct cfg80211_internal_bss *found = NULL; | |
335 | const u8 *meshid, *meshcfg; | |
336 | ||
337 | /* | |
338 | * The reference to "res" is donated to this function. | |
339 | */ | |
340 | ||
341 | if (WARN_ON(!res->pub.channel)) { | |
342 | kref_put(&res->ref, bss_release); | |
343 | return NULL; | |
344 | } | |
345 | ||
346 | res->ts = jiffies; | |
347 | ||
348 | if (is_zero_ether_addr(res->pub.bssid)) { | |
349 | /* must be mesh, verify */ | |
350 | meshid = find_ie(WLAN_EID_MESH_ID, res->pub.information_elements, | |
351 | res->pub.len_information_elements); | |
352 | meshcfg = find_ie(WLAN_EID_MESH_CONFIG, | |
353 | res->pub.information_elements, | |
354 | res->pub.len_information_elements); | |
355 | if (!meshid || !meshcfg || | |
356 | meshcfg[1] != IEEE80211_MESH_CONFIG_LEN) { | |
357 | /* bogus mesh */ | |
358 | kref_put(&res->ref, bss_release); | |
359 | return NULL; | |
360 | } | |
361 | } | |
362 | ||
363 | spin_lock_bh(&dev->bss_lock); | |
364 | ||
365 | found = rb_find_bss(dev, res); | |
366 | ||
cd1658f5 | 367 | if (found) { |
2a519311 JB |
368 | kref_get(&found->ref); |
369 | found->pub.beacon_interval = res->pub.beacon_interval; | |
370 | found->pub.tsf = res->pub.tsf; | |
371 | found->pub.signal = res->pub.signal; | |
2a519311 JB |
372 | found->pub.capability = res->pub.capability; |
373 | found->ts = res->ts; | |
cd1658f5 JB |
374 | |
375 | /* overwrite IEs */ | |
376 | if (overwrite) { | |
377 | size_t used = dev->wiphy.bss_priv_size + sizeof(*res); | |
378 | size_t ielen = res->pub.len_information_elements; | |
379 | ||
380 | if (ksize(found) >= used + ielen) { | |
381 | memcpy(found->pub.information_elements, | |
382 | res->pub.information_elements, ielen); | |
383 | found->pub.len_information_elements = ielen; | |
384 | } else { | |
385 | u8 *ies = found->pub.information_elements; | |
386 | ||
387 | if (found->ies_allocated) { | |
388 | if (ksize(ies) < ielen) | |
389 | ies = krealloc(ies, ielen, | |
390 | GFP_ATOMIC); | |
391 | } else | |
392 | ies = kmalloc(ielen, GFP_ATOMIC); | |
393 | ||
394 | if (ies) { | |
395 | memcpy(ies, res->pub.information_elements, ielen); | |
396 | found->ies_allocated = true; | |
397 | found->pub.information_elements = ies; | |
398 | } | |
399 | } | |
400 | } | |
401 | ||
2a519311 JB |
402 | kref_put(&res->ref, bss_release); |
403 | } else { | |
404 | /* this "consumes" the reference */ | |
405 | list_add_tail(&res->list, &dev->bss_list); | |
406 | rb_insert_bss(dev, res); | |
407 | found = res; | |
408 | } | |
409 | ||
410 | dev->bss_generation++; | |
411 | spin_unlock_bh(&dev->bss_lock); | |
412 | ||
413 | kref_get(&found->ref); | |
414 | return found; | |
415 | } | |
416 | ||
06aa7afa JK |
417 | struct cfg80211_bss* |
418 | cfg80211_inform_bss(struct wiphy *wiphy, | |
419 | struct ieee80211_channel *channel, | |
420 | const u8 *bssid, | |
421 | u64 timestamp, u16 capability, u16 beacon_interval, | |
422 | const u8 *ie, size_t ielen, | |
423 | s32 signal, gfp_t gfp) | |
424 | { | |
425 | struct cfg80211_internal_bss *res; | |
426 | size_t privsz; | |
427 | ||
428 | if (WARN_ON(!wiphy)) | |
429 | return NULL; | |
430 | ||
431 | privsz = wiphy->bss_priv_size; | |
432 | ||
433 | if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC && | |
434 | (signal < 0 || signal > 100))) | |
435 | return NULL; | |
436 | ||
437 | res = kzalloc(sizeof(*res) + privsz + ielen, gfp); | |
438 | if (!res) | |
439 | return NULL; | |
440 | ||
441 | memcpy(res->pub.bssid, bssid, ETH_ALEN); | |
442 | res->pub.channel = channel; | |
443 | res->pub.signal = signal; | |
444 | res->pub.tsf = timestamp; | |
445 | res->pub.beacon_interval = beacon_interval; | |
446 | res->pub.capability = capability; | |
447 | /* point to after the private area */ | |
448 | res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz; | |
449 | memcpy(res->pub.information_elements, ie, ielen); | |
450 | res->pub.len_information_elements = ielen; | |
451 | ||
452 | kref_init(&res->ref); | |
453 | ||
454 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, 0); | |
455 | if (!res) | |
456 | return NULL; | |
457 | ||
458 | if (res->pub.capability & WLAN_CAPABILITY_ESS) | |
459 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
460 | ||
461 | /* cfg80211_bss_update gives us a referenced result */ | |
462 | return &res->pub; | |
463 | } | |
464 | EXPORT_SYMBOL(cfg80211_inform_bss); | |
465 | ||
2a519311 JB |
466 | struct cfg80211_bss * |
467 | cfg80211_inform_bss_frame(struct wiphy *wiphy, | |
468 | struct ieee80211_channel *channel, | |
469 | struct ieee80211_mgmt *mgmt, size_t len, | |
77965c97 | 470 | s32 signal, gfp_t gfp) |
2a519311 JB |
471 | { |
472 | struct cfg80211_internal_bss *res; | |
473 | size_t ielen = len - offsetof(struct ieee80211_mgmt, | |
474 | u.probe_resp.variable); | |
475 | bool overwrite; | |
476 | size_t privsz = wiphy->bss_priv_size; | |
477 | ||
77965c97 | 478 | if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC && |
2a519311 JB |
479 | (signal < 0 || signal > 100))) |
480 | return NULL; | |
481 | ||
482 | if (WARN_ON(!mgmt || !wiphy || | |
483 | len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) | |
484 | return NULL; | |
485 | ||
486 | res = kzalloc(sizeof(*res) + privsz + ielen, gfp); | |
487 | if (!res) | |
488 | return NULL; | |
489 | ||
490 | memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN); | |
491 | res->pub.channel = channel; | |
2a519311 JB |
492 | res->pub.signal = signal; |
493 | res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); | |
494 | res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); | |
495 | res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); | |
496 | /* point to after the private area */ | |
497 | res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz; | |
498 | memcpy(res->pub.information_elements, mgmt->u.probe_resp.variable, ielen); | |
499 | res->pub.len_information_elements = ielen; | |
500 | ||
501 | kref_init(&res->ref); | |
502 | ||
503 | overwrite = ieee80211_is_probe_resp(mgmt->frame_control); | |
504 | ||
505 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, overwrite); | |
506 | if (!res) | |
507 | return NULL; | |
508 | ||
e38f8a7a LR |
509 | if (res->pub.capability & WLAN_CAPABILITY_ESS) |
510 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
511 | ||
2a519311 JB |
512 | /* cfg80211_bss_update gives us a referenced result */ |
513 | return &res->pub; | |
514 | } | |
515 | EXPORT_SYMBOL(cfg80211_inform_bss_frame); | |
516 | ||
517 | void cfg80211_put_bss(struct cfg80211_bss *pub) | |
518 | { | |
519 | struct cfg80211_internal_bss *bss; | |
520 | ||
521 | if (!pub) | |
522 | return; | |
523 | ||
524 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
525 | kref_put(&bss->ref, bss_release); | |
526 | } | |
527 | EXPORT_SYMBOL(cfg80211_put_bss); | |
528 | ||
d491af19 JB |
529 | void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
530 | { | |
531 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
532 | struct cfg80211_internal_bss *bss; | |
533 | ||
534 | if (WARN_ON(!pub)) | |
535 | return; | |
536 | ||
537 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
538 | ||
539 | spin_lock_bh(&dev->bss_lock); | |
540 | ||
541 | list_del(&bss->list); | |
542 | rb_erase(&bss->rbn, &dev->bss_tree); | |
543 | ||
544 | spin_unlock_bh(&dev->bss_lock); | |
545 | ||
546 | kref_put(&bss->ref, bss_release); | |
547 | } | |
548 | EXPORT_SYMBOL(cfg80211_unlink_bss); | |
549 | ||
a08c1c1a KV |
550 | void cfg80211_hold_bss(struct cfg80211_bss *pub) |
551 | { | |
552 | struct cfg80211_internal_bss *bss; | |
553 | ||
554 | if (!pub) | |
555 | return; | |
556 | ||
557 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
558 | bss->hold = true; | |
559 | } | |
560 | EXPORT_SYMBOL(cfg80211_hold_bss); | |
561 | ||
562 | void cfg80211_unhold_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 | bss->hold = false; | |
571 | } | |
572 | EXPORT_SYMBOL(cfg80211_unhold_bss); | |
573 | ||
2a519311 JB |
574 | #ifdef CONFIG_WIRELESS_EXT |
575 | int cfg80211_wext_siwscan(struct net_device *dev, | |
576 | struct iw_request_info *info, | |
577 | union iwreq_data *wrqu, char *extra) | |
578 | { | |
579 | struct cfg80211_registered_device *rdev; | |
580 | struct wiphy *wiphy; | |
581 | struct iw_scan_req *wreq = NULL; | |
582 | struct cfg80211_scan_request *creq; | |
583 | int i, err, n_channels = 0; | |
584 | enum ieee80211_band band; | |
585 | ||
586 | if (!netif_running(dev)) | |
587 | return -ENETDOWN; | |
588 | ||
589 | rdev = cfg80211_get_dev_from_ifindex(dev->ifindex); | |
590 | ||
591 | if (IS_ERR(rdev)) | |
592 | return PTR_ERR(rdev); | |
593 | ||
594 | if (rdev->scan_req) { | |
595 | err = -EBUSY; | |
596 | goto out; | |
597 | } | |
598 | ||
599 | wiphy = &rdev->wiphy; | |
600 | ||
601 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) | |
602 | if (wiphy->bands[band]) | |
603 | n_channels += wiphy->bands[band]->n_channels; | |
604 | ||
605 | creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + | |
606 | n_channels * sizeof(void *), | |
607 | GFP_ATOMIC); | |
608 | if (!creq) { | |
609 | err = -ENOMEM; | |
610 | goto out; | |
611 | } | |
612 | ||
613 | creq->wiphy = wiphy; | |
614 | creq->ifidx = dev->ifindex; | |
615 | creq->ssids = (void *)(creq + 1); | |
616 | creq->channels = (void *)(creq->ssids + 1); | |
617 | creq->n_channels = n_channels; | |
618 | creq->n_ssids = 1; | |
619 | ||
620 | /* all channels */ | |
621 | i = 0; | |
622 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
623 | int j; | |
624 | if (!wiphy->bands[band]) | |
625 | continue; | |
626 | for (j = 0; j < wiphy->bands[band]->n_channels; j++) { | |
627 | creq->channels[i] = &wiphy->bands[band]->channels[j]; | |
628 | i++; | |
629 | } | |
630 | } | |
631 | ||
632 | /* translate scan request */ | |
633 | if (wrqu->data.length == sizeof(struct iw_scan_req)) { | |
634 | wreq = (struct iw_scan_req *)extra; | |
635 | ||
636 | if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { | |
637 | if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) | |
638 | return -EINVAL; | |
639 | memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); | |
640 | creq->ssids[0].ssid_len = wreq->essid_len; | |
641 | } | |
642 | if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) | |
643 | creq->n_ssids = 0; | |
644 | } | |
645 | ||
646 | rdev->scan_req = creq; | |
647 | err = rdev->ops->scan(wiphy, dev, creq); | |
648 | if (err) { | |
649 | rdev->scan_req = NULL; | |
650 | kfree(creq); | |
651 | } | |
652 | out: | |
653 | cfg80211_put_dev(rdev); | |
654 | return err; | |
655 | } | |
ba44cb72 | 656 | EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan); |
2a519311 JB |
657 | |
658 | static void ieee80211_scan_add_ies(struct iw_request_info *info, | |
659 | struct cfg80211_bss *bss, | |
660 | char **current_ev, char *end_buf) | |
661 | { | |
662 | u8 *pos, *end, *next; | |
663 | struct iw_event iwe; | |
664 | ||
665 | if (!bss->information_elements || | |
666 | !bss->len_information_elements) | |
667 | return; | |
668 | ||
669 | /* | |
670 | * If needed, fragment the IEs buffer (at IE boundaries) into short | |
671 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. | |
672 | */ | |
673 | pos = bss->information_elements; | |
674 | end = pos + bss->len_information_elements; | |
675 | ||
676 | while (end - pos > IW_GENERIC_IE_MAX) { | |
677 | next = pos + 2 + pos[1]; | |
678 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) | |
679 | next = next + 2 + next[1]; | |
680 | ||
681 | memset(&iwe, 0, sizeof(iwe)); | |
682 | iwe.cmd = IWEVGENIE; | |
683 | iwe.u.data.length = next - pos; | |
684 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
685 | end_buf, &iwe, pos); | |
686 | ||
687 | pos = next; | |
688 | } | |
689 | ||
690 | if (end > pos) { | |
691 | memset(&iwe, 0, sizeof(iwe)); | |
692 | iwe.cmd = IWEVGENIE; | |
693 | iwe.u.data.length = end - pos; | |
694 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
695 | end_buf, &iwe, pos); | |
696 | } | |
697 | } | |
698 | ||
cb3a8eec DW |
699 | static inline unsigned int elapsed_jiffies_msecs(unsigned long start) |
700 | { | |
701 | unsigned long end = jiffies; | |
702 | ||
703 | if (end >= start) | |
704 | return jiffies_to_msecs(end - start); | |
705 | ||
706 | return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1); | |
707 | } | |
2a519311 JB |
708 | |
709 | static char * | |
77965c97 JB |
710 | ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, |
711 | struct cfg80211_internal_bss *bss, char *current_ev, | |
712 | char *end_buf) | |
2a519311 JB |
713 | { |
714 | struct iw_event iwe; | |
715 | u8 *buf, *cfg, *p; | |
716 | u8 *ie = bss->pub.information_elements; | |
a77b8552 | 717 | int rem = bss->pub.len_information_elements, i, sig; |
2a519311 JB |
718 | bool ismesh = false; |
719 | ||
720 | memset(&iwe, 0, sizeof(iwe)); | |
721 | iwe.cmd = SIOCGIWAP; | |
722 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; | |
723 | memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); | |
724 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
725 | IW_EV_ADDR_LEN); | |
726 | ||
727 | memset(&iwe, 0, sizeof(iwe)); | |
728 | iwe.cmd = SIOCGIWFREQ; | |
729 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); | |
730 | iwe.u.freq.e = 0; | |
731 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
732 | IW_EV_FREQ_LEN); | |
733 | ||
734 | memset(&iwe, 0, sizeof(iwe)); | |
735 | iwe.cmd = SIOCGIWFREQ; | |
736 | iwe.u.freq.m = bss->pub.channel->center_freq; | |
737 | iwe.u.freq.e = 6; | |
738 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
739 | IW_EV_FREQ_LEN); | |
740 | ||
77965c97 | 741 | if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { |
2a519311 JB |
742 | memset(&iwe, 0, sizeof(iwe)); |
743 | iwe.cmd = IWEVQUAL; | |
744 | iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | | |
745 | IW_QUAL_NOISE_INVALID | | |
a77b8552 | 746 | IW_QUAL_QUAL_UPDATED; |
77965c97 | 747 | switch (wiphy->signal_type) { |
2a519311 | 748 | case CFG80211_SIGNAL_TYPE_MBM: |
a77b8552 JB |
749 | sig = bss->pub.signal / 100; |
750 | iwe.u.qual.level = sig; | |
2a519311 | 751 | iwe.u.qual.updated |= IW_QUAL_DBM; |
a77b8552 JB |
752 | if (sig < -110) /* rather bad */ |
753 | sig = -110; | |
754 | else if (sig > -40) /* perfect */ | |
755 | sig = -40; | |
756 | /* will give a range of 0 .. 70 */ | |
757 | iwe.u.qual.qual = sig + 110; | |
2a519311 JB |
758 | break; |
759 | case CFG80211_SIGNAL_TYPE_UNSPEC: | |
760 | iwe.u.qual.level = bss->pub.signal; | |
a77b8552 JB |
761 | /* will give range 0 .. 100 */ |
762 | iwe.u.qual.qual = bss->pub.signal; | |
2a519311 JB |
763 | break; |
764 | default: | |
765 | /* not reached */ | |
766 | break; | |
767 | } | |
768 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
769 | &iwe, IW_EV_QUAL_LEN); | |
770 | } | |
771 | ||
772 | memset(&iwe, 0, sizeof(iwe)); | |
773 | iwe.cmd = SIOCGIWENCODE; | |
774 | if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) | |
775 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; | |
776 | else | |
777 | iwe.u.data.flags = IW_ENCODE_DISABLED; | |
778 | iwe.u.data.length = 0; | |
779 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
780 | &iwe, ""); | |
781 | ||
782 | while (rem >= 2) { | |
783 | /* invalid data */ | |
784 | if (ie[1] > rem - 2) | |
785 | break; | |
786 | ||
787 | switch (ie[0]) { | |
788 | case WLAN_EID_SSID: | |
789 | memset(&iwe, 0, sizeof(iwe)); | |
790 | iwe.cmd = SIOCGIWESSID; | |
791 | iwe.u.data.length = ie[1]; | |
792 | iwe.u.data.flags = 1; | |
793 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
794 | &iwe, ie + 2); | |
795 | break; | |
796 | case WLAN_EID_MESH_ID: | |
797 | memset(&iwe, 0, sizeof(iwe)); | |
798 | iwe.cmd = SIOCGIWESSID; | |
799 | iwe.u.data.length = ie[1]; | |
800 | iwe.u.data.flags = 1; | |
801 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
802 | &iwe, ie + 2); | |
803 | break; | |
804 | case WLAN_EID_MESH_CONFIG: | |
805 | ismesh = true; | |
806 | if (ie[1] != IEEE80211_MESH_CONFIG_LEN) | |
807 | break; | |
808 | buf = kmalloc(50, GFP_ATOMIC); | |
809 | if (!buf) | |
810 | break; | |
811 | cfg = ie + 2; | |
812 | memset(&iwe, 0, sizeof(iwe)); | |
813 | iwe.cmd = IWEVCUSTOM; | |
814 | sprintf(buf, "Mesh network (version %d)", cfg[0]); | |
815 | iwe.u.data.length = strlen(buf); | |
816 | current_ev = iwe_stream_add_point(info, current_ev, | |
817 | end_buf, | |
818 | &iwe, buf); | |
819 | sprintf(buf, "Path Selection Protocol ID: " | |
820 | "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3], | |
821 | cfg[4]); | |
822 | iwe.u.data.length = strlen(buf); | |
823 | current_ev = iwe_stream_add_point(info, current_ev, | |
824 | end_buf, | |
825 | &iwe, buf); | |
826 | sprintf(buf, "Path Selection Metric ID: " | |
827 | "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7], | |
828 | cfg[8]); | |
829 | iwe.u.data.length = strlen(buf); | |
830 | current_ev = iwe_stream_add_point(info, current_ev, | |
831 | end_buf, | |
832 | &iwe, buf); | |
833 | sprintf(buf, "Congestion Control Mode ID: " | |
834 | "0x%02X%02X%02X%02X", cfg[9], cfg[10], | |
835 | cfg[11], cfg[12]); | |
836 | iwe.u.data.length = strlen(buf); | |
837 | current_ev = iwe_stream_add_point(info, current_ev, | |
838 | end_buf, | |
839 | &iwe, buf); | |
840 | sprintf(buf, "Channel Precedence: " | |
841 | "0x%02X%02X%02X%02X", cfg[13], cfg[14], | |
842 | cfg[15], cfg[16]); | |
843 | iwe.u.data.length = strlen(buf); | |
844 | current_ev = iwe_stream_add_point(info, current_ev, | |
845 | end_buf, | |
846 | &iwe, buf); | |
847 | kfree(buf); | |
848 | break; | |
849 | case WLAN_EID_SUPP_RATES: | |
850 | case WLAN_EID_EXT_SUPP_RATES: | |
851 | /* display all supported rates in readable format */ | |
852 | p = current_ev + iwe_stream_lcp_len(info); | |
853 | ||
854 | memset(&iwe, 0, sizeof(iwe)); | |
855 | iwe.cmd = SIOCGIWRATE; | |
856 | /* Those two flags are ignored... */ | |
857 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; | |
858 | ||
859 | for (i = 0; i < ie[1]; i++) { | |
860 | iwe.u.bitrate.value = | |
861 | ((ie[i + 2] & 0x7f) * 500000); | |
862 | p = iwe_stream_add_value(info, current_ev, p, | |
863 | end_buf, &iwe, IW_EV_PARAM_LEN); | |
864 | } | |
865 | current_ev = p; | |
866 | break; | |
867 | } | |
868 | rem -= ie[1] + 2; | |
869 | ie += ie[1] + 2; | |
870 | } | |
871 | ||
872 | if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) | |
873 | || ismesh) { | |
874 | memset(&iwe, 0, sizeof(iwe)); | |
875 | iwe.cmd = SIOCGIWMODE; | |
876 | if (ismesh) | |
877 | iwe.u.mode = IW_MODE_MESH; | |
878 | else if (bss->pub.capability & WLAN_CAPABILITY_ESS) | |
879 | iwe.u.mode = IW_MODE_MASTER; | |
880 | else | |
881 | iwe.u.mode = IW_MODE_ADHOC; | |
882 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
883 | &iwe, IW_EV_UINT_LEN); | |
884 | } | |
885 | ||
886 | buf = kmalloc(30, GFP_ATOMIC); | |
887 | if (buf) { | |
888 | memset(&iwe, 0, sizeof(iwe)); | |
889 | iwe.cmd = IWEVCUSTOM; | |
890 | sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf)); | |
891 | iwe.u.data.length = strlen(buf); | |
892 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
893 | &iwe, buf); | |
894 | memset(&iwe, 0, sizeof(iwe)); | |
895 | iwe.cmd = IWEVCUSTOM; | |
cb3a8eec DW |
896 | sprintf(buf, " Last beacon: %ums ago", |
897 | elapsed_jiffies_msecs(bss->ts)); | |
2a519311 JB |
898 | iwe.u.data.length = strlen(buf); |
899 | current_ev = iwe_stream_add_point(info, current_ev, | |
900 | end_buf, &iwe, buf); | |
901 | kfree(buf); | |
902 | } | |
903 | ||
904 | ieee80211_scan_add_ies(info, &bss->pub, ¤t_ev, end_buf); | |
905 | ||
906 | return current_ev; | |
907 | } | |
908 | ||
909 | ||
910 | static int ieee80211_scan_results(struct cfg80211_registered_device *dev, | |
911 | struct iw_request_info *info, | |
912 | char *buf, size_t len) | |
913 | { | |
914 | char *current_ev = buf; | |
915 | char *end_buf = buf + len; | |
916 | struct cfg80211_internal_bss *bss; | |
917 | ||
918 | spin_lock_bh(&dev->bss_lock); | |
919 | cfg80211_bss_expire(dev); | |
920 | ||
921 | list_for_each_entry(bss, &dev->bss_list, list) { | |
922 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { | |
923 | spin_unlock_bh(&dev->bss_lock); | |
924 | return -E2BIG; | |
925 | } | |
77965c97 JB |
926 | current_ev = ieee80211_bss(&dev->wiphy, info, bss, |
927 | current_ev, end_buf); | |
2a519311 JB |
928 | } |
929 | spin_unlock_bh(&dev->bss_lock); | |
930 | return current_ev - buf; | |
931 | } | |
932 | ||
933 | ||
934 | int cfg80211_wext_giwscan(struct net_device *dev, | |
935 | struct iw_request_info *info, | |
936 | struct iw_point *data, char *extra) | |
937 | { | |
938 | struct cfg80211_registered_device *rdev; | |
939 | int res; | |
940 | ||
941 | if (!netif_running(dev)) | |
942 | return -ENETDOWN; | |
943 | ||
944 | rdev = cfg80211_get_dev_from_ifindex(dev->ifindex); | |
945 | ||
946 | if (IS_ERR(rdev)) | |
947 | return PTR_ERR(rdev); | |
948 | ||
949 | if (rdev->scan_req) { | |
950 | res = -EAGAIN; | |
951 | goto out; | |
952 | } | |
953 | ||
954 | res = ieee80211_scan_results(rdev, info, extra, data->length); | |
955 | data->length = 0; | |
956 | if (res >= 0) { | |
957 | data->length = res; | |
958 | res = 0; | |
959 | } | |
960 | ||
961 | out: | |
962 | cfg80211_put_dev(rdev); | |
963 | return res; | |
964 | } | |
ba44cb72 | 965 | EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan); |
2a519311 | 966 | #endif |