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 | ||
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); | |
2a519311 | 32 | |
6829c878 JB |
33 | /* |
34 | * This must be before sending the other events! | |
35 | * Otherwise, wpa_supplicant gets completely confused with | |
36 | * wext events. | |
37 | */ | |
38 | cfg80211_sme_scan_done(dev); | |
39 | ||
2a519311 JB |
40 | if (aborted) |
41 | nl80211_send_scan_aborted(wiphy_to_dev(request->wiphy), dev); | |
42 | else | |
43 | nl80211_send_scan_done(wiphy_to_dev(request->wiphy), dev); | |
44 | ||
362a415d JB |
45 | wiphy_to_dev(request->wiphy)->scan_req = NULL; |
46 | ||
2a519311 JB |
47 | #ifdef CONFIG_WIRELESS_EXT |
48 | if (!aborted) { | |
49 | memset(&wrqu, 0, sizeof(wrqu)); | |
50 | ||
51 | wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL); | |
52 | } | |
53 | #endif | |
54 | ||
55 | dev_put(dev); | |
56 | ||
57 | out: | |
58 | kfree(request); | |
59 | } | |
60 | EXPORT_SYMBOL(cfg80211_scan_done); | |
61 | ||
62 | static void bss_release(struct kref *ref) | |
63 | { | |
64 | struct cfg80211_internal_bss *bss; | |
65 | ||
66 | bss = container_of(ref, struct cfg80211_internal_bss, ref); | |
78c1c7e1 JB |
67 | if (bss->pub.free_priv) |
68 | bss->pub.free_priv(&bss->pub); | |
cd1658f5 JB |
69 | |
70 | if (bss->ies_allocated) | |
71 | kfree(bss->pub.information_elements); | |
72 | ||
2a519311 JB |
73 | kfree(bss); |
74 | } | |
75 | ||
cb3a8eec DW |
76 | /* must hold dev->bss_lock! */ |
77 | void cfg80211_bss_age(struct cfg80211_registered_device *dev, | |
78 | unsigned long age_secs) | |
79 | { | |
80 | struct cfg80211_internal_bss *bss; | |
81 | unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); | |
82 | ||
83 | list_for_each_entry(bss, &dev->bss_list, list) { | |
84 | bss->ts -= age_jiffies; | |
85 | } | |
86 | } | |
87 | ||
2a519311 JB |
88 | /* must hold dev->bss_lock! */ |
89 | void cfg80211_bss_expire(struct cfg80211_registered_device *dev) | |
90 | { | |
91 | struct cfg80211_internal_bss *bss, *tmp; | |
92 | bool expired = false; | |
93 | ||
94 | list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) { | |
a08c1c1a KV |
95 | if (bss->hold || |
96 | !time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE)) | |
2a519311 JB |
97 | continue; |
98 | list_del(&bss->list); | |
99 | rb_erase(&bss->rbn, &dev->bss_tree); | |
100 | kref_put(&bss->ref, bss_release); | |
101 | expired = true; | |
102 | } | |
103 | ||
104 | if (expired) | |
105 | dev->bss_generation++; | |
106 | } | |
107 | ||
108 | static u8 *find_ie(u8 num, u8 *ies, size_t len) | |
109 | { | |
110 | while (len > 2 && ies[0] != num) { | |
111 | len -= ies[1] + 2; | |
112 | ies += ies[1] + 2; | |
113 | } | |
114 | if (len < 2) | |
115 | return NULL; | |
116 | if (len < 2 + ies[1]) | |
117 | return NULL; | |
118 | return ies; | |
119 | } | |
120 | ||
121 | static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2) | |
122 | { | |
123 | const u8 *ie1 = find_ie(num, ies1, len1); | |
124 | const u8 *ie2 = find_ie(num, ies2, len2); | |
125 | int r; | |
126 | ||
127 | if (!ie1 && !ie2) | |
128 | return 0; | |
129 | if (!ie1) | |
130 | return -1; | |
131 | ||
132 | r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1])); | |
133 | if (r == 0 && ie1[1] != ie2[1]) | |
134 | return ie2[1] - ie1[1]; | |
135 | return r; | |
136 | } | |
137 | ||
138 | static bool is_bss(struct cfg80211_bss *a, | |
139 | const u8 *bssid, | |
140 | const u8 *ssid, size_t ssid_len) | |
141 | { | |
142 | const u8 *ssidie; | |
143 | ||
79420f09 | 144 | if (bssid && compare_ether_addr(a->bssid, bssid)) |
2a519311 JB |
145 | return false; |
146 | ||
79420f09 JB |
147 | if (!ssid) |
148 | return true; | |
149 | ||
2a519311 JB |
150 | ssidie = find_ie(WLAN_EID_SSID, |
151 | a->information_elements, | |
152 | a->len_information_elements); | |
153 | if (!ssidie) | |
154 | return false; | |
155 | if (ssidie[1] != ssid_len) | |
156 | return false; | |
157 | return memcmp(ssidie + 2, ssid, ssid_len) == 0; | |
158 | } | |
159 | ||
160 | static bool is_mesh(struct cfg80211_bss *a, | |
161 | const u8 *meshid, size_t meshidlen, | |
162 | const u8 *meshcfg) | |
163 | { | |
164 | const u8 *ie; | |
165 | ||
166 | if (!is_zero_ether_addr(a->bssid)) | |
167 | return false; | |
168 | ||
169 | ie = find_ie(WLAN_EID_MESH_ID, | |
170 | a->information_elements, | |
171 | a->len_information_elements); | |
172 | if (!ie) | |
173 | return false; | |
174 | if (ie[1] != meshidlen) | |
175 | return false; | |
176 | if (memcmp(ie + 2, meshid, meshidlen)) | |
177 | return false; | |
178 | ||
179 | ie = find_ie(WLAN_EID_MESH_CONFIG, | |
180 | a->information_elements, | |
181 | a->len_information_elements); | |
182 | if (ie[1] != IEEE80211_MESH_CONFIG_LEN) | |
183 | return false; | |
184 | ||
185 | /* | |
186 | * Ignore mesh capability (last two bytes of the IE) when | |
187 | * comparing since that may differ between stations taking | |
188 | * part in the same mesh. | |
189 | */ | |
190 | return memcmp(ie + 2, meshcfg, IEEE80211_MESH_CONFIG_LEN - 2) == 0; | |
191 | } | |
192 | ||
193 | static int cmp_bss(struct cfg80211_bss *a, | |
194 | struct cfg80211_bss *b) | |
195 | { | |
196 | int r; | |
197 | ||
198 | if (a->channel != b->channel) | |
199 | return b->channel->center_freq - a->channel->center_freq; | |
200 | ||
201 | r = memcmp(a->bssid, b->bssid, ETH_ALEN); | |
202 | if (r) | |
203 | return r; | |
204 | ||
205 | if (is_zero_ether_addr(a->bssid)) { | |
206 | r = cmp_ies(WLAN_EID_MESH_ID, | |
207 | a->information_elements, | |
208 | a->len_information_elements, | |
209 | b->information_elements, | |
210 | b->len_information_elements); | |
211 | if (r) | |
212 | return r; | |
213 | return cmp_ies(WLAN_EID_MESH_CONFIG, | |
214 | a->information_elements, | |
215 | a->len_information_elements, | |
216 | b->information_elements, | |
217 | b->len_information_elements); | |
218 | } | |
219 | ||
220 | return cmp_ies(WLAN_EID_SSID, | |
221 | a->information_elements, | |
222 | a->len_information_elements, | |
223 | b->information_elements, | |
224 | b->len_information_elements); | |
225 | } | |
226 | ||
227 | struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, | |
228 | struct ieee80211_channel *channel, | |
229 | const u8 *bssid, | |
79420f09 JB |
230 | const u8 *ssid, size_t ssid_len, |
231 | u16 capa_mask, u16 capa_val) | |
2a519311 JB |
232 | { |
233 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
234 | struct cfg80211_internal_bss *bss, *res = NULL; | |
235 | ||
236 | spin_lock_bh(&dev->bss_lock); | |
237 | ||
238 | list_for_each_entry(bss, &dev->bss_list, list) { | |
79420f09 JB |
239 | if ((bss->pub.capability & capa_mask) != capa_val) |
240 | continue; | |
2a519311 JB |
241 | if (channel && bss->pub.channel != channel) |
242 | continue; | |
243 | if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { | |
244 | res = bss; | |
245 | kref_get(&res->ref); | |
246 | break; | |
247 | } | |
248 | } | |
249 | ||
250 | spin_unlock_bh(&dev->bss_lock); | |
251 | if (!res) | |
252 | return NULL; | |
253 | return &res->pub; | |
254 | } | |
255 | EXPORT_SYMBOL(cfg80211_get_bss); | |
256 | ||
257 | struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy, | |
258 | struct ieee80211_channel *channel, | |
259 | const u8 *meshid, size_t meshidlen, | |
260 | const u8 *meshcfg) | |
261 | { | |
262 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
263 | struct cfg80211_internal_bss *bss, *res = NULL; | |
264 | ||
265 | spin_lock_bh(&dev->bss_lock); | |
266 | ||
267 | list_for_each_entry(bss, &dev->bss_list, list) { | |
268 | if (channel && bss->pub.channel != channel) | |
269 | continue; | |
270 | if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) { | |
271 | res = bss; | |
272 | kref_get(&res->ref); | |
273 | break; | |
274 | } | |
275 | } | |
276 | ||
277 | spin_unlock_bh(&dev->bss_lock); | |
278 | if (!res) | |
279 | return NULL; | |
280 | return &res->pub; | |
281 | } | |
282 | EXPORT_SYMBOL(cfg80211_get_mesh); | |
283 | ||
284 | ||
285 | static void rb_insert_bss(struct cfg80211_registered_device *dev, | |
286 | struct cfg80211_internal_bss *bss) | |
287 | { | |
288 | struct rb_node **p = &dev->bss_tree.rb_node; | |
289 | struct rb_node *parent = NULL; | |
290 | struct cfg80211_internal_bss *tbss; | |
291 | int cmp; | |
292 | ||
293 | while (*p) { | |
294 | parent = *p; | |
295 | tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); | |
296 | ||
297 | cmp = cmp_bss(&bss->pub, &tbss->pub); | |
298 | ||
299 | if (WARN_ON(!cmp)) { | |
300 | /* will sort of leak this BSS */ | |
301 | return; | |
302 | } | |
303 | ||
304 | if (cmp < 0) | |
305 | p = &(*p)->rb_left; | |
306 | else | |
307 | p = &(*p)->rb_right; | |
308 | } | |
309 | ||
310 | rb_link_node(&bss->rbn, parent, p); | |
311 | rb_insert_color(&bss->rbn, &dev->bss_tree); | |
312 | } | |
313 | ||
314 | static struct cfg80211_internal_bss * | |
315 | rb_find_bss(struct cfg80211_registered_device *dev, | |
316 | struct cfg80211_internal_bss *res) | |
317 | { | |
318 | struct rb_node *n = dev->bss_tree.rb_node; | |
319 | struct cfg80211_internal_bss *bss; | |
320 | int r; | |
321 | ||
322 | while (n) { | |
323 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); | |
324 | r = cmp_bss(&res->pub, &bss->pub); | |
325 | ||
326 | if (r == 0) | |
327 | return bss; | |
328 | else if (r < 0) | |
329 | n = n->rb_left; | |
330 | else | |
331 | n = n->rb_right; | |
332 | } | |
333 | ||
334 | return NULL; | |
335 | } | |
336 | ||
337 | static struct cfg80211_internal_bss * | |
338 | cfg80211_bss_update(struct cfg80211_registered_device *dev, | |
339 | struct cfg80211_internal_bss *res, | |
340 | bool overwrite) | |
341 | { | |
342 | struct cfg80211_internal_bss *found = NULL; | |
343 | const u8 *meshid, *meshcfg; | |
344 | ||
345 | /* | |
346 | * The reference to "res" is donated to this function. | |
347 | */ | |
348 | ||
349 | if (WARN_ON(!res->pub.channel)) { | |
350 | kref_put(&res->ref, bss_release); | |
351 | return NULL; | |
352 | } | |
353 | ||
354 | res->ts = jiffies; | |
355 | ||
356 | if (is_zero_ether_addr(res->pub.bssid)) { | |
357 | /* must be mesh, verify */ | |
358 | meshid = find_ie(WLAN_EID_MESH_ID, res->pub.information_elements, | |
359 | res->pub.len_information_elements); | |
360 | meshcfg = find_ie(WLAN_EID_MESH_CONFIG, | |
361 | res->pub.information_elements, | |
362 | res->pub.len_information_elements); | |
363 | if (!meshid || !meshcfg || | |
364 | meshcfg[1] != IEEE80211_MESH_CONFIG_LEN) { | |
365 | /* bogus mesh */ | |
366 | kref_put(&res->ref, bss_release); | |
367 | return NULL; | |
368 | } | |
369 | } | |
370 | ||
371 | spin_lock_bh(&dev->bss_lock); | |
372 | ||
373 | found = rb_find_bss(dev, res); | |
374 | ||
cd1658f5 | 375 | if (found) { |
2a519311 JB |
376 | found->pub.beacon_interval = res->pub.beacon_interval; |
377 | found->pub.tsf = res->pub.tsf; | |
378 | found->pub.signal = res->pub.signal; | |
2a519311 JB |
379 | found->pub.capability = res->pub.capability; |
380 | found->ts = res->ts; | |
cd1658f5 JB |
381 | |
382 | /* overwrite IEs */ | |
383 | if (overwrite) { | |
384 | size_t used = dev->wiphy.bss_priv_size + sizeof(*res); | |
385 | size_t ielen = res->pub.len_information_elements; | |
386 | ||
44e1b98f | 387 | if (!found->ies_allocated && ksize(found) >= used + ielen) { |
cd1658f5 JB |
388 | memcpy(found->pub.information_elements, |
389 | res->pub.information_elements, ielen); | |
390 | found->pub.len_information_elements = ielen; | |
391 | } else { | |
392 | u8 *ies = found->pub.information_elements; | |
393 | ||
273de92c MB |
394 | if (found->ies_allocated) |
395 | ies = krealloc(ies, ielen, GFP_ATOMIC); | |
396 | else | |
cd1658f5 JB |
397 | ies = kmalloc(ielen, GFP_ATOMIC); |
398 | ||
399 | if (ies) { | |
400 | memcpy(ies, res->pub.information_elements, ielen); | |
401 | found->ies_allocated = true; | |
402 | found->pub.information_elements = ies; | |
c0f0aac0 | 403 | found->pub.len_information_elements = ielen; |
cd1658f5 JB |
404 | } |
405 | } | |
406 | } | |
407 | ||
2a519311 JB |
408 | kref_put(&res->ref, bss_release); |
409 | } else { | |
410 | /* this "consumes" the reference */ | |
411 | list_add_tail(&res->list, &dev->bss_list); | |
412 | rb_insert_bss(dev, res); | |
413 | found = res; | |
414 | } | |
415 | ||
416 | dev->bss_generation++; | |
417 | spin_unlock_bh(&dev->bss_lock); | |
418 | ||
419 | kref_get(&found->ref); | |
420 | return found; | |
421 | } | |
422 | ||
06aa7afa JK |
423 | struct cfg80211_bss* |
424 | cfg80211_inform_bss(struct wiphy *wiphy, | |
425 | struct ieee80211_channel *channel, | |
426 | const u8 *bssid, | |
427 | u64 timestamp, u16 capability, u16 beacon_interval, | |
428 | const u8 *ie, size_t ielen, | |
429 | s32 signal, gfp_t gfp) | |
430 | { | |
431 | struct cfg80211_internal_bss *res; | |
432 | size_t privsz; | |
433 | ||
434 | if (WARN_ON(!wiphy)) | |
435 | return NULL; | |
436 | ||
437 | privsz = wiphy->bss_priv_size; | |
438 | ||
439 | if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC && | |
440 | (signal < 0 || signal > 100))) | |
441 | return NULL; | |
442 | ||
443 | res = kzalloc(sizeof(*res) + privsz + ielen, gfp); | |
444 | if (!res) | |
445 | return NULL; | |
446 | ||
447 | memcpy(res->pub.bssid, bssid, ETH_ALEN); | |
448 | res->pub.channel = channel; | |
449 | res->pub.signal = signal; | |
450 | res->pub.tsf = timestamp; | |
451 | res->pub.beacon_interval = beacon_interval; | |
452 | res->pub.capability = capability; | |
453 | /* point to after the private area */ | |
454 | res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz; | |
455 | memcpy(res->pub.information_elements, ie, ielen); | |
456 | res->pub.len_information_elements = ielen; | |
457 | ||
458 | kref_init(&res->ref); | |
459 | ||
460 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, 0); | |
461 | if (!res) | |
462 | return NULL; | |
463 | ||
464 | if (res->pub.capability & WLAN_CAPABILITY_ESS) | |
465 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
466 | ||
467 | /* cfg80211_bss_update gives us a referenced result */ | |
468 | return &res->pub; | |
469 | } | |
470 | EXPORT_SYMBOL(cfg80211_inform_bss); | |
471 | ||
2a519311 JB |
472 | struct cfg80211_bss * |
473 | cfg80211_inform_bss_frame(struct wiphy *wiphy, | |
474 | struct ieee80211_channel *channel, | |
475 | struct ieee80211_mgmt *mgmt, size_t len, | |
77965c97 | 476 | s32 signal, gfp_t gfp) |
2a519311 JB |
477 | { |
478 | struct cfg80211_internal_bss *res; | |
479 | size_t ielen = len - offsetof(struct ieee80211_mgmt, | |
480 | u.probe_resp.variable); | |
481 | bool overwrite; | |
482 | size_t privsz = wiphy->bss_priv_size; | |
483 | ||
77965c97 | 484 | if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC && |
2a519311 JB |
485 | (signal < 0 || signal > 100))) |
486 | return NULL; | |
487 | ||
488 | if (WARN_ON(!mgmt || !wiphy || | |
489 | len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) | |
490 | return NULL; | |
491 | ||
492 | res = kzalloc(sizeof(*res) + privsz + ielen, gfp); | |
493 | if (!res) | |
494 | return NULL; | |
495 | ||
496 | memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN); | |
497 | res->pub.channel = channel; | |
2a519311 JB |
498 | res->pub.signal = signal; |
499 | res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); | |
500 | res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); | |
501 | res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); | |
502 | /* point to after the private area */ | |
503 | res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz; | |
504 | memcpy(res->pub.information_elements, mgmt->u.probe_resp.variable, ielen); | |
505 | res->pub.len_information_elements = ielen; | |
506 | ||
507 | kref_init(&res->ref); | |
508 | ||
509 | overwrite = ieee80211_is_probe_resp(mgmt->frame_control); | |
510 | ||
511 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, overwrite); | |
512 | if (!res) | |
513 | return NULL; | |
514 | ||
e38f8a7a LR |
515 | if (res->pub.capability & WLAN_CAPABILITY_ESS) |
516 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
517 | ||
2a519311 JB |
518 | /* cfg80211_bss_update gives us a referenced result */ |
519 | return &res->pub; | |
520 | } | |
521 | EXPORT_SYMBOL(cfg80211_inform_bss_frame); | |
522 | ||
523 | void cfg80211_put_bss(struct cfg80211_bss *pub) | |
524 | { | |
525 | struct cfg80211_internal_bss *bss; | |
526 | ||
527 | if (!pub) | |
528 | return; | |
529 | ||
530 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
531 | kref_put(&bss->ref, bss_release); | |
532 | } | |
533 | EXPORT_SYMBOL(cfg80211_put_bss); | |
534 | ||
d491af19 JB |
535 | void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
536 | { | |
537 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
538 | struct cfg80211_internal_bss *bss; | |
539 | ||
540 | if (WARN_ON(!pub)) | |
541 | return; | |
542 | ||
543 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
544 | ||
545 | spin_lock_bh(&dev->bss_lock); | |
546 | ||
547 | list_del(&bss->list); | |
548 | rb_erase(&bss->rbn, &dev->bss_tree); | |
549 | ||
550 | spin_unlock_bh(&dev->bss_lock); | |
551 | ||
552 | kref_put(&bss->ref, bss_release); | |
553 | } | |
554 | EXPORT_SYMBOL(cfg80211_unlink_bss); | |
555 | ||
a08c1c1a KV |
556 | void cfg80211_hold_bss(struct cfg80211_bss *pub) |
557 | { | |
558 | struct cfg80211_internal_bss *bss; | |
559 | ||
560 | if (!pub) | |
561 | return; | |
562 | ||
563 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
564 | bss->hold = true; | |
565 | } | |
566 | EXPORT_SYMBOL(cfg80211_hold_bss); | |
567 | ||
568 | void cfg80211_unhold_bss(struct cfg80211_bss *pub) | |
569 | { | |
570 | struct cfg80211_internal_bss *bss; | |
571 | ||
572 | if (!pub) | |
573 | return; | |
574 | ||
575 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
576 | bss->hold = false; | |
577 | } | |
578 | EXPORT_SYMBOL(cfg80211_unhold_bss); | |
579 | ||
2a519311 JB |
580 | #ifdef CONFIG_WIRELESS_EXT |
581 | int cfg80211_wext_siwscan(struct net_device *dev, | |
582 | struct iw_request_info *info, | |
583 | union iwreq_data *wrqu, char *extra) | |
584 | { | |
585 | struct cfg80211_registered_device *rdev; | |
586 | struct wiphy *wiphy; | |
587 | struct iw_scan_req *wreq = NULL; | |
588 | struct cfg80211_scan_request *creq; | |
589 | int i, err, n_channels = 0; | |
590 | enum ieee80211_band band; | |
591 | ||
592 | if (!netif_running(dev)) | |
593 | return -ENETDOWN; | |
594 | ||
595 | rdev = cfg80211_get_dev_from_ifindex(dev->ifindex); | |
596 | ||
597 | if (IS_ERR(rdev)) | |
598 | return PTR_ERR(rdev); | |
599 | ||
600 | if (rdev->scan_req) { | |
601 | err = -EBUSY; | |
602 | goto out; | |
603 | } | |
604 | ||
605 | wiphy = &rdev->wiphy; | |
606 | ||
607 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) | |
608 | if (wiphy->bands[band]) | |
609 | n_channels += wiphy->bands[band]->n_channels; | |
610 | ||
611 | creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + | |
612 | n_channels * sizeof(void *), | |
613 | GFP_ATOMIC); | |
614 | if (!creq) { | |
615 | err = -ENOMEM; | |
616 | goto out; | |
617 | } | |
618 | ||
619 | creq->wiphy = wiphy; | |
620 | creq->ifidx = dev->ifindex; | |
621 | creq->ssids = (void *)(creq + 1); | |
622 | creq->channels = (void *)(creq->ssids + 1); | |
623 | creq->n_channels = n_channels; | |
624 | creq->n_ssids = 1; | |
625 | ||
626 | /* all channels */ | |
627 | i = 0; | |
628 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
629 | int j; | |
630 | if (!wiphy->bands[band]) | |
631 | continue; | |
632 | for (j = 0; j < wiphy->bands[band]->n_channels; j++) { | |
633 | creq->channels[i] = &wiphy->bands[band]->channels[j]; | |
634 | i++; | |
635 | } | |
636 | } | |
637 | ||
638 | /* translate scan request */ | |
639 | if (wrqu->data.length == sizeof(struct iw_scan_req)) { | |
640 | wreq = (struct iw_scan_req *)extra; | |
641 | ||
642 | if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { | |
643 | if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) | |
644 | return -EINVAL; | |
645 | memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); | |
646 | creq->ssids[0].ssid_len = wreq->essid_len; | |
647 | } | |
648 | if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) | |
649 | creq->n_ssids = 0; | |
650 | } | |
651 | ||
652 | rdev->scan_req = creq; | |
653 | err = rdev->ops->scan(wiphy, dev, creq); | |
654 | if (err) { | |
655 | rdev->scan_req = NULL; | |
656 | kfree(creq); | |
a538e2d5 JB |
657 | } else |
658 | nl80211_send_scan_start(rdev, dev); | |
2a519311 JB |
659 | out: |
660 | cfg80211_put_dev(rdev); | |
661 | return err; | |
662 | } | |
ba44cb72 | 663 | EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan); |
2a519311 JB |
664 | |
665 | static void ieee80211_scan_add_ies(struct iw_request_info *info, | |
666 | struct cfg80211_bss *bss, | |
667 | char **current_ev, char *end_buf) | |
668 | { | |
669 | u8 *pos, *end, *next; | |
670 | struct iw_event iwe; | |
671 | ||
672 | if (!bss->information_elements || | |
673 | !bss->len_information_elements) | |
674 | return; | |
675 | ||
676 | /* | |
677 | * If needed, fragment the IEs buffer (at IE boundaries) into short | |
678 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. | |
679 | */ | |
680 | pos = bss->information_elements; | |
681 | end = pos + bss->len_information_elements; | |
682 | ||
683 | while (end - pos > IW_GENERIC_IE_MAX) { | |
684 | next = pos + 2 + pos[1]; | |
685 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) | |
686 | next = next + 2 + next[1]; | |
687 | ||
688 | memset(&iwe, 0, sizeof(iwe)); | |
689 | iwe.cmd = IWEVGENIE; | |
690 | iwe.u.data.length = next - pos; | |
691 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
692 | end_buf, &iwe, pos); | |
693 | ||
694 | pos = next; | |
695 | } | |
696 | ||
697 | if (end > pos) { | |
698 | memset(&iwe, 0, sizeof(iwe)); | |
699 | iwe.cmd = IWEVGENIE; | |
700 | iwe.u.data.length = end - pos; | |
701 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
702 | end_buf, &iwe, pos); | |
703 | } | |
704 | } | |
705 | ||
cb3a8eec DW |
706 | static inline unsigned int elapsed_jiffies_msecs(unsigned long start) |
707 | { | |
708 | unsigned long end = jiffies; | |
709 | ||
710 | if (end >= start) | |
711 | return jiffies_to_msecs(end - start); | |
712 | ||
713 | return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1); | |
714 | } | |
2a519311 JB |
715 | |
716 | static char * | |
77965c97 JB |
717 | ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, |
718 | struct cfg80211_internal_bss *bss, char *current_ev, | |
719 | char *end_buf) | |
2a519311 JB |
720 | { |
721 | struct iw_event iwe; | |
722 | u8 *buf, *cfg, *p; | |
723 | u8 *ie = bss->pub.information_elements; | |
a77b8552 | 724 | int rem = bss->pub.len_information_elements, i, sig; |
2a519311 JB |
725 | bool ismesh = false; |
726 | ||
727 | memset(&iwe, 0, sizeof(iwe)); | |
728 | iwe.cmd = SIOCGIWAP; | |
729 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; | |
730 | memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); | |
731 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
732 | IW_EV_ADDR_LEN); | |
733 | ||
734 | memset(&iwe, 0, sizeof(iwe)); | |
735 | iwe.cmd = SIOCGIWFREQ; | |
736 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); | |
737 | iwe.u.freq.e = 0; | |
738 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
739 | IW_EV_FREQ_LEN); | |
740 | ||
741 | memset(&iwe, 0, sizeof(iwe)); | |
742 | iwe.cmd = SIOCGIWFREQ; | |
743 | iwe.u.freq.m = bss->pub.channel->center_freq; | |
744 | iwe.u.freq.e = 6; | |
745 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
746 | IW_EV_FREQ_LEN); | |
747 | ||
77965c97 | 748 | if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { |
2a519311 JB |
749 | memset(&iwe, 0, sizeof(iwe)); |
750 | iwe.cmd = IWEVQUAL; | |
751 | iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | | |
752 | IW_QUAL_NOISE_INVALID | | |
a77b8552 | 753 | IW_QUAL_QUAL_UPDATED; |
77965c97 | 754 | switch (wiphy->signal_type) { |
2a519311 | 755 | case CFG80211_SIGNAL_TYPE_MBM: |
a77b8552 JB |
756 | sig = bss->pub.signal / 100; |
757 | iwe.u.qual.level = sig; | |
2a519311 | 758 | iwe.u.qual.updated |= IW_QUAL_DBM; |
a77b8552 JB |
759 | if (sig < -110) /* rather bad */ |
760 | sig = -110; | |
761 | else if (sig > -40) /* perfect */ | |
762 | sig = -40; | |
763 | /* will give a range of 0 .. 70 */ | |
764 | iwe.u.qual.qual = sig + 110; | |
2a519311 JB |
765 | break; |
766 | case CFG80211_SIGNAL_TYPE_UNSPEC: | |
767 | iwe.u.qual.level = bss->pub.signal; | |
a77b8552 JB |
768 | /* will give range 0 .. 100 */ |
769 | iwe.u.qual.qual = bss->pub.signal; | |
2a519311 JB |
770 | break; |
771 | default: | |
772 | /* not reached */ | |
773 | break; | |
774 | } | |
775 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
776 | &iwe, IW_EV_QUAL_LEN); | |
777 | } | |
778 | ||
779 | memset(&iwe, 0, sizeof(iwe)); | |
780 | iwe.cmd = SIOCGIWENCODE; | |
781 | if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) | |
782 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; | |
783 | else | |
784 | iwe.u.data.flags = IW_ENCODE_DISABLED; | |
785 | iwe.u.data.length = 0; | |
786 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
787 | &iwe, ""); | |
788 | ||
789 | while (rem >= 2) { | |
790 | /* invalid data */ | |
791 | if (ie[1] > rem - 2) | |
792 | break; | |
793 | ||
794 | switch (ie[0]) { | |
795 | case WLAN_EID_SSID: | |
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_ID: | |
804 | memset(&iwe, 0, sizeof(iwe)); | |
805 | iwe.cmd = SIOCGIWESSID; | |
806 | iwe.u.data.length = ie[1]; | |
807 | iwe.u.data.flags = 1; | |
808 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
809 | &iwe, ie + 2); | |
810 | break; | |
811 | case WLAN_EID_MESH_CONFIG: | |
812 | ismesh = true; | |
813 | if (ie[1] != IEEE80211_MESH_CONFIG_LEN) | |
814 | break; | |
815 | buf = kmalloc(50, GFP_ATOMIC); | |
816 | if (!buf) | |
817 | break; | |
818 | cfg = ie + 2; | |
819 | memset(&iwe, 0, sizeof(iwe)); | |
820 | iwe.cmd = IWEVCUSTOM; | |
821 | sprintf(buf, "Mesh network (version %d)", cfg[0]); | |
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 Protocol ID: " | |
827 | "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3], | |
828 | cfg[4]); | |
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, "Path Selection Metric ID: " | |
834 | "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7], | |
835 | cfg[8]); | |
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, "Congestion Control Mode ID: " | |
841 | "0x%02X%02X%02X%02X", cfg[9], cfg[10], | |
842 | cfg[11], cfg[12]); | |
843 | iwe.u.data.length = strlen(buf); | |
844 | current_ev = iwe_stream_add_point(info, current_ev, | |
845 | end_buf, | |
846 | &iwe, buf); | |
847 | sprintf(buf, "Channel Precedence: " | |
848 | "0x%02X%02X%02X%02X", cfg[13], cfg[14], | |
849 | cfg[15], cfg[16]); | |
850 | iwe.u.data.length = strlen(buf); | |
851 | current_ev = iwe_stream_add_point(info, current_ev, | |
852 | end_buf, | |
853 | &iwe, buf); | |
854 | kfree(buf); | |
855 | break; | |
856 | case WLAN_EID_SUPP_RATES: | |
857 | case WLAN_EID_EXT_SUPP_RATES: | |
858 | /* display all supported rates in readable format */ | |
859 | p = current_ev + iwe_stream_lcp_len(info); | |
860 | ||
861 | memset(&iwe, 0, sizeof(iwe)); | |
862 | iwe.cmd = SIOCGIWRATE; | |
863 | /* Those two flags are ignored... */ | |
864 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; | |
865 | ||
866 | for (i = 0; i < ie[1]; i++) { | |
867 | iwe.u.bitrate.value = | |
868 | ((ie[i + 2] & 0x7f) * 500000); | |
869 | p = iwe_stream_add_value(info, current_ev, p, | |
870 | end_buf, &iwe, IW_EV_PARAM_LEN); | |
871 | } | |
872 | current_ev = p; | |
873 | break; | |
874 | } | |
875 | rem -= ie[1] + 2; | |
876 | ie += ie[1] + 2; | |
877 | } | |
878 | ||
879 | if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) | |
880 | || ismesh) { | |
881 | memset(&iwe, 0, sizeof(iwe)); | |
882 | iwe.cmd = SIOCGIWMODE; | |
883 | if (ismesh) | |
884 | iwe.u.mode = IW_MODE_MESH; | |
885 | else if (bss->pub.capability & WLAN_CAPABILITY_ESS) | |
886 | iwe.u.mode = IW_MODE_MASTER; | |
887 | else | |
888 | iwe.u.mode = IW_MODE_ADHOC; | |
889 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
890 | &iwe, IW_EV_UINT_LEN); | |
891 | } | |
892 | ||
893 | buf = kmalloc(30, GFP_ATOMIC); | |
894 | if (buf) { | |
895 | memset(&iwe, 0, sizeof(iwe)); | |
896 | iwe.cmd = IWEVCUSTOM; | |
897 | sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf)); | |
898 | iwe.u.data.length = strlen(buf); | |
899 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
900 | &iwe, buf); | |
901 | memset(&iwe, 0, sizeof(iwe)); | |
902 | iwe.cmd = IWEVCUSTOM; | |
cb3a8eec DW |
903 | sprintf(buf, " Last beacon: %ums ago", |
904 | elapsed_jiffies_msecs(bss->ts)); | |
2a519311 JB |
905 | iwe.u.data.length = strlen(buf); |
906 | current_ev = iwe_stream_add_point(info, current_ev, | |
907 | end_buf, &iwe, buf); | |
908 | kfree(buf); | |
909 | } | |
910 | ||
911 | ieee80211_scan_add_ies(info, &bss->pub, ¤t_ev, end_buf); | |
912 | ||
913 | return current_ev; | |
914 | } | |
915 | ||
916 | ||
917 | static int ieee80211_scan_results(struct cfg80211_registered_device *dev, | |
918 | struct iw_request_info *info, | |
919 | char *buf, size_t len) | |
920 | { | |
921 | char *current_ev = buf; | |
922 | char *end_buf = buf + len; | |
923 | struct cfg80211_internal_bss *bss; | |
924 | ||
925 | spin_lock_bh(&dev->bss_lock); | |
926 | cfg80211_bss_expire(dev); | |
927 | ||
928 | list_for_each_entry(bss, &dev->bss_list, list) { | |
929 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { | |
930 | spin_unlock_bh(&dev->bss_lock); | |
931 | return -E2BIG; | |
932 | } | |
77965c97 JB |
933 | current_ev = ieee80211_bss(&dev->wiphy, info, bss, |
934 | current_ev, end_buf); | |
2a519311 JB |
935 | } |
936 | spin_unlock_bh(&dev->bss_lock); | |
937 | return current_ev - buf; | |
938 | } | |
939 | ||
940 | ||
941 | int cfg80211_wext_giwscan(struct net_device *dev, | |
942 | struct iw_request_info *info, | |
943 | struct iw_point *data, char *extra) | |
944 | { | |
945 | struct cfg80211_registered_device *rdev; | |
946 | int res; | |
947 | ||
948 | if (!netif_running(dev)) | |
949 | return -ENETDOWN; | |
950 | ||
951 | rdev = cfg80211_get_dev_from_ifindex(dev->ifindex); | |
952 | ||
953 | if (IS_ERR(rdev)) | |
954 | return PTR_ERR(rdev); | |
955 | ||
956 | if (rdev->scan_req) { | |
957 | res = -EAGAIN; | |
958 | goto out; | |
959 | } | |
960 | ||
961 | res = ieee80211_scan_results(rdev, info, extra, data->length); | |
962 | data->length = 0; | |
963 | if (res >= 0) { | |
964 | data->length = res; | |
965 | res = 0; | |
966 | } | |
967 | ||
968 | out: | |
969 | cfg80211_put_dev(rdev); | |
970 | return res; | |
971 | } | |
ba44cb72 | 972 | EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan); |
2a519311 | 973 | #endif |