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1 | /* | |
2 | * cfg80211 scan result handling | |
3 | * | |
4 | * Copyright 2008 Johannes Berg <johannes@sipsolutions.net> | |
5 | */ | |
6 | #include <linux/kernel.h> | |
7 | #include <linux/slab.h> | |
8 | #include <linux/module.h> | |
9 | #include <linux/netdevice.h> | |
10 | #include <linux/wireless.h> | |
11 | #include <linux/nl80211.h> | |
12 | #include <linux/etherdevice.h> | |
13 | #include <net/arp.h> | |
14 | #include <net/cfg80211.h> | |
15 | #include <net/cfg80211-wext.h> | |
16 | #include <net/iw_handler.h> | |
17 | #include "core.h" | |
18 | #include "nl80211.h" | |
19 | #include "wext-compat.h" | |
20 | #include "rdev-ops.h" | |
21 | ||
22 | #define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ) | |
23 | ||
24 | static void bss_release(struct kref *ref) | |
25 | { | |
26 | struct cfg80211_bss_ies *ies; | |
27 | struct cfg80211_internal_bss *bss; | |
28 | ||
29 | bss = container_of(ref, struct cfg80211_internal_bss, ref); | |
30 | ||
31 | if (WARN_ON(atomic_read(&bss->hold))) | |
32 | return; | |
33 | ||
34 | ies = (void *)rcu_access_pointer(bss->pub.beacon_ies); | |
35 | if (ies) | |
36 | kfree_rcu(ies, rcu_head); | |
37 | ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies); | |
38 | if (ies) | |
39 | kfree_rcu(ies, rcu_head); | |
40 | ||
41 | kfree(bss); | |
42 | } | |
43 | ||
44 | /* must hold dev->bss_lock! */ | |
45 | static void __cfg80211_unlink_bss(struct cfg80211_registered_device *dev, | |
46 | struct cfg80211_internal_bss *bss) | |
47 | { | |
48 | list_del_init(&bss->list); | |
49 | rb_erase(&bss->rbn, &dev->bss_tree); | |
50 | kref_put(&bss->ref, bss_release); | |
51 | } | |
52 | ||
53 | /* must hold dev->bss_lock! */ | |
54 | static void __cfg80211_bss_expire(struct cfg80211_registered_device *dev, | |
55 | unsigned long expire_time) | |
56 | { | |
57 | struct cfg80211_internal_bss *bss, *tmp; | |
58 | bool expired = false; | |
59 | ||
60 | list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) { | |
61 | if (atomic_read(&bss->hold)) | |
62 | continue; | |
63 | if (!time_after(expire_time, bss->ts)) | |
64 | continue; | |
65 | ||
66 | __cfg80211_unlink_bss(dev, bss); | |
67 | expired = true; | |
68 | } | |
69 | ||
70 | if (expired) | |
71 | dev->bss_generation++; | |
72 | } | |
73 | ||
74 | void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak) | |
75 | { | |
76 | struct cfg80211_scan_request *request; | |
77 | struct wireless_dev *wdev; | |
78 | #ifdef CONFIG_CFG80211_WEXT | |
79 | union iwreq_data wrqu; | |
80 | #endif | |
81 | ||
82 | ASSERT_RDEV_LOCK(rdev); | |
83 | ||
84 | request = rdev->scan_req; | |
85 | ||
86 | if (!request) | |
87 | return; | |
88 | ||
89 | wdev = request->wdev; | |
90 | ||
91 | /* | |
92 | * This must be before sending the other events! | |
93 | * Otherwise, wpa_supplicant gets completely confused with | |
94 | * wext events. | |
95 | */ | |
96 | if (wdev->netdev) | |
97 | cfg80211_sme_scan_done(wdev->netdev); | |
98 | ||
99 | if (request->aborted) { | |
100 | nl80211_send_scan_aborted(rdev, wdev); | |
101 | } else { | |
102 | if (request->flags & NL80211_SCAN_FLAG_FLUSH) { | |
103 | /* flush entries from previous scans */ | |
104 | spin_lock_bh(&rdev->bss_lock); | |
105 | __cfg80211_bss_expire(rdev, request->scan_start); | |
106 | spin_unlock_bh(&rdev->bss_lock); | |
107 | } | |
108 | nl80211_send_scan_done(rdev, wdev); | |
109 | } | |
110 | ||
111 | #ifdef CONFIG_CFG80211_WEXT | |
112 | if (wdev->netdev && !request->aborted) { | |
113 | memset(&wrqu, 0, sizeof(wrqu)); | |
114 | ||
115 | wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL); | |
116 | } | |
117 | #endif | |
118 | ||
119 | if (wdev->netdev) | |
120 | dev_put(wdev->netdev); | |
121 | ||
122 | rdev->scan_req = NULL; | |
123 | ||
124 | /* | |
125 | * OK. If this is invoked with "leak" then we can't | |
126 | * free this ... but we've cleaned it up anyway. The | |
127 | * driver failed to call the scan_done callback, so | |
128 | * all bets are off, it might still be trying to use | |
129 | * the scan request or not ... if it accesses the dev | |
130 | * in there (it shouldn't anyway) then it may crash. | |
131 | */ | |
132 | if (!leak) | |
133 | kfree(request); | |
134 | } | |
135 | ||
136 | void __cfg80211_scan_done(struct work_struct *wk) | |
137 | { | |
138 | struct cfg80211_registered_device *rdev; | |
139 | ||
140 | rdev = container_of(wk, struct cfg80211_registered_device, | |
141 | scan_done_wk); | |
142 | ||
143 | cfg80211_lock_rdev(rdev); | |
144 | ___cfg80211_scan_done(rdev, false); | |
145 | cfg80211_unlock_rdev(rdev); | |
146 | } | |
147 | ||
148 | void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted) | |
149 | { | |
150 | trace_cfg80211_scan_done(request, aborted); | |
151 | WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req); | |
152 | ||
153 | request->aborted = aborted; | |
154 | queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk); | |
155 | } | |
156 | EXPORT_SYMBOL(cfg80211_scan_done); | |
157 | ||
158 | void __cfg80211_sched_scan_results(struct work_struct *wk) | |
159 | { | |
160 | struct cfg80211_registered_device *rdev; | |
161 | struct cfg80211_sched_scan_request *request; | |
162 | ||
163 | rdev = container_of(wk, struct cfg80211_registered_device, | |
164 | sched_scan_results_wk); | |
165 | ||
166 | request = rdev->sched_scan_req; | |
167 | ||
168 | mutex_lock(&rdev->sched_scan_mtx); | |
169 | ||
170 | /* we don't have sched_scan_req anymore if the scan is stopping */ | |
171 | if (request) { | |
172 | if (request->flags & NL80211_SCAN_FLAG_FLUSH) { | |
173 | /* flush entries from previous scans */ | |
174 | spin_lock_bh(&rdev->bss_lock); | |
175 | __cfg80211_bss_expire(rdev, request->scan_start); | |
176 | spin_unlock_bh(&rdev->bss_lock); | |
177 | request->scan_start = | |
178 | jiffies + msecs_to_jiffies(request->interval); | |
179 | } | |
180 | nl80211_send_sched_scan_results(rdev, request->dev); | |
181 | } | |
182 | ||
183 | mutex_unlock(&rdev->sched_scan_mtx); | |
184 | } | |
185 | ||
186 | void cfg80211_sched_scan_results(struct wiphy *wiphy) | |
187 | { | |
188 | trace_cfg80211_sched_scan_results(wiphy); | |
189 | /* ignore if we're not scanning */ | |
190 | if (wiphy_to_dev(wiphy)->sched_scan_req) | |
191 | queue_work(cfg80211_wq, | |
192 | &wiphy_to_dev(wiphy)->sched_scan_results_wk); | |
193 | } | |
194 | EXPORT_SYMBOL(cfg80211_sched_scan_results); | |
195 | ||
196 | void cfg80211_sched_scan_stopped(struct wiphy *wiphy) | |
197 | { | |
198 | struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); | |
199 | ||
200 | trace_cfg80211_sched_scan_stopped(wiphy); | |
201 | ||
202 | mutex_lock(&rdev->sched_scan_mtx); | |
203 | __cfg80211_stop_sched_scan(rdev, true); | |
204 | mutex_unlock(&rdev->sched_scan_mtx); | |
205 | } | |
206 | EXPORT_SYMBOL(cfg80211_sched_scan_stopped); | |
207 | ||
208 | int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev, | |
209 | bool driver_initiated) | |
210 | { | |
211 | struct net_device *dev; | |
212 | ||
213 | lockdep_assert_held(&rdev->sched_scan_mtx); | |
214 | ||
215 | if (!rdev->sched_scan_req) | |
216 | return -ENOENT; | |
217 | ||
218 | dev = rdev->sched_scan_req->dev; | |
219 | ||
220 | if (!driver_initiated) { | |
221 | int err = rdev_sched_scan_stop(rdev, dev); | |
222 | if (err) | |
223 | return err; | |
224 | } | |
225 | ||
226 | nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED); | |
227 | ||
228 | kfree(rdev->sched_scan_req); | |
229 | rdev->sched_scan_req = NULL; | |
230 | ||
231 | return 0; | |
232 | } | |
233 | ||
234 | void cfg80211_bss_age(struct cfg80211_registered_device *dev, | |
235 | unsigned long age_secs) | |
236 | { | |
237 | struct cfg80211_internal_bss *bss; | |
238 | unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); | |
239 | ||
240 | spin_lock_bh(&dev->bss_lock); | |
241 | list_for_each_entry(bss, &dev->bss_list, list) | |
242 | bss->ts -= age_jiffies; | |
243 | spin_unlock_bh(&dev->bss_lock); | |
244 | } | |
245 | ||
246 | void cfg80211_bss_expire(struct cfg80211_registered_device *dev) | |
247 | { | |
248 | __cfg80211_bss_expire(dev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE); | |
249 | } | |
250 | ||
251 | const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len) | |
252 | { | |
253 | while (len > 2 && ies[0] != eid) { | |
254 | len -= ies[1] + 2; | |
255 | ies += ies[1] + 2; | |
256 | } | |
257 | if (len < 2) | |
258 | return NULL; | |
259 | if (len < 2 + ies[1]) | |
260 | return NULL; | |
261 | return ies; | |
262 | } | |
263 | EXPORT_SYMBOL(cfg80211_find_ie); | |
264 | ||
265 | const u8 *cfg80211_find_vendor_ie(unsigned int oui, u8 oui_type, | |
266 | const u8 *ies, int len) | |
267 | { | |
268 | struct ieee80211_vendor_ie *ie; | |
269 | const u8 *pos = ies, *end = ies + len; | |
270 | int ie_oui; | |
271 | ||
272 | while (pos < end) { | |
273 | pos = cfg80211_find_ie(WLAN_EID_VENDOR_SPECIFIC, pos, | |
274 | end - pos); | |
275 | if (!pos) | |
276 | return NULL; | |
277 | ||
278 | if (end - pos < sizeof(*ie)) | |
279 | return NULL; | |
280 | ||
281 | ie = (struct ieee80211_vendor_ie *)pos; | |
282 | ie_oui = ie->oui[0] << 16 | ie->oui[1] << 8 | ie->oui[2]; | |
283 | if (ie_oui == oui && ie->oui_type == oui_type) | |
284 | return pos; | |
285 | ||
286 | pos += 2 + ie->len; | |
287 | } | |
288 | return NULL; | |
289 | } | |
290 | EXPORT_SYMBOL(cfg80211_find_vendor_ie); | |
291 | ||
292 | static bool is_bss(struct cfg80211_bss *a, const u8 *bssid, | |
293 | const u8 *ssid, size_t ssid_len) | |
294 | { | |
295 | const struct cfg80211_bss_ies *ies; | |
296 | const u8 *ssidie; | |
297 | ||
298 | if (bssid && !ether_addr_equal(a->bssid, bssid)) | |
299 | return false; | |
300 | ||
301 | if (!ssid) | |
302 | return true; | |
303 | ||
304 | ies = rcu_access_pointer(a->ies); | |
305 | if (!ies) | |
306 | return false; | |
307 | ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); | |
308 | if (!ssidie) | |
309 | return false; | |
310 | if (ssidie[1] != ssid_len) | |
311 | return false; | |
312 | return memcmp(ssidie + 2, ssid, ssid_len) == 0; | |
313 | } | |
314 | ||
315 | /** | |
316 | * enum bss_compare_mode - BSS compare mode | |
317 | * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find) | |
318 | * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode | |
319 | * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode | |
320 | */ | |
321 | enum bss_compare_mode { | |
322 | BSS_CMP_REGULAR, | |
323 | BSS_CMP_HIDE_ZLEN, | |
324 | BSS_CMP_HIDE_NUL, | |
325 | }; | |
326 | ||
327 | static int cmp_bss(struct cfg80211_bss *a, | |
328 | struct cfg80211_bss *b, | |
329 | enum bss_compare_mode mode) | |
330 | { | |
331 | const struct cfg80211_bss_ies *a_ies, *b_ies; | |
332 | const u8 *ie1 = NULL; | |
333 | const u8 *ie2 = NULL; | |
334 | int i, r; | |
335 | ||
336 | if (a->channel != b->channel) | |
337 | return b->channel->center_freq - a->channel->center_freq; | |
338 | ||
339 | a_ies = rcu_access_pointer(a->ies); | |
340 | if (!a_ies) | |
341 | return -1; | |
342 | b_ies = rcu_access_pointer(b->ies); | |
343 | if (!b_ies) | |
344 | return 1; | |
345 | ||
346 | if (WLAN_CAPABILITY_IS_STA_BSS(a->capability)) | |
347 | ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID, | |
348 | a_ies->data, a_ies->len); | |
349 | if (WLAN_CAPABILITY_IS_STA_BSS(b->capability)) | |
350 | ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID, | |
351 | b_ies->data, b_ies->len); | |
352 | if (ie1 && ie2) { | |
353 | int mesh_id_cmp; | |
354 | ||
355 | if (ie1[1] == ie2[1]) | |
356 | mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]); | |
357 | else | |
358 | mesh_id_cmp = ie2[1] - ie1[1]; | |
359 | ||
360 | ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, | |
361 | a_ies->data, a_ies->len); | |
362 | ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, | |
363 | b_ies->data, b_ies->len); | |
364 | if (ie1 && ie2) { | |
365 | if (mesh_id_cmp) | |
366 | return mesh_id_cmp; | |
367 | if (ie1[1] != ie2[1]) | |
368 | return ie2[1] - ie1[1]; | |
369 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); | |
370 | } | |
371 | } | |
372 | ||
373 | /* | |
374 | * we can't use compare_ether_addr here since we need a < > operator. | |
375 | * The binary return value of compare_ether_addr isn't enough | |
376 | */ | |
377 | r = memcmp(a->bssid, b->bssid, sizeof(a->bssid)); | |
378 | if (r) | |
379 | return r; | |
380 | ||
381 | ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len); | |
382 | ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len); | |
383 | ||
384 | if (!ie1 && !ie2) | |
385 | return 0; | |
386 | ||
387 | /* | |
388 | * Note that with "hide_ssid", the function returns a match if | |
389 | * the already-present BSS ("b") is a hidden SSID beacon for | |
390 | * the new BSS ("a"). | |
391 | */ | |
392 | ||
393 | /* sort missing IE before (left of) present IE */ | |
394 | if (!ie1) | |
395 | return -1; | |
396 | if (!ie2) | |
397 | return 1; | |
398 | ||
399 | switch (mode) { | |
400 | case BSS_CMP_HIDE_ZLEN: | |
401 | /* | |
402 | * In ZLEN mode we assume the BSS entry we're | |
403 | * looking for has a zero-length SSID. So if | |
404 | * the one we're looking at right now has that, | |
405 | * return 0. Otherwise, return the difference | |
406 | * in length, but since we're looking for the | |
407 | * 0-length it's really equivalent to returning | |
408 | * the length of the one we're looking at. | |
409 | * | |
410 | * No content comparison is needed as we assume | |
411 | * the content length is zero. | |
412 | */ | |
413 | return ie2[1]; | |
414 | case BSS_CMP_REGULAR: | |
415 | default: | |
416 | /* sort by length first, then by contents */ | |
417 | if (ie1[1] != ie2[1]) | |
418 | return ie2[1] - ie1[1]; | |
419 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); | |
420 | case BSS_CMP_HIDE_NUL: | |
421 | if (ie1[1] != ie2[1]) | |
422 | return ie2[1] - ie1[1]; | |
423 | /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */ | |
424 | for (i = 0; i < ie2[1]; i++) | |
425 | if (ie2[i + 2]) | |
426 | return -1; | |
427 | return 0; | |
428 | } | |
429 | } | |
430 | ||
431 | struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, | |
432 | struct ieee80211_channel *channel, | |
433 | const u8 *bssid, | |
434 | const u8 *ssid, size_t ssid_len, | |
435 | u16 capa_mask, u16 capa_val) | |
436 | { | |
437 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
438 | struct cfg80211_internal_bss *bss, *res = NULL; | |
439 | unsigned long now = jiffies; | |
440 | ||
441 | trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, capa_mask, | |
442 | capa_val); | |
443 | ||
444 | spin_lock_bh(&dev->bss_lock); | |
445 | ||
446 | list_for_each_entry(bss, &dev->bss_list, list) { | |
447 | if ((bss->pub.capability & capa_mask) != capa_val) | |
448 | continue; | |
449 | if (channel && bss->pub.channel != channel) | |
450 | continue; | |
451 | /* Don't get expired BSS structs */ | |
452 | if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) && | |
453 | !atomic_read(&bss->hold)) | |
454 | continue; | |
455 | if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { | |
456 | res = bss; | |
457 | kref_get(&res->ref); | |
458 | break; | |
459 | } | |
460 | } | |
461 | ||
462 | spin_unlock_bh(&dev->bss_lock); | |
463 | if (!res) | |
464 | return NULL; | |
465 | trace_cfg80211_return_bss(&res->pub); | |
466 | return &res->pub; | |
467 | } | |
468 | EXPORT_SYMBOL(cfg80211_get_bss); | |
469 | ||
470 | static void rb_insert_bss(struct cfg80211_registered_device *dev, | |
471 | struct cfg80211_internal_bss *bss) | |
472 | { | |
473 | struct rb_node **p = &dev->bss_tree.rb_node; | |
474 | struct rb_node *parent = NULL; | |
475 | struct cfg80211_internal_bss *tbss; | |
476 | int cmp; | |
477 | ||
478 | while (*p) { | |
479 | parent = *p; | |
480 | tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); | |
481 | ||
482 | cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR); | |
483 | ||
484 | if (WARN_ON(!cmp)) { | |
485 | /* will sort of leak this BSS */ | |
486 | return; | |
487 | } | |
488 | ||
489 | if (cmp < 0) | |
490 | p = &(*p)->rb_left; | |
491 | else | |
492 | p = &(*p)->rb_right; | |
493 | } | |
494 | ||
495 | rb_link_node(&bss->rbn, parent, p); | |
496 | rb_insert_color(&bss->rbn, &dev->bss_tree); | |
497 | } | |
498 | ||
499 | static struct cfg80211_internal_bss * | |
500 | rb_find_bss(struct cfg80211_registered_device *dev, | |
501 | struct cfg80211_internal_bss *res, | |
502 | enum bss_compare_mode mode) | |
503 | { | |
504 | struct rb_node *n = dev->bss_tree.rb_node; | |
505 | struct cfg80211_internal_bss *bss; | |
506 | int r; | |
507 | ||
508 | while (n) { | |
509 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); | |
510 | r = cmp_bss(&res->pub, &bss->pub, mode); | |
511 | ||
512 | if (r == 0) | |
513 | return bss; | |
514 | else if (r < 0) | |
515 | n = n->rb_left; | |
516 | else | |
517 | n = n->rb_right; | |
518 | } | |
519 | ||
520 | return NULL; | |
521 | } | |
522 | ||
523 | static void | |
524 | copy_hidden_ies(struct cfg80211_internal_bss *res, | |
525 | struct cfg80211_internal_bss *hidden) | |
526 | { | |
527 | const struct cfg80211_bss_ies *ies; | |
528 | ||
529 | if (rcu_access_pointer(res->pub.beacon_ies)) | |
530 | return; | |
531 | ||
532 | ies = rcu_access_pointer(hidden->pub.beacon_ies); | |
533 | if (WARN_ON(!ies)) | |
534 | return; | |
535 | ||
536 | ies = kmemdup(ies, sizeof(*ies) + ies->len, GFP_ATOMIC); | |
537 | if (unlikely(!ies)) | |
538 | return; | |
539 | rcu_assign_pointer(res->pub.beacon_ies, ies); | |
540 | } | |
541 | ||
542 | static struct cfg80211_internal_bss * | |
543 | cfg80211_bss_update(struct cfg80211_registered_device *dev, | |
544 | struct cfg80211_internal_bss *tmp) | |
545 | { | |
546 | struct cfg80211_internal_bss *found = NULL; | |
547 | ||
548 | if (WARN_ON(!tmp->pub.channel)) | |
549 | return NULL; | |
550 | ||
551 | tmp->ts = jiffies; | |
552 | ||
553 | spin_lock_bh(&dev->bss_lock); | |
554 | ||
555 | if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) { | |
556 | spin_unlock_bh(&dev->bss_lock); | |
557 | return NULL; | |
558 | } | |
559 | ||
560 | found = rb_find_bss(dev, tmp, BSS_CMP_REGULAR); | |
561 | ||
562 | if (found) { | |
563 | found->pub.beacon_interval = tmp->pub.beacon_interval; | |
564 | found->pub.tsf = tmp->pub.tsf; | |
565 | found->pub.signal = tmp->pub.signal; | |
566 | found->pub.capability = tmp->pub.capability; | |
567 | found->ts = tmp->ts; | |
568 | ||
569 | /* Update IEs */ | |
570 | if (rcu_access_pointer(tmp->pub.proberesp_ies)) { | |
571 | const struct cfg80211_bss_ies *old; | |
572 | ||
573 | old = rcu_access_pointer(found->pub.proberesp_ies); | |
574 | ||
575 | rcu_assign_pointer(found->pub.proberesp_ies, | |
576 | tmp->pub.proberesp_ies); | |
577 | /* Override possible earlier Beacon frame IEs */ | |
578 | rcu_assign_pointer(found->pub.ies, | |
579 | tmp->pub.proberesp_ies); | |
580 | if (old) | |
581 | kfree_rcu((struct cfg80211_bss_ies *)old, | |
582 | rcu_head); | |
583 | } else if (rcu_access_pointer(tmp->pub.beacon_ies)) { | |
584 | const struct cfg80211_bss_ies *old, *ies; | |
585 | ||
586 | old = rcu_access_pointer(found->pub.beacon_ies); | |
587 | ies = rcu_access_pointer(found->pub.ies); | |
588 | ||
589 | rcu_assign_pointer(found->pub.beacon_ies, | |
590 | tmp->pub.beacon_ies); | |
591 | ||
592 | /* Override IEs if they were from a beacon before */ | |
593 | if (old == ies) | |
594 | rcu_assign_pointer(found->pub.ies, | |
595 | tmp->pub.beacon_ies); | |
596 | ||
597 | if (old) | |
598 | kfree_rcu((struct cfg80211_bss_ies *)old, | |
599 | rcu_head); | |
600 | } | |
601 | } else { | |
602 | struct cfg80211_internal_bss *new; | |
603 | struct cfg80211_internal_bss *hidden; | |
604 | struct cfg80211_bss_ies *ies; | |
605 | ||
606 | /* First check if the beacon is a probe response from | |
607 | * a hidden bss. If so, copy beacon ies (with nullified | |
608 | * ssid) into the probe response bss entry (with real ssid). | |
609 | * It is required basically for PSM implementation | |
610 | * (probe responses do not contain tim ie) */ | |
611 | ||
612 | /* TODO: The code is not trying to update existing probe | |
613 | * response bss entries when beacon ies are | |
614 | * getting changed. */ | |
615 | hidden = rb_find_bss(dev, tmp, BSS_CMP_HIDE_ZLEN); | |
616 | if (hidden) { | |
617 | copy_hidden_ies(tmp, hidden); | |
618 | } else { | |
619 | hidden = rb_find_bss(dev, tmp, BSS_CMP_HIDE_NUL); | |
620 | if (hidden) | |
621 | copy_hidden_ies(tmp, hidden); | |
622 | } | |
623 | ||
624 | /* | |
625 | * create a copy -- the "res" variable that is passed in | |
626 | * is allocated on the stack since it's not needed in the | |
627 | * more common case of an update | |
628 | */ | |
629 | new = kzalloc(sizeof(*new) + dev->wiphy.bss_priv_size, | |
630 | GFP_ATOMIC); | |
631 | if (!new) { | |
632 | ies = (void *)rcu_dereference(tmp->pub.beacon_ies); | |
633 | if (ies) | |
634 | kfree_rcu(ies, rcu_head); | |
635 | ies = (void *)rcu_dereference(tmp->pub.proberesp_ies); | |
636 | if (ies) | |
637 | kfree_rcu(ies, rcu_head); | |
638 | spin_unlock_bh(&dev->bss_lock); | |
639 | return NULL; | |
640 | } | |
641 | memcpy(new, tmp, sizeof(*new)); | |
642 | kref_init(&new->ref); | |
643 | list_add_tail(&new->list, &dev->bss_list); | |
644 | rb_insert_bss(dev, new); | |
645 | found = new; | |
646 | } | |
647 | ||
648 | dev->bss_generation++; | |
649 | spin_unlock_bh(&dev->bss_lock); | |
650 | ||
651 | kref_get(&found->ref); | |
652 | return found; | |
653 | } | |
654 | ||
655 | static struct ieee80211_channel * | |
656 | cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen, | |
657 | struct ieee80211_channel *channel) | |
658 | { | |
659 | const u8 *tmp; | |
660 | u32 freq; | |
661 | int channel_number = -1; | |
662 | ||
663 | tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen); | |
664 | if (tmp && tmp[1] == 1) { | |
665 | channel_number = tmp[2]; | |
666 | } else { | |
667 | tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen); | |
668 | if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) { | |
669 | struct ieee80211_ht_operation *htop = (void *)(tmp + 2); | |
670 | ||
671 | channel_number = htop->primary_chan; | |
672 | } | |
673 | } | |
674 | ||
675 | if (channel_number < 0) | |
676 | return channel; | |
677 | ||
678 | freq = ieee80211_channel_to_frequency(channel_number, channel->band); | |
679 | channel = ieee80211_get_channel(wiphy, freq); | |
680 | if (!channel) | |
681 | return NULL; | |
682 | if (channel->flags & IEEE80211_CHAN_DISABLED) | |
683 | return NULL; | |
684 | return channel; | |
685 | } | |
686 | ||
687 | struct cfg80211_bss* | |
688 | cfg80211_inform_bss(struct wiphy *wiphy, | |
689 | struct ieee80211_channel *channel, | |
690 | const u8 *bssid, u64 tsf, u16 capability, | |
691 | u16 beacon_interval, const u8 *ie, size_t ielen, | |
692 | s32 signal, gfp_t gfp) | |
693 | { | |
694 | struct cfg80211_bss_ies *ies; | |
695 | struct cfg80211_internal_bss tmp = {}, *res; | |
696 | ||
697 | if (WARN_ON(!wiphy)) | |
698 | return NULL; | |
699 | ||
700 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && | |
701 | (signal < 0 || signal > 100))) | |
702 | return NULL; | |
703 | ||
704 | channel = cfg80211_get_bss_channel(wiphy, ie, ielen, channel); | |
705 | if (!channel) | |
706 | return NULL; | |
707 | ||
708 | memcpy(tmp.pub.bssid, bssid, ETH_ALEN); | |
709 | tmp.pub.channel = channel; | |
710 | tmp.pub.signal = signal; | |
711 | tmp.pub.tsf = tsf; | |
712 | tmp.pub.beacon_interval = beacon_interval; | |
713 | tmp.pub.capability = capability; | |
714 | /* | |
715 | * Since we do not know here whether the IEs are from a Beacon or Probe | |
716 | * Response frame, we need to pick one of the options and only use it | |
717 | * with the driver that does not provide the full Beacon/Probe Response | |
718 | * frame. Use Beacon frame pointer to avoid indicating that this should | |
719 | * override the IEs pointer should we have received an earlier | |
720 | * indication of Probe Response data. | |
721 | */ | |
722 | ies = kmalloc(sizeof(*ies) + ielen, gfp); | |
723 | if (!ies) | |
724 | return NULL; | |
725 | ies->len = ielen; | |
726 | memcpy(ies->data, ie, ielen); | |
727 | ||
728 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); | |
729 | rcu_assign_pointer(tmp.pub.ies, ies); | |
730 | ||
731 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), &tmp); | |
732 | if (!res) | |
733 | return NULL; | |
734 | ||
735 | if (res->pub.capability & WLAN_CAPABILITY_ESS) | |
736 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
737 | ||
738 | trace_cfg80211_return_bss(&res->pub); | |
739 | /* cfg80211_bss_update gives us a referenced result */ | |
740 | return &res->pub; | |
741 | } | |
742 | EXPORT_SYMBOL(cfg80211_inform_bss); | |
743 | ||
744 | struct cfg80211_bss * | |
745 | cfg80211_inform_bss_frame(struct wiphy *wiphy, | |
746 | struct ieee80211_channel *channel, | |
747 | struct ieee80211_mgmt *mgmt, size_t len, | |
748 | s32 signal, gfp_t gfp) | |
749 | { | |
750 | struct cfg80211_internal_bss tmp = {}, *res; | |
751 | struct cfg80211_bss_ies *ies; | |
752 | size_t ielen = len - offsetof(struct ieee80211_mgmt, | |
753 | u.probe_resp.variable); | |
754 | ||
755 | BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) != | |
756 | offsetof(struct ieee80211_mgmt, u.beacon.variable)); | |
757 | ||
758 | trace_cfg80211_inform_bss_frame(wiphy, channel, mgmt, len, signal); | |
759 | ||
760 | if (WARN_ON(!mgmt)) | |
761 | return NULL; | |
762 | ||
763 | if (WARN_ON(!wiphy)) | |
764 | return NULL; | |
765 | ||
766 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && | |
767 | (signal < 0 || signal > 100))) | |
768 | return NULL; | |
769 | ||
770 | if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) | |
771 | return NULL; | |
772 | ||
773 | channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable, | |
774 | ielen, channel); | |
775 | if (!channel) | |
776 | return NULL; | |
777 | ||
778 | ies = kmalloc(sizeof(*ies) + ielen, gfp); | |
779 | if (!ies) | |
780 | return NULL; | |
781 | ies->len = ielen; | |
782 | memcpy(ies->data, mgmt->u.probe_resp.variable, ielen); | |
783 | ||
784 | if (ieee80211_is_probe_resp(mgmt->frame_control)) | |
785 | rcu_assign_pointer(tmp.pub.proberesp_ies, ies); | |
786 | else | |
787 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); | |
788 | rcu_assign_pointer(tmp.pub.ies, ies); | |
789 | ||
790 | memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN); | |
791 | tmp.pub.channel = channel; | |
792 | tmp.pub.signal = signal; | |
793 | tmp.pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); | |
794 | tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); | |
795 | tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); | |
796 | ||
797 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), &tmp); | |
798 | if (!res) | |
799 | return NULL; | |
800 | ||
801 | if (res->pub.capability & WLAN_CAPABILITY_ESS) | |
802 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
803 | ||
804 | trace_cfg80211_return_bss(&res->pub); | |
805 | /* cfg80211_bss_update gives us a referenced result */ | |
806 | return &res->pub; | |
807 | } | |
808 | EXPORT_SYMBOL(cfg80211_inform_bss_frame); | |
809 | ||
810 | void cfg80211_ref_bss(struct cfg80211_bss *pub) | |
811 | { | |
812 | struct cfg80211_internal_bss *bss; | |
813 | ||
814 | if (!pub) | |
815 | return; | |
816 | ||
817 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
818 | kref_get(&bss->ref); | |
819 | } | |
820 | EXPORT_SYMBOL(cfg80211_ref_bss); | |
821 | ||
822 | void cfg80211_put_bss(struct cfg80211_bss *pub) | |
823 | { | |
824 | struct cfg80211_internal_bss *bss; | |
825 | ||
826 | if (!pub) | |
827 | return; | |
828 | ||
829 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
830 | kref_put(&bss->ref, bss_release); | |
831 | } | |
832 | EXPORT_SYMBOL(cfg80211_put_bss); | |
833 | ||
834 | void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) | |
835 | { | |
836 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
837 | struct cfg80211_internal_bss *bss; | |
838 | ||
839 | if (WARN_ON(!pub)) | |
840 | return; | |
841 | ||
842 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
843 | ||
844 | spin_lock_bh(&dev->bss_lock); | |
845 | if (!list_empty(&bss->list)) { | |
846 | __cfg80211_unlink_bss(dev, bss); | |
847 | dev->bss_generation++; | |
848 | } | |
849 | spin_unlock_bh(&dev->bss_lock); | |
850 | } | |
851 | EXPORT_SYMBOL(cfg80211_unlink_bss); | |
852 | ||
853 | #ifdef CONFIG_CFG80211_WEXT | |
854 | int cfg80211_wext_siwscan(struct net_device *dev, | |
855 | struct iw_request_info *info, | |
856 | union iwreq_data *wrqu, char *extra) | |
857 | { | |
858 | struct cfg80211_registered_device *rdev; | |
859 | struct wiphy *wiphy; | |
860 | struct iw_scan_req *wreq = NULL; | |
861 | struct cfg80211_scan_request *creq = NULL; | |
862 | int i, err, n_channels = 0; | |
863 | enum ieee80211_band band; | |
864 | ||
865 | if (!netif_running(dev)) | |
866 | return -ENETDOWN; | |
867 | ||
868 | if (wrqu->data.length == sizeof(struct iw_scan_req)) | |
869 | wreq = (struct iw_scan_req *)extra; | |
870 | ||
871 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); | |
872 | ||
873 | if (IS_ERR(rdev)) | |
874 | return PTR_ERR(rdev); | |
875 | ||
876 | if (rdev->scan_req) { | |
877 | err = -EBUSY; | |
878 | goto out; | |
879 | } | |
880 | ||
881 | wiphy = &rdev->wiphy; | |
882 | ||
883 | /* Determine number of channels, needed to allocate creq */ | |
884 | if (wreq && wreq->num_channels) | |
885 | n_channels = wreq->num_channels; | |
886 | else { | |
887 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) | |
888 | if (wiphy->bands[band]) | |
889 | n_channels += wiphy->bands[band]->n_channels; | |
890 | } | |
891 | ||
892 | creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + | |
893 | n_channels * sizeof(void *), | |
894 | GFP_ATOMIC); | |
895 | if (!creq) { | |
896 | err = -ENOMEM; | |
897 | goto out; | |
898 | } | |
899 | ||
900 | creq->wiphy = wiphy; | |
901 | creq->wdev = dev->ieee80211_ptr; | |
902 | /* SSIDs come after channels */ | |
903 | creq->ssids = (void *)&creq->channels[n_channels]; | |
904 | creq->n_channels = n_channels; | |
905 | creq->n_ssids = 1; | |
906 | creq->scan_start = jiffies; | |
907 | ||
908 | /* translate "Scan on frequencies" request */ | |
909 | i = 0; | |
910 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
911 | int j; | |
912 | ||
913 | if (!wiphy->bands[band]) | |
914 | continue; | |
915 | ||
916 | for (j = 0; j < wiphy->bands[band]->n_channels; j++) { | |
917 | /* ignore disabled channels */ | |
918 | if (wiphy->bands[band]->channels[j].flags & | |
919 | IEEE80211_CHAN_DISABLED) | |
920 | continue; | |
921 | ||
922 | /* If we have a wireless request structure and the | |
923 | * wireless request specifies frequencies, then search | |
924 | * for the matching hardware channel. | |
925 | */ | |
926 | if (wreq && wreq->num_channels) { | |
927 | int k; | |
928 | int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; | |
929 | for (k = 0; k < wreq->num_channels; k++) { | |
930 | int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]); | |
931 | if (wext_freq == wiphy_freq) | |
932 | goto wext_freq_found; | |
933 | } | |
934 | goto wext_freq_not_found; | |
935 | } | |
936 | ||
937 | wext_freq_found: | |
938 | creq->channels[i] = &wiphy->bands[band]->channels[j]; | |
939 | i++; | |
940 | wext_freq_not_found: ; | |
941 | } | |
942 | } | |
943 | /* No channels found? */ | |
944 | if (!i) { | |
945 | err = -EINVAL; | |
946 | goto out; | |
947 | } | |
948 | ||
949 | /* Set real number of channels specified in creq->channels[] */ | |
950 | creq->n_channels = i; | |
951 | ||
952 | /* translate "Scan for SSID" request */ | |
953 | if (wreq) { | |
954 | if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { | |
955 | if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { | |
956 | err = -EINVAL; | |
957 | goto out; | |
958 | } | |
959 | memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); | |
960 | creq->ssids[0].ssid_len = wreq->essid_len; | |
961 | } | |
962 | if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) | |
963 | creq->n_ssids = 0; | |
964 | } | |
965 | ||
966 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) | |
967 | if (wiphy->bands[i]) | |
968 | creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1; | |
969 | ||
970 | rdev->scan_req = creq; | |
971 | err = rdev_scan(rdev, creq); | |
972 | if (err) { | |
973 | rdev->scan_req = NULL; | |
974 | /* creq will be freed below */ | |
975 | } else { | |
976 | nl80211_send_scan_start(rdev, dev->ieee80211_ptr); | |
977 | /* creq now owned by driver */ | |
978 | creq = NULL; | |
979 | dev_hold(dev); | |
980 | } | |
981 | out: | |
982 | kfree(creq); | |
983 | cfg80211_unlock_rdev(rdev); | |
984 | return err; | |
985 | } | |
986 | EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan); | |
987 | ||
988 | static void ieee80211_scan_add_ies(struct iw_request_info *info, | |
989 | const struct cfg80211_bss_ies *ies, | |
990 | char **current_ev, char *end_buf) | |
991 | { | |
992 | const u8 *pos, *end, *next; | |
993 | struct iw_event iwe; | |
994 | ||
995 | if (!ies) | |
996 | return; | |
997 | ||
998 | /* | |
999 | * If needed, fragment the IEs buffer (at IE boundaries) into short | |
1000 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. | |
1001 | */ | |
1002 | pos = ies->data; | |
1003 | end = pos + ies->len; | |
1004 | ||
1005 | while (end - pos > IW_GENERIC_IE_MAX) { | |
1006 | next = pos + 2 + pos[1]; | |
1007 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) | |
1008 | next = next + 2 + next[1]; | |
1009 | ||
1010 | memset(&iwe, 0, sizeof(iwe)); | |
1011 | iwe.cmd = IWEVGENIE; | |
1012 | iwe.u.data.length = next - pos; | |
1013 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
1014 | end_buf, &iwe, | |
1015 | (void *)pos); | |
1016 | ||
1017 | pos = next; | |
1018 | } | |
1019 | ||
1020 | if (end > pos) { | |
1021 | memset(&iwe, 0, sizeof(iwe)); | |
1022 | iwe.cmd = IWEVGENIE; | |
1023 | iwe.u.data.length = end - pos; | |
1024 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
1025 | end_buf, &iwe, | |
1026 | (void *)pos); | |
1027 | } | |
1028 | } | |
1029 | ||
1030 | static inline unsigned int elapsed_jiffies_msecs(unsigned long start) | |
1031 | { | |
1032 | unsigned long end = jiffies; | |
1033 | ||
1034 | if (end >= start) | |
1035 | return jiffies_to_msecs(end - start); | |
1036 | ||
1037 | return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1); | |
1038 | } | |
1039 | ||
1040 | static char * | |
1041 | ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, | |
1042 | struct cfg80211_internal_bss *bss, char *current_ev, | |
1043 | char *end_buf) | |
1044 | { | |
1045 | const struct cfg80211_bss_ies *ies; | |
1046 | struct iw_event iwe; | |
1047 | const u8 *ie; | |
1048 | u8 *buf, *cfg, *p; | |
1049 | int rem, i, sig; | |
1050 | bool ismesh = false; | |
1051 | ||
1052 | memset(&iwe, 0, sizeof(iwe)); | |
1053 | iwe.cmd = SIOCGIWAP; | |
1054 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; | |
1055 | memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); | |
1056 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
1057 | IW_EV_ADDR_LEN); | |
1058 | ||
1059 | memset(&iwe, 0, sizeof(iwe)); | |
1060 | iwe.cmd = SIOCGIWFREQ; | |
1061 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); | |
1062 | iwe.u.freq.e = 0; | |
1063 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
1064 | IW_EV_FREQ_LEN); | |
1065 | ||
1066 | memset(&iwe, 0, sizeof(iwe)); | |
1067 | iwe.cmd = SIOCGIWFREQ; | |
1068 | iwe.u.freq.m = bss->pub.channel->center_freq; | |
1069 | iwe.u.freq.e = 6; | |
1070 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
1071 | IW_EV_FREQ_LEN); | |
1072 | ||
1073 | if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { | |
1074 | memset(&iwe, 0, sizeof(iwe)); | |
1075 | iwe.cmd = IWEVQUAL; | |
1076 | iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | | |
1077 | IW_QUAL_NOISE_INVALID | | |
1078 | IW_QUAL_QUAL_UPDATED; | |
1079 | switch (wiphy->signal_type) { | |
1080 | case CFG80211_SIGNAL_TYPE_MBM: | |
1081 | sig = bss->pub.signal / 100; | |
1082 | iwe.u.qual.level = sig; | |
1083 | iwe.u.qual.updated |= IW_QUAL_DBM; | |
1084 | if (sig < -110) /* rather bad */ | |
1085 | sig = -110; | |
1086 | else if (sig > -40) /* perfect */ | |
1087 | sig = -40; | |
1088 | /* will give a range of 0 .. 70 */ | |
1089 | iwe.u.qual.qual = sig + 110; | |
1090 | break; | |
1091 | case CFG80211_SIGNAL_TYPE_UNSPEC: | |
1092 | iwe.u.qual.level = bss->pub.signal; | |
1093 | /* will give range 0 .. 100 */ | |
1094 | iwe.u.qual.qual = bss->pub.signal; | |
1095 | break; | |
1096 | default: | |
1097 | /* not reached */ | |
1098 | break; | |
1099 | } | |
1100 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
1101 | &iwe, IW_EV_QUAL_LEN); | |
1102 | } | |
1103 | ||
1104 | memset(&iwe, 0, sizeof(iwe)); | |
1105 | iwe.cmd = SIOCGIWENCODE; | |
1106 | if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) | |
1107 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; | |
1108 | else | |
1109 | iwe.u.data.flags = IW_ENCODE_DISABLED; | |
1110 | iwe.u.data.length = 0; | |
1111 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
1112 | &iwe, ""); | |
1113 | ||
1114 | rcu_read_lock(); | |
1115 | ies = rcu_dereference(bss->pub.ies); | |
1116 | if (ies) { | |
1117 | rem = ies->len; | |
1118 | ie = ies->data; | |
1119 | } else { | |
1120 | rem = 0; | |
1121 | ie = NULL; | |
1122 | } | |
1123 | ||
1124 | while (ies && rem >= 2) { | |
1125 | /* invalid data */ | |
1126 | if (ie[1] > rem - 2) | |
1127 | break; | |
1128 | ||
1129 | switch (ie[0]) { | |
1130 | case WLAN_EID_SSID: | |
1131 | memset(&iwe, 0, sizeof(iwe)); | |
1132 | iwe.cmd = SIOCGIWESSID; | |
1133 | iwe.u.data.length = ie[1]; | |
1134 | iwe.u.data.flags = 1; | |
1135 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
1136 | &iwe, (u8 *)ie + 2); | |
1137 | break; | |
1138 | case WLAN_EID_MESH_ID: | |
1139 | memset(&iwe, 0, sizeof(iwe)); | |
1140 | iwe.cmd = SIOCGIWESSID; | |
1141 | iwe.u.data.length = ie[1]; | |
1142 | iwe.u.data.flags = 1; | |
1143 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
1144 | &iwe, (u8 *)ie + 2); | |
1145 | break; | |
1146 | case WLAN_EID_MESH_CONFIG: | |
1147 | ismesh = true; | |
1148 | if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) | |
1149 | break; | |
1150 | buf = kmalloc(50, GFP_ATOMIC); | |
1151 | if (!buf) | |
1152 | break; | |
1153 | cfg = (u8 *)ie + 2; | |
1154 | memset(&iwe, 0, sizeof(iwe)); | |
1155 | iwe.cmd = IWEVCUSTOM; | |
1156 | sprintf(buf, "Mesh Network Path Selection Protocol ID: " | |
1157 | "0x%02X", cfg[0]); | |
1158 | iwe.u.data.length = strlen(buf); | |
1159 | current_ev = iwe_stream_add_point(info, current_ev, | |
1160 | end_buf, | |
1161 | &iwe, buf); | |
1162 | sprintf(buf, "Path Selection Metric ID: 0x%02X", | |
1163 | cfg[1]); | |
1164 | iwe.u.data.length = strlen(buf); | |
1165 | current_ev = iwe_stream_add_point(info, current_ev, | |
1166 | end_buf, | |
1167 | &iwe, buf); | |
1168 | sprintf(buf, "Congestion Control Mode ID: 0x%02X", | |
1169 | cfg[2]); | |
1170 | iwe.u.data.length = strlen(buf); | |
1171 | current_ev = iwe_stream_add_point(info, current_ev, | |
1172 | end_buf, | |
1173 | &iwe, buf); | |
1174 | sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]); | |
1175 | iwe.u.data.length = strlen(buf); | |
1176 | current_ev = iwe_stream_add_point(info, current_ev, | |
1177 | end_buf, | |
1178 | &iwe, buf); | |
1179 | sprintf(buf, "Authentication ID: 0x%02X", cfg[4]); | |
1180 | iwe.u.data.length = strlen(buf); | |
1181 | current_ev = iwe_stream_add_point(info, current_ev, | |
1182 | end_buf, | |
1183 | &iwe, buf); | |
1184 | sprintf(buf, "Formation Info: 0x%02X", cfg[5]); | |
1185 | iwe.u.data.length = strlen(buf); | |
1186 | current_ev = iwe_stream_add_point(info, current_ev, | |
1187 | end_buf, | |
1188 | &iwe, buf); | |
1189 | sprintf(buf, "Capabilities: 0x%02X", cfg[6]); | |
1190 | iwe.u.data.length = strlen(buf); | |
1191 | current_ev = iwe_stream_add_point(info, current_ev, | |
1192 | end_buf, | |
1193 | &iwe, buf); | |
1194 | kfree(buf); | |
1195 | break; | |
1196 | case WLAN_EID_SUPP_RATES: | |
1197 | case WLAN_EID_EXT_SUPP_RATES: | |
1198 | /* display all supported rates in readable format */ | |
1199 | p = current_ev + iwe_stream_lcp_len(info); | |
1200 | ||
1201 | memset(&iwe, 0, sizeof(iwe)); | |
1202 | iwe.cmd = SIOCGIWRATE; | |
1203 | /* Those two flags are ignored... */ | |
1204 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; | |
1205 | ||
1206 | for (i = 0; i < ie[1]; i++) { | |
1207 | iwe.u.bitrate.value = | |
1208 | ((ie[i + 2] & 0x7f) * 500000); | |
1209 | p = iwe_stream_add_value(info, current_ev, p, | |
1210 | end_buf, &iwe, IW_EV_PARAM_LEN); | |
1211 | } | |
1212 | current_ev = p; | |
1213 | break; | |
1214 | } | |
1215 | rem -= ie[1] + 2; | |
1216 | ie += ie[1] + 2; | |
1217 | } | |
1218 | ||
1219 | if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || | |
1220 | ismesh) { | |
1221 | memset(&iwe, 0, sizeof(iwe)); | |
1222 | iwe.cmd = SIOCGIWMODE; | |
1223 | if (ismesh) | |
1224 | iwe.u.mode = IW_MODE_MESH; | |
1225 | else if (bss->pub.capability & WLAN_CAPABILITY_ESS) | |
1226 | iwe.u.mode = IW_MODE_MASTER; | |
1227 | else | |
1228 | iwe.u.mode = IW_MODE_ADHOC; | |
1229 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
1230 | &iwe, IW_EV_UINT_LEN); | |
1231 | } | |
1232 | ||
1233 | buf = kmalloc(30, GFP_ATOMIC); | |
1234 | if (buf) { | |
1235 | memset(&iwe, 0, sizeof(iwe)); | |
1236 | iwe.cmd = IWEVCUSTOM; | |
1237 | sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf)); | |
1238 | iwe.u.data.length = strlen(buf); | |
1239 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
1240 | &iwe, buf); | |
1241 | memset(&iwe, 0, sizeof(iwe)); | |
1242 | iwe.cmd = IWEVCUSTOM; | |
1243 | sprintf(buf, " Last beacon: %ums ago", | |
1244 | elapsed_jiffies_msecs(bss->ts)); | |
1245 | iwe.u.data.length = strlen(buf); | |
1246 | current_ev = iwe_stream_add_point(info, current_ev, | |
1247 | end_buf, &iwe, buf); | |
1248 | kfree(buf); | |
1249 | } | |
1250 | ||
1251 | ieee80211_scan_add_ies(info, ies, ¤t_ev, end_buf); | |
1252 | rcu_read_unlock(); | |
1253 | ||
1254 | return current_ev; | |
1255 | } | |
1256 | ||
1257 | ||
1258 | static int ieee80211_scan_results(struct cfg80211_registered_device *dev, | |
1259 | struct iw_request_info *info, | |
1260 | char *buf, size_t len) | |
1261 | { | |
1262 | char *current_ev = buf; | |
1263 | char *end_buf = buf + len; | |
1264 | struct cfg80211_internal_bss *bss; | |
1265 | ||
1266 | spin_lock_bh(&dev->bss_lock); | |
1267 | cfg80211_bss_expire(dev); | |
1268 | ||
1269 | list_for_each_entry(bss, &dev->bss_list, list) { | |
1270 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { | |
1271 | spin_unlock_bh(&dev->bss_lock); | |
1272 | return -E2BIG; | |
1273 | } | |
1274 | current_ev = ieee80211_bss(&dev->wiphy, info, bss, | |
1275 | current_ev, end_buf); | |
1276 | } | |
1277 | spin_unlock_bh(&dev->bss_lock); | |
1278 | return current_ev - buf; | |
1279 | } | |
1280 | ||
1281 | ||
1282 | int cfg80211_wext_giwscan(struct net_device *dev, | |
1283 | struct iw_request_info *info, | |
1284 | struct iw_point *data, char *extra) | |
1285 | { | |
1286 | struct cfg80211_registered_device *rdev; | |
1287 | int res; | |
1288 | ||
1289 | if (!netif_running(dev)) | |
1290 | return -ENETDOWN; | |
1291 | ||
1292 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); | |
1293 | ||
1294 | if (IS_ERR(rdev)) | |
1295 | return PTR_ERR(rdev); | |
1296 | ||
1297 | if (rdev->scan_req) { | |
1298 | res = -EAGAIN; | |
1299 | goto out; | |
1300 | } | |
1301 | ||
1302 | res = ieee80211_scan_results(rdev, info, extra, data->length); | |
1303 | data->length = 0; | |
1304 | if (res >= 0) { | |
1305 | data->length = res; | |
1306 | res = 0; | |
1307 | } | |
1308 | ||
1309 | out: | |
1310 | cfg80211_unlock_rdev(rdev); | |
1311 | return res; | |
1312 | } | |
1313 | EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan); | |
1314 | #endif |