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> | |
5a0e3ad6 | 7 | #include <linux/slab.h> |
2a519311 JB |
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> | |
262eb9b2 | 15 | #include <net/cfg80211-wext.h> |
2a519311 JB |
16 | #include <net/iw_handler.h> |
17 | #include "core.h" | |
18 | #include "nl80211.h" | |
a9a11622 | 19 | #include "wext-compat.h" |
e35e4d28 | 20 | #include "rdev-ops.h" |
2a519311 | 21 | |
f9616e0f | 22 | #define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ) |
2a519311 | 23 | |
e8e27c66 AK |
24 | static void bss_release(struct kref *ref) |
25 | { | |
9caf0364 | 26 | struct cfg80211_bss_ies *ies; |
e8e27c66 AK |
27 | struct cfg80211_internal_bss *bss; |
28 | ||
29 | bss = container_of(ref, struct cfg80211_internal_bss, ref); | |
b629ea3d JB |
30 | |
31 | if (WARN_ON(atomic_read(&bss->hold))) | |
32 | return; | |
33 | ||
9caf0364 JB |
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); | |
e8e27c66 | 40 | |
e8e27c66 AK |
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 | ||
15d6030b SL |
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 | ||
01a0ac41 | 74 | void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak) |
2a519311 | 75 | { |
667503dd | 76 | struct cfg80211_scan_request *request; |
fd014284 | 77 | struct wireless_dev *wdev; |
3d23e349 | 78 | #ifdef CONFIG_CFG80211_WEXT |
2a519311 JB |
79 | union iwreq_data wrqu; |
80 | #endif | |
81 | ||
01a0ac41 JB |
82 | ASSERT_RDEV_LOCK(rdev); |
83 | ||
667503dd JB |
84 | request = rdev->scan_req; |
85 | ||
01a0ac41 JB |
86 | if (!request) |
87 | return; | |
88 | ||
fd014284 | 89 | wdev = request->wdev; |
2a519311 | 90 | |
6829c878 JB |
91 | /* |
92 | * This must be before sending the other events! | |
93 | * Otherwise, wpa_supplicant gets completely confused with | |
94 | * wext events. | |
95 | */ | |
fd014284 JB |
96 | if (wdev->netdev) |
97 | cfg80211_sme_scan_done(wdev->netdev); | |
6829c878 | 98 | |
15d6030b | 99 | if (request->aborted) { |
fd014284 | 100 | nl80211_send_scan_aborted(rdev, wdev); |
15d6030b SL |
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 | } | |
fd014284 | 108 | nl80211_send_scan_done(rdev, wdev); |
15d6030b | 109 | } |
2a519311 | 110 | |
3d23e349 | 111 | #ifdef CONFIG_CFG80211_WEXT |
fd014284 | 112 | if (wdev->netdev && !request->aborted) { |
2a519311 JB |
113 | memset(&wrqu, 0, sizeof(wrqu)); |
114 | ||
fd014284 | 115 | wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL); |
2a519311 JB |
116 | } |
117 | #endif | |
118 | ||
fd014284 JB |
119 | if (wdev->netdev) |
120 | dev_put(wdev->netdev); | |
2a519311 | 121 | |
36e6fea8 | 122 | rdev->scan_req = NULL; |
01a0ac41 JB |
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); | |
2a519311 | 134 | } |
667503dd | 135 | |
36e6fea8 JB |
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); | |
01a0ac41 | 144 | ___cfg80211_scan_done(rdev, false); |
36e6fea8 JB |
145 | cfg80211_unlock_rdev(rdev); |
146 | } | |
147 | ||
667503dd JB |
148 | void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted) |
149 | { | |
4ee3e063 | 150 | trace_cfg80211_scan_done(request, aborted); |
667503dd JB |
151 | WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req); |
152 | ||
153 | request->aborted = aborted; | |
e60d7443 | 154 | queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk); |
667503dd | 155 | } |
2a519311 JB |
156 | EXPORT_SYMBOL(cfg80211_scan_done); |
157 | ||
807f8a8c LC |
158 | void __cfg80211_sched_scan_results(struct work_struct *wk) |
159 | { | |
160 | struct cfg80211_registered_device *rdev; | |
15d6030b | 161 | struct cfg80211_sched_scan_request *request; |
807f8a8c LC |
162 | |
163 | rdev = container_of(wk, struct cfg80211_registered_device, | |
164 | sched_scan_results_wk); | |
165 | ||
15d6030b SL |
166 | request = rdev->sched_scan_req; |
167 | ||
c10841ca | 168 | mutex_lock(&rdev->sched_scan_mtx); |
807f8a8c LC |
169 | |
170 | /* we don't have sched_scan_req anymore if the scan is stopping */ | |
15d6030b SL |
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 | } | |
807f8a8c | 182 | |
c10841ca | 183 | mutex_unlock(&rdev->sched_scan_mtx); |
807f8a8c LC |
184 | } |
185 | ||
186 | void cfg80211_sched_scan_results(struct wiphy *wiphy) | |
187 | { | |
4ee3e063 | 188 | trace_cfg80211_sched_scan_results(wiphy); |
807f8a8c LC |
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 | ||
85a9994a | 196 | void cfg80211_sched_scan_stopped(struct wiphy *wiphy) |
807f8a8c | 197 | { |
85a9994a | 198 | struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); |
807f8a8c | 199 | |
4ee3e063 BL |
200 | trace_cfg80211_sched_scan_stopped(wiphy); |
201 | ||
c10841ca | 202 | mutex_lock(&rdev->sched_scan_mtx); |
807f8a8c | 203 | __cfg80211_stop_sched_scan(rdev, true); |
c10841ca | 204 | mutex_unlock(&rdev->sched_scan_mtx); |
807f8a8c | 205 | } |
807f8a8c LC |
206 | EXPORT_SYMBOL(cfg80211_sched_scan_stopped); |
207 | ||
208 | int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev, | |
209 | bool driver_initiated) | |
210 | { | |
807f8a8c LC |
211 | struct net_device *dev; |
212 | ||
c10841ca | 213 | lockdep_assert_held(&rdev->sched_scan_mtx); |
807f8a8c LC |
214 | |
215 | if (!rdev->sched_scan_req) | |
1a84ff75 | 216 | return -ENOENT; |
807f8a8c LC |
217 | |
218 | dev = rdev->sched_scan_req->dev; | |
219 | ||
85a9994a | 220 | if (!driver_initiated) { |
e35e4d28 | 221 | int err = rdev_sched_scan_stop(rdev, dev); |
85a9994a LC |
222 | if (err) |
223 | return err; | |
224 | } | |
807f8a8c LC |
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 | ||
3b4670ff | 231 | return 0; |
807f8a8c LC |
232 | } |
233 | ||
cb3a8eec DW |
234 | /* must hold dev->bss_lock! */ |
235 | void cfg80211_bss_age(struct cfg80211_registered_device *dev, | |
236 | unsigned long age_secs) | |
237 | { | |
238 | struct cfg80211_internal_bss *bss; | |
239 | unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); | |
240 | ||
915de2ff | 241 | list_for_each_entry(bss, &dev->bss_list, list) |
cb3a8eec | 242 | bss->ts -= age_jiffies; |
cb3a8eec DW |
243 | } |
244 | ||
2a519311 JB |
245 | void cfg80211_bss_expire(struct cfg80211_registered_device *dev) |
246 | { | |
15d6030b | 247 | __cfg80211_bss_expire(dev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE); |
2a519311 JB |
248 | } |
249 | ||
c21dbf92 | 250 | const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len) |
2a519311 | 251 | { |
c21dbf92 | 252 | while (len > 2 && ies[0] != eid) { |
2a519311 JB |
253 | len -= ies[1] + 2; |
254 | ies += ies[1] + 2; | |
255 | } | |
256 | if (len < 2) | |
257 | return NULL; | |
258 | if (len < 2 + ies[1]) | |
259 | return NULL; | |
260 | return ies; | |
261 | } | |
c21dbf92 | 262 | EXPORT_SYMBOL(cfg80211_find_ie); |
2a519311 | 263 | |
0c28ec58 EP |
264 | const u8 *cfg80211_find_vendor_ie(unsigned int oui, u8 oui_type, |
265 | const u8 *ies, int len) | |
266 | { | |
267 | struct ieee80211_vendor_ie *ie; | |
268 | const u8 *pos = ies, *end = ies + len; | |
269 | int ie_oui; | |
270 | ||
271 | while (pos < end) { | |
272 | pos = cfg80211_find_ie(WLAN_EID_VENDOR_SPECIFIC, pos, | |
273 | end - pos); | |
274 | if (!pos) | |
275 | return NULL; | |
276 | ||
277 | if (end - pos < sizeof(*ie)) | |
278 | return NULL; | |
279 | ||
280 | ie = (struct ieee80211_vendor_ie *)pos; | |
281 | ie_oui = ie->oui[0] << 16 | ie->oui[1] << 8 | ie->oui[2]; | |
282 | if (ie_oui == oui && ie->oui_type == oui_type) | |
283 | return pos; | |
284 | ||
285 | pos += 2 + ie->len; | |
286 | } | |
287 | return NULL; | |
288 | } | |
289 | EXPORT_SYMBOL(cfg80211_find_vendor_ie); | |
290 | ||
9caf0364 | 291 | static int cmp_ies(u8 num, const u8 *ies1, int len1, const u8 *ies2, int len2) |
2a519311 | 292 | { |
c21dbf92 JB |
293 | const u8 *ie1 = cfg80211_find_ie(num, ies1, len1); |
294 | const u8 *ie2 = cfg80211_find_ie(num, ies2, len2); | |
2a519311 | 295 | |
3b6ef633 | 296 | /* equal if both missing */ |
2a519311 JB |
297 | if (!ie1 && !ie2) |
298 | return 0; | |
3b6ef633 JB |
299 | /* sort missing IE before (left of) present IE */ |
300 | if (!ie1) | |
2a519311 | 301 | return -1; |
3b6ef633 JB |
302 | if (!ie2) |
303 | return 1; | |
2a519311 | 304 | |
3b6ef633 JB |
305 | /* sort by length first, then by contents */ |
306 | if (ie1[1] != ie2[1]) | |
2a519311 | 307 | return ie2[1] - ie1[1]; |
3b6ef633 | 308 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); |
2a519311 JB |
309 | } |
310 | ||
915de2ff | 311 | static bool is_bss(struct cfg80211_bss *a, const u8 *bssid, |
2a519311 JB |
312 | const u8 *ssid, size_t ssid_len) |
313 | { | |
9caf0364 | 314 | const struct cfg80211_bss_ies *ies; |
2a519311 JB |
315 | const u8 *ssidie; |
316 | ||
ac422d3c | 317 | if (bssid && !ether_addr_equal(a->bssid, bssid)) |
2a519311 JB |
318 | return false; |
319 | ||
79420f09 JB |
320 | if (!ssid) |
321 | return true; | |
322 | ||
9caf0364 JB |
323 | ies = rcu_access_pointer(a->ies); |
324 | if (!ies) | |
325 | return false; | |
326 | ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); | |
2a519311 JB |
327 | if (!ssidie) |
328 | return false; | |
329 | if (ssidie[1] != ssid_len) | |
330 | return false; | |
331 | return memcmp(ssidie + 2, ssid, ssid_len) == 0; | |
332 | } | |
333 | ||
333ba732 EP |
334 | static bool is_mesh_bss(struct cfg80211_bss *a) |
335 | { | |
9caf0364 | 336 | const struct cfg80211_bss_ies *ies; |
333ba732 EP |
337 | const u8 *ie; |
338 | ||
339 | if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability)) | |
340 | return false; | |
341 | ||
9caf0364 JB |
342 | ies = rcu_access_pointer(a->ies); |
343 | if (!ies) | |
344 | return false; | |
345 | ||
346 | ie = cfg80211_find_ie(WLAN_EID_MESH_ID, ies->data, ies->len); | |
333ba732 EP |
347 | if (!ie) |
348 | return false; | |
349 | ||
9caf0364 | 350 | ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, ies->data, ies->len); |
333ba732 EP |
351 | if (!ie) |
352 | return false; | |
353 | ||
354 | return true; | |
355 | } | |
356 | ||
2a519311 JB |
357 | static bool is_mesh(struct cfg80211_bss *a, |
358 | const u8 *meshid, size_t meshidlen, | |
359 | const u8 *meshcfg) | |
360 | { | |
9caf0364 | 361 | const struct cfg80211_bss_ies *ies; |
2a519311 JB |
362 | const u8 *ie; |
363 | ||
333ba732 | 364 | if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability)) |
2a519311 JB |
365 | return false; |
366 | ||
9caf0364 JB |
367 | ies = rcu_access_pointer(a->ies); |
368 | if (!ies) | |
369 | return false; | |
370 | ||
371 | ie = cfg80211_find_ie(WLAN_EID_MESH_ID, ies->data, ies->len); | |
2a519311 JB |
372 | if (!ie) |
373 | return false; | |
374 | if (ie[1] != meshidlen) | |
375 | return false; | |
376 | if (memcmp(ie + 2, meshid, meshidlen)) | |
377 | return false; | |
378 | ||
9caf0364 | 379 | ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, ies->data, ies->len); |
cd3468ba JB |
380 | if (!ie) |
381 | return false; | |
136cfa28 | 382 | if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) |
2a519311 JB |
383 | return false; |
384 | ||
385 | /* | |
386 | * Ignore mesh capability (last two bytes of the IE) when | |
387 | * comparing since that may differ between stations taking | |
388 | * part in the same mesh. | |
389 | */ | |
136cfa28 | 390 | return memcmp(ie + 2, meshcfg, |
915de2ff | 391 | sizeof(struct ieee80211_meshconf_ie) - 2) == 0; |
2a519311 JB |
392 | } |
393 | ||
915de2ff | 394 | static int cmp_bss_core(struct cfg80211_bss *a, struct cfg80211_bss *b) |
2a519311 | 395 | { |
9caf0364 | 396 | const struct cfg80211_bss_ies *a_ies, *b_ies; |
2a519311 JB |
397 | int r; |
398 | ||
399 | if (a->channel != b->channel) | |
400 | return b->channel->center_freq - a->channel->center_freq; | |
401 | ||
333ba732 | 402 | if (is_mesh_bss(a) && is_mesh_bss(b)) { |
9caf0364 JB |
403 | a_ies = rcu_access_pointer(a->ies); |
404 | if (!a_ies) | |
405 | return -1; | |
406 | b_ies = rcu_access_pointer(b->ies); | |
407 | if (!b_ies) | |
408 | return 1; | |
409 | ||
2a519311 | 410 | r = cmp_ies(WLAN_EID_MESH_ID, |
9caf0364 JB |
411 | a_ies->data, a_ies->len, |
412 | b_ies->data, b_ies->len); | |
2a519311 JB |
413 | if (r) |
414 | return r; | |
415 | return cmp_ies(WLAN_EID_MESH_CONFIG, | |
9caf0364 JB |
416 | a_ies->data, a_ies->len, |
417 | b_ies->data, b_ies->len); | |
2a519311 JB |
418 | } |
419 | ||
ef9456a8 EG |
420 | /* |
421 | * we can't use compare_ether_addr here since we need a < > operator. | |
422 | * The binary return value of compare_ether_addr isn't enough | |
423 | */ | |
424 | return memcmp(a->bssid, b->bssid, sizeof(a->bssid)); | |
dd9dfb9f DT |
425 | } |
426 | ||
4593c4cb JB |
427 | /** |
428 | * enum bss_compare_mode - BSS compare mode | |
429 | * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find) | |
430 | * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode | |
431 | * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode | |
432 | */ | |
433 | enum bss_compare_mode { | |
434 | BSS_CMP_REGULAR, | |
435 | BSS_CMP_HIDE_ZLEN, | |
436 | BSS_CMP_HIDE_NUL, | |
437 | }; | |
438 | ||
dd9dfb9f | 439 | static int cmp_bss(struct cfg80211_bss *a, |
5622f5bb | 440 | struct cfg80211_bss *b, |
4593c4cb | 441 | enum bss_compare_mode mode) |
dd9dfb9f | 442 | { |
9caf0364 | 443 | const struct cfg80211_bss_ies *a_ies, *b_ies; |
dd9dfb9f DT |
444 | const u8 *ie1; |
445 | const u8 *ie2; | |
5622f5bb | 446 | int i, r; |
dd9dfb9f DT |
447 | |
448 | r = cmp_bss_core(a, b); | |
449 | if (r) | |
450 | return r; | |
451 | ||
9caf0364 JB |
452 | a_ies = rcu_access_pointer(a->ies); |
453 | if (!a_ies) | |
454 | return -1; | |
455 | b_ies = rcu_access_pointer(b->ies); | |
456 | if (!b_ies) | |
457 | return 1; | |
458 | ||
459 | ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len); | |
460 | ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len); | |
dd9dfb9f | 461 | |
5622f5bb JB |
462 | if (!ie1 && !ie2) |
463 | return 0; | |
464 | ||
f94f8b16 | 465 | /* |
5622f5bb JB |
466 | * Note that with "hide_ssid", the function returns a match if |
467 | * the already-present BSS ("b") is a hidden SSID beacon for | |
468 | * the new BSS ("a"). | |
f94f8b16 | 469 | */ |
dd9dfb9f DT |
470 | |
471 | /* sort missing IE before (left of) present IE */ | |
472 | if (!ie1) | |
473 | return -1; | |
474 | if (!ie2) | |
475 | return 1; | |
476 | ||
4593c4cb JB |
477 | switch (mode) { |
478 | case BSS_CMP_HIDE_ZLEN: | |
479 | /* | |
480 | * In ZLEN mode we assume the BSS entry we're | |
481 | * looking for has a zero-length SSID. So if | |
482 | * the one we're looking at right now has that, | |
483 | * return 0. Otherwise, return the difference | |
484 | * in length, but since we're looking for the | |
485 | * 0-length it's really equivalent to returning | |
486 | * the length of the one we're looking at. | |
487 | * | |
488 | * No content comparison is needed as we assume | |
489 | * the content length is zero. | |
490 | */ | |
491 | return ie2[1]; | |
492 | case BSS_CMP_REGULAR: | |
493 | default: | |
494 | /* sort by length first, then by contents */ | |
495 | if (ie1[1] != ie2[1]) | |
496 | return ie2[1] - ie1[1]; | |
5622f5bb | 497 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); |
4593c4cb JB |
498 | case BSS_CMP_HIDE_NUL: |
499 | if (ie1[1] != ie2[1]) | |
500 | return ie2[1] - ie1[1]; | |
501 | /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */ | |
502 | for (i = 0; i < ie2[1]; i++) | |
503 | if (ie2[i + 2]) | |
504 | return -1; | |
505 | return 0; | |
506 | } | |
dd9dfb9f DT |
507 | } |
508 | ||
2a519311 JB |
509 | struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, |
510 | struct ieee80211_channel *channel, | |
511 | const u8 *bssid, | |
79420f09 JB |
512 | const u8 *ssid, size_t ssid_len, |
513 | u16 capa_mask, u16 capa_val) | |
2a519311 JB |
514 | { |
515 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
516 | struct cfg80211_internal_bss *bss, *res = NULL; | |
ccb6c136 | 517 | unsigned long now = jiffies; |
2a519311 | 518 | |
4ee3e063 BL |
519 | trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, capa_mask, |
520 | capa_val); | |
521 | ||
2a519311 JB |
522 | spin_lock_bh(&dev->bss_lock); |
523 | ||
524 | list_for_each_entry(bss, &dev->bss_list, list) { | |
79420f09 JB |
525 | if ((bss->pub.capability & capa_mask) != capa_val) |
526 | continue; | |
2a519311 JB |
527 | if (channel && bss->pub.channel != channel) |
528 | continue; | |
ccb6c136 JB |
529 | /* Don't get expired BSS structs */ |
530 | if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) && | |
531 | !atomic_read(&bss->hold)) | |
532 | continue; | |
2a519311 JB |
533 | if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { |
534 | res = bss; | |
535 | kref_get(&res->ref); | |
536 | break; | |
537 | } | |
538 | } | |
539 | ||
540 | spin_unlock_bh(&dev->bss_lock); | |
541 | if (!res) | |
542 | return NULL; | |
4ee3e063 | 543 | trace_cfg80211_return_bss(&res->pub); |
2a519311 JB |
544 | return &res->pub; |
545 | } | |
546 | EXPORT_SYMBOL(cfg80211_get_bss); | |
547 | ||
548 | struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy, | |
549 | struct ieee80211_channel *channel, | |
550 | const u8 *meshid, size_t meshidlen, | |
551 | const u8 *meshcfg) | |
552 | { | |
553 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
554 | struct cfg80211_internal_bss *bss, *res = NULL; | |
555 | ||
556 | spin_lock_bh(&dev->bss_lock); | |
557 | ||
558 | list_for_each_entry(bss, &dev->bss_list, list) { | |
559 | if (channel && bss->pub.channel != channel) | |
560 | continue; | |
561 | if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) { | |
562 | res = bss; | |
563 | kref_get(&res->ref); | |
564 | break; | |
565 | } | |
566 | } | |
567 | ||
568 | spin_unlock_bh(&dev->bss_lock); | |
569 | if (!res) | |
570 | return NULL; | |
571 | return &res->pub; | |
572 | } | |
573 | EXPORT_SYMBOL(cfg80211_get_mesh); | |
574 | ||
575 | ||
576 | static void rb_insert_bss(struct cfg80211_registered_device *dev, | |
577 | struct cfg80211_internal_bss *bss) | |
578 | { | |
579 | struct rb_node **p = &dev->bss_tree.rb_node; | |
580 | struct rb_node *parent = NULL; | |
581 | struct cfg80211_internal_bss *tbss; | |
582 | int cmp; | |
583 | ||
584 | while (*p) { | |
585 | parent = *p; | |
586 | tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); | |
587 | ||
4593c4cb | 588 | cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR); |
2a519311 JB |
589 | |
590 | if (WARN_ON(!cmp)) { | |
591 | /* will sort of leak this BSS */ | |
592 | return; | |
593 | } | |
594 | ||
595 | if (cmp < 0) | |
596 | p = &(*p)->rb_left; | |
597 | else | |
598 | p = &(*p)->rb_right; | |
599 | } | |
600 | ||
601 | rb_link_node(&bss->rbn, parent, p); | |
602 | rb_insert_color(&bss->rbn, &dev->bss_tree); | |
603 | } | |
604 | ||
605 | static struct cfg80211_internal_bss * | |
606 | rb_find_bss(struct cfg80211_registered_device *dev, | |
5622f5bb | 607 | struct cfg80211_internal_bss *res, |
4593c4cb | 608 | enum bss_compare_mode mode) |
dd9dfb9f DT |
609 | { |
610 | struct rb_node *n = dev->bss_tree.rb_node; | |
611 | struct cfg80211_internal_bss *bss; | |
612 | int r; | |
613 | ||
614 | while (n) { | |
615 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); | |
4593c4cb | 616 | r = cmp_bss(&res->pub, &bss->pub, mode); |
dd9dfb9f DT |
617 | |
618 | if (r == 0) | |
619 | return bss; | |
620 | else if (r < 0) | |
621 | n = n->rb_left; | |
622 | else | |
623 | n = n->rb_right; | |
624 | } | |
625 | ||
626 | return NULL; | |
627 | } | |
628 | ||
629 | static void | |
630 | copy_hidden_ies(struct cfg80211_internal_bss *res, | |
915de2ff | 631 | struct cfg80211_internal_bss *hidden) |
dd9dfb9f | 632 | { |
9caf0364 JB |
633 | const struct cfg80211_bss_ies *ies; |
634 | ||
635 | if (rcu_access_pointer(res->pub.beacon_ies)) | |
dd9dfb9f DT |
636 | return; |
637 | ||
9caf0364 JB |
638 | ies = rcu_access_pointer(hidden->pub.beacon_ies); |
639 | if (WARN_ON(!ies)) | |
dd9dfb9f DT |
640 | return; |
641 | ||
9caf0364 JB |
642 | ies = kmemdup(ies, sizeof(*ies) + ies->len, GFP_ATOMIC); |
643 | if (unlikely(!ies)) | |
644 | return; | |
645 | rcu_assign_pointer(res->pub.beacon_ies, ies); | |
dd9dfb9f DT |
646 | } |
647 | ||
2a519311 JB |
648 | static struct cfg80211_internal_bss * |
649 | cfg80211_bss_update(struct cfg80211_registered_device *dev, | |
9caf0364 | 650 | struct cfg80211_internal_bss *tmp) |
2a519311 JB |
651 | { |
652 | struct cfg80211_internal_bss *found = NULL; | |
2a519311 | 653 | |
9caf0364 | 654 | if (WARN_ON(!tmp->pub.channel)) |
2a519311 | 655 | return NULL; |
2a519311 | 656 | |
9caf0364 | 657 | tmp->ts = jiffies; |
2a519311 | 658 | |
2a519311 JB |
659 | spin_lock_bh(&dev->bss_lock); |
660 | ||
9caf0364 JB |
661 | if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) { |
662 | spin_unlock_bh(&dev->bss_lock); | |
663 | return NULL; | |
664 | } | |
665 | ||
4593c4cb | 666 | found = rb_find_bss(dev, tmp, BSS_CMP_REGULAR); |
2a519311 | 667 | |
cd1658f5 | 668 | if (found) { |
9caf0364 JB |
669 | found->pub.beacon_interval = tmp->pub.beacon_interval; |
670 | found->pub.tsf = tmp->pub.tsf; | |
671 | found->pub.signal = tmp->pub.signal; | |
672 | found->pub.capability = tmp->pub.capability; | |
673 | found->ts = tmp->ts; | |
cd1658f5 | 674 | |
34a6eddb | 675 | /* Update IEs */ |
9caf0364 JB |
676 | if (rcu_access_pointer(tmp->pub.proberesp_ies)) { |
677 | const struct cfg80211_bss_ies *old; | |
678 | ||
679 | old = rcu_access_pointer(found->pub.proberesp_ies); | |
cd1658f5 | 680 | |
9caf0364 JB |
681 | rcu_assign_pointer(found->pub.proberesp_ies, |
682 | tmp->pub.proberesp_ies); | |
34a6eddb | 683 | /* Override possible earlier Beacon frame IEs */ |
9caf0364 JB |
684 | rcu_assign_pointer(found->pub.ies, |
685 | tmp->pub.proberesp_ies); | |
686 | if (old) | |
687 | kfree_rcu((struct cfg80211_bss_ies *)old, | |
688 | rcu_head); | |
689 | } else if (rcu_access_pointer(tmp->pub.beacon_ies)) { | |
690 | const struct cfg80211_bss_ies *old, *ies; | |
915de2ff | 691 | |
9caf0364 JB |
692 | old = rcu_access_pointer(found->pub.beacon_ies); |
693 | ies = rcu_access_pointer(found->pub.ies); | |
694 | ||
695 | rcu_assign_pointer(found->pub.beacon_ies, | |
696 | tmp->pub.beacon_ies); | |
01123e23 SN |
697 | |
698 | /* Override IEs if they were from a beacon before */ | |
9caf0364 JB |
699 | if (old == ies) |
700 | rcu_assign_pointer(found->pub.ies, | |
701 | tmp->pub.beacon_ies); | |
cd1658f5 | 702 | |
9caf0364 JB |
703 | if (old) |
704 | kfree_rcu((struct cfg80211_bss_ies *)old, | |
705 | rcu_head); | |
706 | } | |
2a519311 | 707 | } else { |
9caf0364 | 708 | struct cfg80211_internal_bss *new; |
dd9dfb9f | 709 | struct cfg80211_internal_bss *hidden; |
9caf0364 | 710 | struct cfg80211_bss_ies *ies; |
dd9dfb9f DT |
711 | |
712 | /* First check if the beacon is a probe response from | |
713 | * a hidden bss. If so, copy beacon ies (with nullified | |
714 | * ssid) into the probe response bss entry (with real ssid). | |
715 | * It is required basically for PSM implementation | |
716 | * (probe responses do not contain tim ie) */ | |
717 | ||
718 | /* TODO: The code is not trying to update existing probe | |
719 | * response bss entries when beacon ies are | |
720 | * getting changed. */ | |
4593c4cb JB |
721 | hidden = rb_find_bss(dev, tmp, BSS_CMP_HIDE_ZLEN); |
722 | if (hidden) { | |
9caf0364 | 723 | copy_hidden_ies(tmp, hidden); |
4593c4cb JB |
724 | } else { |
725 | hidden = rb_find_bss(dev, tmp, BSS_CMP_HIDE_NUL); | |
726 | if (hidden) | |
727 | copy_hidden_ies(tmp, hidden); | |
728 | } | |
9caf0364 JB |
729 | |
730 | /* | |
731 | * create a copy -- the "res" variable that is passed in | |
732 | * is allocated on the stack since it's not needed in the | |
733 | * more common case of an update | |
734 | */ | |
735 | new = kzalloc(sizeof(*new) + dev->wiphy.bss_priv_size, | |
736 | GFP_ATOMIC); | |
737 | if (!new) { | |
738 | ies = (void *)rcu_dereference(tmp->pub.beacon_ies); | |
739 | if (ies) | |
740 | kfree_rcu(ies, rcu_head); | |
741 | ies = (void *)rcu_dereference(tmp->pub.proberesp_ies); | |
742 | if (ies) | |
743 | kfree_rcu(ies, rcu_head); | |
744 | spin_unlock_bh(&dev->bss_lock); | |
745 | return NULL; | |
746 | } | |
747 | memcpy(new, tmp, sizeof(*new)); | |
748 | kref_init(&new->ref); | |
749 | list_add_tail(&new->list, &dev->bss_list); | |
750 | rb_insert_bss(dev, new); | |
751 | found = new; | |
2a519311 JB |
752 | } |
753 | ||
754 | dev->bss_generation++; | |
755 | spin_unlock_bh(&dev->bss_lock); | |
756 | ||
757 | kref_get(&found->ref); | |
758 | return found; | |
759 | } | |
760 | ||
0172bb75 JB |
761 | static struct ieee80211_channel * |
762 | cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen, | |
763 | struct ieee80211_channel *channel) | |
764 | { | |
765 | const u8 *tmp; | |
766 | u32 freq; | |
767 | int channel_number = -1; | |
768 | ||
769 | tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen); | |
770 | if (tmp && tmp[1] == 1) { | |
771 | channel_number = tmp[2]; | |
772 | } else { | |
773 | tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen); | |
774 | if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) { | |
775 | struct ieee80211_ht_operation *htop = (void *)(tmp + 2); | |
776 | ||
777 | channel_number = htop->primary_chan; | |
778 | } | |
779 | } | |
780 | ||
781 | if (channel_number < 0) | |
782 | return channel; | |
783 | ||
784 | freq = ieee80211_channel_to_frequency(channel_number, channel->band); | |
785 | channel = ieee80211_get_channel(wiphy, freq); | |
786 | if (!channel) | |
787 | return NULL; | |
788 | if (channel->flags & IEEE80211_CHAN_DISABLED) | |
789 | return NULL; | |
790 | return channel; | |
791 | } | |
792 | ||
06aa7afa JK |
793 | struct cfg80211_bss* |
794 | cfg80211_inform_bss(struct wiphy *wiphy, | |
795 | struct ieee80211_channel *channel, | |
7b8bcff2 JB |
796 | const u8 *bssid, u64 tsf, u16 capability, |
797 | u16 beacon_interval, const u8 *ie, size_t ielen, | |
06aa7afa JK |
798 | s32 signal, gfp_t gfp) |
799 | { | |
9caf0364 JB |
800 | struct cfg80211_bss_ies *ies; |
801 | struct cfg80211_internal_bss tmp = {}, *res; | |
06aa7afa JK |
802 | |
803 | if (WARN_ON(!wiphy)) | |
804 | return NULL; | |
805 | ||
22fe88d3 | 806 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
06aa7afa JK |
807 | (signal < 0 || signal > 100))) |
808 | return NULL; | |
809 | ||
0172bb75 JB |
810 | channel = cfg80211_get_bss_channel(wiphy, ie, ielen, channel); |
811 | if (!channel) | |
812 | return NULL; | |
813 | ||
9caf0364 JB |
814 | memcpy(tmp.pub.bssid, bssid, ETH_ALEN); |
815 | tmp.pub.channel = channel; | |
816 | tmp.pub.signal = signal; | |
817 | tmp.pub.tsf = tsf; | |
818 | tmp.pub.beacon_interval = beacon_interval; | |
819 | tmp.pub.capability = capability; | |
34a6eddb JM |
820 | /* |
821 | * Since we do not know here whether the IEs are from a Beacon or Probe | |
822 | * Response frame, we need to pick one of the options and only use it | |
823 | * with the driver that does not provide the full Beacon/Probe Response | |
824 | * frame. Use Beacon frame pointer to avoid indicating that this should | |
9caf0364 JB |
825 | * override the iies pointer should we have received an earlier |
826 | * indication of Probe Response data. | |
34a6eddb JM |
827 | * |
828 | * The initial buffer for the IEs is allocated with the BSS entry and | |
829 | * is located after the private area. | |
830 | */ | |
9caf0364 JB |
831 | ies = kmalloc(sizeof(*ies) + ielen, gfp); |
832 | if (!ies) | |
833 | return NULL; | |
834 | ies->len = ielen; | |
835 | memcpy(ies->data, ie, ielen); | |
06aa7afa | 836 | |
9caf0364 JB |
837 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); |
838 | rcu_assign_pointer(tmp.pub.ies, ies); | |
06aa7afa | 839 | |
9caf0364 | 840 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), &tmp); |
06aa7afa JK |
841 | if (!res) |
842 | return NULL; | |
843 | ||
844 | if (res->pub.capability & WLAN_CAPABILITY_ESS) | |
845 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
846 | ||
4ee3e063 | 847 | trace_cfg80211_return_bss(&res->pub); |
06aa7afa JK |
848 | /* cfg80211_bss_update gives us a referenced result */ |
849 | return &res->pub; | |
850 | } | |
851 | EXPORT_SYMBOL(cfg80211_inform_bss); | |
852 | ||
2a519311 JB |
853 | struct cfg80211_bss * |
854 | cfg80211_inform_bss_frame(struct wiphy *wiphy, | |
855 | struct ieee80211_channel *channel, | |
856 | struct ieee80211_mgmt *mgmt, size_t len, | |
77965c97 | 857 | s32 signal, gfp_t gfp) |
2a519311 | 858 | { |
9caf0364 JB |
859 | struct cfg80211_internal_bss tmp = {}, *res; |
860 | struct cfg80211_bss_ies *ies; | |
2a519311 JB |
861 | size_t ielen = len - offsetof(struct ieee80211_mgmt, |
862 | u.probe_resp.variable); | |
bef9bacc | 863 | |
0172bb75 JB |
864 | BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) != |
865 | offsetof(struct ieee80211_mgmt, u.beacon.variable)); | |
866 | ||
4ee3e063 BL |
867 | trace_cfg80211_inform_bss_frame(wiphy, channel, mgmt, len, signal); |
868 | ||
bef9bacc MK |
869 | if (WARN_ON(!mgmt)) |
870 | return NULL; | |
871 | ||
872 | if (WARN_ON(!wiphy)) | |
873 | return NULL; | |
2a519311 | 874 | |
22fe88d3 | 875 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
768be59f | 876 | (signal < 0 || signal > 100))) |
2a519311 JB |
877 | return NULL; |
878 | ||
bef9bacc | 879 | if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) |
2a519311 JB |
880 | return NULL; |
881 | ||
0172bb75 JB |
882 | channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable, |
883 | ielen, channel); | |
884 | if (!channel) | |
885 | return NULL; | |
886 | ||
9caf0364 JB |
887 | ies = kmalloc(sizeof(*ies) + ielen, gfp); |
888 | if (!ies) | |
2a519311 | 889 | return NULL; |
9caf0364 JB |
890 | ies->len = ielen; |
891 | memcpy(ies->data, mgmt->u.probe_resp.variable, ielen); | |
2a519311 | 892 | |
9caf0364 JB |
893 | if (ieee80211_is_probe_resp(mgmt->frame_control)) |
894 | rcu_assign_pointer(tmp.pub.proberesp_ies, ies); | |
895 | else | |
896 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); | |
897 | rcu_assign_pointer(tmp.pub.ies, ies); | |
898 | ||
899 | memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN); | |
900 | tmp.pub.channel = channel; | |
901 | tmp.pub.signal = signal; | |
902 | tmp.pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); | |
903 | tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); | |
904 | tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); | |
905 | ||
906 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), &tmp); | |
2a519311 JB |
907 | if (!res) |
908 | return NULL; | |
909 | ||
e38f8a7a LR |
910 | if (res->pub.capability & WLAN_CAPABILITY_ESS) |
911 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
912 | ||
4ee3e063 | 913 | trace_cfg80211_return_bss(&res->pub); |
2a519311 JB |
914 | /* cfg80211_bss_update gives us a referenced result */ |
915 | return &res->pub; | |
916 | } | |
917 | EXPORT_SYMBOL(cfg80211_inform_bss_frame); | |
918 | ||
4c0c0b75 JB |
919 | void cfg80211_ref_bss(struct cfg80211_bss *pub) |
920 | { | |
921 | struct cfg80211_internal_bss *bss; | |
922 | ||
923 | if (!pub) | |
924 | return; | |
925 | ||
926 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
927 | kref_get(&bss->ref); | |
928 | } | |
929 | EXPORT_SYMBOL(cfg80211_ref_bss); | |
930 | ||
2a519311 JB |
931 | void cfg80211_put_bss(struct cfg80211_bss *pub) |
932 | { | |
933 | struct cfg80211_internal_bss *bss; | |
934 | ||
935 | if (!pub) | |
936 | return; | |
937 | ||
938 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
939 | kref_put(&bss->ref, bss_release); | |
940 | } | |
941 | EXPORT_SYMBOL(cfg80211_put_bss); | |
942 | ||
d491af19 JB |
943 | void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
944 | { | |
945 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
946 | struct cfg80211_internal_bss *bss; | |
947 | ||
948 | if (WARN_ON(!pub)) | |
949 | return; | |
950 | ||
951 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
952 | ||
953 | spin_lock_bh(&dev->bss_lock); | |
3207390a | 954 | if (!list_empty(&bss->list)) { |
2b78ac9b | 955 | __cfg80211_unlink_bss(dev, bss); |
3207390a | 956 | dev->bss_generation++; |
3207390a | 957 | } |
d491af19 | 958 | spin_unlock_bh(&dev->bss_lock); |
d491af19 JB |
959 | } |
960 | EXPORT_SYMBOL(cfg80211_unlink_bss); | |
961 | ||
3d23e349 | 962 | #ifdef CONFIG_CFG80211_WEXT |
2a519311 JB |
963 | int cfg80211_wext_siwscan(struct net_device *dev, |
964 | struct iw_request_info *info, | |
965 | union iwreq_data *wrqu, char *extra) | |
966 | { | |
967 | struct cfg80211_registered_device *rdev; | |
968 | struct wiphy *wiphy; | |
969 | struct iw_scan_req *wreq = NULL; | |
65486c8b | 970 | struct cfg80211_scan_request *creq = NULL; |
2a519311 JB |
971 | int i, err, n_channels = 0; |
972 | enum ieee80211_band band; | |
973 | ||
974 | if (!netif_running(dev)) | |
975 | return -ENETDOWN; | |
976 | ||
b2e3abdc HS |
977 | if (wrqu->data.length == sizeof(struct iw_scan_req)) |
978 | wreq = (struct iw_scan_req *)extra; | |
979 | ||
463d0183 | 980 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
981 | |
982 | if (IS_ERR(rdev)) | |
983 | return PTR_ERR(rdev); | |
984 | ||
985 | if (rdev->scan_req) { | |
986 | err = -EBUSY; | |
987 | goto out; | |
988 | } | |
989 | ||
990 | wiphy = &rdev->wiphy; | |
991 | ||
b2e3abdc HS |
992 | /* Determine number of channels, needed to allocate creq */ |
993 | if (wreq && wreq->num_channels) | |
994 | n_channels = wreq->num_channels; | |
995 | else { | |
996 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) | |
997 | if (wiphy->bands[band]) | |
998 | n_channels += wiphy->bands[band]->n_channels; | |
999 | } | |
2a519311 JB |
1000 | |
1001 | creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + | |
1002 | n_channels * sizeof(void *), | |
1003 | GFP_ATOMIC); | |
1004 | if (!creq) { | |
1005 | err = -ENOMEM; | |
1006 | goto out; | |
1007 | } | |
1008 | ||
1009 | creq->wiphy = wiphy; | |
fd014284 | 1010 | creq->wdev = dev->ieee80211_ptr; |
5ba63533 JB |
1011 | /* SSIDs come after channels */ |
1012 | creq->ssids = (void *)&creq->channels[n_channels]; | |
2a519311 JB |
1013 | creq->n_channels = n_channels; |
1014 | creq->n_ssids = 1; | |
15d6030b | 1015 | creq->scan_start = jiffies; |
2a519311 | 1016 | |
b2e3abdc | 1017 | /* translate "Scan on frequencies" request */ |
2a519311 JB |
1018 | i = 0; |
1019 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
1020 | int j; | |
584991dc | 1021 | |
2a519311 JB |
1022 | if (!wiphy->bands[band]) |
1023 | continue; | |
584991dc | 1024 | |
2a519311 | 1025 | for (j = 0; j < wiphy->bands[band]->n_channels; j++) { |
584991dc JB |
1026 | /* ignore disabled channels */ |
1027 | if (wiphy->bands[band]->channels[j].flags & | |
1028 | IEEE80211_CHAN_DISABLED) | |
1029 | continue; | |
b2e3abdc HS |
1030 | |
1031 | /* If we have a wireless request structure and the | |
1032 | * wireless request specifies frequencies, then search | |
1033 | * for the matching hardware channel. | |
1034 | */ | |
1035 | if (wreq && wreq->num_channels) { | |
1036 | int k; | |
1037 | int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; | |
1038 | for (k = 0; k < wreq->num_channels; k++) { | |
a4e7b730 | 1039 | int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]); |
b2e3abdc HS |
1040 | if (wext_freq == wiphy_freq) |
1041 | goto wext_freq_found; | |
1042 | } | |
1043 | goto wext_freq_not_found; | |
1044 | } | |
1045 | ||
1046 | wext_freq_found: | |
2a519311 JB |
1047 | creq->channels[i] = &wiphy->bands[band]->channels[j]; |
1048 | i++; | |
b2e3abdc | 1049 | wext_freq_not_found: ; |
2a519311 JB |
1050 | } |
1051 | } | |
8862dc5f HS |
1052 | /* No channels found? */ |
1053 | if (!i) { | |
1054 | err = -EINVAL; | |
1055 | goto out; | |
1056 | } | |
2a519311 | 1057 | |
b2e3abdc HS |
1058 | /* Set real number of channels specified in creq->channels[] */ |
1059 | creq->n_channels = i; | |
2a519311 | 1060 | |
b2e3abdc HS |
1061 | /* translate "Scan for SSID" request */ |
1062 | if (wreq) { | |
2a519311 | 1063 | if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { |
65486c8b JB |
1064 | if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { |
1065 | err = -EINVAL; | |
1066 | goto out; | |
1067 | } | |
2a519311 JB |
1068 | memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); |
1069 | creq->ssids[0].ssid_len = wreq->essid_len; | |
1070 | } | |
1071 | if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) | |
1072 | creq->n_ssids = 0; | |
1073 | } | |
1074 | ||
34850ab2 | 1075 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) |
a401d2bb JB |
1076 | if (wiphy->bands[i]) |
1077 | creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1; | |
34850ab2 | 1078 | |
2a519311 | 1079 | rdev->scan_req = creq; |
e35e4d28 | 1080 | err = rdev_scan(rdev, creq); |
2a519311 JB |
1081 | if (err) { |
1082 | rdev->scan_req = NULL; | |
65486c8b | 1083 | /* creq will be freed below */ |
463d0183 | 1084 | } else { |
fd014284 | 1085 | nl80211_send_scan_start(rdev, dev->ieee80211_ptr); |
65486c8b JB |
1086 | /* creq now owned by driver */ |
1087 | creq = NULL; | |
463d0183 JB |
1088 | dev_hold(dev); |
1089 | } | |
2a519311 | 1090 | out: |
65486c8b | 1091 | kfree(creq); |
4d0c8aea | 1092 | cfg80211_unlock_rdev(rdev); |
2a519311 JB |
1093 | return err; |
1094 | } | |
ba44cb72 | 1095 | EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan); |
2a519311 JB |
1096 | |
1097 | static void ieee80211_scan_add_ies(struct iw_request_info *info, | |
9caf0364 | 1098 | const struct cfg80211_bss_ies *ies, |
2a519311 JB |
1099 | char **current_ev, char *end_buf) |
1100 | { | |
9caf0364 | 1101 | const u8 *pos, *end, *next; |
2a519311 JB |
1102 | struct iw_event iwe; |
1103 | ||
9caf0364 | 1104 | if (!ies) |
2a519311 JB |
1105 | return; |
1106 | ||
1107 | /* | |
1108 | * If needed, fragment the IEs buffer (at IE boundaries) into short | |
1109 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. | |
1110 | */ | |
9caf0364 JB |
1111 | pos = ies->data; |
1112 | end = pos + ies->len; | |
2a519311 JB |
1113 | |
1114 | while (end - pos > IW_GENERIC_IE_MAX) { | |
1115 | next = pos + 2 + pos[1]; | |
1116 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) | |
1117 | next = next + 2 + next[1]; | |
1118 | ||
1119 | memset(&iwe, 0, sizeof(iwe)); | |
1120 | iwe.cmd = IWEVGENIE; | |
1121 | iwe.u.data.length = next - pos; | |
1122 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
9caf0364 JB |
1123 | end_buf, &iwe, |
1124 | (void *)pos); | |
2a519311 JB |
1125 | |
1126 | pos = next; | |
1127 | } | |
1128 | ||
1129 | if (end > pos) { | |
1130 | memset(&iwe, 0, sizeof(iwe)); | |
1131 | iwe.cmd = IWEVGENIE; | |
1132 | iwe.u.data.length = end - pos; | |
1133 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
9caf0364 JB |
1134 | end_buf, &iwe, |
1135 | (void *)pos); | |
2a519311 JB |
1136 | } |
1137 | } | |
1138 | ||
cb3a8eec DW |
1139 | static inline unsigned int elapsed_jiffies_msecs(unsigned long start) |
1140 | { | |
1141 | unsigned long end = jiffies; | |
1142 | ||
1143 | if (end >= start) | |
1144 | return jiffies_to_msecs(end - start); | |
1145 | ||
1146 | return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1); | |
1147 | } | |
2a519311 JB |
1148 | |
1149 | static char * | |
77965c97 JB |
1150 | ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, |
1151 | struct cfg80211_internal_bss *bss, char *current_ev, | |
1152 | char *end_buf) | |
2a519311 | 1153 | { |
9caf0364 | 1154 | const struct cfg80211_bss_ies *ies; |
2a519311 | 1155 | struct iw_event iwe; |
9caf0364 | 1156 | const u8 *ie; |
2a519311 | 1157 | u8 *buf, *cfg, *p; |
9caf0364 | 1158 | int rem, i, sig; |
2a519311 JB |
1159 | bool ismesh = false; |
1160 | ||
1161 | memset(&iwe, 0, sizeof(iwe)); | |
1162 | iwe.cmd = SIOCGIWAP; | |
1163 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; | |
1164 | memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); | |
1165 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
1166 | IW_EV_ADDR_LEN); | |
1167 | ||
1168 | memset(&iwe, 0, sizeof(iwe)); | |
1169 | iwe.cmd = SIOCGIWFREQ; | |
1170 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); | |
1171 | iwe.u.freq.e = 0; | |
1172 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
1173 | IW_EV_FREQ_LEN); | |
1174 | ||
1175 | memset(&iwe, 0, sizeof(iwe)); | |
1176 | iwe.cmd = SIOCGIWFREQ; | |
1177 | iwe.u.freq.m = bss->pub.channel->center_freq; | |
1178 | iwe.u.freq.e = 6; | |
1179 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
1180 | IW_EV_FREQ_LEN); | |
1181 | ||
77965c97 | 1182 | if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { |
2a519311 JB |
1183 | memset(&iwe, 0, sizeof(iwe)); |
1184 | iwe.cmd = IWEVQUAL; | |
1185 | iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | | |
1186 | IW_QUAL_NOISE_INVALID | | |
a77b8552 | 1187 | IW_QUAL_QUAL_UPDATED; |
77965c97 | 1188 | switch (wiphy->signal_type) { |
2a519311 | 1189 | case CFG80211_SIGNAL_TYPE_MBM: |
a77b8552 JB |
1190 | sig = bss->pub.signal / 100; |
1191 | iwe.u.qual.level = sig; | |
2a519311 | 1192 | iwe.u.qual.updated |= IW_QUAL_DBM; |
a77b8552 JB |
1193 | if (sig < -110) /* rather bad */ |
1194 | sig = -110; | |
1195 | else if (sig > -40) /* perfect */ | |
1196 | sig = -40; | |
1197 | /* will give a range of 0 .. 70 */ | |
1198 | iwe.u.qual.qual = sig + 110; | |
2a519311 JB |
1199 | break; |
1200 | case CFG80211_SIGNAL_TYPE_UNSPEC: | |
1201 | iwe.u.qual.level = bss->pub.signal; | |
a77b8552 JB |
1202 | /* will give range 0 .. 100 */ |
1203 | iwe.u.qual.qual = bss->pub.signal; | |
2a519311 JB |
1204 | break; |
1205 | default: | |
1206 | /* not reached */ | |
1207 | break; | |
1208 | } | |
1209 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
1210 | &iwe, IW_EV_QUAL_LEN); | |
1211 | } | |
1212 | ||
1213 | memset(&iwe, 0, sizeof(iwe)); | |
1214 | iwe.cmd = SIOCGIWENCODE; | |
1215 | if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) | |
1216 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; | |
1217 | else | |
1218 | iwe.u.data.flags = IW_ENCODE_DISABLED; | |
1219 | iwe.u.data.length = 0; | |
1220 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
1221 | &iwe, ""); | |
1222 | ||
9caf0364 JB |
1223 | rcu_read_lock(); |
1224 | ies = rcu_dereference(bss->pub.ies); | |
1225 | if (ies) { | |
1226 | rem = ies->len; | |
1227 | ie = ies->data; | |
1228 | } else { | |
1229 | rem = 0; | |
1230 | ie = NULL; | |
1231 | } | |
1232 | ||
1233 | while (ies && rem >= 2) { | |
2a519311 JB |
1234 | /* invalid data */ |
1235 | if (ie[1] > rem - 2) | |
1236 | break; | |
1237 | ||
1238 | switch (ie[0]) { | |
1239 | case WLAN_EID_SSID: | |
1240 | memset(&iwe, 0, sizeof(iwe)); | |
1241 | iwe.cmd = SIOCGIWESSID; | |
1242 | iwe.u.data.length = ie[1]; | |
1243 | iwe.u.data.flags = 1; | |
1244 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
9caf0364 | 1245 | &iwe, (u8 *)ie + 2); |
2a519311 JB |
1246 | break; |
1247 | case WLAN_EID_MESH_ID: | |
1248 | memset(&iwe, 0, sizeof(iwe)); | |
1249 | iwe.cmd = SIOCGIWESSID; | |
1250 | iwe.u.data.length = ie[1]; | |
1251 | iwe.u.data.flags = 1; | |
1252 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
9caf0364 | 1253 | &iwe, (u8 *)ie + 2); |
2a519311 JB |
1254 | break; |
1255 | case WLAN_EID_MESH_CONFIG: | |
1256 | ismesh = true; | |
136cfa28 | 1257 | if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) |
2a519311 JB |
1258 | break; |
1259 | buf = kmalloc(50, GFP_ATOMIC); | |
1260 | if (!buf) | |
1261 | break; | |
9caf0364 | 1262 | cfg = (u8 *)ie + 2; |
2a519311 JB |
1263 | memset(&iwe, 0, sizeof(iwe)); |
1264 | iwe.cmd = IWEVCUSTOM; | |
76aa5e70 RP |
1265 | sprintf(buf, "Mesh Network Path Selection Protocol ID: " |
1266 | "0x%02X", cfg[0]); | |
2a519311 JB |
1267 | iwe.u.data.length = strlen(buf); |
1268 | current_ev = iwe_stream_add_point(info, current_ev, | |
1269 | end_buf, | |
1270 | &iwe, buf); | |
76aa5e70 RP |
1271 | sprintf(buf, "Path Selection Metric ID: 0x%02X", |
1272 | cfg[1]); | |
2a519311 JB |
1273 | iwe.u.data.length = strlen(buf); |
1274 | current_ev = iwe_stream_add_point(info, current_ev, | |
1275 | end_buf, | |
1276 | &iwe, buf); | |
76aa5e70 RP |
1277 | sprintf(buf, "Congestion Control Mode ID: 0x%02X", |
1278 | cfg[2]); | |
2a519311 JB |
1279 | iwe.u.data.length = strlen(buf); |
1280 | current_ev = iwe_stream_add_point(info, current_ev, | |
1281 | end_buf, | |
1282 | &iwe, buf); | |
76aa5e70 | 1283 | sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]); |
2a519311 JB |
1284 | iwe.u.data.length = strlen(buf); |
1285 | current_ev = iwe_stream_add_point(info, current_ev, | |
1286 | end_buf, | |
1287 | &iwe, buf); | |
76aa5e70 RP |
1288 | sprintf(buf, "Authentication ID: 0x%02X", cfg[4]); |
1289 | iwe.u.data.length = strlen(buf); | |
1290 | current_ev = iwe_stream_add_point(info, current_ev, | |
1291 | end_buf, | |
1292 | &iwe, buf); | |
1293 | sprintf(buf, "Formation Info: 0x%02X", cfg[5]); | |
1294 | iwe.u.data.length = strlen(buf); | |
1295 | current_ev = iwe_stream_add_point(info, current_ev, | |
1296 | end_buf, | |
1297 | &iwe, buf); | |
1298 | sprintf(buf, "Capabilities: 0x%02X", cfg[6]); | |
2a519311 JB |
1299 | iwe.u.data.length = strlen(buf); |
1300 | current_ev = iwe_stream_add_point(info, current_ev, | |
1301 | end_buf, | |
1302 | &iwe, buf); | |
1303 | kfree(buf); | |
1304 | break; | |
1305 | case WLAN_EID_SUPP_RATES: | |
1306 | case WLAN_EID_EXT_SUPP_RATES: | |
1307 | /* display all supported rates in readable format */ | |
1308 | p = current_ev + iwe_stream_lcp_len(info); | |
1309 | ||
1310 | memset(&iwe, 0, sizeof(iwe)); | |
1311 | iwe.cmd = SIOCGIWRATE; | |
1312 | /* Those two flags are ignored... */ | |
1313 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; | |
1314 | ||
1315 | for (i = 0; i < ie[1]; i++) { | |
1316 | iwe.u.bitrate.value = | |
1317 | ((ie[i + 2] & 0x7f) * 500000); | |
1318 | p = iwe_stream_add_value(info, current_ev, p, | |
1319 | end_buf, &iwe, IW_EV_PARAM_LEN); | |
1320 | } | |
1321 | current_ev = p; | |
1322 | break; | |
1323 | } | |
1324 | rem -= ie[1] + 2; | |
1325 | ie += ie[1] + 2; | |
1326 | } | |
1327 | ||
f64f9e71 JP |
1328 | if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || |
1329 | ismesh) { | |
2a519311 JB |
1330 | memset(&iwe, 0, sizeof(iwe)); |
1331 | iwe.cmd = SIOCGIWMODE; | |
1332 | if (ismesh) | |
1333 | iwe.u.mode = IW_MODE_MESH; | |
1334 | else if (bss->pub.capability & WLAN_CAPABILITY_ESS) | |
1335 | iwe.u.mode = IW_MODE_MASTER; | |
1336 | else | |
1337 | iwe.u.mode = IW_MODE_ADHOC; | |
1338 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
1339 | &iwe, IW_EV_UINT_LEN); | |
1340 | } | |
1341 | ||
1342 | buf = kmalloc(30, GFP_ATOMIC); | |
1343 | if (buf) { | |
1344 | memset(&iwe, 0, sizeof(iwe)); | |
1345 | iwe.cmd = IWEVCUSTOM; | |
1346 | sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf)); | |
1347 | iwe.u.data.length = strlen(buf); | |
1348 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
1349 | &iwe, buf); | |
1350 | memset(&iwe, 0, sizeof(iwe)); | |
1351 | iwe.cmd = IWEVCUSTOM; | |
cb3a8eec DW |
1352 | sprintf(buf, " Last beacon: %ums ago", |
1353 | elapsed_jiffies_msecs(bss->ts)); | |
2a519311 JB |
1354 | iwe.u.data.length = strlen(buf); |
1355 | current_ev = iwe_stream_add_point(info, current_ev, | |
1356 | end_buf, &iwe, buf); | |
1357 | kfree(buf); | |
1358 | } | |
1359 | ||
9caf0364 JB |
1360 | ieee80211_scan_add_ies(info, ies, ¤t_ev, end_buf); |
1361 | rcu_read_unlock(); | |
2a519311 JB |
1362 | |
1363 | return current_ev; | |
1364 | } | |
1365 | ||
1366 | ||
1367 | static int ieee80211_scan_results(struct cfg80211_registered_device *dev, | |
1368 | struct iw_request_info *info, | |
1369 | char *buf, size_t len) | |
1370 | { | |
1371 | char *current_ev = buf; | |
1372 | char *end_buf = buf + len; | |
1373 | struct cfg80211_internal_bss *bss; | |
1374 | ||
1375 | spin_lock_bh(&dev->bss_lock); | |
1376 | cfg80211_bss_expire(dev); | |
1377 | ||
1378 | list_for_each_entry(bss, &dev->bss_list, list) { | |
1379 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { | |
1380 | spin_unlock_bh(&dev->bss_lock); | |
1381 | return -E2BIG; | |
1382 | } | |
77965c97 JB |
1383 | current_ev = ieee80211_bss(&dev->wiphy, info, bss, |
1384 | current_ev, end_buf); | |
2a519311 JB |
1385 | } |
1386 | spin_unlock_bh(&dev->bss_lock); | |
1387 | return current_ev - buf; | |
1388 | } | |
1389 | ||
1390 | ||
1391 | int cfg80211_wext_giwscan(struct net_device *dev, | |
1392 | struct iw_request_info *info, | |
1393 | struct iw_point *data, char *extra) | |
1394 | { | |
1395 | struct cfg80211_registered_device *rdev; | |
1396 | int res; | |
1397 | ||
1398 | if (!netif_running(dev)) | |
1399 | return -ENETDOWN; | |
1400 | ||
463d0183 | 1401 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
1402 | |
1403 | if (IS_ERR(rdev)) | |
1404 | return PTR_ERR(rdev); | |
1405 | ||
1406 | if (rdev->scan_req) { | |
1407 | res = -EAGAIN; | |
1408 | goto out; | |
1409 | } | |
1410 | ||
1411 | res = ieee80211_scan_results(rdev, info, extra, data->length); | |
1412 | data->length = 0; | |
1413 | if (res >= 0) { | |
1414 | data->length = res; | |
1415 | res = 0; | |
1416 | } | |
1417 | ||
1418 | out: | |
4d0c8aea | 1419 | cfg80211_unlock_rdev(rdev); |
2a519311 JB |
1420 | return res; |
1421 | } | |
ba44cb72 | 1422 | EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan); |
2a519311 | 1423 | #endif |