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Commit | Line | Data |
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2a519311 JB |
1 | /* |
2 | * cfg80211 scan result handling | |
3 | * | |
4 | * Copyright 2008 Johannes Berg <johannes@sipsolutions.net> | |
2740f0cf | 5 | * Copyright 2013-2014 Intel Mobile Communications GmbH |
2a519311 JB |
6 | */ |
7 | #include <linux/kernel.h> | |
5a0e3ad6 | 8 | #include <linux/slab.h> |
2a519311 JB |
9 | #include <linux/module.h> |
10 | #include <linux/netdevice.h> | |
11 | #include <linux/wireless.h> | |
12 | #include <linux/nl80211.h> | |
13 | #include <linux/etherdevice.h> | |
14 | #include <net/arp.h> | |
15 | #include <net/cfg80211.h> | |
262eb9b2 | 16 | #include <net/cfg80211-wext.h> |
2a519311 JB |
17 | #include <net/iw_handler.h> |
18 | #include "core.h" | |
19 | #include "nl80211.h" | |
a9a11622 | 20 | #include "wext-compat.h" |
e35e4d28 | 21 | #include "rdev-ops.h" |
2a519311 | 22 | |
776b3580 JB |
23 | /** |
24 | * DOC: BSS tree/list structure | |
25 | * | |
26 | * At the top level, the BSS list is kept in both a list in each | |
27 | * registered device (@bss_list) as well as an RB-tree for faster | |
28 | * lookup. In the RB-tree, entries can be looked up using their | |
29 | * channel, MESHID, MESHCONF (for MBSSes) or channel, BSSID, SSID | |
30 | * for other BSSes. | |
31 | * | |
32 | * Due to the possibility of hidden SSIDs, there's a second level | |
33 | * structure, the "hidden_list" and "hidden_beacon_bss" pointer. | |
34 | * The hidden_list connects all BSSes belonging to a single AP | |
35 | * that has a hidden SSID, and connects beacon and probe response | |
36 | * entries. For a probe response entry for a hidden SSID, the | |
37 | * hidden_beacon_bss pointer points to the BSS struct holding the | |
38 | * beacon's information. | |
39 | * | |
40 | * Reference counting is done for all these references except for | |
41 | * the hidden_list, so that a beacon BSS struct that is otherwise | |
42 | * not referenced has one reference for being on the bss_list and | |
43 | * one for each probe response entry that points to it using the | |
44 | * hidden_beacon_bss pointer. When a BSS struct that has such a | |
45 | * pointer is get/put, the refcount update is also propagated to | |
46 | * the referenced struct, this ensure that it cannot get removed | |
47 | * while somebody is using the probe response version. | |
48 | * | |
49 | * Note that the hidden_beacon_bss pointer never changes, due to | |
50 | * the reference counting. Therefore, no locking is needed for | |
51 | * it. | |
52 | * | |
53 | * Also note that the hidden_beacon_bss pointer is only relevant | |
54 | * if the driver uses something other than the IEs, e.g. private | |
55 | * data stored stored in the BSS struct, since the beacon IEs are | |
56 | * also linked into the probe response struct. | |
57 | */ | |
58 | ||
f9616e0f | 59 | #define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ) |
2a519311 | 60 | |
776b3580 | 61 | static void bss_free(struct cfg80211_internal_bss *bss) |
e8e27c66 | 62 | { |
9caf0364 | 63 | struct cfg80211_bss_ies *ies; |
b629ea3d JB |
64 | |
65 | if (WARN_ON(atomic_read(&bss->hold))) | |
66 | return; | |
67 | ||
9caf0364 | 68 | ies = (void *)rcu_access_pointer(bss->pub.beacon_ies); |
776b3580 | 69 | if (ies && !bss->pub.hidden_beacon_bss) |
9caf0364 JB |
70 | kfree_rcu(ies, rcu_head); |
71 | ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies); | |
72 | if (ies) | |
73 | kfree_rcu(ies, rcu_head); | |
e8e27c66 | 74 | |
776b3580 JB |
75 | /* |
76 | * This happens when the module is removed, it doesn't | |
77 | * really matter any more save for completeness | |
78 | */ | |
79 | if (!list_empty(&bss->hidden_list)) | |
80 | list_del(&bss->hidden_list); | |
81 | ||
e8e27c66 AK |
82 | kfree(bss); |
83 | } | |
84 | ||
1b8ec87a | 85 | static inline void bss_ref_get(struct cfg80211_registered_device *rdev, |
776b3580 | 86 | struct cfg80211_internal_bss *bss) |
0532d4f1 | 87 | { |
1b8ec87a | 88 | lockdep_assert_held(&rdev->bss_lock); |
776b3580 JB |
89 | |
90 | bss->refcount++; | |
91 | if (bss->pub.hidden_beacon_bss) { | |
92 | bss = container_of(bss->pub.hidden_beacon_bss, | |
93 | struct cfg80211_internal_bss, | |
94 | pub); | |
95 | bss->refcount++; | |
96 | } | |
0532d4f1 JB |
97 | } |
98 | ||
1b8ec87a | 99 | static inline void bss_ref_put(struct cfg80211_registered_device *rdev, |
776b3580 | 100 | struct cfg80211_internal_bss *bss) |
0532d4f1 | 101 | { |
1b8ec87a | 102 | lockdep_assert_held(&rdev->bss_lock); |
776b3580 JB |
103 | |
104 | if (bss->pub.hidden_beacon_bss) { | |
105 | struct cfg80211_internal_bss *hbss; | |
106 | hbss = container_of(bss->pub.hidden_beacon_bss, | |
107 | struct cfg80211_internal_bss, | |
108 | pub); | |
109 | hbss->refcount--; | |
110 | if (hbss->refcount == 0) | |
111 | bss_free(hbss); | |
112 | } | |
113 | bss->refcount--; | |
114 | if (bss->refcount == 0) | |
115 | bss_free(bss); | |
0532d4f1 JB |
116 | } |
117 | ||
1b8ec87a | 118 | static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev, |
e8e27c66 AK |
119 | struct cfg80211_internal_bss *bss) |
120 | { | |
1b8ec87a | 121 | lockdep_assert_held(&rdev->bss_lock); |
4b1af479 | 122 | |
776b3580 JB |
123 | if (!list_empty(&bss->hidden_list)) { |
124 | /* | |
125 | * don't remove the beacon entry if it has | |
126 | * probe responses associated with it | |
127 | */ | |
128 | if (!bss->pub.hidden_beacon_bss) | |
129 | return false; | |
130 | /* | |
131 | * if it's a probe response entry break its | |
132 | * link to the other entries in the group | |
133 | */ | |
134 | list_del_init(&bss->hidden_list); | |
135 | } | |
136 | ||
e8e27c66 | 137 | list_del_init(&bss->list); |
1b8ec87a ZG |
138 | rb_erase(&bss->rbn, &rdev->bss_tree); |
139 | bss_ref_put(rdev, bss); | |
776b3580 | 140 | return true; |
e8e27c66 AK |
141 | } |
142 | ||
1b8ec87a | 143 | static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev, |
15d6030b SL |
144 | unsigned long expire_time) |
145 | { | |
146 | struct cfg80211_internal_bss *bss, *tmp; | |
147 | bool expired = false; | |
148 | ||
1b8ec87a | 149 | lockdep_assert_held(&rdev->bss_lock); |
4b1af479 | 150 | |
1b8ec87a | 151 | list_for_each_entry_safe(bss, tmp, &rdev->bss_list, list) { |
15d6030b SL |
152 | if (atomic_read(&bss->hold)) |
153 | continue; | |
154 | if (!time_after(expire_time, bss->ts)) | |
155 | continue; | |
156 | ||
1b8ec87a | 157 | if (__cfg80211_unlink_bss(rdev, bss)) |
776b3580 | 158 | expired = true; |
15d6030b SL |
159 | } |
160 | ||
161 | if (expired) | |
1b8ec87a | 162 | rdev->bss_generation++; |
15d6030b SL |
163 | } |
164 | ||
f9d15d16 JB |
165 | void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, |
166 | bool send_message) | |
2a519311 | 167 | { |
667503dd | 168 | struct cfg80211_scan_request *request; |
fd014284 | 169 | struct wireless_dev *wdev; |
f9d15d16 | 170 | struct sk_buff *msg; |
3d23e349 | 171 | #ifdef CONFIG_CFG80211_WEXT |
2a519311 JB |
172 | union iwreq_data wrqu; |
173 | #endif | |
174 | ||
5fe231e8 | 175 | ASSERT_RTNL(); |
01a0ac41 | 176 | |
f9d15d16 JB |
177 | if (rdev->scan_msg) { |
178 | nl80211_send_scan_result(rdev, rdev->scan_msg); | |
179 | rdev->scan_msg = NULL; | |
180 | return; | |
181 | } | |
667503dd | 182 | |
f9d15d16 | 183 | request = rdev->scan_req; |
01a0ac41 JB |
184 | if (!request) |
185 | return; | |
186 | ||
fd014284 | 187 | wdev = request->wdev; |
2a519311 | 188 | |
6829c878 JB |
189 | /* |
190 | * This must be before sending the other events! | |
191 | * Otherwise, wpa_supplicant gets completely confused with | |
192 | * wext events. | |
193 | */ | |
fd014284 JB |
194 | if (wdev->netdev) |
195 | cfg80211_sme_scan_done(wdev->netdev); | |
6829c878 | 196 | |
f9d15d16 JB |
197 | if (!request->aborted && |
198 | request->flags & NL80211_SCAN_FLAG_FLUSH) { | |
199 | /* flush entries from previous scans */ | |
200 | spin_lock_bh(&rdev->bss_lock); | |
201 | __cfg80211_bss_expire(rdev, request->scan_start); | |
202 | spin_unlock_bh(&rdev->bss_lock); | |
15d6030b | 203 | } |
2a519311 | 204 | |
f9d15d16 JB |
205 | msg = nl80211_build_scan_msg(rdev, wdev, request->aborted); |
206 | ||
3d23e349 | 207 | #ifdef CONFIG_CFG80211_WEXT |
fd014284 | 208 | if (wdev->netdev && !request->aborted) { |
2a519311 JB |
209 | memset(&wrqu, 0, sizeof(wrqu)); |
210 | ||
fd014284 | 211 | wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL); |
2a519311 JB |
212 | } |
213 | #endif | |
214 | ||
fd014284 JB |
215 | if (wdev->netdev) |
216 | dev_put(wdev->netdev); | |
2a519311 | 217 | |
36e6fea8 | 218 | rdev->scan_req = NULL; |
4a58e7c3 | 219 | kfree(request); |
f9d15d16 JB |
220 | |
221 | if (!send_message) | |
222 | rdev->scan_msg = msg; | |
223 | else | |
224 | nl80211_send_scan_result(rdev, msg); | |
2a519311 | 225 | } |
667503dd | 226 | |
36e6fea8 JB |
227 | void __cfg80211_scan_done(struct work_struct *wk) |
228 | { | |
229 | struct cfg80211_registered_device *rdev; | |
230 | ||
231 | rdev = container_of(wk, struct cfg80211_registered_device, | |
232 | scan_done_wk); | |
233 | ||
5fe231e8 | 234 | rtnl_lock(); |
f9d15d16 | 235 | ___cfg80211_scan_done(rdev, true); |
5fe231e8 | 236 | rtnl_unlock(); |
36e6fea8 JB |
237 | } |
238 | ||
667503dd JB |
239 | void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted) |
240 | { | |
4ee3e063 | 241 | trace_cfg80211_scan_done(request, aborted); |
f26cbf40 | 242 | WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req); |
667503dd JB |
243 | |
244 | request->aborted = aborted; | |
5fe231e8 | 245 | request->notified = true; |
f26cbf40 | 246 | queue_work(cfg80211_wq, &wiphy_to_rdev(request->wiphy)->scan_done_wk); |
667503dd | 247 | } |
2a519311 JB |
248 | EXPORT_SYMBOL(cfg80211_scan_done); |
249 | ||
807f8a8c LC |
250 | void __cfg80211_sched_scan_results(struct work_struct *wk) |
251 | { | |
252 | struct cfg80211_registered_device *rdev; | |
15d6030b | 253 | struct cfg80211_sched_scan_request *request; |
807f8a8c LC |
254 | |
255 | rdev = container_of(wk, struct cfg80211_registered_device, | |
256 | sched_scan_results_wk); | |
257 | ||
5fe231e8 | 258 | rtnl_lock(); |
807f8a8c | 259 | |
79845c66 JB |
260 | request = rdev->sched_scan_req; |
261 | ||
807f8a8c | 262 | /* we don't have sched_scan_req anymore if the scan is stopping */ |
15d6030b SL |
263 | if (request) { |
264 | if (request->flags & NL80211_SCAN_FLAG_FLUSH) { | |
265 | /* flush entries from previous scans */ | |
266 | spin_lock_bh(&rdev->bss_lock); | |
267 | __cfg80211_bss_expire(rdev, request->scan_start); | |
268 | spin_unlock_bh(&rdev->bss_lock); | |
269 | request->scan_start = | |
270 | jiffies + msecs_to_jiffies(request->interval); | |
271 | } | |
272 | nl80211_send_sched_scan_results(rdev, request->dev); | |
273 | } | |
807f8a8c | 274 | |
5fe231e8 | 275 | rtnl_unlock(); |
807f8a8c LC |
276 | } |
277 | ||
278 | void cfg80211_sched_scan_results(struct wiphy *wiphy) | |
279 | { | |
4ee3e063 | 280 | trace_cfg80211_sched_scan_results(wiphy); |
807f8a8c | 281 | /* ignore if we're not scanning */ |
f26cbf40 | 282 | if (wiphy_to_rdev(wiphy)->sched_scan_req) |
807f8a8c | 283 | queue_work(cfg80211_wq, |
f26cbf40 | 284 | &wiphy_to_rdev(wiphy)->sched_scan_results_wk); |
807f8a8c LC |
285 | } |
286 | EXPORT_SYMBOL(cfg80211_sched_scan_results); | |
287 | ||
792e6aa7 | 288 | void cfg80211_sched_scan_stopped_rtnl(struct wiphy *wiphy) |
807f8a8c | 289 | { |
f26cbf40 | 290 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
807f8a8c | 291 | |
792e6aa7 EP |
292 | ASSERT_RTNL(); |
293 | ||
4ee3e063 BL |
294 | trace_cfg80211_sched_scan_stopped(wiphy); |
295 | ||
807f8a8c | 296 | __cfg80211_stop_sched_scan(rdev, true); |
792e6aa7 EP |
297 | } |
298 | EXPORT_SYMBOL(cfg80211_sched_scan_stopped_rtnl); | |
299 | ||
300 | void cfg80211_sched_scan_stopped(struct wiphy *wiphy) | |
301 | { | |
302 | rtnl_lock(); | |
303 | cfg80211_sched_scan_stopped_rtnl(wiphy); | |
5fe231e8 | 304 | rtnl_unlock(); |
807f8a8c | 305 | } |
807f8a8c LC |
306 | EXPORT_SYMBOL(cfg80211_sched_scan_stopped); |
307 | ||
308 | int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev, | |
309 | bool driver_initiated) | |
310 | { | |
807f8a8c LC |
311 | struct net_device *dev; |
312 | ||
5fe231e8 | 313 | ASSERT_RTNL(); |
807f8a8c LC |
314 | |
315 | if (!rdev->sched_scan_req) | |
1a84ff75 | 316 | return -ENOENT; |
807f8a8c LC |
317 | |
318 | dev = rdev->sched_scan_req->dev; | |
319 | ||
85a9994a | 320 | if (!driver_initiated) { |
e35e4d28 | 321 | int err = rdev_sched_scan_stop(rdev, dev); |
85a9994a LC |
322 | if (err) |
323 | return err; | |
324 | } | |
807f8a8c LC |
325 | |
326 | nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED); | |
327 | ||
328 | kfree(rdev->sched_scan_req); | |
329 | rdev->sched_scan_req = NULL; | |
330 | ||
3b4670ff | 331 | return 0; |
807f8a8c LC |
332 | } |
333 | ||
1b8ec87a | 334 | void cfg80211_bss_age(struct cfg80211_registered_device *rdev, |
cb3a8eec DW |
335 | unsigned long age_secs) |
336 | { | |
337 | struct cfg80211_internal_bss *bss; | |
338 | unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); | |
339 | ||
1b8ec87a ZG |
340 | spin_lock_bh(&rdev->bss_lock); |
341 | list_for_each_entry(bss, &rdev->bss_list, list) | |
cb3a8eec | 342 | bss->ts -= age_jiffies; |
1b8ec87a | 343 | spin_unlock_bh(&rdev->bss_lock); |
cb3a8eec DW |
344 | } |
345 | ||
1b8ec87a | 346 | void cfg80211_bss_expire(struct cfg80211_registered_device *rdev) |
2a519311 | 347 | { |
1b8ec87a | 348 | __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE); |
2a519311 JB |
349 | } |
350 | ||
c21dbf92 | 351 | const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len) |
2a519311 | 352 | { |
c21dbf92 | 353 | while (len > 2 && ies[0] != eid) { |
2a519311 JB |
354 | len -= ies[1] + 2; |
355 | ies += ies[1] + 2; | |
356 | } | |
357 | if (len < 2) | |
358 | return NULL; | |
359 | if (len < 2 + ies[1]) | |
360 | return NULL; | |
361 | return ies; | |
362 | } | |
c21dbf92 | 363 | EXPORT_SYMBOL(cfg80211_find_ie); |
2a519311 | 364 | |
0c28ec58 EP |
365 | const u8 *cfg80211_find_vendor_ie(unsigned int oui, u8 oui_type, |
366 | const u8 *ies, int len) | |
367 | { | |
368 | struct ieee80211_vendor_ie *ie; | |
369 | const u8 *pos = ies, *end = ies + len; | |
370 | int ie_oui; | |
371 | ||
372 | while (pos < end) { | |
373 | pos = cfg80211_find_ie(WLAN_EID_VENDOR_SPECIFIC, pos, | |
374 | end - pos); | |
375 | if (!pos) | |
376 | return NULL; | |
377 | ||
0c28ec58 | 378 | ie = (struct ieee80211_vendor_ie *)pos; |
6719429d LC |
379 | |
380 | /* make sure we can access ie->len */ | |
381 | BUILD_BUG_ON(offsetof(struct ieee80211_vendor_ie, len) != 1); | |
382 | ||
383 | if (ie->len < sizeof(*ie)) | |
384 | goto cont; | |
385 | ||
0c28ec58 EP |
386 | ie_oui = ie->oui[0] << 16 | ie->oui[1] << 8 | ie->oui[2]; |
387 | if (ie_oui == oui && ie->oui_type == oui_type) | |
388 | return pos; | |
6719429d | 389 | cont: |
0c28ec58 EP |
390 | pos += 2 + ie->len; |
391 | } | |
392 | return NULL; | |
393 | } | |
394 | EXPORT_SYMBOL(cfg80211_find_vendor_ie); | |
395 | ||
915de2ff | 396 | static bool is_bss(struct cfg80211_bss *a, const u8 *bssid, |
2a519311 JB |
397 | const u8 *ssid, size_t ssid_len) |
398 | { | |
9caf0364 | 399 | const struct cfg80211_bss_ies *ies; |
2a519311 JB |
400 | const u8 *ssidie; |
401 | ||
ac422d3c | 402 | if (bssid && !ether_addr_equal(a->bssid, bssid)) |
2a519311 JB |
403 | return false; |
404 | ||
79420f09 JB |
405 | if (!ssid) |
406 | return true; | |
407 | ||
9caf0364 JB |
408 | ies = rcu_access_pointer(a->ies); |
409 | if (!ies) | |
410 | return false; | |
411 | ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); | |
2a519311 JB |
412 | if (!ssidie) |
413 | return false; | |
414 | if (ssidie[1] != ssid_len) | |
415 | return false; | |
416 | return memcmp(ssidie + 2, ssid, ssid_len) == 0; | |
417 | } | |
418 | ||
4593c4cb JB |
419 | /** |
420 | * enum bss_compare_mode - BSS compare mode | |
421 | * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find) | |
422 | * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode | |
423 | * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode | |
424 | */ | |
425 | enum bss_compare_mode { | |
426 | BSS_CMP_REGULAR, | |
427 | BSS_CMP_HIDE_ZLEN, | |
428 | BSS_CMP_HIDE_NUL, | |
429 | }; | |
430 | ||
dd9dfb9f | 431 | static int cmp_bss(struct cfg80211_bss *a, |
5622f5bb | 432 | struct cfg80211_bss *b, |
4593c4cb | 433 | enum bss_compare_mode mode) |
dd9dfb9f | 434 | { |
9caf0364 | 435 | const struct cfg80211_bss_ies *a_ies, *b_ies; |
3af6341c JB |
436 | const u8 *ie1 = NULL; |
437 | const u8 *ie2 = NULL; | |
5622f5bb | 438 | int i, r; |
dd9dfb9f | 439 | |
3af6341c JB |
440 | if (a->channel != b->channel) |
441 | return b->channel->center_freq - a->channel->center_freq; | |
dd9dfb9f | 442 | |
9caf0364 JB |
443 | a_ies = rcu_access_pointer(a->ies); |
444 | if (!a_ies) | |
445 | return -1; | |
446 | b_ies = rcu_access_pointer(b->ies); | |
447 | if (!b_ies) | |
448 | return 1; | |
449 | ||
3af6341c JB |
450 | if (WLAN_CAPABILITY_IS_STA_BSS(a->capability)) |
451 | ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID, | |
452 | a_ies->data, a_ies->len); | |
453 | if (WLAN_CAPABILITY_IS_STA_BSS(b->capability)) | |
454 | ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID, | |
455 | b_ies->data, b_ies->len); | |
456 | if (ie1 && ie2) { | |
457 | int mesh_id_cmp; | |
458 | ||
459 | if (ie1[1] == ie2[1]) | |
460 | mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]); | |
461 | else | |
462 | mesh_id_cmp = ie2[1] - ie1[1]; | |
463 | ||
464 | ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, | |
465 | a_ies->data, a_ies->len); | |
466 | ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, | |
467 | b_ies->data, b_ies->len); | |
468 | if (ie1 && ie2) { | |
469 | if (mesh_id_cmp) | |
470 | return mesh_id_cmp; | |
471 | if (ie1[1] != ie2[1]) | |
472 | return ie2[1] - ie1[1]; | |
473 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); | |
474 | } | |
475 | } | |
476 | ||
3af6341c JB |
477 | r = memcmp(a->bssid, b->bssid, sizeof(a->bssid)); |
478 | if (r) | |
479 | return r; | |
480 | ||
9caf0364 JB |
481 | ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len); |
482 | ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len); | |
dd9dfb9f | 483 | |
5622f5bb JB |
484 | if (!ie1 && !ie2) |
485 | return 0; | |
486 | ||
f94f8b16 | 487 | /* |
5622f5bb JB |
488 | * Note that with "hide_ssid", the function returns a match if |
489 | * the already-present BSS ("b") is a hidden SSID beacon for | |
490 | * the new BSS ("a"). | |
f94f8b16 | 491 | */ |
dd9dfb9f DT |
492 | |
493 | /* sort missing IE before (left of) present IE */ | |
494 | if (!ie1) | |
495 | return -1; | |
496 | if (!ie2) | |
497 | return 1; | |
498 | ||
4593c4cb JB |
499 | switch (mode) { |
500 | case BSS_CMP_HIDE_ZLEN: | |
501 | /* | |
502 | * In ZLEN mode we assume the BSS entry we're | |
503 | * looking for has a zero-length SSID. So if | |
504 | * the one we're looking at right now has that, | |
505 | * return 0. Otherwise, return the difference | |
506 | * in length, but since we're looking for the | |
507 | * 0-length it's really equivalent to returning | |
508 | * the length of the one we're looking at. | |
509 | * | |
510 | * No content comparison is needed as we assume | |
511 | * the content length is zero. | |
512 | */ | |
513 | return ie2[1]; | |
514 | case BSS_CMP_REGULAR: | |
515 | default: | |
516 | /* sort by length first, then by contents */ | |
517 | if (ie1[1] != ie2[1]) | |
518 | return ie2[1] - ie1[1]; | |
5622f5bb | 519 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); |
4593c4cb JB |
520 | case BSS_CMP_HIDE_NUL: |
521 | if (ie1[1] != ie2[1]) | |
522 | return ie2[1] - ie1[1]; | |
523 | /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */ | |
524 | for (i = 0; i < ie2[1]; i++) | |
525 | if (ie2[i + 2]) | |
526 | return -1; | |
527 | return 0; | |
528 | } | |
dd9dfb9f DT |
529 | } |
530 | ||
0e3a39b5 | 531 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
2a519311 JB |
532 | struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, |
533 | struct ieee80211_channel *channel, | |
534 | const u8 *bssid, | |
79420f09 JB |
535 | const u8 *ssid, size_t ssid_len, |
536 | u16 capa_mask, u16 capa_val) | |
2a519311 | 537 | { |
f26cbf40 | 538 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
2a519311 | 539 | struct cfg80211_internal_bss *bss, *res = NULL; |
ccb6c136 | 540 | unsigned long now = jiffies; |
2a519311 | 541 | |
4ee3e063 BL |
542 | trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, capa_mask, |
543 | capa_val); | |
544 | ||
1b8ec87a | 545 | spin_lock_bh(&rdev->bss_lock); |
2a519311 | 546 | |
1b8ec87a | 547 | list_for_each_entry(bss, &rdev->bss_list, list) { |
79420f09 JB |
548 | if ((bss->pub.capability & capa_mask) != capa_val) |
549 | continue; | |
2a519311 JB |
550 | if (channel && bss->pub.channel != channel) |
551 | continue; | |
c14a7400 JB |
552 | if (!is_valid_ether_addr(bss->pub.bssid)) |
553 | continue; | |
ccb6c136 JB |
554 | /* Don't get expired BSS structs */ |
555 | if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) && | |
556 | !atomic_read(&bss->hold)) | |
557 | continue; | |
2a519311 JB |
558 | if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { |
559 | res = bss; | |
1b8ec87a | 560 | bss_ref_get(rdev, res); |
2a519311 JB |
561 | break; |
562 | } | |
563 | } | |
564 | ||
1b8ec87a | 565 | spin_unlock_bh(&rdev->bss_lock); |
2a519311 JB |
566 | if (!res) |
567 | return NULL; | |
4ee3e063 | 568 | trace_cfg80211_return_bss(&res->pub); |
2a519311 JB |
569 | return &res->pub; |
570 | } | |
571 | EXPORT_SYMBOL(cfg80211_get_bss); | |
572 | ||
1b8ec87a | 573 | static void rb_insert_bss(struct cfg80211_registered_device *rdev, |
2a519311 JB |
574 | struct cfg80211_internal_bss *bss) |
575 | { | |
1b8ec87a | 576 | struct rb_node **p = &rdev->bss_tree.rb_node; |
2a519311 JB |
577 | struct rb_node *parent = NULL; |
578 | struct cfg80211_internal_bss *tbss; | |
579 | int cmp; | |
580 | ||
581 | while (*p) { | |
582 | parent = *p; | |
583 | tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); | |
584 | ||
4593c4cb | 585 | cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR); |
2a519311 JB |
586 | |
587 | if (WARN_ON(!cmp)) { | |
588 | /* will sort of leak this BSS */ | |
589 | return; | |
590 | } | |
591 | ||
592 | if (cmp < 0) | |
593 | p = &(*p)->rb_left; | |
594 | else | |
595 | p = &(*p)->rb_right; | |
596 | } | |
597 | ||
598 | rb_link_node(&bss->rbn, parent, p); | |
1b8ec87a | 599 | rb_insert_color(&bss->rbn, &rdev->bss_tree); |
2a519311 JB |
600 | } |
601 | ||
602 | static struct cfg80211_internal_bss * | |
1b8ec87a | 603 | rb_find_bss(struct cfg80211_registered_device *rdev, |
5622f5bb | 604 | struct cfg80211_internal_bss *res, |
4593c4cb | 605 | enum bss_compare_mode mode) |
dd9dfb9f | 606 | { |
1b8ec87a | 607 | struct rb_node *n = rdev->bss_tree.rb_node; |
dd9dfb9f DT |
608 | struct cfg80211_internal_bss *bss; |
609 | int r; | |
610 | ||
611 | while (n) { | |
612 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); | |
4593c4cb | 613 | r = cmp_bss(&res->pub, &bss->pub, mode); |
dd9dfb9f DT |
614 | |
615 | if (r == 0) | |
616 | return bss; | |
617 | else if (r < 0) | |
618 | n = n->rb_left; | |
619 | else | |
620 | n = n->rb_right; | |
621 | } | |
622 | ||
623 | return NULL; | |
624 | } | |
625 | ||
1b8ec87a | 626 | static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev, |
776b3580 | 627 | struct cfg80211_internal_bss *new) |
dd9dfb9f | 628 | { |
9caf0364 | 629 | const struct cfg80211_bss_ies *ies; |
776b3580 JB |
630 | struct cfg80211_internal_bss *bss; |
631 | const u8 *ie; | |
632 | int i, ssidlen; | |
633 | u8 fold = 0; | |
9caf0364 | 634 | |
776b3580 | 635 | ies = rcu_access_pointer(new->pub.beacon_ies); |
9caf0364 | 636 | if (WARN_ON(!ies)) |
776b3580 | 637 | return false; |
dd9dfb9f | 638 | |
776b3580 JB |
639 | ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); |
640 | if (!ie) { | |
641 | /* nothing to do */ | |
642 | return true; | |
643 | } | |
644 | ||
645 | ssidlen = ie[1]; | |
646 | for (i = 0; i < ssidlen; i++) | |
647 | fold |= ie[2 + i]; | |
648 | ||
649 | if (fold) { | |
650 | /* not a hidden SSID */ | |
651 | return true; | |
652 | } | |
653 | ||
654 | /* This is the bad part ... */ | |
655 | ||
1b8ec87a | 656 | list_for_each_entry(bss, &rdev->bss_list, list) { |
776b3580 JB |
657 | if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid)) |
658 | continue; | |
659 | if (bss->pub.channel != new->pub.channel) | |
660 | continue; | |
dcd6eac1 SW |
661 | if (bss->pub.scan_width != new->pub.scan_width) |
662 | continue; | |
776b3580 JB |
663 | if (rcu_access_pointer(bss->pub.beacon_ies)) |
664 | continue; | |
665 | ies = rcu_access_pointer(bss->pub.ies); | |
666 | if (!ies) | |
667 | continue; | |
668 | ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); | |
669 | if (!ie) | |
670 | continue; | |
671 | if (ssidlen && ie[1] != ssidlen) | |
672 | continue; | |
776b3580 JB |
673 | if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss)) |
674 | continue; | |
675 | if (WARN_ON_ONCE(!list_empty(&bss->hidden_list))) | |
676 | list_del(&bss->hidden_list); | |
677 | /* combine them */ | |
678 | list_add(&bss->hidden_list, &new->hidden_list); | |
679 | bss->pub.hidden_beacon_bss = &new->pub; | |
680 | new->refcount += bss->refcount; | |
681 | rcu_assign_pointer(bss->pub.beacon_ies, | |
682 | new->pub.beacon_ies); | |
683 | } | |
684 | ||
685 | return true; | |
dd9dfb9f DT |
686 | } |
687 | ||
0e3a39b5 | 688 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
2a519311 | 689 | static struct cfg80211_internal_bss * |
1b8ec87a | 690 | cfg80211_bss_update(struct cfg80211_registered_device *rdev, |
3afc2167 EG |
691 | struct cfg80211_internal_bss *tmp, |
692 | bool signal_valid) | |
2a519311 JB |
693 | { |
694 | struct cfg80211_internal_bss *found = NULL; | |
2a519311 | 695 | |
9caf0364 | 696 | if (WARN_ON(!tmp->pub.channel)) |
2a519311 | 697 | return NULL; |
2a519311 | 698 | |
9caf0364 | 699 | tmp->ts = jiffies; |
2a519311 | 700 | |
1b8ec87a | 701 | spin_lock_bh(&rdev->bss_lock); |
2a519311 | 702 | |
9caf0364 | 703 | if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) { |
1b8ec87a | 704 | spin_unlock_bh(&rdev->bss_lock); |
9caf0364 JB |
705 | return NULL; |
706 | } | |
707 | ||
1b8ec87a | 708 | found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR); |
2a519311 | 709 | |
cd1658f5 | 710 | if (found) { |
34a6eddb | 711 | /* Update IEs */ |
9caf0364 JB |
712 | if (rcu_access_pointer(tmp->pub.proberesp_ies)) { |
713 | const struct cfg80211_bss_ies *old; | |
714 | ||
715 | old = rcu_access_pointer(found->pub.proberesp_ies); | |
cd1658f5 | 716 | |
9caf0364 JB |
717 | rcu_assign_pointer(found->pub.proberesp_ies, |
718 | tmp->pub.proberesp_ies); | |
34a6eddb | 719 | /* Override possible earlier Beacon frame IEs */ |
9caf0364 JB |
720 | rcu_assign_pointer(found->pub.ies, |
721 | tmp->pub.proberesp_ies); | |
722 | if (old) | |
723 | kfree_rcu((struct cfg80211_bss_ies *)old, | |
724 | rcu_head); | |
725 | } else if (rcu_access_pointer(tmp->pub.beacon_ies)) { | |
9537f227 | 726 | const struct cfg80211_bss_ies *old; |
776b3580 JB |
727 | struct cfg80211_internal_bss *bss; |
728 | ||
729 | if (found->pub.hidden_beacon_bss && | |
730 | !list_empty(&found->hidden_list)) { | |
1345ee6a JB |
731 | const struct cfg80211_bss_ies *f; |
732 | ||
776b3580 JB |
733 | /* |
734 | * The found BSS struct is one of the probe | |
735 | * response members of a group, but we're | |
736 | * receiving a beacon (beacon_ies in the tmp | |
737 | * bss is used). This can only mean that the | |
738 | * AP changed its beacon from not having an | |
739 | * SSID to showing it, which is confusing so | |
740 | * drop this information. | |
741 | */ | |
1345ee6a JB |
742 | |
743 | f = rcu_access_pointer(tmp->pub.beacon_ies); | |
744 | kfree_rcu((struct cfg80211_bss_ies *)f, | |
745 | rcu_head); | |
776b3580 JB |
746 | goto drop; |
747 | } | |
915de2ff | 748 | |
9caf0364 | 749 | old = rcu_access_pointer(found->pub.beacon_ies); |
9caf0364 JB |
750 | |
751 | rcu_assign_pointer(found->pub.beacon_ies, | |
752 | tmp->pub.beacon_ies); | |
01123e23 SN |
753 | |
754 | /* Override IEs if they were from a beacon before */ | |
9537f227 | 755 | if (old == rcu_access_pointer(found->pub.ies)) |
9caf0364 JB |
756 | rcu_assign_pointer(found->pub.ies, |
757 | tmp->pub.beacon_ies); | |
cd1658f5 | 758 | |
776b3580 JB |
759 | /* Assign beacon IEs to all sub entries */ |
760 | list_for_each_entry(bss, &found->hidden_list, | |
761 | hidden_list) { | |
762 | const struct cfg80211_bss_ies *ies; | |
763 | ||
764 | ies = rcu_access_pointer(bss->pub.beacon_ies); | |
765 | WARN_ON(ies != old); | |
766 | ||
767 | rcu_assign_pointer(bss->pub.beacon_ies, | |
768 | tmp->pub.beacon_ies); | |
769 | } | |
770 | ||
9caf0364 JB |
771 | if (old) |
772 | kfree_rcu((struct cfg80211_bss_ies *)old, | |
773 | rcu_head); | |
774 | } | |
1345ee6a JB |
775 | |
776 | found->pub.beacon_interval = tmp->pub.beacon_interval; | |
3afc2167 EG |
777 | /* |
778 | * don't update the signal if beacon was heard on | |
779 | * adjacent channel. | |
780 | */ | |
781 | if (signal_valid) | |
782 | found->pub.signal = tmp->pub.signal; | |
1345ee6a JB |
783 | found->pub.capability = tmp->pub.capability; |
784 | found->ts = tmp->ts; | |
2a519311 | 785 | } else { |
9caf0364 | 786 | struct cfg80211_internal_bss *new; |
dd9dfb9f | 787 | struct cfg80211_internal_bss *hidden; |
9caf0364 | 788 | struct cfg80211_bss_ies *ies; |
dd9dfb9f | 789 | |
9caf0364 JB |
790 | /* |
791 | * create a copy -- the "res" variable that is passed in | |
792 | * is allocated on the stack since it's not needed in the | |
793 | * more common case of an update | |
794 | */ | |
1b8ec87a | 795 | new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size, |
9caf0364 JB |
796 | GFP_ATOMIC); |
797 | if (!new) { | |
798 | ies = (void *)rcu_dereference(tmp->pub.beacon_ies); | |
799 | if (ies) | |
800 | kfree_rcu(ies, rcu_head); | |
801 | ies = (void *)rcu_dereference(tmp->pub.proberesp_ies); | |
802 | if (ies) | |
803 | kfree_rcu(ies, rcu_head); | |
776b3580 | 804 | goto drop; |
9caf0364 JB |
805 | } |
806 | memcpy(new, tmp, sizeof(*new)); | |
776b3580 JB |
807 | new->refcount = 1; |
808 | INIT_LIST_HEAD(&new->hidden_list); | |
809 | ||
810 | if (rcu_access_pointer(tmp->pub.proberesp_ies)) { | |
1b8ec87a | 811 | hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN); |
776b3580 | 812 | if (!hidden) |
1b8ec87a | 813 | hidden = rb_find_bss(rdev, tmp, |
776b3580 JB |
814 | BSS_CMP_HIDE_NUL); |
815 | if (hidden) { | |
816 | new->pub.hidden_beacon_bss = &hidden->pub; | |
817 | list_add(&new->hidden_list, | |
818 | &hidden->hidden_list); | |
819 | hidden->refcount++; | |
820 | rcu_assign_pointer(new->pub.beacon_ies, | |
821 | hidden->pub.beacon_ies); | |
822 | } | |
823 | } else { | |
824 | /* | |
825 | * Ok so we found a beacon, and don't have an entry. If | |
826 | * it's a beacon with hidden SSID, we might be in for an | |
827 | * expensive search for any probe responses that should | |
828 | * be grouped with this beacon for updates ... | |
829 | */ | |
1b8ec87a | 830 | if (!cfg80211_combine_bsses(rdev, new)) { |
776b3580 JB |
831 | kfree(new); |
832 | goto drop; | |
833 | } | |
834 | } | |
835 | ||
1b8ec87a ZG |
836 | list_add_tail(&new->list, &rdev->bss_list); |
837 | rb_insert_bss(rdev, new); | |
9caf0364 | 838 | found = new; |
2a519311 JB |
839 | } |
840 | ||
1b8ec87a ZG |
841 | rdev->bss_generation++; |
842 | bss_ref_get(rdev, found); | |
843 | spin_unlock_bh(&rdev->bss_lock); | |
2a519311 | 844 | |
2a519311 | 845 | return found; |
776b3580 | 846 | drop: |
1b8ec87a | 847 | spin_unlock_bh(&rdev->bss_lock); |
776b3580 | 848 | return NULL; |
2a519311 JB |
849 | } |
850 | ||
0172bb75 JB |
851 | static struct ieee80211_channel * |
852 | cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen, | |
853 | struct ieee80211_channel *channel) | |
854 | { | |
855 | const u8 *tmp; | |
856 | u32 freq; | |
857 | int channel_number = -1; | |
858 | ||
859 | tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen); | |
860 | if (tmp && tmp[1] == 1) { | |
861 | channel_number = tmp[2]; | |
862 | } else { | |
863 | tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen); | |
864 | if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) { | |
865 | struct ieee80211_ht_operation *htop = (void *)(tmp + 2); | |
866 | ||
867 | channel_number = htop->primary_chan; | |
868 | } | |
869 | } | |
870 | ||
871 | if (channel_number < 0) | |
872 | return channel; | |
873 | ||
874 | freq = ieee80211_channel_to_frequency(channel_number, channel->band); | |
875 | channel = ieee80211_get_channel(wiphy, freq); | |
876 | if (!channel) | |
877 | return NULL; | |
878 | if (channel->flags & IEEE80211_CHAN_DISABLED) | |
879 | return NULL; | |
880 | return channel; | |
881 | } | |
882 | ||
0e3a39b5 | 883 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
06aa7afa | 884 | struct cfg80211_bss* |
dcd6eac1 | 885 | cfg80211_inform_bss_width(struct wiphy *wiphy, |
3afc2167 | 886 | struct ieee80211_channel *rx_channel, |
dcd6eac1 | 887 | enum nl80211_bss_scan_width scan_width, |
5bc8c1f2 | 888 | enum cfg80211_bss_frame_type ftype, |
dcd6eac1 SW |
889 | const u8 *bssid, u64 tsf, u16 capability, |
890 | u16 beacon_interval, const u8 *ie, size_t ielen, | |
891 | s32 signal, gfp_t gfp) | |
06aa7afa | 892 | { |
9caf0364 | 893 | struct cfg80211_bss_ies *ies; |
3afc2167 | 894 | struct ieee80211_channel *channel; |
9caf0364 | 895 | struct cfg80211_internal_bss tmp = {}, *res; |
67af9811 | 896 | bool signal_valid; |
06aa7afa JK |
897 | |
898 | if (WARN_ON(!wiphy)) | |
899 | return NULL; | |
900 | ||
22fe88d3 | 901 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
06aa7afa JK |
902 | (signal < 0 || signal > 100))) |
903 | return NULL; | |
904 | ||
3afc2167 | 905 | channel = cfg80211_get_bss_channel(wiphy, ie, ielen, rx_channel); |
0172bb75 JB |
906 | if (!channel) |
907 | return NULL; | |
908 | ||
9caf0364 JB |
909 | memcpy(tmp.pub.bssid, bssid, ETH_ALEN); |
910 | tmp.pub.channel = channel; | |
dcd6eac1 | 911 | tmp.pub.scan_width = scan_width; |
9caf0364 | 912 | tmp.pub.signal = signal; |
9caf0364 JB |
913 | tmp.pub.beacon_interval = beacon_interval; |
914 | tmp.pub.capability = capability; | |
34a6eddb | 915 | /* |
5bc8c1f2 | 916 | * If we do not know here whether the IEs are from a Beacon or Probe |
34a6eddb JM |
917 | * Response frame, we need to pick one of the options and only use it |
918 | * with the driver that does not provide the full Beacon/Probe Response | |
919 | * frame. Use Beacon frame pointer to avoid indicating that this should | |
50521aa8 | 920 | * override the IEs pointer should we have received an earlier |
9caf0364 | 921 | * indication of Probe Response data. |
34a6eddb | 922 | */ |
0e227084 | 923 | ies = kzalloc(sizeof(*ies) + ielen, gfp); |
9caf0364 JB |
924 | if (!ies) |
925 | return NULL; | |
926 | ies->len = ielen; | |
8cef2c9d | 927 | ies->tsf = tsf; |
0e227084 | 928 | ies->from_beacon = false; |
9caf0364 | 929 | memcpy(ies->data, ie, ielen); |
06aa7afa | 930 | |
5bc8c1f2 JB |
931 | switch (ftype) { |
932 | case CFG80211_BSS_FTYPE_BEACON: | |
933 | ies->from_beacon = true; | |
934 | /* fall through to assign */ | |
935 | case CFG80211_BSS_FTYPE_UNKNOWN: | |
936 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); | |
937 | break; | |
938 | case CFG80211_BSS_FTYPE_PRESP: | |
939 | rcu_assign_pointer(tmp.pub.proberesp_ies, ies); | |
940 | break; | |
941 | } | |
9caf0364 | 942 | rcu_assign_pointer(tmp.pub.ies, ies); |
06aa7afa | 943 | |
67af9811 EG |
944 | signal_valid = abs(rx_channel->center_freq - channel->center_freq) <= |
945 | wiphy->max_adj_channel_rssi_comp; | |
946 | res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid); | |
06aa7afa JK |
947 | if (!res) |
948 | return NULL; | |
949 | ||
950 | if (res->pub.capability & WLAN_CAPABILITY_ESS) | |
951 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
952 | ||
4ee3e063 | 953 | trace_cfg80211_return_bss(&res->pub); |
06aa7afa JK |
954 | /* cfg80211_bss_update gives us a referenced result */ |
955 | return &res->pub; | |
956 | } | |
dcd6eac1 | 957 | EXPORT_SYMBOL(cfg80211_inform_bss_width); |
06aa7afa | 958 | |
0e3a39b5 | 959 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
2a519311 | 960 | struct cfg80211_bss * |
dcd6eac1 | 961 | cfg80211_inform_bss_width_frame(struct wiphy *wiphy, |
3afc2167 | 962 | struct ieee80211_channel *rx_channel, |
dcd6eac1 SW |
963 | enum nl80211_bss_scan_width scan_width, |
964 | struct ieee80211_mgmt *mgmt, size_t len, | |
965 | s32 signal, gfp_t gfp) | |
2a519311 | 966 | { |
9caf0364 JB |
967 | struct cfg80211_internal_bss tmp = {}, *res; |
968 | struct cfg80211_bss_ies *ies; | |
3afc2167 | 969 | struct ieee80211_channel *channel; |
67af9811 | 970 | bool signal_valid; |
2a519311 JB |
971 | size_t ielen = len - offsetof(struct ieee80211_mgmt, |
972 | u.probe_resp.variable); | |
bef9bacc | 973 | |
0172bb75 JB |
974 | BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) != |
975 | offsetof(struct ieee80211_mgmt, u.beacon.variable)); | |
976 | ||
3afc2167 | 977 | trace_cfg80211_inform_bss_width_frame(wiphy, rx_channel, scan_width, mgmt, |
dcd6eac1 | 978 | len, signal); |
4ee3e063 | 979 | |
bef9bacc MK |
980 | if (WARN_ON(!mgmt)) |
981 | return NULL; | |
982 | ||
983 | if (WARN_ON(!wiphy)) | |
984 | return NULL; | |
2a519311 | 985 | |
22fe88d3 | 986 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
768be59f | 987 | (signal < 0 || signal > 100))) |
2a519311 JB |
988 | return NULL; |
989 | ||
bef9bacc | 990 | if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) |
2a519311 JB |
991 | return NULL; |
992 | ||
0172bb75 | 993 | channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable, |
3afc2167 | 994 | ielen, rx_channel); |
0172bb75 JB |
995 | if (!channel) |
996 | return NULL; | |
997 | ||
0e227084 | 998 | ies = kzalloc(sizeof(*ies) + ielen, gfp); |
9caf0364 | 999 | if (!ies) |
2a519311 | 1000 | return NULL; |
9caf0364 | 1001 | ies->len = ielen; |
8cef2c9d | 1002 | ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); |
0e227084 | 1003 | ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control); |
9caf0364 | 1004 | memcpy(ies->data, mgmt->u.probe_resp.variable, ielen); |
2a519311 | 1005 | |
9caf0364 JB |
1006 | if (ieee80211_is_probe_resp(mgmt->frame_control)) |
1007 | rcu_assign_pointer(tmp.pub.proberesp_ies, ies); | |
1008 | else | |
1009 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); | |
1010 | rcu_assign_pointer(tmp.pub.ies, ies); | |
1011 | ||
1012 | memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN); | |
1013 | tmp.pub.channel = channel; | |
dcd6eac1 | 1014 | tmp.pub.scan_width = scan_width; |
9caf0364 | 1015 | tmp.pub.signal = signal; |
9caf0364 JB |
1016 | tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); |
1017 | tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); | |
1018 | ||
67af9811 EG |
1019 | signal_valid = abs(rx_channel->center_freq - channel->center_freq) <= |
1020 | wiphy->max_adj_channel_rssi_comp; | |
1021 | res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid); | |
2a519311 JB |
1022 | if (!res) |
1023 | return NULL; | |
1024 | ||
e38f8a7a LR |
1025 | if (res->pub.capability & WLAN_CAPABILITY_ESS) |
1026 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
1027 | ||
4ee3e063 | 1028 | trace_cfg80211_return_bss(&res->pub); |
2a519311 JB |
1029 | /* cfg80211_bss_update gives us a referenced result */ |
1030 | return &res->pub; | |
1031 | } | |
dcd6eac1 | 1032 | EXPORT_SYMBOL(cfg80211_inform_bss_width_frame); |
2a519311 | 1033 | |
5b112d3d | 1034 | void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
4c0c0b75 | 1035 | { |
f26cbf40 | 1036 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
4c0c0b75 JB |
1037 | struct cfg80211_internal_bss *bss; |
1038 | ||
1039 | if (!pub) | |
1040 | return; | |
1041 | ||
1042 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
776b3580 | 1043 | |
1b8ec87a ZG |
1044 | spin_lock_bh(&rdev->bss_lock); |
1045 | bss_ref_get(rdev, bss); | |
1046 | spin_unlock_bh(&rdev->bss_lock); | |
4c0c0b75 JB |
1047 | } |
1048 | EXPORT_SYMBOL(cfg80211_ref_bss); | |
1049 | ||
5b112d3d | 1050 | void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
2a519311 | 1051 | { |
f26cbf40 | 1052 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
2a519311 JB |
1053 | struct cfg80211_internal_bss *bss; |
1054 | ||
1055 | if (!pub) | |
1056 | return; | |
1057 | ||
1058 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
776b3580 | 1059 | |
1b8ec87a ZG |
1060 | spin_lock_bh(&rdev->bss_lock); |
1061 | bss_ref_put(rdev, bss); | |
1062 | spin_unlock_bh(&rdev->bss_lock); | |
2a519311 JB |
1063 | } |
1064 | EXPORT_SYMBOL(cfg80211_put_bss); | |
1065 | ||
d491af19 JB |
1066 | void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
1067 | { | |
f26cbf40 | 1068 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
d491af19 JB |
1069 | struct cfg80211_internal_bss *bss; |
1070 | ||
1071 | if (WARN_ON(!pub)) | |
1072 | return; | |
1073 | ||
1074 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
1075 | ||
1b8ec87a | 1076 | spin_lock_bh(&rdev->bss_lock); |
3207390a | 1077 | if (!list_empty(&bss->list)) { |
1b8ec87a ZG |
1078 | if (__cfg80211_unlink_bss(rdev, bss)) |
1079 | rdev->bss_generation++; | |
3207390a | 1080 | } |
1b8ec87a | 1081 | spin_unlock_bh(&rdev->bss_lock); |
d491af19 JB |
1082 | } |
1083 | EXPORT_SYMBOL(cfg80211_unlink_bss); | |
1084 | ||
3d23e349 | 1085 | #ifdef CONFIG_CFG80211_WEXT |
9f419f38 JB |
1086 | static struct cfg80211_registered_device * |
1087 | cfg80211_get_dev_from_ifindex(struct net *net, int ifindex) | |
1088 | { | |
5fe231e8 | 1089 | struct cfg80211_registered_device *rdev; |
9f419f38 JB |
1090 | struct net_device *dev; |
1091 | ||
5fe231e8 JB |
1092 | ASSERT_RTNL(); |
1093 | ||
9f419f38 JB |
1094 | dev = dev_get_by_index(net, ifindex); |
1095 | if (!dev) | |
5fe231e8 JB |
1096 | return ERR_PTR(-ENODEV); |
1097 | if (dev->ieee80211_ptr) | |
f26cbf40 | 1098 | rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy); |
5fe231e8 | 1099 | else |
9f419f38 JB |
1100 | rdev = ERR_PTR(-ENODEV); |
1101 | dev_put(dev); | |
9f419f38 JB |
1102 | return rdev; |
1103 | } | |
1104 | ||
2a519311 JB |
1105 | int cfg80211_wext_siwscan(struct net_device *dev, |
1106 | struct iw_request_info *info, | |
1107 | union iwreq_data *wrqu, char *extra) | |
1108 | { | |
1109 | struct cfg80211_registered_device *rdev; | |
1110 | struct wiphy *wiphy; | |
1111 | struct iw_scan_req *wreq = NULL; | |
65486c8b | 1112 | struct cfg80211_scan_request *creq = NULL; |
2a519311 JB |
1113 | int i, err, n_channels = 0; |
1114 | enum ieee80211_band band; | |
1115 | ||
1116 | if (!netif_running(dev)) | |
1117 | return -ENETDOWN; | |
1118 | ||
b2e3abdc HS |
1119 | if (wrqu->data.length == sizeof(struct iw_scan_req)) |
1120 | wreq = (struct iw_scan_req *)extra; | |
1121 | ||
463d0183 | 1122 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
1123 | |
1124 | if (IS_ERR(rdev)) | |
1125 | return PTR_ERR(rdev); | |
1126 | ||
f9d15d16 | 1127 | if (rdev->scan_req || rdev->scan_msg) { |
2a519311 JB |
1128 | err = -EBUSY; |
1129 | goto out; | |
1130 | } | |
1131 | ||
1132 | wiphy = &rdev->wiphy; | |
1133 | ||
b2e3abdc HS |
1134 | /* Determine number of channels, needed to allocate creq */ |
1135 | if (wreq && wreq->num_channels) | |
1136 | n_channels = wreq->num_channels; | |
bdfbec2d IP |
1137 | else |
1138 | n_channels = ieee80211_get_num_supported_channels(wiphy); | |
2a519311 JB |
1139 | |
1140 | creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + | |
1141 | n_channels * sizeof(void *), | |
1142 | GFP_ATOMIC); | |
1143 | if (!creq) { | |
1144 | err = -ENOMEM; | |
1145 | goto out; | |
1146 | } | |
1147 | ||
1148 | creq->wiphy = wiphy; | |
fd014284 | 1149 | creq->wdev = dev->ieee80211_ptr; |
5ba63533 JB |
1150 | /* SSIDs come after channels */ |
1151 | creq->ssids = (void *)&creq->channels[n_channels]; | |
2a519311 JB |
1152 | creq->n_channels = n_channels; |
1153 | creq->n_ssids = 1; | |
15d6030b | 1154 | creq->scan_start = jiffies; |
2a519311 | 1155 | |
b2e3abdc | 1156 | /* translate "Scan on frequencies" request */ |
2a519311 JB |
1157 | i = 0; |
1158 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
1159 | int j; | |
584991dc | 1160 | |
2a519311 JB |
1161 | if (!wiphy->bands[band]) |
1162 | continue; | |
584991dc | 1163 | |
2a519311 | 1164 | for (j = 0; j < wiphy->bands[band]->n_channels; j++) { |
584991dc JB |
1165 | /* ignore disabled channels */ |
1166 | if (wiphy->bands[band]->channels[j].flags & | |
1167 | IEEE80211_CHAN_DISABLED) | |
1168 | continue; | |
b2e3abdc HS |
1169 | |
1170 | /* If we have a wireless request structure and the | |
1171 | * wireless request specifies frequencies, then search | |
1172 | * for the matching hardware channel. | |
1173 | */ | |
1174 | if (wreq && wreq->num_channels) { | |
1175 | int k; | |
1176 | int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; | |
1177 | for (k = 0; k < wreq->num_channels; k++) { | |
96998e3a ZG |
1178 | struct iw_freq *freq = |
1179 | &wreq->channel_list[k]; | |
1180 | int wext_freq = | |
1181 | cfg80211_wext_freq(freq); | |
1182 | ||
b2e3abdc HS |
1183 | if (wext_freq == wiphy_freq) |
1184 | goto wext_freq_found; | |
1185 | } | |
1186 | goto wext_freq_not_found; | |
1187 | } | |
1188 | ||
1189 | wext_freq_found: | |
2a519311 JB |
1190 | creq->channels[i] = &wiphy->bands[band]->channels[j]; |
1191 | i++; | |
b2e3abdc | 1192 | wext_freq_not_found: ; |
2a519311 JB |
1193 | } |
1194 | } | |
8862dc5f HS |
1195 | /* No channels found? */ |
1196 | if (!i) { | |
1197 | err = -EINVAL; | |
1198 | goto out; | |
1199 | } | |
2a519311 | 1200 | |
b2e3abdc HS |
1201 | /* Set real number of channels specified in creq->channels[] */ |
1202 | creq->n_channels = i; | |
2a519311 | 1203 | |
b2e3abdc HS |
1204 | /* translate "Scan for SSID" request */ |
1205 | if (wreq) { | |
2a519311 | 1206 | if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { |
65486c8b JB |
1207 | if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { |
1208 | err = -EINVAL; | |
1209 | goto out; | |
1210 | } | |
2a519311 JB |
1211 | memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); |
1212 | creq->ssids[0].ssid_len = wreq->essid_len; | |
1213 | } | |
1214 | if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) | |
1215 | creq->n_ssids = 0; | |
1216 | } | |
1217 | ||
34850ab2 | 1218 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) |
a401d2bb JB |
1219 | if (wiphy->bands[i]) |
1220 | creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1; | |
34850ab2 | 1221 | |
2a519311 | 1222 | rdev->scan_req = creq; |
e35e4d28 | 1223 | err = rdev_scan(rdev, creq); |
2a519311 JB |
1224 | if (err) { |
1225 | rdev->scan_req = NULL; | |
65486c8b | 1226 | /* creq will be freed below */ |
463d0183 | 1227 | } else { |
fd014284 | 1228 | nl80211_send_scan_start(rdev, dev->ieee80211_ptr); |
65486c8b JB |
1229 | /* creq now owned by driver */ |
1230 | creq = NULL; | |
463d0183 JB |
1231 | dev_hold(dev); |
1232 | } | |
2a519311 | 1233 | out: |
65486c8b | 1234 | kfree(creq); |
2a519311 JB |
1235 | return err; |
1236 | } | |
ba44cb72 | 1237 | EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan); |
2a519311 JB |
1238 | |
1239 | static void ieee80211_scan_add_ies(struct iw_request_info *info, | |
9caf0364 | 1240 | const struct cfg80211_bss_ies *ies, |
2a519311 JB |
1241 | char **current_ev, char *end_buf) |
1242 | { | |
9caf0364 | 1243 | const u8 *pos, *end, *next; |
2a519311 JB |
1244 | struct iw_event iwe; |
1245 | ||
9caf0364 | 1246 | if (!ies) |
2a519311 JB |
1247 | return; |
1248 | ||
1249 | /* | |
1250 | * If needed, fragment the IEs buffer (at IE boundaries) into short | |
1251 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. | |
1252 | */ | |
9caf0364 JB |
1253 | pos = ies->data; |
1254 | end = pos + ies->len; | |
2a519311 JB |
1255 | |
1256 | while (end - pos > IW_GENERIC_IE_MAX) { | |
1257 | next = pos + 2 + pos[1]; | |
1258 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) | |
1259 | next = next + 2 + next[1]; | |
1260 | ||
1261 | memset(&iwe, 0, sizeof(iwe)); | |
1262 | iwe.cmd = IWEVGENIE; | |
1263 | iwe.u.data.length = next - pos; | |
1264 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
9caf0364 JB |
1265 | end_buf, &iwe, |
1266 | (void *)pos); | |
2a519311 JB |
1267 | |
1268 | pos = next; | |
1269 | } | |
1270 | ||
1271 | if (end > pos) { | |
1272 | memset(&iwe, 0, sizeof(iwe)); | |
1273 | iwe.cmd = IWEVGENIE; | |
1274 | iwe.u.data.length = end - pos; | |
1275 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
9caf0364 JB |
1276 | end_buf, &iwe, |
1277 | (void *)pos); | |
2a519311 JB |
1278 | } |
1279 | } | |
1280 | ||
2a519311 | 1281 | static char * |
77965c97 JB |
1282 | ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, |
1283 | struct cfg80211_internal_bss *bss, char *current_ev, | |
1284 | char *end_buf) | |
2a519311 | 1285 | { |
9caf0364 | 1286 | const struct cfg80211_bss_ies *ies; |
2a519311 | 1287 | struct iw_event iwe; |
9caf0364 | 1288 | const u8 *ie; |
2a519311 | 1289 | u8 *buf, *cfg, *p; |
9caf0364 | 1290 | int rem, i, sig; |
2a519311 JB |
1291 | bool ismesh = false; |
1292 | ||
1293 | memset(&iwe, 0, sizeof(iwe)); | |
1294 | iwe.cmd = SIOCGIWAP; | |
1295 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; | |
1296 | memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); | |
1297 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
1298 | IW_EV_ADDR_LEN); | |
1299 | ||
1300 | memset(&iwe, 0, sizeof(iwe)); | |
1301 | iwe.cmd = SIOCGIWFREQ; | |
1302 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); | |
1303 | iwe.u.freq.e = 0; | |
1304 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
1305 | IW_EV_FREQ_LEN); | |
1306 | ||
1307 | memset(&iwe, 0, sizeof(iwe)); | |
1308 | iwe.cmd = SIOCGIWFREQ; | |
1309 | iwe.u.freq.m = bss->pub.channel->center_freq; | |
1310 | iwe.u.freq.e = 6; | |
1311 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
1312 | IW_EV_FREQ_LEN); | |
1313 | ||
77965c97 | 1314 | if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { |
2a519311 JB |
1315 | memset(&iwe, 0, sizeof(iwe)); |
1316 | iwe.cmd = IWEVQUAL; | |
1317 | iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | | |
1318 | IW_QUAL_NOISE_INVALID | | |
a77b8552 | 1319 | IW_QUAL_QUAL_UPDATED; |
77965c97 | 1320 | switch (wiphy->signal_type) { |
2a519311 | 1321 | case CFG80211_SIGNAL_TYPE_MBM: |
a77b8552 JB |
1322 | sig = bss->pub.signal / 100; |
1323 | iwe.u.qual.level = sig; | |
2a519311 | 1324 | iwe.u.qual.updated |= IW_QUAL_DBM; |
a77b8552 JB |
1325 | if (sig < -110) /* rather bad */ |
1326 | sig = -110; | |
1327 | else if (sig > -40) /* perfect */ | |
1328 | sig = -40; | |
1329 | /* will give a range of 0 .. 70 */ | |
1330 | iwe.u.qual.qual = sig + 110; | |
2a519311 JB |
1331 | break; |
1332 | case CFG80211_SIGNAL_TYPE_UNSPEC: | |
1333 | iwe.u.qual.level = bss->pub.signal; | |
a77b8552 JB |
1334 | /* will give range 0 .. 100 */ |
1335 | iwe.u.qual.qual = bss->pub.signal; | |
2a519311 JB |
1336 | break; |
1337 | default: | |
1338 | /* not reached */ | |
1339 | break; | |
1340 | } | |
1341 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
1342 | &iwe, IW_EV_QUAL_LEN); | |
1343 | } | |
1344 | ||
1345 | memset(&iwe, 0, sizeof(iwe)); | |
1346 | iwe.cmd = SIOCGIWENCODE; | |
1347 | if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) | |
1348 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; | |
1349 | else | |
1350 | iwe.u.data.flags = IW_ENCODE_DISABLED; | |
1351 | iwe.u.data.length = 0; | |
1352 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
1353 | &iwe, ""); | |
1354 | ||
9caf0364 JB |
1355 | rcu_read_lock(); |
1356 | ies = rcu_dereference(bss->pub.ies); | |
83c7aa1a JB |
1357 | rem = ies->len; |
1358 | ie = ies->data; | |
9caf0364 | 1359 | |
83c7aa1a | 1360 | while (rem >= 2) { |
2a519311 JB |
1361 | /* invalid data */ |
1362 | if (ie[1] > rem - 2) | |
1363 | break; | |
1364 | ||
1365 | switch (ie[0]) { | |
1366 | case WLAN_EID_SSID: | |
1367 | memset(&iwe, 0, sizeof(iwe)); | |
1368 | iwe.cmd = SIOCGIWESSID; | |
1369 | iwe.u.data.length = ie[1]; | |
1370 | iwe.u.data.flags = 1; | |
1371 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
9caf0364 | 1372 | &iwe, (u8 *)ie + 2); |
2a519311 JB |
1373 | break; |
1374 | case WLAN_EID_MESH_ID: | |
1375 | memset(&iwe, 0, sizeof(iwe)); | |
1376 | iwe.cmd = SIOCGIWESSID; | |
1377 | iwe.u.data.length = ie[1]; | |
1378 | iwe.u.data.flags = 1; | |
1379 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
9caf0364 | 1380 | &iwe, (u8 *)ie + 2); |
2a519311 JB |
1381 | break; |
1382 | case WLAN_EID_MESH_CONFIG: | |
1383 | ismesh = true; | |
136cfa28 | 1384 | if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) |
2a519311 JB |
1385 | break; |
1386 | buf = kmalloc(50, GFP_ATOMIC); | |
1387 | if (!buf) | |
1388 | break; | |
9caf0364 | 1389 | cfg = (u8 *)ie + 2; |
2a519311 JB |
1390 | memset(&iwe, 0, sizeof(iwe)); |
1391 | iwe.cmd = IWEVCUSTOM; | |
76aa5e70 RP |
1392 | sprintf(buf, "Mesh Network Path Selection Protocol ID: " |
1393 | "0x%02X", cfg[0]); | |
2a519311 JB |
1394 | iwe.u.data.length = strlen(buf); |
1395 | current_ev = iwe_stream_add_point(info, current_ev, | |
1396 | end_buf, | |
1397 | &iwe, buf); | |
76aa5e70 RP |
1398 | sprintf(buf, "Path Selection Metric ID: 0x%02X", |
1399 | cfg[1]); | |
2a519311 JB |
1400 | iwe.u.data.length = strlen(buf); |
1401 | current_ev = iwe_stream_add_point(info, current_ev, | |
1402 | end_buf, | |
1403 | &iwe, buf); | |
76aa5e70 RP |
1404 | sprintf(buf, "Congestion Control Mode ID: 0x%02X", |
1405 | cfg[2]); | |
2a519311 JB |
1406 | iwe.u.data.length = strlen(buf); |
1407 | current_ev = iwe_stream_add_point(info, current_ev, | |
1408 | end_buf, | |
1409 | &iwe, buf); | |
76aa5e70 | 1410 | sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]); |
2a519311 JB |
1411 | iwe.u.data.length = strlen(buf); |
1412 | current_ev = iwe_stream_add_point(info, current_ev, | |
1413 | end_buf, | |
1414 | &iwe, buf); | |
76aa5e70 RP |
1415 | sprintf(buf, "Authentication ID: 0x%02X", cfg[4]); |
1416 | iwe.u.data.length = strlen(buf); | |
1417 | current_ev = iwe_stream_add_point(info, current_ev, | |
1418 | end_buf, | |
1419 | &iwe, buf); | |
1420 | sprintf(buf, "Formation Info: 0x%02X", cfg[5]); | |
1421 | iwe.u.data.length = strlen(buf); | |
1422 | current_ev = iwe_stream_add_point(info, current_ev, | |
1423 | end_buf, | |
1424 | &iwe, buf); | |
1425 | sprintf(buf, "Capabilities: 0x%02X", cfg[6]); | |
2a519311 JB |
1426 | iwe.u.data.length = strlen(buf); |
1427 | current_ev = iwe_stream_add_point(info, current_ev, | |
1428 | end_buf, | |
1429 | &iwe, buf); | |
1430 | kfree(buf); | |
1431 | break; | |
1432 | case WLAN_EID_SUPP_RATES: | |
1433 | case WLAN_EID_EXT_SUPP_RATES: | |
1434 | /* display all supported rates in readable format */ | |
1435 | p = current_ev + iwe_stream_lcp_len(info); | |
1436 | ||
1437 | memset(&iwe, 0, sizeof(iwe)); | |
1438 | iwe.cmd = SIOCGIWRATE; | |
1439 | /* Those two flags are ignored... */ | |
1440 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; | |
1441 | ||
1442 | for (i = 0; i < ie[1]; i++) { | |
1443 | iwe.u.bitrate.value = | |
1444 | ((ie[i + 2] & 0x7f) * 500000); | |
1445 | p = iwe_stream_add_value(info, current_ev, p, | |
1446 | end_buf, &iwe, IW_EV_PARAM_LEN); | |
1447 | } | |
1448 | current_ev = p; | |
1449 | break; | |
1450 | } | |
1451 | rem -= ie[1] + 2; | |
1452 | ie += ie[1] + 2; | |
1453 | } | |
1454 | ||
f64f9e71 JP |
1455 | if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || |
1456 | ismesh) { | |
2a519311 JB |
1457 | memset(&iwe, 0, sizeof(iwe)); |
1458 | iwe.cmd = SIOCGIWMODE; | |
1459 | if (ismesh) | |
1460 | iwe.u.mode = IW_MODE_MESH; | |
1461 | else if (bss->pub.capability & WLAN_CAPABILITY_ESS) | |
1462 | iwe.u.mode = IW_MODE_MASTER; | |
1463 | else | |
1464 | iwe.u.mode = IW_MODE_ADHOC; | |
1465 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
1466 | &iwe, IW_EV_UINT_LEN); | |
1467 | } | |
1468 | ||
c49dc900 | 1469 | buf = kmalloc(31, GFP_ATOMIC); |
2a519311 JB |
1470 | if (buf) { |
1471 | memset(&iwe, 0, sizeof(iwe)); | |
1472 | iwe.cmd = IWEVCUSTOM; | |
8cef2c9d | 1473 | sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf)); |
2a519311 JB |
1474 | iwe.u.data.length = strlen(buf); |
1475 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
1476 | &iwe, buf); | |
1477 | memset(&iwe, 0, sizeof(iwe)); | |
1478 | iwe.cmd = IWEVCUSTOM; | |
cb3a8eec DW |
1479 | sprintf(buf, " Last beacon: %ums ago", |
1480 | elapsed_jiffies_msecs(bss->ts)); | |
2a519311 JB |
1481 | iwe.u.data.length = strlen(buf); |
1482 | current_ev = iwe_stream_add_point(info, current_ev, | |
1483 | end_buf, &iwe, buf); | |
1484 | kfree(buf); | |
1485 | } | |
1486 | ||
9caf0364 JB |
1487 | ieee80211_scan_add_ies(info, ies, ¤t_ev, end_buf); |
1488 | rcu_read_unlock(); | |
2a519311 JB |
1489 | |
1490 | return current_ev; | |
1491 | } | |
1492 | ||
1493 | ||
1b8ec87a | 1494 | static int ieee80211_scan_results(struct cfg80211_registered_device *rdev, |
2a519311 JB |
1495 | struct iw_request_info *info, |
1496 | char *buf, size_t len) | |
1497 | { | |
1498 | char *current_ev = buf; | |
1499 | char *end_buf = buf + len; | |
1500 | struct cfg80211_internal_bss *bss; | |
1501 | ||
1b8ec87a ZG |
1502 | spin_lock_bh(&rdev->bss_lock); |
1503 | cfg80211_bss_expire(rdev); | |
2a519311 | 1504 | |
1b8ec87a | 1505 | list_for_each_entry(bss, &rdev->bss_list, list) { |
2a519311 | 1506 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { |
1b8ec87a | 1507 | spin_unlock_bh(&rdev->bss_lock); |
2a519311 JB |
1508 | return -E2BIG; |
1509 | } | |
1b8ec87a | 1510 | current_ev = ieee80211_bss(&rdev->wiphy, info, bss, |
77965c97 | 1511 | current_ev, end_buf); |
2a519311 | 1512 | } |
1b8ec87a | 1513 | spin_unlock_bh(&rdev->bss_lock); |
2a519311 JB |
1514 | return current_ev - buf; |
1515 | } | |
1516 | ||
1517 | ||
1518 | int cfg80211_wext_giwscan(struct net_device *dev, | |
1519 | struct iw_request_info *info, | |
1520 | struct iw_point *data, char *extra) | |
1521 | { | |
1522 | struct cfg80211_registered_device *rdev; | |
1523 | int res; | |
1524 | ||
1525 | if (!netif_running(dev)) | |
1526 | return -ENETDOWN; | |
1527 | ||
463d0183 | 1528 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
1529 | |
1530 | if (IS_ERR(rdev)) | |
1531 | return PTR_ERR(rdev); | |
1532 | ||
f9d15d16 | 1533 | if (rdev->scan_req || rdev->scan_msg) |
5fe231e8 | 1534 | return -EAGAIN; |
2a519311 JB |
1535 | |
1536 | res = ieee80211_scan_results(rdev, info, extra, data->length); | |
1537 | data->length = 0; | |
1538 | if (res >= 0) { | |
1539 | data->length = res; | |
1540 | res = 0; | |
1541 | } | |
1542 | ||
2a519311 JB |
1543 | return res; |
1544 | } | |
ba44cb72 | 1545 | EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan); |
2a519311 | 1546 | #endif |