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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
2a519311 JB |
2 | /* |
3 | * cfg80211 scan result handling | |
4 | * | |
5 | * Copyright 2008 Johannes Berg <johannes@sipsolutions.net> | |
2740f0cf | 6 | * Copyright 2013-2014 Intel Mobile Communications GmbH |
1d76250b | 7 | * Copyright 2016 Intel Deutschland GmbH |
c8cb5b85 | 8 | * Copyright (C) 2018-2020 Intel Corporation |
2a519311 JB |
9 | */ |
10 | #include <linux/kernel.h> | |
5a0e3ad6 | 11 | #include <linux/slab.h> |
2a519311 JB |
12 | #include <linux/module.h> |
13 | #include <linux/netdevice.h> | |
14 | #include <linux/wireless.h> | |
15 | #include <linux/nl80211.h> | |
16 | #include <linux/etherdevice.h> | |
c8cb5b85 TM |
17 | #include <linux/crc32.h> |
18 | #include <linux/bitfield.h> | |
2a519311 JB |
19 | #include <net/arp.h> |
20 | #include <net/cfg80211.h> | |
262eb9b2 | 21 | #include <net/cfg80211-wext.h> |
2a519311 JB |
22 | #include <net/iw_handler.h> |
23 | #include "core.h" | |
24 | #include "nl80211.h" | |
a9a11622 | 25 | #include "wext-compat.h" |
e35e4d28 | 26 | #include "rdev-ops.h" |
2a519311 | 27 | |
776b3580 JB |
28 | /** |
29 | * DOC: BSS tree/list structure | |
30 | * | |
31 | * At the top level, the BSS list is kept in both a list in each | |
32 | * registered device (@bss_list) as well as an RB-tree for faster | |
33 | * lookup. In the RB-tree, entries can be looked up using their | |
34 | * channel, MESHID, MESHCONF (for MBSSes) or channel, BSSID, SSID | |
35 | * for other BSSes. | |
36 | * | |
37 | * Due to the possibility of hidden SSIDs, there's a second level | |
38 | * structure, the "hidden_list" and "hidden_beacon_bss" pointer. | |
39 | * The hidden_list connects all BSSes belonging to a single AP | |
40 | * that has a hidden SSID, and connects beacon and probe response | |
41 | * entries. For a probe response entry for a hidden SSID, the | |
42 | * hidden_beacon_bss pointer points to the BSS struct holding the | |
43 | * beacon's information. | |
44 | * | |
45 | * Reference counting is done for all these references except for | |
46 | * the hidden_list, so that a beacon BSS struct that is otherwise | |
47 | * not referenced has one reference for being on the bss_list and | |
48 | * one for each probe response entry that points to it using the | |
49 | * hidden_beacon_bss pointer. When a BSS struct that has such a | |
50 | * pointer is get/put, the refcount update is also propagated to | |
51 | * the referenced struct, this ensure that it cannot get removed | |
52 | * while somebody is using the probe response version. | |
53 | * | |
54 | * Note that the hidden_beacon_bss pointer never changes, due to | |
55 | * the reference counting. Therefore, no locking is needed for | |
56 | * it. | |
57 | * | |
58 | * Also note that the hidden_beacon_bss pointer is only relevant | |
59 | * if the driver uses something other than the IEs, e.g. private | |
8cf5c86d | 60 | * data stored in the BSS struct, since the beacon IEs are |
776b3580 JB |
61 | * also linked into the probe response struct. |
62 | */ | |
63 | ||
9853a55e JB |
64 | /* |
65 | * Limit the number of BSS entries stored in mac80211. Each one is | |
66 | * a bit over 4k at most, so this limits to roughly 4-5M of memory. | |
67 | * If somebody wants to really attack this though, they'd likely | |
68 | * use small beacons, and only one type of frame, limiting each of | |
69 | * the entries to a much smaller size (in order to generate more | |
70 | * entries in total, so overhead is bigger.) | |
71 | */ | |
72 | static int bss_entries_limit = 1000; | |
73 | module_param(bss_entries_limit, int, 0644); | |
74 | MODULE_PARM_DESC(bss_entries_limit, | |
75 | "limit to number of scan BSS entries (per wiphy, default 1000)"); | |
76 | ||
f9616e0f | 77 | #define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ) |
2a519311 | 78 | |
c8cb5b85 TM |
79 | /** |
80 | * struct cfg80211_colocated_ap - colocated AP information | |
81 | * | |
82 | * @list: linked list to all colocated aPS | |
83 | * @bssid: BSSID of the reported AP | |
84 | * @ssid: SSID of the reported AP | |
85 | * @ssid_len: length of the ssid | |
86 | * @center_freq: frequency the reported AP is on | |
87 | * @unsolicited_probe: the reported AP is part of an ESS, where all the APs | |
88 | * that operate in the same channel as the reported AP and that might be | |
89 | * detected by a STA receiving this frame, are transmitting unsolicited | |
90 | * Probe Response frames every 20 TUs | |
91 | * @oct_recommended: OCT is recommended to exchange MMPDUs with the reported AP | |
92 | * @same_ssid: the reported AP has the same SSID as the reporting AP | |
93 | * @multi_bss: the reported AP is part of a multiple BSSID set | |
94 | * @transmitted_bssid: the reported AP is the transmitting BSSID | |
95 | * @colocated_ess: all the APs that share the same ESS as the reported AP are | |
96 | * colocated and can be discovered via legacy bands. | |
97 | * @short_ssid_valid: short_ssid is valid and can be used | |
98 | * @short_ssid: the short SSID for this SSID | |
99 | */ | |
100 | struct cfg80211_colocated_ap { | |
101 | struct list_head list; | |
102 | u8 bssid[ETH_ALEN]; | |
103 | u8 ssid[IEEE80211_MAX_SSID_LEN]; | |
104 | size_t ssid_len; | |
105 | u32 short_ssid; | |
106 | u32 center_freq; | |
107 | u8 unsolicited_probe:1, | |
108 | oct_recommended:1, | |
109 | same_ssid:1, | |
110 | multi_bss:1, | |
111 | transmitted_bssid:1, | |
112 | colocated_ess:1, | |
113 | short_ssid_valid:1; | |
114 | }; | |
115 | ||
776b3580 | 116 | static void bss_free(struct cfg80211_internal_bss *bss) |
e8e27c66 | 117 | { |
9caf0364 | 118 | struct cfg80211_bss_ies *ies; |
b629ea3d JB |
119 | |
120 | if (WARN_ON(atomic_read(&bss->hold))) | |
121 | return; | |
122 | ||
9caf0364 | 123 | ies = (void *)rcu_access_pointer(bss->pub.beacon_ies); |
776b3580 | 124 | if (ies && !bss->pub.hidden_beacon_bss) |
9caf0364 JB |
125 | kfree_rcu(ies, rcu_head); |
126 | ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies); | |
127 | if (ies) | |
128 | kfree_rcu(ies, rcu_head); | |
e8e27c66 | 129 | |
776b3580 JB |
130 | /* |
131 | * This happens when the module is removed, it doesn't | |
132 | * really matter any more save for completeness | |
133 | */ | |
134 | if (!list_empty(&bss->hidden_list)) | |
135 | list_del(&bss->hidden_list); | |
136 | ||
e8e27c66 AK |
137 | kfree(bss); |
138 | } | |
139 | ||
1b8ec87a | 140 | static inline void bss_ref_get(struct cfg80211_registered_device *rdev, |
776b3580 | 141 | struct cfg80211_internal_bss *bss) |
0532d4f1 | 142 | { |
1b8ec87a | 143 | lockdep_assert_held(&rdev->bss_lock); |
776b3580 JB |
144 | |
145 | bss->refcount++; | |
146 | if (bss->pub.hidden_beacon_bss) { | |
147 | bss = container_of(bss->pub.hidden_beacon_bss, | |
148 | struct cfg80211_internal_bss, | |
149 | pub); | |
150 | bss->refcount++; | |
151 | } | |
7011ba58 SS |
152 | if (bss->pub.transmitted_bss) { |
153 | bss = container_of(bss->pub.transmitted_bss, | |
a3584f56 SS |
154 | struct cfg80211_internal_bss, |
155 | pub); | |
156 | bss->refcount++; | |
157 | } | |
0532d4f1 JB |
158 | } |
159 | ||
1b8ec87a | 160 | static inline void bss_ref_put(struct cfg80211_registered_device *rdev, |
776b3580 | 161 | struct cfg80211_internal_bss *bss) |
0532d4f1 | 162 | { |
1b8ec87a | 163 | lockdep_assert_held(&rdev->bss_lock); |
776b3580 JB |
164 | |
165 | if (bss->pub.hidden_beacon_bss) { | |
166 | struct cfg80211_internal_bss *hbss; | |
167 | hbss = container_of(bss->pub.hidden_beacon_bss, | |
168 | struct cfg80211_internal_bss, | |
169 | pub); | |
170 | hbss->refcount--; | |
171 | if (hbss->refcount == 0) | |
172 | bss_free(hbss); | |
173 | } | |
a3584f56 | 174 | |
7011ba58 | 175 | if (bss->pub.transmitted_bss) { |
a3584f56 SS |
176 | struct cfg80211_internal_bss *tbss; |
177 | ||
7011ba58 | 178 | tbss = container_of(bss->pub.transmitted_bss, |
a3584f56 SS |
179 | struct cfg80211_internal_bss, |
180 | pub); | |
181 | tbss->refcount--; | |
182 | if (tbss->refcount == 0) | |
183 | bss_free(tbss); | |
184 | } | |
185 | ||
776b3580 JB |
186 | bss->refcount--; |
187 | if (bss->refcount == 0) | |
188 | bss_free(bss); | |
0532d4f1 JB |
189 | } |
190 | ||
1b8ec87a | 191 | static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev, |
e8e27c66 AK |
192 | struct cfg80211_internal_bss *bss) |
193 | { | |
1b8ec87a | 194 | lockdep_assert_held(&rdev->bss_lock); |
4b1af479 | 195 | |
776b3580 JB |
196 | if (!list_empty(&bss->hidden_list)) { |
197 | /* | |
198 | * don't remove the beacon entry if it has | |
199 | * probe responses associated with it | |
200 | */ | |
201 | if (!bss->pub.hidden_beacon_bss) | |
202 | return false; | |
203 | /* | |
204 | * if it's a probe response entry break its | |
205 | * link to the other entries in the group | |
206 | */ | |
207 | list_del_init(&bss->hidden_list); | |
208 | } | |
209 | ||
e8e27c66 | 210 | list_del_init(&bss->list); |
7011ba58 | 211 | list_del_init(&bss->pub.nontrans_list); |
1b8ec87a | 212 | rb_erase(&bss->rbn, &rdev->bss_tree); |
9853a55e JB |
213 | rdev->bss_entries--; |
214 | WARN_ONCE((rdev->bss_entries == 0) ^ list_empty(&rdev->bss_list), | |
215 | "rdev bss entries[%d]/list[empty:%d] corruption\n", | |
216 | rdev->bss_entries, list_empty(&rdev->bss_list)); | |
1b8ec87a | 217 | bss_ref_put(rdev, bss); |
776b3580 | 218 | return true; |
e8e27c66 AK |
219 | } |
220 | ||
f7dacfb1 SS |
221 | bool cfg80211_is_element_inherited(const struct element *elem, |
222 | const struct element *non_inherit_elem) | |
223 | { | |
224 | u8 id_len, ext_id_len, i, loop_len, id; | |
225 | const u8 *list; | |
226 | ||
227 | if (elem->id == WLAN_EID_MULTIPLE_BSSID) | |
228 | return false; | |
229 | ||
230 | if (!non_inherit_elem || non_inherit_elem->datalen < 2) | |
231 | return true; | |
232 | ||
233 | /* | |
234 | * non inheritance element format is: | |
235 | * ext ID (56) | IDs list len | list | extension IDs list len | list | |
236 | * Both lists are optional. Both lengths are mandatory. | |
237 | * This means valid length is: | |
238 | * elem_len = 1 (extension ID) + 2 (list len fields) + list lengths | |
239 | */ | |
240 | id_len = non_inherit_elem->data[1]; | |
241 | if (non_inherit_elem->datalen < 3 + id_len) | |
242 | return true; | |
243 | ||
244 | ext_id_len = non_inherit_elem->data[2 + id_len]; | |
245 | if (non_inherit_elem->datalen < 3 + id_len + ext_id_len) | |
246 | return true; | |
247 | ||
248 | if (elem->id == WLAN_EID_EXTENSION) { | |
249 | if (!ext_id_len) | |
250 | return true; | |
251 | loop_len = ext_id_len; | |
252 | list = &non_inherit_elem->data[3 + id_len]; | |
253 | id = elem->data[0]; | |
254 | } else { | |
255 | if (!id_len) | |
256 | return true; | |
257 | loop_len = id_len; | |
258 | list = &non_inherit_elem->data[2]; | |
259 | id = elem->id; | |
260 | } | |
261 | ||
262 | for (i = 0; i < loop_len; i++) { | |
263 | if (list[i] == id) | |
264 | return false; | |
265 | } | |
266 | ||
267 | return true; | |
268 | } | |
269 | EXPORT_SYMBOL(cfg80211_is_element_inherited); | |
270 | ||
0b8fb823 PX |
271 | static size_t cfg80211_gen_new_ie(const u8 *ie, size_t ielen, |
272 | const u8 *subelement, size_t subie_len, | |
273 | u8 *new_ie, gfp_t gfp) | |
274 | { | |
275 | u8 *pos, *tmp; | |
276 | const u8 *tmp_old, *tmp_new; | |
f7dacfb1 | 277 | const struct element *non_inherit_elem; |
0b8fb823 PX |
278 | u8 *sub_copy; |
279 | ||
280 | /* copy subelement as we need to change its content to | |
281 | * mark an ie after it is processed. | |
282 | */ | |
90abf96a | 283 | sub_copy = kmemdup(subelement, subie_len, gfp); |
0b8fb823 PX |
284 | if (!sub_copy) |
285 | return 0; | |
0b8fb823 PX |
286 | |
287 | pos = &new_ie[0]; | |
288 | ||
289 | /* set new ssid */ | |
290 | tmp_new = cfg80211_find_ie(WLAN_EID_SSID, sub_copy, subie_len); | |
291 | if (tmp_new) { | |
292 | memcpy(pos, tmp_new, tmp_new[1] + 2); | |
293 | pos += (tmp_new[1] + 2); | |
294 | } | |
295 | ||
f7dacfb1 SS |
296 | /* get non inheritance list if exists */ |
297 | non_inherit_elem = | |
298 | cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE, | |
299 | sub_copy, subie_len); | |
300 | ||
0b8fb823 PX |
301 | /* go through IEs in ie (skip SSID) and subelement, |
302 | * merge them into new_ie | |
303 | */ | |
304 | tmp_old = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen); | |
305 | tmp_old = (tmp_old) ? tmp_old + tmp_old[1] + 2 : ie; | |
306 | ||
307 | while (tmp_old + tmp_old[1] + 2 - ie <= ielen) { | |
308 | if (tmp_old[0] == 0) { | |
309 | tmp_old++; | |
310 | continue; | |
311 | } | |
312 | ||
c17fe043 SS |
313 | if (tmp_old[0] == WLAN_EID_EXTENSION) |
314 | tmp = (u8 *)cfg80211_find_ext_ie(tmp_old[2], sub_copy, | |
315 | subie_len); | |
316 | else | |
317 | tmp = (u8 *)cfg80211_find_ie(tmp_old[0], sub_copy, | |
318 | subie_len); | |
319 | ||
0b8fb823 | 320 | if (!tmp) { |
f7dacfb1 SS |
321 | const struct element *old_elem = (void *)tmp_old; |
322 | ||
0b8fb823 | 323 | /* ie in old ie but not in subelement */ |
f7dacfb1 SS |
324 | if (cfg80211_is_element_inherited(old_elem, |
325 | non_inherit_elem)) { | |
0b8fb823 PX |
326 | memcpy(pos, tmp_old, tmp_old[1] + 2); |
327 | pos += tmp_old[1] + 2; | |
328 | } | |
329 | } else { | |
330 | /* ie in transmitting ie also in subelement, | |
331 | * copy from subelement and flag the ie in subelement | |
c17fe043 SS |
332 | * as copied (by setting eid field to WLAN_EID_SSID, |
333 | * which is skipped anyway). | |
334 | * For vendor ie, compare OUI + type + subType to | |
0b8fb823 PX |
335 | * determine if they are the same ie. |
336 | */ | |
337 | if (tmp_old[0] == WLAN_EID_VENDOR_SPECIFIC) { | |
338 | if (!memcmp(tmp_old + 2, tmp + 2, 5)) { | |
339 | /* same vendor ie, copy from | |
340 | * subelement | |
341 | */ | |
342 | memcpy(pos, tmp, tmp[1] + 2); | |
343 | pos += tmp[1] + 2; | |
c17fe043 | 344 | tmp[0] = WLAN_EID_SSID; |
0b8fb823 PX |
345 | } else { |
346 | memcpy(pos, tmp_old, tmp_old[1] + 2); | |
347 | pos += tmp_old[1] + 2; | |
348 | } | |
349 | } else { | |
350 | /* copy ie from subelement into new ie */ | |
351 | memcpy(pos, tmp, tmp[1] + 2); | |
352 | pos += tmp[1] + 2; | |
c17fe043 | 353 | tmp[0] = WLAN_EID_SSID; |
0b8fb823 PX |
354 | } |
355 | } | |
356 | ||
357 | if (tmp_old + tmp_old[1] + 2 - ie == ielen) | |
358 | break; | |
359 | ||
360 | tmp_old += tmp_old[1] + 2; | |
361 | } | |
362 | ||
363 | /* go through subelement again to check if there is any ie not | |
364 | * copied to new ie, skip ssid, capability, bssid-index ie | |
365 | */ | |
366 | tmp_new = sub_copy; | |
367 | while (tmp_new + tmp_new[1] + 2 - sub_copy <= subie_len) { | |
368 | if (!(tmp_new[0] == WLAN_EID_NON_TX_BSSID_CAP || | |
5bd9d108 | 369 | tmp_new[0] == WLAN_EID_SSID)) { |
0b8fb823 PX |
370 | memcpy(pos, tmp_new, tmp_new[1] + 2); |
371 | pos += tmp_new[1] + 2; | |
372 | } | |
373 | if (tmp_new + tmp_new[1] + 2 - sub_copy == subie_len) | |
374 | break; | |
375 | tmp_new += tmp_new[1] + 2; | |
376 | } | |
377 | ||
378 | kfree(sub_copy); | |
379 | return pos - new_ie; | |
380 | } | |
381 | ||
382 | static bool is_bss(struct cfg80211_bss *a, const u8 *bssid, | |
383 | const u8 *ssid, size_t ssid_len) | |
384 | { | |
385 | const struct cfg80211_bss_ies *ies; | |
386 | const u8 *ssidie; | |
387 | ||
388 | if (bssid && !ether_addr_equal(a->bssid, bssid)) | |
389 | return false; | |
390 | ||
391 | if (!ssid) | |
392 | return true; | |
393 | ||
394 | ies = rcu_access_pointer(a->ies); | |
395 | if (!ies) | |
396 | return false; | |
397 | ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); | |
398 | if (!ssidie) | |
399 | return false; | |
400 | if (ssidie[1] != ssid_len) | |
401 | return false; | |
402 | return memcmp(ssidie + 2, ssid, ssid_len) == 0; | |
403 | } | |
404 | ||
405 | static int | |
7011ba58 SS |
406 | cfg80211_add_nontrans_list(struct cfg80211_bss *trans_bss, |
407 | struct cfg80211_bss *nontrans_bss) | |
0b8fb823 PX |
408 | { |
409 | const u8 *ssid; | |
410 | size_t ssid_len; | |
7011ba58 | 411 | struct cfg80211_bss *bss = NULL; |
0b8fb823 PX |
412 | |
413 | rcu_read_lock(); | |
7011ba58 | 414 | ssid = ieee80211_bss_get_ie(nontrans_bss, WLAN_EID_SSID); |
0b8fb823 PX |
415 | if (!ssid) { |
416 | rcu_read_unlock(); | |
417 | return -EINVAL; | |
418 | } | |
419 | ssid_len = ssid[1]; | |
420 | ssid = ssid + 2; | |
421 | rcu_read_unlock(); | |
422 | ||
423 | /* check if nontrans_bss is in the list */ | |
424 | list_for_each_entry(bss, &trans_bss->nontrans_list, nontrans_list) { | |
7011ba58 | 425 | if (is_bss(bss, nontrans_bss->bssid, ssid, ssid_len)) |
0b8fb823 PX |
426 | return 0; |
427 | } | |
428 | ||
429 | /* add to the list */ | |
430 | list_add_tail(&nontrans_bss->nontrans_list, &trans_bss->nontrans_list); | |
431 | return 0; | |
432 | } | |
433 | ||
1b8ec87a | 434 | static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev, |
15d6030b SL |
435 | unsigned long expire_time) |
436 | { | |
437 | struct cfg80211_internal_bss *bss, *tmp; | |
438 | bool expired = false; | |
439 | ||
1b8ec87a | 440 | lockdep_assert_held(&rdev->bss_lock); |
4b1af479 | 441 | |
1b8ec87a | 442 | list_for_each_entry_safe(bss, tmp, &rdev->bss_list, list) { |
15d6030b SL |
443 | if (atomic_read(&bss->hold)) |
444 | continue; | |
445 | if (!time_after(expire_time, bss->ts)) | |
446 | continue; | |
447 | ||
1b8ec87a | 448 | if (__cfg80211_unlink_bss(rdev, bss)) |
776b3580 | 449 | expired = true; |
15d6030b SL |
450 | } |
451 | ||
452 | if (expired) | |
1b8ec87a | 453 | rdev->bss_generation++; |
15d6030b SL |
454 | } |
455 | ||
9853a55e JB |
456 | static bool cfg80211_bss_expire_oldest(struct cfg80211_registered_device *rdev) |
457 | { | |
458 | struct cfg80211_internal_bss *bss, *oldest = NULL; | |
459 | bool ret; | |
460 | ||
461 | lockdep_assert_held(&rdev->bss_lock); | |
462 | ||
463 | list_for_each_entry(bss, &rdev->bss_list, list) { | |
464 | if (atomic_read(&bss->hold)) | |
465 | continue; | |
466 | ||
467 | if (!list_empty(&bss->hidden_list) && | |
468 | !bss->pub.hidden_beacon_bss) | |
469 | continue; | |
470 | ||
471 | if (oldest && time_before(oldest->ts, bss->ts)) | |
472 | continue; | |
473 | oldest = bss; | |
474 | } | |
475 | ||
476 | if (WARN_ON(!oldest)) | |
477 | return false; | |
478 | ||
479 | /* | |
480 | * The callers make sure to increase rdev->bss_generation if anything | |
481 | * gets removed (and a new entry added), so there's no need to also do | |
482 | * it here. | |
483 | */ | |
484 | ||
485 | ret = __cfg80211_unlink_bss(rdev, oldest); | |
486 | WARN_ON(!ret); | |
487 | return ret; | |
488 | } | |
489 | ||
c8cb5b85 TM |
490 | static u8 cfg80211_parse_bss_param(u8 data, |
491 | struct cfg80211_colocated_ap *coloc_ap) | |
492 | { | |
493 | coloc_ap->oct_recommended = | |
494 | u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_OCT_RECOMMENDED); | |
495 | coloc_ap->same_ssid = | |
496 | u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_SAME_SSID); | |
497 | coloc_ap->multi_bss = | |
498 | u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_MULTI_BSSID); | |
499 | coloc_ap->transmitted_bssid = | |
500 | u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_TRANSMITTED_BSSID); | |
501 | coloc_ap->unsolicited_probe = | |
502 | u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_PROBE_ACTIVE); | |
503 | coloc_ap->colocated_ess = | |
504 | u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_COLOC_ESS); | |
505 | ||
506 | return u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_COLOC_AP); | |
507 | } | |
508 | ||
509 | static int cfg80211_calc_short_ssid(const struct cfg80211_bss_ies *ies, | |
510 | const struct element **elem, u32 *s_ssid) | |
511 | { | |
512 | ||
513 | *elem = cfg80211_find_elem(WLAN_EID_SSID, ies->data, ies->len); | |
514 | if (!*elem || (*elem)->datalen > IEEE80211_MAX_SSID_LEN) | |
515 | return -EINVAL; | |
516 | ||
517 | *s_ssid = ~crc32_le(~0, (*elem)->data, (*elem)->datalen); | |
518 | return 0; | |
519 | } | |
520 | ||
521 | static void cfg80211_free_coloc_ap_list(struct list_head *coloc_ap_list) | |
522 | { | |
523 | struct cfg80211_colocated_ap *ap, *tmp_ap; | |
524 | ||
525 | list_for_each_entry_safe(ap, tmp_ap, coloc_ap_list, list) { | |
526 | list_del(&ap->list); | |
527 | kfree(ap); | |
528 | } | |
529 | } | |
530 | ||
531 | static int cfg80211_parse_ap_info(struct cfg80211_colocated_ap *entry, | |
532 | const u8 *pos, u8 length, | |
533 | const struct element *ssid_elem, | |
534 | int s_ssid_tmp) | |
535 | { | |
536 | /* skip the TBTT offset */ | |
537 | pos++; | |
538 | ||
539 | memcpy(entry->bssid, pos, ETH_ALEN); | |
540 | pos += ETH_ALEN; | |
541 | ||
542 | if (length == IEEE80211_TBTT_INFO_OFFSET_BSSID_SSSID_BSS_PARAM) { | |
543 | memcpy(&entry->short_ssid, pos, | |
544 | sizeof(entry->short_ssid)); | |
545 | entry->short_ssid_valid = true; | |
546 | pos += 4; | |
547 | } | |
548 | ||
549 | /* skip non colocated APs */ | |
550 | if (!cfg80211_parse_bss_param(*pos, entry)) | |
551 | return -EINVAL; | |
552 | pos++; | |
553 | ||
554 | if (length == IEEE80211_TBTT_INFO_OFFSET_BSSID_BSS_PARAM) { | |
555 | /* | |
556 | * no information about the short ssid. Consider the entry valid | |
557 | * for now. It would later be dropped in case there are explicit | |
558 | * SSIDs that need to be matched | |
559 | */ | |
560 | if (!entry->same_ssid) | |
561 | return 0; | |
562 | } | |
563 | ||
564 | if (entry->same_ssid) { | |
565 | entry->short_ssid = s_ssid_tmp; | |
566 | entry->short_ssid_valid = true; | |
567 | ||
568 | /* | |
569 | * This is safe because we validate datalen in | |
570 | * cfg80211_parse_colocated_ap(), before calling this | |
571 | * function. | |
572 | */ | |
573 | memcpy(&entry->ssid, &ssid_elem->data, | |
574 | ssid_elem->datalen); | |
575 | entry->ssid_len = ssid_elem->datalen; | |
576 | } | |
577 | return 0; | |
578 | } | |
579 | ||
580 | static int cfg80211_parse_colocated_ap(const struct cfg80211_bss_ies *ies, | |
581 | struct list_head *list) | |
582 | { | |
583 | struct ieee80211_neighbor_ap_info *ap_info; | |
584 | const struct element *elem, *ssid_elem; | |
585 | const u8 *pos, *end; | |
586 | u32 s_ssid_tmp; | |
587 | int n_coloc = 0, ret; | |
588 | LIST_HEAD(ap_list); | |
589 | ||
590 | elem = cfg80211_find_elem(WLAN_EID_REDUCED_NEIGHBOR_REPORT, ies->data, | |
591 | ies->len); | |
8a16ffdc | 592 | if (!elem) |
c8cb5b85 TM |
593 | return 0; |
594 | ||
595 | pos = elem->data; | |
596 | end = pos + elem->datalen; | |
597 | ||
598 | ret = cfg80211_calc_short_ssid(ies, &ssid_elem, &s_ssid_tmp); | |
599 | if (ret) | |
600 | return ret; | |
601 | ||
602 | /* RNR IE may contain more than one NEIGHBOR_AP_INFO */ | |
603 | while (pos + sizeof(*ap_info) <= end) { | |
604 | enum nl80211_band band; | |
605 | int freq; | |
606 | u8 length, i, count; | |
607 | ||
608 | ap_info = (void *)pos; | |
609 | count = u8_get_bits(ap_info->tbtt_info_hdr, | |
610 | IEEE80211_AP_INFO_TBTT_HDR_COUNT) + 1; | |
611 | length = ap_info->tbtt_info_len; | |
612 | ||
613 | pos += sizeof(*ap_info); | |
614 | ||
615 | if (!ieee80211_operating_class_to_band(ap_info->op_class, | |
616 | &band)) | |
617 | break; | |
618 | ||
619 | freq = ieee80211_channel_to_frequency(ap_info->channel, band); | |
620 | ||
621 | if (end - pos < count * ap_info->tbtt_info_len) | |
622 | break; | |
623 | ||
624 | /* | |
625 | * TBTT info must include bss param + BSSID + | |
626 | * (short SSID or same_ssid bit to be set). | |
627 | * ignore other options, and move to the | |
628 | * next AP info | |
629 | */ | |
630 | if (band != NL80211_BAND_6GHZ || | |
631 | (length != IEEE80211_TBTT_INFO_OFFSET_BSSID_BSS_PARAM && | |
632 | length < IEEE80211_TBTT_INFO_OFFSET_BSSID_SSSID_BSS_PARAM)) { | |
633 | pos += count * ap_info->tbtt_info_len; | |
634 | continue; | |
635 | } | |
636 | ||
637 | for (i = 0; i < count; i++) { | |
638 | struct cfg80211_colocated_ap *entry; | |
639 | ||
640 | entry = kzalloc(sizeof(*entry) + IEEE80211_MAX_SSID_LEN, | |
641 | GFP_ATOMIC); | |
642 | ||
643 | if (!entry) | |
644 | break; | |
645 | ||
646 | entry->center_freq = freq; | |
647 | ||
648 | if (!cfg80211_parse_ap_info(entry, pos, length, | |
649 | ssid_elem, s_ssid_tmp)) { | |
650 | n_coloc++; | |
651 | list_add_tail(&entry->list, &ap_list); | |
652 | } else { | |
653 | kfree(entry); | |
654 | } | |
655 | ||
656 | pos += ap_info->tbtt_info_len; | |
657 | } | |
658 | } | |
659 | ||
660 | if (pos != end) { | |
661 | cfg80211_free_coloc_ap_list(&ap_list); | |
662 | return 0; | |
663 | } | |
664 | ||
665 | list_splice_tail(&ap_list, list); | |
666 | return n_coloc; | |
667 | } | |
668 | ||
669 | static void cfg80211_scan_req_add_chan(struct cfg80211_scan_request *request, | |
670 | struct ieee80211_channel *chan, | |
671 | bool add_to_6ghz) | |
672 | { | |
673 | int i; | |
674 | u32 n_channels = request->n_channels; | |
675 | struct cfg80211_scan_6ghz_params *params = | |
676 | &request->scan_6ghz_params[request->n_6ghz_params]; | |
677 | ||
678 | for (i = 0; i < n_channels; i++) { | |
679 | if (request->channels[i] == chan) { | |
680 | if (add_to_6ghz) | |
681 | params->channel_idx = i; | |
682 | return; | |
683 | } | |
684 | } | |
685 | ||
686 | request->channels[n_channels] = chan; | |
687 | if (add_to_6ghz) | |
688 | request->scan_6ghz_params[request->n_6ghz_params].channel_idx = | |
689 | n_channels; | |
690 | ||
691 | request->n_channels++; | |
692 | } | |
693 | ||
694 | static bool cfg80211_find_ssid_match(struct cfg80211_colocated_ap *ap, | |
695 | struct cfg80211_scan_request *request) | |
696 | { | |
ba5c2523 | 697 | int i; |
c8cb5b85 TM |
698 | u32 s_ssid; |
699 | ||
700 | for (i = 0; i < request->n_ssids; i++) { | |
701 | /* wildcard ssid in the scan request */ | |
702 | if (!request->ssids[i].ssid_len) | |
703 | return true; | |
704 | ||
705 | if (ap->ssid_len && | |
706 | ap->ssid_len == request->ssids[i].ssid_len) { | |
707 | if (!memcmp(request->ssids[i].ssid, ap->ssid, | |
708 | ap->ssid_len)) | |
709 | return true; | |
710 | } else if (ap->short_ssid_valid) { | |
711 | s_ssid = ~crc32_le(~0, request->ssids[i].ssid, | |
712 | request->ssids[i].ssid_len); | |
713 | ||
714 | if (ap->short_ssid == s_ssid) | |
715 | return true; | |
716 | } | |
717 | } | |
718 | ||
719 | return false; | |
720 | } | |
721 | ||
722 | static int cfg80211_scan_6ghz(struct cfg80211_registered_device *rdev) | |
723 | { | |
724 | u8 i; | |
725 | struct cfg80211_colocated_ap *ap; | |
726 | int n_channels, count = 0, err; | |
727 | struct cfg80211_scan_request *request, *rdev_req = rdev->scan_req; | |
728 | LIST_HEAD(coloc_ap_list); | |
d590a125 | 729 | bool need_scan_psc = true; |
c8cb5b85 TM |
730 | const struct ieee80211_sband_iftype_data *iftd; |
731 | ||
732 | rdev_req->scan_6ghz = true; | |
733 | ||
734 | if (!rdev->wiphy.bands[NL80211_BAND_6GHZ]) | |
735 | return -EOPNOTSUPP; | |
736 | ||
737 | iftd = ieee80211_get_sband_iftype_data(rdev->wiphy.bands[NL80211_BAND_6GHZ], | |
738 | rdev_req->wdev->iftype); | |
739 | if (!iftd || !iftd->he_cap.has_he) | |
740 | return -EOPNOTSUPP; | |
741 | ||
742 | n_channels = rdev->wiphy.bands[NL80211_BAND_6GHZ]->n_channels; | |
743 | ||
744 | if (rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ) { | |
745 | struct cfg80211_internal_bss *intbss; | |
746 | ||
747 | spin_lock_bh(&rdev->bss_lock); | |
748 | list_for_each_entry(intbss, &rdev->bss_list, list) { | |
749 | struct cfg80211_bss *res = &intbss->pub; | |
750 | const struct cfg80211_bss_ies *ies; | |
751 | ||
752 | ies = rcu_access_pointer(res->ies); | |
753 | count += cfg80211_parse_colocated_ap(ies, | |
754 | &coloc_ap_list); | |
755 | } | |
756 | spin_unlock_bh(&rdev->bss_lock); | |
757 | } | |
758 | ||
759 | request = kzalloc(struct_size(request, channels, n_channels) + | |
760 | sizeof(*request->scan_6ghz_params) * count, | |
761 | GFP_KERNEL); | |
762 | if (!request) { | |
763 | cfg80211_free_coloc_ap_list(&coloc_ap_list); | |
764 | return -ENOMEM; | |
765 | } | |
766 | ||
767 | *request = *rdev_req; | |
768 | request->n_channels = 0; | |
769 | request->scan_6ghz_params = | |
770 | (void *)&request->channels[n_channels]; | |
771 | ||
772 | /* | |
d590a125 AB |
773 | * PSC channels should not be scanned in case of direct scan with 1 SSID |
774 | * and at least one of the reported co-located APs with same SSID | |
775 | * indicating that all APs in the same ESS are co-located | |
c8cb5b85 | 776 | */ |
d590a125 | 777 | if (count && request->n_ssids == 1 && request->ssids[0].ssid_len) { |
c8cb5b85 | 778 | list_for_each_entry(ap, &coloc_ap_list, list) { |
d590a125 AB |
779 | if (ap->colocated_ess && |
780 | cfg80211_find_ssid_match(ap, request)) { | |
781 | need_scan_psc = false; | |
c8cb5b85 TM |
782 | break; |
783 | } | |
784 | } | |
c8cb5b85 TM |
785 | } |
786 | ||
787 | /* | |
788 | * add to the scan request the channels that need to be scanned | |
789 | * regardless of the collocated APs (PSC channels or all channels | |
790 | * in case that NL80211_SCAN_FLAG_COLOCATED_6GHZ is not set) | |
791 | */ | |
792 | for (i = 0; i < rdev_req->n_channels; i++) { | |
793 | if (rdev_req->channels[i]->band == NL80211_BAND_6GHZ && | |
794 | ((need_scan_psc && | |
795 | cfg80211_channel_is_psc(rdev_req->channels[i])) || | |
796 | !(rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ))) { | |
797 | cfg80211_scan_req_add_chan(request, | |
798 | rdev_req->channels[i], | |
799 | false); | |
800 | } | |
801 | } | |
802 | ||
803 | if (!(rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ)) | |
804 | goto skip; | |
805 | ||
806 | list_for_each_entry(ap, &coloc_ap_list, list) { | |
807 | bool found = false; | |
808 | struct cfg80211_scan_6ghz_params *scan_6ghz_params = | |
809 | &request->scan_6ghz_params[request->n_6ghz_params]; | |
810 | struct ieee80211_channel *chan = | |
811 | ieee80211_get_channel(&rdev->wiphy, ap->center_freq); | |
812 | ||
813 | if (!chan || chan->flags & IEEE80211_CHAN_DISABLED) | |
814 | continue; | |
815 | ||
816 | for (i = 0; i < rdev_req->n_channels; i++) { | |
817 | if (rdev_req->channels[i] == chan) | |
818 | found = true; | |
819 | } | |
820 | ||
821 | if (!found) | |
822 | continue; | |
823 | ||
824 | if (request->n_ssids > 0 && | |
825 | !cfg80211_find_ssid_match(ap, request)) | |
826 | continue; | |
827 | ||
828 | cfg80211_scan_req_add_chan(request, chan, true); | |
829 | memcpy(scan_6ghz_params->bssid, ap->bssid, ETH_ALEN); | |
830 | scan_6ghz_params->short_ssid = ap->short_ssid; | |
831 | scan_6ghz_params->short_ssid_valid = ap->short_ssid_valid; | |
832 | scan_6ghz_params->unsolicited_probe = ap->unsolicited_probe; | |
833 | ||
834 | /* | |
835 | * If a PSC channel is added to the scan and 'need_scan_psc' is | |
836 | * set to false, then all the APs that the scan logic is | |
837 | * interested with on the channel are collocated and thus there | |
838 | * is no need to perform the initial PSC channel listen. | |
839 | */ | |
840 | if (cfg80211_channel_is_psc(chan) && !need_scan_psc) | |
841 | scan_6ghz_params->psc_no_listen = true; | |
842 | ||
843 | request->n_6ghz_params++; | |
844 | } | |
845 | ||
846 | skip: | |
847 | cfg80211_free_coloc_ap_list(&coloc_ap_list); | |
848 | ||
849 | if (request->n_channels) { | |
850 | struct cfg80211_scan_request *old = rdev->int_scan_req; | |
851 | ||
852 | rdev->int_scan_req = request; | |
853 | ||
854 | /* | |
855 | * If this scan follows a previous scan, save the scan start | |
856 | * info from the first part of the scan | |
857 | */ | |
858 | if (old) | |
859 | rdev->int_scan_req->info = old->info; | |
860 | ||
861 | err = rdev_scan(rdev, request); | |
862 | if (err) { | |
863 | rdev->int_scan_req = old; | |
864 | kfree(request); | |
865 | } else { | |
866 | kfree(old); | |
867 | } | |
868 | ||
869 | return err; | |
870 | } | |
871 | ||
872 | kfree(request); | |
873 | return -EINVAL; | |
874 | } | |
875 | ||
876 | int cfg80211_scan(struct cfg80211_registered_device *rdev) | |
877 | { | |
878 | struct cfg80211_scan_request *request; | |
879 | struct cfg80211_scan_request *rdev_req = rdev->scan_req; | |
880 | u32 n_channels = 0, idx, i; | |
881 | ||
882 | if (!(rdev->wiphy.flags & WIPHY_FLAG_SPLIT_SCAN_6GHZ)) | |
883 | return rdev_scan(rdev, rdev_req); | |
884 | ||
885 | for (i = 0; i < rdev_req->n_channels; i++) { | |
886 | if (rdev_req->channels[i]->band != NL80211_BAND_6GHZ) | |
887 | n_channels++; | |
888 | } | |
889 | ||
890 | if (!n_channels) | |
891 | return cfg80211_scan_6ghz(rdev); | |
892 | ||
893 | request = kzalloc(struct_size(request, channels, n_channels), | |
894 | GFP_KERNEL); | |
895 | if (!request) | |
896 | return -ENOMEM; | |
897 | ||
898 | *request = *rdev_req; | |
899 | request->n_channels = n_channels; | |
900 | ||
901 | for (i = idx = 0; i < rdev_req->n_channels; i++) { | |
902 | if (rdev_req->channels[i]->band != NL80211_BAND_6GHZ) | |
903 | request->channels[idx++] = rdev_req->channels[i]; | |
904 | } | |
905 | ||
906 | rdev_req->scan_6ghz = false; | |
907 | rdev->int_scan_req = request; | |
908 | return rdev_scan(rdev, request); | |
909 | } | |
910 | ||
f9d15d16 JB |
911 | void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, |
912 | bool send_message) | |
2a519311 | 913 | { |
c8cb5b85 | 914 | struct cfg80211_scan_request *request, *rdev_req; |
fd014284 | 915 | struct wireless_dev *wdev; |
f9d15d16 | 916 | struct sk_buff *msg; |
3d23e349 | 917 | #ifdef CONFIG_CFG80211_WEXT |
2a519311 JB |
918 | union iwreq_data wrqu; |
919 | #endif | |
920 | ||
a05829a7 | 921 | lockdep_assert_held(&rdev->wiphy.mtx); |
01a0ac41 | 922 | |
f9d15d16 | 923 | if (rdev->scan_msg) { |
505a2e88 | 924 | nl80211_send_scan_msg(rdev, rdev->scan_msg); |
f9d15d16 JB |
925 | rdev->scan_msg = NULL; |
926 | return; | |
927 | } | |
667503dd | 928 | |
c8cb5b85 TM |
929 | rdev_req = rdev->scan_req; |
930 | if (!rdev_req) | |
01a0ac41 JB |
931 | return; |
932 | ||
c8cb5b85 TM |
933 | wdev = rdev_req->wdev; |
934 | request = rdev->int_scan_req ? rdev->int_scan_req : rdev_req; | |
935 | ||
936 | if (wdev_running(wdev) && | |
937 | (rdev->wiphy.flags & WIPHY_FLAG_SPLIT_SCAN_6GHZ) && | |
938 | !rdev_req->scan_6ghz && !request->info.aborted && | |
939 | !cfg80211_scan_6ghz(rdev)) | |
940 | return; | |
2a519311 | 941 | |
6829c878 JB |
942 | /* |
943 | * This must be before sending the other events! | |
944 | * Otherwise, wpa_supplicant gets completely confused with | |
945 | * wext events. | |
946 | */ | |
fd014284 JB |
947 | if (wdev->netdev) |
948 | cfg80211_sme_scan_done(wdev->netdev); | |
6829c878 | 949 | |
1d76250b | 950 | if (!request->info.aborted && |
f9d15d16 JB |
951 | request->flags & NL80211_SCAN_FLAG_FLUSH) { |
952 | /* flush entries from previous scans */ | |
953 | spin_lock_bh(&rdev->bss_lock); | |
954 | __cfg80211_bss_expire(rdev, request->scan_start); | |
955 | spin_unlock_bh(&rdev->bss_lock); | |
15d6030b | 956 | } |
2a519311 | 957 | |
1d76250b | 958 | msg = nl80211_build_scan_msg(rdev, wdev, request->info.aborted); |
f9d15d16 | 959 | |
3d23e349 | 960 | #ifdef CONFIG_CFG80211_WEXT |
1d76250b | 961 | if (wdev->netdev && !request->info.aborted) { |
2a519311 JB |
962 | memset(&wrqu, 0, sizeof(wrqu)); |
963 | ||
fd014284 | 964 | wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL); |
2a519311 JB |
965 | } |
966 | #endif | |
967 | ||
fd014284 JB |
968 | if (wdev->netdev) |
969 | dev_put(wdev->netdev); | |
2a519311 | 970 | |
c8cb5b85 TM |
971 | kfree(rdev->int_scan_req); |
972 | rdev->int_scan_req = NULL; | |
973 | ||
974 | kfree(rdev->scan_req); | |
36e6fea8 | 975 | rdev->scan_req = NULL; |
f9d15d16 JB |
976 | |
977 | if (!send_message) | |
978 | rdev->scan_msg = msg; | |
979 | else | |
505a2e88 | 980 | nl80211_send_scan_msg(rdev, msg); |
2a519311 | 981 | } |
667503dd | 982 | |
36e6fea8 JB |
983 | void __cfg80211_scan_done(struct work_struct *wk) |
984 | { | |
985 | struct cfg80211_registered_device *rdev; | |
986 | ||
987 | rdev = container_of(wk, struct cfg80211_registered_device, | |
988 | scan_done_wk); | |
989 | ||
a05829a7 | 990 | wiphy_lock(&rdev->wiphy); |
f9d15d16 | 991 | ___cfg80211_scan_done(rdev, true); |
a05829a7 | 992 | wiphy_unlock(&rdev->wiphy); |
36e6fea8 JB |
993 | } |
994 | ||
1d76250b AS |
995 | void cfg80211_scan_done(struct cfg80211_scan_request *request, |
996 | struct cfg80211_scan_info *info) | |
667503dd | 997 | { |
c8cb5b85 TM |
998 | struct cfg80211_scan_info old_info = request->info; |
999 | ||
1d76250b | 1000 | trace_cfg80211_scan_done(request, info); |
c8cb5b85 TM |
1001 | WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req && |
1002 | request != wiphy_to_rdev(request->wiphy)->int_scan_req); | |
667503dd | 1003 | |
1d76250b | 1004 | request->info = *info; |
c8cb5b85 TM |
1005 | |
1006 | /* | |
1007 | * In case the scan is split, the scan_start_tsf and tsf_bssid should | |
1008 | * be of the first part. In such a case old_info.scan_start_tsf should | |
1009 | * be non zero. | |
1010 | */ | |
1011 | if (request->scan_6ghz && old_info.scan_start_tsf) { | |
1012 | request->info.scan_start_tsf = old_info.scan_start_tsf; | |
1013 | memcpy(request->info.tsf_bssid, old_info.tsf_bssid, | |
1014 | sizeof(request->info.tsf_bssid)); | |
1015 | } | |
1016 | ||
5fe231e8 | 1017 | request->notified = true; |
f26cbf40 | 1018 | queue_work(cfg80211_wq, &wiphy_to_rdev(request->wiphy)->scan_done_wk); |
667503dd | 1019 | } |
2a519311 JB |
1020 | EXPORT_SYMBOL(cfg80211_scan_done); |
1021 | ||
ca986ad9 AVS |
1022 | void cfg80211_add_sched_scan_req(struct cfg80211_registered_device *rdev, |
1023 | struct cfg80211_sched_scan_request *req) | |
1024 | { | |
a05829a7 | 1025 | lockdep_assert_held(&rdev->wiphy.mtx); |
ca986ad9 AVS |
1026 | |
1027 | list_add_rcu(&req->list, &rdev->sched_scan_req_list); | |
1028 | } | |
1029 | ||
1030 | static void cfg80211_del_sched_scan_req(struct cfg80211_registered_device *rdev, | |
1031 | struct cfg80211_sched_scan_request *req) | |
1032 | { | |
a05829a7 | 1033 | lockdep_assert_held(&rdev->wiphy.mtx); |
ca986ad9 AVS |
1034 | |
1035 | list_del_rcu(&req->list); | |
1036 | kfree_rcu(req, rcu_head); | |
1037 | } | |
1038 | ||
1039 | static struct cfg80211_sched_scan_request * | |
1040 | cfg80211_find_sched_scan_req(struct cfg80211_registered_device *rdev, u64 reqid) | |
1041 | { | |
1042 | struct cfg80211_sched_scan_request *pos; | |
1043 | ||
3ee9306b | 1044 | list_for_each_entry_rcu(pos, &rdev->sched_scan_req_list, list, |
a05829a7 | 1045 | lockdep_is_held(&rdev->wiphy.mtx)) { |
ca986ad9 AVS |
1046 | if (pos->reqid == reqid) |
1047 | return pos; | |
1048 | } | |
b34939b9 | 1049 | return NULL; |
ca986ad9 AVS |
1050 | } |
1051 | ||
1052 | /* | |
1053 | * Determines if a scheduled scan request can be handled. When a legacy | |
1054 | * scheduled scan is running no other scheduled scan is allowed regardless | |
1055 | * whether the request is for legacy or multi-support scan. When a multi-support | |
1056 | * scheduled scan is running a request for legacy scan is not allowed. In this | |
1057 | * case a request for multi-support scan can be handled if resources are | |
1058 | * available, ie. struct wiphy::max_sched_scan_reqs limit is not yet reached. | |
1059 | */ | |
1060 | int cfg80211_sched_scan_req_possible(struct cfg80211_registered_device *rdev, | |
1061 | bool want_multi) | |
1062 | { | |
1063 | struct cfg80211_sched_scan_request *pos; | |
1064 | int i = 0; | |
1065 | ||
1066 | list_for_each_entry(pos, &rdev->sched_scan_req_list, list) { | |
1067 | /* request id zero means legacy in progress */ | |
1068 | if (!i && !pos->reqid) | |
1069 | return -EINPROGRESS; | |
1070 | i++; | |
1071 | } | |
1072 | ||
1073 | if (i) { | |
1074 | /* no legacy allowed when multi request(s) are active */ | |
1075 | if (!want_multi) | |
1076 | return -EINPROGRESS; | |
1077 | ||
1078 | /* resource limit reached */ | |
1079 | if (i == rdev->wiphy.max_sched_scan_reqs) | |
1080 | return -ENOSPC; | |
1081 | } | |
1082 | return 0; | |
1083 | } | |
1084 | ||
b34939b9 | 1085 | void cfg80211_sched_scan_results_wk(struct work_struct *work) |
807f8a8c LC |
1086 | { |
1087 | struct cfg80211_registered_device *rdev; | |
b34939b9 | 1088 | struct cfg80211_sched_scan_request *req, *tmp; |
807f8a8c | 1089 | |
b34939b9 AVS |
1090 | rdev = container_of(work, struct cfg80211_registered_device, |
1091 | sched_scan_res_wk); | |
807f8a8c | 1092 | |
a05829a7 | 1093 | wiphy_lock(&rdev->wiphy); |
b34939b9 AVS |
1094 | list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) { |
1095 | if (req->report_results) { | |
1096 | req->report_results = false; | |
1097 | if (req->flags & NL80211_SCAN_FLAG_FLUSH) { | |
1098 | /* flush entries from previous scans */ | |
1099 | spin_lock_bh(&rdev->bss_lock); | |
1100 | __cfg80211_bss_expire(rdev, req->scan_start); | |
1101 | spin_unlock_bh(&rdev->bss_lock); | |
1102 | req->scan_start = jiffies; | |
1103 | } | |
1104 | nl80211_send_sched_scan(req, | |
1105 | NL80211_CMD_SCHED_SCAN_RESULTS); | |
15d6030b | 1106 | } |
15d6030b | 1107 | } |
a05829a7 | 1108 | wiphy_unlock(&rdev->wiphy); |
807f8a8c LC |
1109 | } |
1110 | ||
b34939b9 | 1111 | void cfg80211_sched_scan_results(struct wiphy *wiphy, u64 reqid) |
807f8a8c | 1112 | { |
ca986ad9 AVS |
1113 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
1114 | struct cfg80211_sched_scan_request *request; | |
1115 | ||
b34939b9 | 1116 | trace_cfg80211_sched_scan_results(wiphy, reqid); |
807f8a8c | 1117 | /* ignore if we're not scanning */ |
31a60ed1 | 1118 | |
1b57b621 | 1119 | rcu_read_lock(); |
b34939b9 AVS |
1120 | request = cfg80211_find_sched_scan_req(rdev, reqid); |
1121 | if (request) { | |
1122 | request->report_results = true; | |
1123 | queue_work(cfg80211_wq, &rdev->sched_scan_res_wk); | |
1124 | } | |
1b57b621 | 1125 | rcu_read_unlock(); |
807f8a8c LC |
1126 | } |
1127 | EXPORT_SYMBOL(cfg80211_sched_scan_results); | |
1128 | ||
a05829a7 | 1129 | void cfg80211_sched_scan_stopped_locked(struct wiphy *wiphy, u64 reqid) |
807f8a8c | 1130 | { |
f26cbf40 | 1131 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
807f8a8c | 1132 | |
a05829a7 | 1133 | lockdep_assert_held(&wiphy->mtx); |
792e6aa7 | 1134 | |
b34939b9 | 1135 | trace_cfg80211_sched_scan_stopped(wiphy, reqid); |
4ee3e063 | 1136 | |
b34939b9 | 1137 | __cfg80211_stop_sched_scan(rdev, reqid, true); |
792e6aa7 | 1138 | } |
a05829a7 | 1139 | EXPORT_SYMBOL(cfg80211_sched_scan_stopped_locked); |
792e6aa7 | 1140 | |
b34939b9 | 1141 | void cfg80211_sched_scan_stopped(struct wiphy *wiphy, u64 reqid) |
792e6aa7 | 1142 | { |
a05829a7 JB |
1143 | wiphy_lock(wiphy); |
1144 | cfg80211_sched_scan_stopped_locked(wiphy, reqid); | |
1145 | wiphy_unlock(wiphy); | |
807f8a8c | 1146 | } |
807f8a8c LC |
1147 | EXPORT_SYMBOL(cfg80211_sched_scan_stopped); |
1148 | ||
ca986ad9 AVS |
1149 | int cfg80211_stop_sched_scan_req(struct cfg80211_registered_device *rdev, |
1150 | struct cfg80211_sched_scan_request *req, | |
1151 | bool driver_initiated) | |
807f8a8c | 1152 | { |
a05829a7 | 1153 | lockdep_assert_held(&rdev->wiphy.mtx); |
807f8a8c | 1154 | |
85a9994a | 1155 | if (!driver_initiated) { |
3a3ecf1d | 1156 | int err = rdev_sched_scan_stop(rdev, req->dev, req->reqid); |
85a9994a LC |
1157 | if (err) |
1158 | return err; | |
1159 | } | |
807f8a8c | 1160 | |
ca986ad9 | 1161 | nl80211_send_sched_scan(req, NL80211_CMD_SCHED_SCAN_STOPPED); |
807f8a8c | 1162 | |
ca986ad9 | 1163 | cfg80211_del_sched_scan_req(rdev, req); |
807f8a8c | 1164 | |
3b4670ff | 1165 | return 0; |
807f8a8c LC |
1166 | } |
1167 | ||
ca986ad9 AVS |
1168 | int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev, |
1169 | u64 reqid, bool driver_initiated) | |
1170 | { | |
1171 | struct cfg80211_sched_scan_request *sched_scan_req; | |
1172 | ||
a05829a7 | 1173 | lockdep_assert_held(&rdev->wiphy.mtx); |
ca986ad9 AVS |
1174 | |
1175 | sched_scan_req = cfg80211_find_sched_scan_req(rdev, reqid); | |
b34939b9 AVS |
1176 | if (!sched_scan_req) |
1177 | return -ENOENT; | |
ca986ad9 AVS |
1178 | |
1179 | return cfg80211_stop_sched_scan_req(rdev, sched_scan_req, | |
1180 | driver_initiated); | |
1181 | } | |
1182 | ||
1b8ec87a | 1183 | void cfg80211_bss_age(struct cfg80211_registered_device *rdev, |
cb3a8eec DW |
1184 | unsigned long age_secs) |
1185 | { | |
1186 | struct cfg80211_internal_bss *bss; | |
1187 | unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); | |
1188 | ||
1b8ec87a ZG |
1189 | spin_lock_bh(&rdev->bss_lock); |
1190 | list_for_each_entry(bss, &rdev->bss_list, list) | |
cb3a8eec | 1191 | bss->ts -= age_jiffies; |
1b8ec87a | 1192 | spin_unlock_bh(&rdev->bss_lock); |
cb3a8eec DW |
1193 | } |
1194 | ||
1b8ec87a | 1195 | void cfg80211_bss_expire(struct cfg80211_registered_device *rdev) |
2a519311 | 1196 | { |
1b8ec87a | 1197 | __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE); |
2a519311 JB |
1198 | } |
1199 | ||
2f1805ea EG |
1200 | void cfg80211_bss_flush(struct wiphy *wiphy) |
1201 | { | |
1202 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); | |
1203 | ||
1204 | spin_lock_bh(&rdev->bss_lock); | |
1205 | __cfg80211_bss_expire(rdev, jiffies); | |
1206 | spin_unlock_bh(&rdev->bss_lock); | |
1207 | } | |
1208 | EXPORT_SYMBOL(cfg80211_bss_flush); | |
1209 | ||
49a68e0d JB |
1210 | const struct element * |
1211 | cfg80211_find_elem_match(u8 eid, const u8 *ies, unsigned int len, | |
1212 | const u8 *match, unsigned int match_len, | |
1213 | unsigned int match_offset) | |
2a519311 | 1214 | { |
0f3b07f0 JB |
1215 | const struct element *elem; |
1216 | ||
0f3b07f0 | 1217 | for_each_element_id(elem, eid, ies, len) { |
49a68e0d JB |
1218 | if (elem->datalen >= match_offset + match_len && |
1219 | !memcmp(elem->data + match_offset, match, match_len)) | |
1220 | return elem; | |
2a519311 | 1221 | } |
fbd05e4a LC |
1222 | |
1223 | return NULL; | |
2a519311 | 1224 | } |
49a68e0d | 1225 | EXPORT_SYMBOL(cfg80211_find_elem_match); |
2a519311 | 1226 | |
49a68e0d JB |
1227 | const struct element *cfg80211_find_vendor_elem(unsigned int oui, int oui_type, |
1228 | const u8 *ies, | |
1229 | unsigned int len) | |
0c28ec58 | 1230 | { |
49a68e0d | 1231 | const struct element *elem; |
fbd05e4a LC |
1232 | u8 match[] = { oui >> 16, oui >> 8, oui, oui_type }; |
1233 | int match_len = (oui_type < 0) ? 3 : sizeof(match); | |
0c28ec58 | 1234 | |
9e9ea439 EG |
1235 | if (WARN_ON(oui_type > 0xff)) |
1236 | return NULL; | |
1237 | ||
49a68e0d JB |
1238 | elem = cfg80211_find_elem_match(WLAN_EID_VENDOR_SPECIFIC, ies, len, |
1239 | match, match_len, 0); | |
6719429d | 1240 | |
49a68e0d | 1241 | if (!elem || elem->datalen < 4) |
fbd05e4a | 1242 | return NULL; |
6719429d | 1243 | |
49a68e0d | 1244 | return elem; |
0c28ec58 | 1245 | } |
49a68e0d | 1246 | EXPORT_SYMBOL(cfg80211_find_vendor_elem); |
0c28ec58 | 1247 | |
4593c4cb JB |
1248 | /** |
1249 | * enum bss_compare_mode - BSS compare mode | |
1250 | * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find) | |
1251 | * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode | |
1252 | * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode | |
1253 | */ | |
1254 | enum bss_compare_mode { | |
1255 | BSS_CMP_REGULAR, | |
1256 | BSS_CMP_HIDE_ZLEN, | |
1257 | BSS_CMP_HIDE_NUL, | |
1258 | }; | |
1259 | ||
dd9dfb9f | 1260 | static int cmp_bss(struct cfg80211_bss *a, |
5622f5bb | 1261 | struct cfg80211_bss *b, |
4593c4cb | 1262 | enum bss_compare_mode mode) |
dd9dfb9f | 1263 | { |
9caf0364 | 1264 | const struct cfg80211_bss_ies *a_ies, *b_ies; |
3af6341c JB |
1265 | const u8 *ie1 = NULL; |
1266 | const u8 *ie2 = NULL; | |
5622f5bb | 1267 | int i, r; |
dd9dfb9f | 1268 | |
3af6341c JB |
1269 | if (a->channel != b->channel) |
1270 | return b->channel->center_freq - a->channel->center_freq; | |
dd9dfb9f | 1271 | |
9caf0364 JB |
1272 | a_ies = rcu_access_pointer(a->ies); |
1273 | if (!a_ies) | |
1274 | return -1; | |
1275 | b_ies = rcu_access_pointer(b->ies); | |
1276 | if (!b_ies) | |
1277 | return 1; | |
1278 | ||
3af6341c JB |
1279 | if (WLAN_CAPABILITY_IS_STA_BSS(a->capability)) |
1280 | ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID, | |
1281 | a_ies->data, a_ies->len); | |
1282 | if (WLAN_CAPABILITY_IS_STA_BSS(b->capability)) | |
1283 | ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID, | |
1284 | b_ies->data, b_ies->len); | |
1285 | if (ie1 && ie2) { | |
1286 | int mesh_id_cmp; | |
1287 | ||
1288 | if (ie1[1] == ie2[1]) | |
1289 | mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]); | |
1290 | else | |
1291 | mesh_id_cmp = ie2[1] - ie1[1]; | |
1292 | ||
1293 | ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, | |
1294 | a_ies->data, a_ies->len); | |
1295 | ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, | |
1296 | b_ies->data, b_ies->len); | |
1297 | if (ie1 && ie2) { | |
1298 | if (mesh_id_cmp) | |
1299 | return mesh_id_cmp; | |
1300 | if (ie1[1] != ie2[1]) | |
1301 | return ie2[1] - ie1[1]; | |
1302 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); | |
1303 | } | |
1304 | } | |
1305 | ||
3af6341c JB |
1306 | r = memcmp(a->bssid, b->bssid, sizeof(a->bssid)); |
1307 | if (r) | |
1308 | return r; | |
1309 | ||
9caf0364 JB |
1310 | ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len); |
1311 | ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len); | |
dd9dfb9f | 1312 | |
5622f5bb JB |
1313 | if (!ie1 && !ie2) |
1314 | return 0; | |
1315 | ||
f94f8b16 | 1316 | /* |
5622f5bb JB |
1317 | * Note that with "hide_ssid", the function returns a match if |
1318 | * the already-present BSS ("b") is a hidden SSID beacon for | |
1319 | * the new BSS ("a"). | |
f94f8b16 | 1320 | */ |
dd9dfb9f DT |
1321 | |
1322 | /* sort missing IE before (left of) present IE */ | |
1323 | if (!ie1) | |
1324 | return -1; | |
1325 | if (!ie2) | |
1326 | return 1; | |
1327 | ||
4593c4cb JB |
1328 | switch (mode) { |
1329 | case BSS_CMP_HIDE_ZLEN: | |
1330 | /* | |
1331 | * In ZLEN mode we assume the BSS entry we're | |
1332 | * looking for has a zero-length SSID. So if | |
1333 | * the one we're looking at right now has that, | |
1334 | * return 0. Otherwise, return the difference | |
1335 | * in length, but since we're looking for the | |
1336 | * 0-length it's really equivalent to returning | |
1337 | * the length of the one we're looking at. | |
1338 | * | |
1339 | * No content comparison is needed as we assume | |
1340 | * the content length is zero. | |
1341 | */ | |
1342 | return ie2[1]; | |
1343 | case BSS_CMP_REGULAR: | |
1344 | default: | |
1345 | /* sort by length first, then by contents */ | |
1346 | if (ie1[1] != ie2[1]) | |
1347 | return ie2[1] - ie1[1]; | |
5622f5bb | 1348 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); |
4593c4cb JB |
1349 | case BSS_CMP_HIDE_NUL: |
1350 | if (ie1[1] != ie2[1]) | |
1351 | return ie2[1] - ie1[1]; | |
1352 | /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */ | |
1353 | for (i = 0; i < ie2[1]; i++) | |
1354 | if (ie2[i + 2]) | |
1355 | return -1; | |
1356 | return 0; | |
1357 | } | |
dd9dfb9f DT |
1358 | } |
1359 | ||
6eb18137 | 1360 | static bool cfg80211_bss_type_match(u16 capability, |
57fbcce3 | 1361 | enum nl80211_band band, |
6eb18137 DL |
1362 | enum ieee80211_bss_type bss_type) |
1363 | { | |
1364 | bool ret = true; | |
1365 | u16 mask, val; | |
1366 | ||
1367 | if (bss_type == IEEE80211_BSS_TYPE_ANY) | |
1368 | return ret; | |
1369 | ||
57fbcce3 | 1370 | if (band == NL80211_BAND_60GHZ) { |
6eb18137 DL |
1371 | mask = WLAN_CAPABILITY_DMG_TYPE_MASK; |
1372 | switch (bss_type) { | |
1373 | case IEEE80211_BSS_TYPE_ESS: | |
1374 | val = WLAN_CAPABILITY_DMG_TYPE_AP; | |
1375 | break; | |
1376 | case IEEE80211_BSS_TYPE_PBSS: | |
1377 | val = WLAN_CAPABILITY_DMG_TYPE_PBSS; | |
1378 | break; | |
1379 | case IEEE80211_BSS_TYPE_IBSS: | |
1380 | val = WLAN_CAPABILITY_DMG_TYPE_IBSS; | |
1381 | break; | |
1382 | default: | |
1383 | return false; | |
1384 | } | |
1385 | } else { | |
1386 | mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS; | |
1387 | switch (bss_type) { | |
1388 | case IEEE80211_BSS_TYPE_ESS: | |
1389 | val = WLAN_CAPABILITY_ESS; | |
1390 | break; | |
1391 | case IEEE80211_BSS_TYPE_IBSS: | |
1392 | val = WLAN_CAPABILITY_IBSS; | |
1393 | break; | |
1394 | case IEEE80211_BSS_TYPE_MBSS: | |
1395 | val = 0; | |
1396 | break; | |
1397 | default: | |
1398 | return false; | |
1399 | } | |
1400 | } | |
1401 | ||
1402 | ret = ((capability & mask) == val); | |
1403 | return ret; | |
1404 | } | |
1405 | ||
0e3a39b5 | 1406 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
2a519311 JB |
1407 | struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, |
1408 | struct ieee80211_channel *channel, | |
1409 | const u8 *bssid, | |
79420f09 | 1410 | const u8 *ssid, size_t ssid_len, |
6eb18137 DL |
1411 | enum ieee80211_bss_type bss_type, |
1412 | enum ieee80211_privacy privacy) | |
2a519311 | 1413 | { |
f26cbf40 | 1414 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
2a519311 | 1415 | struct cfg80211_internal_bss *bss, *res = NULL; |
ccb6c136 | 1416 | unsigned long now = jiffies; |
6eb18137 | 1417 | int bss_privacy; |
2a519311 | 1418 | |
6eb18137 DL |
1419 | trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type, |
1420 | privacy); | |
4ee3e063 | 1421 | |
1b8ec87a | 1422 | spin_lock_bh(&rdev->bss_lock); |
2a519311 | 1423 | |
1b8ec87a | 1424 | list_for_each_entry(bss, &rdev->bss_list, list) { |
6eb18137 DL |
1425 | if (!cfg80211_bss_type_match(bss->pub.capability, |
1426 | bss->pub.channel->band, bss_type)) | |
1427 | continue; | |
1428 | ||
1429 | bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY); | |
1430 | if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) || | |
1431 | (privacy == IEEE80211_PRIVACY_OFF && bss_privacy)) | |
79420f09 | 1432 | continue; |
2a519311 JB |
1433 | if (channel && bss->pub.channel != channel) |
1434 | continue; | |
c14a7400 JB |
1435 | if (!is_valid_ether_addr(bss->pub.bssid)) |
1436 | continue; | |
ccb6c136 JB |
1437 | /* Don't get expired BSS structs */ |
1438 | if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) && | |
1439 | !atomic_read(&bss->hold)) | |
1440 | continue; | |
2a519311 JB |
1441 | if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { |
1442 | res = bss; | |
1b8ec87a | 1443 | bss_ref_get(rdev, res); |
2a519311 JB |
1444 | break; |
1445 | } | |
1446 | } | |
1447 | ||
1b8ec87a | 1448 | spin_unlock_bh(&rdev->bss_lock); |
2a519311 JB |
1449 | if (!res) |
1450 | return NULL; | |
4ee3e063 | 1451 | trace_cfg80211_return_bss(&res->pub); |
2a519311 JB |
1452 | return &res->pub; |
1453 | } | |
1454 | EXPORT_SYMBOL(cfg80211_get_bss); | |
1455 | ||
1b8ec87a | 1456 | static void rb_insert_bss(struct cfg80211_registered_device *rdev, |
2a519311 JB |
1457 | struct cfg80211_internal_bss *bss) |
1458 | { | |
1b8ec87a | 1459 | struct rb_node **p = &rdev->bss_tree.rb_node; |
2a519311 JB |
1460 | struct rb_node *parent = NULL; |
1461 | struct cfg80211_internal_bss *tbss; | |
1462 | int cmp; | |
1463 | ||
1464 | while (*p) { | |
1465 | parent = *p; | |
1466 | tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); | |
1467 | ||
4593c4cb | 1468 | cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR); |
2a519311 JB |
1469 | |
1470 | if (WARN_ON(!cmp)) { | |
1471 | /* will sort of leak this BSS */ | |
1472 | return; | |
1473 | } | |
1474 | ||
1475 | if (cmp < 0) | |
1476 | p = &(*p)->rb_left; | |
1477 | else | |
1478 | p = &(*p)->rb_right; | |
1479 | } | |
1480 | ||
1481 | rb_link_node(&bss->rbn, parent, p); | |
1b8ec87a | 1482 | rb_insert_color(&bss->rbn, &rdev->bss_tree); |
2a519311 JB |
1483 | } |
1484 | ||
1485 | static struct cfg80211_internal_bss * | |
1b8ec87a | 1486 | rb_find_bss(struct cfg80211_registered_device *rdev, |
5622f5bb | 1487 | struct cfg80211_internal_bss *res, |
4593c4cb | 1488 | enum bss_compare_mode mode) |
dd9dfb9f | 1489 | { |
1b8ec87a | 1490 | struct rb_node *n = rdev->bss_tree.rb_node; |
dd9dfb9f DT |
1491 | struct cfg80211_internal_bss *bss; |
1492 | int r; | |
1493 | ||
1494 | while (n) { | |
1495 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); | |
4593c4cb | 1496 | r = cmp_bss(&res->pub, &bss->pub, mode); |
dd9dfb9f DT |
1497 | |
1498 | if (r == 0) | |
1499 | return bss; | |
1500 | else if (r < 0) | |
1501 | n = n->rb_left; | |
1502 | else | |
1503 | n = n->rb_right; | |
1504 | } | |
1505 | ||
1506 | return NULL; | |
1507 | } | |
1508 | ||
1b8ec87a | 1509 | static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev, |
776b3580 | 1510 | struct cfg80211_internal_bss *new) |
dd9dfb9f | 1511 | { |
9caf0364 | 1512 | const struct cfg80211_bss_ies *ies; |
776b3580 JB |
1513 | struct cfg80211_internal_bss *bss; |
1514 | const u8 *ie; | |
1515 | int i, ssidlen; | |
1516 | u8 fold = 0; | |
9853a55e | 1517 | u32 n_entries = 0; |
9caf0364 | 1518 | |
776b3580 | 1519 | ies = rcu_access_pointer(new->pub.beacon_ies); |
9caf0364 | 1520 | if (WARN_ON(!ies)) |
776b3580 | 1521 | return false; |
dd9dfb9f | 1522 | |
776b3580 JB |
1523 | ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); |
1524 | if (!ie) { | |
1525 | /* nothing to do */ | |
1526 | return true; | |
1527 | } | |
1528 | ||
1529 | ssidlen = ie[1]; | |
1530 | for (i = 0; i < ssidlen; i++) | |
1531 | fold |= ie[2 + i]; | |
1532 | ||
1533 | if (fold) { | |
1534 | /* not a hidden SSID */ | |
1535 | return true; | |
1536 | } | |
1537 | ||
1538 | /* This is the bad part ... */ | |
1539 | ||
1b8ec87a | 1540 | list_for_each_entry(bss, &rdev->bss_list, list) { |
9853a55e JB |
1541 | /* |
1542 | * we're iterating all the entries anyway, so take the | |
1543 | * opportunity to validate the list length accounting | |
1544 | */ | |
1545 | n_entries++; | |
1546 | ||
776b3580 JB |
1547 | if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid)) |
1548 | continue; | |
1549 | if (bss->pub.channel != new->pub.channel) | |
1550 | continue; | |
dcd6eac1 SW |
1551 | if (bss->pub.scan_width != new->pub.scan_width) |
1552 | continue; | |
776b3580 JB |
1553 | if (rcu_access_pointer(bss->pub.beacon_ies)) |
1554 | continue; | |
1555 | ies = rcu_access_pointer(bss->pub.ies); | |
1556 | if (!ies) | |
1557 | continue; | |
1558 | ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); | |
1559 | if (!ie) | |
1560 | continue; | |
1561 | if (ssidlen && ie[1] != ssidlen) | |
1562 | continue; | |
776b3580 JB |
1563 | if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss)) |
1564 | continue; | |
1565 | if (WARN_ON_ONCE(!list_empty(&bss->hidden_list))) | |
1566 | list_del(&bss->hidden_list); | |
1567 | /* combine them */ | |
1568 | list_add(&bss->hidden_list, &new->hidden_list); | |
1569 | bss->pub.hidden_beacon_bss = &new->pub; | |
1570 | new->refcount += bss->refcount; | |
1571 | rcu_assign_pointer(bss->pub.beacon_ies, | |
1572 | new->pub.beacon_ies); | |
1573 | } | |
1574 | ||
9853a55e JB |
1575 | WARN_ONCE(n_entries != rdev->bss_entries, |
1576 | "rdev bss entries[%d]/list[len:%d] corruption\n", | |
1577 | rdev->bss_entries, n_entries); | |
1578 | ||
776b3580 | 1579 | return true; |
dd9dfb9f DT |
1580 | } |
1581 | ||
0cd01efb SS |
1582 | struct cfg80211_non_tx_bss { |
1583 | struct cfg80211_bss *tx_bss; | |
1584 | u8 max_bssid_indicator; | |
1585 | u8 bssid_index; | |
1586 | }; | |
1587 | ||
3ab8227d SM |
1588 | static bool |
1589 | cfg80211_update_known_bss(struct cfg80211_registered_device *rdev, | |
1590 | struct cfg80211_internal_bss *known, | |
1591 | struct cfg80211_internal_bss *new, | |
1592 | bool signal_valid) | |
1593 | { | |
1594 | lockdep_assert_held(&rdev->bss_lock); | |
1595 | ||
1596 | /* Update IEs */ | |
1597 | if (rcu_access_pointer(new->pub.proberesp_ies)) { | |
1598 | const struct cfg80211_bss_ies *old; | |
1599 | ||
1600 | old = rcu_access_pointer(known->pub.proberesp_ies); | |
1601 | ||
1602 | rcu_assign_pointer(known->pub.proberesp_ies, | |
1603 | new->pub.proberesp_ies); | |
1604 | /* Override possible earlier Beacon frame IEs */ | |
1605 | rcu_assign_pointer(known->pub.ies, | |
1606 | new->pub.proberesp_ies); | |
1607 | if (old) | |
1608 | kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head); | |
1609 | } else if (rcu_access_pointer(new->pub.beacon_ies)) { | |
1610 | const struct cfg80211_bss_ies *old; | |
1611 | struct cfg80211_internal_bss *bss; | |
1612 | ||
1613 | if (known->pub.hidden_beacon_bss && | |
1614 | !list_empty(&known->hidden_list)) { | |
1615 | const struct cfg80211_bss_ies *f; | |
1616 | ||
1617 | /* The known BSS struct is one of the probe | |
1618 | * response members of a group, but we're | |
1619 | * receiving a beacon (beacon_ies in the new | |
1620 | * bss is used). This can only mean that the | |
1621 | * AP changed its beacon from not having an | |
1622 | * SSID to showing it, which is confusing so | |
1623 | * drop this information. | |
1624 | */ | |
1625 | ||
1626 | f = rcu_access_pointer(new->pub.beacon_ies); | |
1627 | kfree_rcu((struct cfg80211_bss_ies *)f, rcu_head); | |
1628 | return false; | |
1629 | } | |
1630 | ||
1631 | old = rcu_access_pointer(known->pub.beacon_ies); | |
1632 | ||
1633 | rcu_assign_pointer(known->pub.beacon_ies, new->pub.beacon_ies); | |
1634 | ||
1635 | /* Override IEs if they were from a beacon before */ | |
1636 | if (old == rcu_access_pointer(known->pub.ies)) | |
1637 | rcu_assign_pointer(known->pub.ies, new->pub.beacon_ies); | |
1638 | ||
1639 | /* Assign beacon IEs to all sub entries */ | |
1640 | list_for_each_entry(bss, &known->hidden_list, hidden_list) { | |
1641 | const struct cfg80211_bss_ies *ies; | |
1642 | ||
1643 | ies = rcu_access_pointer(bss->pub.beacon_ies); | |
1644 | WARN_ON(ies != old); | |
1645 | ||
1646 | rcu_assign_pointer(bss->pub.beacon_ies, | |
1647 | new->pub.beacon_ies); | |
1648 | } | |
1649 | ||
1650 | if (old) | |
1651 | kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head); | |
1652 | } | |
1653 | ||
1654 | known->pub.beacon_interval = new->pub.beacon_interval; | |
1655 | ||
1656 | /* don't update the signal if beacon was heard on | |
1657 | * adjacent channel. | |
1658 | */ | |
1659 | if (signal_valid) | |
1660 | known->pub.signal = new->pub.signal; | |
1661 | known->pub.capability = new->pub.capability; | |
1662 | known->ts = new->ts; | |
1663 | known->ts_boottime = new->ts_boottime; | |
1664 | known->parent_tsf = new->parent_tsf; | |
1665 | known->pub.chains = new->pub.chains; | |
1666 | memcpy(known->pub.chain_signal, new->pub.chain_signal, | |
1667 | IEEE80211_MAX_CHAINS); | |
1668 | ether_addr_copy(known->parent_bssid, new->parent_bssid); | |
1669 | known->pub.max_bssid_indicator = new->pub.max_bssid_indicator; | |
1670 | known->pub.bssid_index = new->pub.bssid_index; | |
1671 | ||
1672 | return true; | |
1673 | } | |
1674 | ||
0e3a39b5 | 1675 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
a3ce17d1 | 1676 | struct cfg80211_internal_bss * |
1b8ec87a | 1677 | cfg80211_bss_update(struct cfg80211_registered_device *rdev, |
3afc2167 | 1678 | struct cfg80211_internal_bss *tmp, |
a3ce17d1 | 1679 | bool signal_valid, unsigned long ts) |
2a519311 JB |
1680 | { |
1681 | struct cfg80211_internal_bss *found = NULL; | |
2a519311 | 1682 | |
9caf0364 | 1683 | if (WARN_ON(!tmp->pub.channel)) |
2a519311 | 1684 | return NULL; |
2a519311 | 1685 | |
a3ce17d1 | 1686 | tmp->ts = ts; |
2a519311 | 1687 | |
1b8ec87a | 1688 | spin_lock_bh(&rdev->bss_lock); |
2a519311 | 1689 | |
9caf0364 | 1690 | if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) { |
1b8ec87a | 1691 | spin_unlock_bh(&rdev->bss_lock); |
9caf0364 JB |
1692 | return NULL; |
1693 | } | |
1694 | ||
1b8ec87a | 1695 | found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR); |
2a519311 | 1696 | |
cd1658f5 | 1697 | if (found) { |
3ab8227d SM |
1698 | if (!cfg80211_update_known_bss(rdev, found, tmp, signal_valid)) |
1699 | goto drop; | |
2a519311 | 1700 | } else { |
9caf0364 | 1701 | struct cfg80211_internal_bss *new; |
dd9dfb9f | 1702 | struct cfg80211_internal_bss *hidden; |
9caf0364 | 1703 | struct cfg80211_bss_ies *ies; |
dd9dfb9f | 1704 | |
9caf0364 JB |
1705 | /* |
1706 | * create a copy -- the "res" variable that is passed in | |
1707 | * is allocated on the stack since it's not needed in the | |
1708 | * more common case of an update | |
1709 | */ | |
1b8ec87a | 1710 | new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size, |
9caf0364 JB |
1711 | GFP_ATOMIC); |
1712 | if (!new) { | |
1713 | ies = (void *)rcu_dereference(tmp->pub.beacon_ies); | |
1714 | if (ies) | |
1715 | kfree_rcu(ies, rcu_head); | |
1716 | ies = (void *)rcu_dereference(tmp->pub.proberesp_ies); | |
1717 | if (ies) | |
1718 | kfree_rcu(ies, rcu_head); | |
776b3580 | 1719 | goto drop; |
9caf0364 JB |
1720 | } |
1721 | memcpy(new, tmp, sizeof(*new)); | |
776b3580 JB |
1722 | new->refcount = 1; |
1723 | INIT_LIST_HEAD(&new->hidden_list); | |
7011ba58 | 1724 | INIT_LIST_HEAD(&new->pub.nontrans_list); |
776b3580 JB |
1725 | |
1726 | if (rcu_access_pointer(tmp->pub.proberesp_ies)) { | |
1b8ec87a | 1727 | hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN); |
776b3580 | 1728 | if (!hidden) |
1b8ec87a | 1729 | hidden = rb_find_bss(rdev, tmp, |
776b3580 JB |
1730 | BSS_CMP_HIDE_NUL); |
1731 | if (hidden) { | |
1732 | new->pub.hidden_beacon_bss = &hidden->pub; | |
1733 | list_add(&new->hidden_list, | |
1734 | &hidden->hidden_list); | |
1735 | hidden->refcount++; | |
1736 | rcu_assign_pointer(new->pub.beacon_ies, | |
1737 | hidden->pub.beacon_ies); | |
1738 | } | |
1739 | } else { | |
1740 | /* | |
1741 | * Ok so we found a beacon, and don't have an entry. If | |
1742 | * it's a beacon with hidden SSID, we might be in for an | |
1743 | * expensive search for any probe responses that should | |
1744 | * be grouped with this beacon for updates ... | |
1745 | */ | |
1b8ec87a | 1746 | if (!cfg80211_combine_bsses(rdev, new)) { |
776b3580 JB |
1747 | kfree(new); |
1748 | goto drop; | |
1749 | } | |
1750 | } | |
1751 | ||
9853a55e JB |
1752 | if (rdev->bss_entries >= bss_entries_limit && |
1753 | !cfg80211_bss_expire_oldest(rdev)) { | |
010bfbe7 JB |
1754 | if (!list_empty(&new->hidden_list)) |
1755 | list_del(&new->hidden_list); | |
9853a55e JB |
1756 | kfree(new); |
1757 | goto drop; | |
1758 | } | |
1759 | ||
a3584f56 | 1760 | /* This must be before the call to bss_ref_get */ |
0cd01efb | 1761 | if (tmp->pub.transmitted_bss) { |
a3584f56 | 1762 | struct cfg80211_internal_bss *pbss = |
0cd01efb | 1763 | container_of(tmp->pub.transmitted_bss, |
a3584f56 SS |
1764 | struct cfg80211_internal_bss, |
1765 | pub); | |
1766 | ||
0cd01efb | 1767 | new->pub.transmitted_bss = tmp->pub.transmitted_bss; |
a3584f56 SS |
1768 | bss_ref_get(rdev, pbss); |
1769 | } | |
1770 | ||
1b8ec87a | 1771 | list_add_tail(&new->list, &rdev->bss_list); |
9853a55e | 1772 | rdev->bss_entries++; |
1b8ec87a | 1773 | rb_insert_bss(rdev, new); |
9caf0364 | 1774 | found = new; |
2a519311 JB |
1775 | } |
1776 | ||
1b8ec87a ZG |
1777 | rdev->bss_generation++; |
1778 | bss_ref_get(rdev, found); | |
1779 | spin_unlock_bh(&rdev->bss_lock); | |
2a519311 | 1780 | |
2a519311 | 1781 | return found; |
776b3580 | 1782 | drop: |
1b8ec87a | 1783 | spin_unlock_bh(&rdev->bss_lock); |
776b3580 | 1784 | return NULL; |
2a519311 JB |
1785 | } |
1786 | ||
119f94a6 JM |
1787 | /* |
1788 | * Update RX channel information based on the available frame payload | |
1789 | * information. This is mainly for the 2.4 GHz band where frames can be received | |
1790 | * from neighboring channels and the Beacon frames use the DSSS Parameter Set | |
1791 | * element to indicate the current (transmitting) channel, but this might also | |
1792 | * be needed on other bands if RX frequency does not match with the actual | |
1793 | * operating channel of a BSS. | |
1794 | */ | |
0172bb75 JB |
1795 | static struct ieee80211_channel * |
1796 | cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen, | |
119f94a6 JM |
1797 | struct ieee80211_channel *channel, |
1798 | enum nl80211_bss_scan_width scan_width) | |
0172bb75 JB |
1799 | { |
1800 | const u8 *tmp; | |
1801 | u32 freq; | |
1802 | int channel_number = -1; | |
119f94a6 | 1803 | struct ieee80211_channel *alt_channel; |
0172bb75 | 1804 | |
66b0564d TP |
1805 | if (channel->band == NL80211_BAND_S1GHZ) { |
1806 | tmp = cfg80211_find_ie(WLAN_EID_S1G_OPERATION, ie, ielen); | |
1807 | if (tmp && tmp[1] >= sizeof(struct ieee80211_s1g_oper_ie)) { | |
1808 | struct ieee80211_s1g_oper_ie *s1gop = (void *)(tmp + 2); | |
1809 | ||
1810 | channel_number = s1gop->primary_ch; | |
1811 | } | |
0172bb75 | 1812 | } else { |
66b0564d TP |
1813 | tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen); |
1814 | if (tmp && tmp[1] == 1) { | |
1815 | channel_number = tmp[2]; | |
1816 | } else { | |
1817 | tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen); | |
1818 | if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) { | |
1819 | struct ieee80211_ht_operation *htop = (void *)(tmp + 2); | |
0172bb75 | 1820 | |
66b0564d TP |
1821 | channel_number = htop->primary_chan; |
1822 | } | |
0172bb75 JB |
1823 | } |
1824 | } | |
1825 | ||
119f94a6 JM |
1826 | if (channel_number < 0) { |
1827 | /* No channel information in frame payload */ | |
0172bb75 | 1828 | return channel; |
119f94a6 | 1829 | } |
0172bb75 | 1830 | |
934f4c7d TP |
1831 | freq = ieee80211_channel_to_freq_khz(channel_number, channel->band); |
1832 | alt_channel = ieee80211_get_channel_khz(wiphy, freq); | |
119f94a6 JM |
1833 | if (!alt_channel) { |
1834 | if (channel->band == NL80211_BAND_2GHZ) { | |
1835 | /* | |
1836 | * Better not allow unexpected channels when that could | |
1837 | * be going beyond the 1-11 range (e.g., discovering | |
1838 | * BSS on channel 12 when radio is configured for | |
1839 | * channel 11. | |
1840 | */ | |
1841 | return NULL; | |
1842 | } | |
1843 | ||
1844 | /* No match for the payload channel number - ignore it */ | |
1845 | return channel; | |
1846 | } | |
1847 | ||
1848 | if (scan_width == NL80211_BSS_CHAN_WIDTH_10 || | |
1849 | scan_width == NL80211_BSS_CHAN_WIDTH_5) { | |
1850 | /* | |
1851 | * Ignore channel number in 5 and 10 MHz channels where there | |
1852 | * may not be an n:1 or 1:n mapping between frequencies and | |
1853 | * channel numbers. | |
1854 | */ | |
1855 | return channel; | |
1856 | } | |
1857 | ||
1858 | /* | |
1859 | * Use the channel determined through the payload channel number | |
1860 | * instead of the RX channel reported by the driver. | |
1861 | */ | |
1862 | if (alt_channel->flags & IEEE80211_CHAN_DISABLED) | |
0172bb75 | 1863 | return NULL; |
119f94a6 | 1864 | return alt_channel; |
0172bb75 JB |
1865 | } |
1866 | ||
0e3a39b5 | 1867 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
0b8fb823 PX |
1868 | static struct cfg80211_bss * |
1869 | cfg80211_inform_single_bss_data(struct wiphy *wiphy, | |
1870 | struct cfg80211_inform_bss *data, | |
1871 | enum cfg80211_bss_frame_type ftype, | |
1872 | const u8 *bssid, u64 tsf, u16 capability, | |
1873 | u16 beacon_interval, const u8 *ie, size_t ielen, | |
0cd01efb | 1874 | struct cfg80211_non_tx_bss *non_tx_data, |
0b8fb823 | 1875 | gfp_t gfp) |
06aa7afa | 1876 | { |
0b8fb823 | 1877 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
9caf0364 | 1878 | struct cfg80211_bss_ies *ies; |
3afc2167 | 1879 | struct ieee80211_channel *channel; |
7011ba58 | 1880 | struct cfg80211_internal_bss tmp = {}, *res; |
6eb18137 | 1881 | int bss_type; |
67af9811 | 1882 | bool signal_valid; |
60d7dfea | 1883 | unsigned long ts; |
06aa7afa JK |
1884 | |
1885 | if (WARN_ON(!wiphy)) | |
1886 | return NULL; | |
1887 | ||
22fe88d3 | 1888 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
6e19bc4b | 1889 | (data->signal < 0 || data->signal > 100))) |
06aa7afa JK |
1890 | return NULL; |
1891 | ||
119f94a6 JM |
1892 | channel = cfg80211_get_bss_channel(wiphy, ie, ielen, data->chan, |
1893 | data->scan_width); | |
0172bb75 JB |
1894 | if (!channel) |
1895 | return NULL; | |
1896 | ||
9caf0364 JB |
1897 | memcpy(tmp.pub.bssid, bssid, ETH_ALEN); |
1898 | tmp.pub.channel = channel; | |
6e19bc4b DS |
1899 | tmp.pub.scan_width = data->scan_width; |
1900 | tmp.pub.signal = data->signal; | |
9caf0364 JB |
1901 | tmp.pub.beacon_interval = beacon_interval; |
1902 | tmp.pub.capability = capability; | |
6e19bc4b | 1903 | tmp.ts_boottime = data->boottime_ns; |
b45a19dd IP |
1904 | tmp.parent_tsf = data->parent_tsf; |
1905 | ether_addr_copy(tmp.parent_bssid, data->parent_bssid); | |
1906 | ||
0cd01efb SS |
1907 | if (non_tx_data) { |
1908 | tmp.pub.transmitted_bss = non_tx_data->tx_bss; | |
60d7dfea | 1909 | ts = bss_from_pub(non_tx_data->tx_bss)->ts; |
0cd01efb SS |
1910 | tmp.pub.bssid_index = non_tx_data->bssid_index; |
1911 | tmp.pub.max_bssid_indicator = non_tx_data->max_bssid_indicator; | |
60d7dfea JB |
1912 | } else { |
1913 | ts = jiffies; | |
0cd01efb | 1914 | } |
6e19bc4b | 1915 | |
34a6eddb | 1916 | /* |
5bc8c1f2 | 1917 | * If we do not know here whether the IEs are from a Beacon or Probe |
34a6eddb JM |
1918 | * Response frame, we need to pick one of the options and only use it |
1919 | * with the driver that does not provide the full Beacon/Probe Response | |
1920 | * frame. Use Beacon frame pointer to avoid indicating that this should | |
50521aa8 | 1921 | * override the IEs pointer should we have received an earlier |
9caf0364 | 1922 | * indication of Probe Response data. |
34a6eddb | 1923 | */ |
0e227084 | 1924 | ies = kzalloc(sizeof(*ies) + ielen, gfp); |
9caf0364 JB |
1925 | if (!ies) |
1926 | return NULL; | |
1927 | ies->len = ielen; | |
8cef2c9d | 1928 | ies->tsf = tsf; |
0e227084 | 1929 | ies->from_beacon = false; |
9caf0364 | 1930 | memcpy(ies->data, ie, ielen); |
06aa7afa | 1931 | |
5bc8c1f2 JB |
1932 | switch (ftype) { |
1933 | case CFG80211_BSS_FTYPE_BEACON: | |
1934 | ies->from_beacon = true; | |
7b506ff6 | 1935 | fallthrough; |
5bc8c1f2 JB |
1936 | case CFG80211_BSS_FTYPE_UNKNOWN: |
1937 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); | |
1938 | break; | |
1939 | case CFG80211_BSS_FTYPE_PRESP: | |
1940 | rcu_assign_pointer(tmp.pub.proberesp_ies, ies); | |
1941 | break; | |
1942 | } | |
9caf0364 | 1943 | rcu_assign_pointer(tmp.pub.ies, ies); |
06aa7afa | 1944 | |
7bb106eb | 1945 | signal_valid = data->chan == channel; |
60d7dfea | 1946 | res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid, ts); |
06aa7afa JK |
1947 | if (!res) |
1948 | return NULL; | |
1949 | ||
57fbcce3 | 1950 | if (channel->band == NL80211_BAND_60GHZ) { |
6eb18137 DL |
1951 | bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK; |
1952 | if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP || | |
1953 | bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS) | |
1954 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
1955 | } else { | |
1956 | if (res->pub.capability & WLAN_CAPABILITY_ESS) | |
1957 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
1958 | } | |
06aa7afa | 1959 | |
b0d1d7ff | 1960 | if (non_tx_data) { |
0b8fb823 PX |
1961 | /* this is a nontransmitting bss, we need to add it to |
1962 | * transmitting bss' list if it is not there | |
1963 | */ | |
0cd01efb SS |
1964 | if (cfg80211_add_nontrans_list(non_tx_data->tx_bss, |
1965 | &res->pub)) { | |
0b8fb823 PX |
1966 | if (__cfg80211_unlink_bss(rdev, res)) |
1967 | rdev->bss_generation++; | |
1968 | } | |
1969 | } | |
1970 | ||
4ee3e063 | 1971 | trace_cfg80211_return_bss(&res->pub); |
06aa7afa JK |
1972 | /* cfg80211_bss_update gives us a referenced result */ |
1973 | return &res->pub; | |
1974 | } | |
06aa7afa | 1975 | |
fe806e49 SS |
1976 | static const struct element |
1977 | *cfg80211_get_profile_continuation(const u8 *ie, size_t ielen, | |
1978 | const struct element *mbssid_elem, | |
1979 | const struct element *sub_elem) | |
1980 | { | |
1981 | const u8 *mbssid_end = mbssid_elem->data + mbssid_elem->datalen; | |
1982 | const struct element *next_mbssid; | |
1983 | const struct element *next_sub; | |
1984 | ||
1985 | next_mbssid = cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID, | |
1986 | mbssid_end, | |
1987 | ielen - (mbssid_end - ie)); | |
1988 | ||
1989 | /* | |
8cf5c86d | 1990 | * If it is not the last subelement in current MBSSID IE or there isn't |
fe806e49 SS |
1991 | * a next MBSSID IE - profile is complete. |
1992 | */ | |
1993 | if ((sub_elem->data + sub_elem->datalen < mbssid_end - 1) || | |
1994 | !next_mbssid) | |
1995 | return NULL; | |
1996 | ||
1997 | /* For any length error, just return NULL */ | |
1998 | ||
1999 | if (next_mbssid->datalen < 4) | |
2000 | return NULL; | |
2001 | ||
2002 | next_sub = (void *)&next_mbssid->data[1]; | |
2003 | ||
2004 | if (next_mbssid->data + next_mbssid->datalen < | |
2005 | next_sub->data + next_sub->datalen) | |
2006 | return NULL; | |
2007 | ||
2008 | if (next_sub->id != 0 || next_sub->datalen < 2) | |
2009 | return NULL; | |
2010 | ||
2011 | /* | |
2012 | * Check if the first element in the next sub element is a start | |
2013 | * of a new profile | |
2014 | */ | |
2015 | return next_sub->data[0] == WLAN_EID_NON_TX_BSSID_CAP ? | |
2016 | NULL : next_mbssid; | |
2017 | } | |
2018 | ||
2019 | size_t cfg80211_merge_profile(const u8 *ie, size_t ielen, | |
2020 | const struct element *mbssid_elem, | |
2021 | const struct element *sub_elem, | |
5809a5d5 | 2022 | u8 *merged_ie, size_t max_copy_len) |
fe806e49 SS |
2023 | { |
2024 | size_t copied_len = sub_elem->datalen; | |
2025 | const struct element *next_mbssid; | |
2026 | ||
2027 | if (sub_elem->datalen > max_copy_len) | |
2028 | return 0; | |
2029 | ||
5809a5d5 | 2030 | memcpy(merged_ie, sub_elem->data, sub_elem->datalen); |
fe806e49 SS |
2031 | |
2032 | while ((next_mbssid = cfg80211_get_profile_continuation(ie, ielen, | |
2033 | mbssid_elem, | |
2034 | sub_elem))) { | |
2035 | const struct element *next_sub = (void *)&next_mbssid->data[1]; | |
2036 | ||
2037 | if (copied_len + next_sub->datalen > max_copy_len) | |
2038 | break; | |
5809a5d5 | 2039 | memcpy(merged_ie + copied_len, next_sub->data, |
fe806e49 SS |
2040 | next_sub->datalen); |
2041 | copied_len += next_sub->datalen; | |
2042 | } | |
2043 | ||
2044 | return copied_len; | |
2045 | } | |
2046 | EXPORT_SYMBOL(cfg80211_merge_profile); | |
2047 | ||
0b8fb823 PX |
2048 | static void cfg80211_parse_mbssid_data(struct wiphy *wiphy, |
2049 | struct cfg80211_inform_bss *data, | |
2050 | enum cfg80211_bss_frame_type ftype, | |
2051 | const u8 *bssid, u64 tsf, | |
2052 | u16 beacon_interval, const u8 *ie, | |
2053 | size_t ielen, | |
0cd01efb | 2054 | struct cfg80211_non_tx_bss *non_tx_data, |
0b8fb823 PX |
2055 | gfp_t gfp) |
2056 | { | |
1c8745f3 JB |
2057 | const u8 *mbssid_index_ie; |
2058 | const struct element *elem, *sub; | |
2059 | size_t new_ie_len; | |
0b8fb823 | 2060 | u8 new_bssid[ETH_ALEN]; |
fe806e49 SS |
2061 | u8 *new_ie, *profile; |
2062 | u64 seen_indices = 0; | |
0b8fb823 PX |
2063 | u16 capability; |
2064 | struct cfg80211_bss *bss; | |
2065 | ||
0cd01efb | 2066 | if (!non_tx_data) |
0b8fb823 PX |
2067 | return; |
2068 | if (!cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen)) | |
2069 | return; | |
213ed579 SS |
2070 | if (!wiphy->support_mbssid) |
2071 | return; | |
2072 | if (wiphy->support_only_he_mbssid && | |
2073 | !cfg80211_find_ext_ie(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen)) | |
2074 | return; | |
0b8fb823 | 2075 | |
0b8fb823 PX |
2076 | new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp); |
2077 | if (!new_ie) | |
2078 | return; | |
2079 | ||
fe806e49 SS |
2080 | profile = kmalloc(ielen, gfp); |
2081 | if (!profile) | |
2082 | goto out; | |
2083 | ||
1c8745f3 JB |
2084 | for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, ie, ielen) { |
2085 | if (elem->datalen < 4) | |
2086 | continue; | |
2087 | for_each_element(sub, elem->data + 1, elem->datalen - 1) { | |
fe806e49 SS |
2088 | u8 profile_len; |
2089 | ||
1c8745f3 | 2090 | if (sub->id != 0 || sub->datalen < 4) { |
0b8fb823 PX |
2091 | /* not a valid BSS profile */ |
2092 | continue; | |
2093 | } | |
2094 | ||
1c8745f3 JB |
2095 | if (sub->data[0] != WLAN_EID_NON_TX_BSSID_CAP || |
2096 | sub->data[1] != 2) { | |
0b8fb823 PX |
2097 | /* The first element within the Nontransmitted |
2098 | * BSSID Profile is not the Nontransmitted | |
2099 | * BSSID Capability element. | |
2100 | */ | |
2101 | continue; | |
2102 | } | |
2103 | ||
fe806e49 SS |
2104 | memset(profile, 0, ielen); |
2105 | profile_len = cfg80211_merge_profile(ie, ielen, | |
2106 | elem, | |
2107 | sub, | |
5809a5d5 | 2108 | profile, |
fe806e49 SS |
2109 | ielen); |
2110 | ||
0b8fb823 PX |
2111 | /* found a Nontransmitted BSSID Profile */ |
2112 | mbssid_index_ie = cfg80211_find_ie | |
2113 | (WLAN_EID_MULTI_BSSID_IDX, | |
fe806e49 | 2114 | profile, profile_len); |
0b8fb823 | 2115 | if (!mbssid_index_ie || mbssid_index_ie[1] < 1 || |
fe806e49 SS |
2116 | mbssid_index_ie[2] == 0 || |
2117 | mbssid_index_ie[2] > 46) { | |
0b8fb823 PX |
2118 | /* No valid Multiple BSSID-Index element */ |
2119 | continue; | |
2120 | } | |
2121 | ||
ebb3ca3b | 2122 | if (seen_indices & BIT_ULL(mbssid_index_ie[2])) |
fe806e49 SS |
2123 | /* We don't support legacy split of a profile */ |
2124 | net_dbg_ratelimited("Partial info for BSSID index %d\n", | |
2125 | mbssid_index_ie[2]); | |
2126 | ||
ebb3ca3b | 2127 | seen_indices |= BIT_ULL(mbssid_index_ie[2]); |
fe806e49 | 2128 | |
0cd01efb SS |
2129 | non_tx_data->bssid_index = mbssid_index_ie[2]; |
2130 | non_tx_data->max_bssid_indicator = elem->data[0]; | |
2131 | ||
2132 | cfg80211_gen_new_bssid(bssid, | |
2133 | non_tx_data->max_bssid_indicator, | |
2134 | non_tx_data->bssid_index, | |
0b8fb823 PX |
2135 | new_bssid); |
2136 | memset(new_ie, 0, IEEE80211_MAX_DATA_LEN); | |
fe806e49 SS |
2137 | new_ie_len = cfg80211_gen_new_ie(ie, ielen, |
2138 | profile, | |
2139 | profile_len, new_ie, | |
0b8fb823 PX |
2140 | gfp); |
2141 | if (!new_ie_len) | |
2142 | continue; | |
2143 | ||
fe806e49 | 2144 | capability = get_unaligned_le16(profile + 2); |
0b8fb823 PX |
2145 | bss = cfg80211_inform_single_bss_data(wiphy, data, |
2146 | ftype, | |
2147 | new_bssid, tsf, | |
2148 | capability, | |
2149 | beacon_interval, | |
2150 | new_ie, | |
2151 | new_ie_len, | |
0cd01efb SS |
2152 | non_tx_data, |
2153 | gfp); | |
0b8fb823 PX |
2154 | if (!bss) |
2155 | break; | |
2156 | cfg80211_put_bss(wiphy, bss); | |
2157 | } | |
0b8fb823 PX |
2158 | } |
2159 | ||
fe806e49 | 2160 | out: |
0b8fb823 | 2161 | kfree(new_ie); |
fe806e49 | 2162 | kfree(profile); |
0b8fb823 PX |
2163 | } |
2164 | ||
2a519311 | 2165 | struct cfg80211_bss * |
0b8fb823 PX |
2166 | cfg80211_inform_bss_data(struct wiphy *wiphy, |
2167 | struct cfg80211_inform_bss *data, | |
2168 | enum cfg80211_bss_frame_type ftype, | |
2169 | const u8 *bssid, u64 tsf, u16 capability, | |
2170 | u16 beacon_interval, const u8 *ie, size_t ielen, | |
2171 | gfp_t gfp) | |
2172 | { | |
2173 | struct cfg80211_bss *res; | |
0cd01efb | 2174 | struct cfg80211_non_tx_bss non_tx_data; |
0b8fb823 PX |
2175 | |
2176 | res = cfg80211_inform_single_bss_data(wiphy, data, ftype, bssid, tsf, | |
2177 | capability, beacon_interval, ie, | |
2178 | ielen, NULL, gfp); | |
b0d1d7ff JB |
2179 | if (!res) |
2180 | return NULL; | |
0cd01efb | 2181 | non_tx_data.tx_bss = res; |
0b8fb823 | 2182 | cfg80211_parse_mbssid_data(wiphy, data, ftype, bssid, tsf, |
0cd01efb SS |
2183 | beacon_interval, ie, ielen, &non_tx_data, |
2184 | gfp); | |
0b8fb823 PX |
2185 | return res; |
2186 | } | |
2187 | EXPORT_SYMBOL(cfg80211_inform_bss_data); | |
2188 | ||
2189 | static void | |
2190 | cfg80211_parse_mbssid_frame_data(struct wiphy *wiphy, | |
2191 | struct cfg80211_inform_bss *data, | |
2192 | struct ieee80211_mgmt *mgmt, size_t len, | |
0cd01efb | 2193 | struct cfg80211_non_tx_bss *non_tx_data, |
0b8fb823 PX |
2194 | gfp_t gfp) |
2195 | { | |
2196 | enum cfg80211_bss_frame_type ftype; | |
2197 | const u8 *ie = mgmt->u.probe_resp.variable; | |
2198 | size_t ielen = len - offsetof(struct ieee80211_mgmt, | |
2199 | u.probe_resp.variable); | |
2200 | ||
2201 | ftype = ieee80211_is_beacon(mgmt->frame_control) ? | |
2202 | CFG80211_BSS_FTYPE_BEACON : CFG80211_BSS_FTYPE_PRESP; | |
2203 | ||
2204 | cfg80211_parse_mbssid_data(wiphy, data, ftype, mgmt->bssid, | |
2205 | le64_to_cpu(mgmt->u.probe_resp.timestamp), | |
2206 | le16_to_cpu(mgmt->u.probe_resp.beacon_int), | |
0cd01efb | 2207 | ie, ielen, non_tx_data, gfp); |
0b8fb823 PX |
2208 | } |
2209 | ||
2210 | static void | |
2211 | cfg80211_update_notlisted_nontrans(struct wiphy *wiphy, | |
7011ba58 | 2212 | struct cfg80211_bss *nontrans_bss, |
461c4c2b | 2213 | struct ieee80211_mgmt *mgmt, size_t len) |
0b8fb823 PX |
2214 | { |
2215 | u8 *ie, *new_ie, *pos; | |
2216 | const u8 *nontrans_ssid, *trans_ssid, *mbssid; | |
2217 | size_t ielen = len - offsetof(struct ieee80211_mgmt, | |
2218 | u.probe_resp.variable); | |
2219 | size_t new_ie_len; | |
2220 | struct cfg80211_bss_ies *new_ies; | |
2221 | const struct cfg80211_bss_ies *old; | |
2222 | u8 cpy_len; | |
2223 | ||
461c4c2b SS |
2224 | lockdep_assert_held(&wiphy_to_rdev(wiphy)->bss_lock); |
2225 | ||
0b8fb823 PX |
2226 | ie = mgmt->u.probe_resp.variable; |
2227 | ||
2228 | new_ie_len = ielen; | |
2229 | trans_ssid = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen); | |
2230 | if (!trans_ssid) | |
2231 | return; | |
2232 | new_ie_len -= trans_ssid[1]; | |
2233 | mbssid = cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen); | |
242b0931 JB |
2234 | /* |
2235 | * It's not valid to have the MBSSID element before SSID | |
2236 | * ignore if that happens - the code below assumes it is | |
2237 | * after (while copying things inbetween). | |
2238 | */ | |
2239 | if (!mbssid || mbssid < trans_ssid) | |
0b8fb823 PX |
2240 | return; |
2241 | new_ie_len -= mbssid[1]; | |
461c4c2b | 2242 | |
7011ba58 | 2243 | nontrans_ssid = ieee80211_bss_get_ie(nontrans_bss, WLAN_EID_SSID); |
461c4c2b | 2244 | if (!nontrans_ssid) |
0b8fb823 | 2245 | return; |
461c4c2b | 2246 | |
0b8fb823 | 2247 | new_ie_len += nontrans_ssid[1]; |
0b8fb823 PX |
2248 | |
2249 | /* generate new ie for nontrans BSS | |
2250 | * 1. replace SSID with nontrans BSS' SSID | |
2251 | * 2. skip MBSSID IE | |
2252 | */ | |
461c4c2b | 2253 | new_ie = kzalloc(new_ie_len, GFP_ATOMIC); |
0b8fb823 PX |
2254 | if (!new_ie) |
2255 | return; | |
461c4c2b SS |
2256 | |
2257 | new_ies = kzalloc(sizeof(*new_ies) + new_ie_len, GFP_ATOMIC); | |
bede8d29 SS |
2258 | if (!new_ies) |
2259 | goto out_free; | |
0b8fb823 PX |
2260 | |
2261 | pos = new_ie; | |
2262 | ||
2263 | /* copy the nontransmitted SSID */ | |
2264 | cpy_len = nontrans_ssid[1] + 2; | |
2265 | memcpy(pos, nontrans_ssid, cpy_len); | |
2266 | pos += cpy_len; | |
2267 | /* copy the IEs between SSID and MBSSID */ | |
2268 | cpy_len = trans_ssid[1] + 2; | |
2269 | memcpy(pos, (trans_ssid + cpy_len), (mbssid - (trans_ssid + cpy_len))); | |
2270 | pos += (mbssid - (trans_ssid + cpy_len)); | |
2271 | /* copy the IEs after MBSSID */ | |
2272 | cpy_len = mbssid[1] + 2; | |
2273 | memcpy(pos, mbssid + cpy_len, ((ie + ielen) - (mbssid + cpy_len))); | |
2274 | ||
2275 | /* update ie */ | |
2276 | new_ies->len = new_ie_len; | |
2277 | new_ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); | |
2278 | new_ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control); | |
2279 | memcpy(new_ies->data, new_ie, new_ie_len); | |
2280 | if (ieee80211_is_probe_resp(mgmt->frame_control)) { | |
7011ba58 SS |
2281 | old = rcu_access_pointer(nontrans_bss->proberesp_ies); |
2282 | rcu_assign_pointer(nontrans_bss->proberesp_ies, new_ies); | |
2283 | rcu_assign_pointer(nontrans_bss->ies, new_ies); | |
0b8fb823 PX |
2284 | if (old) |
2285 | kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head); | |
2286 | } else { | |
7011ba58 SS |
2287 | old = rcu_access_pointer(nontrans_bss->beacon_ies); |
2288 | rcu_assign_pointer(nontrans_bss->beacon_ies, new_ies); | |
2289 | rcu_assign_pointer(nontrans_bss->ies, new_ies); | |
0b8fb823 PX |
2290 | if (old) |
2291 | kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head); | |
2292 | } | |
bede8d29 SS |
2293 | |
2294 | out_free: | |
2295 | kfree(new_ie); | |
0b8fb823 | 2296 | } |
6e19bc4b | 2297 | |
0b8fb823 PX |
2298 | /* cfg80211_inform_bss_width_frame helper */ |
2299 | static struct cfg80211_bss * | |
2300 | cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy, | |
2301 | struct cfg80211_inform_bss *data, | |
2302 | struct ieee80211_mgmt *mgmt, size_t len, | |
0b8fb823 | 2303 | gfp_t gfp) |
2a519311 | 2304 | { |
9caf0364 JB |
2305 | struct cfg80211_internal_bss tmp = {}, *res; |
2306 | struct cfg80211_bss_ies *ies; | |
3afc2167 | 2307 | struct ieee80211_channel *channel; |
67af9811 | 2308 | bool signal_valid; |
9eaffe50 TP |
2309 | struct ieee80211_ext *ext = NULL; |
2310 | u8 *bssid, *variable; | |
2311 | u16 capability, beacon_int; | |
2312 | size_t ielen, min_hdr_len = offsetof(struct ieee80211_mgmt, | |
2313 | u.probe_resp.variable); | |
6eb18137 | 2314 | int bss_type; |
bef9bacc | 2315 | |
0172bb75 JB |
2316 | BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) != |
2317 | offsetof(struct ieee80211_mgmt, u.beacon.variable)); | |
2318 | ||
6e19bc4b | 2319 | trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len); |
4ee3e063 | 2320 | |
bef9bacc MK |
2321 | if (WARN_ON(!mgmt)) |
2322 | return NULL; | |
2323 | ||
2324 | if (WARN_ON(!wiphy)) | |
2325 | return NULL; | |
2a519311 | 2326 | |
22fe88d3 | 2327 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
6e19bc4b | 2328 | (data->signal < 0 || data->signal > 100))) |
2a519311 JB |
2329 | return NULL; |
2330 | ||
9eaffe50 TP |
2331 | if (ieee80211_is_s1g_beacon(mgmt->frame_control)) { |
2332 | ext = (void *) mgmt; | |
2333 | min_hdr_len = offsetof(struct ieee80211_ext, u.s1g_beacon); | |
2334 | if (ieee80211_is_s1g_short_beacon(mgmt->frame_control)) | |
2335 | min_hdr_len = offsetof(struct ieee80211_ext, | |
2336 | u.s1g_short_beacon.variable); | |
2337 | } | |
2338 | ||
2339 | if (WARN_ON(len < min_hdr_len)) | |
2a519311 JB |
2340 | return NULL; |
2341 | ||
9eaffe50 TP |
2342 | ielen = len - min_hdr_len; |
2343 | variable = mgmt->u.probe_resp.variable; | |
2344 | if (ext) { | |
2345 | if (ieee80211_is_s1g_short_beacon(mgmt->frame_control)) | |
2346 | variable = ext->u.s1g_short_beacon.variable; | |
2347 | else | |
2348 | variable = ext->u.s1g_beacon.variable; | |
2349 | } | |
2350 | ||
2351 | channel = cfg80211_get_bss_channel(wiphy, variable, | |
119f94a6 | 2352 | ielen, data->chan, data->scan_width); |
0172bb75 JB |
2353 | if (!channel) |
2354 | return NULL; | |
2355 | ||
9eaffe50 | 2356 | if (ext) { |
b5ac0146 JB |
2357 | const struct ieee80211_s1g_bcn_compat_ie *compat; |
2358 | const struct element *elem; | |
9eaffe50 | 2359 | |
b5ac0146 JB |
2360 | elem = cfg80211_find_elem(WLAN_EID_S1G_BCN_COMPAT, |
2361 | variable, ielen); | |
2362 | if (!elem) | |
2363 | return NULL; | |
2364 | if (elem->datalen < sizeof(*compat)) | |
9eaffe50 | 2365 | return NULL; |
b5ac0146 | 2366 | compat = (void *)elem->data; |
9eaffe50 TP |
2367 | bssid = ext->u.s1g_beacon.sa; |
2368 | capability = le16_to_cpu(compat->compat_info); | |
2369 | beacon_int = le16_to_cpu(compat->beacon_int); | |
2370 | } else { | |
2371 | bssid = mgmt->bssid; | |
2372 | beacon_int = le16_to_cpu(mgmt->u.probe_resp.beacon_int); | |
2373 | capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); | |
2374 | } | |
2375 | ||
0e227084 | 2376 | ies = kzalloc(sizeof(*ies) + ielen, gfp); |
9caf0364 | 2377 | if (!ies) |
2a519311 | 2378 | return NULL; |
9caf0364 | 2379 | ies->len = ielen; |
8cef2c9d | 2380 | ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); |
9eaffe50 TP |
2381 | ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control) || |
2382 | ieee80211_is_s1g_beacon(mgmt->frame_control); | |
2383 | memcpy(ies->data, variable, ielen); | |
2a519311 | 2384 | |
9caf0364 JB |
2385 | if (ieee80211_is_probe_resp(mgmt->frame_control)) |
2386 | rcu_assign_pointer(tmp.pub.proberesp_ies, ies); | |
2387 | else | |
2388 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); | |
2389 | rcu_assign_pointer(tmp.pub.ies, ies); | |
505a2e88 | 2390 | |
9eaffe50 TP |
2391 | memcpy(tmp.pub.bssid, bssid, ETH_ALEN); |
2392 | tmp.pub.beacon_interval = beacon_int; | |
2393 | tmp.pub.capability = capability; | |
9caf0364 | 2394 | tmp.pub.channel = channel; |
6e19bc4b DS |
2395 | tmp.pub.scan_width = data->scan_width; |
2396 | tmp.pub.signal = data->signal; | |
6e19bc4b | 2397 | tmp.ts_boottime = data->boottime_ns; |
1d76250b | 2398 | tmp.parent_tsf = data->parent_tsf; |
983dafaa SD |
2399 | tmp.pub.chains = data->chains; |
2400 | memcpy(tmp.pub.chain_signal, data->chain_signal, IEEE80211_MAX_CHAINS); | |
1d76250b | 2401 | ether_addr_copy(tmp.parent_bssid, data->parent_bssid); |
9caf0364 | 2402 | |
7bb106eb | 2403 | signal_valid = data->chan == channel; |
a3ce17d1 CT |
2404 | res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid, |
2405 | jiffies); | |
2a519311 JB |
2406 | if (!res) |
2407 | return NULL; | |
2408 | ||
57fbcce3 | 2409 | if (channel->band == NL80211_BAND_60GHZ) { |
6eb18137 DL |
2410 | bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK; |
2411 | if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP || | |
2412 | bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS) | |
2413 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
2414 | } else { | |
2415 | if (res->pub.capability & WLAN_CAPABILITY_ESS) | |
2416 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
2417 | } | |
e38f8a7a | 2418 | |
4ee3e063 | 2419 | trace_cfg80211_return_bss(&res->pub); |
2a519311 JB |
2420 | /* cfg80211_bss_update gives us a referenced result */ |
2421 | return &res->pub; | |
2422 | } | |
0b8fb823 PX |
2423 | |
2424 | struct cfg80211_bss * | |
2425 | cfg80211_inform_bss_frame_data(struct wiphy *wiphy, | |
2426 | struct cfg80211_inform_bss *data, | |
2427 | struct ieee80211_mgmt *mgmt, size_t len, | |
2428 | gfp_t gfp) | |
2429 | { | |
7011ba58 | 2430 | struct cfg80211_bss *res, *tmp_bss; |
0b8fb823 PX |
2431 | const u8 *ie = mgmt->u.probe_resp.variable; |
2432 | const struct cfg80211_bss_ies *ies1, *ies2; | |
2433 | size_t ielen = len - offsetof(struct ieee80211_mgmt, | |
2434 | u.probe_resp.variable); | |
0cd01efb | 2435 | struct cfg80211_non_tx_bss non_tx_data; |
0b8fb823 PX |
2436 | |
2437 | res = cfg80211_inform_single_bss_frame_data(wiphy, data, mgmt, | |
84f1772b | 2438 | len, gfp); |
213ed579 SS |
2439 | if (!res || !wiphy->support_mbssid || |
2440 | !cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen)) | |
2441 | return res; | |
2442 | if (wiphy->support_only_he_mbssid && | |
2443 | !cfg80211_find_ext_ie(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen)) | |
0b8fb823 PX |
2444 | return res; |
2445 | ||
0cd01efb | 2446 | non_tx_data.tx_bss = res; |
0b8fb823 | 2447 | /* process each non-transmitting bss */ |
0cd01efb SS |
2448 | cfg80211_parse_mbssid_frame_data(wiphy, data, mgmt, len, |
2449 | &non_tx_data, gfp); | |
0b8fb823 | 2450 | |
461c4c2b SS |
2451 | spin_lock_bh(&wiphy_to_rdev(wiphy)->bss_lock); |
2452 | ||
0b8fb823 PX |
2453 | /* check if the res has other nontransmitting bss which is not |
2454 | * in MBSSID IE | |
2455 | */ | |
2456 | ies1 = rcu_access_pointer(res->ies); | |
0b8fb823 PX |
2457 | |
2458 | /* go through nontrans_list, if the timestamp of the BSS is | |
2459 | * earlier than the timestamp of the transmitting BSS then | |
2460 | * update it | |
2461 | */ | |
7011ba58 | 2462 | list_for_each_entry(tmp_bss, &res->nontrans_list, |
0b8fb823 | 2463 | nontrans_list) { |
7011ba58 | 2464 | ies2 = rcu_access_pointer(tmp_bss->ies); |
0b8fb823 PX |
2465 | if (ies2->tsf < ies1->tsf) |
2466 | cfg80211_update_notlisted_nontrans(wiphy, tmp_bss, | |
461c4c2b | 2467 | mgmt, len); |
0b8fb823 | 2468 | } |
461c4c2b | 2469 | spin_unlock_bh(&wiphy_to_rdev(wiphy)->bss_lock); |
0b8fb823 PX |
2470 | |
2471 | return res; | |
2472 | } | |
6e19bc4b | 2473 | EXPORT_SYMBOL(cfg80211_inform_bss_frame_data); |
2a519311 | 2474 | |
5b112d3d | 2475 | void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
4c0c0b75 | 2476 | { |
f26cbf40 | 2477 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
4c0c0b75 JB |
2478 | struct cfg80211_internal_bss *bss; |
2479 | ||
2480 | if (!pub) | |
2481 | return; | |
2482 | ||
2483 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
776b3580 | 2484 | |
1b8ec87a ZG |
2485 | spin_lock_bh(&rdev->bss_lock); |
2486 | bss_ref_get(rdev, bss); | |
2487 | spin_unlock_bh(&rdev->bss_lock); | |
4c0c0b75 JB |
2488 | } |
2489 | EXPORT_SYMBOL(cfg80211_ref_bss); | |
2490 | ||
5b112d3d | 2491 | void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
2a519311 | 2492 | { |
f26cbf40 | 2493 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
2a519311 JB |
2494 | struct cfg80211_internal_bss *bss; |
2495 | ||
2496 | if (!pub) | |
2497 | return; | |
2498 | ||
2499 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
776b3580 | 2500 | |
1b8ec87a ZG |
2501 | spin_lock_bh(&rdev->bss_lock); |
2502 | bss_ref_put(rdev, bss); | |
2503 | spin_unlock_bh(&rdev->bss_lock); | |
2a519311 JB |
2504 | } |
2505 | EXPORT_SYMBOL(cfg80211_put_bss); | |
2506 | ||
d491af19 JB |
2507 | void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
2508 | { | |
f26cbf40 | 2509 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
7011ba58 SS |
2510 | struct cfg80211_internal_bss *bss, *tmp1; |
2511 | struct cfg80211_bss *nontrans_bss, *tmp; | |
d491af19 JB |
2512 | |
2513 | if (WARN_ON(!pub)) | |
2514 | return; | |
2515 | ||
2516 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
2517 | ||
1b8ec87a | 2518 | spin_lock_bh(&rdev->bss_lock); |
7011ba58 SS |
2519 | if (list_empty(&bss->list)) |
2520 | goto out; | |
2521 | ||
2522 | list_for_each_entry_safe(nontrans_bss, tmp, | |
2523 | &pub->nontrans_list, | |
2524 | nontrans_list) { | |
2525 | tmp1 = container_of(nontrans_bss, | |
2526 | struct cfg80211_internal_bss, pub); | |
2527 | if (__cfg80211_unlink_bss(rdev, tmp1)) | |
1b8ec87a | 2528 | rdev->bss_generation++; |
3207390a | 2529 | } |
7011ba58 SS |
2530 | |
2531 | if (__cfg80211_unlink_bss(rdev, bss)) | |
2532 | rdev->bss_generation++; | |
2533 | out: | |
1b8ec87a | 2534 | spin_unlock_bh(&rdev->bss_lock); |
d491af19 JB |
2535 | } |
2536 | EXPORT_SYMBOL(cfg80211_unlink_bss); | |
2537 | ||
4770c8f9 IP |
2538 | void cfg80211_bss_iter(struct wiphy *wiphy, |
2539 | struct cfg80211_chan_def *chandef, | |
2540 | void (*iter)(struct wiphy *wiphy, | |
2541 | struct cfg80211_bss *bss, | |
2542 | void *data), | |
2543 | void *iter_data) | |
2544 | { | |
2545 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); | |
2546 | struct cfg80211_internal_bss *bss; | |
2547 | ||
2548 | spin_lock_bh(&rdev->bss_lock); | |
2549 | ||
2550 | list_for_each_entry(bss, &rdev->bss_list, list) { | |
2551 | if (!chandef || cfg80211_is_sub_chan(chandef, bss->pub.channel)) | |
2552 | iter(wiphy, &bss->pub, iter_data); | |
2553 | } | |
2554 | ||
2555 | spin_unlock_bh(&rdev->bss_lock); | |
2556 | } | |
2557 | EXPORT_SYMBOL(cfg80211_bss_iter); | |
2558 | ||
0afd425b SM |
2559 | void cfg80211_update_assoc_bss_entry(struct wireless_dev *wdev, |
2560 | struct ieee80211_channel *chan) | |
2561 | { | |
2562 | struct wiphy *wiphy = wdev->wiphy; | |
2563 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); | |
2564 | struct cfg80211_internal_bss *cbss = wdev->current_bss; | |
2565 | struct cfg80211_internal_bss *new = NULL; | |
2566 | struct cfg80211_internal_bss *bss; | |
2567 | struct cfg80211_bss *nontrans_bss; | |
2568 | struct cfg80211_bss *tmp; | |
2569 | ||
2570 | spin_lock_bh(&rdev->bss_lock); | |
2571 | ||
05dcb8bb IP |
2572 | /* |
2573 | * Some APs use CSA also for bandwidth changes, i.e., without actually | |
2574 | * changing the control channel, so no need to update in such a case. | |
2575 | */ | |
2576 | if (cbss->pub.channel == chan) | |
0afd425b SM |
2577 | goto done; |
2578 | ||
2579 | /* use transmitting bss */ | |
2580 | if (cbss->pub.transmitted_bss) | |
2581 | cbss = container_of(cbss->pub.transmitted_bss, | |
2582 | struct cfg80211_internal_bss, | |
2583 | pub); | |
2584 | ||
2585 | cbss->pub.channel = chan; | |
2586 | ||
2587 | list_for_each_entry(bss, &rdev->bss_list, list) { | |
2588 | if (!cfg80211_bss_type_match(bss->pub.capability, | |
2589 | bss->pub.channel->band, | |
2590 | wdev->conn_bss_type)) | |
2591 | continue; | |
2592 | ||
2593 | if (bss == cbss) | |
2594 | continue; | |
2595 | ||
2596 | if (!cmp_bss(&bss->pub, &cbss->pub, BSS_CMP_REGULAR)) { | |
2597 | new = bss; | |
2598 | break; | |
2599 | } | |
2600 | } | |
2601 | ||
2602 | if (new) { | |
2603 | /* to save time, update IEs for transmitting bss only */ | |
2604 | if (cfg80211_update_known_bss(rdev, cbss, new, false)) { | |
2605 | new->pub.proberesp_ies = NULL; | |
2606 | new->pub.beacon_ies = NULL; | |
2607 | } | |
2608 | ||
2609 | list_for_each_entry_safe(nontrans_bss, tmp, | |
2610 | &new->pub.nontrans_list, | |
2611 | nontrans_list) { | |
2612 | bss = container_of(nontrans_bss, | |
2613 | struct cfg80211_internal_bss, pub); | |
2614 | if (__cfg80211_unlink_bss(rdev, bss)) | |
2615 | rdev->bss_generation++; | |
2616 | } | |
2617 | ||
2618 | WARN_ON(atomic_read(&new->hold)); | |
2619 | if (!WARN_ON(!__cfg80211_unlink_bss(rdev, new))) | |
2620 | rdev->bss_generation++; | |
2621 | } | |
2622 | ||
2623 | rb_erase(&cbss->rbn, &rdev->bss_tree); | |
2624 | rb_insert_bss(rdev, cbss); | |
2625 | rdev->bss_generation++; | |
2626 | ||
2627 | list_for_each_entry_safe(nontrans_bss, tmp, | |
2628 | &cbss->pub.nontrans_list, | |
2629 | nontrans_list) { | |
2630 | bss = container_of(nontrans_bss, | |
2631 | struct cfg80211_internal_bss, pub); | |
2632 | bss->pub.channel = chan; | |
2633 | rb_erase(&bss->rbn, &rdev->bss_tree); | |
2634 | rb_insert_bss(rdev, bss); | |
2635 | rdev->bss_generation++; | |
2636 | } | |
2637 | ||
2638 | done: | |
2639 | spin_unlock_bh(&rdev->bss_lock); | |
2640 | } | |
2641 | ||
3d23e349 | 2642 | #ifdef CONFIG_CFG80211_WEXT |
9f419f38 JB |
2643 | static struct cfg80211_registered_device * |
2644 | cfg80211_get_dev_from_ifindex(struct net *net, int ifindex) | |
2645 | { | |
5fe231e8 | 2646 | struct cfg80211_registered_device *rdev; |
9f419f38 JB |
2647 | struct net_device *dev; |
2648 | ||
5fe231e8 JB |
2649 | ASSERT_RTNL(); |
2650 | ||
9f419f38 JB |
2651 | dev = dev_get_by_index(net, ifindex); |
2652 | if (!dev) | |
5fe231e8 JB |
2653 | return ERR_PTR(-ENODEV); |
2654 | if (dev->ieee80211_ptr) | |
f26cbf40 | 2655 | rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy); |
5fe231e8 | 2656 | else |
9f419f38 JB |
2657 | rdev = ERR_PTR(-ENODEV); |
2658 | dev_put(dev); | |
9f419f38 JB |
2659 | return rdev; |
2660 | } | |
2661 | ||
2a519311 JB |
2662 | int cfg80211_wext_siwscan(struct net_device *dev, |
2663 | struct iw_request_info *info, | |
2664 | union iwreq_data *wrqu, char *extra) | |
2665 | { | |
2666 | struct cfg80211_registered_device *rdev; | |
2667 | struct wiphy *wiphy; | |
2668 | struct iw_scan_req *wreq = NULL; | |
65486c8b | 2669 | struct cfg80211_scan_request *creq = NULL; |
2a519311 | 2670 | int i, err, n_channels = 0; |
57fbcce3 | 2671 | enum nl80211_band band; |
2a519311 JB |
2672 | |
2673 | if (!netif_running(dev)) | |
2674 | return -ENETDOWN; | |
2675 | ||
b2e3abdc HS |
2676 | if (wrqu->data.length == sizeof(struct iw_scan_req)) |
2677 | wreq = (struct iw_scan_req *)extra; | |
2678 | ||
463d0183 | 2679 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
2680 | |
2681 | if (IS_ERR(rdev)) | |
2682 | return PTR_ERR(rdev); | |
2683 | ||
f9d15d16 | 2684 | if (rdev->scan_req || rdev->scan_msg) { |
2a519311 JB |
2685 | err = -EBUSY; |
2686 | goto out; | |
2687 | } | |
2688 | ||
2689 | wiphy = &rdev->wiphy; | |
2690 | ||
b2e3abdc HS |
2691 | /* Determine number of channels, needed to allocate creq */ |
2692 | if (wreq && wreq->num_channels) | |
2693 | n_channels = wreq->num_channels; | |
bdfbec2d IP |
2694 | else |
2695 | n_channels = ieee80211_get_num_supported_channels(wiphy); | |
2a519311 JB |
2696 | |
2697 | creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + | |
2698 | n_channels * sizeof(void *), | |
2699 | GFP_ATOMIC); | |
2700 | if (!creq) { | |
2701 | err = -ENOMEM; | |
2702 | goto out; | |
2703 | } | |
2704 | ||
2705 | creq->wiphy = wiphy; | |
fd014284 | 2706 | creq->wdev = dev->ieee80211_ptr; |
5ba63533 JB |
2707 | /* SSIDs come after channels */ |
2708 | creq->ssids = (void *)&creq->channels[n_channels]; | |
2a519311 JB |
2709 | creq->n_channels = n_channels; |
2710 | creq->n_ssids = 1; | |
15d6030b | 2711 | creq->scan_start = jiffies; |
2a519311 | 2712 | |
b2e3abdc | 2713 | /* translate "Scan on frequencies" request */ |
2a519311 | 2714 | i = 0; |
57fbcce3 | 2715 | for (band = 0; band < NUM_NL80211_BANDS; band++) { |
2a519311 | 2716 | int j; |
584991dc | 2717 | |
2a519311 JB |
2718 | if (!wiphy->bands[band]) |
2719 | continue; | |
584991dc | 2720 | |
2a519311 | 2721 | for (j = 0; j < wiphy->bands[band]->n_channels; j++) { |
584991dc JB |
2722 | /* ignore disabled channels */ |
2723 | if (wiphy->bands[band]->channels[j].flags & | |
2724 | IEEE80211_CHAN_DISABLED) | |
2725 | continue; | |
b2e3abdc HS |
2726 | |
2727 | /* If we have a wireless request structure and the | |
2728 | * wireless request specifies frequencies, then search | |
2729 | * for the matching hardware channel. | |
2730 | */ | |
2731 | if (wreq && wreq->num_channels) { | |
2732 | int k; | |
2733 | int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; | |
2734 | for (k = 0; k < wreq->num_channels; k++) { | |
96998e3a ZG |
2735 | struct iw_freq *freq = |
2736 | &wreq->channel_list[k]; | |
2737 | int wext_freq = | |
2738 | cfg80211_wext_freq(freq); | |
2739 | ||
b2e3abdc HS |
2740 | if (wext_freq == wiphy_freq) |
2741 | goto wext_freq_found; | |
2742 | } | |
2743 | goto wext_freq_not_found; | |
2744 | } | |
2745 | ||
2746 | wext_freq_found: | |
2a519311 JB |
2747 | creq->channels[i] = &wiphy->bands[band]->channels[j]; |
2748 | i++; | |
b2e3abdc | 2749 | wext_freq_not_found: ; |
2a519311 JB |
2750 | } |
2751 | } | |
8862dc5f HS |
2752 | /* No channels found? */ |
2753 | if (!i) { | |
2754 | err = -EINVAL; | |
2755 | goto out; | |
2756 | } | |
2a519311 | 2757 | |
b2e3abdc HS |
2758 | /* Set real number of channels specified in creq->channels[] */ |
2759 | creq->n_channels = i; | |
2a519311 | 2760 | |
b2e3abdc HS |
2761 | /* translate "Scan for SSID" request */ |
2762 | if (wreq) { | |
2a519311 | 2763 | if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { |
65486c8b JB |
2764 | if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { |
2765 | err = -EINVAL; | |
2766 | goto out; | |
2767 | } | |
2a519311 JB |
2768 | memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); |
2769 | creq->ssids[0].ssid_len = wreq->essid_len; | |
2770 | } | |
2771 | if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) | |
2772 | creq->n_ssids = 0; | |
2773 | } | |
2774 | ||
57fbcce3 | 2775 | for (i = 0; i < NUM_NL80211_BANDS; i++) |
a401d2bb JB |
2776 | if (wiphy->bands[i]) |
2777 | creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1; | |
34850ab2 | 2778 | |
818965d3 JM |
2779 | eth_broadcast_addr(creq->bssid); |
2780 | ||
a05829a7 JB |
2781 | wiphy_lock(&rdev->wiphy); |
2782 | ||
2a519311 | 2783 | rdev->scan_req = creq; |
e35e4d28 | 2784 | err = rdev_scan(rdev, creq); |
2a519311 JB |
2785 | if (err) { |
2786 | rdev->scan_req = NULL; | |
65486c8b | 2787 | /* creq will be freed below */ |
463d0183 | 2788 | } else { |
fd014284 | 2789 | nl80211_send_scan_start(rdev, dev->ieee80211_ptr); |
65486c8b JB |
2790 | /* creq now owned by driver */ |
2791 | creq = NULL; | |
463d0183 JB |
2792 | dev_hold(dev); |
2793 | } | |
a05829a7 | 2794 | wiphy_unlock(&rdev->wiphy); |
2a519311 | 2795 | out: |
65486c8b | 2796 | kfree(creq); |
2a519311 JB |
2797 | return err; |
2798 | } | |
2afe38d1 | 2799 | EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan); |
2a519311 | 2800 | |
76a70e9c JM |
2801 | static char *ieee80211_scan_add_ies(struct iw_request_info *info, |
2802 | const struct cfg80211_bss_ies *ies, | |
2803 | char *current_ev, char *end_buf) | |
2a519311 | 2804 | { |
9caf0364 | 2805 | const u8 *pos, *end, *next; |
2a519311 JB |
2806 | struct iw_event iwe; |
2807 | ||
9caf0364 | 2808 | if (!ies) |
76a70e9c | 2809 | return current_ev; |
2a519311 JB |
2810 | |
2811 | /* | |
2812 | * If needed, fragment the IEs buffer (at IE boundaries) into short | |
2813 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. | |
2814 | */ | |
9caf0364 JB |
2815 | pos = ies->data; |
2816 | end = pos + ies->len; | |
2a519311 JB |
2817 | |
2818 | while (end - pos > IW_GENERIC_IE_MAX) { | |
2819 | next = pos + 2 + pos[1]; | |
2820 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) | |
2821 | next = next + 2 + next[1]; | |
2822 | ||
2823 | memset(&iwe, 0, sizeof(iwe)); | |
2824 | iwe.cmd = IWEVGENIE; | |
2825 | iwe.u.data.length = next - pos; | |
76a70e9c JM |
2826 | current_ev = iwe_stream_add_point_check(info, current_ev, |
2827 | end_buf, &iwe, | |
2828 | (void *)pos); | |
2829 | if (IS_ERR(current_ev)) | |
2830 | return current_ev; | |
2a519311 JB |
2831 | pos = next; |
2832 | } | |
2833 | ||
2834 | if (end > pos) { | |
2835 | memset(&iwe, 0, sizeof(iwe)); | |
2836 | iwe.cmd = IWEVGENIE; | |
2837 | iwe.u.data.length = end - pos; | |
76a70e9c JM |
2838 | current_ev = iwe_stream_add_point_check(info, current_ev, |
2839 | end_buf, &iwe, | |
2840 | (void *)pos); | |
2841 | if (IS_ERR(current_ev)) | |
2842 | return current_ev; | |
2a519311 | 2843 | } |
76a70e9c JM |
2844 | |
2845 | return current_ev; | |
2a519311 JB |
2846 | } |
2847 | ||
2a519311 | 2848 | static char * |
77965c97 JB |
2849 | ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, |
2850 | struct cfg80211_internal_bss *bss, char *current_ev, | |
2851 | char *end_buf) | |
2a519311 | 2852 | { |
9caf0364 | 2853 | const struct cfg80211_bss_ies *ies; |
2a519311 | 2854 | struct iw_event iwe; |
9caf0364 | 2855 | const u8 *ie; |
76a70e9c JM |
2856 | u8 buf[50]; |
2857 | u8 *cfg, *p, *tmp; | |
9caf0364 | 2858 | int rem, i, sig; |
2a519311 JB |
2859 | bool ismesh = false; |
2860 | ||
2861 | memset(&iwe, 0, sizeof(iwe)); | |
2862 | iwe.cmd = SIOCGIWAP; | |
2863 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; | |
2864 | memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); | |
76a70e9c JM |
2865 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
2866 | IW_EV_ADDR_LEN); | |
2867 | if (IS_ERR(current_ev)) | |
2868 | return current_ev; | |
2a519311 JB |
2869 | |
2870 | memset(&iwe, 0, sizeof(iwe)); | |
2871 | iwe.cmd = SIOCGIWFREQ; | |
2872 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); | |
2873 | iwe.u.freq.e = 0; | |
76a70e9c JM |
2874 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
2875 | IW_EV_FREQ_LEN); | |
2876 | if (IS_ERR(current_ev)) | |
2877 | return current_ev; | |
2a519311 JB |
2878 | |
2879 | memset(&iwe, 0, sizeof(iwe)); | |
2880 | iwe.cmd = SIOCGIWFREQ; | |
2881 | iwe.u.freq.m = bss->pub.channel->center_freq; | |
2882 | iwe.u.freq.e = 6; | |
76a70e9c JM |
2883 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
2884 | IW_EV_FREQ_LEN); | |
2885 | if (IS_ERR(current_ev)) | |
2886 | return current_ev; | |
2a519311 | 2887 | |
77965c97 | 2888 | if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { |
2a519311 JB |
2889 | memset(&iwe, 0, sizeof(iwe)); |
2890 | iwe.cmd = IWEVQUAL; | |
2891 | iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | | |
2892 | IW_QUAL_NOISE_INVALID | | |
a77b8552 | 2893 | IW_QUAL_QUAL_UPDATED; |
77965c97 | 2894 | switch (wiphy->signal_type) { |
2a519311 | 2895 | case CFG80211_SIGNAL_TYPE_MBM: |
a77b8552 JB |
2896 | sig = bss->pub.signal / 100; |
2897 | iwe.u.qual.level = sig; | |
2a519311 | 2898 | iwe.u.qual.updated |= IW_QUAL_DBM; |
a77b8552 JB |
2899 | if (sig < -110) /* rather bad */ |
2900 | sig = -110; | |
2901 | else if (sig > -40) /* perfect */ | |
2902 | sig = -40; | |
2903 | /* will give a range of 0 .. 70 */ | |
2904 | iwe.u.qual.qual = sig + 110; | |
2a519311 JB |
2905 | break; |
2906 | case CFG80211_SIGNAL_TYPE_UNSPEC: | |
2907 | iwe.u.qual.level = bss->pub.signal; | |
a77b8552 JB |
2908 | /* will give range 0 .. 100 */ |
2909 | iwe.u.qual.qual = bss->pub.signal; | |
2a519311 JB |
2910 | break; |
2911 | default: | |
2912 | /* not reached */ | |
2913 | break; | |
2914 | } | |
76a70e9c JM |
2915 | current_ev = iwe_stream_add_event_check(info, current_ev, |
2916 | end_buf, &iwe, | |
2917 | IW_EV_QUAL_LEN); | |
2918 | if (IS_ERR(current_ev)) | |
2919 | return current_ev; | |
2a519311 JB |
2920 | } |
2921 | ||
2922 | memset(&iwe, 0, sizeof(iwe)); | |
2923 | iwe.cmd = SIOCGIWENCODE; | |
2924 | if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) | |
2925 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; | |
2926 | else | |
2927 | iwe.u.data.flags = IW_ENCODE_DISABLED; | |
2928 | iwe.u.data.length = 0; | |
76a70e9c JM |
2929 | current_ev = iwe_stream_add_point_check(info, current_ev, end_buf, |
2930 | &iwe, ""); | |
2931 | if (IS_ERR(current_ev)) | |
2932 | return current_ev; | |
2a519311 | 2933 | |
9caf0364 JB |
2934 | rcu_read_lock(); |
2935 | ies = rcu_dereference(bss->pub.ies); | |
83c7aa1a JB |
2936 | rem = ies->len; |
2937 | ie = ies->data; | |
9caf0364 | 2938 | |
83c7aa1a | 2939 | while (rem >= 2) { |
2a519311 JB |
2940 | /* invalid data */ |
2941 | if (ie[1] > rem - 2) | |
2942 | break; | |
2943 | ||
2944 | switch (ie[0]) { | |
2945 | case WLAN_EID_SSID: | |
2946 | memset(&iwe, 0, sizeof(iwe)); | |
2947 | iwe.cmd = SIOCGIWESSID; | |
2948 | iwe.u.data.length = ie[1]; | |
2949 | iwe.u.data.flags = 1; | |
76a70e9c JM |
2950 | current_ev = iwe_stream_add_point_check(info, |
2951 | current_ev, | |
2952 | end_buf, &iwe, | |
2953 | (u8 *)ie + 2); | |
2954 | if (IS_ERR(current_ev)) | |
2955 | goto unlock; | |
2a519311 JB |
2956 | break; |
2957 | case WLAN_EID_MESH_ID: | |
2958 | memset(&iwe, 0, sizeof(iwe)); | |
2959 | iwe.cmd = SIOCGIWESSID; | |
2960 | iwe.u.data.length = ie[1]; | |
2961 | iwe.u.data.flags = 1; | |
76a70e9c JM |
2962 | current_ev = iwe_stream_add_point_check(info, |
2963 | current_ev, | |
2964 | end_buf, &iwe, | |
2965 | (u8 *)ie + 2); | |
2966 | if (IS_ERR(current_ev)) | |
2967 | goto unlock; | |
2a519311 JB |
2968 | break; |
2969 | case WLAN_EID_MESH_CONFIG: | |
2970 | ismesh = true; | |
136cfa28 | 2971 | if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) |
2a519311 | 2972 | break; |
9caf0364 | 2973 | cfg = (u8 *)ie + 2; |
2a519311 JB |
2974 | memset(&iwe, 0, sizeof(iwe)); |
2975 | iwe.cmd = IWEVCUSTOM; | |
76aa5e70 RP |
2976 | sprintf(buf, "Mesh Network Path Selection Protocol ID: " |
2977 | "0x%02X", cfg[0]); | |
2a519311 | 2978 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
2979 | current_ev = iwe_stream_add_point_check(info, |
2980 | current_ev, | |
2981 | end_buf, | |
2982 | &iwe, buf); | |
2983 | if (IS_ERR(current_ev)) | |
2984 | goto unlock; | |
76aa5e70 RP |
2985 | sprintf(buf, "Path Selection Metric ID: 0x%02X", |
2986 | cfg[1]); | |
2a519311 | 2987 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
2988 | current_ev = iwe_stream_add_point_check(info, |
2989 | current_ev, | |
2990 | end_buf, | |
2991 | &iwe, buf); | |
2992 | if (IS_ERR(current_ev)) | |
2993 | goto unlock; | |
76aa5e70 RP |
2994 | sprintf(buf, "Congestion Control Mode ID: 0x%02X", |
2995 | cfg[2]); | |
2a519311 | 2996 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
2997 | current_ev = iwe_stream_add_point_check(info, |
2998 | current_ev, | |
2999 | end_buf, | |
3000 | &iwe, buf); | |
3001 | if (IS_ERR(current_ev)) | |
3002 | goto unlock; | |
76aa5e70 | 3003 | sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]); |
2a519311 | 3004 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
3005 | current_ev = iwe_stream_add_point_check(info, |
3006 | current_ev, | |
3007 | end_buf, | |
3008 | &iwe, buf); | |
3009 | if (IS_ERR(current_ev)) | |
3010 | goto unlock; | |
76aa5e70 RP |
3011 | sprintf(buf, "Authentication ID: 0x%02X", cfg[4]); |
3012 | iwe.u.data.length = strlen(buf); | |
76a70e9c JM |
3013 | current_ev = iwe_stream_add_point_check(info, |
3014 | current_ev, | |
3015 | end_buf, | |
3016 | &iwe, buf); | |
3017 | if (IS_ERR(current_ev)) | |
3018 | goto unlock; | |
76aa5e70 RP |
3019 | sprintf(buf, "Formation Info: 0x%02X", cfg[5]); |
3020 | iwe.u.data.length = strlen(buf); | |
76a70e9c JM |
3021 | current_ev = iwe_stream_add_point_check(info, |
3022 | current_ev, | |
3023 | end_buf, | |
3024 | &iwe, buf); | |
3025 | if (IS_ERR(current_ev)) | |
3026 | goto unlock; | |
76aa5e70 | 3027 | sprintf(buf, "Capabilities: 0x%02X", cfg[6]); |
2a519311 | 3028 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
3029 | current_ev = iwe_stream_add_point_check(info, |
3030 | current_ev, | |
3031 | end_buf, | |
3032 | &iwe, buf); | |
3033 | if (IS_ERR(current_ev)) | |
3034 | goto unlock; | |
2a519311 JB |
3035 | break; |
3036 | case WLAN_EID_SUPP_RATES: | |
3037 | case WLAN_EID_EXT_SUPP_RATES: | |
3038 | /* display all supported rates in readable format */ | |
3039 | p = current_ev + iwe_stream_lcp_len(info); | |
3040 | ||
3041 | memset(&iwe, 0, sizeof(iwe)); | |
3042 | iwe.cmd = SIOCGIWRATE; | |
3043 | /* Those two flags are ignored... */ | |
3044 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; | |
3045 | ||
3046 | for (i = 0; i < ie[1]; i++) { | |
3047 | iwe.u.bitrate.value = | |
3048 | ((ie[i + 2] & 0x7f) * 500000); | |
76a70e9c | 3049 | tmp = p; |
2a519311 | 3050 | p = iwe_stream_add_value(info, current_ev, p, |
76a70e9c JM |
3051 | end_buf, &iwe, |
3052 | IW_EV_PARAM_LEN); | |
3053 | if (p == tmp) { | |
3054 | current_ev = ERR_PTR(-E2BIG); | |
3055 | goto unlock; | |
3056 | } | |
2a519311 JB |
3057 | } |
3058 | current_ev = p; | |
3059 | break; | |
3060 | } | |
3061 | rem -= ie[1] + 2; | |
3062 | ie += ie[1] + 2; | |
3063 | } | |
3064 | ||
f64f9e71 JP |
3065 | if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || |
3066 | ismesh) { | |
2a519311 JB |
3067 | memset(&iwe, 0, sizeof(iwe)); |
3068 | iwe.cmd = SIOCGIWMODE; | |
3069 | if (ismesh) | |
3070 | iwe.u.mode = IW_MODE_MESH; | |
3071 | else if (bss->pub.capability & WLAN_CAPABILITY_ESS) | |
3072 | iwe.u.mode = IW_MODE_MASTER; | |
3073 | else | |
3074 | iwe.u.mode = IW_MODE_ADHOC; | |
76a70e9c JM |
3075 | current_ev = iwe_stream_add_event_check(info, current_ev, |
3076 | end_buf, &iwe, | |
3077 | IW_EV_UINT_LEN); | |
3078 | if (IS_ERR(current_ev)) | |
3079 | goto unlock; | |
2a519311 JB |
3080 | } |
3081 | ||
76a70e9c JM |
3082 | memset(&iwe, 0, sizeof(iwe)); |
3083 | iwe.cmd = IWEVCUSTOM; | |
3084 | sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf)); | |
3085 | iwe.u.data.length = strlen(buf); | |
3086 | current_ev = iwe_stream_add_point_check(info, current_ev, end_buf, | |
3087 | &iwe, buf); | |
3088 | if (IS_ERR(current_ev)) | |
3089 | goto unlock; | |
3090 | memset(&iwe, 0, sizeof(iwe)); | |
3091 | iwe.cmd = IWEVCUSTOM; | |
3092 | sprintf(buf, " Last beacon: %ums ago", | |
3093 | elapsed_jiffies_msecs(bss->ts)); | |
3094 | iwe.u.data.length = strlen(buf); | |
3095 | current_ev = iwe_stream_add_point_check(info, current_ev, | |
3096 | end_buf, &iwe, buf); | |
3097 | if (IS_ERR(current_ev)) | |
3098 | goto unlock; | |
3099 | ||
3100 | current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf); | |
3101 | ||
3102 | unlock: | |
9caf0364 | 3103 | rcu_read_unlock(); |
2a519311 JB |
3104 | return current_ev; |
3105 | } | |
3106 | ||
3107 | ||
1b8ec87a | 3108 | static int ieee80211_scan_results(struct cfg80211_registered_device *rdev, |
2a519311 JB |
3109 | struct iw_request_info *info, |
3110 | char *buf, size_t len) | |
3111 | { | |
3112 | char *current_ev = buf; | |
3113 | char *end_buf = buf + len; | |
3114 | struct cfg80211_internal_bss *bss; | |
76a70e9c | 3115 | int err = 0; |
2a519311 | 3116 | |
1b8ec87a ZG |
3117 | spin_lock_bh(&rdev->bss_lock); |
3118 | cfg80211_bss_expire(rdev); | |
2a519311 | 3119 | |
1b8ec87a | 3120 | list_for_each_entry(bss, &rdev->bss_list, list) { |
2a519311 | 3121 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { |
76a70e9c JM |
3122 | err = -E2BIG; |
3123 | break; | |
2a519311 | 3124 | } |
1b8ec87a | 3125 | current_ev = ieee80211_bss(&rdev->wiphy, info, bss, |
77965c97 | 3126 | current_ev, end_buf); |
76a70e9c JM |
3127 | if (IS_ERR(current_ev)) { |
3128 | err = PTR_ERR(current_ev); | |
3129 | break; | |
3130 | } | |
2a519311 | 3131 | } |
1b8ec87a | 3132 | spin_unlock_bh(&rdev->bss_lock); |
76a70e9c JM |
3133 | |
3134 | if (err) | |
3135 | return err; | |
2a519311 JB |
3136 | return current_ev - buf; |
3137 | } | |
3138 | ||
3139 | ||
3140 | int cfg80211_wext_giwscan(struct net_device *dev, | |
3141 | struct iw_request_info *info, | |
3142 | struct iw_point *data, char *extra) | |
3143 | { | |
3144 | struct cfg80211_registered_device *rdev; | |
3145 | int res; | |
3146 | ||
3147 | if (!netif_running(dev)) | |
3148 | return -ENETDOWN; | |
3149 | ||
463d0183 | 3150 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
3151 | |
3152 | if (IS_ERR(rdev)) | |
3153 | return PTR_ERR(rdev); | |
3154 | ||
f9d15d16 | 3155 | if (rdev->scan_req || rdev->scan_msg) |
5fe231e8 | 3156 | return -EAGAIN; |
2a519311 JB |
3157 | |
3158 | res = ieee80211_scan_results(rdev, info, extra, data->length); | |
3159 | data->length = 0; | |
3160 | if (res >= 0) { | |
3161 | data->length = res; | |
3162 | res = 0; | |
3163 | } | |
3164 | ||
2a519311 JB |
3165 | return res; |
3166 | } | |
2afe38d1 | 3167 | EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan); |
2a519311 | 3168 | #endif |