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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 |
7b5e25b8 | 8 | * Copyright (C) 2018-2024 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 | 22 | #include <net/iw_handler.h> |
9d027a35 | 23 | #include <kunit/visibility.h> |
2a519311 JB |
24 | #include "core.h" |
25 | #include "nl80211.h" | |
a9a11622 | 26 | #include "wext-compat.h" |
e35e4d28 | 27 | #include "rdev-ops.h" |
2a519311 | 28 | |
776b3580 JB |
29 | /** |
30 | * DOC: BSS tree/list structure | |
31 | * | |
32 | * At the top level, the BSS list is kept in both a list in each | |
33 | * registered device (@bss_list) as well as an RB-tree for faster | |
34 | * lookup. In the RB-tree, entries can be looked up using their | |
35 | * channel, MESHID, MESHCONF (for MBSSes) or channel, BSSID, SSID | |
36 | * for other BSSes. | |
37 | * | |
38 | * Due to the possibility of hidden SSIDs, there's a second level | |
39 | * structure, the "hidden_list" and "hidden_beacon_bss" pointer. | |
40 | * The hidden_list connects all BSSes belonging to a single AP | |
41 | * that has a hidden SSID, and connects beacon and probe response | |
42 | * entries. For a probe response entry for a hidden SSID, the | |
43 | * hidden_beacon_bss pointer points to the BSS struct holding the | |
44 | * beacon's information. | |
45 | * | |
46 | * Reference counting is done for all these references except for | |
47 | * the hidden_list, so that a beacon BSS struct that is otherwise | |
48 | * not referenced has one reference for being on the bss_list and | |
49 | * one for each probe response entry that points to it using the | |
50 | * hidden_beacon_bss pointer. When a BSS struct that has such a | |
51 | * pointer is get/put, the refcount update is also propagated to | |
52 | * the referenced struct, this ensure that it cannot get removed | |
53 | * while somebody is using the probe response version. | |
54 | * | |
55 | * Note that the hidden_beacon_bss pointer never changes, due to | |
56 | * the reference counting. Therefore, no locking is needed for | |
57 | * it. | |
58 | * | |
59 | * Also note that the hidden_beacon_bss pointer is only relevant | |
60 | * if the driver uses something other than the IEs, e.g. private | |
8cf5c86d | 61 | * data stored in the BSS struct, since the beacon IEs are |
776b3580 JB |
62 | * also linked into the probe response struct. |
63 | */ | |
64 | ||
9853a55e JB |
65 | /* |
66 | * Limit the number of BSS entries stored in mac80211. Each one is | |
67 | * a bit over 4k at most, so this limits to roughly 4-5M of memory. | |
68 | * If somebody wants to really attack this though, they'd likely | |
69 | * use small beacons, and only one type of frame, limiting each of | |
70 | * the entries to a much smaller size (in order to generate more | |
71 | * entries in total, so overhead is bigger.) | |
72 | */ | |
73 | static int bss_entries_limit = 1000; | |
74 | module_param(bss_entries_limit, int, 0644); | |
75 | MODULE_PARM_DESC(bss_entries_limit, | |
76 | "limit to number of scan BSS entries (per wiphy, default 1000)"); | |
77 | ||
f9616e0f | 78 | #define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ) |
2a519311 | 79 | |
776b3580 | 80 | static void bss_free(struct cfg80211_internal_bss *bss) |
e8e27c66 | 81 | { |
9caf0364 | 82 | struct cfg80211_bss_ies *ies; |
b629ea3d JB |
83 | |
84 | if (WARN_ON(atomic_read(&bss->hold))) | |
85 | return; | |
86 | ||
9caf0364 | 87 | ies = (void *)rcu_access_pointer(bss->pub.beacon_ies); |
776b3580 | 88 | if (ies && !bss->pub.hidden_beacon_bss) |
9caf0364 JB |
89 | kfree_rcu(ies, rcu_head); |
90 | ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies); | |
91 | if (ies) | |
92 | kfree_rcu(ies, rcu_head); | |
e8e27c66 | 93 | |
776b3580 JB |
94 | /* |
95 | * This happens when the module is removed, it doesn't | |
96 | * really matter any more save for completeness | |
97 | */ | |
98 | if (!list_empty(&bss->hidden_list)) | |
99 | list_del(&bss->hidden_list); | |
100 | ||
e8e27c66 AK |
101 | kfree(bss); |
102 | } | |
103 | ||
1b8ec87a | 104 | static inline void bss_ref_get(struct cfg80211_registered_device *rdev, |
776b3580 | 105 | struct cfg80211_internal_bss *bss) |
0532d4f1 | 106 | { |
1b8ec87a | 107 | lockdep_assert_held(&rdev->bss_lock); |
776b3580 JB |
108 | |
109 | bss->refcount++; | |
0b780881 JB |
110 | |
111 | if (bss->pub.hidden_beacon_bss) | |
112 | bss_from_pub(bss->pub.hidden_beacon_bss)->refcount++; | |
113 | ||
114 | if (bss->pub.transmitted_bss) | |
115 | bss_from_pub(bss->pub.transmitted_bss)->refcount++; | |
0532d4f1 JB |
116 | } |
117 | ||
1b8ec87a | 118 | static inline void bss_ref_put(struct cfg80211_registered_device *rdev, |
776b3580 | 119 | struct cfg80211_internal_bss *bss) |
0532d4f1 | 120 | { |
1b8ec87a | 121 | lockdep_assert_held(&rdev->bss_lock); |
776b3580 JB |
122 | |
123 | if (bss->pub.hidden_beacon_bss) { | |
124 | struct cfg80211_internal_bss *hbss; | |
61e41e5d JB |
125 | |
126 | hbss = bss_from_pub(bss->pub.hidden_beacon_bss); | |
776b3580 JB |
127 | hbss->refcount--; |
128 | if (hbss->refcount == 0) | |
129 | bss_free(hbss); | |
130 | } | |
a3584f56 | 131 | |
7011ba58 | 132 | if (bss->pub.transmitted_bss) { |
a3584f56 SS |
133 | struct cfg80211_internal_bss *tbss; |
134 | ||
61e41e5d | 135 | tbss = bss_from_pub(bss->pub.transmitted_bss); |
a3584f56 SS |
136 | tbss->refcount--; |
137 | if (tbss->refcount == 0) | |
138 | bss_free(tbss); | |
139 | } | |
140 | ||
776b3580 JB |
141 | bss->refcount--; |
142 | if (bss->refcount == 0) | |
143 | bss_free(bss); | |
0532d4f1 JB |
144 | } |
145 | ||
1b8ec87a | 146 | static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev, |
e8e27c66 AK |
147 | struct cfg80211_internal_bss *bss) |
148 | { | |
1b8ec87a | 149 | lockdep_assert_held(&rdev->bss_lock); |
4b1af479 | 150 | |
776b3580 JB |
151 | if (!list_empty(&bss->hidden_list)) { |
152 | /* | |
153 | * don't remove the beacon entry if it has | |
154 | * probe responses associated with it | |
155 | */ | |
156 | if (!bss->pub.hidden_beacon_bss) | |
157 | return false; | |
158 | /* | |
159 | * if it's a probe response entry break its | |
160 | * link to the other entries in the group | |
161 | */ | |
162 | list_del_init(&bss->hidden_list); | |
163 | } | |
164 | ||
e8e27c66 | 165 | list_del_init(&bss->list); |
7011ba58 | 166 | list_del_init(&bss->pub.nontrans_list); |
1b8ec87a | 167 | rb_erase(&bss->rbn, &rdev->bss_tree); |
9853a55e JB |
168 | rdev->bss_entries--; |
169 | WARN_ONCE((rdev->bss_entries == 0) ^ list_empty(&rdev->bss_list), | |
170 | "rdev bss entries[%d]/list[empty:%d] corruption\n", | |
171 | rdev->bss_entries, list_empty(&rdev->bss_list)); | |
1b8ec87a | 172 | bss_ref_put(rdev, bss); |
776b3580 | 173 | return true; |
e8e27c66 AK |
174 | } |
175 | ||
f7dacfb1 SS |
176 | bool cfg80211_is_element_inherited(const struct element *elem, |
177 | const struct element *non_inherit_elem) | |
178 | { | |
179 | u8 id_len, ext_id_len, i, loop_len, id; | |
180 | const u8 *list; | |
181 | ||
182 | if (elem->id == WLAN_EID_MULTIPLE_BSSID) | |
183 | return false; | |
891d4d58 BB |
184 | |
185 | if (elem->id == WLAN_EID_EXTENSION && elem->datalen > 1 && | |
186 | elem->data[0] == WLAN_EID_EXT_EHT_MULTI_LINK) | |
187 | return false; | |
f7dacfb1 SS |
188 | |
189 | if (!non_inherit_elem || non_inherit_elem->datalen < 2) | |
190 | return true; | |
191 | ||
192 | /* | |
193 | * non inheritance element format is: | |
194 | * ext ID (56) | IDs list len | list | extension IDs list len | list | |
195 | * Both lists are optional. Both lengths are mandatory. | |
196 | * This means valid length is: | |
197 | * elem_len = 1 (extension ID) + 2 (list len fields) + list lengths | |
198 | */ | |
199 | id_len = non_inherit_elem->data[1]; | |
200 | if (non_inherit_elem->datalen < 3 + id_len) | |
201 | return true; | |
202 | ||
203 | ext_id_len = non_inherit_elem->data[2 + id_len]; | |
204 | if (non_inherit_elem->datalen < 3 + id_len + ext_id_len) | |
205 | return true; | |
206 | ||
207 | if (elem->id == WLAN_EID_EXTENSION) { | |
208 | if (!ext_id_len) | |
209 | return true; | |
210 | loop_len = ext_id_len; | |
211 | list = &non_inherit_elem->data[3 + id_len]; | |
212 | id = elem->data[0]; | |
213 | } else { | |
214 | if (!id_len) | |
215 | return true; | |
216 | loop_len = id_len; | |
217 | list = &non_inherit_elem->data[2]; | |
218 | id = elem->id; | |
219 | } | |
220 | ||
221 | for (i = 0; i < loop_len; i++) { | |
222 | if (list[i] == id) | |
223 | return false; | |
224 | } | |
225 | ||
226 | return true; | |
227 | } | |
228 | EXPORT_SYMBOL(cfg80211_is_element_inherited); | |
229 | ||
dfd9aa3e BB |
230 | static size_t cfg80211_copy_elem_with_frags(const struct element *elem, |
231 | const u8 *ie, size_t ie_len, | |
232 | u8 **pos, u8 *buf, size_t buf_len) | |
0b8fb823 | 233 | { |
dfd9aa3e BB |
234 | if (WARN_ON((u8 *)elem < ie || elem->data > ie + ie_len || |
235 | elem->data + elem->datalen > ie + ie_len)) | |
236 | return 0; | |
0b8fb823 | 237 | |
dfd9aa3e | 238 | if (elem->datalen + 2 > buf + buf_len - *pos) |
0b8fb823 | 239 | return 0; |
0b8fb823 | 240 | |
dfd9aa3e BB |
241 | memcpy(*pos, elem, elem->datalen + 2); |
242 | *pos += elem->datalen + 2; | |
0b8fb823 | 243 | |
dfd9aa3e BB |
244 | /* Finish if it is not fragmented */ |
245 | if (elem->datalen != 255) | |
246 | return *pos - buf; | |
247 | ||
248 | ie_len = ie + ie_len - elem->data - elem->datalen; | |
249 | ie = (const u8 *)elem->data + elem->datalen; | |
250 | ||
251 | for_each_element(elem, ie, ie_len) { | |
252 | if (elem->id != WLAN_EID_FRAGMENT) | |
253 | break; | |
254 | ||
255 | if (elem->datalen + 2 > buf + buf_len - *pos) | |
256 | return 0; | |
257 | ||
258 | memcpy(*pos, elem, elem->datalen + 2); | |
259 | *pos += elem->datalen + 2; | |
260 | ||
261 | if (elem->datalen != 255) | |
262 | break; | |
0b8fb823 PX |
263 | } |
264 | ||
dfd9aa3e BB |
265 | return *pos - buf; |
266 | } | |
f7dacfb1 | 267 | |
9d027a35 BB |
268 | VISIBLE_IF_CFG80211_KUNIT size_t |
269 | cfg80211_gen_new_ie(const u8 *ie, size_t ielen, | |
270 | const u8 *subie, size_t subie_len, | |
271 | u8 *new_ie, size_t new_ie_len) | |
dfd9aa3e BB |
272 | { |
273 | const struct element *non_inherit_elem, *parent, *sub; | |
274 | u8 *pos = new_ie; | |
275 | u8 id, ext_id; | |
276 | unsigned int match_len; | |
277 | ||
278 | non_inherit_elem = cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE, | |
279 | subie, subie_len); | |
280 | ||
281 | /* We copy the elements one by one from the parent to the generated | |
282 | * elements. | |
283 | * If they are not inherited (included in subie or in the non | |
284 | * inheritance element), then we copy all occurrences the first time | |
285 | * we see this element type. | |
0b8fb823 | 286 | */ |
dfd9aa3e BB |
287 | for_each_element(parent, ie, ielen) { |
288 | if (parent->id == WLAN_EID_FRAGMENT) | |
0b8fb823 | 289 | continue; |
dfd9aa3e BB |
290 | |
291 | if (parent->id == WLAN_EID_EXTENSION) { | |
292 | if (parent->datalen < 1) | |
293 | continue; | |
294 | ||
295 | id = WLAN_EID_EXTENSION; | |
296 | ext_id = parent->data[0]; | |
297 | match_len = 1; | |
298 | } else { | |
299 | id = parent->id; | |
300 | match_len = 0; | |
0b8fb823 PX |
301 | } |
302 | ||
dfd9aa3e BB |
303 | /* Find first occurrence in subie */ |
304 | sub = cfg80211_find_elem_match(id, subie, subie_len, | |
305 | &ext_id, match_len, 0); | |
c17fe043 | 306 | |
dfd9aa3e BB |
307 | /* Copy from parent if not in subie and inherited */ |
308 | if (!sub && | |
309 | cfg80211_is_element_inherited(parent, non_inherit_elem)) { | |
310 | if (!cfg80211_copy_elem_with_frags(parent, | |
311 | ie, ielen, | |
312 | &pos, new_ie, | |
313 | new_ie_len)) | |
314 | return 0; | |
f7dacfb1 | 315 | |
dfd9aa3e | 316 | continue; |
0b8fb823 PX |
317 | } |
318 | ||
dfd9aa3e BB |
319 | /* Already copied if an earlier element had the same type */ |
320 | if (cfg80211_find_elem_match(id, ie, (u8 *)parent - ie, | |
321 | &ext_id, match_len, 0)) | |
322 | continue; | |
0b8fb823 | 323 | |
dfd9aa3e BB |
324 | /* Not inheriting, copy all similar elements from subie */ |
325 | while (sub) { | |
326 | if (!cfg80211_copy_elem_with_frags(sub, | |
327 | subie, subie_len, | |
328 | &pos, new_ie, | |
329 | new_ie_len)) | |
330 | return 0; | |
331 | ||
332 | sub = cfg80211_find_elem_match(id, | |
333 | sub->data + sub->datalen, | |
334 | subie_len + subie - | |
335 | (sub->data + | |
336 | sub->datalen), | |
337 | &ext_id, match_len, 0); | |
338 | } | |
0b8fb823 PX |
339 | } |
340 | ||
dfd9aa3e BB |
341 | /* The above misses elements that are included in subie but not in the |
342 | * parent, so do a pass over subie and append those. | |
343 | * Skip the non-tx BSSID caps and non-inheritance element. | |
0b8fb823 | 344 | */ |
dfd9aa3e BB |
345 | for_each_element(sub, subie, subie_len) { |
346 | if (sub->id == WLAN_EID_NON_TX_BSSID_CAP) | |
347 | continue; | |
348 | ||
349 | if (sub->id == WLAN_EID_FRAGMENT) | |
350 | continue; | |
351 | ||
352 | if (sub->id == WLAN_EID_EXTENSION) { | |
353 | if (sub->datalen < 1) | |
354 | continue; | |
355 | ||
356 | id = WLAN_EID_EXTENSION; | |
357 | ext_id = sub->data[0]; | |
358 | match_len = 1; | |
359 | ||
360 | if (ext_id == WLAN_EID_EXT_NON_INHERITANCE) | |
361 | continue; | |
362 | } else { | |
363 | id = sub->id; | |
364 | match_len = 0; | |
0b8fb823 | 365 | } |
dfd9aa3e BB |
366 | |
367 | /* Processed if one was included in the parent */ | |
368 | if (cfg80211_find_elem_match(id, ie, ielen, | |
369 | &ext_id, match_len, 0)) | |
370 | continue; | |
371 | ||
372 | if (!cfg80211_copy_elem_with_frags(sub, subie, subie_len, | |
373 | &pos, new_ie, new_ie_len)) | |
374 | return 0; | |
0b8fb823 PX |
375 | } |
376 | ||
0b8fb823 PX |
377 | return pos - new_ie; |
378 | } | |
9d027a35 | 379 | EXPORT_SYMBOL_IF_CFG80211_KUNIT(cfg80211_gen_new_ie); |
0b8fb823 PX |
380 | |
381 | static bool is_bss(struct cfg80211_bss *a, const u8 *bssid, | |
382 | const u8 *ssid, size_t ssid_len) | |
383 | { | |
384 | const struct cfg80211_bss_ies *ies; | |
a3eca817 | 385 | const struct element *ssid_elem; |
0b8fb823 PX |
386 | |
387 | if (bssid && !ether_addr_equal(a->bssid, bssid)) | |
388 | return false; | |
389 | ||
390 | if (!ssid) | |
391 | return true; | |
392 | ||
393 | ies = rcu_access_pointer(a->ies); | |
394 | if (!ies) | |
395 | return false; | |
a3eca817 JB |
396 | ssid_elem = cfg80211_find_elem(WLAN_EID_SSID, ies->data, ies->len); |
397 | if (!ssid_elem) | |
0b8fb823 | 398 | return false; |
a3eca817 | 399 | if (ssid_elem->datalen != ssid_len) |
0b8fb823 | 400 | return false; |
a3eca817 | 401 | return memcmp(ssid_elem->data, ssid, ssid_len) == 0; |
0b8fb823 PX |
402 | } |
403 | ||
404 | static int | |
7011ba58 SS |
405 | cfg80211_add_nontrans_list(struct cfg80211_bss *trans_bss, |
406 | struct cfg80211_bss *nontrans_bss) | |
0b8fb823 | 407 | { |
fb8b53ac | 408 | const struct element *ssid_elem; |
7011ba58 | 409 | struct cfg80211_bss *bss = NULL; |
0b8fb823 PX |
410 | |
411 | rcu_read_lock(); | |
fb8b53ac JB |
412 | ssid_elem = ieee80211_bss_get_elem(nontrans_bss, WLAN_EID_SSID); |
413 | if (!ssid_elem) { | |
0b8fb823 PX |
414 | rcu_read_unlock(); |
415 | return -EINVAL; | |
416 | } | |
0b8fb823 PX |
417 | |
418 | /* check if nontrans_bss is in the list */ | |
419 | list_for_each_entry(bss, &trans_bss->nontrans_list, nontrans_list) { | |
fb8b53ac JB |
420 | if (is_bss(bss, nontrans_bss->bssid, ssid_elem->data, |
421 | ssid_elem->datalen)) { | |
a2083eeb | 422 | rcu_read_unlock(); |
0b8fb823 | 423 | return 0; |
a2083eeb | 424 | } |
0b8fb823 PX |
425 | } |
426 | ||
a2083eeb JB |
427 | rcu_read_unlock(); |
428 | ||
bcca8520 JB |
429 | /* |
430 | * This is a bit weird - it's not on the list, but already on another | |
431 | * one! The only way that could happen is if there's some BSSID/SSID | |
432 | * shared by multiple APs in their multi-BSSID profiles, potentially | |
433 | * with hidden SSID mixed in ... ignore it. | |
434 | */ | |
435 | if (!list_empty(&nontrans_bss->nontrans_list)) | |
436 | return -EINVAL; | |
437 | ||
0b8fb823 PX |
438 | /* add to the list */ |
439 | list_add_tail(&nontrans_bss->nontrans_list, &trans_bss->nontrans_list); | |
440 | return 0; | |
441 | } | |
442 | ||
1b8ec87a | 443 | static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev, |
15d6030b SL |
444 | unsigned long expire_time) |
445 | { | |
446 | struct cfg80211_internal_bss *bss, *tmp; | |
447 | bool expired = false; | |
448 | ||
1b8ec87a | 449 | lockdep_assert_held(&rdev->bss_lock); |
4b1af479 | 450 | |
1b8ec87a | 451 | list_for_each_entry_safe(bss, tmp, &rdev->bss_list, list) { |
15d6030b SL |
452 | if (atomic_read(&bss->hold)) |
453 | continue; | |
454 | if (!time_after(expire_time, bss->ts)) | |
455 | continue; | |
456 | ||
1b8ec87a | 457 | if (__cfg80211_unlink_bss(rdev, bss)) |
776b3580 | 458 | expired = true; |
15d6030b SL |
459 | } |
460 | ||
461 | if (expired) | |
1b8ec87a | 462 | rdev->bss_generation++; |
15d6030b SL |
463 | } |
464 | ||
9853a55e JB |
465 | static bool cfg80211_bss_expire_oldest(struct cfg80211_registered_device *rdev) |
466 | { | |
467 | struct cfg80211_internal_bss *bss, *oldest = NULL; | |
468 | bool ret; | |
469 | ||
470 | lockdep_assert_held(&rdev->bss_lock); | |
471 | ||
472 | list_for_each_entry(bss, &rdev->bss_list, list) { | |
473 | if (atomic_read(&bss->hold)) | |
474 | continue; | |
475 | ||
476 | if (!list_empty(&bss->hidden_list) && | |
477 | !bss->pub.hidden_beacon_bss) | |
478 | continue; | |
479 | ||
480 | if (oldest && time_before(oldest->ts, bss->ts)) | |
481 | continue; | |
482 | oldest = bss; | |
483 | } | |
484 | ||
485 | if (WARN_ON(!oldest)) | |
486 | return false; | |
487 | ||
488 | /* | |
489 | * The callers make sure to increase rdev->bss_generation if anything | |
490 | * gets removed (and a new entry added), so there's no need to also do | |
491 | * it here. | |
492 | */ | |
493 | ||
494 | ret = __cfg80211_unlink_bss(rdev, oldest); | |
495 | WARN_ON(!ret); | |
496 | return ret; | |
497 | } | |
498 | ||
c8cb5b85 TM |
499 | static u8 cfg80211_parse_bss_param(u8 data, |
500 | struct cfg80211_colocated_ap *coloc_ap) | |
501 | { | |
502 | coloc_ap->oct_recommended = | |
503 | u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_OCT_RECOMMENDED); | |
504 | coloc_ap->same_ssid = | |
505 | u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_SAME_SSID); | |
506 | coloc_ap->multi_bss = | |
507 | u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_MULTI_BSSID); | |
508 | coloc_ap->transmitted_bssid = | |
509 | u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_TRANSMITTED_BSSID); | |
510 | coloc_ap->unsolicited_probe = | |
511 | u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_PROBE_ACTIVE); | |
512 | coloc_ap->colocated_ess = | |
513 | u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_COLOC_ESS); | |
514 | ||
515 | return u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_COLOC_AP); | |
516 | } | |
517 | ||
518 | static int cfg80211_calc_short_ssid(const struct cfg80211_bss_ies *ies, | |
519 | const struct element **elem, u32 *s_ssid) | |
520 | { | |
521 | ||
522 | *elem = cfg80211_find_elem(WLAN_EID_SSID, ies->data, ies->len); | |
523 | if (!*elem || (*elem)->datalen > IEEE80211_MAX_SSID_LEN) | |
524 | return -EINVAL; | |
525 | ||
526 | *s_ssid = ~crc32_le(~0, (*elem)->data, (*elem)->datalen); | |
527 | return 0; | |
528 | } | |
529 | ||
45d43937 BB |
530 | VISIBLE_IF_CFG80211_KUNIT void |
531 | cfg80211_free_coloc_ap_list(struct list_head *coloc_ap_list) | |
c8cb5b85 TM |
532 | { |
533 | struct cfg80211_colocated_ap *ap, *tmp_ap; | |
534 | ||
535 | list_for_each_entry_safe(ap, tmp_ap, coloc_ap_list, list) { | |
536 | list_del(&ap->list); | |
537 | kfree(ap); | |
538 | } | |
539 | } | |
679dd27b | 540 | EXPORT_SYMBOL_IF_CFG80211_KUNIT(cfg80211_free_coloc_ap_list); |
c8cb5b85 TM |
541 | |
542 | static int cfg80211_parse_ap_info(struct cfg80211_colocated_ap *entry, | |
543 | const u8 *pos, u8 length, | |
544 | const struct element *ssid_elem, | |
dc92e54c | 545 | u32 s_ssid_tmp) |
c8cb5b85 | 546 | { |
dc92e54c | 547 | u8 bss_params; |
c8cb5b85 | 548 | |
4ef2f53e IP |
549 | entry->psd_20 = IEEE80211_RNR_TBTT_PARAMS_PSD_RESERVED; |
550 | ||
dc92e54c BB |
551 | /* The length is already verified by the caller to contain bss_params */ |
552 | if (length > sizeof(struct ieee80211_tbtt_info_7_8_9)) { | |
553 | struct ieee80211_tbtt_info_ge_11 *tbtt_info = (void *)pos; | |
c8cb5b85 | 554 | |
dc92e54c BB |
555 | memcpy(entry->bssid, tbtt_info->bssid, ETH_ALEN); |
556 | entry->short_ssid = le32_to_cpu(tbtt_info->short_ssid); | |
c8cb5b85 | 557 | entry->short_ssid_valid = true; |
dc92e54c BB |
558 | |
559 | bss_params = tbtt_info->bss_params; | |
a0ed5011 BB |
560 | |
561 | /* Ignore disabled links */ | |
562 | if (length >= offsetofend(typeof(*tbtt_info), mld_params)) { | |
563 | if (le16_get_bits(tbtt_info->mld_params.params, | |
564 | IEEE80211_RNR_MLD_PARAMS_DISABLED_LINK)) | |
565 | return -EINVAL; | |
566 | } | |
4ef2f53e IP |
567 | |
568 | if (length >= offsetofend(struct ieee80211_tbtt_info_ge_11, | |
569 | psd_20)) | |
570 | entry->psd_20 = tbtt_info->psd_20; | |
dc92e54c BB |
571 | } else { |
572 | struct ieee80211_tbtt_info_7_8_9 *tbtt_info = (void *)pos; | |
573 | ||
574 | memcpy(entry->bssid, tbtt_info->bssid, ETH_ALEN); | |
575 | ||
576 | bss_params = tbtt_info->bss_params; | |
4ef2f53e IP |
577 | |
578 | if (length == offsetofend(struct ieee80211_tbtt_info_7_8_9, | |
579 | psd_20)) | |
580 | entry->psd_20 = tbtt_info->psd_20; | |
c8cb5b85 TM |
581 | } |
582 | ||
dc92e54c BB |
583 | /* ignore entries with invalid BSSID */ |
584 | if (!is_valid_ether_addr(entry->bssid)) | |
585 | return -EINVAL; | |
586 | ||
c8cb5b85 | 587 | /* skip non colocated APs */ |
dc92e54c | 588 | if (!cfg80211_parse_bss_param(bss_params, entry)) |
c8cb5b85 | 589 | return -EINVAL; |
c8cb5b85 | 590 | |
dc92e54c BB |
591 | /* no information about the short ssid. Consider the entry valid |
592 | * for now. It would later be dropped in case there are explicit | |
593 | * SSIDs that need to be matched | |
594 | */ | |
595 | if (!entry->same_ssid && !entry->short_ssid_valid) | |
596 | return 0; | |
c8cb5b85 TM |
597 | |
598 | if (entry->same_ssid) { | |
599 | entry->short_ssid = s_ssid_tmp; | |
600 | entry->short_ssid_valid = true; | |
601 | ||
602 | /* | |
603 | * This is safe because we validate datalen in | |
604 | * cfg80211_parse_colocated_ap(), before calling this | |
605 | * function. | |
606 | */ | |
dc92e54c | 607 | memcpy(&entry->ssid, &ssid_elem->data, ssid_elem->datalen); |
c8cb5b85 TM |
608 | entry->ssid_len = ssid_elem->datalen; |
609 | } | |
dc92e54c | 610 | |
c8cb5b85 TM |
611 | return 0; |
612 | } | |
613 | ||
22667035 JB |
614 | bool cfg80211_iter_rnr(const u8 *elems, size_t elems_len, |
615 | enum cfg80211_rnr_iter_ret | |
616 | (*iter)(void *data, u8 type, | |
617 | const struct ieee80211_neighbor_ap_info *info, | |
618 | const u8 *tbtt_info, u8 tbtt_info_len), | |
619 | void *iter_data) | |
c8cb5b85 | 620 | { |
6b756efc | 621 | const struct element *rnr; |
c8cb5b85 | 622 | const u8 *pos, *end; |
c8cb5b85 | 623 | |
6b756efc JB |
624 | for_each_element_id(rnr, WLAN_EID_REDUCED_NEIGHBOR_REPORT, |
625 | elems, elems_len) { | |
626 | const struct ieee80211_neighbor_ap_info *info; | |
c8cb5b85 | 627 | |
6b756efc JB |
628 | pos = rnr->data; |
629 | end = rnr->data + rnr->datalen; | |
c8cb5b85 | 630 | |
5461707a | 631 | /* RNR IE may contain more than one NEIGHBOR_AP_INFO */ |
6b756efc | 632 | while (sizeof(*info) <= end - pos) { |
5461707a | 633 | u8 length, i, count; |
6b756efc | 634 | u8 type; |
c8cb5b85 | 635 | |
6b756efc JB |
636 | info = (void *)pos; |
637 | count = u8_get_bits(info->tbtt_info_hdr, | |
638 | IEEE80211_AP_INFO_TBTT_HDR_COUNT) + | |
639 | 1; | |
640 | length = info->tbtt_info_len; | |
c8cb5b85 | 641 | |
6b756efc | 642 | pos += sizeof(*info); |
c8cb5b85 | 643 | |
6b756efc JB |
644 | if (count * length > end - pos) |
645 | return false; | |
c8cb5b85 | 646 | |
6b756efc JB |
647 | type = u8_get_bits(info->tbtt_info_hdr, |
648 | IEEE80211_AP_INFO_TBTT_HDR_TYPE); | |
c8cb5b85 | 649 | |
6b756efc JB |
650 | for (i = 0; i < count; i++) { |
651 | switch (iter(iter_data, type, info, | |
652 | pos, length)) { | |
653 | case RNR_ITER_CONTINUE: | |
654 | break; | |
655 | case RNR_ITER_BREAK: | |
656 | return true; | |
657 | case RNR_ITER_ERROR: | |
658 | return false; | |
659 | } | |
03e7e493 | 660 | |
6b756efc | 661 | pos += length; |
5461707a | 662 | } |
6b756efc | 663 | } |
5461707a | 664 | |
6b756efc JB |
665 | if (pos != end) |
666 | return false; | |
667 | } | |
c8cb5b85 | 668 | |
6b756efc JB |
669 | return true; |
670 | } | |
22667035 | 671 | EXPORT_SYMBOL_GPL(cfg80211_iter_rnr); |
6b756efc JB |
672 | |
673 | struct colocated_ap_data { | |
674 | const struct element *ssid_elem; | |
675 | struct list_head ap_list; | |
676 | u32 s_ssid_tmp; | |
677 | int n_coloc; | |
678 | }; | |
c8cb5b85 | 679 | |
6b756efc JB |
680 | static enum cfg80211_rnr_iter_ret |
681 | cfg80211_parse_colocated_ap_iter(void *_data, u8 type, | |
682 | const struct ieee80211_neighbor_ap_info *info, | |
683 | const u8 *tbtt_info, u8 tbtt_info_len) | |
684 | { | |
685 | struct colocated_ap_data *data = _data; | |
686 | struct cfg80211_colocated_ap *entry; | |
687 | enum nl80211_band band; | |
c8cb5b85 | 688 | |
6b756efc JB |
689 | if (type != IEEE80211_TBTT_INFO_TYPE_TBTT) |
690 | return RNR_ITER_CONTINUE; | |
c8cb5b85 | 691 | |
6b756efc JB |
692 | if (!ieee80211_operating_class_to_band(info->op_class, &band)) |
693 | return RNR_ITER_CONTINUE; | |
c8cb5b85 | 694 | |
6b756efc JB |
695 | /* TBTT info must include bss param + BSSID + (short SSID or |
696 | * same_ssid bit to be set). Ignore other options, and move to | |
697 | * the next AP info | |
698 | */ | |
699 | if (band != NL80211_BAND_6GHZ || | |
700 | !(tbtt_info_len == offsetofend(struct ieee80211_tbtt_info_7_8_9, | |
701 | bss_params) || | |
702 | tbtt_info_len == sizeof(struct ieee80211_tbtt_info_7_8_9) || | |
703 | tbtt_info_len >= offsetofend(struct ieee80211_tbtt_info_ge_11, | |
704 | bss_params))) | |
705 | return RNR_ITER_CONTINUE; | |
706 | ||
707 | entry = kzalloc(sizeof(*entry) + IEEE80211_MAX_SSID_LEN, GFP_ATOMIC); | |
708 | if (!entry) | |
709 | return RNR_ITER_ERROR; | |
710 | ||
711 | entry->center_freq = | |
712 | ieee80211_channel_to_frequency(info->channel, band); | |
713 | ||
714 | if (!cfg80211_parse_ap_info(entry, tbtt_info, tbtt_info_len, | |
715 | data->ssid_elem, data->s_ssid_tmp)) { | |
716 | data->n_coloc++; | |
717 | list_add_tail(&entry->list, &data->ap_list); | |
718 | } else { | |
719 | kfree(entry); | |
720 | } | |
c8cb5b85 | 721 | |
6b756efc JB |
722 | return RNR_ITER_CONTINUE; |
723 | } | |
c8cb5b85 | 724 | |
6b756efc JB |
725 | VISIBLE_IF_CFG80211_KUNIT int |
726 | cfg80211_parse_colocated_ap(const struct cfg80211_bss_ies *ies, | |
727 | struct list_head *list) | |
728 | { | |
729 | struct colocated_ap_data data = {}; | |
730 | int ret; | |
731 | ||
732 | INIT_LIST_HEAD(&data.ap_list); | |
733 | ||
734 | ret = cfg80211_calc_short_ssid(ies, &data.ssid_elem, &data.s_ssid_tmp); | |
735 | if (ret) | |
736 | return 0; | |
737 | ||
738 | if (!cfg80211_iter_rnr(ies->data, ies->len, | |
739 | cfg80211_parse_colocated_ap_iter, &data)) { | |
740 | cfg80211_free_coloc_ap_list(&data.ap_list); | |
741 | return 0; | |
c8cb5b85 TM |
742 | } |
743 | ||
6b756efc JB |
744 | list_splice_tail(&data.ap_list, list); |
745 | return data.n_coloc; | |
c8cb5b85 | 746 | } |
679dd27b | 747 | EXPORT_SYMBOL_IF_CFG80211_KUNIT(cfg80211_parse_colocated_ap); |
c8cb5b85 TM |
748 | |
749 | static void cfg80211_scan_req_add_chan(struct cfg80211_scan_request *request, | |
750 | struct ieee80211_channel *chan, | |
751 | bool add_to_6ghz) | |
752 | { | |
753 | int i; | |
754 | u32 n_channels = request->n_channels; | |
755 | struct cfg80211_scan_6ghz_params *params = | |
756 | &request->scan_6ghz_params[request->n_6ghz_params]; | |
757 | ||
758 | for (i = 0; i < n_channels; i++) { | |
759 | if (request->channels[i] == chan) { | |
760 | if (add_to_6ghz) | |
761 | params->channel_idx = i; | |
762 | return; | |
763 | } | |
764 | } | |
765 | ||
766 | request->channels[n_channels] = chan; | |
767 | if (add_to_6ghz) | |
768 | request->scan_6ghz_params[request->n_6ghz_params].channel_idx = | |
769 | n_channels; | |
770 | ||
771 | request->n_channels++; | |
772 | } | |
773 | ||
774 | static bool cfg80211_find_ssid_match(struct cfg80211_colocated_ap *ap, | |
775 | struct cfg80211_scan_request *request) | |
776 | { | |
ba5c2523 | 777 | int i; |
c8cb5b85 TM |
778 | u32 s_ssid; |
779 | ||
780 | for (i = 0; i < request->n_ssids; i++) { | |
781 | /* wildcard ssid in the scan request */ | |
5666ee15 AS |
782 | if (!request->ssids[i].ssid_len) { |
783 | if (ap->multi_bss && !ap->transmitted_bssid) | |
784 | continue; | |
785 | ||
c8cb5b85 | 786 | return true; |
5666ee15 | 787 | } |
c8cb5b85 TM |
788 | |
789 | if (ap->ssid_len && | |
790 | ap->ssid_len == request->ssids[i].ssid_len) { | |
791 | if (!memcmp(request->ssids[i].ssid, ap->ssid, | |
792 | ap->ssid_len)) | |
793 | return true; | |
794 | } else if (ap->short_ssid_valid) { | |
795 | s_ssid = ~crc32_le(~0, request->ssids[i].ssid, | |
796 | request->ssids[i].ssid_len); | |
797 | ||
798 | if (ap->short_ssid == s_ssid) | |
799 | return true; | |
800 | } | |
801 | } | |
802 | ||
803 | return false; | |
804 | } | |
805 | ||
806 | static int cfg80211_scan_6ghz(struct cfg80211_registered_device *rdev) | |
807 | { | |
808 | u8 i; | |
809 | struct cfg80211_colocated_ap *ap; | |
810 | int n_channels, count = 0, err; | |
811 | struct cfg80211_scan_request *request, *rdev_req = rdev->scan_req; | |
812 | LIST_HEAD(coloc_ap_list); | |
d590a125 | 813 | bool need_scan_psc = true; |
c8cb5b85 TM |
814 | const struct ieee80211_sband_iftype_data *iftd; |
815 | ||
816 | rdev_req->scan_6ghz = true; | |
817 | ||
818 | if (!rdev->wiphy.bands[NL80211_BAND_6GHZ]) | |
819 | return -EOPNOTSUPP; | |
820 | ||
821 | iftd = ieee80211_get_sband_iftype_data(rdev->wiphy.bands[NL80211_BAND_6GHZ], | |
822 | rdev_req->wdev->iftype); | |
823 | if (!iftd || !iftd->he_cap.has_he) | |
824 | return -EOPNOTSUPP; | |
825 | ||
826 | n_channels = rdev->wiphy.bands[NL80211_BAND_6GHZ]->n_channels; | |
827 | ||
828 | if (rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ) { | |
829 | struct cfg80211_internal_bss *intbss; | |
830 | ||
831 | spin_lock_bh(&rdev->bss_lock); | |
832 | list_for_each_entry(intbss, &rdev->bss_list, list) { | |
833 | struct cfg80211_bss *res = &intbss->pub; | |
834 | const struct cfg80211_bss_ies *ies; | |
0fca7784 IP |
835 | const struct element *ssid_elem; |
836 | struct cfg80211_colocated_ap *entry; | |
837 | u32 s_ssid_tmp; | |
838 | int ret; | |
c8cb5b85 TM |
839 | |
840 | ies = rcu_access_pointer(res->ies); | |
841 | count += cfg80211_parse_colocated_ap(ies, | |
842 | &coloc_ap_list); | |
0fca7784 IP |
843 | |
844 | /* In case the scan request specified a specific BSSID | |
845 | * and the BSS is found and operating on 6GHz band then | |
846 | * add this AP to the collocated APs list. | |
847 | * This is relevant for ML probe requests when the lower | |
848 | * band APs have not been discovered. | |
849 | */ | |
850 | if (is_broadcast_ether_addr(rdev_req->bssid) || | |
851 | !ether_addr_equal(rdev_req->bssid, res->bssid) || | |
852 | res->channel->band != NL80211_BAND_6GHZ) | |
853 | continue; | |
854 | ||
855 | ret = cfg80211_calc_short_ssid(ies, &ssid_elem, | |
856 | &s_ssid_tmp); | |
857 | if (ret) | |
858 | continue; | |
859 | ||
860 | entry = kzalloc(sizeof(*entry) + IEEE80211_MAX_SSID_LEN, | |
861 | GFP_ATOMIC); | |
862 | ||
863 | if (!entry) | |
864 | continue; | |
865 | ||
866 | memcpy(entry->bssid, res->bssid, ETH_ALEN); | |
867 | entry->short_ssid = s_ssid_tmp; | |
868 | memcpy(entry->ssid, ssid_elem->data, | |
869 | ssid_elem->datalen); | |
870 | entry->ssid_len = ssid_elem->datalen; | |
871 | entry->short_ssid_valid = true; | |
872 | entry->center_freq = res->channel->center_freq; | |
873 | ||
874 | list_add_tail(&entry->list, &coloc_ap_list); | |
875 | count++; | |
c8cb5b85 TM |
876 | } |
877 | spin_unlock_bh(&rdev->bss_lock); | |
878 | } | |
879 | ||
880 | request = kzalloc(struct_size(request, channels, n_channels) + | |
52bb2052 IP |
881 | sizeof(*request->scan_6ghz_params) * count + |
882 | sizeof(*request->ssids) * rdev_req->n_ssids, | |
c8cb5b85 TM |
883 | GFP_KERNEL); |
884 | if (!request) { | |
885 | cfg80211_free_coloc_ap_list(&coloc_ap_list); | |
886 | return -ENOMEM; | |
887 | } | |
888 | ||
889 | *request = *rdev_req; | |
890 | request->n_channels = 0; | |
891 | request->scan_6ghz_params = | |
892 | (void *)&request->channels[n_channels]; | |
893 | ||
894 | /* | |
d590a125 AB |
895 | * PSC channels should not be scanned in case of direct scan with 1 SSID |
896 | * and at least one of the reported co-located APs with same SSID | |
897 | * indicating that all APs in the same ESS are co-located | |
c8cb5b85 | 898 | */ |
d590a125 | 899 | if (count && request->n_ssids == 1 && request->ssids[0].ssid_len) { |
c8cb5b85 | 900 | list_for_each_entry(ap, &coloc_ap_list, list) { |
d590a125 AB |
901 | if (ap->colocated_ess && |
902 | cfg80211_find_ssid_match(ap, request)) { | |
903 | need_scan_psc = false; | |
c8cb5b85 TM |
904 | break; |
905 | } | |
906 | } | |
c8cb5b85 TM |
907 | } |
908 | ||
909 | /* | |
910 | * add to the scan request the channels that need to be scanned | |
911 | * regardless of the collocated APs (PSC channels or all channels | |
912 | * in case that NL80211_SCAN_FLAG_COLOCATED_6GHZ is not set) | |
913 | */ | |
914 | for (i = 0; i < rdev_req->n_channels; i++) { | |
915 | if (rdev_req->channels[i]->band == NL80211_BAND_6GHZ && | |
916 | ((need_scan_psc && | |
917 | cfg80211_channel_is_psc(rdev_req->channels[i])) || | |
918 | !(rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ))) { | |
919 | cfg80211_scan_req_add_chan(request, | |
920 | rdev_req->channels[i], | |
921 | false); | |
922 | } | |
923 | } | |
924 | ||
925 | if (!(rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ)) | |
926 | goto skip; | |
927 | ||
928 | list_for_each_entry(ap, &coloc_ap_list, list) { | |
929 | bool found = false; | |
930 | struct cfg80211_scan_6ghz_params *scan_6ghz_params = | |
931 | &request->scan_6ghz_params[request->n_6ghz_params]; | |
932 | struct ieee80211_channel *chan = | |
933 | ieee80211_get_channel(&rdev->wiphy, ap->center_freq); | |
934 | ||
935 | if (!chan || chan->flags & IEEE80211_CHAN_DISABLED) | |
936 | continue; | |
937 | ||
938 | for (i = 0; i < rdev_req->n_channels; i++) { | |
939 | if (rdev_req->channels[i] == chan) | |
940 | found = true; | |
941 | } | |
942 | ||
943 | if (!found) | |
944 | continue; | |
945 | ||
946 | if (request->n_ssids > 0 && | |
947 | !cfg80211_find_ssid_match(ap, request)) | |
948 | continue; | |
949 | ||
0914468a IP |
950 | if (!is_broadcast_ether_addr(request->bssid) && |
951 | !ether_addr_equal(request->bssid, ap->bssid)) | |
952 | continue; | |
953 | ||
5666ee15 AS |
954 | if (!request->n_ssids && ap->multi_bss && !ap->transmitted_bssid) |
955 | continue; | |
956 | ||
c8cb5b85 TM |
957 | cfg80211_scan_req_add_chan(request, chan, true); |
958 | memcpy(scan_6ghz_params->bssid, ap->bssid, ETH_ALEN); | |
959 | scan_6ghz_params->short_ssid = ap->short_ssid; | |
960 | scan_6ghz_params->short_ssid_valid = ap->short_ssid_valid; | |
961 | scan_6ghz_params->unsolicited_probe = ap->unsolicited_probe; | |
4ef2f53e | 962 | scan_6ghz_params->psd_20 = ap->psd_20; |
c8cb5b85 TM |
963 | |
964 | /* | |
965 | * If a PSC channel is added to the scan and 'need_scan_psc' is | |
966 | * set to false, then all the APs that the scan logic is | |
967 | * interested with on the channel are collocated and thus there | |
968 | * is no need to perform the initial PSC channel listen. | |
969 | */ | |
970 | if (cfg80211_channel_is_psc(chan) && !need_scan_psc) | |
971 | scan_6ghz_params->psc_no_listen = true; | |
972 | ||
973 | request->n_6ghz_params++; | |
974 | } | |
975 | ||
976 | skip: | |
977 | cfg80211_free_coloc_ap_list(&coloc_ap_list); | |
978 | ||
979 | if (request->n_channels) { | |
980 | struct cfg80211_scan_request *old = rdev->int_scan_req; | |
c8cb5b85 TM |
981 | rdev->int_scan_req = request; |
982 | ||
52bb2052 IP |
983 | /* |
984 | * Add the ssids from the parent scan request to the new scan | |
985 | * request, so the driver would be able to use them in its | |
986 | * probe requests to discover hidden APs on PSC channels. | |
987 | */ | |
988 | request->ssids = (void *)&request->channels[request->n_channels]; | |
989 | request->n_ssids = rdev_req->n_ssids; | |
990 | memcpy(request->ssids, rdev_req->ssids, sizeof(*request->ssids) * | |
991 | request->n_ssids); | |
992 | ||
c8cb5b85 TM |
993 | /* |
994 | * If this scan follows a previous scan, save the scan start | |
995 | * info from the first part of the scan | |
996 | */ | |
997 | if (old) | |
998 | rdev->int_scan_req->info = old->info; | |
999 | ||
1000 | err = rdev_scan(rdev, request); | |
1001 | if (err) { | |
1002 | rdev->int_scan_req = old; | |
1003 | kfree(request); | |
1004 | } else { | |
1005 | kfree(old); | |
1006 | } | |
1007 | ||
1008 | return err; | |
1009 | } | |
1010 | ||
1011 | kfree(request); | |
1012 | return -EINVAL; | |
1013 | } | |
1014 | ||
1015 | int cfg80211_scan(struct cfg80211_registered_device *rdev) | |
1016 | { | |
1017 | struct cfg80211_scan_request *request; | |
1018 | struct cfg80211_scan_request *rdev_req = rdev->scan_req; | |
1019 | u32 n_channels = 0, idx, i; | |
1020 | ||
1021 | if (!(rdev->wiphy.flags & WIPHY_FLAG_SPLIT_SCAN_6GHZ)) | |
1022 | return rdev_scan(rdev, rdev_req); | |
1023 | ||
1024 | for (i = 0; i < rdev_req->n_channels; i++) { | |
1025 | if (rdev_req->channels[i]->band != NL80211_BAND_6GHZ) | |
1026 | n_channels++; | |
1027 | } | |
1028 | ||
1029 | if (!n_channels) | |
1030 | return cfg80211_scan_6ghz(rdev); | |
1031 | ||
1032 | request = kzalloc(struct_size(request, channels, n_channels), | |
1033 | GFP_KERNEL); | |
1034 | if (!request) | |
1035 | return -ENOMEM; | |
1036 | ||
1037 | *request = *rdev_req; | |
1038 | request->n_channels = n_channels; | |
1039 | ||
1040 | for (i = idx = 0; i < rdev_req->n_channels; i++) { | |
1041 | if (rdev_req->channels[i]->band != NL80211_BAND_6GHZ) | |
1042 | request->channels[idx++] = rdev_req->channels[i]; | |
1043 | } | |
1044 | ||
1045 | rdev_req->scan_6ghz = false; | |
1046 | rdev->int_scan_req = request; | |
1047 | return rdev_scan(rdev, request); | |
1048 | } | |
1049 | ||
f9d15d16 JB |
1050 | void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, |
1051 | bool send_message) | |
2a519311 | 1052 | { |
c8cb5b85 | 1053 | struct cfg80211_scan_request *request, *rdev_req; |
fd014284 | 1054 | struct wireless_dev *wdev; |
f9d15d16 | 1055 | struct sk_buff *msg; |
3d23e349 | 1056 | #ifdef CONFIG_CFG80211_WEXT |
2a519311 JB |
1057 | union iwreq_data wrqu; |
1058 | #endif | |
1059 | ||
a05829a7 | 1060 | lockdep_assert_held(&rdev->wiphy.mtx); |
01a0ac41 | 1061 | |
f9d15d16 | 1062 | if (rdev->scan_msg) { |
505a2e88 | 1063 | nl80211_send_scan_msg(rdev, rdev->scan_msg); |
f9d15d16 JB |
1064 | rdev->scan_msg = NULL; |
1065 | return; | |
1066 | } | |
667503dd | 1067 | |
c8cb5b85 TM |
1068 | rdev_req = rdev->scan_req; |
1069 | if (!rdev_req) | |
01a0ac41 JB |
1070 | return; |
1071 | ||
c8cb5b85 TM |
1072 | wdev = rdev_req->wdev; |
1073 | request = rdev->int_scan_req ? rdev->int_scan_req : rdev_req; | |
1074 | ||
1075 | if (wdev_running(wdev) && | |
1076 | (rdev->wiphy.flags & WIPHY_FLAG_SPLIT_SCAN_6GHZ) && | |
1077 | !rdev_req->scan_6ghz && !request->info.aborted && | |
1078 | !cfg80211_scan_6ghz(rdev)) | |
1079 | return; | |
2a519311 | 1080 | |
6829c878 JB |
1081 | /* |
1082 | * This must be before sending the other events! | |
1083 | * Otherwise, wpa_supplicant gets completely confused with | |
1084 | * wext events. | |
1085 | */ | |
fd014284 JB |
1086 | if (wdev->netdev) |
1087 | cfg80211_sme_scan_done(wdev->netdev); | |
6829c878 | 1088 | |
1d76250b | 1089 | if (!request->info.aborted && |
f9d15d16 JB |
1090 | request->flags & NL80211_SCAN_FLAG_FLUSH) { |
1091 | /* flush entries from previous scans */ | |
1092 | spin_lock_bh(&rdev->bss_lock); | |
1093 | __cfg80211_bss_expire(rdev, request->scan_start); | |
1094 | spin_unlock_bh(&rdev->bss_lock); | |
15d6030b | 1095 | } |
2a519311 | 1096 | |
1d76250b | 1097 | msg = nl80211_build_scan_msg(rdev, wdev, request->info.aborted); |
f9d15d16 | 1098 | |
3d23e349 | 1099 | #ifdef CONFIG_CFG80211_WEXT |
1d76250b | 1100 | if (wdev->netdev && !request->info.aborted) { |
2a519311 JB |
1101 | memset(&wrqu, 0, sizeof(wrqu)); |
1102 | ||
fd014284 | 1103 | wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL); |
2a519311 JB |
1104 | } |
1105 | #endif | |
1106 | ||
1160dfa1 | 1107 | dev_put(wdev->netdev); |
2a519311 | 1108 | |
c8cb5b85 TM |
1109 | kfree(rdev->int_scan_req); |
1110 | rdev->int_scan_req = NULL; | |
1111 | ||
1112 | kfree(rdev->scan_req); | |
36e6fea8 | 1113 | rdev->scan_req = NULL; |
f9d15d16 JB |
1114 | |
1115 | if (!send_message) | |
1116 | rdev->scan_msg = msg; | |
1117 | else | |
505a2e88 | 1118 | nl80211_send_scan_msg(rdev, msg); |
2a519311 | 1119 | } |
667503dd | 1120 | |
fe0af9fe | 1121 | void __cfg80211_scan_done(struct wiphy *wiphy, struct wiphy_work *wk) |
36e6fea8 | 1122 | { |
fe0af9fe | 1123 | ___cfg80211_scan_done(wiphy_to_rdev(wiphy), true); |
36e6fea8 JB |
1124 | } |
1125 | ||
1d76250b AS |
1126 | void cfg80211_scan_done(struct cfg80211_scan_request *request, |
1127 | struct cfg80211_scan_info *info) | |
667503dd | 1128 | { |
c8cb5b85 TM |
1129 | struct cfg80211_scan_info old_info = request->info; |
1130 | ||
1d76250b | 1131 | trace_cfg80211_scan_done(request, info); |
c8cb5b85 TM |
1132 | WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req && |
1133 | request != wiphy_to_rdev(request->wiphy)->int_scan_req); | |
667503dd | 1134 | |
1d76250b | 1135 | request->info = *info; |
c8cb5b85 TM |
1136 | |
1137 | /* | |
1138 | * In case the scan is split, the scan_start_tsf and tsf_bssid should | |
1139 | * be of the first part. In such a case old_info.scan_start_tsf should | |
1140 | * be non zero. | |
1141 | */ | |
1142 | if (request->scan_6ghz && old_info.scan_start_tsf) { | |
1143 | request->info.scan_start_tsf = old_info.scan_start_tsf; | |
1144 | memcpy(request->info.tsf_bssid, old_info.tsf_bssid, | |
1145 | sizeof(request->info.tsf_bssid)); | |
1146 | } | |
1147 | ||
5fe231e8 | 1148 | request->notified = true; |
fe0af9fe JB |
1149 | wiphy_work_queue(request->wiphy, |
1150 | &wiphy_to_rdev(request->wiphy)->scan_done_wk); | |
667503dd | 1151 | } |
2a519311 JB |
1152 | EXPORT_SYMBOL(cfg80211_scan_done); |
1153 | ||
ca986ad9 AVS |
1154 | void cfg80211_add_sched_scan_req(struct cfg80211_registered_device *rdev, |
1155 | struct cfg80211_sched_scan_request *req) | |
1156 | { | |
a05829a7 | 1157 | lockdep_assert_held(&rdev->wiphy.mtx); |
ca986ad9 AVS |
1158 | |
1159 | list_add_rcu(&req->list, &rdev->sched_scan_req_list); | |
1160 | } | |
1161 | ||
1162 | static void cfg80211_del_sched_scan_req(struct cfg80211_registered_device *rdev, | |
1163 | struct cfg80211_sched_scan_request *req) | |
1164 | { | |
a05829a7 | 1165 | lockdep_assert_held(&rdev->wiphy.mtx); |
ca986ad9 AVS |
1166 | |
1167 | list_del_rcu(&req->list); | |
1168 | kfree_rcu(req, rcu_head); | |
1169 | } | |
1170 | ||
1171 | static struct cfg80211_sched_scan_request * | |
1172 | cfg80211_find_sched_scan_req(struct cfg80211_registered_device *rdev, u64 reqid) | |
1173 | { | |
1174 | struct cfg80211_sched_scan_request *pos; | |
1175 | ||
3ee9306b | 1176 | list_for_each_entry_rcu(pos, &rdev->sched_scan_req_list, list, |
a05829a7 | 1177 | lockdep_is_held(&rdev->wiphy.mtx)) { |
ca986ad9 AVS |
1178 | if (pos->reqid == reqid) |
1179 | return pos; | |
1180 | } | |
b34939b9 | 1181 | return NULL; |
ca986ad9 AVS |
1182 | } |
1183 | ||
1184 | /* | |
1185 | * Determines if a scheduled scan request can be handled. When a legacy | |
1186 | * scheduled scan is running no other scheduled scan is allowed regardless | |
1187 | * whether the request is for legacy or multi-support scan. When a multi-support | |
1188 | * scheduled scan is running a request for legacy scan is not allowed. In this | |
1189 | * case a request for multi-support scan can be handled if resources are | |
1190 | * available, ie. struct wiphy::max_sched_scan_reqs limit is not yet reached. | |
1191 | */ | |
1192 | int cfg80211_sched_scan_req_possible(struct cfg80211_registered_device *rdev, | |
1193 | bool want_multi) | |
1194 | { | |
1195 | struct cfg80211_sched_scan_request *pos; | |
1196 | int i = 0; | |
1197 | ||
1198 | list_for_each_entry(pos, &rdev->sched_scan_req_list, list) { | |
1199 | /* request id zero means legacy in progress */ | |
1200 | if (!i && !pos->reqid) | |
1201 | return -EINPROGRESS; | |
1202 | i++; | |
1203 | } | |
1204 | ||
1205 | if (i) { | |
1206 | /* no legacy allowed when multi request(s) are active */ | |
1207 | if (!want_multi) | |
1208 | return -EINPROGRESS; | |
1209 | ||
1210 | /* resource limit reached */ | |
1211 | if (i == rdev->wiphy.max_sched_scan_reqs) | |
1212 | return -ENOSPC; | |
1213 | } | |
1214 | return 0; | |
1215 | } | |
1216 | ||
b34939b9 | 1217 | void cfg80211_sched_scan_results_wk(struct work_struct *work) |
807f8a8c LC |
1218 | { |
1219 | struct cfg80211_registered_device *rdev; | |
b34939b9 | 1220 | struct cfg80211_sched_scan_request *req, *tmp; |
807f8a8c | 1221 | |
b34939b9 AVS |
1222 | rdev = container_of(work, struct cfg80211_registered_device, |
1223 | sched_scan_res_wk); | |
807f8a8c | 1224 | |
a05829a7 | 1225 | wiphy_lock(&rdev->wiphy); |
b34939b9 AVS |
1226 | list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) { |
1227 | if (req->report_results) { | |
1228 | req->report_results = false; | |
1229 | if (req->flags & NL80211_SCAN_FLAG_FLUSH) { | |
1230 | /* flush entries from previous scans */ | |
1231 | spin_lock_bh(&rdev->bss_lock); | |
1232 | __cfg80211_bss_expire(rdev, req->scan_start); | |
1233 | spin_unlock_bh(&rdev->bss_lock); | |
1234 | req->scan_start = jiffies; | |
1235 | } | |
1236 | nl80211_send_sched_scan(req, | |
1237 | NL80211_CMD_SCHED_SCAN_RESULTS); | |
15d6030b | 1238 | } |
15d6030b | 1239 | } |
a05829a7 | 1240 | wiphy_unlock(&rdev->wiphy); |
807f8a8c LC |
1241 | } |
1242 | ||
b34939b9 | 1243 | void cfg80211_sched_scan_results(struct wiphy *wiphy, u64 reqid) |
807f8a8c | 1244 | { |
ca986ad9 AVS |
1245 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
1246 | struct cfg80211_sched_scan_request *request; | |
1247 | ||
b34939b9 | 1248 | trace_cfg80211_sched_scan_results(wiphy, reqid); |
807f8a8c | 1249 | /* ignore if we're not scanning */ |
31a60ed1 | 1250 | |
1b57b621 | 1251 | rcu_read_lock(); |
b34939b9 AVS |
1252 | request = cfg80211_find_sched_scan_req(rdev, reqid); |
1253 | if (request) { | |
1254 | request->report_results = true; | |
1255 | queue_work(cfg80211_wq, &rdev->sched_scan_res_wk); | |
1256 | } | |
1b57b621 | 1257 | rcu_read_unlock(); |
807f8a8c LC |
1258 | } |
1259 | EXPORT_SYMBOL(cfg80211_sched_scan_results); | |
1260 | ||
a05829a7 | 1261 | void cfg80211_sched_scan_stopped_locked(struct wiphy *wiphy, u64 reqid) |
807f8a8c | 1262 | { |
f26cbf40 | 1263 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
807f8a8c | 1264 | |
a05829a7 | 1265 | lockdep_assert_held(&wiphy->mtx); |
792e6aa7 | 1266 | |
b34939b9 | 1267 | trace_cfg80211_sched_scan_stopped(wiphy, reqid); |
4ee3e063 | 1268 | |
b34939b9 | 1269 | __cfg80211_stop_sched_scan(rdev, reqid, true); |
792e6aa7 | 1270 | } |
a05829a7 | 1271 | EXPORT_SYMBOL(cfg80211_sched_scan_stopped_locked); |
792e6aa7 | 1272 | |
b34939b9 | 1273 | void cfg80211_sched_scan_stopped(struct wiphy *wiphy, u64 reqid) |
792e6aa7 | 1274 | { |
a05829a7 JB |
1275 | wiphy_lock(wiphy); |
1276 | cfg80211_sched_scan_stopped_locked(wiphy, reqid); | |
1277 | wiphy_unlock(wiphy); | |
807f8a8c | 1278 | } |
807f8a8c LC |
1279 | EXPORT_SYMBOL(cfg80211_sched_scan_stopped); |
1280 | ||
ca986ad9 AVS |
1281 | int cfg80211_stop_sched_scan_req(struct cfg80211_registered_device *rdev, |
1282 | struct cfg80211_sched_scan_request *req, | |
1283 | bool driver_initiated) | |
807f8a8c | 1284 | { |
a05829a7 | 1285 | lockdep_assert_held(&rdev->wiphy.mtx); |
807f8a8c | 1286 | |
85a9994a | 1287 | if (!driver_initiated) { |
3a3ecf1d | 1288 | int err = rdev_sched_scan_stop(rdev, req->dev, req->reqid); |
85a9994a LC |
1289 | if (err) |
1290 | return err; | |
1291 | } | |
807f8a8c | 1292 | |
ca986ad9 | 1293 | nl80211_send_sched_scan(req, NL80211_CMD_SCHED_SCAN_STOPPED); |
807f8a8c | 1294 | |
ca986ad9 | 1295 | cfg80211_del_sched_scan_req(rdev, req); |
807f8a8c | 1296 | |
3b4670ff | 1297 | return 0; |
807f8a8c LC |
1298 | } |
1299 | ||
ca986ad9 AVS |
1300 | int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev, |
1301 | u64 reqid, bool driver_initiated) | |
1302 | { | |
1303 | struct cfg80211_sched_scan_request *sched_scan_req; | |
1304 | ||
a05829a7 | 1305 | lockdep_assert_held(&rdev->wiphy.mtx); |
ca986ad9 AVS |
1306 | |
1307 | sched_scan_req = cfg80211_find_sched_scan_req(rdev, reqid); | |
b34939b9 AVS |
1308 | if (!sched_scan_req) |
1309 | return -ENOENT; | |
ca986ad9 AVS |
1310 | |
1311 | return cfg80211_stop_sched_scan_req(rdev, sched_scan_req, | |
1312 | driver_initiated); | |
1313 | } | |
1314 | ||
1b8ec87a | 1315 | void cfg80211_bss_age(struct cfg80211_registered_device *rdev, |
cb3a8eec DW |
1316 | unsigned long age_secs) |
1317 | { | |
1318 | struct cfg80211_internal_bss *bss; | |
1319 | unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); | |
1320 | ||
1b8ec87a ZG |
1321 | spin_lock_bh(&rdev->bss_lock); |
1322 | list_for_each_entry(bss, &rdev->bss_list, list) | |
cb3a8eec | 1323 | bss->ts -= age_jiffies; |
1b8ec87a | 1324 | spin_unlock_bh(&rdev->bss_lock); |
cb3a8eec DW |
1325 | } |
1326 | ||
1b8ec87a | 1327 | void cfg80211_bss_expire(struct cfg80211_registered_device *rdev) |
2a519311 | 1328 | { |
1b8ec87a | 1329 | __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE); |
2a519311 JB |
1330 | } |
1331 | ||
2f1805ea EG |
1332 | void cfg80211_bss_flush(struct wiphy *wiphy) |
1333 | { | |
1334 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); | |
1335 | ||
1336 | spin_lock_bh(&rdev->bss_lock); | |
1337 | __cfg80211_bss_expire(rdev, jiffies); | |
1338 | spin_unlock_bh(&rdev->bss_lock); | |
1339 | } | |
1340 | EXPORT_SYMBOL(cfg80211_bss_flush); | |
1341 | ||
49a68e0d JB |
1342 | const struct element * |
1343 | cfg80211_find_elem_match(u8 eid, const u8 *ies, unsigned int len, | |
1344 | const u8 *match, unsigned int match_len, | |
1345 | unsigned int match_offset) | |
2a519311 | 1346 | { |
0f3b07f0 JB |
1347 | const struct element *elem; |
1348 | ||
0f3b07f0 | 1349 | for_each_element_id(elem, eid, ies, len) { |
49a68e0d JB |
1350 | if (elem->datalen >= match_offset + match_len && |
1351 | !memcmp(elem->data + match_offset, match, match_len)) | |
1352 | return elem; | |
2a519311 | 1353 | } |
fbd05e4a LC |
1354 | |
1355 | return NULL; | |
2a519311 | 1356 | } |
49a68e0d | 1357 | EXPORT_SYMBOL(cfg80211_find_elem_match); |
2a519311 | 1358 | |
49a68e0d JB |
1359 | const struct element *cfg80211_find_vendor_elem(unsigned int oui, int oui_type, |
1360 | const u8 *ies, | |
1361 | unsigned int len) | |
0c28ec58 | 1362 | { |
49a68e0d | 1363 | const struct element *elem; |
fbd05e4a LC |
1364 | u8 match[] = { oui >> 16, oui >> 8, oui, oui_type }; |
1365 | int match_len = (oui_type < 0) ? 3 : sizeof(match); | |
0c28ec58 | 1366 | |
9e9ea439 EG |
1367 | if (WARN_ON(oui_type > 0xff)) |
1368 | return NULL; | |
1369 | ||
49a68e0d JB |
1370 | elem = cfg80211_find_elem_match(WLAN_EID_VENDOR_SPECIFIC, ies, len, |
1371 | match, match_len, 0); | |
6719429d | 1372 | |
49a68e0d | 1373 | if (!elem || elem->datalen < 4) |
fbd05e4a | 1374 | return NULL; |
6719429d | 1375 | |
49a68e0d | 1376 | return elem; |
0c28ec58 | 1377 | } |
49a68e0d | 1378 | EXPORT_SYMBOL(cfg80211_find_vendor_elem); |
0c28ec58 | 1379 | |
4593c4cb JB |
1380 | /** |
1381 | * enum bss_compare_mode - BSS compare mode | |
1382 | * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find) | |
1383 | * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode | |
1384 | * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode | |
1385 | */ | |
1386 | enum bss_compare_mode { | |
1387 | BSS_CMP_REGULAR, | |
1388 | BSS_CMP_HIDE_ZLEN, | |
1389 | BSS_CMP_HIDE_NUL, | |
1390 | }; | |
1391 | ||
dd9dfb9f | 1392 | static int cmp_bss(struct cfg80211_bss *a, |
5622f5bb | 1393 | struct cfg80211_bss *b, |
4593c4cb | 1394 | enum bss_compare_mode mode) |
dd9dfb9f | 1395 | { |
9caf0364 | 1396 | const struct cfg80211_bss_ies *a_ies, *b_ies; |
3af6341c JB |
1397 | const u8 *ie1 = NULL; |
1398 | const u8 *ie2 = NULL; | |
5622f5bb | 1399 | int i, r; |
dd9dfb9f | 1400 | |
3af6341c | 1401 | if (a->channel != b->channel) |
c1d3214d JKS |
1402 | return (b->channel->center_freq * 1000 + b->channel->freq_offset) - |
1403 | (a->channel->center_freq * 1000 + a->channel->freq_offset); | |
dd9dfb9f | 1404 | |
9caf0364 JB |
1405 | a_ies = rcu_access_pointer(a->ies); |
1406 | if (!a_ies) | |
1407 | return -1; | |
1408 | b_ies = rcu_access_pointer(b->ies); | |
1409 | if (!b_ies) | |
1410 | return 1; | |
1411 | ||
3af6341c JB |
1412 | if (WLAN_CAPABILITY_IS_STA_BSS(a->capability)) |
1413 | ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID, | |
1414 | a_ies->data, a_ies->len); | |
1415 | if (WLAN_CAPABILITY_IS_STA_BSS(b->capability)) | |
1416 | ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID, | |
1417 | b_ies->data, b_ies->len); | |
1418 | if (ie1 && ie2) { | |
1419 | int mesh_id_cmp; | |
1420 | ||
1421 | if (ie1[1] == ie2[1]) | |
1422 | mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]); | |
1423 | else | |
1424 | mesh_id_cmp = ie2[1] - ie1[1]; | |
1425 | ||
1426 | ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, | |
1427 | a_ies->data, a_ies->len); | |
1428 | ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, | |
1429 | b_ies->data, b_ies->len); | |
1430 | if (ie1 && ie2) { | |
1431 | if (mesh_id_cmp) | |
1432 | return mesh_id_cmp; | |
1433 | if (ie1[1] != ie2[1]) | |
1434 | return ie2[1] - ie1[1]; | |
1435 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); | |
1436 | } | |
1437 | } | |
1438 | ||
3af6341c JB |
1439 | r = memcmp(a->bssid, b->bssid, sizeof(a->bssid)); |
1440 | if (r) | |
1441 | return r; | |
1442 | ||
9caf0364 JB |
1443 | ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len); |
1444 | ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len); | |
dd9dfb9f | 1445 | |
5622f5bb JB |
1446 | if (!ie1 && !ie2) |
1447 | return 0; | |
1448 | ||
f94f8b16 | 1449 | /* |
5622f5bb JB |
1450 | * Note that with "hide_ssid", the function returns a match if |
1451 | * the already-present BSS ("b") is a hidden SSID beacon for | |
1452 | * the new BSS ("a"). | |
f94f8b16 | 1453 | */ |
dd9dfb9f DT |
1454 | |
1455 | /* sort missing IE before (left of) present IE */ | |
1456 | if (!ie1) | |
1457 | return -1; | |
1458 | if (!ie2) | |
1459 | return 1; | |
1460 | ||
4593c4cb JB |
1461 | switch (mode) { |
1462 | case BSS_CMP_HIDE_ZLEN: | |
1463 | /* | |
1464 | * In ZLEN mode we assume the BSS entry we're | |
1465 | * looking for has a zero-length SSID. So if | |
1466 | * the one we're looking at right now has that, | |
1467 | * return 0. Otherwise, return the difference | |
1468 | * in length, but since we're looking for the | |
1469 | * 0-length it's really equivalent to returning | |
1470 | * the length of the one we're looking at. | |
1471 | * | |
1472 | * No content comparison is needed as we assume | |
1473 | * the content length is zero. | |
1474 | */ | |
1475 | return ie2[1]; | |
1476 | case BSS_CMP_REGULAR: | |
1477 | default: | |
1478 | /* sort by length first, then by contents */ | |
1479 | if (ie1[1] != ie2[1]) | |
1480 | return ie2[1] - ie1[1]; | |
5622f5bb | 1481 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); |
4593c4cb JB |
1482 | case BSS_CMP_HIDE_NUL: |
1483 | if (ie1[1] != ie2[1]) | |
1484 | return ie2[1] - ie1[1]; | |
1485 | /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */ | |
1486 | for (i = 0; i < ie2[1]; i++) | |
1487 | if (ie2[i + 2]) | |
1488 | return -1; | |
1489 | return 0; | |
1490 | } | |
dd9dfb9f DT |
1491 | } |
1492 | ||
6eb18137 | 1493 | static bool cfg80211_bss_type_match(u16 capability, |
57fbcce3 | 1494 | enum nl80211_band band, |
6eb18137 DL |
1495 | enum ieee80211_bss_type bss_type) |
1496 | { | |
1497 | bool ret = true; | |
1498 | u16 mask, val; | |
1499 | ||
1500 | if (bss_type == IEEE80211_BSS_TYPE_ANY) | |
1501 | return ret; | |
1502 | ||
57fbcce3 | 1503 | if (band == NL80211_BAND_60GHZ) { |
6eb18137 DL |
1504 | mask = WLAN_CAPABILITY_DMG_TYPE_MASK; |
1505 | switch (bss_type) { | |
1506 | case IEEE80211_BSS_TYPE_ESS: | |
1507 | val = WLAN_CAPABILITY_DMG_TYPE_AP; | |
1508 | break; | |
1509 | case IEEE80211_BSS_TYPE_PBSS: | |
1510 | val = WLAN_CAPABILITY_DMG_TYPE_PBSS; | |
1511 | break; | |
1512 | case IEEE80211_BSS_TYPE_IBSS: | |
1513 | val = WLAN_CAPABILITY_DMG_TYPE_IBSS; | |
1514 | break; | |
1515 | default: | |
1516 | return false; | |
1517 | } | |
1518 | } else { | |
1519 | mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS; | |
1520 | switch (bss_type) { | |
1521 | case IEEE80211_BSS_TYPE_ESS: | |
1522 | val = WLAN_CAPABILITY_ESS; | |
1523 | break; | |
1524 | case IEEE80211_BSS_TYPE_IBSS: | |
1525 | val = WLAN_CAPABILITY_IBSS; | |
1526 | break; | |
1527 | case IEEE80211_BSS_TYPE_MBSS: | |
1528 | val = 0; | |
1529 | break; | |
1530 | default: | |
1531 | return false; | |
1532 | } | |
1533 | } | |
1534 | ||
1535 | ret = ((capability & mask) == val); | |
1536 | return ret; | |
1537 | } | |
1538 | ||
0e3a39b5 | 1539 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
d02a12b8 JB |
1540 | struct cfg80211_bss *__cfg80211_get_bss(struct wiphy *wiphy, |
1541 | struct ieee80211_channel *channel, | |
1542 | const u8 *bssid, | |
1543 | const u8 *ssid, size_t ssid_len, | |
1544 | enum ieee80211_bss_type bss_type, | |
1545 | enum ieee80211_privacy privacy, | |
1546 | u32 use_for) | |
2a519311 | 1547 | { |
f26cbf40 | 1548 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
2a519311 | 1549 | struct cfg80211_internal_bss *bss, *res = NULL; |
ccb6c136 | 1550 | unsigned long now = jiffies; |
6eb18137 | 1551 | int bss_privacy; |
2a519311 | 1552 | |
6eb18137 DL |
1553 | trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type, |
1554 | privacy); | |
4ee3e063 | 1555 | |
1b8ec87a | 1556 | spin_lock_bh(&rdev->bss_lock); |
2a519311 | 1557 | |
1b8ec87a | 1558 | list_for_each_entry(bss, &rdev->bss_list, list) { |
6eb18137 DL |
1559 | if (!cfg80211_bss_type_match(bss->pub.capability, |
1560 | bss->pub.channel->band, bss_type)) | |
1561 | continue; | |
1562 | ||
1563 | bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY); | |
1564 | if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) || | |
1565 | (privacy == IEEE80211_PRIVACY_OFF && bss_privacy)) | |
79420f09 | 1566 | continue; |
2a519311 JB |
1567 | if (channel && bss->pub.channel != channel) |
1568 | continue; | |
c14a7400 JB |
1569 | if (!is_valid_ether_addr(bss->pub.bssid)) |
1570 | continue; | |
d02a12b8 JB |
1571 | if ((bss->pub.use_for & use_for) != use_for) |
1572 | continue; | |
ccb6c136 JB |
1573 | /* Don't get expired BSS structs */ |
1574 | if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) && | |
1575 | !atomic_read(&bss->hold)) | |
1576 | continue; | |
2a519311 JB |
1577 | if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { |
1578 | res = bss; | |
1b8ec87a | 1579 | bss_ref_get(rdev, res); |
2a519311 JB |
1580 | break; |
1581 | } | |
1582 | } | |
1583 | ||
1b8ec87a | 1584 | spin_unlock_bh(&rdev->bss_lock); |
2a519311 JB |
1585 | if (!res) |
1586 | return NULL; | |
4ee3e063 | 1587 | trace_cfg80211_return_bss(&res->pub); |
2a519311 JB |
1588 | return &res->pub; |
1589 | } | |
d02a12b8 | 1590 | EXPORT_SYMBOL(__cfg80211_get_bss); |
2a519311 | 1591 | |
1b8ec87a | 1592 | static void rb_insert_bss(struct cfg80211_registered_device *rdev, |
2a519311 JB |
1593 | struct cfg80211_internal_bss *bss) |
1594 | { | |
1b8ec87a | 1595 | struct rb_node **p = &rdev->bss_tree.rb_node; |
2a519311 JB |
1596 | struct rb_node *parent = NULL; |
1597 | struct cfg80211_internal_bss *tbss; | |
1598 | int cmp; | |
1599 | ||
1600 | while (*p) { | |
1601 | parent = *p; | |
1602 | tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); | |
1603 | ||
4593c4cb | 1604 | cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR); |
2a519311 JB |
1605 | |
1606 | if (WARN_ON(!cmp)) { | |
1607 | /* will sort of leak this BSS */ | |
1608 | return; | |
1609 | } | |
1610 | ||
1611 | if (cmp < 0) | |
1612 | p = &(*p)->rb_left; | |
1613 | else | |
1614 | p = &(*p)->rb_right; | |
1615 | } | |
1616 | ||
1617 | rb_link_node(&bss->rbn, parent, p); | |
1b8ec87a | 1618 | rb_insert_color(&bss->rbn, &rdev->bss_tree); |
2a519311 JB |
1619 | } |
1620 | ||
1621 | static struct cfg80211_internal_bss * | |
1b8ec87a | 1622 | rb_find_bss(struct cfg80211_registered_device *rdev, |
5622f5bb | 1623 | struct cfg80211_internal_bss *res, |
4593c4cb | 1624 | enum bss_compare_mode mode) |
dd9dfb9f | 1625 | { |
1b8ec87a | 1626 | struct rb_node *n = rdev->bss_tree.rb_node; |
dd9dfb9f DT |
1627 | struct cfg80211_internal_bss *bss; |
1628 | int r; | |
1629 | ||
1630 | while (n) { | |
1631 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); | |
4593c4cb | 1632 | r = cmp_bss(&res->pub, &bss->pub, mode); |
dd9dfb9f DT |
1633 | |
1634 | if (r == 0) | |
1635 | return bss; | |
1636 | else if (r < 0) | |
1637 | n = n->rb_left; | |
1638 | else | |
1639 | n = n->rb_right; | |
1640 | } | |
1641 | ||
1642 | return NULL; | |
1643 | } | |
1644 | ||
1b8ec87a | 1645 | static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev, |
776b3580 | 1646 | struct cfg80211_internal_bss *new) |
dd9dfb9f | 1647 | { |
9caf0364 | 1648 | const struct cfg80211_bss_ies *ies; |
776b3580 JB |
1649 | struct cfg80211_internal_bss *bss; |
1650 | const u8 *ie; | |
1651 | int i, ssidlen; | |
1652 | u8 fold = 0; | |
9853a55e | 1653 | u32 n_entries = 0; |
9caf0364 | 1654 | |
776b3580 | 1655 | ies = rcu_access_pointer(new->pub.beacon_ies); |
9caf0364 | 1656 | if (WARN_ON(!ies)) |
776b3580 | 1657 | return false; |
dd9dfb9f | 1658 | |
776b3580 JB |
1659 | ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); |
1660 | if (!ie) { | |
1661 | /* nothing to do */ | |
1662 | return true; | |
1663 | } | |
1664 | ||
1665 | ssidlen = ie[1]; | |
1666 | for (i = 0; i < ssidlen; i++) | |
1667 | fold |= ie[2 + i]; | |
1668 | ||
1669 | if (fold) { | |
1670 | /* not a hidden SSID */ | |
1671 | return true; | |
1672 | } | |
1673 | ||
1674 | /* This is the bad part ... */ | |
1675 | ||
1b8ec87a | 1676 | list_for_each_entry(bss, &rdev->bss_list, list) { |
9853a55e JB |
1677 | /* |
1678 | * we're iterating all the entries anyway, so take the | |
1679 | * opportunity to validate the list length accounting | |
1680 | */ | |
1681 | n_entries++; | |
1682 | ||
776b3580 JB |
1683 | if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid)) |
1684 | continue; | |
1685 | if (bss->pub.channel != new->pub.channel) | |
1686 | continue; | |
1687 | if (rcu_access_pointer(bss->pub.beacon_ies)) | |
1688 | continue; | |
1689 | ies = rcu_access_pointer(bss->pub.ies); | |
1690 | if (!ies) | |
1691 | continue; | |
1692 | ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); | |
1693 | if (!ie) | |
1694 | continue; | |
1695 | if (ssidlen && ie[1] != ssidlen) | |
1696 | continue; | |
776b3580 JB |
1697 | if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss)) |
1698 | continue; | |
1699 | if (WARN_ON_ONCE(!list_empty(&bss->hidden_list))) | |
1700 | list_del(&bss->hidden_list); | |
1701 | /* combine them */ | |
1702 | list_add(&bss->hidden_list, &new->hidden_list); | |
1703 | bss->pub.hidden_beacon_bss = &new->pub; | |
1704 | new->refcount += bss->refcount; | |
1705 | rcu_assign_pointer(bss->pub.beacon_ies, | |
1706 | new->pub.beacon_ies); | |
1707 | } | |
1708 | ||
9853a55e JB |
1709 | WARN_ONCE(n_entries != rdev->bss_entries, |
1710 | "rdev bss entries[%d]/list[len:%d] corruption\n", | |
1711 | rdev->bss_entries, n_entries); | |
1712 | ||
776b3580 | 1713 | return true; |
dd9dfb9f DT |
1714 | } |
1715 | ||
c90b93b5 JB |
1716 | static void cfg80211_update_hidden_bsses(struct cfg80211_internal_bss *known, |
1717 | const struct cfg80211_bss_ies *new_ies, | |
1718 | const struct cfg80211_bss_ies *old_ies) | |
1719 | { | |
1720 | struct cfg80211_internal_bss *bss; | |
1721 | ||
1722 | /* Assign beacon IEs to all sub entries */ | |
1723 | list_for_each_entry(bss, &known->hidden_list, hidden_list) { | |
1724 | const struct cfg80211_bss_ies *ies; | |
1725 | ||
1726 | ies = rcu_access_pointer(bss->pub.beacon_ies); | |
1727 | WARN_ON(ies != old_ies); | |
1728 | ||
1729 | rcu_assign_pointer(bss->pub.beacon_ies, new_ies); | |
1730 | } | |
1731 | } | |
1732 | ||
177fbbcb JB |
1733 | static void cfg80211_check_stuck_ecsa(struct cfg80211_registered_device *rdev, |
1734 | struct cfg80211_internal_bss *known, | |
1735 | const struct cfg80211_bss_ies *old) | |
1736 | { | |
1737 | const struct ieee80211_ext_chansw_ie *ecsa; | |
1738 | const struct element *elem_new, *elem_old; | |
1739 | const struct cfg80211_bss_ies *new, *bcn; | |
1740 | ||
1741 | if (known->pub.proberesp_ecsa_stuck) | |
1742 | return; | |
1743 | ||
1744 | new = rcu_dereference_protected(known->pub.proberesp_ies, | |
1745 | lockdep_is_held(&rdev->bss_lock)); | |
1746 | if (WARN_ON(!new)) | |
1747 | return; | |
1748 | ||
1749 | if (new->tsf - old->tsf < USEC_PER_SEC) | |
1750 | return; | |
1751 | ||
1752 | elem_old = cfg80211_find_elem(WLAN_EID_EXT_CHANSWITCH_ANN, | |
1753 | old->data, old->len); | |
1754 | if (!elem_old) | |
1755 | return; | |
1756 | ||
1757 | elem_new = cfg80211_find_elem(WLAN_EID_EXT_CHANSWITCH_ANN, | |
1758 | new->data, new->len); | |
1759 | if (!elem_new) | |
1760 | return; | |
1761 | ||
1762 | bcn = rcu_dereference_protected(known->pub.beacon_ies, | |
1763 | lockdep_is_held(&rdev->bss_lock)); | |
1764 | if (bcn && | |
1765 | cfg80211_find_elem(WLAN_EID_EXT_CHANSWITCH_ANN, | |
1766 | bcn->data, bcn->len)) | |
1767 | return; | |
1768 | ||
1769 | if (elem_new->datalen != elem_old->datalen) | |
1770 | return; | |
1771 | if (elem_new->datalen < sizeof(struct ieee80211_ext_chansw_ie)) | |
1772 | return; | |
1773 | if (memcmp(elem_new->data, elem_old->data, elem_new->datalen)) | |
1774 | return; | |
1775 | ||
1776 | ecsa = (void *)elem_new->data; | |
1777 | ||
1778 | if (!ecsa->mode) | |
1779 | return; | |
1780 | ||
1781 | if (ecsa->new_ch_num != | |
1782 | ieee80211_frequency_to_channel(known->pub.channel->center_freq)) | |
1783 | return; | |
1784 | ||
1785 | known->pub.proberesp_ecsa_stuck = 1; | |
1786 | } | |
1787 | ||
3ab8227d SM |
1788 | static bool |
1789 | cfg80211_update_known_bss(struct cfg80211_registered_device *rdev, | |
1790 | struct cfg80211_internal_bss *known, | |
1791 | struct cfg80211_internal_bss *new, | |
1792 | bool signal_valid) | |
1793 | { | |
1794 | lockdep_assert_held(&rdev->bss_lock); | |
1795 | ||
1796 | /* Update IEs */ | |
1797 | if (rcu_access_pointer(new->pub.proberesp_ies)) { | |
1798 | const struct cfg80211_bss_ies *old; | |
1799 | ||
1800 | old = rcu_access_pointer(known->pub.proberesp_ies); | |
1801 | ||
1802 | rcu_assign_pointer(known->pub.proberesp_ies, | |
1803 | new->pub.proberesp_ies); | |
1804 | /* Override possible earlier Beacon frame IEs */ | |
1805 | rcu_assign_pointer(known->pub.ies, | |
1806 | new->pub.proberesp_ies); | |
177fbbcb JB |
1807 | if (old) { |
1808 | cfg80211_check_stuck_ecsa(rdev, known, old); | |
3ab8227d | 1809 | kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head); |
177fbbcb | 1810 | } |
f510bcc2 BB |
1811 | } |
1812 | ||
1813 | if (rcu_access_pointer(new->pub.beacon_ies)) { | |
3ab8227d | 1814 | const struct cfg80211_bss_ies *old; |
3ab8227d SM |
1815 | |
1816 | if (known->pub.hidden_beacon_bss && | |
1817 | !list_empty(&known->hidden_list)) { | |
1818 | const struct cfg80211_bss_ies *f; | |
1819 | ||
1820 | /* The known BSS struct is one of the probe | |
1821 | * response members of a group, but we're | |
1822 | * receiving a beacon (beacon_ies in the new | |
1823 | * bss is used). This can only mean that the | |
1824 | * AP changed its beacon from not having an | |
1825 | * SSID to showing it, which is confusing so | |
1826 | * drop this information. | |
1827 | */ | |
1828 | ||
1829 | f = rcu_access_pointer(new->pub.beacon_ies); | |
1830 | kfree_rcu((struct cfg80211_bss_ies *)f, rcu_head); | |
1831 | return false; | |
1832 | } | |
1833 | ||
1834 | old = rcu_access_pointer(known->pub.beacon_ies); | |
1835 | ||
1836 | rcu_assign_pointer(known->pub.beacon_ies, new->pub.beacon_ies); | |
1837 | ||
1838 | /* Override IEs if they were from a beacon before */ | |
1839 | if (old == rcu_access_pointer(known->pub.ies)) | |
1840 | rcu_assign_pointer(known->pub.ies, new->pub.beacon_ies); | |
1841 | ||
03c0ad4b JB |
1842 | cfg80211_update_hidden_bsses(known, |
1843 | rcu_access_pointer(new->pub.beacon_ies), | |
1844 | old); | |
3ab8227d SM |
1845 | |
1846 | if (old) | |
1847 | kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head); | |
1848 | } | |
1849 | ||
1850 | known->pub.beacon_interval = new->pub.beacon_interval; | |
1851 | ||
1852 | /* don't update the signal if beacon was heard on | |
1853 | * adjacent channel. | |
1854 | */ | |
1855 | if (signal_valid) | |
1856 | known->pub.signal = new->pub.signal; | |
1857 | known->pub.capability = new->pub.capability; | |
1858 | known->ts = new->ts; | |
1859 | known->ts_boottime = new->ts_boottime; | |
1860 | known->parent_tsf = new->parent_tsf; | |
1861 | known->pub.chains = new->pub.chains; | |
1862 | memcpy(known->pub.chain_signal, new->pub.chain_signal, | |
1863 | IEEE80211_MAX_CHAINS); | |
1864 | ether_addr_copy(known->parent_bssid, new->parent_bssid); | |
1865 | known->pub.max_bssid_indicator = new->pub.max_bssid_indicator; | |
1866 | known->pub.bssid_index = new->pub.bssid_index; | |
d02a12b8 JB |
1867 | known->pub.use_for &= new->pub.use_for; |
1868 | known->pub.cannot_use_reasons = new->pub.cannot_use_reasons; | |
3ab8227d SM |
1869 | |
1870 | return true; | |
1871 | } | |
1872 | ||
0e3a39b5 | 1873 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
6b7c93c1 BB |
1874 | static struct cfg80211_internal_bss * |
1875 | __cfg80211_bss_update(struct cfg80211_registered_device *rdev, | |
1876 | struct cfg80211_internal_bss *tmp, | |
1877 | bool signal_valid, unsigned long ts) | |
2a519311 JB |
1878 | { |
1879 | struct cfg80211_internal_bss *found = NULL; | |
31c5e92b | 1880 | struct cfg80211_bss_ies *ies; |
2a519311 | 1881 | |
9caf0364 | 1882 | if (WARN_ON(!tmp->pub.channel)) |
31c5e92b | 1883 | goto free_ies; |
2a519311 | 1884 | |
a3ce17d1 | 1885 | tmp->ts = ts; |
2a519311 | 1886 | |
31c5e92b BB |
1887 | if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) |
1888 | goto free_ies; | |
9caf0364 | 1889 | |
1b8ec87a | 1890 | found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR); |
2a519311 | 1891 | |
cd1658f5 | 1892 | if (found) { |
3ab8227d | 1893 | if (!cfg80211_update_known_bss(rdev, found, tmp, signal_valid)) |
6b7c93c1 | 1894 | return NULL; |
2a519311 | 1895 | } else { |
9caf0364 | 1896 | struct cfg80211_internal_bss *new; |
dd9dfb9f DT |
1897 | struct cfg80211_internal_bss *hidden; |
1898 | ||
9caf0364 JB |
1899 | /* |
1900 | * create a copy -- the "res" variable that is passed in | |
1901 | * is allocated on the stack since it's not needed in the | |
1902 | * more common case of an update | |
1903 | */ | |
1b8ec87a | 1904 | new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size, |
9caf0364 | 1905 | GFP_ATOMIC); |
31c5e92b BB |
1906 | if (!new) |
1907 | goto free_ies; | |
9caf0364 | 1908 | memcpy(new, tmp, sizeof(*new)); |
776b3580 JB |
1909 | new->refcount = 1; |
1910 | INIT_LIST_HEAD(&new->hidden_list); | |
7011ba58 | 1911 | INIT_LIST_HEAD(&new->pub.nontrans_list); |
0b780881 JB |
1912 | /* we'll set this later if it was non-NULL */ |
1913 | new->pub.transmitted_bss = NULL; | |
776b3580 JB |
1914 | |
1915 | if (rcu_access_pointer(tmp->pub.proberesp_ies)) { | |
1b8ec87a | 1916 | hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN); |
776b3580 | 1917 | if (!hidden) |
1b8ec87a | 1918 | hidden = rb_find_bss(rdev, tmp, |
776b3580 JB |
1919 | BSS_CMP_HIDE_NUL); |
1920 | if (hidden) { | |
1921 | new->pub.hidden_beacon_bss = &hidden->pub; | |
1922 | list_add(&new->hidden_list, | |
1923 | &hidden->hidden_list); | |
1924 | hidden->refcount++; | |
32af9a9e | 1925 | |
1184950e | 1926 | ies = (void *)rcu_access_pointer(new->pub.beacon_ies); |
776b3580 JB |
1927 | rcu_assign_pointer(new->pub.beacon_ies, |
1928 | hidden->pub.beacon_ies); | |
32af9a9e BB |
1929 | if (ies) |
1930 | kfree_rcu(ies, rcu_head); | |
776b3580 JB |
1931 | } |
1932 | } else { | |
1933 | /* | |
1934 | * Ok so we found a beacon, and don't have an entry. If | |
1935 | * it's a beacon with hidden SSID, we might be in for an | |
1936 | * expensive search for any probe responses that should | |
1937 | * be grouped with this beacon for updates ... | |
1938 | */ | |
1b8ec87a | 1939 | if (!cfg80211_combine_bsses(rdev, new)) { |
f9a5c358 | 1940 | bss_ref_put(rdev, new); |
6b7c93c1 | 1941 | return NULL; |
776b3580 JB |
1942 | } |
1943 | } | |
1944 | ||
9853a55e JB |
1945 | if (rdev->bss_entries >= bss_entries_limit && |
1946 | !cfg80211_bss_expire_oldest(rdev)) { | |
f9a5c358 | 1947 | bss_ref_put(rdev, new); |
6b7c93c1 | 1948 | return NULL; |
9853a55e JB |
1949 | } |
1950 | ||
a3584f56 | 1951 | /* This must be before the call to bss_ref_get */ |
0cd01efb | 1952 | if (tmp->pub.transmitted_bss) { |
0cd01efb | 1953 | new->pub.transmitted_bss = tmp->pub.transmitted_bss; |
61e41e5d | 1954 | bss_ref_get(rdev, bss_from_pub(tmp->pub.transmitted_bss)); |
a3584f56 SS |
1955 | } |
1956 | ||
1b8ec87a | 1957 | list_add_tail(&new->list, &rdev->bss_list); |
9853a55e | 1958 | rdev->bss_entries++; |
1b8ec87a | 1959 | rb_insert_bss(rdev, new); |
9caf0364 | 1960 | found = new; |
2a519311 JB |
1961 | } |
1962 | ||
1b8ec87a ZG |
1963 | rdev->bss_generation++; |
1964 | bss_ref_get(rdev, found); | |
2a519311 | 1965 | |
2a519311 | 1966 | return found; |
31c5e92b BB |
1967 | |
1968 | free_ies: | |
1969 | ies = (void *)rcu_dereference(tmp->pub.beacon_ies); | |
1970 | if (ies) | |
1971 | kfree_rcu(ies, rcu_head); | |
1972 | ies = (void *)rcu_dereference(tmp->pub.proberesp_ies); | |
1973 | if (ies) | |
1974 | kfree_rcu(ies, rcu_head); | |
1975 | ||
1976 | return NULL; | |
6b7c93c1 BB |
1977 | } |
1978 | ||
1979 | struct cfg80211_internal_bss * | |
1980 | cfg80211_bss_update(struct cfg80211_registered_device *rdev, | |
1981 | struct cfg80211_internal_bss *tmp, | |
1982 | bool signal_valid, unsigned long ts) | |
1983 | { | |
1984 | struct cfg80211_internal_bss *res; | |
1985 | ||
1986 | spin_lock_bh(&rdev->bss_lock); | |
1987 | res = __cfg80211_bss_update(rdev, tmp, signal_valid, ts); | |
1b8ec87a | 1988 | spin_unlock_bh(&rdev->bss_lock); |
6b7c93c1 BB |
1989 | |
1990 | return res; | |
2a519311 JB |
1991 | } |
1992 | ||
97981d89 | 1993 | int cfg80211_get_ies_channel_number(const u8 *ie, size_t ielen, |
6ff9efcf | 1994 | enum nl80211_band band) |
0172bb75 | 1995 | { |
75cca1fa | 1996 | const struct element *tmp; |
0172bb75 | 1997 | |
7f599aec | 1998 | if (band == NL80211_BAND_6GHZ) { |
7f599aec AB |
1999 | struct ieee80211_he_operation *he_oper; |
2000 | ||
75cca1fa JB |
2001 | tmp = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION, ie, |
2002 | ielen); | |
2003 | if (tmp && tmp->datalen >= sizeof(*he_oper) && | |
2004 | tmp->datalen >= ieee80211_he_oper_size(&tmp->data[1])) { | |
7f599aec AB |
2005 | const struct ieee80211_he_6ghz_oper *he_6ghz_oper; |
2006 | ||
75cca1fa | 2007 | he_oper = (void *)&tmp->data[1]; |
7f599aec AB |
2008 | |
2009 | he_6ghz_oper = ieee80211_he_6ghz_oper(he_oper); | |
2010 | if (!he_6ghz_oper) | |
75cca1fa | 2011 | return -1; |
7f599aec | 2012 | |
724a486c | 2013 | return he_6ghz_oper->primary; |
7f599aec AB |
2014 | } |
2015 | } else if (band == NL80211_BAND_S1GHZ) { | |
75cca1fa JB |
2016 | tmp = cfg80211_find_elem(WLAN_EID_S1G_OPERATION, ie, ielen); |
2017 | if (tmp && tmp->datalen >= sizeof(struct ieee80211_s1g_oper_ie)) { | |
2018 | struct ieee80211_s1g_oper_ie *s1gop = (void *)tmp->data; | |
66b0564d | 2019 | |
e847ffe2 | 2020 | return s1gop->oper_ch; |
66b0564d | 2021 | } |
0172bb75 | 2022 | } else { |
75cca1fa JB |
2023 | tmp = cfg80211_find_elem(WLAN_EID_DS_PARAMS, ie, ielen); |
2024 | if (tmp && tmp->datalen == 1) | |
2025 | return tmp->data[0]; | |
0172bb75 | 2026 | |
75cca1fa JB |
2027 | tmp = cfg80211_find_elem(WLAN_EID_HT_OPERATION, ie, ielen); |
2028 | if (tmp && | |
2029 | tmp->datalen >= sizeof(struct ieee80211_ht_operation)) { | |
2030 | struct ieee80211_ht_operation *htop = (void *)tmp->data; | |
2031 | ||
2032 | return htop->primary_chan; | |
0172bb75 JB |
2033 | } |
2034 | } | |
2035 | ||
75cca1fa | 2036 | return -1; |
97981d89 WG |
2037 | } |
2038 | EXPORT_SYMBOL(cfg80211_get_ies_channel_number); | |
2039 | ||
2040 | /* | |
2041 | * Update RX channel information based on the available frame payload | |
2042 | * information. This is mainly for the 2.4 GHz band where frames can be received | |
2043 | * from neighboring channels and the Beacon frames use the DSSS Parameter Set | |
2044 | * element to indicate the current (transmitting) channel, but this might also | |
2045 | * be needed on other bands if RX frequency does not match with the actual | |
7f599aec | 2046 | * operating channel of a BSS, or if the AP reports a different primary channel. |
97981d89 WG |
2047 | */ |
2048 | static struct ieee80211_channel * | |
2049 | cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen, | |
5add321c | 2050 | struct ieee80211_channel *channel) |
97981d89 WG |
2051 | { |
2052 | u32 freq; | |
2053 | int channel_number; | |
2054 | struct ieee80211_channel *alt_channel; | |
2055 | ||
7f599aec | 2056 | channel_number = cfg80211_get_ies_channel_number(ie, ielen, |
6ff9efcf | 2057 | channel->band); |
97981d89 | 2058 | |
119f94a6 JM |
2059 | if (channel_number < 0) { |
2060 | /* No channel information in frame payload */ | |
0172bb75 | 2061 | return channel; |
119f94a6 | 2062 | } |
0172bb75 | 2063 | |
934f4c7d | 2064 | freq = ieee80211_channel_to_freq_khz(channel_number, channel->band); |
7f599aec AB |
2065 | |
2066 | /* | |
fb4b441c MG |
2067 | * Frame info (beacon/prob res) is the same as received channel, |
2068 | * no need for further processing. | |
7f599aec | 2069 | */ |
fb4b441c | 2070 | if (freq == ieee80211_channel_to_khz(channel)) |
7f599aec AB |
2071 | return channel; |
2072 | ||
934f4c7d | 2073 | alt_channel = ieee80211_get_channel_khz(wiphy, freq); |
119f94a6 | 2074 | if (!alt_channel) { |
fb4b441c MG |
2075 | if (channel->band == NL80211_BAND_2GHZ || |
2076 | channel->band == NL80211_BAND_6GHZ) { | |
119f94a6 JM |
2077 | /* |
2078 | * Better not allow unexpected channels when that could | |
2079 | * be going beyond the 1-11 range (e.g., discovering | |
2080 | * BSS on channel 12 when radio is configured for | |
fb4b441c | 2081 | * channel 11) or beyond the 6 GHz channel range. |
119f94a6 JM |
2082 | */ |
2083 | return NULL; | |
2084 | } | |
2085 | ||
2086 | /* No match for the payload channel number - ignore it */ | |
2087 | return channel; | |
2088 | } | |
2089 | ||
119f94a6 JM |
2090 | /* |
2091 | * Use the channel determined through the payload channel number | |
2092 | * instead of the RX channel reported by the driver. | |
2093 | */ | |
2094 | if (alt_channel->flags & IEEE80211_CHAN_DISABLED) | |
0172bb75 | 2095 | return NULL; |
119f94a6 | 2096 | return alt_channel; |
0172bb75 JB |
2097 | } |
2098 | ||
eb142608 BB |
2099 | struct cfg80211_inform_single_bss_data { |
2100 | struct cfg80211_inform_bss *drv_data; | |
2101 | enum cfg80211_bss_frame_type ftype; | |
2481b5da | 2102 | struct ieee80211_channel *channel; |
eb142608 BB |
2103 | u8 bssid[ETH_ALEN]; |
2104 | u64 tsf; | |
2105 | u16 capability; | |
2106 | u16 beacon_interval; | |
2107 | const u8 *ie; | |
2108 | size_t ielen; | |
2109 | ||
2481b5da BB |
2110 | enum { |
2111 | BSS_SOURCE_DIRECT = 0, | |
2112 | BSS_SOURCE_MBSSID, | |
2113 | BSS_SOURCE_STA_PROFILE, | |
2114 | } bss_source; | |
2115 | /* Set if reporting bss_source != BSS_SOURCE_DIRECT */ | |
eb142608 BB |
2116 | struct cfg80211_bss *source_bss; |
2117 | u8 max_bssid_indicator; | |
2118 | u8 bssid_index; | |
d02a12b8 JB |
2119 | |
2120 | u8 use_for; | |
2121 | u64 cannot_use_reasons; | |
eb142608 BB |
2122 | }; |
2123 | ||
317bad4c JB |
2124 | static bool cfg80211_6ghz_power_type_valid(const u8 *ie, size_t ielen, |
2125 | const u32 flags) | |
2126 | { | |
2127 | const struct element *tmp; | |
2128 | struct ieee80211_he_operation *he_oper; | |
2129 | ||
2130 | tmp = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION, ie, ielen); | |
2131 | if (tmp && tmp->datalen >= sizeof(*he_oper) + 1) { | |
2132 | const struct ieee80211_he_6ghz_oper *he_6ghz_oper; | |
2133 | ||
2134 | he_oper = (void *)&tmp->data[1]; | |
2135 | he_6ghz_oper = ieee80211_he_6ghz_oper(he_oper); | |
2136 | ||
2137 | if (!he_6ghz_oper) | |
2138 | return false; | |
2139 | ||
2140 | switch (u8_get_bits(he_6ghz_oper->control, | |
2141 | IEEE80211_HE_6GHZ_OPER_CTRL_REG_INFO)) { | |
2142 | case IEEE80211_6GHZ_CTRL_REG_LPI_AP: | |
dc63b1d0 | 2143 | case IEEE80211_6GHZ_CTRL_REG_INDOOR_LPI_AP: |
317bad4c JB |
2144 | return true; |
2145 | case IEEE80211_6GHZ_CTRL_REG_SP_AP: | |
dc63b1d0 | 2146 | case IEEE80211_6GHZ_CTRL_REG_INDOOR_SP_AP: |
317bad4c JB |
2147 | return !(flags & IEEE80211_CHAN_NO_6GHZ_AFC_CLIENT); |
2148 | case IEEE80211_6GHZ_CTRL_REG_VLP_AP: | |
2149 | return !(flags & IEEE80211_CHAN_NO_6GHZ_VLP_CLIENT); | |
dc63b1d0 A |
2150 | default: |
2151 | return false; | |
317bad4c JB |
2152 | } |
2153 | } | |
2154 | return false; | |
2155 | } | |
2156 | ||
0e3a39b5 | 2157 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
0b8fb823 PX |
2158 | static struct cfg80211_bss * |
2159 | cfg80211_inform_single_bss_data(struct wiphy *wiphy, | |
eb142608 | 2160 | struct cfg80211_inform_single_bss_data *data, |
0b8fb823 | 2161 | gfp_t gfp) |
06aa7afa | 2162 | { |
0b8fb823 | 2163 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
eb142608 | 2164 | struct cfg80211_inform_bss *drv_data = data->drv_data; |
9caf0364 | 2165 | struct cfg80211_bss_ies *ies; |
3afc2167 | 2166 | struct ieee80211_channel *channel; |
7011ba58 | 2167 | struct cfg80211_internal_bss tmp = {}, *res; |
6eb18137 | 2168 | int bss_type; |
67af9811 | 2169 | bool signal_valid; |
60d7dfea | 2170 | unsigned long ts; |
06aa7afa JK |
2171 | |
2172 | if (WARN_ON(!wiphy)) | |
2173 | return NULL; | |
2174 | ||
22fe88d3 | 2175 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
eb142608 | 2176 | (drv_data->signal < 0 || drv_data->signal > 100))) |
06aa7afa JK |
2177 | return NULL; |
2178 | ||
2481b5da BB |
2179 | if (WARN_ON(data->bss_source != BSS_SOURCE_DIRECT && !data->source_bss)) |
2180 | return NULL; | |
2181 | ||
2182 | channel = data->channel; | |
2183 | if (!channel) | |
2184 | channel = cfg80211_get_bss_channel(wiphy, data->ie, data->ielen, | |
5add321c | 2185 | drv_data->chan); |
0172bb75 JB |
2186 | if (!channel) |
2187 | return NULL; | |
2188 | ||
317bad4c JB |
2189 | if (channel->band == NL80211_BAND_6GHZ && |
2190 | !cfg80211_6ghz_power_type_valid(data->ie, data->ielen, | |
2191 | channel->flags)) { | |
2192 | data->use_for = 0; | |
2193 | data->cannot_use_reasons = | |
2194 | NL80211_BSS_CANNOT_USE_6GHZ_PWR_MISMATCH; | |
2195 | } | |
2196 | ||
eb142608 | 2197 | memcpy(tmp.pub.bssid, data->bssid, ETH_ALEN); |
9caf0364 | 2198 | tmp.pub.channel = channel; |
2481b5da BB |
2199 | if (data->bss_source != BSS_SOURCE_STA_PROFILE) |
2200 | tmp.pub.signal = drv_data->signal; | |
2201 | else | |
2202 | tmp.pub.signal = 0; | |
eb142608 BB |
2203 | tmp.pub.beacon_interval = data->beacon_interval; |
2204 | tmp.pub.capability = data->capability; | |
2205 | tmp.ts_boottime = drv_data->boottime_ns; | |
2206 | tmp.parent_tsf = drv_data->parent_tsf; | |
2207 | ether_addr_copy(tmp.parent_bssid, drv_data->parent_bssid); | |
317bad4c JB |
2208 | tmp.pub.chains = drv_data->chains; |
2209 | memcpy(tmp.pub.chain_signal, drv_data->chain_signal, | |
2210 | IEEE80211_MAX_CHAINS); | |
d02a12b8 JB |
2211 | tmp.pub.use_for = data->use_for; |
2212 | tmp.pub.cannot_use_reasons = data->cannot_use_reasons; | |
eb142608 | 2213 | |
97f8df4d BB |
2214 | switch (data->bss_source) { |
2215 | case BSS_SOURCE_MBSSID: | |
eb142608 | 2216 | tmp.pub.transmitted_bss = data->source_bss; |
97f8df4d BB |
2217 | fallthrough; |
2218 | case BSS_SOURCE_STA_PROFILE: | |
eb142608 BB |
2219 | ts = bss_from_pub(data->source_bss)->ts; |
2220 | tmp.pub.bssid_index = data->bssid_index; | |
2221 | tmp.pub.max_bssid_indicator = data->max_bssid_indicator; | |
97f8df4d BB |
2222 | break; |
2223 | case BSS_SOURCE_DIRECT: | |
60d7dfea | 2224 | ts = jiffies; |
c2edd301 BB |
2225 | |
2226 | if (channel->band == NL80211_BAND_60GHZ) { | |
eb142608 BB |
2227 | bss_type = data->capability & |
2228 | WLAN_CAPABILITY_DMG_TYPE_MASK; | |
c2edd301 BB |
2229 | if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP || |
2230 | bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS) | |
2231 | regulatory_hint_found_beacon(wiphy, channel, | |
2232 | gfp); | |
2233 | } else { | |
eb142608 | 2234 | if (data->capability & WLAN_CAPABILITY_ESS) |
c2edd301 BB |
2235 | regulatory_hint_found_beacon(wiphy, channel, |
2236 | gfp); | |
2237 | } | |
97f8df4d | 2238 | break; |
0cd01efb | 2239 | } |
6e19bc4b | 2240 | |
34a6eddb | 2241 | /* |
5bc8c1f2 | 2242 | * If we do not know here whether the IEs are from a Beacon or Probe |
34a6eddb JM |
2243 | * Response frame, we need to pick one of the options and only use it |
2244 | * with the driver that does not provide the full Beacon/Probe Response | |
2245 | * frame. Use Beacon frame pointer to avoid indicating that this should | |
50521aa8 | 2246 | * override the IEs pointer should we have received an earlier |
9caf0364 | 2247 | * indication of Probe Response data. |
34a6eddb | 2248 | */ |
eb142608 | 2249 | ies = kzalloc(sizeof(*ies) + data->ielen, gfp); |
9caf0364 JB |
2250 | if (!ies) |
2251 | return NULL; | |
eb142608 BB |
2252 | ies->len = data->ielen; |
2253 | ies->tsf = data->tsf; | |
0e227084 | 2254 | ies->from_beacon = false; |
eb142608 | 2255 | memcpy(ies->data, data->ie, data->ielen); |
06aa7afa | 2256 | |
eb142608 | 2257 | switch (data->ftype) { |
5bc8c1f2 | 2258 | case CFG80211_BSS_FTYPE_BEACON: |
7e899c1d | 2259 | case CFG80211_BSS_FTYPE_S1G_BEACON: |
5bc8c1f2 | 2260 | ies->from_beacon = true; |
7b506ff6 | 2261 | fallthrough; |
5bc8c1f2 JB |
2262 | case CFG80211_BSS_FTYPE_UNKNOWN: |
2263 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); | |
2264 | break; | |
2265 | case CFG80211_BSS_FTYPE_PRESP: | |
2266 | rcu_assign_pointer(tmp.pub.proberesp_ies, ies); | |
2267 | break; | |
2268 | } | |
9caf0364 | 2269 | rcu_assign_pointer(tmp.pub.ies, ies); |
06aa7afa | 2270 | |
eb142608 | 2271 | signal_valid = drv_data->chan == channel; |
6b7c93c1 BB |
2272 | spin_lock_bh(&rdev->bss_lock); |
2273 | res = __cfg80211_bss_update(rdev, &tmp, signal_valid, ts); | |
06aa7afa | 2274 | if (!res) |
6b7c93c1 | 2275 | goto drop; |
06aa7afa | 2276 | |
3e3929ef | 2277 | rdev_inform_bss(rdev, &res->pub, ies, drv_data->drv_data); |
5db25290 | 2278 | |
2481b5da | 2279 | if (data->bss_source == BSS_SOURCE_MBSSID) { |
0b8fb823 PX |
2280 | /* this is a nontransmitting bss, we need to add it to |
2281 | * transmitting bss' list if it is not there | |
2282 | */ | |
eb142608 | 2283 | if (cfg80211_add_nontrans_list(data->source_bss, &res->pub)) { |
0b780881 | 2284 | if (__cfg80211_unlink_bss(rdev, res)) { |
0b8fb823 | 2285 | rdev->bss_generation++; |
0b780881 JB |
2286 | res = NULL; |
2287 | } | |
0b8fb823 | 2288 | } |
0b780881 JB |
2289 | |
2290 | if (!res) | |
6b7c93c1 | 2291 | goto drop; |
0b8fb823 | 2292 | } |
6b7c93c1 | 2293 | spin_unlock_bh(&rdev->bss_lock); |
0b8fb823 | 2294 | |
4ee3e063 | 2295 | trace_cfg80211_return_bss(&res->pub); |
6b7c93c1 | 2296 | /* __cfg80211_bss_update gives us a referenced result */ |
06aa7afa | 2297 | return &res->pub; |
6b7c93c1 BB |
2298 | |
2299 | drop: | |
2300 | spin_unlock_bh(&rdev->bss_lock); | |
2301 | return NULL; | |
06aa7afa | 2302 | } |
06aa7afa | 2303 | |
fe806e49 SS |
2304 | static const struct element |
2305 | *cfg80211_get_profile_continuation(const u8 *ie, size_t ielen, | |
2306 | const struct element *mbssid_elem, | |
2307 | const struct element *sub_elem) | |
2308 | { | |
2309 | const u8 *mbssid_end = mbssid_elem->data + mbssid_elem->datalen; | |
2310 | const struct element *next_mbssid; | |
2311 | const struct element *next_sub; | |
2312 | ||
2313 | next_mbssid = cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID, | |
2314 | mbssid_end, | |
2315 | ielen - (mbssid_end - ie)); | |
2316 | ||
2317 | /* | |
8cf5c86d | 2318 | * If it is not the last subelement in current MBSSID IE or there isn't |
fe806e49 SS |
2319 | * a next MBSSID IE - profile is complete. |
2320 | */ | |
2321 | if ((sub_elem->data + sub_elem->datalen < mbssid_end - 1) || | |
2322 | !next_mbssid) | |
2323 | return NULL; | |
2324 | ||
2325 | /* For any length error, just return NULL */ | |
2326 | ||
2327 | if (next_mbssid->datalen < 4) | |
2328 | return NULL; | |
2329 | ||
2330 | next_sub = (void *)&next_mbssid->data[1]; | |
2331 | ||
2332 | if (next_mbssid->data + next_mbssid->datalen < | |
2333 | next_sub->data + next_sub->datalen) | |
2334 | return NULL; | |
2335 | ||
2336 | if (next_sub->id != 0 || next_sub->datalen < 2) | |
2337 | return NULL; | |
2338 | ||
2339 | /* | |
2340 | * Check if the first element in the next sub element is a start | |
2341 | * of a new profile | |
2342 | */ | |
2343 | return next_sub->data[0] == WLAN_EID_NON_TX_BSSID_CAP ? | |
2344 | NULL : next_mbssid; | |
2345 | } | |
2346 | ||
2347 | size_t cfg80211_merge_profile(const u8 *ie, size_t ielen, | |
2348 | const struct element *mbssid_elem, | |
2349 | const struct element *sub_elem, | |
5809a5d5 | 2350 | u8 *merged_ie, size_t max_copy_len) |
fe806e49 SS |
2351 | { |
2352 | size_t copied_len = sub_elem->datalen; | |
2353 | const struct element *next_mbssid; | |
2354 | ||
2355 | if (sub_elem->datalen > max_copy_len) | |
2356 | return 0; | |
2357 | ||
5809a5d5 | 2358 | memcpy(merged_ie, sub_elem->data, sub_elem->datalen); |
fe806e49 SS |
2359 | |
2360 | while ((next_mbssid = cfg80211_get_profile_continuation(ie, ielen, | |
2361 | mbssid_elem, | |
2362 | sub_elem))) { | |
2363 | const struct element *next_sub = (void *)&next_mbssid->data[1]; | |
2364 | ||
2365 | if (copied_len + next_sub->datalen > max_copy_len) | |
2366 | break; | |
5809a5d5 | 2367 | memcpy(merged_ie + copied_len, next_sub->data, |
fe806e49 SS |
2368 | next_sub->datalen); |
2369 | copied_len += next_sub->datalen; | |
2370 | } | |
2371 | ||
2372 | return copied_len; | |
2373 | } | |
2374 | EXPORT_SYMBOL(cfg80211_merge_profile); | |
2375 | ||
eb142608 BB |
2376 | static void |
2377 | cfg80211_parse_mbssid_data(struct wiphy *wiphy, | |
2378 | struct cfg80211_inform_single_bss_data *tx_data, | |
2379 | struct cfg80211_bss *source_bss, | |
2380 | gfp_t gfp) | |
0b8fb823 | 2381 | { |
eb142608 BB |
2382 | struct cfg80211_inform_single_bss_data data = { |
2383 | .drv_data = tx_data->drv_data, | |
2384 | .ftype = tx_data->ftype, | |
2385 | .tsf = tx_data->tsf, | |
2386 | .beacon_interval = tx_data->beacon_interval, | |
2387 | .source_bss = source_bss, | |
2481b5da | 2388 | .bss_source = BSS_SOURCE_MBSSID, |
d02a12b8 JB |
2389 | .use_for = tx_data->use_for, |
2390 | .cannot_use_reasons = tx_data->cannot_use_reasons, | |
eb142608 | 2391 | }; |
1c8745f3 JB |
2392 | const u8 *mbssid_index_ie; |
2393 | const struct element *elem, *sub; | |
fe806e49 SS |
2394 | u8 *new_ie, *profile; |
2395 | u64 seen_indices = 0; | |
0b8fb823 PX |
2396 | struct cfg80211_bss *bss; |
2397 | ||
eb142608 | 2398 | if (!source_bss) |
0b8fb823 | 2399 | return; |
eb142608 BB |
2400 | if (!cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID, |
2401 | tx_data->ie, tx_data->ielen)) | |
0b8fb823 | 2402 | return; |
213ed579 SS |
2403 | if (!wiphy->support_mbssid) |
2404 | return; | |
2405 | if (wiphy->support_only_he_mbssid && | |
eb142608 BB |
2406 | !cfg80211_find_ext_elem(WLAN_EID_EXT_HE_CAPABILITY, |
2407 | tx_data->ie, tx_data->ielen)) | |
213ed579 | 2408 | return; |
0b8fb823 | 2409 | |
0b8fb823 PX |
2410 | new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp); |
2411 | if (!new_ie) | |
2412 | return; | |
2413 | ||
eb142608 | 2414 | profile = kmalloc(tx_data->ielen, gfp); |
fe806e49 SS |
2415 | if (!profile) |
2416 | goto out; | |
2417 | ||
eb142608 BB |
2418 | for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, |
2419 | tx_data->ie, tx_data->ielen) { | |
1c8745f3 JB |
2420 | if (elem->datalen < 4) |
2421 | continue; | |
8f033d2b JB |
2422 | if (elem->data[0] < 1 || (int)elem->data[0] > 8) |
2423 | continue; | |
1c8745f3 | 2424 | for_each_element(sub, elem->data + 1, elem->datalen - 1) { |
fe806e49 SS |
2425 | u8 profile_len; |
2426 | ||
1c8745f3 | 2427 | if (sub->id != 0 || sub->datalen < 4) { |
0b8fb823 PX |
2428 | /* not a valid BSS profile */ |
2429 | continue; | |
2430 | } | |
2431 | ||
1c8745f3 JB |
2432 | if (sub->data[0] != WLAN_EID_NON_TX_BSSID_CAP || |
2433 | sub->data[1] != 2) { | |
0b8fb823 PX |
2434 | /* The first element within the Nontransmitted |
2435 | * BSSID Profile is not the Nontransmitted | |
2436 | * BSSID Capability element. | |
2437 | */ | |
2438 | continue; | |
2439 | } | |
2440 | ||
eb142608 BB |
2441 | memset(profile, 0, tx_data->ielen); |
2442 | profile_len = cfg80211_merge_profile(tx_data->ie, | |
2443 | tx_data->ielen, | |
fe806e49 SS |
2444 | elem, |
2445 | sub, | |
5809a5d5 | 2446 | profile, |
eb142608 | 2447 | tx_data->ielen); |
fe806e49 | 2448 | |
0b8fb823 PX |
2449 | /* found a Nontransmitted BSSID Profile */ |
2450 | mbssid_index_ie = cfg80211_find_ie | |
2451 | (WLAN_EID_MULTI_BSSID_IDX, | |
fe806e49 | 2452 | profile, profile_len); |
0b8fb823 | 2453 | if (!mbssid_index_ie || mbssid_index_ie[1] < 1 || |
fe806e49 | 2454 | mbssid_index_ie[2] == 0 || |
c7378d7d BB |
2455 | mbssid_index_ie[2] > 46 || |
2456 | mbssid_index_ie[2] >= (1 << elem->data[0])) { | |
0b8fb823 PX |
2457 | /* No valid Multiple BSSID-Index element */ |
2458 | continue; | |
2459 | } | |
2460 | ||
ebb3ca3b | 2461 | if (seen_indices & BIT_ULL(mbssid_index_ie[2])) |
fe806e49 SS |
2462 | /* We don't support legacy split of a profile */ |
2463 | net_dbg_ratelimited("Partial info for BSSID index %d\n", | |
2464 | mbssid_index_ie[2]); | |
2465 | ||
ebb3ca3b | 2466 | seen_indices |= BIT_ULL(mbssid_index_ie[2]); |
fe806e49 | 2467 | |
eb142608 BB |
2468 | data.bssid_index = mbssid_index_ie[2]; |
2469 | data.max_bssid_indicator = elem->data[0]; | |
2470 | ||
2471 | cfg80211_gen_new_bssid(tx_data->bssid, | |
2472 | data.max_bssid_indicator, | |
2473 | data.bssid_index, | |
2474 | data.bssid); | |
0cd01efb | 2475 | |
0b8fb823 | 2476 | memset(new_ie, 0, IEEE80211_MAX_DATA_LEN); |
eb142608 BB |
2477 | data.ie = new_ie; |
2478 | data.ielen = cfg80211_gen_new_ie(tx_data->ie, | |
2479 | tx_data->ielen, | |
fe806e49 | 2480 | profile, |
eb142608 BB |
2481 | profile_len, |
2482 | new_ie, | |
dfd9aa3e | 2483 | IEEE80211_MAX_DATA_LEN); |
eb142608 | 2484 | if (!data.ielen) |
0b8fb823 PX |
2485 | continue; |
2486 | ||
eb142608 BB |
2487 | data.capability = get_unaligned_le16(profile + 2); |
2488 | bss = cfg80211_inform_single_bss_data(wiphy, &data, gfp); | |
0b8fb823 PX |
2489 | if (!bss) |
2490 | break; | |
2491 | cfg80211_put_bss(wiphy, bss); | |
2492 | } | |
0b8fb823 PX |
2493 | } |
2494 | ||
fe806e49 | 2495 | out: |
0b8fb823 | 2496 | kfree(new_ie); |
fe806e49 | 2497 | kfree(profile); |
0b8fb823 PX |
2498 | } |
2499 | ||
f837a653 BB |
2500 | ssize_t cfg80211_defragment_element(const struct element *elem, const u8 *ies, |
2501 | size_t ieslen, u8 *data, size_t data_len, | |
2502 | u8 frag_id) | |
2503 | { | |
2504 | const struct element *next; | |
2505 | ssize_t copied; | |
2506 | u8 elem_datalen; | |
2507 | ||
2508 | if (!elem) | |
2509 | return -EINVAL; | |
2510 | ||
2511 | /* elem might be invalid after the memmove */ | |
2512 | next = (void *)(elem->data + elem->datalen); | |
f837a653 | 2513 | elem_datalen = elem->datalen; |
43125539 | 2514 | |
f837a653 BB |
2515 | if (elem->id == WLAN_EID_EXTENSION) { |
2516 | copied = elem->datalen - 1; | |
f837a653 | 2517 | |
8ade3356 JB |
2518 | if (data) { |
2519 | if (copied > data_len) | |
2520 | return -ENOSPC; | |
2521 | ||
2522 | memmove(data, elem->data + 1, copied); | |
2523 | } | |
f837a653 BB |
2524 | } else { |
2525 | copied = elem->datalen; | |
f837a653 | 2526 | |
8ade3356 JB |
2527 | if (data) { |
2528 | if (copied > data_len) | |
2529 | return -ENOSPC; | |
2530 | ||
2531 | memmove(data, elem->data, copied); | |
2532 | } | |
f837a653 BB |
2533 | } |
2534 | ||
2535 | /* Fragmented elements must have 255 bytes */ | |
2536 | if (elem_datalen < 255) | |
2537 | return copied; | |
2538 | ||
2539 | for (elem = next; | |
2540 | elem->data < ies + ieslen && | |
43125539 | 2541 | elem->data + elem->datalen <= ies + ieslen; |
f837a653 BB |
2542 | elem = next) { |
2543 | /* elem might be invalid after the memmove */ | |
2544 | next = (void *)(elem->data + elem->datalen); | |
2545 | ||
2546 | if (elem->id != frag_id) | |
2547 | break; | |
2548 | ||
2549 | elem_datalen = elem->datalen; | |
2550 | ||
8ade3356 JB |
2551 | if (data) { |
2552 | if (copied + elem_datalen > data_len) | |
2553 | return -ENOSPC; | |
2554 | ||
2555 | memmove(data + copied, elem->data, elem_datalen); | |
2556 | } | |
f837a653 | 2557 | |
f837a653 BB |
2558 | copied += elem_datalen; |
2559 | ||
2560 | /* Only the last fragment may be short */ | |
2561 | if (elem_datalen != 255) | |
2562 | break; | |
2563 | } | |
2564 | ||
2565 | return copied; | |
2566 | } | |
2567 | EXPORT_SYMBOL(cfg80211_defragment_element); | |
2568 | ||
2481b5da BB |
2569 | struct cfg80211_mle { |
2570 | struct ieee80211_multi_link_elem *mle; | |
2571 | struct ieee80211_mle_per_sta_profile | |
2572 | *sta_prof[IEEE80211_MLD_MAX_NUM_LINKS]; | |
2573 | ssize_t sta_prof_len[IEEE80211_MLD_MAX_NUM_LINKS]; | |
2574 | ||
2575 | u8 data[]; | |
2576 | }; | |
2577 | ||
2578 | static struct cfg80211_mle * | |
2579 | cfg80211_defrag_mle(const struct element *mle, const u8 *ie, size_t ielen, | |
2580 | gfp_t gfp) | |
2581 | { | |
2582 | const struct element *elem; | |
2583 | struct cfg80211_mle *res; | |
2584 | size_t buf_len; | |
2585 | ssize_t mle_len; | |
2586 | u8 common_size, idx; | |
2587 | ||
2588 | if (!mle || !ieee80211_mle_size_ok(mle->data + 1, mle->datalen - 1)) | |
2589 | return NULL; | |
2590 | ||
2591 | /* Required length for first defragmentation */ | |
2592 | buf_len = mle->datalen - 1; | |
2593 | for_each_element(elem, mle->data + mle->datalen, | |
2594 | ielen - sizeof(*mle) + mle->datalen) { | |
2595 | if (elem->id != WLAN_EID_FRAGMENT) | |
2596 | break; | |
2597 | ||
2598 | buf_len += elem->datalen; | |
2599 | } | |
2600 | ||
2601 | res = kzalloc(struct_size(res, data, buf_len), gfp); | |
2602 | if (!res) | |
2603 | return NULL; | |
2604 | ||
2605 | mle_len = cfg80211_defragment_element(mle, ie, ielen, | |
2606 | res->data, buf_len, | |
2607 | WLAN_EID_FRAGMENT); | |
2608 | if (mle_len < 0) | |
2609 | goto error; | |
2610 | ||
2611 | res->mle = (void *)res->data; | |
2612 | ||
2613 | /* Find the sub-element area in the buffer */ | |
2614 | common_size = ieee80211_mle_common_size((u8 *)res->mle); | |
2615 | ie = res->data + common_size; | |
2616 | ielen = mle_len - common_size; | |
2617 | ||
2618 | idx = 0; | |
2619 | for_each_element_id(elem, IEEE80211_MLE_SUBELEM_PER_STA_PROFILE, | |
2620 | ie, ielen) { | |
2621 | res->sta_prof[idx] = (void *)elem->data; | |
2622 | res->sta_prof_len[idx] = elem->datalen; | |
2623 | ||
2624 | idx++; | |
2625 | if (idx >= IEEE80211_MLD_MAX_NUM_LINKS) | |
2626 | break; | |
2627 | } | |
2628 | if (!for_each_element_completed(elem, ie, ielen)) | |
2629 | goto error; | |
2630 | ||
2631 | /* Defragment sta_info in-place */ | |
2632 | for (idx = 0; idx < IEEE80211_MLD_MAX_NUM_LINKS && res->sta_prof[idx]; | |
2633 | idx++) { | |
2634 | if (res->sta_prof_len[idx] < 255) | |
2635 | continue; | |
2636 | ||
2637 | elem = (void *)res->sta_prof[idx] - 2; | |
2638 | ||
2639 | if (idx + 1 < ARRAY_SIZE(res->sta_prof) && | |
2640 | res->sta_prof[idx + 1]) | |
2641 | buf_len = (u8 *)res->sta_prof[idx + 1] - | |
2642 | (u8 *)res->sta_prof[idx]; | |
2643 | else | |
2644 | buf_len = ielen + ie - (u8 *)elem; | |
2645 | ||
2646 | res->sta_prof_len[idx] = | |
2647 | cfg80211_defragment_element(elem, | |
2648 | (u8 *)elem, buf_len, | |
2649 | (u8 *)res->sta_prof[idx], | |
2650 | buf_len, | |
2651 | IEEE80211_MLE_SUBELEM_FRAGMENT); | |
2652 | if (res->sta_prof_len[idx] < 0) | |
2653 | goto error; | |
2654 | } | |
2655 | ||
2656 | return res; | |
2657 | ||
2658 | error: | |
2659 | kfree(res); | |
2660 | return NULL; | |
2661 | } | |
2662 | ||
6b756efc JB |
2663 | struct tbtt_info_iter_data { |
2664 | const struct ieee80211_neighbor_ap_info *ap_info; | |
2665 | u8 param_ch_count; | |
2666 | u32 use_for; | |
2667 | u8 mld_id, link_id; | |
97f8df4d | 2668 | bool non_tx; |
6b756efc | 2669 | }; |
2481b5da | 2670 | |
6b756efc JB |
2671 | static enum cfg80211_rnr_iter_ret |
2672 | cfg802121_mld_ap_rnr_iter(void *_data, u8 type, | |
2673 | const struct ieee80211_neighbor_ap_info *info, | |
2674 | const u8 *tbtt_info, u8 tbtt_info_len) | |
2675 | { | |
2676 | const struct ieee80211_rnr_mld_params *mld_params; | |
2677 | struct tbtt_info_iter_data *data = _data; | |
2678 | u8 link_id; | |
97f8df4d | 2679 | bool non_tx = false; |
6b756efc JB |
2680 | |
2681 | if (type == IEEE80211_TBTT_INFO_TYPE_TBTT && | |
2682 | tbtt_info_len >= offsetofend(struct ieee80211_tbtt_info_ge_11, | |
97f8df4d BB |
2683 | mld_params)) { |
2684 | const struct ieee80211_tbtt_info_ge_11 *tbtt_info_ge_11 = | |
2685 | (void *)tbtt_info; | |
2686 | ||
2687 | non_tx = (tbtt_info_ge_11->bss_params & | |
2688 | (IEEE80211_RNR_TBTT_PARAMS_MULTI_BSSID | | |
2689 | IEEE80211_RNR_TBTT_PARAMS_TRANSMITTED_BSSID)) == | |
2690 | IEEE80211_RNR_TBTT_PARAMS_MULTI_BSSID; | |
2691 | mld_params = &tbtt_info_ge_11->mld_params; | |
2692 | } else if (type == IEEE80211_TBTT_INFO_TYPE_MLD && | |
6b756efc JB |
2693 | tbtt_info_len >= sizeof(struct ieee80211_rnr_mld_params)) |
2694 | mld_params = (void *)tbtt_info; | |
2695 | else | |
2696 | return RNR_ITER_CONTINUE; | |
2481b5da | 2697 | |
6b756efc JB |
2698 | link_id = le16_get_bits(mld_params->params, |
2699 | IEEE80211_RNR_MLD_PARAMS_LINK_ID); | |
2481b5da | 2700 | |
6b756efc JB |
2701 | if (data->mld_id != mld_params->mld_id) |
2702 | return RNR_ITER_CONTINUE; | |
2481b5da | 2703 | |
6b756efc JB |
2704 | if (data->link_id != link_id) |
2705 | return RNR_ITER_CONTINUE; | |
2481b5da | 2706 | |
6b756efc JB |
2707 | data->ap_info = info; |
2708 | data->param_ch_count = | |
2709 | le16_get_bits(mld_params->params, | |
2710 | IEEE80211_RNR_MLD_PARAMS_BSS_CHANGE_COUNT); | |
97f8df4d | 2711 | data->non_tx = non_tx; |
2481b5da | 2712 | |
6b756efc JB |
2713 | if (type == IEEE80211_TBTT_INFO_TYPE_TBTT) |
2714 | data->use_for = NL80211_BSS_USE_FOR_ALL; | |
2715 | else | |
2716 | data->use_for = NL80211_BSS_USE_FOR_MLD_LINK; | |
2717 | return RNR_ITER_BREAK; | |
2718 | } | |
2481b5da | 2719 | |
6b756efc JB |
2720 | static u8 |
2721 | cfg80211_rnr_info_for_mld_ap(const u8 *ie, size_t ielen, u8 mld_id, u8 link_id, | |
2722 | const struct ieee80211_neighbor_ap_info **ap_info, | |
97f8df4d | 2723 | u8 *param_ch_count, bool *non_tx) |
6b756efc JB |
2724 | { |
2725 | struct tbtt_info_iter_data data = { | |
2726 | .mld_id = mld_id, | |
2727 | .link_id = link_id, | |
2728 | }; | |
2481b5da | 2729 | |
6b756efc | 2730 | cfg80211_iter_rnr(ie, ielen, cfg802121_mld_ap_rnr_iter, &data); |
2481b5da | 2731 | |
6b756efc JB |
2732 | *ap_info = data.ap_info; |
2733 | *param_ch_count = data.param_ch_count; | |
97f8df4d | 2734 | *non_tx = data.non_tx; |
2481b5da | 2735 | |
6b756efc | 2736 | return data.use_for; |
2481b5da BB |
2737 | } |
2738 | ||
4d1d6b3f BB |
2739 | static struct element * |
2740 | cfg80211_gen_reporter_rnr(struct cfg80211_bss *source_bss, bool is_mbssid, | |
2741 | bool same_mld, u8 link_id, u8 bss_change_count, | |
2742 | gfp_t gfp) | |
2743 | { | |
2744 | const struct cfg80211_bss_ies *ies; | |
2745 | struct ieee80211_neighbor_ap_info ap_info; | |
2746 | struct ieee80211_tbtt_info_ge_11 tbtt_info; | |
2747 | u32 short_ssid; | |
2748 | const struct element *elem; | |
2749 | struct element *res; | |
2750 | ||
2751 | /* | |
2752 | * We only generate the RNR to permit ML lookups. For that we do not | |
2753 | * need an entry for the corresponding transmitting BSS, lets just skip | |
2754 | * it even though it would be easy to add. | |
2755 | */ | |
2756 | if (!same_mld) | |
2757 | return NULL; | |
2758 | ||
2759 | /* We could use tx_data->ies if we change cfg80211_calc_short_ssid */ | |
2760 | rcu_read_lock(); | |
2761 | ies = rcu_dereference(source_bss->ies); | |
2762 | ||
2763 | ap_info.tbtt_info_len = offsetofend(typeof(tbtt_info), mld_params); | |
2764 | ap_info.tbtt_info_hdr = | |
2765 | u8_encode_bits(IEEE80211_TBTT_INFO_TYPE_TBTT, | |
2766 | IEEE80211_AP_INFO_TBTT_HDR_TYPE) | | |
2767 | u8_encode_bits(0, IEEE80211_AP_INFO_TBTT_HDR_COUNT); | |
2768 | ||
2769 | ap_info.channel = ieee80211_frequency_to_channel(source_bss->channel->center_freq); | |
2770 | ||
2771 | /* operating class */ | |
2772 | elem = cfg80211_find_elem(WLAN_EID_SUPPORTED_REGULATORY_CLASSES, | |
2773 | ies->data, ies->len); | |
2774 | if (elem && elem->datalen >= 1) { | |
2775 | ap_info.op_class = elem->data[0]; | |
2776 | } else { | |
2777 | struct cfg80211_chan_def chandef; | |
2778 | ||
2779 | /* The AP is not providing us with anything to work with. So | |
2780 | * make up a somewhat reasonable operating class, but don't | |
2781 | * bother with it too much as no one will ever use the | |
2782 | * information. | |
2783 | */ | |
2784 | cfg80211_chandef_create(&chandef, source_bss->channel, | |
2785 | NL80211_CHAN_NO_HT); | |
2786 | ||
2787 | if (!ieee80211_chandef_to_operating_class(&chandef, | |
2788 | &ap_info.op_class)) | |
2789 | goto out_unlock; | |
2790 | } | |
2791 | ||
2792 | /* Just set TBTT offset and PSD 20 to invalid/unknown */ | |
2793 | tbtt_info.tbtt_offset = 255; | |
2794 | tbtt_info.psd_20 = IEEE80211_RNR_TBTT_PARAMS_PSD_RESERVED; | |
2795 | ||
2796 | memcpy(tbtt_info.bssid, source_bss->bssid, ETH_ALEN); | |
2797 | if (cfg80211_calc_short_ssid(ies, &elem, &short_ssid)) | |
2798 | goto out_unlock; | |
2799 | ||
2800 | rcu_read_unlock(); | |
2801 | ||
2802 | tbtt_info.short_ssid = cpu_to_le32(short_ssid); | |
2803 | ||
2804 | tbtt_info.bss_params = IEEE80211_RNR_TBTT_PARAMS_SAME_SSID; | |
2805 | ||
2806 | if (is_mbssid) { | |
2807 | tbtt_info.bss_params |= IEEE80211_RNR_TBTT_PARAMS_MULTI_BSSID; | |
2808 | tbtt_info.bss_params |= IEEE80211_RNR_TBTT_PARAMS_TRANSMITTED_BSSID; | |
2809 | } | |
2810 | ||
2811 | tbtt_info.mld_params.mld_id = 0; | |
2812 | tbtt_info.mld_params.params = | |
2813 | le16_encode_bits(link_id, IEEE80211_RNR_MLD_PARAMS_LINK_ID) | | |
2814 | le16_encode_bits(bss_change_count, | |
2815 | IEEE80211_RNR_MLD_PARAMS_BSS_CHANGE_COUNT); | |
2816 | ||
2817 | res = kzalloc(struct_size(res, data, | |
2818 | sizeof(ap_info) + ap_info.tbtt_info_len), | |
2819 | gfp); | |
2820 | if (!res) | |
2821 | return NULL; | |
2822 | ||
2823 | /* Copy the data */ | |
2824 | res->id = WLAN_EID_REDUCED_NEIGHBOR_REPORT; | |
2825 | res->datalen = sizeof(ap_info) + ap_info.tbtt_info_len; | |
2826 | memcpy(res->data, &ap_info, sizeof(ap_info)); | |
2827 | memcpy(res->data + sizeof(ap_info), &tbtt_info, ap_info.tbtt_info_len); | |
2828 | ||
2829 | return res; | |
2830 | ||
2831 | out_unlock: | |
2832 | rcu_read_unlock(); | |
2833 | return NULL; | |
2834 | } | |
2835 | ||
d18125b6 BB |
2836 | static void |
2837 | cfg80211_parse_ml_elem_sta_data(struct wiphy *wiphy, | |
2838 | struct cfg80211_inform_single_bss_data *tx_data, | |
2839 | struct cfg80211_bss *source_bss, | |
2840 | const struct element *elem, | |
2841 | gfp_t gfp) | |
2481b5da BB |
2842 | { |
2843 | struct cfg80211_inform_single_bss_data data = { | |
2844 | .drv_data = tx_data->drv_data, | |
2845 | .ftype = tx_data->ftype, | |
2846 | .source_bss = source_bss, | |
2847 | .bss_source = BSS_SOURCE_STA_PROFILE, | |
2848 | }; | |
4d1d6b3f | 2849 | struct element *reporter_rnr = NULL; |
2481b5da | 2850 | struct ieee80211_multi_link_elem *ml_elem; |
2481b5da BB |
2851 | struct cfg80211_mle *mle; |
2852 | u16 control; | |
5f478adf | 2853 | u8 ml_common_len; |
4d1d6b3f | 2854 | u8 *new_ie = NULL; |
2481b5da | 2855 | struct cfg80211_bss *bss; |
4d1d6b3f | 2856 | u8 mld_id, reporter_link_id, bss_change_count; |
2481b5da | 2857 | u16 seen_links = 0; |
2481b5da BB |
2858 | u8 i; |
2859 | ||
894dd84e JB |
2860 | if (!ieee80211_mle_type_ok(elem->data + 1, |
2861 | IEEE80211_ML_CONTROL_TYPE_BASIC, | |
2862 | elem->datalen - 1)) | |
2481b5da BB |
2863 | return; |
2864 | ||
894dd84e | 2865 | ml_elem = (void *)(elem->data + 1); |
2481b5da | 2866 | control = le16_to_cpu(ml_elem->control); |
894dd84e | 2867 | ml_common_len = ml_elem->variable[0]; |
2481b5da BB |
2868 | |
2869 | /* Must be present when transmitted by an AP (in a probe response) */ | |
2870 | if (!(control & IEEE80211_MLC_BASIC_PRES_BSS_PARAM_CH_CNT) || | |
2871 | !(control & IEEE80211_MLC_BASIC_PRES_LINK_ID) || | |
2872 | !(control & IEEE80211_MLC_BASIC_PRES_MLD_CAPA_OP)) | |
2873 | return; | |
2874 | ||
894dd84e JB |
2875 | reporter_link_id = ieee80211_mle_get_link_id(elem->data + 1); |
2876 | bss_change_count = ieee80211_mle_get_bss_param_ch_cnt(elem->data + 1); | |
2481b5da | 2877 | |
2a0698f8 BB |
2878 | /* |
2879 | * The MLD ID of the reporting AP is always zero. It is set if the AP | |
2880 | * is part of an MBSSID set and will be non-zero for ML Elements | |
2881 | * relating to a nontransmitted BSS (matching the Multi-BSSID Index, | |
2882 | * Draft P802.11be_D3.2, 35.3.4.2) | |
2481b5da | 2883 | */ |
894dd84e | 2884 | mld_id = ieee80211_mle_get_mld_id(elem->data + 1); |
2481b5da BB |
2885 | |
2886 | /* Fully defrag the ML element for sta information/profile iteration */ | |
2887 | mle = cfg80211_defrag_mle(elem, tx_data->ie, tx_data->ielen, gfp); | |
2888 | if (!mle) | |
2889 | return; | |
2890 | ||
4d1d6b3f BB |
2891 | /* No point in doing anything if there is no per-STA profile */ |
2892 | if (!mle->sta_prof[0]) | |
2893 | goto out; | |
2894 | ||
2481b5da BB |
2895 | new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp); |
2896 | if (!new_ie) | |
2897 | goto out; | |
2898 | ||
4d1d6b3f BB |
2899 | reporter_rnr = cfg80211_gen_reporter_rnr(source_bss, |
2900 | u16_get_bits(control, | |
2901 | IEEE80211_MLC_BASIC_PRES_MLD_ID), | |
2902 | mld_id == 0, reporter_link_id, | |
2903 | bss_change_count, | |
2904 | gfp); | |
2905 | ||
2481b5da BB |
2906 | for (i = 0; i < ARRAY_SIZE(mle->sta_prof) && mle->sta_prof[i]; i++) { |
2907 | const struct ieee80211_neighbor_ap_info *ap_info; | |
2908 | enum nl80211_band band; | |
2909 | u32 freq; | |
2910 | const u8 *profile; | |
2481b5da | 2911 | ssize_t profile_len; |
f8599d63 | 2912 | u8 param_ch_count; |
d02a12b8 | 2913 | u8 link_id, use_for; |
97f8df4d | 2914 | bool non_tx; |
2481b5da BB |
2915 | |
2916 | if (!ieee80211_mle_basic_sta_prof_size_ok((u8 *)mle->sta_prof[i], | |
2917 | mle->sta_prof_len[i])) | |
2918 | continue; | |
2919 | ||
2920 | control = le16_to_cpu(mle->sta_prof[i]->control); | |
2921 | ||
2922 | if (!(control & IEEE80211_MLE_STA_CONTROL_COMPLETE_PROFILE)) | |
2923 | continue; | |
2924 | ||
2925 | link_id = u16_get_bits(control, | |
2926 | IEEE80211_MLE_STA_CONTROL_LINK_ID); | |
2927 | if (seen_links & BIT(link_id)) | |
2928 | break; | |
2929 | seen_links |= BIT(link_id); | |
2930 | ||
2931 | if (!(control & IEEE80211_MLE_STA_CONTROL_BEACON_INT_PRESENT) || | |
2932 | !(control & IEEE80211_MLE_STA_CONTROL_TSF_OFFS_PRESENT) || | |
2933 | !(control & IEEE80211_MLE_STA_CONTROL_STA_MAC_ADDR_PRESENT)) | |
2934 | continue; | |
2935 | ||
2936 | memcpy(data.bssid, mle->sta_prof[i]->variable, ETH_ALEN); | |
2937 | data.beacon_interval = | |
2938 | get_unaligned_le16(mle->sta_prof[i]->variable + 6); | |
2939 | data.tsf = tx_data->tsf + | |
2940 | get_unaligned_le64(mle->sta_prof[i]->variable + 8); | |
2941 | ||
2942 | /* sta_info_len counts itself */ | |
2943 | profile = mle->sta_prof[i]->variable + | |
2944 | mle->sta_prof[i]->sta_info_len - 1; | |
2945 | profile_len = (u8 *)mle->sta_prof[i] + mle->sta_prof_len[i] - | |
2946 | profile; | |
2947 | ||
2948 | if (profile_len < 2) | |
2949 | continue; | |
2950 | ||
2951 | data.capability = get_unaligned_le16(profile); | |
2952 | profile += 2; | |
2953 | profile_len -= 2; | |
2954 | ||
2955 | /* Find in RNR to look up channel information */ | |
f8599d63 BB |
2956 | use_for = cfg80211_rnr_info_for_mld_ap(tx_data->ie, |
2957 | tx_data->ielen, | |
2958 | mld_id, link_id, | |
2959 | &ap_info, | |
97f8df4d BB |
2960 | ¶m_ch_count, |
2961 | &non_tx); | |
d02a12b8 | 2962 | if (!use_for) |
2481b5da BB |
2963 | continue; |
2964 | ||
97f8df4d BB |
2965 | /* |
2966 | * As of 802.11be_D5.0, the specification does not give us any | |
2967 | * way of discovering both the MaxBSSID and the Multiple-BSSID | |
2968 | * Index. It does seem like the Multiple-BSSID Index element | |
2969 | * may be provided, but section 9.4.2.45 explicitly forbids | |
2970 | * including a Multiple-BSSID Element (in this case without any | |
2971 | * subelements). | |
2972 | * Without both pieces of information we cannot calculate the | |
2973 | * reference BSSID, so simply ignore the BSS. | |
2974 | */ | |
2975 | if (non_tx) | |
2976 | continue; | |
2977 | ||
2481b5da BB |
2978 | /* We could sanity check the BSSID is included */ |
2979 | ||
2980 | if (!ieee80211_operating_class_to_band(ap_info->op_class, | |
2981 | &band)) | |
2982 | continue; | |
2983 | ||
2984 | freq = ieee80211_channel_to_freq_khz(ap_info->channel, band); | |
2985 | data.channel = ieee80211_get_channel_khz(wiphy, freq); | |
2986 | ||
d02a12b8 JB |
2987 | if (use_for == NL80211_BSS_USE_FOR_MLD_LINK && |
2988 | !(wiphy->flags & WIPHY_FLAG_SUPPORTS_NSTR_NONPRIMARY)) { | |
2989 | use_for = 0; | |
2990 | data.cannot_use_reasons = | |
2991 | NL80211_BSS_CANNOT_USE_NSTR_NONPRIMARY; | |
2992 | } | |
2993 | data.use_for = use_for; | |
2994 | ||
2481b5da BB |
2995 | /* Generate new elements */ |
2996 | memset(new_ie, 0, IEEE80211_MAX_DATA_LEN); | |
2997 | data.ie = new_ie; | |
2998 | data.ielen = cfg80211_gen_new_ie(tx_data->ie, tx_data->ielen, | |
2999 | profile, profile_len, | |
3000 | new_ie, | |
3001 | IEEE80211_MAX_DATA_LEN); | |
3002 | if (!data.ielen) | |
3003 | continue; | |
3004 | ||
5f478adf BB |
3005 | /* The generated elements do not contain: |
3006 | * - Basic ML element | |
3007 | * - A TBTT entry in the RNR for the transmitting AP | |
3008 | * | |
3009 | * This information is needed both internally and in userspace | |
3010 | * as such, we should append it here. | |
3011 | */ | |
3012 | if (data.ielen + 3 + sizeof(*ml_elem) + ml_common_len > | |
3013 | IEEE80211_MAX_DATA_LEN) | |
3014 | continue; | |
3015 | ||
3016 | /* Copy the Basic Multi-Link element including the common | |
f8599d63 BB |
3017 | * information, and then fix up the link ID and BSS param |
3018 | * change count. | |
5f478adf BB |
3019 | * Note that the ML element length has been verified and we |
3020 | * also checked that it contains the link ID. | |
3021 | */ | |
3022 | new_ie[data.ielen++] = WLAN_EID_EXTENSION; | |
3023 | new_ie[data.ielen++] = 1 + sizeof(*ml_elem) + ml_common_len; | |
3024 | new_ie[data.ielen++] = WLAN_EID_EXT_EHT_MULTI_LINK; | |
3025 | memcpy(new_ie + data.ielen, ml_elem, | |
3026 | sizeof(*ml_elem) + ml_common_len); | |
3027 | ||
3028 | new_ie[data.ielen + sizeof(*ml_elem) + 1 + ETH_ALEN] = link_id; | |
f8599d63 BB |
3029 | new_ie[data.ielen + sizeof(*ml_elem) + 1 + ETH_ALEN + 1] = |
3030 | param_ch_count; | |
5f478adf BB |
3031 | |
3032 | data.ielen += sizeof(*ml_elem) + ml_common_len; | |
3033 | ||
4d1d6b3f BB |
3034 | if (reporter_rnr && (use_for & NL80211_BSS_USE_FOR_NORMAL)) { |
3035 | if (data.ielen + sizeof(struct element) + | |
3036 | reporter_rnr->datalen > IEEE80211_MAX_DATA_LEN) | |
3037 | continue; | |
3038 | ||
3039 | memcpy(new_ie + data.ielen, reporter_rnr, | |
3040 | sizeof(struct element) + reporter_rnr->datalen); | |
3041 | data.ielen += sizeof(struct element) + | |
3042 | reporter_rnr->datalen; | |
3043 | } | |
5f478adf | 3044 | |
2481b5da BB |
3045 | bss = cfg80211_inform_single_bss_data(wiphy, &data, gfp); |
3046 | if (!bss) | |
3047 | break; | |
3048 | cfg80211_put_bss(wiphy, bss); | |
3049 | } | |
3050 | ||
3051 | out: | |
4d1d6b3f | 3052 | kfree(reporter_rnr); |
2481b5da BB |
3053 | kfree(new_ie); |
3054 | kfree(mle); | |
3055 | } | |
3056 | ||
d18125b6 BB |
3057 | static void cfg80211_parse_ml_sta_data(struct wiphy *wiphy, |
3058 | struct cfg80211_inform_single_bss_data *tx_data, | |
3059 | struct cfg80211_bss *source_bss, | |
3060 | gfp_t gfp) | |
3061 | { | |
3062 | const struct element *elem; | |
3063 | ||
3064 | if (!source_bss) | |
3065 | return; | |
3066 | ||
3067 | if (tx_data->ftype != CFG80211_BSS_FTYPE_PRESP) | |
3068 | return; | |
3069 | ||
3070 | for_each_element_extid(elem, WLAN_EID_EXT_EHT_MULTI_LINK, | |
3071 | tx_data->ie, tx_data->ielen) | |
3072 | cfg80211_parse_ml_elem_sta_data(wiphy, tx_data, source_bss, | |
3073 | elem, gfp); | |
3074 | } | |
3075 | ||
2a519311 | 3076 | struct cfg80211_bss * |
0b8fb823 PX |
3077 | cfg80211_inform_bss_data(struct wiphy *wiphy, |
3078 | struct cfg80211_inform_bss *data, | |
3079 | enum cfg80211_bss_frame_type ftype, | |
3080 | const u8 *bssid, u64 tsf, u16 capability, | |
3081 | u16 beacon_interval, const u8 *ie, size_t ielen, | |
3082 | gfp_t gfp) | |
3083 | { | |
eb142608 BB |
3084 | struct cfg80211_inform_single_bss_data inform_data = { |
3085 | .drv_data = data, | |
3086 | .ftype = ftype, | |
3087 | .tsf = tsf, | |
3088 | .capability = capability, | |
3089 | .beacon_interval = beacon_interval, | |
3090 | .ie = ie, | |
3091 | .ielen = ielen, | |
d02a12b8 JB |
3092 | .use_for = data->restrict_use ? |
3093 | data->use_for : | |
3094 | NL80211_BSS_USE_FOR_ALL, | |
3095 | .cannot_use_reasons = data->cannot_use_reasons, | |
eb142608 | 3096 | }; |
0b8fb823 PX |
3097 | struct cfg80211_bss *res; |
3098 | ||
eb142608 BB |
3099 | memcpy(inform_data.bssid, bssid, ETH_ALEN); |
3100 | ||
3101 | res = cfg80211_inform_single_bss_data(wiphy, &inform_data, gfp); | |
b0d1d7ff JB |
3102 | if (!res) |
3103 | return NULL; | |
eb142608 | 3104 | |
7e899c1d JB |
3105 | /* don't do any further MBSSID/ML handling for S1G */ |
3106 | if (ftype == CFG80211_BSS_FTYPE_S1G_BEACON) | |
3107 | return res; | |
3108 | ||
eb142608 | 3109 | cfg80211_parse_mbssid_data(wiphy, &inform_data, res, gfp); |
2481b5da BB |
3110 | |
3111 | cfg80211_parse_ml_sta_data(wiphy, &inform_data, res, gfp); | |
3112 | ||
0b8fb823 PX |
3113 | return res; |
3114 | } | |
3115 | EXPORT_SYMBOL(cfg80211_inform_bss_data); | |
3116 | ||
317bad4c JB |
3117 | struct cfg80211_bss * |
3118 | cfg80211_inform_bss_frame_data(struct wiphy *wiphy, | |
3119 | struct cfg80211_inform_bss *data, | |
3120 | struct ieee80211_mgmt *mgmt, size_t len, | |
3121 | gfp_t gfp) | |
2a519311 | 3122 | { |
317bad4c JB |
3123 | size_t min_hdr_len = offsetof(struct ieee80211_mgmt, |
3124 | u.probe_resp.variable); | |
9eaffe50 | 3125 | struct ieee80211_ext *ext = NULL; |
7e899c1d JB |
3126 | enum cfg80211_bss_frame_type ftype; |
3127 | u16 beacon_interval; | |
3128 | const u8 *bssid; | |
3129 | u16 capability; | |
3130 | const u8 *ie; | |
3131 | size_t ielen; | |
3132 | u64 tsf; | |
4ee3e063 | 3133 | |
bef9bacc MK |
3134 | if (WARN_ON(!mgmt)) |
3135 | return NULL; | |
3136 | ||
3137 | if (WARN_ON(!wiphy)) | |
3138 | return NULL; | |
2a519311 | 3139 | |
317bad4c JB |
3140 | BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) != |
3141 | offsetof(struct ieee80211_mgmt, u.beacon.variable)); | |
3142 | ||
3143 | trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len); | |
2a519311 | 3144 | |
9eaffe50 TP |
3145 | if (ieee80211_is_s1g_beacon(mgmt->frame_control)) { |
3146 | ext = (void *) mgmt; | |
3147 | min_hdr_len = offsetof(struct ieee80211_ext, u.s1g_beacon); | |
3148 | if (ieee80211_is_s1g_short_beacon(mgmt->frame_control)) | |
3149 | min_hdr_len = offsetof(struct ieee80211_ext, | |
3150 | u.s1g_short_beacon.variable); | |
3151 | } | |
3152 | ||
3153 | if (WARN_ON(len < min_hdr_len)) | |
2a519311 JB |
3154 | return NULL; |
3155 | ||
7e899c1d JB |
3156 | ielen = len - min_hdr_len; |
3157 | ie = mgmt->u.probe_resp.variable; | |
9eaffe50 | 3158 | if (ext) { |
b5ac0146 JB |
3159 | const struct ieee80211_s1g_bcn_compat_ie *compat; |
3160 | const struct element *elem; | |
9eaffe50 | 3161 | |
317bad4c | 3162 | if (ieee80211_is_s1g_short_beacon(mgmt->frame_control)) |
7e899c1d | 3163 | ie = ext->u.s1g_short_beacon.variable; |
317bad4c | 3164 | else |
7e899c1d | 3165 | ie = ext->u.s1g_beacon.variable; |
317bad4c | 3166 | |
7e899c1d | 3167 | elem = cfg80211_find_elem(WLAN_EID_S1G_BCN_COMPAT, ie, ielen); |
b5ac0146 JB |
3168 | if (!elem) |
3169 | return NULL; | |
3170 | if (elem->datalen < sizeof(*compat)) | |
9eaffe50 | 3171 | return NULL; |
b5ac0146 | 3172 | compat = (void *)elem->data; |
7e899c1d JB |
3173 | bssid = ext->u.s1g_beacon.sa; |
3174 | capability = le16_to_cpu(compat->compat_info); | |
3175 | beacon_interval = le16_to_cpu(compat->beacon_int); | |
9eaffe50 | 3176 | } else { |
7e899c1d JB |
3177 | bssid = mgmt->bssid; |
3178 | beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); | |
3179 | capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); | |
9eaffe50 TP |
3180 | } |
3181 | ||
7e899c1d | 3182 | tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); |
2a519311 | 3183 | |
9caf0364 | 3184 | if (ieee80211_is_probe_resp(mgmt->frame_control)) |
7e899c1d JB |
3185 | ftype = CFG80211_BSS_FTYPE_PRESP; |
3186 | else if (ext) | |
3187 | ftype = CFG80211_BSS_FTYPE_S1G_BEACON; | |
9caf0364 | 3188 | else |
7e899c1d | 3189 | ftype = CFG80211_BSS_FTYPE_BEACON; |
0b8fb823 | 3190 | |
7e899c1d JB |
3191 | return cfg80211_inform_bss_data(wiphy, data, ftype, |
3192 | bssid, tsf, capability, | |
3193 | beacon_interval, ie, ielen, | |
3194 | gfp); | |
0b8fb823 | 3195 | } |
6e19bc4b | 3196 | EXPORT_SYMBOL(cfg80211_inform_bss_frame_data); |
2a519311 | 3197 | |
5b112d3d | 3198 | void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
4c0c0b75 | 3199 | { |
f26cbf40 | 3200 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
4c0c0b75 JB |
3201 | |
3202 | if (!pub) | |
3203 | return; | |
3204 | ||
1b8ec87a | 3205 | spin_lock_bh(&rdev->bss_lock); |
61e41e5d | 3206 | bss_ref_get(rdev, bss_from_pub(pub)); |
1b8ec87a | 3207 | spin_unlock_bh(&rdev->bss_lock); |
4c0c0b75 JB |
3208 | } |
3209 | EXPORT_SYMBOL(cfg80211_ref_bss); | |
3210 | ||
5b112d3d | 3211 | void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
2a519311 | 3212 | { |
f26cbf40 | 3213 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
2a519311 JB |
3214 | |
3215 | if (!pub) | |
3216 | return; | |
3217 | ||
1b8ec87a | 3218 | spin_lock_bh(&rdev->bss_lock); |
61e41e5d | 3219 | bss_ref_put(rdev, bss_from_pub(pub)); |
1b8ec87a | 3220 | spin_unlock_bh(&rdev->bss_lock); |
2a519311 JB |
3221 | } |
3222 | EXPORT_SYMBOL(cfg80211_put_bss); | |
3223 | ||
d491af19 JB |
3224 | void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
3225 | { | |
f26cbf40 | 3226 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
7011ba58 SS |
3227 | struct cfg80211_internal_bss *bss, *tmp1; |
3228 | struct cfg80211_bss *nontrans_bss, *tmp; | |
d491af19 JB |
3229 | |
3230 | if (WARN_ON(!pub)) | |
3231 | return; | |
3232 | ||
61e41e5d | 3233 | bss = bss_from_pub(pub); |
d491af19 | 3234 | |
1b8ec87a | 3235 | spin_lock_bh(&rdev->bss_lock); |
7011ba58 SS |
3236 | if (list_empty(&bss->list)) |
3237 | goto out; | |
3238 | ||
3239 | list_for_each_entry_safe(nontrans_bss, tmp, | |
3240 | &pub->nontrans_list, | |
3241 | nontrans_list) { | |
61e41e5d | 3242 | tmp1 = bss_from_pub(nontrans_bss); |
7011ba58 | 3243 | if (__cfg80211_unlink_bss(rdev, tmp1)) |
1b8ec87a | 3244 | rdev->bss_generation++; |
3207390a | 3245 | } |
7011ba58 SS |
3246 | |
3247 | if (__cfg80211_unlink_bss(rdev, bss)) | |
3248 | rdev->bss_generation++; | |
3249 | out: | |
1b8ec87a | 3250 | spin_unlock_bh(&rdev->bss_lock); |
d491af19 JB |
3251 | } |
3252 | EXPORT_SYMBOL(cfg80211_unlink_bss); | |
3253 | ||
4770c8f9 IP |
3254 | void cfg80211_bss_iter(struct wiphy *wiphy, |
3255 | struct cfg80211_chan_def *chandef, | |
3256 | void (*iter)(struct wiphy *wiphy, | |
3257 | struct cfg80211_bss *bss, | |
3258 | void *data), | |
3259 | void *iter_data) | |
3260 | { | |
3261 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); | |
3262 | struct cfg80211_internal_bss *bss; | |
3263 | ||
3264 | spin_lock_bh(&rdev->bss_lock); | |
3265 | ||
3266 | list_for_each_entry(bss, &rdev->bss_list, list) { | |
7b0a0e3c JB |
3267 | if (!chandef || cfg80211_is_sub_chan(chandef, bss->pub.channel, |
3268 | false)) | |
4770c8f9 IP |
3269 | iter(wiphy, &bss->pub, iter_data); |
3270 | } | |
3271 | ||
3272 | spin_unlock_bh(&rdev->bss_lock); | |
3273 | } | |
3274 | EXPORT_SYMBOL(cfg80211_bss_iter); | |
3275 | ||
0afd425b | 3276 | void cfg80211_update_assoc_bss_entry(struct wireless_dev *wdev, |
7b0a0e3c | 3277 | unsigned int link_id, |
0afd425b SM |
3278 | struct ieee80211_channel *chan) |
3279 | { | |
3280 | struct wiphy *wiphy = wdev->wiphy; | |
3281 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); | |
7b0a0e3c | 3282 | struct cfg80211_internal_bss *cbss = wdev->links[link_id].client.current_bss; |
0afd425b SM |
3283 | struct cfg80211_internal_bss *new = NULL; |
3284 | struct cfg80211_internal_bss *bss; | |
3285 | struct cfg80211_bss *nontrans_bss; | |
3286 | struct cfg80211_bss *tmp; | |
3287 | ||
3288 | spin_lock_bh(&rdev->bss_lock); | |
3289 | ||
05dcb8bb IP |
3290 | /* |
3291 | * Some APs use CSA also for bandwidth changes, i.e., without actually | |
3292 | * changing the control channel, so no need to update in such a case. | |
3293 | */ | |
3294 | if (cbss->pub.channel == chan) | |
0afd425b SM |
3295 | goto done; |
3296 | ||
3297 | /* use transmitting bss */ | |
3298 | if (cbss->pub.transmitted_bss) | |
61e41e5d | 3299 | cbss = bss_from_pub(cbss->pub.transmitted_bss); |
0afd425b SM |
3300 | |
3301 | cbss->pub.channel = chan; | |
3302 | ||
3303 | list_for_each_entry(bss, &rdev->bss_list, list) { | |
3304 | if (!cfg80211_bss_type_match(bss->pub.capability, | |
3305 | bss->pub.channel->band, | |
3306 | wdev->conn_bss_type)) | |
3307 | continue; | |
3308 | ||
3309 | if (bss == cbss) | |
3310 | continue; | |
3311 | ||
3312 | if (!cmp_bss(&bss->pub, &cbss->pub, BSS_CMP_REGULAR)) { | |
3313 | new = bss; | |
3314 | break; | |
3315 | } | |
3316 | } | |
3317 | ||
3318 | if (new) { | |
3319 | /* to save time, update IEs for transmitting bss only */ | |
acc44cbd BB |
3320 | cfg80211_update_known_bss(rdev, cbss, new, false); |
3321 | new->pub.proberesp_ies = NULL; | |
3322 | new->pub.beacon_ies = NULL; | |
0afd425b SM |
3323 | |
3324 | list_for_each_entry_safe(nontrans_bss, tmp, | |
3325 | &new->pub.nontrans_list, | |
3326 | nontrans_list) { | |
61e41e5d | 3327 | bss = bss_from_pub(nontrans_bss); |
0afd425b SM |
3328 | if (__cfg80211_unlink_bss(rdev, bss)) |
3329 | rdev->bss_generation++; | |
3330 | } | |
3331 | ||
3332 | WARN_ON(atomic_read(&new->hold)); | |
3333 | if (!WARN_ON(!__cfg80211_unlink_bss(rdev, new))) | |
3334 | rdev->bss_generation++; | |
3335 | } | |
3336 | ||
3337 | rb_erase(&cbss->rbn, &rdev->bss_tree); | |
3338 | rb_insert_bss(rdev, cbss); | |
3339 | rdev->bss_generation++; | |
3340 | ||
3341 | list_for_each_entry_safe(nontrans_bss, tmp, | |
3342 | &cbss->pub.nontrans_list, | |
3343 | nontrans_list) { | |
61e41e5d | 3344 | bss = bss_from_pub(nontrans_bss); |
0afd425b SM |
3345 | bss->pub.channel = chan; |
3346 | rb_erase(&bss->rbn, &rdev->bss_tree); | |
3347 | rb_insert_bss(rdev, bss); | |
3348 | rdev->bss_generation++; | |
3349 | } | |
3350 | ||
3351 | done: | |
3352 | spin_unlock_bh(&rdev->bss_lock); | |
3353 | } | |
3354 | ||
3d23e349 | 3355 | #ifdef CONFIG_CFG80211_WEXT |
9f419f38 JB |
3356 | static struct cfg80211_registered_device * |
3357 | cfg80211_get_dev_from_ifindex(struct net *net, int ifindex) | |
3358 | { | |
5fe231e8 | 3359 | struct cfg80211_registered_device *rdev; |
9f419f38 JB |
3360 | struct net_device *dev; |
3361 | ||
5fe231e8 JB |
3362 | ASSERT_RTNL(); |
3363 | ||
9f419f38 JB |
3364 | dev = dev_get_by_index(net, ifindex); |
3365 | if (!dev) | |
5fe231e8 JB |
3366 | return ERR_PTR(-ENODEV); |
3367 | if (dev->ieee80211_ptr) | |
f26cbf40 | 3368 | rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy); |
5fe231e8 | 3369 | else |
9f419f38 JB |
3370 | rdev = ERR_PTR(-ENODEV); |
3371 | dev_put(dev); | |
9f419f38 JB |
3372 | return rdev; |
3373 | } | |
3374 | ||
2a519311 JB |
3375 | int cfg80211_wext_siwscan(struct net_device *dev, |
3376 | struct iw_request_info *info, | |
3377 | union iwreq_data *wrqu, char *extra) | |
3378 | { | |
3379 | struct cfg80211_registered_device *rdev; | |
3380 | struct wiphy *wiphy; | |
3381 | struct iw_scan_req *wreq = NULL; | |
3536672b | 3382 | struct cfg80211_scan_request *creq; |
2a519311 | 3383 | int i, err, n_channels = 0; |
57fbcce3 | 3384 | enum nl80211_band band; |
2a519311 JB |
3385 | |
3386 | if (!netif_running(dev)) | |
3387 | return -ENETDOWN; | |
3388 | ||
b2e3abdc HS |
3389 | if (wrqu->data.length == sizeof(struct iw_scan_req)) |
3390 | wreq = (struct iw_scan_req *)extra; | |
3391 | ||
463d0183 | 3392 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
3393 | |
3394 | if (IS_ERR(rdev)) | |
3395 | return PTR_ERR(rdev); | |
3396 | ||
3536672b | 3397 | if (rdev->scan_req || rdev->scan_msg) |
3398 | return -EBUSY; | |
2a519311 JB |
3399 | |
3400 | wiphy = &rdev->wiphy; | |
3401 | ||
b2e3abdc HS |
3402 | /* Determine number of channels, needed to allocate creq */ |
3403 | if (wreq && wreq->num_channels) | |
3404 | n_channels = wreq->num_channels; | |
bdfbec2d IP |
3405 | else |
3406 | n_channels = ieee80211_get_num_supported_channels(wiphy); | |
2a519311 JB |
3407 | |
3408 | creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + | |
3409 | n_channels * sizeof(void *), | |
3410 | GFP_ATOMIC); | |
3536672b | 3411 | if (!creq) |
3412 | return -ENOMEM; | |
2a519311 JB |
3413 | |
3414 | creq->wiphy = wiphy; | |
fd014284 | 3415 | creq->wdev = dev->ieee80211_ptr; |
5ba63533 JB |
3416 | /* SSIDs come after channels */ |
3417 | creq->ssids = (void *)&creq->channels[n_channels]; | |
2a519311 JB |
3418 | creq->n_channels = n_channels; |
3419 | creq->n_ssids = 1; | |
15d6030b | 3420 | creq->scan_start = jiffies; |
2a519311 | 3421 | |
b2e3abdc | 3422 | /* translate "Scan on frequencies" request */ |
2a519311 | 3423 | i = 0; |
57fbcce3 | 3424 | for (band = 0; band < NUM_NL80211_BANDS; band++) { |
2a519311 | 3425 | int j; |
584991dc | 3426 | |
2a519311 JB |
3427 | if (!wiphy->bands[band]) |
3428 | continue; | |
584991dc | 3429 | |
2a519311 | 3430 | for (j = 0; j < wiphy->bands[band]->n_channels; j++) { |
584991dc JB |
3431 | /* ignore disabled channels */ |
3432 | if (wiphy->bands[band]->channels[j].flags & | |
3433 | IEEE80211_CHAN_DISABLED) | |
3434 | continue; | |
b2e3abdc HS |
3435 | |
3436 | /* If we have a wireless request structure and the | |
3437 | * wireless request specifies frequencies, then search | |
3438 | * for the matching hardware channel. | |
3439 | */ | |
3440 | if (wreq && wreq->num_channels) { | |
3441 | int k; | |
3442 | int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; | |
3443 | for (k = 0; k < wreq->num_channels; k++) { | |
96998e3a ZG |
3444 | struct iw_freq *freq = |
3445 | &wreq->channel_list[k]; | |
3446 | int wext_freq = | |
3447 | cfg80211_wext_freq(freq); | |
3448 | ||
b2e3abdc HS |
3449 | if (wext_freq == wiphy_freq) |
3450 | goto wext_freq_found; | |
3451 | } | |
3452 | goto wext_freq_not_found; | |
3453 | } | |
3454 | ||
3455 | wext_freq_found: | |
2a519311 JB |
3456 | creq->channels[i] = &wiphy->bands[band]->channels[j]; |
3457 | i++; | |
b2e3abdc | 3458 | wext_freq_not_found: ; |
2a519311 JB |
3459 | } |
3460 | } | |
8862dc5f HS |
3461 | /* No channels found? */ |
3462 | if (!i) { | |
3463 | err = -EINVAL; | |
3464 | goto out; | |
3465 | } | |
2a519311 | 3466 | |
b2e3abdc HS |
3467 | /* Set real number of channels specified in creq->channels[] */ |
3468 | creq->n_channels = i; | |
2a519311 | 3469 | |
b2e3abdc HS |
3470 | /* translate "Scan for SSID" request */ |
3471 | if (wreq) { | |
2a519311 | 3472 | if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { |
65486c8b JB |
3473 | if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { |
3474 | err = -EINVAL; | |
3475 | goto out; | |
3476 | } | |
2a519311 JB |
3477 | memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); |
3478 | creq->ssids[0].ssid_len = wreq->essid_len; | |
3479 | } | |
3480 | if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) | |
3481 | creq->n_ssids = 0; | |
3482 | } | |
3483 | ||
57fbcce3 | 3484 | for (i = 0; i < NUM_NL80211_BANDS; i++) |
a401d2bb JB |
3485 | if (wiphy->bands[i]) |
3486 | creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1; | |
34850ab2 | 3487 | |
818965d3 JM |
3488 | eth_broadcast_addr(creq->bssid); |
3489 | ||
a05829a7 JB |
3490 | wiphy_lock(&rdev->wiphy); |
3491 | ||
2a519311 | 3492 | rdev->scan_req = creq; |
e35e4d28 | 3493 | err = rdev_scan(rdev, creq); |
2a519311 JB |
3494 | if (err) { |
3495 | rdev->scan_req = NULL; | |
65486c8b | 3496 | /* creq will be freed below */ |
463d0183 | 3497 | } else { |
fd014284 | 3498 | nl80211_send_scan_start(rdev, dev->ieee80211_ptr); |
65486c8b JB |
3499 | /* creq now owned by driver */ |
3500 | creq = NULL; | |
463d0183 JB |
3501 | dev_hold(dev); |
3502 | } | |
a05829a7 | 3503 | wiphy_unlock(&rdev->wiphy); |
2a519311 | 3504 | out: |
65486c8b | 3505 | kfree(creq); |
2a519311 JB |
3506 | return err; |
3507 | } | |
2afe38d1 | 3508 | EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan); |
2a519311 | 3509 | |
76a70e9c JM |
3510 | static char *ieee80211_scan_add_ies(struct iw_request_info *info, |
3511 | const struct cfg80211_bss_ies *ies, | |
3512 | char *current_ev, char *end_buf) | |
2a519311 | 3513 | { |
9caf0364 | 3514 | const u8 *pos, *end, *next; |
2a519311 JB |
3515 | struct iw_event iwe; |
3516 | ||
9caf0364 | 3517 | if (!ies) |
76a70e9c | 3518 | return current_ev; |
2a519311 JB |
3519 | |
3520 | /* | |
3521 | * If needed, fragment the IEs buffer (at IE boundaries) into short | |
3522 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. | |
3523 | */ | |
9caf0364 JB |
3524 | pos = ies->data; |
3525 | end = pos + ies->len; | |
2a519311 JB |
3526 | |
3527 | while (end - pos > IW_GENERIC_IE_MAX) { | |
3528 | next = pos + 2 + pos[1]; | |
3529 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) | |
3530 | next = next + 2 + next[1]; | |
3531 | ||
3532 | memset(&iwe, 0, sizeof(iwe)); | |
3533 | iwe.cmd = IWEVGENIE; | |
3534 | iwe.u.data.length = next - pos; | |
76a70e9c JM |
3535 | current_ev = iwe_stream_add_point_check(info, current_ev, |
3536 | end_buf, &iwe, | |
3537 | (void *)pos); | |
3538 | if (IS_ERR(current_ev)) | |
3539 | return current_ev; | |
2a519311 JB |
3540 | pos = next; |
3541 | } | |
3542 | ||
3543 | if (end > pos) { | |
3544 | memset(&iwe, 0, sizeof(iwe)); | |
3545 | iwe.cmd = IWEVGENIE; | |
3546 | iwe.u.data.length = end - pos; | |
76a70e9c JM |
3547 | current_ev = iwe_stream_add_point_check(info, current_ev, |
3548 | end_buf, &iwe, | |
3549 | (void *)pos); | |
3550 | if (IS_ERR(current_ev)) | |
3551 | return current_ev; | |
2a519311 | 3552 | } |
76a70e9c JM |
3553 | |
3554 | return current_ev; | |
2a519311 JB |
3555 | } |
3556 | ||
2a519311 | 3557 | static char * |
77965c97 JB |
3558 | ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, |
3559 | struct cfg80211_internal_bss *bss, char *current_ev, | |
3560 | char *end_buf) | |
2a519311 | 3561 | { |
9caf0364 | 3562 | const struct cfg80211_bss_ies *ies; |
2a519311 | 3563 | struct iw_event iwe; |
9caf0364 | 3564 | const u8 *ie; |
76a70e9c JM |
3565 | u8 buf[50]; |
3566 | u8 *cfg, *p, *tmp; | |
9caf0364 | 3567 | int rem, i, sig; |
2a519311 JB |
3568 | bool ismesh = false; |
3569 | ||
3570 | memset(&iwe, 0, sizeof(iwe)); | |
3571 | iwe.cmd = SIOCGIWAP; | |
3572 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; | |
3573 | memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); | |
76a70e9c JM |
3574 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
3575 | IW_EV_ADDR_LEN); | |
3576 | if (IS_ERR(current_ev)) | |
3577 | return current_ev; | |
2a519311 JB |
3578 | |
3579 | memset(&iwe, 0, sizeof(iwe)); | |
3580 | iwe.cmd = SIOCGIWFREQ; | |
3581 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); | |
3582 | iwe.u.freq.e = 0; | |
76a70e9c JM |
3583 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
3584 | IW_EV_FREQ_LEN); | |
3585 | if (IS_ERR(current_ev)) | |
3586 | return current_ev; | |
2a519311 JB |
3587 | |
3588 | memset(&iwe, 0, sizeof(iwe)); | |
3589 | iwe.cmd = SIOCGIWFREQ; | |
3590 | iwe.u.freq.m = bss->pub.channel->center_freq; | |
3591 | iwe.u.freq.e = 6; | |
76a70e9c JM |
3592 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
3593 | IW_EV_FREQ_LEN); | |
3594 | if (IS_ERR(current_ev)) | |
3595 | return current_ev; | |
2a519311 | 3596 | |
77965c97 | 3597 | if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { |
2a519311 JB |
3598 | memset(&iwe, 0, sizeof(iwe)); |
3599 | iwe.cmd = IWEVQUAL; | |
3600 | iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | | |
3601 | IW_QUAL_NOISE_INVALID | | |
a77b8552 | 3602 | IW_QUAL_QUAL_UPDATED; |
77965c97 | 3603 | switch (wiphy->signal_type) { |
2a519311 | 3604 | case CFG80211_SIGNAL_TYPE_MBM: |
a77b8552 JB |
3605 | sig = bss->pub.signal / 100; |
3606 | iwe.u.qual.level = sig; | |
2a519311 | 3607 | iwe.u.qual.updated |= IW_QUAL_DBM; |
a77b8552 JB |
3608 | if (sig < -110) /* rather bad */ |
3609 | sig = -110; | |
3610 | else if (sig > -40) /* perfect */ | |
3611 | sig = -40; | |
3612 | /* will give a range of 0 .. 70 */ | |
3613 | iwe.u.qual.qual = sig + 110; | |
2a519311 JB |
3614 | break; |
3615 | case CFG80211_SIGNAL_TYPE_UNSPEC: | |
3616 | iwe.u.qual.level = bss->pub.signal; | |
a77b8552 JB |
3617 | /* will give range 0 .. 100 */ |
3618 | iwe.u.qual.qual = bss->pub.signal; | |
2a519311 JB |
3619 | break; |
3620 | default: | |
3621 | /* not reached */ | |
3622 | break; | |
3623 | } | |
76a70e9c JM |
3624 | current_ev = iwe_stream_add_event_check(info, current_ev, |
3625 | end_buf, &iwe, | |
3626 | IW_EV_QUAL_LEN); | |
3627 | if (IS_ERR(current_ev)) | |
3628 | return current_ev; | |
2a519311 JB |
3629 | } |
3630 | ||
3631 | memset(&iwe, 0, sizeof(iwe)); | |
3632 | iwe.cmd = SIOCGIWENCODE; | |
3633 | if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) | |
3634 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; | |
3635 | else | |
3636 | iwe.u.data.flags = IW_ENCODE_DISABLED; | |
3637 | iwe.u.data.length = 0; | |
76a70e9c JM |
3638 | current_ev = iwe_stream_add_point_check(info, current_ev, end_buf, |
3639 | &iwe, ""); | |
3640 | if (IS_ERR(current_ev)) | |
3641 | return current_ev; | |
2a519311 | 3642 | |
9caf0364 JB |
3643 | rcu_read_lock(); |
3644 | ies = rcu_dereference(bss->pub.ies); | |
83c7aa1a JB |
3645 | rem = ies->len; |
3646 | ie = ies->data; | |
9caf0364 | 3647 | |
83c7aa1a | 3648 | while (rem >= 2) { |
2a519311 JB |
3649 | /* invalid data */ |
3650 | if (ie[1] > rem - 2) | |
3651 | break; | |
3652 | ||
3653 | switch (ie[0]) { | |
3654 | case WLAN_EID_SSID: | |
3655 | memset(&iwe, 0, sizeof(iwe)); | |
3656 | iwe.cmd = SIOCGIWESSID; | |
3657 | iwe.u.data.length = ie[1]; | |
3658 | iwe.u.data.flags = 1; | |
76a70e9c JM |
3659 | current_ev = iwe_stream_add_point_check(info, |
3660 | current_ev, | |
3661 | end_buf, &iwe, | |
3662 | (u8 *)ie + 2); | |
3663 | if (IS_ERR(current_ev)) | |
3664 | goto unlock; | |
2a519311 JB |
3665 | break; |
3666 | case WLAN_EID_MESH_ID: | |
3667 | memset(&iwe, 0, sizeof(iwe)); | |
3668 | iwe.cmd = SIOCGIWESSID; | |
3669 | iwe.u.data.length = ie[1]; | |
3670 | iwe.u.data.flags = 1; | |
76a70e9c JM |
3671 | current_ev = iwe_stream_add_point_check(info, |
3672 | current_ev, | |
3673 | end_buf, &iwe, | |
3674 | (u8 *)ie + 2); | |
3675 | if (IS_ERR(current_ev)) | |
3676 | goto unlock; | |
2a519311 JB |
3677 | break; |
3678 | case WLAN_EID_MESH_CONFIG: | |
3679 | ismesh = true; | |
136cfa28 | 3680 | if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) |
2a519311 | 3681 | break; |
9caf0364 | 3682 | cfg = (u8 *)ie + 2; |
2a519311 JB |
3683 | memset(&iwe, 0, sizeof(iwe)); |
3684 | iwe.cmd = IWEVCUSTOM; | |
22446b7e DA |
3685 | iwe.u.data.length = sprintf(buf, |
3686 | "Mesh Network Path Selection Protocol ID: 0x%02X", | |
3687 | cfg[0]); | |
76a70e9c JM |
3688 | current_ev = iwe_stream_add_point_check(info, |
3689 | current_ev, | |
3690 | end_buf, | |
3691 | &iwe, buf); | |
3692 | if (IS_ERR(current_ev)) | |
3693 | goto unlock; | |
22446b7e DA |
3694 | iwe.u.data.length = sprintf(buf, |
3695 | "Path Selection Metric ID: 0x%02X", | |
3696 | cfg[1]); | |
76a70e9c JM |
3697 | current_ev = iwe_stream_add_point_check(info, |
3698 | current_ev, | |
3699 | end_buf, | |
3700 | &iwe, buf); | |
3701 | if (IS_ERR(current_ev)) | |
3702 | goto unlock; | |
22446b7e DA |
3703 | iwe.u.data.length = sprintf(buf, |
3704 | "Congestion Control Mode ID: 0x%02X", | |
3705 | cfg[2]); | |
76a70e9c JM |
3706 | current_ev = iwe_stream_add_point_check(info, |
3707 | current_ev, | |
3708 | end_buf, | |
3709 | &iwe, buf); | |
3710 | if (IS_ERR(current_ev)) | |
3711 | goto unlock; | |
22446b7e DA |
3712 | iwe.u.data.length = sprintf(buf, |
3713 | "Synchronization ID: 0x%02X", | |
3714 | cfg[3]); | |
76a70e9c JM |
3715 | current_ev = iwe_stream_add_point_check(info, |
3716 | current_ev, | |
3717 | end_buf, | |
3718 | &iwe, buf); | |
3719 | if (IS_ERR(current_ev)) | |
3720 | goto unlock; | |
22446b7e DA |
3721 | iwe.u.data.length = sprintf(buf, |
3722 | "Authentication ID: 0x%02X", | |
3723 | cfg[4]); | |
76a70e9c JM |
3724 | current_ev = iwe_stream_add_point_check(info, |
3725 | current_ev, | |
3726 | end_buf, | |
3727 | &iwe, buf); | |
3728 | if (IS_ERR(current_ev)) | |
3729 | goto unlock; | |
22446b7e DA |
3730 | iwe.u.data.length = sprintf(buf, |
3731 | "Formation Info: 0x%02X", | |
3732 | cfg[5]); | |
76a70e9c JM |
3733 | current_ev = iwe_stream_add_point_check(info, |
3734 | current_ev, | |
3735 | end_buf, | |
3736 | &iwe, buf); | |
3737 | if (IS_ERR(current_ev)) | |
3738 | goto unlock; | |
22446b7e DA |
3739 | iwe.u.data.length = sprintf(buf, |
3740 | "Capabilities: 0x%02X", | |
3741 | cfg[6]); | |
76a70e9c JM |
3742 | current_ev = iwe_stream_add_point_check(info, |
3743 | current_ev, | |
3744 | end_buf, | |
3745 | &iwe, buf); | |
3746 | if (IS_ERR(current_ev)) | |
3747 | goto unlock; | |
2a519311 JB |
3748 | break; |
3749 | case WLAN_EID_SUPP_RATES: | |
3750 | case WLAN_EID_EXT_SUPP_RATES: | |
3751 | /* display all supported rates in readable format */ | |
3752 | p = current_ev + iwe_stream_lcp_len(info); | |
3753 | ||
3754 | memset(&iwe, 0, sizeof(iwe)); | |
3755 | iwe.cmd = SIOCGIWRATE; | |
3756 | /* Those two flags are ignored... */ | |
3757 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; | |
3758 | ||
3759 | for (i = 0; i < ie[1]; i++) { | |
3760 | iwe.u.bitrate.value = | |
3761 | ((ie[i + 2] & 0x7f) * 500000); | |
76a70e9c | 3762 | tmp = p; |
2a519311 | 3763 | p = iwe_stream_add_value(info, current_ev, p, |
76a70e9c JM |
3764 | end_buf, &iwe, |
3765 | IW_EV_PARAM_LEN); | |
3766 | if (p == tmp) { | |
3767 | current_ev = ERR_PTR(-E2BIG); | |
3768 | goto unlock; | |
3769 | } | |
2a519311 JB |
3770 | } |
3771 | current_ev = p; | |
3772 | break; | |
3773 | } | |
3774 | rem -= ie[1] + 2; | |
3775 | ie += ie[1] + 2; | |
3776 | } | |
3777 | ||
f64f9e71 JP |
3778 | if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || |
3779 | ismesh) { | |
2a519311 JB |
3780 | memset(&iwe, 0, sizeof(iwe)); |
3781 | iwe.cmd = SIOCGIWMODE; | |
3782 | if (ismesh) | |
3783 | iwe.u.mode = IW_MODE_MESH; | |
3784 | else if (bss->pub.capability & WLAN_CAPABILITY_ESS) | |
3785 | iwe.u.mode = IW_MODE_MASTER; | |
3786 | else | |
3787 | iwe.u.mode = IW_MODE_ADHOC; | |
76a70e9c JM |
3788 | current_ev = iwe_stream_add_event_check(info, current_ev, |
3789 | end_buf, &iwe, | |
3790 | IW_EV_UINT_LEN); | |
3791 | if (IS_ERR(current_ev)) | |
3792 | goto unlock; | |
2a519311 JB |
3793 | } |
3794 | ||
76a70e9c JM |
3795 | memset(&iwe, 0, sizeof(iwe)); |
3796 | iwe.cmd = IWEVCUSTOM; | |
22446b7e DA |
3797 | iwe.u.data.length = sprintf(buf, "tsf=%016llx", |
3798 | (unsigned long long)(ies->tsf)); | |
76a70e9c JM |
3799 | current_ev = iwe_stream_add_point_check(info, current_ev, end_buf, |
3800 | &iwe, buf); | |
3801 | if (IS_ERR(current_ev)) | |
3802 | goto unlock; | |
3803 | memset(&iwe, 0, sizeof(iwe)); | |
3804 | iwe.cmd = IWEVCUSTOM; | |
22446b7e DA |
3805 | iwe.u.data.length = sprintf(buf, " Last beacon: %ums ago", |
3806 | elapsed_jiffies_msecs(bss->ts)); | |
76a70e9c JM |
3807 | current_ev = iwe_stream_add_point_check(info, current_ev, |
3808 | end_buf, &iwe, buf); | |
3809 | if (IS_ERR(current_ev)) | |
3810 | goto unlock; | |
3811 | ||
3812 | current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf); | |
3813 | ||
3814 | unlock: | |
9caf0364 | 3815 | rcu_read_unlock(); |
2a519311 JB |
3816 | return current_ev; |
3817 | } | |
3818 | ||
3819 | ||
1b8ec87a | 3820 | static int ieee80211_scan_results(struct cfg80211_registered_device *rdev, |
2a519311 JB |
3821 | struct iw_request_info *info, |
3822 | char *buf, size_t len) | |
3823 | { | |
3824 | char *current_ev = buf; | |
3825 | char *end_buf = buf + len; | |
3826 | struct cfg80211_internal_bss *bss; | |
76a70e9c | 3827 | int err = 0; |
2a519311 | 3828 | |
1b8ec87a ZG |
3829 | spin_lock_bh(&rdev->bss_lock); |
3830 | cfg80211_bss_expire(rdev); | |
2a519311 | 3831 | |
1b8ec87a | 3832 | list_for_each_entry(bss, &rdev->bss_list, list) { |
2a519311 | 3833 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { |
76a70e9c JM |
3834 | err = -E2BIG; |
3835 | break; | |
2a519311 | 3836 | } |
1b8ec87a | 3837 | current_ev = ieee80211_bss(&rdev->wiphy, info, bss, |
77965c97 | 3838 | current_ev, end_buf); |
76a70e9c JM |
3839 | if (IS_ERR(current_ev)) { |
3840 | err = PTR_ERR(current_ev); | |
3841 | break; | |
3842 | } | |
2a519311 | 3843 | } |
1b8ec87a | 3844 | spin_unlock_bh(&rdev->bss_lock); |
76a70e9c JM |
3845 | |
3846 | if (err) | |
3847 | return err; | |
2a519311 JB |
3848 | return current_ev - buf; |
3849 | } | |
3850 | ||
3851 | ||
3852 | int cfg80211_wext_giwscan(struct net_device *dev, | |
3853 | struct iw_request_info *info, | |
02ae6a70 | 3854 | union iwreq_data *wrqu, char *extra) |
2a519311 | 3855 | { |
02ae6a70 | 3856 | struct iw_point *data = &wrqu->data; |
2a519311 JB |
3857 | struct cfg80211_registered_device *rdev; |
3858 | int res; | |
3859 | ||
3860 | if (!netif_running(dev)) | |
3861 | return -ENETDOWN; | |
3862 | ||
463d0183 | 3863 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
3864 | |
3865 | if (IS_ERR(rdev)) | |
3866 | return PTR_ERR(rdev); | |
3867 | ||
f9d15d16 | 3868 | if (rdev->scan_req || rdev->scan_msg) |
5fe231e8 | 3869 | return -EAGAIN; |
2a519311 JB |
3870 | |
3871 | res = ieee80211_scan_results(rdev, info, extra, data->length); | |
3872 | data->length = 0; | |
3873 | if (res >= 0) { | |
3874 | data->length = res; | |
3875 | res = 0; | |
3876 | } | |
3877 | ||
2a519311 JB |
3878 | return res; |
3879 | } | |
2afe38d1 | 3880 | EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan); |
2a519311 | 3881 | #endif |