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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 |
7b0a0e3c | 8 | * Copyright (C) 2018-2022 Intel Corporation |
2a519311 JB |
9 | */ |
10 | #include <linux/kernel.h> | |
5a0e3ad6 | 11 | #include <linux/slab.h> |
2a519311 JB |
12 | #include <linux/module.h> |
13 | #include <linux/netdevice.h> | |
14 | #include <linux/wireless.h> | |
15 | #include <linux/nl80211.h> | |
16 | #include <linux/etherdevice.h> | |
c8cb5b85 TM |
17 | #include <linux/crc32.h> |
18 | #include <linux/bitfield.h> | |
2a519311 JB |
19 | #include <net/arp.h> |
20 | #include <net/cfg80211.h> | |
262eb9b2 | 21 | #include <net/cfg80211-wext.h> |
2a519311 JB |
22 | #include <net/iw_handler.h> |
23 | #include "core.h" | |
24 | #include "nl80211.h" | |
a9a11622 | 25 | #include "wext-compat.h" |
e35e4d28 | 26 | #include "rdev-ops.h" |
2a519311 | 27 | |
776b3580 JB |
28 | /** |
29 | * DOC: BSS tree/list structure | |
30 | * | |
31 | * At the top level, the BSS list is kept in both a list in each | |
32 | * registered device (@bss_list) as well as an RB-tree for faster | |
33 | * lookup. In the RB-tree, entries can be looked up using their | |
34 | * channel, MESHID, MESHCONF (for MBSSes) or channel, BSSID, SSID | |
35 | * for other BSSes. | |
36 | * | |
37 | * Due to the possibility of hidden SSIDs, there's a second level | |
38 | * structure, the "hidden_list" and "hidden_beacon_bss" pointer. | |
39 | * The hidden_list connects all BSSes belonging to a single AP | |
40 | * that has a hidden SSID, and connects beacon and probe response | |
41 | * entries. For a probe response entry for a hidden SSID, the | |
42 | * hidden_beacon_bss pointer points to the BSS struct holding the | |
43 | * beacon's information. | |
44 | * | |
45 | * Reference counting is done for all these references except for | |
46 | * the hidden_list, so that a beacon BSS struct that is otherwise | |
47 | * not referenced has one reference for being on the bss_list and | |
48 | * one for each probe response entry that points to it using the | |
49 | * hidden_beacon_bss pointer. When a BSS struct that has such a | |
50 | * pointer is get/put, the refcount update is also propagated to | |
51 | * the referenced struct, this ensure that it cannot get removed | |
52 | * while somebody is using the probe response version. | |
53 | * | |
54 | * Note that the hidden_beacon_bss pointer never changes, due to | |
55 | * the reference counting. Therefore, no locking is needed for | |
56 | * it. | |
57 | * | |
58 | * Also note that the hidden_beacon_bss pointer is only relevant | |
59 | * if the driver uses something other than the IEs, e.g. private | |
8cf5c86d | 60 | * data stored in the BSS struct, since the beacon IEs are |
776b3580 JB |
61 | * also linked into the probe response struct. |
62 | */ | |
63 | ||
9853a55e JB |
64 | /* |
65 | * Limit the number of BSS entries stored in mac80211. Each one is | |
66 | * a bit over 4k at most, so this limits to roughly 4-5M of memory. | |
67 | * If somebody wants to really attack this though, they'd likely | |
68 | * use small beacons, and only one type of frame, limiting each of | |
69 | * the entries to a much smaller size (in order to generate more | |
70 | * entries in total, so overhead is bigger.) | |
71 | */ | |
72 | static int bss_entries_limit = 1000; | |
73 | module_param(bss_entries_limit, int, 0644); | |
74 | MODULE_PARM_DESC(bss_entries_limit, | |
75 | "limit to number of scan BSS entries (per wiphy, default 1000)"); | |
76 | ||
f9616e0f | 77 | #define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ) |
2a519311 | 78 | |
c8cb5b85 TM |
79 | /** |
80 | * struct cfg80211_colocated_ap - colocated AP information | |
81 | * | |
82 | * @list: linked list to all colocated aPS | |
83 | * @bssid: BSSID of the reported AP | |
84 | * @ssid: SSID of the reported AP | |
85 | * @ssid_len: length of the ssid | |
86 | * @center_freq: frequency the reported AP is on | |
87 | * @unsolicited_probe: the reported AP is part of an ESS, where all the APs | |
88 | * that operate in the same channel as the reported AP and that might be | |
89 | * detected by a STA receiving this frame, are transmitting unsolicited | |
90 | * Probe Response frames every 20 TUs | |
91 | * @oct_recommended: OCT is recommended to exchange MMPDUs with the reported AP | |
92 | * @same_ssid: the reported AP has the same SSID as the reporting AP | |
93 | * @multi_bss: the reported AP is part of a multiple BSSID set | |
94 | * @transmitted_bssid: the reported AP is the transmitting BSSID | |
95 | * @colocated_ess: all the APs that share the same ESS as the reported AP are | |
96 | * colocated and can be discovered via legacy bands. | |
97 | * @short_ssid_valid: short_ssid is valid and can be used | |
98 | * @short_ssid: the short SSID for this SSID | |
99 | */ | |
100 | struct cfg80211_colocated_ap { | |
101 | struct list_head list; | |
102 | u8 bssid[ETH_ALEN]; | |
103 | u8 ssid[IEEE80211_MAX_SSID_LEN]; | |
104 | size_t ssid_len; | |
105 | u32 short_ssid; | |
106 | u32 center_freq; | |
107 | u8 unsolicited_probe:1, | |
108 | oct_recommended:1, | |
109 | same_ssid:1, | |
110 | multi_bss:1, | |
111 | transmitted_bssid:1, | |
112 | colocated_ess:1, | |
113 | short_ssid_valid:1; | |
114 | }; | |
115 | ||
776b3580 | 116 | static void bss_free(struct cfg80211_internal_bss *bss) |
e8e27c66 | 117 | { |
9caf0364 | 118 | struct cfg80211_bss_ies *ies; |
b629ea3d JB |
119 | |
120 | if (WARN_ON(atomic_read(&bss->hold))) | |
121 | return; | |
122 | ||
9caf0364 | 123 | ies = (void *)rcu_access_pointer(bss->pub.beacon_ies); |
776b3580 | 124 | if (ies && !bss->pub.hidden_beacon_bss) |
9caf0364 JB |
125 | kfree_rcu(ies, rcu_head); |
126 | ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies); | |
127 | if (ies) | |
128 | kfree_rcu(ies, rcu_head); | |
e8e27c66 | 129 | |
776b3580 JB |
130 | /* |
131 | * This happens when the module is removed, it doesn't | |
132 | * really matter any more save for completeness | |
133 | */ | |
134 | if (!list_empty(&bss->hidden_list)) | |
135 | list_del(&bss->hidden_list); | |
136 | ||
e8e27c66 AK |
137 | kfree(bss); |
138 | } | |
139 | ||
1b8ec87a | 140 | static inline void bss_ref_get(struct cfg80211_registered_device *rdev, |
776b3580 | 141 | struct cfg80211_internal_bss *bss) |
0532d4f1 | 142 | { |
1b8ec87a | 143 | lockdep_assert_held(&rdev->bss_lock); |
776b3580 JB |
144 | |
145 | bss->refcount++; | |
0b780881 JB |
146 | |
147 | if (bss->pub.hidden_beacon_bss) | |
148 | bss_from_pub(bss->pub.hidden_beacon_bss)->refcount++; | |
149 | ||
150 | if (bss->pub.transmitted_bss) | |
151 | bss_from_pub(bss->pub.transmitted_bss)->refcount++; | |
0532d4f1 JB |
152 | } |
153 | ||
1b8ec87a | 154 | static inline void bss_ref_put(struct cfg80211_registered_device *rdev, |
776b3580 | 155 | struct cfg80211_internal_bss *bss) |
0532d4f1 | 156 | { |
1b8ec87a | 157 | lockdep_assert_held(&rdev->bss_lock); |
776b3580 JB |
158 | |
159 | if (bss->pub.hidden_beacon_bss) { | |
160 | struct cfg80211_internal_bss *hbss; | |
161 | hbss = container_of(bss->pub.hidden_beacon_bss, | |
162 | struct cfg80211_internal_bss, | |
163 | pub); | |
164 | hbss->refcount--; | |
165 | if (hbss->refcount == 0) | |
166 | bss_free(hbss); | |
167 | } | |
a3584f56 | 168 | |
7011ba58 | 169 | if (bss->pub.transmitted_bss) { |
a3584f56 SS |
170 | struct cfg80211_internal_bss *tbss; |
171 | ||
7011ba58 | 172 | tbss = container_of(bss->pub.transmitted_bss, |
a3584f56 SS |
173 | struct cfg80211_internal_bss, |
174 | pub); | |
175 | tbss->refcount--; | |
176 | if (tbss->refcount == 0) | |
177 | bss_free(tbss); | |
178 | } | |
179 | ||
776b3580 JB |
180 | bss->refcount--; |
181 | if (bss->refcount == 0) | |
182 | bss_free(bss); | |
0532d4f1 JB |
183 | } |
184 | ||
1b8ec87a | 185 | static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev, |
e8e27c66 AK |
186 | struct cfg80211_internal_bss *bss) |
187 | { | |
1b8ec87a | 188 | lockdep_assert_held(&rdev->bss_lock); |
4b1af479 | 189 | |
776b3580 JB |
190 | if (!list_empty(&bss->hidden_list)) { |
191 | /* | |
192 | * don't remove the beacon entry if it has | |
193 | * probe responses associated with it | |
194 | */ | |
195 | if (!bss->pub.hidden_beacon_bss) | |
196 | return false; | |
197 | /* | |
198 | * if it's a probe response entry break its | |
199 | * link to the other entries in the group | |
200 | */ | |
201 | list_del_init(&bss->hidden_list); | |
202 | } | |
203 | ||
e8e27c66 | 204 | list_del_init(&bss->list); |
7011ba58 | 205 | list_del_init(&bss->pub.nontrans_list); |
1b8ec87a | 206 | rb_erase(&bss->rbn, &rdev->bss_tree); |
9853a55e JB |
207 | rdev->bss_entries--; |
208 | WARN_ONCE((rdev->bss_entries == 0) ^ list_empty(&rdev->bss_list), | |
209 | "rdev bss entries[%d]/list[empty:%d] corruption\n", | |
210 | rdev->bss_entries, list_empty(&rdev->bss_list)); | |
1b8ec87a | 211 | bss_ref_put(rdev, bss); |
776b3580 | 212 | return true; |
e8e27c66 AK |
213 | } |
214 | ||
f7dacfb1 SS |
215 | bool cfg80211_is_element_inherited(const struct element *elem, |
216 | const struct element *non_inherit_elem) | |
217 | { | |
218 | u8 id_len, ext_id_len, i, loop_len, id; | |
219 | const u8 *list; | |
220 | ||
221 | if (elem->id == WLAN_EID_MULTIPLE_BSSID) | |
222 | return false; | |
223 | ||
224 | if (!non_inherit_elem || non_inherit_elem->datalen < 2) | |
225 | return true; | |
226 | ||
227 | /* | |
228 | * non inheritance element format is: | |
229 | * ext ID (56) | IDs list len | list | extension IDs list len | list | |
230 | * Both lists are optional. Both lengths are mandatory. | |
231 | * This means valid length is: | |
232 | * elem_len = 1 (extension ID) + 2 (list len fields) + list lengths | |
233 | */ | |
234 | id_len = non_inherit_elem->data[1]; | |
235 | if (non_inherit_elem->datalen < 3 + id_len) | |
236 | return true; | |
237 | ||
238 | ext_id_len = non_inherit_elem->data[2 + id_len]; | |
239 | if (non_inherit_elem->datalen < 3 + id_len + ext_id_len) | |
240 | return true; | |
241 | ||
242 | if (elem->id == WLAN_EID_EXTENSION) { | |
243 | if (!ext_id_len) | |
244 | return true; | |
245 | loop_len = ext_id_len; | |
246 | list = &non_inherit_elem->data[3 + id_len]; | |
247 | id = elem->data[0]; | |
248 | } else { | |
249 | if (!id_len) | |
250 | return true; | |
251 | loop_len = id_len; | |
252 | list = &non_inherit_elem->data[2]; | |
253 | id = elem->id; | |
254 | } | |
255 | ||
256 | for (i = 0; i < loop_len; i++) { | |
257 | if (list[i] == id) | |
258 | return false; | |
259 | } | |
260 | ||
261 | return true; | |
262 | } | |
263 | EXPORT_SYMBOL(cfg80211_is_element_inherited); | |
264 | ||
0b8fb823 PX |
265 | static size_t cfg80211_gen_new_ie(const u8 *ie, size_t ielen, |
266 | const u8 *subelement, size_t subie_len, | |
267 | u8 *new_ie, gfp_t gfp) | |
268 | { | |
269 | u8 *pos, *tmp; | |
270 | const u8 *tmp_old, *tmp_new; | |
f7dacfb1 | 271 | const struct element *non_inherit_elem; |
0b8fb823 PX |
272 | u8 *sub_copy; |
273 | ||
274 | /* copy subelement as we need to change its content to | |
275 | * mark an ie after it is processed. | |
276 | */ | |
90abf96a | 277 | sub_copy = kmemdup(subelement, subie_len, gfp); |
0b8fb823 PX |
278 | if (!sub_copy) |
279 | return 0; | |
0b8fb823 PX |
280 | |
281 | pos = &new_ie[0]; | |
282 | ||
283 | /* set new ssid */ | |
284 | tmp_new = cfg80211_find_ie(WLAN_EID_SSID, sub_copy, subie_len); | |
285 | if (tmp_new) { | |
286 | memcpy(pos, tmp_new, tmp_new[1] + 2); | |
287 | pos += (tmp_new[1] + 2); | |
288 | } | |
289 | ||
f7dacfb1 SS |
290 | /* get non inheritance list if exists */ |
291 | non_inherit_elem = | |
292 | cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE, | |
293 | sub_copy, subie_len); | |
294 | ||
0b8fb823 PX |
295 | /* go through IEs in ie (skip SSID) and subelement, |
296 | * merge them into new_ie | |
297 | */ | |
298 | tmp_old = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen); | |
299 | tmp_old = (tmp_old) ? tmp_old + tmp_old[1] + 2 : ie; | |
300 | ||
567e14e3 JB |
301 | while (tmp_old + 2 - ie <= ielen && |
302 | tmp_old + tmp_old[1] + 2 - ie <= ielen) { | |
0b8fb823 PX |
303 | if (tmp_old[0] == 0) { |
304 | tmp_old++; | |
305 | continue; | |
306 | } | |
307 | ||
c17fe043 SS |
308 | if (tmp_old[0] == WLAN_EID_EXTENSION) |
309 | tmp = (u8 *)cfg80211_find_ext_ie(tmp_old[2], sub_copy, | |
310 | subie_len); | |
311 | else | |
312 | tmp = (u8 *)cfg80211_find_ie(tmp_old[0], sub_copy, | |
313 | subie_len); | |
314 | ||
0b8fb823 | 315 | if (!tmp) { |
f7dacfb1 SS |
316 | const struct element *old_elem = (void *)tmp_old; |
317 | ||
0b8fb823 | 318 | /* ie in old ie but not in subelement */ |
f7dacfb1 SS |
319 | if (cfg80211_is_element_inherited(old_elem, |
320 | non_inherit_elem)) { | |
0b8fb823 PX |
321 | memcpy(pos, tmp_old, tmp_old[1] + 2); |
322 | pos += tmp_old[1] + 2; | |
323 | } | |
324 | } else { | |
325 | /* ie in transmitting ie also in subelement, | |
326 | * copy from subelement and flag the ie in subelement | |
c17fe043 SS |
327 | * as copied (by setting eid field to WLAN_EID_SSID, |
328 | * which is skipped anyway). | |
329 | * For vendor ie, compare OUI + type + subType to | |
0b8fb823 PX |
330 | * determine if they are the same ie. |
331 | */ | |
332 | if (tmp_old[0] == WLAN_EID_VENDOR_SPECIFIC) { | |
9f16b5c8 JB |
333 | if (tmp_old[1] >= 5 && tmp[1] >= 5 && |
334 | !memcmp(tmp_old + 2, tmp + 2, 5)) { | |
0b8fb823 PX |
335 | /* same vendor ie, copy from |
336 | * subelement | |
337 | */ | |
338 | memcpy(pos, tmp, tmp[1] + 2); | |
339 | pos += tmp[1] + 2; | |
c17fe043 | 340 | tmp[0] = WLAN_EID_SSID; |
0b8fb823 PX |
341 | } else { |
342 | memcpy(pos, tmp_old, tmp_old[1] + 2); | |
343 | pos += tmp_old[1] + 2; | |
344 | } | |
345 | } else { | |
346 | /* copy ie from subelement into new ie */ | |
347 | memcpy(pos, tmp, tmp[1] + 2); | |
348 | pos += tmp[1] + 2; | |
c17fe043 | 349 | tmp[0] = WLAN_EID_SSID; |
0b8fb823 PX |
350 | } |
351 | } | |
352 | ||
353 | if (tmp_old + tmp_old[1] + 2 - ie == ielen) | |
354 | break; | |
355 | ||
356 | tmp_old += tmp_old[1] + 2; | |
357 | } | |
358 | ||
359 | /* go through subelement again to check if there is any ie not | |
360 | * copied to new ie, skip ssid, capability, bssid-index ie | |
361 | */ | |
362 | tmp_new = sub_copy; | |
567e14e3 JB |
363 | while (tmp_new + 2 - sub_copy <= subie_len && |
364 | tmp_new + tmp_new[1] + 2 - sub_copy <= subie_len) { | |
0b8fb823 | 365 | if (!(tmp_new[0] == WLAN_EID_NON_TX_BSSID_CAP || |
5bd9d108 | 366 | tmp_new[0] == WLAN_EID_SSID)) { |
0b8fb823 PX |
367 | memcpy(pos, tmp_new, tmp_new[1] + 2); |
368 | pos += tmp_new[1] + 2; | |
369 | } | |
370 | if (tmp_new + tmp_new[1] + 2 - sub_copy == subie_len) | |
371 | break; | |
372 | tmp_new += tmp_new[1] + 2; | |
373 | } | |
374 | ||
375 | kfree(sub_copy); | |
376 | return pos - new_ie; | |
377 | } | |
378 | ||
379 | static bool is_bss(struct cfg80211_bss *a, const u8 *bssid, | |
380 | const u8 *ssid, size_t ssid_len) | |
381 | { | |
382 | const struct cfg80211_bss_ies *ies; | |
a3eca817 | 383 | const struct element *ssid_elem; |
0b8fb823 PX |
384 | |
385 | if (bssid && !ether_addr_equal(a->bssid, bssid)) | |
386 | return false; | |
387 | ||
388 | if (!ssid) | |
389 | return true; | |
390 | ||
391 | ies = rcu_access_pointer(a->ies); | |
392 | if (!ies) | |
393 | return false; | |
a3eca817 JB |
394 | ssid_elem = cfg80211_find_elem(WLAN_EID_SSID, ies->data, ies->len); |
395 | if (!ssid_elem) | |
0b8fb823 | 396 | return false; |
a3eca817 | 397 | if (ssid_elem->datalen != ssid_len) |
0b8fb823 | 398 | return false; |
a3eca817 | 399 | return memcmp(ssid_elem->data, ssid, ssid_len) == 0; |
0b8fb823 PX |
400 | } |
401 | ||
402 | static int | |
7011ba58 SS |
403 | cfg80211_add_nontrans_list(struct cfg80211_bss *trans_bss, |
404 | struct cfg80211_bss *nontrans_bss) | |
0b8fb823 | 405 | { |
fb8b53ac | 406 | const struct element *ssid_elem; |
7011ba58 | 407 | struct cfg80211_bss *bss = NULL; |
0b8fb823 PX |
408 | |
409 | rcu_read_lock(); | |
fb8b53ac JB |
410 | ssid_elem = ieee80211_bss_get_elem(nontrans_bss, WLAN_EID_SSID); |
411 | if (!ssid_elem) { | |
0b8fb823 PX |
412 | rcu_read_unlock(); |
413 | return -EINVAL; | |
414 | } | |
0b8fb823 PX |
415 | |
416 | /* check if nontrans_bss is in the list */ | |
417 | list_for_each_entry(bss, &trans_bss->nontrans_list, nontrans_list) { | |
fb8b53ac JB |
418 | if (is_bss(bss, nontrans_bss->bssid, ssid_elem->data, |
419 | ssid_elem->datalen)) { | |
a2083eeb | 420 | rcu_read_unlock(); |
0b8fb823 | 421 | return 0; |
a2083eeb | 422 | } |
0b8fb823 PX |
423 | } |
424 | ||
a2083eeb JB |
425 | rcu_read_unlock(); |
426 | ||
bcca8520 JB |
427 | /* |
428 | * This is a bit weird - it's not on the list, but already on another | |
429 | * one! The only way that could happen is if there's some BSSID/SSID | |
430 | * shared by multiple APs in their multi-BSSID profiles, potentially | |
431 | * with hidden SSID mixed in ... ignore it. | |
432 | */ | |
433 | if (!list_empty(&nontrans_bss->nontrans_list)) | |
434 | return -EINVAL; | |
435 | ||
0b8fb823 PX |
436 | /* add to the list */ |
437 | list_add_tail(&nontrans_bss->nontrans_list, &trans_bss->nontrans_list); | |
438 | return 0; | |
439 | } | |
440 | ||
1b8ec87a | 441 | static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev, |
15d6030b SL |
442 | unsigned long expire_time) |
443 | { | |
444 | struct cfg80211_internal_bss *bss, *tmp; | |
445 | bool expired = false; | |
446 | ||
1b8ec87a | 447 | lockdep_assert_held(&rdev->bss_lock); |
4b1af479 | 448 | |
1b8ec87a | 449 | list_for_each_entry_safe(bss, tmp, &rdev->bss_list, list) { |
15d6030b SL |
450 | if (atomic_read(&bss->hold)) |
451 | continue; | |
452 | if (!time_after(expire_time, bss->ts)) | |
453 | continue; | |
454 | ||
1b8ec87a | 455 | if (__cfg80211_unlink_bss(rdev, bss)) |
776b3580 | 456 | expired = true; |
15d6030b SL |
457 | } |
458 | ||
459 | if (expired) | |
1b8ec87a | 460 | rdev->bss_generation++; |
15d6030b SL |
461 | } |
462 | ||
9853a55e JB |
463 | static bool cfg80211_bss_expire_oldest(struct cfg80211_registered_device *rdev) |
464 | { | |
465 | struct cfg80211_internal_bss *bss, *oldest = NULL; | |
466 | bool ret; | |
467 | ||
468 | lockdep_assert_held(&rdev->bss_lock); | |
469 | ||
470 | list_for_each_entry(bss, &rdev->bss_list, list) { | |
471 | if (atomic_read(&bss->hold)) | |
472 | continue; | |
473 | ||
474 | if (!list_empty(&bss->hidden_list) && | |
475 | !bss->pub.hidden_beacon_bss) | |
476 | continue; | |
477 | ||
478 | if (oldest && time_before(oldest->ts, bss->ts)) | |
479 | continue; | |
480 | oldest = bss; | |
481 | } | |
482 | ||
483 | if (WARN_ON(!oldest)) | |
484 | return false; | |
485 | ||
486 | /* | |
487 | * The callers make sure to increase rdev->bss_generation if anything | |
488 | * gets removed (and a new entry added), so there's no need to also do | |
489 | * it here. | |
490 | */ | |
491 | ||
492 | ret = __cfg80211_unlink_bss(rdev, oldest); | |
493 | WARN_ON(!ret); | |
494 | return ret; | |
495 | } | |
496 | ||
c8cb5b85 TM |
497 | static u8 cfg80211_parse_bss_param(u8 data, |
498 | struct cfg80211_colocated_ap *coloc_ap) | |
499 | { | |
500 | coloc_ap->oct_recommended = | |
501 | u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_OCT_RECOMMENDED); | |
502 | coloc_ap->same_ssid = | |
503 | u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_SAME_SSID); | |
504 | coloc_ap->multi_bss = | |
505 | u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_MULTI_BSSID); | |
506 | coloc_ap->transmitted_bssid = | |
507 | u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_TRANSMITTED_BSSID); | |
508 | coloc_ap->unsolicited_probe = | |
509 | u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_PROBE_ACTIVE); | |
510 | coloc_ap->colocated_ess = | |
511 | u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_COLOC_ESS); | |
512 | ||
513 | return u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_COLOC_AP); | |
514 | } | |
515 | ||
516 | static int cfg80211_calc_short_ssid(const struct cfg80211_bss_ies *ies, | |
517 | const struct element **elem, u32 *s_ssid) | |
518 | { | |
519 | ||
520 | *elem = cfg80211_find_elem(WLAN_EID_SSID, ies->data, ies->len); | |
521 | if (!*elem || (*elem)->datalen > IEEE80211_MAX_SSID_LEN) | |
522 | return -EINVAL; | |
523 | ||
524 | *s_ssid = ~crc32_le(~0, (*elem)->data, (*elem)->datalen); | |
525 | return 0; | |
526 | } | |
527 | ||
528 | static void cfg80211_free_coloc_ap_list(struct list_head *coloc_ap_list) | |
529 | { | |
530 | struct cfg80211_colocated_ap *ap, *tmp_ap; | |
531 | ||
532 | list_for_each_entry_safe(ap, tmp_ap, coloc_ap_list, list) { | |
533 | list_del(&ap->list); | |
534 | kfree(ap); | |
535 | } | |
536 | } | |
537 | ||
538 | static int cfg80211_parse_ap_info(struct cfg80211_colocated_ap *entry, | |
539 | const u8 *pos, u8 length, | |
540 | const struct element *ssid_elem, | |
541 | int s_ssid_tmp) | |
542 | { | |
543 | /* skip the TBTT offset */ | |
544 | pos++; | |
545 | ||
546 | memcpy(entry->bssid, pos, ETH_ALEN); | |
547 | pos += ETH_ALEN; | |
548 | ||
dd1671ed | 549 | if (length >= IEEE80211_TBTT_INFO_OFFSET_BSSID_SSSID_BSS_PARAM) { |
c8cb5b85 TM |
550 | memcpy(&entry->short_ssid, pos, |
551 | sizeof(entry->short_ssid)); | |
552 | entry->short_ssid_valid = true; | |
553 | pos += 4; | |
554 | } | |
555 | ||
556 | /* skip non colocated APs */ | |
557 | if (!cfg80211_parse_bss_param(*pos, entry)) | |
558 | return -EINVAL; | |
559 | pos++; | |
560 | ||
561 | if (length == IEEE80211_TBTT_INFO_OFFSET_BSSID_BSS_PARAM) { | |
562 | /* | |
563 | * no information about the short ssid. Consider the entry valid | |
564 | * for now. It would later be dropped in case there are explicit | |
565 | * SSIDs that need to be matched | |
566 | */ | |
567 | if (!entry->same_ssid) | |
568 | return 0; | |
569 | } | |
570 | ||
571 | if (entry->same_ssid) { | |
572 | entry->short_ssid = s_ssid_tmp; | |
573 | entry->short_ssid_valid = true; | |
574 | ||
575 | /* | |
576 | * This is safe because we validate datalen in | |
577 | * cfg80211_parse_colocated_ap(), before calling this | |
578 | * function. | |
579 | */ | |
580 | memcpy(&entry->ssid, &ssid_elem->data, | |
581 | ssid_elem->datalen); | |
582 | entry->ssid_len = ssid_elem->datalen; | |
583 | } | |
584 | return 0; | |
585 | } | |
586 | ||
587 | static int cfg80211_parse_colocated_ap(const struct cfg80211_bss_ies *ies, | |
588 | struct list_head *list) | |
589 | { | |
590 | struct ieee80211_neighbor_ap_info *ap_info; | |
591 | const struct element *elem, *ssid_elem; | |
592 | const u8 *pos, *end; | |
593 | u32 s_ssid_tmp; | |
594 | int n_coloc = 0, ret; | |
595 | LIST_HEAD(ap_list); | |
596 | ||
597 | elem = cfg80211_find_elem(WLAN_EID_REDUCED_NEIGHBOR_REPORT, ies->data, | |
598 | ies->len); | |
8a16ffdc | 599 | if (!elem) |
c8cb5b85 TM |
600 | return 0; |
601 | ||
602 | pos = elem->data; | |
603 | end = pos + elem->datalen; | |
604 | ||
605 | ret = cfg80211_calc_short_ssid(ies, &ssid_elem, &s_ssid_tmp); | |
606 | if (ret) | |
607 | return ret; | |
608 | ||
609 | /* RNR IE may contain more than one NEIGHBOR_AP_INFO */ | |
610 | while (pos + sizeof(*ap_info) <= end) { | |
611 | enum nl80211_band band; | |
612 | int freq; | |
613 | u8 length, i, count; | |
614 | ||
615 | ap_info = (void *)pos; | |
616 | count = u8_get_bits(ap_info->tbtt_info_hdr, | |
617 | IEEE80211_AP_INFO_TBTT_HDR_COUNT) + 1; | |
618 | length = ap_info->tbtt_info_len; | |
619 | ||
620 | pos += sizeof(*ap_info); | |
621 | ||
622 | if (!ieee80211_operating_class_to_band(ap_info->op_class, | |
623 | &band)) | |
624 | break; | |
625 | ||
626 | freq = ieee80211_channel_to_frequency(ap_info->channel, band); | |
627 | ||
5b5c9f3b | 628 | if (end - pos < count * length) |
c8cb5b85 TM |
629 | break; |
630 | ||
631 | /* | |
632 | * TBTT info must include bss param + BSSID + | |
633 | * (short SSID or same_ssid bit to be set). | |
634 | * ignore other options, and move to the | |
635 | * next AP info | |
636 | */ | |
637 | if (band != NL80211_BAND_6GHZ || | |
638 | (length != IEEE80211_TBTT_INFO_OFFSET_BSSID_BSS_PARAM && | |
639 | length < IEEE80211_TBTT_INFO_OFFSET_BSSID_SSSID_BSS_PARAM)) { | |
5b5c9f3b | 640 | pos += count * length; |
c8cb5b85 TM |
641 | continue; |
642 | } | |
643 | ||
644 | for (i = 0; i < count; i++) { | |
645 | struct cfg80211_colocated_ap *entry; | |
646 | ||
647 | entry = kzalloc(sizeof(*entry) + IEEE80211_MAX_SSID_LEN, | |
648 | GFP_ATOMIC); | |
649 | ||
650 | if (!entry) | |
651 | break; | |
652 | ||
653 | entry->center_freq = freq; | |
654 | ||
655 | if (!cfg80211_parse_ap_info(entry, pos, length, | |
656 | ssid_elem, s_ssid_tmp)) { | |
657 | n_coloc++; | |
658 | list_add_tail(&entry->list, &ap_list); | |
659 | } else { | |
660 | kfree(entry); | |
661 | } | |
662 | ||
5b5c9f3b | 663 | pos += length; |
c8cb5b85 TM |
664 | } |
665 | } | |
666 | ||
667 | if (pos != end) { | |
668 | cfg80211_free_coloc_ap_list(&ap_list); | |
669 | return 0; | |
670 | } | |
671 | ||
672 | list_splice_tail(&ap_list, list); | |
673 | return n_coloc; | |
674 | } | |
675 | ||
676 | static void cfg80211_scan_req_add_chan(struct cfg80211_scan_request *request, | |
677 | struct ieee80211_channel *chan, | |
678 | bool add_to_6ghz) | |
679 | { | |
680 | int i; | |
681 | u32 n_channels = request->n_channels; | |
682 | struct cfg80211_scan_6ghz_params *params = | |
683 | &request->scan_6ghz_params[request->n_6ghz_params]; | |
684 | ||
685 | for (i = 0; i < n_channels; i++) { | |
686 | if (request->channels[i] == chan) { | |
687 | if (add_to_6ghz) | |
688 | params->channel_idx = i; | |
689 | return; | |
690 | } | |
691 | } | |
692 | ||
693 | request->channels[n_channels] = chan; | |
694 | if (add_to_6ghz) | |
695 | request->scan_6ghz_params[request->n_6ghz_params].channel_idx = | |
696 | n_channels; | |
697 | ||
698 | request->n_channels++; | |
699 | } | |
700 | ||
701 | static bool cfg80211_find_ssid_match(struct cfg80211_colocated_ap *ap, | |
702 | struct cfg80211_scan_request *request) | |
703 | { | |
ba5c2523 | 704 | int i; |
c8cb5b85 TM |
705 | u32 s_ssid; |
706 | ||
707 | for (i = 0; i < request->n_ssids; i++) { | |
708 | /* wildcard ssid in the scan request */ | |
5666ee15 AS |
709 | if (!request->ssids[i].ssid_len) { |
710 | if (ap->multi_bss && !ap->transmitted_bssid) | |
711 | continue; | |
712 | ||
c8cb5b85 | 713 | return true; |
5666ee15 | 714 | } |
c8cb5b85 TM |
715 | |
716 | if (ap->ssid_len && | |
717 | ap->ssid_len == request->ssids[i].ssid_len) { | |
718 | if (!memcmp(request->ssids[i].ssid, ap->ssid, | |
719 | ap->ssid_len)) | |
720 | return true; | |
721 | } else if (ap->short_ssid_valid) { | |
722 | s_ssid = ~crc32_le(~0, request->ssids[i].ssid, | |
723 | request->ssids[i].ssid_len); | |
724 | ||
725 | if (ap->short_ssid == s_ssid) | |
726 | return true; | |
727 | } | |
728 | } | |
729 | ||
730 | return false; | |
731 | } | |
732 | ||
733 | static int cfg80211_scan_6ghz(struct cfg80211_registered_device *rdev) | |
734 | { | |
735 | u8 i; | |
736 | struct cfg80211_colocated_ap *ap; | |
737 | int n_channels, count = 0, err; | |
738 | struct cfg80211_scan_request *request, *rdev_req = rdev->scan_req; | |
739 | LIST_HEAD(coloc_ap_list); | |
d590a125 | 740 | bool need_scan_psc = true; |
c8cb5b85 TM |
741 | const struct ieee80211_sband_iftype_data *iftd; |
742 | ||
743 | rdev_req->scan_6ghz = true; | |
744 | ||
745 | if (!rdev->wiphy.bands[NL80211_BAND_6GHZ]) | |
746 | return -EOPNOTSUPP; | |
747 | ||
748 | iftd = ieee80211_get_sband_iftype_data(rdev->wiphy.bands[NL80211_BAND_6GHZ], | |
749 | rdev_req->wdev->iftype); | |
750 | if (!iftd || !iftd->he_cap.has_he) | |
751 | return -EOPNOTSUPP; | |
752 | ||
753 | n_channels = rdev->wiphy.bands[NL80211_BAND_6GHZ]->n_channels; | |
754 | ||
755 | if (rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ) { | |
756 | struct cfg80211_internal_bss *intbss; | |
757 | ||
758 | spin_lock_bh(&rdev->bss_lock); | |
759 | list_for_each_entry(intbss, &rdev->bss_list, list) { | |
760 | struct cfg80211_bss *res = &intbss->pub; | |
761 | const struct cfg80211_bss_ies *ies; | |
762 | ||
763 | ies = rcu_access_pointer(res->ies); | |
764 | count += cfg80211_parse_colocated_ap(ies, | |
765 | &coloc_ap_list); | |
766 | } | |
767 | spin_unlock_bh(&rdev->bss_lock); | |
768 | } | |
769 | ||
770 | request = kzalloc(struct_size(request, channels, n_channels) + | |
52bb2052 IP |
771 | sizeof(*request->scan_6ghz_params) * count + |
772 | sizeof(*request->ssids) * rdev_req->n_ssids, | |
c8cb5b85 TM |
773 | GFP_KERNEL); |
774 | if (!request) { | |
775 | cfg80211_free_coloc_ap_list(&coloc_ap_list); | |
776 | return -ENOMEM; | |
777 | } | |
778 | ||
779 | *request = *rdev_req; | |
780 | request->n_channels = 0; | |
781 | request->scan_6ghz_params = | |
782 | (void *)&request->channels[n_channels]; | |
783 | ||
784 | /* | |
d590a125 AB |
785 | * PSC channels should not be scanned in case of direct scan with 1 SSID |
786 | * and at least one of the reported co-located APs with same SSID | |
787 | * indicating that all APs in the same ESS are co-located | |
c8cb5b85 | 788 | */ |
d590a125 | 789 | if (count && request->n_ssids == 1 && request->ssids[0].ssid_len) { |
c8cb5b85 | 790 | list_for_each_entry(ap, &coloc_ap_list, list) { |
d590a125 AB |
791 | if (ap->colocated_ess && |
792 | cfg80211_find_ssid_match(ap, request)) { | |
793 | need_scan_psc = false; | |
c8cb5b85 TM |
794 | break; |
795 | } | |
796 | } | |
c8cb5b85 TM |
797 | } |
798 | ||
799 | /* | |
800 | * add to the scan request the channels that need to be scanned | |
801 | * regardless of the collocated APs (PSC channels or all channels | |
802 | * in case that NL80211_SCAN_FLAG_COLOCATED_6GHZ is not set) | |
803 | */ | |
804 | for (i = 0; i < rdev_req->n_channels; i++) { | |
805 | if (rdev_req->channels[i]->band == NL80211_BAND_6GHZ && | |
806 | ((need_scan_psc && | |
807 | cfg80211_channel_is_psc(rdev_req->channels[i])) || | |
808 | !(rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ))) { | |
809 | cfg80211_scan_req_add_chan(request, | |
810 | rdev_req->channels[i], | |
811 | false); | |
812 | } | |
813 | } | |
814 | ||
815 | if (!(rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ)) | |
816 | goto skip; | |
817 | ||
818 | list_for_each_entry(ap, &coloc_ap_list, list) { | |
819 | bool found = false; | |
820 | struct cfg80211_scan_6ghz_params *scan_6ghz_params = | |
821 | &request->scan_6ghz_params[request->n_6ghz_params]; | |
822 | struct ieee80211_channel *chan = | |
823 | ieee80211_get_channel(&rdev->wiphy, ap->center_freq); | |
824 | ||
825 | if (!chan || chan->flags & IEEE80211_CHAN_DISABLED) | |
826 | continue; | |
827 | ||
828 | for (i = 0; i < rdev_req->n_channels; i++) { | |
829 | if (rdev_req->channels[i] == chan) | |
830 | found = true; | |
831 | } | |
832 | ||
833 | if (!found) | |
834 | continue; | |
835 | ||
836 | if (request->n_ssids > 0 && | |
837 | !cfg80211_find_ssid_match(ap, request)) | |
838 | continue; | |
839 | ||
5666ee15 AS |
840 | if (!request->n_ssids && ap->multi_bss && !ap->transmitted_bssid) |
841 | continue; | |
842 | ||
c8cb5b85 TM |
843 | cfg80211_scan_req_add_chan(request, chan, true); |
844 | memcpy(scan_6ghz_params->bssid, ap->bssid, ETH_ALEN); | |
845 | scan_6ghz_params->short_ssid = ap->short_ssid; | |
846 | scan_6ghz_params->short_ssid_valid = ap->short_ssid_valid; | |
847 | scan_6ghz_params->unsolicited_probe = ap->unsolicited_probe; | |
848 | ||
849 | /* | |
850 | * If a PSC channel is added to the scan and 'need_scan_psc' is | |
851 | * set to false, then all the APs that the scan logic is | |
852 | * interested with on the channel are collocated and thus there | |
853 | * is no need to perform the initial PSC channel listen. | |
854 | */ | |
855 | if (cfg80211_channel_is_psc(chan) && !need_scan_psc) | |
856 | scan_6ghz_params->psc_no_listen = true; | |
857 | ||
858 | request->n_6ghz_params++; | |
859 | } | |
860 | ||
861 | skip: | |
862 | cfg80211_free_coloc_ap_list(&coloc_ap_list); | |
863 | ||
864 | if (request->n_channels) { | |
865 | struct cfg80211_scan_request *old = rdev->int_scan_req; | |
c8cb5b85 TM |
866 | rdev->int_scan_req = request; |
867 | ||
52bb2052 IP |
868 | /* |
869 | * Add the ssids from the parent scan request to the new scan | |
870 | * request, so the driver would be able to use them in its | |
871 | * probe requests to discover hidden APs on PSC channels. | |
872 | */ | |
873 | request->ssids = (void *)&request->channels[request->n_channels]; | |
874 | request->n_ssids = rdev_req->n_ssids; | |
875 | memcpy(request->ssids, rdev_req->ssids, sizeof(*request->ssids) * | |
876 | request->n_ssids); | |
877 | ||
c8cb5b85 TM |
878 | /* |
879 | * If this scan follows a previous scan, save the scan start | |
880 | * info from the first part of the scan | |
881 | */ | |
882 | if (old) | |
883 | rdev->int_scan_req->info = old->info; | |
884 | ||
885 | err = rdev_scan(rdev, request); | |
886 | if (err) { | |
887 | rdev->int_scan_req = old; | |
888 | kfree(request); | |
889 | } else { | |
890 | kfree(old); | |
891 | } | |
892 | ||
893 | return err; | |
894 | } | |
895 | ||
896 | kfree(request); | |
897 | return -EINVAL; | |
898 | } | |
899 | ||
900 | int cfg80211_scan(struct cfg80211_registered_device *rdev) | |
901 | { | |
902 | struct cfg80211_scan_request *request; | |
903 | struct cfg80211_scan_request *rdev_req = rdev->scan_req; | |
904 | u32 n_channels = 0, idx, i; | |
905 | ||
906 | if (!(rdev->wiphy.flags & WIPHY_FLAG_SPLIT_SCAN_6GHZ)) | |
907 | return rdev_scan(rdev, rdev_req); | |
908 | ||
909 | for (i = 0; i < rdev_req->n_channels; i++) { | |
910 | if (rdev_req->channels[i]->band != NL80211_BAND_6GHZ) | |
911 | n_channels++; | |
912 | } | |
913 | ||
914 | if (!n_channels) | |
915 | return cfg80211_scan_6ghz(rdev); | |
916 | ||
917 | request = kzalloc(struct_size(request, channels, n_channels), | |
918 | GFP_KERNEL); | |
919 | if (!request) | |
920 | return -ENOMEM; | |
921 | ||
922 | *request = *rdev_req; | |
923 | request->n_channels = n_channels; | |
924 | ||
925 | for (i = idx = 0; i < rdev_req->n_channels; i++) { | |
926 | if (rdev_req->channels[i]->band != NL80211_BAND_6GHZ) | |
927 | request->channels[idx++] = rdev_req->channels[i]; | |
928 | } | |
929 | ||
930 | rdev_req->scan_6ghz = false; | |
931 | rdev->int_scan_req = request; | |
932 | return rdev_scan(rdev, request); | |
933 | } | |
934 | ||
f9d15d16 JB |
935 | void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, |
936 | bool send_message) | |
2a519311 | 937 | { |
c8cb5b85 | 938 | struct cfg80211_scan_request *request, *rdev_req; |
fd014284 | 939 | struct wireless_dev *wdev; |
f9d15d16 | 940 | struct sk_buff *msg; |
3d23e349 | 941 | #ifdef CONFIG_CFG80211_WEXT |
2a519311 JB |
942 | union iwreq_data wrqu; |
943 | #endif | |
944 | ||
a05829a7 | 945 | lockdep_assert_held(&rdev->wiphy.mtx); |
01a0ac41 | 946 | |
f9d15d16 | 947 | if (rdev->scan_msg) { |
505a2e88 | 948 | nl80211_send_scan_msg(rdev, rdev->scan_msg); |
f9d15d16 JB |
949 | rdev->scan_msg = NULL; |
950 | return; | |
951 | } | |
667503dd | 952 | |
c8cb5b85 TM |
953 | rdev_req = rdev->scan_req; |
954 | if (!rdev_req) | |
01a0ac41 JB |
955 | return; |
956 | ||
c8cb5b85 TM |
957 | wdev = rdev_req->wdev; |
958 | request = rdev->int_scan_req ? rdev->int_scan_req : rdev_req; | |
959 | ||
960 | if (wdev_running(wdev) && | |
961 | (rdev->wiphy.flags & WIPHY_FLAG_SPLIT_SCAN_6GHZ) && | |
962 | !rdev_req->scan_6ghz && !request->info.aborted && | |
963 | !cfg80211_scan_6ghz(rdev)) | |
964 | return; | |
2a519311 | 965 | |
6829c878 JB |
966 | /* |
967 | * This must be before sending the other events! | |
968 | * Otherwise, wpa_supplicant gets completely confused with | |
969 | * wext events. | |
970 | */ | |
fd014284 JB |
971 | if (wdev->netdev) |
972 | cfg80211_sme_scan_done(wdev->netdev); | |
6829c878 | 973 | |
1d76250b | 974 | if (!request->info.aborted && |
f9d15d16 JB |
975 | request->flags & NL80211_SCAN_FLAG_FLUSH) { |
976 | /* flush entries from previous scans */ | |
977 | spin_lock_bh(&rdev->bss_lock); | |
978 | __cfg80211_bss_expire(rdev, request->scan_start); | |
979 | spin_unlock_bh(&rdev->bss_lock); | |
15d6030b | 980 | } |
2a519311 | 981 | |
1d76250b | 982 | msg = nl80211_build_scan_msg(rdev, wdev, request->info.aborted); |
f9d15d16 | 983 | |
3d23e349 | 984 | #ifdef CONFIG_CFG80211_WEXT |
1d76250b | 985 | if (wdev->netdev && !request->info.aborted) { |
2a519311 JB |
986 | memset(&wrqu, 0, sizeof(wrqu)); |
987 | ||
fd014284 | 988 | wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL); |
2a519311 JB |
989 | } |
990 | #endif | |
991 | ||
1160dfa1 | 992 | dev_put(wdev->netdev); |
2a519311 | 993 | |
c8cb5b85 TM |
994 | kfree(rdev->int_scan_req); |
995 | rdev->int_scan_req = NULL; | |
996 | ||
997 | kfree(rdev->scan_req); | |
36e6fea8 | 998 | rdev->scan_req = NULL; |
f9d15d16 JB |
999 | |
1000 | if (!send_message) | |
1001 | rdev->scan_msg = msg; | |
1002 | else | |
505a2e88 | 1003 | nl80211_send_scan_msg(rdev, msg); |
2a519311 | 1004 | } |
667503dd | 1005 | |
36e6fea8 JB |
1006 | void __cfg80211_scan_done(struct work_struct *wk) |
1007 | { | |
1008 | struct cfg80211_registered_device *rdev; | |
1009 | ||
1010 | rdev = container_of(wk, struct cfg80211_registered_device, | |
1011 | scan_done_wk); | |
1012 | ||
a05829a7 | 1013 | wiphy_lock(&rdev->wiphy); |
f9d15d16 | 1014 | ___cfg80211_scan_done(rdev, true); |
a05829a7 | 1015 | wiphy_unlock(&rdev->wiphy); |
36e6fea8 JB |
1016 | } |
1017 | ||
1d76250b AS |
1018 | void cfg80211_scan_done(struct cfg80211_scan_request *request, |
1019 | struct cfg80211_scan_info *info) | |
667503dd | 1020 | { |
c8cb5b85 TM |
1021 | struct cfg80211_scan_info old_info = request->info; |
1022 | ||
1d76250b | 1023 | trace_cfg80211_scan_done(request, info); |
c8cb5b85 TM |
1024 | WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req && |
1025 | request != wiphy_to_rdev(request->wiphy)->int_scan_req); | |
667503dd | 1026 | |
1d76250b | 1027 | request->info = *info; |
c8cb5b85 TM |
1028 | |
1029 | /* | |
1030 | * In case the scan is split, the scan_start_tsf and tsf_bssid should | |
1031 | * be of the first part. In such a case old_info.scan_start_tsf should | |
1032 | * be non zero. | |
1033 | */ | |
1034 | if (request->scan_6ghz && old_info.scan_start_tsf) { | |
1035 | request->info.scan_start_tsf = old_info.scan_start_tsf; | |
1036 | memcpy(request->info.tsf_bssid, old_info.tsf_bssid, | |
1037 | sizeof(request->info.tsf_bssid)); | |
1038 | } | |
1039 | ||
5fe231e8 | 1040 | request->notified = true; |
f26cbf40 | 1041 | queue_work(cfg80211_wq, &wiphy_to_rdev(request->wiphy)->scan_done_wk); |
667503dd | 1042 | } |
2a519311 JB |
1043 | EXPORT_SYMBOL(cfg80211_scan_done); |
1044 | ||
ca986ad9 AVS |
1045 | void cfg80211_add_sched_scan_req(struct cfg80211_registered_device *rdev, |
1046 | struct cfg80211_sched_scan_request *req) | |
1047 | { | |
a05829a7 | 1048 | lockdep_assert_held(&rdev->wiphy.mtx); |
ca986ad9 AVS |
1049 | |
1050 | list_add_rcu(&req->list, &rdev->sched_scan_req_list); | |
1051 | } | |
1052 | ||
1053 | static void cfg80211_del_sched_scan_req(struct cfg80211_registered_device *rdev, | |
1054 | struct cfg80211_sched_scan_request *req) | |
1055 | { | |
a05829a7 | 1056 | lockdep_assert_held(&rdev->wiphy.mtx); |
ca986ad9 AVS |
1057 | |
1058 | list_del_rcu(&req->list); | |
1059 | kfree_rcu(req, rcu_head); | |
1060 | } | |
1061 | ||
1062 | static struct cfg80211_sched_scan_request * | |
1063 | cfg80211_find_sched_scan_req(struct cfg80211_registered_device *rdev, u64 reqid) | |
1064 | { | |
1065 | struct cfg80211_sched_scan_request *pos; | |
1066 | ||
3ee9306b | 1067 | list_for_each_entry_rcu(pos, &rdev->sched_scan_req_list, list, |
a05829a7 | 1068 | lockdep_is_held(&rdev->wiphy.mtx)) { |
ca986ad9 AVS |
1069 | if (pos->reqid == reqid) |
1070 | return pos; | |
1071 | } | |
b34939b9 | 1072 | return NULL; |
ca986ad9 AVS |
1073 | } |
1074 | ||
1075 | /* | |
1076 | * Determines if a scheduled scan request can be handled. When a legacy | |
1077 | * scheduled scan is running no other scheduled scan is allowed regardless | |
1078 | * whether the request is for legacy or multi-support scan. When a multi-support | |
1079 | * scheduled scan is running a request for legacy scan is not allowed. In this | |
1080 | * case a request for multi-support scan can be handled if resources are | |
1081 | * available, ie. struct wiphy::max_sched_scan_reqs limit is not yet reached. | |
1082 | */ | |
1083 | int cfg80211_sched_scan_req_possible(struct cfg80211_registered_device *rdev, | |
1084 | bool want_multi) | |
1085 | { | |
1086 | struct cfg80211_sched_scan_request *pos; | |
1087 | int i = 0; | |
1088 | ||
1089 | list_for_each_entry(pos, &rdev->sched_scan_req_list, list) { | |
1090 | /* request id zero means legacy in progress */ | |
1091 | if (!i && !pos->reqid) | |
1092 | return -EINPROGRESS; | |
1093 | i++; | |
1094 | } | |
1095 | ||
1096 | if (i) { | |
1097 | /* no legacy allowed when multi request(s) are active */ | |
1098 | if (!want_multi) | |
1099 | return -EINPROGRESS; | |
1100 | ||
1101 | /* resource limit reached */ | |
1102 | if (i == rdev->wiphy.max_sched_scan_reqs) | |
1103 | return -ENOSPC; | |
1104 | } | |
1105 | return 0; | |
1106 | } | |
1107 | ||
b34939b9 | 1108 | void cfg80211_sched_scan_results_wk(struct work_struct *work) |
807f8a8c LC |
1109 | { |
1110 | struct cfg80211_registered_device *rdev; | |
b34939b9 | 1111 | struct cfg80211_sched_scan_request *req, *tmp; |
807f8a8c | 1112 | |
b34939b9 AVS |
1113 | rdev = container_of(work, struct cfg80211_registered_device, |
1114 | sched_scan_res_wk); | |
807f8a8c | 1115 | |
a05829a7 | 1116 | wiphy_lock(&rdev->wiphy); |
b34939b9 AVS |
1117 | list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) { |
1118 | if (req->report_results) { | |
1119 | req->report_results = false; | |
1120 | if (req->flags & NL80211_SCAN_FLAG_FLUSH) { | |
1121 | /* flush entries from previous scans */ | |
1122 | spin_lock_bh(&rdev->bss_lock); | |
1123 | __cfg80211_bss_expire(rdev, req->scan_start); | |
1124 | spin_unlock_bh(&rdev->bss_lock); | |
1125 | req->scan_start = jiffies; | |
1126 | } | |
1127 | nl80211_send_sched_scan(req, | |
1128 | NL80211_CMD_SCHED_SCAN_RESULTS); | |
15d6030b | 1129 | } |
15d6030b | 1130 | } |
a05829a7 | 1131 | wiphy_unlock(&rdev->wiphy); |
807f8a8c LC |
1132 | } |
1133 | ||
b34939b9 | 1134 | void cfg80211_sched_scan_results(struct wiphy *wiphy, u64 reqid) |
807f8a8c | 1135 | { |
ca986ad9 AVS |
1136 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
1137 | struct cfg80211_sched_scan_request *request; | |
1138 | ||
b34939b9 | 1139 | trace_cfg80211_sched_scan_results(wiphy, reqid); |
807f8a8c | 1140 | /* ignore if we're not scanning */ |
31a60ed1 | 1141 | |
1b57b621 | 1142 | rcu_read_lock(); |
b34939b9 AVS |
1143 | request = cfg80211_find_sched_scan_req(rdev, reqid); |
1144 | if (request) { | |
1145 | request->report_results = true; | |
1146 | queue_work(cfg80211_wq, &rdev->sched_scan_res_wk); | |
1147 | } | |
1b57b621 | 1148 | rcu_read_unlock(); |
807f8a8c LC |
1149 | } |
1150 | EXPORT_SYMBOL(cfg80211_sched_scan_results); | |
1151 | ||
a05829a7 | 1152 | void cfg80211_sched_scan_stopped_locked(struct wiphy *wiphy, u64 reqid) |
807f8a8c | 1153 | { |
f26cbf40 | 1154 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
807f8a8c | 1155 | |
a05829a7 | 1156 | lockdep_assert_held(&wiphy->mtx); |
792e6aa7 | 1157 | |
b34939b9 | 1158 | trace_cfg80211_sched_scan_stopped(wiphy, reqid); |
4ee3e063 | 1159 | |
b34939b9 | 1160 | __cfg80211_stop_sched_scan(rdev, reqid, true); |
792e6aa7 | 1161 | } |
a05829a7 | 1162 | EXPORT_SYMBOL(cfg80211_sched_scan_stopped_locked); |
792e6aa7 | 1163 | |
b34939b9 | 1164 | void cfg80211_sched_scan_stopped(struct wiphy *wiphy, u64 reqid) |
792e6aa7 | 1165 | { |
a05829a7 JB |
1166 | wiphy_lock(wiphy); |
1167 | cfg80211_sched_scan_stopped_locked(wiphy, reqid); | |
1168 | wiphy_unlock(wiphy); | |
807f8a8c | 1169 | } |
807f8a8c LC |
1170 | EXPORT_SYMBOL(cfg80211_sched_scan_stopped); |
1171 | ||
ca986ad9 AVS |
1172 | int cfg80211_stop_sched_scan_req(struct cfg80211_registered_device *rdev, |
1173 | struct cfg80211_sched_scan_request *req, | |
1174 | bool driver_initiated) | |
807f8a8c | 1175 | { |
a05829a7 | 1176 | lockdep_assert_held(&rdev->wiphy.mtx); |
807f8a8c | 1177 | |
85a9994a | 1178 | if (!driver_initiated) { |
3a3ecf1d | 1179 | int err = rdev_sched_scan_stop(rdev, req->dev, req->reqid); |
85a9994a LC |
1180 | if (err) |
1181 | return err; | |
1182 | } | |
807f8a8c | 1183 | |
ca986ad9 | 1184 | nl80211_send_sched_scan(req, NL80211_CMD_SCHED_SCAN_STOPPED); |
807f8a8c | 1185 | |
ca986ad9 | 1186 | cfg80211_del_sched_scan_req(rdev, req); |
807f8a8c | 1187 | |
3b4670ff | 1188 | return 0; |
807f8a8c LC |
1189 | } |
1190 | ||
ca986ad9 AVS |
1191 | int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev, |
1192 | u64 reqid, bool driver_initiated) | |
1193 | { | |
1194 | struct cfg80211_sched_scan_request *sched_scan_req; | |
1195 | ||
a05829a7 | 1196 | lockdep_assert_held(&rdev->wiphy.mtx); |
ca986ad9 AVS |
1197 | |
1198 | sched_scan_req = cfg80211_find_sched_scan_req(rdev, reqid); | |
b34939b9 AVS |
1199 | if (!sched_scan_req) |
1200 | return -ENOENT; | |
ca986ad9 AVS |
1201 | |
1202 | return cfg80211_stop_sched_scan_req(rdev, sched_scan_req, | |
1203 | driver_initiated); | |
1204 | } | |
1205 | ||
1b8ec87a | 1206 | void cfg80211_bss_age(struct cfg80211_registered_device *rdev, |
cb3a8eec DW |
1207 | unsigned long age_secs) |
1208 | { | |
1209 | struct cfg80211_internal_bss *bss; | |
1210 | unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); | |
1211 | ||
1b8ec87a ZG |
1212 | spin_lock_bh(&rdev->bss_lock); |
1213 | list_for_each_entry(bss, &rdev->bss_list, list) | |
cb3a8eec | 1214 | bss->ts -= age_jiffies; |
1b8ec87a | 1215 | spin_unlock_bh(&rdev->bss_lock); |
cb3a8eec DW |
1216 | } |
1217 | ||
1b8ec87a | 1218 | void cfg80211_bss_expire(struct cfg80211_registered_device *rdev) |
2a519311 | 1219 | { |
1b8ec87a | 1220 | __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE); |
2a519311 JB |
1221 | } |
1222 | ||
2f1805ea EG |
1223 | void cfg80211_bss_flush(struct wiphy *wiphy) |
1224 | { | |
1225 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); | |
1226 | ||
1227 | spin_lock_bh(&rdev->bss_lock); | |
1228 | __cfg80211_bss_expire(rdev, jiffies); | |
1229 | spin_unlock_bh(&rdev->bss_lock); | |
1230 | } | |
1231 | EXPORT_SYMBOL(cfg80211_bss_flush); | |
1232 | ||
49a68e0d JB |
1233 | const struct element * |
1234 | cfg80211_find_elem_match(u8 eid, const u8 *ies, unsigned int len, | |
1235 | const u8 *match, unsigned int match_len, | |
1236 | unsigned int match_offset) | |
2a519311 | 1237 | { |
0f3b07f0 JB |
1238 | const struct element *elem; |
1239 | ||
0f3b07f0 | 1240 | for_each_element_id(elem, eid, ies, len) { |
49a68e0d JB |
1241 | if (elem->datalen >= match_offset + match_len && |
1242 | !memcmp(elem->data + match_offset, match, match_len)) | |
1243 | return elem; | |
2a519311 | 1244 | } |
fbd05e4a LC |
1245 | |
1246 | return NULL; | |
2a519311 | 1247 | } |
49a68e0d | 1248 | EXPORT_SYMBOL(cfg80211_find_elem_match); |
2a519311 | 1249 | |
49a68e0d JB |
1250 | const struct element *cfg80211_find_vendor_elem(unsigned int oui, int oui_type, |
1251 | const u8 *ies, | |
1252 | unsigned int len) | |
0c28ec58 | 1253 | { |
49a68e0d | 1254 | const struct element *elem; |
fbd05e4a LC |
1255 | u8 match[] = { oui >> 16, oui >> 8, oui, oui_type }; |
1256 | int match_len = (oui_type < 0) ? 3 : sizeof(match); | |
0c28ec58 | 1257 | |
9e9ea439 EG |
1258 | if (WARN_ON(oui_type > 0xff)) |
1259 | return NULL; | |
1260 | ||
49a68e0d JB |
1261 | elem = cfg80211_find_elem_match(WLAN_EID_VENDOR_SPECIFIC, ies, len, |
1262 | match, match_len, 0); | |
6719429d | 1263 | |
49a68e0d | 1264 | if (!elem || elem->datalen < 4) |
fbd05e4a | 1265 | return NULL; |
6719429d | 1266 | |
49a68e0d | 1267 | return elem; |
0c28ec58 | 1268 | } |
49a68e0d | 1269 | EXPORT_SYMBOL(cfg80211_find_vendor_elem); |
0c28ec58 | 1270 | |
4593c4cb JB |
1271 | /** |
1272 | * enum bss_compare_mode - BSS compare mode | |
1273 | * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find) | |
1274 | * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode | |
1275 | * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode | |
1276 | */ | |
1277 | enum bss_compare_mode { | |
1278 | BSS_CMP_REGULAR, | |
1279 | BSS_CMP_HIDE_ZLEN, | |
1280 | BSS_CMP_HIDE_NUL, | |
1281 | }; | |
1282 | ||
dd9dfb9f | 1283 | static int cmp_bss(struct cfg80211_bss *a, |
5622f5bb | 1284 | struct cfg80211_bss *b, |
4593c4cb | 1285 | enum bss_compare_mode mode) |
dd9dfb9f | 1286 | { |
9caf0364 | 1287 | const struct cfg80211_bss_ies *a_ies, *b_ies; |
3af6341c JB |
1288 | const u8 *ie1 = NULL; |
1289 | const u8 *ie2 = NULL; | |
5622f5bb | 1290 | int i, r; |
dd9dfb9f | 1291 | |
3af6341c JB |
1292 | if (a->channel != b->channel) |
1293 | return b->channel->center_freq - a->channel->center_freq; | |
dd9dfb9f | 1294 | |
9caf0364 JB |
1295 | a_ies = rcu_access_pointer(a->ies); |
1296 | if (!a_ies) | |
1297 | return -1; | |
1298 | b_ies = rcu_access_pointer(b->ies); | |
1299 | if (!b_ies) | |
1300 | return 1; | |
1301 | ||
3af6341c JB |
1302 | if (WLAN_CAPABILITY_IS_STA_BSS(a->capability)) |
1303 | ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID, | |
1304 | a_ies->data, a_ies->len); | |
1305 | if (WLAN_CAPABILITY_IS_STA_BSS(b->capability)) | |
1306 | ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID, | |
1307 | b_ies->data, b_ies->len); | |
1308 | if (ie1 && ie2) { | |
1309 | int mesh_id_cmp; | |
1310 | ||
1311 | if (ie1[1] == ie2[1]) | |
1312 | mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]); | |
1313 | else | |
1314 | mesh_id_cmp = ie2[1] - ie1[1]; | |
1315 | ||
1316 | ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, | |
1317 | a_ies->data, a_ies->len); | |
1318 | ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, | |
1319 | b_ies->data, b_ies->len); | |
1320 | if (ie1 && ie2) { | |
1321 | if (mesh_id_cmp) | |
1322 | return mesh_id_cmp; | |
1323 | if (ie1[1] != ie2[1]) | |
1324 | return ie2[1] - ie1[1]; | |
1325 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); | |
1326 | } | |
1327 | } | |
1328 | ||
3af6341c JB |
1329 | r = memcmp(a->bssid, b->bssid, sizeof(a->bssid)); |
1330 | if (r) | |
1331 | return r; | |
1332 | ||
9caf0364 JB |
1333 | ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len); |
1334 | ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len); | |
dd9dfb9f | 1335 | |
5622f5bb JB |
1336 | if (!ie1 && !ie2) |
1337 | return 0; | |
1338 | ||
f94f8b16 | 1339 | /* |
5622f5bb JB |
1340 | * Note that with "hide_ssid", the function returns a match if |
1341 | * the already-present BSS ("b") is a hidden SSID beacon for | |
1342 | * the new BSS ("a"). | |
f94f8b16 | 1343 | */ |
dd9dfb9f DT |
1344 | |
1345 | /* sort missing IE before (left of) present IE */ | |
1346 | if (!ie1) | |
1347 | return -1; | |
1348 | if (!ie2) | |
1349 | return 1; | |
1350 | ||
4593c4cb JB |
1351 | switch (mode) { |
1352 | case BSS_CMP_HIDE_ZLEN: | |
1353 | /* | |
1354 | * In ZLEN mode we assume the BSS entry we're | |
1355 | * looking for has a zero-length SSID. So if | |
1356 | * the one we're looking at right now has that, | |
1357 | * return 0. Otherwise, return the difference | |
1358 | * in length, but since we're looking for the | |
1359 | * 0-length it's really equivalent to returning | |
1360 | * the length of the one we're looking at. | |
1361 | * | |
1362 | * No content comparison is needed as we assume | |
1363 | * the content length is zero. | |
1364 | */ | |
1365 | return ie2[1]; | |
1366 | case BSS_CMP_REGULAR: | |
1367 | default: | |
1368 | /* sort by length first, then by contents */ | |
1369 | if (ie1[1] != ie2[1]) | |
1370 | return ie2[1] - ie1[1]; | |
5622f5bb | 1371 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); |
4593c4cb JB |
1372 | case BSS_CMP_HIDE_NUL: |
1373 | if (ie1[1] != ie2[1]) | |
1374 | return ie2[1] - ie1[1]; | |
1375 | /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */ | |
1376 | for (i = 0; i < ie2[1]; i++) | |
1377 | if (ie2[i + 2]) | |
1378 | return -1; | |
1379 | return 0; | |
1380 | } | |
dd9dfb9f DT |
1381 | } |
1382 | ||
6eb18137 | 1383 | static bool cfg80211_bss_type_match(u16 capability, |
57fbcce3 | 1384 | enum nl80211_band band, |
6eb18137 DL |
1385 | enum ieee80211_bss_type bss_type) |
1386 | { | |
1387 | bool ret = true; | |
1388 | u16 mask, val; | |
1389 | ||
1390 | if (bss_type == IEEE80211_BSS_TYPE_ANY) | |
1391 | return ret; | |
1392 | ||
57fbcce3 | 1393 | if (band == NL80211_BAND_60GHZ) { |
6eb18137 DL |
1394 | mask = WLAN_CAPABILITY_DMG_TYPE_MASK; |
1395 | switch (bss_type) { | |
1396 | case IEEE80211_BSS_TYPE_ESS: | |
1397 | val = WLAN_CAPABILITY_DMG_TYPE_AP; | |
1398 | break; | |
1399 | case IEEE80211_BSS_TYPE_PBSS: | |
1400 | val = WLAN_CAPABILITY_DMG_TYPE_PBSS; | |
1401 | break; | |
1402 | case IEEE80211_BSS_TYPE_IBSS: | |
1403 | val = WLAN_CAPABILITY_DMG_TYPE_IBSS; | |
1404 | break; | |
1405 | default: | |
1406 | return false; | |
1407 | } | |
1408 | } else { | |
1409 | mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS; | |
1410 | switch (bss_type) { | |
1411 | case IEEE80211_BSS_TYPE_ESS: | |
1412 | val = WLAN_CAPABILITY_ESS; | |
1413 | break; | |
1414 | case IEEE80211_BSS_TYPE_IBSS: | |
1415 | val = WLAN_CAPABILITY_IBSS; | |
1416 | break; | |
1417 | case IEEE80211_BSS_TYPE_MBSS: | |
1418 | val = 0; | |
1419 | break; | |
1420 | default: | |
1421 | return false; | |
1422 | } | |
1423 | } | |
1424 | ||
1425 | ret = ((capability & mask) == val); | |
1426 | return ret; | |
1427 | } | |
1428 | ||
0e3a39b5 | 1429 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
2a519311 JB |
1430 | struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, |
1431 | struct ieee80211_channel *channel, | |
1432 | const u8 *bssid, | |
79420f09 | 1433 | const u8 *ssid, size_t ssid_len, |
6eb18137 DL |
1434 | enum ieee80211_bss_type bss_type, |
1435 | enum ieee80211_privacy privacy) | |
2a519311 | 1436 | { |
f26cbf40 | 1437 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
2a519311 | 1438 | struct cfg80211_internal_bss *bss, *res = NULL; |
ccb6c136 | 1439 | unsigned long now = jiffies; |
6eb18137 | 1440 | int bss_privacy; |
2a519311 | 1441 | |
6eb18137 DL |
1442 | trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type, |
1443 | privacy); | |
4ee3e063 | 1444 | |
1b8ec87a | 1445 | spin_lock_bh(&rdev->bss_lock); |
2a519311 | 1446 | |
1b8ec87a | 1447 | list_for_each_entry(bss, &rdev->bss_list, list) { |
6eb18137 DL |
1448 | if (!cfg80211_bss_type_match(bss->pub.capability, |
1449 | bss->pub.channel->band, bss_type)) | |
1450 | continue; | |
1451 | ||
1452 | bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY); | |
1453 | if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) || | |
1454 | (privacy == IEEE80211_PRIVACY_OFF && bss_privacy)) | |
79420f09 | 1455 | continue; |
2a519311 JB |
1456 | if (channel && bss->pub.channel != channel) |
1457 | continue; | |
c14a7400 JB |
1458 | if (!is_valid_ether_addr(bss->pub.bssid)) |
1459 | continue; | |
ccb6c136 JB |
1460 | /* Don't get expired BSS structs */ |
1461 | if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) && | |
1462 | !atomic_read(&bss->hold)) | |
1463 | continue; | |
2a519311 JB |
1464 | if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { |
1465 | res = bss; | |
1b8ec87a | 1466 | bss_ref_get(rdev, res); |
2a519311 JB |
1467 | break; |
1468 | } | |
1469 | } | |
1470 | ||
1b8ec87a | 1471 | spin_unlock_bh(&rdev->bss_lock); |
2a519311 JB |
1472 | if (!res) |
1473 | return NULL; | |
4ee3e063 | 1474 | trace_cfg80211_return_bss(&res->pub); |
2a519311 JB |
1475 | return &res->pub; |
1476 | } | |
1477 | EXPORT_SYMBOL(cfg80211_get_bss); | |
1478 | ||
1b8ec87a | 1479 | static void rb_insert_bss(struct cfg80211_registered_device *rdev, |
2a519311 JB |
1480 | struct cfg80211_internal_bss *bss) |
1481 | { | |
1b8ec87a | 1482 | struct rb_node **p = &rdev->bss_tree.rb_node; |
2a519311 JB |
1483 | struct rb_node *parent = NULL; |
1484 | struct cfg80211_internal_bss *tbss; | |
1485 | int cmp; | |
1486 | ||
1487 | while (*p) { | |
1488 | parent = *p; | |
1489 | tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); | |
1490 | ||
4593c4cb | 1491 | cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR); |
2a519311 JB |
1492 | |
1493 | if (WARN_ON(!cmp)) { | |
1494 | /* will sort of leak this BSS */ | |
1495 | return; | |
1496 | } | |
1497 | ||
1498 | if (cmp < 0) | |
1499 | p = &(*p)->rb_left; | |
1500 | else | |
1501 | p = &(*p)->rb_right; | |
1502 | } | |
1503 | ||
1504 | rb_link_node(&bss->rbn, parent, p); | |
1b8ec87a | 1505 | rb_insert_color(&bss->rbn, &rdev->bss_tree); |
2a519311 JB |
1506 | } |
1507 | ||
1508 | static struct cfg80211_internal_bss * | |
1b8ec87a | 1509 | rb_find_bss(struct cfg80211_registered_device *rdev, |
5622f5bb | 1510 | struct cfg80211_internal_bss *res, |
4593c4cb | 1511 | enum bss_compare_mode mode) |
dd9dfb9f | 1512 | { |
1b8ec87a | 1513 | struct rb_node *n = rdev->bss_tree.rb_node; |
dd9dfb9f DT |
1514 | struct cfg80211_internal_bss *bss; |
1515 | int r; | |
1516 | ||
1517 | while (n) { | |
1518 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); | |
4593c4cb | 1519 | r = cmp_bss(&res->pub, &bss->pub, mode); |
dd9dfb9f DT |
1520 | |
1521 | if (r == 0) | |
1522 | return bss; | |
1523 | else if (r < 0) | |
1524 | n = n->rb_left; | |
1525 | else | |
1526 | n = n->rb_right; | |
1527 | } | |
1528 | ||
1529 | return NULL; | |
1530 | } | |
1531 | ||
1b8ec87a | 1532 | static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev, |
776b3580 | 1533 | struct cfg80211_internal_bss *new) |
dd9dfb9f | 1534 | { |
9caf0364 | 1535 | const struct cfg80211_bss_ies *ies; |
776b3580 JB |
1536 | struct cfg80211_internal_bss *bss; |
1537 | const u8 *ie; | |
1538 | int i, ssidlen; | |
1539 | u8 fold = 0; | |
9853a55e | 1540 | u32 n_entries = 0; |
9caf0364 | 1541 | |
776b3580 | 1542 | ies = rcu_access_pointer(new->pub.beacon_ies); |
9caf0364 | 1543 | if (WARN_ON(!ies)) |
776b3580 | 1544 | return false; |
dd9dfb9f | 1545 | |
776b3580 JB |
1546 | ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); |
1547 | if (!ie) { | |
1548 | /* nothing to do */ | |
1549 | return true; | |
1550 | } | |
1551 | ||
1552 | ssidlen = ie[1]; | |
1553 | for (i = 0; i < ssidlen; i++) | |
1554 | fold |= ie[2 + i]; | |
1555 | ||
1556 | if (fold) { | |
1557 | /* not a hidden SSID */ | |
1558 | return true; | |
1559 | } | |
1560 | ||
1561 | /* This is the bad part ... */ | |
1562 | ||
1b8ec87a | 1563 | list_for_each_entry(bss, &rdev->bss_list, list) { |
9853a55e JB |
1564 | /* |
1565 | * we're iterating all the entries anyway, so take the | |
1566 | * opportunity to validate the list length accounting | |
1567 | */ | |
1568 | n_entries++; | |
1569 | ||
776b3580 JB |
1570 | if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid)) |
1571 | continue; | |
1572 | if (bss->pub.channel != new->pub.channel) | |
1573 | continue; | |
dcd6eac1 SW |
1574 | if (bss->pub.scan_width != new->pub.scan_width) |
1575 | continue; | |
776b3580 JB |
1576 | if (rcu_access_pointer(bss->pub.beacon_ies)) |
1577 | continue; | |
1578 | ies = rcu_access_pointer(bss->pub.ies); | |
1579 | if (!ies) | |
1580 | continue; | |
1581 | ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); | |
1582 | if (!ie) | |
1583 | continue; | |
1584 | if (ssidlen && ie[1] != ssidlen) | |
1585 | continue; | |
776b3580 JB |
1586 | if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss)) |
1587 | continue; | |
1588 | if (WARN_ON_ONCE(!list_empty(&bss->hidden_list))) | |
1589 | list_del(&bss->hidden_list); | |
1590 | /* combine them */ | |
1591 | list_add(&bss->hidden_list, &new->hidden_list); | |
1592 | bss->pub.hidden_beacon_bss = &new->pub; | |
1593 | new->refcount += bss->refcount; | |
1594 | rcu_assign_pointer(bss->pub.beacon_ies, | |
1595 | new->pub.beacon_ies); | |
1596 | } | |
1597 | ||
9853a55e JB |
1598 | WARN_ONCE(n_entries != rdev->bss_entries, |
1599 | "rdev bss entries[%d]/list[len:%d] corruption\n", | |
1600 | rdev->bss_entries, n_entries); | |
1601 | ||
776b3580 | 1602 | return true; |
dd9dfb9f DT |
1603 | } |
1604 | ||
0cd01efb SS |
1605 | struct cfg80211_non_tx_bss { |
1606 | struct cfg80211_bss *tx_bss; | |
1607 | u8 max_bssid_indicator; | |
1608 | u8 bssid_index; | |
1609 | }; | |
1610 | ||
c90b93b5 JB |
1611 | static void cfg80211_update_hidden_bsses(struct cfg80211_internal_bss *known, |
1612 | const struct cfg80211_bss_ies *new_ies, | |
1613 | const struct cfg80211_bss_ies *old_ies) | |
1614 | { | |
1615 | struct cfg80211_internal_bss *bss; | |
1616 | ||
1617 | /* Assign beacon IEs to all sub entries */ | |
1618 | list_for_each_entry(bss, &known->hidden_list, hidden_list) { | |
1619 | const struct cfg80211_bss_ies *ies; | |
1620 | ||
1621 | ies = rcu_access_pointer(bss->pub.beacon_ies); | |
1622 | WARN_ON(ies != old_ies); | |
1623 | ||
1624 | rcu_assign_pointer(bss->pub.beacon_ies, new_ies); | |
1625 | } | |
1626 | } | |
1627 | ||
3ab8227d SM |
1628 | static bool |
1629 | cfg80211_update_known_bss(struct cfg80211_registered_device *rdev, | |
1630 | struct cfg80211_internal_bss *known, | |
1631 | struct cfg80211_internal_bss *new, | |
1632 | bool signal_valid) | |
1633 | { | |
1634 | lockdep_assert_held(&rdev->bss_lock); | |
1635 | ||
1636 | /* Update IEs */ | |
1637 | if (rcu_access_pointer(new->pub.proberesp_ies)) { | |
1638 | const struct cfg80211_bss_ies *old; | |
1639 | ||
1640 | old = rcu_access_pointer(known->pub.proberesp_ies); | |
1641 | ||
1642 | rcu_assign_pointer(known->pub.proberesp_ies, | |
1643 | new->pub.proberesp_ies); | |
1644 | /* Override possible earlier Beacon frame IEs */ | |
1645 | rcu_assign_pointer(known->pub.ies, | |
1646 | new->pub.proberesp_ies); | |
1647 | if (old) | |
1648 | kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head); | |
1649 | } else if (rcu_access_pointer(new->pub.beacon_ies)) { | |
1650 | const struct cfg80211_bss_ies *old; | |
3ab8227d SM |
1651 | |
1652 | if (known->pub.hidden_beacon_bss && | |
1653 | !list_empty(&known->hidden_list)) { | |
1654 | const struct cfg80211_bss_ies *f; | |
1655 | ||
1656 | /* The known BSS struct is one of the probe | |
1657 | * response members of a group, but we're | |
1658 | * receiving a beacon (beacon_ies in the new | |
1659 | * bss is used). This can only mean that the | |
1660 | * AP changed its beacon from not having an | |
1661 | * SSID to showing it, which is confusing so | |
1662 | * drop this information. | |
1663 | */ | |
1664 | ||
1665 | f = rcu_access_pointer(new->pub.beacon_ies); | |
1666 | kfree_rcu((struct cfg80211_bss_ies *)f, rcu_head); | |
1667 | return false; | |
1668 | } | |
1669 | ||
1670 | old = rcu_access_pointer(known->pub.beacon_ies); | |
1671 | ||
1672 | rcu_assign_pointer(known->pub.beacon_ies, new->pub.beacon_ies); | |
1673 | ||
1674 | /* Override IEs if they were from a beacon before */ | |
1675 | if (old == rcu_access_pointer(known->pub.ies)) | |
1676 | rcu_assign_pointer(known->pub.ies, new->pub.beacon_ies); | |
1677 | ||
03c0ad4b JB |
1678 | cfg80211_update_hidden_bsses(known, |
1679 | rcu_access_pointer(new->pub.beacon_ies), | |
1680 | old); | |
3ab8227d SM |
1681 | |
1682 | if (old) | |
1683 | kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head); | |
1684 | } | |
1685 | ||
1686 | known->pub.beacon_interval = new->pub.beacon_interval; | |
1687 | ||
1688 | /* don't update the signal if beacon was heard on | |
1689 | * adjacent channel. | |
1690 | */ | |
1691 | if (signal_valid) | |
1692 | known->pub.signal = new->pub.signal; | |
1693 | known->pub.capability = new->pub.capability; | |
1694 | known->ts = new->ts; | |
1695 | known->ts_boottime = new->ts_boottime; | |
1696 | known->parent_tsf = new->parent_tsf; | |
1697 | known->pub.chains = new->pub.chains; | |
1698 | memcpy(known->pub.chain_signal, new->pub.chain_signal, | |
1699 | IEEE80211_MAX_CHAINS); | |
1700 | ether_addr_copy(known->parent_bssid, new->parent_bssid); | |
1701 | known->pub.max_bssid_indicator = new->pub.max_bssid_indicator; | |
1702 | known->pub.bssid_index = new->pub.bssid_index; | |
1703 | ||
1704 | return true; | |
1705 | } | |
1706 | ||
0e3a39b5 | 1707 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
a3ce17d1 | 1708 | struct cfg80211_internal_bss * |
1b8ec87a | 1709 | cfg80211_bss_update(struct cfg80211_registered_device *rdev, |
3afc2167 | 1710 | struct cfg80211_internal_bss *tmp, |
a3ce17d1 | 1711 | bool signal_valid, unsigned long ts) |
2a519311 JB |
1712 | { |
1713 | struct cfg80211_internal_bss *found = NULL; | |
2a519311 | 1714 | |
9caf0364 | 1715 | if (WARN_ON(!tmp->pub.channel)) |
2a519311 | 1716 | return NULL; |
2a519311 | 1717 | |
a3ce17d1 | 1718 | tmp->ts = ts; |
2a519311 | 1719 | |
1b8ec87a | 1720 | spin_lock_bh(&rdev->bss_lock); |
2a519311 | 1721 | |
9caf0364 | 1722 | if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) { |
1b8ec87a | 1723 | spin_unlock_bh(&rdev->bss_lock); |
9caf0364 JB |
1724 | return NULL; |
1725 | } | |
1726 | ||
1b8ec87a | 1727 | found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR); |
2a519311 | 1728 | |
cd1658f5 | 1729 | if (found) { |
3ab8227d SM |
1730 | if (!cfg80211_update_known_bss(rdev, found, tmp, signal_valid)) |
1731 | goto drop; | |
2a519311 | 1732 | } else { |
9caf0364 | 1733 | struct cfg80211_internal_bss *new; |
dd9dfb9f | 1734 | struct cfg80211_internal_bss *hidden; |
9caf0364 | 1735 | struct cfg80211_bss_ies *ies; |
dd9dfb9f | 1736 | |
9caf0364 JB |
1737 | /* |
1738 | * create a copy -- the "res" variable that is passed in | |
1739 | * is allocated on the stack since it's not needed in the | |
1740 | * more common case of an update | |
1741 | */ | |
1b8ec87a | 1742 | new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size, |
9caf0364 JB |
1743 | GFP_ATOMIC); |
1744 | if (!new) { | |
1745 | ies = (void *)rcu_dereference(tmp->pub.beacon_ies); | |
1746 | if (ies) | |
1747 | kfree_rcu(ies, rcu_head); | |
1748 | ies = (void *)rcu_dereference(tmp->pub.proberesp_ies); | |
1749 | if (ies) | |
1750 | kfree_rcu(ies, rcu_head); | |
776b3580 | 1751 | goto drop; |
9caf0364 JB |
1752 | } |
1753 | memcpy(new, tmp, sizeof(*new)); | |
776b3580 JB |
1754 | new->refcount = 1; |
1755 | INIT_LIST_HEAD(&new->hidden_list); | |
7011ba58 | 1756 | INIT_LIST_HEAD(&new->pub.nontrans_list); |
0b780881 JB |
1757 | /* we'll set this later if it was non-NULL */ |
1758 | new->pub.transmitted_bss = NULL; | |
776b3580 JB |
1759 | |
1760 | if (rcu_access_pointer(tmp->pub.proberesp_ies)) { | |
1b8ec87a | 1761 | hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN); |
776b3580 | 1762 | if (!hidden) |
1b8ec87a | 1763 | hidden = rb_find_bss(rdev, tmp, |
776b3580 JB |
1764 | BSS_CMP_HIDE_NUL); |
1765 | if (hidden) { | |
1766 | new->pub.hidden_beacon_bss = &hidden->pub; | |
1767 | list_add(&new->hidden_list, | |
1768 | &hidden->hidden_list); | |
1769 | hidden->refcount++; | |
1770 | rcu_assign_pointer(new->pub.beacon_ies, | |
1771 | hidden->pub.beacon_ies); | |
1772 | } | |
1773 | } else { | |
1774 | /* | |
1775 | * Ok so we found a beacon, and don't have an entry. If | |
1776 | * it's a beacon with hidden SSID, we might be in for an | |
1777 | * expensive search for any probe responses that should | |
1778 | * be grouped with this beacon for updates ... | |
1779 | */ | |
1b8ec87a | 1780 | if (!cfg80211_combine_bsses(rdev, new)) { |
f9a5c358 | 1781 | bss_ref_put(rdev, new); |
776b3580 JB |
1782 | goto drop; |
1783 | } | |
1784 | } | |
1785 | ||
9853a55e JB |
1786 | if (rdev->bss_entries >= bss_entries_limit && |
1787 | !cfg80211_bss_expire_oldest(rdev)) { | |
f9a5c358 | 1788 | bss_ref_put(rdev, new); |
9853a55e JB |
1789 | goto drop; |
1790 | } | |
1791 | ||
a3584f56 | 1792 | /* This must be before the call to bss_ref_get */ |
0cd01efb | 1793 | if (tmp->pub.transmitted_bss) { |
a3584f56 | 1794 | struct cfg80211_internal_bss *pbss = |
0cd01efb | 1795 | container_of(tmp->pub.transmitted_bss, |
a3584f56 SS |
1796 | struct cfg80211_internal_bss, |
1797 | pub); | |
1798 | ||
0cd01efb | 1799 | new->pub.transmitted_bss = tmp->pub.transmitted_bss; |
a3584f56 SS |
1800 | bss_ref_get(rdev, pbss); |
1801 | } | |
1802 | ||
1b8ec87a | 1803 | list_add_tail(&new->list, &rdev->bss_list); |
9853a55e | 1804 | rdev->bss_entries++; |
1b8ec87a | 1805 | rb_insert_bss(rdev, new); |
9caf0364 | 1806 | found = new; |
2a519311 JB |
1807 | } |
1808 | ||
1b8ec87a ZG |
1809 | rdev->bss_generation++; |
1810 | bss_ref_get(rdev, found); | |
1811 | spin_unlock_bh(&rdev->bss_lock); | |
2a519311 | 1812 | |
2a519311 | 1813 | return found; |
776b3580 | 1814 | drop: |
1b8ec87a | 1815 | spin_unlock_bh(&rdev->bss_lock); |
776b3580 | 1816 | return NULL; |
2a519311 JB |
1817 | } |
1818 | ||
97981d89 | 1819 | int cfg80211_get_ies_channel_number(const u8 *ie, size_t ielen, |
7f599aec AB |
1820 | enum nl80211_band band, |
1821 | enum cfg80211_bss_frame_type ftype) | |
0172bb75 | 1822 | { |
75cca1fa | 1823 | const struct element *tmp; |
0172bb75 | 1824 | |
7f599aec | 1825 | if (band == NL80211_BAND_6GHZ) { |
7f599aec AB |
1826 | struct ieee80211_he_operation *he_oper; |
1827 | ||
75cca1fa JB |
1828 | tmp = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION, ie, |
1829 | ielen); | |
1830 | if (tmp && tmp->datalen >= sizeof(*he_oper) && | |
1831 | tmp->datalen >= ieee80211_he_oper_size(&tmp->data[1])) { | |
7f599aec AB |
1832 | const struct ieee80211_he_6ghz_oper *he_6ghz_oper; |
1833 | ||
75cca1fa | 1834 | he_oper = (void *)&tmp->data[1]; |
7f599aec AB |
1835 | |
1836 | he_6ghz_oper = ieee80211_he_6ghz_oper(he_oper); | |
1837 | if (!he_6ghz_oper) | |
75cca1fa | 1838 | return -1; |
7f599aec AB |
1839 | |
1840 | if (ftype != CFG80211_BSS_FTYPE_BEACON || | |
1841 | he_6ghz_oper->control & IEEE80211_HE_6GHZ_OPER_CTRL_DUP_BEACON) | |
75cca1fa | 1842 | return he_6ghz_oper->primary; |
7f599aec AB |
1843 | } |
1844 | } else if (band == NL80211_BAND_S1GHZ) { | |
75cca1fa JB |
1845 | tmp = cfg80211_find_elem(WLAN_EID_S1G_OPERATION, ie, ielen); |
1846 | if (tmp && tmp->datalen >= sizeof(struct ieee80211_s1g_oper_ie)) { | |
1847 | struct ieee80211_s1g_oper_ie *s1gop = (void *)tmp->data; | |
66b0564d | 1848 | |
e847ffe2 | 1849 | return s1gop->oper_ch; |
66b0564d | 1850 | } |
0172bb75 | 1851 | } else { |
75cca1fa JB |
1852 | tmp = cfg80211_find_elem(WLAN_EID_DS_PARAMS, ie, ielen); |
1853 | if (tmp && tmp->datalen == 1) | |
1854 | return tmp->data[0]; | |
0172bb75 | 1855 | |
75cca1fa JB |
1856 | tmp = cfg80211_find_elem(WLAN_EID_HT_OPERATION, ie, ielen); |
1857 | if (tmp && | |
1858 | tmp->datalen >= sizeof(struct ieee80211_ht_operation)) { | |
1859 | struct ieee80211_ht_operation *htop = (void *)tmp->data; | |
1860 | ||
1861 | return htop->primary_chan; | |
0172bb75 JB |
1862 | } |
1863 | } | |
1864 | ||
75cca1fa | 1865 | return -1; |
97981d89 WG |
1866 | } |
1867 | EXPORT_SYMBOL(cfg80211_get_ies_channel_number); | |
1868 | ||
1869 | /* | |
1870 | * Update RX channel information based on the available frame payload | |
1871 | * information. This is mainly for the 2.4 GHz band where frames can be received | |
1872 | * from neighboring channels and the Beacon frames use the DSSS Parameter Set | |
1873 | * element to indicate the current (transmitting) channel, but this might also | |
1874 | * be needed on other bands if RX frequency does not match with the actual | |
7f599aec | 1875 | * operating channel of a BSS, or if the AP reports a different primary channel. |
97981d89 WG |
1876 | */ |
1877 | static struct ieee80211_channel * | |
1878 | cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen, | |
1879 | struct ieee80211_channel *channel, | |
7f599aec AB |
1880 | enum nl80211_bss_scan_width scan_width, |
1881 | enum cfg80211_bss_frame_type ftype) | |
97981d89 WG |
1882 | { |
1883 | u32 freq; | |
1884 | int channel_number; | |
1885 | struct ieee80211_channel *alt_channel; | |
1886 | ||
7f599aec AB |
1887 | channel_number = cfg80211_get_ies_channel_number(ie, ielen, |
1888 | channel->band, ftype); | |
97981d89 | 1889 | |
119f94a6 JM |
1890 | if (channel_number < 0) { |
1891 | /* No channel information in frame payload */ | |
0172bb75 | 1892 | return channel; |
119f94a6 | 1893 | } |
0172bb75 | 1894 | |
934f4c7d | 1895 | freq = ieee80211_channel_to_freq_khz(channel_number, channel->band); |
7f599aec AB |
1896 | |
1897 | /* | |
1898 | * In 6GHz, duplicated beacon indication is relevant for | |
1899 | * beacons only. | |
1900 | */ | |
1901 | if (channel->band == NL80211_BAND_6GHZ && | |
1902 | (freq == channel->center_freq || | |
1903 | abs(freq - channel->center_freq) > 80)) | |
1904 | return channel; | |
1905 | ||
934f4c7d | 1906 | alt_channel = ieee80211_get_channel_khz(wiphy, freq); |
119f94a6 JM |
1907 | if (!alt_channel) { |
1908 | if (channel->band == NL80211_BAND_2GHZ) { | |
1909 | /* | |
1910 | * Better not allow unexpected channels when that could | |
1911 | * be going beyond the 1-11 range (e.g., discovering | |
1912 | * BSS on channel 12 when radio is configured for | |
1913 | * channel 11. | |
1914 | */ | |
1915 | return NULL; | |
1916 | } | |
1917 | ||
1918 | /* No match for the payload channel number - ignore it */ | |
1919 | return channel; | |
1920 | } | |
1921 | ||
1922 | if (scan_width == NL80211_BSS_CHAN_WIDTH_10 || | |
1923 | scan_width == NL80211_BSS_CHAN_WIDTH_5) { | |
1924 | /* | |
1925 | * Ignore channel number in 5 and 10 MHz channels where there | |
1926 | * may not be an n:1 or 1:n mapping between frequencies and | |
1927 | * channel numbers. | |
1928 | */ | |
1929 | return channel; | |
1930 | } | |
1931 | ||
1932 | /* | |
1933 | * Use the channel determined through the payload channel number | |
1934 | * instead of the RX channel reported by the driver. | |
1935 | */ | |
1936 | if (alt_channel->flags & IEEE80211_CHAN_DISABLED) | |
0172bb75 | 1937 | return NULL; |
119f94a6 | 1938 | return alt_channel; |
0172bb75 JB |
1939 | } |
1940 | ||
0e3a39b5 | 1941 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
0b8fb823 PX |
1942 | static struct cfg80211_bss * |
1943 | cfg80211_inform_single_bss_data(struct wiphy *wiphy, | |
1944 | struct cfg80211_inform_bss *data, | |
1945 | enum cfg80211_bss_frame_type ftype, | |
1946 | const u8 *bssid, u64 tsf, u16 capability, | |
1947 | u16 beacon_interval, const u8 *ie, size_t ielen, | |
0cd01efb | 1948 | struct cfg80211_non_tx_bss *non_tx_data, |
0b8fb823 | 1949 | gfp_t gfp) |
06aa7afa | 1950 | { |
0b8fb823 | 1951 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
9caf0364 | 1952 | struct cfg80211_bss_ies *ies; |
3afc2167 | 1953 | struct ieee80211_channel *channel; |
7011ba58 | 1954 | struct cfg80211_internal_bss tmp = {}, *res; |
6eb18137 | 1955 | int bss_type; |
67af9811 | 1956 | bool signal_valid; |
60d7dfea | 1957 | unsigned long ts; |
06aa7afa JK |
1958 | |
1959 | if (WARN_ON(!wiphy)) | |
1960 | return NULL; | |
1961 | ||
22fe88d3 | 1962 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
6e19bc4b | 1963 | (data->signal < 0 || data->signal > 100))) |
06aa7afa JK |
1964 | return NULL; |
1965 | ||
119f94a6 | 1966 | channel = cfg80211_get_bss_channel(wiphy, ie, ielen, data->chan, |
7f599aec | 1967 | data->scan_width, ftype); |
0172bb75 JB |
1968 | if (!channel) |
1969 | return NULL; | |
1970 | ||
9caf0364 JB |
1971 | memcpy(tmp.pub.bssid, bssid, ETH_ALEN); |
1972 | tmp.pub.channel = channel; | |
6e19bc4b DS |
1973 | tmp.pub.scan_width = data->scan_width; |
1974 | tmp.pub.signal = data->signal; | |
9caf0364 JB |
1975 | tmp.pub.beacon_interval = beacon_interval; |
1976 | tmp.pub.capability = capability; | |
6e19bc4b | 1977 | tmp.ts_boottime = data->boottime_ns; |
b45a19dd IP |
1978 | tmp.parent_tsf = data->parent_tsf; |
1979 | ether_addr_copy(tmp.parent_bssid, data->parent_bssid); | |
1980 | ||
0cd01efb SS |
1981 | if (non_tx_data) { |
1982 | tmp.pub.transmitted_bss = non_tx_data->tx_bss; | |
60d7dfea | 1983 | ts = bss_from_pub(non_tx_data->tx_bss)->ts; |
0cd01efb SS |
1984 | tmp.pub.bssid_index = non_tx_data->bssid_index; |
1985 | tmp.pub.max_bssid_indicator = non_tx_data->max_bssid_indicator; | |
60d7dfea JB |
1986 | } else { |
1987 | ts = jiffies; | |
0cd01efb | 1988 | } |
6e19bc4b | 1989 | |
34a6eddb | 1990 | /* |
5bc8c1f2 | 1991 | * If we do not know here whether the IEs are from a Beacon or Probe |
34a6eddb JM |
1992 | * Response frame, we need to pick one of the options and only use it |
1993 | * with the driver that does not provide the full Beacon/Probe Response | |
1994 | * frame. Use Beacon frame pointer to avoid indicating that this should | |
50521aa8 | 1995 | * override the IEs pointer should we have received an earlier |
9caf0364 | 1996 | * indication of Probe Response data. |
34a6eddb | 1997 | */ |
0e227084 | 1998 | ies = kzalloc(sizeof(*ies) + ielen, gfp); |
9caf0364 JB |
1999 | if (!ies) |
2000 | return NULL; | |
2001 | ies->len = ielen; | |
8cef2c9d | 2002 | ies->tsf = tsf; |
0e227084 | 2003 | ies->from_beacon = false; |
9caf0364 | 2004 | memcpy(ies->data, ie, ielen); |
06aa7afa | 2005 | |
5bc8c1f2 JB |
2006 | switch (ftype) { |
2007 | case CFG80211_BSS_FTYPE_BEACON: | |
2008 | ies->from_beacon = true; | |
7b506ff6 | 2009 | fallthrough; |
5bc8c1f2 JB |
2010 | case CFG80211_BSS_FTYPE_UNKNOWN: |
2011 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); | |
2012 | break; | |
2013 | case CFG80211_BSS_FTYPE_PRESP: | |
2014 | rcu_assign_pointer(tmp.pub.proberesp_ies, ies); | |
2015 | break; | |
2016 | } | |
9caf0364 | 2017 | rcu_assign_pointer(tmp.pub.ies, ies); |
06aa7afa | 2018 | |
7bb106eb | 2019 | signal_valid = data->chan == channel; |
60d7dfea | 2020 | res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid, ts); |
06aa7afa JK |
2021 | if (!res) |
2022 | return NULL; | |
2023 | ||
57fbcce3 | 2024 | if (channel->band == NL80211_BAND_60GHZ) { |
6eb18137 DL |
2025 | bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK; |
2026 | if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP || | |
2027 | bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS) | |
2028 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
2029 | } else { | |
2030 | if (res->pub.capability & WLAN_CAPABILITY_ESS) | |
2031 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
2032 | } | |
06aa7afa | 2033 | |
b0d1d7ff | 2034 | if (non_tx_data) { |
0b8fb823 PX |
2035 | /* this is a nontransmitting bss, we need to add it to |
2036 | * transmitting bss' list if it is not there | |
2037 | */ | |
a5199b56 | 2038 | spin_lock_bh(&rdev->bss_lock); |
0cd01efb SS |
2039 | if (cfg80211_add_nontrans_list(non_tx_data->tx_bss, |
2040 | &res->pub)) { | |
0b780881 | 2041 | if (__cfg80211_unlink_bss(rdev, res)) { |
0b8fb823 | 2042 | rdev->bss_generation++; |
0b780881 JB |
2043 | res = NULL; |
2044 | } | |
0b8fb823 | 2045 | } |
a5199b56 | 2046 | spin_unlock_bh(&rdev->bss_lock); |
0b780881 JB |
2047 | |
2048 | if (!res) | |
2049 | return NULL; | |
0b8fb823 PX |
2050 | } |
2051 | ||
4ee3e063 | 2052 | trace_cfg80211_return_bss(&res->pub); |
06aa7afa JK |
2053 | /* cfg80211_bss_update gives us a referenced result */ |
2054 | return &res->pub; | |
2055 | } | |
06aa7afa | 2056 | |
fe806e49 SS |
2057 | static const struct element |
2058 | *cfg80211_get_profile_continuation(const u8 *ie, size_t ielen, | |
2059 | const struct element *mbssid_elem, | |
2060 | const struct element *sub_elem) | |
2061 | { | |
2062 | const u8 *mbssid_end = mbssid_elem->data + mbssid_elem->datalen; | |
2063 | const struct element *next_mbssid; | |
2064 | const struct element *next_sub; | |
2065 | ||
2066 | next_mbssid = cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID, | |
2067 | mbssid_end, | |
2068 | ielen - (mbssid_end - ie)); | |
2069 | ||
2070 | /* | |
8cf5c86d | 2071 | * If it is not the last subelement in current MBSSID IE or there isn't |
fe806e49 SS |
2072 | * a next MBSSID IE - profile is complete. |
2073 | */ | |
2074 | if ((sub_elem->data + sub_elem->datalen < mbssid_end - 1) || | |
2075 | !next_mbssid) | |
2076 | return NULL; | |
2077 | ||
2078 | /* For any length error, just return NULL */ | |
2079 | ||
2080 | if (next_mbssid->datalen < 4) | |
2081 | return NULL; | |
2082 | ||
2083 | next_sub = (void *)&next_mbssid->data[1]; | |
2084 | ||
2085 | if (next_mbssid->data + next_mbssid->datalen < | |
2086 | next_sub->data + next_sub->datalen) | |
2087 | return NULL; | |
2088 | ||
2089 | if (next_sub->id != 0 || next_sub->datalen < 2) | |
2090 | return NULL; | |
2091 | ||
2092 | /* | |
2093 | * Check if the first element in the next sub element is a start | |
2094 | * of a new profile | |
2095 | */ | |
2096 | return next_sub->data[0] == WLAN_EID_NON_TX_BSSID_CAP ? | |
2097 | NULL : next_mbssid; | |
2098 | } | |
2099 | ||
2100 | size_t cfg80211_merge_profile(const u8 *ie, size_t ielen, | |
2101 | const struct element *mbssid_elem, | |
2102 | const struct element *sub_elem, | |
5809a5d5 | 2103 | u8 *merged_ie, size_t max_copy_len) |
fe806e49 SS |
2104 | { |
2105 | size_t copied_len = sub_elem->datalen; | |
2106 | const struct element *next_mbssid; | |
2107 | ||
2108 | if (sub_elem->datalen > max_copy_len) | |
2109 | return 0; | |
2110 | ||
5809a5d5 | 2111 | memcpy(merged_ie, sub_elem->data, sub_elem->datalen); |
fe806e49 SS |
2112 | |
2113 | while ((next_mbssid = cfg80211_get_profile_continuation(ie, ielen, | |
2114 | mbssid_elem, | |
2115 | sub_elem))) { | |
2116 | const struct element *next_sub = (void *)&next_mbssid->data[1]; | |
2117 | ||
2118 | if (copied_len + next_sub->datalen > max_copy_len) | |
2119 | break; | |
5809a5d5 | 2120 | memcpy(merged_ie + copied_len, next_sub->data, |
fe806e49 SS |
2121 | next_sub->datalen); |
2122 | copied_len += next_sub->datalen; | |
2123 | } | |
2124 | ||
2125 | return copied_len; | |
2126 | } | |
2127 | EXPORT_SYMBOL(cfg80211_merge_profile); | |
2128 | ||
0b8fb823 PX |
2129 | static void cfg80211_parse_mbssid_data(struct wiphy *wiphy, |
2130 | struct cfg80211_inform_bss *data, | |
2131 | enum cfg80211_bss_frame_type ftype, | |
2132 | const u8 *bssid, u64 tsf, | |
2133 | u16 beacon_interval, const u8 *ie, | |
2134 | size_t ielen, | |
0cd01efb | 2135 | struct cfg80211_non_tx_bss *non_tx_data, |
0b8fb823 PX |
2136 | gfp_t gfp) |
2137 | { | |
1c8745f3 JB |
2138 | const u8 *mbssid_index_ie; |
2139 | const struct element *elem, *sub; | |
2140 | size_t new_ie_len; | |
0b8fb823 | 2141 | u8 new_bssid[ETH_ALEN]; |
fe806e49 SS |
2142 | u8 *new_ie, *profile; |
2143 | u64 seen_indices = 0; | |
0b8fb823 PX |
2144 | u16 capability; |
2145 | struct cfg80211_bss *bss; | |
2146 | ||
0cd01efb | 2147 | if (!non_tx_data) |
0b8fb823 | 2148 | return; |
a3eca817 | 2149 | if (!cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID, ie, ielen)) |
0b8fb823 | 2150 | return; |
213ed579 SS |
2151 | if (!wiphy->support_mbssid) |
2152 | return; | |
2153 | if (wiphy->support_only_he_mbssid && | |
a3eca817 | 2154 | !cfg80211_find_ext_elem(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen)) |
213ed579 | 2155 | return; |
0b8fb823 | 2156 | |
0b8fb823 PX |
2157 | new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp); |
2158 | if (!new_ie) | |
2159 | return; | |
2160 | ||
fe806e49 SS |
2161 | profile = kmalloc(ielen, gfp); |
2162 | if (!profile) | |
2163 | goto out; | |
2164 | ||
1c8745f3 JB |
2165 | for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, ie, ielen) { |
2166 | if (elem->datalen < 4) | |
2167 | continue; | |
8f033d2b JB |
2168 | if (elem->data[0] < 1 || (int)elem->data[0] > 8) |
2169 | continue; | |
1c8745f3 | 2170 | for_each_element(sub, elem->data + 1, elem->datalen - 1) { |
fe806e49 SS |
2171 | u8 profile_len; |
2172 | ||
1c8745f3 | 2173 | if (sub->id != 0 || sub->datalen < 4) { |
0b8fb823 PX |
2174 | /* not a valid BSS profile */ |
2175 | continue; | |
2176 | } | |
2177 | ||
1c8745f3 JB |
2178 | if (sub->data[0] != WLAN_EID_NON_TX_BSSID_CAP || |
2179 | sub->data[1] != 2) { | |
0b8fb823 PX |
2180 | /* The first element within the Nontransmitted |
2181 | * BSSID Profile is not the Nontransmitted | |
2182 | * BSSID Capability element. | |
2183 | */ | |
2184 | continue; | |
2185 | } | |
2186 | ||
fe806e49 SS |
2187 | memset(profile, 0, ielen); |
2188 | profile_len = cfg80211_merge_profile(ie, ielen, | |
2189 | elem, | |
2190 | sub, | |
5809a5d5 | 2191 | profile, |
fe806e49 SS |
2192 | ielen); |
2193 | ||
0b8fb823 PX |
2194 | /* found a Nontransmitted BSSID Profile */ |
2195 | mbssid_index_ie = cfg80211_find_ie | |
2196 | (WLAN_EID_MULTI_BSSID_IDX, | |
fe806e49 | 2197 | profile, profile_len); |
0b8fb823 | 2198 | if (!mbssid_index_ie || mbssid_index_ie[1] < 1 || |
fe806e49 SS |
2199 | mbssid_index_ie[2] == 0 || |
2200 | mbssid_index_ie[2] > 46) { | |
0b8fb823 PX |
2201 | /* No valid Multiple BSSID-Index element */ |
2202 | continue; | |
2203 | } | |
2204 | ||
ebb3ca3b | 2205 | if (seen_indices & BIT_ULL(mbssid_index_ie[2])) |
fe806e49 SS |
2206 | /* We don't support legacy split of a profile */ |
2207 | net_dbg_ratelimited("Partial info for BSSID index %d\n", | |
2208 | mbssid_index_ie[2]); | |
2209 | ||
ebb3ca3b | 2210 | seen_indices |= BIT_ULL(mbssid_index_ie[2]); |
fe806e49 | 2211 | |
0cd01efb SS |
2212 | non_tx_data->bssid_index = mbssid_index_ie[2]; |
2213 | non_tx_data->max_bssid_indicator = elem->data[0]; | |
2214 | ||
2215 | cfg80211_gen_new_bssid(bssid, | |
2216 | non_tx_data->max_bssid_indicator, | |
2217 | non_tx_data->bssid_index, | |
0b8fb823 PX |
2218 | new_bssid); |
2219 | memset(new_ie, 0, IEEE80211_MAX_DATA_LEN); | |
fe806e49 SS |
2220 | new_ie_len = cfg80211_gen_new_ie(ie, ielen, |
2221 | profile, | |
2222 | profile_len, new_ie, | |
0b8fb823 PX |
2223 | gfp); |
2224 | if (!new_ie_len) | |
2225 | continue; | |
2226 | ||
fe806e49 | 2227 | capability = get_unaligned_le16(profile + 2); |
0b8fb823 PX |
2228 | bss = cfg80211_inform_single_bss_data(wiphy, data, |
2229 | ftype, | |
2230 | new_bssid, tsf, | |
2231 | capability, | |
2232 | beacon_interval, | |
2233 | new_ie, | |
2234 | new_ie_len, | |
0cd01efb SS |
2235 | non_tx_data, |
2236 | gfp); | |
0b8fb823 PX |
2237 | if (!bss) |
2238 | break; | |
2239 | cfg80211_put_bss(wiphy, bss); | |
2240 | } | |
0b8fb823 PX |
2241 | } |
2242 | ||
fe806e49 | 2243 | out: |
0b8fb823 | 2244 | kfree(new_ie); |
fe806e49 | 2245 | kfree(profile); |
0b8fb823 PX |
2246 | } |
2247 | ||
2a519311 | 2248 | struct cfg80211_bss * |
0b8fb823 PX |
2249 | cfg80211_inform_bss_data(struct wiphy *wiphy, |
2250 | struct cfg80211_inform_bss *data, | |
2251 | enum cfg80211_bss_frame_type ftype, | |
2252 | const u8 *bssid, u64 tsf, u16 capability, | |
2253 | u16 beacon_interval, const u8 *ie, size_t ielen, | |
2254 | gfp_t gfp) | |
2255 | { | |
2256 | struct cfg80211_bss *res; | |
0cd01efb | 2257 | struct cfg80211_non_tx_bss non_tx_data; |
0b8fb823 PX |
2258 | |
2259 | res = cfg80211_inform_single_bss_data(wiphy, data, ftype, bssid, tsf, | |
2260 | capability, beacon_interval, ie, | |
2261 | ielen, NULL, gfp); | |
b0d1d7ff JB |
2262 | if (!res) |
2263 | return NULL; | |
0cd01efb | 2264 | non_tx_data.tx_bss = res; |
0b8fb823 | 2265 | cfg80211_parse_mbssid_data(wiphy, data, ftype, bssid, tsf, |
0cd01efb SS |
2266 | beacon_interval, ie, ielen, &non_tx_data, |
2267 | gfp); | |
0b8fb823 PX |
2268 | return res; |
2269 | } | |
2270 | EXPORT_SYMBOL(cfg80211_inform_bss_data); | |
2271 | ||
2272 | static void | |
2273 | cfg80211_parse_mbssid_frame_data(struct wiphy *wiphy, | |
2274 | struct cfg80211_inform_bss *data, | |
2275 | struct ieee80211_mgmt *mgmt, size_t len, | |
0cd01efb | 2276 | struct cfg80211_non_tx_bss *non_tx_data, |
0b8fb823 PX |
2277 | gfp_t gfp) |
2278 | { | |
2279 | enum cfg80211_bss_frame_type ftype; | |
2280 | const u8 *ie = mgmt->u.probe_resp.variable; | |
2281 | size_t ielen = len - offsetof(struct ieee80211_mgmt, | |
2282 | u.probe_resp.variable); | |
2283 | ||
2284 | ftype = ieee80211_is_beacon(mgmt->frame_control) ? | |
2285 | CFG80211_BSS_FTYPE_BEACON : CFG80211_BSS_FTYPE_PRESP; | |
2286 | ||
2287 | cfg80211_parse_mbssid_data(wiphy, data, ftype, mgmt->bssid, | |
2288 | le64_to_cpu(mgmt->u.probe_resp.timestamp), | |
2289 | le16_to_cpu(mgmt->u.probe_resp.beacon_int), | |
0cd01efb | 2290 | ie, ielen, non_tx_data, gfp); |
0b8fb823 PX |
2291 | } |
2292 | ||
2293 | static void | |
2294 | cfg80211_update_notlisted_nontrans(struct wiphy *wiphy, | |
7011ba58 | 2295 | struct cfg80211_bss *nontrans_bss, |
461c4c2b | 2296 | struct ieee80211_mgmt *mgmt, size_t len) |
0b8fb823 PX |
2297 | { |
2298 | u8 *ie, *new_ie, *pos; | |
fb8b53ac JB |
2299 | const struct element *nontrans_ssid; |
2300 | const u8 *trans_ssid, *mbssid; | |
0b8fb823 PX |
2301 | size_t ielen = len - offsetof(struct ieee80211_mgmt, |
2302 | u.probe_resp.variable); | |
2303 | size_t new_ie_len; | |
2304 | struct cfg80211_bss_ies *new_ies; | |
2305 | const struct cfg80211_bss_ies *old; | |
aebe9f46 | 2306 | size_t cpy_len; |
0b8fb823 | 2307 | |
461c4c2b SS |
2308 | lockdep_assert_held(&wiphy_to_rdev(wiphy)->bss_lock); |
2309 | ||
0b8fb823 PX |
2310 | ie = mgmt->u.probe_resp.variable; |
2311 | ||
2312 | new_ie_len = ielen; | |
2313 | trans_ssid = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen); | |
2314 | if (!trans_ssid) | |
2315 | return; | |
2316 | new_ie_len -= trans_ssid[1]; | |
2317 | mbssid = cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen); | |
242b0931 JB |
2318 | /* |
2319 | * It's not valid to have the MBSSID element before SSID | |
2320 | * ignore if that happens - the code below assumes it is | |
2321 | * after (while copying things inbetween). | |
2322 | */ | |
2323 | if (!mbssid || mbssid < trans_ssid) | |
0b8fb823 PX |
2324 | return; |
2325 | new_ie_len -= mbssid[1]; | |
461c4c2b | 2326 | |
fb8b53ac | 2327 | nontrans_ssid = ieee80211_bss_get_elem(nontrans_bss, WLAN_EID_SSID); |
461c4c2b | 2328 | if (!nontrans_ssid) |
0b8fb823 | 2329 | return; |
461c4c2b | 2330 | |
fb8b53ac | 2331 | new_ie_len += nontrans_ssid->datalen; |
0b8fb823 PX |
2332 | |
2333 | /* generate new ie for nontrans BSS | |
2334 | * 1. replace SSID with nontrans BSS' SSID | |
2335 | * 2. skip MBSSID IE | |
2336 | */ | |
461c4c2b | 2337 | new_ie = kzalloc(new_ie_len, GFP_ATOMIC); |
0b8fb823 PX |
2338 | if (!new_ie) |
2339 | return; | |
461c4c2b SS |
2340 | |
2341 | new_ies = kzalloc(sizeof(*new_ies) + new_ie_len, GFP_ATOMIC); | |
bede8d29 SS |
2342 | if (!new_ies) |
2343 | goto out_free; | |
0b8fb823 PX |
2344 | |
2345 | pos = new_ie; | |
2346 | ||
2347 | /* copy the nontransmitted SSID */ | |
fb8b53ac | 2348 | cpy_len = nontrans_ssid->datalen + 2; |
0b8fb823 PX |
2349 | memcpy(pos, nontrans_ssid, cpy_len); |
2350 | pos += cpy_len; | |
2351 | /* copy the IEs between SSID and MBSSID */ | |
2352 | cpy_len = trans_ssid[1] + 2; | |
2353 | memcpy(pos, (trans_ssid + cpy_len), (mbssid - (trans_ssid + cpy_len))); | |
2354 | pos += (mbssid - (trans_ssid + cpy_len)); | |
2355 | /* copy the IEs after MBSSID */ | |
2356 | cpy_len = mbssid[1] + 2; | |
2357 | memcpy(pos, mbssid + cpy_len, ((ie + ielen) - (mbssid + cpy_len))); | |
2358 | ||
2359 | /* update ie */ | |
2360 | new_ies->len = new_ie_len; | |
2361 | new_ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); | |
2362 | new_ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control); | |
2363 | memcpy(new_ies->data, new_ie, new_ie_len); | |
2364 | if (ieee80211_is_probe_resp(mgmt->frame_control)) { | |
7011ba58 SS |
2365 | old = rcu_access_pointer(nontrans_bss->proberesp_ies); |
2366 | rcu_assign_pointer(nontrans_bss->proberesp_ies, new_ies); | |
2367 | rcu_assign_pointer(nontrans_bss->ies, new_ies); | |
0b8fb823 PX |
2368 | if (old) |
2369 | kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head); | |
2370 | } else { | |
7011ba58 SS |
2371 | old = rcu_access_pointer(nontrans_bss->beacon_ies); |
2372 | rcu_assign_pointer(nontrans_bss->beacon_ies, new_ies); | |
c90b93b5 JB |
2373 | cfg80211_update_hidden_bsses(bss_from_pub(nontrans_bss), |
2374 | new_ies, old); | |
7011ba58 | 2375 | rcu_assign_pointer(nontrans_bss->ies, new_ies); |
0b8fb823 PX |
2376 | if (old) |
2377 | kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head); | |
2378 | } | |
bede8d29 SS |
2379 | |
2380 | out_free: | |
2381 | kfree(new_ie); | |
0b8fb823 | 2382 | } |
6e19bc4b | 2383 | |
0b8fb823 PX |
2384 | /* cfg80211_inform_bss_width_frame helper */ |
2385 | static struct cfg80211_bss * | |
2386 | cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy, | |
2387 | struct cfg80211_inform_bss *data, | |
2388 | struct ieee80211_mgmt *mgmt, size_t len, | |
0b8fb823 | 2389 | gfp_t gfp) |
2a519311 | 2390 | { |
9caf0364 JB |
2391 | struct cfg80211_internal_bss tmp = {}, *res; |
2392 | struct cfg80211_bss_ies *ies; | |
3afc2167 | 2393 | struct ieee80211_channel *channel; |
67af9811 | 2394 | bool signal_valid; |
9eaffe50 TP |
2395 | struct ieee80211_ext *ext = NULL; |
2396 | u8 *bssid, *variable; | |
2397 | u16 capability, beacon_int; | |
2398 | size_t ielen, min_hdr_len = offsetof(struct ieee80211_mgmt, | |
2399 | u.probe_resp.variable); | |
6eb18137 | 2400 | int bss_type; |
7f599aec | 2401 | enum cfg80211_bss_frame_type ftype; |
bef9bacc | 2402 | |
0172bb75 JB |
2403 | BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) != |
2404 | offsetof(struct ieee80211_mgmt, u.beacon.variable)); | |
2405 | ||
6e19bc4b | 2406 | trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len); |
4ee3e063 | 2407 | |
bef9bacc MK |
2408 | if (WARN_ON(!mgmt)) |
2409 | return NULL; | |
2410 | ||
2411 | if (WARN_ON(!wiphy)) | |
2412 | return NULL; | |
2a519311 | 2413 | |
22fe88d3 | 2414 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
6e19bc4b | 2415 | (data->signal < 0 || data->signal > 100))) |
2a519311 JB |
2416 | return NULL; |
2417 | ||
9eaffe50 TP |
2418 | if (ieee80211_is_s1g_beacon(mgmt->frame_control)) { |
2419 | ext = (void *) mgmt; | |
2420 | min_hdr_len = offsetof(struct ieee80211_ext, u.s1g_beacon); | |
2421 | if (ieee80211_is_s1g_short_beacon(mgmt->frame_control)) | |
2422 | min_hdr_len = offsetof(struct ieee80211_ext, | |
2423 | u.s1g_short_beacon.variable); | |
2424 | } | |
2425 | ||
2426 | if (WARN_ON(len < min_hdr_len)) | |
2a519311 JB |
2427 | return NULL; |
2428 | ||
9eaffe50 TP |
2429 | ielen = len - min_hdr_len; |
2430 | variable = mgmt->u.probe_resp.variable; | |
2431 | if (ext) { | |
2432 | if (ieee80211_is_s1g_short_beacon(mgmt->frame_control)) | |
2433 | variable = ext->u.s1g_short_beacon.variable; | |
2434 | else | |
2435 | variable = ext->u.s1g_beacon.variable; | |
2436 | } | |
2437 | ||
7f599aec AB |
2438 | if (ieee80211_is_beacon(mgmt->frame_control)) |
2439 | ftype = CFG80211_BSS_FTYPE_BEACON; | |
2440 | else if (ieee80211_is_probe_resp(mgmt->frame_control)) | |
2441 | ftype = CFG80211_BSS_FTYPE_PRESP; | |
2442 | else | |
2443 | ftype = CFG80211_BSS_FTYPE_UNKNOWN; | |
2444 | ||
9eaffe50 | 2445 | channel = cfg80211_get_bss_channel(wiphy, variable, |
7f599aec AB |
2446 | ielen, data->chan, data->scan_width, |
2447 | ftype); | |
0172bb75 JB |
2448 | if (!channel) |
2449 | return NULL; | |
2450 | ||
9eaffe50 | 2451 | if (ext) { |
b5ac0146 JB |
2452 | const struct ieee80211_s1g_bcn_compat_ie *compat; |
2453 | const struct element *elem; | |
9eaffe50 | 2454 | |
b5ac0146 JB |
2455 | elem = cfg80211_find_elem(WLAN_EID_S1G_BCN_COMPAT, |
2456 | variable, ielen); | |
2457 | if (!elem) | |
2458 | return NULL; | |
2459 | if (elem->datalen < sizeof(*compat)) | |
9eaffe50 | 2460 | return NULL; |
b5ac0146 | 2461 | compat = (void *)elem->data; |
9eaffe50 TP |
2462 | bssid = ext->u.s1g_beacon.sa; |
2463 | capability = le16_to_cpu(compat->compat_info); | |
2464 | beacon_int = le16_to_cpu(compat->beacon_int); | |
2465 | } else { | |
2466 | bssid = mgmt->bssid; | |
2467 | beacon_int = le16_to_cpu(mgmt->u.probe_resp.beacon_int); | |
2468 | capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); | |
2469 | } | |
2470 | ||
0e227084 | 2471 | ies = kzalloc(sizeof(*ies) + ielen, gfp); |
9caf0364 | 2472 | if (!ies) |
2a519311 | 2473 | return NULL; |
9caf0364 | 2474 | ies->len = ielen; |
8cef2c9d | 2475 | ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); |
9eaffe50 TP |
2476 | ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control) || |
2477 | ieee80211_is_s1g_beacon(mgmt->frame_control); | |
2478 | memcpy(ies->data, variable, ielen); | |
2a519311 | 2479 | |
9caf0364 JB |
2480 | if (ieee80211_is_probe_resp(mgmt->frame_control)) |
2481 | rcu_assign_pointer(tmp.pub.proberesp_ies, ies); | |
2482 | else | |
2483 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); | |
2484 | rcu_assign_pointer(tmp.pub.ies, ies); | |
505a2e88 | 2485 | |
9eaffe50 TP |
2486 | memcpy(tmp.pub.bssid, bssid, ETH_ALEN); |
2487 | tmp.pub.beacon_interval = beacon_int; | |
2488 | tmp.pub.capability = capability; | |
9caf0364 | 2489 | tmp.pub.channel = channel; |
6e19bc4b DS |
2490 | tmp.pub.scan_width = data->scan_width; |
2491 | tmp.pub.signal = data->signal; | |
6e19bc4b | 2492 | tmp.ts_boottime = data->boottime_ns; |
1d76250b | 2493 | tmp.parent_tsf = data->parent_tsf; |
983dafaa SD |
2494 | tmp.pub.chains = data->chains; |
2495 | memcpy(tmp.pub.chain_signal, data->chain_signal, IEEE80211_MAX_CHAINS); | |
1d76250b | 2496 | ether_addr_copy(tmp.parent_bssid, data->parent_bssid); |
9caf0364 | 2497 | |
7bb106eb | 2498 | signal_valid = data->chan == channel; |
a3ce17d1 CT |
2499 | res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid, |
2500 | jiffies); | |
2a519311 JB |
2501 | if (!res) |
2502 | return NULL; | |
2503 | ||
57fbcce3 | 2504 | if (channel->band == NL80211_BAND_60GHZ) { |
6eb18137 DL |
2505 | bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK; |
2506 | if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP || | |
2507 | bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS) | |
2508 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
2509 | } else { | |
2510 | if (res->pub.capability & WLAN_CAPABILITY_ESS) | |
2511 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
2512 | } | |
e38f8a7a | 2513 | |
4ee3e063 | 2514 | trace_cfg80211_return_bss(&res->pub); |
2a519311 JB |
2515 | /* cfg80211_bss_update gives us a referenced result */ |
2516 | return &res->pub; | |
2517 | } | |
0b8fb823 PX |
2518 | |
2519 | struct cfg80211_bss * | |
2520 | cfg80211_inform_bss_frame_data(struct wiphy *wiphy, | |
2521 | struct cfg80211_inform_bss *data, | |
2522 | struct ieee80211_mgmt *mgmt, size_t len, | |
2523 | gfp_t gfp) | |
2524 | { | |
7011ba58 | 2525 | struct cfg80211_bss *res, *tmp_bss; |
0b8fb823 PX |
2526 | const u8 *ie = mgmt->u.probe_resp.variable; |
2527 | const struct cfg80211_bss_ies *ies1, *ies2; | |
2528 | size_t ielen = len - offsetof(struct ieee80211_mgmt, | |
2529 | u.probe_resp.variable); | |
acd3c92a | 2530 | struct cfg80211_non_tx_bss non_tx_data = {}; |
0b8fb823 PX |
2531 | |
2532 | res = cfg80211_inform_single_bss_frame_data(wiphy, data, mgmt, | |
84f1772b | 2533 | len, gfp); |
acd3c92a JB |
2534 | |
2535 | /* don't do any further MBSSID handling for S1G */ | |
2536 | if (ieee80211_is_s1g_beacon(mgmt->frame_control)) | |
2537 | return res; | |
2538 | ||
213ed579 | 2539 | if (!res || !wiphy->support_mbssid || |
a3eca817 | 2540 | !cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID, ie, ielen)) |
213ed579 SS |
2541 | return res; |
2542 | if (wiphy->support_only_he_mbssid && | |
a3eca817 | 2543 | !cfg80211_find_ext_elem(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen)) |
0b8fb823 PX |
2544 | return res; |
2545 | ||
0cd01efb | 2546 | non_tx_data.tx_bss = res; |
0b8fb823 | 2547 | /* process each non-transmitting bss */ |
0cd01efb SS |
2548 | cfg80211_parse_mbssid_frame_data(wiphy, data, mgmt, len, |
2549 | &non_tx_data, gfp); | |
0b8fb823 | 2550 | |
461c4c2b SS |
2551 | spin_lock_bh(&wiphy_to_rdev(wiphy)->bss_lock); |
2552 | ||
0b8fb823 PX |
2553 | /* check if the res has other nontransmitting bss which is not |
2554 | * in MBSSID IE | |
2555 | */ | |
2556 | ies1 = rcu_access_pointer(res->ies); | |
0b8fb823 PX |
2557 | |
2558 | /* go through nontrans_list, if the timestamp of the BSS is | |
2559 | * earlier than the timestamp of the transmitting BSS then | |
2560 | * update it | |
2561 | */ | |
7011ba58 | 2562 | list_for_each_entry(tmp_bss, &res->nontrans_list, |
0b8fb823 | 2563 | nontrans_list) { |
7011ba58 | 2564 | ies2 = rcu_access_pointer(tmp_bss->ies); |
0b8fb823 PX |
2565 | if (ies2->tsf < ies1->tsf) |
2566 | cfg80211_update_notlisted_nontrans(wiphy, tmp_bss, | |
461c4c2b | 2567 | mgmt, len); |
0b8fb823 | 2568 | } |
461c4c2b | 2569 | spin_unlock_bh(&wiphy_to_rdev(wiphy)->bss_lock); |
0b8fb823 PX |
2570 | |
2571 | return res; | |
2572 | } | |
6e19bc4b | 2573 | EXPORT_SYMBOL(cfg80211_inform_bss_frame_data); |
2a519311 | 2574 | |
5b112d3d | 2575 | void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
4c0c0b75 | 2576 | { |
f26cbf40 | 2577 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
4c0c0b75 JB |
2578 | struct cfg80211_internal_bss *bss; |
2579 | ||
2580 | if (!pub) | |
2581 | return; | |
2582 | ||
2583 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
776b3580 | 2584 | |
1b8ec87a ZG |
2585 | spin_lock_bh(&rdev->bss_lock); |
2586 | bss_ref_get(rdev, bss); | |
2587 | spin_unlock_bh(&rdev->bss_lock); | |
4c0c0b75 JB |
2588 | } |
2589 | EXPORT_SYMBOL(cfg80211_ref_bss); | |
2590 | ||
5b112d3d | 2591 | void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
2a519311 | 2592 | { |
f26cbf40 | 2593 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
2a519311 JB |
2594 | struct cfg80211_internal_bss *bss; |
2595 | ||
2596 | if (!pub) | |
2597 | return; | |
2598 | ||
2599 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
776b3580 | 2600 | |
1b8ec87a ZG |
2601 | spin_lock_bh(&rdev->bss_lock); |
2602 | bss_ref_put(rdev, bss); | |
2603 | spin_unlock_bh(&rdev->bss_lock); | |
2a519311 JB |
2604 | } |
2605 | EXPORT_SYMBOL(cfg80211_put_bss); | |
2606 | ||
d491af19 JB |
2607 | void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
2608 | { | |
f26cbf40 | 2609 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
7011ba58 SS |
2610 | struct cfg80211_internal_bss *bss, *tmp1; |
2611 | struct cfg80211_bss *nontrans_bss, *tmp; | |
d491af19 JB |
2612 | |
2613 | if (WARN_ON(!pub)) | |
2614 | return; | |
2615 | ||
2616 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
2617 | ||
1b8ec87a | 2618 | spin_lock_bh(&rdev->bss_lock); |
7011ba58 SS |
2619 | if (list_empty(&bss->list)) |
2620 | goto out; | |
2621 | ||
2622 | list_for_each_entry_safe(nontrans_bss, tmp, | |
2623 | &pub->nontrans_list, | |
2624 | nontrans_list) { | |
2625 | tmp1 = container_of(nontrans_bss, | |
2626 | struct cfg80211_internal_bss, pub); | |
2627 | if (__cfg80211_unlink_bss(rdev, tmp1)) | |
1b8ec87a | 2628 | rdev->bss_generation++; |
3207390a | 2629 | } |
7011ba58 SS |
2630 | |
2631 | if (__cfg80211_unlink_bss(rdev, bss)) | |
2632 | rdev->bss_generation++; | |
2633 | out: | |
1b8ec87a | 2634 | spin_unlock_bh(&rdev->bss_lock); |
d491af19 JB |
2635 | } |
2636 | EXPORT_SYMBOL(cfg80211_unlink_bss); | |
2637 | ||
4770c8f9 IP |
2638 | void cfg80211_bss_iter(struct wiphy *wiphy, |
2639 | struct cfg80211_chan_def *chandef, | |
2640 | void (*iter)(struct wiphy *wiphy, | |
2641 | struct cfg80211_bss *bss, | |
2642 | void *data), | |
2643 | void *iter_data) | |
2644 | { | |
2645 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); | |
2646 | struct cfg80211_internal_bss *bss; | |
2647 | ||
2648 | spin_lock_bh(&rdev->bss_lock); | |
2649 | ||
2650 | list_for_each_entry(bss, &rdev->bss_list, list) { | |
7b0a0e3c JB |
2651 | if (!chandef || cfg80211_is_sub_chan(chandef, bss->pub.channel, |
2652 | false)) | |
4770c8f9 IP |
2653 | iter(wiphy, &bss->pub, iter_data); |
2654 | } | |
2655 | ||
2656 | spin_unlock_bh(&rdev->bss_lock); | |
2657 | } | |
2658 | EXPORT_SYMBOL(cfg80211_bss_iter); | |
2659 | ||
0afd425b | 2660 | void cfg80211_update_assoc_bss_entry(struct wireless_dev *wdev, |
7b0a0e3c | 2661 | unsigned int link_id, |
0afd425b SM |
2662 | struct ieee80211_channel *chan) |
2663 | { | |
2664 | struct wiphy *wiphy = wdev->wiphy; | |
2665 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); | |
7b0a0e3c | 2666 | struct cfg80211_internal_bss *cbss = wdev->links[link_id].client.current_bss; |
0afd425b SM |
2667 | struct cfg80211_internal_bss *new = NULL; |
2668 | struct cfg80211_internal_bss *bss; | |
2669 | struct cfg80211_bss *nontrans_bss; | |
2670 | struct cfg80211_bss *tmp; | |
2671 | ||
2672 | spin_lock_bh(&rdev->bss_lock); | |
2673 | ||
05dcb8bb IP |
2674 | /* |
2675 | * Some APs use CSA also for bandwidth changes, i.e., without actually | |
2676 | * changing the control channel, so no need to update in such a case. | |
2677 | */ | |
2678 | if (cbss->pub.channel == chan) | |
0afd425b SM |
2679 | goto done; |
2680 | ||
2681 | /* use transmitting bss */ | |
2682 | if (cbss->pub.transmitted_bss) | |
2683 | cbss = container_of(cbss->pub.transmitted_bss, | |
2684 | struct cfg80211_internal_bss, | |
2685 | pub); | |
2686 | ||
2687 | cbss->pub.channel = chan; | |
2688 | ||
2689 | list_for_each_entry(bss, &rdev->bss_list, list) { | |
2690 | if (!cfg80211_bss_type_match(bss->pub.capability, | |
2691 | bss->pub.channel->band, | |
2692 | wdev->conn_bss_type)) | |
2693 | continue; | |
2694 | ||
2695 | if (bss == cbss) | |
2696 | continue; | |
2697 | ||
2698 | if (!cmp_bss(&bss->pub, &cbss->pub, BSS_CMP_REGULAR)) { | |
2699 | new = bss; | |
2700 | break; | |
2701 | } | |
2702 | } | |
2703 | ||
2704 | if (new) { | |
2705 | /* to save time, update IEs for transmitting bss only */ | |
2706 | if (cfg80211_update_known_bss(rdev, cbss, new, false)) { | |
2707 | new->pub.proberesp_ies = NULL; | |
2708 | new->pub.beacon_ies = NULL; | |
2709 | } | |
2710 | ||
2711 | list_for_each_entry_safe(nontrans_bss, tmp, | |
2712 | &new->pub.nontrans_list, | |
2713 | nontrans_list) { | |
2714 | bss = container_of(nontrans_bss, | |
2715 | struct cfg80211_internal_bss, pub); | |
2716 | if (__cfg80211_unlink_bss(rdev, bss)) | |
2717 | rdev->bss_generation++; | |
2718 | } | |
2719 | ||
2720 | WARN_ON(atomic_read(&new->hold)); | |
2721 | if (!WARN_ON(!__cfg80211_unlink_bss(rdev, new))) | |
2722 | rdev->bss_generation++; | |
2723 | } | |
2724 | ||
2725 | rb_erase(&cbss->rbn, &rdev->bss_tree); | |
2726 | rb_insert_bss(rdev, cbss); | |
2727 | rdev->bss_generation++; | |
2728 | ||
2729 | list_for_each_entry_safe(nontrans_bss, tmp, | |
2730 | &cbss->pub.nontrans_list, | |
2731 | nontrans_list) { | |
2732 | bss = container_of(nontrans_bss, | |
2733 | struct cfg80211_internal_bss, pub); | |
2734 | bss->pub.channel = chan; | |
2735 | rb_erase(&bss->rbn, &rdev->bss_tree); | |
2736 | rb_insert_bss(rdev, bss); | |
2737 | rdev->bss_generation++; | |
2738 | } | |
2739 | ||
2740 | done: | |
2741 | spin_unlock_bh(&rdev->bss_lock); | |
2742 | } | |
2743 | ||
3d23e349 | 2744 | #ifdef CONFIG_CFG80211_WEXT |
9f419f38 JB |
2745 | static struct cfg80211_registered_device * |
2746 | cfg80211_get_dev_from_ifindex(struct net *net, int ifindex) | |
2747 | { | |
5fe231e8 | 2748 | struct cfg80211_registered_device *rdev; |
9f419f38 JB |
2749 | struct net_device *dev; |
2750 | ||
5fe231e8 JB |
2751 | ASSERT_RTNL(); |
2752 | ||
9f419f38 JB |
2753 | dev = dev_get_by_index(net, ifindex); |
2754 | if (!dev) | |
5fe231e8 JB |
2755 | return ERR_PTR(-ENODEV); |
2756 | if (dev->ieee80211_ptr) | |
f26cbf40 | 2757 | rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy); |
5fe231e8 | 2758 | else |
9f419f38 JB |
2759 | rdev = ERR_PTR(-ENODEV); |
2760 | dev_put(dev); | |
9f419f38 JB |
2761 | return rdev; |
2762 | } | |
2763 | ||
2a519311 JB |
2764 | int cfg80211_wext_siwscan(struct net_device *dev, |
2765 | struct iw_request_info *info, | |
2766 | union iwreq_data *wrqu, char *extra) | |
2767 | { | |
2768 | struct cfg80211_registered_device *rdev; | |
2769 | struct wiphy *wiphy; | |
2770 | struct iw_scan_req *wreq = NULL; | |
3536672b | 2771 | struct cfg80211_scan_request *creq; |
2a519311 | 2772 | int i, err, n_channels = 0; |
57fbcce3 | 2773 | enum nl80211_band band; |
2a519311 JB |
2774 | |
2775 | if (!netif_running(dev)) | |
2776 | return -ENETDOWN; | |
2777 | ||
b2e3abdc HS |
2778 | if (wrqu->data.length == sizeof(struct iw_scan_req)) |
2779 | wreq = (struct iw_scan_req *)extra; | |
2780 | ||
463d0183 | 2781 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
2782 | |
2783 | if (IS_ERR(rdev)) | |
2784 | return PTR_ERR(rdev); | |
2785 | ||
3536672b | 2786 | if (rdev->scan_req || rdev->scan_msg) |
2787 | return -EBUSY; | |
2a519311 JB |
2788 | |
2789 | wiphy = &rdev->wiphy; | |
2790 | ||
b2e3abdc HS |
2791 | /* Determine number of channels, needed to allocate creq */ |
2792 | if (wreq && wreq->num_channels) | |
2793 | n_channels = wreq->num_channels; | |
bdfbec2d IP |
2794 | else |
2795 | n_channels = ieee80211_get_num_supported_channels(wiphy); | |
2a519311 JB |
2796 | |
2797 | creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + | |
2798 | n_channels * sizeof(void *), | |
2799 | GFP_ATOMIC); | |
3536672b | 2800 | if (!creq) |
2801 | return -ENOMEM; | |
2a519311 JB |
2802 | |
2803 | creq->wiphy = wiphy; | |
fd014284 | 2804 | creq->wdev = dev->ieee80211_ptr; |
5ba63533 JB |
2805 | /* SSIDs come after channels */ |
2806 | creq->ssids = (void *)&creq->channels[n_channels]; | |
2a519311 JB |
2807 | creq->n_channels = n_channels; |
2808 | creq->n_ssids = 1; | |
15d6030b | 2809 | creq->scan_start = jiffies; |
2a519311 | 2810 | |
b2e3abdc | 2811 | /* translate "Scan on frequencies" request */ |
2a519311 | 2812 | i = 0; |
57fbcce3 | 2813 | for (band = 0; band < NUM_NL80211_BANDS; band++) { |
2a519311 | 2814 | int j; |
584991dc | 2815 | |
2a519311 JB |
2816 | if (!wiphy->bands[band]) |
2817 | continue; | |
584991dc | 2818 | |
2a519311 | 2819 | for (j = 0; j < wiphy->bands[band]->n_channels; j++) { |
584991dc JB |
2820 | /* ignore disabled channels */ |
2821 | if (wiphy->bands[band]->channels[j].flags & | |
2822 | IEEE80211_CHAN_DISABLED) | |
2823 | continue; | |
b2e3abdc HS |
2824 | |
2825 | /* If we have a wireless request structure and the | |
2826 | * wireless request specifies frequencies, then search | |
2827 | * for the matching hardware channel. | |
2828 | */ | |
2829 | if (wreq && wreq->num_channels) { | |
2830 | int k; | |
2831 | int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; | |
2832 | for (k = 0; k < wreq->num_channels; k++) { | |
96998e3a ZG |
2833 | struct iw_freq *freq = |
2834 | &wreq->channel_list[k]; | |
2835 | int wext_freq = | |
2836 | cfg80211_wext_freq(freq); | |
2837 | ||
b2e3abdc HS |
2838 | if (wext_freq == wiphy_freq) |
2839 | goto wext_freq_found; | |
2840 | } | |
2841 | goto wext_freq_not_found; | |
2842 | } | |
2843 | ||
2844 | wext_freq_found: | |
2a519311 JB |
2845 | creq->channels[i] = &wiphy->bands[band]->channels[j]; |
2846 | i++; | |
b2e3abdc | 2847 | wext_freq_not_found: ; |
2a519311 JB |
2848 | } |
2849 | } | |
8862dc5f HS |
2850 | /* No channels found? */ |
2851 | if (!i) { | |
2852 | err = -EINVAL; | |
2853 | goto out; | |
2854 | } | |
2a519311 | 2855 | |
b2e3abdc HS |
2856 | /* Set real number of channels specified in creq->channels[] */ |
2857 | creq->n_channels = i; | |
2a519311 | 2858 | |
b2e3abdc HS |
2859 | /* translate "Scan for SSID" request */ |
2860 | if (wreq) { | |
2a519311 | 2861 | if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { |
65486c8b JB |
2862 | if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { |
2863 | err = -EINVAL; | |
2864 | goto out; | |
2865 | } | |
2a519311 JB |
2866 | memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); |
2867 | creq->ssids[0].ssid_len = wreq->essid_len; | |
2868 | } | |
2869 | if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) | |
2870 | creq->n_ssids = 0; | |
2871 | } | |
2872 | ||
57fbcce3 | 2873 | for (i = 0; i < NUM_NL80211_BANDS; i++) |
a401d2bb JB |
2874 | if (wiphy->bands[i]) |
2875 | creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1; | |
34850ab2 | 2876 | |
818965d3 JM |
2877 | eth_broadcast_addr(creq->bssid); |
2878 | ||
a05829a7 JB |
2879 | wiphy_lock(&rdev->wiphy); |
2880 | ||
2a519311 | 2881 | rdev->scan_req = creq; |
e35e4d28 | 2882 | err = rdev_scan(rdev, creq); |
2a519311 JB |
2883 | if (err) { |
2884 | rdev->scan_req = NULL; | |
65486c8b | 2885 | /* creq will be freed below */ |
463d0183 | 2886 | } else { |
fd014284 | 2887 | nl80211_send_scan_start(rdev, dev->ieee80211_ptr); |
65486c8b JB |
2888 | /* creq now owned by driver */ |
2889 | creq = NULL; | |
463d0183 JB |
2890 | dev_hold(dev); |
2891 | } | |
a05829a7 | 2892 | wiphy_unlock(&rdev->wiphy); |
2a519311 | 2893 | out: |
65486c8b | 2894 | kfree(creq); |
2a519311 JB |
2895 | return err; |
2896 | } | |
2afe38d1 | 2897 | EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan); |
2a519311 | 2898 | |
76a70e9c JM |
2899 | static char *ieee80211_scan_add_ies(struct iw_request_info *info, |
2900 | const struct cfg80211_bss_ies *ies, | |
2901 | char *current_ev, char *end_buf) | |
2a519311 | 2902 | { |
9caf0364 | 2903 | const u8 *pos, *end, *next; |
2a519311 JB |
2904 | struct iw_event iwe; |
2905 | ||
9caf0364 | 2906 | if (!ies) |
76a70e9c | 2907 | return current_ev; |
2a519311 JB |
2908 | |
2909 | /* | |
2910 | * If needed, fragment the IEs buffer (at IE boundaries) into short | |
2911 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. | |
2912 | */ | |
9caf0364 JB |
2913 | pos = ies->data; |
2914 | end = pos + ies->len; | |
2a519311 JB |
2915 | |
2916 | while (end - pos > IW_GENERIC_IE_MAX) { | |
2917 | next = pos + 2 + pos[1]; | |
2918 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) | |
2919 | next = next + 2 + next[1]; | |
2920 | ||
2921 | memset(&iwe, 0, sizeof(iwe)); | |
2922 | iwe.cmd = IWEVGENIE; | |
2923 | iwe.u.data.length = next - pos; | |
76a70e9c JM |
2924 | current_ev = iwe_stream_add_point_check(info, current_ev, |
2925 | end_buf, &iwe, | |
2926 | (void *)pos); | |
2927 | if (IS_ERR(current_ev)) | |
2928 | return current_ev; | |
2a519311 JB |
2929 | pos = next; |
2930 | } | |
2931 | ||
2932 | if (end > pos) { | |
2933 | memset(&iwe, 0, sizeof(iwe)); | |
2934 | iwe.cmd = IWEVGENIE; | |
2935 | iwe.u.data.length = end - pos; | |
76a70e9c JM |
2936 | current_ev = iwe_stream_add_point_check(info, current_ev, |
2937 | end_buf, &iwe, | |
2938 | (void *)pos); | |
2939 | if (IS_ERR(current_ev)) | |
2940 | return current_ev; | |
2a519311 | 2941 | } |
76a70e9c JM |
2942 | |
2943 | return current_ev; | |
2a519311 JB |
2944 | } |
2945 | ||
2a519311 | 2946 | static char * |
77965c97 JB |
2947 | ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, |
2948 | struct cfg80211_internal_bss *bss, char *current_ev, | |
2949 | char *end_buf) | |
2a519311 | 2950 | { |
9caf0364 | 2951 | const struct cfg80211_bss_ies *ies; |
2a519311 | 2952 | struct iw_event iwe; |
9caf0364 | 2953 | const u8 *ie; |
76a70e9c JM |
2954 | u8 buf[50]; |
2955 | u8 *cfg, *p, *tmp; | |
9caf0364 | 2956 | int rem, i, sig; |
2a519311 JB |
2957 | bool ismesh = false; |
2958 | ||
2959 | memset(&iwe, 0, sizeof(iwe)); | |
2960 | iwe.cmd = SIOCGIWAP; | |
2961 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; | |
2962 | memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); | |
76a70e9c JM |
2963 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
2964 | IW_EV_ADDR_LEN); | |
2965 | if (IS_ERR(current_ev)) | |
2966 | return current_ev; | |
2a519311 JB |
2967 | |
2968 | memset(&iwe, 0, sizeof(iwe)); | |
2969 | iwe.cmd = SIOCGIWFREQ; | |
2970 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); | |
2971 | iwe.u.freq.e = 0; | |
76a70e9c JM |
2972 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
2973 | IW_EV_FREQ_LEN); | |
2974 | if (IS_ERR(current_ev)) | |
2975 | return current_ev; | |
2a519311 JB |
2976 | |
2977 | memset(&iwe, 0, sizeof(iwe)); | |
2978 | iwe.cmd = SIOCGIWFREQ; | |
2979 | iwe.u.freq.m = bss->pub.channel->center_freq; | |
2980 | iwe.u.freq.e = 6; | |
76a70e9c JM |
2981 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
2982 | IW_EV_FREQ_LEN); | |
2983 | if (IS_ERR(current_ev)) | |
2984 | return current_ev; | |
2a519311 | 2985 | |
77965c97 | 2986 | if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { |
2a519311 JB |
2987 | memset(&iwe, 0, sizeof(iwe)); |
2988 | iwe.cmd = IWEVQUAL; | |
2989 | iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | | |
2990 | IW_QUAL_NOISE_INVALID | | |
a77b8552 | 2991 | IW_QUAL_QUAL_UPDATED; |
77965c97 | 2992 | switch (wiphy->signal_type) { |
2a519311 | 2993 | case CFG80211_SIGNAL_TYPE_MBM: |
a77b8552 JB |
2994 | sig = bss->pub.signal / 100; |
2995 | iwe.u.qual.level = sig; | |
2a519311 | 2996 | iwe.u.qual.updated |= IW_QUAL_DBM; |
a77b8552 JB |
2997 | if (sig < -110) /* rather bad */ |
2998 | sig = -110; | |
2999 | else if (sig > -40) /* perfect */ | |
3000 | sig = -40; | |
3001 | /* will give a range of 0 .. 70 */ | |
3002 | iwe.u.qual.qual = sig + 110; | |
2a519311 JB |
3003 | break; |
3004 | case CFG80211_SIGNAL_TYPE_UNSPEC: | |
3005 | iwe.u.qual.level = bss->pub.signal; | |
a77b8552 JB |
3006 | /* will give range 0 .. 100 */ |
3007 | iwe.u.qual.qual = bss->pub.signal; | |
2a519311 JB |
3008 | break; |
3009 | default: | |
3010 | /* not reached */ | |
3011 | break; | |
3012 | } | |
76a70e9c JM |
3013 | current_ev = iwe_stream_add_event_check(info, current_ev, |
3014 | end_buf, &iwe, | |
3015 | IW_EV_QUAL_LEN); | |
3016 | if (IS_ERR(current_ev)) | |
3017 | return current_ev; | |
2a519311 JB |
3018 | } |
3019 | ||
3020 | memset(&iwe, 0, sizeof(iwe)); | |
3021 | iwe.cmd = SIOCGIWENCODE; | |
3022 | if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) | |
3023 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; | |
3024 | else | |
3025 | iwe.u.data.flags = IW_ENCODE_DISABLED; | |
3026 | iwe.u.data.length = 0; | |
76a70e9c JM |
3027 | current_ev = iwe_stream_add_point_check(info, current_ev, end_buf, |
3028 | &iwe, ""); | |
3029 | if (IS_ERR(current_ev)) | |
3030 | return current_ev; | |
2a519311 | 3031 | |
9caf0364 JB |
3032 | rcu_read_lock(); |
3033 | ies = rcu_dereference(bss->pub.ies); | |
83c7aa1a JB |
3034 | rem = ies->len; |
3035 | ie = ies->data; | |
9caf0364 | 3036 | |
83c7aa1a | 3037 | while (rem >= 2) { |
2a519311 JB |
3038 | /* invalid data */ |
3039 | if (ie[1] > rem - 2) | |
3040 | break; | |
3041 | ||
3042 | switch (ie[0]) { | |
3043 | case WLAN_EID_SSID: | |
3044 | memset(&iwe, 0, sizeof(iwe)); | |
3045 | iwe.cmd = SIOCGIWESSID; | |
3046 | iwe.u.data.length = ie[1]; | |
3047 | iwe.u.data.flags = 1; | |
76a70e9c JM |
3048 | current_ev = iwe_stream_add_point_check(info, |
3049 | current_ev, | |
3050 | end_buf, &iwe, | |
3051 | (u8 *)ie + 2); | |
3052 | if (IS_ERR(current_ev)) | |
3053 | goto unlock; | |
2a519311 JB |
3054 | break; |
3055 | case WLAN_EID_MESH_ID: | |
3056 | memset(&iwe, 0, sizeof(iwe)); | |
3057 | iwe.cmd = SIOCGIWESSID; | |
3058 | iwe.u.data.length = ie[1]; | |
3059 | iwe.u.data.flags = 1; | |
76a70e9c JM |
3060 | current_ev = iwe_stream_add_point_check(info, |
3061 | current_ev, | |
3062 | end_buf, &iwe, | |
3063 | (u8 *)ie + 2); | |
3064 | if (IS_ERR(current_ev)) | |
3065 | goto unlock; | |
2a519311 JB |
3066 | break; |
3067 | case WLAN_EID_MESH_CONFIG: | |
3068 | ismesh = true; | |
136cfa28 | 3069 | if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) |
2a519311 | 3070 | break; |
9caf0364 | 3071 | cfg = (u8 *)ie + 2; |
2a519311 JB |
3072 | memset(&iwe, 0, sizeof(iwe)); |
3073 | iwe.cmd = IWEVCUSTOM; | |
76aa5e70 RP |
3074 | sprintf(buf, "Mesh Network Path Selection Protocol ID: " |
3075 | "0x%02X", cfg[0]); | |
2a519311 | 3076 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
3077 | current_ev = iwe_stream_add_point_check(info, |
3078 | current_ev, | |
3079 | end_buf, | |
3080 | &iwe, buf); | |
3081 | if (IS_ERR(current_ev)) | |
3082 | goto unlock; | |
76aa5e70 RP |
3083 | sprintf(buf, "Path Selection Metric ID: 0x%02X", |
3084 | cfg[1]); | |
2a519311 | 3085 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
3086 | current_ev = iwe_stream_add_point_check(info, |
3087 | current_ev, | |
3088 | end_buf, | |
3089 | &iwe, buf); | |
3090 | if (IS_ERR(current_ev)) | |
3091 | goto unlock; | |
76aa5e70 RP |
3092 | sprintf(buf, "Congestion Control Mode ID: 0x%02X", |
3093 | cfg[2]); | |
2a519311 | 3094 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
3095 | current_ev = iwe_stream_add_point_check(info, |
3096 | current_ev, | |
3097 | end_buf, | |
3098 | &iwe, buf); | |
3099 | if (IS_ERR(current_ev)) | |
3100 | goto unlock; | |
76aa5e70 | 3101 | sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]); |
2a519311 | 3102 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
3103 | current_ev = iwe_stream_add_point_check(info, |
3104 | current_ev, | |
3105 | end_buf, | |
3106 | &iwe, buf); | |
3107 | if (IS_ERR(current_ev)) | |
3108 | goto unlock; | |
76aa5e70 RP |
3109 | sprintf(buf, "Authentication ID: 0x%02X", cfg[4]); |
3110 | iwe.u.data.length = strlen(buf); | |
76a70e9c JM |
3111 | current_ev = iwe_stream_add_point_check(info, |
3112 | current_ev, | |
3113 | end_buf, | |
3114 | &iwe, buf); | |
3115 | if (IS_ERR(current_ev)) | |
3116 | goto unlock; | |
76aa5e70 RP |
3117 | sprintf(buf, "Formation Info: 0x%02X", cfg[5]); |
3118 | iwe.u.data.length = strlen(buf); | |
76a70e9c JM |
3119 | current_ev = iwe_stream_add_point_check(info, |
3120 | current_ev, | |
3121 | end_buf, | |
3122 | &iwe, buf); | |
3123 | if (IS_ERR(current_ev)) | |
3124 | goto unlock; | |
76aa5e70 | 3125 | sprintf(buf, "Capabilities: 0x%02X", cfg[6]); |
2a519311 | 3126 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
3127 | current_ev = iwe_stream_add_point_check(info, |
3128 | current_ev, | |
3129 | end_buf, | |
3130 | &iwe, buf); | |
3131 | if (IS_ERR(current_ev)) | |
3132 | goto unlock; | |
2a519311 JB |
3133 | break; |
3134 | case WLAN_EID_SUPP_RATES: | |
3135 | case WLAN_EID_EXT_SUPP_RATES: | |
3136 | /* display all supported rates in readable format */ | |
3137 | p = current_ev + iwe_stream_lcp_len(info); | |
3138 | ||
3139 | memset(&iwe, 0, sizeof(iwe)); | |
3140 | iwe.cmd = SIOCGIWRATE; | |
3141 | /* Those two flags are ignored... */ | |
3142 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; | |
3143 | ||
3144 | for (i = 0; i < ie[1]; i++) { | |
3145 | iwe.u.bitrate.value = | |
3146 | ((ie[i + 2] & 0x7f) * 500000); | |
76a70e9c | 3147 | tmp = p; |
2a519311 | 3148 | p = iwe_stream_add_value(info, current_ev, p, |
76a70e9c JM |
3149 | end_buf, &iwe, |
3150 | IW_EV_PARAM_LEN); | |
3151 | if (p == tmp) { | |
3152 | current_ev = ERR_PTR(-E2BIG); | |
3153 | goto unlock; | |
3154 | } | |
2a519311 JB |
3155 | } |
3156 | current_ev = p; | |
3157 | break; | |
3158 | } | |
3159 | rem -= ie[1] + 2; | |
3160 | ie += ie[1] + 2; | |
3161 | } | |
3162 | ||
f64f9e71 JP |
3163 | if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || |
3164 | ismesh) { | |
2a519311 JB |
3165 | memset(&iwe, 0, sizeof(iwe)); |
3166 | iwe.cmd = SIOCGIWMODE; | |
3167 | if (ismesh) | |
3168 | iwe.u.mode = IW_MODE_MESH; | |
3169 | else if (bss->pub.capability & WLAN_CAPABILITY_ESS) | |
3170 | iwe.u.mode = IW_MODE_MASTER; | |
3171 | else | |
3172 | iwe.u.mode = IW_MODE_ADHOC; | |
76a70e9c JM |
3173 | current_ev = iwe_stream_add_event_check(info, current_ev, |
3174 | end_buf, &iwe, | |
3175 | IW_EV_UINT_LEN); | |
3176 | if (IS_ERR(current_ev)) | |
3177 | goto unlock; | |
2a519311 JB |
3178 | } |
3179 | ||
76a70e9c JM |
3180 | memset(&iwe, 0, sizeof(iwe)); |
3181 | iwe.cmd = IWEVCUSTOM; | |
3182 | sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf)); | |
3183 | iwe.u.data.length = strlen(buf); | |
3184 | current_ev = iwe_stream_add_point_check(info, current_ev, end_buf, | |
3185 | &iwe, buf); | |
3186 | if (IS_ERR(current_ev)) | |
3187 | goto unlock; | |
3188 | memset(&iwe, 0, sizeof(iwe)); | |
3189 | iwe.cmd = IWEVCUSTOM; | |
3190 | sprintf(buf, " Last beacon: %ums ago", | |
3191 | elapsed_jiffies_msecs(bss->ts)); | |
3192 | iwe.u.data.length = strlen(buf); | |
3193 | current_ev = iwe_stream_add_point_check(info, current_ev, | |
3194 | end_buf, &iwe, buf); | |
3195 | if (IS_ERR(current_ev)) | |
3196 | goto unlock; | |
3197 | ||
3198 | current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf); | |
3199 | ||
3200 | unlock: | |
9caf0364 | 3201 | rcu_read_unlock(); |
2a519311 JB |
3202 | return current_ev; |
3203 | } | |
3204 | ||
3205 | ||
1b8ec87a | 3206 | static int ieee80211_scan_results(struct cfg80211_registered_device *rdev, |
2a519311 JB |
3207 | struct iw_request_info *info, |
3208 | char *buf, size_t len) | |
3209 | { | |
3210 | char *current_ev = buf; | |
3211 | char *end_buf = buf + len; | |
3212 | struct cfg80211_internal_bss *bss; | |
76a70e9c | 3213 | int err = 0; |
2a519311 | 3214 | |
1b8ec87a ZG |
3215 | spin_lock_bh(&rdev->bss_lock); |
3216 | cfg80211_bss_expire(rdev); | |
2a519311 | 3217 | |
1b8ec87a | 3218 | list_for_each_entry(bss, &rdev->bss_list, list) { |
2a519311 | 3219 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { |
76a70e9c JM |
3220 | err = -E2BIG; |
3221 | break; | |
2a519311 | 3222 | } |
1b8ec87a | 3223 | current_ev = ieee80211_bss(&rdev->wiphy, info, bss, |
77965c97 | 3224 | current_ev, end_buf); |
76a70e9c JM |
3225 | if (IS_ERR(current_ev)) { |
3226 | err = PTR_ERR(current_ev); | |
3227 | break; | |
3228 | } | |
2a519311 | 3229 | } |
1b8ec87a | 3230 | spin_unlock_bh(&rdev->bss_lock); |
76a70e9c JM |
3231 | |
3232 | if (err) | |
3233 | return err; | |
2a519311 JB |
3234 | return current_ev - buf; |
3235 | } | |
3236 | ||
3237 | ||
3238 | int cfg80211_wext_giwscan(struct net_device *dev, | |
3239 | struct iw_request_info *info, | |
3240 | struct iw_point *data, char *extra) | |
3241 | { | |
3242 | struct cfg80211_registered_device *rdev; | |
3243 | int res; | |
3244 | ||
3245 | if (!netif_running(dev)) | |
3246 | return -ENETDOWN; | |
3247 | ||
463d0183 | 3248 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
3249 | |
3250 | if (IS_ERR(rdev)) | |
3251 | return PTR_ERR(rdev); | |
3252 | ||
f9d15d16 | 3253 | if (rdev->scan_req || rdev->scan_msg) |
5fe231e8 | 3254 | return -EAGAIN; |
2a519311 JB |
3255 | |
3256 | res = ieee80211_scan_results(rdev, info, extra, data->length); | |
3257 | data->length = 0; | |
3258 | if (res >= 0) { | |
3259 | data->length = res; | |
3260 | res = 0; | |
3261 | } | |
3262 | ||
2a519311 JB |
3263 | return res; |
3264 | } | |
2afe38d1 | 3265 | EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan); |
2a519311 | 3266 | #endif |