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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 |
52bb2052 | 8 | * Copyright (C) 2018-2021 Intel Corporation |
2a519311 JB |
9 | */ |
10 | #include <linux/kernel.h> | |
5a0e3ad6 | 11 | #include <linux/slab.h> |
2a519311 JB |
12 | #include <linux/module.h> |
13 | #include <linux/netdevice.h> | |
14 | #include <linux/wireless.h> | |
15 | #include <linux/nl80211.h> | |
16 | #include <linux/etherdevice.h> | |
c8cb5b85 TM |
17 | #include <linux/crc32.h> |
18 | #include <linux/bitfield.h> | |
2a519311 JB |
19 | #include <net/arp.h> |
20 | #include <net/cfg80211.h> | |
262eb9b2 | 21 | #include <net/cfg80211-wext.h> |
2a519311 JB |
22 | #include <net/iw_handler.h> |
23 | #include "core.h" | |
24 | #include "nl80211.h" | |
a9a11622 | 25 | #include "wext-compat.h" |
e35e4d28 | 26 | #include "rdev-ops.h" |
2a519311 | 27 | |
776b3580 JB |
28 | /** |
29 | * DOC: BSS tree/list structure | |
30 | * | |
31 | * At the top level, the BSS list is kept in both a list in each | |
32 | * registered device (@bss_list) as well as an RB-tree for faster | |
33 | * lookup. In the RB-tree, entries can be looked up using their | |
34 | * channel, MESHID, MESHCONF (for MBSSes) or channel, BSSID, SSID | |
35 | * for other BSSes. | |
36 | * | |
37 | * Due to the possibility of hidden SSIDs, there's a second level | |
38 | * structure, the "hidden_list" and "hidden_beacon_bss" pointer. | |
39 | * The hidden_list connects all BSSes belonging to a single AP | |
40 | * that has a hidden SSID, and connects beacon and probe response | |
41 | * entries. For a probe response entry for a hidden SSID, the | |
42 | * hidden_beacon_bss pointer points to the BSS struct holding the | |
43 | * beacon's information. | |
44 | * | |
45 | * Reference counting is done for all these references except for | |
46 | * the hidden_list, so that a beacon BSS struct that is otherwise | |
47 | * not referenced has one reference for being on the bss_list and | |
48 | * one for each probe response entry that points to it using the | |
49 | * hidden_beacon_bss pointer. When a BSS struct that has such a | |
50 | * pointer is get/put, the refcount update is also propagated to | |
51 | * the referenced struct, this ensure that it cannot get removed | |
52 | * while somebody is using the probe response version. | |
53 | * | |
54 | * Note that the hidden_beacon_bss pointer never changes, due to | |
55 | * the reference counting. Therefore, no locking is needed for | |
56 | * it. | |
57 | * | |
58 | * Also note that the hidden_beacon_bss pointer is only relevant | |
59 | * if the driver uses something other than the IEs, e.g. private | |
8cf5c86d | 60 | * data stored in the BSS struct, since the beacon IEs are |
776b3580 JB |
61 | * also linked into the probe response struct. |
62 | */ | |
63 | ||
9853a55e JB |
64 | /* |
65 | * Limit the number of BSS entries stored in mac80211. Each one is | |
66 | * a bit over 4k at most, so this limits to roughly 4-5M of memory. | |
67 | * If somebody wants to really attack this though, they'd likely | |
68 | * use small beacons, and only one type of frame, limiting each of | |
69 | * the entries to a much smaller size (in order to generate more | |
70 | * entries in total, so overhead is bigger.) | |
71 | */ | |
72 | static int bss_entries_limit = 1000; | |
73 | module_param(bss_entries_limit, int, 0644); | |
74 | MODULE_PARM_DESC(bss_entries_limit, | |
75 | "limit to number of scan BSS entries (per wiphy, default 1000)"); | |
76 | ||
f9616e0f | 77 | #define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ) |
2a519311 | 78 | |
c8cb5b85 TM |
79 | /** |
80 | * struct cfg80211_colocated_ap - colocated AP information | |
81 | * | |
82 | * @list: linked list to all colocated aPS | |
83 | * @bssid: BSSID of the reported AP | |
84 | * @ssid: SSID of the reported AP | |
85 | * @ssid_len: length of the ssid | |
86 | * @center_freq: frequency the reported AP is on | |
87 | * @unsolicited_probe: the reported AP is part of an ESS, where all the APs | |
88 | * that operate in the same channel as the reported AP and that might be | |
89 | * detected by a STA receiving this frame, are transmitting unsolicited | |
90 | * Probe Response frames every 20 TUs | |
91 | * @oct_recommended: OCT is recommended to exchange MMPDUs with the reported AP | |
92 | * @same_ssid: the reported AP has the same SSID as the reporting AP | |
93 | * @multi_bss: the reported AP is part of a multiple BSSID set | |
94 | * @transmitted_bssid: the reported AP is the transmitting BSSID | |
95 | * @colocated_ess: all the APs that share the same ESS as the reported AP are | |
96 | * colocated and can be discovered via legacy bands. | |
97 | * @short_ssid_valid: short_ssid is valid and can be used | |
98 | * @short_ssid: the short SSID for this SSID | |
99 | */ | |
100 | struct cfg80211_colocated_ap { | |
101 | struct list_head list; | |
102 | u8 bssid[ETH_ALEN]; | |
103 | u8 ssid[IEEE80211_MAX_SSID_LEN]; | |
104 | size_t ssid_len; | |
105 | u32 short_ssid; | |
106 | u32 center_freq; | |
107 | u8 unsolicited_probe:1, | |
108 | oct_recommended:1, | |
109 | same_ssid:1, | |
110 | multi_bss:1, | |
111 | transmitted_bssid:1, | |
112 | colocated_ess:1, | |
113 | short_ssid_valid:1; | |
114 | }; | |
115 | ||
776b3580 | 116 | static void bss_free(struct cfg80211_internal_bss *bss) |
e8e27c66 | 117 | { |
9caf0364 | 118 | struct cfg80211_bss_ies *ies; |
b629ea3d JB |
119 | |
120 | if (WARN_ON(atomic_read(&bss->hold))) | |
121 | return; | |
122 | ||
9caf0364 | 123 | ies = (void *)rcu_access_pointer(bss->pub.beacon_ies); |
776b3580 | 124 | if (ies && !bss->pub.hidden_beacon_bss) |
9caf0364 JB |
125 | kfree_rcu(ies, rcu_head); |
126 | ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies); | |
127 | if (ies) | |
128 | kfree_rcu(ies, rcu_head); | |
e8e27c66 | 129 | |
776b3580 JB |
130 | /* |
131 | * This happens when the module is removed, it doesn't | |
132 | * really matter any more save for completeness | |
133 | */ | |
134 | if (!list_empty(&bss->hidden_list)) | |
135 | list_del(&bss->hidden_list); | |
136 | ||
e8e27c66 AK |
137 | kfree(bss); |
138 | } | |
139 | ||
1b8ec87a | 140 | static inline void bss_ref_get(struct cfg80211_registered_device *rdev, |
776b3580 | 141 | struct cfg80211_internal_bss *bss) |
0532d4f1 | 142 | { |
1b8ec87a | 143 | lockdep_assert_held(&rdev->bss_lock); |
776b3580 JB |
144 | |
145 | bss->refcount++; | |
146 | if (bss->pub.hidden_beacon_bss) { | |
147 | bss = container_of(bss->pub.hidden_beacon_bss, | |
148 | struct cfg80211_internal_bss, | |
149 | pub); | |
150 | bss->refcount++; | |
151 | } | |
7011ba58 SS |
152 | if (bss->pub.transmitted_bss) { |
153 | bss = container_of(bss->pub.transmitted_bss, | |
a3584f56 SS |
154 | struct cfg80211_internal_bss, |
155 | pub); | |
156 | bss->refcount++; | |
157 | } | |
0532d4f1 JB |
158 | } |
159 | ||
1b8ec87a | 160 | static inline void bss_ref_put(struct cfg80211_registered_device *rdev, |
776b3580 | 161 | struct cfg80211_internal_bss *bss) |
0532d4f1 | 162 | { |
1b8ec87a | 163 | lockdep_assert_held(&rdev->bss_lock); |
776b3580 JB |
164 | |
165 | if (bss->pub.hidden_beacon_bss) { | |
166 | struct cfg80211_internal_bss *hbss; | |
167 | hbss = container_of(bss->pub.hidden_beacon_bss, | |
168 | struct cfg80211_internal_bss, | |
169 | pub); | |
170 | hbss->refcount--; | |
171 | if (hbss->refcount == 0) | |
172 | bss_free(hbss); | |
173 | } | |
a3584f56 | 174 | |
7011ba58 | 175 | if (bss->pub.transmitted_bss) { |
a3584f56 SS |
176 | struct cfg80211_internal_bss *tbss; |
177 | ||
7011ba58 | 178 | tbss = container_of(bss->pub.transmitted_bss, |
a3584f56 SS |
179 | struct cfg80211_internal_bss, |
180 | pub); | |
181 | tbss->refcount--; | |
182 | if (tbss->refcount == 0) | |
183 | bss_free(tbss); | |
184 | } | |
185 | ||
776b3580 JB |
186 | bss->refcount--; |
187 | if (bss->refcount == 0) | |
188 | bss_free(bss); | |
0532d4f1 JB |
189 | } |
190 | ||
1b8ec87a | 191 | static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev, |
e8e27c66 AK |
192 | struct cfg80211_internal_bss *bss) |
193 | { | |
1b8ec87a | 194 | lockdep_assert_held(&rdev->bss_lock); |
4b1af479 | 195 | |
776b3580 JB |
196 | if (!list_empty(&bss->hidden_list)) { |
197 | /* | |
198 | * don't remove the beacon entry if it has | |
199 | * probe responses associated with it | |
200 | */ | |
201 | if (!bss->pub.hidden_beacon_bss) | |
202 | return false; | |
203 | /* | |
204 | * if it's a probe response entry break its | |
205 | * link to the other entries in the group | |
206 | */ | |
207 | list_del_init(&bss->hidden_list); | |
208 | } | |
209 | ||
e8e27c66 | 210 | list_del_init(&bss->list); |
7011ba58 | 211 | list_del_init(&bss->pub.nontrans_list); |
1b8ec87a | 212 | rb_erase(&bss->rbn, &rdev->bss_tree); |
9853a55e JB |
213 | rdev->bss_entries--; |
214 | WARN_ONCE((rdev->bss_entries == 0) ^ list_empty(&rdev->bss_list), | |
215 | "rdev bss entries[%d]/list[empty:%d] corruption\n", | |
216 | rdev->bss_entries, list_empty(&rdev->bss_list)); | |
1b8ec87a | 217 | bss_ref_put(rdev, bss); |
776b3580 | 218 | return true; |
e8e27c66 AK |
219 | } |
220 | ||
f7dacfb1 SS |
221 | bool cfg80211_is_element_inherited(const struct element *elem, |
222 | const struct element *non_inherit_elem) | |
223 | { | |
224 | u8 id_len, ext_id_len, i, loop_len, id; | |
225 | const u8 *list; | |
226 | ||
227 | if (elem->id == WLAN_EID_MULTIPLE_BSSID) | |
228 | return false; | |
229 | ||
230 | if (!non_inherit_elem || non_inherit_elem->datalen < 2) | |
231 | return true; | |
232 | ||
233 | /* | |
234 | * non inheritance element format is: | |
235 | * ext ID (56) | IDs list len | list | extension IDs list len | list | |
236 | * Both lists are optional. Both lengths are mandatory. | |
237 | * This means valid length is: | |
238 | * elem_len = 1 (extension ID) + 2 (list len fields) + list lengths | |
239 | */ | |
240 | id_len = non_inherit_elem->data[1]; | |
241 | if (non_inherit_elem->datalen < 3 + id_len) | |
242 | return true; | |
243 | ||
244 | ext_id_len = non_inherit_elem->data[2 + id_len]; | |
245 | if (non_inherit_elem->datalen < 3 + id_len + ext_id_len) | |
246 | return true; | |
247 | ||
248 | if (elem->id == WLAN_EID_EXTENSION) { | |
249 | if (!ext_id_len) | |
250 | return true; | |
251 | loop_len = ext_id_len; | |
252 | list = &non_inherit_elem->data[3 + id_len]; | |
253 | id = elem->data[0]; | |
254 | } else { | |
255 | if (!id_len) | |
256 | return true; | |
257 | loop_len = id_len; | |
258 | list = &non_inherit_elem->data[2]; | |
259 | id = elem->id; | |
260 | } | |
261 | ||
262 | for (i = 0; i < loop_len; i++) { | |
263 | if (list[i] == id) | |
264 | return false; | |
265 | } | |
266 | ||
267 | return true; | |
268 | } | |
269 | EXPORT_SYMBOL(cfg80211_is_element_inherited); | |
270 | ||
0b8fb823 PX |
271 | static size_t cfg80211_gen_new_ie(const u8 *ie, size_t ielen, |
272 | const u8 *subelement, size_t subie_len, | |
273 | u8 *new_ie, gfp_t gfp) | |
274 | { | |
275 | u8 *pos, *tmp; | |
276 | const u8 *tmp_old, *tmp_new; | |
f7dacfb1 | 277 | const struct element *non_inherit_elem; |
0b8fb823 PX |
278 | u8 *sub_copy; |
279 | ||
280 | /* copy subelement as we need to change its content to | |
281 | * mark an ie after it is processed. | |
282 | */ | |
90abf96a | 283 | sub_copy = kmemdup(subelement, subie_len, gfp); |
0b8fb823 PX |
284 | if (!sub_copy) |
285 | return 0; | |
0b8fb823 PX |
286 | |
287 | pos = &new_ie[0]; | |
288 | ||
289 | /* set new ssid */ | |
290 | tmp_new = cfg80211_find_ie(WLAN_EID_SSID, sub_copy, subie_len); | |
291 | if (tmp_new) { | |
292 | memcpy(pos, tmp_new, tmp_new[1] + 2); | |
293 | pos += (tmp_new[1] + 2); | |
294 | } | |
295 | ||
f7dacfb1 SS |
296 | /* get non inheritance list if exists */ |
297 | non_inherit_elem = | |
298 | cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE, | |
299 | sub_copy, subie_len); | |
300 | ||
0b8fb823 PX |
301 | /* go through IEs in ie (skip SSID) and subelement, |
302 | * merge them into new_ie | |
303 | */ | |
304 | tmp_old = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen); | |
305 | tmp_old = (tmp_old) ? tmp_old + tmp_old[1] + 2 : ie; | |
306 | ||
307 | while (tmp_old + tmp_old[1] + 2 - ie <= ielen) { | |
308 | if (tmp_old[0] == 0) { | |
309 | tmp_old++; | |
310 | continue; | |
311 | } | |
312 | ||
c17fe043 SS |
313 | if (tmp_old[0] == WLAN_EID_EXTENSION) |
314 | tmp = (u8 *)cfg80211_find_ext_ie(tmp_old[2], sub_copy, | |
315 | subie_len); | |
316 | else | |
317 | tmp = (u8 *)cfg80211_find_ie(tmp_old[0], sub_copy, | |
318 | subie_len); | |
319 | ||
0b8fb823 | 320 | if (!tmp) { |
f7dacfb1 SS |
321 | const struct element *old_elem = (void *)tmp_old; |
322 | ||
0b8fb823 | 323 | /* ie in old ie but not in subelement */ |
f7dacfb1 SS |
324 | if (cfg80211_is_element_inherited(old_elem, |
325 | non_inherit_elem)) { | |
0b8fb823 PX |
326 | memcpy(pos, tmp_old, tmp_old[1] + 2); |
327 | pos += tmp_old[1] + 2; | |
328 | } | |
329 | } else { | |
330 | /* ie in transmitting ie also in subelement, | |
331 | * copy from subelement and flag the ie in subelement | |
c17fe043 SS |
332 | * as copied (by setting eid field to WLAN_EID_SSID, |
333 | * which is skipped anyway). | |
334 | * For vendor ie, compare OUI + type + subType to | |
0b8fb823 PX |
335 | * determine if they are the same ie. |
336 | */ | |
337 | if (tmp_old[0] == WLAN_EID_VENDOR_SPECIFIC) { | |
338 | if (!memcmp(tmp_old + 2, tmp + 2, 5)) { | |
339 | /* same vendor ie, copy from | |
340 | * subelement | |
341 | */ | |
342 | memcpy(pos, tmp, tmp[1] + 2); | |
343 | pos += tmp[1] + 2; | |
c17fe043 | 344 | tmp[0] = WLAN_EID_SSID; |
0b8fb823 PX |
345 | } else { |
346 | memcpy(pos, tmp_old, tmp_old[1] + 2); | |
347 | pos += tmp_old[1] + 2; | |
348 | } | |
349 | } else { | |
350 | /* copy ie from subelement into new ie */ | |
351 | memcpy(pos, tmp, tmp[1] + 2); | |
352 | pos += tmp[1] + 2; | |
c17fe043 | 353 | tmp[0] = WLAN_EID_SSID; |
0b8fb823 PX |
354 | } |
355 | } | |
356 | ||
357 | if (tmp_old + tmp_old[1] + 2 - ie == ielen) | |
358 | break; | |
359 | ||
360 | tmp_old += tmp_old[1] + 2; | |
361 | } | |
362 | ||
363 | /* go through subelement again to check if there is any ie not | |
364 | * copied to new ie, skip ssid, capability, bssid-index ie | |
365 | */ | |
366 | tmp_new = sub_copy; | |
367 | while (tmp_new + tmp_new[1] + 2 - sub_copy <= subie_len) { | |
368 | if (!(tmp_new[0] == WLAN_EID_NON_TX_BSSID_CAP || | |
5bd9d108 | 369 | tmp_new[0] == WLAN_EID_SSID)) { |
0b8fb823 PX |
370 | memcpy(pos, tmp_new, tmp_new[1] + 2); |
371 | pos += tmp_new[1] + 2; | |
372 | } | |
373 | if (tmp_new + tmp_new[1] + 2 - sub_copy == subie_len) | |
374 | break; | |
375 | tmp_new += tmp_new[1] + 2; | |
376 | } | |
377 | ||
378 | kfree(sub_copy); | |
379 | return pos - new_ie; | |
380 | } | |
381 | ||
382 | static bool is_bss(struct cfg80211_bss *a, const u8 *bssid, | |
383 | const u8 *ssid, size_t ssid_len) | |
384 | { | |
385 | const struct cfg80211_bss_ies *ies; | |
386 | const u8 *ssidie; | |
387 | ||
388 | if (bssid && !ether_addr_equal(a->bssid, bssid)) | |
389 | return false; | |
390 | ||
391 | if (!ssid) | |
392 | return true; | |
393 | ||
394 | ies = rcu_access_pointer(a->ies); | |
395 | if (!ies) | |
396 | return false; | |
397 | ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); | |
398 | if (!ssidie) | |
399 | return false; | |
400 | if (ssidie[1] != ssid_len) | |
401 | return false; | |
402 | return memcmp(ssidie + 2, ssid, ssid_len) == 0; | |
403 | } | |
404 | ||
405 | static int | |
7011ba58 SS |
406 | cfg80211_add_nontrans_list(struct cfg80211_bss *trans_bss, |
407 | struct cfg80211_bss *nontrans_bss) | |
0b8fb823 PX |
408 | { |
409 | const u8 *ssid; | |
410 | size_t ssid_len; | |
7011ba58 | 411 | struct cfg80211_bss *bss = NULL; |
0b8fb823 PX |
412 | |
413 | rcu_read_lock(); | |
7011ba58 | 414 | ssid = ieee80211_bss_get_ie(nontrans_bss, WLAN_EID_SSID); |
0b8fb823 PX |
415 | if (!ssid) { |
416 | rcu_read_unlock(); | |
417 | return -EINVAL; | |
418 | } | |
419 | ssid_len = ssid[1]; | |
420 | ssid = ssid + 2; | |
421 | rcu_read_unlock(); | |
422 | ||
423 | /* check if nontrans_bss is in the list */ | |
424 | list_for_each_entry(bss, &trans_bss->nontrans_list, nontrans_list) { | |
7011ba58 | 425 | if (is_bss(bss, nontrans_bss->bssid, ssid, ssid_len)) |
0b8fb823 PX |
426 | return 0; |
427 | } | |
428 | ||
429 | /* add to the list */ | |
430 | list_add_tail(&nontrans_bss->nontrans_list, &trans_bss->nontrans_list); | |
431 | return 0; | |
432 | } | |
433 | ||
1b8ec87a | 434 | static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev, |
15d6030b SL |
435 | unsigned long expire_time) |
436 | { | |
437 | struct cfg80211_internal_bss *bss, *tmp; | |
438 | bool expired = false; | |
439 | ||
1b8ec87a | 440 | lockdep_assert_held(&rdev->bss_lock); |
4b1af479 | 441 | |
1b8ec87a | 442 | list_for_each_entry_safe(bss, tmp, &rdev->bss_list, list) { |
15d6030b SL |
443 | if (atomic_read(&bss->hold)) |
444 | continue; | |
445 | if (!time_after(expire_time, bss->ts)) | |
446 | continue; | |
447 | ||
1b8ec87a | 448 | if (__cfg80211_unlink_bss(rdev, bss)) |
776b3580 | 449 | expired = true; |
15d6030b SL |
450 | } |
451 | ||
452 | if (expired) | |
1b8ec87a | 453 | rdev->bss_generation++; |
15d6030b SL |
454 | } |
455 | ||
9853a55e JB |
456 | static bool cfg80211_bss_expire_oldest(struct cfg80211_registered_device *rdev) |
457 | { | |
458 | struct cfg80211_internal_bss *bss, *oldest = NULL; | |
459 | bool ret; | |
460 | ||
461 | lockdep_assert_held(&rdev->bss_lock); | |
462 | ||
463 | list_for_each_entry(bss, &rdev->bss_list, list) { | |
464 | if (atomic_read(&bss->hold)) | |
465 | continue; | |
466 | ||
467 | if (!list_empty(&bss->hidden_list) && | |
468 | !bss->pub.hidden_beacon_bss) | |
469 | continue; | |
470 | ||
471 | if (oldest && time_before(oldest->ts, bss->ts)) | |
472 | continue; | |
473 | oldest = bss; | |
474 | } | |
475 | ||
476 | if (WARN_ON(!oldest)) | |
477 | return false; | |
478 | ||
479 | /* | |
480 | * The callers make sure to increase rdev->bss_generation if anything | |
481 | * gets removed (and a new entry added), so there's no need to also do | |
482 | * it here. | |
483 | */ | |
484 | ||
485 | ret = __cfg80211_unlink_bss(rdev, oldest); | |
486 | WARN_ON(!ret); | |
487 | return ret; | |
488 | } | |
489 | ||
c8cb5b85 TM |
490 | static u8 cfg80211_parse_bss_param(u8 data, |
491 | struct cfg80211_colocated_ap *coloc_ap) | |
492 | { | |
493 | coloc_ap->oct_recommended = | |
494 | u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_OCT_RECOMMENDED); | |
495 | coloc_ap->same_ssid = | |
496 | u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_SAME_SSID); | |
497 | coloc_ap->multi_bss = | |
498 | u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_MULTI_BSSID); | |
499 | coloc_ap->transmitted_bssid = | |
500 | u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_TRANSMITTED_BSSID); | |
501 | coloc_ap->unsolicited_probe = | |
502 | u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_PROBE_ACTIVE); | |
503 | coloc_ap->colocated_ess = | |
504 | u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_COLOC_ESS); | |
505 | ||
506 | return u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_COLOC_AP); | |
507 | } | |
508 | ||
509 | static int cfg80211_calc_short_ssid(const struct cfg80211_bss_ies *ies, | |
510 | const struct element **elem, u32 *s_ssid) | |
511 | { | |
512 | ||
513 | *elem = cfg80211_find_elem(WLAN_EID_SSID, ies->data, ies->len); | |
514 | if (!*elem || (*elem)->datalen > IEEE80211_MAX_SSID_LEN) | |
515 | return -EINVAL; | |
516 | ||
517 | *s_ssid = ~crc32_le(~0, (*elem)->data, (*elem)->datalen); | |
518 | return 0; | |
519 | } | |
520 | ||
521 | static void cfg80211_free_coloc_ap_list(struct list_head *coloc_ap_list) | |
522 | { | |
523 | struct cfg80211_colocated_ap *ap, *tmp_ap; | |
524 | ||
525 | list_for_each_entry_safe(ap, tmp_ap, coloc_ap_list, list) { | |
526 | list_del(&ap->list); | |
527 | kfree(ap); | |
528 | } | |
529 | } | |
530 | ||
531 | static int cfg80211_parse_ap_info(struct cfg80211_colocated_ap *entry, | |
532 | const u8 *pos, u8 length, | |
533 | const struct element *ssid_elem, | |
534 | int s_ssid_tmp) | |
535 | { | |
536 | /* skip the TBTT offset */ | |
537 | pos++; | |
538 | ||
539 | memcpy(entry->bssid, pos, ETH_ALEN); | |
540 | pos += ETH_ALEN; | |
541 | ||
542 | if (length == IEEE80211_TBTT_INFO_OFFSET_BSSID_SSSID_BSS_PARAM) { | |
543 | memcpy(&entry->short_ssid, pos, | |
544 | sizeof(entry->short_ssid)); | |
545 | entry->short_ssid_valid = true; | |
546 | pos += 4; | |
547 | } | |
548 | ||
549 | /* skip non colocated APs */ | |
550 | if (!cfg80211_parse_bss_param(*pos, entry)) | |
551 | return -EINVAL; | |
552 | pos++; | |
553 | ||
554 | if (length == IEEE80211_TBTT_INFO_OFFSET_BSSID_BSS_PARAM) { | |
555 | /* | |
556 | * no information about the short ssid. Consider the entry valid | |
557 | * for now. It would later be dropped in case there are explicit | |
558 | * SSIDs that need to be matched | |
559 | */ | |
560 | if (!entry->same_ssid) | |
561 | return 0; | |
562 | } | |
563 | ||
564 | if (entry->same_ssid) { | |
565 | entry->short_ssid = s_ssid_tmp; | |
566 | entry->short_ssid_valid = true; | |
567 | ||
568 | /* | |
569 | * This is safe because we validate datalen in | |
570 | * cfg80211_parse_colocated_ap(), before calling this | |
571 | * function. | |
572 | */ | |
573 | memcpy(&entry->ssid, &ssid_elem->data, | |
574 | ssid_elem->datalen); | |
575 | entry->ssid_len = ssid_elem->datalen; | |
576 | } | |
577 | return 0; | |
578 | } | |
579 | ||
580 | static int cfg80211_parse_colocated_ap(const struct cfg80211_bss_ies *ies, | |
581 | struct list_head *list) | |
582 | { | |
583 | struct ieee80211_neighbor_ap_info *ap_info; | |
584 | const struct element *elem, *ssid_elem; | |
585 | const u8 *pos, *end; | |
586 | u32 s_ssid_tmp; | |
587 | int n_coloc = 0, ret; | |
588 | LIST_HEAD(ap_list); | |
589 | ||
590 | elem = cfg80211_find_elem(WLAN_EID_REDUCED_NEIGHBOR_REPORT, ies->data, | |
591 | ies->len); | |
8a16ffdc | 592 | if (!elem) |
c8cb5b85 TM |
593 | return 0; |
594 | ||
595 | pos = elem->data; | |
596 | end = pos + elem->datalen; | |
597 | ||
598 | ret = cfg80211_calc_short_ssid(ies, &ssid_elem, &s_ssid_tmp); | |
599 | if (ret) | |
600 | return ret; | |
601 | ||
602 | /* RNR IE may contain more than one NEIGHBOR_AP_INFO */ | |
603 | while (pos + sizeof(*ap_info) <= end) { | |
604 | enum nl80211_band band; | |
605 | int freq; | |
606 | u8 length, i, count; | |
607 | ||
608 | ap_info = (void *)pos; | |
609 | count = u8_get_bits(ap_info->tbtt_info_hdr, | |
610 | IEEE80211_AP_INFO_TBTT_HDR_COUNT) + 1; | |
611 | length = ap_info->tbtt_info_len; | |
612 | ||
613 | pos += sizeof(*ap_info); | |
614 | ||
615 | if (!ieee80211_operating_class_to_band(ap_info->op_class, | |
616 | &band)) | |
617 | break; | |
618 | ||
619 | freq = ieee80211_channel_to_frequency(ap_info->channel, band); | |
620 | ||
5b5c9f3b | 621 | if (end - pos < count * length) |
c8cb5b85 TM |
622 | break; |
623 | ||
624 | /* | |
625 | * TBTT info must include bss param + BSSID + | |
626 | * (short SSID or same_ssid bit to be set). | |
627 | * ignore other options, and move to the | |
628 | * next AP info | |
629 | */ | |
630 | if (band != NL80211_BAND_6GHZ || | |
631 | (length != IEEE80211_TBTT_INFO_OFFSET_BSSID_BSS_PARAM && | |
632 | length < IEEE80211_TBTT_INFO_OFFSET_BSSID_SSSID_BSS_PARAM)) { | |
5b5c9f3b | 633 | pos += count * length; |
c8cb5b85 TM |
634 | continue; |
635 | } | |
636 | ||
637 | for (i = 0; i < count; i++) { | |
638 | struct cfg80211_colocated_ap *entry; | |
639 | ||
640 | entry = kzalloc(sizeof(*entry) + IEEE80211_MAX_SSID_LEN, | |
641 | GFP_ATOMIC); | |
642 | ||
643 | if (!entry) | |
644 | break; | |
645 | ||
646 | entry->center_freq = freq; | |
647 | ||
648 | if (!cfg80211_parse_ap_info(entry, pos, length, | |
649 | ssid_elem, s_ssid_tmp)) { | |
650 | n_coloc++; | |
651 | list_add_tail(&entry->list, &ap_list); | |
652 | } else { | |
653 | kfree(entry); | |
654 | } | |
655 | ||
5b5c9f3b | 656 | pos += length; |
c8cb5b85 TM |
657 | } |
658 | } | |
659 | ||
660 | if (pos != end) { | |
661 | cfg80211_free_coloc_ap_list(&ap_list); | |
662 | return 0; | |
663 | } | |
664 | ||
665 | list_splice_tail(&ap_list, list); | |
666 | return n_coloc; | |
667 | } | |
668 | ||
669 | static void cfg80211_scan_req_add_chan(struct cfg80211_scan_request *request, | |
670 | struct ieee80211_channel *chan, | |
671 | bool add_to_6ghz) | |
672 | { | |
673 | int i; | |
674 | u32 n_channels = request->n_channels; | |
675 | struct cfg80211_scan_6ghz_params *params = | |
676 | &request->scan_6ghz_params[request->n_6ghz_params]; | |
677 | ||
678 | for (i = 0; i < n_channels; i++) { | |
679 | if (request->channels[i] == chan) { | |
680 | if (add_to_6ghz) | |
681 | params->channel_idx = i; | |
682 | return; | |
683 | } | |
684 | } | |
685 | ||
686 | request->channels[n_channels] = chan; | |
687 | if (add_to_6ghz) | |
688 | request->scan_6ghz_params[request->n_6ghz_params].channel_idx = | |
689 | n_channels; | |
690 | ||
691 | request->n_channels++; | |
692 | } | |
693 | ||
694 | static bool cfg80211_find_ssid_match(struct cfg80211_colocated_ap *ap, | |
695 | struct cfg80211_scan_request *request) | |
696 | { | |
ba5c2523 | 697 | int i; |
c8cb5b85 TM |
698 | u32 s_ssid; |
699 | ||
700 | for (i = 0; i < request->n_ssids; i++) { | |
701 | /* wildcard ssid in the scan request */ | |
702 | if (!request->ssids[i].ssid_len) | |
703 | return true; | |
704 | ||
705 | if (ap->ssid_len && | |
706 | ap->ssid_len == request->ssids[i].ssid_len) { | |
707 | if (!memcmp(request->ssids[i].ssid, ap->ssid, | |
708 | ap->ssid_len)) | |
709 | return true; | |
710 | } else if (ap->short_ssid_valid) { | |
711 | s_ssid = ~crc32_le(~0, request->ssids[i].ssid, | |
712 | request->ssids[i].ssid_len); | |
713 | ||
714 | if (ap->short_ssid == s_ssid) | |
715 | return true; | |
716 | } | |
717 | } | |
718 | ||
719 | return false; | |
720 | } | |
721 | ||
722 | static int cfg80211_scan_6ghz(struct cfg80211_registered_device *rdev) | |
723 | { | |
724 | u8 i; | |
725 | struct cfg80211_colocated_ap *ap; | |
726 | int n_channels, count = 0, err; | |
727 | struct cfg80211_scan_request *request, *rdev_req = rdev->scan_req; | |
728 | LIST_HEAD(coloc_ap_list); | |
d590a125 | 729 | bool need_scan_psc = true; |
c8cb5b85 TM |
730 | const struct ieee80211_sband_iftype_data *iftd; |
731 | ||
732 | rdev_req->scan_6ghz = true; | |
733 | ||
734 | if (!rdev->wiphy.bands[NL80211_BAND_6GHZ]) | |
735 | return -EOPNOTSUPP; | |
736 | ||
737 | iftd = ieee80211_get_sband_iftype_data(rdev->wiphy.bands[NL80211_BAND_6GHZ], | |
738 | rdev_req->wdev->iftype); | |
739 | if (!iftd || !iftd->he_cap.has_he) | |
740 | return -EOPNOTSUPP; | |
741 | ||
742 | n_channels = rdev->wiphy.bands[NL80211_BAND_6GHZ]->n_channels; | |
743 | ||
744 | if (rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ) { | |
745 | struct cfg80211_internal_bss *intbss; | |
746 | ||
747 | spin_lock_bh(&rdev->bss_lock); | |
748 | list_for_each_entry(intbss, &rdev->bss_list, list) { | |
749 | struct cfg80211_bss *res = &intbss->pub; | |
750 | const struct cfg80211_bss_ies *ies; | |
751 | ||
752 | ies = rcu_access_pointer(res->ies); | |
753 | count += cfg80211_parse_colocated_ap(ies, | |
754 | &coloc_ap_list); | |
755 | } | |
756 | spin_unlock_bh(&rdev->bss_lock); | |
757 | } | |
758 | ||
759 | request = kzalloc(struct_size(request, channels, n_channels) + | |
52bb2052 IP |
760 | sizeof(*request->scan_6ghz_params) * count + |
761 | sizeof(*request->ssids) * rdev_req->n_ssids, | |
c8cb5b85 TM |
762 | GFP_KERNEL); |
763 | if (!request) { | |
764 | cfg80211_free_coloc_ap_list(&coloc_ap_list); | |
765 | return -ENOMEM; | |
766 | } | |
767 | ||
768 | *request = *rdev_req; | |
769 | request->n_channels = 0; | |
770 | request->scan_6ghz_params = | |
771 | (void *)&request->channels[n_channels]; | |
772 | ||
773 | /* | |
d590a125 AB |
774 | * PSC channels should not be scanned in case of direct scan with 1 SSID |
775 | * and at least one of the reported co-located APs with same SSID | |
776 | * indicating that all APs in the same ESS are co-located | |
c8cb5b85 | 777 | */ |
d590a125 | 778 | if (count && request->n_ssids == 1 && request->ssids[0].ssid_len) { |
c8cb5b85 | 779 | list_for_each_entry(ap, &coloc_ap_list, list) { |
d590a125 AB |
780 | if (ap->colocated_ess && |
781 | cfg80211_find_ssid_match(ap, request)) { | |
782 | need_scan_psc = false; | |
c8cb5b85 TM |
783 | break; |
784 | } | |
785 | } | |
c8cb5b85 TM |
786 | } |
787 | ||
788 | /* | |
789 | * add to the scan request the channels that need to be scanned | |
790 | * regardless of the collocated APs (PSC channels or all channels | |
791 | * in case that NL80211_SCAN_FLAG_COLOCATED_6GHZ is not set) | |
792 | */ | |
793 | for (i = 0; i < rdev_req->n_channels; i++) { | |
794 | if (rdev_req->channels[i]->band == NL80211_BAND_6GHZ && | |
795 | ((need_scan_psc && | |
796 | cfg80211_channel_is_psc(rdev_req->channels[i])) || | |
797 | !(rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ))) { | |
798 | cfg80211_scan_req_add_chan(request, | |
799 | rdev_req->channels[i], | |
800 | false); | |
801 | } | |
802 | } | |
803 | ||
804 | if (!(rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ)) | |
805 | goto skip; | |
806 | ||
807 | list_for_each_entry(ap, &coloc_ap_list, list) { | |
808 | bool found = false; | |
809 | struct cfg80211_scan_6ghz_params *scan_6ghz_params = | |
810 | &request->scan_6ghz_params[request->n_6ghz_params]; | |
811 | struct ieee80211_channel *chan = | |
812 | ieee80211_get_channel(&rdev->wiphy, ap->center_freq); | |
813 | ||
814 | if (!chan || chan->flags & IEEE80211_CHAN_DISABLED) | |
815 | continue; | |
816 | ||
817 | for (i = 0; i < rdev_req->n_channels; i++) { | |
818 | if (rdev_req->channels[i] == chan) | |
819 | found = true; | |
820 | } | |
821 | ||
822 | if (!found) | |
823 | continue; | |
824 | ||
825 | if (request->n_ssids > 0 && | |
826 | !cfg80211_find_ssid_match(ap, request)) | |
827 | continue; | |
828 | ||
829 | cfg80211_scan_req_add_chan(request, chan, true); | |
830 | memcpy(scan_6ghz_params->bssid, ap->bssid, ETH_ALEN); | |
831 | scan_6ghz_params->short_ssid = ap->short_ssid; | |
832 | scan_6ghz_params->short_ssid_valid = ap->short_ssid_valid; | |
833 | scan_6ghz_params->unsolicited_probe = ap->unsolicited_probe; | |
834 | ||
835 | /* | |
836 | * If a PSC channel is added to the scan and 'need_scan_psc' is | |
837 | * set to false, then all the APs that the scan logic is | |
838 | * interested with on the channel are collocated and thus there | |
839 | * is no need to perform the initial PSC channel listen. | |
840 | */ | |
841 | if (cfg80211_channel_is_psc(chan) && !need_scan_psc) | |
842 | scan_6ghz_params->psc_no_listen = true; | |
843 | ||
844 | request->n_6ghz_params++; | |
845 | } | |
846 | ||
847 | skip: | |
848 | cfg80211_free_coloc_ap_list(&coloc_ap_list); | |
849 | ||
850 | if (request->n_channels) { | |
851 | struct cfg80211_scan_request *old = rdev->int_scan_req; | |
c8cb5b85 TM |
852 | rdev->int_scan_req = request; |
853 | ||
52bb2052 IP |
854 | /* |
855 | * Add the ssids from the parent scan request to the new scan | |
856 | * request, so the driver would be able to use them in its | |
857 | * probe requests to discover hidden APs on PSC channels. | |
858 | */ | |
859 | request->ssids = (void *)&request->channels[request->n_channels]; | |
860 | request->n_ssids = rdev_req->n_ssids; | |
861 | memcpy(request->ssids, rdev_req->ssids, sizeof(*request->ssids) * | |
862 | request->n_ssids); | |
863 | ||
c8cb5b85 TM |
864 | /* |
865 | * If this scan follows a previous scan, save the scan start | |
866 | * info from the first part of the scan | |
867 | */ | |
868 | if (old) | |
869 | rdev->int_scan_req->info = old->info; | |
870 | ||
871 | err = rdev_scan(rdev, request); | |
872 | if (err) { | |
873 | rdev->int_scan_req = old; | |
874 | kfree(request); | |
875 | } else { | |
876 | kfree(old); | |
877 | } | |
878 | ||
879 | return err; | |
880 | } | |
881 | ||
882 | kfree(request); | |
883 | return -EINVAL; | |
884 | } | |
885 | ||
886 | int cfg80211_scan(struct cfg80211_registered_device *rdev) | |
887 | { | |
888 | struct cfg80211_scan_request *request; | |
889 | struct cfg80211_scan_request *rdev_req = rdev->scan_req; | |
890 | u32 n_channels = 0, idx, i; | |
891 | ||
892 | if (!(rdev->wiphy.flags & WIPHY_FLAG_SPLIT_SCAN_6GHZ)) | |
893 | return rdev_scan(rdev, rdev_req); | |
894 | ||
895 | for (i = 0; i < rdev_req->n_channels; i++) { | |
896 | if (rdev_req->channels[i]->band != NL80211_BAND_6GHZ) | |
897 | n_channels++; | |
898 | } | |
899 | ||
900 | if (!n_channels) | |
901 | return cfg80211_scan_6ghz(rdev); | |
902 | ||
903 | request = kzalloc(struct_size(request, channels, n_channels), | |
904 | GFP_KERNEL); | |
905 | if (!request) | |
906 | return -ENOMEM; | |
907 | ||
908 | *request = *rdev_req; | |
909 | request->n_channels = n_channels; | |
910 | ||
911 | for (i = idx = 0; i < rdev_req->n_channels; i++) { | |
912 | if (rdev_req->channels[i]->band != NL80211_BAND_6GHZ) | |
913 | request->channels[idx++] = rdev_req->channels[i]; | |
914 | } | |
915 | ||
916 | rdev_req->scan_6ghz = false; | |
917 | rdev->int_scan_req = request; | |
918 | return rdev_scan(rdev, request); | |
919 | } | |
920 | ||
f9d15d16 JB |
921 | void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, |
922 | bool send_message) | |
2a519311 | 923 | { |
c8cb5b85 | 924 | struct cfg80211_scan_request *request, *rdev_req; |
fd014284 | 925 | struct wireless_dev *wdev; |
f9d15d16 | 926 | struct sk_buff *msg; |
3d23e349 | 927 | #ifdef CONFIG_CFG80211_WEXT |
2a519311 JB |
928 | union iwreq_data wrqu; |
929 | #endif | |
930 | ||
a05829a7 | 931 | lockdep_assert_held(&rdev->wiphy.mtx); |
01a0ac41 | 932 | |
f9d15d16 | 933 | if (rdev->scan_msg) { |
505a2e88 | 934 | nl80211_send_scan_msg(rdev, rdev->scan_msg); |
f9d15d16 JB |
935 | rdev->scan_msg = NULL; |
936 | return; | |
937 | } | |
667503dd | 938 | |
c8cb5b85 TM |
939 | rdev_req = rdev->scan_req; |
940 | if (!rdev_req) | |
01a0ac41 JB |
941 | return; |
942 | ||
c8cb5b85 TM |
943 | wdev = rdev_req->wdev; |
944 | request = rdev->int_scan_req ? rdev->int_scan_req : rdev_req; | |
945 | ||
946 | if (wdev_running(wdev) && | |
947 | (rdev->wiphy.flags & WIPHY_FLAG_SPLIT_SCAN_6GHZ) && | |
948 | !rdev_req->scan_6ghz && !request->info.aborted && | |
949 | !cfg80211_scan_6ghz(rdev)) | |
950 | return; | |
2a519311 | 951 | |
6829c878 JB |
952 | /* |
953 | * This must be before sending the other events! | |
954 | * Otherwise, wpa_supplicant gets completely confused with | |
955 | * wext events. | |
956 | */ | |
fd014284 JB |
957 | if (wdev->netdev) |
958 | cfg80211_sme_scan_done(wdev->netdev); | |
6829c878 | 959 | |
1d76250b | 960 | if (!request->info.aborted && |
f9d15d16 JB |
961 | request->flags & NL80211_SCAN_FLAG_FLUSH) { |
962 | /* flush entries from previous scans */ | |
963 | spin_lock_bh(&rdev->bss_lock); | |
964 | __cfg80211_bss_expire(rdev, request->scan_start); | |
965 | spin_unlock_bh(&rdev->bss_lock); | |
15d6030b | 966 | } |
2a519311 | 967 | |
1d76250b | 968 | msg = nl80211_build_scan_msg(rdev, wdev, request->info.aborted); |
f9d15d16 | 969 | |
3d23e349 | 970 | #ifdef CONFIG_CFG80211_WEXT |
1d76250b | 971 | if (wdev->netdev && !request->info.aborted) { |
2a519311 JB |
972 | memset(&wrqu, 0, sizeof(wrqu)); |
973 | ||
fd014284 | 974 | wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL); |
2a519311 JB |
975 | } |
976 | #endif | |
977 | ||
1160dfa1 | 978 | dev_put(wdev->netdev); |
2a519311 | 979 | |
c8cb5b85 TM |
980 | kfree(rdev->int_scan_req); |
981 | rdev->int_scan_req = NULL; | |
982 | ||
983 | kfree(rdev->scan_req); | |
36e6fea8 | 984 | rdev->scan_req = NULL; |
f9d15d16 JB |
985 | |
986 | if (!send_message) | |
987 | rdev->scan_msg = msg; | |
988 | else | |
505a2e88 | 989 | nl80211_send_scan_msg(rdev, msg); |
2a519311 | 990 | } |
667503dd | 991 | |
36e6fea8 JB |
992 | void __cfg80211_scan_done(struct work_struct *wk) |
993 | { | |
994 | struct cfg80211_registered_device *rdev; | |
995 | ||
996 | rdev = container_of(wk, struct cfg80211_registered_device, | |
997 | scan_done_wk); | |
998 | ||
a05829a7 | 999 | wiphy_lock(&rdev->wiphy); |
f9d15d16 | 1000 | ___cfg80211_scan_done(rdev, true); |
a05829a7 | 1001 | wiphy_unlock(&rdev->wiphy); |
36e6fea8 JB |
1002 | } |
1003 | ||
1d76250b AS |
1004 | void cfg80211_scan_done(struct cfg80211_scan_request *request, |
1005 | struct cfg80211_scan_info *info) | |
667503dd | 1006 | { |
c8cb5b85 TM |
1007 | struct cfg80211_scan_info old_info = request->info; |
1008 | ||
1d76250b | 1009 | trace_cfg80211_scan_done(request, info); |
c8cb5b85 TM |
1010 | WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req && |
1011 | request != wiphy_to_rdev(request->wiphy)->int_scan_req); | |
667503dd | 1012 | |
1d76250b | 1013 | request->info = *info; |
c8cb5b85 TM |
1014 | |
1015 | /* | |
1016 | * In case the scan is split, the scan_start_tsf and tsf_bssid should | |
1017 | * be of the first part. In such a case old_info.scan_start_tsf should | |
1018 | * be non zero. | |
1019 | */ | |
1020 | if (request->scan_6ghz && old_info.scan_start_tsf) { | |
1021 | request->info.scan_start_tsf = old_info.scan_start_tsf; | |
1022 | memcpy(request->info.tsf_bssid, old_info.tsf_bssid, | |
1023 | sizeof(request->info.tsf_bssid)); | |
1024 | } | |
1025 | ||
5fe231e8 | 1026 | request->notified = true; |
f26cbf40 | 1027 | queue_work(cfg80211_wq, &wiphy_to_rdev(request->wiphy)->scan_done_wk); |
667503dd | 1028 | } |
2a519311 JB |
1029 | EXPORT_SYMBOL(cfg80211_scan_done); |
1030 | ||
ca986ad9 AVS |
1031 | void cfg80211_add_sched_scan_req(struct cfg80211_registered_device *rdev, |
1032 | struct cfg80211_sched_scan_request *req) | |
1033 | { | |
a05829a7 | 1034 | lockdep_assert_held(&rdev->wiphy.mtx); |
ca986ad9 AVS |
1035 | |
1036 | list_add_rcu(&req->list, &rdev->sched_scan_req_list); | |
1037 | } | |
1038 | ||
1039 | static void cfg80211_del_sched_scan_req(struct cfg80211_registered_device *rdev, | |
1040 | struct cfg80211_sched_scan_request *req) | |
1041 | { | |
a05829a7 | 1042 | lockdep_assert_held(&rdev->wiphy.mtx); |
ca986ad9 AVS |
1043 | |
1044 | list_del_rcu(&req->list); | |
1045 | kfree_rcu(req, rcu_head); | |
1046 | } | |
1047 | ||
1048 | static struct cfg80211_sched_scan_request * | |
1049 | cfg80211_find_sched_scan_req(struct cfg80211_registered_device *rdev, u64 reqid) | |
1050 | { | |
1051 | struct cfg80211_sched_scan_request *pos; | |
1052 | ||
3ee9306b | 1053 | list_for_each_entry_rcu(pos, &rdev->sched_scan_req_list, list, |
a05829a7 | 1054 | lockdep_is_held(&rdev->wiphy.mtx)) { |
ca986ad9 AVS |
1055 | if (pos->reqid == reqid) |
1056 | return pos; | |
1057 | } | |
b34939b9 | 1058 | return NULL; |
ca986ad9 AVS |
1059 | } |
1060 | ||
1061 | /* | |
1062 | * Determines if a scheduled scan request can be handled. When a legacy | |
1063 | * scheduled scan is running no other scheduled scan is allowed regardless | |
1064 | * whether the request is for legacy or multi-support scan. When a multi-support | |
1065 | * scheduled scan is running a request for legacy scan is not allowed. In this | |
1066 | * case a request for multi-support scan can be handled if resources are | |
1067 | * available, ie. struct wiphy::max_sched_scan_reqs limit is not yet reached. | |
1068 | */ | |
1069 | int cfg80211_sched_scan_req_possible(struct cfg80211_registered_device *rdev, | |
1070 | bool want_multi) | |
1071 | { | |
1072 | struct cfg80211_sched_scan_request *pos; | |
1073 | int i = 0; | |
1074 | ||
1075 | list_for_each_entry(pos, &rdev->sched_scan_req_list, list) { | |
1076 | /* request id zero means legacy in progress */ | |
1077 | if (!i && !pos->reqid) | |
1078 | return -EINPROGRESS; | |
1079 | i++; | |
1080 | } | |
1081 | ||
1082 | if (i) { | |
1083 | /* no legacy allowed when multi request(s) are active */ | |
1084 | if (!want_multi) | |
1085 | return -EINPROGRESS; | |
1086 | ||
1087 | /* resource limit reached */ | |
1088 | if (i == rdev->wiphy.max_sched_scan_reqs) | |
1089 | return -ENOSPC; | |
1090 | } | |
1091 | return 0; | |
1092 | } | |
1093 | ||
b34939b9 | 1094 | void cfg80211_sched_scan_results_wk(struct work_struct *work) |
807f8a8c LC |
1095 | { |
1096 | struct cfg80211_registered_device *rdev; | |
b34939b9 | 1097 | struct cfg80211_sched_scan_request *req, *tmp; |
807f8a8c | 1098 | |
b34939b9 AVS |
1099 | rdev = container_of(work, struct cfg80211_registered_device, |
1100 | sched_scan_res_wk); | |
807f8a8c | 1101 | |
a05829a7 | 1102 | wiphy_lock(&rdev->wiphy); |
b34939b9 AVS |
1103 | list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) { |
1104 | if (req->report_results) { | |
1105 | req->report_results = false; | |
1106 | if (req->flags & NL80211_SCAN_FLAG_FLUSH) { | |
1107 | /* flush entries from previous scans */ | |
1108 | spin_lock_bh(&rdev->bss_lock); | |
1109 | __cfg80211_bss_expire(rdev, req->scan_start); | |
1110 | spin_unlock_bh(&rdev->bss_lock); | |
1111 | req->scan_start = jiffies; | |
1112 | } | |
1113 | nl80211_send_sched_scan(req, | |
1114 | NL80211_CMD_SCHED_SCAN_RESULTS); | |
15d6030b | 1115 | } |
15d6030b | 1116 | } |
a05829a7 | 1117 | wiphy_unlock(&rdev->wiphy); |
807f8a8c LC |
1118 | } |
1119 | ||
b34939b9 | 1120 | void cfg80211_sched_scan_results(struct wiphy *wiphy, u64 reqid) |
807f8a8c | 1121 | { |
ca986ad9 AVS |
1122 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
1123 | struct cfg80211_sched_scan_request *request; | |
1124 | ||
b34939b9 | 1125 | trace_cfg80211_sched_scan_results(wiphy, reqid); |
807f8a8c | 1126 | /* ignore if we're not scanning */ |
31a60ed1 | 1127 | |
1b57b621 | 1128 | rcu_read_lock(); |
b34939b9 AVS |
1129 | request = cfg80211_find_sched_scan_req(rdev, reqid); |
1130 | if (request) { | |
1131 | request->report_results = true; | |
1132 | queue_work(cfg80211_wq, &rdev->sched_scan_res_wk); | |
1133 | } | |
1b57b621 | 1134 | rcu_read_unlock(); |
807f8a8c LC |
1135 | } |
1136 | EXPORT_SYMBOL(cfg80211_sched_scan_results); | |
1137 | ||
a05829a7 | 1138 | void cfg80211_sched_scan_stopped_locked(struct wiphy *wiphy, u64 reqid) |
807f8a8c | 1139 | { |
f26cbf40 | 1140 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
807f8a8c | 1141 | |
a05829a7 | 1142 | lockdep_assert_held(&wiphy->mtx); |
792e6aa7 | 1143 | |
b34939b9 | 1144 | trace_cfg80211_sched_scan_stopped(wiphy, reqid); |
4ee3e063 | 1145 | |
b34939b9 | 1146 | __cfg80211_stop_sched_scan(rdev, reqid, true); |
792e6aa7 | 1147 | } |
a05829a7 | 1148 | EXPORT_SYMBOL(cfg80211_sched_scan_stopped_locked); |
792e6aa7 | 1149 | |
b34939b9 | 1150 | void cfg80211_sched_scan_stopped(struct wiphy *wiphy, u64 reqid) |
792e6aa7 | 1151 | { |
a05829a7 JB |
1152 | wiphy_lock(wiphy); |
1153 | cfg80211_sched_scan_stopped_locked(wiphy, reqid); | |
1154 | wiphy_unlock(wiphy); | |
807f8a8c | 1155 | } |
807f8a8c LC |
1156 | EXPORT_SYMBOL(cfg80211_sched_scan_stopped); |
1157 | ||
ca986ad9 AVS |
1158 | int cfg80211_stop_sched_scan_req(struct cfg80211_registered_device *rdev, |
1159 | struct cfg80211_sched_scan_request *req, | |
1160 | bool driver_initiated) | |
807f8a8c | 1161 | { |
a05829a7 | 1162 | lockdep_assert_held(&rdev->wiphy.mtx); |
807f8a8c | 1163 | |
85a9994a | 1164 | if (!driver_initiated) { |
3a3ecf1d | 1165 | int err = rdev_sched_scan_stop(rdev, req->dev, req->reqid); |
85a9994a LC |
1166 | if (err) |
1167 | return err; | |
1168 | } | |
807f8a8c | 1169 | |
ca986ad9 | 1170 | nl80211_send_sched_scan(req, NL80211_CMD_SCHED_SCAN_STOPPED); |
807f8a8c | 1171 | |
ca986ad9 | 1172 | cfg80211_del_sched_scan_req(rdev, req); |
807f8a8c | 1173 | |
3b4670ff | 1174 | return 0; |
807f8a8c LC |
1175 | } |
1176 | ||
ca986ad9 AVS |
1177 | int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev, |
1178 | u64 reqid, bool driver_initiated) | |
1179 | { | |
1180 | struct cfg80211_sched_scan_request *sched_scan_req; | |
1181 | ||
a05829a7 | 1182 | lockdep_assert_held(&rdev->wiphy.mtx); |
ca986ad9 AVS |
1183 | |
1184 | sched_scan_req = cfg80211_find_sched_scan_req(rdev, reqid); | |
b34939b9 AVS |
1185 | if (!sched_scan_req) |
1186 | return -ENOENT; | |
ca986ad9 AVS |
1187 | |
1188 | return cfg80211_stop_sched_scan_req(rdev, sched_scan_req, | |
1189 | driver_initiated); | |
1190 | } | |
1191 | ||
1b8ec87a | 1192 | void cfg80211_bss_age(struct cfg80211_registered_device *rdev, |
cb3a8eec DW |
1193 | unsigned long age_secs) |
1194 | { | |
1195 | struct cfg80211_internal_bss *bss; | |
1196 | unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); | |
1197 | ||
1b8ec87a ZG |
1198 | spin_lock_bh(&rdev->bss_lock); |
1199 | list_for_each_entry(bss, &rdev->bss_list, list) | |
cb3a8eec | 1200 | bss->ts -= age_jiffies; |
1b8ec87a | 1201 | spin_unlock_bh(&rdev->bss_lock); |
cb3a8eec DW |
1202 | } |
1203 | ||
1b8ec87a | 1204 | void cfg80211_bss_expire(struct cfg80211_registered_device *rdev) |
2a519311 | 1205 | { |
1b8ec87a | 1206 | __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE); |
2a519311 JB |
1207 | } |
1208 | ||
2f1805ea EG |
1209 | void cfg80211_bss_flush(struct wiphy *wiphy) |
1210 | { | |
1211 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); | |
1212 | ||
1213 | spin_lock_bh(&rdev->bss_lock); | |
1214 | __cfg80211_bss_expire(rdev, jiffies); | |
1215 | spin_unlock_bh(&rdev->bss_lock); | |
1216 | } | |
1217 | EXPORT_SYMBOL(cfg80211_bss_flush); | |
1218 | ||
49a68e0d JB |
1219 | const struct element * |
1220 | cfg80211_find_elem_match(u8 eid, const u8 *ies, unsigned int len, | |
1221 | const u8 *match, unsigned int match_len, | |
1222 | unsigned int match_offset) | |
2a519311 | 1223 | { |
0f3b07f0 JB |
1224 | const struct element *elem; |
1225 | ||
0f3b07f0 | 1226 | for_each_element_id(elem, eid, ies, len) { |
49a68e0d JB |
1227 | if (elem->datalen >= match_offset + match_len && |
1228 | !memcmp(elem->data + match_offset, match, match_len)) | |
1229 | return elem; | |
2a519311 | 1230 | } |
fbd05e4a LC |
1231 | |
1232 | return NULL; | |
2a519311 | 1233 | } |
49a68e0d | 1234 | EXPORT_SYMBOL(cfg80211_find_elem_match); |
2a519311 | 1235 | |
49a68e0d JB |
1236 | const struct element *cfg80211_find_vendor_elem(unsigned int oui, int oui_type, |
1237 | const u8 *ies, | |
1238 | unsigned int len) | |
0c28ec58 | 1239 | { |
49a68e0d | 1240 | const struct element *elem; |
fbd05e4a LC |
1241 | u8 match[] = { oui >> 16, oui >> 8, oui, oui_type }; |
1242 | int match_len = (oui_type < 0) ? 3 : sizeof(match); | |
0c28ec58 | 1243 | |
9e9ea439 EG |
1244 | if (WARN_ON(oui_type > 0xff)) |
1245 | return NULL; | |
1246 | ||
49a68e0d JB |
1247 | elem = cfg80211_find_elem_match(WLAN_EID_VENDOR_SPECIFIC, ies, len, |
1248 | match, match_len, 0); | |
6719429d | 1249 | |
49a68e0d | 1250 | if (!elem || elem->datalen < 4) |
fbd05e4a | 1251 | return NULL; |
6719429d | 1252 | |
49a68e0d | 1253 | return elem; |
0c28ec58 | 1254 | } |
49a68e0d | 1255 | EXPORT_SYMBOL(cfg80211_find_vendor_elem); |
0c28ec58 | 1256 | |
4593c4cb JB |
1257 | /** |
1258 | * enum bss_compare_mode - BSS compare mode | |
1259 | * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find) | |
1260 | * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode | |
1261 | * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode | |
1262 | */ | |
1263 | enum bss_compare_mode { | |
1264 | BSS_CMP_REGULAR, | |
1265 | BSS_CMP_HIDE_ZLEN, | |
1266 | BSS_CMP_HIDE_NUL, | |
1267 | }; | |
1268 | ||
dd9dfb9f | 1269 | static int cmp_bss(struct cfg80211_bss *a, |
5622f5bb | 1270 | struct cfg80211_bss *b, |
4593c4cb | 1271 | enum bss_compare_mode mode) |
dd9dfb9f | 1272 | { |
9caf0364 | 1273 | const struct cfg80211_bss_ies *a_ies, *b_ies; |
3af6341c JB |
1274 | const u8 *ie1 = NULL; |
1275 | const u8 *ie2 = NULL; | |
5622f5bb | 1276 | int i, r; |
dd9dfb9f | 1277 | |
3af6341c JB |
1278 | if (a->channel != b->channel) |
1279 | return b->channel->center_freq - a->channel->center_freq; | |
dd9dfb9f | 1280 | |
9caf0364 JB |
1281 | a_ies = rcu_access_pointer(a->ies); |
1282 | if (!a_ies) | |
1283 | return -1; | |
1284 | b_ies = rcu_access_pointer(b->ies); | |
1285 | if (!b_ies) | |
1286 | return 1; | |
1287 | ||
3af6341c JB |
1288 | if (WLAN_CAPABILITY_IS_STA_BSS(a->capability)) |
1289 | ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID, | |
1290 | a_ies->data, a_ies->len); | |
1291 | if (WLAN_CAPABILITY_IS_STA_BSS(b->capability)) | |
1292 | ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID, | |
1293 | b_ies->data, b_ies->len); | |
1294 | if (ie1 && ie2) { | |
1295 | int mesh_id_cmp; | |
1296 | ||
1297 | if (ie1[1] == ie2[1]) | |
1298 | mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]); | |
1299 | else | |
1300 | mesh_id_cmp = ie2[1] - ie1[1]; | |
1301 | ||
1302 | ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, | |
1303 | a_ies->data, a_ies->len); | |
1304 | ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, | |
1305 | b_ies->data, b_ies->len); | |
1306 | if (ie1 && ie2) { | |
1307 | if (mesh_id_cmp) | |
1308 | return mesh_id_cmp; | |
1309 | if (ie1[1] != ie2[1]) | |
1310 | return ie2[1] - ie1[1]; | |
1311 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); | |
1312 | } | |
1313 | } | |
1314 | ||
3af6341c JB |
1315 | r = memcmp(a->bssid, b->bssid, sizeof(a->bssid)); |
1316 | if (r) | |
1317 | return r; | |
1318 | ||
9caf0364 JB |
1319 | ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len); |
1320 | ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len); | |
dd9dfb9f | 1321 | |
5622f5bb JB |
1322 | if (!ie1 && !ie2) |
1323 | return 0; | |
1324 | ||
f94f8b16 | 1325 | /* |
5622f5bb JB |
1326 | * Note that with "hide_ssid", the function returns a match if |
1327 | * the already-present BSS ("b") is a hidden SSID beacon for | |
1328 | * the new BSS ("a"). | |
f94f8b16 | 1329 | */ |
dd9dfb9f DT |
1330 | |
1331 | /* sort missing IE before (left of) present IE */ | |
1332 | if (!ie1) | |
1333 | return -1; | |
1334 | if (!ie2) | |
1335 | return 1; | |
1336 | ||
4593c4cb JB |
1337 | switch (mode) { |
1338 | case BSS_CMP_HIDE_ZLEN: | |
1339 | /* | |
1340 | * In ZLEN mode we assume the BSS entry we're | |
1341 | * looking for has a zero-length SSID. So if | |
1342 | * the one we're looking at right now has that, | |
1343 | * return 0. Otherwise, return the difference | |
1344 | * in length, but since we're looking for the | |
1345 | * 0-length it's really equivalent to returning | |
1346 | * the length of the one we're looking at. | |
1347 | * | |
1348 | * No content comparison is needed as we assume | |
1349 | * the content length is zero. | |
1350 | */ | |
1351 | return ie2[1]; | |
1352 | case BSS_CMP_REGULAR: | |
1353 | default: | |
1354 | /* sort by length first, then by contents */ | |
1355 | if (ie1[1] != ie2[1]) | |
1356 | return ie2[1] - ie1[1]; | |
5622f5bb | 1357 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); |
4593c4cb JB |
1358 | case BSS_CMP_HIDE_NUL: |
1359 | if (ie1[1] != ie2[1]) | |
1360 | return ie2[1] - ie1[1]; | |
1361 | /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */ | |
1362 | for (i = 0; i < ie2[1]; i++) | |
1363 | if (ie2[i + 2]) | |
1364 | return -1; | |
1365 | return 0; | |
1366 | } | |
dd9dfb9f DT |
1367 | } |
1368 | ||
6eb18137 | 1369 | static bool cfg80211_bss_type_match(u16 capability, |
57fbcce3 | 1370 | enum nl80211_band band, |
6eb18137 DL |
1371 | enum ieee80211_bss_type bss_type) |
1372 | { | |
1373 | bool ret = true; | |
1374 | u16 mask, val; | |
1375 | ||
1376 | if (bss_type == IEEE80211_BSS_TYPE_ANY) | |
1377 | return ret; | |
1378 | ||
57fbcce3 | 1379 | if (band == NL80211_BAND_60GHZ) { |
6eb18137 DL |
1380 | mask = WLAN_CAPABILITY_DMG_TYPE_MASK; |
1381 | switch (bss_type) { | |
1382 | case IEEE80211_BSS_TYPE_ESS: | |
1383 | val = WLAN_CAPABILITY_DMG_TYPE_AP; | |
1384 | break; | |
1385 | case IEEE80211_BSS_TYPE_PBSS: | |
1386 | val = WLAN_CAPABILITY_DMG_TYPE_PBSS; | |
1387 | break; | |
1388 | case IEEE80211_BSS_TYPE_IBSS: | |
1389 | val = WLAN_CAPABILITY_DMG_TYPE_IBSS; | |
1390 | break; | |
1391 | default: | |
1392 | return false; | |
1393 | } | |
1394 | } else { | |
1395 | mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS; | |
1396 | switch (bss_type) { | |
1397 | case IEEE80211_BSS_TYPE_ESS: | |
1398 | val = WLAN_CAPABILITY_ESS; | |
1399 | break; | |
1400 | case IEEE80211_BSS_TYPE_IBSS: | |
1401 | val = WLAN_CAPABILITY_IBSS; | |
1402 | break; | |
1403 | case IEEE80211_BSS_TYPE_MBSS: | |
1404 | val = 0; | |
1405 | break; | |
1406 | default: | |
1407 | return false; | |
1408 | } | |
1409 | } | |
1410 | ||
1411 | ret = ((capability & mask) == val); | |
1412 | return ret; | |
1413 | } | |
1414 | ||
0e3a39b5 | 1415 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
2a519311 JB |
1416 | struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, |
1417 | struct ieee80211_channel *channel, | |
1418 | const u8 *bssid, | |
79420f09 | 1419 | const u8 *ssid, size_t ssid_len, |
6eb18137 DL |
1420 | enum ieee80211_bss_type bss_type, |
1421 | enum ieee80211_privacy privacy) | |
2a519311 | 1422 | { |
f26cbf40 | 1423 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
2a519311 | 1424 | struct cfg80211_internal_bss *bss, *res = NULL; |
ccb6c136 | 1425 | unsigned long now = jiffies; |
6eb18137 | 1426 | int bss_privacy; |
2a519311 | 1427 | |
6eb18137 DL |
1428 | trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type, |
1429 | privacy); | |
4ee3e063 | 1430 | |
1b8ec87a | 1431 | spin_lock_bh(&rdev->bss_lock); |
2a519311 | 1432 | |
1b8ec87a | 1433 | list_for_each_entry(bss, &rdev->bss_list, list) { |
6eb18137 DL |
1434 | if (!cfg80211_bss_type_match(bss->pub.capability, |
1435 | bss->pub.channel->band, bss_type)) | |
1436 | continue; | |
1437 | ||
1438 | bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY); | |
1439 | if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) || | |
1440 | (privacy == IEEE80211_PRIVACY_OFF && bss_privacy)) | |
79420f09 | 1441 | continue; |
2a519311 JB |
1442 | if (channel && bss->pub.channel != channel) |
1443 | continue; | |
c14a7400 JB |
1444 | if (!is_valid_ether_addr(bss->pub.bssid)) |
1445 | continue; | |
ccb6c136 JB |
1446 | /* Don't get expired BSS structs */ |
1447 | if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) && | |
1448 | !atomic_read(&bss->hold)) | |
1449 | continue; | |
2a519311 JB |
1450 | if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { |
1451 | res = bss; | |
1b8ec87a | 1452 | bss_ref_get(rdev, res); |
2a519311 JB |
1453 | break; |
1454 | } | |
1455 | } | |
1456 | ||
1b8ec87a | 1457 | spin_unlock_bh(&rdev->bss_lock); |
2a519311 JB |
1458 | if (!res) |
1459 | return NULL; | |
4ee3e063 | 1460 | trace_cfg80211_return_bss(&res->pub); |
2a519311 JB |
1461 | return &res->pub; |
1462 | } | |
1463 | EXPORT_SYMBOL(cfg80211_get_bss); | |
1464 | ||
1b8ec87a | 1465 | static void rb_insert_bss(struct cfg80211_registered_device *rdev, |
2a519311 JB |
1466 | struct cfg80211_internal_bss *bss) |
1467 | { | |
1b8ec87a | 1468 | struct rb_node **p = &rdev->bss_tree.rb_node; |
2a519311 JB |
1469 | struct rb_node *parent = NULL; |
1470 | struct cfg80211_internal_bss *tbss; | |
1471 | int cmp; | |
1472 | ||
1473 | while (*p) { | |
1474 | parent = *p; | |
1475 | tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); | |
1476 | ||
4593c4cb | 1477 | cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR); |
2a519311 JB |
1478 | |
1479 | if (WARN_ON(!cmp)) { | |
1480 | /* will sort of leak this BSS */ | |
1481 | return; | |
1482 | } | |
1483 | ||
1484 | if (cmp < 0) | |
1485 | p = &(*p)->rb_left; | |
1486 | else | |
1487 | p = &(*p)->rb_right; | |
1488 | } | |
1489 | ||
1490 | rb_link_node(&bss->rbn, parent, p); | |
1b8ec87a | 1491 | rb_insert_color(&bss->rbn, &rdev->bss_tree); |
2a519311 JB |
1492 | } |
1493 | ||
1494 | static struct cfg80211_internal_bss * | |
1b8ec87a | 1495 | rb_find_bss(struct cfg80211_registered_device *rdev, |
5622f5bb | 1496 | struct cfg80211_internal_bss *res, |
4593c4cb | 1497 | enum bss_compare_mode mode) |
dd9dfb9f | 1498 | { |
1b8ec87a | 1499 | struct rb_node *n = rdev->bss_tree.rb_node; |
dd9dfb9f DT |
1500 | struct cfg80211_internal_bss *bss; |
1501 | int r; | |
1502 | ||
1503 | while (n) { | |
1504 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); | |
4593c4cb | 1505 | r = cmp_bss(&res->pub, &bss->pub, mode); |
dd9dfb9f DT |
1506 | |
1507 | if (r == 0) | |
1508 | return bss; | |
1509 | else if (r < 0) | |
1510 | n = n->rb_left; | |
1511 | else | |
1512 | n = n->rb_right; | |
1513 | } | |
1514 | ||
1515 | return NULL; | |
1516 | } | |
1517 | ||
1b8ec87a | 1518 | static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev, |
776b3580 | 1519 | struct cfg80211_internal_bss *new) |
dd9dfb9f | 1520 | { |
9caf0364 | 1521 | const struct cfg80211_bss_ies *ies; |
776b3580 JB |
1522 | struct cfg80211_internal_bss *bss; |
1523 | const u8 *ie; | |
1524 | int i, ssidlen; | |
1525 | u8 fold = 0; | |
9853a55e | 1526 | u32 n_entries = 0; |
9caf0364 | 1527 | |
776b3580 | 1528 | ies = rcu_access_pointer(new->pub.beacon_ies); |
9caf0364 | 1529 | if (WARN_ON(!ies)) |
776b3580 | 1530 | return false; |
dd9dfb9f | 1531 | |
776b3580 JB |
1532 | ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); |
1533 | if (!ie) { | |
1534 | /* nothing to do */ | |
1535 | return true; | |
1536 | } | |
1537 | ||
1538 | ssidlen = ie[1]; | |
1539 | for (i = 0; i < ssidlen; i++) | |
1540 | fold |= ie[2 + i]; | |
1541 | ||
1542 | if (fold) { | |
1543 | /* not a hidden SSID */ | |
1544 | return true; | |
1545 | } | |
1546 | ||
1547 | /* This is the bad part ... */ | |
1548 | ||
1b8ec87a | 1549 | list_for_each_entry(bss, &rdev->bss_list, list) { |
9853a55e JB |
1550 | /* |
1551 | * we're iterating all the entries anyway, so take the | |
1552 | * opportunity to validate the list length accounting | |
1553 | */ | |
1554 | n_entries++; | |
1555 | ||
776b3580 JB |
1556 | if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid)) |
1557 | continue; | |
1558 | if (bss->pub.channel != new->pub.channel) | |
1559 | continue; | |
dcd6eac1 SW |
1560 | if (bss->pub.scan_width != new->pub.scan_width) |
1561 | continue; | |
776b3580 JB |
1562 | if (rcu_access_pointer(bss->pub.beacon_ies)) |
1563 | continue; | |
1564 | ies = rcu_access_pointer(bss->pub.ies); | |
1565 | if (!ies) | |
1566 | continue; | |
1567 | ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); | |
1568 | if (!ie) | |
1569 | continue; | |
1570 | if (ssidlen && ie[1] != ssidlen) | |
1571 | continue; | |
776b3580 JB |
1572 | if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss)) |
1573 | continue; | |
1574 | if (WARN_ON_ONCE(!list_empty(&bss->hidden_list))) | |
1575 | list_del(&bss->hidden_list); | |
1576 | /* combine them */ | |
1577 | list_add(&bss->hidden_list, &new->hidden_list); | |
1578 | bss->pub.hidden_beacon_bss = &new->pub; | |
1579 | new->refcount += bss->refcount; | |
1580 | rcu_assign_pointer(bss->pub.beacon_ies, | |
1581 | new->pub.beacon_ies); | |
1582 | } | |
1583 | ||
9853a55e JB |
1584 | WARN_ONCE(n_entries != rdev->bss_entries, |
1585 | "rdev bss entries[%d]/list[len:%d] corruption\n", | |
1586 | rdev->bss_entries, n_entries); | |
1587 | ||
776b3580 | 1588 | return true; |
dd9dfb9f DT |
1589 | } |
1590 | ||
0cd01efb SS |
1591 | struct cfg80211_non_tx_bss { |
1592 | struct cfg80211_bss *tx_bss; | |
1593 | u8 max_bssid_indicator; | |
1594 | u8 bssid_index; | |
1595 | }; | |
1596 | ||
3ab8227d SM |
1597 | static bool |
1598 | cfg80211_update_known_bss(struct cfg80211_registered_device *rdev, | |
1599 | struct cfg80211_internal_bss *known, | |
1600 | struct cfg80211_internal_bss *new, | |
1601 | bool signal_valid) | |
1602 | { | |
1603 | lockdep_assert_held(&rdev->bss_lock); | |
1604 | ||
1605 | /* Update IEs */ | |
1606 | if (rcu_access_pointer(new->pub.proberesp_ies)) { | |
1607 | const struct cfg80211_bss_ies *old; | |
1608 | ||
1609 | old = rcu_access_pointer(known->pub.proberesp_ies); | |
1610 | ||
1611 | rcu_assign_pointer(known->pub.proberesp_ies, | |
1612 | new->pub.proberesp_ies); | |
1613 | /* Override possible earlier Beacon frame IEs */ | |
1614 | rcu_assign_pointer(known->pub.ies, | |
1615 | new->pub.proberesp_ies); | |
1616 | if (old) | |
1617 | kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head); | |
1618 | } else if (rcu_access_pointer(new->pub.beacon_ies)) { | |
1619 | const struct cfg80211_bss_ies *old; | |
1620 | struct cfg80211_internal_bss *bss; | |
1621 | ||
1622 | if (known->pub.hidden_beacon_bss && | |
1623 | !list_empty(&known->hidden_list)) { | |
1624 | const struct cfg80211_bss_ies *f; | |
1625 | ||
1626 | /* The known BSS struct is one of the probe | |
1627 | * response members of a group, but we're | |
1628 | * receiving a beacon (beacon_ies in the new | |
1629 | * bss is used). This can only mean that the | |
1630 | * AP changed its beacon from not having an | |
1631 | * SSID to showing it, which is confusing so | |
1632 | * drop this information. | |
1633 | */ | |
1634 | ||
1635 | f = rcu_access_pointer(new->pub.beacon_ies); | |
1636 | kfree_rcu((struct cfg80211_bss_ies *)f, rcu_head); | |
1637 | return false; | |
1638 | } | |
1639 | ||
1640 | old = rcu_access_pointer(known->pub.beacon_ies); | |
1641 | ||
1642 | rcu_assign_pointer(known->pub.beacon_ies, new->pub.beacon_ies); | |
1643 | ||
1644 | /* Override IEs if they were from a beacon before */ | |
1645 | if (old == rcu_access_pointer(known->pub.ies)) | |
1646 | rcu_assign_pointer(known->pub.ies, new->pub.beacon_ies); | |
1647 | ||
1648 | /* Assign beacon IEs to all sub entries */ | |
1649 | list_for_each_entry(bss, &known->hidden_list, hidden_list) { | |
1650 | const struct cfg80211_bss_ies *ies; | |
1651 | ||
1652 | ies = rcu_access_pointer(bss->pub.beacon_ies); | |
1653 | WARN_ON(ies != old); | |
1654 | ||
1655 | rcu_assign_pointer(bss->pub.beacon_ies, | |
1656 | new->pub.beacon_ies); | |
1657 | } | |
1658 | ||
1659 | if (old) | |
1660 | kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head); | |
1661 | } | |
1662 | ||
1663 | known->pub.beacon_interval = new->pub.beacon_interval; | |
1664 | ||
1665 | /* don't update the signal if beacon was heard on | |
1666 | * adjacent channel. | |
1667 | */ | |
1668 | if (signal_valid) | |
1669 | known->pub.signal = new->pub.signal; | |
1670 | known->pub.capability = new->pub.capability; | |
1671 | known->ts = new->ts; | |
1672 | known->ts_boottime = new->ts_boottime; | |
1673 | known->parent_tsf = new->parent_tsf; | |
1674 | known->pub.chains = new->pub.chains; | |
1675 | memcpy(known->pub.chain_signal, new->pub.chain_signal, | |
1676 | IEEE80211_MAX_CHAINS); | |
1677 | ether_addr_copy(known->parent_bssid, new->parent_bssid); | |
1678 | known->pub.max_bssid_indicator = new->pub.max_bssid_indicator; | |
1679 | known->pub.bssid_index = new->pub.bssid_index; | |
1680 | ||
1681 | return true; | |
1682 | } | |
1683 | ||
0e3a39b5 | 1684 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
a3ce17d1 | 1685 | struct cfg80211_internal_bss * |
1b8ec87a | 1686 | cfg80211_bss_update(struct cfg80211_registered_device *rdev, |
3afc2167 | 1687 | struct cfg80211_internal_bss *tmp, |
a3ce17d1 | 1688 | bool signal_valid, unsigned long ts) |
2a519311 JB |
1689 | { |
1690 | struct cfg80211_internal_bss *found = NULL; | |
2a519311 | 1691 | |
9caf0364 | 1692 | if (WARN_ON(!tmp->pub.channel)) |
2a519311 | 1693 | return NULL; |
2a519311 | 1694 | |
a3ce17d1 | 1695 | tmp->ts = ts; |
2a519311 | 1696 | |
1b8ec87a | 1697 | spin_lock_bh(&rdev->bss_lock); |
2a519311 | 1698 | |
9caf0364 | 1699 | if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) { |
1b8ec87a | 1700 | spin_unlock_bh(&rdev->bss_lock); |
9caf0364 JB |
1701 | return NULL; |
1702 | } | |
1703 | ||
1b8ec87a | 1704 | found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR); |
2a519311 | 1705 | |
cd1658f5 | 1706 | if (found) { |
3ab8227d SM |
1707 | if (!cfg80211_update_known_bss(rdev, found, tmp, signal_valid)) |
1708 | goto drop; | |
2a519311 | 1709 | } else { |
9caf0364 | 1710 | struct cfg80211_internal_bss *new; |
dd9dfb9f | 1711 | struct cfg80211_internal_bss *hidden; |
9caf0364 | 1712 | struct cfg80211_bss_ies *ies; |
dd9dfb9f | 1713 | |
9caf0364 JB |
1714 | /* |
1715 | * create a copy -- the "res" variable that is passed in | |
1716 | * is allocated on the stack since it's not needed in the | |
1717 | * more common case of an update | |
1718 | */ | |
1b8ec87a | 1719 | new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size, |
9caf0364 JB |
1720 | GFP_ATOMIC); |
1721 | if (!new) { | |
1722 | ies = (void *)rcu_dereference(tmp->pub.beacon_ies); | |
1723 | if (ies) | |
1724 | kfree_rcu(ies, rcu_head); | |
1725 | ies = (void *)rcu_dereference(tmp->pub.proberesp_ies); | |
1726 | if (ies) | |
1727 | kfree_rcu(ies, rcu_head); | |
776b3580 | 1728 | goto drop; |
9caf0364 JB |
1729 | } |
1730 | memcpy(new, tmp, sizeof(*new)); | |
776b3580 JB |
1731 | new->refcount = 1; |
1732 | INIT_LIST_HEAD(&new->hidden_list); | |
7011ba58 | 1733 | INIT_LIST_HEAD(&new->pub.nontrans_list); |
776b3580 JB |
1734 | |
1735 | if (rcu_access_pointer(tmp->pub.proberesp_ies)) { | |
1b8ec87a | 1736 | hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN); |
776b3580 | 1737 | if (!hidden) |
1b8ec87a | 1738 | hidden = rb_find_bss(rdev, tmp, |
776b3580 JB |
1739 | BSS_CMP_HIDE_NUL); |
1740 | if (hidden) { | |
1741 | new->pub.hidden_beacon_bss = &hidden->pub; | |
1742 | list_add(&new->hidden_list, | |
1743 | &hidden->hidden_list); | |
1744 | hidden->refcount++; | |
1745 | rcu_assign_pointer(new->pub.beacon_ies, | |
1746 | hidden->pub.beacon_ies); | |
1747 | } | |
1748 | } else { | |
1749 | /* | |
1750 | * Ok so we found a beacon, and don't have an entry. If | |
1751 | * it's a beacon with hidden SSID, we might be in for an | |
1752 | * expensive search for any probe responses that should | |
1753 | * be grouped with this beacon for updates ... | |
1754 | */ | |
1b8ec87a | 1755 | if (!cfg80211_combine_bsses(rdev, new)) { |
f9a5c358 | 1756 | bss_ref_put(rdev, new); |
776b3580 JB |
1757 | goto drop; |
1758 | } | |
1759 | } | |
1760 | ||
9853a55e JB |
1761 | if (rdev->bss_entries >= bss_entries_limit && |
1762 | !cfg80211_bss_expire_oldest(rdev)) { | |
f9a5c358 | 1763 | bss_ref_put(rdev, new); |
9853a55e JB |
1764 | goto drop; |
1765 | } | |
1766 | ||
a3584f56 | 1767 | /* This must be before the call to bss_ref_get */ |
0cd01efb | 1768 | if (tmp->pub.transmitted_bss) { |
a3584f56 | 1769 | struct cfg80211_internal_bss *pbss = |
0cd01efb | 1770 | container_of(tmp->pub.transmitted_bss, |
a3584f56 SS |
1771 | struct cfg80211_internal_bss, |
1772 | pub); | |
1773 | ||
0cd01efb | 1774 | new->pub.transmitted_bss = tmp->pub.transmitted_bss; |
a3584f56 SS |
1775 | bss_ref_get(rdev, pbss); |
1776 | } | |
1777 | ||
1b8ec87a | 1778 | list_add_tail(&new->list, &rdev->bss_list); |
9853a55e | 1779 | rdev->bss_entries++; |
1b8ec87a | 1780 | rb_insert_bss(rdev, new); |
9caf0364 | 1781 | found = new; |
2a519311 JB |
1782 | } |
1783 | ||
1b8ec87a ZG |
1784 | rdev->bss_generation++; |
1785 | bss_ref_get(rdev, found); | |
1786 | spin_unlock_bh(&rdev->bss_lock); | |
2a519311 | 1787 | |
2a519311 | 1788 | return found; |
776b3580 | 1789 | drop: |
1b8ec87a | 1790 | spin_unlock_bh(&rdev->bss_lock); |
776b3580 | 1791 | return NULL; |
2a519311 JB |
1792 | } |
1793 | ||
119f94a6 JM |
1794 | /* |
1795 | * Update RX channel information based on the available frame payload | |
1796 | * information. This is mainly for the 2.4 GHz band where frames can be received | |
1797 | * from neighboring channels and the Beacon frames use the DSSS Parameter Set | |
1798 | * element to indicate the current (transmitting) channel, but this might also | |
1799 | * be needed on other bands if RX frequency does not match with the actual | |
1800 | * operating channel of a BSS. | |
1801 | */ | |
0172bb75 JB |
1802 | static struct ieee80211_channel * |
1803 | cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen, | |
119f94a6 JM |
1804 | struct ieee80211_channel *channel, |
1805 | enum nl80211_bss_scan_width scan_width) | |
0172bb75 JB |
1806 | { |
1807 | const u8 *tmp; | |
1808 | u32 freq; | |
1809 | int channel_number = -1; | |
119f94a6 | 1810 | struct ieee80211_channel *alt_channel; |
0172bb75 | 1811 | |
66b0564d TP |
1812 | if (channel->band == NL80211_BAND_S1GHZ) { |
1813 | tmp = cfg80211_find_ie(WLAN_EID_S1G_OPERATION, ie, ielen); | |
1814 | if (tmp && tmp[1] >= sizeof(struct ieee80211_s1g_oper_ie)) { | |
1815 | struct ieee80211_s1g_oper_ie *s1gop = (void *)(tmp + 2); | |
1816 | ||
1817 | channel_number = s1gop->primary_ch; | |
1818 | } | |
0172bb75 | 1819 | } else { |
66b0564d TP |
1820 | tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen); |
1821 | if (tmp && tmp[1] == 1) { | |
1822 | channel_number = tmp[2]; | |
1823 | } else { | |
1824 | tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen); | |
1825 | if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) { | |
1826 | struct ieee80211_ht_operation *htop = (void *)(tmp + 2); | |
0172bb75 | 1827 | |
66b0564d TP |
1828 | channel_number = htop->primary_chan; |
1829 | } | |
0172bb75 JB |
1830 | } |
1831 | } | |
1832 | ||
119f94a6 JM |
1833 | if (channel_number < 0) { |
1834 | /* No channel information in frame payload */ | |
0172bb75 | 1835 | return channel; |
119f94a6 | 1836 | } |
0172bb75 | 1837 | |
934f4c7d TP |
1838 | freq = ieee80211_channel_to_freq_khz(channel_number, channel->band); |
1839 | alt_channel = ieee80211_get_channel_khz(wiphy, freq); | |
119f94a6 JM |
1840 | if (!alt_channel) { |
1841 | if (channel->band == NL80211_BAND_2GHZ) { | |
1842 | /* | |
1843 | * Better not allow unexpected channels when that could | |
1844 | * be going beyond the 1-11 range (e.g., discovering | |
1845 | * BSS on channel 12 when radio is configured for | |
1846 | * channel 11. | |
1847 | */ | |
1848 | return NULL; | |
1849 | } | |
1850 | ||
1851 | /* No match for the payload channel number - ignore it */ | |
1852 | return channel; | |
1853 | } | |
1854 | ||
1855 | if (scan_width == NL80211_BSS_CHAN_WIDTH_10 || | |
1856 | scan_width == NL80211_BSS_CHAN_WIDTH_5) { | |
1857 | /* | |
1858 | * Ignore channel number in 5 and 10 MHz channels where there | |
1859 | * may not be an n:1 or 1:n mapping between frequencies and | |
1860 | * channel numbers. | |
1861 | */ | |
1862 | return channel; | |
1863 | } | |
1864 | ||
1865 | /* | |
1866 | * Use the channel determined through the payload channel number | |
1867 | * instead of the RX channel reported by the driver. | |
1868 | */ | |
1869 | if (alt_channel->flags & IEEE80211_CHAN_DISABLED) | |
0172bb75 | 1870 | return NULL; |
119f94a6 | 1871 | return alt_channel; |
0172bb75 JB |
1872 | } |
1873 | ||
0e3a39b5 | 1874 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
0b8fb823 PX |
1875 | static struct cfg80211_bss * |
1876 | cfg80211_inform_single_bss_data(struct wiphy *wiphy, | |
1877 | struct cfg80211_inform_bss *data, | |
1878 | enum cfg80211_bss_frame_type ftype, | |
1879 | const u8 *bssid, u64 tsf, u16 capability, | |
1880 | u16 beacon_interval, const u8 *ie, size_t ielen, | |
0cd01efb | 1881 | struct cfg80211_non_tx_bss *non_tx_data, |
0b8fb823 | 1882 | gfp_t gfp) |
06aa7afa | 1883 | { |
0b8fb823 | 1884 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
9caf0364 | 1885 | struct cfg80211_bss_ies *ies; |
3afc2167 | 1886 | struct ieee80211_channel *channel; |
7011ba58 | 1887 | struct cfg80211_internal_bss tmp = {}, *res; |
6eb18137 | 1888 | int bss_type; |
67af9811 | 1889 | bool signal_valid; |
60d7dfea | 1890 | unsigned long ts; |
06aa7afa JK |
1891 | |
1892 | if (WARN_ON(!wiphy)) | |
1893 | return NULL; | |
1894 | ||
22fe88d3 | 1895 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
6e19bc4b | 1896 | (data->signal < 0 || data->signal > 100))) |
06aa7afa JK |
1897 | return NULL; |
1898 | ||
119f94a6 JM |
1899 | channel = cfg80211_get_bss_channel(wiphy, ie, ielen, data->chan, |
1900 | data->scan_width); | |
0172bb75 JB |
1901 | if (!channel) |
1902 | return NULL; | |
1903 | ||
9caf0364 JB |
1904 | memcpy(tmp.pub.bssid, bssid, ETH_ALEN); |
1905 | tmp.pub.channel = channel; | |
6e19bc4b DS |
1906 | tmp.pub.scan_width = data->scan_width; |
1907 | tmp.pub.signal = data->signal; | |
9caf0364 JB |
1908 | tmp.pub.beacon_interval = beacon_interval; |
1909 | tmp.pub.capability = capability; | |
6e19bc4b | 1910 | tmp.ts_boottime = data->boottime_ns; |
b45a19dd IP |
1911 | tmp.parent_tsf = data->parent_tsf; |
1912 | ether_addr_copy(tmp.parent_bssid, data->parent_bssid); | |
1913 | ||
0cd01efb SS |
1914 | if (non_tx_data) { |
1915 | tmp.pub.transmitted_bss = non_tx_data->tx_bss; | |
60d7dfea | 1916 | ts = bss_from_pub(non_tx_data->tx_bss)->ts; |
0cd01efb SS |
1917 | tmp.pub.bssid_index = non_tx_data->bssid_index; |
1918 | tmp.pub.max_bssid_indicator = non_tx_data->max_bssid_indicator; | |
60d7dfea JB |
1919 | } else { |
1920 | ts = jiffies; | |
0cd01efb | 1921 | } |
6e19bc4b | 1922 | |
34a6eddb | 1923 | /* |
5bc8c1f2 | 1924 | * If we do not know here whether the IEs are from a Beacon or Probe |
34a6eddb JM |
1925 | * Response frame, we need to pick one of the options and only use it |
1926 | * with the driver that does not provide the full Beacon/Probe Response | |
1927 | * frame. Use Beacon frame pointer to avoid indicating that this should | |
50521aa8 | 1928 | * override the IEs pointer should we have received an earlier |
9caf0364 | 1929 | * indication of Probe Response data. |
34a6eddb | 1930 | */ |
0e227084 | 1931 | ies = kzalloc(sizeof(*ies) + ielen, gfp); |
9caf0364 JB |
1932 | if (!ies) |
1933 | return NULL; | |
1934 | ies->len = ielen; | |
8cef2c9d | 1935 | ies->tsf = tsf; |
0e227084 | 1936 | ies->from_beacon = false; |
9caf0364 | 1937 | memcpy(ies->data, ie, ielen); |
06aa7afa | 1938 | |
5bc8c1f2 JB |
1939 | switch (ftype) { |
1940 | case CFG80211_BSS_FTYPE_BEACON: | |
1941 | ies->from_beacon = true; | |
7b506ff6 | 1942 | fallthrough; |
5bc8c1f2 JB |
1943 | case CFG80211_BSS_FTYPE_UNKNOWN: |
1944 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); | |
1945 | break; | |
1946 | case CFG80211_BSS_FTYPE_PRESP: | |
1947 | rcu_assign_pointer(tmp.pub.proberesp_ies, ies); | |
1948 | break; | |
1949 | } | |
9caf0364 | 1950 | rcu_assign_pointer(tmp.pub.ies, ies); |
06aa7afa | 1951 | |
7bb106eb | 1952 | signal_valid = data->chan == channel; |
60d7dfea | 1953 | res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid, ts); |
06aa7afa JK |
1954 | if (!res) |
1955 | return NULL; | |
1956 | ||
57fbcce3 | 1957 | if (channel->band == NL80211_BAND_60GHZ) { |
6eb18137 DL |
1958 | bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK; |
1959 | if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP || | |
1960 | bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS) | |
1961 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
1962 | } else { | |
1963 | if (res->pub.capability & WLAN_CAPABILITY_ESS) | |
1964 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
1965 | } | |
06aa7afa | 1966 | |
b0d1d7ff | 1967 | if (non_tx_data) { |
0b8fb823 PX |
1968 | /* this is a nontransmitting bss, we need to add it to |
1969 | * transmitting bss' list if it is not there | |
1970 | */ | |
0cd01efb SS |
1971 | if (cfg80211_add_nontrans_list(non_tx_data->tx_bss, |
1972 | &res->pub)) { | |
0b8fb823 PX |
1973 | if (__cfg80211_unlink_bss(rdev, res)) |
1974 | rdev->bss_generation++; | |
1975 | } | |
1976 | } | |
1977 | ||
4ee3e063 | 1978 | trace_cfg80211_return_bss(&res->pub); |
06aa7afa JK |
1979 | /* cfg80211_bss_update gives us a referenced result */ |
1980 | return &res->pub; | |
1981 | } | |
06aa7afa | 1982 | |
fe806e49 SS |
1983 | static const struct element |
1984 | *cfg80211_get_profile_continuation(const u8 *ie, size_t ielen, | |
1985 | const struct element *mbssid_elem, | |
1986 | const struct element *sub_elem) | |
1987 | { | |
1988 | const u8 *mbssid_end = mbssid_elem->data + mbssid_elem->datalen; | |
1989 | const struct element *next_mbssid; | |
1990 | const struct element *next_sub; | |
1991 | ||
1992 | next_mbssid = cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID, | |
1993 | mbssid_end, | |
1994 | ielen - (mbssid_end - ie)); | |
1995 | ||
1996 | /* | |
8cf5c86d | 1997 | * If it is not the last subelement in current MBSSID IE or there isn't |
fe806e49 SS |
1998 | * a next MBSSID IE - profile is complete. |
1999 | */ | |
2000 | if ((sub_elem->data + sub_elem->datalen < mbssid_end - 1) || | |
2001 | !next_mbssid) | |
2002 | return NULL; | |
2003 | ||
2004 | /* For any length error, just return NULL */ | |
2005 | ||
2006 | if (next_mbssid->datalen < 4) | |
2007 | return NULL; | |
2008 | ||
2009 | next_sub = (void *)&next_mbssid->data[1]; | |
2010 | ||
2011 | if (next_mbssid->data + next_mbssid->datalen < | |
2012 | next_sub->data + next_sub->datalen) | |
2013 | return NULL; | |
2014 | ||
2015 | if (next_sub->id != 0 || next_sub->datalen < 2) | |
2016 | return NULL; | |
2017 | ||
2018 | /* | |
2019 | * Check if the first element in the next sub element is a start | |
2020 | * of a new profile | |
2021 | */ | |
2022 | return next_sub->data[0] == WLAN_EID_NON_TX_BSSID_CAP ? | |
2023 | NULL : next_mbssid; | |
2024 | } | |
2025 | ||
2026 | size_t cfg80211_merge_profile(const u8 *ie, size_t ielen, | |
2027 | const struct element *mbssid_elem, | |
2028 | const struct element *sub_elem, | |
5809a5d5 | 2029 | u8 *merged_ie, size_t max_copy_len) |
fe806e49 SS |
2030 | { |
2031 | size_t copied_len = sub_elem->datalen; | |
2032 | const struct element *next_mbssid; | |
2033 | ||
2034 | if (sub_elem->datalen > max_copy_len) | |
2035 | return 0; | |
2036 | ||
5809a5d5 | 2037 | memcpy(merged_ie, sub_elem->data, sub_elem->datalen); |
fe806e49 SS |
2038 | |
2039 | while ((next_mbssid = cfg80211_get_profile_continuation(ie, ielen, | |
2040 | mbssid_elem, | |
2041 | sub_elem))) { | |
2042 | const struct element *next_sub = (void *)&next_mbssid->data[1]; | |
2043 | ||
2044 | if (copied_len + next_sub->datalen > max_copy_len) | |
2045 | break; | |
5809a5d5 | 2046 | memcpy(merged_ie + copied_len, next_sub->data, |
fe806e49 SS |
2047 | next_sub->datalen); |
2048 | copied_len += next_sub->datalen; | |
2049 | } | |
2050 | ||
2051 | return copied_len; | |
2052 | } | |
2053 | EXPORT_SYMBOL(cfg80211_merge_profile); | |
2054 | ||
0b8fb823 PX |
2055 | static void cfg80211_parse_mbssid_data(struct wiphy *wiphy, |
2056 | struct cfg80211_inform_bss *data, | |
2057 | enum cfg80211_bss_frame_type ftype, | |
2058 | const u8 *bssid, u64 tsf, | |
2059 | u16 beacon_interval, const u8 *ie, | |
2060 | size_t ielen, | |
0cd01efb | 2061 | struct cfg80211_non_tx_bss *non_tx_data, |
0b8fb823 PX |
2062 | gfp_t gfp) |
2063 | { | |
1c8745f3 JB |
2064 | const u8 *mbssid_index_ie; |
2065 | const struct element *elem, *sub; | |
2066 | size_t new_ie_len; | |
0b8fb823 | 2067 | u8 new_bssid[ETH_ALEN]; |
fe806e49 SS |
2068 | u8 *new_ie, *profile; |
2069 | u64 seen_indices = 0; | |
0b8fb823 PX |
2070 | u16 capability; |
2071 | struct cfg80211_bss *bss; | |
2072 | ||
0cd01efb | 2073 | if (!non_tx_data) |
0b8fb823 PX |
2074 | return; |
2075 | if (!cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen)) | |
2076 | return; | |
213ed579 SS |
2077 | if (!wiphy->support_mbssid) |
2078 | return; | |
2079 | if (wiphy->support_only_he_mbssid && | |
2080 | !cfg80211_find_ext_ie(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen)) | |
2081 | return; | |
0b8fb823 | 2082 | |
0b8fb823 PX |
2083 | new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp); |
2084 | if (!new_ie) | |
2085 | return; | |
2086 | ||
fe806e49 SS |
2087 | profile = kmalloc(ielen, gfp); |
2088 | if (!profile) | |
2089 | goto out; | |
2090 | ||
1c8745f3 JB |
2091 | for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, ie, ielen) { |
2092 | if (elem->datalen < 4) | |
2093 | continue; | |
2094 | for_each_element(sub, elem->data + 1, elem->datalen - 1) { | |
fe806e49 SS |
2095 | u8 profile_len; |
2096 | ||
1c8745f3 | 2097 | if (sub->id != 0 || sub->datalen < 4) { |
0b8fb823 PX |
2098 | /* not a valid BSS profile */ |
2099 | continue; | |
2100 | } | |
2101 | ||
1c8745f3 JB |
2102 | if (sub->data[0] != WLAN_EID_NON_TX_BSSID_CAP || |
2103 | sub->data[1] != 2) { | |
0b8fb823 PX |
2104 | /* The first element within the Nontransmitted |
2105 | * BSSID Profile is not the Nontransmitted | |
2106 | * BSSID Capability element. | |
2107 | */ | |
2108 | continue; | |
2109 | } | |
2110 | ||
fe806e49 SS |
2111 | memset(profile, 0, ielen); |
2112 | profile_len = cfg80211_merge_profile(ie, ielen, | |
2113 | elem, | |
2114 | sub, | |
5809a5d5 | 2115 | profile, |
fe806e49 SS |
2116 | ielen); |
2117 | ||
0b8fb823 PX |
2118 | /* found a Nontransmitted BSSID Profile */ |
2119 | mbssid_index_ie = cfg80211_find_ie | |
2120 | (WLAN_EID_MULTI_BSSID_IDX, | |
fe806e49 | 2121 | profile, profile_len); |
0b8fb823 | 2122 | if (!mbssid_index_ie || mbssid_index_ie[1] < 1 || |
fe806e49 SS |
2123 | mbssid_index_ie[2] == 0 || |
2124 | mbssid_index_ie[2] > 46) { | |
0b8fb823 PX |
2125 | /* No valid Multiple BSSID-Index element */ |
2126 | continue; | |
2127 | } | |
2128 | ||
ebb3ca3b | 2129 | if (seen_indices & BIT_ULL(mbssid_index_ie[2])) |
fe806e49 SS |
2130 | /* We don't support legacy split of a profile */ |
2131 | net_dbg_ratelimited("Partial info for BSSID index %d\n", | |
2132 | mbssid_index_ie[2]); | |
2133 | ||
ebb3ca3b | 2134 | seen_indices |= BIT_ULL(mbssid_index_ie[2]); |
fe806e49 | 2135 | |
0cd01efb SS |
2136 | non_tx_data->bssid_index = mbssid_index_ie[2]; |
2137 | non_tx_data->max_bssid_indicator = elem->data[0]; | |
2138 | ||
2139 | cfg80211_gen_new_bssid(bssid, | |
2140 | non_tx_data->max_bssid_indicator, | |
2141 | non_tx_data->bssid_index, | |
0b8fb823 PX |
2142 | new_bssid); |
2143 | memset(new_ie, 0, IEEE80211_MAX_DATA_LEN); | |
fe806e49 SS |
2144 | new_ie_len = cfg80211_gen_new_ie(ie, ielen, |
2145 | profile, | |
2146 | profile_len, new_ie, | |
0b8fb823 PX |
2147 | gfp); |
2148 | if (!new_ie_len) | |
2149 | continue; | |
2150 | ||
fe806e49 | 2151 | capability = get_unaligned_le16(profile + 2); |
0b8fb823 PX |
2152 | bss = cfg80211_inform_single_bss_data(wiphy, data, |
2153 | ftype, | |
2154 | new_bssid, tsf, | |
2155 | capability, | |
2156 | beacon_interval, | |
2157 | new_ie, | |
2158 | new_ie_len, | |
0cd01efb SS |
2159 | non_tx_data, |
2160 | gfp); | |
0b8fb823 PX |
2161 | if (!bss) |
2162 | break; | |
2163 | cfg80211_put_bss(wiphy, bss); | |
2164 | } | |
0b8fb823 PX |
2165 | } |
2166 | ||
fe806e49 | 2167 | out: |
0b8fb823 | 2168 | kfree(new_ie); |
fe806e49 | 2169 | kfree(profile); |
0b8fb823 PX |
2170 | } |
2171 | ||
2a519311 | 2172 | struct cfg80211_bss * |
0b8fb823 PX |
2173 | cfg80211_inform_bss_data(struct wiphy *wiphy, |
2174 | struct cfg80211_inform_bss *data, | |
2175 | enum cfg80211_bss_frame_type ftype, | |
2176 | const u8 *bssid, u64 tsf, u16 capability, | |
2177 | u16 beacon_interval, const u8 *ie, size_t ielen, | |
2178 | gfp_t gfp) | |
2179 | { | |
2180 | struct cfg80211_bss *res; | |
0cd01efb | 2181 | struct cfg80211_non_tx_bss non_tx_data; |
0b8fb823 PX |
2182 | |
2183 | res = cfg80211_inform_single_bss_data(wiphy, data, ftype, bssid, tsf, | |
2184 | capability, beacon_interval, ie, | |
2185 | ielen, NULL, gfp); | |
b0d1d7ff JB |
2186 | if (!res) |
2187 | return NULL; | |
0cd01efb | 2188 | non_tx_data.tx_bss = res; |
0b8fb823 | 2189 | cfg80211_parse_mbssid_data(wiphy, data, ftype, bssid, tsf, |
0cd01efb SS |
2190 | beacon_interval, ie, ielen, &non_tx_data, |
2191 | gfp); | |
0b8fb823 PX |
2192 | return res; |
2193 | } | |
2194 | EXPORT_SYMBOL(cfg80211_inform_bss_data); | |
2195 | ||
2196 | static void | |
2197 | cfg80211_parse_mbssid_frame_data(struct wiphy *wiphy, | |
2198 | struct cfg80211_inform_bss *data, | |
2199 | struct ieee80211_mgmt *mgmt, size_t len, | |
0cd01efb | 2200 | struct cfg80211_non_tx_bss *non_tx_data, |
0b8fb823 PX |
2201 | gfp_t gfp) |
2202 | { | |
2203 | enum cfg80211_bss_frame_type ftype; | |
2204 | const u8 *ie = mgmt->u.probe_resp.variable; | |
2205 | size_t ielen = len - offsetof(struct ieee80211_mgmt, | |
2206 | u.probe_resp.variable); | |
2207 | ||
2208 | ftype = ieee80211_is_beacon(mgmt->frame_control) ? | |
2209 | CFG80211_BSS_FTYPE_BEACON : CFG80211_BSS_FTYPE_PRESP; | |
2210 | ||
2211 | cfg80211_parse_mbssid_data(wiphy, data, ftype, mgmt->bssid, | |
2212 | le64_to_cpu(mgmt->u.probe_resp.timestamp), | |
2213 | le16_to_cpu(mgmt->u.probe_resp.beacon_int), | |
0cd01efb | 2214 | ie, ielen, non_tx_data, gfp); |
0b8fb823 PX |
2215 | } |
2216 | ||
2217 | static void | |
2218 | cfg80211_update_notlisted_nontrans(struct wiphy *wiphy, | |
7011ba58 | 2219 | struct cfg80211_bss *nontrans_bss, |
461c4c2b | 2220 | struct ieee80211_mgmt *mgmt, size_t len) |
0b8fb823 PX |
2221 | { |
2222 | u8 *ie, *new_ie, *pos; | |
2223 | const u8 *nontrans_ssid, *trans_ssid, *mbssid; | |
2224 | size_t ielen = len - offsetof(struct ieee80211_mgmt, | |
2225 | u.probe_resp.variable); | |
2226 | size_t new_ie_len; | |
2227 | struct cfg80211_bss_ies *new_ies; | |
2228 | const struct cfg80211_bss_ies *old; | |
2229 | u8 cpy_len; | |
2230 | ||
461c4c2b SS |
2231 | lockdep_assert_held(&wiphy_to_rdev(wiphy)->bss_lock); |
2232 | ||
0b8fb823 PX |
2233 | ie = mgmt->u.probe_resp.variable; |
2234 | ||
2235 | new_ie_len = ielen; | |
2236 | trans_ssid = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen); | |
2237 | if (!trans_ssid) | |
2238 | return; | |
2239 | new_ie_len -= trans_ssid[1]; | |
2240 | mbssid = cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen); | |
242b0931 JB |
2241 | /* |
2242 | * It's not valid to have the MBSSID element before SSID | |
2243 | * ignore if that happens - the code below assumes it is | |
2244 | * after (while copying things inbetween). | |
2245 | */ | |
2246 | if (!mbssid || mbssid < trans_ssid) | |
0b8fb823 PX |
2247 | return; |
2248 | new_ie_len -= mbssid[1]; | |
461c4c2b | 2249 | |
7011ba58 | 2250 | nontrans_ssid = ieee80211_bss_get_ie(nontrans_bss, WLAN_EID_SSID); |
461c4c2b | 2251 | if (!nontrans_ssid) |
0b8fb823 | 2252 | return; |
461c4c2b | 2253 | |
0b8fb823 | 2254 | new_ie_len += nontrans_ssid[1]; |
0b8fb823 PX |
2255 | |
2256 | /* generate new ie for nontrans BSS | |
2257 | * 1. replace SSID with nontrans BSS' SSID | |
2258 | * 2. skip MBSSID IE | |
2259 | */ | |
461c4c2b | 2260 | new_ie = kzalloc(new_ie_len, GFP_ATOMIC); |
0b8fb823 PX |
2261 | if (!new_ie) |
2262 | return; | |
461c4c2b SS |
2263 | |
2264 | new_ies = kzalloc(sizeof(*new_ies) + new_ie_len, GFP_ATOMIC); | |
bede8d29 SS |
2265 | if (!new_ies) |
2266 | goto out_free; | |
0b8fb823 PX |
2267 | |
2268 | pos = new_ie; | |
2269 | ||
2270 | /* copy the nontransmitted SSID */ | |
2271 | cpy_len = nontrans_ssid[1] + 2; | |
2272 | memcpy(pos, nontrans_ssid, cpy_len); | |
2273 | pos += cpy_len; | |
2274 | /* copy the IEs between SSID and MBSSID */ | |
2275 | cpy_len = trans_ssid[1] + 2; | |
2276 | memcpy(pos, (trans_ssid + cpy_len), (mbssid - (trans_ssid + cpy_len))); | |
2277 | pos += (mbssid - (trans_ssid + cpy_len)); | |
2278 | /* copy the IEs after MBSSID */ | |
2279 | cpy_len = mbssid[1] + 2; | |
2280 | memcpy(pos, mbssid + cpy_len, ((ie + ielen) - (mbssid + cpy_len))); | |
2281 | ||
2282 | /* update ie */ | |
2283 | new_ies->len = new_ie_len; | |
2284 | new_ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); | |
2285 | new_ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control); | |
2286 | memcpy(new_ies->data, new_ie, new_ie_len); | |
2287 | if (ieee80211_is_probe_resp(mgmt->frame_control)) { | |
7011ba58 SS |
2288 | old = rcu_access_pointer(nontrans_bss->proberesp_ies); |
2289 | rcu_assign_pointer(nontrans_bss->proberesp_ies, new_ies); | |
2290 | rcu_assign_pointer(nontrans_bss->ies, new_ies); | |
0b8fb823 PX |
2291 | if (old) |
2292 | kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head); | |
2293 | } else { | |
7011ba58 SS |
2294 | old = rcu_access_pointer(nontrans_bss->beacon_ies); |
2295 | rcu_assign_pointer(nontrans_bss->beacon_ies, new_ies); | |
2296 | rcu_assign_pointer(nontrans_bss->ies, new_ies); | |
0b8fb823 PX |
2297 | if (old) |
2298 | kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head); | |
2299 | } | |
bede8d29 SS |
2300 | |
2301 | out_free: | |
2302 | kfree(new_ie); | |
0b8fb823 | 2303 | } |
6e19bc4b | 2304 | |
0b8fb823 PX |
2305 | /* cfg80211_inform_bss_width_frame helper */ |
2306 | static struct cfg80211_bss * | |
2307 | cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy, | |
2308 | struct cfg80211_inform_bss *data, | |
2309 | struct ieee80211_mgmt *mgmt, size_t len, | |
0b8fb823 | 2310 | gfp_t gfp) |
2a519311 | 2311 | { |
9caf0364 JB |
2312 | struct cfg80211_internal_bss tmp = {}, *res; |
2313 | struct cfg80211_bss_ies *ies; | |
3afc2167 | 2314 | struct ieee80211_channel *channel; |
67af9811 | 2315 | bool signal_valid; |
9eaffe50 TP |
2316 | struct ieee80211_ext *ext = NULL; |
2317 | u8 *bssid, *variable; | |
2318 | u16 capability, beacon_int; | |
2319 | size_t ielen, min_hdr_len = offsetof(struct ieee80211_mgmt, | |
2320 | u.probe_resp.variable); | |
6eb18137 | 2321 | int bss_type; |
bef9bacc | 2322 | |
0172bb75 JB |
2323 | BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) != |
2324 | offsetof(struct ieee80211_mgmt, u.beacon.variable)); | |
2325 | ||
6e19bc4b | 2326 | trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len); |
4ee3e063 | 2327 | |
bef9bacc MK |
2328 | if (WARN_ON(!mgmt)) |
2329 | return NULL; | |
2330 | ||
2331 | if (WARN_ON(!wiphy)) | |
2332 | return NULL; | |
2a519311 | 2333 | |
22fe88d3 | 2334 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
6e19bc4b | 2335 | (data->signal < 0 || data->signal > 100))) |
2a519311 JB |
2336 | return NULL; |
2337 | ||
9eaffe50 TP |
2338 | if (ieee80211_is_s1g_beacon(mgmt->frame_control)) { |
2339 | ext = (void *) mgmt; | |
2340 | min_hdr_len = offsetof(struct ieee80211_ext, u.s1g_beacon); | |
2341 | if (ieee80211_is_s1g_short_beacon(mgmt->frame_control)) | |
2342 | min_hdr_len = offsetof(struct ieee80211_ext, | |
2343 | u.s1g_short_beacon.variable); | |
2344 | } | |
2345 | ||
2346 | if (WARN_ON(len < min_hdr_len)) | |
2a519311 JB |
2347 | return NULL; |
2348 | ||
9eaffe50 TP |
2349 | ielen = len - min_hdr_len; |
2350 | variable = mgmt->u.probe_resp.variable; | |
2351 | if (ext) { | |
2352 | if (ieee80211_is_s1g_short_beacon(mgmt->frame_control)) | |
2353 | variable = ext->u.s1g_short_beacon.variable; | |
2354 | else | |
2355 | variable = ext->u.s1g_beacon.variable; | |
2356 | } | |
2357 | ||
2358 | channel = cfg80211_get_bss_channel(wiphy, variable, | |
119f94a6 | 2359 | ielen, data->chan, data->scan_width); |
0172bb75 JB |
2360 | if (!channel) |
2361 | return NULL; | |
2362 | ||
9eaffe50 | 2363 | if (ext) { |
b5ac0146 JB |
2364 | const struct ieee80211_s1g_bcn_compat_ie *compat; |
2365 | const struct element *elem; | |
9eaffe50 | 2366 | |
b5ac0146 JB |
2367 | elem = cfg80211_find_elem(WLAN_EID_S1G_BCN_COMPAT, |
2368 | variable, ielen); | |
2369 | if (!elem) | |
2370 | return NULL; | |
2371 | if (elem->datalen < sizeof(*compat)) | |
9eaffe50 | 2372 | return NULL; |
b5ac0146 | 2373 | compat = (void *)elem->data; |
9eaffe50 TP |
2374 | bssid = ext->u.s1g_beacon.sa; |
2375 | capability = le16_to_cpu(compat->compat_info); | |
2376 | beacon_int = le16_to_cpu(compat->beacon_int); | |
2377 | } else { | |
2378 | bssid = mgmt->bssid; | |
2379 | beacon_int = le16_to_cpu(mgmt->u.probe_resp.beacon_int); | |
2380 | capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); | |
2381 | } | |
2382 | ||
0e227084 | 2383 | ies = kzalloc(sizeof(*ies) + ielen, gfp); |
9caf0364 | 2384 | if (!ies) |
2a519311 | 2385 | return NULL; |
9caf0364 | 2386 | ies->len = ielen; |
8cef2c9d | 2387 | ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); |
9eaffe50 TP |
2388 | ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control) || |
2389 | ieee80211_is_s1g_beacon(mgmt->frame_control); | |
2390 | memcpy(ies->data, variable, ielen); | |
2a519311 | 2391 | |
9caf0364 JB |
2392 | if (ieee80211_is_probe_resp(mgmt->frame_control)) |
2393 | rcu_assign_pointer(tmp.pub.proberesp_ies, ies); | |
2394 | else | |
2395 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); | |
2396 | rcu_assign_pointer(tmp.pub.ies, ies); | |
505a2e88 | 2397 | |
9eaffe50 TP |
2398 | memcpy(tmp.pub.bssid, bssid, ETH_ALEN); |
2399 | tmp.pub.beacon_interval = beacon_int; | |
2400 | tmp.pub.capability = capability; | |
9caf0364 | 2401 | tmp.pub.channel = channel; |
6e19bc4b DS |
2402 | tmp.pub.scan_width = data->scan_width; |
2403 | tmp.pub.signal = data->signal; | |
6e19bc4b | 2404 | tmp.ts_boottime = data->boottime_ns; |
1d76250b | 2405 | tmp.parent_tsf = data->parent_tsf; |
983dafaa SD |
2406 | tmp.pub.chains = data->chains; |
2407 | memcpy(tmp.pub.chain_signal, data->chain_signal, IEEE80211_MAX_CHAINS); | |
1d76250b | 2408 | ether_addr_copy(tmp.parent_bssid, data->parent_bssid); |
9caf0364 | 2409 | |
7bb106eb | 2410 | signal_valid = data->chan == channel; |
a3ce17d1 CT |
2411 | res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid, |
2412 | jiffies); | |
2a519311 JB |
2413 | if (!res) |
2414 | return NULL; | |
2415 | ||
57fbcce3 | 2416 | if (channel->band == NL80211_BAND_60GHZ) { |
6eb18137 DL |
2417 | bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK; |
2418 | if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP || | |
2419 | bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS) | |
2420 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
2421 | } else { | |
2422 | if (res->pub.capability & WLAN_CAPABILITY_ESS) | |
2423 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
2424 | } | |
e38f8a7a | 2425 | |
4ee3e063 | 2426 | trace_cfg80211_return_bss(&res->pub); |
2a519311 JB |
2427 | /* cfg80211_bss_update gives us a referenced result */ |
2428 | return &res->pub; | |
2429 | } | |
0b8fb823 PX |
2430 | |
2431 | struct cfg80211_bss * | |
2432 | cfg80211_inform_bss_frame_data(struct wiphy *wiphy, | |
2433 | struct cfg80211_inform_bss *data, | |
2434 | struct ieee80211_mgmt *mgmt, size_t len, | |
2435 | gfp_t gfp) | |
2436 | { | |
7011ba58 | 2437 | struct cfg80211_bss *res, *tmp_bss; |
0b8fb823 PX |
2438 | const u8 *ie = mgmt->u.probe_resp.variable; |
2439 | const struct cfg80211_bss_ies *ies1, *ies2; | |
2440 | size_t ielen = len - offsetof(struct ieee80211_mgmt, | |
2441 | u.probe_resp.variable); | |
0cd01efb | 2442 | struct cfg80211_non_tx_bss non_tx_data; |
0b8fb823 PX |
2443 | |
2444 | res = cfg80211_inform_single_bss_frame_data(wiphy, data, mgmt, | |
84f1772b | 2445 | len, gfp); |
213ed579 SS |
2446 | if (!res || !wiphy->support_mbssid || |
2447 | !cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen)) | |
2448 | return res; | |
2449 | if (wiphy->support_only_he_mbssid && | |
2450 | !cfg80211_find_ext_ie(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen)) | |
0b8fb823 PX |
2451 | return res; |
2452 | ||
0cd01efb | 2453 | non_tx_data.tx_bss = res; |
0b8fb823 | 2454 | /* process each non-transmitting bss */ |
0cd01efb SS |
2455 | cfg80211_parse_mbssid_frame_data(wiphy, data, mgmt, len, |
2456 | &non_tx_data, gfp); | |
0b8fb823 | 2457 | |
461c4c2b SS |
2458 | spin_lock_bh(&wiphy_to_rdev(wiphy)->bss_lock); |
2459 | ||
0b8fb823 PX |
2460 | /* check if the res has other nontransmitting bss which is not |
2461 | * in MBSSID IE | |
2462 | */ | |
2463 | ies1 = rcu_access_pointer(res->ies); | |
0b8fb823 PX |
2464 | |
2465 | /* go through nontrans_list, if the timestamp of the BSS is | |
2466 | * earlier than the timestamp of the transmitting BSS then | |
2467 | * update it | |
2468 | */ | |
7011ba58 | 2469 | list_for_each_entry(tmp_bss, &res->nontrans_list, |
0b8fb823 | 2470 | nontrans_list) { |
7011ba58 | 2471 | ies2 = rcu_access_pointer(tmp_bss->ies); |
0b8fb823 PX |
2472 | if (ies2->tsf < ies1->tsf) |
2473 | cfg80211_update_notlisted_nontrans(wiphy, tmp_bss, | |
461c4c2b | 2474 | mgmt, len); |
0b8fb823 | 2475 | } |
461c4c2b | 2476 | spin_unlock_bh(&wiphy_to_rdev(wiphy)->bss_lock); |
0b8fb823 PX |
2477 | |
2478 | return res; | |
2479 | } | |
6e19bc4b | 2480 | EXPORT_SYMBOL(cfg80211_inform_bss_frame_data); |
2a519311 | 2481 | |
5b112d3d | 2482 | void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
4c0c0b75 | 2483 | { |
f26cbf40 | 2484 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
4c0c0b75 JB |
2485 | struct cfg80211_internal_bss *bss; |
2486 | ||
2487 | if (!pub) | |
2488 | return; | |
2489 | ||
2490 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
776b3580 | 2491 | |
1b8ec87a ZG |
2492 | spin_lock_bh(&rdev->bss_lock); |
2493 | bss_ref_get(rdev, bss); | |
2494 | spin_unlock_bh(&rdev->bss_lock); | |
4c0c0b75 JB |
2495 | } |
2496 | EXPORT_SYMBOL(cfg80211_ref_bss); | |
2497 | ||
5b112d3d | 2498 | void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
2a519311 | 2499 | { |
f26cbf40 | 2500 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
2a519311 JB |
2501 | struct cfg80211_internal_bss *bss; |
2502 | ||
2503 | if (!pub) | |
2504 | return; | |
2505 | ||
2506 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
776b3580 | 2507 | |
1b8ec87a ZG |
2508 | spin_lock_bh(&rdev->bss_lock); |
2509 | bss_ref_put(rdev, bss); | |
2510 | spin_unlock_bh(&rdev->bss_lock); | |
2a519311 JB |
2511 | } |
2512 | EXPORT_SYMBOL(cfg80211_put_bss); | |
2513 | ||
d491af19 JB |
2514 | void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
2515 | { | |
f26cbf40 | 2516 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
7011ba58 SS |
2517 | struct cfg80211_internal_bss *bss, *tmp1; |
2518 | struct cfg80211_bss *nontrans_bss, *tmp; | |
d491af19 JB |
2519 | |
2520 | if (WARN_ON(!pub)) | |
2521 | return; | |
2522 | ||
2523 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
2524 | ||
1b8ec87a | 2525 | spin_lock_bh(&rdev->bss_lock); |
7011ba58 SS |
2526 | if (list_empty(&bss->list)) |
2527 | goto out; | |
2528 | ||
2529 | list_for_each_entry_safe(nontrans_bss, tmp, | |
2530 | &pub->nontrans_list, | |
2531 | nontrans_list) { | |
2532 | tmp1 = container_of(nontrans_bss, | |
2533 | struct cfg80211_internal_bss, pub); | |
2534 | if (__cfg80211_unlink_bss(rdev, tmp1)) | |
1b8ec87a | 2535 | rdev->bss_generation++; |
3207390a | 2536 | } |
7011ba58 SS |
2537 | |
2538 | if (__cfg80211_unlink_bss(rdev, bss)) | |
2539 | rdev->bss_generation++; | |
2540 | out: | |
1b8ec87a | 2541 | spin_unlock_bh(&rdev->bss_lock); |
d491af19 JB |
2542 | } |
2543 | EXPORT_SYMBOL(cfg80211_unlink_bss); | |
2544 | ||
4770c8f9 IP |
2545 | void cfg80211_bss_iter(struct wiphy *wiphy, |
2546 | struct cfg80211_chan_def *chandef, | |
2547 | void (*iter)(struct wiphy *wiphy, | |
2548 | struct cfg80211_bss *bss, | |
2549 | void *data), | |
2550 | void *iter_data) | |
2551 | { | |
2552 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); | |
2553 | struct cfg80211_internal_bss *bss; | |
2554 | ||
2555 | spin_lock_bh(&rdev->bss_lock); | |
2556 | ||
2557 | list_for_each_entry(bss, &rdev->bss_list, list) { | |
2558 | if (!chandef || cfg80211_is_sub_chan(chandef, bss->pub.channel)) | |
2559 | iter(wiphy, &bss->pub, iter_data); | |
2560 | } | |
2561 | ||
2562 | spin_unlock_bh(&rdev->bss_lock); | |
2563 | } | |
2564 | EXPORT_SYMBOL(cfg80211_bss_iter); | |
2565 | ||
0afd425b SM |
2566 | void cfg80211_update_assoc_bss_entry(struct wireless_dev *wdev, |
2567 | struct ieee80211_channel *chan) | |
2568 | { | |
2569 | struct wiphy *wiphy = wdev->wiphy; | |
2570 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); | |
2571 | struct cfg80211_internal_bss *cbss = wdev->current_bss; | |
2572 | struct cfg80211_internal_bss *new = NULL; | |
2573 | struct cfg80211_internal_bss *bss; | |
2574 | struct cfg80211_bss *nontrans_bss; | |
2575 | struct cfg80211_bss *tmp; | |
2576 | ||
2577 | spin_lock_bh(&rdev->bss_lock); | |
2578 | ||
05dcb8bb IP |
2579 | /* |
2580 | * Some APs use CSA also for bandwidth changes, i.e., without actually | |
2581 | * changing the control channel, so no need to update in such a case. | |
2582 | */ | |
2583 | if (cbss->pub.channel == chan) | |
0afd425b SM |
2584 | goto done; |
2585 | ||
2586 | /* use transmitting bss */ | |
2587 | if (cbss->pub.transmitted_bss) | |
2588 | cbss = container_of(cbss->pub.transmitted_bss, | |
2589 | struct cfg80211_internal_bss, | |
2590 | pub); | |
2591 | ||
2592 | cbss->pub.channel = chan; | |
2593 | ||
2594 | list_for_each_entry(bss, &rdev->bss_list, list) { | |
2595 | if (!cfg80211_bss_type_match(bss->pub.capability, | |
2596 | bss->pub.channel->band, | |
2597 | wdev->conn_bss_type)) | |
2598 | continue; | |
2599 | ||
2600 | if (bss == cbss) | |
2601 | continue; | |
2602 | ||
2603 | if (!cmp_bss(&bss->pub, &cbss->pub, BSS_CMP_REGULAR)) { | |
2604 | new = bss; | |
2605 | break; | |
2606 | } | |
2607 | } | |
2608 | ||
2609 | if (new) { | |
2610 | /* to save time, update IEs for transmitting bss only */ | |
2611 | if (cfg80211_update_known_bss(rdev, cbss, new, false)) { | |
2612 | new->pub.proberesp_ies = NULL; | |
2613 | new->pub.beacon_ies = NULL; | |
2614 | } | |
2615 | ||
2616 | list_for_each_entry_safe(nontrans_bss, tmp, | |
2617 | &new->pub.nontrans_list, | |
2618 | nontrans_list) { | |
2619 | bss = container_of(nontrans_bss, | |
2620 | struct cfg80211_internal_bss, pub); | |
2621 | if (__cfg80211_unlink_bss(rdev, bss)) | |
2622 | rdev->bss_generation++; | |
2623 | } | |
2624 | ||
2625 | WARN_ON(atomic_read(&new->hold)); | |
2626 | if (!WARN_ON(!__cfg80211_unlink_bss(rdev, new))) | |
2627 | rdev->bss_generation++; | |
2628 | } | |
2629 | ||
2630 | rb_erase(&cbss->rbn, &rdev->bss_tree); | |
2631 | rb_insert_bss(rdev, cbss); | |
2632 | rdev->bss_generation++; | |
2633 | ||
2634 | list_for_each_entry_safe(nontrans_bss, tmp, | |
2635 | &cbss->pub.nontrans_list, | |
2636 | nontrans_list) { | |
2637 | bss = container_of(nontrans_bss, | |
2638 | struct cfg80211_internal_bss, pub); | |
2639 | bss->pub.channel = chan; | |
2640 | rb_erase(&bss->rbn, &rdev->bss_tree); | |
2641 | rb_insert_bss(rdev, bss); | |
2642 | rdev->bss_generation++; | |
2643 | } | |
2644 | ||
2645 | done: | |
2646 | spin_unlock_bh(&rdev->bss_lock); | |
2647 | } | |
2648 | ||
3d23e349 | 2649 | #ifdef CONFIG_CFG80211_WEXT |
9f419f38 JB |
2650 | static struct cfg80211_registered_device * |
2651 | cfg80211_get_dev_from_ifindex(struct net *net, int ifindex) | |
2652 | { | |
5fe231e8 | 2653 | struct cfg80211_registered_device *rdev; |
9f419f38 JB |
2654 | struct net_device *dev; |
2655 | ||
5fe231e8 JB |
2656 | ASSERT_RTNL(); |
2657 | ||
9f419f38 JB |
2658 | dev = dev_get_by_index(net, ifindex); |
2659 | if (!dev) | |
5fe231e8 JB |
2660 | return ERR_PTR(-ENODEV); |
2661 | if (dev->ieee80211_ptr) | |
f26cbf40 | 2662 | rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy); |
5fe231e8 | 2663 | else |
9f419f38 JB |
2664 | rdev = ERR_PTR(-ENODEV); |
2665 | dev_put(dev); | |
9f419f38 JB |
2666 | return rdev; |
2667 | } | |
2668 | ||
2a519311 JB |
2669 | int cfg80211_wext_siwscan(struct net_device *dev, |
2670 | struct iw_request_info *info, | |
2671 | union iwreq_data *wrqu, char *extra) | |
2672 | { | |
2673 | struct cfg80211_registered_device *rdev; | |
2674 | struct wiphy *wiphy; | |
2675 | struct iw_scan_req *wreq = NULL; | |
65486c8b | 2676 | struct cfg80211_scan_request *creq = NULL; |
2a519311 | 2677 | int i, err, n_channels = 0; |
57fbcce3 | 2678 | enum nl80211_band band; |
2a519311 JB |
2679 | |
2680 | if (!netif_running(dev)) | |
2681 | return -ENETDOWN; | |
2682 | ||
b2e3abdc HS |
2683 | if (wrqu->data.length == sizeof(struct iw_scan_req)) |
2684 | wreq = (struct iw_scan_req *)extra; | |
2685 | ||
463d0183 | 2686 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
2687 | |
2688 | if (IS_ERR(rdev)) | |
2689 | return PTR_ERR(rdev); | |
2690 | ||
f9d15d16 | 2691 | if (rdev->scan_req || rdev->scan_msg) { |
2a519311 JB |
2692 | err = -EBUSY; |
2693 | goto out; | |
2694 | } | |
2695 | ||
2696 | wiphy = &rdev->wiphy; | |
2697 | ||
b2e3abdc HS |
2698 | /* Determine number of channels, needed to allocate creq */ |
2699 | if (wreq && wreq->num_channels) | |
2700 | n_channels = wreq->num_channels; | |
bdfbec2d IP |
2701 | else |
2702 | n_channels = ieee80211_get_num_supported_channels(wiphy); | |
2a519311 JB |
2703 | |
2704 | creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + | |
2705 | n_channels * sizeof(void *), | |
2706 | GFP_ATOMIC); | |
2707 | if (!creq) { | |
2708 | err = -ENOMEM; | |
2709 | goto out; | |
2710 | } | |
2711 | ||
2712 | creq->wiphy = wiphy; | |
fd014284 | 2713 | creq->wdev = dev->ieee80211_ptr; |
5ba63533 JB |
2714 | /* SSIDs come after channels */ |
2715 | creq->ssids = (void *)&creq->channels[n_channels]; | |
2a519311 JB |
2716 | creq->n_channels = n_channels; |
2717 | creq->n_ssids = 1; | |
15d6030b | 2718 | creq->scan_start = jiffies; |
2a519311 | 2719 | |
b2e3abdc | 2720 | /* translate "Scan on frequencies" request */ |
2a519311 | 2721 | i = 0; |
57fbcce3 | 2722 | for (band = 0; band < NUM_NL80211_BANDS; band++) { |
2a519311 | 2723 | int j; |
584991dc | 2724 | |
2a519311 JB |
2725 | if (!wiphy->bands[band]) |
2726 | continue; | |
584991dc | 2727 | |
2a519311 | 2728 | for (j = 0; j < wiphy->bands[band]->n_channels; j++) { |
584991dc JB |
2729 | /* ignore disabled channels */ |
2730 | if (wiphy->bands[band]->channels[j].flags & | |
2731 | IEEE80211_CHAN_DISABLED) | |
2732 | continue; | |
b2e3abdc HS |
2733 | |
2734 | /* If we have a wireless request structure and the | |
2735 | * wireless request specifies frequencies, then search | |
2736 | * for the matching hardware channel. | |
2737 | */ | |
2738 | if (wreq && wreq->num_channels) { | |
2739 | int k; | |
2740 | int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; | |
2741 | for (k = 0; k < wreq->num_channels; k++) { | |
96998e3a ZG |
2742 | struct iw_freq *freq = |
2743 | &wreq->channel_list[k]; | |
2744 | int wext_freq = | |
2745 | cfg80211_wext_freq(freq); | |
2746 | ||
b2e3abdc HS |
2747 | if (wext_freq == wiphy_freq) |
2748 | goto wext_freq_found; | |
2749 | } | |
2750 | goto wext_freq_not_found; | |
2751 | } | |
2752 | ||
2753 | wext_freq_found: | |
2a519311 JB |
2754 | creq->channels[i] = &wiphy->bands[band]->channels[j]; |
2755 | i++; | |
b2e3abdc | 2756 | wext_freq_not_found: ; |
2a519311 JB |
2757 | } |
2758 | } | |
8862dc5f HS |
2759 | /* No channels found? */ |
2760 | if (!i) { | |
2761 | err = -EINVAL; | |
2762 | goto out; | |
2763 | } | |
2a519311 | 2764 | |
b2e3abdc HS |
2765 | /* Set real number of channels specified in creq->channels[] */ |
2766 | creq->n_channels = i; | |
2a519311 | 2767 | |
b2e3abdc HS |
2768 | /* translate "Scan for SSID" request */ |
2769 | if (wreq) { | |
2a519311 | 2770 | if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { |
65486c8b JB |
2771 | if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { |
2772 | err = -EINVAL; | |
2773 | goto out; | |
2774 | } | |
2a519311 JB |
2775 | memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); |
2776 | creq->ssids[0].ssid_len = wreq->essid_len; | |
2777 | } | |
2778 | if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) | |
2779 | creq->n_ssids = 0; | |
2780 | } | |
2781 | ||
57fbcce3 | 2782 | for (i = 0; i < NUM_NL80211_BANDS; i++) |
a401d2bb JB |
2783 | if (wiphy->bands[i]) |
2784 | creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1; | |
34850ab2 | 2785 | |
818965d3 JM |
2786 | eth_broadcast_addr(creq->bssid); |
2787 | ||
a05829a7 JB |
2788 | wiphy_lock(&rdev->wiphy); |
2789 | ||
2a519311 | 2790 | rdev->scan_req = creq; |
e35e4d28 | 2791 | err = rdev_scan(rdev, creq); |
2a519311 JB |
2792 | if (err) { |
2793 | rdev->scan_req = NULL; | |
65486c8b | 2794 | /* creq will be freed below */ |
463d0183 | 2795 | } else { |
fd014284 | 2796 | nl80211_send_scan_start(rdev, dev->ieee80211_ptr); |
65486c8b JB |
2797 | /* creq now owned by driver */ |
2798 | creq = NULL; | |
463d0183 JB |
2799 | dev_hold(dev); |
2800 | } | |
a05829a7 | 2801 | wiphy_unlock(&rdev->wiphy); |
2a519311 | 2802 | out: |
65486c8b | 2803 | kfree(creq); |
2a519311 JB |
2804 | return err; |
2805 | } | |
2afe38d1 | 2806 | EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan); |
2a519311 | 2807 | |
76a70e9c JM |
2808 | static char *ieee80211_scan_add_ies(struct iw_request_info *info, |
2809 | const struct cfg80211_bss_ies *ies, | |
2810 | char *current_ev, char *end_buf) | |
2a519311 | 2811 | { |
9caf0364 | 2812 | const u8 *pos, *end, *next; |
2a519311 JB |
2813 | struct iw_event iwe; |
2814 | ||
9caf0364 | 2815 | if (!ies) |
76a70e9c | 2816 | return current_ev; |
2a519311 JB |
2817 | |
2818 | /* | |
2819 | * If needed, fragment the IEs buffer (at IE boundaries) into short | |
2820 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. | |
2821 | */ | |
9caf0364 JB |
2822 | pos = ies->data; |
2823 | end = pos + ies->len; | |
2a519311 JB |
2824 | |
2825 | while (end - pos > IW_GENERIC_IE_MAX) { | |
2826 | next = pos + 2 + pos[1]; | |
2827 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) | |
2828 | next = next + 2 + next[1]; | |
2829 | ||
2830 | memset(&iwe, 0, sizeof(iwe)); | |
2831 | iwe.cmd = IWEVGENIE; | |
2832 | iwe.u.data.length = next - pos; | |
76a70e9c JM |
2833 | current_ev = iwe_stream_add_point_check(info, current_ev, |
2834 | end_buf, &iwe, | |
2835 | (void *)pos); | |
2836 | if (IS_ERR(current_ev)) | |
2837 | return current_ev; | |
2a519311 JB |
2838 | pos = next; |
2839 | } | |
2840 | ||
2841 | if (end > pos) { | |
2842 | memset(&iwe, 0, sizeof(iwe)); | |
2843 | iwe.cmd = IWEVGENIE; | |
2844 | iwe.u.data.length = end - pos; | |
76a70e9c JM |
2845 | current_ev = iwe_stream_add_point_check(info, current_ev, |
2846 | end_buf, &iwe, | |
2847 | (void *)pos); | |
2848 | if (IS_ERR(current_ev)) | |
2849 | return current_ev; | |
2a519311 | 2850 | } |
76a70e9c JM |
2851 | |
2852 | return current_ev; | |
2a519311 JB |
2853 | } |
2854 | ||
2a519311 | 2855 | static char * |
77965c97 JB |
2856 | ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, |
2857 | struct cfg80211_internal_bss *bss, char *current_ev, | |
2858 | char *end_buf) | |
2a519311 | 2859 | { |
9caf0364 | 2860 | const struct cfg80211_bss_ies *ies; |
2a519311 | 2861 | struct iw_event iwe; |
9caf0364 | 2862 | const u8 *ie; |
76a70e9c JM |
2863 | u8 buf[50]; |
2864 | u8 *cfg, *p, *tmp; | |
9caf0364 | 2865 | int rem, i, sig; |
2a519311 JB |
2866 | bool ismesh = false; |
2867 | ||
2868 | memset(&iwe, 0, sizeof(iwe)); | |
2869 | iwe.cmd = SIOCGIWAP; | |
2870 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; | |
2871 | memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); | |
76a70e9c JM |
2872 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
2873 | IW_EV_ADDR_LEN); | |
2874 | if (IS_ERR(current_ev)) | |
2875 | return current_ev; | |
2a519311 JB |
2876 | |
2877 | memset(&iwe, 0, sizeof(iwe)); | |
2878 | iwe.cmd = SIOCGIWFREQ; | |
2879 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); | |
2880 | iwe.u.freq.e = 0; | |
76a70e9c JM |
2881 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
2882 | IW_EV_FREQ_LEN); | |
2883 | if (IS_ERR(current_ev)) | |
2884 | return current_ev; | |
2a519311 JB |
2885 | |
2886 | memset(&iwe, 0, sizeof(iwe)); | |
2887 | iwe.cmd = SIOCGIWFREQ; | |
2888 | iwe.u.freq.m = bss->pub.channel->center_freq; | |
2889 | iwe.u.freq.e = 6; | |
76a70e9c JM |
2890 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
2891 | IW_EV_FREQ_LEN); | |
2892 | if (IS_ERR(current_ev)) | |
2893 | return current_ev; | |
2a519311 | 2894 | |
77965c97 | 2895 | if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { |
2a519311 JB |
2896 | memset(&iwe, 0, sizeof(iwe)); |
2897 | iwe.cmd = IWEVQUAL; | |
2898 | iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | | |
2899 | IW_QUAL_NOISE_INVALID | | |
a77b8552 | 2900 | IW_QUAL_QUAL_UPDATED; |
77965c97 | 2901 | switch (wiphy->signal_type) { |
2a519311 | 2902 | case CFG80211_SIGNAL_TYPE_MBM: |
a77b8552 JB |
2903 | sig = bss->pub.signal / 100; |
2904 | iwe.u.qual.level = sig; | |
2a519311 | 2905 | iwe.u.qual.updated |= IW_QUAL_DBM; |
a77b8552 JB |
2906 | if (sig < -110) /* rather bad */ |
2907 | sig = -110; | |
2908 | else if (sig > -40) /* perfect */ | |
2909 | sig = -40; | |
2910 | /* will give a range of 0 .. 70 */ | |
2911 | iwe.u.qual.qual = sig + 110; | |
2a519311 JB |
2912 | break; |
2913 | case CFG80211_SIGNAL_TYPE_UNSPEC: | |
2914 | iwe.u.qual.level = bss->pub.signal; | |
a77b8552 JB |
2915 | /* will give range 0 .. 100 */ |
2916 | iwe.u.qual.qual = bss->pub.signal; | |
2a519311 JB |
2917 | break; |
2918 | default: | |
2919 | /* not reached */ | |
2920 | break; | |
2921 | } | |
76a70e9c JM |
2922 | current_ev = iwe_stream_add_event_check(info, current_ev, |
2923 | end_buf, &iwe, | |
2924 | IW_EV_QUAL_LEN); | |
2925 | if (IS_ERR(current_ev)) | |
2926 | return current_ev; | |
2a519311 JB |
2927 | } |
2928 | ||
2929 | memset(&iwe, 0, sizeof(iwe)); | |
2930 | iwe.cmd = SIOCGIWENCODE; | |
2931 | if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) | |
2932 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; | |
2933 | else | |
2934 | iwe.u.data.flags = IW_ENCODE_DISABLED; | |
2935 | iwe.u.data.length = 0; | |
76a70e9c JM |
2936 | current_ev = iwe_stream_add_point_check(info, current_ev, end_buf, |
2937 | &iwe, ""); | |
2938 | if (IS_ERR(current_ev)) | |
2939 | return current_ev; | |
2a519311 | 2940 | |
9caf0364 JB |
2941 | rcu_read_lock(); |
2942 | ies = rcu_dereference(bss->pub.ies); | |
83c7aa1a JB |
2943 | rem = ies->len; |
2944 | ie = ies->data; | |
9caf0364 | 2945 | |
83c7aa1a | 2946 | while (rem >= 2) { |
2a519311 JB |
2947 | /* invalid data */ |
2948 | if (ie[1] > rem - 2) | |
2949 | break; | |
2950 | ||
2951 | switch (ie[0]) { | |
2952 | case WLAN_EID_SSID: | |
2953 | memset(&iwe, 0, sizeof(iwe)); | |
2954 | iwe.cmd = SIOCGIWESSID; | |
2955 | iwe.u.data.length = ie[1]; | |
2956 | iwe.u.data.flags = 1; | |
76a70e9c JM |
2957 | current_ev = iwe_stream_add_point_check(info, |
2958 | current_ev, | |
2959 | end_buf, &iwe, | |
2960 | (u8 *)ie + 2); | |
2961 | if (IS_ERR(current_ev)) | |
2962 | goto unlock; | |
2a519311 JB |
2963 | break; |
2964 | case WLAN_EID_MESH_ID: | |
2965 | memset(&iwe, 0, sizeof(iwe)); | |
2966 | iwe.cmd = SIOCGIWESSID; | |
2967 | iwe.u.data.length = ie[1]; | |
2968 | iwe.u.data.flags = 1; | |
76a70e9c JM |
2969 | current_ev = iwe_stream_add_point_check(info, |
2970 | current_ev, | |
2971 | end_buf, &iwe, | |
2972 | (u8 *)ie + 2); | |
2973 | if (IS_ERR(current_ev)) | |
2974 | goto unlock; | |
2a519311 JB |
2975 | break; |
2976 | case WLAN_EID_MESH_CONFIG: | |
2977 | ismesh = true; | |
136cfa28 | 2978 | if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) |
2a519311 | 2979 | break; |
9caf0364 | 2980 | cfg = (u8 *)ie + 2; |
2a519311 JB |
2981 | memset(&iwe, 0, sizeof(iwe)); |
2982 | iwe.cmd = IWEVCUSTOM; | |
76aa5e70 RP |
2983 | sprintf(buf, "Mesh Network Path Selection Protocol ID: " |
2984 | "0x%02X", cfg[0]); | |
2a519311 | 2985 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
2986 | current_ev = iwe_stream_add_point_check(info, |
2987 | current_ev, | |
2988 | end_buf, | |
2989 | &iwe, buf); | |
2990 | if (IS_ERR(current_ev)) | |
2991 | goto unlock; | |
76aa5e70 RP |
2992 | sprintf(buf, "Path Selection Metric ID: 0x%02X", |
2993 | cfg[1]); | |
2a519311 | 2994 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
2995 | current_ev = iwe_stream_add_point_check(info, |
2996 | current_ev, | |
2997 | end_buf, | |
2998 | &iwe, buf); | |
2999 | if (IS_ERR(current_ev)) | |
3000 | goto unlock; | |
76aa5e70 RP |
3001 | sprintf(buf, "Congestion Control Mode ID: 0x%02X", |
3002 | cfg[2]); | |
2a519311 | 3003 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
3004 | current_ev = iwe_stream_add_point_check(info, |
3005 | current_ev, | |
3006 | end_buf, | |
3007 | &iwe, buf); | |
3008 | if (IS_ERR(current_ev)) | |
3009 | goto unlock; | |
76aa5e70 | 3010 | sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]); |
2a519311 | 3011 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
3012 | current_ev = iwe_stream_add_point_check(info, |
3013 | current_ev, | |
3014 | end_buf, | |
3015 | &iwe, buf); | |
3016 | if (IS_ERR(current_ev)) | |
3017 | goto unlock; | |
76aa5e70 RP |
3018 | sprintf(buf, "Authentication ID: 0x%02X", cfg[4]); |
3019 | iwe.u.data.length = strlen(buf); | |
76a70e9c JM |
3020 | current_ev = iwe_stream_add_point_check(info, |
3021 | current_ev, | |
3022 | end_buf, | |
3023 | &iwe, buf); | |
3024 | if (IS_ERR(current_ev)) | |
3025 | goto unlock; | |
76aa5e70 RP |
3026 | sprintf(buf, "Formation Info: 0x%02X", cfg[5]); |
3027 | iwe.u.data.length = strlen(buf); | |
76a70e9c JM |
3028 | current_ev = iwe_stream_add_point_check(info, |
3029 | current_ev, | |
3030 | end_buf, | |
3031 | &iwe, buf); | |
3032 | if (IS_ERR(current_ev)) | |
3033 | goto unlock; | |
76aa5e70 | 3034 | sprintf(buf, "Capabilities: 0x%02X", cfg[6]); |
2a519311 | 3035 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
3036 | current_ev = iwe_stream_add_point_check(info, |
3037 | current_ev, | |
3038 | end_buf, | |
3039 | &iwe, buf); | |
3040 | if (IS_ERR(current_ev)) | |
3041 | goto unlock; | |
2a519311 JB |
3042 | break; |
3043 | case WLAN_EID_SUPP_RATES: | |
3044 | case WLAN_EID_EXT_SUPP_RATES: | |
3045 | /* display all supported rates in readable format */ | |
3046 | p = current_ev + iwe_stream_lcp_len(info); | |
3047 | ||
3048 | memset(&iwe, 0, sizeof(iwe)); | |
3049 | iwe.cmd = SIOCGIWRATE; | |
3050 | /* Those two flags are ignored... */ | |
3051 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; | |
3052 | ||
3053 | for (i = 0; i < ie[1]; i++) { | |
3054 | iwe.u.bitrate.value = | |
3055 | ((ie[i + 2] & 0x7f) * 500000); | |
76a70e9c | 3056 | tmp = p; |
2a519311 | 3057 | p = iwe_stream_add_value(info, current_ev, p, |
76a70e9c JM |
3058 | end_buf, &iwe, |
3059 | IW_EV_PARAM_LEN); | |
3060 | if (p == tmp) { | |
3061 | current_ev = ERR_PTR(-E2BIG); | |
3062 | goto unlock; | |
3063 | } | |
2a519311 JB |
3064 | } |
3065 | current_ev = p; | |
3066 | break; | |
3067 | } | |
3068 | rem -= ie[1] + 2; | |
3069 | ie += ie[1] + 2; | |
3070 | } | |
3071 | ||
f64f9e71 JP |
3072 | if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || |
3073 | ismesh) { | |
2a519311 JB |
3074 | memset(&iwe, 0, sizeof(iwe)); |
3075 | iwe.cmd = SIOCGIWMODE; | |
3076 | if (ismesh) | |
3077 | iwe.u.mode = IW_MODE_MESH; | |
3078 | else if (bss->pub.capability & WLAN_CAPABILITY_ESS) | |
3079 | iwe.u.mode = IW_MODE_MASTER; | |
3080 | else | |
3081 | iwe.u.mode = IW_MODE_ADHOC; | |
76a70e9c JM |
3082 | current_ev = iwe_stream_add_event_check(info, current_ev, |
3083 | end_buf, &iwe, | |
3084 | IW_EV_UINT_LEN); | |
3085 | if (IS_ERR(current_ev)) | |
3086 | goto unlock; | |
2a519311 JB |
3087 | } |
3088 | ||
76a70e9c JM |
3089 | memset(&iwe, 0, sizeof(iwe)); |
3090 | iwe.cmd = IWEVCUSTOM; | |
3091 | sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf)); | |
3092 | iwe.u.data.length = strlen(buf); | |
3093 | current_ev = iwe_stream_add_point_check(info, current_ev, end_buf, | |
3094 | &iwe, buf); | |
3095 | if (IS_ERR(current_ev)) | |
3096 | goto unlock; | |
3097 | memset(&iwe, 0, sizeof(iwe)); | |
3098 | iwe.cmd = IWEVCUSTOM; | |
3099 | sprintf(buf, " Last beacon: %ums ago", | |
3100 | elapsed_jiffies_msecs(bss->ts)); | |
3101 | iwe.u.data.length = strlen(buf); | |
3102 | current_ev = iwe_stream_add_point_check(info, current_ev, | |
3103 | end_buf, &iwe, buf); | |
3104 | if (IS_ERR(current_ev)) | |
3105 | goto unlock; | |
3106 | ||
3107 | current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf); | |
3108 | ||
3109 | unlock: | |
9caf0364 | 3110 | rcu_read_unlock(); |
2a519311 JB |
3111 | return current_ev; |
3112 | } | |
3113 | ||
3114 | ||
1b8ec87a | 3115 | static int ieee80211_scan_results(struct cfg80211_registered_device *rdev, |
2a519311 JB |
3116 | struct iw_request_info *info, |
3117 | char *buf, size_t len) | |
3118 | { | |
3119 | char *current_ev = buf; | |
3120 | char *end_buf = buf + len; | |
3121 | struct cfg80211_internal_bss *bss; | |
76a70e9c | 3122 | int err = 0; |
2a519311 | 3123 | |
1b8ec87a ZG |
3124 | spin_lock_bh(&rdev->bss_lock); |
3125 | cfg80211_bss_expire(rdev); | |
2a519311 | 3126 | |
1b8ec87a | 3127 | list_for_each_entry(bss, &rdev->bss_list, list) { |
2a519311 | 3128 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { |
76a70e9c JM |
3129 | err = -E2BIG; |
3130 | break; | |
2a519311 | 3131 | } |
1b8ec87a | 3132 | current_ev = ieee80211_bss(&rdev->wiphy, info, bss, |
77965c97 | 3133 | current_ev, end_buf); |
76a70e9c JM |
3134 | if (IS_ERR(current_ev)) { |
3135 | err = PTR_ERR(current_ev); | |
3136 | break; | |
3137 | } | |
2a519311 | 3138 | } |
1b8ec87a | 3139 | spin_unlock_bh(&rdev->bss_lock); |
76a70e9c JM |
3140 | |
3141 | if (err) | |
3142 | return err; | |
2a519311 JB |
3143 | return current_ev - buf; |
3144 | } | |
3145 | ||
3146 | ||
3147 | int cfg80211_wext_giwscan(struct net_device *dev, | |
3148 | struct iw_request_info *info, | |
3149 | struct iw_point *data, char *extra) | |
3150 | { | |
3151 | struct cfg80211_registered_device *rdev; | |
3152 | int res; | |
3153 | ||
3154 | if (!netif_running(dev)) | |
3155 | return -ENETDOWN; | |
3156 | ||
463d0183 | 3157 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
3158 | |
3159 | if (IS_ERR(rdev)) | |
3160 | return PTR_ERR(rdev); | |
3161 | ||
f9d15d16 | 3162 | if (rdev->scan_req || rdev->scan_msg) |
5fe231e8 | 3163 | return -EAGAIN; |
2a519311 JB |
3164 | |
3165 | res = ieee80211_scan_results(rdev, info, extra, data->length); | |
3166 | data->length = 0; | |
3167 | if (res >= 0) { | |
3168 | data->length = res; | |
3169 | res = 0; | |
3170 | } | |
3171 | ||
2a519311 JB |
3172 | return res; |
3173 | } | |
2afe38d1 | 3174 | EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan); |
2a519311 | 3175 | #endif |