Commit | Line | Data |
---|---|---|
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 |
1b6b4ed0 | 8 | * Copyright (C) 2018-2023 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 | |
4ef2f53e | 99 | * @psd_20: The 20MHz PSD EIRP of the primary 20MHz channel for the reported AP |
c8cb5b85 TM |
100 | */ |
101 | struct cfg80211_colocated_ap { | |
102 | struct list_head list; | |
103 | u8 bssid[ETH_ALEN]; | |
104 | u8 ssid[IEEE80211_MAX_SSID_LEN]; | |
105 | size_t ssid_len; | |
106 | u32 short_ssid; | |
107 | u32 center_freq; | |
108 | u8 unsolicited_probe:1, | |
109 | oct_recommended:1, | |
110 | same_ssid:1, | |
111 | multi_bss:1, | |
112 | transmitted_bssid:1, | |
113 | colocated_ess:1, | |
114 | short_ssid_valid:1; | |
4ef2f53e | 115 | s8 psd_20; |
c8cb5b85 TM |
116 | }; |
117 | ||
776b3580 | 118 | static void bss_free(struct cfg80211_internal_bss *bss) |
e8e27c66 | 119 | { |
9caf0364 | 120 | struct cfg80211_bss_ies *ies; |
b629ea3d JB |
121 | |
122 | if (WARN_ON(atomic_read(&bss->hold))) | |
123 | return; | |
124 | ||
9caf0364 | 125 | ies = (void *)rcu_access_pointer(bss->pub.beacon_ies); |
776b3580 | 126 | if (ies && !bss->pub.hidden_beacon_bss) |
9caf0364 JB |
127 | kfree_rcu(ies, rcu_head); |
128 | ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies); | |
129 | if (ies) | |
130 | kfree_rcu(ies, rcu_head); | |
e8e27c66 | 131 | |
776b3580 JB |
132 | /* |
133 | * This happens when the module is removed, it doesn't | |
134 | * really matter any more save for completeness | |
135 | */ | |
136 | if (!list_empty(&bss->hidden_list)) | |
137 | list_del(&bss->hidden_list); | |
138 | ||
e8e27c66 AK |
139 | kfree(bss); |
140 | } | |
141 | ||
1b8ec87a | 142 | static inline void bss_ref_get(struct cfg80211_registered_device *rdev, |
776b3580 | 143 | struct cfg80211_internal_bss *bss) |
0532d4f1 | 144 | { |
1b8ec87a | 145 | lockdep_assert_held(&rdev->bss_lock); |
776b3580 JB |
146 | |
147 | bss->refcount++; | |
0b780881 JB |
148 | |
149 | if (bss->pub.hidden_beacon_bss) | |
150 | bss_from_pub(bss->pub.hidden_beacon_bss)->refcount++; | |
151 | ||
152 | if (bss->pub.transmitted_bss) | |
153 | bss_from_pub(bss->pub.transmitted_bss)->refcount++; | |
0532d4f1 JB |
154 | } |
155 | ||
1b8ec87a | 156 | static inline void bss_ref_put(struct cfg80211_registered_device *rdev, |
776b3580 | 157 | struct cfg80211_internal_bss *bss) |
0532d4f1 | 158 | { |
1b8ec87a | 159 | lockdep_assert_held(&rdev->bss_lock); |
776b3580 JB |
160 | |
161 | if (bss->pub.hidden_beacon_bss) { | |
162 | struct cfg80211_internal_bss *hbss; | |
61e41e5d JB |
163 | |
164 | hbss = bss_from_pub(bss->pub.hidden_beacon_bss); | |
776b3580 JB |
165 | hbss->refcount--; |
166 | if (hbss->refcount == 0) | |
167 | bss_free(hbss); | |
168 | } | |
a3584f56 | 169 | |
7011ba58 | 170 | if (bss->pub.transmitted_bss) { |
a3584f56 SS |
171 | struct cfg80211_internal_bss *tbss; |
172 | ||
61e41e5d | 173 | tbss = bss_from_pub(bss->pub.transmitted_bss); |
a3584f56 SS |
174 | tbss->refcount--; |
175 | if (tbss->refcount == 0) | |
176 | bss_free(tbss); | |
177 | } | |
178 | ||
776b3580 JB |
179 | bss->refcount--; |
180 | if (bss->refcount == 0) | |
181 | bss_free(bss); | |
0532d4f1 JB |
182 | } |
183 | ||
1b8ec87a | 184 | static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev, |
e8e27c66 AK |
185 | struct cfg80211_internal_bss *bss) |
186 | { | |
1b8ec87a | 187 | lockdep_assert_held(&rdev->bss_lock); |
4b1af479 | 188 | |
776b3580 JB |
189 | if (!list_empty(&bss->hidden_list)) { |
190 | /* | |
191 | * don't remove the beacon entry if it has | |
192 | * probe responses associated with it | |
193 | */ | |
194 | if (!bss->pub.hidden_beacon_bss) | |
195 | return false; | |
196 | /* | |
197 | * if it's a probe response entry break its | |
198 | * link to the other entries in the group | |
199 | */ | |
200 | list_del_init(&bss->hidden_list); | |
201 | } | |
202 | ||
e8e27c66 | 203 | list_del_init(&bss->list); |
7011ba58 | 204 | list_del_init(&bss->pub.nontrans_list); |
1b8ec87a | 205 | rb_erase(&bss->rbn, &rdev->bss_tree); |
9853a55e JB |
206 | rdev->bss_entries--; |
207 | WARN_ONCE((rdev->bss_entries == 0) ^ list_empty(&rdev->bss_list), | |
208 | "rdev bss entries[%d]/list[empty:%d] corruption\n", | |
209 | rdev->bss_entries, list_empty(&rdev->bss_list)); | |
1b8ec87a | 210 | bss_ref_put(rdev, bss); |
776b3580 | 211 | return true; |
e8e27c66 AK |
212 | } |
213 | ||
f7dacfb1 SS |
214 | bool cfg80211_is_element_inherited(const struct element *elem, |
215 | const struct element *non_inherit_elem) | |
216 | { | |
217 | u8 id_len, ext_id_len, i, loop_len, id; | |
218 | const u8 *list; | |
219 | ||
220 | if (elem->id == WLAN_EID_MULTIPLE_BSSID) | |
221 | return false; | |
891d4d58 BB |
222 | |
223 | if (elem->id == WLAN_EID_EXTENSION && elem->datalen > 1 && | |
224 | elem->data[0] == WLAN_EID_EXT_EHT_MULTI_LINK) | |
225 | return false; | |
f7dacfb1 SS |
226 | |
227 | if (!non_inherit_elem || non_inherit_elem->datalen < 2) | |
228 | return true; | |
229 | ||
230 | /* | |
231 | * non inheritance element format is: | |
232 | * ext ID (56) | IDs list len | list | extension IDs list len | list | |
233 | * Both lists are optional. Both lengths are mandatory. | |
234 | * This means valid length is: | |
235 | * elem_len = 1 (extension ID) + 2 (list len fields) + list lengths | |
236 | */ | |
237 | id_len = non_inherit_elem->data[1]; | |
238 | if (non_inherit_elem->datalen < 3 + id_len) | |
239 | return true; | |
240 | ||
241 | ext_id_len = non_inherit_elem->data[2 + id_len]; | |
242 | if (non_inherit_elem->datalen < 3 + id_len + ext_id_len) | |
243 | return true; | |
244 | ||
245 | if (elem->id == WLAN_EID_EXTENSION) { | |
246 | if (!ext_id_len) | |
247 | return true; | |
248 | loop_len = ext_id_len; | |
249 | list = &non_inherit_elem->data[3 + id_len]; | |
250 | id = elem->data[0]; | |
251 | } else { | |
252 | if (!id_len) | |
253 | return true; | |
254 | loop_len = id_len; | |
255 | list = &non_inherit_elem->data[2]; | |
256 | id = elem->id; | |
257 | } | |
258 | ||
259 | for (i = 0; i < loop_len; i++) { | |
260 | if (list[i] == id) | |
261 | return false; | |
262 | } | |
263 | ||
264 | return true; | |
265 | } | |
266 | EXPORT_SYMBOL(cfg80211_is_element_inherited); | |
267 | ||
dfd9aa3e BB |
268 | static size_t cfg80211_copy_elem_with_frags(const struct element *elem, |
269 | const u8 *ie, size_t ie_len, | |
270 | u8 **pos, u8 *buf, size_t buf_len) | |
0b8fb823 | 271 | { |
dfd9aa3e BB |
272 | if (WARN_ON((u8 *)elem < ie || elem->data > ie + ie_len || |
273 | elem->data + elem->datalen > ie + ie_len)) | |
274 | return 0; | |
0b8fb823 | 275 | |
dfd9aa3e | 276 | if (elem->datalen + 2 > buf + buf_len - *pos) |
0b8fb823 | 277 | return 0; |
0b8fb823 | 278 | |
dfd9aa3e BB |
279 | memcpy(*pos, elem, elem->datalen + 2); |
280 | *pos += elem->datalen + 2; | |
0b8fb823 | 281 | |
dfd9aa3e BB |
282 | /* Finish if it is not fragmented */ |
283 | if (elem->datalen != 255) | |
284 | return *pos - buf; | |
285 | ||
286 | ie_len = ie + ie_len - elem->data - elem->datalen; | |
287 | ie = (const u8 *)elem->data + elem->datalen; | |
288 | ||
289 | for_each_element(elem, ie, ie_len) { | |
290 | if (elem->id != WLAN_EID_FRAGMENT) | |
291 | break; | |
292 | ||
293 | if (elem->datalen + 2 > buf + buf_len - *pos) | |
294 | return 0; | |
295 | ||
296 | memcpy(*pos, elem, elem->datalen + 2); | |
297 | *pos += elem->datalen + 2; | |
298 | ||
299 | if (elem->datalen != 255) | |
300 | break; | |
0b8fb823 PX |
301 | } |
302 | ||
dfd9aa3e BB |
303 | return *pos - buf; |
304 | } | |
f7dacfb1 | 305 | |
dfd9aa3e BB |
306 | static size_t cfg80211_gen_new_ie(const u8 *ie, size_t ielen, |
307 | const u8 *subie, size_t subie_len, | |
308 | u8 *new_ie, size_t new_ie_len) | |
309 | { | |
310 | const struct element *non_inherit_elem, *parent, *sub; | |
311 | u8 *pos = new_ie; | |
312 | u8 id, ext_id; | |
313 | unsigned int match_len; | |
314 | ||
315 | non_inherit_elem = cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE, | |
316 | subie, subie_len); | |
317 | ||
318 | /* We copy the elements one by one from the parent to the generated | |
319 | * elements. | |
320 | * If they are not inherited (included in subie or in the non | |
321 | * inheritance element), then we copy all occurrences the first time | |
322 | * we see this element type. | |
0b8fb823 | 323 | */ |
dfd9aa3e BB |
324 | for_each_element(parent, ie, ielen) { |
325 | if (parent->id == WLAN_EID_FRAGMENT) | |
0b8fb823 | 326 | continue; |
dfd9aa3e BB |
327 | |
328 | if (parent->id == WLAN_EID_EXTENSION) { | |
329 | if (parent->datalen < 1) | |
330 | continue; | |
331 | ||
332 | id = WLAN_EID_EXTENSION; | |
333 | ext_id = parent->data[0]; | |
334 | match_len = 1; | |
335 | } else { | |
336 | id = parent->id; | |
337 | match_len = 0; | |
0b8fb823 PX |
338 | } |
339 | ||
dfd9aa3e BB |
340 | /* Find first occurrence in subie */ |
341 | sub = cfg80211_find_elem_match(id, subie, subie_len, | |
342 | &ext_id, match_len, 0); | |
c17fe043 | 343 | |
dfd9aa3e BB |
344 | /* Copy from parent if not in subie and inherited */ |
345 | if (!sub && | |
346 | cfg80211_is_element_inherited(parent, non_inherit_elem)) { | |
347 | if (!cfg80211_copy_elem_with_frags(parent, | |
348 | ie, ielen, | |
349 | &pos, new_ie, | |
350 | new_ie_len)) | |
351 | return 0; | |
f7dacfb1 | 352 | |
dfd9aa3e | 353 | continue; |
0b8fb823 PX |
354 | } |
355 | ||
dfd9aa3e BB |
356 | /* Already copied if an earlier element had the same type */ |
357 | if (cfg80211_find_elem_match(id, ie, (u8 *)parent - ie, | |
358 | &ext_id, match_len, 0)) | |
359 | continue; | |
0b8fb823 | 360 | |
dfd9aa3e BB |
361 | /* Not inheriting, copy all similar elements from subie */ |
362 | while (sub) { | |
363 | if (!cfg80211_copy_elem_with_frags(sub, | |
364 | subie, subie_len, | |
365 | &pos, new_ie, | |
366 | new_ie_len)) | |
367 | return 0; | |
368 | ||
369 | sub = cfg80211_find_elem_match(id, | |
370 | sub->data + sub->datalen, | |
371 | subie_len + subie - | |
372 | (sub->data + | |
373 | sub->datalen), | |
374 | &ext_id, match_len, 0); | |
375 | } | |
0b8fb823 PX |
376 | } |
377 | ||
dfd9aa3e BB |
378 | /* The above misses elements that are included in subie but not in the |
379 | * parent, so do a pass over subie and append those. | |
380 | * Skip the non-tx BSSID caps and non-inheritance element. | |
0b8fb823 | 381 | */ |
dfd9aa3e BB |
382 | for_each_element(sub, subie, subie_len) { |
383 | if (sub->id == WLAN_EID_NON_TX_BSSID_CAP) | |
384 | continue; | |
385 | ||
386 | if (sub->id == WLAN_EID_FRAGMENT) | |
387 | continue; | |
388 | ||
389 | if (sub->id == WLAN_EID_EXTENSION) { | |
390 | if (sub->datalen < 1) | |
391 | continue; | |
392 | ||
393 | id = WLAN_EID_EXTENSION; | |
394 | ext_id = sub->data[0]; | |
395 | match_len = 1; | |
396 | ||
397 | if (ext_id == WLAN_EID_EXT_NON_INHERITANCE) | |
398 | continue; | |
399 | } else { | |
400 | id = sub->id; | |
401 | match_len = 0; | |
0b8fb823 | 402 | } |
dfd9aa3e BB |
403 | |
404 | /* Processed if one was included in the parent */ | |
405 | if (cfg80211_find_elem_match(id, ie, ielen, | |
406 | &ext_id, match_len, 0)) | |
407 | continue; | |
408 | ||
409 | if (!cfg80211_copy_elem_with_frags(sub, subie, subie_len, | |
410 | &pos, new_ie, new_ie_len)) | |
411 | return 0; | |
0b8fb823 PX |
412 | } |
413 | ||
0b8fb823 PX |
414 | return pos - new_ie; |
415 | } | |
416 | ||
417 | static bool is_bss(struct cfg80211_bss *a, const u8 *bssid, | |
418 | const u8 *ssid, size_t ssid_len) | |
419 | { | |
420 | const struct cfg80211_bss_ies *ies; | |
a3eca817 | 421 | const struct element *ssid_elem; |
0b8fb823 PX |
422 | |
423 | if (bssid && !ether_addr_equal(a->bssid, bssid)) | |
424 | return false; | |
425 | ||
426 | if (!ssid) | |
427 | return true; | |
428 | ||
429 | ies = rcu_access_pointer(a->ies); | |
430 | if (!ies) | |
431 | return false; | |
a3eca817 JB |
432 | ssid_elem = cfg80211_find_elem(WLAN_EID_SSID, ies->data, ies->len); |
433 | if (!ssid_elem) | |
0b8fb823 | 434 | return false; |
a3eca817 | 435 | if (ssid_elem->datalen != ssid_len) |
0b8fb823 | 436 | return false; |
a3eca817 | 437 | return memcmp(ssid_elem->data, ssid, ssid_len) == 0; |
0b8fb823 PX |
438 | } |
439 | ||
440 | static int | |
7011ba58 SS |
441 | cfg80211_add_nontrans_list(struct cfg80211_bss *trans_bss, |
442 | struct cfg80211_bss *nontrans_bss) | |
0b8fb823 | 443 | { |
fb8b53ac | 444 | const struct element *ssid_elem; |
7011ba58 | 445 | struct cfg80211_bss *bss = NULL; |
0b8fb823 PX |
446 | |
447 | rcu_read_lock(); | |
fb8b53ac JB |
448 | ssid_elem = ieee80211_bss_get_elem(nontrans_bss, WLAN_EID_SSID); |
449 | if (!ssid_elem) { | |
0b8fb823 PX |
450 | rcu_read_unlock(); |
451 | return -EINVAL; | |
452 | } | |
0b8fb823 PX |
453 | |
454 | /* check if nontrans_bss is in the list */ | |
455 | list_for_each_entry(bss, &trans_bss->nontrans_list, nontrans_list) { | |
fb8b53ac JB |
456 | if (is_bss(bss, nontrans_bss->bssid, ssid_elem->data, |
457 | ssid_elem->datalen)) { | |
a2083eeb | 458 | rcu_read_unlock(); |
0b8fb823 | 459 | return 0; |
a2083eeb | 460 | } |
0b8fb823 PX |
461 | } |
462 | ||
a2083eeb JB |
463 | rcu_read_unlock(); |
464 | ||
bcca8520 JB |
465 | /* |
466 | * This is a bit weird - it's not on the list, but already on another | |
467 | * one! The only way that could happen is if there's some BSSID/SSID | |
468 | * shared by multiple APs in their multi-BSSID profiles, potentially | |
469 | * with hidden SSID mixed in ... ignore it. | |
470 | */ | |
471 | if (!list_empty(&nontrans_bss->nontrans_list)) | |
472 | return -EINVAL; | |
473 | ||
0b8fb823 PX |
474 | /* add to the list */ |
475 | list_add_tail(&nontrans_bss->nontrans_list, &trans_bss->nontrans_list); | |
476 | return 0; | |
477 | } | |
478 | ||
1b8ec87a | 479 | static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev, |
15d6030b SL |
480 | unsigned long expire_time) |
481 | { | |
482 | struct cfg80211_internal_bss *bss, *tmp; | |
483 | bool expired = false; | |
484 | ||
1b8ec87a | 485 | lockdep_assert_held(&rdev->bss_lock); |
4b1af479 | 486 | |
1b8ec87a | 487 | list_for_each_entry_safe(bss, tmp, &rdev->bss_list, list) { |
15d6030b SL |
488 | if (atomic_read(&bss->hold)) |
489 | continue; | |
490 | if (!time_after(expire_time, bss->ts)) | |
491 | continue; | |
492 | ||
1b8ec87a | 493 | if (__cfg80211_unlink_bss(rdev, bss)) |
776b3580 | 494 | expired = true; |
15d6030b SL |
495 | } |
496 | ||
497 | if (expired) | |
1b8ec87a | 498 | rdev->bss_generation++; |
15d6030b SL |
499 | } |
500 | ||
9853a55e JB |
501 | static bool cfg80211_bss_expire_oldest(struct cfg80211_registered_device *rdev) |
502 | { | |
503 | struct cfg80211_internal_bss *bss, *oldest = NULL; | |
504 | bool ret; | |
505 | ||
506 | lockdep_assert_held(&rdev->bss_lock); | |
507 | ||
508 | list_for_each_entry(bss, &rdev->bss_list, list) { | |
509 | if (atomic_read(&bss->hold)) | |
510 | continue; | |
511 | ||
512 | if (!list_empty(&bss->hidden_list) && | |
513 | !bss->pub.hidden_beacon_bss) | |
514 | continue; | |
515 | ||
516 | if (oldest && time_before(oldest->ts, bss->ts)) | |
517 | continue; | |
518 | oldest = bss; | |
519 | } | |
520 | ||
521 | if (WARN_ON(!oldest)) | |
522 | return false; | |
523 | ||
524 | /* | |
525 | * The callers make sure to increase rdev->bss_generation if anything | |
526 | * gets removed (and a new entry added), so there's no need to also do | |
527 | * it here. | |
528 | */ | |
529 | ||
530 | ret = __cfg80211_unlink_bss(rdev, oldest); | |
531 | WARN_ON(!ret); | |
532 | return ret; | |
533 | } | |
534 | ||
c8cb5b85 TM |
535 | static u8 cfg80211_parse_bss_param(u8 data, |
536 | struct cfg80211_colocated_ap *coloc_ap) | |
537 | { | |
538 | coloc_ap->oct_recommended = | |
539 | u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_OCT_RECOMMENDED); | |
540 | coloc_ap->same_ssid = | |
541 | u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_SAME_SSID); | |
542 | coloc_ap->multi_bss = | |
543 | u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_MULTI_BSSID); | |
544 | coloc_ap->transmitted_bssid = | |
545 | u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_TRANSMITTED_BSSID); | |
546 | coloc_ap->unsolicited_probe = | |
547 | u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_PROBE_ACTIVE); | |
548 | coloc_ap->colocated_ess = | |
549 | u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_COLOC_ESS); | |
550 | ||
551 | return u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_COLOC_AP); | |
552 | } | |
553 | ||
554 | static int cfg80211_calc_short_ssid(const struct cfg80211_bss_ies *ies, | |
555 | const struct element **elem, u32 *s_ssid) | |
556 | { | |
557 | ||
558 | *elem = cfg80211_find_elem(WLAN_EID_SSID, ies->data, ies->len); | |
559 | if (!*elem || (*elem)->datalen > IEEE80211_MAX_SSID_LEN) | |
560 | return -EINVAL; | |
561 | ||
562 | *s_ssid = ~crc32_le(~0, (*elem)->data, (*elem)->datalen); | |
563 | return 0; | |
564 | } | |
565 | ||
566 | static void cfg80211_free_coloc_ap_list(struct list_head *coloc_ap_list) | |
567 | { | |
568 | struct cfg80211_colocated_ap *ap, *tmp_ap; | |
569 | ||
570 | list_for_each_entry_safe(ap, tmp_ap, coloc_ap_list, list) { | |
571 | list_del(&ap->list); | |
572 | kfree(ap); | |
573 | } | |
574 | } | |
575 | ||
576 | static int cfg80211_parse_ap_info(struct cfg80211_colocated_ap *entry, | |
577 | const u8 *pos, u8 length, | |
578 | const struct element *ssid_elem, | |
dc92e54c | 579 | u32 s_ssid_tmp) |
c8cb5b85 | 580 | { |
dc92e54c | 581 | u8 bss_params; |
c8cb5b85 | 582 | |
4ef2f53e IP |
583 | entry->psd_20 = IEEE80211_RNR_TBTT_PARAMS_PSD_RESERVED; |
584 | ||
dc92e54c BB |
585 | /* The length is already verified by the caller to contain bss_params */ |
586 | if (length > sizeof(struct ieee80211_tbtt_info_7_8_9)) { | |
587 | struct ieee80211_tbtt_info_ge_11 *tbtt_info = (void *)pos; | |
c8cb5b85 | 588 | |
dc92e54c BB |
589 | memcpy(entry->bssid, tbtt_info->bssid, ETH_ALEN); |
590 | entry->short_ssid = le32_to_cpu(tbtt_info->short_ssid); | |
c8cb5b85 | 591 | entry->short_ssid_valid = true; |
dc92e54c BB |
592 | |
593 | bss_params = tbtt_info->bss_params; | |
a0ed5011 BB |
594 | |
595 | /* Ignore disabled links */ | |
596 | if (length >= offsetofend(typeof(*tbtt_info), mld_params)) { | |
597 | if (le16_get_bits(tbtt_info->mld_params.params, | |
598 | IEEE80211_RNR_MLD_PARAMS_DISABLED_LINK)) | |
599 | return -EINVAL; | |
600 | } | |
4ef2f53e IP |
601 | |
602 | if (length >= offsetofend(struct ieee80211_tbtt_info_ge_11, | |
603 | psd_20)) | |
604 | entry->psd_20 = tbtt_info->psd_20; | |
dc92e54c BB |
605 | } else { |
606 | struct ieee80211_tbtt_info_7_8_9 *tbtt_info = (void *)pos; | |
607 | ||
608 | memcpy(entry->bssid, tbtt_info->bssid, ETH_ALEN); | |
609 | ||
610 | bss_params = tbtt_info->bss_params; | |
4ef2f53e IP |
611 | |
612 | if (length == offsetofend(struct ieee80211_tbtt_info_7_8_9, | |
613 | psd_20)) | |
614 | entry->psd_20 = tbtt_info->psd_20; | |
c8cb5b85 TM |
615 | } |
616 | ||
dc92e54c BB |
617 | /* ignore entries with invalid BSSID */ |
618 | if (!is_valid_ether_addr(entry->bssid)) | |
619 | return -EINVAL; | |
620 | ||
c8cb5b85 | 621 | /* skip non colocated APs */ |
dc92e54c | 622 | if (!cfg80211_parse_bss_param(bss_params, entry)) |
c8cb5b85 | 623 | return -EINVAL; |
c8cb5b85 | 624 | |
dc92e54c BB |
625 | /* no information about the short ssid. Consider the entry valid |
626 | * for now. It would later be dropped in case there are explicit | |
627 | * SSIDs that need to be matched | |
628 | */ | |
629 | if (!entry->same_ssid && !entry->short_ssid_valid) | |
630 | return 0; | |
c8cb5b85 TM |
631 | |
632 | if (entry->same_ssid) { | |
633 | entry->short_ssid = s_ssid_tmp; | |
634 | entry->short_ssid_valid = true; | |
635 | ||
636 | /* | |
637 | * This is safe because we validate datalen in | |
638 | * cfg80211_parse_colocated_ap(), before calling this | |
639 | * function. | |
640 | */ | |
dc92e54c | 641 | memcpy(&entry->ssid, &ssid_elem->data, ssid_elem->datalen); |
c8cb5b85 TM |
642 | entry->ssid_len = ssid_elem->datalen; |
643 | } | |
dc92e54c | 644 | |
c8cb5b85 TM |
645 | return 0; |
646 | } | |
647 | ||
648 | static int cfg80211_parse_colocated_ap(const struct cfg80211_bss_ies *ies, | |
649 | struct list_head *list) | |
650 | { | |
651 | struct ieee80211_neighbor_ap_info *ap_info; | |
652 | const struct element *elem, *ssid_elem; | |
653 | const u8 *pos, *end; | |
654 | u32 s_ssid_tmp; | |
655 | int n_coloc = 0, ret; | |
656 | LIST_HEAD(ap_list); | |
657 | ||
c8cb5b85 TM |
658 | ret = cfg80211_calc_short_ssid(ies, &ssid_elem, &s_ssid_tmp); |
659 | if (ret) | |
fd7f08d9 | 660 | return 0; |
c8cb5b85 | 661 | |
5461707a BB |
662 | for_each_element_id(elem, WLAN_EID_REDUCED_NEIGHBOR_REPORT, |
663 | ies->data, ies->len) { | |
664 | pos = elem->data; | |
665 | end = elem->data + elem->datalen; | |
c8cb5b85 | 666 | |
5461707a BB |
667 | /* RNR IE may contain more than one NEIGHBOR_AP_INFO */ |
668 | while (pos + sizeof(*ap_info) <= end) { | |
669 | enum nl80211_band band; | |
670 | int freq; | |
671 | u8 length, i, count; | |
c8cb5b85 | 672 | |
5461707a BB |
673 | ap_info = (void *)pos; |
674 | count = u8_get_bits(ap_info->tbtt_info_hdr, | |
675 | IEEE80211_AP_INFO_TBTT_HDR_COUNT) + 1; | |
676 | length = ap_info->tbtt_info_len; | |
c8cb5b85 | 677 | |
5461707a | 678 | pos += sizeof(*ap_info); |
c8cb5b85 | 679 | |
5461707a BB |
680 | if (!ieee80211_operating_class_to_band(ap_info->op_class, |
681 | &band)) | |
682 | break; | |
c8cb5b85 | 683 | |
5461707a BB |
684 | freq = ieee80211_channel_to_frequency(ap_info->channel, |
685 | band); | |
c8cb5b85 | 686 | |
5461707a BB |
687 | if (end - pos < count * length) |
688 | break; | |
03e7e493 | 689 | |
5461707a BB |
690 | if (u8_get_bits(ap_info->tbtt_info_hdr, |
691 | IEEE80211_AP_INFO_TBTT_HDR_TYPE) != | |
692 | IEEE80211_TBTT_INFO_TYPE_TBTT) { | |
693 | pos += count * length; | |
694 | continue; | |
695 | } | |
696 | ||
697 | /* TBTT info must include bss param + BSSID + | |
698 | * (short SSID or same_ssid bit to be set). | |
699 | * ignore other options, and move to the | |
700 | * next AP info | |
701 | */ | |
702 | if (band != NL80211_BAND_6GHZ || | |
703 | !(length == offsetofend(struct ieee80211_tbtt_info_7_8_9, | |
704 | bss_params) || | |
705 | length == sizeof(struct ieee80211_tbtt_info_7_8_9) || | |
706 | length >= offsetofend(struct ieee80211_tbtt_info_ge_11, | |
707 | bss_params))) { | |
708 | pos += count * length; | |
709 | continue; | |
710 | } | |
c8cb5b85 | 711 | |
5461707a BB |
712 | for (i = 0; i < count; i++) { |
713 | struct cfg80211_colocated_ap *entry; | |
c8cb5b85 | 714 | |
5461707a BB |
715 | entry = kzalloc(sizeof(*entry) + IEEE80211_MAX_SSID_LEN, |
716 | GFP_ATOMIC); | |
c8cb5b85 | 717 | |
5461707a BB |
718 | if (!entry) |
719 | goto error; | |
c8cb5b85 | 720 | |
5461707a | 721 | entry->center_freq = freq; |
c8cb5b85 | 722 | |
5461707a BB |
723 | if (!cfg80211_parse_ap_info(entry, pos, length, |
724 | ssid_elem, | |
725 | s_ssid_tmp)) { | |
726 | n_coloc++; | |
727 | list_add_tail(&entry->list, &ap_list); | |
728 | } else { | |
729 | kfree(entry); | |
730 | } | |
c8cb5b85 | 731 | |
5461707a BB |
732 | pos += length; |
733 | } | |
c8cb5b85 | 734 | } |
c8cb5b85 | 735 | |
8dcc91c4 | 736 | error: |
5461707a BB |
737 | if (pos != end) { |
738 | cfg80211_free_coloc_ap_list(&ap_list); | |
739 | return 0; | |
740 | } | |
c8cb5b85 TM |
741 | } |
742 | ||
743 | list_splice_tail(&ap_list, list); | |
744 | return n_coloc; | |
745 | } | |
746 | ||
747 | static void cfg80211_scan_req_add_chan(struct cfg80211_scan_request *request, | |
748 | struct ieee80211_channel *chan, | |
749 | bool add_to_6ghz) | |
750 | { | |
751 | int i; | |
752 | u32 n_channels = request->n_channels; | |
753 | struct cfg80211_scan_6ghz_params *params = | |
754 | &request->scan_6ghz_params[request->n_6ghz_params]; | |
755 | ||
756 | for (i = 0; i < n_channels; i++) { | |
757 | if (request->channels[i] == chan) { | |
758 | if (add_to_6ghz) | |
759 | params->channel_idx = i; | |
760 | return; | |
761 | } | |
762 | } | |
763 | ||
764 | request->channels[n_channels] = chan; | |
765 | if (add_to_6ghz) | |
766 | request->scan_6ghz_params[request->n_6ghz_params].channel_idx = | |
767 | n_channels; | |
768 | ||
769 | request->n_channels++; | |
770 | } | |
771 | ||
772 | static bool cfg80211_find_ssid_match(struct cfg80211_colocated_ap *ap, | |
773 | struct cfg80211_scan_request *request) | |
774 | { | |
ba5c2523 | 775 | int i; |
c8cb5b85 TM |
776 | u32 s_ssid; |
777 | ||
778 | for (i = 0; i < request->n_ssids; i++) { | |
779 | /* wildcard ssid in the scan request */ | |
5666ee15 AS |
780 | if (!request->ssids[i].ssid_len) { |
781 | if (ap->multi_bss && !ap->transmitted_bssid) | |
782 | continue; | |
783 | ||
c8cb5b85 | 784 | return true; |
5666ee15 | 785 | } |
c8cb5b85 TM |
786 | |
787 | if (ap->ssid_len && | |
788 | ap->ssid_len == request->ssids[i].ssid_len) { | |
789 | if (!memcmp(request->ssids[i].ssid, ap->ssid, | |
790 | ap->ssid_len)) | |
791 | return true; | |
792 | } else if (ap->short_ssid_valid) { | |
793 | s_ssid = ~crc32_le(~0, request->ssids[i].ssid, | |
794 | request->ssids[i].ssid_len); | |
795 | ||
796 | if (ap->short_ssid == s_ssid) | |
797 | return true; | |
798 | } | |
799 | } | |
800 | ||
801 | return false; | |
802 | } | |
803 | ||
804 | static int cfg80211_scan_6ghz(struct cfg80211_registered_device *rdev) | |
805 | { | |
806 | u8 i; | |
807 | struct cfg80211_colocated_ap *ap; | |
808 | int n_channels, count = 0, err; | |
809 | struct cfg80211_scan_request *request, *rdev_req = rdev->scan_req; | |
810 | LIST_HEAD(coloc_ap_list); | |
d590a125 | 811 | bool need_scan_psc = true; |
c8cb5b85 TM |
812 | const struct ieee80211_sband_iftype_data *iftd; |
813 | ||
814 | rdev_req->scan_6ghz = true; | |
815 | ||
816 | if (!rdev->wiphy.bands[NL80211_BAND_6GHZ]) | |
817 | return -EOPNOTSUPP; | |
818 | ||
819 | iftd = ieee80211_get_sband_iftype_data(rdev->wiphy.bands[NL80211_BAND_6GHZ], | |
820 | rdev_req->wdev->iftype); | |
821 | if (!iftd || !iftd->he_cap.has_he) | |
822 | return -EOPNOTSUPP; | |
823 | ||
824 | n_channels = rdev->wiphy.bands[NL80211_BAND_6GHZ]->n_channels; | |
825 | ||
826 | if (rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ) { | |
827 | struct cfg80211_internal_bss *intbss; | |
828 | ||
829 | spin_lock_bh(&rdev->bss_lock); | |
830 | list_for_each_entry(intbss, &rdev->bss_list, list) { | |
831 | struct cfg80211_bss *res = &intbss->pub; | |
832 | const struct cfg80211_bss_ies *ies; | |
0fca7784 IP |
833 | const struct element *ssid_elem; |
834 | struct cfg80211_colocated_ap *entry; | |
835 | u32 s_ssid_tmp; | |
836 | int ret; | |
c8cb5b85 TM |
837 | |
838 | ies = rcu_access_pointer(res->ies); | |
839 | count += cfg80211_parse_colocated_ap(ies, | |
840 | &coloc_ap_list); | |
0fca7784 IP |
841 | |
842 | /* In case the scan request specified a specific BSSID | |
843 | * and the BSS is found and operating on 6GHz band then | |
844 | * add this AP to the collocated APs list. | |
845 | * This is relevant for ML probe requests when the lower | |
846 | * band APs have not been discovered. | |
847 | */ | |
848 | if (is_broadcast_ether_addr(rdev_req->bssid) || | |
849 | !ether_addr_equal(rdev_req->bssid, res->bssid) || | |
850 | res->channel->band != NL80211_BAND_6GHZ) | |
851 | continue; | |
852 | ||
853 | ret = cfg80211_calc_short_ssid(ies, &ssid_elem, | |
854 | &s_ssid_tmp); | |
855 | if (ret) | |
856 | continue; | |
857 | ||
858 | entry = kzalloc(sizeof(*entry) + IEEE80211_MAX_SSID_LEN, | |
859 | GFP_ATOMIC); | |
860 | ||
861 | if (!entry) | |
862 | continue; | |
863 | ||
864 | memcpy(entry->bssid, res->bssid, ETH_ALEN); | |
865 | entry->short_ssid = s_ssid_tmp; | |
866 | memcpy(entry->ssid, ssid_elem->data, | |
867 | ssid_elem->datalen); | |
868 | entry->ssid_len = ssid_elem->datalen; | |
869 | entry->short_ssid_valid = true; | |
870 | entry->center_freq = res->channel->center_freq; | |
871 | ||
872 | list_add_tail(&entry->list, &coloc_ap_list); | |
873 | count++; | |
c8cb5b85 TM |
874 | } |
875 | spin_unlock_bh(&rdev->bss_lock); | |
876 | } | |
877 | ||
878 | request = kzalloc(struct_size(request, channels, n_channels) + | |
52bb2052 IP |
879 | sizeof(*request->scan_6ghz_params) * count + |
880 | sizeof(*request->ssids) * rdev_req->n_ssids, | |
c8cb5b85 TM |
881 | GFP_KERNEL); |
882 | if (!request) { | |
883 | cfg80211_free_coloc_ap_list(&coloc_ap_list); | |
884 | return -ENOMEM; | |
885 | } | |
886 | ||
887 | *request = *rdev_req; | |
888 | request->n_channels = 0; | |
889 | request->scan_6ghz_params = | |
890 | (void *)&request->channels[n_channels]; | |
891 | ||
892 | /* | |
d590a125 AB |
893 | * PSC channels should not be scanned in case of direct scan with 1 SSID |
894 | * and at least one of the reported co-located APs with same SSID | |
895 | * indicating that all APs in the same ESS are co-located | |
c8cb5b85 | 896 | */ |
d590a125 | 897 | if (count && request->n_ssids == 1 && request->ssids[0].ssid_len) { |
c8cb5b85 | 898 | list_for_each_entry(ap, &coloc_ap_list, list) { |
d590a125 AB |
899 | if (ap->colocated_ess && |
900 | cfg80211_find_ssid_match(ap, request)) { | |
901 | need_scan_psc = false; | |
c8cb5b85 TM |
902 | break; |
903 | } | |
904 | } | |
c8cb5b85 TM |
905 | } |
906 | ||
907 | /* | |
908 | * add to the scan request the channels that need to be scanned | |
909 | * regardless of the collocated APs (PSC channels or all channels | |
910 | * in case that NL80211_SCAN_FLAG_COLOCATED_6GHZ is not set) | |
911 | */ | |
912 | for (i = 0; i < rdev_req->n_channels; i++) { | |
913 | if (rdev_req->channels[i]->band == NL80211_BAND_6GHZ && | |
914 | ((need_scan_psc && | |
915 | cfg80211_channel_is_psc(rdev_req->channels[i])) || | |
916 | !(rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ))) { | |
917 | cfg80211_scan_req_add_chan(request, | |
918 | rdev_req->channels[i], | |
919 | false); | |
920 | } | |
921 | } | |
922 | ||
923 | if (!(rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ)) | |
924 | goto skip; | |
925 | ||
926 | list_for_each_entry(ap, &coloc_ap_list, list) { | |
927 | bool found = false; | |
928 | struct cfg80211_scan_6ghz_params *scan_6ghz_params = | |
929 | &request->scan_6ghz_params[request->n_6ghz_params]; | |
930 | struct ieee80211_channel *chan = | |
931 | ieee80211_get_channel(&rdev->wiphy, ap->center_freq); | |
932 | ||
933 | if (!chan || chan->flags & IEEE80211_CHAN_DISABLED) | |
934 | continue; | |
935 | ||
936 | for (i = 0; i < rdev_req->n_channels; i++) { | |
937 | if (rdev_req->channels[i] == chan) | |
938 | found = true; | |
939 | } | |
940 | ||
941 | if (!found) | |
942 | continue; | |
943 | ||
944 | if (request->n_ssids > 0 && | |
945 | !cfg80211_find_ssid_match(ap, request)) | |
946 | continue; | |
947 | ||
0914468a IP |
948 | if (!is_broadcast_ether_addr(request->bssid) && |
949 | !ether_addr_equal(request->bssid, ap->bssid)) | |
950 | continue; | |
951 | ||
5666ee15 AS |
952 | if (!request->n_ssids && ap->multi_bss && !ap->transmitted_bssid) |
953 | continue; | |
954 | ||
c8cb5b85 TM |
955 | cfg80211_scan_req_add_chan(request, chan, true); |
956 | memcpy(scan_6ghz_params->bssid, ap->bssid, ETH_ALEN); | |
957 | scan_6ghz_params->short_ssid = ap->short_ssid; | |
958 | scan_6ghz_params->short_ssid_valid = ap->short_ssid_valid; | |
959 | scan_6ghz_params->unsolicited_probe = ap->unsolicited_probe; | |
4ef2f53e | 960 | scan_6ghz_params->psd_20 = ap->psd_20; |
c8cb5b85 TM |
961 | |
962 | /* | |
963 | * If a PSC channel is added to the scan and 'need_scan_psc' is | |
964 | * set to false, then all the APs that the scan logic is | |
965 | * interested with on the channel are collocated and thus there | |
966 | * is no need to perform the initial PSC channel listen. | |
967 | */ | |
968 | if (cfg80211_channel_is_psc(chan) && !need_scan_psc) | |
969 | scan_6ghz_params->psc_no_listen = true; | |
970 | ||
971 | request->n_6ghz_params++; | |
972 | } | |
973 | ||
974 | skip: | |
975 | cfg80211_free_coloc_ap_list(&coloc_ap_list); | |
976 | ||
977 | if (request->n_channels) { | |
978 | struct cfg80211_scan_request *old = rdev->int_scan_req; | |
c8cb5b85 TM |
979 | rdev->int_scan_req = request; |
980 | ||
52bb2052 IP |
981 | /* |
982 | * Add the ssids from the parent scan request to the new scan | |
983 | * request, so the driver would be able to use them in its | |
984 | * probe requests to discover hidden APs on PSC channels. | |
985 | */ | |
986 | request->ssids = (void *)&request->channels[request->n_channels]; | |
987 | request->n_ssids = rdev_req->n_ssids; | |
988 | memcpy(request->ssids, rdev_req->ssids, sizeof(*request->ssids) * | |
989 | request->n_ssids); | |
990 | ||
c8cb5b85 TM |
991 | /* |
992 | * If this scan follows a previous scan, save the scan start | |
993 | * info from the first part of the scan | |
994 | */ | |
995 | if (old) | |
996 | rdev->int_scan_req->info = old->info; | |
997 | ||
998 | err = rdev_scan(rdev, request); | |
999 | if (err) { | |
1000 | rdev->int_scan_req = old; | |
1001 | kfree(request); | |
1002 | } else { | |
1003 | kfree(old); | |
1004 | } | |
1005 | ||
1006 | return err; | |
1007 | } | |
1008 | ||
1009 | kfree(request); | |
1010 | return -EINVAL; | |
1011 | } | |
1012 | ||
1013 | int cfg80211_scan(struct cfg80211_registered_device *rdev) | |
1014 | { | |
1015 | struct cfg80211_scan_request *request; | |
1016 | struct cfg80211_scan_request *rdev_req = rdev->scan_req; | |
1017 | u32 n_channels = 0, idx, i; | |
1018 | ||
1019 | if (!(rdev->wiphy.flags & WIPHY_FLAG_SPLIT_SCAN_6GHZ)) | |
1020 | return rdev_scan(rdev, rdev_req); | |
1021 | ||
1022 | for (i = 0; i < rdev_req->n_channels; i++) { | |
1023 | if (rdev_req->channels[i]->band != NL80211_BAND_6GHZ) | |
1024 | n_channels++; | |
1025 | } | |
1026 | ||
1027 | if (!n_channels) | |
1028 | return cfg80211_scan_6ghz(rdev); | |
1029 | ||
1030 | request = kzalloc(struct_size(request, channels, n_channels), | |
1031 | GFP_KERNEL); | |
1032 | if (!request) | |
1033 | return -ENOMEM; | |
1034 | ||
1035 | *request = *rdev_req; | |
1036 | request->n_channels = n_channels; | |
1037 | ||
1038 | for (i = idx = 0; i < rdev_req->n_channels; i++) { | |
1039 | if (rdev_req->channels[i]->band != NL80211_BAND_6GHZ) | |
1040 | request->channels[idx++] = rdev_req->channels[i]; | |
1041 | } | |
1042 | ||
1043 | rdev_req->scan_6ghz = false; | |
1044 | rdev->int_scan_req = request; | |
1045 | return rdev_scan(rdev, request); | |
1046 | } | |
1047 | ||
f9d15d16 JB |
1048 | void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, |
1049 | bool send_message) | |
2a519311 | 1050 | { |
c8cb5b85 | 1051 | struct cfg80211_scan_request *request, *rdev_req; |
fd014284 | 1052 | struct wireless_dev *wdev; |
f9d15d16 | 1053 | struct sk_buff *msg; |
3d23e349 | 1054 | #ifdef CONFIG_CFG80211_WEXT |
2a519311 JB |
1055 | union iwreq_data wrqu; |
1056 | #endif | |
1057 | ||
a05829a7 | 1058 | lockdep_assert_held(&rdev->wiphy.mtx); |
01a0ac41 | 1059 | |
f9d15d16 | 1060 | if (rdev->scan_msg) { |
505a2e88 | 1061 | nl80211_send_scan_msg(rdev, rdev->scan_msg); |
f9d15d16 JB |
1062 | rdev->scan_msg = NULL; |
1063 | return; | |
1064 | } | |
667503dd | 1065 | |
c8cb5b85 TM |
1066 | rdev_req = rdev->scan_req; |
1067 | if (!rdev_req) | |
01a0ac41 JB |
1068 | return; |
1069 | ||
c8cb5b85 TM |
1070 | wdev = rdev_req->wdev; |
1071 | request = rdev->int_scan_req ? rdev->int_scan_req : rdev_req; | |
1072 | ||
1073 | if (wdev_running(wdev) && | |
1074 | (rdev->wiphy.flags & WIPHY_FLAG_SPLIT_SCAN_6GHZ) && | |
1075 | !rdev_req->scan_6ghz && !request->info.aborted && | |
1076 | !cfg80211_scan_6ghz(rdev)) | |
1077 | return; | |
2a519311 | 1078 | |
6829c878 JB |
1079 | /* |
1080 | * This must be before sending the other events! | |
1081 | * Otherwise, wpa_supplicant gets completely confused with | |
1082 | * wext events. | |
1083 | */ | |
fd014284 JB |
1084 | if (wdev->netdev) |
1085 | cfg80211_sme_scan_done(wdev->netdev); | |
6829c878 | 1086 | |
1d76250b | 1087 | if (!request->info.aborted && |
f9d15d16 JB |
1088 | request->flags & NL80211_SCAN_FLAG_FLUSH) { |
1089 | /* flush entries from previous scans */ | |
1090 | spin_lock_bh(&rdev->bss_lock); | |
1091 | __cfg80211_bss_expire(rdev, request->scan_start); | |
1092 | spin_unlock_bh(&rdev->bss_lock); | |
15d6030b | 1093 | } |
2a519311 | 1094 | |
1d76250b | 1095 | msg = nl80211_build_scan_msg(rdev, wdev, request->info.aborted); |
f9d15d16 | 1096 | |
3d23e349 | 1097 | #ifdef CONFIG_CFG80211_WEXT |
1d76250b | 1098 | if (wdev->netdev && !request->info.aborted) { |
2a519311 JB |
1099 | memset(&wrqu, 0, sizeof(wrqu)); |
1100 | ||
fd014284 | 1101 | wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL); |
2a519311 JB |
1102 | } |
1103 | #endif | |
1104 | ||
1160dfa1 | 1105 | dev_put(wdev->netdev); |
2a519311 | 1106 | |
c8cb5b85 TM |
1107 | kfree(rdev->int_scan_req); |
1108 | rdev->int_scan_req = NULL; | |
1109 | ||
1110 | kfree(rdev->scan_req); | |
36e6fea8 | 1111 | rdev->scan_req = NULL; |
f9d15d16 JB |
1112 | |
1113 | if (!send_message) | |
1114 | rdev->scan_msg = msg; | |
1115 | else | |
505a2e88 | 1116 | nl80211_send_scan_msg(rdev, msg); |
2a519311 | 1117 | } |
667503dd | 1118 | |
fe0af9fe | 1119 | void __cfg80211_scan_done(struct wiphy *wiphy, struct wiphy_work *wk) |
36e6fea8 | 1120 | { |
fe0af9fe | 1121 | ___cfg80211_scan_done(wiphy_to_rdev(wiphy), true); |
36e6fea8 JB |
1122 | } |
1123 | ||
1d76250b AS |
1124 | void cfg80211_scan_done(struct cfg80211_scan_request *request, |
1125 | struct cfg80211_scan_info *info) | |
667503dd | 1126 | { |
c8cb5b85 TM |
1127 | struct cfg80211_scan_info old_info = request->info; |
1128 | ||
1d76250b | 1129 | trace_cfg80211_scan_done(request, info); |
c8cb5b85 TM |
1130 | WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req && |
1131 | request != wiphy_to_rdev(request->wiphy)->int_scan_req); | |
667503dd | 1132 | |
1d76250b | 1133 | request->info = *info; |
c8cb5b85 TM |
1134 | |
1135 | /* | |
1136 | * In case the scan is split, the scan_start_tsf and tsf_bssid should | |
1137 | * be of the first part. In such a case old_info.scan_start_tsf should | |
1138 | * be non zero. | |
1139 | */ | |
1140 | if (request->scan_6ghz && old_info.scan_start_tsf) { | |
1141 | request->info.scan_start_tsf = old_info.scan_start_tsf; | |
1142 | memcpy(request->info.tsf_bssid, old_info.tsf_bssid, | |
1143 | sizeof(request->info.tsf_bssid)); | |
1144 | } | |
1145 | ||
5fe231e8 | 1146 | request->notified = true; |
fe0af9fe JB |
1147 | wiphy_work_queue(request->wiphy, |
1148 | &wiphy_to_rdev(request->wiphy)->scan_done_wk); | |
667503dd | 1149 | } |
2a519311 JB |
1150 | EXPORT_SYMBOL(cfg80211_scan_done); |
1151 | ||
ca986ad9 AVS |
1152 | void cfg80211_add_sched_scan_req(struct cfg80211_registered_device *rdev, |
1153 | struct cfg80211_sched_scan_request *req) | |
1154 | { | |
a05829a7 | 1155 | lockdep_assert_held(&rdev->wiphy.mtx); |
ca986ad9 AVS |
1156 | |
1157 | list_add_rcu(&req->list, &rdev->sched_scan_req_list); | |
1158 | } | |
1159 | ||
1160 | static void cfg80211_del_sched_scan_req(struct cfg80211_registered_device *rdev, | |
1161 | struct cfg80211_sched_scan_request *req) | |
1162 | { | |
a05829a7 | 1163 | lockdep_assert_held(&rdev->wiphy.mtx); |
ca986ad9 AVS |
1164 | |
1165 | list_del_rcu(&req->list); | |
1166 | kfree_rcu(req, rcu_head); | |
1167 | } | |
1168 | ||
1169 | static struct cfg80211_sched_scan_request * | |
1170 | cfg80211_find_sched_scan_req(struct cfg80211_registered_device *rdev, u64 reqid) | |
1171 | { | |
1172 | struct cfg80211_sched_scan_request *pos; | |
1173 | ||
3ee9306b | 1174 | list_for_each_entry_rcu(pos, &rdev->sched_scan_req_list, list, |
a05829a7 | 1175 | lockdep_is_held(&rdev->wiphy.mtx)) { |
ca986ad9 AVS |
1176 | if (pos->reqid == reqid) |
1177 | return pos; | |
1178 | } | |
b34939b9 | 1179 | return NULL; |
ca986ad9 AVS |
1180 | } |
1181 | ||
1182 | /* | |
1183 | * Determines if a scheduled scan request can be handled. When a legacy | |
1184 | * scheduled scan is running no other scheduled scan is allowed regardless | |
1185 | * whether the request is for legacy or multi-support scan. When a multi-support | |
1186 | * scheduled scan is running a request for legacy scan is not allowed. In this | |
1187 | * case a request for multi-support scan can be handled if resources are | |
1188 | * available, ie. struct wiphy::max_sched_scan_reqs limit is not yet reached. | |
1189 | */ | |
1190 | int cfg80211_sched_scan_req_possible(struct cfg80211_registered_device *rdev, | |
1191 | bool want_multi) | |
1192 | { | |
1193 | struct cfg80211_sched_scan_request *pos; | |
1194 | int i = 0; | |
1195 | ||
1196 | list_for_each_entry(pos, &rdev->sched_scan_req_list, list) { | |
1197 | /* request id zero means legacy in progress */ | |
1198 | if (!i && !pos->reqid) | |
1199 | return -EINPROGRESS; | |
1200 | i++; | |
1201 | } | |
1202 | ||
1203 | if (i) { | |
1204 | /* no legacy allowed when multi request(s) are active */ | |
1205 | if (!want_multi) | |
1206 | return -EINPROGRESS; | |
1207 | ||
1208 | /* resource limit reached */ | |
1209 | if (i == rdev->wiphy.max_sched_scan_reqs) | |
1210 | return -ENOSPC; | |
1211 | } | |
1212 | return 0; | |
1213 | } | |
1214 | ||
b34939b9 | 1215 | void cfg80211_sched_scan_results_wk(struct work_struct *work) |
807f8a8c LC |
1216 | { |
1217 | struct cfg80211_registered_device *rdev; | |
b34939b9 | 1218 | struct cfg80211_sched_scan_request *req, *tmp; |
807f8a8c | 1219 | |
b34939b9 AVS |
1220 | rdev = container_of(work, struct cfg80211_registered_device, |
1221 | sched_scan_res_wk); | |
807f8a8c | 1222 | |
a05829a7 | 1223 | wiphy_lock(&rdev->wiphy); |
b34939b9 AVS |
1224 | list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) { |
1225 | if (req->report_results) { | |
1226 | req->report_results = false; | |
1227 | if (req->flags & NL80211_SCAN_FLAG_FLUSH) { | |
1228 | /* flush entries from previous scans */ | |
1229 | spin_lock_bh(&rdev->bss_lock); | |
1230 | __cfg80211_bss_expire(rdev, req->scan_start); | |
1231 | spin_unlock_bh(&rdev->bss_lock); | |
1232 | req->scan_start = jiffies; | |
1233 | } | |
1234 | nl80211_send_sched_scan(req, | |
1235 | NL80211_CMD_SCHED_SCAN_RESULTS); | |
15d6030b | 1236 | } |
15d6030b | 1237 | } |
a05829a7 | 1238 | wiphy_unlock(&rdev->wiphy); |
807f8a8c LC |
1239 | } |
1240 | ||
b34939b9 | 1241 | void cfg80211_sched_scan_results(struct wiphy *wiphy, u64 reqid) |
807f8a8c | 1242 | { |
ca986ad9 AVS |
1243 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
1244 | struct cfg80211_sched_scan_request *request; | |
1245 | ||
b34939b9 | 1246 | trace_cfg80211_sched_scan_results(wiphy, reqid); |
807f8a8c | 1247 | /* ignore if we're not scanning */ |
31a60ed1 | 1248 | |
1b57b621 | 1249 | rcu_read_lock(); |
b34939b9 AVS |
1250 | request = cfg80211_find_sched_scan_req(rdev, reqid); |
1251 | if (request) { | |
1252 | request->report_results = true; | |
1253 | queue_work(cfg80211_wq, &rdev->sched_scan_res_wk); | |
1254 | } | |
1b57b621 | 1255 | rcu_read_unlock(); |
807f8a8c LC |
1256 | } |
1257 | EXPORT_SYMBOL(cfg80211_sched_scan_results); | |
1258 | ||
a05829a7 | 1259 | void cfg80211_sched_scan_stopped_locked(struct wiphy *wiphy, u64 reqid) |
807f8a8c | 1260 | { |
f26cbf40 | 1261 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
807f8a8c | 1262 | |
a05829a7 | 1263 | lockdep_assert_held(&wiphy->mtx); |
792e6aa7 | 1264 | |
b34939b9 | 1265 | trace_cfg80211_sched_scan_stopped(wiphy, reqid); |
4ee3e063 | 1266 | |
b34939b9 | 1267 | __cfg80211_stop_sched_scan(rdev, reqid, true); |
792e6aa7 | 1268 | } |
a05829a7 | 1269 | EXPORT_SYMBOL(cfg80211_sched_scan_stopped_locked); |
792e6aa7 | 1270 | |
b34939b9 | 1271 | void cfg80211_sched_scan_stopped(struct wiphy *wiphy, u64 reqid) |
792e6aa7 | 1272 | { |
a05829a7 JB |
1273 | wiphy_lock(wiphy); |
1274 | cfg80211_sched_scan_stopped_locked(wiphy, reqid); | |
1275 | wiphy_unlock(wiphy); | |
807f8a8c | 1276 | } |
807f8a8c LC |
1277 | EXPORT_SYMBOL(cfg80211_sched_scan_stopped); |
1278 | ||
ca986ad9 AVS |
1279 | int cfg80211_stop_sched_scan_req(struct cfg80211_registered_device *rdev, |
1280 | struct cfg80211_sched_scan_request *req, | |
1281 | bool driver_initiated) | |
807f8a8c | 1282 | { |
a05829a7 | 1283 | lockdep_assert_held(&rdev->wiphy.mtx); |
807f8a8c | 1284 | |
85a9994a | 1285 | if (!driver_initiated) { |
3a3ecf1d | 1286 | int err = rdev_sched_scan_stop(rdev, req->dev, req->reqid); |
85a9994a LC |
1287 | if (err) |
1288 | return err; | |
1289 | } | |
807f8a8c | 1290 | |
ca986ad9 | 1291 | nl80211_send_sched_scan(req, NL80211_CMD_SCHED_SCAN_STOPPED); |
807f8a8c | 1292 | |
ca986ad9 | 1293 | cfg80211_del_sched_scan_req(rdev, req); |
807f8a8c | 1294 | |
3b4670ff | 1295 | return 0; |
807f8a8c LC |
1296 | } |
1297 | ||
ca986ad9 AVS |
1298 | int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev, |
1299 | u64 reqid, bool driver_initiated) | |
1300 | { | |
1301 | struct cfg80211_sched_scan_request *sched_scan_req; | |
1302 | ||
a05829a7 | 1303 | lockdep_assert_held(&rdev->wiphy.mtx); |
ca986ad9 AVS |
1304 | |
1305 | sched_scan_req = cfg80211_find_sched_scan_req(rdev, reqid); | |
b34939b9 AVS |
1306 | if (!sched_scan_req) |
1307 | return -ENOENT; | |
ca986ad9 AVS |
1308 | |
1309 | return cfg80211_stop_sched_scan_req(rdev, sched_scan_req, | |
1310 | driver_initiated); | |
1311 | } | |
1312 | ||
1b8ec87a | 1313 | void cfg80211_bss_age(struct cfg80211_registered_device *rdev, |
cb3a8eec DW |
1314 | unsigned long age_secs) |
1315 | { | |
1316 | struct cfg80211_internal_bss *bss; | |
1317 | unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); | |
1318 | ||
1b8ec87a ZG |
1319 | spin_lock_bh(&rdev->bss_lock); |
1320 | list_for_each_entry(bss, &rdev->bss_list, list) | |
cb3a8eec | 1321 | bss->ts -= age_jiffies; |
1b8ec87a | 1322 | spin_unlock_bh(&rdev->bss_lock); |
cb3a8eec DW |
1323 | } |
1324 | ||
1b8ec87a | 1325 | void cfg80211_bss_expire(struct cfg80211_registered_device *rdev) |
2a519311 | 1326 | { |
1b8ec87a | 1327 | __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE); |
2a519311 JB |
1328 | } |
1329 | ||
2f1805ea EG |
1330 | void cfg80211_bss_flush(struct wiphy *wiphy) |
1331 | { | |
1332 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); | |
1333 | ||
1334 | spin_lock_bh(&rdev->bss_lock); | |
1335 | __cfg80211_bss_expire(rdev, jiffies); | |
1336 | spin_unlock_bh(&rdev->bss_lock); | |
1337 | } | |
1338 | EXPORT_SYMBOL(cfg80211_bss_flush); | |
1339 | ||
49a68e0d JB |
1340 | const struct element * |
1341 | cfg80211_find_elem_match(u8 eid, const u8 *ies, unsigned int len, | |
1342 | const u8 *match, unsigned int match_len, | |
1343 | unsigned int match_offset) | |
2a519311 | 1344 | { |
0f3b07f0 JB |
1345 | const struct element *elem; |
1346 | ||
0f3b07f0 | 1347 | for_each_element_id(elem, eid, ies, len) { |
49a68e0d JB |
1348 | if (elem->datalen >= match_offset + match_len && |
1349 | !memcmp(elem->data + match_offset, match, match_len)) | |
1350 | return elem; | |
2a519311 | 1351 | } |
fbd05e4a LC |
1352 | |
1353 | return NULL; | |
2a519311 | 1354 | } |
49a68e0d | 1355 | EXPORT_SYMBOL(cfg80211_find_elem_match); |
2a519311 | 1356 | |
49a68e0d JB |
1357 | const struct element *cfg80211_find_vendor_elem(unsigned int oui, int oui_type, |
1358 | const u8 *ies, | |
1359 | unsigned int len) | |
0c28ec58 | 1360 | { |
49a68e0d | 1361 | const struct element *elem; |
fbd05e4a LC |
1362 | u8 match[] = { oui >> 16, oui >> 8, oui, oui_type }; |
1363 | int match_len = (oui_type < 0) ? 3 : sizeof(match); | |
0c28ec58 | 1364 | |
9e9ea439 EG |
1365 | if (WARN_ON(oui_type > 0xff)) |
1366 | return NULL; | |
1367 | ||
49a68e0d JB |
1368 | elem = cfg80211_find_elem_match(WLAN_EID_VENDOR_SPECIFIC, ies, len, |
1369 | match, match_len, 0); | |
6719429d | 1370 | |
49a68e0d | 1371 | if (!elem || elem->datalen < 4) |
fbd05e4a | 1372 | return NULL; |
6719429d | 1373 | |
49a68e0d | 1374 | return elem; |
0c28ec58 | 1375 | } |
49a68e0d | 1376 | EXPORT_SYMBOL(cfg80211_find_vendor_elem); |
0c28ec58 | 1377 | |
4593c4cb JB |
1378 | /** |
1379 | * enum bss_compare_mode - BSS compare mode | |
1380 | * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find) | |
1381 | * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode | |
1382 | * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode | |
1383 | */ | |
1384 | enum bss_compare_mode { | |
1385 | BSS_CMP_REGULAR, | |
1386 | BSS_CMP_HIDE_ZLEN, | |
1387 | BSS_CMP_HIDE_NUL, | |
1388 | }; | |
1389 | ||
dd9dfb9f | 1390 | static int cmp_bss(struct cfg80211_bss *a, |
5622f5bb | 1391 | struct cfg80211_bss *b, |
4593c4cb | 1392 | enum bss_compare_mode mode) |
dd9dfb9f | 1393 | { |
9caf0364 | 1394 | const struct cfg80211_bss_ies *a_ies, *b_ies; |
3af6341c JB |
1395 | const u8 *ie1 = NULL; |
1396 | const u8 *ie2 = NULL; | |
5622f5bb | 1397 | int i, r; |
dd9dfb9f | 1398 | |
3af6341c | 1399 | if (a->channel != b->channel) |
c1d3214d JKS |
1400 | return (b->channel->center_freq * 1000 + b->channel->freq_offset) - |
1401 | (a->channel->center_freq * 1000 + a->channel->freq_offset); | |
dd9dfb9f | 1402 | |
9caf0364 JB |
1403 | a_ies = rcu_access_pointer(a->ies); |
1404 | if (!a_ies) | |
1405 | return -1; | |
1406 | b_ies = rcu_access_pointer(b->ies); | |
1407 | if (!b_ies) | |
1408 | return 1; | |
1409 | ||
3af6341c JB |
1410 | if (WLAN_CAPABILITY_IS_STA_BSS(a->capability)) |
1411 | ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID, | |
1412 | a_ies->data, a_ies->len); | |
1413 | if (WLAN_CAPABILITY_IS_STA_BSS(b->capability)) | |
1414 | ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID, | |
1415 | b_ies->data, b_ies->len); | |
1416 | if (ie1 && ie2) { | |
1417 | int mesh_id_cmp; | |
1418 | ||
1419 | if (ie1[1] == ie2[1]) | |
1420 | mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]); | |
1421 | else | |
1422 | mesh_id_cmp = ie2[1] - ie1[1]; | |
1423 | ||
1424 | ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, | |
1425 | a_ies->data, a_ies->len); | |
1426 | ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, | |
1427 | b_ies->data, b_ies->len); | |
1428 | if (ie1 && ie2) { | |
1429 | if (mesh_id_cmp) | |
1430 | return mesh_id_cmp; | |
1431 | if (ie1[1] != ie2[1]) | |
1432 | return ie2[1] - ie1[1]; | |
1433 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); | |
1434 | } | |
1435 | } | |
1436 | ||
3af6341c JB |
1437 | r = memcmp(a->bssid, b->bssid, sizeof(a->bssid)); |
1438 | if (r) | |
1439 | return r; | |
1440 | ||
9caf0364 JB |
1441 | ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len); |
1442 | ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len); | |
dd9dfb9f | 1443 | |
5622f5bb JB |
1444 | if (!ie1 && !ie2) |
1445 | return 0; | |
1446 | ||
f94f8b16 | 1447 | /* |
5622f5bb JB |
1448 | * Note that with "hide_ssid", the function returns a match if |
1449 | * the already-present BSS ("b") is a hidden SSID beacon for | |
1450 | * the new BSS ("a"). | |
f94f8b16 | 1451 | */ |
dd9dfb9f DT |
1452 | |
1453 | /* sort missing IE before (left of) present IE */ | |
1454 | if (!ie1) | |
1455 | return -1; | |
1456 | if (!ie2) | |
1457 | return 1; | |
1458 | ||
4593c4cb JB |
1459 | switch (mode) { |
1460 | case BSS_CMP_HIDE_ZLEN: | |
1461 | /* | |
1462 | * In ZLEN mode we assume the BSS entry we're | |
1463 | * looking for has a zero-length SSID. So if | |
1464 | * the one we're looking at right now has that, | |
1465 | * return 0. Otherwise, return the difference | |
1466 | * in length, but since we're looking for the | |
1467 | * 0-length it's really equivalent to returning | |
1468 | * the length of the one we're looking at. | |
1469 | * | |
1470 | * No content comparison is needed as we assume | |
1471 | * the content length is zero. | |
1472 | */ | |
1473 | return ie2[1]; | |
1474 | case BSS_CMP_REGULAR: | |
1475 | default: | |
1476 | /* sort by length first, then by contents */ | |
1477 | if (ie1[1] != ie2[1]) | |
1478 | return ie2[1] - ie1[1]; | |
5622f5bb | 1479 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); |
4593c4cb JB |
1480 | case BSS_CMP_HIDE_NUL: |
1481 | if (ie1[1] != ie2[1]) | |
1482 | return ie2[1] - ie1[1]; | |
1483 | /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */ | |
1484 | for (i = 0; i < ie2[1]; i++) | |
1485 | if (ie2[i + 2]) | |
1486 | return -1; | |
1487 | return 0; | |
1488 | } | |
dd9dfb9f DT |
1489 | } |
1490 | ||
6eb18137 | 1491 | static bool cfg80211_bss_type_match(u16 capability, |
57fbcce3 | 1492 | enum nl80211_band band, |
6eb18137 DL |
1493 | enum ieee80211_bss_type bss_type) |
1494 | { | |
1495 | bool ret = true; | |
1496 | u16 mask, val; | |
1497 | ||
1498 | if (bss_type == IEEE80211_BSS_TYPE_ANY) | |
1499 | return ret; | |
1500 | ||
57fbcce3 | 1501 | if (band == NL80211_BAND_60GHZ) { |
6eb18137 DL |
1502 | mask = WLAN_CAPABILITY_DMG_TYPE_MASK; |
1503 | switch (bss_type) { | |
1504 | case IEEE80211_BSS_TYPE_ESS: | |
1505 | val = WLAN_CAPABILITY_DMG_TYPE_AP; | |
1506 | break; | |
1507 | case IEEE80211_BSS_TYPE_PBSS: | |
1508 | val = WLAN_CAPABILITY_DMG_TYPE_PBSS; | |
1509 | break; | |
1510 | case IEEE80211_BSS_TYPE_IBSS: | |
1511 | val = WLAN_CAPABILITY_DMG_TYPE_IBSS; | |
1512 | break; | |
1513 | default: | |
1514 | return false; | |
1515 | } | |
1516 | } else { | |
1517 | mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS; | |
1518 | switch (bss_type) { | |
1519 | case IEEE80211_BSS_TYPE_ESS: | |
1520 | val = WLAN_CAPABILITY_ESS; | |
1521 | break; | |
1522 | case IEEE80211_BSS_TYPE_IBSS: | |
1523 | val = WLAN_CAPABILITY_IBSS; | |
1524 | break; | |
1525 | case IEEE80211_BSS_TYPE_MBSS: | |
1526 | val = 0; | |
1527 | break; | |
1528 | default: | |
1529 | return false; | |
1530 | } | |
1531 | } | |
1532 | ||
1533 | ret = ((capability & mask) == val); | |
1534 | return ret; | |
1535 | } | |
1536 | ||
0e3a39b5 | 1537 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
d02a12b8 JB |
1538 | struct cfg80211_bss *__cfg80211_get_bss(struct wiphy *wiphy, |
1539 | struct ieee80211_channel *channel, | |
1540 | const u8 *bssid, | |
1541 | const u8 *ssid, size_t ssid_len, | |
1542 | enum ieee80211_bss_type bss_type, | |
1543 | enum ieee80211_privacy privacy, | |
1544 | u32 use_for) | |
2a519311 | 1545 | { |
f26cbf40 | 1546 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
2a519311 | 1547 | struct cfg80211_internal_bss *bss, *res = NULL; |
ccb6c136 | 1548 | unsigned long now = jiffies; |
6eb18137 | 1549 | int bss_privacy; |
2a519311 | 1550 | |
6eb18137 DL |
1551 | trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type, |
1552 | privacy); | |
4ee3e063 | 1553 | |
1b8ec87a | 1554 | spin_lock_bh(&rdev->bss_lock); |
2a519311 | 1555 | |
1b8ec87a | 1556 | list_for_each_entry(bss, &rdev->bss_list, list) { |
6eb18137 DL |
1557 | if (!cfg80211_bss_type_match(bss->pub.capability, |
1558 | bss->pub.channel->band, bss_type)) | |
1559 | continue; | |
1560 | ||
1561 | bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY); | |
1562 | if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) || | |
1563 | (privacy == IEEE80211_PRIVACY_OFF && bss_privacy)) | |
79420f09 | 1564 | continue; |
2a519311 JB |
1565 | if (channel && bss->pub.channel != channel) |
1566 | continue; | |
c14a7400 JB |
1567 | if (!is_valid_ether_addr(bss->pub.bssid)) |
1568 | continue; | |
d02a12b8 JB |
1569 | if ((bss->pub.use_for & use_for) != use_for) |
1570 | continue; | |
ccb6c136 JB |
1571 | /* Don't get expired BSS structs */ |
1572 | if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) && | |
1573 | !atomic_read(&bss->hold)) | |
1574 | continue; | |
2a519311 JB |
1575 | if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { |
1576 | res = bss; | |
1b8ec87a | 1577 | bss_ref_get(rdev, res); |
2a519311 JB |
1578 | break; |
1579 | } | |
1580 | } | |
1581 | ||
1b8ec87a | 1582 | spin_unlock_bh(&rdev->bss_lock); |
2a519311 JB |
1583 | if (!res) |
1584 | return NULL; | |
4ee3e063 | 1585 | trace_cfg80211_return_bss(&res->pub); |
2a519311 JB |
1586 | return &res->pub; |
1587 | } | |
d02a12b8 | 1588 | EXPORT_SYMBOL(__cfg80211_get_bss); |
2a519311 | 1589 | |
1b8ec87a | 1590 | static void rb_insert_bss(struct cfg80211_registered_device *rdev, |
2a519311 JB |
1591 | struct cfg80211_internal_bss *bss) |
1592 | { | |
1b8ec87a | 1593 | struct rb_node **p = &rdev->bss_tree.rb_node; |
2a519311 JB |
1594 | struct rb_node *parent = NULL; |
1595 | struct cfg80211_internal_bss *tbss; | |
1596 | int cmp; | |
1597 | ||
1598 | while (*p) { | |
1599 | parent = *p; | |
1600 | tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); | |
1601 | ||
4593c4cb | 1602 | cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR); |
2a519311 JB |
1603 | |
1604 | if (WARN_ON(!cmp)) { | |
1605 | /* will sort of leak this BSS */ | |
1606 | return; | |
1607 | } | |
1608 | ||
1609 | if (cmp < 0) | |
1610 | p = &(*p)->rb_left; | |
1611 | else | |
1612 | p = &(*p)->rb_right; | |
1613 | } | |
1614 | ||
1615 | rb_link_node(&bss->rbn, parent, p); | |
1b8ec87a | 1616 | rb_insert_color(&bss->rbn, &rdev->bss_tree); |
2a519311 JB |
1617 | } |
1618 | ||
1619 | static struct cfg80211_internal_bss * | |
1b8ec87a | 1620 | rb_find_bss(struct cfg80211_registered_device *rdev, |
5622f5bb | 1621 | struct cfg80211_internal_bss *res, |
4593c4cb | 1622 | enum bss_compare_mode mode) |
dd9dfb9f | 1623 | { |
1b8ec87a | 1624 | struct rb_node *n = rdev->bss_tree.rb_node; |
dd9dfb9f DT |
1625 | struct cfg80211_internal_bss *bss; |
1626 | int r; | |
1627 | ||
1628 | while (n) { | |
1629 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); | |
4593c4cb | 1630 | r = cmp_bss(&res->pub, &bss->pub, mode); |
dd9dfb9f DT |
1631 | |
1632 | if (r == 0) | |
1633 | return bss; | |
1634 | else if (r < 0) | |
1635 | n = n->rb_left; | |
1636 | else | |
1637 | n = n->rb_right; | |
1638 | } | |
1639 | ||
1640 | return NULL; | |
1641 | } | |
1642 | ||
1b8ec87a | 1643 | static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev, |
776b3580 | 1644 | struct cfg80211_internal_bss *new) |
dd9dfb9f | 1645 | { |
9caf0364 | 1646 | const struct cfg80211_bss_ies *ies; |
776b3580 JB |
1647 | struct cfg80211_internal_bss *bss; |
1648 | const u8 *ie; | |
1649 | int i, ssidlen; | |
1650 | u8 fold = 0; | |
9853a55e | 1651 | u32 n_entries = 0; |
9caf0364 | 1652 | |
776b3580 | 1653 | ies = rcu_access_pointer(new->pub.beacon_ies); |
9caf0364 | 1654 | if (WARN_ON(!ies)) |
776b3580 | 1655 | return false; |
dd9dfb9f | 1656 | |
776b3580 JB |
1657 | ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); |
1658 | if (!ie) { | |
1659 | /* nothing to do */ | |
1660 | return true; | |
1661 | } | |
1662 | ||
1663 | ssidlen = ie[1]; | |
1664 | for (i = 0; i < ssidlen; i++) | |
1665 | fold |= ie[2 + i]; | |
1666 | ||
1667 | if (fold) { | |
1668 | /* not a hidden SSID */ | |
1669 | return true; | |
1670 | } | |
1671 | ||
1672 | /* This is the bad part ... */ | |
1673 | ||
1b8ec87a | 1674 | list_for_each_entry(bss, &rdev->bss_list, list) { |
9853a55e JB |
1675 | /* |
1676 | * we're iterating all the entries anyway, so take the | |
1677 | * opportunity to validate the list length accounting | |
1678 | */ | |
1679 | n_entries++; | |
1680 | ||
776b3580 JB |
1681 | if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid)) |
1682 | continue; | |
1683 | if (bss->pub.channel != new->pub.channel) | |
1684 | continue; | |
1685 | if (rcu_access_pointer(bss->pub.beacon_ies)) | |
1686 | continue; | |
1687 | ies = rcu_access_pointer(bss->pub.ies); | |
1688 | if (!ies) | |
1689 | continue; | |
1690 | ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); | |
1691 | if (!ie) | |
1692 | continue; | |
1693 | if (ssidlen && ie[1] != ssidlen) | |
1694 | continue; | |
776b3580 JB |
1695 | if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss)) |
1696 | continue; | |
1697 | if (WARN_ON_ONCE(!list_empty(&bss->hidden_list))) | |
1698 | list_del(&bss->hidden_list); | |
1699 | /* combine them */ | |
1700 | list_add(&bss->hidden_list, &new->hidden_list); | |
1701 | bss->pub.hidden_beacon_bss = &new->pub; | |
1702 | new->refcount += bss->refcount; | |
1703 | rcu_assign_pointer(bss->pub.beacon_ies, | |
1704 | new->pub.beacon_ies); | |
1705 | } | |
1706 | ||
9853a55e JB |
1707 | WARN_ONCE(n_entries != rdev->bss_entries, |
1708 | "rdev bss entries[%d]/list[len:%d] corruption\n", | |
1709 | rdev->bss_entries, n_entries); | |
1710 | ||
776b3580 | 1711 | return true; |
dd9dfb9f DT |
1712 | } |
1713 | ||
c90b93b5 JB |
1714 | static void cfg80211_update_hidden_bsses(struct cfg80211_internal_bss *known, |
1715 | const struct cfg80211_bss_ies *new_ies, | |
1716 | const struct cfg80211_bss_ies *old_ies) | |
1717 | { | |
1718 | struct cfg80211_internal_bss *bss; | |
1719 | ||
1720 | /* Assign beacon IEs to all sub entries */ | |
1721 | list_for_each_entry(bss, &known->hidden_list, hidden_list) { | |
1722 | const struct cfg80211_bss_ies *ies; | |
1723 | ||
1724 | ies = rcu_access_pointer(bss->pub.beacon_ies); | |
1725 | WARN_ON(ies != old_ies); | |
1726 | ||
1727 | rcu_assign_pointer(bss->pub.beacon_ies, new_ies); | |
1728 | } | |
1729 | } | |
1730 | ||
3ab8227d SM |
1731 | static bool |
1732 | cfg80211_update_known_bss(struct cfg80211_registered_device *rdev, | |
1733 | struct cfg80211_internal_bss *known, | |
1734 | struct cfg80211_internal_bss *new, | |
1735 | bool signal_valid) | |
1736 | { | |
1737 | lockdep_assert_held(&rdev->bss_lock); | |
1738 | ||
1739 | /* Update IEs */ | |
1740 | if (rcu_access_pointer(new->pub.proberesp_ies)) { | |
1741 | const struct cfg80211_bss_ies *old; | |
1742 | ||
1743 | old = rcu_access_pointer(known->pub.proberesp_ies); | |
1744 | ||
1745 | rcu_assign_pointer(known->pub.proberesp_ies, | |
1746 | new->pub.proberesp_ies); | |
1747 | /* Override possible earlier Beacon frame IEs */ | |
1748 | rcu_assign_pointer(known->pub.ies, | |
1749 | new->pub.proberesp_ies); | |
1750 | if (old) | |
1751 | kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head); | |
f510bcc2 BB |
1752 | } |
1753 | ||
1754 | if (rcu_access_pointer(new->pub.beacon_ies)) { | |
3ab8227d | 1755 | const struct cfg80211_bss_ies *old; |
3ab8227d SM |
1756 | |
1757 | if (known->pub.hidden_beacon_bss && | |
1758 | !list_empty(&known->hidden_list)) { | |
1759 | const struct cfg80211_bss_ies *f; | |
1760 | ||
1761 | /* The known BSS struct is one of the probe | |
1762 | * response members of a group, but we're | |
1763 | * receiving a beacon (beacon_ies in the new | |
1764 | * bss is used). This can only mean that the | |
1765 | * AP changed its beacon from not having an | |
1766 | * SSID to showing it, which is confusing so | |
1767 | * drop this information. | |
1768 | */ | |
1769 | ||
1770 | f = rcu_access_pointer(new->pub.beacon_ies); | |
1771 | kfree_rcu((struct cfg80211_bss_ies *)f, rcu_head); | |
1772 | return false; | |
1773 | } | |
1774 | ||
1775 | old = rcu_access_pointer(known->pub.beacon_ies); | |
1776 | ||
1777 | rcu_assign_pointer(known->pub.beacon_ies, new->pub.beacon_ies); | |
1778 | ||
1779 | /* Override IEs if they were from a beacon before */ | |
1780 | if (old == rcu_access_pointer(known->pub.ies)) | |
1781 | rcu_assign_pointer(known->pub.ies, new->pub.beacon_ies); | |
1782 | ||
03c0ad4b JB |
1783 | cfg80211_update_hidden_bsses(known, |
1784 | rcu_access_pointer(new->pub.beacon_ies), | |
1785 | old); | |
3ab8227d SM |
1786 | |
1787 | if (old) | |
1788 | kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head); | |
1789 | } | |
1790 | ||
1791 | known->pub.beacon_interval = new->pub.beacon_interval; | |
1792 | ||
1793 | /* don't update the signal if beacon was heard on | |
1794 | * adjacent channel. | |
1795 | */ | |
1796 | if (signal_valid) | |
1797 | known->pub.signal = new->pub.signal; | |
1798 | known->pub.capability = new->pub.capability; | |
1799 | known->ts = new->ts; | |
1800 | known->ts_boottime = new->ts_boottime; | |
1801 | known->parent_tsf = new->parent_tsf; | |
1802 | known->pub.chains = new->pub.chains; | |
1803 | memcpy(known->pub.chain_signal, new->pub.chain_signal, | |
1804 | IEEE80211_MAX_CHAINS); | |
1805 | ether_addr_copy(known->parent_bssid, new->parent_bssid); | |
1806 | known->pub.max_bssid_indicator = new->pub.max_bssid_indicator; | |
1807 | known->pub.bssid_index = new->pub.bssid_index; | |
d02a12b8 JB |
1808 | known->pub.use_for &= new->pub.use_for; |
1809 | known->pub.cannot_use_reasons = new->pub.cannot_use_reasons; | |
3ab8227d SM |
1810 | |
1811 | return true; | |
1812 | } | |
1813 | ||
0e3a39b5 | 1814 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
6b7c93c1 BB |
1815 | static struct cfg80211_internal_bss * |
1816 | __cfg80211_bss_update(struct cfg80211_registered_device *rdev, | |
1817 | struct cfg80211_internal_bss *tmp, | |
1818 | bool signal_valid, unsigned long ts) | |
2a519311 JB |
1819 | { |
1820 | struct cfg80211_internal_bss *found = NULL; | |
2a519311 | 1821 | |
9caf0364 | 1822 | if (WARN_ON(!tmp->pub.channel)) |
2a519311 | 1823 | return NULL; |
2a519311 | 1824 | |
a3ce17d1 | 1825 | tmp->ts = ts; |
2a519311 | 1826 | |
9caf0364 | 1827 | if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) { |
9caf0364 JB |
1828 | return NULL; |
1829 | } | |
1830 | ||
1b8ec87a | 1831 | found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR); |
2a519311 | 1832 | |
cd1658f5 | 1833 | if (found) { |
3ab8227d | 1834 | if (!cfg80211_update_known_bss(rdev, found, tmp, signal_valid)) |
6b7c93c1 | 1835 | return NULL; |
2a519311 | 1836 | } else { |
9caf0364 | 1837 | struct cfg80211_internal_bss *new; |
dd9dfb9f | 1838 | struct cfg80211_internal_bss *hidden; |
9caf0364 | 1839 | struct cfg80211_bss_ies *ies; |
dd9dfb9f | 1840 | |
9caf0364 JB |
1841 | /* |
1842 | * create a copy -- the "res" variable that is passed in | |
1843 | * is allocated on the stack since it's not needed in the | |
1844 | * more common case of an update | |
1845 | */ | |
1b8ec87a | 1846 | new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size, |
9caf0364 JB |
1847 | GFP_ATOMIC); |
1848 | if (!new) { | |
1849 | ies = (void *)rcu_dereference(tmp->pub.beacon_ies); | |
1850 | if (ies) | |
1851 | kfree_rcu(ies, rcu_head); | |
1852 | ies = (void *)rcu_dereference(tmp->pub.proberesp_ies); | |
1853 | if (ies) | |
1854 | kfree_rcu(ies, rcu_head); | |
6b7c93c1 | 1855 | return NULL; |
9caf0364 JB |
1856 | } |
1857 | memcpy(new, tmp, sizeof(*new)); | |
776b3580 JB |
1858 | new->refcount = 1; |
1859 | INIT_LIST_HEAD(&new->hidden_list); | |
7011ba58 | 1860 | INIT_LIST_HEAD(&new->pub.nontrans_list); |
0b780881 JB |
1861 | /* we'll set this later if it was non-NULL */ |
1862 | new->pub.transmitted_bss = NULL; | |
776b3580 JB |
1863 | |
1864 | if (rcu_access_pointer(tmp->pub.proberesp_ies)) { | |
1b8ec87a | 1865 | hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN); |
776b3580 | 1866 | if (!hidden) |
1b8ec87a | 1867 | hidden = rb_find_bss(rdev, tmp, |
776b3580 JB |
1868 | BSS_CMP_HIDE_NUL); |
1869 | if (hidden) { | |
1870 | new->pub.hidden_beacon_bss = &hidden->pub; | |
1871 | list_add(&new->hidden_list, | |
1872 | &hidden->hidden_list); | |
1873 | hidden->refcount++; | |
32af9a9e BB |
1874 | |
1875 | ies = (void *)rcu_dereference(new->pub.beacon_ies); | |
776b3580 JB |
1876 | rcu_assign_pointer(new->pub.beacon_ies, |
1877 | hidden->pub.beacon_ies); | |
32af9a9e BB |
1878 | if (ies) |
1879 | kfree_rcu(ies, rcu_head); | |
776b3580 JB |
1880 | } |
1881 | } else { | |
1882 | /* | |
1883 | * Ok so we found a beacon, and don't have an entry. If | |
1884 | * it's a beacon with hidden SSID, we might be in for an | |
1885 | * expensive search for any probe responses that should | |
1886 | * be grouped with this beacon for updates ... | |
1887 | */ | |
1b8ec87a | 1888 | if (!cfg80211_combine_bsses(rdev, new)) { |
f9a5c358 | 1889 | bss_ref_put(rdev, new); |
6b7c93c1 | 1890 | return NULL; |
776b3580 JB |
1891 | } |
1892 | } | |
1893 | ||
9853a55e JB |
1894 | if (rdev->bss_entries >= bss_entries_limit && |
1895 | !cfg80211_bss_expire_oldest(rdev)) { | |
f9a5c358 | 1896 | bss_ref_put(rdev, new); |
6b7c93c1 | 1897 | return NULL; |
9853a55e JB |
1898 | } |
1899 | ||
a3584f56 | 1900 | /* This must be before the call to bss_ref_get */ |
0cd01efb | 1901 | if (tmp->pub.transmitted_bss) { |
0cd01efb | 1902 | new->pub.transmitted_bss = tmp->pub.transmitted_bss; |
61e41e5d | 1903 | bss_ref_get(rdev, bss_from_pub(tmp->pub.transmitted_bss)); |
a3584f56 SS |
1904 | } |
1905 | ||
1b8ec87a | 1906 | list_add_tail(&new->list, &rdev->bss_list); |
9853a55e | 1907 | rdev->bss_entries++; |
1b8ec87a | 1908 | rb_insert_bss(rdev, new); |
9caf0364 | 1909 | found = new; |
2a519311 JB |
1910 | } |
1911 | ||
1b8ec87a ZG |
1912 | rdev->bss_generation++; |
1913 | bss_ref_get(rdev, found); | |
2a519311 | 1914 | |
2a519311 | 1915 | return found; |
6b7c93c1 BB |
1916 | } |
1917 | ||
1918 | struct cfg80211_internal_bss * | |
1919 | cfg80211_bss_update(struct cfg80211_registered_device *rdev, | |
1920 | struct cfg80211_internal_bss *tmp, | |
1921 | bool signal_valid, unsigned long ts) | |
1922 | { | |
1923 | struct cfg80211_internal_bss *res; | |
1924 | ||
1925 | spin_lock_bh(&rdev->bss_lock); | |
1926 | res = __cfg80211_bss_update(rdev, tmp, signal_valid, ts); | |
1b8ec87a | 1927 | spin_unlock_bh(&rdev->bss_lock); |
6b7c93c1 BB |
1928 | |
1929 | return res; | |
2a519311 JB |
1930 | } |
1931 | ||
97981d89 | 1932 | int cfg80211_get_ies_channel_number(const u8 *ie, size_t ielen, |
6ff9efcf | 1933 | enum nl80211_band band) |
0172bb75 | 1934 | { |
75cca1fa | 1935 | const struct element *tmp; |
0172bb75 | 1936 | |
7f599aec | 1937 | if (band == NL80211_BAND_6GHZ) { |
7f599aec AB |
1938 | struct ieee80211_he_operation *he_oper; |
1939 | ||
75cca1fa JB |
1940 | tmp = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION, ie, |
1941 | ielen); | |
1942 | if (tmp && tmp->datalen >= sizeof(*he_oper) && | |
1943 | tmp->datalen >= ieee80211_he_oper_size(&tmp->data[1])) { | |
7f599aec AB |
1944 | const struct ieee80211_he_6ghz_oper *he_6ghz_oper; |
1945 | ||
75cca1fa | 1946 | he_oper = (void *)&tmp->data[1]; |
7f599aec AB |
1947 | |
1948 | he_6ghz_oper = ieee80211_he_6ghz_oper(he_oper); | |
1949 | if (!he_6ghz_oper) | |
75cca1fa | 1950 | return -1; |
7f599aec | 1951 | |
724a486c | 1952 | return he_6ghz_oper->primary; |
7f599aec AB |
1953 | } |
1954 | } else if (band == NL80211_BAND_S1GHZ) { | |
75cca1fa JB |
1955 | tmp = cfg80211_find_elem(WLAN_EID_S1G_OPERATION, ie, ielen); |
1956 | if (tmp && tmp->datalen >= sizeof(struct ieee80211_s1g_oper_ie)) { | |
1957 | struct ieee80211_s1g_oper_ie *s1gop = (void *)tmp->data; | |
66b0564d | 1958 | |
e847ffe2 | 1959 | return s1gop->oper_ch; |
66b0564d | 1960 | } |
0172bb75 | 1961 | } else { |
75cca1fa JB |
1962 | tmp = cfg80211_find_elem(WLAN_EID_DS_PARAMS, ie, ielen); |
1963 | if (tmp && tmp->datalen == 1) | |
1964 | return tmp->data[0]; | |
0172bb75 | 1965 | |
75cca1fa JB |
1966 | tmp = cfg80211_find_elem(WLAN_EID_HT_OPERATION, ie, ielen); |
1967 | if (tmp && | |
1968 | tmp->datalen >= sizeof(struct ieee80211_ht_operation)) { | |
1969 | struct ieee80211_ht_operation *htop = (void *)tmp->data; | |
1970 | ||
1971 | return htop->primary_chan; | |
0172bb75 JB |
1972 | } |
1973 | } | |
1974 | ||
75cca1fa | 1975 | return -1; |
97981d89 WG |
1976 | } |
1977 | EXPORT_SYMBOL(cfg80211_get_ies_channel_number); | |
1978 | ||
1979 | /* | |
1980 | * Update RX channel information based on the available frame payload | |
1981 | * information. This is mainly for the 2.4 GHz band where frames can be received | |
1982 | * from neighboring channels and the Beacon frames use the DSSS Parameter Set | |
1983 | * element to indicate the current (transmitting) channel, but this might also | |
1984 | * be needed on other bands if RX frequency does not match with the actual | |
7f599aec | 1985 | * operating channel of a BSS, or if the AP reports a different primary channel. |
97981d89 WG |
1986 | */ |
1987 | static struct ieee80211_channel * | |
1988 | cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen, | |
5add321c | 1989 | struct ieee80211_channel *channel) |
97981d89 WG |
1990 | { |
1991 | u32 freq; | |
1992 | int channel_number; | |
1993 | struct ieee80211_channel *alt_channel; | |
1994 | ||
7f599aec | 1995 | channel_number = cfg80211_get_ies_channel_number(ie, ielen, |
6ff9efcf | 1996 | channel->band); |
97981d89 | 1997 | |
119f94a6 JM |
1998 | if (channel_number < 0) { |
1999 | /* No channel information in frame payload */ | |
0172bb75 | 2000 | return channel; |
119f94a6 | 2001 | } |
0172bb75 | 2002 | |
934f4c7d | 2003 | freq = ieee80211_channel_to_freq_khz(channel_number, channel->band); |
7f599aec AB |
2004 | |
2005 | /* | |
fb4b441c MG |
2006 | * Frame info (beacon/prob res) is the same as received channel, |
2007 | * no need for further processing. | |
7f599aec | 2008 | */ |
fb4b441c | 2009 | if (freq == ieee80211_channel_to_khz(channel)) |
7f599aec AB |
2010 | return channel; |
2011 | ||
934f4c7d | 2012 | alt_channel = ieee80211_get_channel_khz(wiphy, freq); |
119f94a6 | 2013 | if (!alt_channel) { |
fb4b441c MG |
2014 | if (channel->band == NL80211_BAND_2GHZ || |
2015 | channel->band == NL80211_BAND_6GHZ) { | |
119f94a6 JM |
2016 | /* |
2017 | * Better not allow unexpected channels when that could | |
2018 | * be going beyond the 1-11 range (e.g., discovering | |
2019 | * BSS on channel 12 when radio is configured for | |
fb4b441c | 2020 | * channel 11) or beyond the 6 GHz channel range. |
119f94a6 JM |
2021 | */ |
2022 | return NULL; | |
2023 | } | |
2024 | ||
2025 | /* No match for the payload channel number - ignore it */ | |
2026 | return channel; | |
2027 | } | |
2028 | ||
119f94a6 JM |
2029 | /* |
2030 | * Use the channel determined through the payload channel number | |
2031 | * instead of the RX channel reported by the driver. | |
2032 | */ | |
2033 | if (alt_channel->flags & IEEE80211_CHAN_DISABLED) | |
0172bb75 | 2034 | return NULL; |
119f94a6 | 2035 | return alt_channel; |
0172bb75 JB |
2036 | } |
2037 | ||
eb142608 BB |
2038 | struct cfg80211_inform_single_bss_data { |
2039 | struct cfg80211_inform_bss *drv_data; | |
2040 | enum cfg80211_bss_frame_type ftype; | |
2481b5da | 2041 | struct ieee80211_channel *channel; |
eb142608 BB |
2042 | u8 bssid[ETH_ALEN]; |
2043 | u64 tsf; | |
2044 | u16 capability; | |
2045 | u16 beacon_interval; | |
2046 | const u8 *ie; | |
2047 | size_t ielen; | |
2048 | ||
2481b5da BB |
2049 | enum { |
2050 | BSS_SOURCE_DIRECT = 0, | |
2051 | BSS_SOURCE_MBSSID, | |
2052 | BSS_SOURCE_STA_PROFILE, | |
2053 | } bss_source; | |
2054 | /* Set if reporting bss_source != BSS_SOURCE_DIRECT */ | |
eb142608 BB |
2055 | struct cfg80211_bss *source_bss; |
2056 | u8 max_bssid_indicator; | |
2057 | u8 bssid_index; | |
d02a12b8 JB |
2058 | |
2059 | u8 use_for; | |
2060 | u64 cannot_use_reasons; | |
eb142608 BB |
2061 | }; |
2062 | ||
0e3a39b5 | 2063 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
0b8fb823 PX |
2064 | static struct cfg80211_bss * |
2065 | cfg80211_inform_single_bss_data(struct wiphy *wiphy, | |
eb142608 | 2066 | struct cfg80211_inform_single_bss_data *data, |
0b8fb823 | 2067 | gfp_t gfp) |
06aa7afa | 2068 | { |
0b8fb823 | 2069 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
eb142608 | 2070 | struct cfg80211_inform_bss *drv_data = data->drv_data; |
9caf0364 | 2071 | struct cfg80211_bss_ies *ies; |
3afc2167 | 2072 | struct ieee80211_channel *channel; |
7011ba58 | 2073 | struct cfg80211_internal_bss tmp = {}, *res; |
6eb18137 | 2074 | int bss_type; |
67af9811 | 2075 | bool signal_valid; |
60d7dfea | 2076 | unsigned long ts; |
06aa7afa JK |
2077 | |
2078 | if (WARN_ON(!wiphy)) | |
2079 | return NULL; | |
2080 | ||
22fe88d3 | 2081 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
eb142608 | 2082 | (drv_data->signal < 0 || drv_data->signal > 100))) |
06aa7afa JK |
2083 | return NULL; |
2084 | ||
2481b5da BB |
2085 | if (WARN_ON(data->bss_source != BSS_SOURCE_DIRECT && !data->source_bss)) |
2086 | return NULL; | |
2087 | ||
2088 | channel = data->channel; | |
2089 | if (!channel) | |
2090 | channel = cfg80211_get_bss_channel(wiphy, data->ie, data->ielen, | |
5add321c | 2091 | drv_data->chan); |
0172bb75 JB |
2092 | if (!channel) |
2093 | return NULL; | |
2094 | ||
eb142608 | 2095 | memcpy(tmp.pub.bssid, data->bssid, ETH_ALEN); |
9caf0364 | 2096 | tmp.pub.channel = channel; |
2481b5da BB |
2097 | if (data->bss_source != BSS_SOURCE_STA_PROFILE) |
2098 | tmp.pub.signal = drv_data->signal; | |
2099 | else | |
2100 | tmp.pub.signal = 0; | |
eb142608 BB |
2101 | tmp.pub.beacon_interval = data->beacon_interval; |
2102 | tmp.pub.capability = data->capability; | |
2103 | tmp.ts_boottime = drv_data->boottime_ns; | |
2104 | tmp.parent_tsf = drv_data->parent_tsf; | |
2105 | ether_addr_copy(tmp.parent_bssid, drv_data->parent_bssid); | |
d02a12b8 JB |
2106 | tmp.pub.use_for = data->use_for; |
2107 | tmp.pub.cannot_use_reasons = data->cannot_use_reasons; | |
eb142608 | 2108 | |
2481b5da | 2109 | if (data->bss_source != BSS_SOURCE_DIRECT) { |
eb142608 BB |
2110 | tmp.pub.transmitted_bss = data->source_bss; |
2111 | ts = bss_from_pub(data->source_bss)->ts; | |
2112 | tmp.pub.bssid_index = data->bssid_index; | |
2113 | tmp.pub.max_bssid_indicator = data->max_bssid_indicator; | |
60d7dfea JB |
2114 | } else { |
2115 | ts = jiffies; | |
c2edd301 BB |
2116 | |
2117 | if (channel->band == NL80211_BAND_60GHZ) { | |
eb142608 BB |
2118 | bss_type = data->capability & |
2119 | WLAN_CAPABILITY_DMG_TYPE_MASK; | |
c2edd301 BB |
2120 | if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP || |
2121 | bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS) | |
2122 | regulatory_hint_found_beacon(wiphy, channel, | |
2123 | gfp); | |
2124 | } else { | |
eb142608 | 2125 | if (data->capability & WLAN_CAPABILITY_ESS) |
c2edd301 BB |
2126 | regulatory_hint_found_beacon(wiphy, channel, |
2127 | gfp); | |
2128 | } | |
0cd01efb | 2129 | } |
6e19bc4b | 2130 | |
34a6eddb | 2131 | /* |
5bc8c1f2 | 2132 | * If we do not know here whether the IEs are from a Beacon or Probe |
34a6eddb JM |
2133 | * Response frame, we need to pick one of the options and only use it |
2134 | * with the driver that does not provide the full Beacon/Probe Response | |
2135 | * frame. Use Beacon frame pointer to avoid indicating that this should | |
50521aa8 | 2136 | * override the IEs pointer should we have received an earlier |
9caf0364 | 2137 | * indication of Probe Response data. |
34a6eddb | 2138 | */ |
eb142608 | 2139 | ies = kzalloc(sizeof(*ies) + data->ielen, gfp); |
9caf0364 JB |
2140 | if (!ies) |
2141 | return NULL; | |
eb142608 BB |
2142 | ies->len = data->ielen; |
2143 | ies->tsf = data->tsf; | |
0e227084 | 2144 | ies->from_beacon = false; |
eb142608 | 2145 | memcpy(ies->data, data->ie, data->ielen); |
06aa7afa | 2146 | |
eb142608 | 2147 | switch (data->ftype) { |
5bc8c1f2 JB |
2148 | case CFG80211_BSS_FTYPE_BEACON: |
2149 | ies->from_beacon = true; | |
7b506ff6 | 2150 | fallthrough; |
5bc8c1f2 JB |
2151 | case CFG80211_BSS_FTYPE_UNKNOWN: |
2152 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); | |
2153 | break; | |
2154 | case CFG80211_BSS_FTYPE_PRESP: | |
2155 | rcu_assign_pointer(tmp.pub.proberesp_ies, ies); | |
2156 | break; | |
2157 | } | |
9caf0364 | 2158 | rcu_assign_pointer(tmp.pub.ies, ies); |
06aa7afa | 2159 | |
eb142608 | 2160 | signal_valid = drv_data->chan == channel; |
6b7c93c1 BB |
2161 | spin_lock_bh(&rdev->bss_lock); |
2162 | res = __cfg80211_bss_update(rdev, &tmp, signal_valid, ts); | |
06aa7afa | 2163 | if (!res) |
6b7c93c1 | 2164 | goto drop; |
06aa7afa | 2165 | |
3e3929ef | 2166 | rdev_inform_bss(rdev, &res->pub, ies, drv_data->drv_data); |
5db25290 | 2167 | |
2481b5da | 2168 | if (data->bss_source == BSS_SOURCE_MBSSID) { |
0b8fb823 PX |
2169 | /* this is a nontransmitting bss, we need to add it to |
2170 | * transmitting bss' list if it is not there | |
2171 | */ | |
eb142608 | 2172 | if (cfg80211_add_nontrans_list(data->source_bss, &res->pub)) { |
0b780881 | 2173 | if (__cfg80211_unlink_bss(rdev, res)) { |
0b8fb823 | 2174 | rdev->bss_generation++; |
0b780881 JB |
2175 | res = NULL; |
2176 | } | |
0b8fb823 | 2177 | } |
0b780881 JB |
2178 | |
2179 | if (!res) | |
6b7c93c1 | 2180 | goto drop; |
0b8fb823 | 2181 | } |
6b7c93c1 | 2182 | spin_unlock_bh(&rdev->bss_lock); |
0b8fb823 | 2183 | |
4ee3e063 | 2184 | trace_cfg80211_return_bss(&res->pub); |
6b7c93c1 | 2185 | /* __cfg80211_bss_update gives us a referenced result */ |
06aa7afa | 2186 | return &res->pub; |
6b7c93c1 BB |
2187 | |
2188 | drop: | |
2189 | spin_unlock_bh(&rdev->bss_lock); | |
2190 | return NULL; | |
06aa7afa | 2191 | } |
06aa7afa | 2192 | |
fe806e49 SS |
2193 | static const struct element |
2194 | *cfg80211_get_profile_continuation(const u8 *ie, size_t ielen, | |
2195 | const struct element *mbssid_elem, | |
2196 | const struct element *sub_elem) | |
2197 | { | |
2198 | const u8 *mbssid_end = mbssid_elem->data + mbssid_elem->datalen; | |
2199 | const struct element *next_mbssid; | |
2200 | const struct element *next_sub; | |
2201 | ||
2202 | next_mbssid = cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID, | |
2203 | mbssid_end, | |
2204 | ielen - (mbssid_end - ie)); | |
2205 | ||
2206 | /* | |
8cf5c86d | 2207 | * If it is not the last subelement in current MBSSID IE or there isn't |
fe806e49 SS |
2208 | * a next MBSSID IE - profile is complete. |
2209 | */ | |
2210 | if ((sub_elem->data + sub_elem->datalen < mbssid_end - 1) || | |
2211 | !next_mbssid) | |
2212 | return NULL; | |
2213 | ||
2214 | /* For any length error, just return NULL */ | |
2215 | ||
2216 | if (next_mbssid->datalen < 4) | |
2217 | return NULL; | |
2218 | ||
2219 | next_sub = (void *)&next_mbssid->data[1]; | |
2220 | ||
2221 | if (next_mbssid->data + next_mbssid->datalen < | |
2222 | next_sub->data + next_sub->datalen) | |
2223 | return NULL; | |
2224 | ||
2225 | if (next_sub->id != 0 || next_sub->datalen < 2) | |
2226 | return NULL; | |
2227 | ||
2228 | /* | |
2229 | * Check if the first element in the next sub element is a start | |
2230 | * of a new profile | |
2231 | */ | |
2232 | return next_sub->data[0] == WLAN_EID_NON_TX_BSSID_CAP ? | |
2233 | NULL : next_mbssid; | |
2234 | } | |
2235 | ||
2236 | size_t cfg80211_merge_profile(const u8 *ie, size_t ielen, | |
2237 | const struct element *mbssid_elem, | |
2238 | const struct element *sub_elem, | |
5809a5d5 | 2239 | u8 *merged_ie, size_t max_copy_len) |
fe806e49 SS |
2240 | { |
2241 | size_t copied_len = sub_elem->datalen; | |
2242 | const struct element *next_mbssid; | |
2243 | ||
2244 | if (sub_elem->datalen > max_copy_len) | |
2245 | return 0; | |
2246 | ||
5809a5d5 | 2247 | memcpy(merged_ie, sub_elem->data, sub_elem->datalen); |
fe806e49 SS |
2248 | |
2249 | while ((next_mbssid = cfg80211_get_profile_continuation(ie, ielen, | |
2250 | mbssid_elem, | |
2251 | sub_elem))) { | |
2252 | const struct element *next_sub = (void *)&next_mbssid->data[1]; | |
2253 | ||
2254 | if (copied_len + next_sub->datalen > max_copy_len) | |
2255 | break; | |
5809a5d5 | 2256 | memcpy(merged_ie + copied_len, next_sub->data, |
fe806e49 SS |
2257 | next_sub->datalen); |
2258 | copied_len += next_sub->datalen; | |
2259 | } | |
2260 | ||
2261 | return copied_len; | |
2262 | } | |
2263 | EXPORT_SYMBOL(cfg80211_merge_profile); | |
2264 | ||
eb142608 BB |
2265 | static void |
2266 | cfg80211_parse_mbssid_data(struct wiphy *wiphy, | |
2267 | struct cfg80211_inform_single_bss_data *tx_data, | |
2268 | struct cfg80211_bss *source_bss, | |
2269 | gfp_t gfp) | |
0b8fb823 | 2270 | { |
eb142608 BB |
2271 | struct cfg80211_inform_single_bss_data data = { |
2272 | .drv_data = tx_data->drv_data, | |
2273 | .ftype = tx_data->ftype, | |
2274 | .tsf = tx_data->tsf, | |
2275 | .beacon_interval = tx_data->beacon_interval, | |
2276 | .source_bss = source_bss, | |
2481b5da | 2277 | .bss_source = BSS_SOURCE_MBSSID, |
d02a12b8 JB |
2278 | .use_for = tx_data->use_for, |
2279 | .cannot_use_reasons = tx_data->cannot_use_reasons, | |
eb142608 | 2280 | }; |
1c8745f3 JB |
2281 | const u8 *mbssid_index_ie; |
2282 | const struct element *elem, *sub; | |
fe806e49 SS |
2283 | u8 *new_ie, *profile; |
2284 | u64 seen_indices = 0; | |
0b8fb823 PX |
2285 | struct cfg80211_bss *bss; |
2286 | ||
eb142608 | 2287 | if (!source_bss) |
0b8fb823 | 2288 | return; |
eb142608 BB |
2289 | if (!cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID, |
2290 | tx_data->ie, tx_data->ielen)) | |
0b8fb823 | 2291 | return; |
213ed579 SS |
2292 | if (!wiphy->support_mbssid) |
2293 | return; | |
2294 | if (wiphy->support_only_he_mbssid && | |
eb142608 BB |
2295 | !cfg80211_find_ext_elem(WLAN_EID_EXT_HE_CAPABILITY, |
2296 | tx_data->ie, tx_data->ielen)) | |
213ed579 | 2297 | return; |
0b8fb823 | 2298 | |
0b8fb823 PX |
2299 | new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp); |
2300 | if (!new_ie) | |
2301 | return; | |
2302 | ||
eb142608 | 2303 | profile = kmalloc(tx_data->ielen, gfp); |
fe806e49 SS |
2304 | if (!profile) |
2305 | goto out; | |
2306 | ||
eb142608 BB |
2307 | for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, |
2308 | tx_data->ie, tx_data->ielen) { | |
1c8745f3 JB |
2309 | if (elem->datalen < 4) |
2310 | continue; | |
8f033d2b JB |
2311 | if (elem->data[0] < 1 || (int)elem->data[0] > 8) |
2312 | continue; | |
1c8745f3 | 2313 | for_each_element(sub, elem->data + 1, elem->datalen - 1) { |
fe806e49 SS |
2314 | u8 profile_len; |
2315 | ||
1c8745f3 | 2316 | if (sub->id != 0 || sub->datalen < 4) { |
0b8fb823 PX |
2317 | /* not a valid BSS profile */ |
2318 | continue; | |
2319 | } | |
2320 | ||
1c8745f3 JB |
2321 | if (sub->data[0] != WLAN_EID_NON_TX_BSSID_CAP || |
2322 | sub->data[1] != 2) { | |
0b8fb823 PX |
2323 | /* The first element within the Nontransmitted |
2324 | * BSSID Profile is not the Nontransmitted | |
2325 | * BSSID Capability element. | |
2326 | */ | |
2327 | continue; | |
2328 | } | |
2329 | ||
eb142608 BB |
2330 | memset(profile, 0, tx_data->ielen); |
2331 | profile_len = cfg80211_merge_profile(tx_data->ie, | |
2332 | tx_data->ielen, | |
fe806e49 SS |
2333 | elem, |
2334 | sub, | |
5809a5d5 | 2335 | profile, |
eb142608 | 2336 | tx_data->ielen); |
fe806e49 | 2337 | |
0b8fb823 PX |
2338 | /* found a Nontransmitted BSSID Profile */ |
2339 | mbssid_index_ie = cfg80211_find_ie | |
2340 | (WLAN_EID_MULTI_BSSID_IDX, | |
fe806e49 | 2341 | profile, profile_len); |
0b8fb823 | 2342 | if (!mbssid_index_ie || mbssid_index_ie[1] < 1 || |
fe806e49 SS |
2343 | mbssid_index_ie[2] == 0 || |
2344 | mbssid_index_ie[2] > 46) { | |
0b8fb823 PX |
2345 | /* No valid Multiple BSSID-Index element */ |
2346 | continue; | |
2347 | } | |
2348 | ||
ebb3ca3b | 2349 | if (seen_indices & BIT_ULL(mbssid_index_ie[2])) |
fe806e49 SS |
2350 | /* We don't support legacy split of a profile */ |
2351 | net_dbg_ratelimited("Partial info for BSSID index %d\n", | |
2352 | mbssid_index_ie[2]); | |
2353 | ||
ebb3ca3b | 2354 | seen_indices |= BIT_ULL(mbssid_index_ie[2]); |
fe806e49 | 2355 | |
eb142608 BB |
2356 | data.bssid_index = mbssid_index_ie[2]; |
2357 | data.max_bssid_indicator = elem->data[0]; | |
2358 | ||
2359 | cfg80211_gen_new_bssid(tx_data->bssid, | |
2360 | data.max_bssid_indicator, | |
2361 | data.bssid_index, | |
2362 | data.bssid); | |
0cd01efb | 2363 | |
0b8fb823 | 2364 | memset(new_ie, 0, IEEE80211_MAX_DATA_LEN); |
eb142608 BB |
2365 | data.ie = new_ie; |
2366 | data.ielen = cfg80211_gen_new_ie(tx_data->ie, | |
2367 | tx_data->ielen, | |
fe806e49 | 2368 | profile, |
eb142608 BB |
2369 | profile_len, |
2370 | new_ie, | |
dfd9aa3e | 2371 | IEEE80211_MAX_DATA_LEN); |
eb142608 | 2372 | if (!data.ielen) |
0b8fb823 PX |
2373 | continue; |
2374 | ||
eb142608 BB |
2375 | data.capability = get_unaligned_le16(profile + 2); |
2376 | bss = cfg80211_inform_single_bss_data(wiphy, &data, gfp); | |
0b8fb823 PX |
2377 | if (!bss) |
2378 | break; | |
2379 | cfg80211_put_bss(wiphy, bss); | |
2380 | } | |
0b8fb823 PX |
2381 | } |
2382 | ||
fe806e49 | 2383 | out: |
0b8fb823 | 2384 | kfree(new_ie); |
fe806e49 | 2385 | kfree(profile); |
0b8fb823 PX |
2386 | } |
2387 | ||
f837a653 BB |
2388 | ssize_t cfg80211_defragment_element(const struct element *elem, const u8 *ies, |
2389 | size_t ieslen, u8 *data, size_t data_len, | |
2390 | u8 frag_id) | |
2391 | { | |
2392 | const struct element *next; | |
2393 | ssize_t copied; | |
2394 | u8 elem_datalen; | |
2395 | ||
2396 | if (!elem) | |
2397 | return -EINVAL; | |
2398 | ||
2399 | /* elem might be invalid after the memmove */ | |
2400 | next = (void *)(elem->data + elem->datalen); | |
f837a653 | 2401 | elem_datalen = elem->datalen; |
43125539 | 2402 | |
f837a653 BB |
2403 | if (elem->id == WLAN_EID_EXTENSION) { |
2404 | copied = elem->datalen - 1; | |
2405 | if (copied > data_len) | |
2406 | return -ENOSPC; | |
2407 | ||
2408 | memmove(data, elem->data + 1, copied); | |
2409 | } else { | |
2410 | copied = elem->datalen; | |
2411 | if (copied > data_len) | |
2412 | return -ENOSPC; | |
2413 | ||
2414 | memmove(data, elem->data, copied); | |
2415 | } | |
2416 | ||
2417 | /* Fragmented elements must have 255 bytes */ | |
2418 | if (elem_datalen < 255) | |
2419 | return copied; | |
2420 | ||
2421 | for (elem = next; | |
2422 | elem->data < ies + ieslen && | |
43125539 | 2423 | elem->data + elem->datalen <= ies + ieslen; |
f837a653 BB |
2424 | elem = next) { |
2425 | /* elem might be invalid after the memmove */ | |
2426 | next = (void *)(elem->data + elem->datalen); | |
2427 | ||
2428 | if (elem->id != frag_id) | |
2429 | break; | |
2430 | ||
2431 | elem_datalen = elem->datalen; | |
2432 | ||
2433 | if (copied + elem_datalen > data_len) | |
2434 | return -ENOSPC; | |
2435 | ||
2436 | memmove(data + copied, elem->data, elem_datalen); | |
2437 | copied += elem_datalen; | |
2438 | ||
2439 | /* Only the last fragment may be short */ | |
2440 | if (elem_datalen != 255) | |
2441 | break; | |
2442 | } | |
2443 | ||
2444 | return copied; | |
2445 | } | |
2446 | EXPORT_SYMBOL(cfg80211_defragment_element); | |
2447 | ||
2481b5da BB |
2448 | struct cfg80211_mle { |
2449 | struct ieee80211_multi_link_elem *mle; | |
2450 | struct ieee80211_mle_per_sta_profile | |
2451 | *sta_prof[IEEE80211_MLD_MAX_NUM_LINKS]; | |
2452 | ssize_t sta_prof_len[IEEE80211_MLD_MAX_NUM_LINKS]; | |
2453 | ||
2454 | u8 data[]; | |
2455 | }; | |
2456 | ||
2457 | static struct cfg80211_mle * | |
2458 | cfg80211_defrag_mle(const struct element *mle, const u8 *ie, size_t ielen, | |
2459 | gfp_t gfp) | |
2460 | { | |
2461 | const struct element *elem; | |
2462 | struct cfg80211_mle *res; | |
2463 | size_t buf_len; | |
2464 | ssize_t mle_len; | |
2465 | u8 common_size, idx; | |
2466 | ||
2467 | if (!mle || !ieee80211_mle_size_ok(mle->data + 1, mle->datalen - 1)) | |
2468 | return NULL; | |
2469 | ||
2470 | /* Required length for first defragmentation */ | |
2471 | buf_len = mle->datalen - 1; | |
2472 | for_each_element(elem, mle->data + mle->datalen, | |
2473 | ielen - sizeof(*mle) + mle->datalen) { | |
2474 | if (elem->id != WLAN_EID_FRAGMENT) | |
2475 | break; | |
2476 | ||
2477 | buf_len += elem->datalen; | |
2478 | } | |
2479 | ||
2480 | res = kzalloc(struct_size(res, data, buf_len), gfp); | |
2481 | if (!res) | |
2482 | return NULL; | |
2483 | ||
2484 | mle_len = cfg80211_defragment_element(mle, ie, ielen, | |
2485 | res->data, buf_len, | |
2486 | WLAN_EID_FRAGMENT); | |
2487 | if (mle_len < 0) | |
2488 | goto error; | |
2489 | ||
2490 | res->mle = (void *)res->data; | |
2491 | ||
2492 | /* Find the sub-element area in the buffer */ | |
2493 | common_size = ieee80211_mle_common_size((u8 *)res->mle); | |
2494 | ie = res->data + common_size; | |
2495 | ielen = mle_len - common_size; | |
2496 | ||
2497 | idx = 0; | |
2498 | for_each_element_id(elem, IEEE80211_MLE_SUBELEM_PER_STA_PROFILE, | |
2499 | ie, ielen) { | |
2500 | res->sta_prof[idx] = (void *)elem->data; | |
2501 | res->sta_prof_len[idx] = elem->datalen; | |
2502 | ||
2503 | idx++; | |
2504 | if (idx >= IEEE80211_MLD_MAX_NUM_LINKS) | |
2505 | break; | |
2506 | } | |
2507 | if (!for_each_element_completed(elem, ie, ielen)) | |
2508 | goto error; | |
2509 | ||
2510 | /* Defragment sta_info in-place */ | |
2511 | for (idx = 0; idx < IEEE80211_MLD_MAX_NUM_LINKS && res->sta_prof[idx]; | |
2512 | idx++) { | |
2513 | if (res->sta_prof_len[idx] < 255) | |
2514 | continue; | |
2515 | ||
2516 | elem = (void *)res->sta_prof[idx] - 2; | |
2517 | ||
2518 | if (idx + 1 < ARRAY_SIZE(res->sta_prof) && | |
2519 | res->sta_prof[idx + 1]) | |
2520 | buf_len = (u8 *)res->sta_prof[idx + 1] - | |
2521 | (u8 *)res->sta_prof[idx]; | |
2522 | else | |
2523 | buf_len = ielen + ie - (u8 *)elem; | |
2524 | ||
2525 | res->sta_prof_len[idx] = | |
2526 | cfg80211_defragment_element(elem, | |
2527 | (u8 *)elem, buf_len, | |
2528 | (u8 *)res->sta_prof[idx], | |
2529 | buf_len, | |
2530 | IEEE80211_MLE_SUBELEM_FRAGMENT); | |
2531 | if (res->sta_prof_len[idx] < 0) | |
2532 | goto error; | |
2533 | } | |
2534 | ||
2535 | return res; | |
2536 | ||
2537 | error: | |
2538 | kfree(res); | |
2539 | return NULL; | |
2540 | } | |
2541 | ||
d02a12b8 | 2542 | static u8 |
2481b5da BB |
2543 | cfg80211_tbtt_info_for_mld_ap(const u8 *ie, size_t ielen, u8 mld_id, u8 link_id, |
2544 | const struct ieee80211_neighbor_ap_info **ap_info, | |
2545 | const u8 **tbtt_info) | |
2546 | { | |
2547 | const struct ieee80211_neighbor_ap_info *info; | |
2548 | const struct element *rnr; | |
2549 | const u8 *pos, *end; | |
2550 | ||
2551 | for_each_element_id(rnr, WLAN_EID_REDUCED_NEIGHBOR_REPORT, ie, ielen) { | |
2552 | pos = rnr->data; | |
2553 | end = rnr->data + rnr->datalen; | |
2554 | ||
2555 | /* RNR IE may contain more than one NEIGHBOR_AP_INFO */ | |
2556 | while (sizeof(*info) <= end - pos) { | |
2557 | const struct ieee80211_rnr_mld_params *mld_params; | |
2558 | u16 params; | |
2559 | u8 length, i, count, mld_params_offset; | |
2560 | u8 type, lid; | |
d02a12b8 | 2561 | u32 use_for; |
2481b5da BB |
2562 | |
2563 | info = (void *)pos; | |
2564 | count = u8_get_bits(info->tbtt_info_hdr, | |
2565 | IEEE80211_AP_INFO_TBTT_HDR_COUNT) + 1; | |
2566 | length = info->tbtt_info_len; | |
2567 | ||
2568 | pos += sizeof(*info); | |
2569 | ||
2570 | if (count * length > end - pos) | |
d02a12b8 | 2571 | return 0; |
2481b5da BB |
2572 | |
2573 | type = u8_get_bits(info->tbtt_info_hdr, | |
2574 | IEEE80211_AP_INFO_TBTT_HDR_TYPE); | |
2575 | ||
2481b5da BB |
2576 | if (type == IEEE80211_TBTT_INFO_TYPE_TBTT && |
2577 | length >= | |
2578 | offsetofend(struct ieee80211_tbtt_info_ge_11, | |
2579 | mld_params)) { | |
2580 | mld_params_offset = | |
2581 | offsetof(struct ieee80211_tbtt_info_ge_11, mld_params); | |
d02a12b8 JB |
2582 | use_for = NL80211_BSS_USE_FOR_ALL; |
2583 | } else if (type == IEEE80211_TBTT_INFO_TYPE_MLD && | |
2584 | length >= sizeof(struct ieee80211_rnr_mld_params)) { | |
2585 | mld_params_offset = 0; | |
2586 | use_for = NL80211_BSS_USE_FOR_MLD_LINK; | |
2481b5da BB |
2587 | } else { |
2588 | pos += count * length; | |
2589 | continue; | |
2590 | } | |
2591 | ||
2592 | for (i = 0; i < count; i++) { | |
2593 | mld_params = (void *)pos + mld_params_offset; | |
2594 | params = le16_to_cpu(mld_params->params); | |
2595 | ||
2596 | lid = u16_get_bits(params, | |
2597 | IEEE80211_RNR_MLD_PARAMS_LINK_ID); | |
2598 | ||
2599 | if (mld_id == mld_params->mld_id && | |
2600 | link_id == lid) { | |
2601 | *ap_info = info; | |
2602 | *tbtt_info = pos; | |
2603 | ||
d02a12b8 | 2604 | return use_for; |
2481b5da BB |
2605 | } |
2606 | ||
2607 | pos += length; | |
2608 | } | |
2609 | } | |
2610 | } | |
2611 | ||
d02a12b8 | 2612 | return 0; |
2481b5da BB |
2613 | } |
2614 | ||
2615 | static void cfg80211_parse_ml_sta_data(struct wiphy *wiphy, | |
2616 | struct cfg80211_inform_single_bss_data *tx_data, | |
2617 | struct cfg80211_bss *source_bss, | |
2618 | gfp_t gfp) | |
2619 | { | |
2620 | struct cfg80211_inform_single_bss_data data = { | |
2621 | .drv_data = tx_data->drv_data, | |
2622 | .ftype = tx_data->ftype, | |
2623 | .source_bss = source_bss, | |
2624 | .bss_source = BSS_SOURCE_STA_PROFILE, | |
2625 | }; | |
2626 | struct ieee80211_multi_link_elem *ml_elem; | |
2627 | const struct element *elem; | |
2628 | struct cfg80211_mle *mle; | |
2629 | u16 control; | |
5f478adf | 2630 | u8 ml_common_len; |
2481b5da BB |
2631 | u8 *new_ie; |
2632 | struct cfg80211_bss *bss; | |
2633 | int mld_id; | |
2634 | u16 seen_links = 0; | |
2635 | const u8 *pos; | |
2636 | u8 i; | |
2637 | ||
2638 | if (!source_bss) | |
2639 | return; | |
2640 | ||
2641 | if (tx_data->ftype != CFG80211_BSS_FTYPE_PRESP) | |
2642 | return; | |
2643 | ||
2644 | elem = cfg80211_find_ext_elem(WLAN_EID_EXT_EHT_MULTI_LINK, | |
2645 | tx_data->ie, tx_data->ielen); | |
2646 | if (!elem || !ieee80211_mle_size_ok(elem->data + 1, elem->datalen - 1)) | |
2647 | return; | |
2648 | ||
2649 | ml_elem = (void *)elem->data + 1; | |
2650 | control = le16_to_cpu(ml_elem->control); | |
2651 | if (u16_get_bits(control, IEEE80211_ML_CONTROL_TYPE) != | |
2652 | IEEE80211_ML_CONTROL_TYPE_BASIC) | |
2653 | return; | |
2654 | ||
2655 | /* Must be present when transmitted by an AP (in a probe response) */ | |
2656 | if (!(control & IEEE80211_MLC_BASIC_PRES_BSS_PARAM_CH_CNT) || | |
2657 | !(control & IEEE80211_MLC_BASIC_PRES_LINK_ID) || | |
2658 | !(control & IEEE80211_MLC_BASIC_PRES_MLD_CAPA_OP)) | |
2659 | return; | |
2660 | ||
5f478adf BB |
2661 | ml_common_len = ml_elem->variable[0]; |
2662 | ||
2481b5da BB |
2663 | /* length + MLD MAC address + link ID info + BSS Params Change Count */ |
2664 | pos = ml_elem->variable + 1 + 6 + 1 + 1; | |
2665 | ||
2666 | if (u16_get_bits(control, IEEE80211_MLC_BASIC_PRES_MED_SYNC_DELAY)) | |
2667 | pos += 2; | |
2668 | if (u16_get_bits(control, IEEE80211_MLC_BASIC_PRES_EML_CAPA)) | |
2669 | pos += 2; | |
2670 | ||
2671 | /* MLD capabilities and operations */ | |
2672 | pos += 2; | |
2673 | ||
2674 | /* Not included when the (nontransmitted) AP is responding itself, | |
2675 | * but defined to zero then (Draft P802.11be_D3.0, 9.4.2.170.2) | |
2676 | */ | |
2677 | if (u16_get_bits(control, IEEE80211_MLC_BASIC_PRES_MLD_ID)) { | |
2678 | mld_id = *pos; | |
2679 | pos += 1; | |
2680 | } else { | |
2681 | mld_id = 0; | |
2682 | } | |
2683 | ||
2684 | /* Extended MLD capabilities and operations */ | |
2685 | pos += 2; | |
2686 | ||
2687 | /* Fully defrag the ML element for sta information/profile iteration */ | |
2688 | mle = cfg80211_defrag_mle(elem, tx_data->ie, tx_data->ielen, gfp); | |
2689 | if (!mle) | |
2690 | return; | |
2691 | ||
2692 | new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp); | |
2693 | if (!new_ie) | |
2694 | goto out; | |
2695 | ||
2696 | for (i = 0; i < ARRAY_SIZE(mle->sta_prof) && mle->sta_prof[i]; i++) { | |
2697 | const struct ieee80211_neighbor_ap_info *ap_info; | |
2698 | enum nl80211_band band; | |
2699 | u32 freq; | |
2700 | const u8 *profile; | |
2701 | const u8 *tbtt_info; | |
2702 | ssize_t profile_len; | |
d02a12b8 | 2703 | u8 link_id, use_for; |
2481b5da BB |
2704 | |
2705 | if (!ieee80211_mle_basic_sta_prof_size_ok((u8 *)mle->sta_prof[i], | |
2706 | mle->sta_prof_len[i])) | |
2707 | continue; | |
2708 | ||
2709 | control = le16_to_cpu(mle->sta_prof[i]->control); | |
2710 | ||
2711 | if (!(control & IEEE80211_MLE_STA_CONTROL_COMPLETE_PROFILE)) | |
2712 | continue; | |
2713 | ||
2714 | link_id = u16_get_bits(control, | |
2715 | IEEE80211_MLE_STA_CONTROL_LINK_ID); | |
2716 | if (seen_links & BIT(link_id)) | |
2717 | break; | |
2718 | seen_links |= BIT(link_id); | |
2719 | ||
2720 | if (!(control & IEEE80211_MLE_STA_CONTROL_BEACON_INT_PRESENT) || | |
2721 | !(control & IEEE80211_MLE_STA_CONTROL_TSF_OFFS_PRESENT) || | |
2722 | !(control & IEEE80211_MLE_STA_CONTROL_STA_MAC_ADDR_PRESENT)) | |
2723 | continue; | |
2724 | ||
2725 | memcpy(data.bssid, mle->sta_prof[i]->variable, ETH_ALEN); | |
2726 | data.beacon_interval = | |
2727 | get_unaligned_le16(mle->sta_prof[i]->variable + 6); | |
2728 | data.tsf = tx_data->tsf + | |
2729 | get_unaligned_le64(mle->sta_prof[i]->variable + 8); | |
2730 | ||
2731 | /* sta_info_len counts itself */ | |
2732 | profile = mle->sta_prof[i]->variable + | |
2733 | mle->sta_prof[i]->sta_info_len - 1; | |
2734 | profile_len = (u8 *)mle->sta_prof[i] + mle->sta_prof_len[i] - | |
2735 | profile; | |
2736 | ||
2737 | if (profile_len < 2) | |
2738 | continue; | |
2739 | ||
2740 | data.capability = get_unaligned_le16(profile); | |
2741 | profile += 2; | |
2742 | profile_len -= 2; | |
2743 | ||
2744 | /* Find in RNR to look up channel information */ | |
d02a12b8 JB |
2745 | use_for = cfg80211_tbtt_info_for_mld_ap(tx_data->ie, |
2746 | tx_data->ielen, | |
2747 | mld_id, link_id, | |
2748 | &ap_info, &tbtt_info); | |
2749 | if (!use_for) | |
2481b5da BB |
2750 | continue; |
2751 | ||
2752 | /* We could sanity check the BSSID is included */ | |
2753 | ||
2754 | if (!ieee80211_operating_class_to_band(ap_info->op_class, | |
2755 | &band)) | |
2756 | continue; | |
2757 | ||
2758 | freq = ieee80211_channel_to_freq_khz(ap_info->channel, band); | |
2759 | data.channel = ieee80211_get_channel_khz(wiphy, freq); | |
2760 | ||
d02a12b8 JB |
2761 | if (use_for == NL80211_BSS_USE_FOR_MLD_LINK && |
2762 | !(wiphy->flags & WIPHY_FLAG_SUPPORTS_NSTR_NONPRIMARY)) { | |
2763 | use_for = 0; | |
2764 | data.cannot_use_reasons = | |
2765 | NL80211_BSS_CANNOT_USE_NSTR_NONPRIMARY; | |
2766 | } | |
2767 | data.use_for = use_for; | |
2768 | ||
2481b5da BB |
2769 | /* Generate new elements */ |
2770 | memset(new_ie, 0, IEEE80211_MAX_DATA_LEN); | |
2771 | data.ie = new_ie; | |
2772 | data.ielen = cfg80211_gen_new_ie(tx_data->ie, tx_data->ielen, | |
2773 | profile, profile_len, | |
2774 | new_ie, | |
2775 | IEEE80211_MAX_DATA_LEN); | |
2776 | if (!data.ielen) | |
2777 | continue; | |
2778 | ||
5f478adf BB |
2779 | /* The generated elements do not contain: |
2780 | * - Basic ML element | |
2781 | * - A TBTT entry in the RNR for the transmitting AP | |
2782 | * | |
2783 | * This information is needed both internally and in userspace | |
2784 | * as such, we should append it here. | |
2785 | */ | |
2786 | if (data.ielen + 3 + sizeof(*ml_elem) + ml_common_len > | |
2787 | IEEE80211_MAX_DATA_LEN) | |
2788 | continue; | |
2789 | ||
2790 | /* Copy the Basic Multi-Link element including the common | |
2791 | * information, and then fix up the link ID. | |
2792 | * Note that the ML element length has been verified and we | |
2793 | * also checked that it contains the link ID. | |
2794 | */ | |
2795 | new_ie[data.ielen++] = WLAN_EID_EXTENSION; | |
2796 | new_ie[data.ielen++] = 1 + sizeof(*ml_elem) + ml_common_len; | |
2797 | new_ie[data.ielen++] = WLAN_EID_EXT_EHT_MULTI_LINK; | |
2798 | memcpy(new_ie + data.ielen, ml_elem, | |
2799 | sizeof(*ml_elem) + ml_common_len); | |
2800 | ||
2801 | new_ie[data.ielen + sizeof(*ml_elem) + 1 + ETH_ALEN] = link_id; | |
2802 | ||
2803 | data.ielen += sizeof(*ml_elem) + ml_common_len; | |
2804 | ||
2805 | /* TODO: Add an RNR containing only the reporting AP */ | |
2806 | ||
2481b5da BB |
2807 | bss = cfg80211_inform_single_bss_data(wiphy, &data, gfp); |
2808 | if (!bss) | |
2809 | break; | |
2810 | cfg80211_put_bss(wiphy, bss); | |
2811 | } | |
2812 | ||
2813 | out: | |
2814 | kfree(new_ie); | |
2815 | kfree(mle); | |
2816 | } | |
2817 | ||
2a519311 | 2818 | struct cfg80211_bss * |
0b8fb823 PX |
2819 | cfg80211_inform_bss_data(struct wiphy *wiphy, |
2820 | struct cfg80211_inform_bss *data, | |
2821 | enum cfg80211_bss_frame_type ftype, | |
2822 | const u8 *bssid, u64 tsf, u16 capability, | |
2823 | u16 beacon_interval, const u8 *ie, size_t ielen, | |
2824 | gfp_t gfp) | |
2825 | { | |
eb142608 BB |
2826 | struct cfg80211_inform_single_bss_data inform_data = { |
2827 | .drv_data = data, | |
2828 | .ftype = ftype, | |
2829 | .tsf = tsf, | |
2830 | .capability = capability, | |
2831 | .beacon_interval = beacon_interval, | |
2832 | .ie = ie, | |
2833 | .ielen = ielen, | |
d02a12b8 JB |
2834 | .use_for = data->restrict_use ? |
2835 | data->use_for : | |
2836 | NL80211_BSS_USE_FOR_ALL, | |
2837 | .cannot_use_reasons = data->cannot_use_reasons, | |
eb142608 | 2838 | }; |
0b8fb823 PX |
2839 | struct cfg80211_bss *res; |
2840 | ||
eb142608 BB |
2841 | memcpy(inform_data.bssid, bssid, ETH_ALEN); |
2842 | ||
2843 | res = cfg80211_inform_single_bss_data(wiphy, &inform_data, gfp); | |
b0d1d7ff JB |
2844 | if (!res) |
2845 | return NULL; | |
eb142608 BB |
2846 | |
2847 | cfg80211_parse_mbssid_data(wiphy, &inform_data, res, gfp); | |
2481b5da BB |
2848 | |
2849 | cfg80211_parse_ml_sta_data(wiphy, &inform_data, res, gfp); | |
2850 | ||
0b8fb823 PX |
2851 | return res; |
2852 | } | |
2853 | EXPORT_SYMBOL(cfg80211_inform_bss_data); | |
2854 | ||
645f3d85 MS |
2855 | static bool cfg80211_uhb_power_type_valid(const u8 *ie, |
2856 | size_t ielen, | |
2857 | const u32 flags) | |
2858 | { | |
2859 | const struct element *tmp; | |
2860 | struct ieee80211_he_operation *he_oper; | |
2861 | ||
2862 | tmp = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION, ie, ielen); | |
2863 | if (tmp && tmp->datalen >= sizeof(*he_oper) + 1) { | |
2864 | const struct ieee80211_he_6ghz_oper *he_6ghz_oper; | |
2865 | ||
2866 | he_oper = (void *)&tmp->data[1]; | |
2867 | he_6ghz_oper = ieee80211_he_6ghz_oper(he_oper); | |
2868 | ||
2869 | if (!he_6ghz_oper) | |
2870 | return false; | |
2871 | ||
2872 | switch (u8_get_bits(he_6ghz_oper->control, | |
2873 | IEEE80211_HE_6GHZ_OPER_CTRL_REG_INFO)) { | |
2874 | case IEEE80211_6GHZ_CTRL_REG_LPI_AP: | |
2875 | return true; | |
2876 | case IEEE80211_6GHZ_CTRL_REG_SP_AP: | |
2877 | return !(flags & IEEE80211_CHAN_NO_UHB_AFC_CLIENT); | |
2878 | case IEEE80211_6GHZ_CTRL_REG_VLP_AP: | |
2879 | return !(flags & IEEE80211_CHAN_NO_UHB_VLP_CLIENT); | |
2880 | } | |
2881 | } | |
2882 | return false; | |
2883 | } | |
2884 | ||
0b8fb823 PX |
2885 | /* cfg80211_inform_bss_width_frame helper */ |
2886 | static struct cfg80211_bss * | |
2887 | cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy, | |
2888 | struct cfg80211_inform_bss *data, | |
2889 | struct ieee80211_mgmt *mgmt, size_t len, | |
0b8fb823 | 2890 | gfp_t gfp) |
2a519311 | 2891 | { |
6b7c93c1 | 2892 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
9caf0364 JB |
2893 | struct cfg80211_internal_bss tmp = {}, *res; |
2894 | struct cfg80211_bss_ies *ies; | |
3afc2167 | 2895 | struct ieee80211_channel *channel; |
67af9811 | 2896 | bool signal_valid; |
9eaffe50 TP |
2897 | struct ieee80211_ext *ext = NULL; |
2898 | u8 *bssid, *variable; | |
2899 | u16 capability, beacon_int; | |
2900 | size_t ielen, min_hdr_len = offsetof(struct ieee80211_mgmt, | |
2901 | u.probe_resp.variable); | |
6eb18137 | 2902 | int bss_type; |
bef9bacc | 2903 | |
0172bb75 JB |
2904 | BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) != |
2905 | offsetof(struct ieee80211_mgmt, u.beacon.variable)); | |
2906 | ||
6e19bc4b | 2907 | trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len); |
4ee3e063 | 2908 | |
bef9bacc MK |
2909 | if (WARN_ON(!mgmt)) |
2910 | return NULL; | |
2911 | ||
2912 | if (WARN_ON(!wiphy)) | |
2913 | return NULL; | |
2a519311 | 2914 | |
22fe88d3 | 2915 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
6e19bc4b | 2916 | (data->signal < 0 || data->signal > 100))) |
2a519311 JB |
2917 | return NULL; |
2918 | ||
9eaffe50 TP |
2919 | if (ieee80211_is_s1g_beacon(mgmt->frame_control)) { |
2920 | ext = (void *) mgmt; | |
2921 | min_hdr_len = offsetof(struct ieee80211_ext, u.s1g_beacon); | |
2922 | if (ieee80211_is_s1g_short_beacon(mgmt->frame_control)) | |
2923 | min_hdr_len = offsetof(struct ieee80211_ext, | |
2924 | u.s1g_short_beacon.variable); | |
2925 | } | |
2926 | ||
2927 | if (WARN_ON(len < min_hdr_len)) | |
2a519311 JB |
2928 | return NULL; |
2929 | ||
9eaffe50 TP |
2930 | ielen = len - min_hdr_len; |
2931 | variable = mgmt->u.probe_resp.variable; | |
2932 | if (ext) { | |
2933 | if (ieee80211_is_s1g_short_beacon(mgmt->frame_control)) | |
2934 | variable = ext->u.s1g_short_beacon.variable; | |
2935 | else | |
2936 | variable = ext->u.s1g_beacon.variable; | |
2937 | } | |
2938 | ||
5add321c | 2939 | channel = cfg80211_get_bss_channel(wiphy, variable, ielen, data->chan); |
0172bb75 JB |
2940 | if (!channel) |
2941 | return NULL; | |
2942 | ||
645f3d85 MS |
2943 | if (channel->band == NL80211_BAND_6GHZ && |
2944 | !cfg80211_uhb_power_type_valid(variable, ielen, channel->flags)) { | |
2945 | data->restrict_use = 1; | |
2946 | data->use_for = 0; | |
2947 | data->cannot_use_reasons = | |
2948 | NL80211_BSS_CANNOT_USE_UHB_PWR_MISMATCH; | |
2949 | } | |
2950 | ||
9eaffe50 | 2951 | if (ext) { |
b5ac0146 JB |
2952 | const struct ieee80211_s1g_bcn_compat_ie *compat; |
2953 | const struct element *elem; | |
9eaffe50 | 2954 | |
b5ac0146 JB |
2955 | elem = cfg80211_find_elem(WLAN_EID_S1G_BCN_COMPAT, |
2956 | variable, ielen); | |
2957 | if (!elem) | |
2958 | return NULL; | |
2959 | if (elem->datalen < sizeof(*compat)) | |
9eaffe50 | 2960 | return NULL; |
b5ac0146 | 2961 | compat = (void *)elem->data; |
9eaffe50 TP |
2962 | bssid = ext->u.s1g_beacon.sa; |
2963 | capability = le16_to_cpu(compat->compat_info); | |
2964 | beacon_int = le16_to_cpu(compat->beacon_int); | |
2965 | } else { | |
2966 | bssid = mgmt->bssid; | |
2967 | beacon_int = le16_to_cpu(mgmt->u.probe_resp.beacon_int); | |
2968 | capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); | |
2969 | } | |
2970 | ||
c2edd301 BB |
2971 | if (channel->band == NL80211_BAND_60GHZ) { |
2972 | bss_type = capability & WLAN_CAPABILITY_DMG_TYPE_MASK; | |
2973 | if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP || | |
2974 | bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS) | |
2975 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
2976 | } else { | |
2977 | if (capability & WLAN_CAPABILITY_ESS) | |
2978 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
2979 | } | |
2980 | ||
0e227084 | 2981 | ies = kzalloc(sizeof(*ies) + ielen, gfp); |
9caf0364 | 2982 | if (!ies) |
2a519311 | 2983 | return NULL; |
9caf0364 | 2984 | ies->len = ielen; |
8cef2c9d | 2985 | ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); |
9eaffe50 TP |
2986 | ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control) || |
2987 | ieee80211_is_s1g_beacon(mgmt->frame_control); | |
2988 | memcpy(ies->data, variable, ielen); | |
2a519311 | 2989 | |
9caf0364 JB |
2990 | if (ieee80211_is_probe_resp(mgmt->frame_control)) |
2991 | rcu_assign_pointer(tmp.pub.proberesp_ies, ies); | |
2992 | else | |
2993 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); | |
2994 | rcu_assign_pointer(tmp.pub.ies, ies); | |
505a2e88 | 2995 | |
9eaffe50 TP |
2996 | memcpy(tmp.pub.bssid, bssid, ETH_ALEN); |
2997 | tmp.pub.beacon_interval = beacon_int; | |
2998 | tmp.pub.capability = capability; | |
9caf0364 | 2999 | tmp.pub.channel = channel; |
6e19bc4b | 3000 | tmp.pub.signal = data->signal; |
6e19bc4b | 3001 | tmp.ts_boottime = data->boottime_ns; |
1d76250b | 3002 | tmp.parent_tsf = data->parent_tsf; |
983dafaa SD |
3003 | tmp.pub.chains = data->chains; |
3004 | memcpy(tmp.pub.chain_signal, data->chain_signal, IEEE80211_MAX_CHAINS); | |
1d76250b | 3005 | ether_addr_copy(tmp.parent_bssid, data->parent_bssid); |
d02a12b8 JB |
3006 | tmp.pub.use_for = data->restrict_use ? |
3007 | data->use_for : | |
3008 | NL80211_BSS_USE_FOR_ALL; | |
3009 | tmp.pub.cannot_use_reasons = data->cannot_use_reasons; | |
9caf0364 | 3010 | |
7bb106eb | 3011 | signal_valid = data->chan == channel; |
6b7c93c1 BB |
3012 | spin_lock_bh(&rdev->bss_lock); |
3013 | res = __cfg80211_bss_update(rdev, &tmp, signal_valid, jiffies); | |
2a519311 | 3014 | if (!res) |
6b7c93c1 BB |
3015 | goto drop; |
3016 | ||
5db25290 BB |
3017 | rdev_inform_bss(rdev, &res->pub, ies, data->drv_data); |
3018 | ||
6b7c93c1 | 3019 | spin_unlock_bh(&rdev->bss_lock); |
2a519311 | 3020 | |
4ee3e063 | 3021 | trace_cfg80211_return_bss(&res->pub); |
6b7c93c1 | 3022 | /* __cfg80211_bss_update gives us a referenced result */ |
2a519311 | 3023 | return &res->pub; |
6b7c93c1 BB |
3024 | |
3025 | drop: | |
3026 | spin_unlock_bh(&rdev->bss_lock); | |
3027 | return NULL; | |
2a519311 | 3028 | } |
0b8fb823 PX |
3029 | |
3030 | struct cfg80211_bss * | |
3031 | cfg80211_inform_bss_frame_data(struct wiphy *wiphy, | |
3032 | struct cfg80211_inform_bss *data, | |
3033 | struct ieee80211_mgmt *mgmt, size_t len, | |
3034 | gfp_t gfp) | |
3035 | { | |
eb142608 BB |
3036 | struct cfg80211_inform_single_bss_data inform_data = { |
3037 | .drv_data = data, | |
3038 | .ie = mgmt->u.probe_resp.variable, | |
3039 | .ielen = len - offsetof(struct ieee80211_mgmt, | |
3040 | u.probe_resp.variable), | |
d02a12b8 JB |
3041 | .use_for = data->restrict_use ? |
3042 | data->use_for : | |
3043 | NL80211_BSS_USE_FOR_ALL, | |
3044 | .cannot_use_reasons = data->cannot_use_reasons, | |
eb142608 | 3045 | }; |
39432f8a | 3046 | struct cfg80211_bss *res; |
0b8fb823 PX |
3047 | |
3048 | res = cfg80211_inform_single_bss_frame_data(wiphy, data, mgmt, | |
84f1772b | 3049 | len, gfp); |
39432f8a BB |
3050 | if (!res) |
3051 | return NULL; | |
acd3c92a | 3052 | |
2481b5da | 3053 | /* don't do any further MBSSID/ML handling for S1G */ |
acd3c92a JB |
3054 | if (ieee80211_is_s1g_beacon(mgmt->frame_control)) |
3055 | return res; | |
3056 | ||
eb142608 | 3057 | inform_data.ftype = ieee80211_is_beacon(mgmt->frame_control) ? |
39432f8a | 3058 | CFG80211_BSS_FTYPE_BEACON : CFG80211_BSS_FTYPE_PRESP; |
eb142608 BB |
3059 | memcpy(inform_data.bssid, mgmt->bssid, ETH_ALEN); |
3060 | inform_data.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); | |
3061 | inform_data.beacon_interval = | |
3062 | le16_to_cpu(mgmt->u.probe_resp.beacon_int); | |
461c4c2b | 3063 | |
39432f8a | 3064 | /* process each non-transmitting bss */ |
eb142608 | 3065 | cfg80211_parse_mbssid_data(wiphy, &inform_data, res, gfp); |
0b8fb823 | 3066 | |
2481b5da BB |
3067 | cfg80211_parse_ml_sta_data(wiphy, &inform_data, res, gfp); |
3068 | ||
0b8fb823 PX |
3069 | return res; |
3070 | } | |
6e19bc4b | 3071 | EXPORT_SYMBOL(cfg80211_inform_bss_frame_data); |
2a519311 | 3072 | |
5b112d3d | 3073 | void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
4c0c0b75 | 3074 | { |
f26cbf40 | 3075 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
4c0c0b75 JB |
3076 | |
3077 | if (!pub) | |
3078 | return; | |
3079 | ||
1b8ec87a | 3080 | spin_lock_bh(&rdev->bss_lock); |
61e41e5d | 3081 | bss_ref_get(rdev, bss_from_pub(pub)); |
1b8ec87a | 3082 | spin_unlock_bh(&rdev->bss_lock); |
4c0c0b75 JB |
3083 | } |
3084 | EXPORT_SYMBOL(cfg80211_ref_bss); | |
3085 | ||
5b112d3d | 3086 | void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
2a519311 | 3087 | { |
f26cbf40 | 3088 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
2a519311 JB |
3089 | |
3090 | if (!pub) | |
3091 | return; | |
3092 | ||
1b8ec87a | 3093 | spin_lock_bh(&rdev->bss_lock); |
61e41e5d | 3094 | bss_ref_put(rdev, bss_from_pub(pub)); |
1b8ec87a | 3095 | spin_unlock_bh(&rdev->bss_lock); |
2a519311 JB |
3096 | } |
3097 | EXPORT_SYMBOL(cfg80211_put_bss); | |
3098 | ||
d491af19 JB |
3099 | void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
3100 | { | |
f26cbf40 | 3101 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
7011ba58 SS |
3102 | struct cfg80211_internal_bss *bss, *tmp1; |
3103 | struct cfg80211_bss *nontrans_bss, *tmp; | |
d491af19 JB |
3104 | |
3105 | if (WARN_ON(!pub)) | |
3106 | return; | |
3107 | ||
61e41e5d | 3108 | bss = bss_from_pub(pub); |
d491af19 | 3109 | |
1b8ec87a | 3110 | spin_lock_bh(&rdev->bss_lock); |
7011ba58 SS |
3111 | if (list_empty(&bss->list)) |
3112 | goto out; | |
3113 | ||
3114 | list_for_each_entry_safe(nontrans_bss, tmp, | |
3115 | &pub->nontrans_list, | |
3116 | nontrans_list) { | |
61e41e5d | 3117 | tmp1 = bss_from_pub(nontrans_bss); |
7011ba58 | 3118 | if (__cfg80211_unlink_bss(rdev, tmp1)) |
1b8ec87a | 3119 | rdev->bss_generation++; |
3207390a | 3120 | } |
7011ba58 SS |
3121 | |
3122 | if (__cfg80211_unlink_bss(rdev, bss)) | |
3123 | rdev->bss_generation++; | |
3124 | out: | |
1b8ec87a | 3125 | spin_unlock_bh(&rdev->bss_lock); |
d491af19 JB |
3126 | } |
3127 | EXPORT_SYMBOL(cfg80211_unlink_bss); | |
3128 | ||
4770c8f9 IP |
3129 | void cfg80211_bss_iter(struct wiphy *wiphy, |
3130 | struct cfg80211_chan_def *chandef, | |
3131 | void (*iter)(struct wiphy *wiphy, | |
3132 | struct cfg80211_bss *bss, | |
3133 | void *data), | |
3134 | void *iter_data) | |
3135 | { | |
3136 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); | |
3137 | struct cfg80211_internal_bss *bss; | |
3138 | ||
3139 | spin_lock_bh(&rdev->bss_lock); | |
3140 | ||
3141 | list_for_each_entry(bss, &rdev->bss_list, list) { | |
7b0a0e3c JB |
3142 | if (!chandef || cfg80211_is_sub_chan(chandef, bss->pub.channel, |
3143 | false)) | |
4770c8f9 IP |
3144 | iter(wiphy, &bss->pub, iter_data); |
3145 | } | |
3146 | ||
3147 | spin_unlock_bh(&rdev->bss_lock); | |
3148 | } | |
3149 | EXPORT_SYMBOL(cfg80211_bss_iter); | |
3150 | ||
0afd425b | 3151 | void cfg80211_update_assoc_bss_entry(struct wireless_dev *wdev, |
7b0a0e3c | 3152 | unsigned int link_id, |
0afd425b SM |
3153 | struct ieee80211_channel *chan) |
3154 | { | |
3155 | struct wiphy *wiphy = wdev->wiphy; | |
3156 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); | |
7b0a0e3c | 3157 | struct cfg80211_internal_bss *cbss = wdev->links[link_id].client.current_bss; |
0afd425b SM |
3158 | struct cfg80211_internal_bss *new = NULL; |
3159 | struct cfg80211_internal_bss *bss; | |
3160 | struct cfg80211_bss *nontrans_bss; | |
3161 | struct cfg80211_bss *tmp; | |
3162 | ||
3163 | spin_lock_bh(&rdev->bss_lock); | |
3164 | ||
05dcb8bb IP |
3165 | /* |
3166 | * Some APs use CSA also for bandwidth changes, i.e., without actually | |
3167 | * changing the control channel, so no need to update in such a case. | |
3168 | */ | |
3169 | if (cbss->pub.channel == chan) | |
0afd425b SM |
3170 | goto done; |
3171 | ||
3172 | /* use transmitting bss */ | |
3173 | if (cbss->pub.transmitted_bss) | |
61e41e5d | 3174 | cbss = bss_from_pub(cbss->pub.transmitted_bss); |
0afd425b SM |
3175 | |
3176 | cbss->pub.channel = chan; | |
3177 | ||
3178 | list_for_each_entry(bss, &rdev->bss_list, list) { | |
3179 | if (!cfg80211_bss_type_match(bss->pub.capability, | |
3180 | bss->pub.channel->band, | |
3181 | wdev->conn_bss_type)) | |
3182 | continue; | |
3183 | ||
3184 | if (bss == cbss) | |
3185 | continue; | |
3186 | ||
3187 | if (!cmp_bss(&bss->pub, &cbss->pub, BSS_CMP_REGULAR)) { | |
3188 | new = bss; | |
3189 | break; | |
3190 | } | |
3191 | } | |
3192 | ||
3193 | if (new) { | |
3194 | /* to save time, update IEs for transmitting bss only */ | |
3195 | if (cfg80211_update_known_bss(rdev, cbss, new, false)) { | |
3196 | new->pub.proberesp_ies = NULL; | |
3197 | new->pub.beacon_ies = NULL; | |
3198 | } | |
3199 | ||
3200 | list_for_each_entry_safe(nontrans_bss, tmp, | |
3201 | &new->pub.nontrans_list, | |
3202 | nontrans_list) { | |
61e41e5d | 3203 | bss = bss_from_pub(nontrans_bss); |
0afd425b SM |
3204 | if (__cfg80211_unlink_bss(rdev, bss)) |
3205 | rdev->bss_generation++; | |
3206 | } | |
3207 | ||
3208 | WARN_ON(atomic_read(&new->hold)); | |
3209 | if (!WARN_ON(!__cfg80211_unlink_bss(rdev, new))) | |
3210 | rdev->bss_generation++; | |
3211 | } | |
3212 | ||
3213 | rb_erase(&cbss->rbn, &rdev->bss_tree); | |
3214 | rb_insert_bss(rdev, cbss); | |
3215 | rdev->bss_generation++; | |
3216 | ||
3217 | list_for_each_entry_safe(nontrans_bss, tmp, | |
3218 | &cbss->pub.nontrans_list, | |
3219 | nontrans_list) { | |
61e41e5d | 3220 | bss = bss_from_pub(nontrans_bss); |
0afd425b SM |
3221 | bss->pub.channel = chan; |
3222 | rb_erase(&bss->rbn, &rdev->bss_tree); | |
3223 | rb_insert_bss(rdev, bss); | |
3224 | rdev->bss_generation++; | |
3225 | } | |
3226 | ||
3227 | done: | |
3228 | spin_unlock_bh(&rdev->bss_lock); | |
3229 | } | |
3230 | ||
3d23e349 | 3231 | #ifdef CONFIG_CFG80211_WEXT |
9f419f38 JB |
3232 | static struct cfg80211_registered_device * |
3233 | cfg80211_get_dev_from_ifindex(struct net *net, int ifindex) | |
3234 | { | |
5fe231e8 | 3235 | struct cfg80211_registered_device *rdev; |
9f419f38 JB |
3236 | struct net_device *dev; |
3237 | ||
5fe231e8 JB |
3238 | ASSERT_RTNL(); |
3239 | ||
9f419f38 JB |
3240 | dev = dev_get_by_index(net, ifindex); |
3241 | if (!dev) | |
5fe231e8 JB |
3242 | return ERR_PTR(-ENODEV); |
3243 | if (dev->ieee80211_ptr) | |
f26cbf40 | 3244 | rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy); |
5fe231e8 | 3245 | else |
9f419f38 JB |
3246 | rdev = ERR_PTR(-ENODEV); |
3247 | dev_put(dev); | |
9f419f38 JB |
3248 | return rdev; |
3249 | } | |
3250 | ||
2a519311 JB |
3251 | int cfg80211_wext_siwscan(struct net_device *dev, |
3252 | struct iw_request_info *info, | |
3253 | union iwreq_data *wrqu, char *extra) | |
3254 | { | |
3255 | struct cfg80211_registered_device *rdev; | |
3256 | struct wiphy *wiphy; | |
3257 | struct iw_scan_req *wreq = NULL; | |
3536672b | 3258 | struct cfg80211_scan_request *creq; |
2a519311 | 3259 | int i, err, n_channels = 0; |
57fbcce3 | 3260 | enum nl80211_band band; |
2a519311 JB |
3261 | |
3262 | if (!netif_running(dev)) | |
3263 | return -ENETDOWN; | |
3264 | ||
b2e3abdc HS |
3265 | if (wrqu->data.length == sizeof(struct iw_scan_req)) |
3266 | wreq = (struct iw_scan_req *)extra; | |
3267 | ||
463d0183 | 3268 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
3269 | |
3270 | if (IS_ERR(rdev)) | |
3271 | return PTR_ERR(rdev); | |
3272 | ||
3536672b | 3273 | if (rdev->scan_req || rdev->scan_msg) |
3274 | return -EBUSY; | |
2a519311 JB |
3275 | |
3276 | wiphy = &rdev->wiphy; | |
3277 | ||
b2e3abdc HS |
3278 | /* Determine number of channels, needed to allocate creq */ |
3279 | if (wreq && wreq->num_channels) | |
3280 | n_channels = wreq->num_channels; | |
bdfbec2d IP |
3281 | else |
3282 | n_channels = ieee80211_get_num_supported_channels(wiphy); | |
2a519311 JB |
3283 | |
3284 | creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + | |
3285 | n_channels * sizeof(void *), | |
3286 | GFP_ATOMIC); | |
3536672b | 3287 | if (!creq) |
3288 | return -ENOMEM; | |
2a519311 JB |
3289 | |
3290 | creq->wiphy = wiphy; | |
fd014284 | 3291 | creq->wdev = dev->ieee80211_ptr; |
5ba63533 JB |
3292 | /* SSIDs come after channels */ |
3293 | creq->ssids = (void *)&creq->channels[n_channels]; | |
2a519311 JB |
3294 | creq->n_channels = n_channels; |
3295 | creq->n_ssids = 1; | |
15d6030b | 3296 | creq->scan_start = jiffies; |
2a519311 | 3297 | |
b2e3abdc | 3298 | /* translate "Scan on frequencies" request */ |
2a519311 | 3299 | i = 0; |
57fbcce3 | 3300 | for (band = 0; band < NUM_NL80211_BANDS; band++) { |
2a519311 | 3301 | int j; |
584991dc | 3302 | |
2a519311 JB |
3303 | if (!wiphy->bands[band]) |
3304 | continue; | |
584991dc | 3305 | |
2a519311 | 3306 | for (j = 0; j < wiphy->bands[band]->n_channels; j++) { |
584991dc JB |
3307 | /* ignore disabled channels */ |
3308 | if (wiphy->bands[band]->channels[j].flags & | |
3309 | IEEE80211_CHAN_DISABLED) | |
3310 | continue; | |
b2e3abdc HS |
3311 | |
3312 | /* If we have a wireless request structure and the | |
3313 | * wireless request specifies frequencies, then search | |
3314 | * for the matching hardware channel. | |
3315 | */ | |
3316 | if (wreq && wreq->num_channels) { | |
3317 | int k; | |
3318 | int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; | |
3319 | for (k = 0; k < wreq->num_channels; k++) { | |
96998e3a ZG |
3320 | struct iw_freq *freq = |
3321 | &wreq->channel_list[k]; | |
3322 | int wext_freq = | |
3323 | cfg80211_wext_freq(freq); | |
3324 | ||
b2e3abdc HS |
3325 | if (wext_freq == wiphy_freq) |
3326 | goto wext_freq_found; | |
3327 | } | |
3328 | goto wext_freq_not_found; | |
3329 | } | |
3330 | ||
3331 | wext_freq_found: | |
2a519311 JB |
3332 | creq->channels[i] = &wiphy->bands[band]->channels[j]; |
3333 | i++; | |
b2e3abdc | 3334 | wext_freq_not_found: ; |
2a519311 JB |
3335 | } |
3336 | } | |
8862dc5f HS |
3337 | /* No channels found? */ |
3338 | if (!i) { | |
3339 | err = -EINVAL; | |
3340 | goto out; | |
3341 | } | |
2a519311 | 3342 | |
b2e3abdc HS |
3343 | /* Set real number of channels specified in creq->channels[] */ |
3344 | creq->n_channels = i; | |
2a519311 | 3345 | |
b2e3abdc HS |
3346 | /* translate "Scan for SSID" request */ |
3347 | if (wreq) { | |
2a519311 | 3348 | if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { |
65486c8b JB |
3349 | if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { |
3350 | err = -EINVAL; | |
3351 | goto out; | |
3352 | } | |
2a519311 JB |
3353 | memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); |
3354 | creq->ssids[0].ssid_len = wreq->essid_len; | |
3355 | } | |
3356 | if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) | |
3357 | creq->n_ssids = 0; | |
3358 | } | |
3359 | ||
57fbcce3 | 3360 | for (i = 0; i < NUM_NL80211_BANDS; i++) |
a401d2bb JB |
3361 | if (wiphy->bands[i]) |
3362 | creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1; | |
34850ab2 | 3363 | |
818965d3 JM |
3364 | eth_broadcast_addr(creq->bssid); |
3365 | ||
a05829a7 JB |
3366 | wiphy_lock(&rdev->wiphy); |
3367 | ||
2a519311 | 3368 | rdev->scan_req = creq; |
e35e4d28 | 3369 | err = rdev_scan(rdev, creq); |
2a519311 JB |
3370 | if (err) { |
3371 | rdev->scan_req = NULL; | |
65486c8b | 3372 | /* creq will be freed below */ |
463d0183 | 3373 | } else { |
fd014284 | 3374 | nl80211_send_scan_start(rdev, dev->ieee80211_ptr); |
65486c8b JB |
3375 | /* creq now owned by driver */ |
3376 | creq = NULL; | |
463d0183 JB |
3377 | dev_hold(dev); |
3378 | } | |
a05829a7 | 3379 | wiphy_unlock(&rdev->wiphy); |
2a519311 | 3380 | out: |
65486c8b | 3381 | kfree(creq); |
2a519311 JB |
3382 | return err; |
3383 | } | |
2afe38d1 | 3384 | EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan); |
2a519311 | 3385 | |
76a70e9c JM |
3386 | static char *ieee80211_scan_add_ies(struct iw_request_info *info, |
3387 | const struct cfg80211_bss_ies *ies, | |
3388 | char *current_ev, char *end_buf) | |
2a519311 | 3389 | { |
9caf0364 | 3390 | const u8 *pos, *end, *next; |
2a519311 JB |
3391 | struct iw_event iwe; |
3392 | ||
9caf0364 | 3393 | if (!ies) |
76a70e9c | 3394 | return current_ev; |
2a519311 JB |
3395 | |
3396 | /* | |
3397 | * If needed, fragment the IEs buffer (at IE boundaries) into short | |
3398 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. | |
3399 | */ | |
9caf0364 JB |
3400 | pos = ies->data; |
3401 | end = pos + ies->len; | |
2a519311 JB |
3402 | |
3403 | while (end - pos > IW_GENERIC_IE_MAX) { | |
3404 | next = pos + 2 + pos[1]; | |
3405 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) | |
3406 | next = next + 2 + next[1]; | |
3407 | ||
3408 | memset(&iwe, 0, sizeof(iwe)); | |
3409 | iwe.cmd = IWEVGENIE; | |
3410 | iwe.u.data.length = next - pos; | |
76a70e9c JM |
3411 | current_ev = iwe_stream_add_point_check(info, current_ev, |
3412 | end_buf, &iwe, | |
3413 | (void *)pos); | |
3414 | if (IS_ERR(current_ev)) | |
3415 | return current_ev; | |
2a519311 JB |
3416 | pos = next; |
3417 | } | |
3418 | ||
3419 | if (end > pos) { | |
3420 | memset(&iwe, 0, sizeof(iwe)); | |
3421 | iwe.cmd = IWEVGENIE; | |
3422 | iwe.u.data.length = end - pos; | |
76a70e9c JM |
3423 | current_ev = iwe_stream_add_point_check(info, current_ev, |
3424 | end_buf, &iwe, | |
3425 | (void *)pos); | |
3426 | if (IS_ERR(current_ev)) | |
3427 | return current_ev; | |
2a519311 | 3428 | } |
76a70e9c JM |
3429 | |
3430 | return current_ev; | |
2a519311 JB |
3431 | } |
3432 | ||
2a519311 | 3433 | static char * |
77965c97 JB |
3434 | ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, |
3435 | struct cfg80211_internal_bss *bss, char *current_ev, | |
3436 | char *end_buf) | |
2a519311 | 3437 | { |
9caf0364 | 3438 | const struct cfg80211_bss_ies *ies; |
2a519311 | 3439 | struct iw_event iwe; |
9caf0364 | 3440 | const u8 *ie; |
76a70e9c JM |
3441 | u8 buf[50]; |
3442 | u8 *cfg, *p, *tmp; | |
9caf0364 | 3443 | int rem, i, sig; |
2a519311 JB |
3444 | bool ismesh = false; |
3445 | ||
3446 | memset(&iwe, 0, sizeof(iwe)); | |
3447 | iwe.cmd = SIOCGIWAP; | |
3448 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; | |
3449 | memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); | |
76a70e9c JM |
3450 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
3451 | IW_EV_ADDR_LEN); | |
3452 | if (IS_ERR(current_ev)) | |
3453 | return current_ev; | |
2a519311 JB |
3454 | |
3455 | memset(&iwe, 0, sizeof(iwe)); | |
3456 | iwe.cmd = SIOCGIWFREQ; | |
3457 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); | |
3458 | iwe.u.freq.e = 0; | |
76a70e9c JM |
3459 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
3460 | IW_EV_FREQ_LEN); | |
3461 | if (IS_ERR(current_ev)) | |
3462 | return current_ev; | |
2a519311 JB |
3463 | |
3464 | memset(&iwe, 0, sizeof(iwe)); | |
3465 | iwe.cmd = SIOCGIWFREQ; | |
3466 | iwe.u.freq.m = bss->pub.channel->center_freq; | |
3467 | iwe.u.freq.e = 6; | |
76a70e9c JM |
3468 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
3469 | IW_EV_FREQ_LEN); | |
3470 | if (IS_ERR(current_ev)) | |
3471 | return current_ev; | |
2a519311 | 3472 | |
77965c97 | 3473 | if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { |
2a519311 JB |
3474 | memset(&iwe, 0, sizeof(iwe)); |
3475 | iwe.cmd = IWEVQUAL; | |
3476 | iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | | |
3477 | IW_QUAL_NOISE_INVALID | | |
a77b8552 | 3478 | IW_QUAL_QUAL_UPDATED; |
77965c97 | 3479 | switch (wiphy->signal_type) { |
2a519311 | 3480 | case CFG80211_SIGNAL_TYPE_MBM: |
a77b8552 JB |
3481 | sig = bss->pub.signal / 100; |
3482 | iwe.u.qual.level = sig; | |
2a519311 | 3483 | iwe.u.qual.updated |= IW_QUAL_DBM; |
a77b8552 JB |
3484 | if (sig < -110) /* rather bad */ |
3485 | sig = -110; | |
3486 | else if (sig > -40) /* perfect */ | |
3487 | sig = -40; | |
3488 | /* will give a range of 0 .. 70 */ | |
3489 | iwe.u.qual.qual = sig + 110; | |
2a519311 JB |
3490 | break; |
3491 | case CFG80211_SIGNAL_TYPE_UNSPEC: | |
3492 | iwe.u.qual.level = bss->pub.signal; | |
a77b8552 JB |
3493 | /* will give range 0 .. 100 */ |
3494 | iwe.u.qual.qual = bss->pub.signal; | |
2a519311 JB |
3495 | break; |
3496 | default: | |
3497 | /* not reached */ | |
3498 | break; | |
3499 | } | |
76a70e9c JM |
3500 | current_ev = iwe_stream_add_event_check(info, current_ev, |
3501 | end_buf, &iwe, | |
3502 | IW_EV_QUAL_LEN); | |
3503 | if (IS_ERR(current_ev)) | |
3504 | return current_ev; | |
2a519311 JB |
3505 | } |
3506 | ||
3507 | memset(&iwe, 0, sizeof(iwe)); | |
3508 | iwe.cmd = SIOCGIWENCODE; | |
3509 | if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) | |
3510 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; | |
3511 | else | |
3512 | iwe.u.data.flags = IW_ENCODE_DISABLED; | |
3513 | iwe.u.data.length = 0; | |
76a70e9c JM |
3514 | current_ev = iwe_stream_add_point_check(info, current_ev, end_buf, |
3515 | &iwe, ""); | |
3516 | if (IS_ERR(current_ev)) | |
3517 | return current_ev; | |
2a519311 | 3518 | |
9caf0364 JB |
3519 | rcu_read_lock(); |
3520 | ies = rcu_dereference(bss->pub.ies); | |
83c7aa1a JB |
3521 | rem = ies->len; |
3522 | ie = ies->data; | |
9caf0364 | 3523 | |
83c7aa1a | 3524 | while (rem >= 2) { |
2a519311 JB |
3525 | /* invalid data */ |
3526 | if (ie[1] > rem - 2) | |
3527 | break; | |
3528 | ||
3529 | switch (ie[0]) { | |
3530 | case WLAN_EID_SSID: | |
3531 | memset(&iwe, 0, sizeof(iwe)); | |
3532 | iwe.cmd = SIOCGIWESSID; | |
3533 | iwe.u.data.length = ie[1]; | |
3534 | iwe.u.data.flags = 1; | |
76a70e9c JM |
3535 | current_ev = iwe_stream_add_point_check(info, |
3536 | current_ev, | |
3537 | end_buf, &iwe, | |
3538 | (u8 *)ie + 2); | |
3539 | if (IS_ERR(current_ev)) | |
3540 | goto unlock; | |
2a519311 JB |
3541 | break; |
3542 | case WLAN_EID_MESH_ID: | |
3543 | memset(&iwe, 0, sizeof(iwe)); | |
3544 | iwe.cmd = SIOCGIWESSID; | |
3545 | iwe.u.data.length = ie[1]; | |
3546 | iwe.u.data.flags = 1; | |
76a70e9c JM |
3547 | current_ev = iwe_stream_add_point_check(info, |
3548 | current_ev, | |
3549 | end_buf, &iwe, | |
3550 | (u8 *)ie + 2); | |
3551 | if (IS_ERR(current_ev)) | |
3552 | goto unlock; | |
2a519311 JB |
3553 | break; |
3554 | case WLAN_EID_MESH_CONFIG: | |
3555 | ismesh = true; | |
136cfa28 | 3556 | if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) |
2a519311 | 3557 | break; |
9caf0364 | 3558 | cfg = (u8 *)ie + 2; |
2a519311 JB |
3559 | memset(&iwe, 0, sizeof(iwe)); |
3560 | iwe.cmd = IWEVCUSTOM; | |
22446b7e DA |
3561 | iwe.u.data.length = sprintf(buf, |
3562 | "Mesh Network Path Selection Protocol ID: 0x%02X", | |
3563 | cfg[0]); | |
76a70e9c JM |
3564 | current_ev = iwe_stream_add_point_check(info, |
3565 | current_ev, | |
3566 | end_buf, | |
3567 | &iwe, buf); | |
3568 | if (IS_ERR(current_ev)) | |
3569 | goto unlock; | |
22446b7e DA |
3570 | iwe.u.data.length = sprintf(buf, |
3571 | "Path Selection Metric ID: 0x%02X", | |
3572 | cfg[1]); | |
76a70e9c JM |
3573 | current_ev = iwe_stream_add_point_check(info, |
3574 | current_ev, | |
3575 | end_buf, | |
3576 | &iwe, buf); | |
3577 | if (IS_ERR(current_ev)) | |
3578 | goto unlock; | |
22446b7e DA |
3579 | iwe.u.data.length = sprintf(buf, |
3580 | "Congestion Control Mode ID: 0x%02X", | |
3581 | cfg[2]); | |
76a70e9c JM |
3582 | current_ev = iwe_stream_add_point_check(info, |
3583 | current_ev, | |
3584 | end_buf, | |
3585 | &iwe, buf); | |
3586 | if (IS_ERR(current_ev)) | |
3587 | goto unlock; | |
22446b7e DA |
3588 | iwe.u.data.length = sprintf(buf, |
3589 | "Synchronization ID: 0x%02X", | |
3590 | cfg[3]); | |
76a70e9c JM |
3591 | current_ev = iwe_stream_add_point_check(info, |
3592 | current_ev, | |
3593 | end_buf, | |
3594 | &iwe, buf); | |
3595 | if (IS_ERR(current_ev)) | |
3596 | goto unlock; | |
22446b7e DA |
3597 | iwe.u.data.length = sprintf(buf, |
3598 | "Authentication ID: 0x%02X", | |
3599 | cfg[4]); | |
76a70e9c JM |
3600 | current_ev = iwe_stream_add_point_check(info, |
3601 | current_ev, | |
3602 | end_buf, | |
3603 | &iwe, buf); | |
3604 | if (IS_ERR(current_ev)) | |
3605 | goto unlock; | |
22446b7e DA |
3606 | iwe.u.data.length = sprintf(buf, |
3607 | "Formation Info: 0x%02X", | |
3608 | cfg[5]); | |
76a70e9c JM |
3609 | current_ev = iwe_stream_add_point_check(info, |
3610 | current_ev, | |
3611 | end_buf, | |
3612 | &iwe, buf); | |
3613 | if (IS_ERR(current_ev)) | |
3614 | goto unlock; | |
22446b7e DA |
3615 | iwe.u.data.length = sprintf(buf, |
3616 | "Capabilities: 0x%02X", | |
3617 | cfg[6]); | |
76a70e9c JM |
3618 | current_ev = iwe_stream_add_point_check(info, |
3619 | current_ev, | |
3620 | end_buf, | |
3621 | &iwe, buf); | |
3622 | if (IS_ERR(current_ev)) | |
3623 | goto unlock; | |
2a519311 JB |
3624 | break; |
3625 | case WLAN_EID_SUPP_RATES: | |
3626 | case WLAN_EID_EXT_SUPP_RATES: | |
3627 | /* display all supported rates in readable format */ | |
3628 | p = current_ev + iwe_stream_lcp_len(info); | |
3629 | ||
3630 | memset(&iwe, 0, sizeof(iwe)); | |
3631 | iwe.cmd = SIOCGIWRATE; | |
3632 | /* Those two flags are ignored... */ | |
3633 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; | |
3634 | ||
3635 | for (i = 0; i < ie[1]; i++) { | |
3636 | iwe.u.bitrate.value = | |
3637 | ((ie[i + 2] & 0x7f) * 500000); | |
76a70e9c | 3638 | tmp = p; |
2a519311 | 3639 | p = iwe_stream_add_value(info, current_ev, p, |
76a70e9c JM |
3640 | end_buf, &iwe, |
3641 | IW_EV_PARAM_LEN); | |
3642 | if (p == tmp) { | |
3643 | current_ev = ERR_PTR(-E2BIG); | |
3644 | goto unlock; | |
3645 | } | |
2a519311 JB |
3646 | } |
3647 | current_ev = p; | |
3648 | break; | |
3649 | } | |
3650 | rem -= ie[1] + 2; | |
3651 | ie += ie[1] + 2; | |
3652 | } | |
3653 | ||
f64f9e71 JP |
3654 | if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || |
3655 | ismesh) { | |
2a519311 JB |
3656 | memset(&iwe, 0, sizeof(iwe)); |
3657 | iwe.cmd = SIOCGIWMODE; | |
3658 | if (ismesh) | |
3659 | iwe.u.mode = IW_MODE_MESH; | |
3660 | else if (bss->pub.capability & WLAN_CAPABILITY_ESS) | |
3661 | iwe.u.mode = IW_MODE_MASTER; | |
3662 | else | |
3663 | iwe.u.mode = IW_MODE_ADHOC; | |
76a70e9c JM |
3664 | current_ev = iwe_stream_add_event_check(info, current_ev, |
3665 | end_buf, &iwe, | |
3666 | IW_EV_UINT_LEN); | |
3667 | if (IS_ERR(current_ev)) | |
3668 | goto unlock; | |
2a519311 JB |
3669 | } |
3670 | ||
76a70e9c JM |
3671 | memset(&iwe, 0, sizeof(iwe)); |
3672 | iwe.cmd = IWEVCUSTOM; | |
22446b7e DA |
3673 | iwe.u.data.length = sprintf(buf, "tsf=%016llx", |
3674 | (unsigned long long)(ies->tsf)); | |
76a70e9c JM |
3675 | current_ev = iwe_stream_add_point_check(info, current_ev, end_buf, |
3676 | &iwe, buf); | |
3677 | if (IS_ERR(current_ev)) | |
3678 | goto unlock; | |
3679 | memset(&iwe, 0, sizeof(iwe)); | |
3680 | iwe.cmd = IWEVCUSTOM; | |
22446b7e DA |
3681 | iwe.u.data.length = sprintf(buf, " Last beacon: %ums ago", |
3682 | elapsed_jiffies_msecs(bss->ts)); | |
76a70e9c JM |
3683 | current_ev = iwe_stream_add_point_check(info, current_ev, |
3684 | end_buf, &iwe, buf); | |
3685 | if (IS_ERR(current_ev)) | |
3686 | goto unlock; | |
3687 | ||
3688 | current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf); | |
3689 | ||
3690 | unlock: | |
9caf0364 | 3691 | rcu_read_unlock(); |
2a519311 JB |
3692 | return current_ev; |
3693 | } | |
3694 | ||
3695 | ||
1b8ec87a | 3696 | static int ieee80211_scan_results(struct cfg80211_registered_device *rdev, |
2a519311 JB |
3697 | struct iw_request_info *info, |
3698 | char *buf, size_t len) | |
3699 | { | |
3700 | char *current_ev = buf; | |
3701 | char *end_buf = buf + len; | |
3702 | struct cfg80211_internal_bss *bss; | |
76a70e9c | 3703 | int err = 0; |
2a519311 | 3704 | |
1b8ec87a ZG |
3705 | spin_lock_bh(&rdev->bss_lock); |
3706 | cfg80211_bss_expire(rdev); | |
2a519311 | 3707 | |
1b8ec87a | 3708 | list_for_each_entry(bss, &rdev->bss_list, list) { |
2a519311 | 3709 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { |
76a70e9c JM |
3710 | err = -E2BIG; |
3711 | break; | |
2a519311 | 3712 | } |
1b8ec87a | 3713 | current_ev = ieee80211_bss(&rdev->wiphy, info, bss, |
77965c97 | 3714 | current_ev, end_buf); |
76a70e9c JM |
3715 | if (IS_ERR(current_ev)) { |
3716 | err = PTR_ERR(current_ev); | |
3717 | break; | |
3718 | } | |
2a519311 | 3719 | } |
1b8ec87a | 3720 | spin_unlock_bh(&rdev->bss_lock); |
76a70e9c JM |
3721 | |
3722 | if (err) | |
3723 | return err; | |
2a519311 JB |
3724 | return current_ev - buf; |
3725 | } | |
3726 | ||
3727 | ||
3728 | int cfg80211_wext_giwscan(struct net_device *dev, | |
3729 | struct iw_request_info *info, | |
02ae6a70 | 3730 | union iwreq_data *wrqu, char *extra) |
2a519311 | 3731 | { |
02ae6a70 | 3732 | struct iw_point *data = &wrqu->data; |
2a519311 JB |
3733 | struct cfg80211_registered_device *rdev; |
3734 | int res; | |
3735 | ||
3736 | if (!netif_running(dev)) | |
3737 | return -ENETDOWN; | |
3738 | ||
463d0183 | 3739 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
3740 | |
3741 | if (IS_ERR(rdev)) | |
3742 | return PTR_ERR(rdev); | |
3743 | ||
f9d15d16 | 3744 | if (rdev->scan_req || rdev->scan_msg) |
5fe231e8 | 3745 | return -EAGAIN; |
2a519311 JB |
3746 | |
3747 | res = ieee80211_scan_results(rdev, info, extra, data->length); | |
3748 | data->length = 0; | |
3749 | if (res >= 0) { | |
3750 | data->length = res; | |
3751 | res = 0; | |
3752 | } | |
3753 | ||
2a519311 JB |
3754 | return res; |
3755 | } | |
2afe38d1 | 3756 | EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan); |
2a519311 | 3757 | #endif |