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net: Remove redundant if statements
[linux-2.6-block.git] / net / wireless / scan.c
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b2441318 1// SPDX-License-Identifier: GPL-2.0
2a519311
JB		 2/*
3 * cfg80211 scan result handling
4 *
5 * Copyright 2008 Johannes Berg <johannes@sipsolutions.net>
2740f0cf 6 * Copyright 2013-2014 Intel Mobile Communications GmbH
1d76250b 7 * Copyright 2016 Intel Deutschland GmbH
52bb2052 8 * Copyright (C) 2018-2021 Intel Corporation
2a519311
JB		 9 */
10#include <linux/kernel.h>
5a0e3ad6 11#include <linux/slab.h>
2a519311
JB		 12#include <linux/module.h>
13#include <linux/netdevice.h>
14#include <linux/wireless.h>
15#include <linux/nl80211.h>
16#include <linux/etherdevice.h>
c8cb5b85
TM		 17#include <linux/crc32.h>
18#include <linux/bitfield.h>
2a519311
JB		 19#include <net/arp.h>
20#include <net/cfg80211.h>
262eb9b2 21#include <net/cfg80211-wext.h>
2a519311
JB		 22#include <net/iw_handler.h>
23#include "core.h"
24#include "nl80211.h"
a9a11622 25#include "wext-compat.h"
e35e4d28 26#include "rdev-ops.h"
2a519311 27
776b3580
JB		 28/**
29 * DOC: BSS tree/list structure
30 *
31 * At the top level, the BSS list is kept in both a list in each
32 * registered device (@bss_list) as well as an RB-tree for faster
33 * lookup. In the RB-tree, entries can be looked up using their
34 * channel, MESHID, MESHCONF (for MBSSes) or channel, BSSID, SSID
35 * for other BSSes.
36 *
37 * Due to the possibility of hidden SSIDs, there's a second level
38 * structure, the "hidden_list" and "hidden_beacon_bss" pointer.
39 * The hidden_list connects all BSSes belonging to a single AP
40 * that has a hidden SSID, and connects beacon and probe response
41 * entries. For a probe response entry for a hidden SSID, the
42 * hidden_beacon_bss pointer points to the BSS struct holding the
43 * beacon's information.
44 *
45 * Reference counting is done for all these references except for
46 * the hidden_list, so that a beacon BSS struct that is otherwise
47 * not referenced has one reference for being on the bss_list and
48 * one for each probe response entry that points to it using the
49 * hidden_beacon_bss pointer. When a BSS struct that has such a
50 * pointer is get/put, the refcount update is also propagated to
51 * the referenced struct, this ensure that it cannot get removed
52 * while somebody is using the probe response version.
53 *
54 * Note that the hidden_beacon_bss pointer never changes, due to
55 * the reference counting. Therefore, no locking is needed for
56 * it.
57 *
58 * Also note that the hidden_beacon_bss pointer is only relevant
59 * if the driver uses something other than the IEs, e.g. private
8cf5c86d 60 * data stored in the BSS struct, since the beacon IEs are
776b3580
JB		 61 * also linked into the probe response struct.
62 */
63
9853a55e
JB		 64/*
65 * Limit the number of BSS entries stored in mac80211. Each one is
66 * a bit over 4k at most, so this limits to roughly 4-5M of memory.
67 * If somebody wants to really attack this though, they'd likely
68 * use small beacons, and only one type of frame, limiting each of
69 * the entries to a much smaller size (in order to generate more
70 * entries in total, so overhead is bigger.)
71 */
72static int bss_entries_limit = 1000;
73module_param(bss_entries_limit, int, 0644);
74MODULE_PARM_DESC(bss_entries_limit,
75 "limit to number of scan BSS entries (per wiphy, default 1000)");
76
f9616e0f 77#define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ)
2a519311 78
c8cb5b85
TM		 79/**
80 * struct cfg80211_colocated_ap - colocated AP information
81 *
82 * @list: linked list to all colocated aPS
83 * @bssid: BSSID of the reported AP
84 * @ssid: SSID of the reported AP
85 * @ssid_len: length of the ssid
86 * @center_freq: frequency the reported AP is on
87 * @unsolicited_probe: the reported AP is part of an ESS, where all the APs
88 * that operate in the same channel as the reported AP and that might be
89 * detected by a STA receiving this frame, are transmitting unsolicited
90 * Probe Response frames every 20 TUs
91 * @oct_recommended: OCT is recommended to exchange MMPDUs with the reported AP
92 * @same_ssid: the reported AP has the same SSID as the reporting AP
93 * @multi_bss: the reported AP is part of a multiple BSSID set
94 * @transmitted_bssid: the reported AP is the transmitting BSSID
95 * @colocated_ess: all the APs that share the same ESS as the reported AP are
96 * colocated and can be discovered via legacy bands.
97 * @short_ssid_valid: short_ssid is valid and can be used
98 * @short_ssid: the short SSID for this SSID
99 */
100struct cfg80211_colocated_ap {
101 struct list_head list;
102 u8 bssid[ETH_ALEN];
103 u8 ssid[IEEE80211_MAX_SSID_LEN];
104 size_t ssid_len;
105 u32 short_ssid;
106 u32 center_freq;
107 u8 unsolicited_probe:1,
108 oct_recommended:1,
109 same_ssid:1,
110 multi_bss:1,
111 transmitted_bssid:1,
112 colocated_ess:1,
113 short_ssid_valid:1;
114};
115
776b3580 116static void bss_free(struct cfg80211_internal_bss *bss)
e8e27c66 117{
9caf0364 118 struct cfg80211_bss_ies *ies;
b629ea3d
JB		 119
120 if (WARN_ON(atomic_read(&bss->hold)))
121 return;
122
9caf0364 123 ies = (void *)rcu_access_pointer(bss->pub.beacon_ies);
776b3580 124 if (ies && !bss->pub.hidden_beacon_bss)
9caf0364
JB		 125 kfree_rcu(ies, rcu_head);
126 ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies);
127 if (ies)
128 kfree_rcu(ies, rcu_head);
e8e27c66 129
776b3580
JB		 130 /*
131 * This happens when the module is removed, it doesn't
132 * really matter any more save for completeness
133 */
134 if (!list_empty(&bss->hidden_list))
135 list_del(&bss->hidden_list);
136
e8e27c66
AK		 137 kfree(bss);
138}
139
1b8ec87a 140static inline void bss_ref_get(struct cfg80211_registered_device *rdev,
776b3580 141 struct cfg80211_internal_bss *bss)
0532d4f1 142{
1b8ec87a 143 lockdep_assert_held(&rdev->bss_lock);
776b3580
JB		 144
145 bss->refcount++;
146 if (bss->pub.hidden_beacon_bss) {
147 bss = container_of(bss->pub.hidden_beacon_bss,
148 struct cfg80211_internal_bss,
149 pub);
150 bss->refcount++;
151 }
7011ba58
SS		 152 if (bss->pub.transmitted_bss) {
153 bss = container_of(bss->pub.transmitted_bss,
a3584f56
SS		 154 struct cfg80211_internal_bss,
155 pub);
156 bss->refcount++;
157 }
0532d4f1
JB		 158}
159
1b8ec87a 160static inline void bss_ref_put(struct cfg80211_registered_device *rdev,
776b3580 161 struct cfg80211_internal_bss *bss)
0532d4f1 162{
1b8ec87a 163 lockdep_assert_held(&rdev->bss_lock);
776b3580
JB		 164
165 if (bss->pub.hidden_beacon_bss) {
166 struct cfg80211_internal_bss *hbss;
167 hbss = container_of(bss->pub.hidden_beacon_bss,
168 struct cfg80211_internal_bss,
169 pub);
170 hbss->refcount--;
171 if (hbss->refcount == 0)
172 bss_free(hbss);
173 }
a3584f56 174
7011ba58 175 if (bss->pub.transmitted_bss) {
a3584f56
SS		 176 struct cfg80211_internal_bss *tbss;
177
7011ba58 178 tbss = container_of(bss->pub.transmitted_bss,
a3584f56
SS		 179 struct cfg80211_internal_bss,
180 pub);
181 tbss->refcount--;
182 if (tbss->refcount == 0)
183 bss_free(tbss);
184 }
185
776b3580
JB		 186 bss->refcount--;
187 if (bss->refcount == 0)
188 bss_free(bss);
0532d4f1
JB		 189}
190
1b8ec87a 191static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev,
e8e27c66
AK		 192 struct cfg80211_internal_bss *bss)
193{
1b8ec87a 194 lockdep_assert_held(&rdev->bss_lock);
4b1af479 195
776b3580
JB		 196 if (!list_empty(&bss->hidden_list)) {
197 /*
198 * don't remove the beacon entry if it has
199 * probe responses associated with it
200 */
201 if (!bss->pub.hidden_beacon_bss)
202 return false;
203 /*
204 * if it's a probe response entry break its
205 * link to the other entries in the group
206 */
207 list_del_init(&bss->hidden_list);
208 }
209
e8e27c66 210 list_del_init(&bss->list);
7011ba58 211 list_del_init(&bss->pub.nontrans_list);
1b8ec87a 212 rb_erase(&bss->rbn, &rdev->bss_tree);
9853a55e
JB		 213 rdev->bss_entries--;
214 WARN_ONCE((rdev->bss_entries == 0) ^ list_empty(&rdev->bss_list),
215 "rdev bss entries[%d]/list[empty:%d] corruption\n",
216 rdev->bss_entries, list_empty(&rdev->bss_list));
1b8ec87a 217 bss_ref_put(rdev, bss);
776b3580 218 return true;
e8e27c66
AK		 219}
220
f7dacfb1
SS		 221bool cfg80211_is_element_inherited(const struct element *elem,
222 const struct element *non_inherit_elem)
223{
224 u8 id_len, ext_id_len, i, loop_len, id;
225 const u8 *list;
226
227 if (elem->id == WLAN_EID_MULTIPLE_BSSID)
228 return false;
229
230 if (!non_inherit_elem || non_inherit_elem->datalen < 2)
231 return true;
232
233 /*
234 * non inheritance element format is:
235 * ext ID (56) | IDs list len | list | extension IDs list len | list
236 * Both lists are optional. Both lengths are mandatory.
237 * This means valid length is:
238 * elem_len = 1 (extension ID) + 2 (list len fields) + list lengths
239 */
240 id_len = non_inherit_elem->data[1];
241 if (non_inherit_elem->datalen < 3 + id_len)
242 return true;
243
244 ext_id_len = non_inherit_elem->data[2 + id_len];
245 if (non_inherit_elem->datalen < 3 + id_len + ext_id_len)
246 return true;
247
248 if (elem->id == WLAN_EID_EXTENSION) {
249 if (!ext_id_len)
250 return true;
251 loop_len = ext_id_len;
252 list = &non_inherit_elem->data[3 + id_len];
253 id = elem->data[0];
254 } else {
255 if (!id_len)
256 return true;
257 loop_len = id_len;
258 list = &non_inherit_elem->data[2];
259 id = elem->id;
260 }
261
262 for (i = 0; i < loop_len; i++) {
263 if (list[i] == id)
264 return false;
265 }
266
267 return true;
268}
269EXPORT_SYMBOL(cfg80211_is_element_inherited);
270
0b8fb823
PX		 271static size_t cfg80211_gen_new_ie(const u8 *ie, size_t ielen,
272 const u8 *subelement, size_t subie_len,
273 u8 *new_ie, gfp_t gfp)
274{
275 u8 *pos, *tmp;
276 const u8 *tmp_old, *tmp_new;
f7dacfb1 277 const struct element *non_inherit_elem;
0b8fb823
PX		 278 u8 *sub_copy;
279
280 /* copy subelement as we need to change its content to
281 * mark an ie after it is processed.
282 */
90abf96a 283 sub_copy = kmemdup(subelement, subie_len, gfp);
0b8fb823
PX		 284 if (!sub_copy)
285 return 0;
0b8fb823
PX		 286
287 pos = &new_ie[0];
288
289 /* set new ssid */
290 tmp_new = cfg80211_find_ie(WLAN_EID_SSID, sub_copy, subie_len);
291 if (tmp_new) {
292 memcpy(pos, tmp_new, tmp_new[1] + 2);
293 pos += (tmp_new[1] + 2);
294 }
295
f7dacfb1
SS		 296 /* get non inheritance list if exists */
297 non_inherit_elem =
298 cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE,
299 sub_copy, subie_len);
300
0b8fb823
PX		 301 /* go through IEs in ie (skip SSID) and subelement,
302 * merge them into new_ie
303 */
304 tmp_old = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen);
305 tmp_old = (tmp_old) ? tmp_old + tmp_old[1] + 2 : ie;
306
307 while (tmp_old + tmp_old[1] + 2 - ie <= ielen) {
308 if (tmp_old[0] == 0) {
309 tmp_old++;
310 continue;
311 }
312
c17fe043
SS		 313 if (tmp_old[0] == WLAN_EID_EXTENSION)
314 tmp = (u8 *)cfg80211_find_ext_ie(tmp_old[2], sub_copy,
315 subie_len);
316 else
317 tmp = (u8 *)cfg80211_find_ie(tmp_old[0], sub_copy,
318 subie_len);
319
0b8fb823 320 if (!tmp) {
f7dacfb1
SS		 321 const struct element *old_elem = (void *)tmp_old;
322
0b8fb823 323 /* ie in old ie but not in subelement */
f7dacfb1
SS		 324 if (cfg80211_is_element_inherited(old_elem,
325 non_inherit_elem)) {
0b8fb823
PX		 326 memcpy(pos, tmp_old, tmp_old[1] + 2);
327 pos += tmp_old[1] + 2;
328 }
329 } else {
330 /* ie in transmitting ie also in subelement,
331 * copy from subelement and flag the ie in subelement
c17fe043
SS		 332 * as copied (by setting eid field to WLAN_EID_SSID,
333 * which is skipped anyway).
334 * For vendor ie, compare OUI + type + subType to
0b8fb823
PX		 335 * determine if they are the same ie.
336 */
337 if (tmp_old[0] == WLAN_EID_VENDOR_SPECIFIC) {
338 if (!memcmp(tmp_old + 2, tmp + 2, 5)) {
339 /* same vendor ie, copy from
340 * subelement
341 */
342 memcpy(pos, tmp, tmp[1] + 2);
343 pos += tmp[1] + 2;
c17fe043 344 tmp[0] = WLAN_EID_SSID;
0b8fb823
PX		 345 } else {
346 memcpy(pos, tmp_old, tmp_old[1] + 2);
347 pos += tmp_old[1] + 2;
348 }
349 } else {
350 /* copy ie from subelement into new ie */
351 memcpy(pos, tmp, tmp[1] + 2);
352 pos += tmp[1] + 2;
c17fe043 353 tmp[0] = WLAN_EID_SSID;
0b8fb823
PX		 354 }
355 }
356
357 if (tmp_old + tmp_old[1] + 2 - ie == ielen)
358 break;
359
360 tmp_old += tmp_old[1] + 2;
361 }
362
363 /* go through subelement again to check if there is any ie not
364 * copied to new ie, skip ssid, capability, bssid-index ie
365 */
366 tmp_new = sub_copy;
367 while (tmp_new + tmp_new[1] + 2 - sub_copy <= subie_len) {
368 if (!(tmp_new[0] == WLAN_EID_NON_TX_BSSID_CAP ||
5bd9d108 369 tmp_new[0] == WLAN_EID_SSID)) {
0b8fb823
PX		 370 memcpy(pos, tmp_new, tmp_new[1] + 2);
371 pos += tmp_new[1] + 2;
372 }
373 if (tmp_new + tmp_new[1] + 2 - sub_copy == subie_len)
374 break;
375 tmp_new += tmp_new[1] + 2;
376 }
377
378 kfree(sub_copy);
379 return pos - new_ie;
380}
381
382static bool is_bss(struct cfg80211_bss *a, const u8 *bssid,
383 const u8 *ssid, size_t ssid_len)
384{
385 const struct cfg80211_bss_ies *ies;
386 const u8 *ssidie;
387
388 if (bssid && !ether_addr_equal(a->bssid, bssid))
389 return false;
390
391 if (!ssid)
392 return true;
393
394 ies = rcu_access_pointer(a->ies);
395 if (!ies)
396 return false;
397 ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
398 if (!ssidie)
399 return false;
400 if (ssidie[1] != ssid_len)
401 return false;
402 return memcmp(ssidie + 2, ssid, ssid_len) == 0;
403}
404
405static int
7011ba58
SS		 406cfg80211_add_nontrans_list(struct cfg80211_bss *trans_bss,
407 struct cfg80211_bss *nontrans_bss)
0b8fb823
PX		 408{
409 const u8 *ssid;
410 size_t ssid_len;
7011ba58 411 struct cfg80211_bss *bss = NULL;
0b8fb823
PX		 412
413 rcu_read_lock();
7011ba58 414 ssid = ieee80211_bss_get_ie(nontrans_bss, WLAN_EID_SSID);
0b8fb823
PX		 415 if (!ssid) {
416 rcu_read_unlock();
417 return -EINVAL;
418 }
419 ssid_len = ssid[1];
420 ssid = ssid + 2;
421 rcu_read_unlock();
422
423 /* check if nontrans_bss is in the list */
424 list_for_each_entry(bss, &trans_bss->nontrans_list, nontrans_list) {
7011ba58 425 if (is_bss(bss, nontrans_bss->bssid, ssid, ssid_len))
0b8fb823
PX		 426 return 0;
427 }
428
429 /* add to the list */
430 list_add_tail(&nontrans_bss->nontrans_list, &trans_bss->nontrans_list);
431 return 0;
432}
433
1b8ec87a 434static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev,
15d6030b
SL		 435 unsigned long expire_time)
436{
437 struct cfg80211_internal_bss *bss, *tmp;
438 bool expired = false;
439
1b8ec87a 440 lockdep_assert_held(&rdev->bss_lock);
4b1af479 441
1b8ec87a 442 list_for_each_entry_safe(bss, tmp, &rdev->bss_list, list) {
15d6030b
SL		 443 if (atomic_read(&bss->hold))
444 continue;
445 if (!time_after(expire_time, bss->ts))
446 continue;
447
1b8ec87a 448 if (__cfg80211_unlink_bss(rdev, bss))
776b3580 449 expired = true;
15d6030b
SL		 450 }
451
452 if (expired)
1b8ec87a 453 rdev->bss_generation++;
15d6030b
SL		 454}
455
9853a55e
JB		 456static bool cfg80211_bss_expire_oldest(struct cfg80211_registered_device *rdev)
457{
458 struct cfg80211_internal_bss *bss, *oldest = NULL;
459 bool ret;
460
461 lockdep_assert_held(&rdev->bss_lock);
462
463 list_for_each_entry(bss, &rdev->bss_list, list) {
464 if (atomic_read(&bss->hold))
465 continue;
466
467 if (!list_empty(&bss->hidden_list) &&
468 !bss->pub.hidden_beacon_bss)
469 continue;
470
471 if (oldest && time_before(oldest->ts, bss->ts))
472 continue;
473 oldest = bss;
474 }
475
476 if (WARN_ON(!oldest))
477 return false;
478
479 /*
480 * The callers make sure to increase rdev->bss_generation if anything
481 * gets removed (and a new entry added), so there's no need to also do
482 * it here.
483 */
484
485 ret = __cfg80211_unlink_bss(rdev, oldest);
486 WARN_ON(!ret);
487 return ret;
488}
489
c8cb5b85
TM		 490static u8 cfg80211_parse_bss_param(u8 data,
491 struct cfg80211_colocated_ap *coloc_ap)
492{
493 coloc_ap->oct_recommended =
494 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_OCT_RECOMMENDED);
495 coloc_ap->same_ssid =
496 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_SAME_SSID);
497 coloc_ap->multi_bss =
498 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_MULTI_BSSID);
499 coloc_ap->transmitted_bssid =
500 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_TRANSMITTED_BSSID);
501 coloc_ap->unsolicited_probe =
502 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_PROBE_ACTIVE);
503 coloc_ap->colocated_ess =
504 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_COLOC_ESS);
505
506 return u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_COLOC_AP);
507}
508
509static int cfg80211_calc_short_ssid(const struct cfg80211_bss_ies *ies,
510 const struct element **elem, u32 *s_ssid)
511{
512
513 *elem = cfg80211_find_elem(WLAN_EID_SSID, ies->data, ies->len);
514 if (!*elem || (*elem)->datalen > IEEE80211_MAX_SSID_LEN)
515 return -EINVAL;
516
517 *s_ssid = ~crc32_le(~0, (*elem)->data, (*elem)->datalen);
518 return 0;
519}
520
521static void cfg80211_free_coloc_ap_list(struct list_head *coloc_ap_list)
522{
523 struct cfg80211_colocated_ap *ap, *tmp_ap;
524
525 list_for_each_entry_safe(ap, tmp_ap, coloc_ap_list, list) {
526 list_del(&ap->list);
527 kfree(ap);
528 }
529}
530
531static int cfg80211_parse_ap_info(struct cfg80211_colocated_ap *entry,
532 const u8 *pos, u8 length,
533 const struct element *ssid_elem,
534 int s_ssid_tmp)
535{
536 /* skip the TBTT offset */
537 pos++;
538
539 memcpy(entry->bssid, pos, ETH_ALEN);
540 pos += ETH_ALEN;
541
542 if (length == IEEE80211_TBTT_INFO_OFFSET_BSSID_SSSID_BSS_PARAM) {
543 memcpy(&entry->short_ssid, pos,
544 sizeof(entry->short_ssid));
545 entry->short_ssid_valid = true;
546 pos += 4;
547 }
548
549 /* skip non colocated APs */
550 if (!cfg80211_parse_bss_param(*pos, entry))
551 return -EINVAL;
552 pos++;
553
554 if (length == IEEE80211_TBTT_INFO_OFFSET_BSSID_BSS_PARAM) {
555 /*
556 * no information about the short ssid. Consider the entry valid
557 * for now. It would later be dropped in case there are explicit
558 * SSIDs that need to be matched
559 */
560 if (!entry->same_ssid)
561 return 0;
562 }
563
564 if (entry->same_ssid) {
565 entry->short_ssid = s_ssid_tmp;
566 entry->short_ssid_valid = true;
567
568 /*
569 * This is safe because we validate datalen in
570 * cfg80211_parse_colocated_ap(), before calling this
571 * function.
572 */
573 memcpy(&entry->ssid, &ssid_elem->data,
574 ssid_elem->datalen);
575 entry->ssid_len = ssid_elem->datalen;
576 }
577 return 0;
578}
579
580static int cfg80211_parse_colocated_ap(const struct cfg80211_bss_ies *ies,
581 struct list_head *list)
582{
583 struct ieee80211_neighbor_ap_info *ap_info;
584 const struct element *elem, *ssid_elem;
585 const u8 *pos, *end;
586 u32 s_ssid_tmp;
587 int n_coloc = 0, ret;
588 LIST_HEAD(ap_list);
589
590 elem = cfg80211_find_elem(WLAN_EID_REDUCED_NEIGHBOR_REPORT, ies->data,
591 ies->len);
8a16ffdc 592 if (!elem)
c8cb5b85
TM		 593 return 0;
594
595 pos = elem->data;
596 end = pos + elem->datalen;
597
598 ret = cfg80211_calc_short_ssid(ies, &ssid_elem, &s_ssid_tmp);
599 if (ret)
600 return ret;
601
602 /* RNR IE may contain more than one NEIGHBOR_AP_INFO */
603 while (pos + sizeof(*ap_info) <= end) {
604 enum nl80211_band band;
605 int freq;
606 u8 length, i, count;
607
608 ap_info = (void *)pos;
609 count = u8_get_bits(ap_info->tbtt_info_hdr,
610 IEEE80211_AP_INFO_TBTT_HDR_COUNT) + 1;
611 length = ap_info->tbtt_info_len;
612
613 pos += sizeof(*ap_info);
614
615 if (!ieee80211_operating_class_to_band(ap_info->op_class,
616 &band))
617 break;
618
619 freq = ieee80211_channel_to_frequency(ap_info->channel, band);
620
5b5c9f3b 621 if (end - pos < count * length)
c8cb5b85
TM		 622 break;
623
624 /*
625 * TBTT info must include bss param + BSSID +
626 * (short SSID or same_ssid bit to be set).
627 * ignore other options, and move to the
628 * next AP info
629 */
630 if (band != NL80211_BAND_6GHZ ||
631 (length != IEEE80211_TBTT_INFO_OFFSET_BSSID_BSS_PARAM &&
632 length < IEEE80211_TBTT_INFO_OFFSET_BSSID_SSSID_BSS_PARAM)) {
5b5c9f3b 633 pos += count * length;
c8cb5b85
TM		 634 continue;
635 }
636
637 for (i = 0; i < count; i++) {
638 struct cfg80211_colocated_ap *entry;
639
640 entry = kzalloc(sizeof(*entry) + IEEE80211_MAX_SSID_LEN,
641 GFP_ATOMIC);
642
643 if (!entry)
644 break;
645
646 entry->center_freq = freq;
647
648 if (!cfg80211_parse_ap_info(entry, pos, length,
649 ssid_elem, s_ssid_tmp)) {
650 n_coloc++;
651 list_add_tail(&entry->list, &ap_list);
652 } else {
653 kfree(entry);
654 }
655
5b5c9f3b 656 pos += length;
c8cb5b85
TM		 657 }
658 }
659
660 if (pos != end) {
661 cfg80211_free_coloc_ap_list(&ap_list);
662 return 0;
663 }
664
665 list_splice_tail(&ap_list, list);
666 return n_coloc;
667}
668
669static void cfg80211_scan_req_add_chan(struct cfg80211_scan_request *request,
670 struct ieee80211_channel *chan,
671 bool add_to_6ghz)
672{
673 int i;
674 u32 n_channels = request->n_channels;
675 struct cfg80211_scan_6ghz_params *params =
676 &request->scan_6ghz_params[request->n_6ghz_params];
677
678 for (i = 0; i < n_channels; i++) {
679 if (request->channels[i] == chan) {
680 if (add_to_6ghz)
681 params->channel_idx = i;
682 return;
683 }
684 }
685
686 request->channels[n_channels] = chan;
687 if (add_to_6ghz)
688 request->scan_6ghz_params[request->n_6ghz_params].channel_idx =
689 n_channels;
690
691 request->n_channels++;
692}
693
694static bool cfg80211_find_ssid_match(struct cfg80211_colocated_ap *ap,
695 struct cfg80211_scan_request *request)
696{
ba5c2523 697 int i;
c8cb5b85
TM		 698 u32 s_ssid;
699
700 for (i = 0; i < request->n_ssids; i++) {
701 /* wildcard ssid in the scan request */
702 if (!request->ssids[i].ssid_len)
703 return true;
704
705 if (ap->ssid_len &&
706 ap->ssid_len == request->ssids[i].ssid_len) {
707 if (!memcmp(request->ssids[i].ssid, ap->ssid,
708 ap->ssid_len))
709 return true;
710 } else if (ap->short_ssid_valid) {
711 s_ssid = ~crc32_le(~0, request->ssids[i].ssid,
712 request->ssids[i].ssid_len);
713
714 if (ap->short_ssid == s_ssid)
715 return true;
716 }
717 }
718
719 return false;
720}
721
722static int cfg80211_scan_6ghz(struct cfg80211_registered_device *rdev)
723{
724 u8 i;
725 struct cfg80211_colocated_ap *ap;
726 int n_channels, count = 0, err;
727 struct cfg80211_scan_request *request, *rdev_req = rdev->scan_req;
728 LIST_HEAD(coloc_ap_list);
d590a125 729 bool need_scan_psc = true;
c8cb5b85
TM		 730 const struct ieee80211_sband_iftype_data *iftd;
731
732 rdev_req->scan_6ghz = true;
733
734 if (!rdev->wiphy.bands[NL80211_BAND_6GHZ])
735 return -EOPNOTSUPP;
736
737 iftd = ieee80211_get_sband_iftype_data(rdev->wiphy.bands[NL80211_BAND_6GHZ],
738 rdev_req->wdev->iftype);
739 if (!iftd || !iftd->he_cap.has_he)
740 return -EOPNOTSUPP;
741
742 n_channels = rdev->wiphy.bands[NL80211_BAND_6GHZ]->n_channels;
743
744 if (rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ) {
745 struct cfg80211_internal_bss *intbss;
746
747 spin_lock_bh(&rdev->bss_lock);
748 list_for_each_entry(intbss, &rdev->bss_list, list) {
749 struct cfg80211_bss *res = &intbss->pub;
750 const struct cfg80211_bss_ies *ies;
751
752 ies = rcu_access_pointer(res->ies);
753 count += cfg80211_parse_colocated_ap(ies,
754 &coloc_ap_list);
755 }
756 spin_unlock_bh(&rdev->bss_lock);
757 }
758
759 request = kzalloc(struct_size(request, channels, n_channels) +
52bb2052
IP		 760 sizeof(*request->scan_6ghz_params) * count +
761 sizeof(*request->ssids) * rdev_req->n_ssids,
c8cb5b85
TM		 762 GFP_KERNEL);
763 if (!request) {
764 cfg80211_free_coloc_ap_list(&coloc_ap_list);
765 return -ENOMEM;
766 }
767
768 *request = *rdev_req;
769 request->n_channels = 0;
770 request->scan_6ghz_params =
771 (void *)&request->channels[n_channels];
772
773 /*
d590a125
AB		 774 * PSC channels should not be scanned in case of direct scan with 1 SSID
775 * and at least one of the reported co-located APs with same SSID
776 * indicating that all APs in the same ESS are co-located
c8cb5b85 777 */
d590a125 778 if (count && request->n_ssids == 1 && request->ssids[0].ssid_len) {
c8cb5b85 779 list_for_each_entry(ap, &coloc_ap_list, list) {
d590a125
AB		 780 if (ap->colocated_ess &&
781 cfg80211_find_ssid_match(ap, request)) {
782 need_scan_psc = false;
c8cb5b85
TM		 783 break;
784 }
785 }
c8cb5b85
TM		 786 }
787
788 /*
789 * add to the scan request the channels that need to be scanned
790 * regardless of the collocated APs (PSC channels or all channels
791 * in case that NL80211_SCAN_FLAG_COLOCATED_6GHZ is not set)
792 */
793 for (i = 0; i < rdev_req->n_channels; i++) {
794 if (rdev_req->channels[i]->band == NL80211_BAND_6GHZ &&
795 ((need_scan_psc &&
796 cfg80211_channel_is_psc(rdev_req->channels[i])) ||
797 !(rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ))) {
798 cfg80211_scan_req_add_chan(request,
799 rdev_req->channels[i],
800 false);
801 }
802 }
803
804 if (!(rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ))
805 goto skip;
806
807 list_for_each_entry(ap, &coloc_ap_list, list) {
808 bool found = false;
809 struct cfg80211_scan_6ghz_params *scan_6ghz_params =
810 &request->scan_6ghz_params[request->n_6ghz_params];
811 struct ieee80211_channel *chan =
812 ieee80211_get_channel(&rdev->wiphy, ap->center_freq);
813
814 if (!chan || chan->flags & IEEE80211_CHAN_DISABLED)
815 continue;
816
817 for (i = 0; i < rdev_req->n_channels; i++) {
818 if (rdev_req->channels[i] == chan)
819 found = true;
820 }
821
822 if (!found)
823 continue;
824
825 if (request->n_ssids > 0 &&
826 !cfg80211_find_ssid_match(ap, request))
827 continue;
828
829 cfg80211_scan_req_add_chan(request, chan, true);
830 memcpy(scan_6ghz_params->bssid, ap->bssid, ETH_ALEN);
831 scan_6ghz_params->short_ssid = ap->short_ssid;
832 scan_6ghz_params->short_ssid_valid = ap->short_ssid_valid;
833 scan_6ghz_params->unsolicited_probe = ap->unsolicited_probe;
834
835 /*
836 * If a PSC channel is added to the scan and 'need_scan_psc' is
837 * set to false, then all the APs that the scan logic is
838 * interested with on the channel are collocated and thus there
839 * is no need to perform the initial PSC channel listen.
840 */
841 if (cfg80211_channel_is_psc(chan) && !need_scan_psc)
842 scan_6ghz_params->psc_no_listen = true;
843
844 request->n_6ghz_params++;
845 }
846
847skip:
848 cfg80211_free_coloc_ap_list(&coloc_ap_list);
849
850 if (request->n_channels) {
851 struct cfg80211_scan_request *old = rdev->int_scan_req;
c8cb5b85
TM		 852 rdev->int_scan_req = request;
853
52bb2052
IP		 854 /*
855 * Add the ssids from the parent scan request to the new scan
856 * request, so the driver would be able to use them in its
857 * probe requests to discover hidden APs on PSC channels.
858 */
859 request->ssids = (void *)&request->channels[request->n_channels];
860 request->n_ssids = rdev_req->n_ssids;
861 memcpy(request->ssids, rdev_req->ssids, sizeof(*request->ssids) *
862 request->n_ssids);
863
c8cb5b85
TM		 864 /*
865 * If this scan follows a previous scan, save the scan start
866 * info from the first part of the scan
867 */
868 if (old)
869 rdev->int_scan_req->info = old->info;
870
871 err = rdev_scan(rdev, request);
872 if (err) {
873 rdev->int_scan_req = old;
874 kfree(request);
875 } else {
876 kfree(old);
877 }
878
879 return err;
880 }
881
882 kfree(request);
883 return -EINVAL;
884}
885
886int cfg80211_scan(struct cfg80211_registered_device *rdev)
887{
888 struct cfg80211_scan_request *request;
889 struct cfg80211_scan_request *rdev_req = rdev->scan_req;
890 u32 n_channels = 0, idx, i;
891
892 if (!(rdev->wiphy.flags & WIPHY_FLAG_SPLIT_SCAN_6GHZ))
893 return rdev_scan(rdev, rdev_req);
894
895 for (i = 0; i < rdev_req->n_channels; i++) {
896 if (rdev_req->channels[i]->band != NL80211_BAND_6GHZ)
897 n_channels++;
898 }
899
900 if (!n_channels)
901 return cfg80211_scan_6ghz(rdev);
902
903 request = kzalloc(struct_size(request, channels, n_channels),
904 GFP_KERNEL);
905 if (!request)
906 return -ENOMEM;
907
908 *request = *rdev_req;
909 request->n_channels = n_channels;
910
911 for (i = idx = 0; i < rdev_req->n_channels; i++) {
912 if (rdev_req->channels[i]->band != NL80211_BAND_6GHZ)
913 request->channels[idx++] = rdev_req->channels[i];
914 }
915
916 rdev_req->scan_6ghz = false;
917 rdev->int_scan_req = request;
918 return rdev_scan(rdev, request);
919}
920
f9d15d16
JB		 921void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev,
922 bool send_message)
2a519311 923{
c8cb5b85 924 struct cfg80211_scan_request *request, *rdev_req;
fd014284 925 struct wireless_dev *wdev;
f9d15d16 926 struct sk_buff *msg;
3d23e349 927#ifdef CONFIG_CFG80211_WEXT
2a519311
JB		 928 union iwreq_data wrqu;
929#endif
930
a05829a7 931 lockdep_assert_held(&rdev->wiphy.mtx);
01a0ac41 932
f9d15d16 933 if (rdev->scan_msg) {
505a2e88 934 nl80211_send_scan_msg(rdev, rdev->scan_msg);
f9d15d16
JB		 935 rdev->scan_msg = NULL;
936 return;
937 }
667503dd 938
c8cb5b85
TM		 939 rdev_req = rdev->scan_req;
940 if (!rdev_req)
01a0ac41
JB		 941 return;
942
c8cb5b85
TM		 943 wdev = rdev_req->wdev;
944 request = rdev->int_scan_req ? rdev->int_scan_req : rdev_req;
945
946 if (wdev_running(wdev) &&
947 (rdev->wiphy.flags & WIPHY_FLAG_SPLIT_SCAN_6GHZ) &&
948 !rdev_req->scan_6ghz && !request->info.aborted &&
949 !cfg80211_scan_6ghz(rdev))
950 return;
2a519311 951
6829c878
JB		 952 /*
953 * This must be before sending the other events!
954 * Otherwise, wpa_supplicant gets completely confused with
955 * wext events.
956 */
fd014284
JB		 957 if (wdev->netdev)
958 cfg80211_sme_scan_done(wdev->netdev);
6829c878 959
1d76250b 960 if (!request->info.aborted &&
f9d15d16
JB		 961 request->flags & NL80211_SCAN_FLAG_FLUSH) {
962 /* flush entries from previous scans */
963 spin_lock_bh(&rdev->bss_lock);
964 __cfg80211_bss_expire(rdev, request->scan_start);
965 spin_unlock_bh(&rdev->bss_lock);
15d6030b 966 }
2a519311 967
1d76250b 968 msg = nl80211_build_scan_msg(rdev, wdev, request->info.aborted);
f9d15d16 969
3d23e349 970#ifdef CONFIG_CFG80211_WEXT
1d76250b 971 if (wdev->netdev && !request->info.aborted) {
2a519311
JB		 972 memset(&wrqu, 0, sizeof(wrqu));
973
fd014284 974 wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL);
2a519311
JB		 975 }
976#endif
977
1160dfa1 978 dev_put(wdev->netdev);
2a519311 979
c8cb5b85
TM		 980 kfree(rdev->int_scan_req);
981 rdev->int_scan_req = NULL;
982
983 kfree(rdev->scan_req);
36e6fea8 984 rdev->scan_req = NULL;
f9d15d16
JB		 985
986 if (!send_message)
987 rdev->scan_msg = msg;
988 else
505a2e88 989 nl80211_send_scan_msg(rdev, msg);
2a519311 990}
667503dd 991
36e6fea8
JB		 992void __cfg80211_scan_done(struct work_struct *wk)
993{
994 struct cfg80211_registered_device *rdev;
995
996 rdev = container_of(wk, struct cfg80211_registered_device,
997 scan_done_wk);
998
a05829a7 999 wiphy_lock(&rdev->wiphy);
f9d15d16 1000 ___cfg80211_scan_done(rdev, true);
a05829a7 1001 wiphy_unlock(&rdev->wiphy);
36e6fea8
JB		 1002}
1003
1d76250b
AS		 1004void cfg80211_scan_done(struct cfg80211_scan_request *request,
1005 struct cfg80211_scan_info *info)
667503dd 1006{
c8cb5b85
TM		 1007 struct cfg80211_scan_info old_info = request->info;
1008
1d76250b 1009 trace_cfg80211_scan_done(request, info);
c8cb5b85
TM		 1010 WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req &&
1011 request != wiphy_to_rdev(request->wiphy)->int_scan_req);
667503dd 1012
1d76250b 1013 request->info = *info;
c8cb5b85
TM		 1014
1015 /*
1016 * In case the scan is split, the scan_start_tsf and tsf_bssid should
1017 * be of the first part. In such a case old_info.scan_start_tsf should
1018 * be non zero.
1019 */
1020 if (request->scan_6ghz && old_info.scan_start_tsf) {
1021 request->info.scan_start_tsf = old_info.scan_start_tsf;
1022 memcpy(request->info.tsf_bssid, old_info.tsf_bssid,
1023 sizeof(request->info.tsf_bssid));
1024 }
1025
5fe231e8 1026 request->notified = true;
f26cbf40 1027 queue_work(cfg80211_wq, &wiphy_to_rdev(request->wiphy)->scan_done_wk);
667503dd 1028}
2a519311
JB		 1029EXPORT_SYMBOL(cfg80211_scan_done);
1030
ca986ad9
AVS		 1031void cfg80211_add_sched_scan_req(struct cfg80211_registered_device *rdev,
1032 struct cfg80211_sched_scan_request *req)
1033{
a05829a7 1034 lockdep_assert_held(&rdev->wiphy.mtx);
ca986ad9
AVS		 1035
1036 list_add_rcu(&req->list, &rdev->sched_scan_req_list);
1037}
1038
1039static void cfg80211_del_sched_scan_req(struct cfg80211_registered_device *rdev,
1040 struct cfg80211_sched_scan_request *req)
1041{
a05829a7 1042 lockdep_assert_held(&rdev->wiphy.mtx);
ca986ad9
AVS		 1043
1044 list_del_rcu(&req->list);
1045 kfree_rcu(req, rcu_head);
1046}
1047
1048static struct cfg80211_sched_scan_request *
1049cfg80211_find_sched_scan_req(struct cfg80211_registered_device *rdev, u64 reqid)
1050{
1051 struct cfg80211_sched_scan_request *pos;
1052
3ee9306b 1053 list_for_each_entry_rcu(pos, &rdev->sched_scan_req_list, list,
a05829a7 1054 lockdep_is_held(&rdev->wiphy.mtx)) {
ca986ad9
AVS		 1055 if (pos->reqid == reqid)
1056 return pos;
1057 }
b34939b9 1058 return NULL;
ca986ad9
AVS		 1059}
1060
1061/*
1062 * Determines if a scheduled scan request can be handled. When a legacy
1063 * scheduled scan is running no other scheduled scan is allowed regardless
1064 * whether the request is for legacy or multi-support scan. When a multi-support
1065 * scheduled scan is running a request for legacy scan is not allowed. In this
1066 * case a request for multi-support scan can be handled if resources are
1067 * available, ie. struct wiphy::max_sched_scan_reqs limit is not yet reached.
1068 */
1069int cfg80211_sched_scan_req_possible(struct cfg80211_registered_device *rdev,
1070 bool want_multi)
1071{
1072 struct cfg80211_sched_scan_request *pos;
1073 int i = 0;
1074
1075 list_for_each_entry(pos, &rdev->sched_scan_req_list, list) {
1076 /* request id zero means legacy in progress */
1077 if (!i && !pos->reqid)
1078 return -EINPROGRESS;
1079 i++;
1080 }
1081
1082 if (i) {
1083 /* no legacy allowed when multi request(s) are active */
1084 if (!want_multi)
1085 return -EINPROGRESS;
1086
1087 /* resource limit reached */
1088 if (i == rdev->wiphy.max_sched_scan_reqs)
1089 return -ENOSPC;
1090 }
1091 return 0;
1092}
1093
b34939b9 1094void cfg80211_sched_scan_results_wk(struct work_struct *work)
807f8a8c
LC		 1095{
1096 struct cfg80211_registered_device *rdev;
b34939b9 1097 struct cfg80211_sched_scan_request *req, *tmp;
807f8a8c 1098
b34939b9
AVS		 1099 rdev = container_of(work, struct cfg80211_registered_device,
1100 sched_scan_res_wk);
807f8a8c 1101
a05829a7 1102 wiphy_lock(&rdev->wiphy);
b34939b9
AVS		 1103 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
1104 if (req->report_results) {
1105 req->report_results = false;
1106 if (req->flags & NL80211_SCAN_FLAG_FLUSH) {
1107 /* flush entries from previous scans */
1108 spin_lock_bh(&rdev->bss_lock);
1109 __cfg80211_bss_expire(rdev, req->scan_start);
1110 spin_unlock_bh(&rdev->bss_lock);
1111 req->scan_start = jiffies;
1112 }
1113 nl80211_send_sched_scan(req,
1114 NL80211_CMD_SCHED_SCAN_RESULTS);
15d6030b 1115 }
15d6030b 1116 }
a05829a7 1117 wiphy_unlock(&rdev->wiphy);
807f8a8c
LC		 1118}
1119
b34939b9 1120void cfg80211_sched_scan_results(struct wiphy *wiphy, u64 reqid)
807f8a8c 1121{
ca986ad9
AVS		 1122 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1123 struct cfg80211_sched_scan_request *request;
1124
b34939b9 1125 trace_cfg80211_sched_scan_results(wiphy, reqid);
807f8a8c 1126 /* ignore if we're not scanning */
31a60ed1 1127
1b57b621 1128 rcu_read_lock();
b34939b9
AVS		 1129 request = cfg80211_find_sched_scan_req(rdev, reqid);
1130 if (request) {
1131 request->report_results = true;
1132 queue_work(cfg80211_wq, &rdev->sched_scan_res_wk);
1133 }
1b57b621 1134 rcu_read_unlock();
807f8a8c
LC		 1135}
1136EXPORT_SYMBOL(cfg80211_sched_scan_results);
1137
a05829a7 1138void cfg80211_sched_scan_stopped_locked(struct wiphy *wiphy, u64 reqid)
807f8a8c 1139{
f26cbf40 1140 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
807f8a8c 1141
a05829a7 1142 lockdep_assert_held(&wiphy->mtx);
792e6aa7 1143
b34939b9 1144 trace_cfg80211_sched_scan_stopped(wiphy, reqid);
4ee3e063 1145
b34939b9 1146 __cfg80211_stop_sched_scan(rdev, reqid, true);
792e6aa7 1147}
a05829a7 1148EXPORT_SYMBOL(cfg80211_sched_scan_stopped_locked);
792e6aa7 1149
b34939b9 1150void cfg80211_sched_scan_stopped(struct wiphy *wiphy, u64 reqid)
792e6aa7 1151{
a05829a7
JB		 1152 wiphy_lock(wiphy);
1153 cfg80211_sched_scan_stopped_locked(wiphy, reqid);
1154 wiphy_unlock(wiphy);
807f8a8c 1155}
807f8a8c
LC		 1156EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
1157
ca986ad9
AVS		 1158int cfg80211_stop_sched_scan_req(struct cfg80211_registered_device *rdev,
1159 struct cfg80211_sched_scan_request *req,
1160 bool driver_initiated)
807f8a8c 1161{
a05829a7 1162 lockdep_assert_held(&rdev->wiphy.mtx);
807f8a8c 1163
85a9994a 1164 if (!driver_initiated) {
3a3ecf1d 1165 int err = rdev_sched_scan_stop(rdev, req->dev, req->reqid);
85a9994a
LC		 1166 if (err)
1167 return err;
1168 }
807f8a8c 1169
ca986ad9 1170 nl80211_send_sched_scan(req, NL80211_CMD_SCHED_SCAN_STOPPED);
807f8a8c 1171
ca986ad9 1172 cfg80211_del_sched_scan_req(rdev, req);
807f8a8c 1173
3b4670ff 1174 return 0;
807f8a8c
LC		 1175}
1176
ca986ad9
AVS		 1177int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
1178 u64 reqid, bool driver_initiated)
1179{
1180 struct cfg80211_sched_scan_request *sched_scan_req;
1181
a05829a7 1182 lockdep_assert_held(&rdev->wiphy.mtx);
ca986ad9
AVS		 1183
1184 sched_scan_req = cfg80211_find_sched_scan_req(rdev, reqid);
b34939b9
AVS		 1185 if (!sched_scan_req)
1186 return -ENOENT;
ca986ad9
AVS		 1187
1188 return cfg80211_stop_sched_scan_req(rdev, sched_scan_req,
1189 driver_initiated);
1190}
1191
1b8ec87a 1192void cfg80211_bss_age(struct cfg80211_registered_device *rdev,
cb3a8eec
DW		 1193 unsigned long age_secs)
1194{
1195 struct cfg80211_internal_bss *bss;
1196 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
1197
1b8ec87a
ZG		 1198 spin_lock_bh(&rdev->bss_lock);
1199 list_for_each_entry(bss, &rdev->bss_list, list)
cb3a8eec 1200 bss->ts -= age_jiffies;
1b8ec87a 1201 spin_unlock_bh(&rdev->bss_lock);
cb3a8eec
DW		 1202}
1203
1b8ec87a 1204void cfg80211_bss_expire(struct cfg80211_registered_device *rdev)
2a519311 1205{
1b8ec87a 1206 __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE);
2a519311
JB		 1207}
1208
2f1805ea
EG		 1209void cfg80211_bss_flush(struct wiphy *wiphy)
1210{
1211 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1212
1213 spin_lock_bh(&rdev->bss_lock);
1214 __cfg80211_bss_expire(rdev, jiffies);
1215 spin_unlock_bh(&rdev->bss_lock);
1216}
1217EXPORT_SYMBOL(cfg80211_bss_flush);
1218
49a68e0d
JB		 1219const struct element *
1220cfg80211_find_elem_match(u8 eid, const u8 *ies, unsigned int len,
1221 const u8 *match, unsigned int match_len,
1222 unsigned int match_offset)
2a519311 1223{
0f3b07f0
JB		 1224 const struct element *elem;
1225
0f3b07f0 1226 for_each_element_id(elem, eid, ies, len) {
49a68e0d
JB		 1227 if (elem->datalen >= match_offset + match_len &&
1228 !memcmp(elem->data + match_offset, match, match_len))
1229 return elem;
2a519311 1230 }
fbd05e4a
LC		 1231
1232 return NULL;
2a519311 1233}
49a68e0d 1234EXPORT_SYMBOL(cfg80211_find_elem_match);
2a519311 1235
49a68e0d
JB		 1236const struct element *cfg80211_find_vendor_elem(unsigned int oui, int oui_type,
1237 const u8 *ies,
1238 unsigned int len)
0c28ec58 1239{
49a68e0d 1240 const struct element *elem;
fbd05e4a
LC		 1241 u8 match[] = { oui >> 16, oui >> 8, oui, oui_type };
1242 int match_len = (oui_type < 0) ? 3 : sizeof(match);
0c28ec58 1243
9e9ea439
EG		 1244 if (WARN_ON(oui_type > 0xff))
1245 return NULL;
1246
49a68e0d
JB		 1247 elem = cfg80211_find_elem_match(WLAN_EID_VENDOR_SPECIFIC, ies, len,
1248 match, match_len, 0);
6719429d 1249
49a68e0d 1250 if (!elem || elem->datalen < 4)
fbd05e4a 1251 return NULL;
6719429d 1252
49a68e0d 1253 return elem;
0c28ec58 1254}
49a68e0d 1255EXPORT_SYMBOL(cfg80211_find_vendor_elem);
0c28ec58 1256
4593c4cb
JB		 1257/**
1258 * enum bss_compare_mode - BSS compare mode
1259 * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find)
1260 * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode
1261 * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode
1262 */
1263enum bss_compare_mode {
1264 BSS_CMP_REGULAR,
1265 BSS_CMP_HIDE_ZLEN,
1266 BSS_CMP_HIDE_NUL,
1267};
1268
dd9dfb9f 1269static int cmp_bss(struct cfg80211_bss *a,
5622f5bb 1270 struct cfg80211_bss *b,
4593c4cb 1271 enum bss_compare_mode mode)
dd9dfb9f 1272{
9caf0364 1273 const struct cfg80211_bss_ies *a_ies, *b_ies;
3af6341c
JB		 1274 const u8 *ie1 = NULL;
1275 const u8 *ie2 = NULL;
5622f5bb 1276 int i, r;
dd9dfb9f 1277
3af6341c
JB		 1278 if (a->channel != b->channel)
1279 return b->channel->center_freq - a->channel->center_freq;
dd9dfb9f 1280
9caf0364
JB		 1281 a_ies = rcu_access_pointer(a->ies);
1282 if (!a_ies)
1283 return -1;
1284 b_ies = rcu_access_pointer(b->ies);
1285 if (!b_ies)
1286 return 1;
1287
3af6341c
JB		 1288 if (WLAN_CAPABILITY_IS_STA_BSS(a->capability))
1289 ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID,
1290 a_ies->data, a_ies->len);
1291 if (WLAN_CAPABILITY_IS_STA_BSS(b->capability))
1292 ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID,
1293 b_ies->data, b_ies->len);
1294 if (ie1 && ie2) {
1295 int mesh_id_cmp;
1296
1297 if (ie1[1] == ie2[1])
1298 mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]);
1299 else
1300 mesh_id_cmp = ie2[1] - ie1[1];
1301
1302 ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
1303 a_ies->data, a_ies->len);
1304 ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
1305 b_ies->data, b_ies->len);
1306 if (ie1 && ie2) {
1307 if (mesh_id_cmp)
1308 return mesh_id_cmp;
1309 if (ie1[1] != ie2[1])
1310 return ie2[1] - ie1[1];
1311 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
1312 }
1313 }
1314
3af6341c
JB		 1315 r = memcmp(a->bssid, b->bssid, sizeof(a->bssid));
1316 if (r)
1317 return r;
1318
9caf0364
JB		 1319 ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len);
1320 ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len);
dd9dfb9f 1321
5622f5bb
JB		 1322 if (!ie1 && !ie2)
1323 return 0;
1324
f94f8b16 1325 /*
5622f5bb
JB		 1326 * Note that with "hide_ssid", the function returns a match if
1327 * the already-present BSS ("b") is a hidden SSID beacon for
1328 * the new BSS ("a").
f94f8b16 1329 */
dd9dfb9f
DT		 1330
1331 /* sort missing IE before (left of) present IE */
1332 if (!ie1)
1333 return -1;
1334 if (!ie2)
1335 return 1;
1336
4593c4cb
JB		 1337 switch (mode) {
1338 case BSS_CMP_HIDE_ZLEN:
1339 /*
1340 * In ZLEN mode we assume the BSS entry we're
1341 * looking for has a zero-length SSID. So if
1342 * the one we're looking at right now has that,
1343 * return 0. Otherwise, return the difference
1344 * in length, but since we're looking for the
1345 * 0-length it's really equivalent to returning
1346 * the length of the one we're looking at.
1347 *
1348 * No content comparison is needed as we assume
1349 * the content length is zero.
1350 */
1351 return ie2[1];
1352 case BSS_CMP_REGULAR:
1353 default:
1354 /* sort by length first, then by contents */
1355 if (ie1[1] != ie2[1])
1356 return ie2[1] - ie1[1];
5622f5bb 1357 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
4593c4cb
JB		 1358 case BSS_CMP_HIDE_NUL:
1359 if (ie1[1] != ie2[1])
1360 return ie2[1] - ie1[1];
1361 /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */
1362 for (i = 0; i < ie2[1]; i++)
1363 if (ie2[i + 2])
1364 return -1;
1365 return 0;
1366 }
dd9dfb9f
DT		 1367}
1368
6eb18137 1369static bool cfg80211_bss_type_match(u16 capability,
57fbcce3 1370 enum nl80211_band band,
6eb18137
DL		 1371 enum ieee80211_bss_type bss_type)
1372{
1373 bool ret = true;
1374 u16 mask, val;
1375
1376 if (bss_type == IEEE80211_BSS_TYPE_ANY)
1377 return ret;
1378
57fbcce3 1379 if (band == NL80211_BAND_60GHZ) {
6eb18137
DL		 1380 mask = WLAN_CAPABILITY_DMG_TYPE_MASK;
1381 switch (bss_type) {
1382 case IEEE80211_BSS_TYPE_ESS:
1383 val = WLAN_CAPABILITY_DMG_TYPE_AP;
1384 break;
1385 case IEEE80211_BSS_TYPE_PBSS:
1386 val = WLAN_CAPABILITY_DMG_TYPE_PBSS;
1387 break;
1388 case IEEE80211_BSS_TYPE_IBSS:
1389 val = WLAN_CAPABILITY_DMG_TYPE_IBSS;
1390 break;
1391 default:
1392 return false;
1393 }
1394 } else {
1395 mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS;
1396 switch (bss_type) {
1397 case IEEE80211_BSS_TYPE_ESS:
1398 val = WLAN_CAPABILITY_ESS;
1399 break;
1400 case IEEE80211_BSS_TYPE_IBSS:
1401 val = WLAN_CAPABILITY_IBSS;
1402 break;
1403 case IEEE80211_BSS_TYPE_MBSS:
1404 val = 0;
1405 break;
1406 default:
1407 return false;
1408 }
1409 }
1410
1411 ret = ((capability & mask) == val);
1412 return ret;
1413}
1414
0e3a39b5 1415/* Returned bss is reference counted and must be cleaned up appropriately. */
2a519311
JB		 1416struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
1417 struct ieee80211_channel *channel,
1418 const u8 *bssid,
79420f09 1419 const u8 *ssid, size_t ssid_len,
6eb18137
DL		 1420 enum ieee80211_bss_type bss_type,
1421 enum ieee80211_privacy privacy)
2a519311 1422{
f26cbf40 1423 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2a519311 1424 struct cfg80211_internal_bss *bss, *res = NULL;
ccb6c136 1425 unsigned long now = jiffies;
6eb18137 1426 int bss_privacy;
2a519311 1427
6eb18137
DL		 1428 trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type,
1429 privacy);
4ee3e063 1430
1b8ec87a 1431 spin_lock_bh(&rdev->bss_lock);
2a519311 1432
1b8ec87a 1433 list_for_each_entry(bss, &rdev->bss_list, list) {
6eb18137
DL		 1434 if (!cfg80211_bss_type_match(bss->pub.capability,
1435 bss->pub.channel->band, bss_type))
1436 continue;
1437
1438 bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY);
1439 if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) ||
1440 (privacy == IEEE80211_PRIVACY_OFF && bss_privacy))
79420f09 1441 continue;
2a519311
JB		 1442 if (channel && bss->pub.channel != channel)
1443 continue;
c14a7400
JB		 1444 if (!is_valid_ether_addr(bss->pub.bssid))
1445 continue;
ccb6c136
JB		 1446 /* Don't get expired BSS structs */
1447 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
1448 !atomic_read(&bss->hold))
1449 continue;
2a519311
JB		 1450 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
1451 res = bss;
1b8ec87a 1452 bss_ref_get(rdev, res);
2a519311
JB		 1453 break;
1454 }
1455 }
1456
1b8ec87a 1457 spin_unlock_bh(&rdev->bss_lock);
2a519311
JB		 1458 if (!res)
1459 return NULL;
4ee3e063 1460 trace_cfg80211_return_bss(&res->pub);
2a519311
JB		 1461 return &res->pub;
1462}
1463EXPORT_SYMBOL(cfg80211_get_bss);
1464
1b8ec87a 1465static void rb_insert_bss(struct cfg80211_registered_device *rdev,
2a519311
JB		 1466 struct cfg80211_internal_bss *bss)
1467{
1b8ec87a 1468 struct rb_node **p = &rdev->bss_tree.rb_node;
2a519311
JB		 1469 struct rb_node *parent = NULL;
1470 struct cfg80211_internal_bss *tbss;
1471 int cmp;
1472
1473 while (*p) {
1474 parent = *p;
1475 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
1476
4593c4cb 1477 cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR);
2a519311
JB		 1478
1479 if (WARN_ON(!cmp)) {
1480 /* will sort of leak this BSS */
1481 return;
1482 }
1483
1484 if (cmp < 0)
1485 p = &(*p)->rb_left;
1486 else
1487 p = &(*p)->rb_right;
1488 }
1489
1490 rb_link_node(&bss->rbn, parent, p);
1b8ec87a 1491 rb_insert_color(&bss->rbn, &rdev->bss_tree);
2a519311
JB		 1492}
1493
1494static struct cfg80211_internal_bss *
1b8ec87a 1495rb_find_bss(struct cfg80211_registered_device *rdev,
5622f5bb 1496 struct cfg80211_internal_bss *res,
4593c4cb 1497 enum bss_compare_mode mode)
dd9dfb9f 1498{
1b8ec87a 1499 struct rb_node *n = rdev->bss_tree.rb_node;
dd9dfb9f
DT		 1500 struct cfg80211_internal_bss *bss;
1501 int r;
1502
1503 while (n) {
1504 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
4593c4cb 1505 r = cmp_bss(&res->pub, &bss->pub, mode);
dd9dfb9f
DT		 1506
1507 if (r == 0)
1508 return bss;
1509 else if (r < 0)
1510 n = n->rb_left;
1511 else
1512 n = n->rb_right;
1513 }
1514
1515 return NULL;
1516}
1517
1b8ec87a 1518static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev,
776b3580 1519 struct cfg80211_internal_bss *new)
dd9dfb9f 1520{
9caf0364 1521 const struct cfg80211_bss_ies *ies;
776b3580
JB		 1522 struct cfg80211_internal_bss *bss;
1523 const u8 *ie;
1524 int i, ssidlen;
1525 u8 fold = 0;
9853a55e 1526 u32 n_entries = 0;
9caf0364 1527
776b3580 1528 ies = rcu_access_pointer(new->pub.beacon_ies);
9caf0364 1529 if (WARN_ON(!ies))
776b3580 1530 return false;
dd9dfb9f 1531
776b3580
JB		 1532 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
1533 if (!ie) {
1534 /* nothing to do */
1535 return true;
1536 }
1537
1538 ssidlen = ie[1];
1539 for (i = 0; i < ssidlen; i++)
1540 fold |= ie[2 + i];
1541
1542 if (fold) {
1543 /* not a hidden SSID */
1544 return true;
1545 }
1546
1547 /* This is the bad part ... */
1548
1b8ec87a 1549 list_for_each_entry(bss, &rdev->bss_list, list) {
9853a55e
JB		 1550 /*
1551 * we're iterating all the entries anyway, so take the
1552 * opportunity to validate the list length accounting
1553 */
1554 n_entries++;
1555
776b3580
JB		 1556 if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid))
1557 continue;
1558 if (bss->pub.channel != new->pub.channel)
1559 continue;
dcd6eac1
SW		 1560 if (bss->pub.scan_width != new->pub.scan_width)
1561 continue;
776b3580
JB		 1562 if (rcu_access_pointer(bss->pub.beacon_ies))
1563 continue;
1564 ies = rcu_access_pointer(bss->pub.ies);
1565 if (!ies)
1566 continue;
1567 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
1568 if (!ie)
1569 continue;
1570 if (ssidlen && ie[1] != ssidlen)
1571 continue;
776b3580
JB		 1572 if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss))
1573 continue;
1574 if (WARN_ON_ONCE(!list_empty(&bss->hidden_list)))
1575 list_del(&bss->hidden_list);
1576 /* combine them */
1577 list_add(&bss->hidden_list, &new->hidden_list);
1578 bss->pub.hidden_beacon_bss = &new->pub;
1579 new->refcount += bss->refcount;
1580 rcu_assign_pointer(bss->pub.beacon_ies,
1581 new->pub.beacon_ies);
1582 }
1583
9853a55e
JB		 1584 WARN_ONCE(n_entries != rdev->bss_entries,
1585 "rdev bss entries[%d]/list[len:%d] corruption\n",
1586 rdev->bss_entries, n_entries);
1587
776b3580 1588 return true;
dd9dfb9f
DT		 1589}
1590
0cd01efb
SS		 1591struct cfg80211_non_tx_bss {
1592 struct cfg80211_bss *tx_bss;
1593 u8 max_bssid_indicator;
1594 u8 bssid_index;
1595};
1596
3ab8227d
SM		 1597static bool
1598cfg80211_update_known_bss(struct cfg80211_registered_device *rdev,
1599 struct cfg80211_internal_bss *known,
1600 struct cfg80211_internal_bss *new,
1601 bool signal_valid)
1602{
1603 lockdep_assert_held(&rdev->bss_lock);
1604
1605 /* Update IEs */
1606 if (rcu_access_pointer(new->pub.proberesp_ies)) {
1607 const struct cfg80211_bss_ies *old;
1608
1609 old = rcu_access_pointer(known->pub.proberesp_ies);
1610
1611 rcu_assign_pointer(known->pub.proberesp_ies,
1612 new->pub.proberesp_ies);
1613 /* Override possible earlier Beacon frame IEs */
1614 rcu_assign_pointer(known->pub.ies,
1615 new->pub.proberesp_ies);
1616 if (old)
1617 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1618 } else if (rcu_access_pointer(new->pub.beacon_ies)) {
1619 const struct cfg80211_bss_ies *old;
1620 struct cfg80211_internal_bss *bss;
1621
1622 if (known->pub.hidden_beacon_bss &&
1623 !list_empty(&known->hidden_list)) {
1624 const struct cfg80211_bss_ies *f;
1625
1626 /* The known BSS struct is one of the probe
1627 * response members of a group, but we're
1628 * receiving a beacon (beacon_ies in the new
1629 * bss is used). This can only mean that the
1630 * AP changed its beacon from not having an
1631 * SSID to showing it, which is confusing so
1632 * drop this information.
1633 */
1634
1635 f = rcu_access_pointer(new->pub.beacon_ies);
1636 kfree_rcu((struct cfg80211_bss_ies *)f, rcu_head);
1637 return false;
1638 }
1639
1640 old = rcu_access_pointer(known->pub.beacon_ies);
1641
1642 rcu_assign_pointer(known->pub.beacon_ies, new->pub.beacon_ies);
1643
1644 /* Override IEs if they were from a beacon before */
1645 if (old == rcu_access_pointer(known->pub.ies))
1646 rcu_assign_pointer(known->pub.ies, new->pub.beacon_ies);
1647
1648 /* Assign beacon IEs to all sub entries */
1649 list_for_each_entry(bss, &known->hidden_list, hidden_list) {
1650 const struct cfg80211_bss_ies *ies;
1651
1652 ies = rcu_access_pointer(bss->pub.beacon_ies);
1653 WARN_ON(ies != old);
1654
1655 rcu_assign_pointer(bss->pub.beacon_ies,
1656 new->pub.beacon_ies);
1657 }
1658
1659 if (old)
1660 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1661 }
1662
1663 known->pub.beacon_interval = new->pub.beacon_interval;
1664
1665 /* don't update the signal if beacon was heard on
1666 * adjacent channel.
1667 */
1668 if (signal_valid)
1669 known->pub.signal = new->pub.signal;
1670 known->pub.capability = new->pub.capability;
1671 known->ts = new->ts;
1672 known->ts_boottime = new->ts_boottime;
1673 known->parent_tsf = new->parent_tsf;
1674 known->pub.chains = new->pub.chains;
1675 memcpy(known->pub.chain_signal, new->pub.chain_signal,
1676 IEEE80211_MAX_CHAINS);
1677 ether_addr_copy(known->parent_bssid, new->parent_bssid);
1678 known->pub.max_bssid_indicator = new->pub.max_bssid_indicator;
1679 known->pub.bssid_index = new->pub.bssid_index;
1680
1681 return true;
1682}
1683
0e3a39b5 1684/* Returned bss is reference counted and must be cleaned up appropriately. */
a3ce17d1 1685struct cfg80211_internal_bss *
1b8ec87a 1686cfg80211_bss_update(struct cfg80211_registered_device *rdev,
3afc2167 1687 struct cfg80211_internal_bss *tmp,
a3ce17d1 1688 bool signal_valid, unsigned long ts)
2a519311
JB		 1689{
1690 struct cfg80211_internal_bss *found = NULL;
2a519311 1691
9caf0364 1692 if (WARN_ON(!tmp->pub.channel))
2a519311 1693 return NULL;
2a519311 1694
a3ce17d1 1695 tmp->ts = ts;
2a519311 1696
1b8ec87a 1697 spin_lock_bh(&rdev->bss_lock);
2a519311 1698
9caf0364 1699 if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) {
1b8ec87a 1700 spin_unlock_bh(&rdev->bss_lock);
9caf0364
JB		 1701 return NULL;
1702 }
1703
1b8ec87a 1704 found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR);
2a519311 1705
cd1658f5 1706 if (found) {
3ab8227d
SM		 1707 if (!cfg80211_update_known_bss(rdev, found, tmp, signal_valid))
1708 goto drop;
2a519311 1709 } else {
9caf0364 1710 struct cfg80211_internal_bss *new;
dd9dfb9f 1711 struct cfg80211_internal_bss *hidden;
9caf0364 1712 struct cfg80211_bss_ies *ies;
dd9dfb9f 1713
9caf0364
JB		 1714 /*
1715 * create a copy -- the "res" variable that is passed in
1716 * is allocated on the stack since it's not needed in the
1717 * more common case of an update
1718 */
1b8ec87a 1719 new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size,
9caf0364
JB		 1720 GFP_ATOMIC);
1721 if (!new) {
1722 ies = (void *)rcu_dereference(tmp->pub.beacon_ies);
1723 if (ies)
1724 kfree_rcu(ies, rcu_head);
1725 ies = (void *)rcu_dereference(tmp->pub.proberesp_ies);
1726 if (ies)
1727 kfree_rcu(ies, rcu_head);
776b3580 1728 goto drop;
9caf0364
JB		 1729 }
1730 memcpy(new, tmp, sizeof(*new));
776b3580
JB		 1731 new->refcount = 1;
1732 INIT_LIST_HEAD(&new->hidden_list);
7011ba58 1733 INIT_LIST_HEAD(&new->pub.nontrans_list);
776b3580
JB		 1734
1735 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
1b8ec87a 1736 hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN);
776b3580 1737 if (!hidden)
1b8ec87a 1738 hidden = rb_find_bss(rdev, tmp,
776b3580
JB		 1739 BSS_CMP_HIDE_NUL);
1740 if (hidden) {
1741 new->pub.hidden_beacon_bss = &hidden->pub;
1742 list_add(&new->hidden_list,
1743 &hidden->hidden_list);
1744 hidden->refcount++;
1745 rcu_assign_pointer(new->pub.beacon_ies,
1746 hidden->pub.beacon_ies);
1747 }
1748 } else {
1749 /*
1750 * Ok so we found a beacon, and don't have an entry. If
1751 * it's a beacon with hidden SSID, we might be in for an
1752 * expensive search for any probe responses that should
1753 * be grouped with this beacon for updates ...
1754 */
1b8ec87a 1755 if (!cfg80211_combine_bsses(rdev, new)) {
f9a5c358 1756 bss_ref_put(rdev, new);
776b3580
JB		 1757 goto drop;
1758 }
1759 }
1760
9853a55e
JB		 1761 if (rdev->bss_entries >= bss_entries_limit &&
1762 !cfg80211_bss_expire_oldest(rdev)) {
f9a5c358 1763 bss_ref_put(rdev, new);
9853a55e
JB		 1764 goto drop;
1765 }
1766
a3584f56 1767 /* This must be before the call to bss_ref_get */
0cd01efb 1768 if (tmp->pub.transmitted_bss) {
a3584f56 1769 struct cfg80211_internal_bss *pbss =
0cd01efb 1770 container_of(tmp->pub.transmitted_bss,
a3584f56
SS		 1771 struct cfg80211_internal_bss,
1772 pub);
1773
0cd01efb 1774 new->pub.transmitted_bss = tmp->pub.transmitted_bss;
a3584f56
SS		 1775 bss_ref_get(rdev, pbss);
1776 }
1777
1b8ec87a 1778 list_add_tail(&new->list, &rdev->bss_list);
9853a55e 1779 rdev->bss_entries++;
1b8ec87a 1780 rb_insert_bss(rdev, new);
9caf0364 1781 found = new;
2a519311
JB		 1782 }
1783
1b8ec87a
ZG		 1784 rdev->bss_generation++;
1785 bss_ref_get(rdev, found);
1786 spin_unlock_bh(&rdev->bss_lock);
2a519311 1787
2a519311 1788 return found;
776b3580 1789 drop:
1b8ec87a 1790 spin_unlock_bh(&rdev->bss_lock);
776b3580 1791 return NULL;
2a519311
JB		 1792}
1793
119f94a6
JM		 1794/*
1795 * Update RX channel information based on the available frame payload
1796 * information. This is mainly for the 2.4 GHz band where frames can be received
1797 * from neighboring channels and the Beacon frames use the DSSS Parameter Set
1798 * element to indicate the current (transmitting) channel, but this might also
1799 * be needed on other bands if RX frequency does not match with the actual
1800 * operating channel of a BSS.
1801 */
0172bb75
JB		 1802static struct ieee80211_channel *
1803cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
119f94a6
JM		 1804 struct ieee80211_channel *channel,
1805 enum nl80211_bss_scan_width scan_width)
0172bb75
JB		 1806{
1807 const u8 *tmp;
1808 u32 freq;
1809 int channel_number = -1;
119f94a6 1810 struct ieee80211_channel *alt_channel;
0172bb75 1811
66b0564d
TP		 1812 if (channel->band == NL80211_BAND_S1GHZ) {
1813 tmp = cfg80211_find_ie(WLAN_EID_S1G_OPERATION, ie, ielen);
1814 if (tmp && tmp[1] >= sizeof(struct ieee80211_s1g_oper_ie)) {
1815 struct ieee80211_s1g_oper_ie *s1gop = (void *)(tmp + 2);
1816
1817 channel_number = s1gop->primary_ch;
1818 }
0172bb75 1819 } else {
66b0564d
TP		 1820 tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen);
1821 if (tmp && tmp[1] == 1) {
1822 channel_number = tmp[2];
1823 } else {
1824 tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen);
1825 if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) {
1826 struct ieee80211_ht_operation *htop = (void *)(tmp + 2);
0172bb75 1827
66b0564d
TP		 1828 channel_number = htop->primary_chan;
1829 }
0172bb75
JB		 1830 }
1831 }
1832
119f94a6
JM		 1833 if (channel_number < 0) {
1834 /* No channel information in frame payload */
0172bb75 1835 return channel;
119f94a6 1836 }
0172bb75 1837
934f4c7d
TP		 1838 freq = ieee80211_channel_to_freq_khz(channel_number, channel->band);
1839 alt_channel = ieee80211_get_channel_khz(wiphy, freq);
119f94a6
JM		 1840 if (!alt_channel) {
1841 if (channel->band == NL80211_BAND_2GHZ) {
1842 /*
1843 * Better not allow unexpected channels when that could
1844 * be going beyond the 1-11 range (e.g., discovering
1845 * BSS on channel 12 when radio is configured for
1846 * channel 11.
1847 */
1848 return NULL;
1849 }
1850
1851 /* No match for the payload channel number - ignore it */
1852 return channel;
1853 }
1854
1855 if (scan_width == NL80211_BSS_CHAN_WIDTH_10 ||
1856 scan_width == NL80211_BSS_CHAN_WIDTH_5) {
1857 /*
1858 * Ignore channel number in 5 and 10 MHz channels where there
1859 * may not be an n:1 or 1:n mapping between frequencies and
1860 * channel numbers.
1861 */
1862 return channel;
1863 }
1864
1865 /*
1866 * Use the channel determined through the payload channel number
1867 * instead of the RX channel reported by the driver.
1868 */
1869 if (alt_channel->flags & IEEE80211_CHAN_DISABLED)
0172bb75 1870 return NULL;
119f94a6 1871 return alt_channel;
0172bb75
JB		 1872}
1873
0e3a39b5 1874/* Returned bss is reference counted and must be cleaned up appropriately. */
0b8fb823
PX		 1875static struct cfg80211_bss *
1876cfg80211_inform_single_bss_data(struct wiphy *wiphy,
1877 struct cfg80211_inform_bss *data,
1878 enum cfg80211_bss_frame_type ftype,
1879 const u8 *bssid, u64 tsf, u16 capability,
1880 u16 beacon_interval, const u8 *ie, size_t ielen,
0cd01efb 1881 struct cfg80211_non_tx_bss *non_tx_data,
0b8fb823 1882 gfp_t gfp)
06aa7afa 1883{
0b8fb823 1884 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
9caf0364 1885 struct cfg80211_bss_ies *ies;
3afc2167 1886 struct ieee80211_channel *channel;
7011ba58 1887 struct cfg80211_internal_bss tmp = {}, *res;
6eb18137 1888 int bss_type;
67af9811 1889 bool signal_valid;
60d7dfea 1890 unsigned long ts;
06aa7afa
JK		 1891
1892 if (WARN_ON(!wiphy))
1893 return NULL;
1894
22fe88d3 1895 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
6e19bc4b 1896 (data->signal < 0 || data->signal > 100)))
06aa7afa
JK		 1897 return NULL;
1898
119f94a6
JM		 1899 channel = cfg80211_get_bss_channel(wiphy, ie, ielen, data->chan,
1900 data->scan_width);
0172bb75
JB		 1901 if (!channel)
1902 return NULL;
1903
9caf0364
JB		 1904 memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
1905 tmp.pub.channel = channel;
6e19bc4b
DS		 1906 tmp.pub.scan_width = data->scan_width;
1907 tmp.pub.signal = data->signal;
9caf0364
JB		 1908 tmp.pub.beacon_interval = beacon_interval;
1909 tmp.pub.capability = capability;
6e19bc4b 1910 tmp.ts_boottime = data->boottime_ns;
b45a19dd
IP		 1911 tmp.parent_tsf = data->parent_tsf;
1912 ether_addr_copy(tmp.parent_bssid, data->parent_bssid);
1913
0cd01efb
SS		 1914 if (non_tx_data) {
1915 tmp.pub.transmitted_bss = non_tx_data->tx_bss;
60d7dfea 1916 ts = bss_from_pub(non_tx_data->tx_bss)->ts;
0cd01efb
SS		 1917 tmp.pub.bssid_index = non_tx_data->bssid_index;
1918 tmp.pub.max_bssid_indicator = non_tx_data->max_bssid_indicator;
60d7dfea
JB		 1919 } else {
1920 ts = jiffies;
0cd01efb 1921 }
6e19bc4b 1922
34a6eddb 1923 /*
5bc8c1f2 1924 * If we do not know here whether the IEs are from a Beacon or Probe
34a6eddb
JM		 1925 * Response frame, we need to pick one of the options and only use it
1926 * with the driver that does not provide the full Beacon/Probe Response
1927 * frame. Use Beacon frame pointer to avoid indicating that this should
50521aa8 1928 * override the IEs pointer should we have received an earlier
9caf0364 1929 * indication of Probe Response data.
34a6eddb 1930 */
0e227084 1931 ies = kzalloc(sizeof(*ies) + ielen, gfp);
9caf0364
JB		 1932 if (!ies)
1933 return NULL;
1934 ies->len = ielen;
8cef2c9d 1935 ies->tsf = tsf;
0e227084 1936 ies->from_beacon = false;
9caf0364 1937 memcpy(ies->data, ie, ielen);
06aa7afa 1938
5bc8c1f2
JB		 1939 switch (ftype) {
1940 case CFG80211_BSS_FTYPE_BEACON:
1941 ies->from_beacon = true;
7b506ff6 1942 fallthrough;
5bc8c1f2
JB		 1943 case CFG80211_BSS_FTYPE_UNKNOWN:
1944 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
1945 break;
1946 case CFG80211_BSS_FTYPE_PRESP:
1947 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
1948 break;
1949 }
9caf0364 1950 rcu_assign_pointer(tmp.pub.ies, ies);
06aa7afa 1951
7bb106eb 1952 signal_valid = data->chan == channel;
60d7dfea 1953 res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid, ts);
06aa7afa
JK		 1954 if (!res)
1955 return NULL;
1956
57fbcce3 1957 if (channel->band == NL80211_BAND_60GHZ) {
6eb18137
DL		 1958 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
1959 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
1960 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
1961 regulatory_hint_found_beacon(wiphy, channel, gfp);
1962 } else {
1963 if (res->pub.capability & WLAN_CAPABILITY_ESS)
1964 regulatory_hint_found_beacon(wiphy, channel, gfp);
1965 }
06aa7afa 1966
b0d1d7ff 1967 if (non_tx_data) {
0b8fb823
PX		 1968 /* this is a nontransmitting bss, we need to add it to
1969 * transmitting bss' list if it is not there
1970 */
0cd01efb
SS		 1971 if (cfg80211_add_nontrans_list(non_tx_data->tx_bss,
1972 &res->pub)) {
0b8fb823
PX		 1973 if (__cfg80211_unlink_bss(rdev, res))
1974 rdev->bss_generation++;
1975 }
1976 }
1977
4ee3e063 1978 trace_cfg80211_return_bss(&res->pub);
06aa7afa
JK		 1979 /* cfg80211_bss_update gives us a referenced result */
1980 return &res->pub;
1981}
06aa7afa 1982
fe806e49
SS		 1983static const struct element
1984*cfg80211_get_profile_continuation(const u8 *ie, size_t ielen,
1985 const struct element *mbssid_elem,
1986 const struct element *sub_elem)
1987{
1988 const u8 *mbssid_end = mbssid_elem->data + mbssid_elem->datalen;
1989 const struct element *next_mbssid;
1990 const struct element *next_sub;
1991
1992 next_mbssid = cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID,
1993 mbssid_end,
1994 ielen - (mbssid_end - ie));
1995
1996 /*
8cf5c86d 1997 * If it is not the last subelement in current MBSSID IE or there isn't
fe806e49
SS		 1998 * a next MBSSID IE - profile is complete.
1999 */
2000 if ((sub_elem->data + sub_elem->datalen < mbssid_end - 1) ||
2001 !next_mbssid)
2002 return NULL;
2003
2004 /* For any length error, just return NULL */
2005
2006 if (next_mbssid->datalen < 4)
2007 return NULL;
2008
2009 next_sub = (void *)&next_mbssid->data[1];
2010
2011 if (next_mbssid->data + next_mbssid->datalen <
2012 next_sub->data + next_sub->datalen)
2013 return NULL;
2014
2015 if (next_sub->id != 0 || next_sub->datalen < 2)
2016 return NULL;
2017
2018 /*
2019 * Check if the first element in the next sub element is a start
2020 * of a new profile
2021 */
2022 return next_sub->data[0] == WLAN_EID_NON_TX_BSSID_CAP ?
2023 NULL : next_mbssid;
2024}
2025
2026size_t cfg80211_merge_profile(const u8 *ie, size_t ielen,
2027 const struct element *mbssid_elem,
2028 const struct element *sub_elem,
5809a5d5 2029 u8 *merged_ie, size_t max_copy_len)
fe806e49
SS		 2030{
2031 size_t copied_len = sub_elem->datalen;
2032 const struct element *next_mbssid;
2033
2034 if (sub_elem->datalen > max_copy_len)
2035 return 0;
2036
5809a5d5 2037 memcpy(merged_ie, sub_elem->data, sub_elem->datalen);
fe806e49
SS		 2038
2039 while ((next_mbssid = cfg80211_get_profile_continuation(ie, ielen,
2040 mbssid_elem,
2041 sub_elem))) {
2042 const struct element *next_sub = (void *)&next_mbssid->data[1];
2043
2044 if (copied_len + next_sub->datalen > max_copy_len)
2045 break;
5809a5d5 2046 memcpy(merged_ie + copied_len, next_sub->data,
fe806e49
SS		 2047 next_sub->datalen);
2048 copied_len += next_sub->datalen;
2049 }
2050
2051 return copied_len;
2052}
2053EXPORT_SYMBOL(cfg80211_merge_profile);
2054
0b8fb823
PX		 2055static void cfg80211_parse_mbssid_data(struct wiphy *wiphy,
2056 struct cfg80211_inform_bss *data,
2057 enum cfg80211_bss_frame_type ftype,
2058 const u8 *bssid, u64 tsf,
2059 u16 beacon_interval, const u8 *ie,
2060 size_t ielen,
0cd01efb 2061 struct cfg80211_non_tx_bss *non_tx_data,
0b8fb823
PX		 2062 gfp_t gfp)
2063{
1c8745f3
JB		 2064 const u8 *mbssid_index_ie;
2065 const struct element *elem, *sub;
2066 size_t new_ie_len;
0b8fb823 2067 u8 new_bssid[ETH_ALEN];
fe806e49
SS		 2068 u8 *new_ie, *profile;
2069 u64 seen_indices = 0;
0b8fb823
PX		 2070 u16 capability;
2071 struct cfg80211_bss *bss;
2072
0cd01efb 2073 if (!non_tx_data)
0b8fb823
PX		 2074 return;
2075 if (!cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
2076 return;
213ed579
SS		 2077 if (!wiphy->support_mbssid)
2078 return;
2079 if (wiphy->support_only_he_mbssid &&
2080 !cfg80211_find_ext_ie(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen))
2081 return;
0b8fb823 2082
0b8fb823
PX		 2083 new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp);
2084 if (!new_ie)
2085 return;
2086
fe806e49
SS		 2087 profile = kmalloc(ielen, gfp);
2088 if (!profile)
2089 goto out;
2090
1c8745f3
JB		 2091 for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, ie, ielen) {
2092 if (elem->datalen < 4)
2093 continue;
2094 for_each_element(sub, elem->data + 1, elem->datalen - 1) {
fe806e49
SS		 2095 u8 profile_len;
2096
1c8745f3 2097 if (sub->id != 0 || sub->datalen < 4) {
0b8fb823
PX		 2098 /* not a valid BSS profile */
2099 continue;
2100 }
2101
1c8745f3
JB		 2102 if (sub->data[0] != WLAN_EID_NON_TX_BSSID_CAP ||
2103 sub->data[1] != 2) {
0b8fb823
PX		 2104 /* The first element within the Nontransmitted
2105 * BSSID Profile is not the Nontransmitted
2106 * BSSID Capability element.
2107 */
2108 continue;
2109 }
2110
fe806e49
SS		 2111 memset(profile, 0, ielen);
2112 profile_len = cfg80211_merge_profile(ie, ielen,
2113 elem,
2114 sub,
5809a5d5 2115 profile,
fe806e49
SS		 2116 ielen);
2117
0b8fb823
PX		 2118 /* found a Nontransmitted BSSID Profile */
2119 mbssid_index_ie = cfg80211_find_ie
2120 (WLAN_EID_MULTI_BSSID_IDX,
fe806e49 2121 profile, profile_len);
0b8fb823 2122 if (!mbssid_index_ie || mbssid_index_ie[1] < 1 ||
fe806e49
SS		 2123 mbssid_index_ie[2] == 0 ||
2124 mbssid_index_ie[2] > 46) {
0b8fb823
PX		 2125 /* No valid Multiple BSSID-Index element */
2126 continue;
2127 }
2128
ebb3ca3b 2129 if (seen_indices & BIT_ULL(mbssid_index_ie[2]))
fe806e49
SS		 2130 /* We don't support legacy split of a profile */
2131 net_dbg_ratelimited("Partial info for BSSID index %d\n",
2132 mbssid_index_ie[2]);
2133
ebb3ca3b 2134 seen_indices |= BIT_ULL(mbssid_index_ie[2]);
fe806e49 2135
0cd01efb
SS		 2136 non_tx_data->bssid_index = mbssid_index_ie[2];
2137 non_tx_data->max_bssid_indicator = elem->data[0];
2138
2139 cfg80211_gen_new_bssid(bssid,
2140 non_tx_data->max_bssid_indicator,
2141 non_tx_data->bssid_index,
0b8fb823
PX		 2142 new_bssid);
2143 memset(new_ie, 0, IEEE80211_MAX_DATA_LEN);
fe806e49
SS		 2144 new_ie_len = cfg80211_gen_new_ie(ie, ielen,
2145 profile,
2146 profile_len, new_ie,
0b8fb823
PX		 2147 gfp);
2148 if (!new_ie_len)
2149 continue;
2150
fe806e49 2151 capability = get_unaligned_le16(profile + 2);
0b8fb823
PX		 2152 bss = cfg80211_inform_single_bss_data(wiphy, data,
2153 ftype,
2154 new_bssid, tsf,
2155 capability,
2156 beacon_interval,
2157 new_ie,
2158 new_ie_len,
0cd01efb
SS		 2159 non_tx_data,
2160 gfp);
0b8fb823
PX		 2161 if (!bss)
2162 break;
2163 cfg80211_put_bss(wiphy, bss);
2164 }
0b8fb823
PX		 2165 }
2166
fe806e49 2167out:
0b8fb823 2168 kfree(new_ie);
fe806e49 2169 kfree(profile);
0b8fb823
PX		 2170}
2171
2a519311 2172struct cfg80211_bss *
0b8fb823
PX		 2173cfg80211_inform_bss_data(struct wiphy *wiphy,
2174 struct cfg80211_inform_bss *data,
2175 enum cfg80211_bss_frame_type ftype,
2176 const u8 *bssid, u64 tsf, u16 capability,
2177 u16 beacon_interval, const u8 *ie, size_t ielen,
2178 gfp_t gfp)
2179{
2180 struct cfg80211_bss *res;
0cd01efb 2181 struct cfg80211_non_tx_bss non_tx_data;
0b8fb823
PX		 2182
2183 res = cfg80211_inform_single_bss_data(wiphy, data, ftype, bssid, tsf,
2184 capability, beacon_interval, ie,
2185 ielen, NULL, gfp);
b0d1d7ff
JB		 2186 if (!res)
2187 return NULL;
0cd01efb 2188 non_tx_data.tx_bss = res;
0b8fb823 2189 cfg80211_parse_mbssid_data(wiphy, data, ftype, bssid, tsf,
0cd01efb
SS		 2190 beacon_interval, ie, ielen, &non_tx_data,
2191 gfp);
0b8fb823
PX		 2192 return res;
2193}
2194EXPORT_SYMBOL(cfg80211_inform_bss_data);
2195
2196static void
2197cfg80211_parse_mbssid_frame_data(struct wiphy *wiphy,
2198 struct cfg80211_inform_bss *data,
2199 struct ieee80211_mgmt *mgmt, size_t len,
0cd01efb 2200 struct cfg80211_non_tx_bss *non_tx_data,
0b8fb823
PX		 2201 gfp_t gfp)
2202{
2203 enum cfg80211_bss_frame_type ftype;
2204 const u8 *ie = mgmt->u.probe_resp.variable;
2205 size_t ielen = len - offsetof(struct ieee80211_mgmt,
2206 u.probe_resp.variable);
2207
2208 ftype = ieee80211_is_beacon(mgmt->frame_control) ?
2209 CFG80211_BSS_FTYPE_BEACON : CFG80211_BSS_FTYPE_PRESP;
2210
2211 cfg80211_parse_mbssid_data(wiphy, data, ftype, mgmt->bssid,
2212 le64_to_cpu(mgmt->u.probe_resp.timestamp),
2213 le16_to_cpu(mgmt->u.probe_resp.beacon_int),
0cd01efb 2214 ie, ielen, non_tx_data, gfp);
0b8fb823
PX		 2215}
2216
2217static void
2218cfg80211_update_notlisted_nontrans(struct wiphy *wiphy,
7011ba58 2219 struct cfg80211_bss *nontrans_bss,
461c4c2b 2220 struct ieee80211_mgmt *mgmt, size_t len)
0b8fb823
PX		 2221{
2222 u8 *ie, *new_ie, *pos;
2223 const u8 *nontrans_ssid, *trans_ssid, *mbssid;
2224 size_t ielen = len - offsetof(struct ieee80211_mgmt,
2225 u.probe_resp.variable);
2226 size_t new_ie_len;
2227 struct cfg80211_bss_ies *new_ies;
2228 const struct cfg80211_bss_ies *old;
2229 u8 cpy_len;
2230
461c4c2b
SS		 2231 lockdep_assert_held(&wiphy_to_rdev(wiphy)->bss_lock);
2232
0b8fb823
PX		 2233 ie = mgmt->u.probe_resp.variable;
2234
2235 new_ie_len = ielen;
2236 trans_ssid = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen);
2237 if (!trans_ssid)
2238 return;
2239 new_ie_len -= trans_ssid[1];
2240 mbssid = cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen);
242b0931
JB		 2241 /*
2242 * It's not valid to have the MBSSID element before SSID
2243 * ignore if that happens - the code below assumes it is
2244 * after (while copying things inbetween).
2245 */
2246 if (!mbssid || mbssid < trans_ssid)
0b8fb823
PX		 2247 return;
2248 new_ie_len -= mbssid[1];
461c4c2b 2249
7011ba58 2250 nontrans_ssid = ieee80211_bss_get_ie(nontrans_bss, WLAN_EID_SSID);
461c4c2b 2251 if (!nontrans_ssid)
0b8fb823 2252 return;
461c4c2b 2253
0b8fb823 2254 new_ie_len += nontrans_ssid[1];
0b8fb823
PX		 2255
2256 /* generate new ie for nontrans BSS
2257 * 1. replace SSID with nontrans BSS' SSID
2258 * 2. skip MBSSID IE
2259 */
461c4c2b 2260 new_ie = kzalloc(new_ie_len, GFP_ATOMIC);
0b8fb823
PX		 2261 if (!new_ie)
2262 return;
461c4c2b
SS		 2263
2264 new_ies = kzalloc(sizeof(*new_ies) + new_ie_len, GFP_ATOMIC);
bede8d29
SS		 2265 if (!new_ies)
2266 goto out_free;
0b8fb823
PX		 2267
2268 pos = new_ie;
2269
2270 /* copy the nontransmitted SSID */
2271 cpy_len = nontrans_ssid[1] + 2;
2272 memcpy(pos, nontrans_ssid, cpy_len);
2273 pos += cpy_len;
2274 /* copy the IEs between SSID and MBSSID */
2275 cpy_len = trans_ssid[1] + 2;
2276 memcpy(pos, (trans_ssid + cpy_len), (mbssid - (trans_ssid + cpy_len)));
2277 pos += (mbssid - (trans_ssid + cpy_len));
2278 /* copy the IEs after MBSSID */
2279 cpy_len = mbssid[1] + 2;
2280 memcpy(pos, mbssid + cpy_len, ((ie + ielen) - (mbssid + cpy_len)));
2281
2282 /* update ie */
2283 new_ies->len = new_ie_len;
2284 new_ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
2285 new_ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control);
2286 memcpy(new_ies->data, new_ie, new_ie_len);
2287 if (ieee80211_is_probe_resp(mgmt->frame_control)) {
7011ba58
SS		 2288 old = rcu_access_pointer(nontrans_bss->proberesp_ies);
2289 rcu_assign_pointer(nontrans_bss->proberesp_ies, new_ies);
2290 rcu_assign_pointer(nontrans_bss->ies, new_ies);
0b8fb823
PX		 2291 if (old)
2292 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
2293 } else {
7011ba58
SS		 2294 old = rcu_access_pointer(nontrans_bss->beacon_ies);
2295 rcu_assign_pointer(nontrans_bss->beacon_ies, new_ies);
2296 rcu_assign_pointer(nontrans_bss->ies, new_ies);
0b8fb823
PX		 2297 if (old)
2298 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
2299 }
bede8d29
SS		 2300
2301out_free:
2302 kfree(new_ie);
0b8fb823 2303}
6e19bc4b 2304
0b8fb823
PX		 2305/* cfg80211_inform_bss_width_frame helper */
2306static struct cfg80211_bss *
2307cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy,
2308 struct cfg80211_inform_bss *data,
2309 struct ieee80211_mgmt *mgmt, size_t len,
0b8fb823 2310 gfp_t gfp)
2a519311 2311{
9caf0364
JB		 2312 struct cfg80211_internal_bss tmp = {}, *res;
2313 struct cfg80211_bss_ies *ies;
3afc2167 2314 struct ieee80211_channel *channel;
67af9811 2315 bool signal_valid;
9eaffe50
TP		 2316 struct ieee80211_ext *ext = NULL;
2317 u8 *bssid, *variable;
2318 u16 capability, beacon_int;
2319 size_t ielen, min_hdr_len = offsetof(struct ieee80211_mgmt,
2320 u.probe_resp.variable);
6eb18137 2321 int bss_type;
bef9bacc 2322
0172bb75
JB		 2323 BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
2324 offsetof(struct ieee80211_mgmt, u.beacon.variable));
2325
6e19bc4b 2326 trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len);
4ee3e063 2327
bef9bacc
MK		 2328 if (WARN_ON(!mgmt))
2329 return NULL;
2330
2331 if (WARN_ON(!wiphy))
2332 return NULL;
2a519311 2333
22fe88d3 2334 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
6e19bc4b 2335 (data->signal < 0 || data->signal > 100)))
2a519311
JB		 2336 return NULL;
2337
9eaffe50
TP		 2338 if (ieee80211_is_s1g_beacon(mgmt->frame_control)) {
2339 ext = (void *) mgmt;
2340 min_hdr_len = offsetof(struct ieee80211_ext, u.s1g_beacon);
2341 if (ieee80211_is_s1g_short_beacon(mgmt->frame_control))
2342 min_hdr_len = offsetof(struct ieee80211_ext,
2343 u.s1g_short_beacon.variable);
2344 }
2345
2346 if (WARN_ON(len < min_hdr_len))
2a519311
JB		 2347 return NULL;
2348
9eaffe50
TP		 2349 ielen = len - min_hdr_len;
2350 variable = mgmt->u.probe_resp.variable;
2351 if (ext) {
2352 if (ieee80211_is_s1g_short_beacon(mgmt->frame_control))
2353 variable = ext->u.s1g_short_beacon.variable;
2354 else
2355 variable = ext->u.s1g_beacon.variable;
2356 }
2357
2358 channel = cfg80211_get_bss_channel(wiphy, variable,
119f94a6 2359 ielen, data->chan, data->scan_width);
0172bb75
JB		 2360 if (!channel)
2361 return NULL;
2362
9eaffe50 2363 if (ext) {
b5ac0146
JB		 2364 const struct ieee80211_s1g_bcn_compat_ie *compat;
2365 const struct element *elem;
9eaffe50 2366
b5ac0146
JB		 2367 elem = cfg80211_find_elem(WLAN_EID_S1G_BCN_COMPAT,
2368 variable, ielen);
2369 if (!elem)
2370 return NULL;
2371 if (elem->datalen < sizeof(*compat))
9eaffe50 2372 return NULL;
b5ac0146 2373 compat = (void *)elem->data;
9eaffe50
TP		 2374 bssid = ext->u.s1g_beacon.sa;
2375 capability = le16_to_cpu(compat->compat_info);
2376 beacon_int = le16_to_cpu(compat->beacon_int);
2377 } else {
2378 bssid = mgmt->bssid;
2379 beacon_int = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
2380 capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
2381 }
2382
0e227084 2383 ies = kzalloc(sizeof(*ies) + ielen, gfp);
9caf0364 2384 if (!ies)
2a519311 2385 return NULL;
9caf0364 2386 ies->len = ielen;
8cef2c9d 2387 ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
9eaffe50
TP		 2388 ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control) ||
2389 ieee80211_is_s1g_beacon(mgmt->frame_control);
2390 memcpy(ies->data, variable, ielen);
2a519311 2391
9caf0364
JB		 2392 if (ieee80211_is_probe_resp(mgmt->frame_control))
2393 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
2394 else
2395 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
2396 rcu_assign_pointer(tmp.pub.ies, ies);
505a2e88 2397
9eaffe50
TP		 2398 memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
2399 tmp.pub.beacon_interval = beacon_int;
2400 tmp.pub.capability = capability;
9caf0364 2401 tmp.pub.channel = channel;
6e19bc4b
DS		 2402 tmp.pub.scan_width = data->scan_width;
2403 tmp.pub.signal = data->signal;
6e19bc4b 2404 tmp.ts_boottime = data->boottime_ns;
1d76250b 2405 tmp.parent_tsf = data->parent_tsf;
983dafaa
SD		 2406 tmp.pub.chains = data->chains;
2407 memcpy(tmp.pub.chain_signal, data->chain_signal, IEEE80211_MAX_CHAINS);
1d76250b 2408 ether_addr_copy(tmp.parent_bssid, data->parent_bssid);
9caf0364 2409
7bb106eb 2410 signal_valid = data->chan == channel;
a3ce17d1
CT		 2411 res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid,
2412 jiffies);
2a519311
JB		 2413 if (!res)
2414 return NULL;
2415
57fbcce3 2416 if (channel->band == NL80211_BAND_60GHZ) {
6eb18137
DL		 2417 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
2418 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
2419 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
2420 regulatory_hint_found_beacon(wiphy, channel, gfp);
2421 } else {
2422 if (res->pub.capability & WLAN_CAPABILITY_ESS)
2423 regulatory_hint_found_beacon(wiphy, channel, gfp);
2424 }
e38f8a7a 2425
4ee3e063 2426 trace_cfg80211_return_bss(&res->pub);
2a519311
JB		 2427 /* cfg80211_bss_update gives us a referenced result */
2428 return &res->pub;
2429}
0b8fb823
PX		 2430
2431struct cfg80211_bss *
2432cfg80211_inform_bss_frame_data(struct wiphy *wiphy,
2433 struct cfg80211_inform_bss *data,
2434 struct ieee80211_mgmt *mgmt, size_t len,
2435 gfp_t gfp)
2436{
7011ba58 2437 struct cfg80211_bss *res, *tmp_bss;
0b8fb823
PX		 2438 const u8 *ie = mgmt->u.probe_resp.variable;
2439 const struct cfg80211_bss_ies *ies1, *ies2;
2440 size_t ielen = len - offsetof(struct ieee80211_mgmt,
2441 u.probe_resp.variable);
0cd01efb 2442 struct cfg80211_non_tx_bss non_tx_data;
0b8fb823
PX		 2443
2444 res = cfg80211_inform_single_bss_frame_data(wiphy, data, mgmt,
84f1772b 2445 len, gfp);
213ed579
SS		 2446 if (!res || !wiphy->support_mbssid ||
2447 !cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
2448 return res;
2449 if (wiphy->support_only_he_mbssid &&
2450 !cfg80211_find_ext_ie(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen))
0b8fb823
PX		 2451 return res;
2452
0cd01efb 2453 non_tx_data.tx_bss = res;
0b8fb823 2454 /* process each non-transmitting bss */
0cd01efb
SS		 2455 cfg80211_parse_mbssid_frame_data(wiphy, data, mgmt, len,
2456 &non_tx_data, gfp);
0b8fb823 2457
461c4c2b
SS		 2458 spin_lock_bh(&wiphy_to_rdev(wiphy)->bss_lock);
2459
0b8fb823
PX		 2460 /* check if the res has other nontransmitting bss which is not
2461 * in MBSSID IE
2462 */
2463 ies1 = rcu_access_pointer(res->ies);
0b8fb823
PX		 2464
2465 /* go through nontrans_list, if the timestamp of the BSS is
2466 * earlier than the timestamp of the transmitting BSS then
2467 * update it
2468 */
7011ba58 2469 list_for_each_entry(tmp_bss, &res->nontrans_list,
0b8fb823 2470 nontrans_list) {
7011ba58 2471 ies2 = rcu_access_pointer(tmp_bss->ies);
0b8fb823
PX		 2472 if (ies2->tsf < ies1->tsf)
2473 cfg80211_update_notlisted_nontrans(wiphy, tmp_bss,
461c4c2b 2474 mgmt, len);
0b8fb823 2475 }
461c4c2b 2476 spin_unlock_bh(&wiphy_to_rdev(wiphy)->bss_lock);
0b8fb823
PX		 2477
2478 return res;
2479}
6e19bc4b 2480EXPORT_SYMBOL(cfg80211_inform_bss_frame_data);
2a519311 2481
5b112d3d 2482void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
4c0c0b75 2483{
f26cbf40 2484 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
4c0c0b75
JB		 2485 struct cfg80211_internal_bss *bss;
2486
2487 if (!pub)
2488 return;
2489
2490 bss = container_of(pub, struct cfg80211_internal_bss, pub);
776b3580 2491
1b8ec87a
ZG		 2492 spin_lock_bh(&rdev->bss_lock);
2493 bss_ref_get(rdev, bss);
2494 spin_unlock_bh(&rdev->bss_lock);
4c0c0b75
JB		 2495}
2496EXPORT_SYMBOL(cfg80211_ref_bss);
2497
5b112d3d 2498void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
2a519311 2499{
f26cbf40 2500 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2a519311
JB		 2501 struct cfg80211_internal_bss *bss;
2502
2503 if (!pub)
2504 return;
2505
2506 bss = container_of(pub, struct cfg80211_internal_bss, pub);
776b3580 2507
1b8ec87a
ZG		 2508 spin_lock_bh(&rdev->bss_lock);
2509 bss_ref_put(rdev, bss);
2510 spin_unlock_bh(&rdev->bss_lock);
2a519311
JB		 2511}
2512EXPORT_SYMBOL(cfg80211_put_bss);
2513
d491af19
JB		 2514void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
2515{
f26cbf40 2516 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
7011ba58
SS		 2517 struct cfg80211_internal_bss *bss, *tmp1;
2518 struct cfg80211_bss *nontrans_bss, *tmp;
d491af19
JB		 2519
2520 if (WARN_ON(!pub))
2521 return;
2522
2523 bss = container_of(pub, struct cfg80211_internal_bss, pub);
2524
1b8ec87a 2525 spin_lock_bh(&rdev->bss_lock);
7011ba58
SS		 2526 if (list_empty(&bss->list))
2527 goto out;
2528
2529 list_for_each_entry_safe(nontrans_bss, tmp,
2530 &pub->nontrans_list,
2531 nontrans_list) {
2532 tmp1 = container_of(nontrans_bss,
2533 struct cfg80211_internal_bss, pub);
2534 if (__cfg80211_unlink_bss(rdev, tmp1))
1b8ec87a 2535 rdev->bss_generation++;
3207390a 2536 }
7011ba58
SS		 2537
2538 if (__cfg80211_unlink_bss(rdev, bss))
2539 rdev->bss_generation++;
2540out:
1b8ec87a 2541 spin_unlock_bh(&rdev->bss_lock);
d491af19
JB		 2542}
2543EXPORT_SYMBOL(cfg80211_unlink_bss);
2544
4770c8f9
IP		 2545void cfg80211_bss_iter(struct wiphy *wiphy,
2546 struct cfg80211_chan_def *chandef,
2547 void (*iter)(struct wiphy *wiphy,
2548 struct cfg80211_bss *bss,
2549 void *data),
2550 void *iter_data)
2551{
2552 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2553 struct cfg80211_internal_bss *bss;
2554
2555 spin_lock_bh(&rdev->bss_lock);
2556
2557 list_for_each_entry(bss, &rdev->bss_list, list) {
2558 if (!chandef || cfg80211_is_sub_chan(chandef, bss->pub.channel))
2559 iter(wiphy, &bss->pub, iter_data);
2560 }
2561
2562 spin_unlock_bh(&rdev->bss_lock);
2563}
2564EXPORT_SYMBOL(cfg80211_bss_iter);
2565
0afd425b
SM		 2566void cfg80211_update_assoc_bss_entry(struct wireless_dev *wdev,
2567 struct ieee80211_channel *chan)
2568{
2569 struct wiphy *wiphy = wdev->wiphy;
2570 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2571 struct cfg80211_internal_bss *cbss = wdev->current_bss;
2572 struct cfg80211_internal_bss *new = NULL;
2573 struct cfg80211_internal_bss *bss;
2574 struct cfg80211_bss *nontrans_bss;
2575 struct cfg80211_bss *tmp;
2576
2577 spin_lock_bh(&rdev->bss_lock);
2578
05dcb8bb
IP		 2579 /*
2580 * Some APs use CSA also for bandwidth changes, i.e., without actually
2581 * changing the control channel, so no need to update in such a case.
2582 */
2583 if (cbss->pub.channel == chan)
0afd425b
SM		 2584 goto done;
2585
2586 /* use transmitting bss */
2587 if (cbss->pub.transmitted_bss)
2588 cbss = container_of(cbss->pub.transmitted_bss,
2589 struct cfg80211_internal_bss,
2590 pub);
2591
2592 cbss->pub.channel = chan;
2593
2594 list_for_each_entry(bss, &rdev->bss_list, list) {
2595 if (!cfg80211_bss_type_match(bss->pub.capability,
2596 bss->pub.channel->band,
2597 wdev->conn_bss_type))
2598 continue;
2599
2600 if (bss == cbss)
2601 continue;
2602
2603 if (!cmp_bss(&bss->pub, &cbss->pub, BSS_CMP_REGULAR)) {
2604 new = bss;
2605 break;
2606 }
2607 }
2608
2609 if (new) {
2610 /* to save time, update IEs for transmitting bss only */
2611 if (cfg80211_update_known_bss(rdev, cbss, new, false)) {
2612 new->pub.proberesp_ies = NULL;
2613 new->pub.beacon_ies = NULL;
2614 }
2615
2616 list_for_each_entry_safe(nontrans_bss, tmp,
2617 &new->pub.nontrans_list,
2618 nontrans_list) {
2619 bss = container_of(nontrans_bss,
2620 struct cfg80211_internal_bss, pub);
2621 if (__cfg80211_unlink_bss(rdev, bss))
2622 rdev->bss_generation++;
2623 }
2624
2625 WARN_ON(atomic_read(&new->hold));
2626 if (!WARN_ON(!__cfg80211_unlink_bss(rdev, new)))
2627 rdev->bss_generation++;
2628 }
2629
2630 rb_erase(&cbss->rbn, &rdev->bss_tree);
2631 rb_insert_bss(rdev, cbss);
2632 rdev->bss_generation++;
2633
2634 list_for_each_entry_safe(nontrans_bss, tmp,
2635 &cbss->pub.nontrans_list,
2636 nontrans_list) {
2637 bss = container_of(nontrans_bss,
2638 struct cfg80211_internal_bss, pub);
2639 bss->pub.channel = chan;
2640 rb_erase(&bss->rbn, &rdev->bss_tree);
2641 rb_insert_bss(rdev, bss);
2642 rdev->bss_generation++;
2643 }
2644
2645done:
2646 spin_unlock_bh(&rdev->bss_lock);
2647}
2648
3d23e349 2649#ifdef CONFIG_CFG80211_WEXT
9f419f38
JB		 2650static struct cfg80211_registered_device *
2651cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
2652{
5fe231e8 2653 struct cfg80211_registered_device *rdev;
9f419f38
JB		 2654 struct net_device *dev;
2655
5fe231e8
JB		 2656 ASSERT_RTNL();
2657
9f419f38
JB		 2658 dev = dev_get_by_index(net, ifindex);
2659 if (!dev)
5fe231e8
JB		 2660 return ERR_PTR(-ENODEV);
2661 if (dev->ieee80211_ptr)
f26cbf40 2662 rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy);
5fe231e8 2663 else
9f419f38
JB		 2664 rdev = ERR_PTR(-ENODEV);
2665 dev_put(dev);
9f419f38
JB		 2666 return rdev;
2667}
2668
2a519311
JB		 2669int cfg80211_wext_siwscan(struct net_device *dev,
2670 struct iw_request_info *info,
2671 union iwreq_data *wrqu, char *extra)
2672{
2673 struct cfg80211_registered_device *rdev;
2674 struct wiphy *wiphy;
2675 struct iw_scan_req *wreq = NULL;
65486c8b 2676 struct cfg80211_scan_request *creq = NULL;
2a519311 2677 int i, err, n_channels = 0;
57fbcce3 2678 enum nl80211_band band;
2a519311
JB		 2679
2680 if (!netif_running(dev))
2681 return -ENETDOWN;
2682
b2e3abdc
HS		 2683 if (wrqu->data.length == sizeof(struct iw_scan_req))
2684 wreq = (struct iw_scan_req *)extra;
2685
463d0183 2686 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
2a519311
JB		 2687
2688 if (IS_ERR(rdev))
2689 return PTR_ERR(rdev);
2690
f9d15d16 2691 if (rdev->scan_req || rdev->scan_msg) {
2a519311
JB		 2692 err = -EBUSY;
2693 goto out;
2694 }
2695
2696 wiphy = &rdev->wiphy;
2697
b2e3abdc
HS		 2698 /* Determine number of channels, needed to allocate creq */
2699 if (wreq && wreq->num_channels)
2700 n_channels = wreq->num_channels;
bdfbec2d
IP		 2701 else
2702 n_channels = ieee80211_get_num_supported_channels(wiphy);
2a519311
JB		 2703
2704 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
2705 n_channels * sizeof(void *),
2706 GFP_ATOMIC);
2707 if (!creq) {
2708 err = -ENOMEM;
2709 goto out;
2710 }
2711
2712 creq->wiphy = wiphy;
fd014284 2713 creq->wdev = dev->ieee80211_ptr;
5ba63533
JB		 2714 /* SSIDs come after channels */
2715 creq->ssids = (void *)&creq->channels[n_channels];
2a519311
JB		 2716 creq->n_channels = n_channels;
2717 creq->n_ssids = 1;
15d6030b 2718 creq->scan_start = jiffies;
2a519311 2719
b2e3abdc 2720 /* translate "Scan on frequencies" request */
2a519311 2721 i = 0;
57fbcce3 2722 for (band = 0; band < NUM_NL80211_BANDS; band++) {
2a519311 2723 int j;
584991dc 2724
2a519311
JB		 2725 if (!wiphy->bands[band])
2726 continue;
584991dc 2727
2a519311 2728 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
584991dc
JB		 2729 /* ignore disabled channels */
2730 if (wiphy->bands[band]->channels[j].flags &
2731 IEEE80211_CHAN_DISABLED)
2732 continue;
b2e3abdc
HS		 2733
2734 /* If we have a wireless request structure and the
2735 * wireless request specifies frequencies, then search
2736 * for the matching hardware channel.
2737 */
2738 if (wreq && wreq->num_channels) {
2739 int k;
2740 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
2741 for (k = 0; k < wreq->num_channels; k++) {
96998e3a
ZG		 2742 struct iw_freq *freq =
2743 &wreq->channel_list[k];
2744 int wext_freq =
2745 cfg80211_wext_freq(freq);
2746
b2e3abdc
HS		 2747 if (wext_freq == wiphy_freq)
2748 goto wext_freq_found;
2749 }
2750 goto wext_freq_not_found;
2751 }
2752
2753 wext_freq_found:
2a519311
JB		 2754 creq->channels[i] = &wiphy->bands[band]->channels[j];
2755 i++;
b2e3abdc 2756 wext_freq_not_found: ;
2a519311
JB		 2757 }
2758 }
8862dc5f
HS		 2759 /* No channels found? */
2760 if (!i) {
2761 err = -EINVAL;
2762 goto out;
2763 }
2a519311 2764
b2e3abdc
HS		 2765 /* Set real number of channels specified in creq->channels[] */
2766 creq->n_channels = i;
2a519311 2767
b2e3abdc
HS		 2768 /* translate "Scan for SSID" request */
2769 if (wreq) {
2a519311 2770 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
65486c8b
JB		 2771 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
2772 err = -EINVAL;
2773 goto out;
2774 }
2a519311
JB		 2775 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
2776 creq->ssids[0].ssid_len = wreq->essid_len;
2777 }
2778 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
2779 creq->n_ssids = 0;
2780 }
2781
57fbcce3 2782 for (i = 0; i < NUM_NL80211_BANDS; i++)
a401d2bb
JB		 2783 if (wiphy->bands[i])
2784 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
34850ab2 2785
818965d3
JM		 2786 eth_broadcast_addr(creq->bssid);
2787
a05829a7
JB		 2788 wiphy_lock(&rdev->wiphy);
2789
2a519311 2790 rdev->scan_req = creq;
e35e4d28 2791 err = rdev_scan(rdev, creq);
2a519311
JB		 2792 if (err) {
2793 rdev->scan_req = NULL;
65486c8b 2794 /* creq will be freed below */
463d0183 2795 } else {
fd014284 2796 nl80211_send_scan_start(rdev, dev->ieee80211_ptr);
65486c8b
JB		 2797 /* creq now owned by driver */
2798 creq = NULL;
463d0183
JB		 2799 dev_hold(dev);
2800 }
a05829a7 2801 wiphy_unlock(&rdev->wiphy);
2a519311 2802 out:
65486c8b 2803 kfree(creq);
2a519311
JB		 2804 return err;
2805}
2afe38d1 2806EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan);
2a519311 2807
76a70e9c
JM		 2808static char *ieee80211_scan_add_ies(struct iw_request_info *info,
2809 const struct cfg80211_bss_ies *ies,
2810 char *current_ev, char *end_buf)
2a519311 2811{
9caf0364 2812 const u8 *pos, *end, *next;
2a519311
JB		 2813 struct iw_event iwe;
2814
9caf0364 2815 if (!ies)
76a70e9c 2816 return current_ev;
2a519311
JB		 2817
2818 /*
2819 * If needed, fragment the IEs buffer (at IE boundaries) into short
2820 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
2821 */
9caf0364
JB		 2822 pos = ies->data;
2823 end = pos + ies->len;
2a519311
JB		 2824
2825 while (end - pos > IW_GENERIC_IE_MAX) {
2826 next = pos + 2 + pos[1];
2827 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
2828 next = next + 2 + next[1];
2829
2830 memset(&iwe, 0, sizeof(iwe));
2831 iwe.cmd = IWEVGENIE;
2832 iwe.u.data.length = next - pos;
76a70e9c
JM		 2833 current_ev = iwe_stream_add_point_check(info, current_ev,
2834 end_buf, &iwe,
2835 (void *)pos);
2836 if (IS_ERR(current_ev))
2837 return current_ev;
2a519311
JB		 2838 pos = next;
2839 }
2840
2841 if (end > pos) {
2842 memset(&iwe, 0, sizeof(iwe));
2843 iwe.cmd = IWEVGENIE;
2844 iwe.u.data.length = end - pos;
76a70e9c
JM		 2845 current_ev = iwe_stream_add_point_check(info, current_ev,
2846 end_buf, &iwe,
2847 (void *)pos);
2848 if (IS_ERR(current_ev))
2849 return current_ev;
2a519311 2850 }
76a70e9c
JM		 2851
2852 return current_ev;
2a519311
JB		 2853}
2854
2a519311 2855static char *
77965c97
JB		 2856ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
2857 struct cfg80211_internal_bss *bss, char *current_ev,
2858 char *end_buf)
2a519311 2859{
9caf0364 2860 const struct cfg80211_bss_ies *ies;
2a519311 2861 struct iw_event iwe;
9caf0364 2862 const u8 *ie;
76a70e9c
JM		 2863 u8 buf[50];
2864 u8 *cfg, *p, *tmp;
9caf0364 2865 int rem, i, sig;
2a519311
JB		 2866 bool ismesh = false;
2867
2868 memset(&iwe, 0, sizeof(iwe));
2869 iwe.cmd = SIOCGIWAP;
2870 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
2871 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
76a70e9c
JM		 2872 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2873 IW_EV_ADDR_LEN);
2874 if (IS_ERR(current_ev))
2875 return current_ev;
2a519311
JB		 2876
2877 memset(&iwe, 0, sizeof(iwe));
2878 iwe.cmd = SIOCGIWFREQ;
2879 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
2880 iwe.u.freq.e = 0;
76a70e9c
JM		 2881 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2882 IW_EV_FREQ_LEN);
2883 if (IS_ERR(current_ev))
2884 return current_ev;
2a519311
JB		 2885
2886 memset(&iwe, 0, sizeof(iwe));
2887 iwe.cmd = SIOCGIWFREQ;
2888 iwe.u.freq.m = bss->pub.channel->center_freq;
2889 iwe.u.freq.e = 6;
76a70e9c
JM		 2890 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2891 IW_EV_FREQ_LEN);
2892 if (IS_ERR(current_ev))
2893 return current_ev;
2a519311 2894
77965c97 2895 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
2a519311
JB		 2896 memset(&iwe, 0, sizeof(iwe));
2897 iwe.cmd = IWEVQUAL;
2898 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
2899 IW_QUAL_NOISE_INVALID |
a77b8552 2900 IW_QUAL_QUAL_UPDATED;
77965c97 2901 switch (wiphy->signal_type) {
2a519311 2902 case CFG80211_SIGNAL_TYPE_MBM:
a77b8552
JB		 2903 sig = bss->pub.signal / 100;
2904 iwe.u.qual.level = sig;
2a519311 2905 iwe.u.qual.updated |= IW_QUAL_DBM;
a77b8552
JB		 2906 if (sig < -110) /* rather bad */
2907 sig = -110;
2908 else if (sig > -40) /* perfect */
2909 sig = -40;
2910 /* will give a range of 0 .. 70 */
2911 iwe.u.qual.qual = sig + 110;
2a519311
JB		 2912 break;
2913 case CFG80211_SIGNAL_TYPE_UNSPEC:
2914 iwe.u.qual.level = bss->pub.signal;
a77b8552
JB		 2915 /* will give range 0 .. 100 */
2916 iwe.u.qual.qual = bss->pub.signal;
2a519311
JB		 2917 break;
2918 default:
2919 /* not reached */
2920 break;
2921 }
76a70e9c
JM		 2922 current_ev = iwe_stream_add_event_check(info, current_ev,
2923 end_buf, &iwe,
2924 IW_EV_QUAL_LEN);
2925 if (IS_ERR(current_ev))
2926 return current_ev;
2a519311
JB		 2927 }
2928
2929 memset(&iwe, 0, sizeof(iwe));
2930 iwe.cmd = SIOCGIWENCODE;
2931 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
2932 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
2933 else
2934 iwe.u.data.flags = IW_ENCODE_DISABLED;
2935 iwe.u.data.length = 0;
76a70e9c
JM		 2936 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
2937 &iwe, "");
2938 if (IS_ERR(current_ev))
2939 return current_ev;
2a519311 2940
9caf0364
JB		 2941 rcu_read_lock();
2942 ies = rcu_dereference(bss->pub.ies);
83c7aa1a
JB		 2943 rem = ies->len;
2944 ie = ies->data;
9caf0364 2945
83c7aa1a 2946 while (rem >= 2) {
2a519311
JB		 2947 /* invalid data */
2948 if (ie[1] > rem - 2)
2949 break;
2950
2951 switch (ie[0]) {
2952 case WLAN_EID_SSID:
2953 memset(&iwe, 0, sizeof(iwe));
2954 iwe.cmd = SIOCGIWESSID;
2955 iwe.u.data.length = ie[1];
2956 iwe.u.data.flags = 1;
76a70e9c
JM		 2957 current_ev = iwe_stream_add_point_check(info,
2958 current_ev,
2959 end_buf, &iwe,
2960 (u8 *)ie + 2);
2961 if (IS_ERR(current_ev))
2962 goto unlock;
2a519311
JB		 2963 break;
2964 case WLAN_EID_MESH_ID:
2965 memset(&iwe, 0, sizeof(iwe));
2966 iwe.cmd = SIOCGIWESSID;
2967 iwe.u.data.length = ie[1];
2968 iwe.u.data.flags = 1;
76a70e9c
JM		 2969 current_ev = iwe_stream_add_point_check(info,
2970 current_ev,
2971 end_buf, &iwe,
2972 (u8 *)ie + 2);
2973 if (IS_ERR(current_ev))
2974 goto unlock;
2a519311
JB		 2975 break;
2976 case WLAN_EID_MESH_CONFIG:
2977 ismesh = true;
136cfa28 2978 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
2a519311 2979 break;
9caf0364 2980 cfg = (u8 *)ie + 2;
2a519311
JB		 2981 memset(&iwe, 0, sizeof(iwe));
2982 iwe.cmd = IWEVCUSTOM;
76aa5e70
RP		 2983 sprintf(buf, "Mesh Network Path Selection Protocol ID: "
2984 "0x%02X", cfg[0]);
2a519311 2985 iwe.u.data.length = strlen(buf);
76a70e9c
JM		 2986 current_ev = iwe_stream_add_point_check(info,
2987 current_ev,
2988 end_buf,
2989 &iwe, buf);
2990 if (IS_ERR(current_ev))
2991 goto unlock;
76aa5e70
RP		 2992 sprintf(buf, "Path Selection Metric ID: 0x%02X",
2993 cfg[1]);
2a519311 2994 iwe.u.data.length = strlen(buf);
76a70e9c
JM		 2995 current_ev = iwe_stream_add_point_check(info,
2996 current_ev,
2997 end_buf,
2998 &iwe, buf);
2999 if (IS_ERR(current_ev))
3000 goto unlock;
76aa5e70
RP		 3001 sprintf(buf, "Congestion Control Mode ID: 0x%02X",
3002 cfg[2]);
2a519311 3003 iwe.u.data.length = strlen(buf);
76a70e9c
JM		 3004 current_ev = iwe_stream_add_point_check(info,
3005 current_ev,
3006 end_buf,
3007 &iwe, buf);
3008 if (IS_ERR(current_ev))
3009 goto unlock;
76aa5e70 3010 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
2a519311 3011 iwe.u.data.length = strlen(buf);
76a70e9c
JM		 3012 current_ev = iwe_stream_add_point_check(info,
3013 current_ev,
3014 end_buf,
3015 &iwe, buf);
3016 if (IS_ERR(current_ev))
3017 goto unlock;
76aa5e70
RP		 3018 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
3019 iwe.u.data.length = strlen(buf);
76a70e9c
JM		 3020 current_ev = iwe_stream_add_point_check(info,
3021 current_ev,
3022 end_buf,
3023 &iwe, buf);
3024 if (IS_ERR(current_ev))
3025 goto unlock;
76aa5e70
RP		 3026 sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
3027 iwe.u.data.length = strlen(buf);
76a70e9c
JM		 3028 current_ev = iwe_stream_add_point_check(info,
3029 current_ev,
3030 end_buf,
3031 &iwe, buf);
3032 if (IS_ERR(current_ev))
3033 goto unlock;
76aa5e70 3034 sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
2a519311 3035 iwe.u.data.length = strlen(buf);
76a70e9c
JM		 3036 current_ev = iwe_stream_add_point_check(info,
3037 current_ev,
3038 end_buf,
3039 &iwe, buf);
3040 if (IS_ERR(current_ev))
3041 goto unlock;
2a519311
JB		 3042 break;
3043 case WLAN_EID_SUPP_RATES:
3044 case WLAN_EID_EXT_SUPP_RATES:
3045 /* display all supported rates in readable format */
3046 p = current_ev + iwe_stream_lcp_len(info);
3047
3048 memset(&iwe, 0, sizeof(iwe));
3049 iwe.cmd = SIOCGIWRATE;
3050 /* Those two flags are ignored... */
3051 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
3052
3053 for (i = 0; i < ie[1]; i++) {
3054 iwe.u.bitrate.value =
3055 ((ie[i + 2] & 0x7f) * 500000);
76a70e9c 3056 tmp = p;
2a519311 3057 p = iwe_stream_add_value(info, current_ev, p,
76a70e9c
JM		 3058 end_buf, &iwe,
3059 IW_EV_PARAM_LEN);
3060 if (p == tmp) {
3061 current_ev = ERR_PTR(-E2BIG);
3062 goto unlock;
3063 }
2a519311
JB		 3064 }
3065 current_ev = p;
3066 break;
3067 }
3068 rem -= ie[1] + 2;
3069 ie += ie[1] + 2;
3070 }
3071
f64f9e71
JP		 3072 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
3073 ismesh) {
2a519311
JB		 3074 memset(&iwe, 0, sizeof(iwe));
3075 iwe.cmd = SIOCGIWMODE;
3076 if (ismesh)
3077 iwe.u.mode = IW_MODE_MESH;
3078 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
3079 iwe.u.mode = IW_MODE_MASTER;
3080 else
3081 iwe.u.mode = IW_MODE_ADHOC;
76a70e9c
JM		 3082 current_ev = iwe_stream_add_event_check(info, current_ev,
3083 end_buf, &iwe,
3084 IW_EV_UINT_LEN);
3085 if (IS_ERR(current_ev))
3086 goto unlock;
2a519311
JB		 3087 }
3088
76a70e9c
JM		 3089 memset(&iwe, 0, sizeof(iwe));
3090 iwe.cmd = IWEVCUSTOM;
3091 sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf));
3092 iwe.u.data.length = strlen(buf);
3093 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
3094 &iwe, buf);
3095 if (IS_ERR(current_ev))
3096 goto unlock;
3097 memset(&iwe, 0, sizeof(iwe));
3098 iwe.cmd = IWEVCUSTOM;
3099 sprintf(buf, " Last beacon: %ums ago",
3100 elapsed_jiffies_msecs(bss->ts));
3101 iwe.u.data.length = strlen(buf);
3102 current_ev = iwe_stream_add_point_check(info, current_ev,
3103 end_buf, &iwe, buf);
3104 if (IS_ERR(current_ev))
3105 goto unlock;
3106
3107 current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf);
3108
3109 unlock:
9caf0364 3110 rcu_read_unlock();
2a519311
JB		 3111 return current_ev;
3112}
3113
3114
1b8ec87a 3115static int ieee80211_scan_results(struct cfg80211_registered_device *rdev,
2a519311
JB		 3116 struct iw_request_info *info,
3117 char *buf, size_t len)
3118{
3119 char *current_ev = buf;
3120 char *end_buf = buf + len;
3121 struct cfg80211_internal_bss *bss;
76a70e9c 3122 int err = 0;
2a519311 3123
1b8ec87a
ZG		 3124 spin_lock_bh(&rdev->bss_lock);
3125 cfg80211_bss_expire(rdev);
2a519311 3126
1b8ec87a 3127 list_for_each_entry(bss, &rdev->bss_list, list) {
2a519311 3128 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
76a70e9c
JM		 3129 err = -E2BIG;
3130 break;
2a519311 3131 }
1b8ec87a 3132 current_ev = ieee80211_bss(&rdev->wiphy, info, bss,
77965c97 3133 current_ev, end_buf);
76a70e9c
JM		 3134 if (IS_ERR(current_ev)) {
3135 err = PTR_ERR(current_ev);
3136 break;
3137 }
2a519311 3138 }
1b8ec87a 3139 spin_unlock_bh(&rdev->bss_lock);
76a70e9c
JM		 3140
3141 if (err)
3142 return err;
2a519311
JB		 3143 return current_ev - buf;
3144}
3145
3146
3147int cfg80211_wext_giwscan(struct net_device *dev,
3148 struct iw_request_info *info,
3149 struct iw_point *data, char *extra)
3150{
3151 struct cfg80211_registered_device *rdev;
3152 int res;
3153
3154 if (!netif_running(dev))
3155 return -ENETDOWN;
3156
463d0183 3157 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
2a519311
JB		 3158
3159 if (IS_ERR(rdev))
3160 return PTR_ERR(rdev);
3161
f9d15d16 3162 if (rdev->scan_req || rdev->scan_msg)
5fe231e8 3163 return -EAGAIN;
2a519311
JB		 3164
3165 res = ieee80211_scan_results(rdev, info, extra, data->length);
3166 data->length = 0;
3167 if (res >= 0) {
3168 data->length = res;
3169 res = 0;
3170 }
3171
2a519311
JB		 3172 return res;
3173}
2afe38d1 3174EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan);
2a519311 3175#endif
Linux 6.x block layer and io_uring tree(s)