1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * cfg80211 scan result handling
4 *
5 * Copyright 2008 Johannes Berg <johannes@sipsolutions.net>
6 * Copyright 2013-2014 Intel Mobile Communications GmbH
7 * Copyright 2016 Intel Deutschland GmbH
8 * Copyright (C) 2018-2024 Intel Corporation
9 */
10 #include <linux/kernel.h>
11 #include <linux/slab.h>
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>
17 #include <linux/crc32.h>
18 #include <linux/bitfield.h>
19 #include <net/arp.h>
20 #include <net/cfg80211.h>
21 #include <net/cfg80211-wext.h>
22 #include <net/iw_handler.h>
23 #include <kunit/visibility.h>
24 #include "core.h"
25 #include "nl80211.h"
26 #include "wext-compat.h"
27 #include "rdev-ops.h"
28
29 /**
30 * DOC: BSS tree/list structure
31 *
32 * At the top level, the BSS list is kept in both a list in each
33 * registered device (@bss_list) as well as an RB-tree for faster
34 * lookup. In the RB-tree, entries can be looked up using their
35 * channel, MESHID, MESHCONF (for MBSSes) or channel, BSSID, SSID
36 * for other BSSes.
37 *
38 * Due to the possibility of hidden SSIDs, there's a second level
39 * structure, the "hidden_list" and "hidden_beacon_bss" pointer.
40 * The hidden_list connects all BSSes belonging to a single AP
41 * that has a hidden SSID, and connects beacon and probe response
42 * entries. For a probe response entry for a hidden SSID, the
43 * hidden_beacon_bss pointer points to the BSS struct holding the
44 * beacon's information.
45 *
46 * Reference counting is done for all these references except for
47 * the hidden_list, so that a beacon BSS struct that is otherwise
48 * not referenced has one reference for being on the bss_list and
49 * one for each probe response entry that points to it using the
50 * hidden_beacon_bss pointer. When a BSS struct that has such a
51 * pointer is get/put, the refcount update is also propagated to
52 * the referenced struct, this ensure that it cannot get removed
53 * while somebody is using the probe response version.
54 *
55 * Note that the hidden_beacon_bss pointer never changes, due to
56 * the reference counting. Therefore, no locking is needed for
57 * it.
58 *
59 * Also note that the hidden_beacon_bss pointer is only relevant
60 * if the driver uses something other than the IEs, e.g. private
61 * data stored in the BSS struct, since the beacon IEs are
62 * also linked into the probe response struct.
63 */
64
65 /*
66 * Limit the number of BSS entries stored in mac80211. Each one is
67 * a bit over 4k at most, so this limits to roughly 4-5M of memory.
68 * If somebody wants to really attack this though, they'd likely
69 * use small beacons, and only one type of frame, limiting each of
70 * the entries to a much smaller size (in order to generate more
71 * entries in total, so overhead is bigger.)
72 */
73 static int bss_entries_limit = 1000;
74 module_param(bss_entries_limit, int, 0644);
75 MODULE_PARM_DESC(bss_entries_limit,
76 "limit to number of scan BSS entries (per wiphy, default 1000)");
77
78 #define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ)
79
bss_free(struct cfg80211_internal_bss * bss)80 static void bss_free(struct cfg80211_internal_bss *bss)
81 {
82 struct cfg80211_bss_ies *ies;
83
84 if (WARN_ON(atomic_read(&bss->hold)))
85 return;
86
87 ies = (void *)rcu_access_pointer(bss->pub.beacon_ies);
88 if (ies && !bss->pub.hidden_beacon_bss)
89 kfree_rcu(ies, rcu_head);
90 ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies);
91 if (ies)
92 kfree_rcu(ies, rcu_head);
93
94 /*
95 * This happens when the module is removed, it doesn't
96 * really matter any more save for completeness
97 */
98 if (!list_empty(&bss->hidden_list))
99 list_del(&bss->hidden_list);
100
101 kfree(bss);
102 }
103
bss_ref_get(struct cfg80211_registered_device * rdev,struct cfg80211_internal_bss * bss)104 static inline void bss_ref_get(struct cfg80211_registered_device *rdev,
105 struct cfg80211_internal_bss *bss)
106 {
107 lockdep_assert_held(&rdev->bss_lock);
108
109 bss->refcount++;
110
111 if (bss->pub.hidden_beacon_bss)
112 bss_from_pub(bss->pub.hidden_beacon_bss)->refcount++;
113
114 if (bss->pub.transmitted_bss)
115 bss_from_pub(bss->pub.transmitted_bss)->refcount++;
116 }
117
bss_ref_put(struct cfg80211_registered_device * rdev,struct cfg80211_internal_bss * bss)118 static inline void bss_ref_put(struct cfg80211_registered_device *rdev,
119 struct cfg80211_internal_bss *bss)
120 {
121 lockdep_assert_held(&rdev->bss_lock);
122
123 if (bss->pub.hidden_beacon_bss) {
124 struct cfg80211_internal_bss *hbss;
125
126 hbss = bss_from_pub(bss->pub.hidden_beacon_bss);
127 hbss->refcount--;
128 if (hbss->refcount == 0)
129 bss_free(hbss);
130 }
131
132 if (bss->pub.transmitted_bss) {
133 struct cfg80211_internal_bss *tbss;
134
135 tbss = bss_from_pub(bss->pub.transmitted_bss);
136 tbss->refcount--;
137 if (tbss->refcount == 0)
138 bss_free(tbss);
139 }
140
141 bss->refcount--;
142 if (bss->refcount == 0)
143 bss_free(bss);
144 }
145
__cfg80211_unlink_bss(struct cfg80211_registered_device * rdev,struct cfg80211_internal_bss * bss)146 static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev,
147 struct cfg80211_internal_bss *bss)
148 {
149 lockdep_assert_held(&rdev->bss_lock);
150
151 if (!list_empty(&bss->hidden_list)) {
152 /*
153 * don't remove the beacon entry if it has
154 * probe responses associated with it
155 */
156 if (!bss->pub.hidden_beacon_bss)
157 return false;
158 /*
159 * if it's a probe response entry break its
160 * link to the other entries in the group
161 */
162 list_del_init(&bss->hidden_list);
163 }
164
165 list_del_init(&bss->list);
166 list_del_init(&bss->pub.nontrans_list);
167 rb_erase(&bss->rbn, &rdev->bss_tree);
168 rdev->bss_entries--;
169 WARN_ONCE((rdev->bss_entries == 0) ^ list_empty(&rdev->bss_list),
170 "rdev bss entries[%d]/list[empty:%d] corruption\n",
171 rdev->bss_entries, list_empty(&rdev->bss_list));
172 bss_ref_put(rdev, bss);
173 return true;
174 }
175
cfg80211_is_element_inherited(const struct element * elem,const struct element * non_inherit_elem)176 bool cfg80211_is_element_inherited(const struct element *elem,
177 const struct element *non_inherit_elem)
178 {
179 u8 id_len, ext_id_len, i, loop_len, id;
180 const u8 *list;
181
182 if (elem->id == WLAN_EID_MULTIPLE_BSSID)
183 return false;
184
185 if (elem->id == WLAN_EID_EXTENSION && elem->datalen > 1 &&
186 elem->data[0] == WLAN_EID_EXT_EHT_MULTI_LINK)
187 return false;
188
189 if (!non_inherit_elem || non_inherit_elem->datalen < 2)
190 return true;
191
192 /*
193 * non inheritance element format is:
194 * ext ID (56) | IDs list len | list | extension IDs list len | list
195 * Both lists are optional. Both lengths are mandatory.
196 * This means valid length is:
197 * elem_len = 1 (extension ID) + 2 (list len fields) + list lengths
198 */
199 id_len = non_inherit_elem->data[1];
200 if (non_inherit_elem->datalen < 3 + id_len)
201 return true;
202
203 ext_id_len = non_inherit_elem->data[2 + id_len];
204 if (non_inherit_elem->datalen < 3 + id_len + ext_id_len)
205 return true;
206
207 if (elem->id == WLAN_EID_EXTENSION) {
208 if (!ext_id_len)
209 return true;
210 loop_len = ext_id_len;
211 list = &non_inherit_elem->data[3 + id_len];
212 id = elem->data[0];
213 } else {
214 if (!id_len)
215 return true;
216 loop_len = id_len;
217 list = &non_inherit_elem->data[2];
218 id = elem->id;
219 }
220
221 for (i = 0; i < loop_len; i++) {
222 if (list[i] == id)
223 return false;
224 }
225
226 return true;
227 }
228 EXPORT_SYMBOL(cfg80211_is_element_inherited);
229
cfg80211_copy_elem_with_frags(const struct element * elem,const u8 * ie,size_t ie_len,u8 ** pos,u8 * buf,size_t buf_len)230 static size_t cfg80211_copy_elem_with_frags(const struct element *elem,
231 const u8 *ie, size_t ie_len,
232 u8 **pos, u8 *buf, size_t buf_len)
233 {
234 if (WARN_ON((u8 *)elem < ie || elem->data > ie + ie_len ||
235 elem->data + elem->datalen > ie + ie_len))
236 return 0;
237
238 if (elem->datalen + 2 > buf + buf_len - *pos)
239 return 0;
240
241 memcpy(*pos, elem, elem->datalen + 2);
242 *pos += elem->datalen + 2;
243
244 /* Finish if it is not fragmented */
245 if (elem->datalen != 255)
246 return *pos - buf;
247
248 ie_len = ie + ie_len - elem->data - elem->datalen;
249 ie = (const u8 *)elem->data + elem->datalen;
250
251 for_each_element(elem, ie, ie_len) {
252 if (elem->id != WLAN_EID_FRAGMENT)
253 break;
254
255 if (elem->datalen + 2 > buf + buf_len - *pos)
256 return 0;
257
258 memcpy(*pos, elem, elem->datalen + 2);
259 *pos += elem->datalen + 2;
260
261 if (elem->datalen != 255)
262 break;
263 }
264
265 return *pos - buf;
266 }
267
268 VISIBLE_IF_CFG80211_KUNIT size_t
cfg80211_gen_new_ie(const u8 * ie,size_t ielen,const u8 * subie,size_t subie_len,u8 * new_ie,size_t new_ie_len)269 cfg80211_gen_new_ie(const u8 *ie, size_t ielen,
270 const u8 *subie, size_t subie_len,
271 u8 *new_ie, size_t new_ie_len)
272 {
273 const struct element *non_inherit_elem, *parent, *sub;
274 u8 *pos = new_ie;
275 u8 id, ext_id;
276 unsigned int match_len;
277
278 non_inherit_elem = cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE,
279 subie, subie_len);
280
281 /* We copy the elements one by one from the parent to the generated
282 * elements.
283 * If they are not inherited (included in subie or in the non
284 * inheritance element), then we copy all occurrences the first time
285 * we see this element type.
286 */
287 for_each_element(parent, ie, ielen) {
288 if (parent->id == WLAN_EID_FRAGMENT)
289 continue;
290
291 if (parent->id == WLAN_EID_EXTENSION) {
292 if (parent->datalen < 1)
293 continue;
294
295 id = WLAN_EID_EXTENSION;
296 ext_id = parent->data[0];
297 match_len = 1;
298 } else {
299 id = parent->id;
300 match_len = 0;
301 }
302
303 /* Find first occurrence in subie */
304 sub = cfg80211_find_elem_match(id, subie, subie_len,
305 &ext_id, match_len, 0);
306
307 /* Copy from parent if not in subie and inherited */
308 if (!sub &&
309 cfg80211_is_element_inherited(parent, non_inherit_elem)) {
310 if (!cfg80211_copy_elem_with_frags(parent,
311 ie, ielen,
312 &pos, new_ie,
313 new_ie_len))
314 return 0;
315
316 continue;
317 }
318
319 /* Already copied if an earlier element had the same type */
320 if (cfg80211_find_elem_match(id, ie, (u8 *)parent - ie,
321 &ext_id, match_len, 0))
322 continue;
323
324 /* Not inheriting, copy all similar elements from subie */
325 while (sub) {
326 if (!cfg80211_copy_elem_with_frags(sub,
327 subie, subie_len,
328 &pos, new_ie,
329 new_ie_len))
330 return 0;
331
332 sub = cfg80211_find_elem_match(id,
333 sub->data + sub->datalen,
334 subie_len + subie -
335 (sub->data +
336 sub->datalen),
337 &ext_id, match_len, 0);
338 }
339 }
340
341 /* The above misses elements that are included in subie but not in the
342 * parent, so do a pass over subie and append those.
343 * Skip the non-tx BSSID caps and non-inheritance element.
344 */
345 for_each_element(sub, subie, subie_len) {
346 if (sub->id == WLAN_EID_NON_TX_BSSID_CAP)
347 continue;
348
349 if (sub->id == WLAN_EID_FRAGMENT)
350 continue;
351
352 if (sub->id == WLAN_EID_EXTENSION) {
353 if (sub->datalen < 1)
354 continue;
355
356 id = WLAN_EID_EXTENSION;
357 ext_id = sub->data[0];
358 match_len = 1;
359
360 if (ext_id == WLAN_EID_EXT_NON_INHERITANCE)
361 continue;
362 } else {
363 id = sub->id;
364 match_len = 0;
365 }
366
367 /* Processed if one was included in the parent */
368 if (cfg80211_find_elem_match(id, ie, ielen,
369 &ext_id, match_len, 0))
370 continue;
371
372 if (!cfg80211_copy_elem_with_frags(sub, subie, subie_len,
373 &pos, new_ie, new_ie_len))
374 return 0;
375 }
376
377 return pos - new_ie;
378 }
379 EXPORT_SYMBOL_IF_CFG80211_KUNIT(cfg80211_gen_new_ie);
380
is_bss(struct cfg80211_bss * a,const u8 * bssid,const u8 * ssid,size_t ssid_len)381 static bool is_bss(struct cfg80211_bss *a, const u8 *bssid,
382 const u8 *ssid, size_t ssid_len)
383 {
384 const struct cfg80211_bss_ies *ies;
385 const struct element *ssid_elem;
386
387 if (bssid && !ether_addr_equal(a->bssid, bssid))
388 return false;
389
390 if (!ssid)
391 return true;
392
393 ies = rcu_access_pointer(a->ies);
394 if (!ies)
395 return false;
396 ssid_elem = cfg80211_find_elem(WLAN_EID_SSID, ies->data, ies->len);
397 if (!ssid_elem)
398 return false;
399 if (ssid_elem->datalen != ssid_len)
400 return false;
401 return memcmp(ssid_elem->data, ssid, ssid_len) == 0;
402 }
403
404 static int
cfg80211_add_nontrans_list(struct cfg80211_bss * trans_bss,struct cfg80211_bss * nontrans_bss)405 cfg80211_add_nontrans_list(struct cfg80211_bss *trans_bss,
406 struct cfg80211_bss *nontrans_bss)
407 {
408 const struct element *ssid_elem;
409 struct cfg80211_bss *bss = NULL;
410
411 rcu_read_lock();
412 ssid_elem = ieee80211_bss_get_elem(nontrans_bss, WLAN_EID_SSID);
413 if (!ssid_elem) {
414 rcu_read_unlock();
415 return -EINVAL;
416 }
417
418 /* check if nontrans_bss is in the list */
419 list_for_each_entry(bss, &trans_bss->nontrans_list, nontrans_list) {
420 if (is_bss(bss, nontrans_bss->bssid, ssid_elem->data,
421 ssid_elem->datalen)) {
422 rcu_read_unlock();
423 return 0;
424 }
425 }
426
427 rcu_read_unlock();
428
429 /*
430 * This is a bit weird - it's not on the list, but already on another
431 * one! The only way that could happen is if there's some BSSID/SSID
432 * shared by multiple APs in their multi-BSSID profiles, potentially
433 * with hidden SSID mixed in ... ignore it.
434 */
435 if (!list_empty(&nontrans_bss->nontrans_list))
436 return -EINVAL;
437
438 /* add to the list */
439 list_add_tail(&nontrans_bss->nontrans_list, &trans_bss->nontrans_list);
440 return 0;
441 }
442
__cfg80211_bss_expire(struct cfg80211_registered_device * rdev,unsigned long expire_time)443 static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev,
444 unsigned long expire_time)
445 {
446 struct cfg80211_internal_bss *bss, *tmp;
447 bool expired = false;
448
449 lockdep_assert_held(&rdev->bss_lock);
450
451 list_for_each_entry_safe(bss, tmp, &rdev->bss_list, list) {
452 if (atomic_read(&bss->hold))
453 continue;
454 if (!time_after(expire_time, bss->ts))
455 continue;
456
457 if (__cfg80211_unlink_bss(rdev, bss))
458 expired = true;
459 }
460
461 if (expired)
462 rdev->bss_generation++;
463 }
464
cfg80211_bss_expire_oldest(struct cfg80211_registered_device * rdev)465 static bool cfg80211_bss_expire_oldest(struct cfg80211_registered_device *rdev)
466 {
467 struct cfg80211_internal_bss *bss, *oldest = NULL;
468 bool ret;
469
470 lockdep_assert_held(&rdev->bss_lock);
471
472 list_for_each_entry(bss, &rdev->bss_list, list) {
473 if (atomic_read(&bss->hold))
474 continue;
475
476 if (!list_empty(&bss->hidden_list) &&
477 !bss->pub.hidden_beacon_bss)
478 continue;
479
480 if (oldest && time_before(oldest->ts, bss->ts))
481 continue;
482 oldest = bss;
483 }
484
485 if (WARN_ON(!oldest))
486 return false;
487
488 /*
489 * The callers make sure to increase rdev->bss_generation if anything
490 * gets removed (and a new entry added), so there's no need to also do
491 * it here.
492 */
493
494 ret = __cfg80211_unlink_bss(rdev, oldest);
495 WARN_ON(!ret);
496 return ret;
497 }
498
cfg80211_parse_bss_param(u8 data,struct cfg80211_colocated_ap * coloc_ap)499 static u8 cfg80211_parse_bss_param(u8 data,
500 struct cfg80211_colocated_ap *coloc_ap)
501 {
502 coloc_ap->oct_recommended =
503 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_OCT_RECOMMENDED);
504 coloc_ap->same_ssid =
505 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_SAME_SSID);
506 coloc_ap->multi_bss =
507 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_MULTI_BSSID);
508 coloc_ap->transmitted_bssid =
509 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_TRANSMITTED_BSSID);
510 coloc_ap->unsolicited_probe =
511 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_PROBE_ACTIVE);
512 coloc_ap->colocated_ess =
513 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_COLOC_ESS);
514
515 return u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_COLOC_AP);
516 }
517
cfg80211_calc_short_ssid(const struct cfg80211_bss_ies * ies,const struct element ** elem,u32 * s_ssid)518 static int cfg80211_calc_short_ssid(const struct cfg80211_bss_ies *ies,
519 const struct element **elem, u32 *s_ssid)
520 {
521
522 *elem = cfg80211_find_elem(WLAN_EID_SSID, ies->data, ies->len);
523 if (!*elem || (*elem)->datalen > IEEE80211_MAX_SSID_LEN)
524 return -EINVAL;
525
526 *s_ssid = ~crc32_le(~0, (*elem)->data, (*elem)->datalen);
527 return 0;
528 }
529
530 VISIBLE_IF_CFG80211_KUNIT void
cfg80211_free_coloc_ap_list(struct list_head * coloc_ap_list)531 cfg80211_free_coloc_ap_list(struct list_head *coloc_ap_list)
532 {
533 struct cfg80211_colocated_ap *ap, *tmp_ap;
534
535 list_for_each_entry_safe(ap, tmp_ap, coloc_ap_list, list) {
536 list_del(&ap->list);
537 kfree(ap);
538 }
539 }
540 EXPORT_SYMBOL_IF_CFG80211_KUNIT(cfg80211_free_coloc_ap_list);
541
cfg80211_parse_ap_info(struct cfg80211_colocated_ap * entry,const u8 * pos,u8 length,const struct element * ssid_elem,u32 s_ssid_tmp)542 static int cfg80211_parse_ap_info(struct cfg80211_colocated_ap *entry,
543 const u8 *pos, u8 length,
544 const struct element *ssid_elem,
545 u32 s_ssid_tmp)
546 {
547 u8 bss_params;
548
549 entry->psd_20 = IEEE80211_RNR_TBTT_PARAMS_PSD_RESERVED;
550
551 /* The length is already verified by the caller to contain bss_params */
552 if (length > sizeof(struct ieee80211_tbtt_info_7_8_9)) {
553 struct ieee80211_tbtt_info_ge_11 *tbtt_info = (void *)pos;
554
555 memcpy(entry->bssid, tbtt_info->bssid, ETH_ALEN);
556 entry->short_ssid = le32_to_cpu(tbtt_info->short_ssid);
557 entry->short_ssid_valid = true;
558
559 bss_params = tbtt_info->bss_params;
560
561 /* Ignore disabled links */
562 if (length >= offsetofend(typeof(*tbtt_info), mld_params)) {
563 if (le16_get_bits(tbtt_info->mld_params.params,
564 IEEE80211_RNR_MLD_PARAMS_DISABLED_LINK))
565 return -EINVAL;
566 }
567
568 if (length >= offsetofend(struct ieee80211_tbtt_info_ge_11,
569 psd_20))
570 entry->psd_20 = tbtt_info->psd_20;
571 } else {
572 struct ieee80211_tbtt_info_7_8_9 *tbtt_info = (void *)pos;
573
574 memcpy(entry->bssid, tbtt_info->bssid, ETH_ALEN);
575
576 bss_params = tbtt_info->bss_params;
577
578 if (length == offsetofend(struct ieee80211_tbtt_info_7_8_9,
579 psd_20))
580 entry->psd_20 = tbtt_info->psd_20;
581 }
582
583 /* ignore entries with invalid BSSID */
584 if (!is_valid_ether_addr(entry->bssid))
585 return -EINVAL;
586
587 /* skip non colocated APs */
588 if (!cfg80211_parse_bss_param(bss_params, entry))
589 return -EINVAL;
590
591 /* no information about the short ssid. Consider the entry valid
592 * for now. It would later be dropped in case there are explicit
593 * SSIDs that need to be matched
594 */
595 if (!entry->same_ssid && !entry->short_ssid_valid)
596 return 0;
597
598 if (entry->same_ssid) {
599 entry->short_ssid = s_ssid_tmp;
600 entry->short_ssid_valid = true;
601
602 /*
603 * This is safe because we validate datalen in
604 * cfg80211_parse_colocated_ap(), before calling this
605 * function.
606 */
607 memcpy(&entry->ssid, &ssid_elem->data, ssid_elem->datalen);
608 entry->ssid_len = ssid_elem->datalen;
609 }
610
611 return 0;
612 }
613
cfg80211_iter_rnr(const u8 * elems,size_t elems_len,enum cfg80211_rnr_iter_ret (* iter)(void * data,u8 type,const struct ieee80211_neighbor_ap_info * info,const u8 * tbtt_info,u8 tbtt_info_len),void * iter_data)614 bool cfg80211_iter_rnr(const u8 *elems, size_t elems_len,
615 enum cfg80211_rnr_iter_ret
616 (*iter)(void *data, u8 type,
617 const struct ieee80211_neighbor_ap_info *info,
618 const u8 *tbtt_info, u8 tbtt_info_len),
619 void *iter_data)
620 {
621 const struct element *rnr;
622 const u8 *pos, *end;
623
624 for_each_element_id(rnr, WLAN_EID_REDUCED_NEIGHBOR_REPORT,
625 elems, elems_len) {
626 const struct ieee80211_neighbor_ap_info *info;
627
628 pos = rnr->data;
629 end = rnr->data + rnr->datalen;
630
631 /* RNR IE may contain more than one NEIGHBOR_AP_INFO */
632 while (sizeof(*info) <= end - pos) {
633 u8 length, i, count;
634 u8 type;
635
636 info = (void *)pos;
637 count = u8_get_bits(info->tbtt_info_hdr,
638 IEEE80211_AP_INFO_TBTT_HDR_COUNT) +
639 1;
640 length = info->tbtt_info_len;
641
642 pos += sizeof(*info);
643
644 if (count * length > end - pos)
645 return false;
646
647 type = u8_get_bits(info->tbtt_info_hdr,
648 IEEE80211_AP_INFO_TBTT_HDR_TYPE);
649
650 for (i = 0; i < count; i++) {
651 switch (iter(iter_data, type, info,
652 pos, length)) {
653 case RNR_ITER_CONTINUE:
654 break;
655 case RNR_ITER_BREAK:
656 return true;
657 case RNR_ITER_ERROR:
658 return false;
659 }
660
661 pos += length;
662 }
663 }
664
665 if (pos != end)
666 return false;
667 }
668
669 return true;
670 }
671 EXPORT_SYMBOL_GPL(cfg80211_iter_rnr);
672
673 struct colocated_ap_data {
674 const struct element *ssid_elem;
675 struct list_head ap_list;
676 u32 s_ssid_tmp;
677 int n_coloc;
678 };
679
680 static enum cfg80211_rnr_iter_ret
cfg80211_parse_colocated_ap_iter(void * _data,u8 type,const struct ieee80211_neighbor_ap_info * info,const u8 * tbtt_info,u8 tbtt_info_len)681 cfg80211_parse_colocated_ap_iter(void *_data, u8 type,
682 const struct ieee80211_neighbor_ap_info *info,
683 const u8 *tbtt_info, u8 tbtt_info_len)
684 {
685 struct colocated_ap_data *data = _data;
686 struct cfg80211_colocated_ap *entry;
687 enum nl80211_band band;
688
689 if (type != IEEE80211_TBTT_INFO_TYPE_TBTT)
690 return RNR_ITER_CONTINUE;
691
692 if (!ieee80211_operating_class_to_band(info->op_class, &band))
693 return RNR_ITER_CONTINUE;
694
695 /* TBTT info must include bss param + BSSID + (short SSID or
696 * same_ssid bit to be set). Ignore other options, and move to
697 * the next AP info
698 */
699 if (band != NL80211_BAND_6GHZ ||
700 !(tbtt_info_len == offsetofend(struct ieee80211_tbtt_info_7_8_9,
701 bss_params) ||
702 tbtt_info_len == sizeof(struct ieee80211_tbtt_info_7_8_9) ||
703 tbtt_info_len >= offsetofend(struct ieee80211_tbtt_info_ge_11,
704 bss_params)))
705 return RNR_ITER_CONTINUE;
706
707 entry = kzalloc(sizeof(*entry) + IEEE80211_MAX_SSID_LEN, GFP_ATOMIC);
708 if (!entry)
709 return RNR_ITER_ERROR;
710
711 entry->center_freq =
712 ieee80211_channel_to_frequency(info->channel, band);
713
714 if (!cfg80211_parse_ap_info(entry, tbtt_info, tbtt_info_len,
715 data->ssid_elem, data->s_ssid_tmp)) {
716 data->n_coloc++;
717 list_add_tail(&entry->list, &data->ap_list);
718 } else {
719 kfree(entry);
720 }
721
722 return RNR_ITER_CONTINUE;
723 }
724
725 VISIBLE_IF_CFG80211_KUNIT int
cfg80211_parse_colocated_ap(const struct cfg80211_bss_ies * ies,struct list_head * list)726 cfg80211_parse_colocated_ap(const struct cfg80211_bss_ies *ies,
727 struct list_head *list)
728 {
729 struct colocated_ap_data data = {};
730 int ret;
731
732 INIT_LIST_HEAD(&data.ap_list);
733
734 ret = cfg80211_calc_short_ssid(ies, &data.ssid_elem, &data.s_ssid_tmp);
735 if (ret)
736 return 0;
737
738 if (!cfg80211_iter_rnr(ies->data, ies->len,
739 cfg80211_parse_colocated_ap_iter, &data)) {
740 cfg80211_free_coloc_ap_list(&data.ap_list);
741 return 0;
742 }
743
744 list_splice_tail(&data.ap_list, list);
745 return data.n_coloc;
746 }
747 EXPORT_SYMBOL_IF_CFG80211_KUNIT(cfg80211_parse_colocated_ap);
748
cfg80211_scan_req_add_chan(struct cfg80211_scan_request * request,struct ieee80211_channel * chan,bool add_to_6ghz)749 static void cfg80211_scan_req_add_chan(struct cfg80211_scan_request *request,
750 struct ieee80211_channel *chan,
751 bool add_to_6ghz)
752 {
753 int i;
754 u32 n_channels = request->n_channels;
755 struct cfg80211_scan_6ghz_params *params =
756 &request->scan_6ghz_params[request->n_6ghz_params];
757
758 for (i = 0; i < n_channels; i++) {
759 if (request->channels[i] == chan) {
760 if (add_to_6ghz)
761 params->channel_idx = i;
762 return;
763 }
764 }
765
766 request->channels[n_channels] = chan;
767 if (add_to_6ghz)
768 request->scan_6ghz_params[request->n_6ghz_params].channel_idx =
769 n_channels;
770
771 request->n_channels++;
772 }
773
cfg80211_find_ssid_match(struct cfg80211_colocated_ap * ap,struct cfg80211_scan_request * request)774 static bool cfg80211_find_ssid_match(struct cfg80211_colocated_ap *ap,
775 struct cfg80211_scan_request *request)
776 {
777 int i;
778 u32 s_ssid;
779
780 for (i = 0; i < request->n_ssids; i++) {
781 /* wildcard ssid in the scan request */
782 if (!request->ssids[i].ssid_len) {
783 if (ap->multi_bss && !ap->transmitted_bssid)
784 continue;
785
786 return true;
787 }
788
789 if (ap->ssid_len &&
790 ap->ssid_len == request->ssids[i].ssid_len) {
791 if (!memcmp(request->ssids[i].ssid, ap->ssid,
792 ap->ssid_len))
793 return true;
794 } else if (ap->short_ssid_valid) {
795 s_ssid = ~crc32_le(~0, request->ssids[i].ssid,
796 request->ssids[i].ssid_len);
797
798 if (ap->short_ssid == s_ssid)
799 return true;
800 }
801 }
802
803 return false;
804 }
805
cfg80211_scan_6ghz(struct cfg80211_registered_device * rdev)806 static int cfg80211_scan_6ghz(struct cfg80211_registered_device *rdev)
807 {
808 u8 i;
809 struct cfg80211_colocated_ap *ap;
810 int n_channels, count = 0, err;
811 struct cfg80211_scan_request *request, *rdev_req = rdev->scan_req;
812 LIST_HEAD(coloc_ap_list);
813 bool need_scan_psc = true;
814 const struct ieee80211_sband_iftype_data *iftd;
815 size_t size, offs_ssids, offs_6ghz_params, offs_ies;
816
817 rdev_req->scan_6ghz = true;
818
819 if (!rdev->wiphy.bands[NL80211_BAND_6GHZ])
820 return -EOPNOTSUPP;
821
822 iftd = ieee80211_get_sband_iftype_data(rdev->wiphy.bands[NL80211_BAND_6GHZ],
823 rdev_req->wdev->iftype);
824 if (!iftd || !iftd->he_cap.has_he)
825 return -EOPNOTSUPP;
826
827 n_channels = rdev->wiphy.bands[NL80211_BAND_6GHZ]->n_channels;
828
829 if (rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ) {
830 struct cfg80211_internal_bss *intbss;
831
832 spin_lock_bh(&rdev->bss_lock);
833 list_for_each_entry(intbss, &rdev->bss_list, list) {
834 struct cfg80211_bss *res = &intbss->pub;
835 const struct cfg80211_bss_ies *ies;
836 const struct element *ssid_elem;
837 struct cfg80211_colocated_ap *entry;
838 u32 s_ssid_tmp;
839 int ret;
840
841 ies = rcu_access_pointer(res->ies);
842 count += cfg80211_parse_colocated_ap(ies,
843 &coloc_ap_list);
844
845 /* In case the scan request specified a specific BSSID
846 * and the BSS is found and operating on 6GHz band then
847 * add this AP to the collocated APs list.
848 * This is relevant for ML probe requests when the lower
849 * band APs have not been discovered.
850 */
851 if (is_broadcast_ether_addr(rdev_req->bssid) ||
852 !ether_addr_equal(rdev_req->bssid, res->bssid) ||
853 res->channel->band != NL80211_BAND_6GHZ)
854 continue;
855
856 ret = cfg80211_calc_short_ssid(ies, &ssid_elem,
857 &s_ssid_tmp);
858 if (ret)
859 continue;
860
861 entry = kzalloc(sizeof(*entry) + IEEE80211_MAX_SSID_LEN,
862 GFP_ATOMIC);
863
864 if (!entry)
865 continue;
866
867 memcpy(entry->bssid, res->bssid, ETH_ALEN);
868 entry->short_ssid = s_ssid_tmp;
869 memcpy(entry->ssid, ssid_elem->data,
870 ssid_elem->datalen);
871 entry->ssid_len = ssid_elem->datalen;
872 entry->short_ssid_valid = true;
873 entry->center_freq = res->channel->center_freq;
874
875 list_add_tail(&entry->list, &coloc_ap_list);
876 count++;
877 }
878 spin_unlock_bh(&rdev->bss_lock);
879 }
880
881 size = struct_size(request, channels, n_channels);
882 offs_ssids = size;
883 size += sizeof(*request->ssids) * rdev_req->n_ssids;
884 offs_6ghz_params = size;
885 size += sizeof(*request->scan_6ghz_params) * count;
886 offs_ies = size;
887 size += rdev_req->ie_len;
888
889 request = kzalloc(size, GFP_KERNEL);
890 if (!request) {
891 cfg80211_free_coloc_ap_list(&coloc_ap_list);
892 return -ENOMEM;
893 }
894
895 *request = *rdev_req;
896 request->n_channels = 0;
897 request->n_6ghz_params = 0;
898 if (rdev_req->n_ssids) {
899 /*
900 * Add the ssids from the parent scan request to the new
901 * scan request, so the driver would be able to use them
902 * in its probe requests to discover hidden APs on PSC
903 * channels.
904 */
905 request->ssids = (void *)request + offs_ssids;
906 memcpy(request->ssids, rdev_req->ssids,
907 sizeof(*request->ssids) * request->n_ssids);
908 }
909 request->scan_6ghz_params = (void *)request + offs_6ghz_params;
910
911 if (rdev_req->ie_len) {
912 void *ie = (void *)request + offs_ies;
913
914 memcpy(ie, rdev_req->ie, rdev_req->ie_len);
915 request->ie = ie;
916 }
917
918 /*
919 * PSC channels should not be scanned in case of direct scan with 1 SSID
920 * and at least one of the reported co-located APs with same SSID
921 * indicating that all APs in the same ESS are co-located
922 */
923 if (count && request->n_ssids == 1 && request->ssids[0].ssid_len) {
924 list_for_each_entry(ap, &coloc_ap_list, list) {
925 if (ap->colocated_ess &&
926 cfg80211_find_ssid_match(ap, request)) {
927 need_scan_psc = false;
928 break;
929 }
930 }
931 }
932
933 /*
934 * add to the scan request the channels that need to be scanned
935 * regardless of the collocated APs (PSC channels or all channels
936 * in case that NL80211_SCAN_FLAG_COLOCATED_6GHZ is not set)
937 */
938 for (i = 0; i < rdev_req->n_channels; i++) {
939 if (rdev_req->channels[i]->band == NL80211_BAND_6GHZ &&
940 ((need_scan_psc &&
941 cfg80211_channel_is_psc(rdev_req->channels[i])) ||
942 !(rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ))) {
943 cfg80211_scan_req_add_chan(request,
944 rdev_req->channels[i],
945 false);
946 }
947 }
948
949 if (!(rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ))
950 goto skip;
951
952 list_for_each_entry(ap, &coloc_ap_list, list) {
953 bool found = false;
954 struct cfg80211_scan_6ghz_params *scan_6ghz_params =
955 &request->scan_6ghz_params[request->n_6ghz_params];
956 struct ieee80211_channel *chan =
957 ieee80211_get_channel(&rdev->wiphy, ap->center_freq);
958
959 if (!chan || chan->flags & IEEE80211_CHAN_DISABLED)
960 continue;
961
962 for (i = 0; i < rdev_req->n_channels; i++) {
963 if (rdev_req->channels[i] == chan)
964 found = true;
965 }
966
967 if (!found)
968 continue;
969
970 if (request->n_ssids > 0 &&
971 !cfg80211_find_ssid_match(ap, request))
972 continue;
973
974 if (!is_broadcast_ether_addr(request->bssid) &&
975 !ether_addr_equal(request->bssid, ap->bssid))
976 continue;
977
978 if (!request->n_ssids && ap->multi_bss && !ap->transmitted_bssid)
979 continue;
980
981 cfg80211_scan_req_add_chan(request, chan, true);
982 memcpy(scan_6ghz_params->bssid, ap->bssid, ETH_ALEN);
983 scan_6ghz_params->short_ssid = ap->short_ssid;
984 scan_6ghz_params->short_ssid_valid = ap->short_ssid_valid;
985 scan_6ghz_params->unsolicited_probe = ap->unsolicited_probe;
986 scan_6ghz_params->psd_20 = ap->psd_20;
987
988 /*
989 * If a PSC channel is added to the scan and 'need_scan_psc' is
990 * set to false, then all the APs that the scan logic is
991 * interested with on the channel are collocated and thus there
992 * is no need to perform the initial PSC channel listen.
993 */
994 if (cfg80211_channel_is_psc(chan) && !need_scan_psc)
995 scan_6ghz_params->psc_no_listen = true;
996
997 request->n_6ghz_params++;
998 }
999
1000 skip:
1001 cfg80211_free_coloc_ap_list(&coloc_ap_list);
1002
1003 if (request->n_channels) {
1004 struct cfg80211_scan_request *old = rdev->int_scan_req;
1005
1006 rdev->int_scan_req = request;
1007
1008 /*
1009 * If this scan follows a previous scan, save the scan start
1010 * info from the first part of the scan
1011 */
1012 if (old)
1013 rdev->int_scan_req->info = old->info;
1014
1015 err = rdev_scan(rdev, request);
1016 if (err) {
1017 rdev->int_scan_req = old;
1018 kfree(request);
1019 } else {
1020 kfree(old);
1021 }
1022
1023 return err;
1024 }
1025
1026 kfree(request);
1027 return -EINVAL;
1028 }
1029
cfg80211_scan(struct cfg80211_registered_device * rdev)1030 int cfg80211_scan(struct cfg80211_registered_device *rdev)
1031 {
1032 struct cfg80211_scan_request *request;
1033 struct cfg80211_scan_request *rdev_req = rdev->scan_req;
1034 u32 n_channels = 0, idx, i;
1035
1036 if (!(rdev->wiphy.flags & WIPHY_FLAG_SPLIT_SCAN_6GHZ))
1037 return rdev_scan(rdev, rdev_req);
1038
1039 for (i = 0; i < rdev_req->n_channels; i++) {
1040 if (rdev_req->channels[i]->band != NL80211_BAND_6GHZ)
1041 n_channels++;
1042 }
1043
1044 if (!n_channels)
1045 return cfg80211_scan_6ghz(rdev);
1046
1047 request = kzalloc(struct_size(request, channels, n_channels),
1048 GFP_KERNEL);
1049 if (!request)
1050 return -ENOMEM;
1051
1052 *request = *rdev_req;
1053 request->n_channels = n_channels;
1054
1055 for (i = idx = 0; i < rdev_req->n_channels; i++) {
1056 if (rdev_req->channels[i]->band != NL80211_BAND_6GHZ)
1057 request->channels[idx++] = rdev_req->channels[i];
1058 }
1059
1060 rdev_req->scan_6ghz = false;
1061 rdev->int_scan_req = request;
1062 return rdev_scan(rdev, request);
1063 }
1064
___cfg80211_scan_done(struct cfg80211_registered_device * rdev,bool send_message)1065 void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev,
1066 bool send_message)
1067 {
1068 struct cfg80211_scan_request *request, *rdev_req;
1069 struct wireless_dev *wdev;
1070 struct sk_buff *msg;
1071 #ifdef CONFIG_CFG80211_WEXT
1072 union iwreq_data wrqu;
1073 #endif
1074
1075 lockdep_assert_held(&rdev->wiphy.mtx);
1076
1077 if (rdev->scan_msg) {
1078 nl80211_send_scan_msg(rdev, rdev->scan_msg);
1079 rdev->scan_msg = NULL;
1080 return;
1081 }
1082
1083 rdev_req = rdev->scan_req;
1084 if (!rdev_req)
1085 return;
1086
1087 wdev = rdev_req->wdev;
1088 request = rdev->int_scan_req ? rdev->int_scan_req : rdev_req;
1089
1090 if (wdev_running(wdev) &&
1091 (rdev->wiphy.flags & WIPHY_FLAG_SPLIT_SCAN_6GHZ) &&
1092 !rdev_req->scan_6ghz && !request->info.aborted &&
1093 !cfg80211_scan_6ghz(rdev))
1094 return;
1095
1096 /*
1097 * This must be before sending the other events!
1098 * Otherwise, wpa_supplicant gets completely confused with
1099 * wext events.
1100 */
1101 if (wdev->netdev)
1102 cfg80211_sme_scan_done(wdev->netdev);
1103
1104 if (!request->info.aborted &&
1105 request->flags & NL80211_SCAN_FLAG_FLUSH) {
1106 /* flush entries from previous scans */
1107 spin_lock_bh(&rdev->bss_lock);
1108 __cfg80211_bss_expire(rdev, request->scan_start);
1109 spin_unlock_bh(&rdev->bss_lock);
1110 }
1111
1112 msg = nl80211_build_scan_msg(rdev, wdev, request->info.aborted);
1113
1114 #ifdef CONFIG_CFG80211_WEXT
1115 if (wdev->netdev && !request->info.aborted) {
1116 memset(&wrqu, 0, sizeof(wrqu));
1117
1118 wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL);
1119 }
1120 #endif
1121
1122 dev_put(wdev->netdev);
1123
1124 kfree(rdev->int_scan_req);
1125 rdev->int_scan_req = NULL;
1126
1127 kfree(rdev->scan_req);
1128 rdev->scan_req = NULL;
1129
1130 if (!send_message)
1131 rdev->scan_msg = msg;
1132 else
1133 nl80211_send_scan_msg(rdev, msg);
1134 }
1135
__cfg80211_scan_done(struct wiphy * wiphy,struct wiphy_work * wk)1136 void __cfg80211_scan_done(struct wiphy *wiphy, struct wiphy_work *wk)
1137 {
1138 ___cfg80211_scan_done(wiphy_to_rdev(wiphy), true);
1139 }
1140
cfg80211_scan_done(struct cfg80211_scan_request * request,struct cfg80211_scan_info * info)1141 void cfg80211_scan_done(struct cfg80211_scan_request *request,
1142 struct cfg80211_scan_info *info)
1143 {
1144 struct cfg80211_scan_info old_info = request->info;
1145
1146 trace_cfg80211_scan_done(request, info);
1147 WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req &&
1148 request != wiphy_to_rdev(request->wiphy)->int_scan_req);
1149
1150 request->info = *info;
1151
1152 /*
1153 * In case the scan is split, the scan_start_tsf and tsf_bssid should
1154 * be of the first part. In such a case old_info.scan_start_tsf should
1155 * be non zero.
1156 */
1157 if (request->scan_6ghz && old_info.scan_start_tsf) {
1158 request->info.scan_start_tsf = old_info.scan_start_tsf;
1159 memcpy(request->info.tsf_bssid, old_info.tsf_bssid,
1160 sizeof(request->info.tsf_bssid));
1161 }
1162
1163 request->notified = true;
1164 wiphy_work_queue(request->wiphy,
1165 &wiphy_to_rdev(request->wiphy)->scan_done_wk);
1166 }
1167 EXPORT_SYMBOL(cfg80211_scan_done);
1168
cfg80211_add_sched_scan_req(struct cfg80211_registered_device * rdev,struct cfg80211_sched_scan_request * req)1169 void cfg80211_add_sched_scan_req(struct cfg80211_registered_device *rdev,
1170 struct cfg80211_sched_scan_request *req)
1171 {
1172 lockdep_assert_held(&rdev->wiphy.mtx);
1173
1174 list_add_rcu(&req->list, &rdev->sched_scan_req_list);
1175 }
1176
cfg80211_del_sched_scan_req(struct cfg80211_registered_device * rdev,struct cfg80211_sched_scan_request * req)1177 static void cfg80211_del_sched_scan_req(struct cfg80211_registered_device *rdev,
1178 struct cfg80211_sched_scan_request *req)
1179 {
1180 lockdep_assert_held(&rdev->wiphy.mtx);
1181
1182 list_del_rcu(&req->list);
1183 kfree_rcu(req, rcu_head);
1184 }
1185
1186 static struct cfg80211_sched_scan_request *
cfg80211_find_sched_scan_req(struct cfg80211_registered_device * rdev,u64 reqid)1187 cfg80211_find_sched_scan_req(struct cfg80211_registered_device *rdev, u64 reqid)
1188 {
1189 struct cfg80211_sched_scan_request *pos;
1190
1191 list_for_each_entry_rcu(pos, &rdev->sched_scan_req_list, list,
1192 lockdep_is_held(&rdev->wiphy.mtx)) {
1193 if (pos->reqid == reqid)
1194 return pos;
1195 }
1196 return NULL;
1197 }
1198
1199 /*
1200 * Determines if a scheduled scan request can be handled. When a legacy
1201 * scheduled scan is running no other scheduled scan is allowed regardless
1202 * whether the request is for legacy or multi-support scan. When a multi-support
1203 * scheduled scan is running a request for legacy scan is not allowed. In this
1204 * case a request for multi-support scan can be handled if resources are
1205 * available, ie. struct wiphy::max_sched_scan_reqs limit is not yet reached.
1206 */
cfg80211_sched_scan_req_possible(struct cfg80211_registered_device * rdev,bool want_multi)1207 int cfg80211_sched_scan_req_possible(struct cfg80211_registered_device *rdev,
1208 bool want_multi)
1209 {
1210 struct cfg80211_sched_scan_request *pos;
1211 int i = 0;
1212
1213 list_for_each_entry(pos, &rdev->sched_scan_req_list, list) {
1214 /* request id zero means legacy in progress */
1215 if (!i && !pos->reqid)
1216 return -EINPROGRESS;
1217 i++;
1218 }
1219
1220 if (i) {
1221 /* no legacy allowed when multi request(s) are active */
1222 if (!want_multi)
1223 return -EINPROGRESS;
1224
1225 /* resource limit reached */
1226 if (i == rdev->wiphy.max_sched_scan_reqs)
1227 return -ENOSPC;
1228 }
1229 return 0;
1230 }
1231
cfg80211_sched_scan_results_wk(struct work_struct * work)1232 void cfg80211_sched_scan_results_wk(struct work_struct *work)
1233 {
1234 struct cfg80211_registered_device *rdev;
1235 struct cfg80211_sched_scan_request *req, *tmp;
1236
1237 rdev = container_of(work, struct cfg80211_registered_device,
1238 sched_scan_res_wk);
1239
1240 wiphy_lock(&rdev->wiphy);
1241 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
1242 if (req->report_results) {
1243 req->report_results = false;
1244 if (req->flags & NL80211_SCAN_FLAG_FLUSH) {
1245 /* flush entries from previous scans */
1246 spin_lock_bh(&rdev->bss_lock);
1247 __cfg80211_bss_expire(rdev, req->scan_start);
1248 spin_unlock_bh(&rdev->bss_lock);
1249 req->scan_start = jiffies;
1250 }
1251 nl80211_send_sched_scan(req,
1252 NL80211_CMD_SCHED_SCAN_RESULTS);
1253 }
1254 }
1255 wiphy_unlock(&rdev->wiphy);
1256 }
1257
cfg80211_sched_scan_results(struct wiphy * wiphy,u64 reqid)1258 void cfg80211_sched_scan_results(struct wiphy *wiphy, u64 reqid)
1259 {
1260 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1261 struct cfg80211_sched_scan_request *request;
1262
1263 trace_cfg80211_sched_scan_results(wiphy, reqid);
1264 /* ignore if we're not scanning */
1265
1266 rcu_read_lock();
1267 request = cfg80211_find_sched_scan_req(rdev, reqid);
1268 if (request) {
1269 request->report_results = true;
1270 queue_work(cfg80211_wq, &rdev->sched_scan_res_wk);
1271 }
1272 rcu_read_unlock();
1273 }
1274 EXPORT_SYMBOL(cfg80211_sched_scan_results);
1275
cfg80211_sched_scan_stopped_locked(struct wiphy * wiphy,u64 reqid)1276 void cfg80211_sched_scan_stopped_locked(struct wiphy *wiphy, u64 reqid)
1277 {
1278 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1279
1280 lockdep_assert_held(&wiphy->mtx);
1281
1282 trace_cfg80211_sched_scan_stopped(wiphy, reqid);
1283
1284 __cfg80211_stop_sched_scan(rdev, reqid, true);
1285 }
1286 EXPORT_SYMBOL(cfg80211_sched_scan_stopped_locked);
1287
cfg80211_sched_scan_stopped(struct wiphy * wiphy,u64 reqid)1288 void cfg80211_sched_scan_stopped(struct wiphy *wiphy, u64 reqid)
1289 {
1290 wiphy_lock(wiphy);
1291 cfg80211_sched_scan_stopped_locked(wiphy, reqid);
1292 wiphy_unlock(wiphy);
1293 }
1294 EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
1295
cfg80211_stop_sched_scan_req(struct cfg80211_registered_device * rdev,struct cfg80211_sched_scan_request * req,bool driver_initiated)1296 int cfg80211_stop_sched_scan_req(struct cfg80211_registered_device *rdev,
1297 struct cfg80211_sched_scan_request *req,
1298 bool driver_initiated)
1299 {
1300 lockdep_assert_held(&rdev->wiphy.mtx);
1301
1302 if (!driver_initiated) {
1303 int err = rdev_sched_scan_stop(rdev, req->dev, req->reqid);
1304 if (err)
1305 return err;
1306 }
1307
1308 nl80211_send_sched_scan(req, NL80211_CMD_SCHED_SCAN_STOPPED);
1309
1310 cfg80211_del_sched_scan_req(rdev, req);
1311
1312 return 0;
1313 }
1314
__cfg80211_stop_sched_scan(struct cfg80211_registered_device * rdev,u64 reqid,bool driver_initiated)1315 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
1316 u64 reqid, bool driver_initiated)
1317 {
1318 struct cfg80211_sched_scan_request *sched_scan_req;
1319
1320 lockdep_assert_held(&rdev->wiphy.mtx);
1321
1322 sched_scan_req = cfg80211_find_sched_scan_req(rdev, reqid);
1323 if (!sched_scan_req)
1324 return -ENOENT;
1325
1326 return cfg80211_stop_sched_scan_req(rdev, sched_scan_req,
1327 driver_initiated);
1328 }
1329
cfg80211_bss_age(struct cfg80211_registered_device * rdev,unsigned long age_secs)1330 void cfg80211_bss_age(struct cfg80211_registered_device *rdev,
1331 unsigned long age_secs)
1332 {
1333 struct cfg80211_internal_bss *bss;
1334 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
1335
1336 spin_lock_bh(&rdev->bss_lock);
1337 list_for_each_entry(bss, &rdev->bss_list, list)
1338 bss->ts -= age_jiffies;
1339 spin_unlock_bh(&rdev->bss_lock);
1340 }
1341
cfg80211_bss_expire(struct cfg80211_registered_device * rdev)1342 void cfg80211_bss_expire(struct cfg80211_registered_device *rdev)
1343 {
1344 __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE);
1345 }
1346
cfg80211_bss_flush(struct wiphy * wiphy)1347 void cfg80211_bss_flush(struct wiphy *wiphy)
1348 {
1349 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1350
1351 spin_lock_bh(&rdev->bss_lock);
1352 __cfg80211_bss_expire(rdev, jiffies);
1353 spin_unlock_bh(&rdev->bss_lock);
1354 }
1355 EXPORT_SYMBOL(cfg80211_bss_flush);
1356
1357 const struct element *
cfg80211_find_elem_match(u8 eid,const u8 * ies,unsigned int len,const u8 * match,unsigned int match_len,unsigned int match_offset)1358 cfg80211_find_elem_match(u8 eid, const u8 *ies, unsigned int len,
1359 const u8 *match, unsigned int match_len,
1360 unsigned int match_offset)
1361 {
1362 const struct element *elem;
1363
1364 for_each_element_id(elem, eid, ies, len) {
1365 if (elem->datalen >= match_offset + match_len &&
1366 !memcmp(elem->data + match_offset, match, match_len))
1367 return elem;
1368 }
1369
1370 return NULL;
1371 }
1372 EXPORT_SYMBOL(cfg80211_find_elem_match);
1373
cfg80211_find_vendor_elem(unsigned int oui,int oui_type,const u8 * ies,unsigned int len)1374 const struct element *cfg80211_find_vendor_elem(unsigned int oui, int oui_type,
1375 const u8 *ies,
1376 unsigned int len)
1377 {
1378 const struct element *elem;
1379 u8 match[] = { oui >> 16, oui >> 8, oui, oui_type };
1380 int match_len = (oui_type < 0) ? 3 : sizeof(match);
1381
1382 if (WARN_ON(oui_type > 0xff))
1383 return NULL;
1384
1385 elem = cfg80211_find_elem_match(WLAN_EID_VENDOR_SPECIFIC, ies, len,
1386 match, match_len, 0);
1387
1388 if (!elem || elem->datalen < 4)
1389 return NULL;
1390
1391 return elem;
1392 }
1393 EXPORT_SYMBOL(cfg80211_find_vendor_elem);
1394
1395 /**
1396 * enum bss_compare_mode - BSS compare mode
1397 * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find)
1398 * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode
1399 * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode
1400 */
1401 enum bss_compare_mode {
1402 BSS_CMP_REGULAR,
1403 BSS_CMP_HIDE_ZLEN,
1404 BSS_CMP_HIDE_NUL,
1405 };
1406
cmp_bss(struct cfg80211_bss * a,struct cfg80211_bss * b,enum bss_compare_mode mode)1407 static int cmp_bss(struct cfg80211_bss *a,
1408 struct cfg80211_bss *b,
1409 enum bss_compare_mode mode)
1410 {
1411 const struct cfg80211_bss_ies *a_ies, *b_ies;
1412 const u8 *ie1 = NULL;
1413 const u8 *ie2 = NULL;
1414 int i, r;
1415
1416 if (a->channel != b->channel)
1417 return (b->channel->center_freq * 1000 + b->channel->freq_offset) -
1418 (a->channel->center_freq * 1000 + a->channel->freq_offset);
1419
1420 a_ies = rcu_access_pointer(a->ies);
1421 if (!a_ies)
1422 return -1;
1423 b_ies = rcu_access_pointer(b->ies);
1424 if (!b_ies)
1425 return 1;
1426
1427 if (WLAN_CAPABILITY_IS_STA_BSS(a->capability))
1428 ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID,
1429 a_ies->data, a_ies->len);
1430 if (WLAN_CAPABILITY_IS_STA_BSS(b->capability))
1431 ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID,
1432 b_ies->data, b_ies->len);
1433 if (ie1 && ie2) {
1434 int mesh_id_cmp;
1435
1436 if (ie1[1] == ie2[1])
1437 mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]);
1438 else
1439 mesh_id_cmp = ie2[1] - ie1[1];
1440
1441 ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
1442 a_ies->data, a_ies->len);
1443 ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
1444 b_ies->data, b_ies->len);
1445 if (ie1 && ie2) {
1446 if (mesh_id_cmp)
1447 return mesh_id_cmp;
1448 if (ie1[1] != ie2[1])
1449 return ie2[1] - ie1[1];
1450 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
1451 }
1452 }
1453
1454 r = memcmp(a->bssid, b->bssid, sizeof(a->bssid));
1455 if (r)
1456 return r;
1457
1458 ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len);
1459 ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len);
1460
1461 if (!ie1 && !ie2)
1462 return 0;
1463
1464 /*
1465 * Note that with "hide_ssid", the function returns a match if
1466 * the already-present BSS ("b") is a hidden SSID beacon for
1467 * the new BSS ("a").
1468 */
1469
1470 /* sort missing IE before (left of) present IE */
1471 if (!ie1)
1472 return -1;
1473 if (!ie2)
1474 return 1;
1475
1476 switch (mode) {
1477 case BSS_CMP_HIDE_ZLEN:
1478 /*
1479 * In ZLEN mode we assume the BSS entry we're
1480 * looking for has a zero-length SSID. So if
1481 * the one we're looking at right now has that,
1482 * return 0. Otherwise, return the difference
1483 * in length, but since we're looking for the
1484 * 0-length it's really equivalent to returning
1485 * the length of the one we're looking at.
1486 *
1487 * No content comparison is needed as we assume
1488 * the content length is zero.
1489 */
1490 return ie2[1];
1491 case BSS_CMP_REGULAR:
1492 default:
1493 /* sort by length first, then by contents */
1494 if (ie1[1] != ie2[1])
1495 return ie2[1] - ie1[1];
1496 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
1497 case BSS_CMP_HIDE_NUL:
1498 if (ie1[1] != ie2[1])
1499 return ie2[1] - ie1[1];
1500 /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */
1501 for (i = 0; i < ie2[1]; i++)
1502 if (ie2[i + 2])
1503 return -1;
1504 return 0;
1505 }
1506 }
1507
cfg80211_bss_type_match(u16 capability,enum nl80211_band band,enum ieee80211_bss_type bss_type)1508 static bool cfg80211_bss_type_match(u16 capability,
1509 enum nl80211_band band,
1510 enum ieee80211_bss_type bss_type)
1511 {
1512 bool ret = true;
1513 u16 mask, val;
1514
1515 if (bss_type == IEEE80211_BSS_TYPE_ANY)
1516 return ret;
1517
1518 if (band == NL80211_BAND_60GHZ) {
1519 mask = WLAN_CAPABILITY_DMG_TYPE_MASK;
1520 switch (bss_type) {
1521 case IEEE80211_BSS_TYPE_ESS:
1522 val = WLAN_CAPABILITY_DMG_TYPE_AP;
1523 break;
1524 case IEEE80211_BSS_TYPE_PBSS:
1525 val = WLAN_CAPABILITY_DMG_TYPE_PBSS;
1526 break;
1527 case IEEE80211_BSS_TYPE_IBSS:
1528 val = WLAN_CAPABILITY_DMG_TYPE_IBSS;
1529 break;
1530 default:
1531 return false;
1532 }
1533 } else {
1534 mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS;
1535 switch (bss_type) {
1536 case IEEE80211_BSS_TYPE_ESS:
1537 val = WLAN_CAPABILITY_ESS;
1538 break;
1539 case IEEE80211_BSS_TYPE_IBSS:
1540 val = WLAN_CAPABILITY_IBSS;
1541 break;
1542 case IEEE80211_BSS_TYPE_MBSS:
1543 val = 0;
1544 break;
1545 default:
1546 return false;
1547 }
1548 }
1549
1550 ret = ((capability & mask) == val);
1551 return ret;
1552 }
1553
1554 /* Returned bss is reference counted and must be cleaned up appropriately. */
__cfg80211_get_bss(struct wiphy * wiphy,struct ieee80211_channel * channel,const u8 * bssid,const u8 * ssid,size_t ssid_len,enum ieee80211_bss_type bss_type,enum ieee80211_privacy privacy,u32 use_for)1555 struct cfg80211_bss *__cfg80211_get_bss(struct wiphy *wiphy,
1556 struct ieee80211_channel *channel,
1557 const u8 *bssid,
1558 const u8 *ssid, size_t ssid_len,
1559 enum ieee80211_bss_type bss_type,
1560 enum ieee80211_privacy privacy,
1561 u32 use_for)
1562 {
1563 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1564 struct cfg80211_internal_bss *bss, *res = NULL;
1565 unsigned long now = jiffies;
1566 int bss_privacy;
1567
1568 trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type,
1569 privacy);
1570
1571 spin_lock_bh(&rdev->bss_lock);
1572
1573 list_for_each_entry(bss, &rdev->bss_list, list) {
1574 if (!cfg80211_bss_type_match(bss->pub.capability,
1575 bss->pub.channel->band, bss_type))
1576 continue;
1577
1578 bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY);
1579 if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) ||
1580 (privacy == IEEE80211_PRIVACY_OFF && bss_privacy))
1581 continue;
1582 if (channel && bss->pub.channel != channel)
1583 continue;
1584 if (!is_valid_ether_addr(bss->pub.bssid))
1585 continue;
1586 if ((bss->pub.use_for & use_for) != use_for)
1587 continue;
1588 /* Don't get expired BSS structs */
1589 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
1590 !atomic_read(&bss->hold))
1591 continue;
1592 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
1593 res = bss;
1594 bss_ref_get(rdev, res);
1595 break;
1596 }
1597 }
1598
1599 spin_unlock_bh(&rdev->bss_lock);
1600 if (!res)
1601 return NULL;
1602 trace_cfg80211_return_bss(&res->pub);
1603 return &res->pub;
1604 }
1605 EXPORT_SYMBOL(__cfg80211_get_bss);
1606
rb_insert_bss(struct cfg80211_registered_device * rdev,struct cfg80211_internal_bss * bss)1607 static void rb_insert_bss(struct cfg80211_registered_device *rdev,
1608 struct cfg80211_internal_bss *bss)
1609 {
1610 struct rb_node **p = &rdev->bss_tree.rb_node;
1611 struct rb_node *parent = NULL;
1612 struct cfg80211_internal_bss *tbss;
1613 int cmp;
1614
1615 while (*p) {
1616 parent = *p;
1617 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
1618
1619 cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR);
1620
1621 if (WARN_ON(!cmp)) {
1622 /* will sort of leak this BSS */
1623 return;
1624 }
1625
1626 if (cmp < 0)
1627 p = &(*p)->rb_left;
1628 else
1629 p = &(*p)->rb_right;
1630 }
1631
1632 rb_link_node(&bss->rbn, parent, p);
1633 rb_insert_color(&bss->rbn, &rdev->bss_tree);
1634 }
1635
1636 static struct cfg80211_internal_bss *
rb_find_bss(struct cfg80211_registered_device * rdev,struct cfg80211_internal_bss * res,enum bss_compare_mode mode)1637 rb_find_bss(struct cfg80211_registered_device *rdev,
1638 struct cfg80211_internal_bss *res,
1639 enum bss_compare_mode mode)
1640 {
1641 struct rb_node *n = rdev->bss_tree.rb_node;
1642 struct cfg80211_internal_bss *bss;
1643 int r;
1644
1645 while (n) {
1646 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
1647 r = cmp_bss(&res->pub, &bss->pub, mode);
1648
1649 if (r == 0)
1650 return bss;
1651 else if (r < 0)
1652 n = n->rb_left;
1653 else
1654 n = n->rb_right;
1655 }
1656
1657 return NULL;
1658 }
1659
cfg80211_combine_bsses(struct cfg80211_registered_device * rdev,struct cfg80211_internal_bss * new)1660 static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev,
1661 struct cfg80211_internal_bss *new)
1662 {
1663 const struct cfg80211_bss_ies *ies;
1664 struct cfg80211_internal_bss *bss;
1665 const u8 *ie;
1666 int i, ssidlen;
1667 u8 fold = 0;
1668 u32 n_entries = 0;
1669
1670 ies = rcu_access_pointer(new->pub.beacon_ies);
1671 if (WARN_ON(!ies))
1672 return false;
1673
1674 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
1675 if (!ie) {
1676 /* nothing to do */
1677 return true;
1678 }
1679
1680 ssidlen = ie[1];
1681 for (i = 0; i < ssidlen; i++)
1682 fold |= ie[2 + i];
1683
1684 if (fold) {
1685 /* not a hidden SSID */
1686 return true;
1687 }
1688
1689 /* This is the bad part ... */
1690
1691 list_for_each_entry(bss, &rdev->bss_list, list) {
1692 /*
1693 * we're iterating all the entries anyway, so take the
1694 * opportunity to validate the list length accounting
1695 */
1696 n_entries++;
1697
1698 if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid))
1699 continue;
1700 if (bss->pub.channel != new->pub.channel)
1701 continue;
1702 if (rcu_access_pointer(bss->pub.beacon_ies))
1703 continue;
1704 ies = rcu_access_pointer(bss->pub.ies);
1705 if (!ies)
1706 continue;
1707 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
1708 if (!ie)
1709 continue;
1710 if (ssidlen && ie[1] != ssidlen)
1711 continue;
1712 if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss))
1713 continue;
1714 if (WARN_ON_ONCE(!list_empty(&bss->hidden_list)))
1715 list_del(&bss->hidden_list);
1716 /* combine them */
1717 list_add(&bss->hidden_list, &new->hidden_list);
1718 bss->pub.hidden_beacon_bss = &new->pub;
1719 new->refcount += bss->refcount;
1720 rcu_assign_pointer(bss->pub.beacon_ies,
1721 new->pub.beacon_ies);
1722 }
1723
1724 WARN_ONCE(n_entries != rdev->bss_entries,
1725 "rdev bss entries[%d]/list[len:%d] corruption\n",
1726 rdev->bss_entries, n_entries);
1727
1728 return true;
1729 }
1730
cfg80211_update_hidden_bsses(struct cfg80211_internal_bss * known,const struct cfg80211_bss_ies * new_ies,const struct cfg80211_bss_ies * old_ies)1731 static void cfg80211_update_hidden_bsses(struct cfg80211_internal_bss *known,
1732 const struct cfg80211_bss_ies *new_ies,
1733 const struct cfg80211_bss_ies *old_ies)
1734 {
1735 struct cfg80211_internal_bss *bss;
1736
1737 /* Assign beacon IEs to all sub entries */
1738 list_for_each_entry(bss, &known->hidden_list, hidden_list) {
1739 const struct cfg80211_bss_ies *ies;
1740
1741 ies = rcu_access_pointer(bss->pub.beacon_ies);
1742 WARN_ON(ies != old_ies);
1743
1744 rcu_assign_pointer(bss->pub.beacon_ies, new_ies);
1745 }
1746 }
1747
cfg80211_check_stuck_ecsa(struct cfg80211_registered_device * rdev,struct cfg80211_internal_bss * known,const struct cfg80211_bss_ies * old)1748 static void cfg80211_check_stuck_ecsa(struct cfg80211_registered_device *rdev,
1749 struct cfg80211_internal_bss *known,
1750 const struct cfg80211_bss_ies *old)
1751 {
1752 const struct ieee80211_ext_chansw_ie *ecsa;
1753 const struct element *elem_new, *elem_old;
1754 const struct cfg80211_bss_ies *new, *bcn;
1755
1756 if (known->pub.proberesp_ecsa_stuck)
1757 return;
1758
1759 new = rcu_dereference_protected(known->pub.proberesp_ies,
1760 lockdep_is_held(&rdev->bss_lock));
1761 if (WARN_ON(!new))
1762 return;
1763
1764 if (new->tsf - old->tsf < USEC_PER_SEC)
1765 return;
1766
1767 elem_old = cfg80211_find_elem(WLAN_EID_EXT_CHANSWITCH_ANN,
1768 old->data, old->len);
1769 if (!elem_old)
1770 return;
1771
1772 elem_new = cfg80211_find_elem(WLAN_EID_EXT_CHANSWITCH_ANN,
1773 new->data, new->len);
1774 if (!elem_new)
1775 return;
1776
1777 bcn = rcu_dereference_protected(known->pub.beacon_ies,
1778 lockdep_is_held(&rdev->bss_lock));
1779 if (bcn &&
1780 cfg80211_find_elem(WLAN_EID_EXT_CHANSWITCH_ANN,
1781 bcn->data, bcn->len))
1782 return;
1783
1784 if (elem_new->datalen != elem_old->datalen)
1785 return;
1786 if (elem_new->datalen < sizeof(struct ieee80211_ext_chansw_ie))
1787 return;
1788 if (memcmp(elem_new->data, elem_old->data, elem_new->datalen))
1789 return;
1790
1791 ecsa = (void *)elem_new->data;
1792
1793 if (!ecsa->mode)
1794 return;
1795
1796 if (ecsa->new_ch_num !=
1797 ieee80211_frequency_to_channel(known->pub.channel->center_freq))
1798 return;
1799
1800 known->pub.proberesp_ecsa_stuck = 1;
1801 }
1802
1803 static bool
cfg80211_update_known_bss(struct cfg80211_registered_device * rdev,struct cfg80211_internal_bss * known,struct cfg80211_internal_bss * new,bool signal_valid)1804 cfg80211_update_known_bss(struct cfg80211_registered_device *rdev,
1805 struct cfg80211_internal_bss *known,
1806 struct cfg80211_internal_bss *new,
1807 bool signal_valid)
1808 {
1809 lockdep_assert_held(&rdev->bss_lock);
1810
1811 /* Update IEs */
1812 if (rcu_access_pointer(new->pub.proberesp_ies)) {
1813 const struct cfg80211_bss_ies *old;
1814
1815 old = rcu_access_pointer(known->pub.proberesp_ies);
1816
1817 rcu_assign_pointer(known->pub.proberesp_ies,
1818 new->pub.proberesp_ies);
1819 /* Override possible earlier Beacon frame IEs */
1820 rcu_assign_pointer(known->pub.ies,
1821 new->pub.proberesp_ies);
1822 if (old) {
1823 cfg80211_check_stuck_ecsa(rdev, known, old);
1824 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1825 }
1826 }
1827
1828 if (rcu_access_pointer(new->pub.beacon_ies)) {
1829 const struct cfg80211_bss_ies *old;
1830
1831 if (known->pub.hidden_beacon_bss &&
1832 !list_empty(&known->hidden_list)) {
1833 const struct cfg80211_bss_ies *f;
1834
1835 /* The known BSS struct is one of the probe
1836 * response members of a group, but we're
1837 * receiving a beacon (beacon_ies in the new
1838 * bss is used). This can only mean that the
1839 * AP changed its beacon from not having an
1840 * SSID to showing it, which is confusing so
1841 * drop this information.
1842 */
1843
1844 f = rcu_access_pointer(new->pub.beacon_ies);
1845 kfree_rcu((struct cfg80211_bss_ies *)f, rcu_head);
1846 return false;
1847 }
1848
1849 old = rcu_access_pointer(known->pub.beacon_ies);
1850
1851 rcu_assign_pointer(known->pub.beacon_ies, new->pub.beacon_ies);
1852
1853 /* Override IEs if they were from a beacon before */
1854 if (old == rcu_access_pointer(known->pub.ies))
1855 rcu_assign_pointer(known->pub.ies, new->pub.beacon_ies);
1856
1857 cfg80211_update_hidden_bsses(known,
1858 rcu_access_pointer(new->pub.beacon_ies),
1859 old);
1860
1861 if (old)
1862 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1863 }
1864
1865 known->pub.beacon_interval = new->pub.beacon_interval;
1866
1867 /* don't update the signal if beacon was heard on
1868 * adjacent channel.
1869 */
1870 if (signal_valid)
1871 known->pub.signal = new->pub.signal;
1872 known->pub.capability = new->pub.capability;
1873 known->ts = new->ts;
1874 known->ts_boottime = new->ts_boottime;
1875 known->parent_tsf = new->parent_tsf;
1876 known->pub.chains = new->pub.chains;
1877 memcpy(known->pub.chain_signal, new->pub.chain_signal,
1878 IEEE80211_MAX_CHAINS);
1879 ether_addr_copy(known->parent_bssid, new->parent_bssid);
1880 known->pub.max_bssid_indicator = new->pub.max_bssid_indicator;
1881 known->pub.bssid_index = new->pub.bssid_index;
1882 known->pub.use_for &= new->pub.use_for;
1883 known->pub.cannot_use_reasons = new->pub.cannot_use_reasons;
1884
1885 return true;
1886 }
1887
1888 /* Returned bss is reference counted and must be cleaned up appropriately. */
1889 static struct cfg80211_internal_bss *
__cfg80211_bss_update(struct cfg80211_registered_device * rdev,struct cfg80211_internal_bss * tmp,bool signal_valid,unsigned long ts)1890 __cfg80211_bss_update(struct cfg80211_registered_device *rdev,
1891 struct cfg80211_internal_bss *tmp,
1892 bool signal_valid, unsigned long ts)
1893 {
1894 struct cfg80211_internal_bss *found = NULL;
1895 struct cfg80211_bss_ies *ies;
1896
1897 if (WARN_ON(!tmp->pub.channel))
1898 goto free_ies;
1899
1900 tmp->ts = ts;
1901
1902 if (WARN_ON(!rcu_access_pointer(tmp->pub.ies)))
1903 goto free_ies;
1904
1905 found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR);
1906
1907 if (found) {
1908 if (!cfg80211_update_known_bss(rdev, found, tmp, signal_valid))
1909 return NULL;
1910 } else {
1911 struct cfg80211_internal_bss *new;
1912 struct cfg80211_internal_bss *hidden;
1913
1914 /*
1915 * create a copy -- the "res" variable that is passed in
1916 * is allocated on the stack since it's not needed in the
1917 * more common case of an update
1918 */
1919 new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size,
1920 GFP_ATOMIC);
1921 if (!new)
1922 goto free_ies;
1923 memcpy(new, tmp, sizeof(*new));
1924 new->refcount = 1;
1925 INIT_LIST_HEAD(&new->hidden_list);
1926 INIT_LIST_HEAD(&new->pub.nontrans_list);
1927 /* we'll set this later if it was non-NULL */
1928 new->pub.transmitted_bss = NULL;
1929
1930 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
1931 hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN);
1932 if (!hidden)
1933 hidden = rb_find_bss(rdev, tmp,
1934 BSS_CMP_HIDE_NUL);
1935 if (hidden) {
1936 new->pub.hidden_beacon_bss = &hidden->pub;
1937 list_add(&new->hidden_list,
1938 &hidden->hidden_list);
1939 hidden->refcount++;
1940
1941 ies = (void *)rcu_access_pointer(new->pub.beacon_ies);
1942 rcu_assign_pointer(new->pub.beacon_ies,
1943 hidden->pub.beacon_ies);
1944 if (ies)
1945 kfree_rcu(ies, rcu_head);
1946 }
1947 } else {
1948 /*
1949 * Ok so we found a beacon, and don't have an entry. If
1950 * it's a beacon with hidden SSID, we might be in for an
1951 * expensive search for any probe responses that should
1952 * be grouped with this beacon for updates ...
1953 */
1954 if (!cfg80211_combine_bsses(rdev, new)) {
1955 bss_ref_put(rdev, new);
1956 return NULL;
1957 }
1958 }
1959
1960 if (rdev->bss_entries >= bss_entries_limit &&
1961 !cfg80211_bss_expire_oldest(rdev)) {
1962 bss_ref_put(rdev, new);
1963 return NULL;
1964 }
1965
1966 /* This must be before the call to bss_ref_get */
1967 if (tmp->pub.transmitted_bss) {
1968 new->pub.transmitted_bss = tmp->pub.transmitted_bss;
1969 bss_ref_get(rdev, bss_from_pub(tmp->pub.transmitted_bss));
1970 }
1971
1972 list_add_tail(&new->list, &rdev->bss_list);
1973 rdev->bss_entries++;
1974 rb_insert_bss(rdev, new);
1975 found = new;
1976 }
1977
1978 rdev->bss_generation++;
1979 bss_ref_get(rdev, found);
1980
1981 return found;
1982
1983 free_ies:
1984 ies = (void *)rcu_dereference(tmp->pub.beacon_ies);
1985 if (ies)
1986 kfree_rcu(ies, rcu_head);
1987 ies = (void *)rcu_dereference(tmp->pub.proberesp_ies);
1988 if (ies)
1989 kfree_rcu(ies, rcu_head);
1990
1991 return NULL;
1992 }
1993
1994 struct cfg80211_internal_bss *
cfg80211_bss_update(struct cfg80211_registered_device * rdev,struct cfg80211_internal_bss * tmp,bool signal_valid,unsigned long ts)1995 cfg80211_bss_update(struct cfg80211_registered_device *rdev,
1996 struct cfg80211_internal_bss *tmp,
1997 bool signal_valid, unsigned long ts)
1998 {
1999 struct cfg80211_internal_bss *res;
2000
2001 spin_lock_bh(&rdev->bss_lock);
2002 res = __cfg80211_bss_update(rdev, tmp, signal_valid, ts);
2003 spin_unlock_bh(&rdev->bss_lock);
2004
2005 return res;
2006 }
2007
cfg80211_get_ies_channel_number(const u8 * ie,size_t ielen,enum nl80211_band band)2008 int cfg80211_get_ies_channel_number(const u8 *ie, size_t ielen,
2009 enum nl80211_band band)
2010 {
2011 const struct element *tmp;
2012
2013 if (band == NL80211_BAND_6GHZ) {
2014 struct ieee80211_he_operation *he_oper;
2015
2016 tmp = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION, ie,
2017 ielen);
2018 if (tmp && tmp->datalen >= sizeof(*he_oper) &&
2019 tmp->datalen >= ieee80211_he_oper_size(&tmp->data[1])) {
2020 const struct ieee80211_he_6ghz_oper *he_6ghz_oper;
2021
2022 he_oper = (void *)&tmp->data[1];
2023
2024 he_6ghz_oper = ieee80211_he_6ghz_oper(he_oper);
2025 if (!he_6ghz_oper)
2026 return -1;
2027
2028 return he_6ghz_oper->primary;
2029 }
2030 } else if (band == NL80211_BAND_S1GHZ) {
2031 tmp = cfg80211_find_elem(WLAN_EID_S1G_OPERATION, ie, ielen);
2032 if (tmp && tmp->datalen >= sizeof(struct ieee80211_s1g_oper_ie)) {
2033 struct ieee80211_s1g_oper_ie *s1gop = (void *)tmp->data;
2034
2035 return s1gop->oper_ch;
2036 }
2037 } else {
2038 tmp = cfg80211_find_elem(WLAN_EID_DS_PARAMS, ie, ielen);
2039 if (tmp && tmp->datalen == 1)
2040 return tmp->data[0];
2041
2042 tmp = cfg80211_find_elem(WLAN_EID_HT_OPERATION, ie, ielen);
2043 if (tmp &&
2044 tmp->datalen >= sizeof(struct ieee80211_ht_operation)) {
2045 struct ieee80211_ht_operation *htop = (void *)tmp->data;
2046
2047 return htop->primary_chan;
2048 }
2049 }
2050
2051 return -1;
2052 }
2053 EXPORT_SYMBOL(cfg80211_get_ies_channel_number);
2054
2055 /*
2056 * Update RX channel information based on the available frame payload
2057 * information. This is mainly for the 2.4 GHz band where frames can be received
2058 * from neighboring channels and the Beacon frames use the DSSS Parameter Set
2059 * element to indicate the current (transmitting) channel, but this might also
2060 * be needed on other bands if RX frequency does not match with the actual
2061 * operating channel of a BSS, or if the AP reports a different primary channel.
2062 */
2063 static struct ieee80211_channel *
cfg80211_get_bss_channel(struct wiphy * wiphy,const u8 * ie,size_t ielen,struct ieee80211_channel * channel)2064 cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
2065 struct ieee80211_channel *channel)
2066 {
2067 u32 freq;
2068 int channel_number;
2069 struct ieee80211_channel *alt_channel;
2070
2071 channel_number = cfg80211_get_ies_channel_number(ie, ielen,
2072 channel->band);
2073
2074 if (channel_number < 0) {
2075 /* No channel information in frame payload */
2076 return channel;
2077 }
2078
2079 freq = ieee80211_channel_to_freq_khz(channel_number, channel->band);
2080
2081 /*
2082 * Frame info (beacon/prob res) is the same as received channel,
2083 * no need for further processing.
2084 */
2085 if (freq == ieee80211_channel_to_khz(channel))
2086 return channel;
2087
2088 alt_channel = ieee80211_get_channel_khz(wiphy, freq);
2089 if (!alt_channel) {
2090 if (channel->band == NL80211_BAND_2GHZ ||
2091 channel->band == NL80211_BAND_6GHZ) {
2092 /*
2093 * Better not allow unexpected channels when that could
2094 * be going beyond the 1-11 range (e.g., discovering
2095 * BSS on channel 12 when radio is configured for
2096 * channel 11) or beyond the 6 GHz channel range.
2097 */
2098 return NULL;
2099 }
2100
2101 /* No match for the payload channel number - ignore it */
2102 return channel;
2103 }
2104
2105 /*
2106 * Use the channel determined through the payload channel number
2107 * instead of the RX channel reported by the driver.
2108 */
2109 if (alt_channel->flags & IEEE80211_CHAN_DISABLED)
2110 return NULL;
2111 return alt_channel;
2112 }
2113
2114 struct cfg80211_inform_single_bss_data {
2115 struct cfg80211_inform_bss *drv_data;
2116 enum cfg80211_bss_frame_type ftype;
2117 struct ieee80211_channel *channel;
2118 u8 bssid[ETH_ALEN];
2119 u64 tsf;
2120 u16 capability;
2121 u16 beacon_interval;
2122 const u8 *ie;
2123 size_t ielen;
2124
2125 enum {
2126 BSS_SOURCE_DIRECT = 0,
2127 BSS_SOURCE_MBSSID,
2128 BSS_SOURCE_STA_PROFILE,
2129 } bss_source;
2130 /* Set if reporting bss_source != BSS_SOURCE_DIRECT */
2131 struct cfg80211_bss *source_bss;
2132 u8 max_bssid_indicator;
2133 u8 bssid_index;
2134
2135 u8 use_for;
2136 u64 cannot_use_reasons;
2137 };
2138
cfg80211_6ghz_power_type_valid(const u8 * ie,size_t ielen,const u32 flags)2139 static bool cfg80211_6ghz_power_type_valid(const u8 *ie, size_t ielen,
2140 const u32 flags)
2141 {
2142 const struct element *tmp;
2143 struct ieee80211_he_operation *he_oper;
2144
2145 tmp = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION, ie, ielen);
2146 if (tmp && tmp->datalen >= sizeof(*he_oper) + 1 &&
2147 tmp->datalen >= ieee80211_he_oper_size(tmp->data + 1)) {
2148 const struct ieee80211_he_6ghz_oper *he_6ghz_oper;
2149
2150 he_oper = (void *)&tmp->data[1];
2151 he_6ghz_oper = ieee80211_he_6ghz_oper(he_oper);
2152
2153 if (!he_6ghz_oper)
2154 return false;
2155
2156 switch (u8_get_bits(he_6ghz_oper->control,
2157 IEEE80211_HE_6GHZ_OPER_CTRL_REG_INFO)) {
2158 case IEEE80211_6GHZ_CTRL_REG_LPI_AP:
2159 case IEEE80211_6GHZ_CTRL_REG_INDOOR_LPI_AP:
2160 return true;
2161 case IEEE80211_6GHZ_CTRL_REG_SP_AP:
2162 case IEEE80211_6GHZ_CTRL_REG_INDOOR_SP_AP:
2163 return !(flags & IEEE80211_CHAN_NO_6GHZ_AFC_CLIENT);
2164 case IEEE80211_6GHZ_CTRL_REG_VLP_AP:
2165 return !(flags & IEEE80211_CHAN_NO_6GHZ_VLP_CLIENT);
2166 default:
2167 return false;
2168 }
2169 }
2170 return false;
2171 }
2172
2173 /* Returned bss is reference counted and must be cleaned up appropriately. */
2174 static struct cfg80211_bss *
cfg80211_inform_single_bss_data(struct wiphy * wiphy,struct cfg80211_inform_single_bss_data * data,gfp_t gfp)2175 cfg80211_inform_single_bss_data(struct wiphy *wiphy,
2176 struct cfg80211_inform_single_bss_data *data,
2177 gfp_t gfp)
2178 {
2179 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2180 struct cfg80211_inform_bss *drv_data = data->drv_data;
2181 struct cfg80211_bss_ies *ies;
2182 struct ieee80211_channel *channel;
2183 struct cfg80211_internal_bss tmp = {}, *res;
2184 int bss_type;
2185 bool signal_valid;
2186 unsigned long ts;
2187
2188 if (WARN_ON(!wiphy))
2189 return NULL;
2190
2191 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
2192 (drv_data->signal < 0 || drv_data->signal > 100)))
2193 return NULL;
2194
2195 if (WARN_ON(data->bss_source != BSS_SOURCE_DIRECT && !data->source_bss))
2196 return NULL;
2197
2198 channel = data->channel;
2199 if (!channel)
2200 channel = cfg80211_get_bss_channel(wiphy, data->ie, data->ielen,
2201 drv_data->chan);
2202 if (!channel)
2203 return NULL;
2204
2205 if (channel->band == NL80211_BAND_6GHZ &&
2206 !cfg80211_6ghz_power_type_valid(data->ie, data->ielen,
2207 channel->flags)) {
2208 data->use_for = 0;
2209 data->cannot_use_reasons =
2210 NL80211_BSS_CANNOT_USE_6GHZ_PWR_MISMATCH;
2211 }
2212
2213 memcpy(tmp.pub.bssid, data->bssid, ETH_ALEN);
2214 tmp.pub.channel = channel;
2215 if (data->bss_source != BSS_SOURCE_STA_PROFILE)
2216 tmp.pub.signal = drv_data->signal;
2217 else
2218 tmp.pub.signal = 0;
2219 tmp.pub.beacon_interval = data->beacon_interval;
2220 tmp.pub.capability = data->capability;
2221 tmp.ts_boottime = drv_data->boottime_ns;
2222 tmp.parent_tsf = drv_data->parent_tsf;
2223 ether_addr_copy(tmp.parent_bssid, drv_data->parent_bssid);
2224 tmp.pub.chains = drv_data->chains;
2225 memcpy(tmp.pub.chain_signal, drv_data->chain_signal,
2226 IEEE80211_MAX_CHAINS);
2227 tmp.pub.use_for = data->use_for;
2228 tmp.pub.cannot_use_reasons = data->cannot_use_reasons;
2229
2230 switch (data->bss_source) {
2231 case BSS_SOURCE_MBSSID:
2232 tmp.pub.transmitted_bss = data->source_bss;
2233 fallthrough;
2234 case BSS_SOURCE_STA_PROFILE:
2235 ts = bss_from_pub(data->source_bss)->ts;
2236 tmp.pub.bssid_index = data->bssid_index;
2237 tmp.pub.max_bssid_indicator = data->max_bssid_indicator;
2238 break;
2239 case BSS_SOURCE_DIRECT:
2240 ts = jiffies;
2241
2242 if (channel->band == NL80211_BAND_60GHZ) {
2243 bss_type = data->capability &
2244 WLAN_CAPABILITY_DMG_TYPE_MASK;
2245 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
2246 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
2247 regulatory_hint_found_beacon(wiphy, channel,
2248 gfp);
2249 } else {
2250 if (data->capability & WLAN_CAPABILITY_ESS)
2251 regulatory_hint_found_beacon(wiphy, channel,
2252 gfp);
2253 }
2254 break;
2255 }
2256
2257 /*
2258 * If we do not know here whether the IEs are from a Beacon or Probe
2259 * Response frame, we need to pick one of the options and only use it
2260 * with the driver that does not provide the full Beacon/Probe Response
2261 * frame. Use Beacon frame pointer to avoid indicating that this should
2262 * override the IEs pointer should we have received an earlier
2263 * indication of Probe Response data.
2264 */
2265 ies = kzalloc(sizeof(*ies) + data->ielen, gfp);
2266 if (!ies)
2267 return NULL;
2268 ies->len = data->ielen;
2269 ies->tsf = data->tsf;
2270 ies->from_beacon = false;
2271 memcpy(ies->data, data->ie, data->ielen);
2272
2273 switch (data->ftype) {
2274 case CFG80211_BSS_FTYPE_BEACON:
2275 case CFG80211_BSS_FTYPE_S1G_BEACON:
2276 ies->from_beacon = true;
2277 fallthrough;
2278 case CFG80211_BSS_FTYPE_UNKNOWN:
2279 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
2280 break;
2281 case CFG80211_BSS_FTYPE_PRESP:
2282 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
2283 break;
2284 }
2285 rcu_assign_pointer(tmp.pub.ies, ies);
2286
2287 signal_valid = drv_data->chan == channel;
2288 spin_lock_bh(&rdev->bss_lock);
2289 res = __cfg80211_bss_update(rdev, &tmp, signal_valid, ts);
2290 if (!res)
2291 goto drop;
2292
2293 rdev_inform_bss(rdev, &res->pub, ies, drv_data->drv_data);
2294
2295 if (data->bss_source == BSS_SOURCE_MBSSID) {
2296 /* this is a nontransmitting bss, we need to add it to
2297 * transmitting bss' list if it is not there
2298 */
2299 if (cfg80211_add_nontrans_list(data->source_bss, &res->pub)) {
2300 if (__cfg80211_unlink_bss(rdev, res)) {
2301 rdev->bss_generation++;
2302 res = NULL;
2303 }
2304 }
2305
2306 if (!res)
2307 goto drop;
2308 }
2309 spin_unlock_bh(&rdev->bss_lock);
2310
2311 trace_cfg80211_return_bss(&res->pub);
2312 /* __cfg80211_bss_update gives us a referenced result */
2313 return &res->pub;
2314
2315 drop:
2316 spin_unlock_bh(&rdev->bss_lock);
2317 return NULL;
2318 }
2319
2320 static const struct element
cfg80211_get_profile_continuation(const u8 * ie,size_t ielen,const struct element * mbssid_elem,const struct element * sub_elem)2321 *cfg80211_get_profile_continuation(const u8 *ie, size_t ielen,
2322 const struct element *mbssid_elem,
2323 const struct element *sub_elem)
2324 {
2325 const u8 *mbssid_end = mbssid_elem->data + mbssid_elem->datalen;
2326 const struct element *next_mbssid;
2327 const struct element *next_sub;
2328
2329 next_mbssid = cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID,
2330 mbssid_end,
2331 ielen - (mbssid_end - ie));
2332
2333 /*
2334 * If it is not the last subelement in current MBSSID IE or there isn't
2335 * a next MBSSID IE - profile is complete.
2336 */
2337 if ((sub_elem->data + sub_elem->datalen < mbssid_end - 1) ||
2338 !next_mbssid)
2339 return NULL;
2340
2341 /* For any length error, just return NULL */
2342
2343 if (next_mbssid->datalen < 4)
2344 return NULL;
2345
2346 next_sub = (void *)&next_mbssid->data[1];
2347
2348 if (next_mbssid->data + next_mbssid->datalen <
2349 next_sub->data + next_sub->datalen)
2350 return NULL;
2351
2352 if (next_sub->id != 0 || next_sub->datalen < 2)
2353 return NULL;
2354
2355 /*
2356 * Check if the first element in the next sub element is a start
2357 * of a new profile
2358 */
2359 return next_sub->data[0] == WLAN_EID_NON_TX_BSSID_CAP ?
2360 NULL : next_mbssid;
2361 }
2362
cfg80211_merge_profile(const u8 * ie,size_t ielen,const struct element * mbssid_elem,const struct element * sub_elem,u8 * merged_ie,size_t max_copy_len)2363 size_t cfg80211_merge_profile(const u8 *ie, size_t ielen,
2364 const struct element *mbssid_elem,
2365 const struct element *sub_elem,
2366 u8 *merged_ie, size_t max_copy_len)
2367 {
2368 size_t copied_len = sub_elem->datalen;
2369 const struct element *next_mbssid;
2370
2371 if (sub_elem->datalen > max_copy_len)
2372 return 0;
2373
2374 memcpy(merged_ie, sub_elem->data, sub_elem->datalen);
2375
2376 while ((next_mbssid = cfg80211_get_profile_continuation(ie, ielen,
2377 mbssid_elem,
2378 sub_elem))) {
2379 const struct element *next_sub = (void *)&next_mbssid->data[1];
2380
2381 if (copied_len + next_sub->datalen > max_copy_len)
2382 break;
2383 memcpy(merged_ie + copied_len, next_sub->data,
2384 next_sub->datalen);
2385 copied_len += next_sub->datalen;
2386 }
2387
2388 return copied_len;
2389 }
2390 EXPORT_SYMBOL(cfg80211_merge_profile);
2391
2392 static void
cfg80211_parse_mbssid_data(struct wiphy * wiphy,struct cfg80211_inform_single_bss_data * tx_data,struct cfg80211_bss * source_bss,gfp_t gfp)2393 cfg80211_parse_mbssid_data(struct wiphy *wiphy,
2394 struct cfg80211_inform_single_bss_data *tx_data,
2395 struct cfg80211_bss *source_bss,
2396 gfp_t gfp)
2397 {
2398 struct cfg80211_inform_single_bss_data data = {
2399 .drv_data = tx_data->drv_data,
2400 .ftype = tx_data->ftype,
2401 .tsf = tx_data->tsf,
2402 .beacon_interval = tx_data->beacon_interval,
2403 .source_bss = source_bss,
2404 .bss_source = BSS_SOURCE_MBSSID,
2405 .use_for = tx_data->use_for,
2406 .cannot_use_reasons = tx_data->cannot_use_reasons,
2407 };
2408 const u8 *mbssid_index_ie;
2409 const struct element *elem, *sub;
2410 u8 *new_ie, *profile;
2411 u64 seen_indices = 0;
2412 struct cfg80211_bss *bss;
2413
2414 if (!source_bss)
2415 return;
2416 if (!cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID,
2417 tx_data->ie, tx_data->ielen))
2418 return;
2419 if (!wiphy->support_mbssid)
2420 return;
2421 if (wiphy->support_only_he_mbssid &&
2422 !cfg80211_find_ext_elem(WLAN_EID_EXT_HE_CAPABILITY,
2423 tx_data->ie, tx_data->ielen))
2424 return;
2425
2426 new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp);
2427 if (!new_ie)
2428 return;
2429
2430 profile = kmalloc(tx_data->ielen, gfp);
2431 if (!profile)
2432 goto out;
2433
2434 for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID,
2435 tx_data->ie, tx_data->ielen) {
2436 if (elem->datalen < 4)
2437 continue;
2438 if (elem->data[0] < 1 || (int)elem->data[0] > 8)
2439 continue;
2440 for_each_element(sub, elem->data + 1, elem->datalen - 1) {
2441 u8 profile_len;
2442
2443 if (sub->id != 0 || sub->datalen < 4) {
2444 /* not a valid BSS profile */
2445 continue;
2446 }
2447
2448 if (sub->data[0] != WLAN_EID_NON_TX_BSSID_CAP ||
2449 sub->data[1] != 2) {
2450 /* The first element within the Nontransmitted
2451 * BSSID Profile is not the Nontransmitted
2452 * BSSID Capability element.
2453 */
2454 continue;
2455 }
2456
2457 memset(profile, 0, tx_data->ielen);
2458 profile_len = cfg80211_merge_profile(tx_data->ie,
2459 tx_data->ielen,
2460 elem,
2461 sub,
2462 profile,
2463 tx_data->ielen);
2464
2465 /* found a Nontransmitted BSSID Profile */
2466 mbssid_index_ie = cfg80211_find_ie
2467 (WLAN_EID_MULTI_BSSID_IDX,
2468 profile, profile_len);
2469 if (!mbssid_index_ie || mbssid_index_ie[1] < 1 ||
2470 mbssid_index_ie[2] == 0 ||
2471 mbssid_index_ie[2] > 46 ||
2472 mbssid_index_ie[2] >= (1 << elem->data[0])) {
2473 /* No valid Multiple BSSID-Index element */
2474 continue;
2475 }
2476
2477 if (seen_indices & BIT_ULL(mbssid_index_ie[2]))
2478 /* We don't support legacy split of a profile */
2479 net_dbg_ratelimited("Partial info for BSSID index %d\n",
2480 mbssid_index_ie[2]);
2481
2482 seen_indices |= BIT_ULL(mbssid_index_ie[2]);
2483
2484 data.bssid_index = mbssid_index_ie[2];
2485 data.max_bssid_indicator = elem->data[0];
2486
2487 cfg80211_gen_new_bssid(tx_data->bssid,
2488 data.max_bssid_indicator,
2489 data.bssid_index,
2490 data.bssid);
2491
2492 memset(new_ie, 0, IEEE80211_MAX_DATA_LEN);
2493 data.ie = new_ie;
2494 data.ielen = cfg80211_gen_new_ie(tx_data->ie,
2495 tx_data->ielen,
2496 profile,
2497 profile_len,
2498 new_ie,
2499 IEEE80211_MAX_DATA_LEN);
2500 if (!data.ielen)
2501 continue;
2502
2503 data.capability = get_unaligned_le16(profile + 2);
2504 bss = cfg80211_inform_single_bss_data(wiphy, &data, gfp);
2505 if (!bss)
2506 break;
2507 cfg80211_put_bss(wiphy, bss);
2508 }
2509 }
2510
2511 out:
2512 kfree(new_ie);
2513 kfree(profile);
2514 }
2515
cfg80211_defragment_element(const struct element * elem,const u8 * ies,size_t ieslen,u8 * data,size_t data_len,u8 frag_id)2516 ssize_t cfg80211_defragment_element(const struct element *elem, const u8 *ies,
2517 size_t ieslen, u8 *data, size_t data_len,
2518 u8 frag_id)
2519 {
2520 const struct element *next;
2521 ssize_t copied;
2522 u8 elem_datalen;
2523
2524 if (!elem)
2525 return -EINVAL;
2526
2527 /* elem might be invalid after the memmove */
2528 next = (void *)(elem->data + elem->datalen);
2529 elem_datalen = elem->datalen;
2530
2531 if (elem->id == WLAN_EID_EXTENSION) {
2532 copied = elem->datalen - 1;
2533
2534 if (data) {
2535 if (copied > data_len)
2536 return -ENOSPC;
2537
2538 memmove(data, elem->data + 1, copied);
2539 }
2540 } else {
2541 copied = elem->datalen;
2542
2543 if (data) {
2544 if (copied > data_len)
2545 return -ENOSPC;
2546
2547 memmove(data, elem->data, copied);
2548 }
2549 }
2550
2551 /* Fragmented elements must have 255 bytes */
2552 if (elem_datalen < 255)
2553 return copied;
2554
2555 for (elem = next;
2556 elem->data < ies + ieslen &&
2557 elem->data + elem->datalen <= ies + ieslen;
2558 elem = next) {
2559 /* elem might be invalid after the memmove */
2560 next = (void *)(elem->data + elem->datalen);
2561
2562 if (elem->id != frag_id)
2563 break;
2564
2565 elem_datalen = elem->datalen;
2566
2567 if (data) {
2568 if (copied + elem_datalen > data_len)
2569 return -ENOSPC;
2570
2571 memmove(data + copied, elem->data, elem_datalen);
2572 }
2573
2574 copied += elem_datalen;
2575
2576 /* Only the last fragment may be short */
2577 if (elem_datalen != 255)
2578 break;
2579 }
2580
2581 return copied;
2582 }
2583 EXPORT_SYMBOL(cfg80211_defragment_element);
2584
2585 struct cfg80211_mle {
2586 struct ieee80211_multi_link_elem *mle;
2587 struct ieee80211_mle_per_sta_profile
2588 *sta_prof[IEEE80211_MLD_MAX_NUM_LINKS];
2589 ssize_t sta_prof_len[IEEE80211_MLD_MAX_NUM_LINKS];
2590
2591 u8 data[];
2592 };
2593
2594 static struct cfg80211_mle *
cfg80211_defrag_mle(const struct element * mle,const u8 * ie,size_t ielen,gfp_t gfp)2595 cfg80211_defrag_mle(const struct element *mle, const u8 *ie, size_t ielen,
2596 gfp_t gfp)
2597 {
2598 const struct element *elem;
2599 struct cfg80211_mle *res;
2600 size_t buf_len;
2601 ssize_t mle_len;
2602 u8 common_size, idx;
2603
2604 if (!mle || !ieee80211_mle_size_ok(mle->data + 1, mle->datalen - 1))
2605 return NULL;
2606
2607 /* Required length for first defragmentation */
2608 buf_len = mle->datalen - 1;
2609 for_each_element(elem, mle->data + mle->datalen,
2610 ielen - sizeof(*mle) + mle->datalen) {
2611 if (elem->id != WLAN_EID_FRAGMENT)
2612 break;
2613
2614 buf_len += elem->datalen;
2615 }
2616
2617 res = kzalloc(struct_size(res, data, buf_len), gfp);
2618 if (!res)
2619 return NULL;
2620
2621 mle_len = cfg80211_defragment_element(mle, ie, ielen,
2622 res->data, buf_len,
2623 WLAN_EID_FRAGMENT);
2624 if (mle_len < 0)
2625 goto error;
2626
2627 res->mle = (void *)res->data;
2628
2629 /* Find the sub-element area in the buffer */
2630 common_size = ieee80211_mle_common_size((u8 *)res->mle);
2631 ie = res->data + common_size;
2632 ielen = mle_len - common_size;
2633
2634 idx = 0;
2635 for_each_element_id(elem, IEEE80211_MLE_SUBELEM_PER_STA_PROFILE,
2636 ie, ielen) {
2637 res->sta_prof[idx] = (void *)elem->data;
2638 res->sta_prof_len[idx] = elem->datalen;
2639
2640 idx++;
2641 if (idx >= IEEE80211_MLD_MAX_NUM_LINKS)
2642 break;
2643 }
2644 if (!for_each_element_completed(elem, ie, ielen))
2645 goto error;
2646
2647 /* Defragment sta_info in-place */
2648 for (idx = 0; idx < IEEE80211_MLD_MAX_NUM_LINKS && res->sta_prof[idx];
2649 idx++) {
2650 if (res->sta_prof_len[idx] < 255)
2651 continue;
2652
2653 elem = (void *)res->sta_prof[idx] - 2;
2654
2655 if (idx + 1 < ARRAY_SIZE(res->sta_prof) &&
2656 res->sta_prof[idx + 1])
2657 buf_len = (u8 *)res->sta_prof[idx + 1] -
2658 (u8 *)res->sta_prof[idx];
2659 else
2660 buf_len = ielen + ie - (u8 *)elem;
2661
2662 res->sta_prof_len[idx] =
2663 cfg80211_defragment_element(elem,
2664 (u8 *)elem, buf_len,
2665 (u8 *)res->sta_prof[idx],
2666 buf_len,
2667 IEEE80211_MLE_SUBELEM_FRAGMENT);
2668 if (res->sta_prof_len[idx] < 0)
2669 goto error;
2670 }
2671
2672 return res;
2673
2674 error:
2675 kfree(res);
2676 return NULL;
2677 }
2678
2679 struct tbtt_info_iter_data {
2680 const struct ieee80211_neighbor_ap_info *ap_info;
2681 u8 param_ch_count;
2682 u32 use_for;
2683 u8 mld_id, link_id;
2684 bool non_tx;
2685 };
2686
2687 static enum cfg80211_rnr_iter_ret
cfg802121_mld_ap_rnr_iter(void * _data,u8 type,const struct ieee80211_neighbor_ap_info * info,const u8 * tbtt_info,u8 tbtt_info_len)2688 cfg802121_mld_ap_rnr_iter(void *_data, u8 type,
2689 const struct ieee80211_neighbor_ap_info *info,
2690 const u8 *tbtt_info, u8 tbtt_info_len)
2691 {
2692 const struct ieee80211_rnr_mld_params *mld_params;
2693 struct tbtt_info_iter_data *data = _data;
2694 u8 link_id;
2695 bool non_tx = false;
2696
2697 if (type == IEEE80211_TBTT_INFO_TYPE_TBTT &&
2698 tbtt_info_len >= offsetofend(struct ieee80211_tbtt_info_ge_11,
2699 mld_params)) {
2700 const struct ieee80211_tbtt_info_ge_11 *tbtt_info_ge_11 =
2701 (void *)tbtt_info;
2702
2703 non_tx = (tbtt_info_ge_11->bss_params &
2704 (IEEE80211_RNR_TBTT_PARAMS_MULTI_BSSID |
2705 IEEE80211_RNR_TBTT_PARAMS_TRANSMITTED_BSSID)) ==
2706 IEEE80211_RNR_TBTT_PARAMS_MULTI_BSSID;
2707 mld_params = &tbtt_info_ge_11->mld_params;
2708 } else if (type == IEEE80211_TBTT_INFO_TYPE_MLD &&
2709 tbtt_info_len >= sizeof(struct ieee80211_rnr_mld_params))
2710 mld_params = (void *)tbtt_info;
2711 else
2712 return RNR_ITER_CONTINUE;
2713
2714 link_id = le16_get_bits(mld_params->params,
2715 IEEE80211_RNR_MLD_PARAMS_LINK_ID);
2716
2717 if (data->mld_id != mld_params->mld_id)
2718 return RNR_ITER_CONTINUE;
2719
2720 if (data->link_id != link_id)
2721 return RNR_ITER_CONTINUE;
2722
2723 data->ap_info = info;
2724 data->param_ch_count =
2725 le16_get_bits(mld_params->params,
2726 IEEE80211_RNR_MLD_PARAMS_BSS_CHANGE_COUNT);
2727 data->non_tx = non_tx;
2728
2729 if (type == IEEE80211_TBTT_INFO_TYPE_TBTT)
2730 data->use_for = NL80211_BSS_USE_FOR_ALL;
2731 else
2732 data->use_for = NL80211_BSS_USE_FOR_MLD_LINK;
2733 return RNR_ITER_BREAK;
2734 }
2735
2736 static u8
cfg80211_rnr_info_for_mld_ap(const u8 * ie,size_t ielen,u8 mld_id,u8 link_id,const struct ieee80211_neighbor_ap_info ** ap_info,u8 * param_ch_count,bool * non_tx)2737 cfg80211_rnr_info_for_mld_ap(const u8 *ie, size_t ielen, u8 mld_id, u8 link_id,
2738 const struct ieee80211_neighbor_ap_info **ap_info,
2739 u8 *param_ch_count, bool *non_tx)
2740 {
2741 struct tbtt_info_iter_data data = {
2742 .mld_id = mld_id,
2743 .link_id = link_id,
2744 };
2745
2746 cfg80211_iter_rnr(ie, ielen, cfg802121_mld_ap_rnr_iter, &data);
2747
2748 *ap_info = data.ap_info;
2749 *param_ch_count = data.param_ch_count;
2750 *non_tx = data.non_tx;
2751
2752 return data.use_for;
2753 }
2754
2755 static struct element *
cfg80211_gen_reporter_rnr(struct cfg80211_bss * source_bss,bool is_mbssid,bool same_mld,u8 link_id,u8 bss_change_count,gfp_t gfp)2756 cfg80211_gen_reporter_rnr(struct cfg80211_bss *source_bss, bool is_mbssid,
2757 bool same_mld, u8 link_id, u8 bss_change_count,
2758 gfp_t gfp)
2759 {
2760 const struct cfg80211_bss_ies *ies;
2761 struct ieee80211_neighbor_ap_info ap_info;
2762 struct ieee80211_tbtt_info_ge_11 tbtt_info;
2763 u32 short_ssid;
2764 const struct element *elem;
2765 struct element *res;
2766
2767 /*
2768 * We only generate the RNR to permit ML lookups. For that we do not
2769 * need an entry for the corresponding transmitting BSS, lets just skip
2770 * it even though it would be easy to add.
2771 */
2772 if (!same_mld)
2773 return NULL;
2774
2775 /* We could use tx_data->ies if we change cfg80211_calc_short_ssid */
2776 rcu_read_lock();
2777 ies = rcu_dereference(source_bss->ies);
2778
2779 ap_info.tbtt_info_len = offsetofend(typeof(tbtt_info), mld_params);
2780 ap_info.tbtt_info_hdr =
2781 u8_encode_bits(IEEE80211_TBTT_INFO_TYPE_TBTT,
2782 IEEE80211_AP_INFO_TBTT_HDR_TYPE) |
2783 u8_encode_bits(0, IEEE80211_AP_INFO_TBTT_HDR_COUNT);
2784
2785 ap_info.channel = ieee80211_frequency_to_channel(source_bss->channel->center_freq);
2786
2787 /* operating class */
2788 elem = cfg80211_find_elem(WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
2789 ies->data, ies->len);
2790 if (elem && elem->datalen >= 1) {
2791 ap_info.op_class = elem->data[0];
2792 } else {
2793 struct cfg80211_chan_def chandef;
2794
2795 /* The AP is not providing us with anything to work with. So
2796 * make up a somewhat reasonable operating class, but don't
2797 * bother with it too much as no one will ever use the
2798 * information.
2799 */
2800 cfg80211_chandef_create(&chandef, source_bss->channel,
2801 NL80211_CHAN_NO_HT);
2802
2803 if (!ieee80211_chandef_to_operating_class(&chandef,
2804 &ap_info.op_class))
2805 goto out_unlock;
2806 }
2807
2808 /* Just set TBTT offset and PSD 20 to invalid/unknown */
2809 tbtt_info.tbtt_offset = 255;
2810 tbtt_info.psd_20 = IEEE80211_RNR_TBTT_PARAMS_PSD_RESERVED;
2811
2812 memcpy(tbtt_info.bssid, source_bss->bssid, ETH_ALEN);
2813 if (cfg80211_calc_short_ssid(ies, &elem, &short_ssid))
2814 goto out_unlock;
2815
2816 rcu_read_unlock();
2817
2818 tbtt_info.short_ssid = cpu_to_le32(short_ssid);
2819
2820 tbtt_info.bss_params = IEEE80211_RNR_TBTT_PARAMS_SAME_SSID;
2821
2822 if (is_mbssid) {
2823 tbtt_info.bss_params |= IEEE80211_RNR_TBTT_PARAMS_MULTI_BSSID;
2824 tbtt_info.bss_params |= IEEE80211_RNR_TBTT_PARAMS_TRANSMITTED_BSSID;
2825 }
2826
2827 tbtt_info.mld_params.mld_id = 0;
2828 tbtt_info.mld_params.params =
2829 le16_encode_bits(link_id, IEEE80211_RNR_MLD_PARAMS_LINK_ID) |
2830 le16_encode_bits(bss_change_count,
2831 IEEE80211_RNR_MLD_PARAMS_BSS_CHANGE_COUNT);
2832
2833 res = kzalloc(struct_size(res, data,
2834 sizeof(ap_info) + ap_info.tbtt_info_len),
2835 gfp);
2836 if (!res)
2837 return NULL;
2838
2839 /* Copy the data */
2840 res->id = WLAN_EID_REDUCED_NEIGHBOR_REPORT;
2841 res->datalen = sizeof(ap_info) + ap_info.tbtt_info_len;
2842 memcpy(res->data, &ap_info, sizeof(ap_info));
2843 memcpy(res->data + sizeof(ap_info), &tbtt_info, ap_info.tbtt_info_len);
2844
2845 return res;
2846
2847 out_unlock:
2848 rcu_read_unlock();
2849 return NULL;
2850 }
2851
2852 static void
cfg80211_parse_ml_elem_sta_data(struct wiphy * wiphy,struct cfg80211_inform_single_bss_data * tx_data,struct cfg80211_bss * source_bss,const struct element * elem,gfp_t gfp)2853 cfg80211_parse_ml_elem_sta_data(struct wiphy *wiphy,
2854 struct cfg80211_inform_single_bss_data *tx_data,
2855 struct cfg80211_bss *source_bss,
2856 const struct element *elem,
2857 gfp_t gfp)
2858 {
2859 struct cfg80211_inform_single_bss_data data = {
2860 .drv_data = tx_data->drv_data,
2861 .ftype = tx_data->ftype,
2862 .source_bss = source_bss,
2863 .bss_source = BSS_SOURCE_STA_PROFILE,
2864 };
2865 struct element *reporter_rnr = NULL;
2866 struct ieee80211_multi_link_elem *ml_elem;
2867 struct cfg80211_mle *mle;
2868 u16 control;
2869 u8 ml_common_len;
2870 u8 *new_ie = NULL;
2871 struct cfg80211_bss *bss;
2872 u8 mld_id, reporter_link_id, bss_change_count;
2873 u16 seen_links = 0;
2874 u8 i;
2875
2876 if (!ieee80211_mle_type_ok(elem->data + 1,
2877 IEEE80211_ML_CONTROL_TYPE_BASIC,
2878 elem->datalen - 1))
2879 return;
2880
2881 ml_elem = (void *)(elem->data + 1);
2882 control = le16_to_cpu(ml_elem->control);
2883 ml_common_len = ml_elem->variable[0];
2884
2885 /* Must be present when transmitted by an AP (in a probe response) */
2886 if (!(control & IEEE80211_MLC_BASIC_PRES_BSS_PARAM_CH_CNT) ||
2887 !(control & IEEE80211_MLC_BASIC_PRES_LINK_ID) ||
2888 !(control & IEEE80211_MLC_BASIC_PRES_MLD_CAPA_OP))
2889 return;
2890
2891 reporter_link_id = ieee80211_mle_get_link_id(elem->data + 1);
2892 bss_change_count = ieee80211_mle_get_bss_param_ch_cnt(elem->data + 1);
2893
2894 /*
2895 * The MLD ID of the reporting AP is always zero. It is set if the AP
2896 * is part of an MBSSID set and will be non-zero for ML Elements
2897 * relating to a nontransmitted BSS (matching the Multi-BSSID Index,
2898 * Draft P802.11be_D3.2, 35.3.4.2)
2899 */
2900 mld_id = ieee80211_mle_get_mld_id(elem->data + 1);
2901
2902 /* Fully defrag the ML element for sta information/profile iteration */
2903 mle = cfg80211_defrag_mle(elem, tx_data->ie, tx_data->ielen, gfp);
2904 if (!mle)
2905 return;
2906
2907 /* No point in doing anything if there is no per-STA profile */
2908 if (!mle->sta_prof[0])
2909 goto out;
2910
2911 new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp);
2912 if (!new_ie)
2913 goto out;
2914
2915 reporter_rnr = cfg80211_gen_reporter_rnr(source_bss,
2916 u16_get_bits(control,
2917 IEEE80211_MLC_BASIC_PRES_MLD_ID),
2918 mld_id == 0, reporter_link_id,
2919 bss_change_count,
2920 gfp);
2921
2922 for (i = 0; i < ARRAY_SIZE(mle->sta_prof) && mle->sta_prof[i]; i++) {
2923 const struct ieee80211_neighbor_ap_info *ap_info;
2924 enum nl80211_band band;
2925 u32 freq;
2926 const u8 *profile;
2927 ssize_t profile_len;
2928 u8 param_ch_count;
2929 u8 link_id, use_for;
2930 bool non_tx;
2931
2932 if (!ieee80211_mle_basic_sta_prof_size_ok((u8 *)mle->sta_prof[i],
2933 mle->sta_prof_len[i]))
2934 continue;
2935
2936 control = le16_to_cpu(mle->sta_prof[i]->control);
2937
2938 if (!(control & IEEE80211_MLE_STA_CONTROL_COMPLETE_PROFILE))
2939 continue;
2940
2941 link_id = u16_get_bits(control,
2942 IEEE80211_MLE_STA_CONTROL_LINK_ID);
2943 if (seen_links & BIT(link_id))
2944 break;
2945 seen_links |= BIT(link_id);
2946
2947 if (!(control & IEEE80211_MLE_STA_CONTROL_BEACON_INT_PRESENT) ||
2948 !(control & IEEE80211_MLE_STA_CONTROL_TSF_OFFS_PRESENT) ||
2949 !(control & IEEE80211_MLE_STA_CONTROL_STA_MAC_ADDR_PRESENT))
2950 continue;
2951
2952 memcpy(data.bssid, mle->sta_prof[i]->variable, ETH_ALEN);
2953 data.beacon_interval =
2954 get_unaligned_le16(mle->sta_prof[i]->variable + 6);
2955 data.tsf = tx_data->tsf +
2956 get_unaligned_le64(mle->sta_prof[i]->variable + 8);
2957
2958 /* sta_info_len counts itself */
2959 profile = mle->sta_prof[i]->variable +
2960 mle->sta_prof[i]->sta_info_len - 1;
2961 profile_len = (u8 *)mle->sta_prof[i] + mle->sta_prof_len[i] -
2962 profile;
2963
2964 if (profile_len < 2)
2965 continue;
2966
2967 data.capability = get_unaligned_le16(profile);
2968 profile += 2;
2969 profile_len -= 2;
2970
2971 /* Find in RNR to look up channel information */
2972 use_for = cfg80211_rnr_info_for_mld_ap(tx_data->ie,
2973 tx_data->ielen,
2974 mld_id, link_id,
2975 &ap_info,
2976 ¶m_ch_count,
2977 &non_tx);
2978 if (!use_for)
2979 continue;
2980
2981 /*
2982 * As of 802.11be_D5.0, the specification does not give us any
2983 * way of discovering both the MaxBSSID and the Multiple-BSSID
2984 * Index. It does seem like the Multiple-BSSID Index element
2985 * may be provided, but section 9.4.2.45 explicitly forbids
2986 * including a Multiple-BSSID Element (in this case without any
2987 * subelements).
2988 * Without both pieces of information we cannot calculate the
2989 * reference BSSID, so simply ignore the BSS.
2990 */
2991 if (non_tx)
2992 continue;
2993
2994 /* We could sanity check the BSSID is included */
2995
2996 if (!ieee80211_operating_class_to_band(ap_info->op_class,
2997 &band))
2998 continue;
2999
3000 freq = ieee80211_channel_to_freq_khz(ap_info->channel, band);
3001 data.channel = ieee80211_get_channel_khz(wiphy, freq);
3002
3003 if (use_for == NL80211_BSS_USE_FOR_MLD_LINK &&
3004 !(wiphy->flags & WIPHY_FLAG_SUPPORTS_NSTR_NONPRIMARY)) {
3005 use_for = 0;
3006 data.cannot_use_reasons =
3007 NL80211_BSS_CANNOT_USE_NSTR_NONPRIMARY;
3008 }
3009 data.use_for = use_for;
3010
3011 /* Generate new elements */
3012 memset(new_ie, 0, IEEE80211_MAX_DATA_LEN);
3013 data.ie = new_ie;
3014 data.ielen = cfg80211_gen_new_ie(tx_data->ie, tx_data->ielen,
3015 profile, profile_len,
3016 new_ie,
3017 IEEE80211_MAX_DATA_LEN);
3018 if (!data.ielen)
3019 continue;
3020
3021 /* The generated elements do not contain:
3022 * - Basic ML element
3023 * - A TBTT entry in the RNR for the transmitting AP
3024 *
3025 * This information is needed both internally and in userspace
3026 * as such, we should append it here.
3027 */
3028 if (data.ielen + 3 + sizeof(*ml_elem) + ml_common_len >
3029 IEEE80211_MAX_DATA_LEN)
3030 continue;
3031
3032 /* Copy the Basic Multi-Link element including the common
3033 * information, and then fix up the link ID and BSS param
3034 * change count.
3035 * Note that the ML element length has been verified and we
3036 * also checked that it contains the link ID.
3037 */
3038 new_ie[data.ielen++] = WLAN_EID_EXTENSION;
3039 new_ie[data.ielen++] = 1 + sizeof(*ml_elem) + ml_common_len;
3040 new_ie[data.ielen++] = WLAN_EID_EXT_EHT_MULTI_LINK;
3041 memcpy(new_ie + data.ielen, ml_elem,
3042 sizeof(*ml_elem) + ml_common_len);
3043
3044 new_ie[data.ielen + sizeof(*ml_elem) + 1 + ETH_ALEN] = link_id;
3045 new_ie[data.ielen + sizeof(*ml_elem) + 1 + ETH_ALEN + 1] =
3046 param_ch_count;
3047
3048 data.ielen += sizeof(*ml_elem) + ml_common_len;
3049
3050 if (reporter_rnr && (use_for & NL80211_BSS_USE_FOR_NORMAL)) {
3051 if (data.ielen + sizeof(struct element) +
3052 reporter_rnr->datalen > IEEE80211_MAX_DATA_LEN)
3053 continue;
3054
3055 memcpy(new_ie + data.ielen, reporter_rnr,
3056 sizeof(struct element) + reporter_rnr->datalen);
3057 data.ielen += sizeof(struct element) +
3058 reporter_rnr->datalen;
3059 }
3060
3061 bss = cfg80211_inform_single_bss_data(wiphy, &data, gfp);
3062 if (!bss)
3063 break;
3064 cfg80211_put_bss(wiphy, bss);
3065 }
3066
3067 out:
3068 kfree(reporter_rnr);
3069 kfree(new_ie);
3070 kfree(mle);
3071 }
3072
cfg80211_parse_ml_sta_data(struct wiphy * wiphy,struct cfg80211_inform_single_bss_data * tx_data,struct cfg80211_bss * source_bss,gfp_t gfp)3073 static void cfg80211_parse_ml_sta_data(struct wiphy *wiphy,
3074 struct cfg80211_inform_single_bss_data *tx_data,
3075 struct cfg80211_bss *source_bss,
3076 gfp_t gfp)
3077 {
3078 const struct element *elem;
3079
3080 if (!source_bss)
3081 return;
3082
3083 if (tx_data->ftype != CFG80211_BSS_FTYPE_PRESP)
3084 return;
3085
3086 for_each_element_extid(elem, WLAN_EID_EXT_EHT_MULTI_LINK,
3087 tx_data->ie, tx_data->ielen)
3088 cfg80211_parse_ml_elem_sta_data(wiphy, tx_data, source_bss,
3089 elem, gfp);
3090 }
3091
3092 struct cfg80211_bss *
cfg80211_inform_bss_data(struct wiphy * wiphy,struct cfg80211_inform_bss * data,enum cfg80211_bss_frame_type ftype,const u8 * bssid,u64 tsf,u16 capability,u16 beacon_interval,const u8 * ie,size_t ielen,gfp_t gfp)3093 cfg80211_inform_bss_data(struct wiphy *wiphy,
3094 struct cfg80211_inform_bss *data,
3095 enum cfg80211_bss_frame_type ftype,
3096 const u8 *bssid, u64 tsf, u16 capability,
3097 u16 beacon_interval, const u8 *ie, size_t ielen,
3098 gfp_t gfp)
3099 {
3100 struct cfg80211_inform_single_bss_data inform_data = {
3101 .drv_data = data,
3102 .ftype = ftype,
3103 .tsf = tsf,
3104 .capability = capability,
3105 .beacon_interval = beacon_interval,
3106 .ie = ie,
3107 .ielen = ielen,
3108 .use_for = data->restrict_use ?
3109 data->use_for :
3110 NL80211_BSS_USE_FOR_ALL,
3111 .cannot_use_reasons = data->cannot_use_reasons,
3112 };
3113 struct cfg80211_bss *res;
3114
3115 memcpy(inform_data.bssid, bssid, ETH_ALEN);
3116
3117 res = cfg80211_inform_single_bss_data(wiphy, &inform_data, gfp);
3118 if (!res)
3119 return NULL;
3120
3121 /* don't do any further MBSSID/ML handling for S1G */
3122 if (ftype == CFG80211_BSS_FTYPE_S1G_BEACON)
3123 return res;
3124
3125 cfg80211_parse_mbssid_data(wiphy, &inform_data, res, gfp);
3126
3127 cfg80211_parse_ml_sta_data(wiphy, &inform_data, res, gfp);
3128
3129 return res;
3130 }
3131 EXPORT_SYMBOL(cfg80211_inform_bss_data);
3132
3133 struct cfg80211_bss *
cfg80211_inform_bss_frame_data(struct wiphy * wiphy,struct cfg80211_inform_bss * data,struct ieee80211_mgmt * mgmt,size_t len,gfp_t gfp)3134 cfg80211_inform_bss_frame_data(struct wiphy *wiphy,
3135 struct cfg80211_inform_bss *data,
3136 struct ieee80211_mgmt *mgmt, size_t len,
3137 gfp_t gfp)
3138 {
3139 size_t min_hdr_len = offsetof(struct ieee80211_mgmt,
3140 u.probe_resp.variable);
3141 struct ieee80211_ext *ext = NULL;
3142 enum cfg80211_bss_frame_type ftype;
3143 u16 beacon_interval;
3144 const u8 *bssid;
3145 u16 capability;
3146 const u8 *ie;
3147 size_t ielen;
3148 u64 tsf;
3149
3150 if (WARN_ON(!mgmt))
3151 return NULL;
3152
3153 if (WARN_ON(!wiphy))
3154 return NULL;
3155
3156 BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
3157 offsetof(struct ieee80211_mgmt, u.beacon.variable));
3158
3159 trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len);
3160
3161 if (ieee80211_is_s1g_beacon(mgmt->frame_control)) {
3162 ext = (void *) mgmt;
3163 min_hdr_len = offsetof(struct ieee80211_ext, u.s1g_beacon);
3164 if (ieee80211_is_s1g_short_beacon(mgmt->frame_control))
3165 min_hdr_len = offsetof(struct ieee80211_ext,
3166 u.s1g_short_beacon.variable);
3167 }
3168
3169 if (WARN_ON(len < min_hdr_len))
3170 return NULL;
3171
3172 ielen = len - min_hdr_len;
3173 ie = mgmt->u.probe_resp.variable;
3174 if (ext) {
3175 const struct ieee80211_s1g_bcn_compat_ie *compat;
3176 const struct element *elem;
3177
3178 if (ieee80211_is_s1g_short_beacon(mgmt->frame_control))
3179 ie = ext->u.s1g_short_beacon.variable;
3180 else
3181 ie = ext->u.s1g_beacon.variable;
3182
3183 elem = cfg80211_find_elem(WLAN_EID_S1G_BCN_COMPAT, ie, ielen);
3184 if (!elem)
3185 return NULL;
3186 if (elem->datalen < sizeof(*compat))
3187 return NULL;
3188 compat = (void *)elem->data;
3189 bssid = ext->u.s1g_beacon.sa;
3190 capability = le16_to_cpu(compat->compat_info);
3191 beacon_interval = le16_to_cpu(compat->beacon_int);
3192 } else {
3193 bssid = mgmt->bssid;
3194 beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
3195 capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
3196 }
3197
3198 tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
3199
3200 if (ieee80211_is_probe_resp(mgmt->frame_control))
3201 ftype = CFG80211_BSS_FTYPE_PRESP;
3202 else if (ext)
3203 ftype = CFG80211_BSS_FTYPE_S1G_BEACON;
3204 else
3205 ftype = CFG80211_BSS_FTYPE_BEACON;
3206
3207 return cfg80211_inform_bss_data(wiphy, data, ftype,
3208 bssid, tsf, capability,
3209 beacon_interval, ie, ielen,
3210 gfp);
3211 }
3212 EXPORT_SYMBOL(cfg80211_inform_bss_frame_data);
3213
cfg80211_ref_bss(struct wiphy * wiphy,struct cfg80211_bss * pub)3214 void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
3215 {
3216 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
3217
3218 if (!pub)
3219 return;
3220
3221 spin_lock_bh(&rdev->bss_lock);
3222 bss_ref_get(rdev, bss_from_pub(pub));
3223 spin_unlock_bh(&rdev->bss_lock);
3224 }
3225 EXPORT_SYMBOL(cfg80211_ref_bss);
3226
cfg80211_put_bss(struct wiphy * wiphy,struct cfg80211_bss * pub)3227 void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
3228 {
3229 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
3230
3231 if (!pub)
3232 return;
3233
3234 spin_lock_bh(&rdev->bss_lock);
3235 bss_ref_put(rdev, bss_from_pub(pub));
3236 spin_unlock_bh(&rdev->bss_lock);
3237 }
3238 EXPORT_SYMBOL(cfg80211_put_bss);
3239
cfg80211_unlink_bss(struct wiphy * wiphy,struct cfg80211_bss * pub)3240 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
3241 {
3242 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
3243 struct cfg80211_internal_bss *bss, *tmp1;
3244 struct cfg80211_bss *nontrans_bss, *tmp;
3245
3246 if (WARN_ON(!pub))
3247 return;
3248
3249 bss = bss_from_pub(pub);
3250
3251 spin_lock_bh(&rdev->bss_lock);
3252 if (list_empty(&bss->list))
3253 goto out;
3254
3255 list_for_each_entry_safe(nontrans_bss, tmp,
3256 &pub->nontrans_list,
3257 nontrans_list) {
3258 tmp1 = bss_from_pub(nontrans_bss);
3259 if (__cfg80211_unlink_bss(rdev, tmp1))
3260 rdev->bss_generation++;
3261 }
3262
3263 if (__cfg80211_unlink_bss(rdev, bss))
3264 rdev->bss_generation++;
3265 out:
3266 spin_unlock_bh(&rdev->bss_lock);
3267 }
3268 EXPORT_SYMBOL(cfg80211_unlink_bss);
3269
cfg80211_bss_iter(struct wiphy * wiphy,struct cfg80211_chan_def * chandef,void (* iter)(struct wiphy * wiphy,struct cfg80211_bss * bss,void * data),void * iter_data)3270 void cfg80211_bss_iter(struct wiphy *wiphy,
3271 struct cfg80211_chan_def *chandef,
3272 void (*iter)(struct wiphy *wiphy,
3273 struct cfg80211_bss *bss,
3274 void *data),
3275 void *iter_data)
3276 {
3277 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
3278 struct cfg80211_internal_bss *bss;
3279
3280 spin_lock_bh(&rdev->bss_lock);
3281
3282 list_for_each_entry(bss, &rdev->bss_list, list) {
3283 if (!chandef || cfg80211_is_sub_chan(chandef, bss->pub.channel,
3284 false))
3285 iter(wiphy, &bss->pub, iter_data);
3286 }
3287
3288 spin_unlock_bh(&rdev->bss_lock);
3289 }
3290 EXPORT_SYMBOL(cfg80211_bss_iter);
3291
cfg80211_update_assoc_bss_entry(struct wireless_dev * wdev,unsigned int link_id,struct ieee80211_channel * chan)3292 void cfg80211_update_assoc_bss_entry(struct wireless_dev *wdev,
3293 unsigned int link_id,
3294 struct ieee80211_channel *chan)
3295 {
3296 struct wiphy *wiphy = wdev->wiphy;
3297 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
3298 struct cfg80211_internal_bss *cbss = wdev->links[link_id].client.current_bss;
3299 struct cfg80211_internal_bss *new = NULL;
3300 struct cfg80211_internal_bss *bss;
3301 struct cfg80211_bss *nontrans_bss;
3302 struct cfg80211_bss *tmp;
3303
3304 spin_lock_bh(&rdev->bss_lock);
3305
3306 /*
3307 * Some APs use CSA also for bandwidth changes, i.e., without actually
3308 * changing the control channel, so no need to update in such a case.
3309 */
3310 if (cbss->pub.channel == chan)
3311 goto done;
3312
3313 /* use transmitting bss */
3314 if (cbss->pub.transmitted_bss)
3315 cbss = bss_from_pub(cbss->pub.transmitted_bss);
3316
3317 cbss->pub.channel = chan;
3318
3319 list_for_each_entry(bss, &rdev->bss_list, list) {
3320 if (!cfg80211_bss_type_match(bss->pub.capability,
3321 bss->pub.channel->band,
3322 wdev->conn_bss_type))
3323 continue;
3324
3325 if (bss == cbss)
3326 continue;
3327
3328 if (!cmp_bss(&bss->pub, &cbss->pub, BSS_CMP_REGULAR)) {
3329 new = bss;
3330 break;
3331 }
3332 }
3333
3334 if (new) {
3335 /* to save time, update IEs for transmitting bss only */
3336 cfg80211_update_known_bss(rdev, cbss, new, false);
3337 new->pub.proberesp_ies = NULL;
3338 new->pub.beacon_ies = NULL;
3339
3340 list_for_each_entry_safe(nontrans_bss, tmp,
3341 &new->pub.nontrans_list,
3342 nontrans_list) {
3343 bss = bss_from_pub(nontrans_bss);
3344 if (__cfg80211_unlink_bss(rdev, bss))
3345 rdev->bss_generation++;
3346 }
3347
3348 WARN_ON(atomic_read(&new->hold));
3349 if (!WARN_ON(!__cfg80211_unlink_bss(rdev, new)))
3350 rdev->bss_generation++;
3351 }
3352
3353 rb_erase(&cbss->rbn, &rdev->bss_tree);
3354 rb_insert_bss(rdev, cbss);
3355 rdev->bss_generation++;
3356
3357 list_for_each_entry_safe(nontrans_bss, tmp,
3358 &cbss->pub.nontrans_list,
3359 nontrans_list) {
3360 bss = bss_from_pub(nontrans_bss);
3361 bss->pub.channel = chan;
3362 rb_erase(&bss->rbn, &rdev->bss_tree);
3363 rb_insert_bss(rdev, bss);
3364 rdev->bss_generation++;
3365 }
3366
3367 done:
3368 spin_unlock_bh(&rdev->bss_lock);
3369 }
3370
3371 #ifdef CONFIG_CFG80211_WEXT
3372 static struct cfg80211_registered_device *
cfg80211_get_dev_from_ifindex(struct net * net,int ifindex)3373 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
3374 {
3375 struct cfg80211_registered_device *rdev;
3376 struct net_device *dev;
3377
3378 ASSERT_RTNL();
3379
3380 dev = dev_get_by_index(net, ifindex);
3381 if (!dev)
3382 return ERR_PTR(-ENODEV);
3383 if (dev->ieee80211_ptr)
3384 rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy);
3385 else
3386 rdev = ERR_PTR(-ENODEV);
3387 dev_put(dev);
3388 return rdev;
3389 }
3390
cfg80211_wext_siwscan(struct net_device * dev,struct iw_request_info * info,union iwreq_data * wrqu,char * extra)3391 int cfg80211_wext_siwscan(struct net_device *dev,
3392 struct iw_request_info *info,
3393 union iwreq_data *wrqu, char *extra)
3394 {
3395 struct cfg80211_registered_device *rdev;
3396 struct wiphy *wiphy;
3397 struct iw_scan_req *wreq = NULL;
3398 struct cfg80211_scan_request *creq;
3399 int i, err, n_channels = 0;
3400 enum nl80211_band band;
3401
3402 if (!netif_running(dev))
3403 return -ENETDOWN;
3404
3405 if (wrqu->data.length == sizeof(struct iw_scan_req))
3406 wreq = (struct iw_scan_req *)extra;
3407
3408 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
3409
3410 if (IS_ERR(rdev))
3411 return PTR_ERR(rdev);
3412
3413 if (rdev->scan_req || rdev->scan_msg)
3414 return -EBUSY;
3415
3416 wiphy = &rdev->wiphy;
3417
3418 /* Determine number of channels, needed to allocate creq */
3419 if (wreq && wreq->num_channels)
3420 n_channels = wreq->num_channels;
3421 else
3422 n_channels = ieee80211_get_num_supported_channels(wiphy);
3423
3424 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
3425 n_channels * sizeof(void *),
3426 GFP_ATOMIC);
3427 if (!creq)
3428 return -ENOMEM;
3429
3430 creq->wiphy = wiphy;
3431 creq->wdev = dev->ieee80211_ptr;
3432 /* SSIDs come after channels */
3433 creq->ssids = (void *)&creq->channels[n_channels];
3434 creq->n_channels = n_channels;
3435 creq->n_ssids = 1;
3436 creq->scan_start = jiffies;
3437
3438 /* translate "Scan on frequencies" request */
3439 i = 0;
3440 for (band = 0; band < NUM_NL80211_BANDS; band++) {
3441 int j;
3442
3443 if (!wiphy->bands[band])
3444 continue;
3445
3446 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
3447 /* ignore disabled channels */
3448 if (wiphy->bands[band]->channels[j].flags &
3449 IEEE80211_CHAN_DISABLED)
3450 continue;
3451
3452 /* If we have a wireless request structure and the
3453 * wireless request specifies frequencies, then search
3454 * for the matching hardware channel.
3455 */
3456 if (wreq && wreq->num_channels) {
3457 int k;
3458 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
3459 for (k = 0; k < wreq->num_channels; k++) {
3460 struct iw_freq *freq =
3461 &wreq->channel_list[k];
3462 int wext_freq =
3463 cfg80211_wext_freq(freq);
3464
3465 if (wext_freq == wiphy_freq)
3466 goto wext_freq_found;
3467 }
3468 goto wext_freq_not_found;
3469 }
3470
3471 wext_freq_found:
3472 creq->channels[i] = &wiphy->bands[band]->channels[j];
3473 i++;
3474 wext_freq_not_found: ;
3475 }
3476 }
3477 /* No channels found? */
3478 if (!i) {
3479 err = -EINVAL;
3480 goto out;
3481 }
3482
3483 /* Set real number of channels specified in creq->channels[] */
3484 creq->n_channels = i;
3485
3486 /* translate "Scan for SSID" request */
3487 if (wreq) {
3488 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
3489 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
3490 err = -EINVAL;
3491 goto out;
3492 }
3493 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
3494 creq->ssids[0].ssid_len = wreq->essid_len;
3495 }
3496 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
3497 creq->n_ssids = 0;
3498 }
3499
3500 for (i = 0; i < NUM_NL80211_BANDS; i++)
3501 if (wiphy->bands[i])
3502 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
3503
3504 eth_broadcast_addr(creq->bssid);
3505
3506 wiphy_lock(&rdev->wiphy);
3507
3508 rdev->scan_req = creq;
3509 err = rdev_scan(rdev, creq);
3510 if (err) {
3511 rdev->scan_req = NULL;
3512 /* creq will be freed below */
3513 } else {
3514 nl80211_send_scan_start(rdev, dev->ieee80211_ptr);
3515 /* creq now owned by driver */
3516 creq = NULL;
3517 dev_hold(dev);
3518 }
3519 wiphy_unlock(&rdev->wiphy);
3520 out:
3521 kfree(creq);
3522 return err;
3523 }
3524 EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan);
3525
ieee80211_scan_add_ies(struct iw_request_info * info,const struct cfg80211_bss_ies * ies,char * current_ev,char * end_buf)3526 static char *ieee80211_scan_add_ies(struct iw_request_info *info,
3527 const struct cfg80211_bss_ies *ies,
3528 char *current_ev, char *end_buf)
3529 {
3530 const u8 *pos, *end, *next;
3531 struct iw_event iwe;
3532
3533 if (!ies)
3534 return current_ev;
3535
3536 /*
3537 * If needed, fragment the IEs buffer (at IE boundaries) into short
3538 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
3539 */
3540 pos = ies->data;
3541 end = pos + ies->len;
3542
3543 while (end - pos > IW_GENERIC_IE_MAX) {
3544 next = pos + 2 + pos[1];
3545 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
3546 next = next + 2 + next[1];
3547
3548 memset(&iwe, 0, sizeof(iwe));
3549 iwe.cmd = IWEVGENIE;
3550 iwe.u.data.length = next - pos;
3551 current_ev = iwe_stream_add_point_check(info, current_ev,
3552 end_buf, &iwe,
3553 (void *)pos);
3554 if (IS_ERR(current_ev))
3555 return current_ev;
3556 pos = next;
3557 }
3558
3559 if (end > pos) {
3560 memset(&iwe, 0, sizeof(iwe));
3561 iwe.cmd = IWEVGENIE;
3562 iwe.u.data.length = end - pos;
3563 current_ev = iwe_stream_add_point_check(info, current_ev,
3564 end_buf, &iwe,
3565 (void *)pos);
3566 if (IS_ERR(current_ev))
3567 return current_ev;
3568 }
3569
3570 return current_ev;
3571 }
3572
3573 static char *
ieee80211_bss(struct wiphy * wiphy,struct iw_request_info * info,struct cfg80211_internal_bss * bss,char * current_ev,char * end_buf)3574 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
3575 struct cfg80211_internal_bss *bss, char *current_ev,
3576 char *end_buf)
3577 {
3578 const struct cfg80211_bss_ies *ies;
3579 struct iw_event iwe;
3580 const u8 *ie;
3581 u8 buf[50];
3582 u8 *cfg, *p, *tmp;
3583 int rem, i, sig;
3584 bool ismesh = false;
3585
3586 memset(&iwe, 0, sizeof(iwe));
3587 iwe.cmd = SIOCGIWAP;
3588 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
3589 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
3590 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
3591 IW_EV_ADDR_LEN);
3592 if (IS_ERR(current_ev))
3593 return current_ev;
3594
3595 memset(&iwe, 0, sizeof(iwe));
3596 iwe.cmd = SIOCGIWFREQ;
3597 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
3598 iwe.u.freq.e = 0;
3599 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
3600 IW_EV_FREQ_LEN);
3601 if (IS_ERR(current_ev))
3602 return current_ev;
3603
3604 memset(&iwe, 0, sizeof(iwe));
3605 iwe.cmd = SIOCGIWFREQ;
3606 iwe.u.freq.m = bss->pub.channel->center_freq;
3607 iwe.u.freq.e = 6;
3608 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
3609 IW_EV_FREQ_LEN);
3610 if (IS_ERR(current_ev))
3611 return current_ev;
3612
3613 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
3614 memset(&iwe, 0, sizeof(iwe));
3615 iwe.cmd = IWEVQUAL;
3616 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
3617 IW_QUAL_NOISE_INVALID |
3618 IW_QUAL_QUAL_UPDATED;
3619 switch (wiphy->signal_type) {
3620 case CFG80211_SIGNAL_TYPE_MBM:
3621 sig = bss->pub.signal / 100;
3622 iwe.u.qual.level = sig;
3623 iwe.u.qual.updated |= IW_QUAL_DBM;
3624 if (sig < -110) /* rather bad */
3625 sig = -110;
3626 else if (sig > -40) /* perfect */
3627 sig = -40;
3628 /* will give a range of 0 .. 70 */
3629 iwe.u.qual.qual = sig + 110;
3630 break;
3631 case CFG80211_SIGNAL_TYPE_UNSPEC:
3632 iwe.u.qual.level = bss->pub.signal;
3633 /* will give range 0 .. 100 */
3634 iwe.u.qual.qual = bss->pub.signal;
3635 break;
3636 default:
3637 /* not reached */
3638 break;
3639 }
3640 current_ev = iwe_stream_add_event_check(info, current_ev,
3641 end_buf, &iwe,
3642 IW_EV_QUAL_LEN);
3643 if (IS_ERR(current_ev))
3644 return current_ev;
3645 }
3646
3647 memset(&iwe, 0, sizeof(iwe));
3648 iwe.cmd = SIOCGIWENCODE;
3649 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
3650 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
3651 else
3652 iwe.u.data.flags = IW_ENCODE_DISABLED;
3653 iwe.u.data.length = 0;
3654 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
3655 &iwe, "");
3656 if (IS_ERR(current_ev))
3657 return current_ev;
3658
3659 rcu_read_lock();
3660 ies = rcu_dereference(bss->pub.ies);
3661 rem = ies->len;
3662 ie = ies->data;
3663
3664 while (rem >= 2) {
3665 /* invalid data */
3666 if (ie[1] > rem - 2)
3667 break;
3668
3669 switch (ie[0]) {
3670 case WLAN_EID_SSID:
3671 memset(&iwe, 0, sizeof(iwe));
3672 iwe.cmd = SIOCGIWESSID;
3673 iwe.u.data.length = ie[1];
3674 iwe.u.data.flags = 1;
3675 current_ev = iwe_stream_add_point_check(info,
3676 current_ev,
3677 end_buf, &iwe,
3678 (u8 *)ie + 2);
3679 if (IS_ERR(current_ev))
3680 goto unlock;
3681 break;
3682 case WLAN_EID_MESH_ID:
3683 memset(&iwe, 0, sizeof(iwe));
3684 iwe.cmd = SIOCGIWESSID;
3685 iwe.u.data.length = ie[1];
3686 iwe.u.data.flags = 1;
3687 current_ev = iwe_stream_add_point_check(info,
3688 current_ev,
3689 end_buf, &iwe,
3690 (u8 *)ie + 2);
3691 if (IS_ERR(current_ev))
3692 goto unlock;
3693 break;
3694 case WLAN_EID_MESH_CONFIG:
3695 ismesh = true;
3696 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
3697 break;
3698 cfg = (u8 *)ie + 2;
3699 memset(&iwe, 0, sizeof(iwe));
3700 iwe.cmd = IWEVCUSTOM;
3701 iwe.u.data.length = sprintf(buf,
3702 "Mesh Network Path Selection Protocol ID: 0x%02X",
3703 cfg[0]);
3704 current_ev = iwe_stream_add_point_check(info,
3705 current_ev,
3706 end_buf,
3707 &iwe, buf);
3708 if (IS_ERR(current_ev))
3709 goto unlock;
3710 iwe.u.data.length = sprintf(buf,
3711 "Path Selection Metric ID: 0x%02X",
3712 cfg[1]);
3713 current_ev = iwe_stream_add_point_check(info,
3714 current_ev,
3715 end_buf,
3716 &iwe, buf);
3717 if (IS_ERR(current_ev))
3718 goto unlock;
3719 iwe.u.data.length = sprintf(buf,
3720 "Congestion Control Mode ID: 0x%02X",
3721 cfg[2]);
3722 current_ev = iwe_stream_add_point_check(info,
3723 current_ev,
3724 end_buf,
3725 &iwe, buf);
3726 if (IS_ERR(current_ev))
3727 goto unlock;
3728 iwe.u.data.length = sprintf(buf,
3729 "Synchronization ID: 0x%02X",
3730 cfg[3]);
3731 current_ev = iwe_stream_add_point_check(info,
3732 current_ev,
3733 end_buf,
3734 &iwe, buf);
3735 if (IS_ERR(current_ev))
3736 goto unlock;
3737 iwe.u.data.length = sprintf(buf,
3738 "Authentication ID: 0x%02X",
3739 cfg[4]);
3740 current_ev = iwe_stream_add_point_check(info,
3741 current_ev,
3742 end_buf,
3743 &iwe, buf);
3744 if (IS_ERR(current_ev))
3745 goto unlock;
3746 iwe.u.data.length = sprintf(buf,
3747 "Formation Info: 0x%02X",
3748 cfg[5]);
3749 current_ev = iwe_stream_add_point_check(info,
3750 current_ev,
3751 end_buf,
3752 &iwe, buf);
3753 if (IS_ERR(current_ev))
3754 goto unlock;
3755 iwe.u.data.length = sprintf(buf,
3756 "Capabilities: 0x%02X",
3757 cfg[6]);
3758 current_ev = iwe_stream_add_point_check(info,
3759 current_ev,
3760 end_buf,
3761 &iwe, buf);
3762 if (IS_ERR(current_ev))
3763 goto unlock;
3764 break;
3765 case WLAN_EID_SUPP_RATES:
3766 case WLAN_EID_EXT_SUPP_RATES:
3767 /* display all supported rates in readable format */
3768 p = current_ev + iwe_stream_lcp_len(info);
3769
3770 memset(&iwe, 0, sizeof(iwe));
3771 iwe.cmd = SIOCGIWRATE;
3772 /* Those two flags are ignored... */
3773 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
3774
3775 for (i = 0; i < ie[1]; i++) {
3776 iwe.u.bitrate.value =
3777 ((ie[i + 2] & 0x7f) * 500000);
3778 tmp = p;
3779 p = iwe_stream_add_value(info, current_ev, p,
3780 end_buf, &iwe,
3781 IW_EV_PARAM_LEN);
3782 if (p == tmp) {
3783 current_ev = ERR_PTR(-E2BIG);
3784 goto unlock;
3785 }
3786 }
3787 current_ev = p;
3788 break;
3789 }
3790 rem -= ie[1] + 2;
3791 ie += ie[1] + 2;
3792 }
3793
3794 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
3795 ismesh) {
3796 memset(&iwe, 0, sizeof(iwe));
3797 iwe.cmd = SIOCGIWMODE;
3798 if (ismesh)
3799 iwe.u.mode = IW_MODE_MESH;
3800 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
3801 iwe.u.mode = IW_MODE_MASTER;
3802 else
3803 iwe.u.mode = IW_MODE_ADHOC;
3804 current_ev = iwe_stream_add_event_check(info, current_ev,
3805 end_buf, &iwe,
3806 IW_EV_UINT_LEN);
3807 if (IS_ERR(current_ev))
3808 goto unlock;
3809 }
3810
3811 memset(&iwe, 0, sizeof(iwe));
3812 iwe.cmd = IWEVCUSTOM;
3813 iwe.u.data.length = sprintf(buf, "tsf=%016llx",
3814 (unsigned long long)(ies->tsf));
3815 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
3816 &iwe, buf);
3817 if (IS_ERR(current_ev))
3818 goto unlock;
3819 memset(&iwe, 0, sizeof(iwe));
3820 iwe.cmd = IWEVCUSTOM;
3821 iwe.u.data.length = sprintf(buf, " Last beacon: %ums ago",
3822 elapsed_jiffies_msecs(bss->ts));
3823 current_ev = iwe_stream_add_point_check(info, current_ev,
3824 end_buf, &iwe, buf);
3825 if (IS_ERR(current_ev))
3826 goto unlock;
3827
3828 current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf);
3829
3830 unlock:
3831 rcu_read_unlock();
3832 return current_ev;
3833 }
3834
3835
ieee80211_scan_results(struct cfg80211_registered_device * rdev,struct iw_request_info * info,char * buf,size_t len)3836 static int ieee80211_scan_results(struct cfg80211_registered_device *rdev,
3837 struct iw_request_info *info,
3838 char *buf, size_t len)
3839 {
3840 char *current_ev = buf;
3841 char *end_buf = buf + len;
3842 struct cfg80211_internal_bss *bss;
3843 int err = 0;
3844
3845 spin_lock_bh(&rdev->bss_lock);
3846 cfg80211_bss_expire(rdev);
3847
3848 list_for_each_entry(bss, &rdev->bss_list, list) {
3849 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
3850 err = -E2BIG;
3851 break;
3852 }
3853 current_ev = ieee80211_bss(&rdev->wiphy, info, bss,
3854 current_ev, end_buf);
3855 if (IS_ERR(current_ev)) {
3856 err = PTR_ERR(current_ev);
3857 break;
3858 }
3859 }
3860 spin_unlock_bh(&rdev->bss_lock);
3861
3862 if (err)
3863 return err;
3864 return current_ev - buf;
3865 }
3866
3867
cfg80211_wext_giwscan(struct net_device * dev,struct iw_request_info * info,union iwreq_data * wrqu,char * extra)3868 int cfg80211_wext_giwscan(struct net_device *dev,
3869 struct iw_request_info *info,
3870 union iwreq_data *wrqu, char *extra)
3871 {
3872 struct iw_point *data = &wrqu->data;
3873 struct cfg80211_registered_device *rdev;
3874 int res;
3875
3876 if (!netif_running(dev))
3877 return -ENETDOWN;
3878
3879 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
3880
3881 if (IS_ERR(rdev))
3882 return PTR_ERR(rdev);
3883
3884 if (rdev->scan_req || rdev->scan_msg)
3885 return -EAGAIN;
3886
3887 res = ieee80211_scan_results(rdev, info, extra, data->length);
3888 data->length = 0;
3889 if (res >= 0) {
3890 data->length = res;
3891 res = 0;
3892 }
3893
3894 return res;
3895 }
3896 EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan);
3897 #endif
3898