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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) 2018-2021 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 "core.h"
24#include "nl80211.h"
25#include "wext-compat.h"
26#include "rdev-ops.h"
27
28/**
29 * DOC: BSS tree/list structure
30 *
31 * At the top level, the BSS list is kept in both a list in each
32 * registered device (@bss_list) as well as an RB-tree for faster
33 * lookup. In the RB-tree, entries can be looked up using their
34 * channel, MESHID, MESHCONF (for MBSSes) or channel, BSSID, SSID
35 * for other BSSes.
36 *
37 * Due to the possibility of hidden SSIDs, there's a second level
38 * structure, the "hidden_list" and "hidden_beacon_bss" pointer.
39 * The hidden_list connects all BSSes belonging to a single AP
40 * that has a hidden SSID, and connects beacon and probe response
41 * entries. For a probe response entry for a hidden SSID, the
42 * hidden_beacon_bss pointer points to the BSS struct holding the
43 * beacon's information.
44 *
45 * Reference counting is done for all these references except for
46 * the hidden_list, so that a beacon BSS struct that is otherwise
47 * not referenced has one reference for being on the bss_list and
48 * one for each probe response entry that points to it using the
49 * hidden_beacon_bss pointer. When a BSS struct that has such a
50 * pointer is get/put, the refcount update is also propagated to
51 * the referenced struct, this ensure that it cannot get removed
52 * while somebody is using the probe response version.
53 *
54 * Note that the hidden_beacon_bss pointer never changes, due to
55 * the reference counting. Therefore, no locking is needed for
56 * it.
57 *
58 * Also note that the hidden_beacon_bss pointer is only relevant
59 * if the driver uses something other than the IEs, e.g. private
60 * data stored in the BSS struct, since the beacon IEs are
61 * also linked into the probe response struct.
62 */
63
64/*
65 * Limit the number of BSS entries stored in mac80211. Each one is
66 * a bit over 4k at most, so this limits to roughly 4-5M of memory.
67 * If somebody wants to really attack this though, they'd likely
68 * use small beacons, and only one type of frame, limiting each of
69 * the entries to a much smaller size (in order to generate more
70 * entries in total, so overhead is bigger.)
71 */
72static int bss_entries_limit = 1000;
73module_param(bss_entries_limit, int, 0644);
74MODULE_PARM_DESC(bss_entries_limit,
75 "limit to number of scan BSS entries (per wiphy, default 1000)");
76
77#define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ)
78
79/**
80 * struct cfg80211_colocated_ap - colocated AP information
81 *
82 * @list: linked list to all colocated aPS
83 * @bssid: BSSID of the reported AP
84 * @ssid: SSID of the reported AP
85 * @ssid_len: length of the ssid
86 * @center_freq: frequency the reported AP is on
87 * @unsolicited_probe: the reported AP is part of an ESS, where all the APs
88 * that operate in the same channel as the reported AP and that might be
89 * detected by a STA receiving this frame, are transmitting unsolicited
90 * Probe Response frames every 20 TUs
91 * @oct_recommended: OCT is recommended to exchange MMPDUs with the reported AP
92 * @same_ssid: the reported AP has the same SSID as the reporting AP
93 * @multi_bss: the reported AP is part of a multiple BSSID set
94 * @transmitted_bssid: the reported AP is the transmitting BSSID
95 * @colocated_ess: all the APs that share the same ESS as the reported AP are
96 * colocated and can be discovered via legacy bands.
97 * @short_ssid_valid: short_ssid is valid and can be used
98 * @short_ssid: the short SSID for this SSID
99 */
100struct cfg80211_colocated_ap {
101 struct list_head list;
102 u8 bssid[ETH_ALEN];
103 u8 ssid[IEEE80211_MAX_SSID_LEN];
104 size_t ssid_len;
105 u32 short_ssid;
106 u32 center_freq;
107 u8 unsolicited_probe:1,
108 oct_recommended:1,
109 same_ssid:1,
110 multi_bss:1,
111 transmitted_bssid:1,
112 colocated_ess:1,
113 short_ssid_valid:1;
114};
115
116static void bss_free(struct cfg80211_internal_bss *bss)
117{
118 struct cfg80211_bss_ies *ies;
119
120 if (WARN_ON(atomic_read(&bss->hold)))
121 return;
122
123 ies = (void *)rcu_access_pointer(bss->pub.beacon_ies);
124 if (ies && !bss->pub.hidden_beacon_bss)
125 kfree_rcu(ies, rcu_head);
126 ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies);
127 if (ies)
128 kfree_rcu(ies, rcu_head);
129
130 /*
131 * This happens when the module is removed, it doesn't
132 * really matter any more save for completeness
133 */
134 if (!list_empty(&bss->hidden_list))
135 list_del(&bss->hidden_list);
136
137 kfree(bss);
138}
139
140static inline void bss_ref_get(struct cfg80211_registered_device *rdev,
141 struct cfg80211_internal_bss *bss)
142{
143 lockdep_assert_held(&rdev->bss_lock);
144
145 bss->refcount++;
146 if (bss->pub.hidden_beacon_bss) {
147 bss = container_of(bss->pub.hidden_beacon_bss,
148 struct cfg80211_internal_bss,
149 pub);
150 bss->refcount++;
151 }
152 if (bss->pub.transmitted_bss) {
153 bss = container_of(bss->pub.transmitted_bss,
154 struct cfg80211_internal_bss,
155 pub);
156 bss->refcount++;
157 }
158}
159
160static inline void bss_ref_put(struct cfg80211_registered_device *rdev,
161 struct cfg80211_internal_bss *bss)
162{
163 lockdep_assert_held(&rdev->bss_lock);
164
165 if (bss->pub.hidden_beacon_bss) {
166 struct cfg80211_internal_bss *hbss;
167 hbss = container_of(bss->pub.hidden_beacon_bss,
168 struct cfg80211_internal_bss,
169 pub);
170 hbss->refcount--;
171 if (hbss->refcount == 0)
172 bss_free(hbss);
173 }
174
175 if (bss->pub.transmitted_bss) {
176 struct cfg80211_internal_bss *tbss;
177
178 tbss = container_of(bss->pub.transmitted_bss,
179 struct cfg80211_internal_bss,
180 pub);
181 tbss->refcount--;
182 if (tbss->refcount == 0)
183 bss_free(tbss);
184 }
185
186 bss->refcount--;
187 if (bss->refcount == 0)
188 bss_free(bss);
189}
190
191static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev,
192 struct cfg80211_internal_bss *bss)
193{
194 lockdep_assert_held(&rdev->bss_lock);
195
196 if (!list_empty(&bss->hidden_list)) {
197 /*
198 * don't remove the beacon entry if it has
199 * probe responses associated with it
200 */
201 if (!bss->pub.hidden_beacon_bss)
202 return false;
203 /*
204 * if it's a probe response entry break its
205 * link to the other entries in the group
206 */
207 list_del_init(&bss->hidden_list);
208 }
209
210 list_del_init(&bss->list);
211 list_del_init(&bss->pub.nontrans_list);
212 rb_erase(&bss->rbn, &rdev->bss_tree);
213 rdev->bss_entries--;
214 WARN_ONCE((rdev->bss_entries == 0) ^ list_empty(&rdev->bss_list),
215 "rdev bss entries[%d]/list[empty:%d] corruption\n",
216 rdev->bss_entries, list_empty(&rdev->bss_list));
217 bss_ref_put(rdev, bss);
218 return true;
219}
220
221bool cfg80211_is_element_inherited(const struct element *elem,
222 const struct element *non_inherit_elem)
223{
224 u8 id_len, ext_id_len, i, loop_len, id;
225 const u8 *list;
226
227 if (elem->id == WLAN_EID_MULTIPLE_BSSID)
228 return false;
229
230 if (!non_inherit_elem || non_inherit_elem->datalen < 2)
231 return true;
232
233 /*
234 * non inheritance element format is:
235 * ext ID (56) | IDs list len | list | extension IDs list len | list
236 * Both lists are optional. Both lengths are mandatory.
237 * This means valid length is:
238 * elem_len = 1 (extension ID) + 2 (list len fields) + list lengths
239 */
240 id_len = non_inherit_elem->data[1];
241 if (non_inherit_elem->datalen < 3 + id_len)
242 return true;
243
244 ext_id_len = non_inherit_elem->data[2 + id_len];
245 if (non_inherit_elem->datalen < 3 + id_len + ext_id_len)
246 return true;
247
248 if (elem->id == WLAN_EID_EXTENSION) {
249 if (!ext_id_len)
250 return true;
251 loop_len = ext_id_len;
252 list = &non_inherit_elem->data[3 + id_len];
253 id = elem->data[0];
254 } else {
255 if (!id_len)
256 return true;
257 loop_len = id_len;
258 list = &non_inherit_elem->data[2];
259 id = elem->id;
260 }
261
262 for (i = 0; i < loop_len; i++) {
263 if (list[i] == id)
264 return false;
265 }
266
267 return true;
268}
269EXPORT_SYMBOL(cfg80211_is_element_inherited);
270
271static size_t cfg80211_gen_new_ie(const u8 *ie, size_t ielen,
272 const u8 *subelement, size_t subie_len,
273 u8 *new_ie, gfp_t gfp)
274{
275 u8 *pos, *tmp;
276 const u8 *tmp_old, *tmp_new;
277 const struct element *non_inherit_elem;
278 u8 *sub_copy;
279
280 /* copy subelement as we need to change its content to
281 * mark an ie after it is processed.
282 */
283 sub_copy = kmemdup(subelement, subie_len, gfp);
284 if (!sub_copy)
285 return 0;
286
287 pos = &new_ie[0];
288
289 /* set new ssid */
290 tmp_new = cfg80211_find_ie(WLAN_EID_SSID, sub_copy, subie_len);
291 if (tmp_new) {
292 memcpy(pos, tmp_new, tmp_new[1] + 2);
293 pos += (tmp_new[1] + 2);
294 }
295
296 /* get non inheritance list if exists */
297 non_inherit_elem =
298 cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE,
299 sub_copy, subie_len);
300
301 /* go through IEs in ie (skip SSID) and subelement,
302 * merge them into new_ie
303 */
304 tmp_old = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen);
305 tmp_old = (tmp_old) ? tmp_old + tmp_old[1] + 2 : ie;
306
307 while (tmp_old + tmp_old[1] + 2 - ie <= ielen) {
308 if (tmp_old[0] == 0) {
309 tmp_old++;
310 continue;
311 }
312
313 if (tmp_old[0] == WLAN_EID_EXTENSION)
314 tmp = (u8 *)cfg80211_find_ext_ie(tmp_old[2], sub_copy,
315 subie_len);
316 else
317 tmp = (u8 *)cfg80211_find_ie(tmp_old[0], sub_copy,
318 subie_len);
319
320 if (!tmp) {
321 const struct element *old_elem = (void *)tmp_old;
322
323 /* ie in old ie but not in subelement */
324 if (cfg80211_is_element_inherited(old_elem,
325 non_inherit_elem)) {
326 memcpy(pos, tmp_old, tmp_old[1] + 2);
327 pos += tmp_old[1] + 2;
328 }
329 } else {
330 /* ie in transmitting ie also in subelement,
331 * copy from subelement and flag the ie in subelement
332 * as copied (by setting eid field to WLAN_EID_SSID,
333 * which is skipped anyway).
334 * For vendor ie, compare OUI + type + subType to
335 * determine if they are the same ie.
336 */
337 if (tmp_old[0] == WLAN_EID_VENDOR_SPECIFIC) {
338 if (!memcmp(tmp_old + 2, tmp + 2, 5)) {
339 /* same vendor ie, copy from
340 * subelement
341 */
342 memcpy(pos, tmp, tmp[1] + 2);
343 pos += tmp[1] + 2;
344 tmp[0] = WLAN_EID_SSID;
345 } else {
346 memcpy(pos, tmp_old, tmp_old[1] + 2);
347 pos += tmp_old[1] + 2;
348 }
349 } else {
350 /* copy ie from subelement into new ie */
351 memcpy(pos, tmp, tmp[1] + 2);
352 pos += tmp[1] + 2;
353 tmp[0] = WLAN_EID_SSID;
354 }
355 }
356
357 if (tmp_old + tmp_old[1] + 2 - ie == ielen)
358 break;
359
360 tmp_old += tmp_old[1] + 2;
361 }
362
363 /* go through subelement again to check if there is any ie not
364 * copied to new ie, skip ssid, capability, bssid-index ie
365 */
366 tmp_new = sub_copy;
367 while (tmp_new + tmp_new[1] + 2 - sub_copy <= subie_len) {
368 if (!(tmp_new[0] == WLAN_EID_NON_TX_BSSID_CAP ||
369 tmp_new[0] == WLAN_EID_SSID)) {
370 memcpy(pos, tmp_new, tmp_new[1] + 2);
371 pos += tmp_new[1] + 2;
372 }
373 if (tmp_new + tmp_new[1] + 2 - sub_copy == subie_len)
374 break;
375 tmp_new += tmp_new[1] + 2;
376 }
377
378 kfree(sub_copy);
379 return pos - new_ie;
380}
381
382static bool is_bss(struct cfg80211_bss *a, const u8 *bssid,
383 const u8 *ssid, size_t ssid_len)
384{
385 const struct cfg80211_bss_ies *ies;
386 const u8 *ssidie;
387
388 if (bssid && !ether_addr_equal(a->bssid, bssid))
389 return false;
390
391 if (!ssid)
392 return true;
393
394 ies = rcu_access_pointer(a->ies);
395 if (!ies)
396 return false;
397 ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
398 if (!ssidie)
399 return false;
400 if (ssidie[1] != ssid_len)
401 return false;
402 return memcmp(ssidie + 2, ssid, ssid_len) == 0;
403}
404
405static int
406cfg80211_add_nontrans_list(struct cfg80211_bss *trans_bss,
407 struct cfg80211_bss *nontrans_bss)
408{
409 const u8 *ssid;
410 size_t ssid_len;
411 struct cfg80211_bss *bss = NULL;
412
413 rcu_read_lock();
414 ssid = ieee80211_bss_get_ie(nontrans_bss, WLAN_EID_SSID);
415 if (!ssid) {
416 rcu_read_unlock();
417 return -EINVAL;
418 }
419 ssid_len = ssid[1];
420 ssid = ssid + 2;
421 rcu_read_unlock();
422
423 /* check if nontrans_bss is in the list */
424 list_for_each_entry(bss, &trans_bss->nontrans_list, nontrans_list) {
425 if (is_bss(bss, nontrans_bss->bssid, ssid, ssid_len))
426 return 0;
427 }
428
429 /* add to the list */
430 list_add_tail(&nontrans_bss->nontrans_list, &trans_bss->nontrans_list);
431 return 0;
432}
433
434static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev,
435 unsigned long expire_time)
436{
437 struct cfg80211_internal_bss *bss, *tmp;
438 bool expired = false;
439
440 lockdep_assert_held(&rdev->bss_lock);
441
442 list_for_each_entry_safe(bss, tmp, &rdev->bss_list, list) {
443 if (atomic_read(&bss->hold))
444 continue;
445 if (!time_after(expire_time, bss->ts))
446 continue;
447
448 if (__cfg80211_unlink_bss(rdev, bss))
449 expired = true;
450 }
451
452 if (expired)
453 rdev->bss_generation++;
454}
455
456static bool cfg80211_bss_expire_oldest(struct cfg80211_registered_device *rdev)
457{
458 struct cfg80211_internal_bss *bss, *oldest = NULL;
459 bool ret;
460
461 lockdep_assert_held(&rdev->bss_lock);
462
463 list_for_each_entry(bss, &rdev->bss_list, list) {
464 if (atomic_read(&bss->hold))
465 continue;
466
467 if (!list_empty(&bss->hidden_list) &&
468 !bss->pub.hidden_beacon_bss)
469 continue;
470
471 if (oldest && time_before(oldest->ts, bss->ts))
472 continue;
473 oldest = bss;
474 }
475
476 if (WARN_ON(!oldest))
477 return false;
478
479 /*
480 * The callers make sure to increase rdev->bss_generation if anything
481 * gets removed (and a new entry added), so there's no need to also do
482 * it here.
483 */
484
485 ret = __cfg80211_unlink_bss(rdev, oldest);
486 WARN_ON(!ret);
487 return ret;
488}
489
490static u8 cfg80211_parse_bss_param(u8 data,
491 struct cfg80211_colocated_ap *coloc_ap)
492{
493 coloc_ap->oct_recommended =
494 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_OCT_RECOMMENDED);
495 coloc_ap->same_ssid =
496 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_SAME_SSID);
497 coloc_ap->multi_bss =
498 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_MULTI_BSSID);
499 coloc_ap->transmitted_bssid =
500 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_TRANSMITTED_BSSID);
501 coloc_ap->unsolicited_probe =
502 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_PROBE_ACTIVE);
503 coloc_ap->colocated_ess =
504 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_COLOC_ESS);
505
506 return u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_COLOC_AP);
507}
508
509static int cfg80211_calc_short_ssid(const struct cfg80211_bss_ies *ies,
510 const struct element **elem, u32 *s_ssid)
511{
512
513 *elem = cfg80211_find_elem(WLAN_EID_SSID, ies->data, ies->len);
514 if (!*elem || (*elem)->datalen > IEEE80211_MAX_SSID_LEN)
515 return -EINVAL;
516
517 *s_ssid = ~crc32_le(~0, (*elem)->data, (*elem)->datalen);
518 return 0;
519}
520
521static void cfg80211_free_coloc_ap_list(struct list_head *coloc_ap_list)
522{
523 struct cfg80211_colocated_ap *ap, *tmp_ap;
524
525 list_for_each_entry_safe(ap, tmp_ap, coloc_ap_list, list) {
526 list_del(&ap->list);
527 kfree(ap);
528 }
529}
530
531static int cfg80211_parse_ap_info(struct cfg80211_colocated_ap *entry,
532 const u8 *pos, u8 length,
533 const struct element *ssid_elem,
534 int s_ssid_tmp)
535{
536 /* skip the TBTT offset */
537 pos++;
538
539 memcpy(entry->bssid, pos, ETH_ALEN);
540 pos += ETH_ALEN;
541
542 if (length == IEEE80211_TBTT_INFO_OFFSET_BSSID_SSSID_BSS_PARAM) {
543 memcpy(&entry->short_ssid, pos,
544 sizeof(entry->short_ssid));
545 entry->short_ssid_valid = true;
546 pos += 4;
547 }
548
549 /* skip non colocated APs */
550 if (!cfg80211_parse_bss_param(*pos, entry))
551 return -EINVAL;
552 pos++;
553
554 if (length == IEEE80211_TBTT_INFO_OFFSET_BSSID_BSS_PARAM) {
555 /*
556 * no information about the short ssid. Consider the entry valid
557 * for now. It would later be dropped in case there are explicit
558 * SSIDs that need to be matched
559 */
560 if (!entry->same_ssid)
561 return 0;
562 }
563
564 if (entry->same_ssid) {
565 entry->short_ssid = s_ssid_tmp;
566 entry->short_ssid_valid = true;
567
568 /*
569 * This is safe because we validate datalen in
570 * cfg80211_parse_colocated_ap(), before calling this
571 * function.
572 */
573 memcpy(&entry->ssid, &ssid_elem->data,
574 ssid_elem->datalen);
575 entry->ssid_len = ssid_elem->datalen;
576 }
577 return 0;
578}
579
580static int cfg80211_parse_colocated_ap(const struct cfg80211_bss_ies *ies,
581 struct list_head *list)
582{
583 struct ieee80211_neighbor_ap_info *ap_info;
584 const struct element *elem, *ssid_elem;
585 const u8 *pos, *end;
586 u32 s_ssid_tmp;
587 int n_coloc = 0, ret;
588 LIST_HEAD(ap_list);
589
590 elem = cfg80211_find_elem(WLAN_EID_REDUCED_NEIGHBOR_REPORT, ies->data,
591 ies->len);
592 if (!elem)
593 return 0;
594
595 pos = elem->data;
596 end = pos + elem->datalen;
597
598 ret = cfg80211_calc_short_ssid(ies, &ssid_elem, &s_ssid_tmp);
599 if (ret)
600 return ret;
601
602 /* RNR IE may contain more than one NEIGHBOR_AP_INFO */
603 while (pos + sizeof(*ap_info) <= end) {
604 enum nl80211_band band;
605 int freq;
606 u8 length, i, count;
607
608 ap_info = (void *)pos;
609 count = u8_get_bits(ap_info->tbtt_info_hdr,
610 IEEE80211_AP_INFO_TBTT_HDR_COUNT) + 1;
611 length = ap_info->tbtt_info_len;
612
613 pos += sizeof(*ap_info);
614
615 if (!ieee80211_operating_class_to_band(ap_info->op_class,
616 &band))
617 break;
618
619 freq = ieee80211_channel_to_frequency(ap_info->channel, band);
620
621 if (end - pos < count * length)
622 break;
623
624 /*
625 * TBTT info must include bss param + BSSID +
626 * (short SSID or same_ssid bit to be set).
627 * ignore other options, and move to the
628 * next AP info
629 */
630 if (band != NL80211_BAND_6GHZ ||
631 (length != IEEE80211_TBTT_INFO_OFFSET_BSSID_BSS_PARAM &&
632 length < IEEE80211_TBTT_INFO_OFFSET_BSSID_SSSID_BSS_PARAM)) {
633 pos += count * length;
634 continue;
635 }
636
637 for (i = 0; i < count; i++) {
638 struct cfg80211_colocated_ap *entry;
639
640 entry = kzalloc(sizeof(*entry) + IEEE80211_MAX_SSID_LEN,
641 GFP_ATOMIC);
642
643 if (!entry)
644 break;
645
646 entry->center_freq = freq;
647
648 if (!cfg80211_parse_ap_info(entry, pos, length,
649 ssid_elem, s_ssid_tmp)) {
650 n_coloc++;
651 list_add_tail(&entry->list, &ap_list);
652 } else {
653 kfree(entry);
654 }
655
656 pos += length;
657 }
658 }
659
660 if (pos != end) {
661 cfg80211_free_coloc_ap_list(&ap_list);
662 return 0;
663 }
664
665 list_splice_tail(&ap_list, list);
666 return n_coloc;
667}
668
669static void cfg80211_scan_req_add_chan(struct cfg80211_scan_request *request,
670 struct ieee80211_channel *chan,
671 bool add_to_6ghz)
672{
673 int i;
674 u32 n_channels = request->n_channels;
675 struct cfg80211_scan_6ghz_params *params =
676 &request->scan_6ghz_params[request->n_6ghz_params];
677
678 for (i = 0; i < n_channels; i++) {
679 if (request->channels[i] == chan) {
680 if (add_to_6ghz)
681 params->channel_idx = i;
682 return;
683 }
684 }
685
686 request->channels[n_channels] = chan;
687 if (add_to_6ghz)
688 request->scan_6ghz_params[request->n_6ghz_params].channel_idx =
689 n_channels;
690
691 request->n_channels++;
692}
693
694static bool cfg80211_find_ssid_match(struct cfg80211_colocated_ap *ap,
695 struct cfg80211_scan_request *request)
696{
697 int i;
698 u32 s_ssid;
699
700 for (i = 0; i < request->n_ssids; i++) {
701 /* wildcard ssid in the scan request */
702 if (!request->ssids[i].ssid_len)
703 return true;
704
705 if (ap->ssid_len &&
706 ap->ssid_len == request->ssids[i].ssid_len) {
707 if (!memcmp(request->ssids[i].ssid, ap->ssid,
708 ap->ssid_len))
709 return true;
710 } else if (ap->short_ssid_valid) {
711 s_ssid = ~crc32_le(~0, request->ssids[i].ssid,
712 request->ssids[i].ssid_len);
713
714 if (ap->short_ssid == s_ssid)
715 return true;
716 }
717 }
718
719 return false;
720}
721
722static int cfg80211_scan_6ghz(struct cfg80211_registered_device *rdev)
723{
724 u8 i;
725 struct cfg80211_colocated_ap *ap;
726 int n_channels, count = 0, err;
727 struct cfg80211_scan_request *request, *rdev_req = rdev->scan_req;
728 LIST_HEAD(coloc_ap_list);
729 bool need_scan_psc = true;
730 const struct ieee80211_sband_iftype_data *iftd;
731
732 rdev_req->scan_6ghz = true;
733
734 if (!rdev->wiphy.bands[NL80211_BAND_6GHZ])
735 return -EOPNOTSUPP;
736
737 iftd = ieee80211_get_sband_iftype_data(rdev->wiphy.bands[NL80211_BAND_6GHZ],
738 rdev_req->wdev->iftype);
739 if (!iftd || !iftd->he_cap.has_he)
740 return -EOPNOTSUPP;
741
742 n_channels = rdev->wiphy.bands[NL80211_BAND_6GHZ]->n_channels;
743
744 if (rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ) {
745 struct cfg80211_internal_bss *intbss;
746
747 spin_lock_bh(&rdev->bss_lock);
748 list_for_each_entry(intbss, &rdev->bss_list, list) {
749 struct cfg80211_bss *res = &intbss->pub;
750 const struct cfg80211_bss_ies *ies;
751
752 ies = rcu_access_pointer(res->ies);
753 count += cfg80211_parse_colocated_ap(ies,
754 &coloc_ap_list);
755 }
756 spin_unlock_bh(&rdev->bss_lock);
757 }
758
759 request = kzalloc(struct_size(request, channels, n_channels) +
760 sizeof(*request->scan_6ghz_params) * count +
761 sizeof(*request->ssids) * rdev_req->n_ssids,
762 GFP_KERNEL);
763 if (!request) {
764 cfg80211_free_coloc_ap_list(&coloc_ap_list);
765 return -ENOMEM;
766 }
767
768 *request = *rdev_req;
769 request->n_channels = 0;
770 request->scan_6ghz_params =
771 (void *)&request->channels[n_channels];
772
773 /*
774 * PSC channels should not be scanned in case of direct scan with 1 SSID
775 * and at least one of the reported co-located APs with same SSID
776 * indicating that all APs in the same ESS are co-located
777 */
778 if (count && request->n_ssids == 1 && request->ssids[0].ssid_len) {
779 list_for_each_entry(ap, &coloc_ap_list, list) {
780 if (ap->colocated_ess &&
781 cfg80211_find_ssid_match(ap, request)) {
782 need_scan_psc = false;
783 break;
784 }
785 }
786 }
787
788 /*
789 * add to the scan request the channels that need to be scanned
790 * regardless of the collocated APs (PSC channels or all channels
791 * in case that NL80211_SCAN_FLAG_COLOCATED_6GHZ is not set)
792 */
793 for (i = 0; i < rdev_req->n_channels; i++) {
794 if (rdev_req->channels[i]->band == NL80211_BAND_6GHZ &&
795 ((need_scan_psc &&
796 cfg80211_channel_is_psc(rdev_req->channels[i])) ||
797 !(rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ))) {
798 cfg80211_scan_req_add_chan(request,
799 rdev_req->channels[i],
800 false);
801 }
802 }
803
804 if (!(rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ))
805 goto skip;
806
807 list_for_each_entry(ap, &coloc_ap_list, list) {
808 bool found = false;
809 struct cfg80211_scan_6ghz_params *scan_6ghz_params =
810 &request->scan_6ghz_params[request->n_6ghz_params];
811 struct ieee80211_channel *chan =
812 ieee80211_get_channel(&rdev->wiphy, ap->center_freq);
813
814 if (!chan || chan->flags & IEEE80211_CHAN_DISABLED)
815 continue;
816
817 for (i = 0; i < rdev_req->n_channels; i++) {
818 if (rdev_req->channels[i] == chan)
819 found = true;
820 }
821
822 if (!found)
823 continue;
824
825 if (request->n_ssids > 0 &&
826 !cfg80211_find_ssid_match(ap, request))
827 continue;
828
829 cfg80211_scan_req_add_chan(request, chan, true);
830 memcpy(scan_6ghz_params->bssid, ap->bssid, ETH_ALEN);
831 scan_6ghz_params->short_ssid = ap->short_ssid;
832 scan_6ghz_params->short_ssid_valid = ap->short_ssid_valid;
833 scan_6ghz_params->unsolicited_probe = ap->unsolicited_probe;
834
835 /*
836 * If a PSC channel is added to the scan and 'need_scan_psc' is
837 * set to false, then all the APs that the scan logic is
838 * interested with on the channel are collocated and thus there
839 * is no need to perform the initial PSC channel listen.
840 */
841 if (cfg80211_channel_is_psc(chan) && !need_scan_psc)
842 scan_6ghz_params->psc_no_listen = true;
843
844 request->n_6ghz_params++;
845 }
846
847skip:
848 cfg80211_free_coloc_ap_list(&coloc_ap_list);
849
850 if (request->n_channels) {
851 struct cfg80211_scan_request *old = rdev->int_scan_req;
852 rdev->int_scan_req = request;
853
854 /*
855 * Add the ssids from the parent scan request to the new scan
856 * request, so the driver would be able to use them in its
857 * probe requests to discover hidden APs on PSC channels.
858 */
859 request->ssids = (void *)&request->channels[request->n_channels];
860 request->n_ssids = rdev_req->n_ssids;
861 memcpy(request->ssids, rdev_req->ssids, sizeof(*request->ssids) *
862 request->n_ssids);
863
864 /*
865 * If this scan follows a previous scan, save the scan start
866 * info from the first part of the scan
867 */
868 if (old)
869 rdev->int_scan_req->info = old->info;
870
871 err = rdev_scan(rdev, request);
872 if (err) {
873 rdev->int_scan_req = old;
874 kfree(request);
875 } else {
876 kfree(old);
877 }
878
879 return err;
880 }
881
882 kfree(request);
883 return -EINVAL;
884}
885
886int cfg80211_scan(struct cfg80211_registered_device *rdev)
887{
888 struct cfg80211_scan_request *request;
889 struct cfg80211_scan_request *rdev_req = rdev->scan_req;
890 u32 n_channels = 0, idx, i;
891
892 if (!(rdev->wiphy.flags & WIPHY_FLAG_SPLIT_SCAN_6GHZ))
893 return rdev_scan(rdev, rdev_req);
894
895 for (i = 0; i < rdev_req->n_channels; i++) {
896 if (rdev_req->channels[i]->band != NL80211_BAND_6GHZ)
897 n_channels++;
898 }
899
900 if (!n_channels)
901 return cfg80211_scan_6ghz(rdev);
902
903 request = kzalloc(struct_size(request, channels, n_channels),
904 GFP_KERNEL);
905 if (!request)
906 return -ENOMEM;
907
908 *request = *rdev_req;
909 request->n_channels = n_channels;
910
911 for (i = idx = 0; i < rdev_req->n_channels; i++) {
912 if (rdev_req->channels[i]->band != NL80211_BAND_6GHZ)
913 request->channels[idx++] = rdev_req->channels[i];
914 }
915
916 rdev_req->scan_6ghz = false;
917 rdev->int_scan_req = request;
918 return rdev_scan(rdev, request);
919}
920
921void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev,
922 bool send_message)
923{
924 struct cfg80211_scan_request *request, *rdev_req;
925 struct wireless_dev *wdev;
926 struct sk_buff *msg;
927#ifdef CONFIG_CFG80211_WEXT
928 union iwreq_data wrqu;
929#endif
930
931 lockdep_assert_held(&rdev->wiphy.mtx);
932
933 if (rdev->scan_msg) {
934 nl80211_send_scan_msg(rdev, rdev->scan_msg);
935 rdev->scan_msg = NULL;
936 return;
937 }
938
939 rdev_req = rdev->scan_req;
940 if (!rdev_req)
941 return;
942
943 wdev = rdev_req->wdev;
944 request = rdev->int_scan_req ? rdev->int_scan_req : rdev_req;
945
946 if (wdev_running(wdev) &&
947 (rdev->wiphy.flags & WIPHY_FLAG_SPLIT_SCAN_6GHZ) &&
948 !rdev_req->scan_6ghz && !request->info.aborted &&
949 !cfg80211_scan_6ghz(rdev))
950 return;
951
952 /*
953 * This must be before sending the other events!
954 * Otherwise, wpa_supplicant gets completely confused with
955 * wext events.
956 */
957 if (wdev->netdev)
958 cfg80211_sme_scan_done(wdev->netdev);
959
960 if (!request->info.aborted &&
961 request->flags & NL80211_SCAN_FLAG_FLUSH) {
962 /* flush entries from previous scans */
963 spin_lock_bh(&rdev->bss_lock);
964 __cfg80211_bss_expire(rdev, request->scan_start);
965 spin_unlock_bh(&rdev->bss_lock);
966 }
967
968 msg = nl80211_build_scan_msg(rdev, wdev, request->info.aborted);
969
970#ifdef CONFIG_CFG80211_WEXT
971 if (wdev->netdev && !request->info.aborted) {
972 memset(&wrqu, 0, sizeof(wrqu));
973
974 wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL);
975 }
976#endif
977
978 if (wdev->netdev)
979 dev_put(wdev->netdev);
980
981 kfree(rdev->int_scan_req);
982 rdev->int_scan_req = NULL;
983
984 kfree(rdev->scan_req);
985 rdev->scan_req = NULL;
986
987 if (!send_message)
988 rdev->scan_msg = msg;
989 else
990 nl80211_send_scan_msg(rdev, msg);
991}
992
993void __cfg80211_scan_done(struct work_struct *wk)
994{
995 struct cfg80211_registered_device *rdev;
996
997 rdev = container_of(wk, struct cfg80211_registered_device,
998 scan_done_wk);
999
1000 wiphy_lock(&rdev->wiphy);
1001 ___cfg80211_scan_done(rdev, true);
1002 wiphy_unlock(&rdev->wiphy);
1003}
1004
1005void cfg80211_scan_done(struct cfg80211_scan_request *request,
1006 struct cfg80211_scan_info *info)
1007{
1008 struct cfg80211_scan_info old_info = request->info;
1009
1010 trace_cfg80211_scan_done(request, info);
1011 WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req &&
1012 request != wiphy_to_rdev(request->wiphy)->int_scan_req);
1013
1014 request->info = *info;
1015
1016 /*
1017 * In case the scan is split, the scan_start_tsf and tsf_bssid should
1018 * be of the first part. In such a case old_info.scan_start_tsf should
1019 * be non zero.
1020 */
1021 if (request->scan_6ghz && old_info.scan_start_tsf) {
1022 request->info.scan_start_tsf = old_info.scan_start_tsf;
1023 memcpy(request->info.tsf_bssid, old_info.tsf_bssid,
1024 sizeof(request->info.tsf_bssid));
1025 }
1026
1027 request->notified = true;
1028 queue_work(cfg80211_wq, &wiphy_to_rdev(request->wiphy)->scan_done_wk);
1029}
1030EXPORT_SYMBOL(cfg80211_scan_done);
1031
1032void cfg80211_add_sched_scan_req(struct cfg80211_registered_device *rdev,
1033 struct cfg80211_sched_scan_request *req)
1034{
1035 lockdep_assert_held(&rdev->wiphy.mtx);
1036
1037 list_add_rcu(&req->list, &rdev->sched_scan_req_list);
1038}
1039
1040static void cfg80211_del_sched_scan_req(struct cfg80211_registered_device *rdev,
1041 struct cfg80211_sched_scan_request *req)
1042{
1043 lockdep_assert_held(&rdev->wiphy.mtx);
1044
1045 list_del_rcu(&req->list);
1046 kfree_rcu(req, rcu_head);
1047}
1048
1049static struct cfg80211_sched_scan_request *
1050cfg80211_find_sched_scan_req(struct cfg80211_registered_device *rdev, u64 reqid)
1051{
1052 struct cfg80211_sched_scan_request *pos;
1053
1054 list_for_each_entry_rcu(pos, &rdev->sched_scan_req_list, list,
1055 lockdep_is_held(&rdev->wiphy.mtx)) {
1056 if (pos->reqid == reqid)
1057 return pos;
1058 }
1059 return NULL;
1060}
1061
1062/*
1063 * Determines if a scheduled scan request can be handled. When a legacy
1064 * scheduled scan is running no other scheduled scan is allowed regardless
1065 * whether the request is for legacy or multi-support scan. When a multi-support
1066 * scheduled scan is running a request for legacy scan is not allowed. In this
1067 * case a request for multi-support scan can be handled if resources are
1068 * available, ie. struct wiphy::max_sched_scan_reqs limit is not yet reached.
1069 */
1070int cfg80211_sched_scan_req_possible(struct cfg80211_registered_device *rdev,
1071 bool want_multi)
1072{
1073 struct cfg80211_sched_scan_request *pos;
1074 int i = 0;
1075
1076 list_for_each_entry(pos, &rdev->sched_scan_req_list, list) {
1077 /* request id zero means legacy in progress */
1078 if (!i && !pos->reqid)
1079 return -EINPROGRESS;
1080 i++;
1081 }
1082
1083 if (i) {
1084 /* no legacy allowed when multi request(s) are active */
1085 if (!want_multi)
1086 return -EINPROGRESS;
1087
1088 /* resource limit reached */
1089 if (i == rdev->wiphy.max_sched_scan_reqs)
1090 return -ENOSPC;
1091 }
1092 return 0;
1093}
1094
1095void cfg80211_sched_scan_results_wk(struct work_struct *work)
1096{
1097 struct cfg80211_registered_device *rdev;
1098 struct cfg80211_sched_scan_request *req, *tmp;
1099
1100 rdev = container_of(work, struct cfg80211_registered_device,
1101 sched_scan_res_wk);
1102
1103 wiphy_lock(&rdev->wiphy);
1104 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
1105 if (req->report_results) {
1106 req->report_results = false;
1107 if (req->flags & NL80211_SCAN_FLAG_FLUSH) {
1108 /* flush entries from previous scans */
1109 spin_lock_bh(&rdev->bss_lock);
1110 __cfg80211_bss_expire(rdev, req->scan_start);
1111 spin_unlock_bh(&rdev->bss_lock);
1112 req->scan_start = jiffies;
1113 }
1114 nl80211_send_sched_scan(req,
1115 NL80211_CMD_SCHED_SCAN_RESULTS);
1116 }
1117 }
1118 wiphy_unlock(&rdev->wiphy);
1119}
1120
1121void cfg80211_sched_scan_results(struct wiphy *wiphy, u64 reqid)
1122{
1123 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1124 struct cfg80211_sched_scan_request *request;
1125
1126 trace_cfg80211_sched_scan_results(wiphy, reqid);
1127 /* ignore if we're not scanning */
1128
1129 rcu_read_lock();
1130 request = cfg80211_find_sched_scan_req(rdev, reqid);
1131 if (request) {
1132 request->report_results = true;
1133 queue_work(cfg80211_wq, &rdev->sched_scan_res_wk);
1134 }
1135 rcu_read_unlock();
1136}
1137EXPORT_SYMBOL(cfg80211_sched_scan_results);
1138
1139void cfg80211_sched_scan_stopped_locked(struct wiphy *wiphy, u64 reqid)
1140{
1141 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1142
1143 lockdep_assert_held(&wiphy->mtx);
1144
1145 trace_cfg80211_sched_scan_stopped(wiphy, reqid);
1146
1147 __cfg80211_stop_sched_scan(rdev, reqid, true);
1148}
1149EXPORT_SYMBOL(cfg80211_sched_scan_stopped_locked);
1150
1151void cfg80211_sched_scan_stopped(struct wiphy *wiphy, u64 reqid)
1152{
1153 wiphy_lock(wiphy);
1154 cfg80211_sched_scan_stopped_locked(wiphy, reqid);
1155 wiphy_unlock(wiphy);
1156}
1157EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
1158
1159int cfg80211_stop_sched_scan_req(struct cfg80211_registered_device *rdev,
1160 struct cfg80211_sched_scan_request *req,
1161 bool driver_initiated)
1162{
1163 lockdep_assert_held(&rdev->wiphy.mtx);
1164
1165 if (!driver_initiated) {
1166 int err = rdev_sched_scan_stop(rdev, req->dev, req->reqid);
1167 if (err)
1168 return err;
1169 }
1170
1171 nl80211_send_sched_scan(req, NL80211_CMD_SCHED_SCAN_STOPPED);
1172
1173 cfg80211_del_sched_scan_req(rdev, req);
1174
1175 return 0;
1176}
1177
1178int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
1179 u64 reqid, bool driver_initiated)
1180{
1181 struct cfg80211_sched_scan_request *sched_scan_req;
1182
1183 lockdep_assert_held(&rdev->wiphy.mtx);
1184
1185 sched_scan_req = cfg80211_find_sched_scan_req(rdev, reqid);
1186 if (!sched_scan_req)
1187 return -ENOENT;
1188
1189 return cfg80211_stop_sched_scan_req(rdev, sched_scan_req,
1190 driver_initiated);
1191}
1192
1193void cfg80211_bss_age(struct cfg80211_registered_device *rdev,
1194 unsigned long age_secs)
1195{
1196 struct cfg80211_internal_bss *bss;
1197 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
1198
1199 spin_lock_bh(&rdev->bss_lock);
1200 list_for_each_entry(bss, &rdev->bss_list, list)
1201 bss->ts -= age_jiffies;
1202 spin_unlock_bh(&rdev->bss_lock);
1203}
1204
1205void cfg80211_bss_expire(struct cfg80211_registered_device *rdev)
1206{
1207 __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE);
1208}
1209
1210void cfg80211_bss_flush(struct wiphy *wiphy)
1211{
1212 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1213
1214 spin_lock_bh(&rdev->bss_lock);
1215 __cfg80211_bss_expire(rdev, jiffies);
1216 spin_unlock_bh(&rdev->bss_lock);
1217}
1218EXPORT_SYMBOL(cfg80211_bss_flush);
1219
1220const struct element *
1221cfg80211_find_elem_match(u8 eid, const u8 *ies, unsigned int len,
1222 const u8 *match, unsigned int match_len,
1223 unsigned int match_offset)
1224{
1225 const struct element *elem;
1226
1227 for_each_element_id(elem, eid, ies, len) {
1228 if (elem->datalen >= match_offset + match_len &&
1229 !memcmp(elem->data + match_offset, match, match_len))
1230 return elem;
1231 }
1232
1233 return NULL;
1234}
1235EXPORT_SYMBOL(cfg80211_find_elem_match);
1236
1237const struct element *cfg80211_find_vendor_elem(unsigned int oui, int oui_type,
1238 const u8 *ies,
1239 unsigned int len)
1240{
1241 const struct element *elem;
1242 u8 match[] = { oui >> 16, oui >> 8, oui, oui_type };
1243 int match_len = (oui_type < 0) ? 3 : sizeof(match);
1244
1245 if (WARN_ON(oui_type > 0xff))
1246 return NULL;
1247
1248 elem = cfg80211_find_elem_match(WLAN_EID_VENDOR_SPECIFIC, ies, len,
1249 match, match_len, 0);
1250
1251 if (!elem || elem->datalen < 4)
1252 return NULL;
1253
1254 return elem;
1255}
1256EXPORT_SYMBOL(cfg80211_find_vendor_elem);
1257
1258/**
1259 * enum bss_compare_mode - BSS compare mode
1260 * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find)
1261 * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode
1262 * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode
1263 */
1264enum bss_compare_mode {
1265 BSS_CMP_REGULAR,
1266 BSS_CMP_HIDE_ZLEN,
1267 BSS_CMP_HIDE_NUL,
1268};
1269
1270static int cmp_bss(struct cfg80211_bss *a,
1271 struct cfg80211_bss *b,
1272 enum bss_compare_mode mode)
1273{
1274 const struct cfg80211_bss_ies *a_ies, *b_ies;
1275 const u8 *ie1 = NULL;
1276 const u8 *ie2 = NULL;
1277 int i, r;
1278
1279 if (a->channel != b->channel)
1280 return b->channel->center_freq - a->channel->center_freq;
1281
1282 a_ies = rcu_access_pointer(a->ies);
1283 if (!a_ies)
1284 return -1;
1285 b_ies = rcu_access_pointer(b->ies);
1286 if (!b_ies)
1287 return 1;
1288
1289 if (WLAN_CAPABILITY_IS_STA_BSS(a->capability))
1290 ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID,
1291 a_ies->data, a_ies->len);
1292 if (WLAN_CAPABILITY_IS_STA_BSS(b->capability))
1293 ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID,
1294 b_ies->data, b_ies->len);
1295 if (ie1 && ie2) {
1296 int mesh_id_cmp;
1297
1298 if (ie1[1] == ie2[1])
1299 mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]);
1300 else
1301 mesh_id_cmp = ie2[1] - ie1[1];
1302
1303 ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
1304 a_ies->data, a_ies->len);
1305 ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
1306 b_ies->data, b_ies->len);
1307 if (ie1 && ie2) {
1308 if (mesh_id_cmp)
1309 return mesh_id_cmp;
1310 if (ie1[1] != ie2[1])
1311 return ie2[1] - ie1[1];
1312 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
1313 }
1314 }
1315
1316 r = memcmp(a->bssid, b->bssid, sizeof(a->bssid));
1317 if (r)
1318 return r;
1319
1320 ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len);
1321 ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len);
1322
1323 if (!ie1 && !ie2)
1324 return 0;
1325
1326 /*
1327 * Note that with "hide_ssid", the function returns a match if
1328 * the already-present BSS ("b") is a hidden SSID beacon for
1329 * the new BSS ("a").
1330 */
1331
1332 /* sort missing IE before (left of) present IE */
1333 if (!ie1)
1334 return -1;
1335 if (!ie2)
1336 return 1;
1337
1338 switch (mode) {
1339 case BSS_CMP_HIDE_ZLEN:
1340 /*
1341 * In ZLEN mode we assume the BSS entry we're
1342 * looking for has a zero-length SSID. So if
1343 * the one we're looking at right now has that,
1344 * return 0. Otherwise, return the difference
1345 * in length, but since we're looking for the
1346 * 0-length it's really equivalent to returning
1347 * the length of the one we're looking at.
1348 *
1349 * No content comparison is needed as we assume
1350 * the content length is zero.
1351 */
1352 return ie2[1];
1353 case BSS_CMP_REGULAR:
1354 default:
1355 /* sort by length first, then by contents */
1356 if (ie1[1] != ie2[1])
1357 return ie2[1] - ie1[1];
1358 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
1359 case BSS_CMP_HIDE_NUL:
1360 if (ie1[1] != ie2[1])
1361 return ie2[1] - ie1[1];
1362 /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */
1363 for (i = 0; i < ie2[1]; i++)
1364 if (ie2[i + 2])
1365 return -1;
1366 return 0;
1367 }
1368}
1369
1370static bool cfg80211_bss_type_match(u16 capability,
1371 enum nl80211_band band,
1372 enum ieee80211_bss_type bss_type)
1373{
1374 bool ret = true;
1375 u16 mask, val;
1376
1377 if (bss_type == IEEE80211_BSS_TYPE_ANY)
1378 return ret;
1379
1380 if (band == NL80211_BAND_60GHZ) {
1381 mask = WLAN_CAPABILITY_DMG_TYPE_MASK;
1382 switch (bss_type) {
1383 case IEEE80211_BSS_TYPE_ESS:
1384 val = WLAN_CAPABILITY_DMG_TYPE_AP;
1385 break;
1386 case IEEE80211_BSS_TYPE_PBSS:
1387 val = WLAN_CAPABILITY_DMG_TYPE_PBSS;
1388 break;
1389 case IEEE80211_BSS_TYPE_IBSS:
1390 val = WLAN_CAPABILITY_DMG_TYPE_IBSS;
1391 break;
1392 default:
1393 return false;
1394 }
1395 } else {
1396 mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS;
1397 switch (bss_type) {
1398 case IEEE80211_BSS_TYPE_ESS:
1399 val = WLAN_CAPABILITY_ESS;
1400 break;
1401 case IEEE80211_BSS_TYPE_IBSS:
1402 val = WLAN_CAPABILITY_IBSS;
1403 break;
1404 case IEEE80211_BSS_TYPE_MBSS:
1405 val = 0;
1406 break;
1407 default:
1408 return false;
1409 }
1410 }
1411
1412 ret = ((capability & mask) == val);
1413 return ret;
1414}
1415
1416/* Returned bss is reference counted and must be cleaned up appropriately. */
1417struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
1418 struct ieee80211_channel *channel,
1419 const u8 *bssid,
1420 const u8 *ssid, size_t ssid_len,
1421 enum ieee80211_bss_type bss_type,
1422 enum ieee80211_privacy privacy)
1423{
1424 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1425 struct cfg80211_internal_bss *bss, *res = NULL;
1426 unsigned long now = jiffies;
1427 int bss_privacy;
1428
1429 trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type,
1430 privacy);
1431
1432 spin_lock_bh(&rdev->bss_lock);
1433
1434 list_for_each_entry(bss, &rdev->bss_list, list) {
1435 if (!cfg80211_bss_type_match(bss->pub.capability,
1436 bss->pub.channel->band, bss_type))
1437 continue;
1438
1439 bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY);
1440 if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) ||
1441 (privacy == IEEE80211_PRIVACY_OFF && bss_privacy))
1442 continue;
1443 if (channel && bss->pub.channel != channel)
1444 continue;
1445 if (!is_valid_ether_addr(bss->pub.bssid))
1446 continue;
1447 /* Don't get expired BSS structs */
1448 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
1449 !atomic_read(&bss->hold))
1450 continue;
1451 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
1452 res = bss;
1453 bss_ref_get(rdev, res);
1454 break;
1455 }
1456 }
1457
1458 spin_unlock_bh(&rdev->bss_lock);
1459 if (!res)
1460 return NULL;
1461 trace_cfg80211_return_bss(&res->pub);
1462 return &res->pub;
1463}
1464EXPORT_SYMBOL(cfg80211_get_bss);
1465
1466static void rb_insert_bss(struct cfg80211_registered_device *rdev,
1467 struct cfg80211_internal_bss *bss)
1468{
1469 struct rb_node **p = &rdev->bss_tree.rb_node;
1470 struct rb_node *parent = NULL;
1471 struct cfg80211_internal_bss *tbss;
1472 int cmp;
1473
1474 while (*p) {
1475 parent = *p;
1476 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
1477
1478 cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR);
1479
1480 if (WARN_ON(!cmp)) {
1481 /* will sort of leak this BSS */
1482 return;
1483 }
1484
1485 if (cmp < 0)
1486 p = &(*p)->rb_left;
1487 else
1488 p = &(*p)->rb_right;
1489 }
1490
1491 rb_link_node(&bss->rbn, parent, p);
1492 rb_insert_color(&bss->rbn, &rdev->bss_tree);
1493}
1494
1495static struct cfg80211_internal_bss *
1496rb_find_bss(struct cfg80211_registered_device *rdev,
1497 struct cfg80211_internal_bss *res,
1498 enum bss_compare_mode mode)
1499{
1500 struct rb_node *n = rdev->bss_tree.rb_node;
1501 struct cfg80211_internal_bss *bss;
1502 int r;
1503
1504 while (n) {
1505 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
1506 r = cmp_bss(&res->pub, &bss->pub, mode);
1507
1508 if (r == 0)
1509 return bss;
1510 else if (r < 0)
1511 n = n->rb_left;
1512 else
1513 n = n->rb_right;
1514 }
1515
1516 return NULL;
1517}
1518
1519static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev,
1520 struct cfg80211_internal_bss *new)
1521{
1522 const struct cfg80211_bss_ies *ies;
1523 struct cfg80211_internal_bss *bss;
1524 const u8 *ie;
1525 int i, ssidlen;
1526 u8 fold = 0;
1527 u32 n_entries = 0;
1528
1529 ies = rcu_access_pointer(new->pub.beacon_ies);
1530 if (WARN_ON(!ies))
1531 return false;
1532
1533 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
1534 if (!ie) {
1535 /* nothing to do */
1536 return true;
1537 }
1538
1539 ssidlen = ie[1];
1540 for (i = 0; i < ssidlen; i++)
1541 fold |= ie[2 + i];
1542
1543 if (fold) {
1544 /* not a hidden SSID */
1545 return true;
1546 }
1547
1548 /* This is the bad part ... */
1549
1550 list_for_each_entry(bss, &rdev->bss_list, list) {
1551 /*
1552 * we're iterating all the entries anyway, so take the
1553 * opportunity to validate the list length accounting
1554 */
1555 n_entries++;
1556
1557 if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid))
1558 continue;
1559 if (bss->pub.channel != new->pub.channel)
1560 continue;
1561 if (bss->pub.scan_width != new->pub.scan_width)
1562 continue;
1563 if (rcu_access_pointer(bss->pub.beacon_ies))
1564 continue;
1565 ies = rcu_access_pointer(bss->pub.ies);
1566 if (!ies)
1567 continue;
1568 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
1569 if (!ie)
1570 continue;
1571 if (ssidlen && ie[1] != ssidlen)
1572 continue;
1573 if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss))
1574 continue;
1575 if (WARN_ON_ONCE(!list_empty(&bss->hidden_list)))
1576 list_del(&bss->hidden_list);
1577 /* combine them */
1578 list_add(&bss->hidden_list, &new->hidden_list);
1579 bss->pub.hidden_beacon_bss = &new->pub;
1580 new->refcount += bss->refcount;
1581 rcu_assign_pointer(bss->pub.beacon_ies,
1582 new->pub.beacon_ies);
1583 }
1584
1585 WARN_ONCE(n_entries != rdev->bss_entries,
1586 "rdev bss entries[%d]/list[len:%d] corruption\n",
1587 rdev->bss_entries, n_entries);
1588
1589 return true;
1590}
1591
1592struct cfg80211_non_tx_bss {
1593 struct cfg80211_bss *tx_bss;
1594 u8 max_bssid_indicator;
1595 u8 bssid_index;
1596};
1597
1598static bool
1599cfg80211_update_known_bss(struct cfg80211_registered_device *rdev,
1600 struct cfg80211_internal_bss *known,
1601 struct cfg80211_internal_bss *new,
1602 bool signal_valid)
1603{
1604 lockdep_assert_held(&rdev->bss_lock);
1605
1606 /* Update IEs */
1607 if (rcu_access_pointer(new->pub.proberesp_ies)) {
1608 const struct cfg80211_bss_ies *old;
1609
1610 old = rcu_access_pointer(known->pub.proberesp_ies);
1611
1612 rcu_assign_pointer(known->pub.proberesp_ies,
1613 new->pub.proberesp_ies);
1614 /* Override possible earlier Beacon frame IEs */
1615 rcu_assign_pointer(known->pub.ies,
1616 new->pub.proberesp_ies);
1617 if (old)
1618 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1619 } else if (rcu_access_pointer(new->pub.beacon_ies)) {
1620 const struct cfg80211_bss_ies *old;
1621 struct cfg80211_internal_bss *bss;
1622
1623 if (known->pub.hidden_beacon_bss &&
1624 !list_empty(&known->hidden_list)) {
1625 const struct cfg80211_bss_ies *f;
1626
1627 /* The known BSS struct is one of the probe
1628 * response members of a group, but we're
1629 * receiving a beacon (beacon_ies in the new
1630 * bss is used). This can only mean that the
1631 * AP changed its beacon from not having an
1632 * SSID to showing it, which is confusing so
1633 * drop this information.
1634 */
1635
1636 f = rcu_access_pointer(new->pub.beacon_ies);
1637 kfree_rcu((struct cfg80211_bss_ies *)f, rcu_head);
1638 return false;
1639 }
1640
1641 old = rcu_access_pointer(known->pub.beacon_ies);
1642
1643 rcu_assign_pointer(known->pub.beacon_ies, new->pub.beacon_ies);
1644
1645 /* Override IEs if they were from a beacon before */
1646 if (old == rcu_access_pointer(known->pub.ies))
1647 rcu_assign_pointer(known->pub.ies, new->pub.beacon_ies);
1648
1649 /* Assign beacon IEs to all sub entries */
1650 list_for_each_entry(bss, &known->hidden_list, hidden_list) {
1651 const struct cfg80211_bss_ies *ies;
1652
1653 ies = rcu_access_pointer(bss->pub.beacon_ies);
1654 WARN_ON(ies != old);
1655
1656 rcu_assign_pointer(bss->pub.beacon_ies,
1657 new->pub.beacon_ies);
1658 }
1659
1660 if (old)
1661 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1662 }
1663
1664 known->pub.beacon_interval = new->pub.beacon_interval;
1665
1666 /* don't update the signal if beacon was heard on
1667 * adjacent channel.
1668 */
1669 if (signal_valid)
1670 known->pub.signal = new->pub.signal;
1671 known->pub.capability = new->pub.capability;
1672 known->ts = new->ts;
1673 known->ts_boottime = new->ts_boottime;
1674 known->parent_tsf = new->parent_tsf;
1675 known->pub.chains = new->pub.chains;
1676 memcpy(known->pub.chain_signal, new->pub.chain_signal,
1677 IEEE80211_MAX_CHAINS);
1678 ether_addr_copy(known->parent_bssid, new->parent_bssid);
1679 known->pub.max_bssid_indicator = new->pub.max_bssid_indicator;
1680 known->pub.bssid_index = new->pub.bssid_index;
1681
1682 return true;
1683}
1684
1685/* Returned bss is reference counted and must be cleaned up appropriately. */
1686struct cfg80211_internal_bss *
1687cfg80211_bss_update(struct cfg80211_registered_device *rdev,
1688 struct cfg80211_internal_bss *tmp,
1689 bool signal_valid, unsigned long ts)
1690{
1691 struct cfg80211_internal_bss *found = NULL;
1692
1693 if (WARN_ON(!tmp->pub.channel))
1694 return NULL;
1695
1696 tmp->ts = ts;
1697
1698 spin_lock_bh(&rdev->bss_lock);
1699
1700 if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) {
1701 spin_unlock_bh(&rdev->bss_lock);
1702 return NULL;
1703 }
1704
1705 found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR);
1706
1707 if (found) {
1708 if (!cfg80211_update_known_bss(rdev, found, tmp, signal_valid))
1709 goto drop;
1710 } else {
1711 struct cfg80211_internal_bss *new;
1712 struct cfg80211_internal_bss *hidden;
1713 struct cfg80211_bss_ies *ies;
1714
1715 /*
1716 * create a copy -- the "res" variable that is passed in
1717 * is allocated on the stack since it's not needed in the
1718 * more common case of an update
1719 */
1720 new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size,
1721 GFP_ATOMIC);
1722 if (!new) {
1723 ies = (void *)rcu_dereference(tmp->pub.beacon_ies);
1724 if (ies)
1725 kfree_rcu(ies, rcu_head);
1726 ies = (void *)rcu_dereference(tmp->pub.proberesp_ies);
1727 if (ies)
1728 kfree_rcu(ies, rcu_head);
1729 goto drop;
1730 }
1731 memcpy(new, tmp, sizeof(*new));
1732 new->refcount = 1;
1733 INIT_LIST_HEAD(&new->hidden_list);
1734 INIT_LIST_HEAD(&new->pub.nontrans_list);
1735
1736 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
1737 hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN);
1738 if (!hidden)
1739 hidden = rb_find_bss(rdev, tmp,
1740 BSS_CMP_HIDE_NUL);
1741 if (hidden) {
1742 new->pub.hidden_beacon_bss = &hidden->pub;
1743 list_add(&new->hidden_list,
1744 &hidden->hidden_list);
1745 hidden->refcount++;
1746 rcu_assign_pointer(new->pub.beacon_ies,
1747 hidden->pub.beacon_ies);
1748 }
1749 } else {
1750 /*
1751 * Ok so we found a beacon, and don't have an entry. If
1752 * it's a beacon with hidden SSID, we might be in for an
1753 * expensive search for any probe responses that should
1754 * be grouped with this beacon for updates ...
1755 */
1756 if (!cfg80211_combine_bsses(rdev, new)) {
1757 bss_ref_put(rdev, new);
1758 goto drop;
1759 }
1760 }
1761
1762 if (rdev->bss_entries >= bss_entries_limit &&
1763 !cfg80211_bss_expire_oldest(rdev)) {
1764 bss_ref_put(rdev, new);
1765 goto drop;
1766 }
1767
1768 /* This must be before the call to bss_ref_get */
1769 if (tmp->pub.transmitted_bss) {
1770 struct cfg80211_internal_bss *pbss =
1771 container_of(tmp->pub.transmitted_bss,
1772 struct cfg80211_internal_bss,
1773 pub);
1774
1775 new->pub.transmitted_bss = tmp->pub.transmitted_bss;
1776 bss_ref_get(rdev, pbss);
1777 }
1778
1779 list_add_tail(&new->list, &rdev->bss_list);
1780 rdev->bss_entries++;
1781 rb_insert_bss(rdev, new);
1782 found = new;
1783 }
1784
1785 rdev->bss_generation++;
1786 bss_ref_get(rdev, found);
1787 spin_unlock_bh(&rdev->bss_lock);
1788
1789 return found;
1790 drop:
1791 spin_unlock_bh(&rdev->bss_lock);
1792 return NULL;
1793}
1794
1795/*
1796 * Update RX channel information based on the available frame payload
1797 * information. This is mainly for the 2.4 GHz band where frames can be received
1798 * from neighboring channels and the Beacon frames use the DSSS Parameter Set
1799 * element to indicate the current (transmitting) channel, but this might also
1800 * be needed on other bands if RX frequency does not match with the actual
1801 * operating channel of a BSS.
1802 */
1803static struct ieee80211_channel *
1804cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
1805 struct ieee80211_channel *channel,
1806 enum nl80211_bss_scan_width scan_width)
1807{
1808 const u8 *tmp;
1809 u32 freq;
1810 int channel_number = -1;
1811 struct ieee80211_channel *alt_channel;
1812
1813 if (channel->band == NL80211_BAND_S1GHZ) {
1814 tmp = cfg80211_find_ie(WLAN_EID_S1G_OPERATION, ie, ielen);
1815 if (tmp && tmp[1] >= sizeof(struct ieee80211_s1g_oper_ie)) {
1816 struct ieee80211_s1g_oper_ie *s1gop = (void *)(tmp + 2);
1817
1818 channel_number = s1gop->primary_ch;
1819 }
1820 } else {
1821 tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen);
1822 if (tmp && tmp[1] == 1) {
1823 channel_number = tmp[2];
1824 } else {
1825 tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen);
1826 if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) {
1827 struct ieee80211_ht_operation *htop = (void *)(tmp + 2);
1828
1829 channel_number = htop->primary_chan;
1830 }
1831 }
1832 }
1833
1834 if (channel_number < 0) {
1835 /* No channel information in frame payload */
1836 return channel;
1837 }
1838
1839 freq = ieee80211_channel_to_freq_khz(channel_number, channel->band);
1840 alt_channel = ieee80211_get_channel_khz(wiphy, freq);
1841 if (!alt_channel) {
1842 if (channel->band == NL80211_BAND_2GHZ) {
1843 /*
1844 * Better not allow unexpected channels when that could
1845 * be going beyond the 1-11 range (e.g., discovering
1846 * BSS on channel 12 when radio is configured for
1847 * channel 11.
1848 */
1849 return NULL;
1850 }
1851
1852 /* No match for the payload channel number - ignore it */
1853 return channel;
1854 }
1855
1856 if (scan_width == NL80211_BSS_CHAN_WIDTH_10 ||
1857 scan_width == NL80211_BSS_CHAN_WIDTH_5) {
1858 /*
1859 * Ignore channel number in 5 and 10 MHz channels where there
1860 * may not be an n:1 or 1:n mapping between frequencies and
1861 * channel numbers.
1862 */
1863 return channel;
1864 }
1865
1866 /*
1867 * Use the channel determined through the payload channel number
1868 * instead of the RX channel reported by the driver.
1869 */
1870 if (alt_channel->flags & IEEE80211_CHAN_DISABLED)
1871 return NULL;
1872 return alt_channel;
1873}
1874
1875/* Returned bss is reference counted and must be cleaned up appropriately. */
1876static struct cfg80211_bss *
1877cfg80211_inform_single_bss_data(struct wiphy *wiphy,
1878 struct cfg80211_inform_bss *data,
1879 enum cfg80211_bss_frame_type ftype,
1880 const u8 *bssid, u64 tsf, u16 capability,
1881 u16 beacon_interval, const u8 *ie, size_t ielen,
1882 struct cfg80211_non_tx_bss *non_tx_data,
1883 gfp_t gfp)
1884{
1885 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1886 struct cfg80211_bss_ies *ies;
1887 struct ieee80211_channel *channel;
1888 struct cfg80211_internal_bss tmp = {}, *res;
1889 int bss_type;
1890 bool signal_valid;
1891 unsigned long ts;
1892
1893 if (WARN_ON(!wiphy))
1894 return NULL;
1895
1896 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
1897 (data->signal < 0 || data->signal > 100)))
1898 return NULL;
1899
1900 channel = cfg80211_get_bss_channel(wiphy, ie, ielen, data->chan,
1901 data->scan_width);
1902 if (!channel)
1903 return NULL;
1904
1905 memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
1906 tmp.pub.channel = channel;
1907 tmp.pub.scan_width = data->scan_width;
1908 tmp.pub.signal = data->signal;
1909 tmp.pub.beacon_interval = beacon_interval;
1910 tmp.pub.capability = capability;
1911 tmp.ts_boottime = data->boottime_ns;
1912 tmp.parent_tsf = data->parent_tsf;
1913 ether_addr_copy(tmp.parent_bssid, data->parent_bssid);
1914
1915 if (non_tx_data) {
1916 tmp.pub.transmitted_bss = non_tx_data->tx_bss;
1917 ts = bss_from_pub(non_tx_data->tx_bss)->ts;
1918 tmp.pub.bssid_index = non_tx_data->bssid_index;
1919 tmp.pub.max_bssid_indicator = non_tx_data->max_bssid_indicator;
1920 } else {
1921 ts = jiffies;
1922 }
1923
1924 /*
1925 * If we do not know here whether the IEs are from a Beacon or Probe
1926 * Response frame, we need to pick one of the options and only use it
1927 * with the driver that does not provide the full Beacon/Probe Response
1928 * frame. Use Beacon frame pointer to avoid indicating that this should
1929 * override the IEs pointer should we have received an earlier
1930 * indication of Probe Response data.
1931 */
1932 ies = kzalloc(sizeof(*ies) + ielen, gfp);
1933 if (!ies)
1934 return NULL;
1935 ies->len = ielen;
1936 ies->tsf = tsf;
1937 ies->from_beacon = false;
1938 memcpy(ies->data, ie, ielen);
1939
1940 switch (ftype) {
1941 case CFG80211_BSS_FTYPE_BEACON:
1942 ies->from_beacon = true;
1943 fallthrough;
1944 case CFG80211_BSS_FTYPE_UNKNOWN:
1945 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
1946 break;
1947 case CFG80211_BSS_FTYPE_PRESP:
1948 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
1949 break;
1950 }
1951 rcu_assign_pointer(tmp.pub.ies, ies);
1952
1953 signal_valid = data->chan == channel;
1954 res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid, ts);
1955 if (!res)
1956 return NULL;
1957
1958 if (channel->band == NL80211_BAND_60GHZ) {
1959 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
1960 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
1961 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
1962 regulatory_hint_found_beacon(wiphy, channel, gfp);
1963 } else {
1964 if (res->pub.capability & WLAN_CAPABILITY_ESS)
1965 regulatory_hint_found_beacon(wiphy, channel, gfp);
1966 }
1967
1968 if (non_tx_data) {
1969 /* this is a nontransmitting bss, we need to add it to
1970 * transmitting bss' list if it is not there
1971 */
1972 if (cfg80211_add_nontrans_list(non_tx_data->tx_bss,
1973 &res->pub)) {
1974 if (__cfg80211_unlink_bss(rdev, res))
1975 rdev->bss_generation++;
1976 }
1977 }
1978
1979 trace_cfg80211_return_bss(&res->pub);
1980 /* cfg80211_bss_update gives us a referenced result */
1981 return &res->pub;
1982}
1983
1984static const struct element
1985*cfg80211_get_profile_continuation(const u8 *ie, size_t ielen,
1986 const struct element *mbssid_elem,
1987 const struct element *sub_elem)
1988{
1989 const u8 *mbssid_end = mbssid_elem->data + mbssid_elem->datalen;
1990 const struct element *next_mbssid;
1991 const struct element *next_sub;
1992
1993 next_mbssid = cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID,
1994 mbssid_end,
1995 ielen - (mbssid_end - ie));
1996
1997 /*
1998 * If it is not the last subelement in current MBSSID IE or there isn't
1999 * a next MBSSID IE - profile is complete.
2000 */
2001 if ((sub_elem->data + sub_elem->datalen < mbssid_end - 1) ||
2002 !next_mbssid)
2003 return NULL;
2004
2005 /* For any length error, just return NULL */
2006
2007 if (next_mbssid->datalen < 4)
2008 return NULL;
2009
2010 next_sub = (void *)&next_mbssid->data[1];
2011
2012 if (next_mbssid->data + next_mbssid->datalen <
2013 next_sub->data + next_sub->datalen)
2014 return NULL;
2015
2016 if (next_sub->id != 0 || next_sub->datalen < 2)
2017 return NULL;
2018
2019 /*
2020 * Check if the first element in the next sub element is a start
2021 * of a new profile
2022 */
2023 return next_sub->data[0] == WLAN_EID_NON_TX_BSSID_CAP ?
2024 NULL : next_mbssid;
2025}
2026
2027size_t cfg80211_merge_profile(const u8 *ie, size_t ielen,
2028 const struct element *mbssid_elem,
2029 const struct element *sub_elem,
2030 u8 *merged_ie, size_t max_copy_len)
2031{
2032 size_t copied_len = sub_elem->datalen;
2033 const struct element *next_mbssid;
2034
2035 if (sub_elem->datalen > max_copy_len)
2036 return 0;
2037
2038 memcpy(merged_ie, sub_elem->data, sub_elem->datalen);
2039
2040 while ((next_mbssid = cfg80211_get_profile_continuation(ie, ielen,
2041 mbssid_elem,
2042 sub_elem))) {
2043 const struct element *next_sub = (void *)&next_mbssid->data[1];
2044
2045 if (copied_len + next_sub->datalen > max_copy_len)
2046 break;
2047 memcpy(merged_ie + copied_len, next_sub->data,
2048 next_sub->datalen);
2049 copied_len += next_sub->datalen;
2050 }
2051
2052 return copied_len;
2053}
2054EXPORT_SYMBOL(cfg80211_merge_profile);
2055
2056static void cfg80211_parse_mbssid_data(struct wiphy *wiphy,
2057 struct cfg80211_inform_bss *data,
2058 enum cfg80211_bss_frame_type ftype,
2059 const u8 *bssid, u64 tsf,
2060 u16 beacon_interval, const u8 *ie,
2061 size_t ielen,
2062 struct cfg80211_non_tx_bss *non_tx_data,
2063 gfp_t gfp)
2064{
2065 const u8 *mbssid_index_ie;
2066 const struct element *elem, *sub;
2067 size_t new_ie_len;
2068 u8 new_bssid[ETH_ALEN];
2069 u8 *new_ie, *profile;
2070 u64 seen_indices = 0;
2071 u16 capability;
2072 struct cfg80211_bss *bss;
2073
2074 if (!non_tx_data)
2075 return;
2076 if (!cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
2077 return;
2078 if (!wiphy->support_mbssid)
2079 return;
2080 if (wiphy->support_only_he_mbssid &&
2081 !cfg80211_find_ext_ie(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen))
2082 return;
2083
2084 new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp);
2085 if (!new_ie)
2086 return;
2087
2088 profile = kmalloc(ielen, gfp);
2089 if (!profile)
2090 goto out;
2091
2092 for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, ie, ielen) {
2093 if (elem->datalen < 4)
2094 continue;
2095 for_each_element(sub, elem->data + 1, elem->datalen - 1) {
2096 u8 profile_len;
2097
2098 if (sub->id != 0 || sub->datalen < 4) {
2099 /* not a valid BSS profile */
2100 continue;
2101 }
2102
2103 if (sub->data[0] != WLAN_EID_NON_TX_BSSID_CAP ||
2104 sub->data[1] != 2) {
2105 /* The first element within the Nontransmitted
2106 * BSSID Profile is not the Nontransmitted
2107 * BSSID Capability element.
2108 */
2109 continue;
2110 }
2111
2112 memset(profile, 0, ielen);
2113 profile_len = cfg80211_merge_profile(ie, ielen,
2114 elem,
2115 sub,
2116 profile,
2117 ielen);
2118
2119 /* found a Nontransmitted BSSID Profile */
2120 mbssid_index_ie = cfg80211_find_ie
2121 (WLAN_EID_MULTI_BSSID_IDX,
2122 profile, profile_len);
2123 if (!mbssid_index_ie || mbssid_index_ie[1] < 1 ||
2124 mbssid_index_ie[2] == 0 ||
2125 mbssid_index_ie[2] > 46) {
2126 /* No valid Multiple BSSID-Index element */
2127 continue;
2128 }
2129
2130 if (seen_indices & BIT_ULL(mbssid_index_ie[2]))
2131 /* We don't support legacy split of a profile */
2132 net_dbg_ratelimited("Partial info for BSSID index %d\n",
2133 mbssid_index_ie[2]);
2134
2135 seen_indices |= BIT_ULL(mbssid_index_ie[2]);
2136
2137 non_tx_data->bssid_index = mbssid_index_ie[2];
2138 non_tx_data->max_bssid_indicator = elem->data[0];
2139
2140 cfg80211_gen_new_bssid(bssid,
2141 non_tx_data->max_bssid_indicator,
2142 non_tx_data->bssid_index,
2143 new_bssid);
2144 memset(new_ie, 0, IEEE80211_MAX_DATA_LEN);
2145 new_ie_len = cfg80211_gen_new_ie(ie, ielen,
2146 profile,
2147 profile_len, new_ie,
2148 gfp);
2149 if (!new_ie_len)
2150 continue;
2151
2152 capability = get_unaligned_le16(profile + 2);
2153 bss = cfg80211_inform_single_bss_data(wiphy, data,
2154 ftype,
2155 new_bssid, tsf,
2156 capability,
2157 beacon_interval,
2158 new_ie,
2159 new_ie_len,
2160 non_tx_data,
2161 gfp);
2162 if (!bss)
2163 break;
2164 cfg80211_put_bss(wiphy, bss);
2165 }
2166 }
2167
2168out:
2169 kfree(new_ie);
2170 kfree(profile);
2171}
2172
2173struct cfg80211_bss *
2174cfg80211_inform_bss_data(struct wiphy *wiphy,
2175 struct cfg80211_inform_bss *data,
2176 enum cfg80211_bss_frame_type ftype,
2177 const u8 *bssid, u64 tsf, u16 capability,
2178 u16 beacon_interval, const u8 *ie, size_t ielen,
2179 gfp_t gfp)
2180{
2181 struct cfg80211_bss *res;
2182 struct cfg80211_non_tx_bss non_tx_data;
2183
2184 res = cfg80211_inform_single_bss_data(wiphy, data, ftype, bssid, tsf,
2185 capability, beacon_interval, ie,
2186 ielen, NULL, gfp);
2187 if (!res)
2188 return NULL;
2189 non_tx_data.tx_bss = res;
2190 cfg80211_parse_mbssid_data(wiphy, data, ftype, bssid, tsf,
2191 beacon_interval, ie, ielen, &non_tx_data,
2192 gfp);
2193 return res;
2194}
2195EXPORT_SYMBOL(cfg80211_inform_bss_data);
2196
2197static void
2198cfg80211_parse_mbssid_frame_data(struct wiphy *wiphy,
2199 struct cfg80211_inform_bss *data,
2200 struct ieee80211_mgmt *mgmt, size_t len,
2201 struct cfg80211_non_tx_bss *non_tx_data,
2202 gfp_t gfp)
2203{
2204 enum cfg80211_bss_frame_type ftype;
2205 const u8 *ie = mgmt->u.probe_resp.variable;
2206 size_t ielen = len - offsetof(struct ieee80211_mgmt,
2207 u.probe_resp.variable);
2208
2209 ftype = ieee80211_is_beacon(mgmt->frame_control) ?
2210 CFG80211_BSS_FTYPE_BEACON : CFG80211_BSS_FTYPE_PRESP;
2211
2212 cfg80211_parse_mbssid_data(wiphy, data, ftype, mgmt->bssid,
2213 le64_to_cpu(mgmt->u.probe_resp.timestamp),
2214 le16_to_cpu(mgmt->u.probe_resp.beacon_int),
2215 ie, ielen, non_tx_data, gfp);
2216}
2217
2218static void
2219cfg80211_update_notlisted_nontrans(struct wiphy *wiphy,
2220 struct cfg80211_bss *nontrans_bss,
2221 struct ieee80211_mgmt *mgmt, size_t len)
2222{
2223 u8 *ie, *new_ie, *pos;
2224 const u8 *nontrans_ssid, *trans_ssid, *mbssid;
2225 size_t ielen = len - offsetof(struct ieee80211_mgmt,
2226 u.probe_resp.variable);
2227 size_t new_ie_len;
2228 struct cfg80211_bss_ies *new_ies;
2229 const struct cfg80211_bss_ies *old;
2230 u8 cpy_len;
2231
2232 lockdep_assert_held(&wiphy_to_rdev(wiphy)->bss_lock);
2233
2234 ie = mgmt->u.probe_resp.variable;
2235
2236 new_ie_len = ielen;
2237 trans_ssid = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen);
2238 if (!trans_ssid)
2239 return;
2240 new_ie_len -= trans_ssid[1];
2241 mbssid = cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen);
2242 /*
2243 * It's not valid to have the MBSSID element before SSID
2244 * ignore if that happens - the code below assumes it is
2245 * after (while copying things inbetween).
2246 */
2247 if (!mbssid || mbssid < trans_ssid)
2248 return;
2249 new_ie_len -= mbssid[1];
2250
2251 nontrans_ssid = ieee80211_bss_get_ie(nontrans_bss, WLAN_EID_SSID);
2252 if (!nontrans_ssid)
2253 return;
2254
2255 new_ie_len += nontrans_ssid[1];
2256
2257 /* generate new ie for nontrans BSS
2258 * 1. replace SSID with nontrans BSS' SSID
2259 * 2. skip MBSSID IE
2260 */
2261 new_ie = kzalloc(new_ie_len, GFP_ATOMIC);
2262 if (!new_ie)
2263 return;
2264
2265 new_ies = kzalloc(sizeof(*new_ies) + new_ie_len, GFP_ATOMIC);
2266 if (!new_ies)
2267 goto out_free;
2268
2269 pos = new_ie;
2270
2271 /* copy the nontransmitted SSID */
2272 cpy_len = nontrans_ssid[1] + 2;
2273 memcpy(pos, nontrans_ssid, cpy_len);
2274 pos += cpy_len;
2275 /* copy the IEs between SSID and MBSSID */
2276 cpy_len = trans_ssid[1] + 2;
2277 memcpy(pos, (trans_ssid + cpy_len), (mbssid - (trans_ssid + cpy_len)));
2278 pos += (mbssid - (trans_ssid + cpy_len));
2279 /* copy the IEs after MBSSID */
2280 cpy_len = mbssid[1] + 2;
2281 memcpy(pos, mbssid + cpy_len, ((ie + ielen) - (mbssid + cpy_len)));
2282
2283 /* update ie */
2284 new_ies->len = new_ie_len;
2285 new_ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
2286 new_ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control);
2287 memcpy(new_ies->data, new_ie, new_ie_len);
2288 if (ieee80211_is_probe_resp(mgmt->frame_control)) {
2289 old = rcu_access_pointer(nontrans_bss->proberesp_ies);
2290 rcu_assign_pointer(nontrans_bss->proberesp_ies, new_ies);
2291 rcu_assign_pointer(nontrans_bss->ies, new_ies);
2292 if (old)
2293 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
2294 } else {
2295 old = rcu_access_pointer(nontrans_bss->beacon_ies);
2296 rcu_assign_pointer(nontrans_bss->beacon_ies, new_ies);
2297 rcu_assign_pointer(nontrans_bss->ies, new_ies);
2298 if (old)
2299 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
2300 }
2301
2302out_free:
2303 kfree(new_ie);
2304}
2305
2306/* cfg80211_inform_bss_width_frame helper */
2307static struct cfg80211_bss *
2308cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy,
2309 struct cfg80211_inform_bss *data,
2310 struct ieee80211_mgmt *mgmt, size_t len,
2311 gfp_t gfp)
2312{
2313 struct cfg80211_internal_bss tmp = {}, *res;
2314 struct cfg80211_bss_ies *ies;
2315 struct ieee80211_channel *channel;
2316 bool signal_valid;
2317 struct ieee80211_ext *ext = NULL;
2318 u8 *bssid, *variable;
2319 u16 capability, beacon_int;
2320 size_t ielen, min_hdr_len = offsetof(struct ieee80211_mgmt,
2321 u.probe_resp.variable);
2322 int bss_type;
2323
2324 BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
2325 offsetof(struct ieee80211_mgmt, u.beacon.variable));
2326
2327 trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len);
2328
2329 if (WARN_ON(!mgmt))
2330 return NULL;
2331
2332 if (WARN_ON(!wiphy))
2333 return NULL;
2334
2335 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
2336 (data->signal < 0 || data->signal > 100)))
2337 return NULL;
2338
2339 if (ieee80211_is_s1g_beacon(mgmt->frame_control)) {
2340 ext = (void *) mgmt;
2341 min_hdr_len = offsetof(struct ieee80211_ext, u.s1g_beacon);
2342 if (ieee80211_is_s1g_short_beacon(mgmt->frame_control))
2343 min_hdr_len = offsetof(struct ieee80211_ext,
2344 u.s1g_short_beacon.variable);
2345 }
2346
2347 if (WARN_ON(len < min_hdr_len))
2348 return NULL;
2349
2350 ielen = len - min_hdr_len;
2351 variable = mgmt->u.probe_resp.variable;
2352 if (ext) {
2353 if (ieee80211_is_s1g_short_beacon(mgmt->frame_control))
2354 variable = ext->u.s1g_short_beacon.variable;
2355 else
2356 variable = ext->u.s1g_beacon.variable;
2357 }
2358
2359 channel = cfg80211_get_bss_channel(wiphy, variable,
2360 ielen, data->chan, data->scan_width);
2361 if (!channel)
2362 return NULL;
2363
2364 if (ext) {
2365 const struct ieee80211_s1g_bcn_compat_ie *compat;
2366 const struct element *elem;
2367
2368 elem = cfg80211_find_elem(WLAN_EID_S1G_BCN_COMPAT,
2369 variable, ielen);
2370 if (!elem)
2371 return NULL;
2372 if (elem->datalen < sizeof(*compat))
2373 return NULL;
2374 compat = (void *)elem->data;
2375 bssid = ext->u.s1g_beacon.sa;
2376 capability = le16_to_cpu(compat->compat_info);
2377 beacon_int = le16_to_cpu(compat->beacon_int);
2378 } else {
2379 bssid = mgmt->bssid;
2380 beacon_int = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
2381 capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
2382 }
2383
2384 ies = kzalloc(sizeof(*ies) + ielen, gfp);
2385 if (!ies)
2386 return NULL;
2387 ies->len = ielen;
2388 ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
2389 ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control) ||
2390 ieee80211_is_s1g_beacon(mgmt->frame_control);
2391 memcpy(ies->data, variable, ielen);
2392
2393 if (ieee80211_is_probe_resp(mgmt->frame_control))
2394 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
2395 else
2396 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
2397 rcu_assign_pointer(tmp.pub.ies, ies);
2398
2399 memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
2400 tmp.pub.beacon_interval = beacon_int;
2401 tmp.pub.capability = capability;
2402 tmp.pub.channel = channel;
2403 tmp.pub.scan_width = data->scan_width;
2404 tmp.pub.signal = data->signal;
2405 tmp.ts_boottime = data->boottime_ns;
2406 tmp.parent_tsf = data->parent_tsf;
2407 tmp.pub.chains = data->chains;
2408 memcpy(tmp.pub.chain_signal, data->chain_signal, IEEE80211_MAX_CHAINS);
2409 ether_addr_copy(tmp.parent_bssid, data->parent_bssid);
2410
2411 signal_valid = data->chan == channel;
2412 res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid,
2413 jiffies);
2414 if (!res)
2415 return NULL;
2416
2417 if (channel->band == NL80211_BAND_60GHZ) {
2418 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
2419 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
2420 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
2421 regulatory_hint_found_beacon(wiphy, channel, gfp);
2422 } else {
2423 if (res->pub.capability & WLAN_CAPABILITY_ESS)
2424 regulatory_hint_found_beacon(wiphy, channel, gfp);
2425 }
2426
2427 trace_cfg80211_return_bss(&res->pub);
2428 /* cfg80211_bss_update gives us a referenced result */
2429 return &res->pub;
2430}
2431
2432struct cfg80211_bss *
2433cfg80211_inform_bss_frame_data(struct wiphy *wiphy,
2434 struct cfg80211_inform_bss *data,
2435 struct ieee80211_mgmt *mgmt, size_t len,
2436 gfp_t gfp)
2437{
2438 struct cfg80211_bss *res, *tmp_bss;
2439 const u8 *ie = mgmt->u.probe_resp.variable;
2440 const struct cfg80211_bss_ies *ies1, *ies2;
2441 size_t ielen = len - offsetof(struct ieee80211_mgmt,
2442 u.probe_resp.variable);
2443 struct cfg80211_non_tx_bss non_tx_data;
2444
2445 res = cfg80211_inform_single_bss_frame_data(wiphy, data, mgmt,
2446 len, gfp);
2447 if (!res || !wiphy->support_mbssid ||
2448 !cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
2449 return res;
2450 if (wiphy->support_only_he_mbssid &&
2451 !cfg80211_find_ext_ie(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen))
2452 return res;
2453
2454 non_tx_data.tx_bss = res;
2455 /* process each non-transmitting bss */
2456 cfg80211_parse_mbssid_frame_data(wiphy, data, mgmt, len,
2457 &non_tx_data, gfp);
2458
2459 spin_lock_bh(&wiphy_to_rdev(wiphy)->bss_lock);
2460
2461 /* check if the res has other nontransmitting bss which is not
2462 * in MBSSID IE
2463 */
2464 ies1 = rcu_access_pointer(res->ies);
2465
2466 /* go through nontrans_list, if the timestamp of the BSS is
2467 * earlier than the timestamp of the transmitting BSS then
2468 * update it
2469 */
2470 list_for_each_entry(tmp_bss, &res->nontrans_list,
2471 nontrans_list) {
2472 ies2 = rcu_access_pointer(tmp_bss->ies);
2473 if (ies2->tsf < ies1->tsf)
2474 cfg80211_update_notlisted_nontrans(wiphy, tmp_bss,
2475 mgmt, len);
2476 }
2477 spin_unlock_bh(&wiphy_to_rdev(wiphy)->bss_lock);
2478
2479 return res;
2480}
2481EXPORT_SYMBOL(cfg80211_inform_bss_frame_data);
2482
2483void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
2484{
2485 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2486 struct cfg80211_internal_bss *bss;
2487
2488 if (!pub)
2489 return;
2490
2491 bss = container_of(pub, struct cfg80211_internal_bss, pub);
2492
2493 spin_lock_bh(&rdev->bss_lock);
2494 bss_ref_get(rdev, bss);
2495 spin_unlock_bh(&rdev->bss_lock);
2496}
2497EXPORT_SYMBOL(cfg80211_ref_bss);
2498
2499void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
2500{
2501 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2502 struct cfg80211_internal_bss *bss;
2503
2504 if (!pub)
2505 return;
2506
2507 bss = container_of(pub, struct cfg80211_internal_bss, pub);
2508
2509 spin_lock_bh(&rdev->bss_lock);
2510 bss_ref_put(rdev, bss);
2511 spin_unlock_bh(&rdev->bss_lock);
2512}
2513EXPORT_SYMBOL(cfg80211_put_bss);
2514
2515void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
2516{
2517 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2518 struct cfg80211_internal_bss *bss, *tmp1;
2519 struct cfg80211_bss *nontrans_bss, *tmp;
2520
2521 if (WARN_ON(!pub))
2522 return;
2523
2524 bss = container_of(pub, struct cfg80211_internal_bss, pub);
2525
2526 spin_lock_bh(&rdev->bss_lock);
2527 if (list_empty(&bss->list))
2528 goto out;
2529
2530 list_for_each_entry_safe(nontrans_bss, tmp,
2531 &pub->nontrans_list,
2532 nontrans_list) {
2533 tmp1 = container_of(nontrans_bss,
2534 struct cfg80211_internal_bss, pub);
2535 if (__cfg80211_unlink_bss(rdev, tmp1))
2536 rdev->bss_generation++;
2537 }
2538
2539 if (__cfg80211_unlink_bss(rdev, bss))
2540 rdev->bss_generation++;
2541out:
2542 spin_unlock_bh(&rdev->bss_lock);
2543}
2544EXPORT_SYMBOL(cfg80211_unlink_bss);
2545
2546void cfg80211_bss_iter(struct wiphy *wiphy,
2547 struct cfg80211_chan_def *chandef,
2548 void (*iter)(struct wiphy *wiphy,
2549 struct cfg80211_bss *bss,
2550 void *data),
2551 void *iter_data)
2552{
2553 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2554 struct cfg80211_internal_bss *bss;
2555
2556 spin_lock_bh(&rdev->bss_lock);
2557
2558 list_for_each_entry(bss, &rdev->bss_list, list) {
2559 if (!chandef || cfg80211_is_sub_chan(chandef, bss->pub.channel))
2560 iter(wiphy, &bss->pub, iter_data);
2561 }
2562
2563 spin_unlock_bh(&rdev->bss_lock);
2564}
2565EXPORT_SYMBOL(cfg80211_bss_iter);
2566
2567void cfg80211_update_assoc_bss_entry(struct wireless_dev *wdev,
2568 struct ieee80211_channel *chan)
2569{
2570 struct wiphy *wiphy = wdev->wiphy;
2571 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2572 struct cfg80211_internal_bss *cbss = wdev->current_bss;
2573 struct cfg80211_internal_bss *new = NULL;
2574 struct cfg80211_internal_bss *bss;
2575 struct cfg80211_bss *nontrans_bss;
2576 struct cfg80211_bss *tmp;
2577
2578 spin_lock_bh(&rdev->bss_lock);
2579
2580 /*
2581 * Some APs use CSA also for bandwidth changes, i.e., without actually
2582 * changing the control channel, so no need to update in such a case.
2583 */
2584 if (cbss->pub.channel == chan)
2585 goto done;
2586
2587 /* use transmitting bss */
2588 if (cbss->pub.transmitted_bss)
2589 cbss = container_of(cbss->pub.transmitted_bss,
2590 struct cfg80211_internal_bss,
2591 pub);
2592
2593 cbss->pub.channel = chan;
2594
2595 list_for_each_entry(bss, &rdev->bss_list, list) {
2596 if (!cfg80211_bss_type_match(bss->pub.capability,
2597 bss->pub.channel->band,
2598 wdev->conn_bss_type))
2599 continue;
2600
2601 if (bss == cbss)
2602 continue;
2603
2604 if (!cmp_bss(&bss->pub, &cbss->pub, BSS_CMP_REGULAR)) {
2605 new = bss;
2606 break;
2607 }
2608 }
2609
2610 if (new) {
2611 /* to save time, update IEs for transmitting bss only */
2612 if (cfg80211_update_known_bss(rdev, cbss, new, false)) {
2613 new->pub.proberesp_ies = NULL;
2614 new->pub.beacon_ies = NULL;
2615 }
2616
2617 list_for_each_entry_safe(nontrans_bss, tmp,
2618 &new->pub.nontrans_list,
2619 nontrans_list) {
2620 bss = container_of(nontrans_bss,
2621 struct cfg80211_internal_bss, pub);
2622 if (__cfg80211_unlink_bss(rdev, bss))
2623 rdev->bss_generation++;
2624 }
2625
2626 WARN_ON(atomic_read(&new->hold));
2627 if (!WARN_ON(!__cfg80211_unlink_bss(rdev, new)))
2628 rdev->bss_generation++;
2629 }
2630
2631 rb_erase(&cbss->rbn, &rdev->bss_tree);
2632 rb_insert_bss(rdev, cbss);
2633 rdev->bss_generation++;
2634
2635 list_for_each_entry_safe(nontrans_bss, tmp,
2636 &cbss->pub.nontrans_list,
2637 nontrans_list) {
2638 bss = container_of(nontrans_bss,
2639 struct cfg80211_internal_bss, pub);
2640 bss->pub.channel = chan;
2641 rb_erase(&bss->rbn, &rdev->bss_tree);
2642 rb_insert_bss(rdev, bss);
2643 rdev->bss_generation++;
2644 }
2645
2646done:
2647 spin_unlock_bh(&rdev->bss_lock);
2648}
2649
2650#ifdef CONFIG_CFG80211_WEXT
2651static struct cfg80211_registered_device *
2652cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
2653{
2654 struct cfg80211_registered_device *rdev;
2655 struct net_device *dev;
2656
2657 ASSERT_RTNL();
2658
2659 dev = dev_get_by_index(net, ifindex);
2660 if (!dev)
2661 return ERR_PTR(-ENODEV);
2662 if (dev->ieee80211_ptr)
2663 rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy);
2664 else
2665 rdev = ERR_PTR(-ENODEV);
2666 dev_put(dev);
2667 return rdev;
2668}
2669
2670int cfg80211_wext_siwscan(struct net_device *dev,
2671 struct iw_request_info *info,
2672 union iwreq_data *wrqu, char *extra)
2673{
2674 struct cfg80211_registered_device *rdev;
2675 struct wiphy *wiphy;
2676 struct iw_scan_req *wreq = NULL;
2677 struct cfg80211_scan_request *creq = NULL;
2678 int i, err, n_channels = 0;
2679 enum nl80211_band band;
2680
2681 if (!netif_running(dev))
2682 return -ENETDOWN;
2683
2684 if (wrqu->data.length == sizeof(struct iw_scan_req))
2685 wreq = (struct iw_scan_req *)extra;
2686
2687 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
2688
2689 if (IS_ERR(rdev))
2690 return PTR_ERR(rdev);
2691
2692 if (rdev->scan_req || rdev->scan_msg) {
2693 err = -EBUSY;
2694 goto out;
2695 }
2696
2697 wiphy = &rdev->wiphy;
2698
2699 /* Determine number of channels, needed to allocate creq */
2700 if (wreq && wreq->num_channels)
2701 n_channels = wreq->num_channels;
2702 else
2703 n_channels = ieee80211_get_num_supported_channels(wiphy);
2704
2705 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
2706 n_channels * sizeof(void *),
2707 GFP_ATOMIC);
2708 if (!creq) {
2709 err = -ENOMEM;
2710 goto out;
2711 }
2712
2713 creq->wiphy = wiphy;
2714 creq->wdev = dev->ieee80211_ptr;
2715 /* SSIDs come after channels */
2716 creq->ssids = (void *)&creq->channels[n_channels];
2717 creq->n_channels = n_channels;
2718 creq->n_ssids = 1;
2719 creq->scan_start = jiffies;
2720
2721 /* translate "Scan on frequencies" request */
2722 i = 0;
2723 for (band = 0; band < NUM_NL80211_BANDS; band++) {
2724 int j;
2725
2726 if (!wiphy->bands[band])
2727 continue;
2728
2729 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
2730 /* ignore disabled channels */
2731 if (wiphy->bands[band]->channels[j].flags &
2732 IEEE80211_CHAN_DISABLED)
2733 continue;
2734
2735 /* If we have a wireless request structure and the
2736 * wireless request specifies frequencies, then search
2737 * for the matching hardware channel.
2738 */
2739 if (wreq && wreq->num_channels) {
2740 int k;
2741 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
2742 for (k = 0; k < wreq->num_channels; k++) {
2743 struct iw_freq *freq =
2744 &wreq->channel_list[k];
2745 int wext_freq =
2746 cfg80211_wext_freq(freq);
2747
2748 if (wext_freq == wiphy_freq)
2749 goto wext_freq_found;
2750 }
2751 goto wext_freq_not_found;
2752 }
2753
2754 wext_freq_found:
2755 creq->channels[i] = &wiphy->bands[band]->channels[j];
2756 i++;
2757 wext_freq_not_found: ;
2758 }
2759 }
2760 /* No channels found? */
2761 if (!i) {
2762 err = -EINVAL;
2763 goto out;
2764 }
2765
2766 /* Set real number of channels specified in creq->channels[] */
2767 creq->n_channels = i;
2768
2769 /* translate "Scan for SSID" request */
2770 if (wreq) {
2771 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
2772 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
2773 err = -EINVAL;
2774 goto out;
2775 }
2776 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
2777 creq->ssids[0].ssid_len = wreq->essid_len;
2778 }
2779 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
2780 creq->n_ssids = 0;
2781 }
2782
2783 for (i = 0; i < NUM_NL80211_BANDS; i++)
2784 if (wiphy->bands[i])
2785 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
2786
2787 eth_broadcast_addr(creq->bssid);
2788
2789 wiphy_lock(&rdev->wiphy);
2790
2791 rdev->scan_req = creq;
2792 err = rdev_scan(rdev, creq);
2793 if (err) {
2794 rdev->scan_req = NULL;
2795 /* creq will be freed below */
2796 } else {
2797 nl80211_send_scan_start(rdev, dev->ieee80211_ptr);
2798 /* creq now owned by driver */
2799 creq = NULL;
2800 dev_hold(dev);
2801 }
2802 wiphy_unlock(&rdev->wiphy);
2803 out:
2804 kfree(creq);
2805 return err;
2806}
2807EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan);
2808
2809static char *ieee80211_scan_add_ies(struct iw_request_info *info,
2810 const struct cfg80211_bss_ies *ies,
2811 char *current_ev, char *end_buf)
2812{
2813 const u8 *pos, *end, *next;
2814 struct iw_event iwe;
2815
2816 if (!ies)
2817 return current_ev;
2818
2819 /*
2820 * If needed, fragment the IEs buffer (at IE boundaries) into short
2821 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
2822 */
2823 pos = ies->data;
2824 end = pos + ies->len;
2825
2826 while (end - pos > IW_GENERIC_IE_MAX) {
2827 next = pos + 2 + pos[1];
2828 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
2829 next = next + 2 + next[1];
2830
2831 memset(&iwe, 0, sizeof(iwe));
2832 iwe.cmd = IWEVGENIE;
2833 iwe.u.data.length = next - pos;
2834 current_ev = iwe_stream_add_point_check(info, current_ev,
2835 end_buf, &iwe,
2836 (void *)pos);
2837 if (IS_ERR(current_ev))
2838 return current_ev;
2839 pos = next;
2840 }
2841
2842 if (end > pos) {
2843 memset(&iwe, 0, sizeof(iwe));
2844 iwe.cmd = IWEVGENIE;
2845 iwe.u.data.length = end - pos;
2846 current_ev = iwe_stream_add_point_check(info, current_ev,
2847 end_buf, &iwe,
2848 (void *)pos);
2849 if (IS_ERR(current_ev))
2850 return current_ev;
2851 }
2852
2853 return current_ev;
2854}
2855
2856static char *
2857ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
2858 struct cfg80211_internal_bss *bss, char *current_ev,
2859 char *end_buf)
2860{
2861 const struct cfg80211_bss_ies *ies;
2862 struct iw_event iwe;
2863 const u8 *ie;
2864 u8 buf[50];
2865 u8 *cfg, *p, *tmp;
2866 int rem, i, sig;
2867 bool ismesh = false;
2868
2869 memset(&iwe, 0, sizeof(iwe));
2870 iwe.cmd = SIOCGIWAP;
2871 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
2872 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
2873 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2874 IW_EV_ADDR_LEN);
2875 if (IS_ERR(current_ev))
2876 return current_ev;
2877
2878 memset(&iwe, 0, sizeof(iwe));
2879 iwe.cmd = SIOCGIWFREQ;
2880 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
2881 iwe.u.freq.e = 0;
2882 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2883 IW_EV_FREQ_LEN);
2884 if (IS_ERR(current_ev))
2885 return current_ev;
2886
2887 memset(&iwe, 0, sizeof(iwe));
2888 iwe.cmd = SIOCGIWFREQ;
2889 iwe.u.freq.m = bss->pub.channel->center_freq;
2890 iwe.u.freq.e = 6;
2891 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2892 IW_EV_FREQ_LEN);
2893 if (IS_ERR(current_ev))
2894 return current_ev;
2895
2896 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
2897 memset(&iwe, 0, sizeof(iwe));
2898 iwe.cmd = IWEVQUAL;
2899 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
2900 IW_QUAL_NOISE_INVALID |
2901 IW_QUAL_QUAL_UPDATED;
2902 switch (wiphy->signal_type) {
2903 case CFG80211_SIGNAL_TYPE_MBM:
2904 sig = bss->pub.signal / 100;
2905 iwe.u.qual.level = sig;
2906 iwe.u.qual.updated |= IW_QUAL_DBM;
2907 if (sig < -110) /* rather bad */
2908 sig = -110;
2909 else if (sig > -40) /* perfect */
2910 sig = -40;
2911 /* will give a range of 0 .. 70 */
2912 iwe.u.qual.qual = sig + 110;
2913 break;
2914 case CFG80211_SIGNAL_TYPE_UNSPEC:
2915 iwe.u.qual.level = bss->pub.signal;
2916 /* will give range 0 .. 100 */
2917 iwe.u.qual.qual = bss->pub.signal;
2918 break;
2919 default:
2920 /* not reached */
2921 break;
2922 }
2923 current_ev = iwe_stream_add_event_check(info, current_ev,
2924 end_buf, &iwe,
2925 IW_EV_QUAL_LEN);
2926 if (IS_ERR(current_ev))
2927 return current_ev;
2928 }
2929
2930 memset(&iwe, 0, sizeof(iwe));
2931 iwe.cmd = SIOCGIWENCODE;
2932 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
2933 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
2934 else
2935 iwe.u.data.flags = IW_ENCODE_DISABLED;
2936 iwe.u.data.length = 0;
2937 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
2938 &iwe, "");
2939 if (IS_ERR(current_ev))
2940 return current_ev;
2941
2942 rcu_read_lock();
2943 ies = rcu_dereference(bss->pub.ies);
2944 rem = ies->len;
2945 ie = ies->data;
2946
2947 while (rem >= 2) {
2948 /* invalid data */
2949 if (ie[1] > rem - 2)
2950 break;
2951
2952 switch (ie[0]) {
2953 case WLAN_EID_SSID:
2954 memset(&iwe, 0, sizeof(iwe));
2955 iwe.cmd = SIOCGIWESSID;
2956 iwe.u.data.length = ie[1];
2957 iwe.u.data.flags = 1;
2958 current_ev = iwe_stream_add_point_check(info,
2959 current_ev,
2960 end_buf, &iwe,
2961 (u8 *)ie + 2);
2962 if (IS_ERR(current_ev))
2963 goto unlock;
2964 break;
2965 case WLAN_EID_MESH_ID:
2966 memset(&iwe, 0, sizeof(iwe));
2967 iwe.cmd = SIOCGIWESSID;
2968 iwe.u.data.length = ie[1];
2969 iwe.u.data.flags = 1;
2970 current_ev = iwe_stream_add_point_check(info,
2971 current_ev,
2972 end_buf, &iwe,
2973 (u8 *)ie + 2);
2974 if (IS_ERR(current_ev))
2975 goto unlock;
2976 break;
2977 case WLAN_EID_MESH_CONFIG:
2978 ismesh = true;
2979 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
2980 break;
2981 cfg = (u8 *)ie + 2;
2982 memset(&iwe, 0, sizeof(iwe));
2983 iwe.cmd = IWEVCUSTOM;
2984 sprintf(buf, "Mesh Network Path Selection Protocol ID: "
2985 "0x%02X", cfg[0]);
2986 iwe.u.data.length = strlen(buf);
2987 current_ev = iwe_stream_add_point_check(info,
2988 current_ev,
2989 end_buf,
2990 &iwe, buf);
2991 if (IS_ERR(current_ev))
2992 goto unlock;
2993 sprintf(buf, "Path Selection Metric ID: 0x%02X",
2994 cfg[1]);
2995 iwe.u.data.length = strlen(buf);
2996 current_ev = iwe_stream_add_point_check(info,
2997 current_ev,
2998 end_buf,
2999 &iwe, buf);
3000 if (IS_ERR(current_ev))
3001 goto unlock;
3002 sprintf(buf, "Congestion Control Mode ID: 0x%02X",
3003 cfg[2]);
3004 iwe.u.data.length = strlen(buf);
3005 current_ev = iwe_stream_add_point_check(info,
3006 current_ev,
3007 end_buf,
3008 &iwe, buf);
3009 if (IS_ERR(current_ev))
3010 goto unlock;
3011 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
3012 iwe.u.data.length = strlen(buf);
3013 current_ev = iwe_stream_add_point_check(info,
3014 current_ev,
3015 end_buf,
3016 &iwe, buf);
3017 if (IS_ERR(current_ev))
3018 goto unlock;
3019 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
3020 iwe.u.data.length = strlen(buf);
3021 current_ev = iwe_stream_add_point_check(info,
3022 current_ev,
3023 end_buf,
3024 &iwe, buf);
3025 if (IS_ERR(current_ev))
3026 goto unlock;
3027 sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
3028 iwe.u.data.length = strlen(buf);
3029 current_ev = iwe_stream_add_point_check(info,
3030 current_ev,
3031 end_buf,
3032 &iwe, buf);
3033 if (IS_ERR(current_ev))
3034 goto unlock;
3035 sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
3036 iwe.u.data.length = strlen(buf);
3037 current_ev = iwe_stream_add_point_check(info,
3038 current_ev,
3039 end_buf,
3040 &iwe, buf);
3041 if (IS_ERR(current_ev))
3042 goto unlock;
3043 break;
3044 case WLAN_EID_SUPP_RATES:
3045 case WLAN_EID_EXT_SUPP_RATES:
3046 /* display all supported rates in readable format */
3047 p = current_ev + iwe_stream_lcp_len(info);
3048
3049 memset(&iwe, 0, sizeof(iwe));
3050 iwe.cmd = SIOCGIWRATE;
3051 /* Those two flags are ignored... */
3052 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
3053
3054 for (i = 0; i < ie[1]; i++) {
3055 iwe.u.bitrate.value =
3056 ((ie[i + 2] & 0x7f) * 500000);
3057 tmp = p;
3058 p = iwe_stream_add_value(info, current_ev, p,
3059 end_buf, &iwe,
3060 IW_EV_PARAM_LEN);
3061 if (p == tmp) {
3062 current_ev = ERR_PTR(-E2BIG);
3063 goto unlock;
3064 }
3065 }
3066 current_ev = p;
3067 break;
3068 }
3069 rem -= ie[1] + 2;
3070 ie += ie[1] + 2;
3071 }
3072
3073 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
3074 ismesh) {
3075 memset(&iwe, 0, sizeof(iwe));
3076 iwe.cmd = SIOCGIWMODE;
3077 if (ismesh)
3078 iwe.u.mode = IW_MODE_MESH;
3079 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
3080 iwe.u.mode = IW_MODE_MASTER;
3081 else
3082 iwe.u.mode = IW_MODE_ADHOC;
3083 current_ev = iwe_stream_add_event_check(info, current_ev,
3084 end_buf, &iwe,
3085 IW_EV_UINT_LEN);
3086 if (IS_ERR(current_ev))
3087 goto unlock;
3088 }
3089
3090 memset(&iwe, 0, sizeof(iwe));
3091 iwe.cmd = IWEVCUSTOM;
3092 sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf));
3093 iwe.u.data.length = strlen(buf);
3094 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
3095 &iwe, buf);
3096 if (IS_ERR(current_ev))
3097 goto unlock;
3098 memset(&iwe, 0, sizeof(iwe));
3099 iwe.cmd = IWEVCUSTOM;
3100 sprintf(buf, " Last beacon: %ums ago",
3101 elapsed_jiffies_msecs(bss->ts));
3102 iwe.u.data.length = strlen(buf);
3103 current_ev = iwe_stream_add_point_check(info, current_ev,
3104 end_buf, &iwe, buf);
3105 if (IS_ERR(current_ev))
3106 goto unlock;
3107
3108 current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf);
3109
3110 unlock:
3111 rcu_read_unlock();
3112 return current_ev;
3113}
3114
3115
3116static int ieee80211_scan_results(struct cfg80211_registered_device *rdev,
3117 struct iw_request_info *info,
3118 char *buf, size_t len)
3119{
3120 char *current_ev = buf;
3121 char *end_buf = buf + len;
3122 struct cfg80211_internal_bss *bss;
3123 int err = 0;
3124
3125 spin_lock_bh(&rdev->bss_lock);
3126 cfg80211_bss_expire(rdev);
3127
3128 list_for_each_entry(bss, &rdev->bss_list, list) {
3129 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
3130 err = -E2BIG;
3131 break;
3132 }
3133 current_ev = ieee80211_bss(&rdev->wiphy, info, bss,
3134 current_ev, end_buf);
3135 if (IS_ERR(current_ev)) {
3136 err = PTR_ERR(current_ev);
3137 break;
3138 }
3139 }
3140 spin_unlock_bh(&rdev->bss_lock);
3141
3142 if (err)
3143 return err;
3144 return current_ev - buf;
3145}
3146
3147
3148int cfg80211_wext_giwscan(struct net_device *dev,
3149 struct iw_request_info *info,
3150 struct iw_point *data, char *extra)
3151{
3152 struct cfg80211_registered_device *rdev;
3153 int res;
3154
3155 if (!netif_running(dev))
3156 return -ENETDOWN;
3157
3158 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
3159
3160 if (IS_ERR(rdev))
3161 return PTR_ERR(rdev);
3162
3163 if (rdev->scan_req || rdev->scan_msg)
3164 return -EAGAIN;
3165
3166 res = ieee80211_scan_results(rdev, info, extra, data->length);
3167 data->length = 0;
3168 if (res >= 0) {
3169 data->length = res;
3170 res = 0;
3171 }
3172
3173 return res;
3174}
3175EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan);
3176#endif
1/*
2 * cfg80211 scan result handling
3 *
4 * Copyright 2008 Johannes Berg <johannes@sipsolutions.net>
5 */
6#include <linux/kernel.h>
7#include <linux/slab.h>
8#include <linux/module.h>
9#include <linux/netdevice.h>
10#include <linux/wireless.h>
11#include <linux/nl80211.h>
12#include <linux/etherdevice.h>
13#include <net/arp.h>
14#include <net/cfg80211.h>
15#include <net/iw_handler.h>
16#include "core.h"
17#include "nl80211.h"
18#include "wext-compat.h"
19
20#define IEEE80211_SCAN_RESULT_EXPIRE (15 * HZ)
21
22void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak)
23{
24 struct cfg80211_scan_request *request;
25 struct net_device *dev;
26#ifdef CONFIG_CFG80211_WEXT
27 union iwreq_data wrqu;
28#endif
29
30 ASSERT_RDEV_LOCK(rdev);
31
32 request = rdev->scan_req;
33
34 if (!request)
35 return;
36
37 dev = request->dev;
38
39 /*
40 * This must be before sending the other events!
41 * Otherwise, wpa_supplicant gets completely confused with
42 * wext events.
43 */
44 cfg80211_sme_scan_done(dev);
45
46 if (request->aborted)
47 nl80211_send_scan_aborted(rdev, dev);
48 else
49 nl80211_send_scan_done(rdev, dev);
50
51#ifdef CONFIG_CFG80211_WEXT
52 if (!request->aborted) {
53 memset(&wrqu, 0, sizeof(wrqu));
54
55 wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
56 }
57#endif
58
59 dev_put(dev);
60
61 rdev->scan_req = NULL;
62
63 /*
64 * OK. If this is invoked with "leak" then we can't
65 * free this ... but we've cleaned it up anyway. The
66 * driver failed to call the scan_done callback, so
67 * all bets are off, it might still be trying to use
68 * the scan request or not ... if it accesses the dev
69 * in there (it shouldn't anyway) then it may crash.
70 */
71 if (!leak)
72 kfree(request);
73}
74
75void __cfg80211_scan_done(struct work_struct *wk)
76{
77 struct cfg80211_registered_device *rdev;
78
79 rdev = container_of(wk, struct cfg80211_registered_device,
80 scan_done_wk);
81
82 cfg80211_lock_rdev(rdev);
83 ___cfg80211_scan_done(rdev, false);
84 cfg80211_unlock_rdev(rdev);
85}
86
87void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted)
88{
89 WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req);
90
91 request->aborted = aborted;
92 queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk);
93}
94EXPORT_SYMBOL(cfg80211_scan_done);
95
96void __cfg80211_sched_scan_results(struct work_struct *wk)
97{
98 struct cfg80211_registered_device *rdev;
99
100 rdev = container_of(wk, struct cfg80211_registered_device,
101 sched_scan_results_wk);
102
103 mutex_lock(&rdev->sched_scan_mtx);
104
105 /* we don't have sched_scan_req anymore if the scan is stopping */
106 if (rdev->sched_scan_req)
107 nl80211_send_sched_scan_results(rdev,
108 rdev->sched_scan_req->dev);
109
110 mutex_unlock(&rdev->sched_scan_mtx);
111}
112
113void cfg80211_sched_scan_results(struct wiphy *wiphy)
114{
115 /* ignore if we're not scanning */
116 if (wiphy_to_dev(wiphy)->sched_scan_req)
117 queue_work(cfg80211_wq,
118 &wiphy_to_dev(wiphy)->sched_scan_results_wk);
119}
120EXPORT_SYMBOL(cfg80211_sched_scan_results);
121
122void cfg80211_sched_scan_stopped(struct wiphy *wiphy)
123{
124 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
125
126 mutex_lock(&rdev->sched_scan_mtx);
127 __cfg80211_stop_sched_scan(rdev, true);
128 mutex_unlock(&rdev->sched_scan_mtx);
129}
130EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
131
132int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
133 bool driver_initiated)
134{
135 struct net_device *dev;
136
137 lockdep_assert_held(&rdev->sched_scan_mtx);
138
139 if (!rdev->sched_scan_req)
140 return -ENOENT;
141
142 dev = rdev->sched_scan_req->dev;
143
144 if (!driver_initiated) {
145 int err = rdev->ops->sched_scan_stop(&rdev->wiphy, dev);
146 if (err)
147 return err;
148 }
149
150 nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED);
151
152 kfree(rdev->sched_scan_req);
153 rdev->sched_scan_req = NULL;
154
155 return 0;
156}
157
158static void bss_release(struct kref *ref)
159{
160 struct cfg80211_internal_bss *bss;
161
162 bss = container_of(ref, struct cfg80211_internal_bss, ref);
163 if (bss->pub.free_priv)
164 bss->pub.free_priv(&bss->pub);
165
166 if (bss->beacon_ies_allocated)
167 kfree(bss->pub.beacon_ies);
168 if (bss->proberesp_ies_allocated)
169 kfree(bss->pub.proberesp_ies);
170
171 BUG_ON(atomic_read(&bss->hold));
172
173 kfree(bss);
174}
175
176/* must hold dev->bss_lock! */
177void cfg80211_bss_age(struct cfg80211_registered_device *dev,
178 unsigned long age_secs)
179{
180 struct cfg80211_internal_bss *bss;
181 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
182
183 list_for_each_entry(bss, &dev->bss_list, list) {
184 bss->ts -= age_jiffies;
185 }
186}
187
188/* must hold dev->bss_lock! */
189static void __cfg80211_unlink_bss(struct cfg80211_registered_device *dev,
190 struct cfg80211_internal_bss *bss)
191{
192 list_del_init(&bss->list);
193 rb_erase(&bss->rbn, &dev->bss_tree);
194 kref_put(&bss->ref, bss_release);
195}
196
197/* must hold dev->bss_lock! */
198void cfg80211_bss_expire(struct cfg80211_registered_device *dev)
199{
200 struct cfg80211_internal_bss *bss, *tmp;
201 bool expired = false;
202
203 list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) {
204 if (atomic_read(&bss->hold))
205 continue;
206 if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE))
207 continue;
208 __cfg80211_unlink_bss(dev, bss);
209 expired = true;
210 }
211
212 if (expired)
213 dev->bss_generation++;
214}
215
216const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len)
217{
218 while (len > 2 && ies[0] != eid) {
219 len -= ies[1] + 2;
220 ies += ies[1] + 2;
221 }
222 if (len < 2)
223 return NULL;
224 if (len < 2 + ies[1])
225 return NULL;
226 return ies;
227}
228EXPORT_SYMBOL(cfg80211_find_ie);
229
230static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2)
231{
232 const u8 *ie1 = cfg80211_find_ie(num, ies1, len1);
233 const u8 *ie2 = cfg80211_find_ie(num, ies2, len2);
234 int r;
235
236 if (!ie1 && !ie2)
237 return 0;
238 if (!ie1 || !ie2)
239 return -1;
240
241 r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1]));
242 if (r == 0 && ie1[1] != ie2[1])
243 return ie2[1] - ie1[1];
244 return r;
245}
246
247static bool is_bss(struct cfg80211_bss *a,
248 const u8 *bssid,
249 const u8 *ssid, size_t ssid_len)
250{
251 const u8 *ssidie;
252
253 if (bssid && compare_ether_addr(a->bssid, bssid))
254 return false;
255
256 if (!ssid)
257 return true;
258
259 ssidie = cfg80211_find_ie(WLAN_EID_SSID,
260 a->information_elements,
261 a->len_information_elements);
262 if (!ssidie)
263 return false;
264 if (ssidie[1] != ssid_len)
265 return false;
266 return memcmp(ssidie + 2, ssid, ssid_len) == 0;
267}
268
269static bool is_mesh_bss(struct cfg80211_bss *a)
270{
271 const u8 *ie;
272
273 if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability))
274 return false;
275
276 ie = cfg80211_find_ie(WLAN_EID_MESH_ID,
277 a->information_elements,
278 a->len_information_elements);
279 if (!ie)
280 return false;
281
282 ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
283 a->information_elements,
284 a->len_information_elements);
285 if (!ie)
286 return false;
287
288 return true;
289}
290
291static bool is_mesh(struct cfg80211_bss *a,
292 const u8 *meshid, size_t meshidlen,
293 const u8 *meshcfg)
294{
295 const u8 *ie;
296
297 if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability))
298 return false;
299
300 ie = cfg80211_find_ie(WLAN_EID_MESH_ID,
301 a->information_elements,
302 a->len_information_elements);
303 if (!ie)
304 return false;
305 if (ie[1] != meshidlen)
306 return false;
307 if (memcmp(ie + 2, meshid, meshidlen))
308 return false;
309
310 ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
311 a->information_elements,
312 a->len_information_elements);
313 if (!ie)
314 return false;
315 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
316 return false;
317
318 /*
319 * Ignore mesh capability (last two bytes of the IE) when
320 * comparing since that may differ between stations taking
321 * part in the same mesh.
322 */
323 return memcmp(ie + 2, meshcfg,
324 sizeof(struct ieee80211_meshconf_ie) - 2) == 0;
325}
326
327static int cmp_bss(struct cfg80211_bss *a,
328 struct cfg80211_bss *b)
329{
330 int r;
331
332 if (a->channel != b->channel)
333 return b->channel->center_freq - a->channel->center_freq;
334
335 if (is_mesh_bss(a) && is_mesh_bss(b)) {
336 r = cmp_ies(WLAN_EID_MESH_ID,
337 a->information_elements,
338 a->len_information_elements,
339 b->information_elements,
340 b->len_information_elements);
341 if (r)
342 return r;
343 return cmp_ies(WLAN_EID_MESH_CONFIG,
344 a->information_elements,
345 a->len_information_elements,
346 b->information_elements,
347 b->len_information_elements);
348 }
349
350 r = memcmp(a->bssid, b->bssid, ETH_ALEN);
351 if (r)
352 return r;
353
354 return cmp_ies(WLAN_EID_SSID,
355 a->information_elements,
356 a->len_information_elements,
357 b->information_elements,
358 b->len_information_elements);
359}
360
361struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
362 struct ieee80211_channel *channel,
363 const u8 *bssid,
364 const u8 *ssid, size_t ssid_len,
365 u16 capa_mask, u16 capa_val)
366{
367 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
368 struct cfg80211_internal_bss *bss, *res = NULL;
369 unsigned long now = jiffies;
370
371 spin_lock_bh(&dev->bss_lock);
372
373 list_for_each_entry(bss, &dev->bss_list, list) {
374 if ((bss->pub.capability & capa_mask) != capa_val)
375 continue;
376 if (channel && bss->pub.channel != channel)
377 continue;
378 /* Don't get expired BSS structs */
379 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
380 !atomic_read(&bss->hold))
381 continue;
382 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
383 res = bss;
384 kref_get(&res->ref);
385 break;
386 }
387 }
388
389 spin_unlock_bh(&dev->bss_lock);
390 if (!res)
391 return NULL;
392 return &res->pub;
393}
394EXPORT_SYMBOL(cfg80211_get_bss);
395
396struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy,
397 struct ieee80211_channel *channel,
398 const u8 *meshid, size_t meshidlen,
399 const u8 *meshcfg)
400{
401 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
402 struct cfg80211_internal_bss *bss, *res = NULL;
403
404 spin_lock_bh(&dev->bss_lock);
405
406 list_for_each_entry(bss, &dev->bss_list, list) {
407 if (channel && bss->pub.channel != channel)
408 continue;
409 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) {
410 res = bss;
411 kref_get(&res->ref);
412 break;
413 }
414 }
415
416 spin_unlock_bh(&dev->bss_lock);
417 if (!res)
418 return NULL;
419 return &res->pub;
420}
421EXPORT_SYMBOL(cfg80211_get_mesh);
422
423
424static void rb_insert_bss(struct cfg80211_registered_device *dev,
425 struct cfg80211_internal_bss *bss)
426{
427 struct rb_node **p = &dev->bss_tree.rb_node;
428 struct rb_node *parent = NULL;
429 struct cfg80211_internal_bss *tbss;
430 int cmp;
431
432 while (*p) {
433 parent = *p;
434 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
435
436 cmp = cmp_bss(&bss->pub, &tbss->pub);
437
438 if (WARN_ON(!cmp)) {
439 /* will sort of leak this BSS */
440 return;
441 }
442
443 if (cmp < 0)
444 p = &(*p)->rb_left;
445 else
446 p = &(*p)->rb_right;
447 }
448
449 rb_link_node(&bss->rbn, parent, p);
450 rb_insert_color(&bss->rbn, &dev->bss_tree);
451}
452
453static struct cfg80211_internal_bss *
454rb_find_bss(struct cfg80211_registered_device *dev,
455 struct cfg80211_internal_bss *res)
456{
457 struct rb_node *n = dev->bss_tree.rb_node;
458 struct cfg80211_internal_bss *bss;
459 int r;
460
461 while (n) {
462 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
463 r = cmp_bss(&res->pub, &bss->pub);
464
465 if (r == 0)
466 return bss;
467 else if (r < 0)
468 n = n->rb_left;
469 else
470 n = n->rb_right;
471 }
472
473 return NULL;
474}
475
476static struct cfg80211_internal_bss *
477cfg80211_bss_update(struct cfg80211_registered_device *dev,
478 struct cfg80211_internal_bss *res)
479{
480 struct cfg80211_internal_bss *found = NULL;
481
482 /*
483 * The reference to "res" is donated to this function.
484 */
485
486 if (WARN_ON(!res->pub.channel)) {
487 kref_put(&res->ref, bss_release);
488 return NULL;
489 }
490
491 res->ts = jiffies;
492
493 spin_lock_bh(&dev->bss_lock);
494
495 found = rb_find_bss(dev, res);
496
497 if (found) {
498 found->pub.beacon_interval = res->pub.beacon_interval;
499 found->pub.tsf = res->pub.tsf;
500 found->pub.signal = res->pub.signal;
501 found->pub.capability = res->pub.capability;
502 found->ts = res->ts;
503
504 /* Update IEs */
505 if (res->pub.proberesp_ies) {
506 size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
507 size_t ielen = res->pub.len_proberesp_ies;
508
509 if (found->pub.proberesp_ies &&
510 !found->proberesp_ies_allocated &&
511 ksize(found) >= used + ielen) {
512 memcpy(found->pub.proberesp_ies,
513 res->pub.proberesp_ies, ielen);
514 found->pub.len_proberesp_ies = ielen;
515 } else {
516 u8 *ies = found->pub.proberesp_ies;
517
518 if (found->proberesp_ies_allocated)
519 ies = krealloc(ies, ielen, GFP_ATOMIC);
520 else
521 ies = kmalloc(ielen, GFP_ATOMIC);
522
523 if (ies) {
524 memcpy(ies, res->pub.proberesp_ies,
525 ielen);
526 found->proberesp_ies_allocated = true;
527 found->pub.proberesp_ies = ies;
528 found->pub.len_proberesp_ies = ielen;
529 }
530 }
531
532 /* Override possible earlier Beacon frame IEs */
533 found->pub.information_elements =
534 found->pub.proberesp_ies;
535 found->pub.len_information_elements =
536 found->pub.len_proberesp_ies;
537 }
538 if (res->pub.beacon_ies) {
539 size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
540 size_t ielen = res->pub.len_beacon_ies;
541 bool information_elements_is_beacon_ies =
542 (found->pub.information_elements ==
543 found->pub.beacon_ies);
544
545 if (found->pub.beacon_ies &&
546 !found->beacon_ies_allocated &&
547 ksize(found) >= used + ielen) {
548 memcpy(found->pub.beacon_ies,
549 res->pub.beacon_ies, ielen);
550 found->pub.len_beacon_ies = ielen;
551 } else {
552 u8 *ies = found->pub.beacon_ies;
553
554 if (found->beacon_ies_allocated)
555 ies = krealloc(ies, ielen, GFP_ATOMIC);
556 else
557 ies = kmalloc(ielen, GFP_ATOMIC);
558
559 if (ies) {
560 memcpy(ies, res->pub.beacon_ies,
561 ielen);
562 found->beacon_ies_allocated = true;
563 found->pub.beacon_ies = ies;
564 found->pub.len_beacon_ies = ielen;
565 }
566 }
567
568 /* Override IEs if they were from a beacon before */
569 if (information_elements_is_beacon_ies) {
570 found->pub.information_elements =
571 found->pub.beacon_ies;
572 found->pub.len_information_elements =
573 found->pub.len_beacon_ies;
574 }
575 }
576
577 kref_put(&res->ref, bss_release);
578 } else {
579 /* this "consumes" the reference */
580 list_add_tail(&res->list, &dev->bss_list);
581 rb_insert_bss(dev, res);
582 found = res;
583 }
584
585 dev->bss_generation++;
586 spin_unlock_bh(&dev->bss_lock);
587
588 kref_get(&found->ref);
589 return found;
590}
591
592struct cfg80211_bss*
593cfg80211_inform_bss(struct wiphy *wiphy,
594 struct ieee80211_channel *channel,
595 const u8 *bssid,
596 u64 timestamp, u16 capability, u16 beacon_interval,
597 const u8 *ie, size_t ielen,
598 s32 signal, gfp_t gfp)
599{
600 struct cfg80211_internal_bss *res;
601 size_t privsz;
602
603 if (WARN_ON(!wiphy))
604 return NULL;
605
606 privsz = wiphy->bss_priv_size;
607
608 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
609 (signal < 0 || signal > 100)))
610 return NULL;
611
612 res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
613 if (!res)
614 return NULL;
615
616 memcpy(res->pub.bssid, bssid, ETH_ALEN);
617 res->pub.channel = channel;
618 res->pub.signal = signal;
619 res->pub.tsf = timestamp;
620 res->pub.beacon_interval = beacon_interval;
621 res->pub.capability = capability;
622 /*
623 * Since we do not know here whether the IEs are from a Beacon or Probe
624 * Response frame, we need to pick one of the options and only use it
625 * with the driver that does not provide the full Beacon/Probe Response
626 * frame. Use Beacon frame pointer to avoid indicating that this should
627 * override the information_elements pointer should we have received an
628 * earlier indication of Probe Response data.
629 *
630 * The initial buffer for the IEs is allocated with the BSS entry and
631 * is located after the private area.
632 */
633 res->pub.beacon_ies = (u8 *)res + sizeof(*res) + privsz;
634 memcpy(res->pub.beacon_ies, ie, ielen);
635 res->pub.len_beacon_ies = ielen;
636 res->pub.information_elements = res->pub.beacon_ies;
637 res->pub.len_information_elements = res->pub.len_beacon_ies;
638
639 kref_init(&res->ref);
640
641 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res);
642 if (!res)
643 return NULL;
644
645 if (res->pub.capability & WLAN_CAPABILITY_ESS)
646 regulatory_hint_found_beacon(wiphy, channel, gfp);
647
648 /* cfg80211_bss_update gives us a referenced result */
649 return &res->pub;
650}
651EXPORT_SYMBOL(cfg80211_inform_bss);
652
653struct cfg80211_bss *
654cfg80211_inform_bss_frame(struct wiphy *wiphy,
655 struct ieee80211_channel *channel,
656 struct ieee80211_mgmt *mgmt, size_t len,
657 s32 signal, gfp_t gfp)
658{
659 struct cfg80211_internal_bss *res;
660 size_t ielen = len - offsetof(struct ieee80211_mgmt,
661 u.probe_resp.variable);
662 size_t privsz;
663
664 if (WARN_ON(!mgmt))
665 return NULL;
666
667 if (WARN_ON(!wiphy))
668 return NULL;
669
670 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
671 (signal < 0 || signal > 100)))
672 return NULL;
673
674 if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
675 return NULL;
676
677 privsz = wiphy->bss_priv_size;
678
679 res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
680 if (!res)
681 return NULL;
682
683 memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN);
684 res->pub.channel = channel;
685 res->pub.signal = signal;
686 res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
687 res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
688 res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
689 /*
690 * The initial buffer for the IEs is allocated with the BSS entry and
691 * is located after the private area.
692 */
693 if (ieee80211_is_probe_resp(mgmt->frame_control)) {
694 res->pub.proberesp_ies = (u8 *) res + sizeof(*res) + privsz;
695 memcpy(res->pub.proberesp_ies, mgmt->u.probe_resp.variable,
696 ielen);
697 res->pub.len_proberesp_ies = ielen;
698 res->pub.information_elements = res->pub.proberesp_ies;
699 res->pub.len_information_elements = res->pub.len_proberesp_ies;
700 } else {
701 res->pub.beacon_ies = (u8 *) res + sizeof(*res) + privsz;
702 memcpy(res->pub.beacon_ies, mgmt->u.beacon.variable, ielen);
703 res->pub.len_beacon_ies = ielen;
704 res->pub.information_elements = res->pub.beacon_ies;
705 res->pub.len_information_elements = res->pub.len_beacon_ies;
706 }
707
708 kref_init(&res->ref);
709
710 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res);
711 if (!res)
712 return NULL;
713
714 if (res->pub.capability & WLAN_CAPABILITY_ESS)
715 regulatory_hint_found_beacon(wiphy, channel, gfp);
716
717 /* cfg80211_bss_update gives us a referenced result */
718 return &res->pub;
719}
720EXPORT_SYMBOL(cfg80211_inform_bss_frame);
721
722void cfg80211_put_bss(struct cfg80211_bss *pub)
723{
724 struct cfg80211_internal_bss *bss;
725
726 if (!pub)
727 return;
728
729 bss = container_of(pub, struct cfg80211_internal_bss, pub);
730 kref_put(&bss->ref, bss_release);
731}
732EXPORT_SYMBOL(cfg80211_put_bss);
733
734void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
735{
736 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
737 struct cfg80211_internal_bss *bss;
738
739 if (WARN_ON(!pub))
740 return;
741
742 bss = container_of(pub, struct cfg80211_internal_bss, pub);
743
744 spin_lock_bh(&dev->bss_lock);
745 if (!list_empty(&bss->list)) {
746 __cfg80211_unlink_bss(dev, bss);
747 dev->bss_generation++;
748 }
749 spin_unlock_bh(&dev->bss_lock);
750}
751EXPORT_SYMBOL(cfg80211_unlink_bss);
752
753#ifdef CONFIG_CFG80211_WEXT
754int cfg80211_wext_siwscan(struct net_device *dev,
755 struct iw_request_info *info,
756 union iwreq_data *wrqu, char *extra)
757{
758 struct cfg80211_registered_device *rdev;
759 struct wiphy *wiphy;
760 struct iw_scan_req *wreq = NULL;
761 struct cfg80211_scan_request *creq = NULL;
762 int i, err, n_channels = 0;
763 enum ieee80211_band band;
764
765 if (!netif_running(dev))
766 return -ENETDOWN;
767
768 if (wrqu->data.length == sizeof(struct iw_scan_req))
769 wreq = (struct iw_scan_req *)extra;
770
771 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
772
773 if (IS_ERR(rdev))
774 return PTR_ERR(rdev);
775
776 if (rdev->scan_req) {
777 err = -EBUSY;
778 goto out;
779 }
780
781 wiphy = &rdev->wiphy;
782
783 /* Determine number of channels, needed to allocate creq */
784 if (wreq && wreq->num_channels)
785 n_channels = wreq->num_channels;
786 else {
787 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
788 if (wiphy->bands[band])
789 n_channels += wiphy->bands[band]->n_channels;
790 }
791
792 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
793 n_channels * sizeof(void *),
794 GFP_ATOMIC);
795 if (!creq) {
796 err = -ENOMEM;
797 goto out;
798 }
799
800 creq->wiphy = wiphy;
801 creq->dev = dev;
802 /* SSIDs come after channels */
803 creq->ssids = (void *)&creq->channels[n_channels];
804 creq->n_channels = n_channels;
805 creq->n_ssids = 1;
806
807 /* translate "Scan on frequencies" request */
808 i = 0;
809 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
810 int j;
811
812 if (!wiphy->bands[band])
813 continue;
814
815 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
816 /* ignore disabled channels */
817 if (wiphy->bands[band]->channels[j].flags &
818 IEEE80211_CHAN_DISABLED)
819 continue;
820
821 /* If we have a wireless request structure and the
822 * wireless request specifies frequencies, then search
823 * for the matching hardware channel.
824 */
825 if (wreq && wreq->num_channels) {
826 int k;
827 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
828 for (k = 0; k < wreq->num_channels; k++) {
829 int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]);
830 if (wext_freq == wiphy_freq)
831 goto wext_freq_found;
832 }
833 goto wext_freq_not_found;
834 }
835
836 wext_freq_found:
837 creq->channels[i] = &wiphy->bands[band]->channels[j];
838 i++;
839 wext_freq_not_found: ;
840 }
841 }
842 /* No channels found? */
843 if (!i) {
844 err = -EINVAL;
845 goto out;
846 }
847
848 /* Set real number of channels specified in creq->channels[] */
849 creq->n_channels = i;
850
851 /* translate "Scan for SSID" request */
852 if (wreq) {
853 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
854 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
855 err = -EINVAL;
856 goto out;
857 }
858 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
859 creq->ssids[0].ssid_len = wreq->essid_len;
860 }
861 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
862 creq->n_ssids = 0;
863 }
864
865 for (i = 0; i < IEEE80211_NUM_BANDS; i++)
866 if (wiphy->bands[i])
867 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
868
869 rdev->scan_req = creq;
870 err = rdev->ops->scan(wiphy, dev, creq);
871 if (err) {
872 rdev->scan_req = NULL;
873 /* creq will be freed below */
874 } else {
875 nl80211_send_scan_start(rdev, dev);
876 /* creq now owned by driver */
877 creq = NULL;
878 dev_hold(dev);
879 }
880 out:
881 kfree(creq);
882 cfg80211_unlock_rdev(rdev);
883 return err;
884}
885EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan);
886
887static void ieee80211_scan_add_ies(struct iw_request_info *info,
888 struct cfg80211_bss *bss,
889 char **current_ev, char *end_buf)
890{
891 u8 *pos, *end, *next;
892 struct iw_event iwe;
893
894 if (!bss->information_elements ||
895 !bss->len_information_elements)
896 return;
897
898 /*
899 * If needed, fragment the IEs buffer (at IE boundaries) into short
900 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
901 */
902 pos = bss->information_elements;
903 end = pos + bss->len_information_elements;
904
905 while (end - pos > IW_GENERIC_IE_MAX) {
906 next = pos + 2 + pos[1];
907 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
908 next = next + 2 + next[1];
909
910 memset(&iwe, 0, sizeof(iwe));
911 iwe.cmd = IWEVGENIE;
912 iwe.u.data.length = next - pos;
913 *current_ev = iwe_stream_add_point(info, *current_ev,
914 end_buf, &iwe, pos);
915
916 pos = next;
917 }
918
919 if (end > pos) {
920 memset(&iwe, 0, sizeof(iwe));
921 iwe.cmd = IWEVGENIE;
922 iwe.u.data.length = end - pos;
923 *current_ev = iwe_stream_add_point(info, *current_ev,
924 end_buf, &iwe, pos);
925 }
926}
927
928static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
929{
930 unsigned long end = jiffies;
931
932 if (end >= start)
933 return jiffies_to_msecs(end - start);
934
935 return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1);
936}
937
938static char *
939ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
940 struct cfg80211_internal_bss *bss, char *current_ev,
941 char *end_buf)
942{
943 struct iw_event iwe;
944 u8 *buf, *cfg, *p;
945 u8 *ie = bss->pub.information_elements;
946 int rem = bss->pub.len_information_elements, i, sig;
947 bool ismesh = false;
948
949 memset(&iwe, 0, sizeof(iwe));
950 iwe.cmd = SIOCGIWAP;
951 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
952 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
953 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
954 IW_EV_ADDR_LEN);
955
956 memset(&iwe, 0, sizeof(iwe));
957 iwe.cmd = SIOCGIWFREQ;
958 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
959 iwe.u.freq.e = 0;
960 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
961 IW_EV_FREQ_LEN);
962
963 memset(&iwe, 0, sizeof(iwe));
964 iwe.cmd = SIOCGIWFREQ;
965 iwe.u.freq.m = bss->pub.channel->center_freq;
966 iwe.u.freq.e = 6;
967 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
968 IW_EV_FREQ_LEN);
969
970 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
971 memset(&iwe, 0, sizeof(iwe));
972 iwe.cmd = IWEVQUAL;
973 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
974 IW_QUAL_NOISE_INVALID |
975 IW_QUAL_QUAL_UPDATED;
976 switch (wiphy->signal_type) {
977 case CFG80211_SIGNAL_TYPE_MBM:
978 sig = bss->pub.signal / 100;
979 iwe.u.qual.level = sig;
980 iwe.u.qual.updated |= IW_QUAL_DBM;
981 if (sig < -110) /* rather bad */
982 sig = -110;
983 else if (sig > -40) /* perfect */
984 sig = -40;
985 /* will give a range of 0 .. 70 */
986 iwe.u.qual.qual = sig + 110;
987 break;
988 case CFG80211_SIGNAL_TYPE_UNSPEC:
989 iwe.u.qual.level = bss->pub.signal;
990 /* will give range 0 .. 100 */
991 iwe.u.qual.qual = bss->pub.signal;
992 break;
993 default:
994 /* not reached */
995 break;
996 }
997 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
998 &iwe, IW_EV_QUAL_LEN);
999 }
1000
1001 memset(&iwe, 0, sizeof(iwe));
1002 iwe.cmd = SIOCGIWENCODE;
1003 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
1004 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1005 else
1006 iwe.u.data.flags = IW_ENCODE_DISABLED;
1007 iwe.u.data.length = 0;
1008 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1009 &iwe, "");
1010
1011 while (rem >= 2) {
1012 /* invalid data */
1013 if (ie[1] > rem - 2)
1014 break;
1015
1016 switch (ie[0]) {
1017 case WLAN_EID_SSID:
1018 memset(&iwe, 0, sizeof(iwe));
1019 iwe.cmd = SIOCGIWESSID;
1020 iwe.u.data.length = ie[1];
1021 iwe.u.data.flags = 1;
1022 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1023 &iwe, ie + 2);
1024 break;
1025 case WLAN_EID_MESH_ID:
1026 memset(&iwe, 0, sizeof(iwe));
1027 iwe.cmd = SIOCGIWESSID;
1028 iwe.u.data.length = ie[1];
1029 iwe.u.data.flags = 1;
1030 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1031 &iwe, ie + 2);
1032 break;
1033 case WLAN_EID_MESH_CONFIG:
1034 ismesh = true;
1035 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
1036 break;
1037 buf = kmalloc(50, GFP_ATOMIC);
1038 if (!buf)
1039 break;
1040 cfg = ie + 2;
1041 memset(&iwe, 0, sizeof(iwe));
1042 iwe.cmd = IWEVCUSTOM;
1043 sprintf(buf, "Mesh Network Path Selection Protocol ID: "
1044 "0x%02X", cfg[0]);
1045 iwe.u.data.length = strlen(buf);
1046 current_ev = iwe_stream_add_point(info, current_ev,
1047 end_buf,
1048 &iwe, buf);
1049 sprintf(buf, "Path Selection Metric ID: 0x%02X",
1050 cfg[1]);
1051 iwe.u.data.length = strlen(buf);
1052 current_ev = iwe_stream_add_point(info, current_ev,
1053 end_buf,
1054 &iwe, buf);
1055 sprintf(buf, "Congestion Control Mode ID: 0x%02X",
1056 cfg[2]);
1057 iwe.u.data.length = strlen(buf);
1058 current_ev = iwe_stream_add_point(info, current_ev,
1059 end_buf,
1060 &iwe, buf);
1061 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
1062 iwe.u.data.length = strlen(buf);
1063 current_ev = iwe_stream_add_point(info, current_ev,
1064 end_buf,
1065 &iwe, buf);
1066 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
1067 iwe.u.data.length = strlen(buf);
1068 current_ev = iwe_stream_add_point(info, current_ev,
1069 end_buf,
1070 &iwe, buf);
1071 sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
1072 iwe.u.data.length = strlen(buf);
1073 current_ev = iwe_stream_add_point(info, current_ev,
1074 end_buf,
1075 &iwe, buf);
1076 sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
1077 iwe.u.data.length = strlen(buf);
1078 current_ev = iwe_stream_add_point(info, current_ev,
1079 end_buf,
1080 &iwe, buf);
1081 kfree(buf);
1082 break;
1083 case WLAN_EID_SUPP_RATES:
1084 case WLAN_EID_EXT_SUPP_RATES:
1085 /* display all supported rates in readable format */
1086 p = current_ev + iwe_stream_lcp_len(info);
1087
1088 memset(&iwe, 0, sizeof(iwe));
1089 iwe.cmd = SIOCGIWRATE;
1090 /* Those two flags are ignored... */
1091 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
1092
1093 for (i = 0; i < ie[1]; i++) {
1094 iwe.u.bitrate.value =
1095 ((ie[i + 2] & 0x7f) * 500000);
1096 p = iwe_stream_add_value(info, current_ev, p,
1097 end_buf, &iwe, IW_EV_PARAM_LEN);
1098 }
1099 current_ev = p;
1100 break;
1101 }
1102 rem -= ie[1] + 2;
1103 ie += ie[1] + 2;
1104 }
1105
1106 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
1107 ismesh) {
1108 memset(&iwe, 0, sizeof(iwe));
1109 iwe.cmd = SIOCGIWMODE;
1110 if (ismesh)
1111 iwe.u.mode = IW_MODE_MESH;
1112 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
1113 iwe.u.mode = IW_MODE_MASTER;
1114 else
1115 iwe.u.mode = IW_MODE_ADHOC;
1116 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
1117 &iwe, IW_EV_UINT_LEN);
1118 }
1119
1120 buf = kmalloc(30, GFP_ATOMIC);
1121 if (buf) {
1122 memset(&iwe, 0, sizeof(iwe));
1123 iwe.cmd = IWEVCUSTOM;
1124 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf));
1125 iwe.u.data.length = strlen(buf);
1126 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1127 &iwe, buf);
1128 memset(&iwe, 0, sizeof(iwe));
1129 iwe.cmd = IWEVCUSTOM;
1130 sprintf(buf, " Last beacon: %ums ago",
1131 elapsed_jiffies_msecs(bss->ts));
1132 iwe.u.data.length = strlen(buf);
1133 current_ev = iwe_stream_add_point(info, current_ev,
1134 end_buf, &iwe, buf);
1135 kfree(buf);
1136 }
1137
1138 ieee80211_scan_add_ies(info, &bss->pub, ¤t_ev, end_buf);
1139
1140 return current_ev;
1141}
1142
1143
1144static int ieee80211_scan_results(struct cfg80211_registered_device *dev,
1145 struct iw_request_info *info,
1146 char *buf, size_t len)
1147{
1148 char *current_ev = buf;
1149 char *end_buf = buf + len;
1150 struct cfg80211_internal_bss *bss;
1151
1152 spin_lock_bh(&dev->bss_lock);
1153 cfg80211_bss_expire(dev);
1154
1155 list_for_each_entry(bss, &dev->bss_list, list) {
1156 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
1157 spin_unlock_bh(&dev->bss_lock);
1158 return -E2BIG;
1159 }
1160 current_ev = ieee80211_bss(&dev->wiphy, info, bss,
1161 current_ev, end_buf);
1162 }
1163 spin_unlock_bh(&dev->bss_lock);
1164 return current_ev - buf;
1165}
1166
1167
1168int cfg80211_wext_giwscan(struct net_device *dev,
1169 struct iw_request_info *info,
1170 struct iw_point *data, char *extra)
1171{
1172 struct cfg80211_registered_device *rdev;
1173 int res;
1174
1175 if (!netif_running(dev))
1176 return -ENETDOWN;
1177
1178 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
1179
1180 if (IS_ERR(rdev))
1181 return PTR_ERR(rdev);
1182
1183 if (rdev->scan_req) {
1184 res = -EAGAIN;
1185 goto out;
1186 }
1187
1188 res = ieee80211_scan_results(rdev, info, extra, data->length);
1189 data->length = 0;
1190 if (res >= 0) {
1191 data->length = res;
1192 res = 0;
1193 }
1194
1195 out:
1196 cfg80211_unlock_rdev(rdev);
1197 return res;
1198}
1199EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan);
1200#endif