1 // SPDX-License-Identifier: GPL-2.0
3 * cfg80211 scan result handling
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
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>
20 #include <net/cfg80211.h>
21 #include <net/cfg80211-wext.h>
22 #include <net/iw_handler.h>
25 #include "wext-compat.h"
29 * DOC: BSS tree/list structure
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
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.
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.
54 * Note that the hidden_beacon_bss pointer never changes, due to
55 * the reference counting. Therefore, no locking is needed for
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.
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.)
72 static int bss_entries_limit
= 1000;
73 module_param(bss_entries_limit
, int, 0644);
74 MODULE_PARM_DESC(bss_entries_limit
,
75 "limit to number of scan BSS entries (per wiphy, default 1000)");
77 #define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ)
80 * struct cfg80211_colocated_ap - colocated AP information
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
100 struct cfg80211_colocated_ap
{
101 struct list_head list
;
103 u8 ssid
[IEEE80211_MAX_SSID_LEN
];
107 u8 unsolicited_probe
:1,
116 static void bss_free(struct cfg80211_internal_bss
*bss
)
118 struct cfg80211_bss_ies
*ies
;
120 if (WARN_ON(atomic_read(&bss
->hold
)))
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
);
128 kfree_rcu(ies
, rcu_head
);
131 * This happens when the module is removed, it doesn't
132 * really matter any more save for completeness
134 if (!list_empty(&bss
->hidden_list
))
135 list_del(&bss
->hidden_list
);
140 static inline void bss_ref_get(struct cfg80211_registered_device
*rdev
,
141 struct cfg80211_internal_bss
*bss
)
143 lockdep_assert_held(&rdev
->bss_lock
);
146 if (bss
->pub
.hidden_beacon_bss
) {
147 bss
= container_of(bss
->pub
.hidden_beacon_bss
,
148 struct cfg80211_internal_bss
,
152 if (bss
->pub
.transmitted_bss
) {
153 bss
= container_of(bss
->pub
.transmitted_bss
,
154 struct cfg80211_internal_bss
,
160 static inline void bss_ref_put(struct cfg80211_registered_device
*rdev
,
161 struct cfg80211_internal_bss
*bss
)
163 lockdep_assert_held(&rdev
->bss_lock
);
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
,
171 if (hbss
->refcount
== 0)
175 if (bss
->pub
.transmitted_bss
) {
176 struct cfg80211_internal_bss
*tbss
;
178 tbss
= container_of(bss
->pub
.transmitted_bss
,
179 struct cfg80211_internal_bss
,
182 if (tbss
->refcount
== 0)
187 if (bss
->refcount
== 0)
191 static bool __cfg80211_unlink_bss(struct cfg80211_registered_device
*rdev
,
192 struct cfg80211_internal_bss
*bss
)
194 lockdep_assert_held(&rdev
->bss_lock
);
196 if (!list_empty(&bss
->hidden_list
)) {
198 * don't remove the beacon entry if it has
199 * probe responses associated with it
201 if (!bss
->pub
.hidden_beacon_bss
)
204 * if it's a probe response entry break its
205 * link to the other entries in the group
207 list_del_init(&bss
->hidden_list
);
210 list_del_init(&bss
->list
);
211 list_del_init(&bss
->pub
.nontrans_list
);
212 rb_erase(&bss
->rbn
, &rdev
->bss_tree
);
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
);
221 bool cfg80211_is_element_inherited(const struct element
*elem
,
222 const struct element
*non_inherit_elem
)
224 u8 id_len
, ext_id_len
, i
, loop_len
, id
;
227 if (elem
->id
== WLAN_EID_MULTIPLE_BSSID
)
230 if (!non_inherit_elem
|| non_inherit_elem
->datalen
< 2)
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
240 id_len
= non_inherit_elem
->data
[1];
241 if (non_inherit_elem
->datalen
< 3 + id_len
)
244 ext_id_len
= non_inherit_elem
->data
[2 + id_len
];
245 if (non_inherit_elem
->datalen
< 3 + id_len
+ ext_id_len
)
248 if (elem
->id
== WLAN_EID_EXTENSION
) {
251 loop_len
= ext_id_len
;
252 list
= &non_inherit_elem
->data
[3 + id_len
];
258 list
= &non_inherit_elem
->data
[2];
262 for (i
= 0; i
< loop_len
; i
++) {
269 EXPORT_SYMBOL(cfg80211_is_element_inherited
);
271 static size_t cfg80211_gen_new_ie(const u8
*ie
, size_t ielen
,
272 const u8
*subelement
, size_t subie_len
,
273 u8
*new_ie
, gfp_t gfp
)
276 const u8
*tmp_old
, *tmp_new
;
277 const struct element
*non_inherit_elem
;
280 /* copy subelement as we need to change its content to
281 * mark an ie after it is processed.
283 sub_copy
= kmemdup(subelement
, subie_len
, gfp
);
290 tmp_new
= cfg80211_find_ie(WLAN_EID_SSID
, sub_copy
, subie_len
);
292 memcpy(pos
, tmp_new
, tmp_new
[1] + 2);
293 pos
+= (tmp_new
[1] + 2);
296 /* get non inheritance list if exists */
298 cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE
,
299 sub_copy
, subie_len
);
301 /* go through IEs in ie (skip SSID) and subelement,
302 * merge them into new_ie
304 tmp_old
= cfg80211_find_ie(WLAN_EID_SSID
, ie
, ielen
);
305 tmp_old
= (tmp_old
) ? tmp_old
+ tmp_old
[1] + 2 : ie
;
307 while (tmp_old
+ tmp_old
[1] + 2 - ie
<= ielen
) {
308 if (tmp_old
[0] == 0) {
313 if (tmp_old
[0] == WLAN_EID_EXTENSION
)
314 tmp
= (u8
*)cfg80211_find_ext_ie(tmp_old
[2], sub_copy
,
317 tmp
= (u8
*)cfg80211_find_ie(tmp_old
[0], sub_copy
,
321 const struct element
*old_elem
= (void *)tmp_old
;
323 /* ie in old ie but not in subelement */
324 if (cfg80211_is_element_inherited(old_elem
,
326 memcpy(pos
, tmp_old
, tmp_old
[1] + 2);
327 pos
+= tmp_old
[1] + 2;
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.
337 if (tmp_old
[0] == WLAN_EID_VENDOR_SPECIFIC
) {
338 if (!memcmp(tmp_old
+ 2, tmp
+ 2, 5)) {
339 /* same vendor ie, copy from
342 memcpy(pos
, tmp
, tmp
[1] + 2);
344 tmp
[0] = WLAN_EID_SSID
;
346 memcpy(pos
, tmp_old
, tmp_old
[1] + 2);
347 pos
+= tmp_old
[1] + 2;
350 /* copy ie from subelement into new ie */
351 memcpy(pos
, tmp
, tmp
[1] + 2);
353 tmp
[0] = WLAN_EID_SSID
;
357 if (tmp_old
+ tmp_old
[1] + 2 - ie
== ielen
)
360 tmp_old
+= tmp_old
[1] + 2;
363 /* go through subelement again to check if there is any ie not
364 * copied to new ie, skip ssid, capability, bssid-index ie
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;
373 if (tmp_new
+ tmp_new
[1] + 2 - sub_copy
== subie_len
)
375 tmp_new
+= tmp_new
[1] + 2;
382 static bool is_bss(struct cfg80211_bss
*a
, const u8
*bssid
,
383 const u8
*ssid
, size_t ssid_len
)
385 const struct cfg80211_bss_ies
*ies
;
388 if (bssid
&& !ether_addr_equal(a
->bssid
, bssid
))
394 ies
= rcu_access_pointer(a
->ies
);
397 ssidie
= cfg80211_find_ie(WLAN_EID_SSID
, ies
->data
, ies
->len
);
400 if (ssidie
[1] != ssid_len
)
402 return memcmp(ssidie
+ 2, ssid
, ssid_len
) == 0;
406 cfg80211_add_nontrans_list(struct cfg80211_bss
*trans_bss
,
407 struct cfg80211_bss
*nontrans_bss
)
411 struct cfg80211_bss
*bss
= NULL
;
414 ssid
= ieee80211_bss_get_ie(nontrans_bss
, WLAN_EID_SSID
);
422 /* check if nontrans_bss is in the list */
423 list_for_each_entry(bss
, &trans_bss
->nontrans_list
, nontrans_list
) {
424 if (is_bss(bss
, nontrans_bss
->bssid
, ssid
, ssid_len
)) {
432 /* add to the list */
433 list_add_tail(&nontrans_bss
->nontrans_list
, &trans_bss
->nontrans_list
);
437 static void __cfg80211_bss_expire(struct cfg80211_registered_device
*rdev
,
438 unsigned long expire_time
)
440 struct cfg80211_internal_bss
*bss
, *tmp
;
441 bool expired
= false;
443 lockdep_assert_held(&rdev
->bss_lock
);
445 list_for_each_entry_safe(bss
, tmp
, &rdev
->bss_list
, list
) {
446 if (atomic_read(&bss
->hold
))
448 if (!time_after(expire_time
, bss
->ts
))
451 if (__cfg80211_unlink_bss(rdev
, bss
))
456 rdev
->bss_generation
++;
459 static bool cfg80211_bss_expire_oldest(struct cfg80211_registered_device
*rdev
)
461 struct cfg80211_internal_bss
*bss
, *oldest
= NULL
;
464 lockdep_assert_held(&rdev
->bss_lock
);
466 list_for_each_entry(bss
, &rdev
->bss_list
, list
) {
467 if (atomic_read(&bss
->hold
))
470 if (!list_empty(&bss
->hidden_list
) &&
471 !bss
->pub
.hidden_beacon_bss
)
474 if (oldest
&& time_before(oldest
->ts
, bss
->ts
))
479 if (WARN_ON(!oldest
))
483 * The callers make sure to increase rdev->bss_generation if anything
484 * gets removed (and a new entry added), so there's no need to also do
488 ret
= __cfg80211_unlink_bss(rdev
, oldest
);
493 static u8
cfg80211_parse_bss_param(u8 data
,
494 struct cfg80211_colocated_ap
*coloc_ap
)
496 coloc_ap
->oct_recommended
=
497 u8_get_bits(data
, IEEE80211_RNR_TBTT_PARAMS_OCT_RECOMMENDED
);
498 coloc_ap
->same_ssid
=
499 u8_get_bits(data
, IEEE80211_RNR_TBTT_PARAMS_SAME_SSID
);
500 coloc_ap
->multi_bss
=
501 u8_get_bits(data
, IEEE80211_RNR_TBTT_PARAMS_MULTI_BSSID
);
502 coloc_ap
->transmitted_bssid
=
503 u8_get_bits(data
, IEEE80211_RNR_TBTT_PARAMS_TRANSMITTED_BSSID
);
504 coloc_ap
->unsolicited_probe
=
505 u8_get_bits(data
, IEEE80211_RNR_TBTT_PARAMS_PROBE_ACTIVE
);
506 coloc_ap
->colocated_ess
=
507 u8_get_bits(data
, IEEE80211_RNR_TBTT_PARAMS_COLOC_ESS
);
509 return u8_get_bits(data
, IEEE80211_RNR_TBTT_PARAMS_COLOC_AP
);
512 static int cfg80211_calc_short_ssid(const struct cfg80211_bss_ies
*ies
,
513 const struct element
**elem
, u32
*s_ssid
)
516 *elem
= cfg80211_find_elem(WLAN_EID_SSID
, ies
->data
, ies
->len
);
517 if (!*elem
|| (*elem
)->datalen
> IEEE80211_MAX_SSID_LEN
)
520 *s_ssid
= ~crc32_le(~0, (*elem
)->data
, (*elem
)->datalen
);
524 static void cfg80211_free_coloc_ap_list(struct list_head
*coloc_ap_list
)
526 struct cfg80211_colocated_ap
*ap
, *tmp_ap
;
528 list_for_each_entry_safe(ap
, tmp_ap
, coloc_ap_list
, list
) {
534 static int cfg80211_parse_ap_info(struct cfg80211_colocated_ap
*entry
,
535 const u8
*pos
, u8 length
,
536 const struct element
*ssid_elem
,
539 /* skip the TBTT offset */
542 memcpy(entry
->bssid
, pos
, ETH_ALEN
);
545 if (length
== IEEE80211_TBTT_INFO_OFFSET_BSSID_SSSID_BSS_PARAM
) {
546 memcpy(&entry
->short_ssid
, pos
,
547 sizeof(entry
->short_ssid
));
548 entry
->short_ssid_valid
= true;
552 /* skip non colocated APs */
553 if (!cfg80211_parse_bss_param(*pos
, entry
))
557 if (length
== IEEE80211_TBTT_INFO_OFFSET_BSSID_BSS_PARAM
) {
559 * no information about the short ssid. Consider the entry valid
560 * for now. It would later be dropped in case there are explicit
561 * SSIDs that need to be matched
563 if (!entry
->same_ssid
)
567 if (entry
->same_ssid
) {
568 entry
->short_ssid
= s_ssid_tmp
;
569 entry
->short_ssid_valid
= true;
572 * This is safe because we validate datalen in
573 * cfg80211_parse_colocated_ap(), before calling this
576 memcpy(&entry
->ssid
, &ssid_elem
->data
,
578 entry
->ssid_len
= ssid_elem
->datalen
;
583 static int cfg80211_parse_colocated_ap(const struct cfg80211_bss_ies
*ies
,
584 struct list_head
*list
)
586 struct ieee80211_neighbor_ap_info
*ap_info
;
587 const struct element
*elem
, *ssid_elem
;
590 int n_coloc
= 0, ret
;
593 elem
= cfg80211_find_elem(WLAN_EID_REDUCED_NEIGHBOR_REPORT
, ies
->data
,
599 end
= pos
+ elem
->datalen
;
601 ret
= cfg80211_calc_short_ssid(ies
, &ssid_elem
, &s_ssid_tmp
);
605 /* RNR IE may contain more than one NEIGHBOR_AP_INFO */
606 while (pos
+ sizeof(*ap_info
) <= end
) {
607 enum nl80211_band band
;
611 ap_info
= (void *)pos
;
612 count
= u8_get_bits(ap_info
->tbtt_info_hdr
,
613 IEEE80211_AP_INFO_TBTT_HDR_COUNT
) + 1;
614 length
= ap_info
->tbtt_info_len
;
616 pos
+= sizeof(*ap_info
);
618 if (!ieee80211_operating_class_to_band(ap_info
->op_class
,
622 freq
= ieee80211_channel_to_frequency(ap_info
->channel
, band
);
624 if (end
- pos
< count
* length
)
628 * TBTT info must include bss param + BSSID +
629 * (short SSID or same_ssid bit to be set).
630 * ignore other options, and move to the
633 if (band
!= NL80211_BAND_6GHZ
||
634 (length
!= IEEE80211_TBTT_INFO_OFFSET_BSSID_BSS_PARAM
&&
635 length
< IEEE80211_TBTT_INFO_OFFSET_BSSID_SSSID_BSS_PARAM
)) {
636 pos
+= count
* length
;
640 for (i
= 0; i
< count
; i
++) {
641 struct cfg80211_colocated_ap
*entry
;
643 entry
= kzalloc(sizeof(*entry
) + IEEE80211_MAX_SSID_LEN
,
649 entry
->center_freq
= freq
;
651 if (!cfg80211_parse_ap_info(entry
, pos
, length
,
652 ssid_elem
, s_ssid_tmp
)) {
654 list_add_tail(&entry
->list
, &ap_list
);
664 cfg80211_free_coloc_ap_list(&ap_list
);
668 list_splice_tail(&ap_list
, list
);
672 static void cfg80211_scan_req_add_chan(struct cfg80211_scan_request
*request
,
673 struct ieee80211_channel
*chan
,
677 u32 n_channels
= request
->n_channels
;
678 struct cfg80211_scan_6ghz_params
*params
=
679 &request
->scan_6ghz_params
[request
->n_6ghz_params
];
681 for (i
= 0; i
< n_channels
; i
++) {
682 if (request
->channels
[i
] == chan
) {
684 params
->channel_idx
= i
;
689 request
->channels
[n_channels
] = chan
;
691 request
->scan_6ghz_params
[request
->n_6ghz_params
].channel_idx
=
694 request
->n_channels
++;
697 static bool cfg80211_find_ssid_match(struct cfg80211_colocated_ap
*ap
,
698 struct cfg80211_scan_request
*request
)
703 for (i
= 0; i
< request
->n_ssids
; i
++) {
704 /* wildcard ssid in the scan request */
705 if (!request
->ssids
[i
].ssid_len
) {
706 if (ap
->multi_bss
&& !ap
->transmitted_bssid
)
713 ap
->ssid_len
== request
->ssids
[i
].ssid_len
) {
714 if (!memcmp(request
->ssids
[i
].ssid
, ap
->ssid
,
717 } else if (ap
->short_ssid_valid
) {
718 s_ssid
= ~crc32_le(~0, request
->ssids
[i
].ssid
,
719 request
->ssids
[i
].ssid_len
);
721 if (ap
->short_ssid
== s_ssid
)
729 static int cfg80211_scan_6ghz(struct cfg80211_registered_device
*rdev
)
732 struct cfg80211_colocated_ap
*ap
;
733 int n_channels
, count
= 0, err
;
734 struct cfg80211_scan_request
*request
, *rdev_req
= rdev
->scan_req
;
735 LIST_HEAD(coloc_ap_list
);
736 bool need_scan_psc
= true;
737 const struct ieee80211_sband_iftype_data
*iftd
;
739 rdev_req
->scan_6ghz
= true;
741 if (!rdev
->wiphy
.bands
[NL80211_BAND_6GHZ
])
744 iftd
= ieee80211_get_sband_iftype_data(rdev
->wiphy
.bands
[NL80211_BAND_6GHZ
],
745 rdev_req
->wdev
->iftype
);
746 if (!iftd
|| !iftd
->he_cap
.has_he
)
749 n_channels
= rdev
->wiphy
.bands
[NL80211_BAND_6GHZ
]->n_channels
;
751 if (rdev_req
->flags
& NL80211_SCAN_FLAG_COLOCATED_6GHZ
) {
752 struct cfg80211_internal_bss
*intbss
;
754 spin_lock_bh(&rdev
->bss_lock
);
755 list_for_each_entry(intbss
, &rdev
->bss_list
, list
) {
756 struct cfg80211_bss
*res
= &intbss
->pub
;
757 const struct cfg80211_bss_ies
*ies
;
759 ies
= rcu_access_pointer(res
->ies
);
760 count
+= cfg80211_parse_colocated_ap(ies
,
763 spin_unlock_bh(&rdev
->bss_lock
);
766 request
= kzalloc(struct_size(request
, channels
, n_channels
) +
767 sizeof(*request
->scan_6ghz_params
) * count
+
768 sizeof(*request
->ssids
) * rdev_req
->n_ssids
,
771 cfg80211_free_coloc_ap_list(&coloc_ap_list
);
775 *request
= *rdev_req
;
776 request
->n_channels
= 0;
777 request
->scan_6ghz_params
=
778 (void *)&request
->channels
[n_channels
];
781 * PSC channels should not be scanned in case of direct scan with 1 SSID
782 * and at least one of the reported co-located APs with same SSID
783 * indicating that all APs in the same ESS are co-located
785 if (count
&& request
->n_ssids
== 1 && request
->ssids
[0].ssid_len
) {
786 list_for_each_entry(ap
, &coloc_ap_list
, list
) {
787 if (ap
->colocated_ess
&&
788 cfg80211_find_ssid_match(ap
, request
)) {
789 need_scan_psc
= false;
796 * add to the scan request the channels that need to be scanned
797 * regardless of the collocated APs (PSC channels or all channels
798 * in case that NL80211_SCAN_FLAG_COLOCATED_6GHZ is not set)
800 for (i
= 0; i
< rdev_req
->n_channels
; i
++) {
801 if (rdev_req
->channels
[i
]->band
== NL80211_BAND_6GHZ
&&
803 cfg80211_channel_is_psc(rdev_req
->channels
[i
])) ||
804 !(rdev_req
->flags
& NL80211_SCAN_FLAG_COLOCATED_6GHZ
))) {
805 cfg80211_scan_req_add_chan(request
,
806 rdev_req
->channels
[i
],
811 if (!(rdev_req
->flags
& NL80211_SCAN_FLAG_COLOCATED_6GHZ
))
814 list_for_each_entry(ap
, &coloc_ap_list
, list
) {
816 struct cfg80211_scan_6ghz_params
*scan_6ghz_params
=
817 &request
->scan_6ghz_params
[request
->n_6ghz_params
];
818 struct ieee80211_channel
*chan
=
819 ieee80211_get_channel(&rdev
->wiphy
, ap
->center_freq
);
821 if (!chan
|| chan
->flags
& IEEE80211_CHAN_DISABLED
)
824 for (i
= 0; i
< rdev_req
->n_channels
; i
++) {
825 if (rdev_req
->channels
[i
] == chan
)
832 if (request
->n_ssids
> 0 &&
833 !cfg80211_find_ssid_match(ap
, request
))
836 if (!request
->n_ssids
&& ap
->multi_bss
&& !ap
->transmitted_bssid
)
839 cfg80211_scan_req_add_chan(request
, chan
, true);
840 memcpy(scan_6ghz_params
->bssid
, ap
->bssid
, ETH_ALEN
);
841 scan_6ghz_params
->short_ssid
= ap
->short_ssid
;
842 scan_6ghz_params
->short_ssid_valid
= ap
->short_ssid_valid
;
843 scan_6ghz_params
->unsolicited_probe
= ap
->unsolicited_probe
;
846 * If a PSC channel is added to the scan and 'need_scan_psc' is
847 * set to false, then all the APs that the scan logic is
848 * interested with on the channel are collocated and thus there
849 * is no need to perform the initial PSC channel listen.
851 if (cfg80211_channel_is_psc(chan
) && !need_scan_psc
)
852 scan_6ghz_params
->psc_no_listen
= true;
854 request
->n_6ghz_params
++;
858 cfg80211_free_coloc_ap_list(&coloc_ap_list
);
860 if (request
->n_channels
) {
861 struct cfg80211_scan_request
*old
= rdev
->int_scan_req
;
862 rdev
->int_scan_req
= request
;
865 * Add the ssids from the parent scan request to the new scan
866 * request, so the driver would be able to use them in its
867 * probe requests to discover hidden APs on PSC channels.
869 request
->ssids
= (void *)&request
->channels
[request
->n_channels
];
870 request
->n_ssids
= rdev_req
->n_ssids
;
871 memcpy(request
->ssids
, rdev_req
->ssids
, sizeof(*request
->ssids
) *
875 * If this scan follows a previous scan, save the scan start
876 * info from the first part of the scan
879 rdev
->int_scan_req
->info
= old
->info
;
881 err
= rdev_scan(rdev
, request
);
883 rdev
->int_scan_req
= old
;
896 int cfg80211_scan(struct cfg80211_registered_device
*rdev
)
898 struct cfg80211_scan_request
*request
;
899 struct cfg80211_scan_request
*rdev_req
= rdev
->scan_req
;
900 u32 n_channels
= 0, idx
, i
;
902 if (!(rdev
->wiphy
.flags
& WIPHY_FLAG_SPLIT_SCAN_6GHZ
))
903 return rdev_scan(rdev
, rdev_req
);
905 for (i
= 0; i
< rdev_req
->n_channels
; i
++) {
906 if (rdev_req
->channels
[i
]->band
!= NL80211_BAND_6GHZ
)
911 return cfg80211_scan_6ghz(rdev
);
913 request
= kzalloc(struct_size(request
, channels
, n_channels
),
918 *request
= *rdev_req
;
919 request
->n_channels
= n_channels
;
921 for (i
= idx
= 0; i
< rdev_req
->n_channels
; i
++) {
922 if (rdev_req
->channels
[i
]->band
!= NL80211_BAND_6GHZ
)
923 request
->channels
[idx
++] = rdev_req
->channels
[i
];
926 rdev_req
->scan_6ghz
= false;
927 rdev
->int_scan_req
= request
;
928 return rdev_scan(rdev
, request
);
931 void ___cfg80211_scan_done(struct cfg80211_registered_device
*rdev
,
934 struct cfg80211_scan_request
*request
, *rdev_req
;
935 struct wireless_dev
*wdev
;
937 #ifdef CONFIG_CFG80211_WEXT
938 union iwreq_data wrqu
;
941 lockdep_assert_held(&rdev
->wiphy
.mtx
);
943 if (rdev
->scan_msg
) {
944 nl80211_send_scan_msg(rdev
, rdev
->scan_msg
);
945 rdev
->scan_msg
= NULL
;
949 rdev_req
= rdev
->scan_req
;
953 wdev
= rdev_req
->wdev
;
954 request
= rdev
->int_scan_req
? rdev
->int_scan_req
: rdev_req
;
956 if (wdev_running(wdev
) &&
957 (rdev
->wiphy
.flags
& WIPHY_FLAG_SPLIT_SCAN_6GHZ
) &&
958 !rdev_req
->scan_6ghz
&& !request
->info
.aborted
&&
959 !cfg80211_scan_6ghz(rdev
))
963 * This must be before sending the other events!
964 * Otherwise, wpa_supplicant gets completely confused with
968 cfg80211_sme_scan_done(wdev
->netdev
);
970 if (!request
->info
.aborted
&&
971 request
->flags
& NL80211_SCAN_FLAG_FLUSH
) {
972 /* flush entries from previous scans */
973 spin_lock_bh(&rdev
->bss_lock
);
974 __cfg80211_bss_expire(rdev
, request
->scan_start
);
975 spin_unlock_bh(&rdev
->bss_lock
);
978 msg
= nl80211_build_scan_msg(rdev
, wdev
, request
->info
.aborted
);
980 #ifdef CONFIG_CFG80211_WEXT
981 if (wdev
->netdev
&& !request
->info
.aborted
) {
982 memset(&wrqu
, 0, sizeof(wrqu
));
984 wireless_send_event(wdev
->netdev
, SIOCGIWSCAN
, &wrqu
, NULL
);
988 dev_put(wdev
->netdev
);
990 kfree(rdev
->int_scan_req
);
991 rdev
->int_scan_req
= NULL
;
993 kfree(rdev
->scan_req
);
994 rdev
->scan_req
= NULL
;
997 rdev
->scan_msg
= msg
;
999 nl80211_send_scan_msg(rdev
, msg
);
1002 void __cfg80211_scan_done(struct work_struct
*wk
)
1004 struct cfg80211_registered_device
*rdev
;
1006 rdev
= container_of(wk
, struct cfg80211_registered_device
,
1009 wiphy_lock(&rdev
->wiphy
);
1010 ___cfg80211_scan_done(rdev
, true);
1011 wiphy_unlock(&rdev
->wiphy
);
1014 void cfg80211_scan_done(struct cfg80211_scan_request
*request
,
1015 struct cfg80211_scan_info
*info
)
1017 struct cfg80211_scan_info old_info
= request
->info
;
1019 trace_cfg80211_scan_done(request
, info
);
1020 WARN_ON(request
!= wiphy_to_rdev(request
->wiphy
)->scan_req
&&
1021 request
!= wiphy_to_rdev(request
->wiphy
)->int_scan_req
);
1023 request
->info
= *info
;
1026 * In case the scan is split, the scan_start_tsf and tsf_bssid should
1027 * be of the first part. In such a case old_info.scan_start_tsf should
1030 if (request
->scan_6ghz
&& old_info
.scan_start_tsf
) {
1031 request
->info
.scan_start_tsf
= old_info
.scan_start_tsf
;
1032 memcpy(request
->info
.tsf_bssid
, old_info
.tsf_bssid
,
1033 sizeof(request
->info
.tsf_bssid
));
1036 request
->notified
= true;
1037 queue_work(cfg80211_wq
, &wiphy_to_rdev(request
->wiphy
)->scan_done_wk
);
1039 EXPORT_SYMBOL(cfg80211_scan_done
);
1041 void cfg80211_add_sched_scan_req(struct cfg80211_registered_device
*rdev
,
1042 struct cfg80211_sched_scan_request
*req
)
1044 lockdep_assert_held(&rdev
->wiphy
.mtx
);
1046 list_add_rcu(&req
->list
, &rdev
->sched_scan_req_list
);
1049 static void cfg80211_del_sched_scan_req(struct cfg80211_registered_device
*rdev
,
1050 struct cfg80211_sched_scan_request
*req
)
1052 lockdep_assert_held(&rdev
->wiphy
.mtx
);
1054 list_del_rcu(&req
->list
);
1055 kfree_rcu(req
, rcu_head
);
1058 static struct cfg80211_sched_scan_request
*
1059 cfg80211_find_sched_scan_req(struct cfg80211_registered_device
*rdev
, u64 reqid
)
1061 struct cfg80211_sched_scan_request
*pos
;
1063 list_for_each_entry_rcu(pos
, &rdev
->sched_scan_req_list
, list
,
1064 lockdep_is_held(&rdev
->wiphy
.mtx
)) {
1065 if (pos
->reqid
== reqid
)
1072 * Determines if a scheduled scan request can be handled. When a legacy
1073 * scheduled scan is running no other scheduled scan is allowed regardless
1074 * whether the request is for legacy or multi-support scan. When a multi-support
1075 * scheduled scan is running a request for legacy scan is not allowed. In this
1076 * case a request for multi-support scan can be handled if resources are
1077 * available, ie. struct wiphy::max_sched_scan_reqs limit is not yet reached.
1079 int cfg80211_sched_scan_req_possible(struct cfg80211_registered_device
*rdev
,
1082 struct cfg80211_sched_scan_request
*pos
;
1085 list_for_each_entry(pos
, &rdev
->sched_scan_req_list
, list
) {
1086 /* request id zero means legacy in progress */
1087 if (!i
&& !pos
->reqid
)
1088 return -EINPROGRESS
;
1093 /* no legacy allowed when multi request(s) are active */
1095 return -EINPROGRESS
;
1097 /* resource limit reached */
1098 if (i
== rdev
->wiphy
.max_sched_scan_reqs
)
1104 void cfg80211_sched_scan_results_wk(struct work_struct
*work
)
1106 struct cfg80211_registered_device
*rdev
;
1107 struct cfg80211_sched_scan_request
*req
, *tmp
;
1109 rdev
= container_of(work
, struct cfg80211_registered_device
,
1112 wiphy_lock(&rdev
->wiphy
);
1113 list_for_each_entry_safe(req
, tmp
, &rdev
->sched_scan_req_list
, list
) {
1114 if (req
->report_results
) {
1115 req
->report_results
= false;
1116 if (req
->flags
& NL80211_SCAN_FLAG_FLUSH
) {
1117 /* flush entries from previous scans */
1118 spin_lock_bh(&rdev
->bss_lock
);
1119 __cfg80211_bss_expire(rdev
, req
->scan_start
);
1120 spin_unlock_bh(&rdev
->bss_lock
);
1121 req
->scan_start
= jiffies
;
1123 nl80211_send_sched_scan(req
,
1124 NL80211_CMD_SCHED_SCAN_RESULTS
);
1127 wiphy_unlock(&rdev
->wiphy
);
1130 void cfg80211_sched_scan_results(struct wiphy
*wiphy
, u64 reqid
)
1132 struct cfg80211_registered_device
*rdev
= wiphy_to_rdev(wiphy
);
1133 struct cfg80211_sched_scan_request
*request
;
1135 trace_cfg80211_sched_scan_results(wiphy
, reqid
);
1136 /* ignore if we're not scanning */
1139 request
= cfg80211_find_sched_scan_req(rdev
, reqid
);
1141 request
->report_results
= true;
1142 queue_work(cfg80211_wq
, &rdev
->sched_scan_res_wk
);
1146 EXPORT_SYMBOL(cfg80211_sched_scan_results
);
1148 void cfg80211_sched_scan_stopped_locked(struct wiphy
*wiphy
, u64 reqid
)
1150 struct cfg80211_registered_device
*rdev
= wiphy_to_rdev(wiphy
);
1152 lockdep_assert_held(&wiphy
->mtx
);
1154 trace_cfg80211_sched_scan_stopped(wiphy
, reqid
);
1156 __cfg80211_stop_sched_scan(rdev
, reqid
, true);
1158 EXPORT_SYMBOL(cfg80211_sched_scan_stopped_locked
);
1160 void cfg80211_sched_scan_stopped(struct wiphy
*wiphy
, u64 reqid
)
1163 cfg80211_sched_scan_stopped_locked(wiphy
, reqid
);
1164 wiphy_unlock(wiphy
);
1166 EXPORT_SYMBOL(cfg80211_sched_scan_stopped
);
1168 int cfg80211_stop_sched_scan_req(struct cfg80211_registered_device
*rdev
,
1169 struct cfg80211_sched_scan_request
*req
,
1170 bool driver_initiated
)
1172 lockdep_assert_held(&rdev
->wiphy
.mtx
);
1174 if (!driver_initiated
) {
1175 int err
= rdev_sched_scan_stop(rdev
, req
->dev
, req
->reqid
);
1180 nl80211_send_sched_scan(req
, NL80211_CMD_SCHED_SCAN_STOPPED
);
1182 cfg80211_del_sched_scan_req(rdev
, req
);
1187 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device
*rdev
,
1188 u64 reqid
, bool driver_initiated
)
1190 struct cfg80211_sched_scan_request
*sched_scan_req
;
1192 lockdep_assert_held(&rdev
->wiphy
.mtx
);
1194 sched_scan_req
= cfg80211_find_sched_scan_req(rdev
, reqid
);
1195 if (!sched_scan_req
)
1198 return cfg80211_stop_sched_scan_req(rdev
, sched_scan_req
,
1202 void cfg80211_bss_age(struct cfg80211_registered_device
*rdev
,
1203 unsigned long age_secs
)
1205 struct cfg80211_internal_bss
*bss
;
1206 unsigned long age_jiffies
= msecs_to_jiffies(age_secs
* MSEC_PER_SEC
);
1208 spin_lock_bh(&rdev
->bss_lock
);
1209 list_for_each_entry(bss
, &rdev
->bss_list
, list
)
1210 bss
->ts
-= age_jiffies
;
1211 spin_unlock_bh(&rdev
->bss_lock
);
1214 void cfg80211_bss_expire(struct cfg80211_registered_device
*rdev
)
1216 __cfg80211_bss_expire(rdev
, jiffies
- IEEE80211_SCAN_RESULT_EXPIRE
);
1219 void cfg80211_bss_flush(struct wiphy
*wiphy
)
1221 struct cfg80211_registered_device
*rdev
= wiphy_to_rdev(wiphy
);
1223 spin_lock_bh(&rdev
->bss_lock
);
1224 __cfg80211_bss_expire(rdev
, jiffies
);
1225 spin_unlock_bh(&rdev
->bss_lock
);
1227 EXPORT_SYMBOL(cfg80211_bss_flush
);
1229 const struct element
*
1230 cfg80211_find_elem_match(u8 eid
, const u8
*ies
, unsigned int len
,
1231 const u8
*match
, unsigned int match_len
,
1232 unsigned int match_offset
)
1234 const struct element
*elem
;
1236 for_each_element_id(elem
, eid
, ies
, len
) {
1237 if (elem
->datalen
>= match_offset
+ match_len
&&
1238 !memcmp(elem
->data
+ match_offset
, match
, match_len
))
1244 EXPORT_SYMBOL(cfg80211_find_elem_match
);
1246 const struct element
*cfg80211_find_vendor_elem(unsigned int oui
, int oui_type
,
1250 const struct element
*elem
;
1251 u8 match
[] = { oui
>> 16, oui
>> 8, oui
, oui_type
};
1252 int match_len
= (oui_type
< 0) ? 3 : sizeof(match
);
1254 if (WARN_ON(oui_type
> 0xff))
1257 elem
= cfg80211_find_elem_match(WLAN_EID_VENDOR_SPECIFIC
, ies
, len
,
1258 match
, match_len
, 0);
1260 if (!elem
|| elem
->datalen
< 4)
1265 EXPORT_SYMBOL(cfg80211_find_vendor_elem
);
1268 * enum bss_compare_mode - BSS compare mode
1269 * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find)
1270 * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode
1271 * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode
1273 enum bss_compare_mode
{
1279 static int cmp_bss(struct cfg80211_bss
*a
,
1280 struct cfg80211_bss
*b
,
1281 enum bss_compare_mode mode
)
1283 const struct cfg80211_bss_ies
*a_ies
, *b_ies
;
1284 const u8
*ie1
= NULL
;
1285 const u8
*ie2
= NULL
;
1288 if (a
->channel
!= b
->channel
)
1289 return b
->channel
->center_freq
- a
->channel
->center_freq
;
1291 a_ies
= rcu_access_pointer(a
->ies
);
1294 b_ies
= rcu_access_pointer(b
->ies
);
1298 if (WLAN_CAPABILITY_IS_STA_BSS(a
->capability
))
1299 ie1
= cfg80211_find_ie(WLAN_EID_MESH_ID
,
1300 a_ies
->data
, a_ies
->len
);
1301 if (WLAN_CAPABILITY_IS_STA_BSS(b
->capability
))
1302 ie2
= cfg80211_find_ie(WLAN_EID_MESH_ID
,
1303 b_ies
->data
, b_ies
->len
);
1307 if (ie1
[1] == ie2
[1])
1308 mesh_id_cmp
= memcmp(ie1
+ 2, ie2
+ 2, ie1
[1]);
1310 mesh_id_cmp
= ie2
[1] - ie1
[1];
1312 ie1
= cfg80211_find_ie(WLAN_EID_MESH_CONFIG
,
1313 a_ies
->data
, a_ies
->len
);
1314 ie2
= cfg80211_find_ie(WLAN_EID_MESH_CONFIG
,
1315 b_ies
->data
, b_ies
->len
);
1319 if (ie1
[1] != ie2
[1])
1320 return ie2
[1] - ie1
[1];
1321 return memcmp(ie1
+ 2, ie2
+ 2, ie1
[1]);
1325 r
= memcmp(a
->bssid
, b
->bssid
, sizeof(a
->bssid
));
1329 ie1
= cfg80211_find_ie(WLAN_EID_SSID
, a_ies
->data
, a_ies
->len
);
1330 ie2
= cfg80211_find_ie(WLAN_EID_SSID
, b_ies
->data
, b_ies
->len
);
1336 * Note that with "hide_ssid", the function returns a match if
1337 * the already-present BSS ("b") is a hidden SSID beacon for
1338 * the new BSS ("a").
1341 /* sort missing IE before (left of) present IE */
1348 case BSS_CMP_HIDE_ZLEN
:
1350 * In ZLEN mode we assume the BSS entry we're
1351 * looking for has a zero-length SSID. So if
1352 * the one we're looking at right now has that,
1353 * return 0. Otherwise, return the difference
1354 * in length, but since we're looking for the
1355 * 0-length it's really equivalent to returning
1356 * the length of the one we're looking at.
1358 * No content comparison is needed as we assume
1359 * the content length is zero.
1362 case BSS_CMP_REGULAR
:
1364 /* sort by length first, then by contents */
1365 if (ie1
[1] != ie2
[1])
1366 return ie2
[1] - ie1
[1];
1367 return memcmp(ie1
+ 2, ie2
+ 2, ie1
[1]);
1368 case BSS_CMP_HIDE_NUL
:
1369 if (ie1
[1] != ie2
[1])
1370 return ie2
[1] - ie1
[1];
1371 /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */
1372 for (i
= 0; i
< ie2
[1]; i
++)
1379 static bool cfg80211_bss_type_match(u16 capability
,
1380 enum nl80211_band band
,
1381 enum ieee80211_bss_type bss_type
)
1386 if (bss_type
== IEEE80211_BSS_TYPE_ANY
)
1389 if (band
== NL80211_BAND_60GHZ
) {
1390 mask
= WLAN_CAPABILITY_DMG_TYPE_MASK
;
1392 case IEEE80211_BSS_TYPE_ESS
:
1393 val
= WLAN_CAPABILITY_DMG_TYPE_AP
;
1395 case IEEE80211_BSS_TYPE_PBSS
:
1396 val
= WLAN_CAPABILITY_DMG_TYPE_PBSS
;
1398 case IEEE80211_BSS_TYPE_IBSS
:
1399 val
= WLAN_CAPABILITY_DMG_TYPE_IBSS
;
1405 mask
= WLAN_CAPABILITY_ESS
| WLAN_CAPABILITY_IBSS
;
1407 case IEEE80211_BSS_TYPE_ESS
:
1408 val
= WLAN_CAPABILITY_ESS
;
1410 case IEEE80211_BSS_TYPE_IBSS
:
1411 val
= WLAN_CAPABILITY_IBSS
;
1413 case IEEE80211_BSS_TYPE_MBSS
:
1421 ret
= ((capability
& mask
) == val
);
1425 /* Returned bss is reference counted and must be cleaned up appropriately. */
1426 struct cfg80211_bss
*cfg80211_get_bss(struct wiphy
*wiphy
,
1427 struct ieee80211_channel
*channel
,
1429 const u8
*ssid
, size_t ssid_len
,
1430 enum ieee80211_bss_type bss_type
,
1431 enum ieee80211_privacy privacy
)
1433 struct cfg80211_registered_device
*rdev
= wiphy_to_rdev(wiphy
);
1434 struct cfg80211_internal_bss
*bss
, *res
= NULL
;
1435 unsigned long now
= jiffies
;
1438 trace_cfg80211_get_bss(wiphy
, channel
, bssid
, ssid
, ssid_len
, bss_type
,
1441 spin_lock_bh(&rdev
->bss_lock
);
1443 list_for_each_entry(bss
, &rdev
->bss_list
, list
) {
1444 if (!cfg80211_bss_type_match(bss
->pub
.capability
,
1445 bss
->pub
.channel
->band
, bss_type
))
1448 bss_privacy
= (bss
->pub
.capability
& WLAN_CAPABILITY_PRIVACY
);
1449 if ((privacy
== IEEE80211_PRIVACY_ON
&& !bss_privacy
) ||
1450 (privacy
== IEEE80211_PRIVACY_OFF
&& bss_privacy
))
1452 if (channel
&& bss
->pub
.channel
!= channel
)
1454 if (!is_valid_ether_addr(bss
->pub
.bssid
))
1456 /* Don't get expired BSS structs */
1457 if (time_after(now
, bss
->ts
+ IEEE80211_SCAN_RESULT_EXPIRE
) &&
1458 !atomic_read(&bss
->hold
))
1460 if (is_bss(&bss
->pub
, bssid
, ssid
, ssid_len
)) {
1462 bss_ref_get(rdev
, res
);
1467 spin_unlock_bh(&rdev
->bss_lock
);
1470 trace_cfg80211_return_bss(&res
->pub
);
1473 EXPORT_SYMBOL(cfg80211_get_bss
);
1475 static void rb_insert_bss(struct cfg80211_registered_device
*rdev
,
1476 struct cfg80211_internal_bss
*bss
)
1478 struct rb_node
**p
= &rdev
->bss_tree
.rb_node
;
1479 struct rb_node
*parent
= NULL
;
1480 struct cfg80211_internal_bss
*tbss
;
1485 tbss
= rb_entry(parent
, struct cfg80211_internal_bss
, rbn
);
1487 cmp
= cmp_bss(&bss
->pub
, &tbss
->pub
, BSS_CMP_REGULAR
);
1489 if (WARN_ON(!cmp
)) {
1490 /* will sort of leak this BSS */
1497 p
= &(*p
)->rb_right
;
1500 rb_link_node(&bss
->rbn
, parent
, p
);
1501 rb_insert_color(&bss
->rbn
, &rdev
->bss_tree
);
1504 static struct cfg80211_internal_bss
*
1505 rb_find_bss(struct cfg80211_registered_device
*rdev
,
1506 struct cfg80211_internal_bss
*res
,
1507 enum bss_compare_mode mode
)
1509 struct rb_node
*n
= rdev
->bss_tree
.rb_node
;
1510 struct cfg80211_internal_bss
*bss
;
1514 bss
= rb_entry(n
, struct cfg80211_internal_bss
, rbn
);
1515 r
= cmp_bss(&res
->pub
, &bss
->pub
, mode
);
1528 static bool cfg80211_combine_bsses(struct cfg80211_registered_device
*rdev
,
1529 struct cfg80211_internal_bss
*new)
1531 const struct cfg80211_bss_ies
*ies
;
1532 struct cfg80211_internal_bss
*bss
;
1538 ies
= rcu_access_pointer(new->pub
.beacon_ies
);
1542 ie
= cfg80211_find_ie(WLAN_EID_SSID
, ies
->data
, ies
->len
);
1549 for (i
= 0; i
< ssidlen
; i
++)
1553 /* not a hidden SSID */
1557 /* This is the bad part ... */
1559 list_for_each_entry(bss
, &rdev
->bss_list
, list
) {
1561 * we're iterating all the entries anyway, so take the
1562 * opportunity to validate the list length accounting
1566 if (!ether_addr_equal(bss
->pub
.bssid
, new->pub
.bssid
))
1568 if (bss
->pub
.channel
!= new->pub
.channel
)
1570 if (bss
->pub
.scan_width
!= new->pub
.scan_width
)
1572 if (rcu_access_pointer(bss
->pub
.beacon_ies
))
1574 ies
= rcu_access_pointer(bss
->pub
.ies
);
1577 ie
= cfg80211_find_ie(WLAN_EID_SSID
, ies
->data
, ies
->len
);
1580 if (ssidlen
&& ie
[1] != ssidlen
)
1582 if (WARN_ON_ONCE(bss
->pub
.hidden_beacon_bss
))
1584 if (WARN_ON_ONCE(!list_empty(&bss
->hidden_list
)))
1585 list_del(&bss
->hidden_list
);
1587 list_add(&bss
->hidden_list
, &new->hidden_list
);
1588 bss
->pub
.hidden_beacon_bss
= &new->pub
;
1589 new->refcount
+= bss
->refcount
;
1590 rcu_assign_pointer(bss
->pub
.beacon_ies
,
1591 new->pub
.beacon_ies
);
1594 WARN_ONCE(n_entries
!= rdev
->bss_entries
,
1595 "rdev bss entries[%d]/list[len:%d] corruption\n",
1596 rdev
->bss_entries
, n_entries
);
1601 struct cfg80211_non_tx_bss
{
1602 struct cfg80211_bss
*tx_bss
;
1603 u8 max_bssid_indicator
;
1608 cfg80211_update_known_bss(struct cfg80211_registered_device
*rdev
,
1609 struct cfg80211_internal_bss
*known
,
1610 struct cfg80211_internal_bss
*new,
1613 lockdep_assert_held(&rdev
->bss_lock
);
1616 if (rcu_access_pointer(new->pub
.proberesp_ies
)) {
1617 const struct cfg80211_bss_ies
*old
;
1619 old
= rcu_access_pointer(known
->pub
.proberesp_ies
);
1621 rcu_assign_pointer(known
->pub
.proberesp_ies
,
1622 new->pub
.proberesp_ies
);
1623 /* Override possible earlier Beacon frame IEs */
1624 rcu_assign_pointer(known
->pub
.ies
,
1625 new->pub
.proberesp_ies
);
1627 kfree_rcu((struct cfg80211_bss_ies
*)old
, rcu_head
);
1628 } else if (rcu_access_pointer(new->pub
.beacon_ies
)) {
1629 const struct cfg80211_bss_ies
*old
;
1630 struct cfg80211_internal_bss
*bss
;
1632 if (known
->pub
.hidden_beacon_bss
&&
1633 !list_empty(&known
->hidden_list
)) {
1634 const struct cfg80211_bss_ies
*f
;
1636 /* The known BSS struct is one of the probe
1637 * response members of a group, but we're
1638 * receiving a beacon (beacon_ies in the new
1639 * bss is used). This can only mean that the
1640 * AP changed its beacon from not having an
1641 * SSID to showing it, which is confusing so
1642 * drop this information.
1645 f
= rcu_access_pointer(new->pub
.beacon_ies
);
1646 kfree_rcu((struct cfg80211_bss_ies
*)f
, rcu_head
);
1650 old
= rcu_access_pointer(known
->pub
.beacon_ies
);
1652 rcu_assign_pointer(known
->pub
.beacon_ies
, new->pub
.beacon_ies
);
1654 /* Override IEs if they were from a beacon before */
1655 if (old
== rcu_access_pointer(known
->pub
.ies
))
1656 rcu_assign_pointer(known
->pub
.ies
, new->pub
.beacon_ies
);
1658 /* Assign beacon IEs to all sub entries */
1659 list_for_each_entry(bss
, &known
->hidden_list
, hidden_list
) {
1660 const struct cfg80211_bss_ies
*ies
;
1662 ies
= rcu_access_pointer(bss
->pub
.beacon_ies
);
1663 WARN_ON(ies
!= old
);
1665 rcu_assign_pointer(bss
->pub
.beacon_ies
,
1666 new->pub
.beacon_ies
);
1670 kfree_rcu((struct cfg80211_bss_ies
*)old
, rcu_head
);
1673 known
->pub
.beacon_interval
= new->pub
.beacon_interval
;
1675 /* don't update the signal if beacon was heard on
1679 known
->pub
.signal
= new->pub
.signal
;
1680 known
->pub
.capability
= new->pub
.capability
;
1681 known
->ts
= new->ts
;
1682 known
->ts_boottime
= new->ts_boottime
;
1683 known
->parent_tsf
= new->parent_tsf
;
1684 known
->pub
.chains
= new->pub
.chains
;
1685 memcpy(known
->pub
.chain_signal
, new->pub
.chain_signal
,
1686 IEEE80211_MAX_CHAINS
);
1687 ether_addr_copy(known
->parent_bssid
, new->parent_bssid
);
1688 known
->pub
.max_bssid_indicator
= new->pub
.max_bssid_indicator
;
1689 known
->pub
.bssid_index
= new->pub
.bssid_index
;
1694 /* Returned bss is reference counted and must be cleaned up appropriately. */
1695 struct cfg80211_internal_bss
*
1696 cfg80211_bss_update(struct cfg80211_registered_device
*rdev
,
1697 struct cfg80211_internal_bss
*tmp
,
1698 bool signal_valid
, unsigned long ts
)
1700 struct cfg80211_internal_bss
*found
= NULL
;
1702 if (WARN_ON(!tmp
->pub
.channel
))
1707 spin_lock_bh(&rdev
->bss_lock
);
1709 if (WARN_ON(!rcu_access_pointer(tmp
->pub
.ies
))) {
1710 spin_unlock_bh(&rdev
->bss_lock
);
1714 found
= rb_find_bss(rdev
, tmp
, BSS_CMP_REGULAR
);
1717 if (!cfg80211_update_known_bss(rdev
, found
, tmp
, signal_valid
))
1720 struct cfg80211_internal_bss
*new;
1721 struct cfg80211_internal_bss
*hidden
;
1722 struct cfg80211_bss_ies
*ies
;
1725 * create a copy -- the "res" variable that is passed in
1726 * is allocated on the stack since it's not needed in the
1727 * more common case of an update
1729 new = kzalloc(sizeof(*new) + rdev
->wiphy
.bss_priv_size
,
1732 ies
= (void *)rcu_dereference(tmp
->pub
.beacon_ies
);
1734 kfree_rcu(ies
, rcu_head
);
1735 ies
= (void *)rcu_dereference(tmp
->pub
.proberesp_ies
);
1737 kfree_rcu(ies
, rcu_head
);
1740 memcpy(new, tmp
, sizeof(*new));
1742 INIT_LIST_HEAD(&new->hidden_list
);
1743 INIT_LIST_HEAD(&new->pub
.nontrans_list
);
1745 if (rcu_access_pointer(tmp
->pub
.proberesp_ies
)) {
1746 hidden
= rb_find_bss(rdev
, tmp
, BSS_CMP_HIDE_ZLEN
);
1748 hidden
= rb_find_bss(rdev
, tmp
,
1751 new->pub
.hidden_beacon_bss
= &hidden
->pub
;
1752 list_add(&new->hidden_list
,
1753 &hidden
->hidden_list
);
1755 rcu_assign_pointer(new->pub
.beacon_ies
,
1756 hidden
->pub
.beacon_ies
);
1760 * Ok so we found a beacon, and don't have an entry. If
1761 * it's a beacon with hidden SSID, we might be in for an
1762 * expensive search for any probe responses that should
1763 * be grouped with this beacon for updates ...
1765 if (!cfg80211_combine_bsses(rdev
, new)) {
1766 bss_ref_put(rdev
, new);
1771 if (rdev
->bss_entries
>= bss_entries_limit
&&
1772 !cfg80211_bss_expire_oldest(rdev
)) {
1773 bss_ref_put(rdev
, new);
1777 /* This must be before the call to bss_ref_get */
1778 if (tmp
->pub
.transmitted_bss
) {
1779 struct cfg80211_internal_bss
*pbss
=
1780 container_of(tmp
->pub
.transmitted_bss
,
1781 struct cfg80211_internal_bss
,
1784 new->pub
.transmitted_bss
= tmp
->pub
.transmitted_bss
;
1785 bss_ref_get(rdev
, pbss
);
1788 list_add_tail(&new->list
, &rdev
->bss_list
);
1789 rdev
->bss_entries
++;
1790 rb_insert_bss(rdev
, new);
1794 rdev
->bss_generation
++;
1795 bss_ref_get(rdev
, found
);
1796 spin_unlock_bh(&rdev
->bss_lock
);
1800 spin_unlock_bh(&rdev
->bss_lock
);
1805 * Update RX channel information based on the available frame payload
1806 * information. This is mainly for the 2.4 GHz band where frames can be received
1807 * from neighboring channels and the Beacon frames use the DSSS Parameter Set
1808 * element to indicate the current (transmitting) channel, but this might also
1809 * be needed on other bands if RX frequency does not match with the actual
1810 * operating channel of a BSS.
1812 static struct ieee80211_channel
*
1813 cfg80211_get_bss_channel(struct wiphy
*wiphy
, const u8
*ie
, size_t ielen
,
1814 struct ieee80211_channel
*channel
,
1815 enum nl80211_bss_scan_width scan_width
)
1819 int channel_number
= -1;
1820 struct ieee80211_channel
*alt_channel
;
1822 if (channel
->band
== NL80211_BAND_S1GHZ
) {
1823 tmp
= cfg80211_find_ie(WLAN_EID_S1G_OPERATION
, ie
, ielen
);
1824 if (tmp
&& tmp
[1] >= sizeof(struct ieee80211_s1g_oper_ie
)) {
1825 struct ieee80211_s1g_oper_ie
*s1gop
= (void *)(tmp
+ 2);
1827 channel_number
= s1gop
->primary_ch
;
1830 tmp
= cfg80211_find_ie(WLAN_EID_DS_PARAMS
, ie
, ielen
);
1831 if (tmp
&& tmp
[1] == 1) {
1832 channel_number
= tmp
[2];
1834 tmp
= cfg80211_find_ie(WLAN_EID_HT_OPERATION
, ie
, ielen
);
1835 if (tmp
&& tmp
[1] >= sizeof(struct ieee80211_ht_operation
)) {
1836 struct ieee80211_ht_operation
*htop
= (void *)(tmp
+ 2);
1838 channel_number
= htop
->primary_chan
;
1843 if (channel_number
< 0) {
1844 /* No channel information in frame payload */
1848 freq
= ieee80211_channel_to_freq_khz(channel_number
, channel
->band
);
1849 alt_channel
= ieee80211_get_channel_khz(wiphy
, freq
);
1851 if (channel
->band
== NL80211_BAND_2GHZ
) {
1853 * Better not allow unexpected channels when that could
1854 * be going beyond the 1-11 range (e.g., discovering
1855 * BSS on channel 12 when radio is configured for
1861 /* No match for the payload channel number - ignore it */
1865 if (scan_width
== NL80211_BSS_CHAN_WIDTH_10
||
1866 scan_width
== NL80211_BSS_CHAN_WIDTH_5
) {
1868 * Ignore channel number in 5 and 10 MHz channels where there
1869 * may not be an n:1 or 1:n mapping between frequencies and
1876 * Use the channel determined through the payload channel number
1877 * instead of the RX channel reported by the driver.
1879 if (alt_channel
->flags
& IEEE80211_CHAN_DISABLED
)
1884 /* Returned bss is reference counted and must be cleaned up appropriately. */
1885 static struct cfg80211_bss
*
1886 cfg80211_inform_single_bss_data(struct wiphy
*wiphy
,
1887 struct cfg80211_inform_bss
*data
,
1888 enum cfg80211_bss_frame_type ftype
,
1889 const u8
*bssid
, u64 tsf
, u16 capability
,
1890 u16 beacon_interval
, const u8
*ie
, size_t ielen
,
1891 struct cfg80211_non_tx_bss
*non_tx_data
,
1894 struct cfg80211_registered_device
*rdev
= wiphy_to_rdev(wiphy
);
1895 struct cfg80211_bss_ies
*ies
;
1896 struct ieee80211_channel
*channel
;
1897 struct cfg80211_internal_bss tmp
= {}, *res
;
1902 if (WARN_ON(!wiphy
))
1905 if (WARN_ON(wiphy
->signal_type
== CFG80211_SIGNAL_TYPE_UNSPEC
&&
1906 (data
->signal
< 0 || data
->signal
> 100)))
1909 channel
= cfg80211_get_bss_channel(wiphy
, ie
, ielen
, data
->chan
,
1914 memcpy(tmp
.pub
.bssid
, bssid
, ETH_ALEN
);
1915 tmp
.pub
.channel
= channel
;
1916 tmp
.pub
.scan_width
= data
->scan_width
;
1917 tmp
.pub
.signal
= data
->signal
;
1918 tmp
.pub
.beacon_interval
= beacon_interval
;
1919 tmp
.pub
.capability
= capability
;
1920 tmp
.ts_boottime
= data
->boottime_ns
;
1921 tmp
.parent_tsf
= data
->parent_tsf
;
1922 ether_addr_copy(tmp
.parent_bssid
, data
->parent_bssid
);
1925 tmp
.pub
.transmitted_bss
= non_tx_data
->tx_bss
;
1926 ts
= bss_from_pub(non_tx_data
->tx_bss
)->ts
;
1927 tmp
.pub
.bssid_index
= non_tx_data
->bssid_index
;
1928 tmp
.pub
.max_bssid_indicator
= non_tx_data
->max_bssid_indicator
;
1934 * If we do not know here whether the IEs are from a Beacon or Probe
1935 * Response frame, we need to pick one of the options and only use it
1936 * with the driver that does not provide the full Beacon/Probe Response
1937 * frame. Use Beacon frame pointer to avoid indicating that this should
1938 * override the IEs pointer should we have received an earlier
1939 * indication of Probe Response data.
1941 ies
= kzalloc(sizeof(*ies
) + ielen
, gfp
);
1946 ies
->from_beacon
= false;
1947 memcpy(ies
->data
, ie
, ielen
);
1950 case CFG80211_BSS_FTYPE_BEACON
:
1951 ies
->from_beacon
= true;
1953 case CFG80211_BSS_FTYPE_UNKNOWN
:
1954 rcu_assign_pointer(tmp
.pub
.beacon_ies
, ies
);
1956 case CFG80211_BSS_FTYPE_PRESP
:
1957 rcu_assign_pointer(tmp
.pub
.proberesp_ies
, ies
);
1960 rcu_assign_pointer(tmp
.pub
.ies
, ies
);
1962 signal_valid
= data
->chan
== channel
;
1963 res
= cfg80211_bss_update(wiphy_to_rdev(wiphy
), &tmp
, signal_valid
, ts
);
1967 if (channel
->band
== NL80211_BAND_60GHZ
) {
1968 bss_type
= res
->pub
.capability
& WLAN_CAPABILITY_DMG_TYPE_MASK
;
1969 if (bss_type
== WLAN_CAPABILITY_DMG_TYPE_AP
||
1970 bss_type
== WLAN_CAPABILITY_DMG_TYPE_PBSS
)
1971 regulatory_hint_found_beacon(wiphy
, channel
, gfp
);
1973 if (res
->pub
.capability
& WLAN_CAPABILITY_ESS
)
1974 regulatory_hint_found_beacon(wiphy
, channel
, gfp
);
1978 /* this is a nontransmitting bss, we need to add it to
1979 * transmitting bss' list if it is not there
1981 spin_lock_bh(&rdev
->bss_lock
);
1982 if (cfg80211_add_nontrans_list(non_tx_data
->tx_bss
,
1984 if (__cfg80211_unlink_bss(rdev
, res
))
1985 rdev
->bss_generation
++;
1987 spin_unlock_bh(&rdev
->bss_lock
);
1990 trace_cfg80211_return_bss(&res
->pub
);
1991 /* cfg80211_bss_update gives us a referenced result */
1995 static const struct element
1996 *cfg80211_get_profile_continuation(const u8
*ie
, size_t ielen
,
1997 const struct element
*mbssid_elem
,
1998 const struct element
*sub_elem
)
2000 const u8
*mbssid_end
= mbssid_elem
->data
+ mbssid_elem
->datalen
;
2001 const struct element
*next_mbssid
;
2002 const struct element
*next_sub
;
2004 next_mbssid
= cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID
,
2006 ielen
- (mbssid_end
- ie
));
2009 * If it is not the last subelement in current MBSSID IE or there isn't
2010 * a next MBSSID IE - profile is complete.
2012 if ((sub_elem
->data
+ sub_elem
->datalen
< mbssid_end
- 1) ||
2016 /* For any length error, just return NULL */
2018 if (next_mbssid
->datalen
< 4)
2021 next_sub
= (void *)&next_mbssid
->data
[1];
2023 if (next_mbssid
->data
+ next_mbssid
->datalen
<
2024 next_sub
->data
+ next_sub
->datalen
)
2027 if (next_sub
->id
!= 0 || next_sub
->datalen
< 2)
2031 * Check if the first element in the next sub element is a start
2034 return next_sub
->data
[0] == WLAN_EID_NON_TX_BSSID_CAP
?
2038 size_t cfg80211_merge_profile(const u8
*ie
, size_t ielen
,
2039 const struct element
*mbssid_elem
,
2040 const struct element
*sub_elem
,
2041 u8
*merged_ie
, size_t max_copy_len
)
2043 size_t copied_len
= sub_elem
->datalen
;
2044 const struct element
*next_mbssid
;
2046 if (sub_elem
->datalen
> max_copy_len
)
2049 memcpy(merged_ie
, sub_elem
->data
, sub_elem
->datalen
);
2051 while ((next_mbssid
= cfg80211_get_profile_continuation(ie
, ielen
,
2054 const struct element
*next_sub
= (void *)&next_mbssid
->data
[1];
2056 if (copied_len
+ next_sub
->datalen
> max_copy_len
)
2058 memcpy(merged_ie
+ copied_len
, next_sub
->data
,
2060 copied_len
+= next_sub
->datalen
;
2065 EXPORT_SYMBOL(cfg80211_merge_profile
);
2067 static void cfg80211_parse_mbssid_data(struct wiphy
*wiphy
,
2068 struct cfg80211_inform_bss
*data
,
2069 enum cfg80211_bss_frame_type ftype
,
2070 const u8
*bssid
, u64 tsf
,
2071 u16 beacon_interval
, const u8
*ie
,
2073 struct cfg80211_non_tx_bss
*non_tx_data
,
2076 const u8
*mbssid_index_ie
;
2077 const struct element
*elem
, *sub
;
2079 u8 new_bssid
[ETH_ALEN
];
2080 u8
*new_ie
, *profile
;
2081 u64 seen_indices
= 0;
2083 struct cfg80211_bss
*bss
;
2087 if (!cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID
, ie
, ielen
))
2089 if (!wiphy
->support_mbssid
)
2091 if (wiphy
->support_only_he_mbssid
&&
2092 !cfg80211_find_ext_ie(WLAN_EID_EXT_HE_CAPABILITY
, ie
, ielen
))
2095 new_ie
= kmalloc(IEEE80211_MAX_DATA_LEN
, gfp
);
2099 profile
= kmalloc(ielen
, gfp
);
2103 for_each_element_id(elem
, WLAN_EID_MULTIPLE_BSSID
, ie
, ielen
) {
2104 if (elem
->datalen
< 4)
2106 for_each_element(sub
, elem
->data
+ 1, elem
->datalen
- 1) {
2109 if (sub
->id
!= 0 || sub
->datalen
< 4) {
2110 /* not a valid BSS profile */
2114 if (sub
->data
[0] != WLAN_EID_NON_TX_BSSID_CAP
||
2115 sub
->data
[1] != 2) {
2116 /* The first element within the Nontransmitted
2117 * BSSID Profile is not the Nontransmitted
2118 * BSSID Capability element.
2123 memset(profile
, 0, ielen
);
2124 profile_len
= cfg80211_merge_profile(ie
, ielen
,
2130 /* found a Nontransmitted BSSID Profile */
2131 mbssid_index_ie
= cfg80211_find_ie
2132 (WLAN_EID_MULTI_BSSID_IDX
,
2133 profile
, profile_len
);
2134 if (!mbssid_index_ie
|| mbssid_index_ie
[1] < 1 ||
2135 mbssid_index_ie
[2] == 0 ||
2136 mbssid_index_ie
[2] > 46) {
2137 /* No valid Multiple BSSID-Index element */
2141 if (seen_indices
& BIT_ULL(mbssid_index_ie
[2]))
2142 /* We don't support legacy split of a profile */
2143 net_dbg_ratelimited("Partial info for BSSID index %d\n",
2144 mbssid_index_ie
[2]);
2146 seen_indices
|= BIT_ULL(mbssid_index_ie
[2]);
2148 non_tx_data
->bssid_index
= mbssid_index_ie
[2];
2149 non_tx_data
->max_bssid_indicator
= elem
->data
[0];
2151 cfg80211_gen_new_bssid(bssid
,
2152 non_tx_data
->max_bssid_indicator
,
2153 non_tx_data
->bssid_index
,
2155 memset(new_ie
, 0, IEEE80211_MAX_DATA_LEN
);
2156 new_ie_len
= cfg80211_gen_new_ie(ie
, ielen
,
2158 profile_len
, new_ie
,
2163 capability
= get_unaligned_le16(profile
+ 2);
2164 bss
= cfg80211_inform_single_bss_data(wiphy
, data
,
2175 cfg80211_put_bss(wiphy
, bss
);
2184 struct cfg80211_bss
*
2185 cfg80211_inform_bss_data(struct wiphy
*wiphy
,
2186 struct cfg80211_inform_bss
*data
,
2187 enum cfg80211_bss_frame_type ftype
,
2188 const u8
*bssid
, u64 tsf
, u16 capability
,
2189 u16 beacon_interval
, const u8
*ie
, size_t ielen
,
2192 struct cfg80211_bss
*res
;
2193 struct cfg80211_non_tx_bss non_tx_data
;
2195 res
= cfg80211_inform_single_bss_data(wiphy
, data
, ftype
, bssid
, tsf
,
2196 capability
, beacon_interval
, ie
,
2200 non_tx_data
.tx_bss
= res
;
2201 cfg80211_parse_mbssid_data(wiphy
, data
, ftype
, bssid
, tsf
,
2202 beacon_interval
, ie
, ielen
, &non_tx_data
,
2206 EXPORT_SYMBOL(cfg80211_inform_bss_data
);
2209 cfg80211_parse_mbssid_frame_data(struct wiphy
*wiphy
,
2210 struct cfg80211_inform_bss
*data
,
2211 struct ieee80211_mgmt
*mgmt
, size_t len
,
2212 struct cfg80211_non_tx_bss
*non_tx_data
,
2215 enum cfg80211_bss_frame_type ftype
;
2216 const u8
*ie
= mgmt
->u
.probe_resp
.variable
;
2217 size_t ielen
= len
- offsetof(struct ieee80211_mgmt
,
2218 u
.probe_resp
.variable
);
2220 ftype
= ieee80211_is_beacon(mgmt
->frame_control
) ?
2221 CFG80211_BSS_FTYPE_BEACON
: CFG80211_BSS_FTYPE_PRESP
;
2223 cfg80211_parse_mbssid_data(wiphy
, data
, ftype
, mgmt
->bssid
,
2224 le64_to_cpu(mgmt
->u
.probe_resp
.timestamp
),
2225 le16_to_cpu(mgmt
->u
.probe_resp
.beacon_int
),
2226 ie
, ielen
, non_tx_data
, gfp
);
2230 cfg80211_update_notlisted_nontrans(struct wiphy
*wiphy
,
2231 struct cfg80211_bss
*nontrans_bss
,
2232 struct ieee80211_mgmt
*mgmt
, size_t len
)
2234 u8
*ie
, *new_ie
, *pos
;
2235 const u8
*nontrans_ssid
, *trans_ssid
, *mbssid
;
2236 size_t ielen
= len
- offsetof(struct ieee80211_mgmt
,
2237 u
.probe_resp
.variable
);
2239 struct cfg80211_bss_ies
*new_ies
;
2240 const struct cfg80211_bss_ies
*old
;
2243 lockdep_assert_held(&wiphy_to_rdev(wiphy
)->bss_lock
);
2245 ie
= mgmt
->u
.probe_resp
.variable
;
2248 trans_ssid
= cfg80211_find_ie(WLAN_EID_SSID
, ie
, ielen
);
2251 new_ie_len
-= trans_ssid
[1];
2252 mbssid
= cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID
, ie
, ielen
);
2254 * It's not valid to have the MBSSID element before SSID
2255 * ignore if that happens - the code below assumes it is
2256 * after (while copying things inbetween).
2258 if (!mbssid
|| mbssid
< trans_ssid
)
2260 new_ie_len
-= mbssid
[1];
2262 nontrans_ssid
= ieee80211_bss_get_ie(nontrans_bss
, WLAN_EID_SSID
);
2266 new_ie_len
+= nontrans_ssid
[1];
2268 /* generate new ie for nontrans BSS
2269 * 1. replace SSID with nontrans BSS' SSID
2272 new_ie
= kzalloc(new_ie_len
, GFP_ATOMIC
);
2276 new_ies
= kzalloc(sizeof(*new_ies
) + new_ie_len
, GFP_ATOMIC
);
2282 /* copy the nontransmitted SSID */
2283 cpy_len
= nontrans_ssid
[1] + 2;
2284 memcpy(pos
, nontrans_ssid
, cpy_len
);
2286 /* copy the IEs between SSID and MBSSID */
2287 cpy_len
= trans_ssid
[1] + 2;
2288 memcpy(pos
, (trans_ssid
+ cpy_len
), (mbssid
- (trans_ssid
+ cpy_len
)));
2289 pos
+= (mbssid
- (trans_ssid
+ cpy_len
));
2290 /* copy the IEs after MBSSID */
2291 cpy_len
= mbssid
[1] + 2;
2292 memcpy(pos
, mbssid
+ cpy_len
, ((ie
+ ielen
) - (mbssid
+ cpy_len
)));
2295 new_ies
->len
= new_ie_len
;
2296 new_ies
->tsf
= le64_to_cpu(mgmt
->u
.probe_resp
.timestamp
);
2297 new_ies
->from_beacon
= ieee80211_is_beacon(mgmt
->frame_control
);
2298 memcpy(new_ies
->data
, new_ie
, new_ie_len
);
2299 if (ieee80211_is_probe_resp(mgmt
->frame_control
)) {
2300 old
= rcu_access_pointer(nontrans_bss
->proberesp_ies
);
2301 rcu_assign_pointer(nontrans_bss
->proberesp_ies
, new_ies
);
2302 rcu_assign_pointer(nontrans_bss
->ies
, new_ies
);
2304 kfree_rcu((struct cfg80211_bss_ies
*)old
, rcu_head
);
2306 old
= rcu_access_pointer(nontrans_bss
->beacon_ies
);
2307 rcu_assign_pointer(nontrans_bss
->beacon_ies
, new_ies
);
2308 rcu_assign_pointer(nontrans_bss
->ies
, new_ies
);
2310 kfree_rcu((struct cfg80211_bss_ies
*)old
, rcu_head
);
2317 /* cfg80211_inform_bss_width_frame helper */
2318 static struct cfg80211_bss
*
2319 cfg80211_inform_single_bss_frame_data(struct wiphy
*wiphy
,
2320 struct cfg80211_inform_bss
*data
,
2321 struct ieee80211_mgmt
*mgmt
, size_t len
,
2324 struct cfg80211_internal_bss tmp
= {}, *res
;
2325 struct cfg80211_bss_ies
*ies
;
2326 struct ieee80211_channel
*channel
;
2328 struct ieee80211_ext
*ext
= NULL
;
2329 u8
*bssid
, *variable
;
2330 u16 capability
, beacon_int
;
2331 size_t ielen
, min_hdr_len
= offsetof(struct ieee80211_mgmt
,
2332 u
.probe_resp
.variable
);
2335 BUILD_BUG_ON(offsetof(struct ieee80211_mgmt
, u
.probe_resp
.variable
) !=
2336 offsetof(struct ieee80211_mgmt
, u
.beacon
.variable
));
2338 trace_cfg80211_inform_bss_frame(wiphy
, data
, mgmt
, len
);
2343 if (WARN_ON(!wiphy
))
2346 if (WARN_ON(wiphy
->signal_type
== CFG80211_SIGNAL_TYPE_UNSPEC
&&
2347 (data
->signal
< 0 || data
->signal
> 100)))
2350 if (ieee80211_is_s1g_beacon(mgmt
->frame_control
)) {
2351 ext
= (void *) mgmt
;
2352 min_hdr_len
= offsetof(struct ieee80211_ext
, u
.s1g_beacon
);
2353 if (ieee80211_is_s1g_short_beacon(mgmt
->frame_control
))
2354 min_hdr_len
= offsetof(struct ieee80211_ext
,
2355 u
.s1g_short_beacon
.variable
);
2358 if (WARN_ON(len
< min_hdr_len
))
2361 ielen
= len
- min_hdr_len
;
2362 variable
= mgmt
->u
.probe_resp
.variable
;
2364 if (ieee80211_is_s1g_short_beacon(mgmt
->frame_control
))
2365 variable
= ext
->u
.s1g_short_beacon
.variable
;
2367 variable
= ext
->u
.s1g_beacon
.variable
;
2370 channel
= cfg80211_get_bss_channel(wiphy
, variable
,
2371 ielen
, data
->chan
, data
->scan_width
);
2376 const struct ieee80211_s1g_bcn_compat_ie
*compat
;
2377 const struct element
*elem
;
2379 elem
= cfg80211_find_elem(WLAN_EID_S1G_BCN_COMPAT
,
2383 if (elem
->datalen
< sizeof(*compat
))
2385 compat
= (void *)elem
->data
;
2386 bssid
= ext
->u
.s1g_beacon
.sa
;
2387 capability
= le16_to_cpu(compat
->compat_info
);
2388 beacon_int
= le16_to_cpu(compat
->beacon_int
);
2390 bssid
= mgmt
->bssid
;
2391 beacon_int
= le16_to_cpu(mgmt
->u
.probe_resp
.beacon_int
);
2392 capability
= le16_to_cpu(mgmt
->u
.probe_resp
.capab_info
);
2395 ies
= kzalloc(sizeof(*ies
) + ielen
, gfp
);
2399 ies
->tsf
= le64_to_cpu(mgmt
->u
.probe_resp
.timestamp
);
2400 ies
->from_beacon
= ieee80211_is_beacon(mgmt
->frame_control
) ||
2401 ieee80211_is_s1g_beacon(mgmt
->frame_control
);
2402 memcpy(ies
->data
, variable
, ielen
);
2404 if (ieee80211_is_probe_resp(mgmt
->frame_control
))
2405 rcu_assign_pointer(tmp
.pub
.proberesp_ies
, ies
);
2407 rcu_assign_pointer(tmp
.pub
.beacon_ies
, ies
);
2408 rcu_assign_pointer(tmp
.pub
.ies
, ies
);
2410 memcpy(tmp
.pub
.bssid
, bssid
, ETH_ALEN
);
2411 tmp
.pub
.beacon_interval
= beacon_int
;
2412 tmp
.pub
.capability
= capability
;
2413 tmp
.pub
.channel
= channel
;
2414 tmp
.pub
.scan_width
= data
->scan_width
;
2415 tmp
.pub
.signal
= data
->signal
;
2416 tmp
.ts_boottime
= data
->boottime_ns
;
2417 tmp
.parent_tsf
= data
->parent_tsf
;
2418 tmp
.pub
.chains
= data
->chains
;
2419 memcpy(tmp
.pub
.chain_signal
, data
->chain_signal
, IEEE80211_MAX_CHAINS
);
2420 ether_addr_copy(tmp
.parent_bssid
, data
->parent_bssid
);
2422 signal_valid
= data
->chan
== channel
;
2423 res
= cfg80211_bss_update(wiphy_to_rdev(wiphy
), &tmp
, signal_valid
,
2428 if (channel
->band
== NL80211_BAND_60GHZ
) {
2429 bss_type
= res
->pub
.capability
& WLAN_CAPABILITY_DMG_TYPE_MASK
;
2430 if (bss_type
== WLAN_CAPABILITY_DMG_TYPE_AP
||
2431 bss_type
== WLAN_CAPABILITY_DMG_TYPE_PBSS
)
2432 regulatory_hint_found_beacon(wiphy
, channel
, gfp
);
2434 if (res
->pub
.capability
& WLAN_CAPABILITY_ESS
)
2435 regulatory_hint_found_beacon(wiphy
, channel
, gfp
);
2438 trace_cfg80211_return_bss(&res
->pub
);
2439 /* cfg80211_bss_update gives us a referenced result */
2443 struct cfg80211_bss
*
2444 cfg80211_inform_bss_frame_data(struct wiphy
*wiphy
,
2445 struct cfg80211_inform_bss
*data
,
2446 struct ieee80211_mgmt
*mgmt
, size_t len
,
2449 struct cfg80211_bss
*res
, *tmp_bss
;
2450 const u8
*ie
= mgmt
->u
.probe_resp
.variable
;
2451 const struct cfg80211_bss_ies
*ies1
, *ies2
;
2452 size_t ielen
= len
- offsetof(struct ieee80211_mgmt
,
2453 u
.probe_resp
.variable
);
2454 struct cfg80211_non_tx_bss non_tx_data
;
2456 res
= cfg80211_inform_single_bss_frame_data(wiphy
, data
, mgmt
,
2458 if (!res
|| !wiphy
->support_mbssid
||
2459 !cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID
, ie
, ielen
))
2461 if (wiphy
->support_only_he_mbssid
&&
2462 !cfg80211_find_ext_ie(WLAN_EID_EXT_HE_CAPABILITY
, ie
, ielen
))
2465 non_tx_data
.tx_bss
= res
;
2466 /* process each non-transmitting bss */
2467 cfg80211_parse_mbssid_frame_data(wiphy
, data
, mgmt
, len
,
2470 spin_lock_bh(&wiphy_to_rdev(wiphy
)->bss_lock
);
2472 /* check if the res has other nontransmitting bss which is not
2475 ies1
= rcu_access_pointer(res
->ies
);
2477 /* go through nontrans_list, if the timestamp of the BSS is
2478 * earlier than the timestamp of the transmitting BSS then
2481 list_for_each_entry(tmp_bss
, &res
->nontrans_list
,
2483 ies2
= rcu_access_pointer(tmp_bss
->ies
);
2484 if (ies2
->tsf
< ies1
->tsf
)
2485 cfg80211_update_notlisted_nontrans(wiphy
, tmp_bss
,
2488 spin_unlock_bh(&wiphy_to_rdev(wiphy
)->bss_lock
);
2492 EXPORT_SYMBOL(cfg80211_inform_bss_frame_data
);
2494 void cfg80211_ref_bss(struct wiphy
*wiphy
, struct cfg80211_bss
*pub
)
2496 struct cfg80211_registered_device
*rdev
= wiphy_to_rdev(wiphy
);
2497 struct cfg80211_internal_bss
*bss
;
2502 bss
= container_of(pub
, struct cfg80211_internal_bss
, pub
);
2504 spin_lock_bh(&rdev
->bss_lock
);
2505 bss_ref_get(rdev
, bss
);
2506 spin_unlock_bh(&rdev
->bss_lock
);
2508 EXPORT_SYMBOL(cfg80211_ref_bss
);
2510 void cfg80211_put_bss(struct wiphy
*wiphy
, struct cfg80211_bss
*pub
)
2512 struct cfg80211_registered_device
*rdev
= wiphy_to_rdev(wiphy
);
2513 struct cfg80211_internal_bss
*bss
;
2518 bss
= container_of(pub
, struct cfg80211_internal_bss
, pub
);
2520 spin_lock_bh(&rdev
->bss_lock
);
2521 bss_ref_put(rdev
, bss
);
2522 spin_unlock_bh(&rdev
->bss_lock
);
2524 EXPORT_SYMBOL(cfg80211_put_bss
);
2526 void cfg80211_unlink_bss(struct wiphy
*wiphy
, struct cfg80211_bss
*pub
)
2528 struct cfg80211_registered_device
*rdev
= wiphy_to_rdev(wiphy
);
2529 struct cfg80211_internal_bss
*bss
, *tmp1
;
2530 struct cfg80211_bss
*nontrans_bss
, *tmp
;
2535 bss
= container_of(pub
, struct cfg80211_internal_bss
, pub
);
2537 spin_lock_bh(&rdev
->bss_lock
);
2538 if (list_empty(&bss
->list
))
2541 list_for_each_entry_safe(nontrans_bss
, tmp
,
2542 &pub
->nontrans_list
,
2544 tmp1
= container_of(nontrans_bss
,
2545 struct cfg80211_internal_bss
, pub
);
2546 if (__cfg80211_unlink_bss(rdev
, tmp1
))
2547 rdev
->bss_generation
++;
2550 if (__cfg80211_unlink_bss(rdev
, bss
))
2551 rdev
->bss_generation
++;
2553 spin_unlock_bh(&rdev
->bss_lock
);
2555 EXPORT_SYMBOL(cfg80211_unlink_bss
);
2557 void cfg80211_bss_iter(struct wiphy
*wiphy
,
2558 struct cfg80211_chan_def
*chandef
,
2559 void (*iter
)(struct wiphy
*wiphy
,
2560 struct cfg80211_bss
*bss
,
2564 struct cfg80211_registered_device
*rdev
= wiphy_to_rdev(wiphy
);
2565 struct cfg80211_internal_bss
*bss
;
2567 spin_lock_bh(&rdev
->bss_lock
);
2569 list_for_each_entry(bss
, &rdev
->bss_list
, list
) {
2570 if (!chandef
|| cfg80211_is_sub_chan(chandef
, bss
->pub
.channel
))
2571 iter(wiphy
, &bss
->pub
, iter_data
);
2574 spin_unlock_bh(&rdev
->bss_lock
);
2576 EXPORT_SYMBOL(cfg80211_bss_iter
);
2578 void cfg80211_update_assoc_bss_entry(struct wireless_dev
*wdev
,
2579 struct ieee80211_channel
*chan
)
2581 struct wiphy
*wiphy
= wdev
->wiphy
;
2582 struct cfg80211_registered_device
*rdev
= wiphy_to_rdev(wiphy
);
2583 struct cfg80211_internal_bss
*cbss
= wdev
->current_bss
;
2584 struct cfg80211_internal_bss
*new = NULL
;
2585 struct cfg80211_internal_bss
*bss
;
2586 struct cfg80211_bss
*nontrans_bss
;
2587 struct cfg80211_bss
*tmp
;
2589 spin_lock_bh(&rdev
->bss_lock
);
2592 * Some APs use CSA also for bandwidth changes, i.e., without actually
2593 * changing the control channel, so no need to update in such a case.
2595 if (cbss
->pub
.channel
== chan
)
2598 /* use transmitting bss */
2599 if (cbss
->pub
.transmitted_bss
)
2600 cbss
= container_of(cbss
->pub
.transmitted_bss
,
2601 struct cfg80211_internal_bss
,
2604 cbss
->pub
.channel
= chan
;
2606 list_for_each_entry(bss
, &rdev
->bss_list
, list
) {
2607 if (!cfg80211_bss_type_match(bss
->pub
.capability
,
2608 bss
->pub
.channel
->band
,
2609 wdev
->conn_bss_type
))
2615 if (!cmp_bss(&bss
->pub
, &cbss
->pub
, BSS_CMP_REGULAR
)) {
2622 /* to save time, update IEs for transmitting bss only */
2623 if (cfg80211_update_known_bss(rdev
, cbss
, new, false)) {
2624 new->pub
.proberesp_ies
= NULL
;
2625 new->pub
.beacon_ies
= NULL
;
2628 list_for_each_entry_safe(nontrans_bss
, tmp
,
2629 &new->pub
.nontrans_list
,
2631 bss
= container_of(nontrans_bss
,
2632 struct cfg80211_internal_bss
, pub
);
2633 if (__cfg80211_unlink_bss(rdev
, bss
))
2634 rdev
->bss_generation
++;
2637 WARN_ON(atomic_read(&new->hold
));
2638 if (!WARN_ON(!__cfg80211_unlink_bss(rdev
, new)))
2639 rdev
->bss_generation
++;
2642 rb_erase(&cbss
->rbn
, &rdev
->bss_tree
);
2643 rb_insert_bss(rdev
, cbss
);
2644 rdev
->bss_generation
++;
2646 list_for_each_entry_safe(nontrans_bss
, tmp
,
2647 &cbss
->pub
.nontrans_list
,
2649 bss
= container_of(nontrans_bss
,
2650 struct cfg80211_internal_bss
, pub
);
2651 bss
->pub
.channel
= chan
;
2652 rb_erase(&bss
->rbn
, &rdev
->bss_tree
);
2653 rb_insert_bss(rdev
, bss
);
2654 rdev
->bss_generation
++;
2658 spin_unlock_bh(&rdev
->bss_lock
);
2661 #ifdef CONFIG_CFG80211_WEXT
2662 static struct cfg80211_registered_device
*
2663 cfg80211_get_dev_from_ifindex(struct net
*net
, int ifindex
)
2665 struct cfg80211_registered_device
*rdev
;
2666 struct net_device
*dev
;
2670 dev
= dev_get_by_index(net
, ifindex
);
2672 return ERR_PTR(-ENODEV
);
2673 if (dev
->ieee80211_ptr
)
2674 rdev
= wiphy_to_rdev(dev
->ieee80211_ptr
->wiphy
);
2676 rdev
= ERR_PTR(-ENODEV
);
2681 int cfg80211_wext_siwscan(struct net_device
*dev
,
2682 struct iw_request_info
*info
,
2683 union iwreq_data
*wrqu
, char *extra
)
2685 struct cfg80211_registered_device
*rdev
;
2686 struct wiphy
*wiphy
;
2687 struct iw_scan_req
*wreq
= NULL
;
2688 struct cfg80211_scan_request
*creq
= NULL
;
2689 int i
, err
, n_channels
= 0;
2690 enum nl80211_band band
;
2692 if (!netif_running(dev
))
2695 if (wrqu
->data
.length
== sizeof(struct iw_scan_req
))
2696 wreq
= (struct iw_scan_req
*)extra
;
2698 rdev
= cfg80211_get_dev_from_ifindex(dev_net(dev
), dev
->ifindex
);
2701 return PTR_ERR(rdev
);
2703 if (rdev
->scan_req
|| rdev
->scan_msg
) {
2708 wiphy
= &rdev
->wiphy
;
2710 /* Determine number of channels, needed to allocate creq */
2711 if (wreq
&& wreq
->num_channels
)
2712 n_channels
= wreq
->num_channels
;
2714 n_channels
= ieee80211_get_num_supported_channels(wiphy
);
2716 creq
= kzalloc(sizeof(*creq
) + sizeof(struct cfg80211_ssid
) +
2717 n_channels
* sizeof(void *),
2724 creq
->wiphy
= wiphy
;
2725 creq
->wdev
= dev
->ieee80211_ptr
;
2726 /* SSIDs come after channels */
2727 creq
->ssids
= (void *)&creq
->channels
[n_channels
];
2728 creq
->n_channels
= n_channels
;
2730 creq
->scan_start
= jiffies
;
2732 /* translate "Scan on frequencies" request */
2734 for (band
= 0; band
< NUM_NL80211_BANDS
; band
++) {
2737 if (!wiphy
->bands
[band
])
2740 for (j
= 0; j
< wiphy
->bands
[band
]->n_channels
; j
++) {
2741 /* ignore disabled channels */
2742 if (wiphy
->bands
[band
]->channels
[j
].flags
&
2743 IEEE80211_CHAN_DISABLED
)
2746 /* If we have a wireless request structure and the
2747 * wireless request specifies frequencies, then search
2748 * for the matching hardware channel.
2750 if (wreq
&& wreq
->num_channels
) {
2752 int wiphy_freq
= wiphy
->bands
[band
]->channels
[j
].center_freq
;
2753 for (k
= 0; k
< wreq
->num_channels
; k
++) {
2754 struct iw_freq
*freq
=
2755 &wreq
->channel_list
[k
];
2757 cfg80211_wext_freq(freq
);
2759 if (wext_freq
== wiphy_freq
)
2760 goto wext_freq_found
;
2762 goto wext_freq_not_found
;
2766 creq
->channels
[i
] = &wiphy
->bands
[band
]->channels
[j
];
2768 wext_freq_not_found
: ;
2771 /* No channels found? */
2777 /* Set real number of channels specified in creq->channels[] */
2778 creq
->n_channels
= i
;
2780 /* translate "Scan for SSID" request */
2782 if (wrqu
->data
.flags
& IW_SCAN_THIS_ESSID
) {
2783 if (wreq
->essid_len
> IEEE80211_MAX_SSID_LEN
) {
2787 memcpy(creq
->ssids
[0].ssid
, wreq
->essid
, wreq
->essid_len
);
2788 creq
->ssids
[0].ssid_len
= wreq
->essid_len
;
2790 if (wreq
->scan_type
== IW_SCAN_TYPE_PASSIVE
)
2794 for (i
= 0; i
< NUM_NL80211_BANDS
; i
++)
2795 if (wiphy
->bands
[i
])
2796 creq
->rates
[i
] = (1 << wiphy
->bands
[i
]->n_bitrates
) - 1;
2798 eth_broadcast_addr(creq
->bssid
);
2800 wiphy_lock(&rdev
->wiphy
);
2802 rdev
->scan_req
= creq
;
2803 err
= rdev_scan(rdev
, creq
);
2805 rdev
->scan_req
= NULL
;
2806 /* creq will be freed below */
2808 nl80211_send_scan_start(rdev
, dev
->ieee80211_ptr
);
2809 /* creq now owned by driver */
2813 wiphy_unlock(&rdev
->wiphy
);
2818 EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan
);
2820 static char *ieee80211_scan_add_ies(struct iw_request_info
*info
,
2821 const struct cfg80211_bss_ies
*ies
,
2822 char *current_ev
, char *end_buf
)
2824 const u8
*pos
, *end
, *next
;
2825 struct iw_event iwe
;
2831 * If needed, fragment the IEs buffer (at IE boundaries) into short
2832 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
2835 end
= pos
+ ies
->len
;
2837 while (end
- pos
> IW_GENERIC_IE_MAX
) {
2838 next
= pos
+ 2 + pos
[1];
2839 while (next
+ 2 + next
[1] - pos
< IW_GENERIC_IE_MAX
)
2840 next
= next
+ 2 + next
[1];
2842 memset(&iwe
, 0, sizeof(iwe
));
2843 iwe
.cmd
= IWEVGENIE
;
2844 iwe
.u
.data
.length
= next
- pos
;
2845 current_ev
= iwe_stream_add_point_check(info
, current_ev
,
2848 if (IS_ERR(current_ev
))
2854 memset(&iwe
, 0, sizeof(iwe
));
2855 iwe
.cmd
= IWEVGENIE
;
2856 iwe
.u
.data
.length
= end
- pos
;
2857 current_ev
= iwe_stream_add_point_check(info
, current_ev
,
2860 if (IS_ERR(current_ev
))
2868 ieee80211_bss(struct wiphy
*wiphy
, struct iw_request_info
*info
,
2869 struct cfg80211_internal_bss
*bss
, char *current_ev
,
2872 const struct cfg80211_bss_ies
*ies
;
2873 struct iw_event iwe
;
2878 bool ismesh
= false;
2880 memset(&iwe
, 0, sizeof(iwe
));
2881 iwe
.cmd
= SIOCGIWAP
;
2882 iwe
.u
.ap_addr
.sa_family
= ARPHRD_ETHER
;
2883 memcpy(iwe
.u
.ap_addr
.sa_data
, bss
->pub
.bssid
, ETH_ALEN
);
2884 current_ev
= iwe_stream_add_event_check(info
, current_ev
, end_buf
, &iwe
,
2886 if (IS_ERR(current_ev
))
2889 memset(&iwe
, 0, sizeof(iwe
));
2890 iwe
.cmd
= SIOCGIWFREQ
;
2891 iwe
.u
.freq
.m
= ieee80211_frequency_to_channel(bss
->pub
.channel
->center_freq
);
2893 current_ev
= iwe_stream_add_event_check(info
, current_ev
, end_buf
, &iwe
,
2895 if (IS_ERR(current_ev
))
2898 memset(&iwe
, 0, sizeof(iwe
));
2899 iwe
.cmd
= SIOCGIWFREQ
;
2900 iwe
.u
.freq
.m
= bss
->pub
.channel
->center_freq
;
2902 current_ev
= iwe_stream_add_event_check(info
, current_ev
, end_buf
, &iwe
,
2904 if (IS_ERR(current_ev
))
2907 if (wiphy
->signal_type
!= CFG80211_SIGNAL_TYPE_NONE
) {
2908 memset(&iwe
, 0, sizeof(iwe
));
2910 iwe
.u
.qual
.updated
= IW_QUAL_LEVEL_UPDATED
|
2911 IW_QUAL_NOISE_INVALID
|
2912 IW_QUAL_QUAL_UPDATED
;
2913 switch (wiphy
->signal_type
) {
2914 case CFG80211_SIGNAL_TYPE_MBM
:
2915 sig
= bss
->pub
.signal
/ 100;
2916 iwe
.u
.qual
.level
= sig
;
2917 iwe
.u
.qual
.updated
|= IW_QUAL_DBM
;
2918 if (sig
< -110) /* rather bad */
2920 else if (sig
> -40) /* perfect */
2922 /* will give a range of 0 .. 70 */
2923 iwe
.u
.qual
.qual
= sig
+ 110;
2925 case CFG80211_SIGNAL_TYPE_UNSPEC
:
2926 iwe
.u
.qual
.level
= bss
->pub
.signal
;
2927 /* will give range 0 .. 100 */
2928 iwe
.u
.qual
.qual
= bss
->pub
.signal
;
2934 current_ev
= iwe_stream_add_event_check(info
, current_ev
,
2937 if (IS_ERR(current_ev
))
2941 memset(&iwe
, 0, sizeof(iwe
));
2942 iwe
.cmd
= SIOCGIWENCODE
;
2943 if (bss
->pub
.capability
& WLAN_CAPABILITY_PRIVACY
)
2944 iwe
.u
.data
.flags
= IW_ENCODE_ENABLED
| IW_ENCODE_NOKEY
;
2946 iwe
.u
.data
.flags
= IW_ENCODE_DISABLED
;
2947 iwe
.u
.data
.length
= 0;
2948 current_ev
= iwe_stream_add_point_check(info
, current_ev
, end_buf
,
2950 if (IS_ERR(current_ev
))
2954 ies
= rcu_dereference(bss
->pub
.ies
);
2960 if (ie
[1] > rem
- 2)
2965 memset(&iwe
, 0, sizeof(iwe
));
2966 iwe
.cmd
= SIOCGIWESSID
;
2967 iwe
.u
.data
.length
= ie
[1];
2968 iwe
.u
.data
.flags
= 1;
2969 current_ev
= iwe_stream_add_point_check(info
,
2973 if (IS_ERR(current_ev
))
2976 case WLAN_EID_MESH_ID
:
2977 memset(&iwe
, 0, sizeof(iwe
));
2978 iwe
.cmd
= SIOCGIWESSID
;
2979 iwe
.u
.data
.length
= ie
[1];
2980 iwe
.u
.data
.flags
= 1;
2981 current_ev
= iwe_stream_add_point_check(info
,
2985 if (IS_ERR(current_ev
))
2988 case WLAN_EID_MESH_CONFIG
:
2990 if (ie
[1] != sizeof(struct ieee80211_meshconf_ie
))
2993 memset(&iwe
, 0, sizeof(iwe
));
2994 iwe
.cmd
= IWEVCUSTOM
;
2995 sprintf(buf
, "Mesh Network Path Selection Protocol ID: "
2997 iwe
.u
.data
.length
= strlen(buf
);
2998 current_ev
= iwe_stream_add_point_check(info
,
3002 if (IS_ERR(current_ev
))
3004 sprintf(buf
, "Path Selection Metric ID: 0x%02X",
3006 iwe
.u
.data
.length
= strlen(buf
);
3007 current_ev
= iwe_stream_add_point_check(info
,
3011 if (IS_ERR(current_ev
))
3013 sprintf(buf
, "Congestion Control Mode ID: 0x%02X",
3015 iwe
.u
.data
.length
= strlen(buf
);
3016 current_ev
= iwe_stream_add_point_check(info
,
3020 if (IS_ERR(current_ev
))
3022 sprintf(buf
, "Synchronization ID: 0x%02X", cfg
[3]);
3023 iwe
.u
.data
.length
= strlen(buf
);
3024 current_ev
= iwe_stream_add_point_check(info
,
3028 if (IS_ERR(current_ev
))
3030 sprintf(buf
, "Authentication ID: 0x%02X", cfg
[4]);
3031 iwe
.u
.data
.length
= strlen(buf
);
3032 current_ev
= iwe_stream_add_point_check(info
,
3036 if (IS_ERR(current_ev
))
3038 sprintf(buf
, "Formation Info: 0x%02X", cfg
[5]);
3039 iwe
.u
.data
.length
= strlen(buf
);
3040 current_ev
= iwe_stream_add_point_check(info
,
3044 if (IS_ERR(current_ev
))
3046 sprintf(buf
, "Capabilities: 0x%02X", cfg
[6]);
3047 iwe
.u
.data
.length
= strlen(buf
);
3048 current_ev
= iwe_stream_add_point_check(info
,
3052 if (IS_ERR(current_ev
))
3055 case WLAN_EID_SUPP_RATES
:
3056 case WLAN_EID_EXT_SUPP_RATES
:
3057 /* display all supported rates in readable format */
3058 p
= current_ev
+ iwe_stream_lcp_len(info
);
3060 memset(&iwe
, 0, sizeof(iwe
));
3061 iwe
.cmd
= SIOCGIWRATE
;
3062 /* Those two flags are ignored... */
3063 iwe
.u
.bitrate
.fixed
= iwe
.u
.bitrate
.disabled
= 0;
3065 for (i
= 0; i
< ie
[1]; i
++) {
3066 iwe
.u
.bitrate
.value
=
3067 ((ie
[i
+ 2] & 0x7f) * 500000);
3069 p
= iwe_stream_add_value(info
, current_ev
, p
,
3073 current_ev
= ERR_PTR(-E2BIG
);
3084 if (bss
->pub
.capability
& (WLAN_CAPABILITY_ESS
| WLAN_CAPABILITY_IBSS
) ||
3086 memset(&iwe
, 0, sizeof(iwe
));
3087 iwe
.cmd
= SIOCGIWMODE
;
3089 iwe
.u
.mode
= IW_MODE_MESH
;
3090 else if (bss
->pub
.capability
& WLAN_CAPABILITY_ESS
)
3091 iwe
.u
.mode
= IW_MODE_MASTER
;
3093 iwe
.u
.mode
= IW_MODE_ADHOC
;
3094 current_ev
= iwe_stream_add_event_check(info
, current_ev
,
3097 if (IS_ERR(current_ev
))
3101 memset(&iwe
, 0, sizeof(iwe
));
3102 iwe
.cmd
= IWEVCUSTOM
;
3103 sprintf(buf
, "tsf=%016llx", (unsigned long long)(ies
->tsf
));
3104 iwe
.u
.data
.length
= strlen(buf
);
3105 current_ev
= iwe_stream_add_point_check(info
, current_ev
, end_buf
,
3107 if (IS_ERR(current_ev
))
3109 memset(&iwe
, 0, sizeof(iwe
));
3110 iwe
.cmd
= IWEVCUSTOM
;
3111 sprintf(buf
, " Last beacon: %ums ago",
3112 elapsed_jiffies_msecs(bss
->ts
));
3113 iwe
.u
.data
.length
= strlen(buf
);
3114 current_ev
= iwe_stream_add_point_check(info
, current_ev
,
3115 end_buf
, &iwe
, buf
);
3116 if (IS_ERR(current_ev
))
3119 current_ev
= ieee80211_scan_add_ies(info
, ies
, current_ev
, end_buf
);
3127 static int ieee80211_scan_results(struct cfg80211_registered_device
*rdev
,
3128 struct iw_request_info
*info
,
3129 char *buf
, size_t len
)
3131 char *current_ev
= buf
;
3132 char *end_buf
= buf
+ len
;
3133 struct cfg80211_internal_bss
*bss
;
3136 spin_lock_bh(&rdev
->bss_lock
);
3137 cfg80211_bss_expire(rdev
);
3139 list_for_each_entry(bss
, &rdev
->bss_list
, list
) {
3140 if (buf
+ len
- current_ev
<= IW_EV_ADDR_LEN
) {
3144 current_ev
= ieee80211_bss(&rdev
->wiphy
, info
, bss
,
3145 current_ev
, end_buf
);
3146 if (IS_ERR(current_ev
)) {
3147 err
= PTR_ERR(current_ev
);
3151 spin_unlock_bh(&rdev
->bss_lock
);
3155 return current_ev
- buf
;
3159 int cfg80211_wext_giwscan(struct net_device
*dev
,
3160 struct iw_request_info
*info
,
3161 struct iw_point
*data
, char *extra
)
3163 struct cfg80211_registered_device
*rdev
;
3166 if (!netif_running(dev
))
3169 rdev
= cfg80211_get_dev_from_ifindex(dev_net(dev
), dev
->ifindex
);
3172 return PTR_ERR(rdev
);
3174 if (rdev
->scan_req
|| rdev
->scan_msg
)
3177 res
= ieee80211_scan_results(rdev
, info
, extra
, data
->length
);
3186 EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan
);