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) 2018-2020 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
);
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
))
429 /* add to the list */
430 list_add_tail(&nontrans_bss
->nontrans_list
, &trans_bss
->nontrans_list
);
434 static void __cfg80211_bss_expire(struct cfg80211_registered_device
*rdev
,
435 unsigned long expire_time
)
437 struct cfg80211_internal_bss
*bss
, *tmp
;
438 bool expired
= false;
440 lockdep_assert_held(&rdev
->bss_lock
);
442 list_for_each_entry_safe(bss
, tmp
, &rdev
->bss_list
, list
) {
443 if (atomic_read(&bss
->hold
))
445 if (!time_after(expire_time
, bss
->ts
))
448 if (__cfg80211_unlink_bss(rdev
, bss
))
453 rdev
->bss_generation
++;
456 static bool cfg80211_bss_expire_oldest(struct cfg80211_registered_device
*rdev
)
458 struct cfg80211_internal_bss
*bss
, *oldest
= NULL
;
461 lockdep_assert_held(&rdev
->bss_lock
);
463 list_for_each_entry(bss
, &rdev
->bss_list
, list
) {
464 if (atomic_read(&bss
->hold
))
467 if (!list_empty(&bss
->hidden_list
) &&
468 !bss
->pub
.hidden_beacon_bss
)
471 if (oldest
&& time_before(oldest
->ts
, bss
->ts
))
476 if (WARN_ON(!oldest
))
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
485 ret
= __cfg80211_unlink_bss(rdev
, oldest
);
490 static u8
cfg80211_parse_bss_param(u8 data
,
491 struct cfg80211_colocated_ap
*coloc_ap
)
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
);
506 return u8_get_bits(data
, IEEE80211_RNR_TBTT_PARAMS_COLOC_AP
);
509 static int cfg80211_calc_short_ssid(const struct cfg80211_bss_ies
*ies
,
510 const struct element
**elem
, u32
*s_ssid
)
513 *elem
= cfg80211_find_elem(WLAN_EID_SSID
, ies
->data
, ies
->len
);
514 if (!*elem
|| (*elem
)->datalen
> IEEE80211_MAX_SSID_LEN
)
517 *s_ssid
= ~crc32_le(~0, (*elem
)->data
, (*elem
)->datalen
);
521 static void cfg80211_free_coloc_ap_list(struct list_head
*coloc_ap_list
)
523 struct cfg80211_colocated_ap
*ap
, *tmp_ap
;
525 list_for_each_entry_safe(ap
, tmp_ap
, coloc_ap_list
, list
) {
531 static int cfg80211_parse_ap_info(struct cfg80211_colocated_ap
*entry
,
532 const u8
*pos
, u8 length
,
533 const struct element
*ssid_elem
,
536 /* skip the TBTT offset */
539 memcpy(entry
->bssid
, pos
, ETH_ALEN
);
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;
549 /* skip non colocated APs */
550 if (!cfg80211_parse_bss_param(*pos
, entry
))
554 if (length
== IEEE80211_TBTT_INFO_OFFSET_BSSID_BSS_PARAM
) {
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
560 if (!entry
->same_ssid
)
564 if (entry
->same_ssid
) {
565 entry
->short_ssid
= s_ssid_tmp
;
566 entry
->short_ssid_valid
= true;
569 * This is safe because we validate datalen in
570 * cfg80211_parse_colocated_ap(), before calling this
573 memcpy(&entry
->ssid
, &ssid_elem
->data
,
575 entry
->ssid_len
= ssid_elem
->datalen
;
580 static int cfg80211_parse_colocated_ap(const struct cfg80211_bss_ies
*ies
,
581 struct list_head
*list
)
583 struct ieee80211_neighbor_ap_info
*ap_info
;
584 const struct element
*elem
, *ssid_elem
;
587 int n_coloc
= 0, ret
;
590 elem
= cfg80211_find_elem(WLAN_EID_REDUCED_NEIGHBOR_REPORT
, ies
->data
,
596 end
= pos
+ elem
->datalen
;
598 ret
= cfg80211_calc_short_ssid(ies
, &ssid_elem
, &s_ssid_tmp
);
602 /* RNR IE may contain more than one NEIGHBOR_AP_INFO */
603 while (pos
+ sizeof(*ap_info
) <= end
) {
604 enum nl80211_band band
;
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
;
613 pos
+= sizeof(*ap_info
);
615 if (!ieee80211_operating_class_to_band(ap_info
->op_class
,
619 freq
= ieee80211_channel_to_frequency(ap_info
->channel
, band
);
621 if (end
- pos
< count
* ap_info
->tbtt_info_len
)
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
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
* ap_info
->tbtt_info_len
;
637 for (i
= 0; i
< count
; i
++) {
638 struct cfg80211_colocated_ap
*entry
;
640 entry
= kzalloc(sizeof(*entry
) + IEEE80211_MAX_SSID_LEN
,
646 entry
->center_freq
= freq
;
648 if (!cfg80211_parse_ap_info(entry
, pos
, length
,
649 ssid_elem
, s_ssid_tmp
)) {
651 list_add_tail(&entry
->list
, &ap_list
);
656 pos
+= ap_info
->tbtt_info_len
;
661 cfg80211_free_coloc_ap_list(&ap_list
);
665 list_splice_tail(&ap_list
, list
);
669 static void cfg80211_scan_req_add_chan(struct cfg80211_scan_request
*request
,
670 struct ieee80211_channel
*chan
,
674 u32 n_channels
= request
->n_channels
;
675 struct cfg80211_scan_6ghz_params
*params
=
676 &request
->scan_6ghz_params
[request
->n_6ghz_params
];
678 for (i
= 0; i
< n_channels
; i
++) {
679 if (request
->channels
[i
] == chan
) {
681 params
->channel_idx
= i
;
686 request
->channels
[n_channels
] = chan
;
688 request
->scan_6ghz_params
[request
->n_6ghz_params
].channel_idx
=
691 request
->n_channels
++;
694 static bool cfg80211_find_ssid_match(struct cfg80211_colocated_ap
*ap
,
695 struct cfg80211_scan_request
*request
)
700 for (i
= 0; i
< request
->n_ssids
; i
++) {
701 /* wildcard ssid in the scan request */
702 if (!request
->ssids
[i
].ssid_len
)
706 ap
->ssid_len
== request
->ssids
[i
].ssid_len
) {
707 if (!memcmp(request
->ssids
[i
].ssid
, ap
->ssid
,
710 } else if (ap
->short_ssid_valid
) {
711 s_ssid
= ~crc32_le(~0, request
->ssids
[i
].ssid
,
712 request
->ssids
[i
].ssid_len
);
714 if (ap
->short_ssid
== s_ssid
)
722 static int cfg80211_scan_6ghz(struct cfg80211_registered_device
*rdev
)
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
;
732 rdev_req
->scan_6ghz
= true;
734 if (!rdev
->wiphy
.bands
[NL80211_BAND_6GHZ
])
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
)
742 n_channels
= rdev
->wiphy
.bands
[NL80211_BAND_6GHZ
]->n_channels
;
744 if (rdev_req
->flags
& NL80211_SCAN_FLAG_COLOCATED_6GHZ
) {
745 struct cfg80211_internal_bss
*intbss
;
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
;
752 ies
= rcu_access_pointer(res
->ies
);
753 count
+= cfg80211_parse_colocated_ap(ies
,
756 spin_unlock_bh(&rdev
->bss_lock
);
759 request
= kzalloc(struct_size(request
, channels
, n_channels
) +
760 sizeof(*request
->scan_6ghz_params
) * count
,
763 cfg80211_free_coloc_ap_list(&coloc_ap_list
);
767 *request
= *rdev_req
;
768 request
->n_channels
= 0;
769 request
->scan_6ghz_params
=
770 (void *)&request
->channels
[n_channels
];
773 * PSC channels should not be scanned in case of direct scan with 1 SSID
774 * and at least one of the reported co-located APs with same SSID
775 * indicating that all APs in the same ESS are co-located
777 if (count
&& request
->n_ssids
== 1 && request
->ssids
[0].ssid_len
) {
778 list_for_each_entry(ap
, &coloc_ap_list
, list
) {
779 if (ap
->colocated_ess
&&
780 cfg80211_find_ssid_match(ap
, request
)) {
781 need_scan_psc
= false;
788 * add to the scan request the channels that need to be scanned
789 * regardless of the collocated APs (PSC channels or all channels
790 * in case that NL80211_SCAN_FLAG_COLOCATED_6GHZ is not set)
792 for (i
= 0; i
< rdev_req
->n_channels
; i
++) {
793 if (rdev_req
->channels
[i
]->band
== NL80211_BAND_6GHZ
&&
795 cfg80211_channel_is_psc(rdev_req
->channels
[i
])) ||
796 !(rdev_req
->flags
& NL80211_SCAN_FLAG_COLOCATED_6GHZ
))) {
797 cfg80211_scan_req_add_chan(request
,
798 rdev_req
->channels
[i
],
803 if (!(rdev_req
->flags
& NL80211_SCAN_FLAG_COLOCATED_6GHZ
))
806 list_for_each_entry(ap
, &coloc_ap_list
, list
) {
808 struct cfg80211_scan_6ghz_params
*scan_6ghz_params
=
809 &request
->scan_6ghz_params
[request
->n_6ghz_params
];
810 struct ieee80211_channel
*chan
=
811 ieee80211_get_channel(&rdev
->wiphy
, ap
->center_freq
);
813 if (!chan
|| chan
->flags
& IEEE80211_CHAN_DISABLED
)
816 for (i
= 0; i
< rdev_req
->n_channels
; i
++) {
817 if (rdev_req
->channels
[i
] == chan
)
824 if (request
->n_ssids
> 0 &&
825 !cfg80211_find_ssid_match(ap
, request
))
828 cfg80211_scan_req_add_chan(request
, chan
, true);
829 memcpy(scan_6ghz_params
->bssid
, ap
->bssid
, ETH_ALEN
);
830 scan_6ghz_params
->short_ssid
= ap
->short_ssid
;
831 scan_6ghz_params
->short_ssid_valid
= ap
->short_ssid_valid
;
832 scan_6ghz_params
->unsolicited_probe
= ap
->unsolicited_probe
;
835 * If a PSC channel is added to the scan and 'need_scan_psc' is
836 * set to false, then all the APs that the scan logic is
837 * interested with on the channel are collocated and thus there
838 * is no need to perform the initial PSC channel listen.
840 if (cfg80211_channel_is_psc(chan
) && !need_scan_psc
)
841 scan_6ghz_params
->psc_no_listen
= true;
843 request
->n_6ghz_params
++;
847 cfg80211_free_coloc_ap_list(&coloc_ap_list
);
849 if (request
->n_channels
) {
850 struct cfg80211_scan_request
*old
= rdev
->int_scan_req
;
852 rdev
->int_scan_req
= request
;
855 * If this scan follows a previous scan, save the scan start
856 * info from the first part of the scan
859 rdev
->int_scan_req
->info
= old
->info
;
861 err
= rdev_scan(rdev
, request
);
863 rdev
->int_scan_req
= old
;
876 int cfg80211_scan(struct cfg80211_registered_device
*rdev
)
878 struct cfg80211_scan_request
*request
;
879 struct cfg80211_scan_request
*rdev_req
= rdev
->scan_req
;
880 u32 n_channels
= 0, idx
, i
;
882 if (!(rdev
->wiphy
.flags
& WIPHY_FLAG_SPLIT_SCAN_6GHZ
))
883 return rdev_scan(rdev
, rdev_req
);
885 for (i
= 0; i
< rdev_req
->n_channels
; i
++) {
886 if (rdev_req
->channels
[i
]->band
!= NL80211_BAND_6GHZ
)
891 return cfg80211_scan_6ghz(rdev
);
893 request
= kzalloc(struct_size(request
, channels
, n_channels
),
898 *request
= *rdev_req
;
899 request
->n_channels
= n_channels
;
901 for (i
= idx
= 0; i
< rdev_req
->n_channels
; i
++) {
902 if (rdev_req
->channels
[i
]->band
!= NL80211_BAND_6GHZ
)
903 request
->channels
[idx
++] = rdev_req
->channels
[i
];
906 rdev_req
->scan_6ghz
= false;
907 rdev
->int_scan_req
= request
;
908 return rdev_scan(rdev
, request
);
911 void ___cfg80211_scan_done(struct cfg80211_registered_device
*rdev
,
914 struct cfg80211_scan_request
*request
, *rdev_req
;
915 struct wireless_dev
*wdev
;
917 #ifdef CONFIG_CFG80211_WEXT
918 union iwreq_data wrqu
;
921 lockdep_assert_held(&rdev
->wiphy
.mtx
);
923 if (rdev
->scan_msg
) {
924 nl80211_send_scan_msg(rdev
, rdev
->scan_msg
);
925 rdev
->scan_msg
= NULL
;
929 rdev_req
= rdev
->scan_req
;
933 wdev
= rdev_req
->wdev
;
934 request
= rdev
->int_scan_req
? rdev
->int_scan_req
: rdev_req
;
936 if (wdev_running(wdev
) &&
937 (rdev
->wiphy
.flags
& WIPHY_FLAG_SPLIT_SCAN_6GHZ
) &&
938 !rdev_req
->scan_6ghz
&& !request
->info
.aborted
&&
939 !cfg80211_scan_6ghz(rdev
))
943 * This must be before sending the other events!
944 * Otherwise, wpa_supplicant gets completely confused with
948 cfg80211_sme_scan_done(wdev
->netdev
);
950 if (!request
->info
.aborted
&&
951 request
->flags
& NL80211_SCAN_FLAG_FLUSH
) {
952 /* flush entries from previous scans */
953 spin_lock_bh(&rdev
->bss_lock
);
954 __cfg80211_bss_expire(rdev
, request
->scan_start
);
955 spin_unlock_bh(&rdev
->bss_lock
);
958 msg
= nl80211_build_scan_msg(rdev
, wdev
, request
->info
.aborted
);
960 #ifdef CONFIG_CFG80211_WEXT
961 if (wdev
->netdev
&& !request
->info
.aborted
) {
962 memset(&wrqu
, 0, sizeof(wrqu
));
964 wireless_send_event(wdev
->netdev
, SIOCGIWSCAN
, &wrqu
, NULL
);
969 dev_put(wdev
->netdev
);
971 kfree(rdev
->int_scan_req
);
972 rdev
->int_scan_req
= NULL
;
974 kfree(rdev
->scan_req
);
975 rdev
->scan_req
= NULL
;
978 rdev
->scan_msg
= msg
;
980 nl80211_send_scan_msg(rdev
, msg
);
983 void __cfg80211_scan_done(struct work_struct
*wk
)
985 struct cfg80211_registered_device
*rdev
;
987 rdev
= container_of(wk
, struct cfg80211_registered_device
,
990 wiphy_lock(&rdev
->wiphy
);
991 ___cfg80211_scan_done(rdev
, true);
992 wiphy_unlock(&rdev
->wiphy
);
995 void cfg80211_scan_done(struct cfg80211_scan_request
*request
,
996 struct cfg80211_scan_info
*info
)
998 struct cfg80211_scan_info old_info
= request
->info
;
1000 trace_cfg80211_scan_done(request
, info
);
1001 WARN_ON(request
!= wiphy_to_rdev(request
->wiphy
)->scan_req
&&
1002 request
!= wiphy_to_rdev(request
->wiphy
)->int_scan_req
);
1004 request
->info
= *info
;
1007 * In case the scan is split, the scan_start_tsf and tsf_bssid should
1008 * be of the first part. In such a case old_info.scan_start_tsf should
1011 if (request
->scan_6ghz
&& old_info
.scan_start_tsf
) {
1012 request
->info
.scan_start_tsf
= old_info
.scan_start_tsf
;
1013 memcpy(request
->info
.tsf_bssid
, old_info
.tsf_bssid
,
1014 sizeof(request
->info
.tsf_bssid
));
1017 request
->notified
= true;
1018 queue_work(cfg80211_wq
, &wiphy_to_rdev(request
->wiphy
)->scan_done_wk
);
1020 EXPORT_SYMBOL(cfg80211_scan_done
);
1022 void cfg80211_add_sched_scan_req(struct cfg80211_registered_device
*rdev
,
1023 struct cfg80211_sched_scan_request
*req
)
1025 lockdep_assert_held(&rdev
->wiphy
.mtx
);
1027 list_add_rcu(&req
->list
, &rdev
->sched_scan_req_list
);
1030 static void cfg80211_del_sched_scan_req(struct cfg80211_registered_device
*rdev
,
1031 struct cfg80211_sched_scan_request
*req
)
1033 lockdep_assert_held(&rdev
->wiphy
.mtx
);
1035 list_del_rcu(&req
->list
);
1036 kfree_rcu(req
, rcu_head
);
1039 static struct cfg80211_sched_scan_request
*
1040 cfg80211_find_sched_scan_req(struct cfg80211_registered_device
*rdev
, u64 reqid
)
1042 struct cfg80211_sched_scan_request
*pos
;
1044 list_for_each_entry_rcu(pos
, &rdev
->sched_scan_req_list
, list
,
1045 lockdep_is_held(&rdev
->wiphy
.mtx
)) {
1046 if (pos
->reqid
== reqid
)
1053 * Determines if a scheduled scan request can be handled. When a legacy
1054 * scheduled scan is running no other scheduled scan is allowed regardless
1055 * whether the request is for legacy or multi-support scan. When a multi-support
1056 * scheduled scan is running a request for legacy scan is not allowed. In this
1057 * case a request for multi-support scan can be handled if resources are
1058 * available, ie. struct wiphy::max_sched_scan_reqs limit is not yet reached.
1060 int cfg80211_sched_scan_req_possible(struct cfg80211_registered_device
*rdev
,
1063 struct cfg80211_sched_scan_request
*pos
;
1066 list_for_each_entry(pos
, &rdev
->sched_scan_req_list
, list
) {
1067 /* request id zero means legacy in progress */
1068 if (!i
&& !pos
->reqid
)
1069 return -EINPROGRESS
;
1074 /* no legacy allowed when multi request(s) are active */
1076 return -EINPROGRESS
;
1078 /* resource limit reached */
1079 if (i
== rdev
->wiphy
.max_sched_scan_reqs
)
1085 void cfg80211_sched_scan_results_wk(struct work_struct
*work
)
1087 struct cfg80211_registered_device
*rdev
;
1088 struct cfg80211_sched_scan_request
*req
, *tmp
;
1090 rdev
= container_of(work
, struct cfg80211_registered_device
,
1093 wiphy_lock(&rdev
->wiphy
);
1094 list_for_each_entry_safe(req
, tmp
, &rdev
->sched_scan_req_list
, list
) {
1095 if (req
->report_results
) {
1096 req
->report_results
= false;
1097 if (req
->flags
& NL80211_SCAN_FLAG_FLUSH
) {
1098 /* flush entries from previous scans */
1099 spin_lock_bh(&rdev
->bss_lock
);
1100 __cfg80211_bss_expire(rdev
, req
->scan_start
);
1101 spin_unlock_bh(&rdev
->bss_lock
);
1102 req
->scan_start
= jiffies
;
1104 nl80211_send_sched_scan(req
,
1105 NL80211_CMD_SCHED_SCAN_RESULTS
);
1108 wiphy_unlock(&rdev
->wiphy
);
1111 void cfg80211_sched_scan_results(struct wiphy
*wiphy
, u64 reqid
)
1113 struct cfg80211_registered_device
*rdev
= wiphy_to_rdev(wiphy
);
1114 struct cfg80211_sched_scan_request
*request
;
1116 trace_cfg80211_sched_scan_results(wiphy
, reqid
);
1117 /* ignore if we're not scanning */
1120 request
= cfg80211_find_sched_scan_req(rdev
, reqid
);
1122 request
->report_results
= true;
1123 queue_work(cfg80211_wq
, &rdev
->sched_scan_res_wk
);
1127 EXPORT_SYMBOL(cfg80211_sched_scan_results
);
1129 void cfg80211_sched_scan_stopped_locked(struct wiphy
*wiphy
, u64 reqid
)
1131 struct cfg80211_registered_device
*rdev
= wiphy_to_rdev(wiphy
);
1133 lockdep_assert_held(&wiphy
->mtx
);
1135 trace_cfg80211_sched_scan_stopped(wiphy
, reqid
);
1137 __cfg80211_stop_sched_scan(rdev
, reqid
, true);
1139 EXPORT_SYMBOL(cfg80211_sched_scan_stopped_locked
);
1141 void cfg80211_sched_scan_stopped(struct wiphy
*wiphy
, u64 reqid
)
1144 cfg80211_sched_scan_stopped_locked(wiphy
, reqid
);
1145 wiphy_unlock(wiphy
);
1147 EXPORT_SYMBOL(cfg80211_sched_scan_stopped
);
1149 int cfg80211_stop_sched_scan_req(struct cfg80211_registered_device
*rdev
,
1150 struct cfg80211_sched_scan_request
*req
,
1151 bool driver_initiated
)
1153 lockdep_assert_held(&rdev
->wiphy
.mtx
);
1155 if (!driver_initiated
) {
1156 int err
= rdev_sched_scan_stop(rdev
, req
->dev
, req
->reqid
);
1161 nl80211_send_sched_scan(req
, NL80211_CMD_SCHED_SCAN_STOPPED
);
1163 cfg80211_del_sched_scan_req(rdev
, req
);
1168 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device
*rdev
,
1169 u64 reqid
, bool driver_initiated
)
1171 struct cfg80211_sched_scan_request
*sched_scan_req
;
1173 lockdep_assert_held(&rdev
->wiphy
.mtx
);
1175 sched_scan_req
= cfg80211_find_sched_scan_req(rdev
, reqid
);
1176 if (!sched_scan_req
)
1179 return cfg80211_stop_sched_scan_req(rdev
, sched_scan_req
,
1183 void cfg80211_bss_age(struct cfg80211_registered_device
*rdev
,
1184 unsigned long age_secs
)
1186 struct cfg80211_internal_bss
*bss
;
1187 unsigned long age_jiffies
= msecs_to_jiffies(age_secs
* MSEC_PER_SEC
);
1189 spin_lock_bh(&rdev
->bss_lock
);
1190 list_for_each_entry(bss
, &rdev
->bss_list
, list
)
1191 bss
->ts
-= age_jiffies
;
1192 spin_unlock_bh(&rdev
->bss_lock
);
1195 void cfg80211_bss_expire(struct cfg80211_registered_device
*rdev
)
1197 __cfg80211_bss_expire(rdev
, jiffies
- IEEE80211_SCAN_RESULT_EXPIRE
);
1200 void cfg80211_bss_flush(struct wiphy
*wiphy
)
1202 struct cfg80211_registered_device
*rdev
= wiphy_to_rdev(wiphy
);
1204 spin_lock_bh(&rdev
->bss_lock
);
1205 __cfg80211_bss_expire(rdev
, jiffies
);
1206 spin_unlock_bh(&rdev
->bss_lock
);
1208 EXPORT_SYMBOL(cfg80211_bss_flush
);
1210 const struct element
*
1211 cfg80211_find_elem_match(u8 eid
, const u8
*ies
, unsigned int len
,
1212 const u8
*match
, unsigned int match_len
,
1213 unsigned int match_offset
)
1215 const struct element
*elem
;
1217 for_each_element_id(elem
, eid
, ies
, len
) {
1218 if (elem
->datalen
>= match_offset
+ match_len
&&
1219 !memcmp(elem
->data
+ match_offset
, match
, match_len
))
1225 EXPORT_SYMBOL(cfg80211_find_elem_match
);
1227 const struct element
*cfg80211_find_vendor_elem(unsigned int oui
, int oui_type
,
1231 const struct element
*elem
;
1232 u8 match
[] = { oui
>> 16, oui
>> 8, oui
, oui_type
};
1233 int match_len
= (oui_type
< 0) ? 3 : sizeof(match
);
1235 if (WARN_ON(oui_type
> 0xff))
1238 elem
= cfg80211_find_elem_match(WLAN_EID_VENDOR_SPECIFIC
, ies
, len
,
1239 match
, match_len
, 0);
1241 if (!elem
|| elem
->datalen
< 4)
1246 EXPORT_SYMBOL(cfg80211_find_vendor_elem
);
1249 * enum bss_compare_mode - BSS compare mode
1250 * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find)
1251 * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode
1252 * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode
1254 enum bss_compare_mode
{
1260 static int cmp_bss(struct cfg80211_bss
*a
,
1261 struct cfg80211_bss
*b
,
1262 enum bss_compare_mode mode
)
1264 const struct cfg80211_bss_ies
*a_ies
, *b_ies
;
1265 const u8
*ie1
= NULL
;
1266 const u8
*ie2
= NULL
;
1269 if (a
->channel
!= b
->channel
)
1270 return b
->channel
->center_freq
- a
->channel
->center_freq
;
1272 a_ies
= rcu_access_pointer(a
->ies
);
1275 b_ies
= rcu_access_pointer(b
->ies
);
1279 if (WLAN_CAPABILITY_IS_STA_BSS(a
->capability
))
1280 ie1
= cfg80211_find_ie(WLAN_EID_MESH_ID
,
1281 a_ies
->data
, a_ies
->len
);
1282 if (WLAN_CAPABILITY_IS_STA_BSS(b
->capability
))
1283 ie2
= cfg80211_find_ie(WLAN_EID_MESH_ID
,
1284 b_ies
->data
, b_ies
->len
);
1288 if (ie1
[1] == ie2
[1])
1289 mesh_id_cmp
= memcmp(ie1
+ 2, ie2
+ 2, ie1
[1]);
1291 mesh_id_cmp
= ie2
[1] - ie1
[1];
1293 ie1
= cfg80211_find_ie(WLAN_EID_MESH_CONFIG
,
1294 a_ies
->data
, a_ies
->len
);
1295 ie2
= cfg80211_find_ie(WLAN_EID_MESH_CONFIG
,
1296 b_ies
->data
, b_ies
->len
);
1300 if (ie1
[1] != ie2
[1])
1301 return ie2
[1] - ie1
[1];
1302 return memcmp(ie1
+ 2, ie2
+ 2, ie1
[1]);
1306 r
= memcmp(a
->bssid
, b
->bssid
, sizeof(a
->bssid
));
1310 ie1
= cfg80211_find_ie(WLAN_EID_SSID
, a_ies
->data
, a_ies
->len
);
1311 ie2
= cfg80211_find_ie(WLAN_EID_SSID
, b_ies
->data
, b_ies
->len
);
1317 * Note that with "hide_ssid", the function returns a match if
1318 * the already-present BSS ("b") is a hidden SSID beacon for
1319 * the new BSS ("a").
1322 /* sort missing IE before (left of) present IE */
1329 case BSS_CMP_HIDE_ZLEN
:
1331 * In ZLEN mode we assume the BSS entry we're
1332 * looking for has a zero-length SSID. So if
1333 * the one we're looking at right now has that,
1334 * return 0. Otherwise, return the difference
1335 * in length, but since we're looking for the
1336 * 0-length it's really equivalent to returning
1337 * the length of the one we're looking at.
1339 * No content comparison is needed as we assume
1340 * the content length is zero.
1343 case BSS_CMP_REGULAR
:
1345 /* sort by length first, then by contents */
1346 if (ie1
[1] != ie2
[1])
1347 return ie2
[1] - ie1
[1];
1348 return memcmp(ie1
+ 2, ie2
+ 2, ie1
[1]);
1349 case BSS_CMP_HIDE_NUL
:
1350 if (ie1
[1] != ie2
[1])
1351 return ie2
[1] - ie1
[1];
1352 /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */
1353 for (i
= 0; i
< ie2
[1]; i
++)
1360 static bool cfg80211_bss_type_match(u16 capability
,
1361 enum nl80211_band band
,
1362 enum ieee80211_bss_type bss_type
)
1367 if (bss_type
== IEEE80211_BSS_TYPE_ANY
)
1370 if (band
== NL80211_BAND_60GHZ
) {
1371 mask
= WLAN_CAPABILITY_DMG_TYPE_MASK
;
1373 case IEEE80211_BSS_TYPE_ESS
:
1374 val
= WLAN_CAPABILITY_DMG_TYPE_AP
;
1376 case IEEE80211_BSS_TYPE_PBSS
:
1377 val
= WLAN_CAPABILITY_DMG_TYPE_PBSS
;
1379 case IEEE80211_BSS_TYPE_IBSS
:
1380 val
= WLAN_CAPABILITY_DMG_TYPE_IBSS
;
1386 mask
= WLAN_CAPABILITY_ESS
| WLAN_CAPABILITY_IBSS
;
1388 case IEEE80211_BSS_TYPE_ESS
:
1389 val
= WLAN_CAPABILITY_ESS
;
1391 case IEEE80211_BSS_TYPE_IBSS
:
1392 val
= WLAN_CAPABILITY_IBSS
;
1394 case IEEE80211_BSS_TYPE_MBSS
:
1402 ret
= ((capability
& mask
) == val
);
1406 /* Returned bss is reference counted and must be cleaned up appropriately. */
1407 struct cfg80211_bss
*cfg80211_get_bss(struct wiphy
*wiphy
,
1408 struct ieee80211_channel
*channel
,
1410 const u8
*ssid
, size_t ssid_len
,
1411 enum ieee80211_bss_type bss_type
,
1412 enum ieee80211_privacy privacy
)
1414 struct cfg80211_registered_device
*rdev
= wiphy_to_rdev(wiphy
);
1415 struct cfg80211_internal_bss
*bss
, *res
= NULL
;
1416 unsigned long now
= jiffies
;
1419 trace_cfg80211_get_bss(wiphy
, channel
, bssid
, ssid
, ssid_len
, bss_type
,
1422 spin_lock_bh(&rdev
->bss_lock
);
1424 list_for_each_entry(bss
, &rdev
->bss_list
, list
) {
1425 if (!cfg80211_bss_type_match(bss
->pub
.capability
,
1426 bss
->pub
.channel
->band
, bss_type
))
1429 bss_privacy
= (bss
->pub
.capability
& WLAN_CAPABILITY_PRIVACY
);
1430 if ((privacy
== IEEE80211_PRIVACY_ON
&& !bss_privacy
) ||
1431 (privacy
== IEEE80211_PRIVACY_OFF
&& bss_privacy
))
1433 if (channel
&& bss
->pub
.channel
!= channel
)
1435 if (!is_valid_ether_addr(bss
->pub
.bssid
))
1437 /* Don't get expired BSS structs */
1438 if (time_after(now
, bss
->ts
+ IEEE80211_SCAN_RESULT_EXPIRE
) &&
1439 !atomic_read(&bss
->hold
))
1441 if (is_bss(&bss
->pub
, bssid
, ssid
, ssid_len
)) {
1443 bss_ref_get(rdev
, res
);
1448 spin_unlock_bh(&rdev
->bss_lock
);
1451 trace_cfg80211_return_bss(&res
->pub
);
1454 EXPORT_SYMBOL(cfg80211_get_bss
);
1456 static void rb_insert_bss(struct cfg80211_registered_device
*rdev
,
1457 struct cfg80211_internal_bss
*bss
)
1459 struct rb_node
**p
= &rdev
->bss_tree
.rb_node
;
1460 struct rb_node
*parent
= NULL
;
1461 struct cfg80211_internal_bss
*tbss
;
1466 tbss
= rb_entry(parent
, struct cfg80211_internal_bss
, rbn
);
1468 cmp
= cmp_bss(&bss
->pub
, &tbss
->pub
, BSS_CMP_REGULAR
);
1470 if (WARN_ON(!cmp
)) {
1471 /* will sort of leak this BSS */
1478 p
= &(*p
)->rb_right
;
1481 rb_link_node(&bss
->rbn
, parent
, p
);
1482 rb_insert_color(&bss
->rbn
, &rdev
->bss_tree
);
1485 static struct cfg80211_internal_bss
*
1486 rb_find_bss(struct cfg80211_registered_device
*rdev
,
1487 struct cfg80211_internal_bss
*res
,
1488 enum bss_compare_mode mode
)
1490 struct rb_node
*n
= rdev
->bss_tree
.rb_node
;
1491 struct cfg80211_internal_bss
*bss
;
1495 bss
= rb_entry(n
, struct cfg80211_internal_bss
, rbn
);
1496 r
= cmp_bss(&res
->pub
, &bss
->pub
, mode
);
1509 static bool cfg80211_combine_bsses(struct cfg80211_registered_device
*rdev
,
1510 struct cfg80211_internal_bss
*new)
1512 const struct cfg80211_bss_ies
*ies
;
1513 struct cfg80211_internal_bss
*bss
;
1519 ies
= rcu_access_pointer(new->pub
.beacon_ies
);
1523 ie
= cfg80211_find_ie(WLAN_EID_SSID
, ies
->data
, ies
->len
);
1530 for (i
= 0; i
< ssidlen
; i
++)
1534 /* not a hidden SSID */
1538 /* This is the bad part ... */
1540 list_for_each_entry(bss
, &rdev
->bss_list
, list
) {
1542 * we're iterating all the entries anyway, so take the
1543 * opportunity to validate the list length accounting
1547 if (!ether_addr_equal(bss
->pub
.bssid
, new->pub
.bssid
))
1549 if (bss
->pub
.channel
!= new->pub
.channel
)
1551 if (bss
->pub
.scan_width
!= new->pub
.scan_width
)
1553 if (rcu_access_pointer(bss
->pub
.beacon_ies
))
1555 ies
= rcu_access_pointer(bss
->pub
.ies
);
1558 ie
= cfg80211_find_ie(WLAN_EID_SSID
, ies
->data
, ies
->len
);
1561 if (ssidlen
&& ie
[1] != ssidlen
)
1563 if (WARN_ON_ONCE(bss
->pub
.hidden_beacon_bss
))
1565 if (WARN_ON_ONCE(!list_empty(&bss
->hidden_list
)))
1566 list_del(&bss
->hidden_list
);
1568 list_add(&bss
->hidden_list
, &new->hidden_list
);
1569 bss
->pub
.hidden_beacon_bss
= &new->pub
;
1570 new->refcount
+= bss
->refcount
;
1571 rcu_assign_pointer(bss
->pub
.beacon_ies
,
1572 new->pub
.beacon_ies
);
1575 WARN_ONCE(n_entries
!= rdev
->bss_entries
,
1576 "rdev bss entries[%d]/list[len:%d] corruption\n",
1577 rdev
->bss_entries
, n_entries
);
1582 struct cfg80211_non_tx_bss
{
1583 struct cfg80211_bss
*tx_bss
;
1584 u8 max_bssid_indicator
;
1589 cfg80211_update_known_bss(struct cfg80211_registered_device
*rdev
,
1590 struct cfg80211_internal_bss
*known
,
1591 struct cfg80211_internal_bss
*new,
1594 lockdep_assert_held(&rdev
->bss_lock
);
1597 if (rcu_access_pointer(new->pub
.proberesp_ies
)) {
1598 const struct cfg80211_bss_ies
*old
;
1600 old
= rcu_access_pointer(known
->pub
.proberesp_ies
);
1602 rcu_assign_pointer(known
->pub
.proberesp_ies
,
1603 new->pub
.proberesp_ies
);
1604 /* Override possible earlier Beacon frame IEs */
1605 rcu_assign_pointer(known
->pub
.ies
,
1606 new->pub
.proberesp_ies
);
1608 kfree_rcu((struct cfg80211_bss_ies
*)old
, rcu_head
);
1609 } else if (rcu_access_pointer(new->pub
.beacon_ies
)) {
1610 const struct cfg80211_bss_ies
*old
;
1611 struct cfg80211_internal_bss
*bss
;
1613 if (known
->pub
.hidden_beacon_bss
&&
1614 !list_empty(&known
->hidden_list
)) {
1615 const struct cfg80211_bss_ies
*f
;
1617 /* The known BSS struct is one of the probe
1618 * response members of a group, but we're
1619 * receiving a beacon (beacon_ies in the new
1620 * bss is used). This can only mean that the
1621 * AP changed its beacon from not having an
1622 * SSID to showing it, which is confusing so
1623 * drop this information.
1626 f
= rcu_access_pointer(new->pub
.beacon_ies
);
1627 kfree_rcu((struct cfg80211_bss_ies
*)f
, rcu_head
);
1631 old
= rcu_access_pointer(known
->pub
.beacon_ies
);
1633 rcu_assign_pointer(known
->pub
.beacon_ies
, new->pub
.beacon_ies
);
1635 /* Override IEs if they were from a beacon before */
1636 if (old
== rcu_access_pointer(known
->pub
.ies
))
1637 rcu_assign_pointer(known
->pub
.ies
, new->pub
.beacon_ies
);
1639 /* Assign beacon IEs to all sub entries */
1640 list_for_each_entry(bss
, &known
->hidden_list
, hidden_list
) {
1641 const struct cfg80211_bss_ies
*ies
;
1643 ies
= rcu_access_pointer(bss
->pub
.beacon_ies
);
1644 WARN_ON(ies
!= old
);
1646 rcu_assign_pointer(bss
->pub
.beacon_ies
,
1647 new->pub
.beacon_ies
);
1651 kfree_rcu((struct cfg80211_bss_ies
*)old
, rcu_head
);
1654 known
->pub
.beacon_interval
= new->pub
.beacon_interval
;
1656 /* don't update the signal if beacon was heard on
1660 known
->pub
.signal
= new->pub
.signal
;
1661 known
->pub
.capability
= new->pub
.capability
;
1662 known
->ts
= new->ts
;
1663 known
->ts_boottime
= new->ts_boottime
;
1664 known
->parent_tsf
= new->parent_tsf
;
1665 known
->pub
.chains
= new->pub
.chains
;
1666 memcpy(known
->pub
.chain_signal
, new->pub
.chain_signal
,
1667 IEEE80211_MAX_CHAINS
);
1668 ether_addr_copy(known
->parent_bssid
, new->parent_bssid
);
1669 known
->pub
.max_bssid_indicator
= new->pub
.max_bssid_indicator
;
1670 known
->pub
.bssid_index
= new->pub
.bssid_index
;
1675 /* Returned bss is reference counted and must be cleaned up appropriately. */
1676 struct cfg80211_internal_bss
*
1677 cfg80211_bss_update(struct cfg80211_registered_device
*rdev
,
1678 struct cfg80211_internal_bss
*tmp
,
1679 bool signal_valid
, unsigned long ts
)
1681 struct cfg80211_internal_bss
*found
= NULL
;
1683 if (WARN_ON(!tmp
->pub
.channel
))
1688 spin_lock_bh(&rdev
->bss_lock
);
1690 if (WARN_ON(!rcu_access_pointer(tmp
->pub
.ies
))) {
1691 spin_unlock_bh(&rdev
->bss_lock
);
1695 found
= rb_find_bss(rdev
, tmp
, BSS_CMP_REGULAR
);
1698 if (!cfg80211_update_known_bss(rdev
, found
, tmp
, signal_valid
))
1701 struct cfg80211_internal_bss
*new;
1702 struct cfg80211_internal_bss
*hidden
;
1703 struct cfg80211_bss_ies
*ies
;
1706 * create a copy -- the "res" variable that is passed in
1707 * is allocated on the stack since it's not needed in the
1708 * more common case of an update
1710 new = kzalloc(sizeof(*new) + rdev
->wiphy
.bss_priv_size
,
1713 ies
= (void *)rcu_dereference(tmp
->pub
.beacon_ies
);
1715 kfree_rcu(ies
, rcu_head
);
1716 ies
= (void *)rcu_dereference(tmp
->pub
.proberesp_ies
);
1718 kfree_rcu(ies
, rcu_head
);
1721 memcpy(new, tmp
, sizeof(*new));
1723 INIT_LIST_HEAD(&new->hidden_list
);
1724 INIT_LIST_HEAD(&new->pub
.nontrans_list
);
1726 if (rcu_access_pointer(tmp
->pub
.proberesp_ies
)) {
1727 hidden
= rb_find_bss(rdev
, tmp
, BSS_CMP_HIDE_ZLEN
);
1729 hidden
= rb_find_bss(rdev
, tmp
,
1732 new->pub
.hidden_beacon_bss
= &hidden
->pub
;
1733 list_add(&new->hidden_list
,
1734 &hidden
->hidden_list
);
1736 rcu_assign_pointer(new->pub
.beacon_ies
,
1737 hidden
->pub
.beacon_ies
);
1741 * Ok so we found a beacon, and don't have an entry. If
1742 * it's a beacon with hidden SSID, we might be in for an
1743 * expensive search for any probe responses that should
1744 * be grouped with this beacon for updates ...
1746 if (!cfg80211_combine_bsses(rdev
, new)) {
1752 if (rdev
->bss_entries
>= bss_entries_limit
&&
1753 !cfg80211_bss_expire_oldest(rdev
)) {
1754 if (!list_empty(&new->hidden_list
))
1755 list_del(&new->hidden_list
);
1760 /* This must be before the call to bss_ref_get */
1761 if (tmp
->pub
.transmitted_bss
) {
1762 struct cfg80211_internal_bss
*pbss
=
1763 container_of(tmp
->pub
.transmitted_bss
,
1764 struct cfg80211_internal_bss
,
1767 new->pub
.transmitted_bss
= tmp
->pub
.transmitted_bss
;
1768 bss_ref_get(rdev
, pbss
);
1771 list_add_tail(&new->list
, &rdev
->bss_list
);
1772 rdev
->bss_entries
++;
1773 rb_insert_bss(rdev
, new);
1777 rdev
->bss_generation
++;
1778 bss_ref_get(rdev
, found
);
1779 spin_unlock_bh(&rdev
->bss_lock
);
1783 spin_unlock_bh(&rdev
->bss_lock
);
1788 * Update RX channel information based on the available frame payload
1789 * information. This is mainly for the 2.4 GHz band where frames can be received
1790 * from neighboring channels and the Beacon frames use the DSSS Parameter Set
1791 * element to indicate the current (transmitting) channel, but this might also
1792 * be needed on other bands if RX frequency does not match with the actual
1793 * operating channel of a BSS.
1795 static struct ieee80211_channel
*
1796 cfg80211_get_bss_channel(struct wiphy
*wiphy
, const u8
*ie
, size_t ielen
,
1797 struct ieee80211_channel
*channel
,
1798 enum nl80211_bss_scan_width scan_width
)
1802 int channel_number
= -1;
1803 struct ieee80211_channel
*alt_channel
;
1805 if (channel
->band
== NL80211_BAND_S1GHZ
) {
1806 tmp
= cfg80211_find_ie(WLAN_EID_S1G_OPERATION
, ie
, ielen
);
1807 if (tmp
&& tmp
[1] >= sizeof(struct ieee80211_s1g_oper_ie
)) {
1808 struct ieee80211_s1g_oper_ie
*s1gop
= (void *)(tmp
+ 2);
1810 channel_number
= s1gop
->primary_ch
;
1813 tmp
= cfg80211_find_ie(WLAN_EID_DS_PARAMS
, ie
, ielen
);
1814 if (tmp
&& tmp
[1] == 1) {
1815 channel_number
= tmp
[2];
1817 tmp
= cfg80211_find_ie(WLAN_EID_HT_OPERATION
, ie
, ielen
);
1818 if (tmp
&& tmp
[1] >= sizeof(struct ieee80211_ht_operation
)) {
1819 struct ieee80211_ht_operation
*htop
= (void *)(tmp
+ 2);
1821 channel_number
= htop
->primary_chan
;
1826 if (channel_number
< 0) {
1827 /* No channel information in frame payload */
1831 freq
= ieee80211_channel_to_freq_khz(channel_number
, channel
->band
);
1832 alt_channel
= ieee80211_get_channel_khz(wiphy
, freq
);
1834 if (channel
->band
== NL80211_BAND_2GHZ
) {
1836 * Better not allow unexpected channels when that could
1837 * be going beyond the 1-11 range (e.g., discovering
1838 * BSS on channel 12 when radio is configured for
1844 /* No match for the payload channel number - ignore it */
1848 if (scan_width
== NL80211_BSS_CHAN_WIDTH_10
||
1849 scan_width
== NL80211_BSS_CHAN_WIDTH_5
) {
1851 * Ignore channel number in 5 and 10 MHz channels where there
1852 * may not be an n:1 or 1:n mapping between frequencies and
1859 * Use the channel determined through the payload channel number
1860 * instead of the RX channel reported by the driver.
1862 if (alt_channel
->flags
& IEEE80211_CHAN_DISABLED
)
1867 /* Returned bss is reference counted and must be cleaned up appropriately. */
1868 static struct cfg80211_bss
*
1869 cfg80211_inform_single_bss_data(struct wiphy
*wiphy
,
1870 struct cfg80211_inform_bss
*data
,
1871 enum cfg80211_bss_frame_type ftype
,
1872 const u8
*bssid
, u64 tsf
, u16 capability
,
1873 u16 beacon_interval
, const u8
*ie
, size_t ielen
,
1874 struct cfg80211_non_tx_bss
*non_tx_data
,
1877 struct cfg80211_registered_device
*rdev
= wiphy_to_rdev(wiphy
);
1878 struct cfg80211_bss_ies
*ies
;
1879 struct ieee80211_channel
*channel
;
1880 struct cfg80211_internal_bss tmp
= {}, *res
;
1885 if (WARN_ON(!wiphy
))
1888 if (WARN_ON(wiphy
->signal_type
== CFG80211_SIGNAL_TYPE_UNSPEC
&&
1889 (data
->signal
< 0 || data
->signal
> 100)))
1892 channel
= cfg80211_get_bss_channel(wiphy
, ie
, ielen
, data
->chan
,
1897 memcpy(tmp
.pub
.bssid
, bssid
, ETH_ALEN
);
1898 tmp
.pub
.channel
= channel
;
1899 tmp
.pub
.scan_width
= data
->scan_width
;
1900 tmp
.pub
.signal
= data
->signal
;
1901 tmp
.pub
.beacon_interval
= beacon_interval
;
1902 tmp
.pub
.capability
= capability
;
1903 tmp
.ts_boottime
= data
->boottime_ns
;
1904 tmp
.parent_tsf
= data
->parent_tsf
;
1905 ether_addr_copy(tmp
.parent_bssid
, data
->parent_bssid
);
1908 tmp
.pub
.transmitted_bss
= non_tx_data
->tx_bss
;
1909 ts
= bss_from_pub(non_tx_data
->tx_bss
)->ts
;
1910 tmp
.pub
.bssid_index
= non_tx_data
->bssid_index
;
1911 tmp
.pub
.max_bssid_indicator
= non_tx_data
->max_bssid_indicator
;
1917 * If we do not know here whether the IEs are from a Beacon or Probe
1918 * Response frame, we need to pick one of the options and only use it
1919 * with the driver that does not provide the full Beacon/Probe Response
1920 * frame. Use Beacon frame pointer to avoid indicating that this should
1921 * override the IEs pointer should we have received an earlier
1922 * indication of Probe Response data.
1924 ies
= kzalloc(sizeof(*ies
) + ielen
, gfp
);
1929 ies
->from_beacon
= false;
1930 memcpy(ies
->data
, ie
, ielen
);
1933 case CFG80211_BSS_FTYPE_BEACON
:
1934 ies
->from_beacon
= true;
1936 case CFG80211_BSS_FTYPE_UNKNOWN
:
1937 rcu_assign_pointer(tmp
.pub
.beacon_ies
, ies
);
1939 case CFG80211_BSS_FTYPE_PRESP
:
1940 rcu_assign_pointer(tmp
.pub
.proberesp_ies
, ies
);
1943 rcu_assign_pointer(tmp
.pub
.ies
, ies
);
1945 signal_valid
= data
->chan
== channel
;
1946 res
= cfg80211_bss_update(wiphy_to_rdev(wiphy
), &tmp
, signal_valid
, ts
);
1950 if (channel
->band
== NL80211_BAND_60GHZ
) {
1951 bss_type
= res
->pub
.capability
& WLAN_CAPABILITY_DMG_TYPE_MASK
;
1952 if (bss_type
== WLAN_CAPABILITY_DMG_TYPE_AP
||
1953 bss_type
== WLAN_CAPABILITY_DMG_TYPE_PBSS
)
1954 regulatory_hint_found_beacon(wiphy
, channel
, gfp
);
1956 if (res
->pub
.capability
& WLAN_CAPABILITY_ESS
)
1957 regulatory_hint_found_beacon(wiphy
, channel
, gfp
);
1961 /* this is a nontransmitting bss, we need to add it to
1962 * transmitting bss' list if it is not there
1964 if (cfg80211_add_nontrans_list(non_tx_data
->tx_bss
,
1966 if (__cfg80211_unlink_bss(rdev
, res
))
1967 rdev
->bss_generation
++;
1971 trace_cfg80211_return_bss(&res
->pub
);
1972 /* cfg80211_bss_update gives us a referenced result */
1976 static const struct element
1977 *cfg80211_get_profile_continuation(const u8
*ie
, size_t ielen
,
1978 const struct element
*mbssid_elem
,
1979 const struct element
*sub_elem
)
1981 const u8
*mbssid_end
= mbssid_elem
->data
+ mbssid_elem
->datalen
;
1982 const struct element
*next_mbssid
;
1983 const struct element
*next_sub
;
1985 next_mbssid
= cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID
,
1987 ielen
- (mbssid_end
- ie
));
1990 * If it is not the last subelement in current MBSSID IE or there isn't
1991 * a next MBSSID IE - profile is complete.
1993 if ((sub_elem
->data
+ sub_elem
->datalen
< mbssid_end
- 1) ||
1997 /* For any length error, just return NULL */
1999 if (next_mbssid
->datalen
< 4)
2002 next_sub
= (void *)&next_mbssid
->data
[1];
2004 if (next_mbssid
->data
+ next_mbssid
->datalen
<
2005 next_sub
->data
+ next_sub
->datalen
)
2008 if (next_sub
->id
!= 0 || next_sub
->datalen
< 2)
2012 * Check if the first element in the next sub element is a start
2015 return next_sub
->data
[0] == WLAN_EID_NON_TX_BSSID_CAP
?
2019 size_t cfg80211_merge_profile(const u8
*ie
, size_t ielen
,
2020 const struct element
*mbssid_elem
,
2021 const struct element
*sub_elem
,
2022 u8
*merged_ie
, size_t max_copy_len
)
2024 size_t copied_len
= sub_elem
->datalen
;
2025 const struct element
*next_mbssid
;
2027 if (sub_elem
->datalen
> max_copy_len
)
2030 memcpy(merged_ie
, sub_elem
->data
, sub_elem
->datalen
);
2032 while ((next_mbssid
= cfg80211_get_profile_continuation(ie
, ielen
,
2035 const struct element
*next_sub
= (void *)&next_mbssid
->data
[1];
2037 if (copied_len
+ next_sub
->datalen
> max_copy_len
)
2039 memcpy(merged_ie
+ copied_len
, next_sub
->data
,
2041 copied_len
+= next_sub
->datalen
;
2046 EXPORT_SYMBOL(cfg80211_merge_profile
);
2048 static void cfg80211_parse_mbssid_data(struct wiphy
*wiphy
,
2049 struct cfg80211_inform_bss
*data
,
2050 enum cfg80211_bss_frame_type ftype
,
2051 const u8
*bssid
, u64 tsf
,
2052 u16 beacon_interval
, const u8
*ie
,
2054 struct cfg80211_non_tx_bss
*non_tx_data
,
2057 const u8
*mbssid_index_ie
;
2058 const struct element
*elem
, *sub
;
2060 u8 new_bssid
[ETH_ALEN
];
2061 u8
*new_ie
, *profile
;
2062 u64 seen_indices
= 0;
2064 struct cfg80211_bss
*bss
;
2068 if (!cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID
, ie
, ielen
))
2070 if (!wiphy
->support_mbssid
)
2072 if (wiphy
->support_only_he_mbssid
&&
2073 !cfg80211_find_ext_ie(WLAN_EID_EXT_HE_CAPABILITY
, ie
, ielen
))
2076 new_ie
= kmalloc(IEEE80211_MAX_DATA_LEN
, gfp
);
2080 profile
= kmalloc(ielen
, gfp
);
2084 for_each_element_id(elem
, WLAN_EID_MULTIPLE_BSSID
, ie
, ielen
) {
2085 if (elem
->datalen
< 4)
2087 for_each_element(sub
, elem
->data
+ 1, elem
->datalen
- 1) {
2090 if (sub
->id
!= 0 || sub
->datalen
< 4) {
2091 /* not a valid BSS profile */
2095 if (sub
->data
[0] != WLAN_EID_NON_TX_BSSID_CAP
||
2096 sub
->data
[1] != 2) {
2097 /* The first element within the Nontransmitted
2098 * BSSID Profile is not the Nontransmitted
2099 * BSSID Capability element.
2104 memset(profile
, 0, ielen
);
2105 profile_len
= cfg80211_merge_profile(ie
, ielen
,
2111 /* found a Nontransmitted BSSID Profile */
2112 mbssid_index_ie
= cfg80211_find_ie
2113 (WLAN_EID_MULTI_BSSID_IDX
,
2114 profile
, profile_len
);
2115 if (!mbssid_index_ie
|| mbssid_index_ie
[1] < 1 ||
2116 mbssid_index_ie
[2] == 0 ||
2117 mbssid_index_ie
[2] > 46) {
2118 /* No valid Multiple BSSID-Index element */
2122 if (seen_indices
& BIT_ULL(mbssid_index_ie
[2]))
2123 /* We don't support legacy split of a profile */
2124 net_dbg_ratelimited("Partial info for BSSID index %d\n",
2125 mbssid_index_ie
[2]);
2127 seen_indices
|= BIT_ULL(mbssid_index_ie
[2]);
2129 non_tx_data
->bssid_index
= mbssid_index_ie
[2];
2130 non_tx_data
->max_bssid_indicator
= elem
->data
[0];
2132 cfg80211_gen_new_bssid(bssid
,
2133 non_tx_data
->max_bssid_indicator
,
2134 non_tx_data
->bssid_index
,
2136 memset(new_ie
, 0, IEEE80211_MAX_DATA_LEN
);
2137 new_ie_len
= cfg80211_gen_new_ie(ie
, ielen
,
2139 profile_len
, new_ie
,
2144 capability
= get_unaligned_le16(profile
+ 2);
2145 bss
= cfg80211_inform_single_bss_data(wiphy
, data
,
2156 cfg80211_put_bss(wiphy
, bss
);
2165 struct cfg80211_bss
*
2166 cfg80211_inform_bss_data(struct wiphy
*wiphy
,
2167 struct cfg80211_inform_bss
*data
,
2168 enum cfg80211_bss_frame_type ftype
,
2169 const u8
*bssid
, u64 tsf
, u16 capability
,
2170 u16 beacon_interval
, const u8
*ie
, size_t ielen
,
2173 struct cfg80211_bss
*res
;
2174 struct cfg80211_non_tx_bss non_tx_data
;
2176 res
= cfg80211_inform_single_bss_data(wiphy
, data
, ftype
, bssid
, tsf
,
2177 capability
, beacon_interval
, ie
,
2181 non_tx_data
.tx_bss
= res
;
2182 cfg80211_parse_mbssid_data(wiphy
, data
, ftype
, bssid
, tsf
,
2183 beacon_interval
, ie
, ielen
, &non_tx_data
,
2187 EXPORT_SYMBOL(cfg80211_inform_bss_data
);
2190 cfg80211_parse_mbssid_frame_data(struct wiphy
*wiphy
,
2191 struct cfg80211_inform_bss
*data
,
2192 struct ieee80211_mgmt
*mgmt
, size_t len
,
2193 struct cfg80211_non_tx_bss
*non_tx_data
,
2196 enum cfg80211_bss_frame_type ftype
;
2197 const u8
*ie
= mgmt
->u
.probe_resp
.variable
;
2198 size_t ielen
= len
- offsetof(struct ieee80211_mgmt
,
2199 u
.probe_resp
.variable
);
2201 ftype
= ieee80211_is_beacon(mgmt
->frame_control
) ?
2202 CFG80211_BSS_FTYPE_BEACON
: CFG80211_BSS_FTYPE_PRESP
;
2204 cfg80211_parse_mbssid_data(wiphy
, data
, ftype
, mgmt
->bssid
,
2205 le64_to_cpu(mgmt
->u
.probe_resp
.timestamp
),
2206 le16_to_cpu(mgmt
->u
.probe_resp
.beacon_int
),
2207 ie
, ielen
, non_tx_data
, gfp
);
2211 cfg80211_update_notlisted_nontrans(struct wiphy
*wiphy
,
2212 struct cfg80211_bss
*nontrans_bss
,
2213 struct ieee80211_mgmt
*mgmt
, size_t len
)
2215 u8
*ie
, *new_ie
, *pos
;
2216 const u8
*nontrans_ssid
, *trans_ssid
, *mbssid
;
2217 size_t ielen
= len
- offsetof(struct ieee80211_mgmt
,
2218 u
.probe_resp
.variable
);
2220 struct cfg80211_bss_ies
*new_ies
;
2221 const struct cfg80211_bss_ies
*old
;
2224 lockdep_assert_held(&wiphy_to_rdev(wiphy
)->bss_lock
);
2226 ie
= mgmt
->u
.probe_resp
.variable
;
2229 trans_ssid
= cfg80211_find_ie(WLAN_EID_SSID
, ie
, ielen
);
2232 new_ie_len
-= trans_ssid
[1];
2233 mbssid
= cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID
, ie
, ielen
);
2235 * It's not valid to have the MBSSID element before SSID
2236 * ignore if that happens - the code below assumes it is
2237 * after (while copying things inbetween).
2239 if (!mbssid
|| mbssid
< trans_ssid
)
2241 new_ie_len
-= mbssid
[1];
2243 nontrans_ssid
= ieee80211_bss_get_ie(nontrans_bss
, WLAN_EID_SSID
);
2247 new_ie_len
+= nontrans_ssid
[1];
2249 /* generate new ie for nontrans BSS
2250 * 1. replace SSID with nontrans BSS' SSID
2253 new_ie
= kzalloc(new_ie_len
, GFP_ATOMIC
);
2257 new_ies
= kzalloc(sizeof(*new_ies
) + new_ie_len
, GFP_ATOMIC
);
2263 /* copy the nontransmitted SSID */
2264 cpy_len
= nontrans_ssid
[1] + 2;
2265 memcpy(pos
, nontrans_ssid
, cpy_len
);
2267 /* copy the IEs between SSID and MBSSID */
2268 cpy_len
= trans_ssid
[1] + 2;
2269 memcpy(pos
, (trans_ssid
+ cpy_len
), (mbssid
- (trans_ssid
+ cpy_len
)));
2270 pos
+= (mbssid
- (trans_ssid
+ cpy_len
));
2271 /* copy the IEs after MBSSID */
2272 cpy_len
= mbssid
[1] + 2;
2273 memcpy(pos
, mbssid
+ cpy_len
, ((ie
+ ielen
) - (mbssid
+ cpy_len
)));
2276 new_ies
->len
= new_ie_len
;
2277 new_ies
->tsf
= le64_to_cpu(mgmt
->u
.probe_resp
.timestamp
);
2278 new_ies
->from_beacon
= ieee80211_is_beacon(mgmt
->frame_control
);
2279 memcpy(new_ies
->data
, new_ie
, new_ie_len
);
2280 if (ieee80211_is_probe_resp(mgmt
->frame_control
)) {
2281 old
= rcu_access_pointer(nontrans_bss
->proberesp_ies
);
2282 rcu_assign_pointer(nontrans_bss
->proberesp_ies
, new_ies
);
2283 rcu_assign_pointer(nontrans_bss
->ies
, new_ies
);
2285 kfree_rcu((struct cfg80211_bss_ies
*)old
, rcu_head
);
2287 old
= rcu_access_pointer(nontrans_bss
->beacon_ies
);
2288 rcu_assign_pointer(nontrans_bss
->beacon_ies
, new_ies
);
2289 rcu_assign_pointer(nontrans_bss
->ies
, new_ies
);
2291 kfree_rcu((struct cfg80211_bss_ies
*)old
, rcu_head
);
2298 /* cfg80211_inform_bss_width_frame helper */
2299 static struct cfg80211_bss
*
2300 cfg80211_inform_single_bss_frame_data(struct wiphy
*wiphy
,
2301 struct cfg80211_inform_bss
*data
,
2302 struct ieee80211_mgmt
*mgmt
, size_t len
,
2305 struct cfg80211_internal_bss tmp
= {}, *res
;
2306 struct cfg80211_bss_ies
*ies
;
2307 struct ieee80211_channel
*channel
;
2309 struct ieee80211_ext
*ext
= NULL
;
2310 u8
*bssid
, *variable
;
2311 u16 capability
, beacon_int
;
2312 size_t ielen
, min_hdr_len
= offsetof(struct ieee80211_mgmt
,
2313 u
.probe_resp
.variable
);
2316 BUILD_BUG_ON(offsetof(struct ieee80211_mgmt
, u
.probe_resp
.variable
) !=
2317 offsetof(struct ieee80211_mgmt
, u
.beacon
.variable
));
2319 trace_cfg80211_inform_bss_frame(wiphy
, data
, mgmt
, len
);
2324 if (WARN_ON(!wiphy
))
2327 if (WARN_ON(wiphy
->signal_type
== CFG80211_SIGNAL_TYPE_UNSPEC
&&
2328 (data
->signal
< 0 || data
->signal
> 100)))
2331 if (ieee80211_is_s1g_beacon(mgmt
->frame_control
)) {
2332 ext
= (void *) mgmt
;
2333 min_hdr_len
= offsetof(struct ieee80211_ext
, u
.s1g_beacon
);
2334 if (ieee80211_is_s1g_short_beacon(mgmt
->frame_control
))
2335 min_hdr_len
= offsetof(struct ieee80211_ext
,
2336 u
.s1g_short_beacon
.variable
);
2339 if (WARN_ON(len
< min_hdr_len
))
2342 ielen
= len
- min_hdr_len
;
2343 variable
= mgmt
->u
.probe_resp
.variable
;
2345 if (ieee80211_is_s1g_short_beacon(mgmt
->frame_control
))
2346 variable
= ext
->u
.s1g_short_beacon
.variable
;
2348 variable
= ext
->u
.s1g_beacon
.variable
;
2351 channel
= cfg80211_get_bss_channel(wiphy
, variable
,
2352 ielen
, data
->chan
, data
->scan_width
);
2357 const struct ieee80211_s1g_bcn_compat_ie
*compat
;
2358 const struct element
*elem
;
2360 elem
= cfg80211_find_elem(WLAN_EID_S1G_BCN_COMPAT
,
2364 if (elem
->datalen
< sizeof(*compat
))
2366 compat
= (void *)elem
->data
;
2367 bssid
= ext
->u
.s1g_beacon
.sa
;
2368 capability
= le16_to_cpu(compat
->compat_info
);
2369 beacon_int
= le16_to_cpu(compat
->beacon_int
);
2371 bssid
= mgmt
->bssid
;
2372 beacon_int
= le16_to_cpu(mgmt
->u
.probe_resp
.beacon_int
);
2373 capability
= le16_to_cpu(mgmt
->u
.probe_resp
.capab_info
);
2376 ies
= kzalloc(sizeof(*ies
) + ielen
, gfp
);
2380 ies
->tsf
= le64_to_cpu(mgmt
->u
.probe_resp
.timestamp
);
2381 ies
->from_beacon
= ieee80211_is_beacon(mgmt
->frame_control
) ||
2382 ieee80211_is_s1g_beacon(mgmt
->frame_control
);
2383 memcpy(ies
->data
, variable
, ielen
);
2385 if (ieee80211_is_probe_resp(mgmt
->frame_control
))
2386 rcu_assign_pointer(tmp
.pub
.proberesp_ies
, ies
);
2388 rcu_assign_pointer(tmp
.pub
.beacon_ies
, ies
);
2389 rcu_assign_pointer(tmp
.pub
.ies
, ies
);
2391 memcpy(tmp
.pub
.bssid
, bssid
, ETH_ALEN
);
2392 tmp
.pub
.beacon_interval
= beacon_int
;
2393 tmp
.pub
.capability
= capability
;
2394 tmp
.pub
.channel
= channel
;
2395 tmp
.pub
.scan_width
= data
->scan_width
;
2396 tmp
.pub
.signal
= data
->signal
;
2397 tmp
.ts_boottime
= data
->boottime_ns
;
2398 tmp
.parent_tsf
= data
->parent_tsf
;
2399 tmp
.pub
.chains
= data
->chains
;
2400 memcpy(tmp
.pub
.chain_signal
, data
->chain_signal
, IEEE80211_MAX_CHAINS
);
2401 ether_addr_copy(tmp
.parent_bssid
, data
->parent_bssid
);
2403 signal_valid
= data
->chan
== channel
;
2404 res
= cfg80211_bss_update(wiphy_to_rdev(wiphy
), &tmp
, signal_valid
,
2409 if (channel
->band
== NL80211_BAND_60GHZ
) {
2410 bss_type
= res
->pub
.capability
& WLAN_CAPABILITY_DMG_TYPE_MASK
;
2411 if (bss_type
== WLAN_CAPABILITY_DMG_TYPE_AP
||
2412 bss_type
== WLAN_CAPABILITY_DMG_TYPE_PBSS
)
2413 regulatory_hint_found_beacon(wiphy
, channel
, gfp
);
2415 if (res
->pub
.capability
& WLAN_CAPABILITY_ESS
)
2416 regulatory_hint_found_beacon(wiphy
, channel
, gfp
);
2419 trace_cfg80211_return_bss(&res
->pub
);
2420 /* cfg80211_bss_update gives us a referenced result */
2424 struct cfg80211_bss
*
2425 cfg80211_inform_bss_frame_data(struct wiphy
*wiphy
,
2426 struct cfg80211_inform_bss
*data
,
2427 struct ieee80211_mgmt
*mgmt
, size_t len
,
2430 struct cfg80211_bss
*res
, *tmp_bss
;
2431 const u8
*ie
= mgmt
->u
.probe_resp
.variable
;
2432 const struct cfg80211_bss_ies
*ies1
, *ies2
;
2433 size_t ielen
= len
- offsetof(struct ieee80211_mgmt
,
2434 u
.probe_resp
.variable
);
2435 struct cfg80211_non_tx_bss non_tx_data
;
2437 res
= cfg80211_inform_single_bss_frame_data(wiphy
, data
, mgmt
,
2439 if (!res
|| !wiphy
->support_mbssid
||
2440 !cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID
, ie
, ielen
))
2442 if (wiphy
->support_only_he_mbssid
&&
2443 !cfg80211_find_ext_ie(WLAN_EID_EXT_HE_CAPABILITY
, ie
, ielen
))
2446 non_tx_data
.tx_bss
= res
;
2447 /* process each non-transmitting bss */
2448 cfg80211_parse_mbssid_frame_data(wiphy
, data
, mgmt
, len
,
2451 spin_lock_bh(&wiphy_to_rdev(wiphy
)->bss_lock
);
2453 /* check if the res has other nontransmitting bss which is not
2456 ies1
= rcu_access_pointer(res
->ies
);
2458 /* go through nontrans_list, if the timestamp of the BSS is
2459 * earlier than the timestamp of the transmitting BSS then
2462 list_for_each_entry(tmp_bss
, &res
->nontrans_list
,
2464 ies2
= rcu_access_pointer(tmp_bss
->ies
);
2465 if (ies2
->tsf
< ies1
->tsf
)
2466 cfg80211_update_notlisted_nontrans(wiphy
, tmp_bss
,
2469 spin_unlock_bh(&wiphy_to_rdev(wiphy
)->bss_lock
);
2473 EXPORT_SYMBOL(cfg80211_inform_bss_frame_data
);
2475 void cfg80211_ref_bss(struct wiphy
*wiphy
, struct cfg80211_bss
*pub
)
2477 struct cfg80211_registered_device
*rdev
= wiphy_to_rdev(wiphy
);
2478 struct cfg80211_internal_bss
*bss
;
2483 bss
= container_of(pub
, struct cfg80211_internal_bss
, pub
);
2485 spin_lock_bh(&rdev
->bss_lock
);
2486 bss_ref_get(rdev
, bss
);
2487 spin_unlock_bh(&rdev
->bss_lock
);
2489 EXPORT_SYMBOL(cfg80211_ref_bss
);
2491 void cfg80211_put_bss(struct wiphy
*wiphy
, struct cfg80211_bss
*pub
)
2493 struct cfg80211_registered_device
*rdev
= wiphy_to_rdev(wiphy
);
2494 struct cfg80211_internal_bss
*bss
;
2499 bss
= container_of(pub
, struct cfg80211_internal_bss
, pub
);
2501 spin_lock_bh(&rdev
->bss_lock
);
2502 bss_ref_put(rdev
, bss
);
2503 spin_unlock_bh(&rdev
->bss_lock
);
2505 EXPORT_SYMBOL(cfg80211_put_bss
);
2507 void cfg80211_unlink_bss(struct wiphy
*wiphy
, struct cfg80211_bss
*pub
)
2509 struct cfg80211_registered_device
*rdev
= wiphy_to_rdev(wiphy
);
2510 struct cfg80211_internal_bss
*bss
, *tmp1
;
2511 struct cfg80211_bss
*nontrans_bss
, *tmp
;
2516 bss
= container_of(pub
, struct cfg80211_internal_bss
, pub
);
2518 spin_lock_bh(&rdev
->bss_lock
);
2519 if (list_empty(&bss
->list
))
2522 list_for_each_entry_safe(nontrans_bss
, tmp
,
2523 &pub
->nontrans_list
,
2525 tmp1
= container_of(nontrans_bss
,
2526 struct cfg80211_internal_bss
, pub
);
2527 if (__cfg80211_unlink_bss(rdev
, tmp1
))
2528 rdev
->bss_generation
++;
2531 if (__cfg80211_unlink_bss(rdev
, bss
))
2532 rdev
->bss_generation
++;
2534 spin_unlock_bh(&rdev
->bss_lock
);
2536 EXPORT_SYMBOL(cfg80211_unlink_bss
);
2538 void cfg80211_bss_iter(struct wiphy
*wiphy
,
2539 struct cfg80211_chan_def
*chandef
,
2540 void (*iter
)(struct wiphy
*wiphy
,
2541 struct cfg80211_bss
*bss
,
2545 struct cfg80211_registered_device
*rdev
= wiphy_to_rdev(wiphy
);
2546 struct cfg80211_internal_bss
*bss
;
2548 spin_lock_bh(&rdev
->bss_lock
);
2550 list_for_each_entry(bss
, &rdev
->bss_list
, list
) {
2551 if (!chandef
|| cfg80211_is_sub_chan(chandef
, bss
->pub
.channel
))
2552 iter(wiphy
, &bss
->pub
, iter_data
);
2555 spin_unlock_bh(&rdev
->bss_lock
);
2557 EXPORT_SYMBOL(cfg80211_bss_iter
);
2559 void cfg80211_update_assoc_bss_entry(struct wireless_dev
*wdev
,
2560 struct ieee80211_channel
*chan
)
2562 struct wiphy
*wiphy
= wdev
->wiphy
;
2563 struct cfg80211_registered_device
*rdev
= wiphy_to_rdev(wiphy
);
2564 struct cfg80211_internal_bss
*cbss
= wdev
->current_bss
;
2565 struct cfg80211_internal_bss
*new = NULL
;
2566 struct cfg80211_internal_bss
*bss
;
2567 struct cfg80211_bss
*nontrans_bss
;
2568 struct cfg80211_bss
*tmp
;
2570 spin_lock_bh(&rdev
->bss_lock
);
2573 * Some APs use CSA also for bandwidth changes, i.e., without actually
2574 * changing the control channel, so no need to update in such a case.
2576 if (cbss
->pub
.channel
== chan
)
2579 /* use transmitting bss */
2580 if (cbss
->pub
.transmitted_bss
)
2581 cbss
= container_of(cbss
->pub
.transmitted_bss
,
2582 struct cfg80211_internal_bss
,
2585 cbss
->pub
.channel
= chan
;
2587 list_for_each_entry(bss
, &rdev
->bss_list
, list
) {
2588 if (!cfg80211_bss_type_match(bss
->pub
.capability
,
2589 bss
->pub
.channel
->band
,
2590 wdev
->conn_bss_type
))
2596 if (!cmp_bss(&bss
->pub
, &cbss
->pub
, BSS_CMP_REGULAR
)) {
2603 /* to save time, update IEs for transmitting bss only */
2604 if (cfg80211_update_known_bss(rdev
, cbss
, new, false)) {
2605 new->pub
.proberesp_ies
= NULL
;
2606 new->pub
.beacon_ies
= NULL
;
2609 list_for_each_entry_safe(nontrans_bss
, tmp
,
2610 &new->pub
.nontrans_list
,
2612 bss
= container_of(nontrans_bss
,
2613 struct cfg80211_internal_bss
, pub
);
2614 if (__cfg80211_unlink_bss(rdev
, bss
))
2615 rdev
->bss_generation
++;
2618 WARN_ON(atomic_read(&new->hold
));
2619 if (!WARN_ON(!__cfg80211_unlink_bss(rdev
, new)))
2620 rdev
->bss_generation
++;
2623 rb_erase(&cbss
->rbn
, &rdev
->bss_tree
);
2624 rb_insert_bss(rdev
, cbss
);
2625 rdev
->bss_generation
++;
2627 list_for_each_entry_safe(nontrans_bss
, tmp
,
2628 &cbss
->pub
.nontrans_list
,
2630 bss
= container_of(nontrans_bss
,
2631 struct cfg80211_internal_bss
, pub
);
2632 bss
->pub
.channel
= chan
;
2633 rb_erase(&bss
->rbn
, &rdev
->bss_tree
);
2634 rb_insert_bss(rdev
, bss
);
2635 rdev
->bss_generation
++;
2639 spin_unlock_bh(&rdev
->bss_lock
);
2642 #ifdef CONFIG_CFG80211_WEXT
2643 static struct cfg80211_registered_device
*
2644 cfg80211_get_dev_from_ifindex(struct net
*net
, int ifindex
)
2646 struct cfg80211_registered_device
*rdev
;
2647 struct net_device
*dev
;
2651 dev
= dev_get_by_index(net
, ifindex
);
2653 return ERR_PTR(-ENODEV
);
2654 if (dev
->ieee80211_ptr
)
2655 rdev
= wiphy_to_rdev(dev
->ieee80211_ptr
->wiphy
);
2657 rdev
= ERR_PTR(-ENODEV
);
2662 int cfg80211_wext_siwscan(struct net_device
*dev
,
2663 struct iw_request_info
*info
,
2664 union iwreq_data
*wrqu
, char *extra
)
2666 struct cfg80211_registered_device
*rdev
;
2667 struct wiphy
*wiphy
;
2668 struct iw_scan_req
*wreq
= NULL
;
2669 struct cfg80211_scan_request
*creq
= NULL
;
2670 int i
, err
, n_channels
= 0;
2671 enum nl80211_band band
;
2673 if (!netif_running(dev
))
2676 if (wrqu
->data
.length
== sizeof(struct iw_scan_req
))
2677 wreq
= (struct iw_scan_req
*)extra
;
2679 rdev
= cfg80211_get_dev_from_ifindex(dev_net(dev
), dev
->ifindex
);
2682 return PTR_ERR(rdev
);
2684 if (rdev
->scan_req
|| rdev
->scan_msg
) {
2689 wiphy
= &rdev
->wiphy
;
2691 /* Determine number of channels, needed to allocate creq */
2692 if (wreq
&& wreq
->num_channels
)
2693 n_channels
= wreq
->num_channels
;
2695 n_channels
= ieee80211_get_num_supported_channels(wiphy
);
2697 creq
= kzalloc(sizeof(*creq
) + sizeof(struct cfg80211_ssid
) +
2698 n_channels
* sizeof(void *),
2705 creq
->wiphy
= wiphy
;
2706 creq
->wdev
= dev
->ieee80211_ptr
;
2707 /* SSIDs come after channels */
2708 creq
->ssids
= (void *)&creq
->channels
[n_channels
];
2709 creq
->n_channels
= n_channels
;
2711 creq
->scan_start
= jiffies
;
2713 /* translate "Scan on frequencies" request */
2715 for (band
= 0; band
< NUM_NL80211_BANDS
; band
++) {
2718 if (!wiphy
->bands
[band
])
2721 for (j
= 0; j
< wiphy
->bands
[band
]->n_channels
; j
++) {
2722 /* ignore disabled channels */
2723 if (wiphy
->bands
[band
]->channels
[j
].flags
&
2724 IEEE80211_CHAN_DISABLED
)
2727 /* If we have a wireless request structure and the
2728 * wireless request specifies frequencies, then search
2729 * for the matching hardware channel.
2731 if (wreq
&& wreq
->num_channels
) {
2733 int wiphy_freq
= wiphy
->bands
[band
]->channels
[j
].center_freq
;
2734 for (k
= 0; k
< wreq
->num_channels
; k
++) {
2735 struct iw_freq
*freq
=
2736 &wreq
->channel_list
[k
];
2738 cfg80211_wext_freq(freq
);
2740 if (wext_freq
== wiphy_freq
)
2741 goto wext_freq_found
;
2743 goto wext_freq_not_found
;
2747 creq
->channels
[i
] = &wiphy
->bands
[band
]->channels
[j
];
2749 wext_freq_not_found
: ;
2752 /* No channels found? */
2758 /* Set real number of channels specified in creq->channels[] */
2759 creq
->n_channels
= i
;
2761 /* translate "Scan for SSID" request */
2763 if (wrqu
->data
.flags
& IW_SCAN_THIS_ESSID
) {
2764 if (wreq
->essid_len
> IEEE80211_MAX_SSID_LEN
) {
2768 memcpy(creq
->ssids
[0].ssid
, wreq
->essid
, wreq
->essid_len
);
2769 creq
->ssids
[0].ssid_len
= wreq
->essid_len
;
2771 if (wreq
->scan_type
== IW_SCAN_TYPE_PASSIVE
)
2775 for (i
= 0; i
< NUM_NL80211_BANDS
; i
++)
2776 if (wiphy
->bands
[i
])
2777 creq
->rates
[i
] = (1 << wiphy
->bands
[i
]->n_bitrates
) - 1;
2779 eth_broadcast_addr(creq
->bssid
);
2781 wiphy_lock(&rdev
->wiphy
);
2783 rdev
->scan_req
= creq
;
2784 err
= rdev_scan(rdev
, creq
);
2786 rdev
->scan_req
= NULL
;
2787 /* creq will be freed below */
2789 nl80211_send_scan_start(rdev
, dev
->ieee80211_ptr
);
2790 /* creq now owned by driver */
2794 wiphy_unlock(&rdev
->wiphy
);
2799 EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan
);
2801 static char *ieee80211_scan_add_ies(struct iw_request_info
*info
,
2802 const struct cfg80211_bss_ies
*ies
,
2803 char *current_ev
, char *end_buf
)
2805 const u8
*pos
, *end
, *next
;
2806 struct iw_event iwe
;
2812 * If needed, fragment the IEs buffer (at IE boundaries) into short
2813 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
2816 end
= pos
+ ies
->len
;
2818 while (end
- pos
> IW_GENERIC_IE_MAX
) {
2819 next
= pos
+ 2 + pos
[1];
2820 while (next
+ 2 + next
[1] - pos
< IW_GENERIC_IE_MAX
)
2821 next
= next
+ 2 + next
[1];
2823 memset(&iwe
, 0, sizeof(iwe
));
2824 iwe
.cmd
= IWEVGENIE
;
2825 iwe
.u
.data
.length
= next
- pos
;
2826 current_ev
= iwe_stream_add_point_check(info
, current_ev
,
2829 if (IS_ERR(current_ev
))
2835 memset(&iwe
, 0, sizeof(iwe
));
2836 iwe
.cmd
= IWEVGENIE
;
2837 iwe
.u
.data
.length
= end
- pos
;
2838 current_ev
= iwe_stream_add_point_check(info
, current_ev
,
2841 if (IS_ERR(current_ev
))
2849 ieee80211_bss(struct wiphy
*wiphy
, struct iw_request_info
*info
,
2850 struct cfg80211_internal_bss
*bss
, char *current_ev
,
2853 const struct cfg80211_bss_ies
*ies
;
2854 struct iw_event iwe
;
2859 bool ismesh
= false;
2861 memset(&iwe
, 0, sizeof(iwe
));
2862 iwe
.cmd
= SIOCGIWAP
;
2863 iwe
.u
.ap_addr
.sa_family
= ARPHRD_ETHER
;
2864 memcpy(iwe
.u
.ap_addr
.sa_data
, bss
->pub
.bssid
, ETH_ALEN
);
2865 current_ev
= iwe_stream_add_event_check(info
, current_ev
, end_buf
, &iwe
,
2867 if (IS_ERR(current_ev
))
2870 memset(&iwe
, 0, sizeof(iwe
));
2871 iwe
.cmd
= SIOCGIWFREQ
;
2872 iwe
.u
.freq
.m
= ieee80211_frequency_to_channel(bss
->pub
.channel
->center_freq
);
2874 current_ev
= iwe_stream_add_event_check(info
, current_ev
, end_buf
, &iwe
,
2876 if (IS_ERR(current_ev
))
2879 memset(&iwe
, 0, sizeof(iwe
));
2880 iwe
.cmd
= SIOCGIWFREQ
;
2881 iwe
.u
.freq
.m
= bss
->pub
.channel
->center_freq
;
2883 current_ev
= iwe_stream_add_event_check(info
, current_ev
, end_buf
, &iwe
,
2885 if (IS_ERR(current_ev
))
2888 if (wiphy
->signal_type
!= CFG80211_SIGNAL_TYPE_NONE
) {
2889 memset(&iwe
, 0, sizeof(iwe
));
2891 iwe
.u
.qual
.updated
= IW_QUAL_LEVEL_UPDATED
|
2892 IW_QUAL_NOISE_INVALID
|
2893 IW_QUAL_QUAL_UPDATED
;
2894 switch (wiphy
->signal_type
) {
2895 case CFG80211_SIGNAL_TYPE_MBM
:
2896 sig
= bss
->pub
.signal
/ 100;
2897 iwe
.u
.qual
.level
= sig
;
2898 iwe
.u
.qual
.updated
|= IW_QUAL_DBM
;
2899 if (sig
< -110) /* rather bad */
2901 else if (sig
> -40) /* perfect */
2903 /* will give a range of 0 .. 70 */
2904 iwe
.u
.qual
.qual
= sig
+ 110;
2906 case CFG80211_SIGNAL_TYPE_UNSPEC
:
2907 iwe
.u
.qual
.level
= bss
->pub
.signal
;
2908 /* will give range 0 .. 100 */
2909 iwe
.u
.qual
.qual
= bss
->pub
.signal
;
2915 current_ev
= iwe_stream_add_event_check(info
, current_ev
,
2918 if (IS_ERR(current_ev
))
2922 memset(&iwe
, 0, sizeof(iwe
));
2923 iwe
.cmd
= SIOCGIWENCODE
;
2924 if (bss
->pub
.capability
& WLAN_CAPABILITY_PRIVACY
)
2925 iwe
.u
.data
.flags
= IW_ENCODE_ENABLED
| IW_ENCODE_NOKEY
;
2927 iwe
.u
.data
.flags
= IW_ENCODE_DISABLED
;
2928 iwe
.u
.data
.length
= 0;
2929 current_ev
= iwe_stream_add_point_check(info
, current_ev
, end_buf
,
2931 if (IS_ERR(current_ev
))
2935 ies
= rcu_dereference(bss
->pub
.ies
);
2941 if (ie
[1] > rem
- 2)
2946 memset(&iwe
, 0, sizeof(iwe
));
2947 iwe
.cmd
= SIOCGIWESSID
;
2948 iwe
.u
.data
.length
= ie
[1];
2949 iwe
.u
.data
.flags
= 1;
2950 current_ev
= iwe_stream_add_point_check(info
,
2954 if (IS_ERR(current_ev
))
2957 case WLAN_EID_MESH_ID
:
2958 memset(&iwe
, 0, sizeof(iwe
));
2959 iwe
.cmd
= SIOCGIWESSID
;
2960 iwe
.u
.data
.length
= ie
[1];
2961 iwe
.u
.data
.flags
= 1;
2962 current_ev
= iwe_stream_add_point_check(info
,
2966 if (IS_ERR(current_ev
))
2969 case WLAN_EID_MESH_CONFIG
:
2971 if (ie
[1] != sizeof(struct ieee80211_meshconf_ie
))
2974 memset(&iwe
, 0, sizeof(iwe
));
2975 iwe
.cmd
= IWEVCUSTOM
;
2976 sprintf(buf
, "Mesh Network Path Selection Protocol ID: "
2978 iwe
.u
.data
.length
= strlen(buf
);
2979 current_ev
= iwe_stream_add_point_check(info
,
2983 if (IS_ERR(current_ev
))
2985 sprintf(buf
, "Path Selection Metric ID: 0x%02X",
2987 iwe
.u
.data
.length
= strlen(buf
);
2988 current_ev
= iwe_stream_add_point_check(info
,
2992 if (IS_ERR(current_ev
))
2994 sprintf(buf
, "Congestion Control Mode ID: 0x%02X",
2996 iwe
.u
.data
.length
= strlen(buf
);
2997 current_ev
= iwe_stream_add_point_check(info
,
3001 if (IS_ERR(current_ev
))
3003 sprintf(buf
, "Synchronization ID: 0x%02X", cfg
[3]);
3004 iwe
.u
.data
.length
= strlen(buf
);
3005 current_ev
= iwe_stream_add_point_check(info
,
3009 if (IS_ERR(current_ev
))
3011 sprintf(buf
, "Authentication ID: 0x%02X", cfg
[4]);
3012 iwe
.u
.data
.length
= strlen(buf
);
3013 current_ev
= iwe_stream_add_point_check(info
,
3017 if (IS_ERR(current_ev
))
3019 sprintf(buf
, "Formation Info: 0x%02X", cfg
[5]);
3020 iwe
.u
.data
.length
= strlen(buf
);
3021 current_ev
= iwe_stream_add_point_check(info
,
3025 if (IS_ERR(current_ev
))
3027 sprintf(buf
, "Capabilities: 0x%02X", cfg
[6]);
3028 iwe
.u
.data
.length
= strlen(buf
);
3029 current_ev
= iwe_stream_add_point_check(info
,
3033 if (IS_ERR(current_ev
))
3036 case WLAN_EID_SUPP_RATES
:
3037 case WLAN_EID_EXT_SUPP_RATES
:
3038 /* display all supported rates in readable format */
3039 p
= current_ev
+ iwe_stream_lcp_len(info
);
3041 memset(&iwe
, 0, sizeof(iwe
));
3042 iwe
.cmd
= SIOCGIWRATE
;
3043 /* Those two flags are ignored... */
3044 iwe
.u
.bitrate
.fixed
= iwe
.u
.bitrate
.disabled
= 0;
3046 for (i
= 0; i
< ie
[1]; i
++) {
3047 iwe
.u
.bitrate
.value
=
3048 ((ie
[i
+ 2] & 0x7f) * 500000);
3050 p
= iwe_stream_add_value(info
, current_ev
, p
,
3054 current_ev
= ERR_PTR(-E2BIG
);
3065 if (bss
->pub
.capability
& (WLAN_CAPABILITY_ESS
| WLAN_CAPABILITY_IBSS
) ||
3067 memset(&iwe
, 0, sizeof(iwe
));
3068 iwe
.cmd
= SIOCGIWMODE
;
3070 iwe
.u
.mode
= IW_MODE_MESH
;
3071 else if (bss
->pub
.capability
& WLAN_CAPABILITY_ESS
)
3072 iwe
.u
.mode
= IW_MODE_MASTER
;
3074 iwe
.u
.mode
= IW_MODE_ADHOC
;
3075 current_ev
= iwe_stream_add_event_check(info
, current_ev
,
3078 if (IS_ERR(current_ev
))
3082 memset(&iwe
, 0, sizeof(iwe
));
3083 iwe
.cmd
= IWEVCUSTOM
;
3084 sprintf(buf
, "tsf=%016llx", (unsigned long long)(ies
->tsf
));
3085 iwe
.u
.data
.length
= strlen(buf
);
3086 current_ev
= iwe_stream_add_point_check(info
, current_ev
, end_buf
,
3088 if (IS_ERR(current_ev
))
3090 memset(&iwe
, 0, sizeof(iwe
));
3091 iwe
.cmd
= IWEVCUSTOM
;
3092 sprintf(buf
, " Last beacon: %ums ago",
3093 elapsed_jiffies_msecs(bss
->ts
));
3094 iwe
.u
.data
.length
= strlen(buf
);
3095 current_ev
= iwe_stream_add_point_check(info
, current_ev
,
3096 end_buf
, &iwe
, buf
);
3097 if (IS_ERR(current_ev
))
3100 current_ev
= ieee80211_scan_add_ies(info
, ies
, current_ev
, end_buf
);
3108 static int ieee80211_scan_results(struct cfg80211_registered_device
*rdev
,
3109 struct iw_request_info
*info
,
3110 char *buf
, size_t len
)
3112 char *current_ev
= buf
;
3113 char *end_buf
= buf
+ len
;
3114 struct cfg80211_internal_bss
*bss
;
3117 spin_lock_bh(&rdev
->bss_lock
);
3118 cfg80211_bss_expire(rdev
);
3120 list_for_each_entry(bss
, &rdev
->bss_list
, list
) {
3121 if (buf
+ len
- current_ev
<= IW_EV_ADDR_LEN
) {
3125 current_ev
= ieee80211_bss(&rdev
->wiphy
, info
, bss
,
3126 current_ev
, end_buf
);
3127 if (IS_ERR(current_ev
)) {
3128 err
= PTR_ERR(current_ev
);
3132 spin_unlock_bh(&rdev
->bss_lock
);
3136 return current_ev
- buf
;
3140 int cfg80211_wext_giwscan(struct net_device
*dev
,
3141 struct iw_request_info
*info
,
3142 struct iw_point
*data
, char *extra
)
3144 struct cfg80211_registered_device
*rdev
;
3147 if (!netif_running(dev
))
3150 rdev
= cfg80211_get_dev_from_ifindex(dev_net(dev
), dev
->ifindex
);
3153 return PTR_ERR(rdev
);
3155 if (rdev
->scan_req
|| rdev
->scan_msg
)
3158 res
= ieee80211_scan_results(rdev
, info
, extra
, data
->length
);
3167 EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan
);