2 * IBSS mode implementation
3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 * Copyright 2009, Johannes Berg <johannes@sipsolutions.net>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
15 #include <linux/delay.h>
16 #include <linux/slab.h>
17 #include <linux/if_ether.h>
18 #include <linux/skbuff.h>
19 #include <linux/if_arp.h>
20 #include <linux/etherdevice.h>
21 #include <linux/rtnetlink.h>
22 #include <net/mac80211.h>
24 #include "ieee80211_i.h"
25 #include "driver-ops.h"
28 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
29 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
31 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
32 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
33 #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ)
35 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
37 static struct beacon_data
*
38 ieee80211_ibss_build_presp(struct ieee80211_sub_if_data
*sdata
,
39 const int beacon_int
, const u32 basic_rates
,
40 const u16 capability
, u64 tsf
,
41 struct cfg80211_chan_def
*chandef
,
42 bool *have_higher_than_11mbit
,
43 struct cfg80211_csa_settings
*csa_settings
)
45 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
46 struct ieee80211_local
*local
= sdata
->local
;
47 int rates_n
= 0, i
, ri
;
48 struct ieee80211_mgmt
*mgmt
;
50 struct ieee80211_supported_band
*sband
;
51 u32 rate_flags
, rates
= 0, rates_added
= 0;
52 struct beacon_data
*presp
;
56 /* Build IBSS probe response */
57 frame_len
= sizeof(struct ieee80211_hdr_3addr
) +
58 12 /* struct ieee80211_mgmt.u.beacon */ +
59 2 + IEEE80211_MAX_SSID_LEN
/* max SSID */ +
60 2 + 8 /* max Supported Rates */ +
61 3 /* max DS params */ +
63 5 /* Channel Switch Announcement */ +
64 2 + (IEEE80211_MAX_SUPP_RATES
- 8) +
65 2 + sizeof(struct ieee80211_ht_cap
) +
66 2 + sizeof(struct ieee80211_ht_operation
) +
68 presp
= kzalloc(sizeof(*presp
) + frame_len
, GFP_KERNEL
);
72 presp
->head
= (void *)(presp
+ 1);
74 mgmt
= (void *) presp
->head
;
75 mgmt
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
76 IEEE80211_STYPE_PROBE_RESP
);
77 eth_broadcast_addr(mgmt
->da
);
78 memcpy(mgmt
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
79 memcpy(mgmt
->bssid
, ifibss
->bssid
, ETH_ALEN
);
80 mgmt
->u
.beacon
.beacon_int
= cpu_to_le16(beacon_int
);
81 mgmt
->u
.beacon
.timestamp
= cpu_to_le64(tsf
);
82 mgmt
->u
.beacon
.capab_info
= cpu_to_le16(capability
);
84 pos
= (u8
*)mgmt
+ offsetof(struct ieee80211_mgmt
, u
.beacon
.variable
);
86 *pos
++ = WLAN_EID_SSID
;
87 *pos
++ = ifibss
->ssid_len
;
88 memcpy(pos
, ifibss
->ssid
, ifibss
->ssid_len
);
89 pos
+= ifibss
->ssid_len
;
91 sband
= local
->hw
.wiphy
->bands
[chandef
->chan
->band
];
92 rate_flags
= ieee80211_chandef_rate_flags(chandef
);
93 shift
= ieee80211_chandef_get_shift(chandef
);
95 if (have_higher_than_11mbit
)
96 *have_higher_than_11mbit
= false;
98 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
99 if ((rate_flags
& sband
->bitrates
[i
].flags
) != rate_flags
)
101 if (sband
->bitrates
[i
].bitrate
> 110 &&
102 have_higher_than_11mbit
)
103 *have_higher_than_11mbit
= true;
109 *pos
++ = WLAN_EID_SUPP_RATES
;
110 *pos
++ = min_t(int, 8, rates_n
);
111 for (ri
= 0; ri
< sband
->n_bitrates
; ri
++) {
112 int rate
= DIV_ROUND_UP(sband
->bitrates
[ri
].bitrate
,
115 if (!(rates
& BIT(ri
)))
118 if (basic_rates
& BIT(ri
))
120 *pos
++ = basic
| (u8
) rate
;
121 if (++rates_added
== 8) {
122 ri
++; /* continue at next rate for EXT_SUPP_RATES */
127 if (sband
->band
== IEEE80211_BAND_2GHZ
) {
128 *pos
++ = WLAN_EID_DS_PARAMS
;
130 *pos
++ = ieee80211_frequency_to_channel(
131 chandef
->chan
->center_freq
);
134 *pos
++ = WLAN_EID_IBSS_PARAMS
;
136 /* FIX: set ATIM window based on scan results */
141 *pos
++ = WLAN_EID_CHANNEL_SWITCH
;
143 *pos
++ = csa_settings
->block_tx
? 1 : 0;
144 *pos
++ = ieee80211_frequency_to_channel(
145 csa_settings
->chandef
.chan
->center_freq
);
146 presp
->csa_counter_offsets
[0] = (pos
- presp
->head
);
147 *pos
++ = csa_settings
->count
;
150 /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
152 *pos
++ = WLAN_EID_EXT_SUPP_RATES
;
153 *pos
++ = rates_n
- 8;
154 for (; ri
< sband
->n_bitrates
; ri
++) {
155 int rate
= DIV_ROUND_UP(sband
->bitrates
[ri
].bitrate
,
158 if (!(rates
& BIT(ri
)))
161 if (basic_rates
& BIT(ri
))
163 *pos
++ = basic
| (u8
) rate
;
167 if (ifibss
->ie_len
) {
168 memcpy(pos
, ifibss
->ie
, ifibss
->ie_len
);
169 pos
+= ifibss
->ie_len
;
172 /* add HT capability and information IEs */
173 if (chandef
->width
!= NL80211_CHAN_WIDTH_20_NOHT
&&
174 chandef
->width
!= NL80211_CHAN_WIDTH_5
&&
175 chandef
->width
!= NL80211_CHAN_WIDTH_10
&&
176 sband
->ht_cap
.ht_supported
) {
177 struct ieee80211_sta_ht_cap ht_cap
;
179 memcpy(&ht_cap
, &sband
->ht_cap
, sizeof(ht_cap
));
180 ieee80211_apply_htcap_overrides(sdata
, &ht_cap
);
182 pos
= ieee80211_ie_build_ht_cap(pos
, &ht_cap
, ht_cap
.cap
);
184 * Note: According to 802.11n-2009 9.13.3.1, HT Protection
185 * field and RIFS Mode are reserved in IBSS mode, therefore
188 pos
= ieee80211_ie_build_ht_oper(pos
, &sband
->ht_cap
,
192 if (local
->hw
.queues
>= IEEE80211_NUM_ACS
)
193 pos
= ieee80211_add_wmm_info_ie(pos
, 0); /* U-APSD not in use */
195 presp
->head_len
= pos
- presp
->head
;
196 if (WARN_ON(presp
->head_len
> frame_len
))
205 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data
*sdata
,
206 const u8
*bssid
, const int beacon_int
,
207 struct cfg80211_chan_def
*req_chandef
,
208 const u32 basic_rates
,
209 const u16 capability
, u64 tsf
,
212 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
213 struct ieee80211_local
*local
= sdata
->local
;
214 struct ieee80211_mgmt
*mgmt
;
215 struct cfg80211_bss
*bss
;
217 struct cfg80211_chan_def chandef
;
218 struct ieee80211_channel
*chan
;
219 struct beacon_data
*presp
;
220 enum nl80211_bss_scan_width scan_width
;
221 bool have_higher_than_11mbit
;
225 sdata_assert_lock(sdata
);
227 /* Reset own TSF to allow time synchronization work. */
228 drv_reset_tsf(local
, sdata
);
230 if (!ether_addr_equal(ifibss
->bssid
, bssid
))
231 sta_info_flush(sdata
);
233 /* if merging, indicate to driver that we leave the old IBSS */
234 if (sdata
->vif
.bss_conf
.ibss_joined
) {
235 sdata
->vif
.bss_conf
.ibss_joined
= false;
236 sdata
->vif
.bss_conf
.ibss_creator
= false;
237 sdata
->vif
.bss_conf
.enable_beacon
= false;
238 netif_carrier_off(sdata
->dev
);
239 ieee80211_bss_info_change_notify(sdata
,
241 BSS_CHANGED_BEACON_ENABLED
);
242 drv_leave_ibss(local
, sdata
);
245 presp
= rcu_dereference_protected(ifibss
->presp
,
246 lockdep_is_held(&sdata
->wdev
.mtx
));
247 RCU_INIT_POINTER(ifibss
->presp
, NULL
);
249 kfree_rcu(presp
, rcu_head
);
251 sdata
->drop_unencrypted
= capability
& WLAN_CAPABILITY_PRIVACY
? 1 : 0;
253 /* make a copy of the chandef, it could be modified below. */
254 chandef
= *req_chandef
;
256 if (!cfg80211_reg_can_beacon(local
->hw
.wiphy
, &chandef
,
257 NL80211_IFTYPE_ADHOC
)) {
258 if (chandef
.width
== NL80211_CHAN_WIDTH_5
||
259 chandef
.width
== NL80211_CHAN_WIDTH_10
||
260 chandef
.width
== NL80211_CHAN_WIDTH_20_NOHT
||
261 chandef
.width
== NL80211_CHAN_WIDTH_20
) {
263 "Failed to join IBSS, beacons forbidden\n");
266 chandef
.width
= NL80211_CHAN_WIDTH_20
;
267 chandef
.center_freq1
= chan
->center_freq
;
268 /* check again for downgraded chandef */
269 if (!cfg80211_reg_can_beacon(local
->hw
.wiphy
, &chandef
,
270 NL80211_IFTYPE_ADHOC
)) {
272 "Failed to join IBSS, beacons forbidden\n");
277 err
= cfg80211_chandef_dfs_required(sdata
->local
->hw
.wiphy
,
278 &chandef
, NL80211_IFTYPE_ADHOC
);
281 "Failed to join IBSS, invalid chandef\n");
284 if (err
> 0 && !ifibss
->userspace_handles_dfs
) {
286 "Failed to join IBSS, DFS channel without control program\n");
290 radar_required
= err
;
292 mutex_lock(&local
->mtx
);
293 if (ieee80211_vif_use_channel(sdata
, &chandef
,
294 ifibss
->fixed_channel
?
295 IEEE80211_CHANCTX_SHARED
:
296 IEEE80211_CHANCTX_EXCLUSIVE
)) {
297 sdata_info(sdata
, "Failed to join IBSS, no channel context\n");
298 mutex_unlock(&local
->mtx
);
301 sdata
->radar_required
= radar_required
;
302 mutex_unlock(&local
->mtx
);
304 memcpy(ifibss
->bssid
, bssid
, ETH_ALEN
);
306 presp
= ieee80211_ibss_build_presp(sdata
, beacon_int
, basic_rates
,
307 capability
, tsf
, &chandef
,
308 &have_higher_than_11mbit
, NULL
);
312 rcu_assign_pointer(ifibss
->presp
, presp
);
313 mgmt
= (void *)presp
->head
;
315 sdata
->vif
.bss_conf
.enable_beacon
= true;
316 sdata
->vif
.bss_conf
.beacon_int
= beacon_int
;
317 sdata
->vif
.bss_conf
.basic_rates
= basic_rates
;
318 sdata
->vif
.bss_conf
.ssid_len
= ifibss
->ssid_len
;
319 memcpy(sdata
->vif
.bss_conf
.ssid
, ifibss
->ssid
, ifibss
->ssid_len
);
320 bss_change
= BSS_CHANGED_BEACON_INT
;
321 bss_change
|= ieee80211_reset_erp_info(sdata
);
322 bss_change
|= BSS_CHANGED_BSSID
;
323 bss_change
|= BSS_CHANGED_BEACON
;
324 bss_change
|= BSS_CHANGED_BEACON_ENABLED
;
325 bss_change
|= BSS_CHANGED_BASIC_RATES
;
326 bss_change
|= BSS_CHANGED_HT
;
327 bss_change
|= BSS_CHANGED_IBSS
;
328 bss_change
|= BSS_CHANGED_SSID
;
331 * In 5 GHz/802.11a, we can always use short slot time.
332 * (IEEE 802.11-2012 18.3.8.7)
334 * In 2.4GHz, we must always use long slots in IBSS for compatibility
336 * (IEEE 802.11-2012 19.4.5)
338 * HT follows these specifications (IEEE 802.11-2012 20.3.18)
340 sdata
->vif
.bss_conf
.use_short_slot
= chan
->band
== IEEE80211_BAND_5GHZ
;
341 bss_change
|= BSS_CHANGED_ERP_SLOT
;
343 /* cf. IEEE 802.11 9.2.12 */
344 if (chan
->band
== IEEE80211_BAND_2GHZ
&& have_higher_than_11mbit
)
345 sdata
->flags
|= IEEE80211_SDATA_OPERATING_GMODE
;
347 sdata
->flags
&= ~IEEE80211_SDATA_OPERATING_GMODE
;
349 ieee80211_set_wmm_default(sdata
, true);
351 sdata
->vif
.bss_conf
.ibss_joined
= true;
352 sdata
->vif
.bss_conf
.ibss_creator
= creator
;
354 err
= drv_join_ibss(local
, sdata
);
356 sdata
->vif
.bss_conf
.ibss_joined
= false;
357 sdata
->vif
.bss_conf
.ibss_creator
= false;
358 sdata
->vif
.bss_conf
.enable_beacon
= false;
359 sdata
->vif
.bss_conf
.ssid_len
= 0;
360 RCU_INIT_POINTER(ifibss
->presp
, NULL
);
361 kfree_rcu(presp
, rcu_head
);
362 mutex_lock(&local
->mtx
);
363 ieee80211_vif_release_channel(sdata
);
364 mutex_unlock(&local
->mtx
);
365 sdata_info(sdata
, "Failed to join IBSS, driver failure: %d\n",
370 ieee80211_bss_info_change_notify(sdata
, bss_change
);
372 ifibss
->state
= IEEE80211_IBSS_MLME_JOINED
;
373 mod_timer(&ifibss
->timer
,
374 round_jiffies(jiffies
+ IEEE80211_IBSS_MERGE_INTERVAL
));
376 scan_width
= cfg80211_chandef_to_scan_width(&chandef
);
377 bss
= cfg80211_inform_bss_width_frame(local
->hw
.wiphy
, chan
,
379 presp
->head_len
, 0, GFP_KERNEL
);
380 cfg80211_put_bss(local
->hw
.wiphy
, bss
);
381 netif_carrier_on(sdata
->dev
);
382 cfg80211_ibss_joined(sdata
->dev
, ifibss
->bssid
, chan
, GFP_KERNEL
);
385 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data
*sdata
,
386 struct ieee80211_bss
*bss
)
388 struct cfg80211_bss
*cbss
=
389 container_of((void *)bss
, struct cfg80211_bss
, priv
);
390 struct ieee80211_supported_band
*sband
;
391 struct cfg80211_chan_def chandef
;
394 u16 beacon_int
= cbss
->beacon_interval
;
395 const struct cfg80211_bss_ies
*ies
;
396 enum nl80211_channel_type chan_type
;
401 sdata_assert_lock(sdata
);
406 switch (sdata
->u
.ibss
.chandef
.width
) {
407 case NL80211_CHAN_WIDTH_20_NOHT
:
408 case NL80211_CHAN_WIDTH_20
:
409 case NL80211_CHAN_WIDTH_40
:
410 chan_type
= cfg80211_get_chandef_type(&sdata
->u
.ibss
.chandef
);
411 cfg80211_chandef_create(&chandef
, cbss
->channel
, chan_type
);
413 case NL80211_CHAN_WIDTH_5
:
414 case NL80211_CHAN_WIDTH_10
:
415 cfg80211_chandef_create(&chandef
, cbss
->channel
,
416 NL80211_CHAN_WIDTH_20_NOHT
);
417 chandef
.width
= sdata
->u
.ibss
.chandef
.width
;
420 /* fall back to 20 MHz for unsupported modes */
421 cfg80211_chandef_create(&chandef
, cbss
->channel
,
422 NL80211_CHAN_WIDTH_20_NOHT
);
426 sband
= sdata
->local
->hw
.wiphy
->bands
[cbss
->channel
->band
];
427 rate_flags
= ieee80211_chandef_rate_flags(&sdata
->u
.ibss
.chandef
);
428 shift
= ieee80211_vif_get_shift(&sdata
->vif
);
432 for (i
= 0; i
< bss
->supp_rates_len
; i
++) {
433 int rate
= bss
->supp_rates
[i
] & 0x7f;
434 bool is_basic
= !!(bss
->supp_rates
[i
] & 0x80);
436 for (j
= 0; j
< sband
->n_bitrates
; j
++) {
438 if ((rate_flags
& sband
->bitrates
[j
].flags
)
442 brate
= DIV_ROUND_UP(sband
->bitrates
[j
].bitrate
,
446 basic_rates
|= BIT(j
);
453 ies
= rcu_dereference(cbss
->ies
);
457 __ieee80211_sta_join_ibss(sdata
, cbss
->bssid
,
465 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data
*sdata
,
466 struct cfg80211_csa_settings
*csa_settings
)
468 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
469 struct beacon_data
*presp
, *old_presp
;
470 struct cfg80211_bss
*cbss
;
471 const struct cfg80211_bss_ies
*ies
;
476 sdata_assert_lock(sdata
);
478 capability
= WLAN_CAPABILITY_IBSS
;
481 capability
|= WLAN_CAPABILITY_PRIVACY
;
483 cbss
= cfg80211_get_bss(sdata
->local
->hw
.wiphy
, ifibss
->chandef
.chan
,
484 ifibss
->bssid
, ifibss
->ssid
,
485 ifibss
->ssid_len
, WLAN_CAPABILITY_IBSS
|
486 WLAN_CAPABILITY_PRIVACY
,
489 if (WARN_ON(!cbss
)) {
495 ies
= rcu_dereference(cbss
->ies
);
498 cfg80211_put_bss(sdata
->local
->hw
.wiphy
, cbss
);
500 old_presp
= rcu_dereference_protected(ifibss
->presp
,
501 lockdep_is_held(&sdata
->wdev
.mtx
));
503 presp
= ieee80211_ibss_build_presp(sdata
,
504 sdata
->vif
.bss_conf
.beacon_int
,
505 sdata
->vif
.bss_conf
.basic_rates
,
506 capability
, tsf
, &ifibss
->chandef
,
513 rcu_assign_pointer(ifibss
->presp
, presp
);
515 kfree_rcu(old_presp
, rcu_head
);
517 return BSS_CHANGED_BEACON
;
522 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data
*sdata
)
524 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
525 struct cfg80211_bss
*cbss
;
526 int err
, changed
= 0;
529 sdata_assert_lock(sdata
);
531 /* update cfg80211 bss information with the new channel */
532 if (!is_zero_ether_addr(ifibss
->bssid
)) {
533 capability
= WLAN_CAPABILITY_IBSS
;
536 capability
|= WLAN_CAPABILITY_PRIVACY
;
538 cbss
= cfg80211_get_bss(sdata
->local
->hw
.wiphy
,
539 ifibss
->chandef
.chan
,
540 ifibss
->bssid
, ifibss
->ssid
,
541 ifibss
->ssid_len
, WLAN_CAPABILITY_IBSS
|
542 WLAN_CAPABILITY_PRIVACY
,
544 /* XXX: should not really modify cfg80211 data */
546 cbss
->channel
= sdata
->csa_chandef
.chan
;
547 cfg80211_put_bss(sdata
->local
->hw
.wiphy
, cbss
);
551 ifibss
->chandef
= sdata
->csa_chandef
;
553 /* generate the beacon */
554 err
= ieee80211_ibss_csa_beacon(sdata
, NULL
);
563 void ieee80211_ibss_stop(struct ieee80211_sub_if_data
*sdata
)
565 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
567 cancel_work_sync(&ifibss
->csa_connection_drop_work
);
570 static struct sta_info
*ieee80211_ibss_finish_sta(struct sta_info
*sta
)
573 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
576 memcpy(addr
, sta
->sta
.addr
, ETH_ALEN
);
578 ibss_dbg(sdata
, "Adding new IBSS station %pM\n", addr
);
580 sta_info_pre_move_state(sta
, IEEE80211_STA_AUTH
);
581 sta_info_pre_move_state(sta
, IEEE80211_STA_ASSOC
);
582 /* authorize the station only if the network is not RSN protected. If
583 * not wait for the userspace to authorize it */
584 if (!sta
->sdata
->u
.ibss
.control_port
)
585 sta_info_pre_move_state(sta
, IEEE80211_STA_AUTHORIZED
);
587 rate_control_rate_init(sta
);
589 /* If it fails, maybe we raced another insertion? */
590 if (sta_info_insert_rcu(sta
))
591 return sta_info_get(sdata
, addr
);
595 static struct sta_info
*
596 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data
*sdata
, const u8
*bssid
,
597 const u8
*addr
, u32 supp_rates
)
600 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
601 struct ieee80211_local
*local
= sdata
->local
;
602 struct sta_info
*sta
;
603 struct ieee80211_chanctx_conf
*chanctx_conf
;
604 struct ieee80211_supported_band
*sband
;
605 enum nl80211_bss_scan_width scan_width
;
609 * XXX: Consider removing the least recently used entry and
610 * allow new one to be added.
612 if (local
->num_sta
>= IEEE80211_IBSS_MAX_STA_ENTRIES
) {
613 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
619 if (ifibss
->state
== IEEE80211_IBSS_MLME_SEARCH
) {
624 if (!ether_addr_equal(bssid
, sdata
->u
.ibss
.bssid
)) {
630 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
631 if (WARN_ON_ONCE(!chanctx_conf
))
633 band
= chanctx_conf
->def
.chan
->band
;
634 scan_width
= cfg80211_chandef_to_scan_width(&chanctx_conf
->def
);
637 sta
= sta_info_alloc(sdata
, addr
, GFP_KERNEL
);
643 sta
->last_rx
= jiffies
;
645 /* make sure mandatory rates are always added */
646 sband
= local
->hw
.wiphy
->bands
[band
];
647 sta
->sta
.supp_rates
[band
] = supp_rates
|
648 ieee80211_mandatory_rates(sband
, scan_width
);
650 return ieee80211_ibss_finish_sta(sta
);
653 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data
*sdata
)
655 struct ieee80211_local
*local
= sdata
->local
;
657 struct sta_info
*sta
;
659 sdata_assert_lock(sdata
);
663 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
664 if (sta
->sdata
== sdata
&&
665 time_after(sta
->last_rx
+ IEEE80211_IBSS_MERGE_INTERVAL
,
677 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data
*sdata
)
679 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
680 struct ieee80211_local
*local
= sdata
->local
;
681 struct cfg80211_bss
*cbss
;
682 struct beacon_data
*presp
;
683 struct sta_info
*sta
;
686 if (!is_zero_ether_addr(ifibss
->bssid
)) {
687 capability
= WLAN_CAPABILITY_IBSS
;
690 capability
|= WLAN_CAPABILITY_PRIVACY
;
692 cbss
= cfg80211_get_bss(local
->hw
.wiphy
, ifibss
->chandef
.chan
,
693 ifibss
->bssid
, ifibss
->ssid
,
694 ifibss
->ssid_len
, WLAN_CAPABILITY_IBSS
|
695 WLAN_CAPABILITY_PRIVACY
,
699 cfg80211_unlink_bss(local
->hw
.wiphy
, cbss
);
700 cfg80211_put_bss(sdata
->local
->hw
.wiphy
, cbss
);
704 ifibss
->state
= IEEE80211_IBSS_MLME_SEARCH
;
706 sta_info_flush(sdata
);
708 spin_lock_bh(&ifibss
->incomplete_lock
);
709 while (!list_empty(&ifibss
->incomplete_stations
)) {
710 sta
= list_first_entry(&ifibss
->incomplete_stations
,
711 struct sta_info
, list
);
712 list_del(&sta
->list
);
713 spin_unlock_bh(&ifibss
->incomplete_lock
);
715 sta_info_free(local
, sta
);
716 spin_lock_bh(&ifibss
->incomplete_lock
);
718 spin_unlock_bh(&ifibss
->incomplete_lock
);
720 netif_carrier_off(sdata
->dev
);
722 sdata
->vif
.bss_conf
.ibss_joined
= false;
723 sdata
->vif
.bss_conf
.ibss_creator
= false;
724 sdata
->vif
.bss_conf
.enable_beacon
= false;
725 sdata
->vif
.bss_conf
.ssid_len
= 0;
728 presp
= rcu_dereference_protected(ifibss
->presp
,
729 lockdep_is_held(&sdata
->wdev
.mtx
));
730 RCU_INIT_POINTER(sdata
->u
.ibss
.presp
, NULL
);
732 kfree_rcu(presp
, rcu_head
);
734 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED
, &sdata
->state
);
735 ieee80211_bss_info_change_notify(sdata
, BSS_CHANGED_BEACON_ENABLED
|
737 drv_leave_ibss(local
, sdata
);
738 mutex_lock(&local
->mtx
);
739 ieee80211_vif_release_channel(sdata
);
740 mutex_unlock(&local
->mtx
);
743 static void ieee80211_csa_connection_drop_work(struct work_struct
*work
)
745 struct ieee80211_sub_if_data
*sdata
=
746 container_of(work
, struct ieee80211_sub_if_data
,
747 u
.ibss
.csa_connection_drop_work
);
751 ieee80211_ibss_disconnect(sdata
);
753 skb_queue_purge(&sdata
->skb_queue
);
755 /* trigger a scan to find another IBSS network to join */
756 ieee80211_queue_work(&sdata
->local
->hw
, &sdata
->work
);
761 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data
*sdata
)
763 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
766 /* if the current channel is a DFS channel, mark the channel as
769 err
= cfg80211_chandef_dfs_required(sdata
->local
->hw
.wiphy
,
771 NL80211_IFTYPE_ADHOC
);
773 cfg80211_radar_event(sdata
->local
->hw
.wiphy
, &ifibss
->chandef
,
778 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data
*sdata
,
779 struct ieee802_11_elems
*elems
,
782 struct cfg80211_csa_settings params
;
783 struct ieee80211_csa_ie csa_ie
;
784 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
785 enum nl80211_channel_type ch_type
;
789 sdata_assert_lock(sdata
);
791 sta_flags
= IEEE80211_STA_DISABLE_VHT
;
792 switch (ifibss
->chandef
.width
) {
793 case NL80211_CHAN_WIDTH_5
:
794 case NL80211_CHAN_WIDTH_10
:
795 case NL80211_CHAN_WIDTH_20_NOHT
:
796 sta_flags
|= IEEE80211_STA_DISABLE_HT
;
798 case NL80211_CHAN_WIDTH_20
:
799 sta_flags
|= IEEE80211_STA_DISABLE_40MHZ
;
805 memset(¶ms
, 0, sizeof(params
));
806 memset(&csa_ie
, 0, sizeof(csa_ie
));
807 err
= ieee80211_parse_ch_switch_ie(sdata
, elems
, beacon
,
808 ifibss
->chandef
.chan
->band
,
809 sta_flags
, ifibss
->bssid
, &csa_ie
);
810 /* can't switch to destination channel, fail */
814 /* did not contain a CSA */
818 /* channel switch is not supported, disconnect */
819 if (!(sdata
->local
->hw
.wiphy
->flags
& WIPHY_FLAG_HAS_CHANNEL_SWITCH
))
822 params
.count
= csa_ie
.count
;
823 params
.chandef
= csa_ie
.chandef
;
825 switch (ifibss
->chandef
.width
) {
826 case NL80211_CHAN_WIDTH_20_NOHT
:
827 case NL80211_CHAN_WIDTH_20
:
828 case NL80211_CHAN_WIDTH_40
:
829 /* keep our current HT mode (HT20/HT40+/HT40-), even if
830 * another mode has been announced. The mode is not adopted
831 * within the beacon while doing CSA and we should therefore
832 * keep the mode which we announce.
834 ch_type
= cfg80211_get_chandef_type(&ifibss
->chandef
);
835 cfg80211_chandef_create(¶ms
.chandef
, params
.chandef
.chan
,
838 case NL80211_CHAN_WIDTH_5
:
839 case NL80211_CHAN_WIDTH_10
:
840 if (params
.chandef
.width
!= ifibss
->chandef
.width
) {
842 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
844 params
.chandef
.chan
->center_freq
,
845 params
.chandef
.width
,
846 params
.chandef
.center_freq1
,
847 params
.chandef
.center_freq2
);
852 /* should not happen, sta_flags should prevent VHT modes. */
857 if (!cfg80211_reg_can_beacon(sdata
->local
->hw
.wiphy
, ¶ms
.chandef
,
858 NL80211_IFTYPE_ADHOC
)) {
860 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
862 params
.chandef
.chan
->center_freq
,
863 params
.chandef
.width
,
864 params
.chandef
.center_freq1
,
865 params
.chandef
.center_freq2
);
869 err
= cfg80211_chandef_dfs_required(sdata
->local
->hw
.wiphy
,
871 NL80211_IFTYPE_ADHOC
);
874 if (err
> 0 && !ifibss
->userspace_handles_dfs
) {
875 /* IBSS-DFS only allowed with a control program */
879 params
.radar_required
= err
;
881 if (cfg80211_chandef_identical(¶ms
.chandef
,
882 &sdata
->vif
.bss_conf
.chandef
)) {
884 "received csa with an identical chandef, ignoring\n");
888 /* all checks done, now perform the channel switch. */
890 "received channel switch announcement to go to channel %d MHz\n",
891 params
.chandef
.chan
->center_freq
);
893 params
.block_tx
= !!csa_ie
.mode
;
895 if (ieee80211_channel_switch(sdata
->local
->hw
.wiphy
, sdata
->dev
,
899 ieee80211_ibss_csa_mark_radar(sdata
);
903 ibss_dbg(sdata
, "Can't handle channel switch, disconnect\n");
904 ieee80211_queue_work(&sdata
->local
->hw
,
905 &ifibss
->csa_connection_drop_work
);
907 ieee80211_ibss_csa_mark_radar(sdata
);
913 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data
*sdata
,
914 struct ieee80211_mgmt
*mgmt
, size_t len
,
915 struct ieee80211_rx_status
*rx_status
,
916 struct ieee802_11_elems
*elems
)
920 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
923 /* CSA is the only action we handle for now */
924 if (mgmt
->u
.action
.u
.measurement
.action_code
!=
925 WLAN_ACTION_SPCT_CHL_SWITCH
)
928 required_len
= IEEE80211_MIN_ACTION_SIZE
+
929 sizeof(mgmt
->u
.action
.u
.chan_switch
);
930 if (len
< required_len
)
933 if (!sdata
->vif
.csa_active
)
934 ieee80211_ibss_process_chanswitch(sdata
, elems
, false);
937 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data
*sdata
,
938 struct ieee80211_mgmt
*mgmt
,
941 u16 reason
= le16_to_cpu(mgmt
->u
.deauth
.reason_code
);
943 if (len
< IEEE80211_DEAUTH_FRAME_LEN
)
946 ibss_dbg(sdata
, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
947 mgmt
->sa
, mgmt
->da
, mgmt
->bssid
, reason
);
948 sta_info_destroy_addr(sdata
, mgmt
->sa
);
951 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data
*sdata
,
952 struct ieee80211_mgmt
*mgmt
,
955 u16 auth_alg
, auth_transaction
;
957 sdata_assert_lock(sdata
);
962 auth_alg
= le16_to_cpu(mgmt
->u
.auth
.auth_alg
);
963 auth_transaction
= le16_to_cpu(mgmt
->u
.auth
.auth_transaction
);
966 "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
967 mgmt
->sa
, mgmt
->da
, mgmt
->bssid
, auth_transaction
);
969 if (auth_alg
!= WLAN_AUTH_OPEN
|| auth_transaction
!= 1)
973 * IEEE 802.11 standard does not require authentication in IBSS
974 * networks and most implementations do not seem to use it.
975 * However, try to reply to authentication attempts if someone
976 * has actually implemented this.
978 ieee80211_send_auth(sdata
, 2, WLAN_AUTH_OPEN
, 0, NULL
, 0,
979 mgmt
->sa
, sdata
->u
.ibss
.bssid
, NULL
, 0, 0, 0);
982 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data
*sdata
,
983 struct ieee80211_mgmt
*mgmt
, size_t len
,
984 struct ieee80211_rx_status
*rx_status
,
985 struct ieee802_11_elems
*elems
)
987 struct ieee80211_local
*local
= sdata
->local
;
988 struct cfg80211_bss
*cbss
;
989 struct ieee80211_bss
*bss
;
990 struct sta_info
*sta
;
991 struct ieee80211_channel
*channel
;
992 u64 beacon_timestamp
, rx_timestamp
;
994 enum ieee80211_band band
= rx_status
->band
;
995 enum nl80211_bss_scan_width scan_width
;
996 struct ieee80211_supported_band
*sband
= local
->hw
.wiphy
->bands
[band
];
997 bool rates_updated
= false;
999 channel
= ieee80211_get_channel(local
->hw
.wiphy
, rx_status
->freq
);
1003 if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
&&
1004 ether_addr_equal(mgmt
->bssid
, sdata
->u
.ibss
.bssid
)) {
1007 sta
= sta_info_get(sdata
, mgmt
->sa
);
1009 if (elems
->supp_rates
) {
1010 supp_rates
= ieee80211_sta_get_rates(sdata
, elems
,
1015 prev_rates
= sta
->sta
.supp_rates
[band
];
1016 /* make sure mandatory rates are always added */
1017 scan_width
= NL80211_BSS_CHAN_WIDTH_20
;
1018 if (rx_status
->flag
& RX_FLAG_5MHZ
)
1019 scan_width
= NL80211_BSS_CHAN_WIDTH_5
;
1020 if (rx_status
->flag
& RX_FLAG_10MHZ
)
1021 scan_width
= NL80211_BSS_CHAN_WIDTH_10
;
1023 sta
->sta
.supp_rates
[band
] = supp_rates
|
1024 ieee80211_mandatory_rates(sband
,
1026 if (sta
->sta
.supp_rates
[band
] != prev_rates
) {
1028 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1029 sta
->sta
.addr
, prev_rates
,
1030 sta
->sta
.supp_rates
[band
]);
1031 rates_updated
= true;
1035 sta
= ieee80211_ibss_add_sta(sdata
, mgmt
->bssid
,
1036 mgmt
->sa
, supp_rates
);
1040 if (sta
&& elems
->wmm_info
)
1041 set_sta_flag(sta
, WLAN_STA_WME
);
1043 if (sta
&& elems
->ht_operation
&& elems
->ht_cap_elem
&&
1044 sdata
->u
.ibss
.chandef
.width
!= NL80211_CHAN_WIDTH_20_NOHT
&&
1045 sdata
->u
.ibss
.chandef
.width
!= NL80211_CHAN_WIDTH_5
&&
1046 sdata
->u
.ibss
.chandef
.width
!= NL80211_CHAN_WIDTH_10
) {
1047 /* we both use HT */
1048 struct ieee80211_ht_cap htcap_ie
;
1049 struct cfg80211_chan_def chandef
;
1051 ieee80211_ht_oper_to_chandef(channel
,
1052 elems
->ht_operation
,
1055 memcpy(&htcap_ie
, elems
->ht_cap_elem
, sizeof(htcap_ie
));
1058 * fall back to HT20 if we don't use or use
1059 * the other extension channel
1061 if (chandef
.center_freq1
!=
1062 sdata
->u
.ibss
.chandef
.center_freq1
)
1063 htcap_ie
.cap_info
&=
1064 cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40
);
1066 rates_updated
|= ieee80211_ht_cap_ie_to_sta_ht_cap(
1067 sdata
, sband
, &htcap_ie
, sta
);
1070 if (sta
&& rates_updated
) {
1071 drv_sta_rc_update(local
, sdata
, &sta
->sta
,
1072 IEEE80211_RC_SUPP_RATES_CHANGED
);
1073 rate_control_rate_init(sta
);
1079 bss
= ieee80211_bss_info_update(local
, rx_status
, mgmt
, len
, elems
,
1084 cbss
= container_of((void *)bss
, struct cfg80211_bss
, priv
);
1086 /* same for beacon and probe response */
1087 beacon_timestamp
= le64_to_cpu(mgmt
->u
.beacon
.timestamp
);
1089 /* check if we need to merge IBSS */
1092 if (!(cbss
->capability
& WLAN_CAPABILITY_IBSS
))
1095 /* different channel */
1096 if (sdata
->u
.ibss
.fixed_channel
&&
1097 sdata
->u
.ibss
.chandef
.chan
!= cbss
->channel
)
1100 /* different SSID */
1101 if (elems
->ssid_len
!= sdata
->u
.ibss
.ssid_len
||
1102 memcmp(elems
->ssid
, sdata
->u
.ibss
.ssid
,
1103 sdata
->u
.ibss
.ssid_len
))
1106 /* process channel switch */
1107 if (sdata
->vif
.csa_active
||
1108 ieee80211_ibss_process_chanswitch(sdata
, elems
, true))
1112 if (ether_addr_equal(cbss
->bssid
, sdata
->u
.ibss
.bssid
))
1115 /* we use a fixed BSSID */
1116 if (sdata
->u
.ibss
.fixed_bssid
)
1119 if (ieee80211_have_rx_timestamp(rx_status
)) {
1120 /* time when timestamp field was received */
1122 ieee80211_calculate_rx_timestamp(local
, rx_status
,
1126 * second best option: get current TSF
1127 * (will return -1 if not supported)
1129 rx_timestamp
= drv_get_tsf(local
, sdata
);
1133 "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1134 mgmt
->sa
, mgmt
->bssid
,
1135 (unsigned long long)rx_timestamp
,
1136 (unsigned long long)beacon_timestamp
,
1137 (unsigned long long)(rx_timestamp
- beacon_timestamp
),
1140 if (beacon_timestamp
> rx_timestamp
) {
1142 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1144 ieee80211_sta_join_ibss(sdata
, bss
);
1145 supp_rates
= ieee80211_sta_get_rates(sdata
, elems
, band
, NULL
);
1146 ieee80211_ibss_add_sta(sdata
, mgmt
->bssid
, mgmt
->sa
,
1152 ieee80211_rx_bss_put(local
, bss
);
1155 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data
*sdata
,
1156 const u8
*bssid
, const u8
*addr
,
1159 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
1160 struct ieee80211_local
*local
= sdata
->local
;
1161 struct sta_info
*sta
;
1162 struct ieee80211_chanctx_conf
*chanctx_conf
;
1163 struct ieee80211_supported_band
*sband
;
1164 enum nl80211_bss_scan_width scan_width
;
1168 * XXX: Consider removing the least recently used entry and
1169 * allow new one to be added.
1171 if (local
->num_sta
>= IEEE80211_IBSS_MAX_STA_ENTRIES
) {
1172 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1177 if (ifibss
->state
== IEEE80211_IBSS_MLME_SEARCH
)
1180 if (!ether_addr_equal(bssid
, sdata
->u
.ibss
.bssid
))
1184 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
1185 if (WARN_ON_ONCE(!chanctx_conf
)) {
1189 band
= chanctx_conf
->def
.chan
->band
;
1190 scan_width
= cfg80211_chandef_to_scan_width(&chanctx_conf
->def
);
1193 sta
= sta_info_alloc(sdata
, addr
, GFP_ATOMIC
);
1197 sta
->last_rx
= jiffies
;
1199 /* make sure mandatory rates are always added */
1200 sband
= local
->hw
.wiphy
->bands
[band
];
1201 sta
->sta
.supp_rates
[band
] = supp_rates
|
1202 ieee80211_mandatory_rates(sband
, scan_width
);
1204 spin_lock(&ifibss
->incomplete_lock
);
1205 list_add(&sta
->list
, &ifibss
->incomplete_stations
);
1206 spin_unlock(&ifibss
->incomplete_lock
);
1207 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
1210 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data
*sdata
)
1212 struct ieee80211_local
*local
= sdata
->local
;
1213 struct sta_info
*sta
, *tmp
;
1214 unsigned long exp_time
= IEEE80211_IBSS_INACTIVITY_LIMIT
;
1215 unsigned long exp_rsn_time
= IEEE80211_IBSS_RSN_INACTIVITY_LIMIT
;
1217 mutex_lock(&local
->sta_mtx
);
1219 list_for_each_entry_safe(sta
, tmp
, &local
->sta_list
, list
) {
1220 if (sdata
!= sta
->sdata
)
1223 if (time_after(jiffies
, sta
->last_rx
+ exp_time
) ||
1224 (time_after(jiffies
, sta
->last_rx
+ exp_rsn_time
) &&
1225 sta
->sta_state
!= IEEE80211_STA_AUTHORIZED
)) {
1226 sta_dbg(sta
->sdata
, "expiring inactive %sSTA %pM\n",
1227 sta
->sta_state
!= IEEE80211_STA_AUTHORIZED
?
1228 "not authorized " : "", sta
->sta
.addr
);
1230 WARN_ON(__sta_info_destroy(sta
));
1234 mutex_unlock(&local
->sta_mtx
);
1238 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1241 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data
*sdata
)
1243 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
1244 enum nl80211_bss_scan_width scan_width
;
1246 sdata_assert_lock(sdata
);
1248 mod_timer(&ifibss
->timer
,
1249 round_jiffies(jiffies
+ IEEE80211_IBSS_MERGE_INTERVAL
));
1251 ieee80211_ibss_sta_expire(sdata
);
1253 if (time_before(jiffies
, ifibss
->last_scan_completed
+
1254 IEEE80211_IBSS_MERGE_INTERVAL
))
1257 if (ieee80211_sta_active_ibss(sdata
))
1260 if (ifibss
->fixed_channel
)
1264 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1266 scan_width
= cfg80211_chandef_to_scan_width(&ifibss
->chandef
);
1267 ieee80211_request_ibss_scan(sdata
, ifibss
->ssid
, ifibss
->ssid_len
,
1271 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data
*sdata
)
1273 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
1278 sdata_assert_lock(sdata
);
1280 if (ifibss
->fixed_bssid
) {
1281 memcpy(bssid
, ifibss
->bssid
, ETH_ALEN
);
1283 /* Generate random, not broadcast, locally administered BSSID. Mix in
1284 * own MAC address to make sure that devices that do not have proper
1285 * random number generator get different BSSID. */
1286 get_random_bytes(bssid
, ETH_ALEN
);
1287 for (i
= 0; i
< ETH_ALEN
; i
++)
1288 bssid
[i
] ^= sdata
->vif
.addr
[i
];
1293 sdata_info(sdata
, "Creating new IBSS network, BSSID %pM\n", bssid
);
1295 capability
= WLAN_CAPABILITY_IBSS
;
1297 if (ifibss
->privacy
)
1298 capability
|= WLAN_CAPABILITY_PRIVACY
;
1300 sdata
->drop_unencrypted
= 0;
1302 __ieee80211_sta_join_ibss(sdata
, bssid
, sdata
->vif
.bss_conf
.beacon_int
,
1303 &ifibss
->chandef
, ifibss
->basic_rates
,
1304 capability
, 0, true);
1308 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1311 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data
*sdata
)
1313 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
1314 struct ieee80211_local
*local
= sdata
->local
;
1315 struct cfg80211_bss
*cbss
;
1316 struct ieee80211_channel
*chan
= NULL
;
1317 const u8
*bssid
= NULL
;
1318 enum nl80211_bss_scan_width scan_width
;
1322 sdata_assert_lock(sdata
);
1324 active_ibss
= ieee80211_sta_active_ibss(sdata
);
1325 ibss_dbg(sdata
, "sta_find_ibss (active_ibss=%d)\n", active_ibss
);
1330 capability
= WLAN_CAPABILITY_IBSS
;
1331 if (ifibss
->privacy
)
1332 capability
|= WLAN_CAPABILITY_PRIVACY
;
1333 if (ifibss
->fixed_bssid
)
1334 bssid
= ifibss
->bssid
;
1335 if (ifibss
->fixed_channel
)
1336 chan
= ifibss
->chandef
.chan
;
1337 if (!is_zero_ether_addr(ifibss
->bssid
))
1338 bssid
= ifibss
->bssid
;
1339 cbss
= cfg80211_get_bss(local
->hw
.wiphy
, chan
, bssid
,
1340 ifibss
->ssid
, ifibss
->ssid_len
,
1341 WLAN_CAPABILITY_IBSS
| WLAN_CAPABILITY_PRIVACY
,
1345 struct ieee80211_bss
*bss
;
1347 bss
= (void *)cbss
->priv
;
1349 "sta_find_ibss: selected %pM current %pM\n",
1350 cbss
->bssid
, ifibss
->bssid
);
1352 "Selected IBSS BSSID %pM based on configured SSID\n",
1355 ieee80211_sta_join_ibss(sdata
, bss
);
1356 ieee80211_rx_bss_put(local
, bss
);
1360 /* if a fixed bssid and a fixed freq have been provided create the IBSS
1361 * directly and do not waste time scanning
1363 if (ifibss
->fixed_bssid
&& ifibss
->fixed_channel
) {
1364 sdata_info(sdata
, "Created IBSS using preconfigured BSSID %pM\n",
1366 ieee80211_sta_create_ibss(sdata
);
1371 ibss_dbg(sdata
, "sta_find_ibss: did not try to join ibss\n");
1373 /* Selected IBSS not found in current scan results - try to scan */
1374 if (time_after(jiffies
, ifibss
->last_scan_completed
+
1375 IEEE80211_SCAN_INTERVAL
)) {
1376 sdata_info(sdata
, "Trigger new scan to find an IBSS to join\n");
1378 scan_width
= cfg80211_chandef_to_scan_width(&ifibss
->chandef
);
1379 ieee80211_request_ibss_scan(sdata
, ifibss
->ssid
,
1380 ifibss
->ssid_len
, chan
,
1383 int interval
= IEEE80211_SCAN_INTERVAL
;
1385 if (time_after(jiffies
, ifibss
->ibss_join_req
+
1386 IEEE80211_IBSS_JOIN_TIMEOUT
))
1387 ieee80211_sta_create_ibss(sdata
);
1389 mod_timer(&ifibss
->timer
,
1390 round_jiffies(jiffies
+ interval
));
1394 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data
*sdata
,
1395 struct sk_buff
*req
)
1397 struct ieee80211_mgmt
*mgmt
= (void *)req
->data
;
1398 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
1399 struct ieee80211_local
*local
= sdata
->local
;
1400 int tx_last_beacon
, len
= req
->len
;
1401 struct sk_buff
*skb
;
1402 struct beacon_data
*presp
;
1405 sdata_assert_lock(sdata
);
1407 presp
= rcu_dereference_protected(ifibss
->presp
,
1408 lockdep_is_held(&sdata
->wdev
.mtx
));
1410 if (ifibss
->state
!= IEEE80211_IBSS_MLME_JOINED
||
1411 len
< 24 + 2 || !presp
)
1414 tx_last_beacon
= drv_tx_last_beacon(local
);
1417 "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
1418 mgmt
->sa
, mgmt
->da
, mgmt
->bssid
, tx_last_beacon
);
1420 if (!tx_last_beacon
&& is_multicast_ether_addr(mgmt
->da
))
1423 if (!ether_addr_equal(mgmt
->bssid
, ifibss
->bssid
) &&
1424 !is_broadcast_ether_addr(mgmt
->bssid
))
1427 end
= ((u8
*) mgmt
) + len
;
1428 pos
= mgmt
->u
.probe_req
.variable
;
1429 if (pos
[0] != WLAN_EID_SSID
||
1430 pos
+ 2 + pos
[1] > end
) {
1431 ibss_dbg(sdata
, "Invalid SSID IE in ProbeReq from %pM\n",
1436 (pos
[1] != ifibss
->ssid_len
||
1437 memcmp(pos
+ 2, ifibss
->ssid
, ifibss
->ssid_len
))) {
1438 /* Ignore ProbeReq for foreign SSID */
1442 /* Reply with ProbeResp */
1443 skb
= dev_alloc_skb(local
->tx_headroom
+ presp
->head_len
);
1447 skb_reserve(skb
, local
->tx_headroom
);
1448 memcpy(skb_put(skb
, presp
->head_len
), presp
->head
, presp
->head_len
);
1450 memcpy(((struct ieee80211_mgmt
*) skb
->data
)->da
, mgmt
->sa
, ETH_ALEN
);
1451 ibss_dbg(sdata
, "Sending ProbeResp to %pM\n", mgmt
->sa
);
1452 IEEE80211_SKB_CB(skb
)->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
1454 /* avoid excessive retries for probe request to wildcard SSIDs */
1456 IEEE80211_SKB_CB(skb
)->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1458 ieee80211_tx_skb(sdata
, skb
);
1462 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data
*sdata
,
1463 struct ieee80211_mgmt
*mgmt
, size_t len
,
1464 struct ieee80211_rx_status
*rx_status
)
1467 struct ieee802_11_elems elems
;
1469 BUILD_BUG_ON(offsetof(typeof(mgmt
->u
.probe_resp
), variable
) !=
1470 offsetof(typeof(mgmt
->u
.beacon
), variable
));
1473 * either beacon or probe_resp but the variable field is at the
1476 baselen
= (u8
*) mgmt
->u
.probe_resp
.variable
- (u8
*) mgmt
;
1480 ieee802_11_parse_elems(mgmt
->u
.probe_resp
.variable
, len
- baselen
,
1483 ieee80211_rx_bss_info(sdata
, mgmt
, len
, rx_status
, &elems
);
1486 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data
*sdata
,
1487 struct sk_buff
*skb
)
1489 struct ieee80211_rx_status
*rx_status
;
1490 struct ieee80211_mgmt
*mgmt
;
1492 struct ieee802_11_elems elems
;
1495 rx_status
= IEEE80211_SKB_RXCB(skb
);
1496 mgmt
= (struct ieee80211_mgmt
*) skb
->data
;
1497 fc
= le16_to_cpu(mgmt
->frame_control
);
1501 if (!sdata
->u
.ibss
.ssid_len
)
1502 goto mgmt_out
; /* not ready to merge yet */
1504 switch (fc
& IEEE80211_FCTL_STYPE
) {
1505 case IEEE80211_STYPE_PROBE_REQ
:
1506 ieee80211_rx_mgmt_probe_req(sdata
, skb
);
1508 case IEEE80211_STYPE_PROBE_RESP
:
1509 case IEEE80211_STYPE_BEACON
:
1510 ieee80211_rx_mgmt_probe_beacon(sdata
, mgmt
, skb
->len
,
1513 case IEEE80211_STYPE_AUTH
:
1514 ieee80211_rx_mgmt_auth_ibss(sdata
, mgmt
, skb
->len
);
1516 case IEEE80211_STYPE_DEAUTH
:
1517 ieee80211_rx_mgmt_deauth_ibss(sdata
, mgmt
, skb
->len
);
1519 case IEEE80211_STYPE_ACTION
:
1520 switch (mgmt
->u
.action
.category
) {
1521 case WLAN_CATEGORY_SPECTRUM_MGMT
:
1522 ies_len
= skb
->len
-
1523 offsetof(struct ieee80211_mgmt
,
1524 u
.action
.u
.chan_switch
.variable
);
1529 ieee802_11_parse_elems(
1530 mgmt
->u
.action
.u
.chan_switch
.variable
,
1531 ies_len
, true, &elems
);
1533 if (elems
.parse_error
)
1536 ieee80211_rx_mgmt_spectrum_mgmt(sdata
, mgmt
, skb
->len
,
1543 sdata_unlock(sdata
);
1546 void ieee80211_ibss_work(struct ieee80211_sub_if_data
*sdata
)
1548 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
1549 struct sta_info
*sta
;
1554 * Work could be scheduled after scan or similar
1555 * when we aren't even joined (or trying) with a
1558 if (!ifibss
->ssid_len
)
1561 spin_lock_bh(&ifibss
->incomplete_lock
);
1562 while (!list_empty(&ifibss
->incomplete_stations
)) {
1563 sta
= list_first_entry(&ifibss
->incomplete_stations
,
1564 struct sta_info
, list
);
1565 list_del(&sta
->list
);
1566 spin_unlock_bh(&ifibss
->incomplete_lock
);
1568 ieee80211_ibss_finish_sta(sta
);
1570 spin_lock_bh(&ifibss
->incomplete_lock
);
1572 spin_unlock_bh(&ifibss
->incomplete_lock
);
1574 switch (ifibss
->state
) {
1575 case IEEE80211_IBSS_MLME_SEARCH
:
1576 ieee80211_sta_find_ibss(sdata
);
1578 case IEEE80211_IBSS_MLME_JOINED
:
1579 ieee80211_sta_merge_ibss(sdata
);
1587 sdata_unlock(sdata
);
1590 static void ieee80211_ibss_timer(unsigned long data
)
1592 struct ieee80211_sub_if_data
*sdata
=
1593 (struct ieee80211_sub_if_data
*) data
;
1595 ieee80211_queue_work(&sdata
->local
->hw
, &sdata
->work
);
1598 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data
*sdata
)
1600 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
1602 setup_timer(&ifibss
->timer
, ieee80211_ibss_timer
,
1603 (unsigned long) sdata
);
1604 INIT_LIST_HEAD(&ifibss
->incomplete_stations
);
1605 spin_lock_init(&ifibss
->incomplete_lock
);
1606 INIT_WORK(&ifibss
->csa_connection_drop_work
,
1607 ieee80211_csa_connection_drop_work
);
1610 /* scan finished notification */
1611 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local
*local
)
1613 struct ieee80211_sub_if_data
*sdata
;
1615 mutex_lock(&local
->iflist_mtx
);
1616 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
1617 if (!ieee80211_sdata_running(sdata
))
1619 if (sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
1621 sdata
->u
.ibss
.last_scan_completed
= jiffies
;
1622 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
1624 mutex_unlock(&local
->iflist_mtx
);
1627 int ieee80211_ibss_join(struct ieee80211_sub_if_data
*sdata
,
1628 struct cfg80211_ibss_params
*params
)
1632 struct ieee80211_supported_band
*sband
;
1633 enum ieee80211_chanctx_mode chanmode
;
1634 struct ieee80211_local
*local
= sdata
->local
;
1635 int radar_detect_width
= 0;
1639 ret
= cfg80211_chandef_dfs_required(local
->hw
.wiphy
,
1641 sdata
->wdev
.iftype
);
1646 if (!params
->userspace_handles_dfs
)
1648 radar_detect_width
= BIT(params
->chandef
.width
);
1651 chanmode
= (params
->channel_fixed
&& !ret
) ?
1652 IEEE80211_CHANCTX_SHARED
: IEEE80211_CHANCTX_EXCLUSIVE
;
1654 mutex_lock(&local
->chanctx_mtx
);
1655 ret
= ieee80211_check_combinations(sdata
, ¶ms
->chandef
, chanmode
,
1656 radar_detect_width
);
1657 mutex_unlock(&local
->chanctx_mtx
);
1661 if (params
->bssid
) {
1662 memcpy(sdata
->u
.ibss
.bssid
, params
->bssid
, ETH_ALEN
);
1663 sdata
->u
.ibss
.fixed_bssid
= true;
1665 sdata
->u
.ibss
.fixed_bssid
= false;
1667 sdata
->u
.ibss
.privacy
= params
->privacy
;
1668 sdata
->u
.ibss
.control_port
= params
->control_port
;
1669 sdata
->u
.ibss
.userspace_handles_dfs
= params
->userspace_handles_dfs
;
1670 sdata
->u
.ibss
.basic_rates
= params
->basic_rates
;
1671 sdata
->u
.ibss
.last_scan_completed
= jiffies
;
1673 /* fix basic_rates if channel does not support these rates */
1674 rate_flags
= ieee80211_chandef_rate_flags(¶ms
->chandef
);
1675 sband
= local
->hw
.wiphy
->bands
[params
->chandef
.chan
->band
];
1676 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
1677 if ((rate_flags
& sband
->bitrates
[i
].flags
) != rate_flags
)
1678 sdata
->u
.ibss
.basic_rates
&= ~BIT(i
);
1680 memcpy(sdata
->vif
.bss_conf
.mcast_rate
, params
->mcast_rate
,
1681 sizeof(params
->mcast_rate
));
1683 sdata
->vif
.bss_conf
.beacon_int
= params
->beacon_interval
;
1685 sdata
->u
.ibss
.chandef
= params
->chandef
;
1686 sdata
->u
.ibss
.fixed_channel
= params
->channel_fixed
;
1689 sdata
->u
.ibss
.ie
= kmemdup(params
->ie
, params
->ie_len
,
1691 if (sdata
->u
.ibss
.ie
)
1692 sdata
->u
.ibss
.ie_len
= params
->ie_len
;
1695 sdata
->u
.ibss
.state
= IEEE80211_IBSS_MLME_SEARCH
;
1696 sdata
->u
.ibss
.ibss_join_req
= jiffies
;
1698 memcpy(sdata
->u
.ibss
.ssid
, params
->ssid
, params
->ssid_len
);
1699 sdata
->u
.ibss
.ssid_len
= params
->ssid_len
;
1701 memcpy(&sdata
->u
.ibss
.ht_capa
, ¶ms
->ht_capa
,
1702 sizeof(sdata
->u
.ibss
.ht_capa
));
1703 memcpy(&sdata
->u
.ibss
.ht_capa_mask
, ¶ms
->ht_capa_mask
,
1704 sizeof(sdata
->u
.ibss
.ht_capa_mask
));
1707 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1708 * reserved, but an HT STA shall protect HT transmissions as though
1709 * the HT Protection field were set to non-HT mixed mode.
1711 * In an IBSS, the RIFS Mode field of the HT Operation element is
1712 * also reserved, but an HT STA shall operate as though this field
1716 sdata
->vif
.bss_conf
.ht_operation_mode
|=
1717 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1718 | IEEE80211_HT_PARAM_RIFS_MODE
;
1720 changed
|= BSS_CHANGED_HT
;
1721 ieee80211_bss_info_change_notify(sdata
, changed
);
1723 sdata
->smps_mode
= IEEE80211_SMPS_OFF
;
1724 sdata
->needed_rx_chains
= local
->rx_chains
;
1726 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
1731 int ieee80211_ibss_leave(struct ieee80211_sub_if_data
*sdata
)
1733 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
1735 ieee80211_ibss_disconnect(sdata
);
1736 ifibss
->ssid_len
= 0;
1737 memset(ifibss
->bssid
, 0, ETH_ALEN
);
1740 kfree(sdata
->u
.ibss
.ie
);
1742 /* on the next join, re-program HT parameters */
1743 memset(&ifibss
->ht_capa
, 0, sizeof(ifibss
->ht_capa
));
1744 memset(&ifibss
->ht_capa_mask
, 0, sizeof(ifibss
->ht_capa_mask
));
1748 skb_queue_purge(&sdata
->skb_queue
);
1750 del_timer_sync(&sdata
->u
.ibss
.timer
);