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 sdata
->csa_counter_offset_beacon
= (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
++ = WLAN_EID_VENDOR_SPECIFIC
;
194 *pos
++ = 7; /* len */
195 *pos
++ = 0x00; /* Microsoft OUI 00:50:F2 */
198 *pos
++ = 2; /* WME */
199 *pos
++ = 0; /* WME info */
200 *pos
++ = 1; /* WME ver */
201 *pos
++ = 0; /* U-APSD no in use */
204 presp
->head_len
= pos
- presp
->head
;
205 if (WARN_ON(presp
->head_len
> frame_len
))
214 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data
*sdata
,
215 const u8
*bssid
, const int beacon_int
,
216 struct cfg80211_chan_def
*req_chandef
,
217 const u32 basic_rates
,
218 const u16 capability
, u64 tsf
,
221 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
222 struct ieee80211_local
*local
= sdata
->local
;
223 struct ieee80211_supported_band
*sband
;
224 struct ieee80211_mgmt
*mgmt
;
225 struct cfg80211_bss
*bss
;
227 struct cfg80211_chan_def chandef
;
228 struct ieee80211_channel
*chan
;
229 struct beacon_data
*presp
;
230 enum nl80211_bss_scan_width scan_width
;
231 bool have_higher_than_11mbit
;
232 bool radar_required
= false;
235 sdata_assert_lock(sdata
);
237 /* Reset own TSF to allow time synchronization work. */
238 drv_reset_tsf(local
, sdata
);
240 if (!ether_addr_equal(ifibss
->bssid
, bssid
))
241 sta_info_flush(sdata
);
243 /* if merging, indicate to driver that we leave the old IBSS */
244 if (sdata
->vif
.bss_conf
.ibss_joined
) {
245 sdata
->vif
.bss_conf
.ibss_joined
= false;
246 sdata
->vif
.bss_conf
.ibss_creator
= false;
247 sdata
->vif
.bss_conf
.enable_beacon
= false;
248 netif_carrier_off(sdata
->dev
);
249 ieee80211_bss_info_change_notify(sdata
,
251 BSS_CHANGED_BEACON_ENABLED
);
252 drv_leave_ibss(local
, sdata
);
255 presp
= rcu_dereference_protected(ifibss
->presp
,
256 lockdep_is_held(&sdata
->wdev
.mtx
));
257 rcu_assign_pointer(ifibss
->presp
, NULL
);
259 kfree_rcu(presp
, rcu_head
);
261 sdata
->drop_unencrypted
= capability
& WLAN_CAPABILITY_PRIVACY
? 1 : 0;
263 /* make a copy of the chandef, it could be modified below. */
264 chandef
= *req_chandef
;
266 if (!cfg80211_reg_can_beacon(local
->hw
.wiphy
, &chandef
)) {
267 if (chandef
.width
== NL80211_CHAN_WIDTH_5
||
268 chandef
.width
== NL80211_CHAN_WIDTH_10
||
269 chandef
.width
== NL80211_CHAN_WIDTH_20_NOHT
||
270 chandef
.width
== NL80211_CHAN_WIDTH_20
) {
272 "Failed to join IBSS, beacons forbidden\n");
275 chandef
.width
= NL80211_CHAN_WIDTH_20
;
276 chandef
.center_freq1
= chan
->center_freq
;
277 /* check again for downgraded chandef */
278 if (!cfg80211_reg_can_beacon(local
->hw
.wiphy
, &chandef
)) {
280 "Failed to join IBSS, beacons forbidden\n");
285 err
= cfg80211_chandef_dfs_required(sdata
->local
->hw
.wiphy
,
288 if (!ifibss
->userspace_handles_dfs
) {
290 "Failed to join IBSS, DFS channel without control program\n");
293 radar_required
= true;
296 ieee80211_vif_release_channel(sdata
);
297 if (ieee80211_vif_use_channel(sdata
, &chandef
,
298 ifibss
->fixed_channel
?
299 IEEE80211_CHANCTX_SHARED
:
300 IEEE80211_CHANCTX_EXCLUSIVE
)) {
301 sdata_info(sdata
, "Failed to join IBSS, no channel context\n");
305 memcpy(ifibss
->bssid
, bssid
, ETH_ALEN
);
307 sband
= local
->hw
.wiphy
->bands
[chan
->band
];
309 presp
= ieee80211_ibss_build_presp(sdata
, beacon_int
, basic_rates
,
310 capability
, tsf
, &chandef
,
311 &have_higher_than_11mbit
, NULL
);
315 rcu_assign_pointer(ifibss
->presp
, presp
);
316 mgmt
= (void *)presp
->head
;
318 sdata
->radar_required
= radar_required
;
319 sdata
->vif
.bss_conf
.enable_beacon
= true;
320 sdata
->vif
.bss_conf
.beacon_int
= beacon_int
;
321 sdata
->vif
.bss_conf
.basic_rates
= basic_rates
;
322 sdata
->vif
.bss_conf
.ssid_len
= ifibss
->ssid_len
;
323 memcpy(sdata
->vif
.bss_conf
.ssid
, ifibss
->ssid
, ifibss
->ssid_len
);
324 bss_change
= BSS_CHANGED_BEACON_INT
;
325 bss_change
|= ieee80211_reset_erp_info(sdata
);
326 bss_change
|= BSS_CHANGED_BSSID
;
327 bss_change
|= BSS_CHANGED_BEACON
;
328 bss_change
|= BSS_CHANGED_BEACON_ENABLED
;
329 bss_change
|= BSS_CHANGED_BASIC_RATES
;
330 bss_change
|= BSS_CHANGED_HT
;
331 bss_change
|= BSS_CHANGED_IBSS
;
332 bss_change
|= BSS_CHANGED_SSID
;
335 * In 5 GHz/802.11a, we can always use short slot time.
336 * (IEEE 802.11-2012 18.3.8.7)
338 * In 2.4GHz, we must always use long slots in IBSS for compatibility
340 * (IEEE 802.11-2012 19.4.5)
342 * HT follows these specifications (IEEE 802.11-2012 20.3.18)
344 sdata
->vif
.bss_conf
.use_short_slot
= chan
->band
== IEEE80211_BAND_5GHZ
;
345 bss_change
|= BSS_CHANGED_ERP_SLOT
;
347 /* cf. IEEE 802.11 9.2.12 */
348 if (chan
->band
== IEEE80211_BAND_2GHZ
&& have_higher_than_11mbit
)
349 sdata
->flags
|= IEEE80211_SDATA_OPERATING_GMODE
;
351 sdata
->flags
&= ~IEEE80211_SDATA_OPERATING_GMODE
;
353 ieee80211_set_wmm_default(sdata
, true);
355 sdata
->vif
.bss_conf
.ibss_joined
= true;
356 sdata
->vif
.bss_conf
.ibss_creator
= creator
;
358 err
= drv_join_ibss(local
, sdata
);
360 sdata
->vif
.bss_conf
.ibss_joined
= false;
361 sdata
->vif
.bss_conf
.ibss_creator
= false;
362 sdata
->vif
.bss_conf
.enable_beacon
= false;
363 sdata
->vif
.bss_conf
.ssid_len
= 0;
364 RCU_INIT_POINTER(ifibss
->presp
, NULL
);
365 kfree_rcu(presp
, rcu_head
);
366 ieee80211_vif_release_channel(sdata
);
367 sdata_info(sdata
, "Failed to join IBSS, driver failure: %d\n",
372 ieee80211_bss_info_change_notify(sdata
, bss_change
);
374 ifibss
->state
= IEEE80211_IBSS_MLME_JOINED
;
375 mod_timer(&ifibss
->timer
,
376 round_jiffies(jiffies
+ IEEE80211_IBSS_MERGE_INTERVAL
));
378 scan_width
= cfg80211_chandef_to_scan_width(&chandef
);
379 bss
= cfg80211_inform_bss_width_frame(local
->hw
.wiphy
, chan
,
381 presp
->head_len
, 0, GFP_KERNEL
);
382 cfg80211_put_bss(local
->hw
.wiphy
, bss
);
383 netif_carrier_on(sdata
->dev
);
384 cfg80211_ibss_joined(sdata
->dev
, ifibss
->bssid
, GFP_KERNEL
);
387 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data
*sdata
,
388 struct ieee80211_bss
*bss
)
390 struct cfg80211_bss
*cbss
=
391 container_of((void *)bss
, struct cfg80211_bss
, priv
);
392 struct ieee80211_supported_band
*sband
;
393 struct cfg80211_chan_def chandef
;
396 u16 beacon_int
= cbss
->beacon_interval
;
397 const struct cfg80211_bss_ies
*ies
;
398 enum nl80211_channel_type chan_type
;
403 sdata_assert_lock(sdata
);
408 switch (sdata
->u
.ibss
.chandef
.width
) {
409 case NL80211_CHAN_WIDTH_20_NOHT
:
410 case NL80211_CHAN_WIDTH_20
:
411 case NL80211_CHAN_WIDTH_40
:
412 chan_type
= cfg80211_get_chandef_type(&sdata
->u
.ibss
.chandef
);
413 cfg80211_chandef_create(&chandef
, cbss
->channel
, chan_type
);
415 case NL80211_CHAN_WIDTH_5
:
416 case NL80211_CHAN_WIDTH_10
:
417 cfg80211_chandef_create(&chandef
, cbss
->channel
,
418 NL80211_CHAN_WIDTH_20_NOHT
);
419 chandef
.width
= sdata
->u
.ibss
.chandef
.width
;
422 /* fall back to 20 MHz for unsupported modes */
423 cfg80211_chandef_create(&chandef
, cbss
->channel
,
424 NL80211_CHAN_WIDTH_20_NOHT
);
428 sband
= sdata
->local
->hw
.wiphy
->bands
[cbss
->channel
->band
];
429 rate_flags
= ieee80211_chandef_rate_flags(&sdata
->u
.ibss
.chandef
);
430 shift
= ieee80211_vif_get_shift(&sdata
->vif
);
434 for (i
= 0; i
< bss
->supp_rates_len
; i
++) {
435 int rate
= bss
->supp_rates
[i
] & 0x7f;
436 bool is_basic
= !!(bss
->supp_rates
[i
] & 0x80);
438 for (j
= 0; j
< sband
->n_bitrates
; j
++) {
440 if ((rate_flags
& sband
->bitrates
[j
].flags
)
444 brate
= DIV_ROUND_UP(sband
->bitrates
[j
].bitrate
,
448 basic_rates
|= BIT(j
);
455 ies
= rcu_dereference(cbss
->ies
);
459 __ieee80211_sta_join_ibss(sdata
, cbss
->bssid
,
467 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data
*sdata
,
468 struct cfg80211_csa_settings
*csa_settings
)
470 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
471 struct beacon_data
*presp
, *old_presp
;
472 struct cfg80211_bss
*cbss
;
473 const struct cfg80211_bss_ies
*ies
;
478 sdata_assert_lock(sdata
);
480 capability
= WLAN_CAPABILITY_IBSS
;
483 capability
|= WLAN_CAPABILITY_PRIVACY
;
485 cbss
= cfg80211_get_bss(sdata
->local
->hw
.wiphy
, ifibss
->chandef
.chan
,
486 ifibss
->bssid
, ifibss
->ssid
,
487 ifibss
->ssid_len
, WLAN_CAPABILITY_IBSS
|
488 WLAN_CAPABILITY_PRIVACY
,
491 if (WARN_ON(!cbss
)) {
497 ies
= rcu_dereference(cbss
->ies
);
500 cfg80211_put_bss(sdata
->local
->hw
.wiphy
, cbss
);
502 old_presp
= rcu_dereference_protected(ifibss
->presp
,
503 lockdep_is_held(&sdata
->wdev
.mtx
));
505 presp
= ieee80211_ibss_build_presp(sdata
,
506 sdata
->vif
.bss_conf
.beacon_int
,
507 sdata
->vif
.bss_conf
.basic_rates
,
508 capability
, tsf
, &ifibss
->chandef
,
515 rcu_assign_pointer(ifibss
->presp
, presp
);
517 kfree_rcu(old_presp
, rcu_head
);
519 /* it might not send the beacon for a while. send an action frame
520 * immediately to announce the channel switch.
523 ieee80211_send_action_csa(sdata
, csa_settings
);
525 ieee80211_bss_info_change_notify(sdata
, BSS_CHANGED_BEACON
);
530 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data
*sdata
)
532 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
533 struct cfg80211_bss
*cbss
;
538 /* update cfg80211 bss information with the new channel */
539 if (!is_zero_ether_addr(ifibss
->bssid
)) {
540 capability
= WLAN_CAPABILITY_IBSS
;
543 capability
|= WLAN_CAPABILITY_PRIVACY
;
545 cbss
= cfg80211_get_bss(sdata
->local
->hw
.wiphy
,
546 ifibss
->chandef
.chan
,
547 ifibss
->bssid
, ifibss
->ssid
,
548 ifibss
->ssid_len
, WLAN_CAPABILITY_IBSS
|
549 WLAN_CAPABILITY_PRIVACY
,
551 /* XXX: should not really modify cfg80211 data */
553 cbss
->channel
= sdata
->local
->csa_chandef
.chan
;
554 cfg80211_put_bss(sdata
->local
->hw
.wiphy
, cbss
);
558 ifibss
->chandef
= sdata
->local
->csa_chandef
;
560 /* generate the beacon */
561 err
= ieee80211_ibss_csa_beacon(sdata
, NULL
);
569 void ieee80211_ibss_stop(struct ieee80211_sub_if_data
*sdata
)
571 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
573 cancel_work_sync(&ifibss
->csa_connection_drop_work
);
576 static struct sta_info
*ieee80211_ibss_finish_sta(struct sta_info
*sta
)
579 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
582 memcpy(addr
, sta
->sta
.addr
, ETH_ALEN
);
584 ibss_dbg(sdata
, "Adding new IBSS station %pM\n", addr
);
586 sta_info_pre_move_state(sta
, IEEE80211_STA_AUTH
);
587 sta_info_pre_move_state(sta
, IEEE80211_STA_ASSOC
);
588 /* authorize the station only if the network is not RSN protected. If
589 * not wait for the userspace to authorize it */
590 if (!sta
->sdata
->u
.ibss
.control_port
)
591 sta_info_pre_move_state(sta
, IEEE80211_STA_AUTHORIZED
);
593 rate_control_rate_init(sta
);
595 /* If it fails, maybe we raced another insertion? */
596 if (sta_info_insert_rcu(sta
))
597 return sta_info_get(sdata
, addr
);
601 static struct sta_info
*
602 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data
*sdata
, const u8
*bssid
,
603 const u8
*addr
, u32 supp_rates
)
606 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
607 struct ieee80211_local
*local
= sdata
->local
;
608 struct sta_info
*sta
;
609 struct ieee80211_chanctx_conf
*chanctx_conf
;
610 struct ieee80211_supported_band
*sband
;
611 enum nl80211_bss_scan_width scan_width
;
615 * XXX: Consider removing the least recently used entry and
616 * allow new one to be added.
618 if (local
->num_sta
>= IEEE80211_IBSS_MAX_STA_ENTRIES
) {
619 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
625 if (ifibss
->state
== IEEE80211_IBSS_MLME_SEARCH
) {
630 if (!ether_addr_equal(bssid
, sdata
->u
.ibss
.bssid
)) {
636 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
637 if (WARN_ON_ONCE(!chanctx_conf
))
639 band
= chanctx_conf
->def
.chan
->band
;
640 scan_width
= cfg80211_chandef_to_scan_width(&chanctx_conf
->def
);
643 sta
= sta_info_alloc(sdata
, addr
, GFP_KERNEL
);
649 sta
->last_rx
= jiffies
;
651 /* make sure mandatory rates are always added */
652 sband
= local
->hw
.wiphy
->bands
[band
];
653 sta
->sta
.supp_rates
[band
] = supp_rates
|
654 ieee80211_mandatory_rates(sband
, scan_width
);
656 return ieee80211_ibss_finish_sta(sta
);
659 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data
*sdata
)
661 struct ieee80211_local
*local
= sdata
->local
;
663 struct sta_info
*sta
;
665 sdata_assert_lock(sdata
);
669 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
670 if (sta
->sdata
== sdata
&&
671 time_after(sta
->last_rx
+ IEEE80211_IBSS_MERGE_INTERVAL
,
683 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data
*sdata
)
685 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
686 struct ieee80211_local
*local
= sdata
->local
;
687 struct cfg80211_bss
*cbss
;
688 struct beacon_data
*presp
;
689 struct sta_info
*sta
;
693 active_ibss
= ieee80211_sta_active_ibss(sdata
);
695 if (!active_ibss
&& !is_zero_ether_addr(ifibss
->bssid
)) {
696 capability
= WLAN_CAPABILITY_IBSS
;
699 capability
|= WLAN_CAPABILITY_PRIVACY
;
701 cbss
= cfg80211_get_bss(local
->hw
.wiphy
, ifibss
->chandef
.chan
,
702 ifibss
->bssid
, ifibss
->ssid
,
703 ifibss
->ssid_len
, WLAN_CAPABILITY_IBSS
|
704 WLAN_CAPABILITY_PRIVACY
,
708 cfg80211_unlink_bss(local
->hw
.wiphy
, cbss
);
709 cfg80211_put_bss(sdata
->local
->hw
.wiphy
, cbss
);
713 ifibss
->state
= IEEE80211_IBSS_MLME_SEARCH
;
715 sta_info_flush(sdata
);
717 spin_lock_bh(&ifibss
->incomplete_lock
);
718 while (!list_empty(&ifibss
->incomplete_stations
)) {
719 sta
= list_first_entry(&ifibss
->incomplete_stations
,
720 struct sta_info
, list
);
721 list_del(&sta
->list
);
722 spin_unlock_bh(&ifibss
->incomplete_lock
);
724 sta_info_free(local
, sta
);
725 spin_lock_bh(&ifibss
->incomplete_lock
);
727 spin_unlock_bh(&ifibss
->incomplete_lock
);
729 netif_carrier_off(sdata
->dev
);
731 sdata
->vif
.bss_conf
.ibss_joined
= false;
732 sdata
->vif
.bss_conf
.ibss_creator
= false;
733 sdata
->vif
.bss_conf
.enable_beacon
= false;
734 sdata
->vif
.bss_conf
.ssid_len
= 0;
737 presp
= rcu_dereference_protected(ifibss
->presp
,
738 lockdep_is_held(&sdata
->wdev
.mtx
));
739 RCU_INIT_POINTER(sdata
->u
.ibss
.presp
, NULL
);
741 kfree_rcu(presp
, rcu_head
);
743 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED
, &sdata
->state
);
744 ieee80211_bss_info_change_notify(sdata
, BSS_CHANGED_BEACON_ENABLED
|
746 drv_leave_ibss(local
, sdata
);
747 ieee80211_vif_release_channel(sdata
);
750 static void ieee80211_csa_connection_drop_work(struct work_struct
*work
)
752 struct ieee80211_sub_if_data
*sdata
=
753 container_of(work
, struct ieee80211_sub_if_data
,
754 u
.ibss
.csa_connection_drop_work
);
756 ieee80211_ibss_disconnect(sdata
);
758 skb_queue_purge(&sdata
->skb_queue
);
760 /* trigger a scan to find another IBSS network to join */
761 ieee80211_queue_work(&sdata
->local
->hw
, &sdata
->work
);
764 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data
*sdata
)
766 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
769 /* if the current channel is a DFS channel, mark the channel as
772 err
= cfg80211_chandef_dfs_required(sdata
->local
->hw
.wiphy
,
775 cfg80211_radar_event(sdata
->local
->hw
.wiphy
, &ifibss
->chandef
,
780 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data
*sdata
,
781 struct ieee802_11_elems
*elems
,
784 struct cfg80211_csa_settings params
;
785 struct ieee80211_csa_ie csa_ie
;
786 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
787 struct ieee80211_chanctx_conf
*chanctx_conf
;
788 struct ieee80211_chanctx
*chanctx
;
789 enum nl80211_channel_type ch_type
;
790 int err
, num_chanctx
;
793 if (sdata
->vif
.csa_active
)
796 if (!sdata
->vif
.bss_conf
.ibss_joined
)
799 sta_flags
= IEEE80211_STA_DISABLE_VHT
;
800 switch (ifibss
->chandef
.width
) {
801 case NL80211_CHAN_WIDTH_5
:
802 case NL80211_CHAN_WIDTH_10
:
803 case NL80211_CHAN_WIDTH_20_NOHT
:
804 sta_flags
|= IEEE80211_STA_DISABLE_HT
;
806 case NL80211_CHAN_WIDTH_20
:
807 sta_flags
|= IEEE80211_STA_DISABLE_40MHZ
;
813 memset(¶ms
, 0, sizeof(params
));
814 memset(&csa_ie
, 0, sizeof(csa_ie
));
815 err
= ieee80211_parse_ch_switch_ie(sdata
, elems
, beacon
,
816 ifibss
->chandef
.chan
->band
,
817 sta_flags
, ifibss
->bssid
, &csa_ie
);
818 /* can't switch to destination channel, fail */
822 /* did not contain a CSA */
826 params
.count
= csa_ie
.count
;
827 params
.chandef
= csa_ie
.chandef
;
829 if (ifibss
->chandef
.chan
->band
!= params
.chandef
.chan
->band
)
832 switch (ifibss
->chandef
.width
) {
833 case NL80211_CHAN_WIDTH_20_NOHT
:
834 case NL80211_CHAN_WIDTH_20
:
835 case NL80211_CHAN_WIDTH_40
:
836 /* keep our current HT mode (HT20/HT40+/HT40-), even if
837 * another mode has been announced. The mode is not adopted
838 * within the beacon while doing CSA and we should therefore
839 * keep the mode which we announce.
841 ch_type
= cfg80211_get_chandef_type(&ifibss
->chandef
);
842 cfg80211_chandef_create(¶ms
.chandef
, params
.chandef
.chan
,
845 case NL80211_CHAN_WIDTH_5
:
846 case NL80211_CHAN_WIDTH_10
:
847 if (params
.chandef
.width
!= ifibss
->chandef
.width
) {
849 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
851 params
.chandef
.chan
->center_freq
,
852 params
.chandef
.width
,
853 params
.chandef
.center_freq1
,
854 params
.chandef
.center_freq2
);
859 /* should not happen, sta_flags should prevent VHT modes. */
864 if (!cfg80211_reg_can_beacon(sdata
->local
->hw
.wiphy
, ¶ms
.chandef
)) {
866 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
868 params
.chandef
.chan
->center_freq
,
869 params
.chandef
.width
,
870 params
.chandef
.center_freq1
,
871 params
.chandef
.center_freq2
);
875 err
= cfg80211_chandef_dfs_required(sdata
->local
->hw
.wiphy
,
880 /* IBSS-DFS only allowed with a control program */
881 if (!ifibss
->userspace_handles_dfs
)
884 params
.radar_required
= true;
888 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
894 /* don't handle for multi-VIF cases */
895 chanctx
= container_of(chanctx_conf
, struct ieee80211_chanctx
, conf
);
896 if (chanctx
->refcount
> 1) {
901 list_for_each_entry_rcu(chanctx
, &sdata
->local
->chanctx_list
, list
)
904 if (num_chanctx
> 1) {
910 /* all checks done, now perform the channel switch. */
912 "received channel switch announcement to go to channel %d MHz\n",
913 params
.chandef
.chan
->center_freq
);
915 params
.block_tx
= !!csa_ie
.mode
;
917 ieee80211_ibss_csa_beacon(sdata
, ¶ms
);
918 sdata
->csa_radar_required
= params
.radar_required
;
921 ieee80211_stop_queues_by_reason(&sdata
->local
->hw
,
922 IEEE80211_MAX_QUEUE_MAP
,
923 IEEE80211_QUEUE_STOP_REASON_CSA
);
925 sdata
->local
->csa_chandef
= params
.chandef
;
926 sdata
->vif
.csa_active
= true;
928 ieee80211_bss_info_change_notify(sdata
, err
);
929 drv_channel_switch_beacon(sdata
, ¶ms
.chandef
);
931 ieee80211_ibss_csa_mark_radar(sdata
);
935 ibss_dbg(sdata
, "Can't handle channel switch, disconnect\n");
936 ieee80211_queue_work(&sdata
->local
->hw
,
937 &ifibss
->csa_connection_drop_work
);
939 ieee80211_ibss_csa_mark_radar(sdata
);
945 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data
*sdata
,
946 struct ieee80211_mgmt
*mgmt
, size_t len
,
947 struct ieee80211_rx_status
*rx_status
,
948 struct ieee802_11_elems
*elems
)
952 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
955 /* CSA is the only action we handle for now */
956 if (mgmt
->u
.action
.u
.measurement
.action_code
!=
957 WLAN_ACTION_SPCT_CHL_SWITCH
)
960 required_len
= IEEE80211_MIN_ACTION_SIZE
+
961 sizeof(mgmt
->u
.action
.u
.chan_switch
);
962 if (len
< required_len
)
965 ieee80211_ibss_process_chanswitch(sdata
, elems
, false);
968 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data
*sdata
,
969 struct ieee80211_mgmt
*mgmt
,
972 u16 reason
= le16_to_cpu(mgmt
->u
.deauth
.reason_code
);
974 if (len
< IEEE80211_DEAUTH_FRAME_LEN
)
977 ibss_dbg(sdata
, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
978 mgmt
->sa
, mgmt
->da
, mgmt
->bssid
, reason
);
979 sta_info_destroy_addr(sdata
, mgmt
->sa
);
982 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data
*sdata
,
983 struct ieee80211_mgmt
*mgmt
,
986 u16 auth_alg
, auth_transaction
;
988 sdata_assert_lock(sdata
);
993 auth_alg
= le16_to_cpu(mgmt
->u
.auth
.auth_alg
);
994 auth_transaction
= le16_to_cpu(mgmt
->u
.auth
.auth_transaction
);
997 "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
998 mgmt
->sa
, mgmt
->da
, mgmt
->bssid
, auth_transaction
);
1000 if (auth_alg
!= WLAN_AUTH_OPEN
|| auth_transaction
!= 1)
1004 * IEEE 802.11 standard does not require authentication in IBSS
1005 * networks and most implementations do not seem to use it.
1006 * However, try to reply to authentication attempts if someone
1007 * has actually implemented this.
1009 ieee80211_send_auth(sdata
, 2, WLAN_AUTH_OPEN
, 0, NULL
, 0,
1010 mgmt
->sa
, sdata
->u
.ibss
.bssid
, NULL
, 0, 0, 0);
1013 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data
*sdata
,
1014 struct ieee80211_mgmt
*mgmt
, size_t len
,
1015 struct ieee80211_rx_status
*rx_status
,
1016 struct ieee802_11_elems
*elems
)
1018 struct ieee80211_local
*local
= sdata
->local
;
1020 struct cfg80211_bss
*cbss
;
1021 struct ieee80211_bss
*bss
;
1022 struct sta_info
*sta
;
1023 struct ieee80211_channel
*channel
;
1024 u64 beacon_timestamp
, rx_timestamp
;
1026 enum ieee80211_band band
= rx_status
->band
;
1027 enum nl80211_bss_scan_width scan_width
;
1028 struct ieee80211_supported_band
*sband
= local
->hw
.wiphy
->bands
[band
];
1029 bool rates_updated
= false;
1031 if (elems
->ds_params
)
1032 freq
= ieee80211_channel_to_frequency(elems
->ds_params
[0],
1035 freq
= rx_status
->freq
;
1037 channel
= ieee80211_get_channel(local
->hw
.wiphy
, freq
);
1039 if (!channel
|| channel
->flags
& IEEE80211_CHAN_DISABLED
)
1042 if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
&&
1043 ether_addr_equal(mgmt
->bssid
, sdata
->u
.ibss
.bssid
)) {
1046 sta
= sta_info_get(sdata
, mgmt
->sa
);
1048 if (elems
->supp_rates
) {
1049 supp_rates
= ieee80211_sta_get_rates(sdata
, elems
,
1054 prev_rates
= sta
->sta
.supp_rates
[band
];
1055 /* make sure mandatory rates are always added */
1056 scan_width
= NL80211_BSS_CHAN_WIDTH_20
;
1057 if (rx_status
->flag
& RX_FLAG_5MHZ
)
1058 scan_width
= NL80211_BSS_CHAN_WIDTH_5
;
1059 if (rx_status
->flag
& RX_FLAG_10MHZ
)
1060 scan_width
= NL80211_BSS_CHAN_WIDTH_10
;
1062 sta
->sta
.supp_rates
[band
] = supp_rates
|
1063 ieee80211_mandatory_rates(sband
,
1065 if (sta
->sta
.supp_rates
[band
] != prev_rates
) {
1067 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1068 sta
->sta
.addr
, prev_rates
,
1069 sta
->sta
.supp_rates
[band
]);
1070 rates_updated
= true;
1074 sta
= ieee80211_ibss_add_sta(sdata
, mgmt
->bssid
,
1075 mgmt
->sa
, supp_rates
);
1079 if (sta
&& elems
->wmm_info
)
1080 set_sta_flag(sta
, WLAN_STA_WME
);
1082 if (sta
&& elems
->ht_operation
&& elems
->ht_cap_elem
&&
1083 sdata
->u
.ibss
.chandef
.width
!= NL80211_CHAN_WIDTH_20_NOHT
&&
1084 sdata
->u
.ibss
.chandef
.width
!= NL80211_CHAN_WIDTH_5
&&
1085 sdata
->u
.ibss
.chandef
.width
!= NL80211_CHAN_WIDTH_10
) {
1086 /* we both use HT */
1087 struct ieee80211_ht_cap htcap_ie
;
1088 struct cfg80211_chan_def chandef
;
1090 ieee80211_ht_oper_to_chandef(channel
,
1091 elems
->ht_operation
,
1094 memcpy(&htcap_ie
, elems
->ht_cap_elem
, sizeof(htcap_ie
));
1097 * fall back to HT20 if we don't use or use
1098 * the other extension channel
1100 if (chandef
.center_freq1
!=
1101 sdata
->u
.ibss
.chandef
.center_freq1
)
1102 htcap_ie
.cap_info
&=
1103 cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40
);
1105 rates_updated
|= ieee80211_ht_cap_ie_to_sta_ht_cap(
1106 sdata
, sband
, &htcap_ie
, sta
);
1109 if (sta
&& rates_updated
) {
1110 drv_sta_rc_update(local
, sdata
, &sta
->sta
,
1111 IEEE80211_RC_SUPP_RATES_CHANGED
);
1112 rate_control_rate_init(sta
);
1118 bss
= ieee80211_bss_info_update(local
, rx_status
, mgmt
, len
, elems
,
1123 cbss
= container_of((void *)bss
, struct cfg80211_bss
, priv
);
1125 /* same for beacon and probe response */
1126 beacon_timestamp
= le64_to_cpu(mgmt
->u
.beacon
.timestamp
);
1128 /* check if we need to merge IBSS */
1131 if (!(cbss
->capability
& WLAN_CAPABILITY_IBSS
))
1134 /* different channel */
1135 if (sdata
->u
.ibss
.fixed_channel
&&
1136 sdata
->u
.ibss
.chandef
.chan
!= cbss
->channel
)
1139 /* different SSID */
1140 if (elems
->ssid_len
!= sdata
->u
.ibss
.ssid_len
||
1141 memcmp(elems
->ssid
, sdata
->u
.ibss
.ssid
,
1142 sdata
->u
.ibss
.ssid_len
))
1145 /* process channel switch */
1146 if (ieee80211_ibss_process_chanswitch(sdata
, elems
, true))
1150 if (ether_addr_equal(cbss
->bssid
, sdata
->u
.ibss
.bssid
))
1153 /* we use a fixed BSSID */
1154 if (sdata
->u
.ibss
.fixed_bssid
)
1157 if (ieee80211_have_rx_timestamp(rx_status
)) {
1158 /* time when timestamp field was received */
1160 ieee80211_calculate_rx_timestamp(local
, rx_status
,
1164 * second best option: get current TSF
1165 * (will return -1 if not supported)
1167 rx_timestamp
= drv_get_tsf(local
, sdata
);
1171 "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1172 mgmt
->sa
, mgmt
->bssid
,
1173 (unsigned long long)rx_timestamp
,
1174 (unsigned long long)beacon_timestamp
,
1175 (unsigned long long)(rx_timestamp
- beacon_timestamp
),
1178 if (beacon_timestamp
> rx_timestamp
) {
1180 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1182 ieee80211_sta_join_ibss(sdata
, bss
);
1183 supp_rates
= ieee80211_sta_get_rates(sdata
, elems
, band
, NULL
);
1184 ieee80211_ibss_add_sta(sdata
, mgmt
->bssid
, mgmt
->sa
,
1190 ieee80211_rx_bss_put(local
, bss
);
1193 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data
*sdata
,
1194 const u8
*bssid
, const u8
*addr
,
1197 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
1198 struct ieee80211_local
*local
= sdata
->local
;
1199 struct sta_info
*sta
;
1200 struct ieee80211_chanctx_conf
*chanctx_conf
;
1201 struct ieee80211_supported_band
*sband
;
1202 enum nl80211_bss_scan_width scan_width
;
1206 * XXX: Consider removing the least recently used entry and
1207 * allow new one to be added.
1209 if (local
->num_sta
>= IEEE80211_IBSS_MAX_STA_ENTRIES
) {
1210 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1215 if (ifibss
->state
== IEEE80211_IBSS_MLME_SEARCH
)
1218 if (!ether_addr_equal(bssid
, sdata
->u
.ibss
.bssid
))
1222 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
1223 if (WARN_ON_ONCE(!chanctx_conf
)) {
1227 band
= chanctx_conf
->def
.chan
->band
;
1228 scan_width
= cfg80211_chandef_to_scan_width(&chanctx_conf
->def
);
1231 sta
= sta_info_alloc(sdata
, addr
, GFP_ATOMIC
);
1235 sta
->last_rx
= jiffies
;
1237 /* make sure mandatory rates are always added */
1238 sband
= local
->hw
.wiphy
->bands
[band
];
1239 sta
->sta
.supp_rates
[band
] = supp_rates
|
1240 ieee80211_mandatory_rates(sband
, scan_width
);
1242 spin_lock(&ifibss
->incomplete_lock
);
1243 list_add(&sta
->list
, &ifibss
->incomplete_stations
);
1244 spin_unlock(&ifibss
->incomplete_lock
);
1245 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
1248 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data
*sdata
)
1250 struct ieee80211_local
*local
= sdata
->local
;
1251 struct sta_info
*sta
, *tmp
;
1252 unsigned long exp_time
= IEEE80211_IBSS_INACTIVITY_LIMIT
;
1253 unsigned long exp_rsn_time
= IEEE80211_IBSS_RSN_INACTIVITY_LIMIT
;
1255 mutex_lock(&local
->sta_mtx
);
1257 list_for_each_entry_safe(sta
, tmp
, &local
->sta_list
, list
) {
1258 if (sdata
!= sta
->sdata
)
1261 if (time_after(jiffies
, sta
->last_rx
+ exp_time
) ||
1262 (time_after(jiffies
, sta
->last_rx
+ exp_rsn_time
) &&
1263 sta
->sta_state
!= IEEE80211_STA_AUTHORIZED
)) {
1264 sta_dbg(sta
->sdata
, "expiring inactive %sSTA %pM\n",
1265 sta
->sta_state
!= IEEE80211_STA_AUTHORIZED
?
1266 "not authorized " : "", sta
->sta
.addr
);
1268 WARN_ON(__sta_info_destroy(sta
));
1272 mutex_unlock(&local
->sta_mtx
);
1276 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1279 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data
*sdata
)
1281 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
1282 enum nl80211_bss_scan_width scan_width
;
1284 sdata_assert_lock(sdata
);
1286 mod_timer(&ifibss
->timer
,
1287 round_jiffies(jiffies
+ IEEE80211_IBSS_MERGE_INTERVAL
));
1289 ieee80211_ibss_sta_expire(sdata
);
1291 if (time_before(jiffies
, ifibss
->last_scan_completed
+
1292 IEEE80211_IBSS_MERGE_INTERVAL
))
1295 if (ieee80211_sta_active_ibss(sdata
))
1298 if (ifibss
->fixed_channel
)
1302 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1304 scan_width
= cfg80211_chandef_to_scan_width(&ifibss
->chandef
);
1305 ieee80211_request_ibss_scan(sdata
, ifibss
->ssid
, ifibss
->ssid_len
,
1309 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data
*sdata
)
1311 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
1316 sdata_assert_lock(sdata
);
1318 if (ifibss
->fixed_bssid
) {
1319 memcpy(bssid
, ifibss
->bssid
, ETH_ALEN
);
1321 /* Generate random, not broadcast, locally administered BSSID. Mix in
1322 * own MAC address to make sure that devices that do not have proper
1323 * random number generator get different BSSID. */
1324 get_random_bytes(bssid
, ETH_ALEN
);
1325 for (i
= 0; i
< ETH_ALEN
; i
++)
1326 bssid
[i
] ^= sdata
->vif
.addr
[i
];
1331 sdata_info(sdata
, "Creating new IBSS network, BSSID %pM\n", bssid
);
1333 capability
= WLAN_CAPABILITY_IBSS
;
1335 if (ifibss
->privacy
)
1336 capability
|= WLAN_CAPABILITY_PRIVACY
;
1338 sdata
->drop_unencrypted
= 0;
1340 __ieee80211_sta_join_ibss(sdata
, bssid
, sdata
->vif
.bss_conf
.beacon_int
,
1341 &ifibss
->chandef
, ifibss
->basic_rates
,
1342 capability
, 0, true);
1346 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1349 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data
*sdata
)
1351 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
1352 struct ieee80211_local
*local
= sdata
->local
;
1353 struct cfg80211_bss
*cbss
;
1354 struct ieee80211_channel
*chan
= NULL
;
1355 const u8
*bssid
= NULL
;
1356 enum nl80211_bss_scan_width scan_width
;
1360 sdata_assert_lock(sdata
);
1362 active_ibss
= ieee80211_sta_active_ibss(sdata
);
1363 ibss_dbg(sdata
, "sta_find_ibss (active_ibss=%d)\n", active_ibss
);
1368 capability
= WLAN_CAPABILITY_IBSS
;
1369 if (ifibss
->privacy
)
1370 capability
|= WLAN_CAPABILITY_PRIVACY
;
1371 if (ifibss
->fixed_bssid
)
1372 bssid
= ifibss
->bssid
;
1373 if (ifibss
->fixed_channel
)
1374 chan
= ifibss
->chandef
.chan
;
1375 if (!is_zero_ether_addr(ifibss
->bssid
))
1376 bssid
= ifibss
->bssid
;
1377 cbss
= cfg80211_get_bss(local
->hw
.wiphy
, chan
, bssid
,
1378 ifibss
->ssid
, ifibss
->ssid_len
,
1379 WLAN_CAPABILITY_IBSS
| WLAN_CAPABILITY_PRIVACY
,
1383 struct ieee80211_bss
*bss
;
1385 bss
= (void *)cbss
->priv
;
1387 "sta_find_ibss: selected %pM current %pM\n",
1388 cbss
->bssid
, ifibss
->bssid
);
1390 "Selected IBSS BSSID %pM based on configured SSID\n",
1393 ieee80211_sta_join_ibss(sdata
, bss
);
1394 ieee80211_rx_bss_put(local
, bss
);
1398 /* if a fixed bssid and a fixed freq have been provided create the IBSS
1399 * directly and do not waste time scanning
1401 if (ifibss
->fixed_bssid
&& ifibss
->fixed_channel
) {
1402 sdata_info(sdata
, "Created IBSS using preconfigured BSSID %pM\n",
1404 ieee80211_sta_create_ibss(sdata
);
1409 ibss_dbg(sdata
, "sta_find_ibss: did not try to join ibss\n");
1411 /* Selected IBSS not found in current scan results - try to scan */
1412 if (time_after(jiffies
, ifibss
->last_scan_completed
+
1413 IEEE80211_SCAN_INTERVAL
)) {
1414 sdata_info(sdata
, "Trigger new scan to find an IBSS to join\n");
1416 scan_width
= cfg80211_chandef_to_scan_width(&ifibss
->chandef
);
1417 ieee80211_request_ibss_scan(sdata
, ifibss
->ssid
,
1418 ifibss
->ssid_len
, chan
,
1421 int interval
= IEEE80211_SCAN_INTERVAL
;
1423 if (time_after(jiffies
, ifibss
->ibss_join_req
+
1424 IEEE80211_IBSS_JOIN_TIMEOUT
))
1425 ieee80211_sta_create_ibss(sdata
);
1427 mod_timer(&ifibss
->timer
,
1428 round_jiffies(jiffies
+ interval
));
1432 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data
*sdata
,
1433 struct sk_buff
*req
)
1435 struct ieee80211_mgmt
*mgmt
= (void *)req
->data
;
1436 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
1437 struct ieee80211_local
*local
= sdata
->local
;
1438 int tx_last_beacon
, len
= req
->len
;
1439 struct sk_buff
*skb
;
1440 struct beacon_data
*presp
;
1443 sdata_assert_lock(sdata
);
1445 presp
= rcu_dereference_protected(ifibss
->presp
,
1446 lockdep_is_held(&sdata
->wdev
.mtx
));
1448 if (ifibss
->state
!= IEEE80211_IBSS_MLME_JOINED
||
1449 len
< 24 + 2 || !presp
)
1452 tx_last_beacon
= drv_tx_last_beacon(local
);
1455 "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
1456 mgmt
->sa
, mgmt
->da
, mgmt
->bssid
, tx_last_beacon
);
1458 if (!tx_last_beacon
&& is_multicast_ether_addr(mgmt
->da
))
1461 if (!ether_addr_equal(mgmt
->bssid
, ifibss
->bssid
) &&
1462 !is_broadcast_ether_addr(mgmt
->bssid
))
1465 end
= ((u8
*) mgmt
) + len
;
1466 pos
= mgmt
->u
.probe_req
.variable
;
1467 if (pos
[0] != WLAN_EID_SSID
||
1468 pos
+ 2 + pos
[1] > end
) {
1469 ibss_dbg(sdata
, "Invalid SSID IE in ProbeReq from %pM\n",
1474 (pos
[1] != ifibss
->ssid_len
||
1475 memcmp(pos
+ 2, ifibss
->ssid
, ifibss
->ssid_len
))) {
1476 /* Ignore ProbeReq for foreign SSID */
1480 /* Reply with ProbeResp */
1481 skb
= dev_alloc_skb(local
->tx_headroom
+ presp
->head_len
);
1485 skb_reserve(skb
, local
->tx_headroom
);
1486 memcpy(skb_put(skb
, presp
->head_len
), presp
->head
, presp
->head_len
);
1488 memcpy(((struct ieee80211_mgmt
*) skb
->data
)->da
, mgmt
->sa
, ETH_ALEN
);
1489 ibss_dbg(sdata
, "Sending ProbeResp to %pM\n", mgmt
->sa
);
1490 IEEE80211_SKB_CB(skb
)->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
1491 ieee80211_tx_skb(sdata
, skb
);
1495 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data
*sdata
,
1496 struct ieee80211_mgmt
*mgmt
, size_t len
,
1497 struct ieee80211_rx_status
*rx_status
)
1500 struct ieee802_11_elems elems
;
1502 BUILD_BUG_ON(offsetof(typeof(mgmt
->u
.probe_resp
), variable
) !=
1503 offsetof(typeof(mgmt
->u
.beacon
), variable
));
1506 * either beacon or probe_resp but the variable field is at the
1509 baselen
= (u8
*) mgmt
->u
.probe_resp
.variable
- (u8
*) mgmt
;
1513 ieee802_11_parse_elems(mgmt
->u
.probe_resp
.variable
, len
- baselen
,
1516 ieee80211_rx_bss_info(sdata
, mgmt
, len
, rx_status
, &elems
);
1519 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data
*sdata
,
1520 struct sk_buff
*skb
)
1522 struct ieee80211_rx_status
*rx_status
;
1523 struct ieee80211_mgmt
*mgmt
;
1525 struct ieee802_11_elems elems
;
1528 rx_status
= IEEE80211_SKB_RXCB(skb
);
1529 mgmt
= (struct ieee80211_mgmt
*) skb
->data
;
1530 fc
= le16_to_cpu(mgmt
->frame_control
);
1534 if (!sdata
->u
.ibss
.ssid_len
)
1535 goto mgmt_out
; /* not ready to merge yet */
1537 switch (fc
& IEEE80211_FCTL_STYPE
) {
1538 case IEEE80211_STYPE_PROBE_REQ
:
1539 ieee80211_rx_mgmt_probe_req(sdata
, skb
);
1541 case IEEE80211_STYPE_PROBE_RESP
:
1542 case IEEE80211_STYPE_BEACON
:
1543 ieee80211_rx_mgmt_probe_beacon(sdata
, mgmt
, skb
->len
,
1546 case IEEE80211_STYPE_AUTH
:
1547 ieee80211_rx_mgmt_auth_ibss(sdata
, mgmt
, skb
->len
);
1549 case IEEE80211_STYPE_DEAUTH
:
1550 ieee80211_rx_mgmt_deauth_ibss(sdata
, mgmt
, skb
->len
);
1552 case IEEE80211_STYPE_ACTION
:
1553 switch (mgmt
->u
.action
.category
) {
1554 case WLAN_CATEGORY_SPECTRUM_MGMT
:
1555 ies_len
= skb
->len
-
1556 offsetof(struct ieee80211_mgmt
,
1557 u
.action
.u
.chan_switch
.variable
);
1562 ieee802_11_parse_elems(
1563 mgmt
->u
.action
.u
.chan_switch
.variable
,
1564 ies_len
, true, &elems
);
1566 if (elems
.parse_error
)
1569 ieee80211_rx_mgmt_spectrum_mgmt(sdata
, mgmt
, skb
->len
,
1576 sdata_unlock(sdata
);
1579 void ieee80211_ibss_work(struct ieee80211_sub_if_data
*sdata
)
1581 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
1582 struct sta_info
*sta
;
1587 * Work could be scheduled after scan or similar
1588 * when we aren't even joined (or trying) with a
1591 if (!ifibss
->ssid_len
)
1594 spin_lock_bh(&ifibss
->incomplete_lock
);
1595 while (!list_empty(&ifibss
->incomplete_stations
)) {
1596 sta
= list_first_entry(&ifibss
->incomplete_stations
,
1597 struct sta_info
, list
);
1598 list_del(&sta
->list
);
1599 spin_unlock_bh(&ifibss
->incomplete_lock
);
1601 ieee80211_ibss_finish_sta(sta
);
1603 spin_lock_bh(&ifibss
->incomplete_lock
);
1605 spin_unlock_bh(&ifibss
->incomplete_lock
);
1607 switch (ifibss
->state
) {
1608 case IEEE80211_IBSS_MLME_SEARCH
:
1609 ieee80211_sta_find_ibss(sdata
);
1611 case IEEE80211_IBSS_MLME_JOINED
:
1612 ieee80211_sta_merge_ibss(sdata
);
1620 sdata_unlock(sdata
);
1623 static void ieee80211_ibss_timer(unsigned long data
)
1625 struct ieee80211_sub_if_data
*sdata
=
1626 (struct ieee80211_sub_if_data
*) data
;
1628 ieee80211_queue_work(&sdata
->local
->hw
, &sdata
->work
);
1631 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data
*sdata
)
1633 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
1635 setup_timer(&ifibss
->timer
, ieee80211_ibss_timer
,
1636 (unsigned long) sdata
);
1637 INIT_LIST_HEAD(&ifibss
->incomplete_stations
);
1638 spin_lock_init(&ifibss
->incomplete_lock
);
1639 INIT_WORK(&ifibss
->csa_connection_drop_work
,
1640 ieee80211_csa_connection_drop_work
);
1643 /* scan finished notification */
1644 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local
*local
)
1646 struct ieee80211_sub_if_data
*sdata
;
1648 mutex_lock(&local
->iflist_mtx
);
1649 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
1650 if (!ieee80211_sdata_running(sdata
))
1652 if (sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
1654 sdata
->u
.ibss
.last_scan_completed
= jiffies
;
1655 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
1657 mutex_unlock(&local
->iflist_mtx
);
1660 int ieee80211_ibss_join(struct ieee80211_sub_if_data
*sdata
,
1661 struct cfg80211_ibss_params
*params
)
1665 struct ieee80211_supported_band
*sband
;
1668 if (params
->bssid
) {
1669 memcpy(sdata
->u
.ibss
.bssid
, params
->bssid
, ETH_ALEN
);
1670 sdata
->u
.ibss
.fixed_bssid
= true;
1672 sdata
->u
.ibss
.fixed_bssid
= false;
1674 sdata
->u
.ibss
.privacy
= params
->privacy
;
1675 sdata
->u
.ibss
.control_port
= params
->control_port
;
1676 sdata
->u
.ibss
.userspace_handles_dfs
= params
->userspace_handles_dfs
;
1677 sdata
->u
.ibss
.basic_rates
= params
->basic_rates
;
1679 /* fix basic_rates if channel does not support these rates */
1680 rate_flags
= ieee80211_chandef_rate_flags(¶ms
->chandef
);
1681 sband
= sdata
->local
->hw
.wiphy
->bands
[params
->chandef
.chan
->band
];
1682 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
1683 if ((rate_flags
& sband
->bitrates
[i
].flags
) != rate_flags
)
1684 sdata
->u
.ibss
.basic_rates
&= ~BIT(i
);
1686 memcpy(sdata
->vif
.bss_conf
.mcast_rate
, params
->mcast_rate
,
1687 sizeof(params
->mcast_rate
));
1689 sdata
->vif
.bss_conf
.beacon_int
= params
->beacon_interval
;
1691 sdata
->u
.ibss
.chandef
= params
->chandef
;
1692 sdata
->u
.ibss
.fixed_channel
= params
->channel_fixed
;
1695 sdata
->u
.ibss
.ie
= kmemdup(params
->ie
, params
->ie_len
,
1697 if (sdata
->u
.ibss
.ie
)
1698 sdata
->u
.ibss
.ie_len
= params
->ie_len
;
1701 sdata
->u
.ibss
.state
= IEEE80211_IBSS_MLME_SEARCH
;
1702 sdata
->u
.ibss
.ibss_join_req
= jiffies
;
1704 memcpy(sdata
->u
.ibss
.ssid
, params
->ssid
, params
->ssid_len
);
1705 sdata
->u
.ibss
.ssid_len
= params
->ssid_len
;
1707 memcpy(&sdata
->u
.ibss
.ht_capa
, ¶ms
->ht_capa
,
1708 sizeof(sdata
->u
.ibss
.ht_capa
));
1709 memcpy(&sdata
->u
.ibss
.ht_capa_mask
, ¶ms
->ht_capa_mask
,
1710 sizeof(sdata
->u
.ibss
.ht_capa_mask
));
1713 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1714 * reserved, but an HT STA shall protect HT transmissions as though
1715 * the HT Protection field were set to non-HT mixed mode.
1717 * In an IBSS, the RIFS Mode field of the HT Operation element is
1718 * also reserved, but an HT STA shall operate as though this field
1722 sdata
->vif
.bss_conf
.ht_operation_mode
|=
1723 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1724 | IEEE80211_HT_PARAM_RIFS_MODE
;
1726 changed
|= BSS_CHANGED_HT
;
1727 ieee80211_bss_info_change_notify(sdata
, changed
);
1729 sdata
->smps_mode
= IEEE80211_SMPS_OFF
;
1730 sdata
->needed_rx_chains
= sdata
->local
->rx_chains
;
1732 ieee80211_queue_work(&sdata
->local
->hw
, &sdata
->work
);
1737 int ieee80211_ibss_leave(struct ieee80211_sub_if_data
*sdata
)
1739 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
1741 ieee80211_ibss_disconnect(sdata
);
1742 ifibss
->ssid_len
= 0;
1743 memset(ifibss
->bssid
, 0, ETH_ALEN
);
1746 kfree(sdata
->u
.ibss
.ie
);
1748 /* on the next join, re-program HT parameters */
1749 memset(&ifibss
->ht_capa
, 0, sizeof(ifibss
->ht_capa
));
1750 memset(&ifibss
->ht_capa_mask
, 0, sizeof(ifibss
->ht_capa_mask
));
1754 skb_queue_purge(&sdata
->skb_queue
);
1756 del_timer_sync(&sdata
->u
.ibss
.timer
);