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)
34 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
37 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data
*sdata
,
38 const u8
*bssid
, const int beacon_int
,
39 struct ieee80211_channel
*chan
,
40 const u32 basic_rates
,
41 const u16 capability
, u64 tsf
,
44 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
45 struct ieee80211_local
*local
= sdata
->local
;
48 struct ieee80211_mgmt
*mgmt
;
50 struct ieee80211_supported_band
*sband
;
51 struct cfg80211_bss
*bss
;
53 u8 supp_rates
[IEEE80211_MAX_SUPP_RATES
];
54 struct cfg80211_chan_def chandef
;
56 lockdep_assert_held(&ifibss
->mtx
);
58 /* Reset own TSF to allow time synchronization work. */
59 drv_reset_tsf(local
, sdata
);
62 RCU_INIT_POINTER(ifibss
->presp
, NULL
);
64 skb
->data
= skb
->head
;
66 skb_reset_tail_pointer(skb
);
67 skb_reserve(skb
, sdata
->local
->hw
.extra_tx_headroom
);
69 if (!ether_addr_equal(ifibss
->bssid
, bssid
))
70 sta_info_flush(sdata
);
72 /* if merging, indicate to driver that we leave the old IBSS */
73 if (sdata
->vif
.bss_conf
.ibss_joined
) {
74 sdata
->vif
.bss_conf
.ibss_joined
= false;
75 sdata
->vif
.bss_conf
.ibss_creator
= false;
76 netif_carrier_off(sdata
->dev
);
77 ieee80211_bss_info_change_notify(sdata
, BSS_CHANGED_IBSS
);
80 sdata
->drop_unencrypted
= capability
& WLAN_CAPABILITY_PRIVACY
? 1 : 0;
82 cfg80211_chandef_create(&chandef
, chan
, ifibss
->channel_type
);
83 if (!cfg80211_reg_can_beacon(local
->hw
.wiphy
, &chandef
)) {
84 chandef
.width
= NL80211_CHAN_WIDTH_20
;
85 chandef
.center_freq1
= chan
->center_freq
;
88 ieee80211_vif_release_channel(sdata
);
89 if (ieee80211_vif_use_channel(sdata
, &chandef
,
90 ifibss
->fixed_channel
?
91 IEEE80211_CHANCTX_SHARED
:
92 IEEE80211_CHANCTX_EXCLUSIVE
)) {
93 sdata_info(sdata
, "Failed to join IBSS, no channel context\n");
97 memcpy(ifibss
->bssid
, bssid
, ETH_ALEN
);
99 sband
= local
->hw
.wiphy
->bands
[chan
->band
];
101 /* build supported rates array */
103 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
104 int rate
= sband
->bitrates
[i
].bitrate
;
106 if (basic_rates
& BIT(i
))
108 *pos
++ = basic
| (u8
) (rate
/ 5);
111 /* Build IBSS probe response */
112 mgmt
= (void *) skb_put(skb
, 24 + sizeof(mgmt
->u
.beacon
));
113 memset(mgmt
, 0, 24 + sizeof(mgmt
->u
.beacon
));
114 mgmt
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
115 IEEE80211_STYPE_PROBE_RESP
);
116 eth_broadcast_addr(mgmt
->da
);
117 memcpy(mgmt
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
118 memcpy(mgmt
->bssid
, ifibss
->bssid
, ETH_ALEN
);
119 mgmt
->u
.beacon
.beacon_int
= cpu_to_le16(beacon_int
);
120 mgmt
->u
.beacon
.timestamp
= cpu_to_le64(tsf
);
121 mgmt
->u
.beacon
.capab_info
= cpu_to_le16(capability
);
123 pos
= skb_put(skb
, 2 + ifibss
->ssid_len
);
124 *pos
++ = WLAN_EID_SSID
;
125 *pos
++ = ifibss
->ssid_len
;
126 memcpy(pos
, ifibss
->ssid
, ifibss
->ssid_len
);
128 rates
= sband
->n_bitrates
;
131 pos
= skb_put(skb
, 2 + rates
);
132 *pos
++ = WLAN_EID_SUPP_RATES
;
134 memcpy(pos
, supp_rates
, rates
);
136 if (sband
->band
== IEEE80211_BAND_2GHZ
) {
137 pos
= skb_put(skb
, 2 + 1);
138 *pos
++ = WLAN_EID_DS_PARAMS
;
140 *pos
++ = ieee80211_frequency_to_channel(chan
->center_freq
);
143 pos
= skb_put(skb
, 2 + 2);
144 *pos
++ = WLAN_EID_IBSS_PARAMS
;
146 /* FIX: set ATIM window based on scan results */
150 if (sband
->n_bitrates
> 8) {
151 rates
= sband
->n_bitrates
- 8;
152 pos
= skb_put(skb
, 2 + rates
);
153 *pos
++ = WLAN_EID_EXT_SUPP_RATES
;
155 memcpy(pos
, &supp_rates
[8], rates
);
159 memcpy(skb_put(skb
, ifibss
->ie_len
),
160 ifibss
->ie
, ifibss
->ie_len
);
162 /* add HT capability and information IEs */
163 if (chandef
.width
!= NL80211_CHAN_WIDTH_20_NOHT
&&
164 sband
->ht_cap
.ht_supported
) {
165 pos
= skb_put(skb
, 4 +
166 sizeof(struct ieee80211_ht_cap
) +
167 sizeof(struct ieee80211_ht_operation
));
168 pos
= ieee80211_ie_build_ht_cap(pos
, &sband
->ht_cap
,
171 * Note: According to 802.11n-2009 9.13.3.1, HT Protection
172 * field and RIFS Mode are reserved in IBSS mode, therefore
175 pos
= ieee80211_ie_build_ht_oper(pos
, &sband
->ht_cap
,
179 if (local
->hw
.queues
>= IEEE80211_NUM_ACS
) {
180 pos
= skb_put(skb
, 9);
181 *pos
++ = WLAN_EID_VENDOR_SPECIFIC
;
182 *pos
++ = 7; /* len */
183 *pos
++ = 0x00; /* Microsoft OUI 00:50:F2 */
186 *pos
++ = 2; /* WME */
187 *pos
++ = 0; /* WME info */
188 *pos
++ = 1; /* WME ver */
189 *pos
++ = 0; /* U-APSD no in use */
192 rcu_assign_pointer(ifibss
->presp
, skb
);
194 sdata
->vif
.bss_conf
.enable_beacon
= true;
195 sdata
->vif
.bss_conf
.beacon_int
= beacon_int
;
196 sdata
->vif
.bss_conf
.basic_rates
= basic_rates
;
197 bss_change
= BSS_CHANGED_BEACON_INT
;
198 bss_change
|= ieee80211_reset_erp_info(sdata
);
199 bss_change
|= BSS_CHANGED_BSSID
;
200 bss_change
|= BSS_CHANGED_BEACON
;
201 bss_change
|= BSS_CHANGED_BEACON_ENABLED
;
202 bss_change
|= BSS_CHANGED_BASIC_RATES
;
203 bss_change
|= BSS_CHANGED_HT
;
204 bss_change
|= BSS_CHANGED_IBSS
;
207 * In 5 GHz/802.11a, we can always use short slot time.
208 * (IEEE 802.11-2012 18.3.8.7)
210 * In 2.4GHz, we must always use long slots in IBSS for compatibility
212 * (IEEE 802.11-2012 19.4.5)
214 * HT follows these specifications (IEEE 802.11-2012 20.3.18)
216 sdata
->vif
.bss_conf
.use_short_slot
= chan
->band
== IEEE80211_BAND_5GHZ
;
217 bss_change
|= BSS_CHANGED_ERP_SLOT
;
219 sdata
->vif
.bss_conf
.ibss_joined
= true;
220 sdata
->vif
.bss_conf
.ibss_creator
= creator
;
221 ieee80211_bss_info_change_notify(sdata
, bss_change
);
223 ieee80211_sta_def_wmm_params(sdata
, sband
->n_bitrates
, supp_rates
);
225 ifibss
->state
= IEEE80211_IBSS_MLME_JOINED
;
226 mod_timer(&ifibss
->timer
,
227 round_jiffies(jiffies
+ IEEE80211_IBSS_MERGE_INTERVAL
));
229 bss
= cfg80211_inform_bss_frame(local
->hw
.wiphy
, chan
,
230 mgmt
, skb
->len
, 0, GFP_KERNEL
);
231 cfg80211_put_bss(bss
);
232 netif_carrier_on(sdata
->dev
);
233 cfg80211_ibss_joined(sdata
->dev
, ifibss
->bssid
, GFP_KERNEL
);
236 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data
*sdata
,
237 struct ieee80211_bss
*bss
)
239 struct cfg80211_bss
*cbss
=
240 container_of((void *)bss
, struct cfg80211_bss
, priv
);
241 struct ieee80211_supported_band
*sband
;
244 u16 beacon_int
= cbss
->beacon_interval
;
246 lockdep_assert_held(&sdata
->u
.ibss
.mtx
);
251 sband
= sdata
->local
->hw
.wiphy
->bands
[cbss
->channel
->band
];
255 for (i
= 0; i
< bss
->supp_rates_len
; i
++) {
256 int rate
= (bss
->supp_rates
[i
] & 0x7f) * 5;
257 bool is_basic
= !!(bss
->supp_rates
[i
] & 0x80);
259 for (j
= 0; j
< sband
->n_bitrates
; j
++) {
260 if (sband
->bitrates
[j
].bitrate
== rate
) {
262 basic_rates
|= BIT(j
);
268 __ieee80211_sta_join_ibss(sdata
, cbss
->bssid
,
277 static struct sta_info
*ieee80211_ibss_finish_sta(struct sta_info
*sta
,
281 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
284 memcpy(addr
, sta
->sta
.addr
, ETH_ALEN
);
286 ibss_dbg(sdata
, "Adding new IBSS station %pM\n", addr
);
288 sta_info_pre_move_state(sta
, IEEE80211_STA_AUTH
);
289 sta_info_pre_move_state(sta
, IEEE80211_STA_ASSOC
);
290 /* authorize the station only if the network is not RSN protected. If
291 * not wait for the userspace to authorize it */
292 if (!sta
->sdata
->u
.ibss
.control_port
)
293 sta_info_pre_move_state(sta
, IEEE80211_STA_AUTHORIZED
);
295 rate_control_rate_init(sta
);
297 /* If it fails, maybe we raced another insertion? */
298 if (sta_info_insert_rcu(sta
))
299 return sta_info_get(sdata
, addr
);
300 if (auth
&& !sdata
->u
.ibss
.auth_frame_registrations
) {
302 "TX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=1)\n",
303 sdata
->vif
.addr
, addr
, sdata
->u
.ibss
.bssid
);
304 ieee80211_send_auth(sdata
, 1, WLAN_AUTH_OPEN
, 0, NULL
, 0,
305 addr
, sdata
->u
.ibss
.bssid
, NULL
, 0, 0);
310 static struct sta_info
*
311 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data
*sdata
,
312 const u8
*bssid
, const u8
*addr
,
313 u32 supp_rates
, bool auth
)
316 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
317 struct ieee80211_local
*local
= sdata
->local
;
318 struct sta_info
*sta
;
319 struct ieee80211_chanctx_conf
*chanctx_conf
;
323 * XXX: Consider removing the least recently used entry and
324 * allow new one to be added.
326 if (local
->num_sta
>= IEEE80211_IBSS_MAX_STA_ENTRIES
) {
327 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
333 if (ifibss
->state
== IEEE80211_IBSS_MLME_SEARCH
) {
338 if (!ether_addr_equal(bssid
, sdata
->u
.ibss
.bssid
)) {
344 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
345 if (WARN_ON_ONCE(!chanctx_conf
))
347 band
= chanctx_conf
->def
.chan
->band
;
350 sta
= sta_info_alloc(sdata
, addr
, GFP_KERNEL
);
356 sta
->last_rx
= jiffies
;
358 /* make sure mandatory rates are always added */
359 sta
->sta
.supp_rates
[band
] = supp_rates
|
360 ieee80211_mandatory_rates(local
, band
);
362 return ieee80211_ibss_finish_sta(sta
, auth
);
365 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data
*sdata
,
366 struct ieee80211_mgmt
*mgmt
,
369 u16 reason
= le16_to_cpu(mgmt
->u
.deauth
.reason_code
);
371 if (len
< IEEE80211_DEAUTH_FRAME_LEN
)
374 ibss_dbg(sdata
, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
375 mgmt
->sa
, mgmt
->da
, mgmt
->bssid
, reason
);
376 sta_info_destroy_addr(sdata
, mgmt
->sa
);
379 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data
*sdata
,
380 struct ieee80211_mgmt
*mgmt
,
383 u16 auth_alg
, auth_transaction
;
384 struct sta_info
*sta
;
385 u8 deauth_frame_buf
[IEEE80211_DEAUTH_FRAME_LEN
];
387 lockdep_assert_held(&sdata
->u
.ibss
.mtx
);
392 auth_alg
= le16_to_cpu(mgmt
->u
.auth
.auth_alg
);
393 auth_transaction
= le16_to_cpu(mgmt
->u
.auth
.auth_transaction
);
396 "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
397 mgmt
->sa
, mgmt
->da
, mgmt
->bssid
, auth_transaction
);
399 if (auth_alg
!= WLAN_AUTH_OPEN
|| auth_transaction
!= 1)
402 sta_info_destroy_addr(sdata
, mgmt
->sa
);
403 sta
= ieee80211_ibss_add_sta(sdata
, mgmt
->bssid
, mgmt
->sa
, 0, false);
407 * if we have any problem in allocating the new station, we reply with a
408 * DEAUTH frame to tell the other end that we had a problem
411 ieee80211_send_deauth_disassoc(sdata
, sdata
->u
.ibss
.bssid
,
412 IEEE80211_STYPE_DEAUTH
,
413 WLAN_REASON_UNSPECIFIED
, true,
419 * IEEE 802.11 standard does not require authentication in IBSS
420 * networks and most implementations do not seem to use it.
421 * However, try to reply to authentication attempts if someone
422 * has actually implemented this.
424 ieee80211_send_auth(sdata
, 2, WLAN_AUTH_OPEN
, 0, NULL
, 0,
425 mgmt
->sa
, sdata
->u
.ibss
.bssid
, NULL
, 0, 0);
428 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data
*sdata
,
429 struct ieee80211_mgmt
*mgmt
, size_t len
,
430 struct ieee80211_rx_status
*rx_status
,
431 struct ieee802_11_elems
*elems
)
433 struct ieee80211_local
*local
= sdata
->local
;
435 struct cfg80211_bss
*cbss
;
436 struct ieee80211_bss
*bss
;
437 struct sta_info
*sta
;
438 struct ieee80211_channel
*channel
;
439 u64 beacon_timestamp
, rx_timestamp
;
441 enum ieee80211_band band
= rx_status
->band
;
442 struct ieee80211_supported_band
*sband
= local
->hw
.wiphy
->bands
[band
];
443 bool rates_updated
= false;
445 if (elems
->ds_params
&& elems
->ds_params_len
== 1)
446 freq
= ieee80211_channel_to_frequency(elems
->ds_params
[0],
449 freq
= rx_status
->freq
;
451 channel
= ieee80211_get_channel(local
->hw
.wiphy
, freq
);
453 if (!channel
|| channel
->flags
& IEEE80211_CHAN_DISABLED
)
456 if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
&&
457 ether_addr_equal(mgmt
->bssid
, sdata
->u
.ibss
.bssid
)) {
460 sta
= sta_info_get(sdata
, mgmt
->sa
);
462 if (elems
->supp_rates
) {
463 supp_rates
= ieee80211_sta_get_rates(local
, elems
,
468 prev_rates
= sta
->sta
.supp_rates
[band
];
469 /* make sure mandatory rates are always added */
470 sta
->sta
.supp_rates
[band
] = supp_rates
|
471 ieee80211_mandatory_rates(local
, band
);
473 if (sta
->sta
.supp_rates
[band
] != prev_rates
) {
475 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
476 sta
->sta
.addr
, prev_rates
,
477 sta
->sta
.supp_rates
[band
]);
478 rates_updated
= true;
482 sta
= ieee80211_ibss_add_sta(sdata
, mgmt
->bssid
,
483 mgmt
->sa
, supp_rates
, true);
487 if (sta
&& elems
->wmm_info
)
488 set_sta_flag(sta
, WLAN_STA_WME
);
490 if (sta
&& elems
->ht_operation
&& elems
->ht_cap_elem
&&
491 sdata
->u
.ibss
.channel_type
!= NL80211_CHAN_NO_HT
) {
493 struct ieee80211_sta_ht_cap sta_ht_cap_new
;
494 struct cfg80211_chan_def chandef
;
496 ieee80211_ht_oper_to_chandef(channel
,
500 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata
, sband
,
505 * fall back to HT20 if we don't use or use
506 * the other extension channel
508 if (chandef
.width
!= NL80211_CHAN_WIDTH_40
||
509 cfg80211_get_chandef_type(&chandef
) !=
510 sdata
->u
.ibss
.channel_type
)
511 sta_ht_cap_new
.cap
&=
512 ~IEEE80211_HT_CAP_SUP_WIDTH_20_40
;
514 if (memcmp(&sta
->sta
.ht_cap
, &sta_ht_cap_new
,
515 sizeof(sta_ht_cap_new
))) {
516 memcpy(&sta
->sta
.ht_cap
, &sta_ht_cap_new
,
517 sizeof(sta_ht_cap_new
));
518 rates_updated
= true;
522 if (sta
&& rates_updated
) {
523 drv_sta_rc_update(local
, sdata
, &sta
->sta
,
524 IEEE80211_RC_SUPP_RATES_CHANGED
);
525 rate_control_rate_init(sta
);
531 bss
= ieee80211_bss_info_update(local
, rx_status
, mgmt
, len
, elems
,
536 cbss
= container_of((void *)bss
, struct cfg80211_bss
, priv
);
538 /* was just updated in ieee80211_bss_info_update */
539 beacon_timestamp
= cbss
->tsf
;
541 /* check if we need to merge IBSS */
543 /* we use a fixed BSSID */
544 if (sdata
->u
.ibss
.fixed_bssid
)
548 if (!(cbss
->capability
& WLAN_CAPABILITY_IBSS
))
551 /* different channel */
552 if (sdata
->u
.ibss
.fixed_channel
&&
553 sdata
->u
.ibss
.channel
!= cbss
->channel
)
557 if (elems
->ssid_len
!= sdata
->u
.ibss
.ssid_len
||
558 memcmp(elems
->ssid
, sdata
->u
.ibss
.ssid
,
559 sdata
->u
.ibss
.ssid_len
))
563 if (ether_addr_equal(cbss
->bssid
, sdata
->u
.ibss
.bssid
))
566 if (ieee80211_have_rx_timestamp(rx_status
)) {
567 /* time when timestamp field was received */
569 ieee80211_calculate_rx_timestamp(local
, rx_status
,
573 * second best option: get current TSF
574 * (will return -1 if not supported)
576 rx_timestamp
= drv_get_tsf(local
, sdata
);
580 "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
581 mgmt
->sa
, mgmt
->bssid
,
582 (unsigned long long)rx_timestamp
,
583 (unsigned long long)beacon_timestamp
,
584 (unsigned long long)(rx_timestamp
- beacon_timestamp
),
587 if (beacon_timestamp
> rx_timestamp
) {
589 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
591 ieee80211_sta_join_ibss(sdata
, bss
);
592 supp_rates
= ieee80211_sta_get_rates(local
, elems
, band
, NULL
);
593 ieee80211_ibss_add_sta(sdata
, mgmt
->bssid
, mgmt
->sa
,
599 ieee80211_rx_bss_put(local
, bss
);
602 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data
*sdata
,
603 const u8
*bssid
, const u8
*addr
,
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
;
613 * XXX: Consider removing the least recently used entry and
614 * allow new one to be added.
616 if (local
->num_sta
>= IEEE80211_IBSS_MAX_STA_ENTRIES
) {
617 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
622 if (ifibss
->state
== IEEE80211_IBSS_MLME_SEARCH
)
625 if (!ether_addr_equal(bssid
, sdata
->u
.ibss
.bssid
))
629 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
630 if (WARN_ON_ONCE(!chanctx_conf
)) {
634 band
= chanctx_conf
->def
.chan
->band
;
637 sta
= sta_info_alloc(sdata
, addr
, GFP_ATOMIC
);
641 sta
->last_rx
= jiffies
;
643 /* make sure mandatory rates are always added */
644 sta
->sta
.supp_rates
[band
] = supp_rates
|
645 ieee80211_mandatory_rates(local
, band
);
647 spin_lock(&ifibss
->incomplete_lock
);
648 list_add(&sta
->list
, &ifibss
->incomplete_stations
);
649 spin_unlock(&ifibss
->incomplete_lock
);
650 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
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 lockdep_assert_held(&sdata
->u
.ibss
.mtx
);
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
,
678 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
681 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data
*sdata
)
683 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
685 lockdep_assert_held(&ifibss
->mtx
);
687 mod_timer(&ifibss
->timer
,
688 round_jiffies(jiffies
+ IEEE80211_IBSS_MERGE_INTERVAL
));
690 ieee80211_sta_expire(sdata
, IEEE80211_IBSS_INACTIVITY_LIMIT
);
692 if (time_before(jiffies
, ifibss
->last_scan_completed
+
693 IEEE80211_IBSS_MERGE_INTERVAL
))
696 if (ieee80211_sta_active_ibss(sdata
))
699 if (ifibss
->fixed_channel
)
703 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
705 ieee80211_request_ibss_scan(sdata
, ifibss
->ssid
, ifibss
->ssid_len
,
709 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data
*sdata
)
711 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
716 lockdep_assert_held(&ifibss
->mtx
);
718 if (ifibss
->fixed_bssid
) {
719 memcpy(bssid
, ifibss
->bssid
, ETH_ALEN
);
721 /* Generate random, not broadcast, locally administered BSSID. Mix in
722 * own MAC address to make sure that devices that do not have proper
723 * random number generator get different BSSID. */
724 get_random_bytes(bssid
, ETH_ALEN
);
725 for (i
= 0; i
< ETH_ALEN
; i
++)
726 bssid
[i
] ^= sdata
->vif
.addr
[i
];
731 sdata_info(sdata
, "Creating new IBSS network, BSSID %pM\n", bssid
);
733 capability
= WLAN_CAPABILITY_IBSS
;
736 capability
|= WLAN_CAPABILITY_PRIVACY
;
738 sdata
->drop_unencrypted
= 0;
740 __ieee80211_sta_join_ibss(sdata
, bssid
, sdata
->vif
.bss_conf
.beacon_int
,
741 ifibss
->channel
, ifibss
->basic_rates
,
742 capability
, 0, true);
746 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
749 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data
*sdata
)
751 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
752 struct ieee80211_local
*local
= sdata
->local
;
753 struct cfg80211_bss
*cbss
;
754 struct ieee80211_channel
*chan
= NULL
;
755 const u8
*bssid
= NULL
;
759 lockdep_assert_held(&ifibss
->mtx
);
761 active_ibss
= ieee80211_sta_active_ibss(sdata
);
762 ibss_dbg(sdata
, "sta_find_ibss (active_ibss=%d)\n", active_ibss
);
767 capability
= WLAN_CAPABILITY_IBSS
;
769 capability
|= WLAN_CAPABILITY_PRIVACY
;
770 if (ifibss
->fixed_bssid
)
771 bssid
= ifibss
->bssid
;
772 if (ifibss
->fixed_channel
)
773 chan
= ifibss
->channel
;
774 if (!is_zero_ether_addr(ifibss
->bssid
))
775 bssid
= ifibss
->bssid
;
776 cbss
= cfg80211_get_bss(local
->hw
.wiphy
, chan
, bssid
,
777 ifibss
->ssid
, ifibss
->ssid_len
,
778 WLAN_CAPABILITY_IBSS
| WLAN_CAPABILITY_PRIVACY
,
782 struct ieee80211_bss
*bss
;
784 bss
= (void *)cbss
->priv
;
786 "sta_find_ibss: selected %pM current %pM\n",
787 cbss
->bssid
, ifibss
->bssid
);
789 "Selected IBSS BSSID %pM based on configured SSID\n",
792 ieee80211_sta_join_ibss(sdata
, bss
);
793 ieee80211_rx_bss_put(local
, bss
);
797 ibss_dbg(sdata
, "sta_find_ibss: did not try to join ibss\n");
799 /* Selected IBSS not found in current scan results - try to scan */
800 if (time_after(jiffies
, ifibss
->last_scan_completed
+
801 IEEE80211_SCAN_INTERVAL
)) {
802 sdata_info(sdata
, "Trigger new scan to find an IBSS to join\n");
804 ieee80211_request_ibss_scan(sdata
, ifibss
->ssid
,
805 ifibss
->ssid_len
, chan
);
807 int interval
= IEEE80211_SCAN_INTERVAL
;
809 if (time_after(jiffies
, ifibss
->ibss_join_req
+
810 IEEE80211_IBSS_JOIN_TIMEOUT
))
811 ieee80211_sta_create_ibss(sdata
);
813 mod_timer(&ifibss
->timer
,
814 round_jiffies(jiffies
+ interval
));
818 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data
*sdata
,
821 struct ieee80211_mgmt
*mgmt
= (void *)req
->data
;
822 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
823 struct ieee80211_local
*local
= sdata
->local
;
824 int tx_last_beacon
, len
= req
->len
;
826 struct ieee80211_mgmt
*resp
;
827 struct sk_buff
*presp
;
830 lockdep_assert_held(&ifibss
->mtx
);
832 presp
= rcu_dereference_protected(ifibss
->presp
,
833 lockdep_is_held(&ifibss
->mtx
));
835 if (ifibss
->state
!= IEEE80211_IBSS_MLME_JOINED
||
836 len
< 24 + 2 || !presp
)
839 tx_last_beacon
= drv_tx_last_beacon(local
);
842 "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
843 mgmt
->sa
, mgmt
->da
, mgmt
->bssid
, tx_last_beacon
);
845 if (!tx_last_beacon
&& is_multicast_ether_addr(mgmt
->da
))
848 if (!ether_addr_equal(mgmt
->bssid
, ifibss
->bssid
) &&
849 !is_broadcast_ether_addr(mgmt
->bssid
))
852 end
= ((u8
*) mgmt
) + len
;
853 pos
= mgmt
->u
.probe_req
.variable
;
854 if (pos
[0] != WLAN_EID_SSID
||
855 pos
+ 2 + pos
[1] > end
) {
856 ibss_dbg(sdata
, "Invalid SSID IE in ProbeReq from %pM\n",
861 (pos
[1] != ifibss
->ssid_len
||
862 memcmp(pos
+ 2, ifibss
->ssid
, ifibss
->ssid_len
))) {
863 /* Ignore ProbeReq for foreign SSID */
867 /* Reply with ProbeResp */
868 skb
= skb_copy(presp
, GFP_KERNEL
);
872 resp
= (struct ieee80211_mgmt
*) skb
->data
;
873 memcpy(resp
->da
, mgmt
->sa
, ETH_ALEN
);
874 ibss_dbg(sdata
, "Sending ProbeResp to %pM\n", resp
->da
);
875 IEEE80211_SKB_CB(skb
)->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
876 ieee80211_tx_skb(sdata
, skb
);
880 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data
*sdata
,
881 struct ieee80211_mgmt
*mgmt
, size_t len
,
882 struct ieee80211_rx_status
*rx_status
)
885 struct ieee802_11_elems elems
;
887 BUILD_BUG_ON(offsetof(typeof(mgmt
->u
.probe_resp
), variable
) !=
888 offsetof(typeof(mgmt
->u
.beacon
), variable
));
891 * either beacon or probe_resp but the variable field is at the
894 baselen
= (u8
*) mgmt
->u
.probe_resp
.variable
- (u8
*) mgmt
;
898 ieee802_11_parse_elems(mgmt
->u
.probe_resp
.variable
, len
- baselen
,
901 ieee80211_rx_bss_info(sdata
, mgmt
, len
, rx_status
, &elems
);
904 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data
*sdata
,
907 struct ieee80211_rx_status
*rx_status
;
908 struct ieee80211_mgmt
*mgmt
;
911 rx_status
= IEEE80211_SKB_RXCB(skb
);
912 mgmt
= (struct ieee80211_mgmt
*) skb
->data
;
913 fc
= le16_to_cpu(mgmt
->frame_control
);
915 mutex_lock(&sdata
->u
.ibss
.mtx
);
917 if (!sdata
->u
.ibss
.ssid_len
)
918 goto mgmt_out
; /* not ready to merge yet */
920 switch (fc
& IEEE80211_FCTL_STYPE
) {
921 case IEEE80211_STYPE_PROBE_REQ
:
922 ieee80211_rx_mgmt_probe_req(sdata
, skb
);
924 case IEEE80211_STYPE_PROBE_RESP
:
925 case IEEE80211_STYPE_BEACON
:
926 ieee80211_rx_mgmt_probe_beacon(sdata
, mgmt
, skb
->len
,
929 case IEEE80211_STYPE_AUTH
:
930 ieee80211_rx_mgmt_auth_ibss(sdata
, mgmt
, skb
->len
);
932 case IEEE80211_STYPE_DEAUTH
:
933 ieee80211_rx_mgmt_deauth_ibss(sdata
, mgmt
, skb
->len
);
938 mutex_unlock(&sdata
->u
.ibss
.mtx
);
941 void ieee80211_ibss_work(struct ieee80211_sub_if_data
*sdata
)
943 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
944 struct sta_info
*sta
;
946 mutex_lock(&ifibss
->mtx
);
949 * Work could be scheduled after scan or similar
950 * when we aren't even joined (or trying) with a
953 if (!ifibss
->ssid_len
)
956 spin_lock_bh(&ifibss
->incomplete_lock
);
957 while (!list_empty(&ifibss
->incomplete_stations
)) {
958 sta
= list_first_entry(&ifibss
->incomplete_stations
,
959 struct sta_info
, list
);
960 list_del(&sta
->list
);
961 spin_unlock_bh(&ifibss
->incomplete_lock
);
963 ieee80211_ibss_finish_sta(sta
, true);
965 spin_lock_bh(&ifibss
->incomplete_lock
);
967 spin_unlock_bh(&ifibss
->incomplete_lock
);
969 switch (ifibss
->state
) {
970 case IEEE80211_IBSS_MLME_SEARCH
:
971 ieee80211_sta_find_ibss(sdata
);
973 case IEEE80211_IBSS_MLME_JOINED
:
974 ieee80211_sta_merge_ibss(sdata
);
982 mutex_unlock(&ifibss
->mtx
);
985 static void ieee80211_ibss_timer(unsigned long data
)
987 struct ieee80211_sub_if_data
*sdata
=
988 (struct ieee80211_sub_if_data
*) data
;
989 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
990 struct ieee80211_local
*local
= sdata
->local
;
992 if (local
->quiescing
) {
993 ifibss
->timer_running
= true;
997 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
1001 void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data
*sdata
)
1003 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
1005 if (del_timer_sync(&ifibss
->timer
))
1006 ifibss
->timer_running
= true;
1009 void ieee80211_ibss_restart(struct ieee80211_sub_if_data
*sdata
)
1011 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
1013 if (ifibss
->timer_running
) {
1014 add_timer(&ifibss
->timer
);
1015 ifibss
->timer_running
= false;
1020 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data
*sdata
)
1022 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
1024 setup_timer(&ifibss
->timer
, ieee80211_ibss_timer
,
1025 (unsigned long) sdata
);
1026 mutex_init(&ifibss
->mtx
);
1027 INIT_LIST_HEAD(&ifibss
->incomplete_stations
);
1028 spin_lock_init(&ifibss
->incomplete_lock
);
1031 /* scan finished notification */
1032 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local
*local
)
1034 struct ieee80211_sub_if_data
*sdata
;
1036 mutex_lock(&local
->iflist_mtx
);
1037 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
1038 if (!ieee80211_sdata_running(sdata
))
1040 if (sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
1042 sdata
->u
.ibss
.last_scan_completed
= jiffies
;
1043 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
1045 mutex_unlock(&local
->iflist_mtx
);
1048 int ieee80211_ibss_join(struct ieee80211_sub_if_data
*sdata
,
1049 struct cfg80211_ibss_params
*params
)
1051 struct sk_buff
*skb
;
1054 skb
= dev_alloc_skb(sdata
->local
->hw
.extra_tx_headroom
+
1055 sizeof(struct ieee80211_hdr_3addr
) +
1056 12 /* struct ieee80211_mgmt.u.beacon */ +
1057 2 + IEEE80211_MAX_SSID_LEN
/* max SSID */ +
1058 2 + 8 /* max Supported Rates */ +
1059 3 /* max DS params */ +
1060 4 /* IBSS params */ +
1061 2 + (IEEE80211_MAX_SUPP_RATES
- 8) +
1062 2 + sizeof(struct ieee80211_ht_cap
) +
1063 2 + sizeof(struct ieee80211_ht_operation
) +
1068 mutex_lock(&sdata
->u
.ibss
.mtx
);
1070 if (params
->bssid
) {
1071 memcpy(sdata
->u
.ibss
.bssid
, params
->bssid
, ETH_ALEN
);
1072 sdata
->u
.ibss
.fixed_bssid
= true;
1074 sdata
->u
.ibss
.fixed_bssid
= false;
1076 sdata
->u
.ibss
.privacy
= params
->privacy
;
1077 sdata
->u
.ibss
.control_port
= params
->control_port
;
1078 sdata
->u
.ibss
.basic_rates
= params
->basic_rates
;
1079 memcpy(sdata
->vif
.bss_conf
.mcast_rate
, params
->mcast_rate
,
1080 sizeof(params
->mcast_rate
));
1082 sdata
->vif
.bss_conf
.beacon_int
= params
->beacon_interval
;
1084 sdata
->u
.ibss
.channel
= params
->chandef
.chan
;
1085 sdata
->u
.ibss
.channel_type
=
1086 cfg80211_get_chandef_type(¶ms
->chandef
);
1087 sdata
->u
.ibss
.fixed_channel
= params
->channel_fixed
;
1090 sdata
->u
.ibss
.ie
= kmemdup(params
->ie
, params
->ie_len
,
1092 if (sdata
->u
.ibss
.ie
)
1093 sdata
->u
.ibss
.ie_len
= params
->ie_len
;
1096 sdata
->u
.ibss
.skb
= skb
;
1097 sdata
->u
.ibss
.state
= IEEE80211_IBSS_MLME_SEARCH
;
1098 sdata
->u
.ibss
.ibss_join_req
= jiffies
;
1100 memcpy(sdata
->u
.ibss
.ssid
, params
->ssid
, params
->ssid_len
);
1101 sdata
->u
.ibss
.ssid_len
= params
->ssid_len
;
1103 mutex_unlock(&sdata
->u
.ibss
.mtx
);
1105 mutex_lock(&sdata
->local
->mtx
);
1106 ieee80211_recalc_idle(sdata
->local
);
1107 mutex_unlock(&sdata
->local
->mtx
);
1110 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1111 * reserved, but an HT STA shall protect HT transmissions as though
1112 * the HT Protection field were set to non-HT mixed mode.
1114 * In an IBSS, the RIFS Mode field of the HT Operation element is
1115 * also reserved, but an HT STA shall operate as though this field
1119 sdata
->vif
.bss_conf
.ht_operation_mode
|=
1120 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1121 | IEEE80211_HT_PARAM_RIFS_MODE
;
1123 changed
|= BSS_CHANGED_HT
;
1124 ieee80211_bss_info_change_notify(sdata
, changed
);
1126 sdata
->smps_mode
= IEEE80211_SMPS_OFF
;
1127 sdata
->needed_rx_chains
= sdata
->local
->rx_chains
;
1129 ieee80211_queue_work(&sdata
->local
->hw
, &sdata
->work
);
1134 int ieee80211_ibss_leave(struct ieee80211_sub_if_data
*sdata
)
1136 struct sk_buff
*skb
;
1137 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
1138 struct ieee80211_local
*local
= sdata
->local
;
1139 struct cfg80211_bss
*cbss
;
1142 struct sta_info
*sta
;
1144 mutex_lock(&sdata
->u
.ibss
.mtx
);
1146 active_ibss
= ieee80211_sta_active_ibss(sdata
);
1148 if (!active_ibss
&& !is_zero_ether_addr(ifibss
->bssid
)) {
1149 capability
= WLAN_CAPABILITY_IBSS
;
1151 if (ifibss
->privacy
)
1152 capability
|= WLAN_CAPABILITY_PRIVACY
;
1154 cbss
= cfg80211_get_bss(local
->hw
.wiphy
, ifibss
->channel
,
1155 ifibss
->bssid
, ifibss
->ssid
,
1156 ifibss
->ssid_len
, WLAN_CAPABILITY_IBSS
|
1157 WLAN_CAPABILITY_PRIVACY
,
1161 cfg80211_unlink_bss(local
->hw
.wiphy
, cbss
);
1162 cfg80211_put_bss(cbss
);
1166 ifibss
->state
= IEEE80211_IBSS_MLME_SEARCH
;
1167 memset(ifibss
->bssid
, 0, ETH_ALEN
);
1168 ifibss
->ssid_len
= 0;
1170 sta_info_flush(sdata
);
1172 spin_lock_bh(&ifibss
->incomplete_lock
);
1173 while (!list_empty(&ifibss
->incomplete_stations
)) {
1174 sta
= list_first_entry(&ifibss
->incomplete_stations
,
1175 struct sta_info
, list
);
1176 list_del(&sta
->list
);
1177 spin_unlock_bh(&ifibss
->incomplete_lock
);
1179 sta_info_free(local
, sta
);
1180 spin_lock_bh(&ifibss
->incomplete_lock
);
1182 spin_unlock_bh(&ifibss
->incomplete_lock
);
1184 netif_carrier_off(sdata
->dev
);
1187 kfree(sdata
->u
.ibss
.ie
);
1188 skb
= rcu_dereference_protected(sdata
->u
.ibss
.presp
,
1189 lockdep_is_held(&sdata
->u
.ibss
.mtx
));
1190 RCU_INIT_POINTER(sdata
->u
.ibss
.presp
, NULL
);
1191 sdata
->vif
.bss_conf
.ibss_joined
= false;
1192 sdata
->vif
.bss_conf
.ibss_creator
= false;
1193 sdata
->vif
.bss_conf
.enable_beacon
= false;
1194 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED
, &sdata
->state
);
1195 ieee80211_bss_info_change_notify(sdata
, BSS_CHANGED_BEACON_ENABLED
|
1200 skb_queue_purge(&sdata
->skb_queue
);
1202 del_timer_sync(&sdata
->u
.ibss
.timer
);
1204 mutex_unlock(&sdata
->u
.ibss
.mtx
);
1206 mutex_lock(&local
->mtx
);
1207 ieee80211_recalc_idle(sdata
->local
);
1208 mutex_unlock(&local
->mtx
);