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_SCAN_INTERVAL_SLOW (15 * HZ)
30 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
32 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
33 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
35 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
38 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data
*sdata
,
39 const u8
*bssid
, const int beacon_int
,
40 struct ieee80211_channel
*chan
,
41 const u32 basic_rates
,
42 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 enum nl80211_channel_type channel_type
;
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
->local
, 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 netif_carrier_off(sdata
->dev
);
76 ieee80211_bss_info_change_notify(sdata
, BSS_CHANGED_IBSS
);
79 memcpy(ifibss
->bssid
, bssid
, ETH_ALEN
);
81 sdata
->drop_unencrypted
= capability
& WLAN_CAPABILITY_PRIVACY
? 1 : 0;
83 local
->oper_channel
= chan
;
84 channel_type
= ifibss
->channel_type
;
85 if (!cfg80211_can_beacon_sec_chan(local
->hw
.wiphy
, chan
, channel_type
))
86 channel_type
= NL80211_CHAN_HT20
;
87 if (!ieee80211_set_channel_type(local
, sdata
, channel_type
)) {
88 /* can only fail due to HT40+/- mismatch */
89 channel_type
= NL80211_CHAN_HT20
;
90 WARN_ON(!ieee80211_set_channel_type(local
, sdata
,
93 ieee80211_hw_config(local
, IEEE80211_CONF_CHANGE_CHANNEL
);
95 sband
= local
->hw
.wiphy
->bands
[chan
->band
];
97 /* build supported rates array */
99 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
100 int rate
= sband
->bitrates
[i
].bitrate
;
102 if (basic_rates
& BIT(i
))
104 *pos
++ = basic
| (u8
) (rate
/ 5);
107 /* Build IBSS probe response */
108 mgmt
= (void *) skb_put(skb
, 24 + sizeof(mgmt
->u
.beacon
));
109 memset(mgmt
, 0, 24 + sizeof(mgmt
->u
.beacon
));
110 mgmt
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
111 IEEE80211_STYPE_PROBE_RESP
);
112 eth_broadcast_addr(mgmt
->da
);
113 memcpy(mgmt
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
114 memcpy(mgmt
->bssid
, ifibss
->bssid
, ETH_ALEN
);
115 mgmt
->u
.beacon
.beacon_int
= cpu_to_le16(beacon_int
);
116 mgmt
->u
.beacon
.timestamp
= cpu_to_le64(tsf
);
117 mgmt
->u
.beacon
.capab_info
= cpu_to_le16(capability
);
119 pos
= skb_put(skb
, 2 + ifibss
->ssid_len
);
120 *pos
++ = WLAN_EID_SSID
;
121 *pos
++ = ifibss
->ssid_len
;
122 memcpy(pos
, ifibss
->ssid
, ifibss
->ssid_len
);
124 rates
= sband
->n_bitrates
;
127 pos
= skb_put(skb
, 2 + rates
);
128 *pos
++ = WLAN_EID_SUPP_RATES
;
130 memcpy(pos
, supp_rates
, rates
);
132 if (sband
->band
== IEEE80211_BAND_2GHZ
) {
133 pos
= skb_put(skb
, 2 + 1);
134 *pos
++ = WLAN_EID_DS_PARAMS
;
136 *pos
++ = ieee80211_frequency_to_channel(chan
->center_freq
);
139 pos
= skb_put(skb
, 2 + 2);
140 *pos
++ = WLAN_EID_IBSS_PARAMS
;
142 /* FIX: set ATIM window based on scan results */
146 if (sband
->n_bitrates
> 8) {
147 rates
= sband
->n_bitrates
- 8;
148 pos
= skb_put(skb
, 2 + rates
);
149 *pos
++ = WLAN_EID_EXT_SUPP_RATES
;
151 memcpy(pos
, &supp_rates
[8], rates
);
155 memcpy(skb_put(skb
, ifibss
->ie_len
),
156 ifibss
->ie
, ifibss
->ie_len
);
158 /* add HT capability and information IEs */
159 if (channel_type
&& sband
->ht_cap
.ht_supported
) {
160 pos
= skb_put(skb
, 4 +
161 sizeof(struct ieee80211_ht_cap
) +
162 sizeof(struct ieee80211_ht_operation
));
163 pos
= ieee80211_ie_build_ht_cap(pos
, &sband
->ht_cap
,
166 * Note: According to 802.11n-2009 9.13.3.1, HT Protection
167 * field and RIFS Mode are reserved in IBSS mode, therefore
170 pos
= ieee80211_ie_build_ht_oper(pos
, &sband
->ht_cap
,
171 chan
, channel_type
, 0);
174 if (local
->hw
.queues
>= IEEE80211_NUM_ACS
) {
175 pos
= skb_put(skb
, 9);
176 *pos
++ = WLAN_EID_VENDOR_SPECIFIC
;
177 *pos
++ = 7; /* len */
178 *pos
++ = 0x00; /* Microsoft OUI 00:50:F2 */
181 *pos
++ = 2; /* WME */
182 *pos
++ = 0; /* WME info */
183 *pos
++ = 1; /* WME ver */
184 *pos
++ = 0; /* U-APSD no in use */
187 rcu_assign_pointer(ifibss
->presp
, skb
);
189 sdata
->vif
.bss_conf
.beacon_int
= beacon_int
;
190 sdata
->vif
.bss_conf
.basic_rates
= basic_rates
;
191 bss_change
= BSS_CHANGED_BEACON_INT
;
192 bss_change
|= ieee80211_reset_erp_info(sdata
);
193 bss_change
|= BSS_CHANGED_BSSID
;
194 bss_change
|= BSS_CHANGED_BEACON
;
195 bss_change
|= BSS_CHANGED_BEACON_ENABLED
;
196 bss_change
|= BSS_CHANGED_BASIC_RATES
;
197 bss_change
|= BSS_CHANGED_HT
;
198 bss_change
|= BSS_CHANGED_IBSS
;
199 sdata
->vif
.bss_conf
.ibss_joined
= true;
200 ieee80211_bss_info_change_notify(sdata
, bss_change
);
202 ieee80211_sta_def_wmm_params(sdata
, sband
->n_bitrates
, supp_rates
);
204 ifibss
->state
= IEEE80211_IBSS_MLME_JOINED
;
205 mod_timer(&ifibss
->timer
,
206 round_jiffies(jiffies
+ IEEE80211_IBSS_MERGE_INTERVAL
));
208 bss
= cfg80211_inform_bss_frame(local
->hw
.wiphy
, chan
,
209 mgmt
, skb
->len
, 0, GFP_KERNEL
);
210 cfg80211_put_bss(bss
);
211 netif_carrier_on(sdata
->dev
);
212 cfg80211_ibss_joined(sdata
->dev
, ifibss
->bssid
, GFP_KERNEL
);
215 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data
*sdata
,
216 struct ieee80211_bss
*bss
)
218 struct cfg80211_bss
*cbss
=
219 container_of((void *)bss
, struct cfg80211_bss
, priv
);
220 struct ieee80211_supported_band
*sband
;
223 u16 beacon_int
= cbss
->beacon_interval
;
225 lockdep_assert_held(&sdata
->u
.ibss
.mtx
);
230 sband
= sdata
->local
->hw
.wiphy
->bands
[cbss
->channel
->band
];
234 for (i
= 0; i
< bss
->supp_rates_len
; i
++) {
235 int rate
= (bss
->supp_rates
[i
] & 0x7f) * 5;
236 bool is_basic
= !!(bss
->supp_rates
[i
] & 0x80);
238 for (j
= 0; j
< sband
->n_bitrates
; j
++) {
239 if (sband
->bitrates
[j
].bitrate
== rate
) {
241 basic_rates
|= BIT(j
);
247 __ieee80211_sta_join_ibss(sdata
, cbss
->bssid
,
255 static struct sta_info
*ieee80211_ibss_finish_sta(struct sta_info
*sta
,
259 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
262 memcpy(addr
, sta
->sta
.addr
, ETH_ALEN
);
264 ibss_dbg(sdata
, "Adding new IBSS station %pM\n", addr
);
266 sta_info_pre_move_state(sta
, IEEE80211_STA_AUTH
);
267 sta_info_pre_move_state(sta
, IEEE80211_STA_ASSOC
);
268 /* authorize the station only if the network is not RSN protected. If
269 * not wait for the userspace to authorize it */
270 if (!sta
->sdata
->u
.ibss
.control_port
)
271 sta_info_pre_move_state(sta
, IEEE80211_STA_AUTHORIZED
);
273 rate_control_rate_init(sta
);
275 /* If it fails, maybe we raced another insertion? */
276 if (sta_info_insert_rcu(sta
))
277 return sta_info_get(sdata
, addr
);
278 if (auth
&& !sdata
->u
.ibss
.auth_frame_registrations
) {
280 "TX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=1)\n",
281 sdata
->vif
.addr
, addr
, sdata
->u
.ibss
.bssid
);
282 ieee80211_send_auth(sdata
, 1, WLAN_AUTH_OPEN
, NULL
, 0,
283 addr
, sdata
->u
.ibss
.bssid
, NULL
, 0, 0);
288 static struct sta_info
*
289 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data
*sdata
,
290 const u8
*bssid
, const u8
*addr
,
291 u32 supp_rates
, bool auth
)
294 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
295 struct ieee80211_local
*local
= sdata
->local
;
296 struct sta_info
*sta
;
297 int band
= local
->oper_channel
->band
;
300 * XXX: Consider removing the least recently used entry and
301 * allow new one to be added.
303 if (local
->num_sta
>= IEEE80211_IBSS_MAX_STA_ENTRIES
) {
304 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
310 if (ifibss
->state
== IEEE80211_IBSS_MLME_SEARCH
) {
315 if (!ether_addr_equal(bssid
, sdata
->u
.ibss
.bssid
)) {
320 sta
= sta_info_alloc(sdata
, addr
, GFP_KERNEL
);
326 sta
->last_rx
= jiffies
;
328 /* make sure mandatory rates are always added */
329 sta
->sta
.supp_rates
[band
] = supp_rates
|
330 ieee80211_mandatory_rates(local
, band
);
332 return ieee80211_ibss_finish_sta(sta
, auth
);
335 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data
*sdata
,
336 struct ieee80211_mgmt
*mgmt
,
339 u16 reason
= le16_to_cpu(mgmt
->u
.deauth
.reason_code
);
341 if (len
< IEEE80211_DEAUTH_FRAME_LEN
)
344 ibss_dbg(sdata
, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
345 mgmt
->sa
, mgmt
->da
, mgmt
->bssid
, reason
);
346 sta_info_destroy_addr(sdata
, mgmt
->sa
);
349 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data
*sdata
,
350 struct ieee80211_mgmt
*mgmt
,
353 u16 auth_alg
, auth_transaction
;
354 struct sta_info
*sta
;
355 u8 deauth_frame_buf
[IEEE80211_DEAUTH_FRAME_LEN
];
357 lockdep_assert_held(&sdata
->u
.ibss
.mtx
);
362 auth_alg
= le16_to_cpu(mgmt
->u
.auth
.auth_alg
);
363 auth_transaction
= le16_to_cpu(mgmt
->u
.auth
.auth_transaction
);
365 if (auth_alg
!= WLAN_AUTH_OPEN
|| auth_transaction
!= 1)
368 "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
369 mgmt
->sa
, mgmt
->da
, mgmt
->bssid
, auth_transaction
);
370 sta_info_destroy_addr(sdata
, mgmt
->sa
);
371 sta
= ieee80211_ibss_add_sta(sdata
, mgmt
->bssid
, mgmt
->sa
, 0, false);
375 * if we have any problem in allocating the new station, we reply with a
376 * DEAUTH frame to tell the other end that we had a problem
379 ieee80211_send_deauth_disassoc(sdata
, sdata
->u
.ibss
.bssid
,
380 IEEE80211_STYPE_DEAUTH
,
381 WLAN_REASON_UNSPECIFIED
, true,
387 * IEEE 802.11 standard does not require authentication in IBSS
388 * networks and most implementations do not seem to use it.
389 * However, try to reply to authentication attempts if someone
390 * has actually implemented this.
392 ieee80211_send_auth(sdata
, 2, WLAN_AUTH_OPEN
, NULL
, 0,
393 mgmt
->sa
, sdata
->u
.ibss
.bssid
, NULL
, 0, 0);
396 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data
*sdata
,
397 struct ieee80211_mgmt
*mgmt
,
399 struct ieee80211_rx_status
*rx_status
,
400 struct ieee802_11_elems
*elems
,
403 struct ieee80211_local
*local
= sdata
->local
;
405 struct cfg80211_bss
*cbss
;
406 struct ieee80211_bss
*bss
;
407 struct sta_info
*sta
;
408 struct ieee80211_channel
*channel
;
409 u64 beacon_timestamp
, rx_timestamp
;
411 enum ieee80211_band band
= rx_status
->band
;
412 struct ieee80211_supported_band
*sband
= local
->hw
.wiphy
->bands
[band
];
413 bool rates_updated
= false;
415 if (elems
->ds_params
&& elems
->ds_params_len
== 1)
416 freq
= ieee80211_channel_to_frequency(elems
->ds_params
[0],
419 freq
= rx_status
->freq
;
421 channel
= ieee80211_get_channel(local
->hw
.wiphy
, freq
);
423 if (!channel
|| channel
->flags
& IEEE80211_CHAN_DISABLED
)
426 if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
&&
427 ether_addr_equal(mgmt
->bssid
, sdata
->u
.ibss
.bssid
)) {
430 sta
= sta_info_get(sdata
, mgmt
->sa
);
432 if (elems
->supp_rates
) {
433 supp_rates
= ieee80211_sta_get_rates(local
, elems
,
438 prev_rates
= sta
->sta
.supp_rates
[band
];
439 /* make sure mandatory rates are always added */
440 sta
->sta
.supp_rates
[band
] = supp_rates
|
441 ieee80211_mandatory_rates(local
, band
);
443 if (sta
->sta
.supp_rates
[band
] != prev_rates
) {
445 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
446 sta
->sta
.addr
, prev_rates
,
447 sta
->sta
.supp_rates
[band
]);
448 rates_updated
= true;
452 sta
= ieee80211_ibss_add_sta(sdata
, mgmt
->bssid
,
453 mgmt
->sa
, supp_rates
, true);
457 if (sta
&& elems
->wmm_info
)
458 set_sta_flag(sta
, WLAN_STA_WME
);
460 if (sta
&& elems
->ht_operation
&& elems
->ht_cap_elem
&&
461 sdata
->u
.ibss
.channel_type
!= NL80211_CHAN_NO_HT
) {
463 struct ieee80211_sta_ht_cap sta_ht_cap_new
;
464 enum nl80211_channel_type channel_type
=
465 ieee80211_ht_oper_to_channel_type(
466 elems
->ht_operation
);
468 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata
, sband
,
473 * fall back to HT20 if we don't use or use
474 * the other extension channel
476 if (!(channel_type
== NL80211_CHAN_HT40MINUS
||
477 channel_type
== NL80211_CHAN_HT40PLUS
) ||
478 channel_type
!= sdata
->u
.ibss
.channel_type
)
479 sta_ht_cap_new
.cap
&=
480 ~IEEE80211_HT_CAP_SUP_WIDTH_20_40
;
482 if (memcmp(&sta
->sta
.ht_cap
, &sta_ht_cap_new
,
483 sizeof(sta_ht_cap_new
))) {
484 memcpy(&sta
->sta
.ht_cap
, &sta_ht_cap_new
,
485 sizeof(sta_ht_cap_new
));
486 rates_updated
= true;
490 if (sta
&& rates_updated
) {
491 drv_sta_rc_update(local
, sdata
, &sta
->sta
,
492 IEEE80211_RC_SUPP_RATES_CHANGED
);
493 rate_control_rate_init(sta
);
499 bss
= ieee80211_bss_info_update(local
, rx_status
, mgmt
, len
, elems
,
504 cbss
= container_of((void *)bss
, struct cfg80211_bss
, priv
);
506 /* was just updated in ieee80211_bss_info_update */
507 beacon_timestamp
= cbss
->tsf
;
509 /* check if we need to merge IBSS */
511 /* we use a fixed BSSID */
512 if (sdata
->u
.ibss
.fixed_bssid
)
516 if (!(cbss
->capability
& WLAN_CAPABILITY_IBSS
))
519 /* different channel */
520 if (cbss
->channel
!= local
->oper_channel
)
524 if (elems
->ssid_len
!= sdata
->u
.ibss
.ssid_len
||
525 memcmp(elems
->ssid
, sdata
->u
.ibss
.ssid
,
526 sdata
->u
.ibss
.ssid_len
))
530 if (ether_addr_equal(cbss
->bssid
, sdata
->u
.ibss
.bssid
))
533 if (rx_status
->flag
& RX_FLAG_MACTIME_MPDU
) {
535 * For correct IBSS merging we need mactime; since mactime is
536 * defined as the time the first data symbol of the frame hits
537 * the PHY, and the timestamp of the beacon is defined as "the
538 * time that the data symbol containing the first bit of the
539 * timestamp is transmitted to the PHY plus the transmitting
540 * STA's delays through its local PHY from the MAC-PHY
541 * interface to its interface with the WM" (802.11 11.1.2)
542 * - equals the time this bit arrives at the receiver - we have
543 * to take into account the offset between the two.
545 * E.g. at 1 MBit that means mactime is 192 usec earlier
546 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
550 if (rx_status
->flag
& RX_FLAG_HT
)
551 rate
= 65; /* TODO: HT rates */
553 rate
= local
->hw
.wiphy
->bands
[band
]->
554 bitrates
[rx_status
->rate_idx
].bitrate
;
556 rx_timestamp
= rx_status
->mactime
+ (24 * 8 * 10 / rate
);
559 * second best option: get current TSF
560 * (will return -1 if not supported)
562 rx_timestamp
= drv_get_tsf(local
, sdata
);
566 "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
567 mgmt
->sa
, mgmt
->bssid
,
568 (unsigned long long)rx_timestamp
,
569 (unsigned long long)beacon_timestamp
,
570 (unsigned long long)(rx_timestamp
- beacon_timestamp
),
573 if (beacon_timestamp
> rx_timestamp
) {
575 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
577 ieee80211_sta_join_ibss(sdata
, bss
);
578 supp_rates
= ieee80211_sta_get_rates(local
, elems
, band
, NULL
);
579 ieee80211_ibss_add_sta(sdata
, mgmt
->bssid
, mgmt
->sa
,
585 ieee80211_rx_bss_put(local
, bss
);
588 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data
*sdata
,
589 const u8
*bssid
, const u8
*addr
,
592 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
593 struct ieee80211_local
*local
= sdata
->local
;
594 struct sta_info
*sta
;
595 int band
= local
->oper_channel
->band
;
598 * XXX: Consider removing the least recently used entry and
599 * allow new one to be added.
601 if (local
->num_sta
>= IEEE80211_IBSS_MAX_STA_ENTRIES
) {
602 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
607 if (ifibss
->state
== IEEE80211_IBSS_MLME_SEARCH
)
610 if (!ether_addr_equal(bssid
, sdata
->u
.ibss
.bssid
))
613 sta
= sta_info_alloc(sdata
, addr
, GFP_ATOMIC
);
617 sta
->last_rx
= jiffies
;
619 /* make sure mandatory rates are always added */
620 sta
->sta
.supp_rates
[band
] = supp_rates
|
621 ieee80211_mandatory_rates(local
, band
);
623 spin_lock(&ifibss
->incomplete_lock
);
624 list_add(&sta
->list
, &ifibss
->incomplete_stations
);
625 spin_unlock(&ifibss
->incomplete_lock
);
626 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
629 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data
*sdata
)
631 struct ieee80211_local
*local
= sdata
->local
;
633 struct sta_info
*sta
;
635 lockdep_assert_held(&sdata
->u
.ibss
.mtx
);
639 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
640 if (sta
->sdata
== sdata
&&
641 time_after(sta
->last_rx
+ IEEE80211_IBSS_MERGE_INTERVAL
,
654 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
657 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data
*sdata
)
659 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
661 lockdep_assert_held(&ifibss
->mtx
);
663 mod_timer(&ifibss
->timer
,
664 round_jiffies(jiffies
+ IEEE80211_IBSS_MERGE_INTERVAL
));
666 ieee80211_sta_expire(sdata
, IEEE80211_IBSS_INACTIVITY_LIMIT
);
668 if (time_before(jiffies
, ifibss
->last_scan_completed
+
669 IEEE80211_IBSS_MERGE_INTERVAL
))
672 if (ieee80211_sta_active_ibss(sdata
))
675 if (ifibss
->fixed_channel
)
679 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
681 ieee80211_request_internal_scan(sdata
,
682 ifibss
->ssid
, ifibss
->ssid_len
, NULL
);
685 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data
*sdata
)
687 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
692 lockdep_assert_held(&ifibss
->mtx
);
694 if (ifibss
->fixed_bssid
) {
695 memcpy(bssid
, ifibss
->bssid
, ETH_ALEN
);
697 /* Generate random, not broadcast, locally administered BSSID. Mix in
698 * own MAC address to make sure that devices that do not have proper
699 * random number generator get different BSSID. */
700 get_random_bytes(bssid
, ETH_ALEN
);
701 for (i
= 0; i
< ETH_ALEN
; i
++)
702 bssid
[i
] ^= sdata
->vif
.addr
[i
];
707 sdata_info(sdata
, "Creating new IBSS network, BSSID %pM\n", bssid
);
709 capability
= WLAN_CAPABILITY_IBSS
;
712 capability
|= WLAN_CAPABILITY_PRIVACY
;
714 sdata
->drop_unencrypted
= 0;
716 __ieee80211_sta_join_ibss(sdata
, bssid
, sdata
->vif
.bss_conf
.beacon_int
,
717 ifibss
->channel
, ifibss
->basic_rates
,
722 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
725 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data
*sdata
)
727 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
728 struct ieee80211_local
*local
= sdata
->local
;
729 struct cfg80211_bss
*cbss
;
730 struct ieee80211_channel
*chan
= NULL
;
731 const u8
*bssid
= NULL
;
735 lockdep_assert_held(&ifibss
->mtx
);
737 active_ibss
= ieee80211_sta_active_ibss(sdata
);
738 ibss_dbg(sdata
, "sta_find_ibss (active_ibss=%d)\n", active_ibss
);
743 capability
= WLAN_CAPABILITY_IBSS
;
745 capability
|= WLAN_CAPABILITY_PRIVACY
;
746 if (ifibss
->fixed_bssid
)
747 bssid
= ifibss
->bssid
;
748 if (ifibss
->fixed_channel
)
749 chan
= ifibss
->channel
;
750 if (!is_zero_ether_addr(ifibss
->bssid
))
751 bssid
= ifibss
->bssid
;
752 cbss
= cfg80211_get_bss(local
->hw
.wiphy
, chan
, bssid
,
753 ifibss
->ssid
, ifibss
->ssid_len
,
754 WLAN_CAPABILITY_IBSS
| WLAN_CAPABILITY_PRIVACY
,
758 struct ieee80211_bss
*bss
;
760 bss
= (void *)cbss
->priv
;
762 "sta_find_ibss: selected %pM current %pM\n",
763 cbss
->bssid
, ifibss
->bssid
);
765 "Selected IBSS BSSID %pM based on configured SSID\n",
768 ieee80211_sta_join_ibss(sdata
, bss
);
769 ieee80211_rx_bss_put(local
, bss
);
773 ibss_dbg(sdata
, "sta_find_ibss: did not try to join ibss\n");
775 /* Selected IBSS not found in current scan results - try to scan */
776 if (time_after(jiffies
, ifibss
->last_scan_completed
+
777 IEEE80211_SCAN_INTERVAL
)) {
778 sdata_info(sdata
, "Trigger new scan to find an IBSS to join\n");
780 ieee80211_request_internal_scan(sdata
,
781 ifibss
->ssid
, ifibss
->ssid_len
,
782 ifibss
->fixed_channel
? ifibss
->channel
: NULL
);
784 int interval
= IEEE80211_SCAN_INTERVAL
;
786 if (time_after(jiffies
, ifibss
->ibss_join_req
+
787 IEEE80211_IBSS_JOIN_TIMEOUT
)) {
788 if (!(local
->oper_channel
->flags
& IEEE80211_CHAN_NO_IBSS
)) {
789 ieee80211_sta_create_ibss(sdata
);
792 sdata_info(sdata
, "IBSS not allowed on %d MHz\n",
793 local
->oper_channel
->center_freq
);
795 /* No IBSS found - decrease scan interval and continue
797 interval
= IEEE80211_SCAN_INTERVAL_SLOW
;
800 mod_timer(&ifibss
->timer
,
801 round_jiffies(jiffies
+ interval
));
805 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data
*sdata
,
808 struct ieee80211_mgmt
*mgmt
= (void *)req
->data
;
809 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
810 struct ieee80211_local
*local
= sdata
->local
;
811 int tx_last_beacon
, len
= req
->len
;
813 struct ieee80211_mgmt
*resp
;
814 struct sk_buff
*presp
;
817 lockdep_assert_held(&ifibss
->mtx
);
819 presp
= rcu_dereference_protected(ifibss
->presp
,
820 lockdep_is_held(&ifibss
->mtx
));
822 if (ifibss
->state
!= IEEE80211_IBSS_MLME_JOINED
||
823 len
< 24 + 2 || !presp
)
826 tx_last_beacon
= drv_tx_last_beacon(local
);
829 "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
830 mgmt
->sa
, mgmt
->da
, mgmt
->bssid
, tx_last_beacon
);
832 if (!tx_last_beacon
&& is_multicast_ether_addr(mgmt
->da
))
835 if (!ether_addr_equal(mgmt
->bssid
, ifibss
->bssid
) &&
836 !is_broadcast_ether_addr(mgmt
->bssid
))
839 end
= ((u8
*) mgmt
) + len
;
840 pos
= mgmt
->u
.probe_req
.variable
;
841 if (pos
[0] != WLAN_EID_SSID
||
842 pos
+ 2 + pos
[1] > end
) {
843 ibss_dbg(sdata
, "Invalid SSID IE in ProbeReq from %pM\n",
848 (pos
[1] != ifibss
->ssid_len
||
849 memcmp(pos
+ 2, ifibss
->ssid
, ifibss
->ssid_len
))) {
850 /* Ignore ProbeReq for foreign SSID */
854 /* Reply with ProbeResp */
855 skb
= skb_copy(presp
, GFP_KERNEL
);
859 resp
= (struct ieee80211_mgmt
*) skb
->data
;
860 memcpy(resp
->da
, mgmt
->sa
, ETH_ALEN
);
861 ibss_dbg(sdata
, "Sending ProbeResp to %pM\n", resp
->da
);
862 IEEE80211_SKB_CB(skb
)->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
863 ieee80211_tx_skb(sdata
, skb
);
866 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data
*sdata
,
867 struct ieee80211_mgmt
*mgmt
,
869 struct ieee80211_rx_status
*rx_status
)
872 struct ieee802_11_elems elems
;
874 baselen
= (u8
*) mgmt
->u
.probe_resp
.variable
- (u8
*) mgmt
;
878 ieee802_11_parse_elems(mgmt
->u
.probe_resp
.variable
, len
- baselen
,
881 ieee80211_rx_bss_info(sdata
, mgmt
, len
, rx_status
, &elems
, false);
884 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data
*sdata
,
885 struct ieee80211_mgmt
*mgmt
,
887 struct ieee80211_rx_status
*rx_status
)
890 struct ieee802_11_elems elems
;
892 /* Process beacon from the current BSS */
893 baselen
= (u8
*) mgmt
->u
.beacon
.variable
- (u8
*) mgmt
;
897 ieee802_11_parse_elems(mgmt
->u
.beacon
.variable
, len
- baselen
, &elems
);
899 ieee80211_rx_bss_info(sdata
, mgmt
, len
, rx_status
, &elems
, true);
902 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data
*sdata
,
905 struct ieee80211_rx_status
*rx_status
;
906 struct ieee80211_mgmt
*mgmt
;
909 rx_status
= IEEE80211_SKB_RXCB(skb
);
910 mgmt
= (struct ieee80211_mgmt
*) skb
->data
;
911 fc
= le16_to_cpu(mgmt
->frame_control
);
913 mutex_lock(&sdata
->u
.ibss
.mtx
);
915 if (!sdata
->u
.ibss
.ssid_len
)
916 goto mgmt_out
; /* not ready to merge yet */
918 switch (fc
& IEEE80211_FCTL_STYPE
) {
919 case IEEE80211_STYPE_PROBE_REQ
:
920 ieee80211_rx_mgmt_probe_req(sdata
, skb
);
922 case IEEE80211_STYPE_PROBE_RESP
:
923 ieee80211_rx_mgmt_probe_resp(sdata
, mgmt
, skb
->len
,
926 case IEEE80211_STYPE_BEACON
:
927 ieee80211_rx_mgmt_beacon(sdata
, mgmt
, skb
->len
,
930 case IEEE80211_STYPE_AUTH
:
931 ieee80211_rx_mgmt_auth_ibss(sdata
, mgmt
, skb
->len
);
933 case IEEE80211_STYPE_DEAUTH
:
934 ieee80211_rx_mgmt_deauth_ibss(sdata
, mgmt
, skb
->len
);
939 mutex_unlock(&sdata
->u
.ibss
.mtx
);
942 void ieee80211_ibss_work(struct ieee80211_sub_if_data
*sdata
)
944 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
945 struct sta_info
*sta
;
947 mutex_lock(&ifibss
->mtx
);
950 * Work could be scheduled after scan or similar
951 * when we aren't even joined (or trying) with a
954 if (!ifibss
->ssid_len
)
957 spin_lock_bh(&ifibss
->incomplete_lock
);
958 while (!list_empty(&ifibss
->incomplete_stations
)) {
959 sta
= list_first_entry(&ifibss
->incomplete_stations
,
960 struct sta_info
, list
);
961 list_del(&sta
->list
);
962 spin_unlock_bh(&ifibss
->incomplete_lock
);
964 ieee80211_ibss_finish_sta(sta
, true);
966 spin_lock_bh(&ifibss
->incomplete_lock
);
968 spin_unlock_bh(&ifibss
->incomplete_lock
);
970 switch (ifibss
->state
) {
971 case IEEE80211_IBSS_MLME_SEARCH
:
972 ieee80211_sta_find_ibss(sdata
);
974 case IEEE80211_IBSS_MLME_JOINED
:
975 ieee80211_sta_merge_ibss(sdata
);
983 mutex_unlock(&ifibss
->mtx
);
986 static void ieee80211_ibss_timer(unsigned long data
)
988 struct ieee80211_sub_if_data
*sdata
=
989 (struct ieee80211_sub_if_data
*) data
;
990 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
991 struct ieee80211_local
*local
= sdata
->local
;
993 if (local
->quiescing
) {
994 ifibss
->timer_running
= true;
998 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
1002 void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data
*sdata
)
1004 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
1006 if (del_timer_sync(&ifibss
->timer
))
1007 ifibss
->timer_running
= true;
1010 void ieee80211_ibss_restart(struct ieee80211_sub_if_data
*sdata
)
1012 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
1014 if (ifibss
->timer_running
) {
1015 add_timer(&ifibss
->timer
);
1016 ifibss
->timer_running
= false;
1021 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data
*sdata
)
1023 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
1025 setup_timer(&ifibss
->timer
, ieee80211_ibss_timer
,
1026 (unsigned long) sdata
);
1027 mutex_init(&ifibss
->mtx
);
1028 INIT_LIST_HEAD(&ifibss
->incomplete_stations
);
1029 spin_lock_init(&ifibss
->incomplete_lock
);
1032 /* scan finished notification */
1033 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local
*local
)
1035 struct ieee80211_sub_if_data
*sdata
;
1037 mutex_lock(&local
->iflist_mtx
);
1038 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
1039 if (!ieee80211_sdata_running(sdata
))
1041 if (sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
1043 sdata
->u
.ibss
.last_scan_completed
= jiffies
;
1044 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
1046 mutex_unlock(&local
->iflist_mtx
);
1049 int ieee80211_ibss_join(struct ieee80211_sub_if_data
*sdata
,
1050 struct cfg80211_ibss_params
*params
)
1052 struct sk_buff
*skb
;
1055 skb
= dev_alloc_skb(sdata
->local
->hw
.extra_tx_headroom
+
1056 sizeof(struct ieee80211_hdr_3addr
) +
1057 12 /* struct ieee80211_mgmt.u.beacon */ +
1058 2 + IEEE80211_MAX_SSID_LEN
/* max SSID */ +
1059 2 + 8 /* max Supported Rates */ +
1060 3 /* max DS params */ +
1061 4 /* IBSS params */ +
1062 2 + (IEEE80211_MAX_SUPP_RATES
- 8) +
1063 2 + sizeof(struct ieee80211_ht_cap
) +
1064 2 + sizeof(struct ieee80211_ht_operation
) +
1069 mutex_lock(&sdata
->u
.ibss
.mtx
);
1071 if (params
->bssid
) {
1072 memcpy(sdata
->u
.ibss
.bssid
, params
->bssid
, ETH_ALEN
);
1073 sdata
->u
.ibss
.fixed_bssid
= true;
1075 sdata
->u
.ibss
.fixed_bssid
= false;
1077 sdata
->u
.ibss
.privacy
= params
->privacy
;
1078 sdata
->u
.ibss
.control_port
= params
->control_port
;
1079 sdata
->u
.ibss
.basic_rates
= params
->basic_rates
;
1080 memcpy(sdata
->vif
.bss_conf
.mcast_rate
, params
->mcast_rate
,
1081 sizeof(params
->mcast_rate
));
1083 sdata
->vif
.bss_conf
.beacon_int
= params
->beacon_interval
;
1085 sdata
->u
.ibss
.channel
= params
->channel
;
1086 sdata
->u
.ibss
.channel_type
= params
->channel_type
;
1087 sdata
->u
.ibss
.fixed_channel
= params
->channel_fixed
;
1089 /* fix ourselves to that channel now already */
1090 if (params
->channel_fixed
) {
1091 sdata
->local
->oper_channel
= params
->channel
;
1092 if (!ieee80211_set_channel_type(sdata
->local
, sdata
,
1093 params
->channel_type
)) {
1094 mutex_unlock(&sdata
->u
.ibss
.mtx
);
1101 sdata
->u
.ibss
.ie
= kmemdup(params
->ie
, params
->ie_len
,
1103 if (sdata
->u
.ibss
.ie
)
1104 sdata
->u
.ibss
.ie_len
= params
->ie_len
;
1107 sdata
->u
.ibss
.skb
= skb
;
1108 sdata
->u
.ibss
.state
= IEEE80211_IBSS_MLME_SEARCH
;
1109 sdata
->u
.ibss
.ibss_join_req
= jiffies
;
1111 memcpy(sdata
->u
.ibss
.ssid
, params
->ssid
, IEEE80211_MAX_SSID_LEN
);
1112 sdata
->u
.ibss
.ssid_len
= params
->ssid_len
;
1114 mutex_unlock(&sdata
->u
.ibss
.mtx
);
1116 mutex_lock(&sdata
->local
->mtx
);
1117 ieee80211_recalc_idle(sdata
->local
);
1118 mutex_unlock(&sdata
->local
->mtx
);
1121 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1122 * reserved, but an HT STA shall protect HT transmissions as though
1123 * the HT Protection field were set to non-HT mixed mode.
1125 * In an IBSS, the RIFS Mode field of the HT Operation element is
1126 * also reserved, but an HT STA shall operate as though this field
1130 sdata
->vif
.bss_conf
.ht_operation_mode
|=
1131 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1132 | IEEE80211_HT_PARAM_RIFS_MODE
;
1134 changed
|= BSS_CHANGED_HT
;
1135 ieee80211_bss_info_change_notify(sdata
, changed
);
1137 ieee80211_queue_work(&sdata
->local
->hw
, &sdata
->work
);
1142 int ieee80211_ibss_leave(struct ieee80211_sub_if_data
*sdata
)
1144 struct sk_buff
*skb
;
1145 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
1146 struct ieee80211_local
*local
= sdata
->local
;
1147 struct cfg80211_bss
*cbss
;
1150 struct sta_info
*sta
;
1152 mutex_lock(&sdata
->u
.ibss
.mtx
);
1154 sdata
->u
.ibss
.state
= IEEE80211_IBSS_MLME_SEARCH
;
1155 memset(sdata
->u
.ibss
.bssid
, 0, ETH_ALEN
);
1156 sdata
->u
.ibss
.ssid_len
= 0;
1158 active_ibss
= ieee80211_sta_active_ibss(sdata
);
1160 if (!active_ibss
&& !is_zero_ether_addr(ifibss
->bssid
)) {
1161 capability
= WLAN_CAPABILITY_IBSS
;
1163 if (ifibss
->privacy
)
1164 capability
|= WLAN_CAPABILITY_PRIVACY
;
1166 cbss
= cfg80211_get_bss(local
->hw
.wiphy
, ifibss
->channel
,
1167 ifibss
->bssid
, ifibss
->ssid
,
1168 ifibss
->ssid_len
, WLAN_CAPABILITY_IBSS
|
1169 WLAN_CAPABILITY_PRIVACY
,
1173 cfg80211_unlink_bss(local
->hw
.wiphy
, cbss
);
1174 cfg80211_put_bss(cbss
);
1178 sta_info_flush(sdata
->local
, sdata
);
1180 spin_lock_bh(&ifibss
->incomplete_lock
);
1181 while (!list_empty(&ifibss
->incomplete_stations
)) {
1182 sta
= list_first_entry(&ifibss
->incomplete_stations
,
1183 struct sta_info
, list
);
1184 list_del(&sta
->list
);
1185 spin_unlock_bh(&ifibss
->incomplete_lock
);
1187 sta_info_free(local
, sta
);
1188 spin_lock_bh(&ifibss
->incomplete_lock
);
1190 spin_unlock_bh(&ifibss
->incomplete_lock
);
1192 netif_carrier_off(sdata
->dev
);
1195 kfree(sdata
->u
.ibss
.ie
);
1196 skb
= rcu_dereference_protected(sdata
->u
.ibss
.presp
,
1197 lockdep_is_held(&sdata
->u
.ibss
.mtx
));
1198 RCU_INIT_POINTER(sdata
->u
.ibss
.presp
, NULL
);
1199 sdata
->vif
.bss_conf
.ibss_joined
= false;
1200 ieee80211_bss_info_change_notify(sdata
, BSS_CHANGED_BEACON_ENABLED
|
1205 skb_queue_purge(&sdata
->skb_queue
);
1207 del_timer_sync(&sdata
->u
.ibss
.timer
);
1209 mutex_unlock(&sdata
->u
.ibss
.mtx
);
1211 mutex_lock(&local
->mtx
);
1212 ieee80211_recalc_idle(sdata
->local
);
1213 mutex_unlock(&local
->mtx
);