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>
23 #include <asm/unaligned.h>
25 #include "ieee80211_i.h"
26 #include "driver-ops.h"
29 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
30 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
31 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
33 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
34 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
36 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
39 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data
*sdata
,
40 struct ieee80211_mgmt
*mgmt
,
43 u16 auth_alg
, auth_transaction
;
45 lockdep_assert_held(&sdata
->u
.ibss
.mtx
);
50 auth_alg
= le16_to_cpu(mgmt
->u
.auth
.auth_alg
);
51 auth_transaction
= le16_to_cpu(mgmt
->u
.auth
.auth_transaction
);
54 * IEEE 802.11 standard does not require authentication in IBSS
55 * networks and most implementations do not seem to use it.
56 * However, try to reply to authentication attempts if someone
57 * has actually implemented this.
59 if (auth_alg
== WLAN_AUTH_OPEN
&& auth_transaction
== 1)
60 ieee80211_send_auth(sdata
, 2, WLAN_AUTH_OPEN
, NULL
, 0, mgmt
->sa
,
61 sdata
->u
.ibss
.bssid
, NULL
, 0, 0);
64 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data
*sdata
,
65 const u8
*bssid
, const int beacon_int
,
66 struct ieee80211_channel
*chan
,
67 const u32 basic_rates
,
68 const u16 capability
, u64 tsf
)
70 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
71 struct ieee80211_local
*local
= sdata
->local
;
74 struct ieee80211_mgmt
*mgmt
;
76 struct ieee80211_supported_band
*sband
;
77 struct cfg80211_bss
*bss
;
79 u8 supp_rates
[IEEE80211_MAX_SUPP_RATES
];
80 enum nl80211_channel_type channel_type
;
82 lockdep_assert_held(&ifibss
->mtx
);
84 /* Reset own TSF to allow time synchronization work. */
85 drv_reset_tsf(local
, sdata
);
88 RCU_INIT_POINTER(ifibss
->presp
, NULL
);
90 skb
->data
= skb
->head
;
92 skb_reset_tail_pointer(skb
);
93 skb_reserve(skb
, sdata
->local
->hw
.extra_tx_headroom
);
95 if (memcmp(ifibss
->bssid
, bssid
, ETH_ALEN
))
96 sta_info_flush(sdata
->local
, sdata
);
98 /* if merging, indicate to driver that we leave the old IBSS */
99 if (sdata
->vif
.bss_conf
.ibss_joined
) {
100 sdata
->vif
.bss_conf
.ibss_joined
= false;
101 netif_carrier_off(sdata
->dev
);
102 ieee80211_bss_info_change_notify(sdata
, BSS_CHANGED_IBSS
);
105 memcpy(ifibss
->bssid
, bssid
, ETH_ALEN
);
107 sdata
->drop_unencrypted
= capability
& WLAN_CAPABILITY_PRIVACY
? 1 : 0;
109 channel_type
= ifibss
->channel_type
;
110 if (channel_type
> NL80211_CHAN_HT20
&&
111 !cfg80211_can_beacon_sec_chan(local
->hw
.wiphy
, chan
, channel_type
))
112 channel_type
= NL80211_CHAN_HT20
;
113 if (!ieee80211_set_channel_type(local
, sdata
, channel_type
)) {
114 /* can only fail due to HT40+/- mismatch */
115 channel_type
= NL80211_CHAN_HT20
;
116 WARN_ON(!ieee80211_set_channel_type(local
, sdata
,
119 ieee80211_hw_config(local
, IEEE80211_CONF_CHANGE_CHANNEL
);
121 sband
= local
->hw
.wiphy
->bands
[chan
->band
];
123 /* build supported rates array */
125 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
126 int rate
= sband
->bitrates
[i
].bitrate
;
128 if (basic_rates
& BIT(i
))
130 *pos
++ = basic
| (u8
) (rate
/ 5);
133 /* Build IBSS probe response */
134 mgmt
= (void *) skb_put(skb
, 24 + sizeof(mgmt
->u
.beacon
));
135 memset(mgmt
, 0, 24 + sizeof(mgmt
->u
.beacon
));
136 mgmt
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
137 IEEE80211_STYPE_PROBE_RESP
);
138 memset(mgmt
->da
, 0xff, ETH_ALEN
);
139 memcpy(mgmt
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
140 memcpy(mgmt
->bssid
, ifibss
->bssid
, ETH_ALEN
);
141 mgmt
->u
.beacon
.beacon_int
= cpu_to_le16(beacon_int
);
142 mgmt
->u
.beacon
.timestamp
= cpu_to_le64(tsf
);
143 mgmt
->u
.beacon
.capab_info
= cpu_to_le16(capability
);
145 pos
= skb_put(skb
, 2 + ifibss
->ssid_len
);
146 *pos
++ = WLAN_EID_SSID
;
147 *pos
++ = ifibss
->ssid_len
;
148 memcpy(pos
, ifibss
->ssid
, ifibss
->ssid_len
);
150 rates
= sband
->n_bitrates
;
153 pos
= skb_put(skb
, 2 + rates
);
154 *pos
++ = WLAN_EID_SUPP_RATES
;
156 memcpy(pos
, supp_rates
, rates
);
158 if (sband
->band
== IEEE80211_BAND_2GHZ
) {
159 pos
= skb_put(skb
, 2 + 1);
160 *pos
++ = WLAN_EID_DS_PARAMS
;
162 *pos
++ = ieee80211_frequency_to_channel(chan
->center_freq
);
165 pos
= skb_put(skb
, 2 + 2);
166 *pos
++ = WLAN_EID_IBSS_PARAMS
;
168 /* FIX: set ATIM window based on scan results */
172 if (sband
->n_bitrates
> 8) {
173 rates
= sband
->n_bitrates
- 8;
174 pos
= skb_put(skb
, 2 + rates
);
175 *pos
++ = WLAN_EID_EXT_SUPP_RATES
;
177 memcpy(pos
, &supp_rates
[8], rates
);
181 memcpy(skb_put(skb
, ifibss
->ie_len
),
182 ifibss
->ie
, ifibss
->ie_len
);
184 /* add HT capability and information IEs */
185 if (channel_type
&& sband
->ht_cap
.ht_supported
) {
186 pos
= skb_put(skb
, 4 +
187 sizeof(struct ieee80211_ht_cap
) +
188 sizeof(struct ieee80211_ht_info
));
189 pos
= ieee80211_ie_build_ht_cap(pos
, &sband
->ht_cap
,
191 pos
= ieee80211_ie_build_ht_info(pos
,
197 if (local
->hw
.queues
>= 4) {
198 pos
= skb_put(skb
, 9);
199 *pos
++ = WLAN_EID_VENDOR_SPECIFIC
;
200 *pos
++ = 7; /* len */
201 *pos
++ = 0x00; /* Microsoft OUI 00:50:F2 */
204 *pos
++ = 2; /* WME */
205 *pos
++ = 0; /* WME info */
206 *pos
++ = 1; /* WME ver */
207 *pos
++ = 0; /* U-APSD no in use */
210 rcu_assign_pointer(ifibss
->presp
, skb
);
212 sdata
->vif
.bss_conf
.beacon_int
= beacon_int
;
213 sdata
->vif
.bss_conf
.basic_rates
= basic_rates
;
214 bss_change
= BSS_CHANGED_BEACON_INT
;
215 bss_change
|= ieee80211_reset_erp_info(sdata
);
216 bss_change
|= BSS_CHANGED_BSSID
;
217 bss_change
|= BSS_CHANGED_BEACON
;
218 bss_change
|= BSS_CHANGED_BEACON_ENABLED
;
219 bss_change
|= BSS_CHANGED_BASIC_RATES
;
220 bss_change
|= BSS_CHANGED_HT
;
221 bss_change
|= BSS_CHANGED_IBSS
;
222 sdata
->vif
.bss_conf
.ibss_joined
= true;
223 ieee80211_bss_info_change_notify(sdata
, bss_change
);
225 ieee80211_sta_def_wmm_params(sdata
, sband
->n_bitrates
, supp_rates
);
227 ifibss
->state
= IEEE80211_IBSS_MLME_JOINED
;
228 mod_timer(&ifibss
->timer
,
229 round_jiffies(jiffies
+ IEEE80211_IBSS_MERGE_INTERVAL
));
231 bss
= cfg80211_inform_bss_frame(local
->hw
.wiphy
, local
->hw
.conf
.channel
,
232 mgmt
, skb
->len
, 0, GFP_KERNEL
);
233 cfg80211_put_bss(bss
);
234 netif_carrier_on(sdata
->dev
);
235 cfg80211_ibss_joined(sdata
->dev
, ifibss
->bssid
, GFP_KERNEL
);
238 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data
*sdata
,
239 struct ieee80211_bss
*bss
)
241 struct cfg80211_bss
*cbss
=
242 container_of((void *)bss
, struct cfg80211_bss
, priv
);
243 struct ieee80211_supported_band
*sband
;
246 u16 beacon_int
= cbss
->beacon_interval
;
248 lockdep_assert_held(&sdata
->u
.ibss
.mtx
);
253 sband
= sdata
->local
->hw
.wiphy
->bands
[cbss
->channel
->band
];
257 for (i
= 0; i
< bss
->supp_rates_len
; i
++) {
258 int rate
= (bss
->supp_rates
[i
] & 0x7f) * 5;
259 bool is_basic
= !!(bss
->supp_rates
[i
] & 0x80);
261 for (j
= 0; j
< sband
->n_bitrates
; j
++) {
262 if (sband
->bitrates
[j
].bitrate
== rate
) {
264 basic_rates
|= BIT(j
);
270 __ieee80211_sta_join_ibss(sdata
, cbss
->bssid
,
278 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 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
287 wiphy_debug(sdata
->local
->hw
.wiphy
,
288 "Adding new IBSS station %pM (dev=%s)\n",
292 sta_info_move_state(sta
, IEEE80211_STA_AUTH
);
293 sta_info_move_state(sta
, IEEE80211_STA_ASSOC
);
294 sta_info_move_state(sta
, IEEE80211_STA_AUTHORIZED
);
296 rate_control_rate_init(sta
);
298 /* If it fails, maybe we raced another insertion? */
299 if (sta_info_insert_rcu(sta
))
300 return sta_info_get(sdata
, addr
);
304 static struct sta_info
*
305 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data
*sdata
,
306 const u8
*bssid
, const u8
*addr
,
310 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
311 struct ieee80211_local
*local
= sdata
->local
;
312 struct sta_info
*sta
;
313 int band
= local
->hw
.conf
.channel
->band
;
316 * XXX: Consider removing the least recently used entry and
317 * allow new one to be added.
319 if (local
->num_sta
>= IEEE80211_IBSS_MAX_STA_ENTRIES
) {
321 printk(KERN_DEBUG
"%s: No room for a new IBSS STA entry %pM\n",
327 if (ifibss
->state
== IEEE80211_IBSS_MLME_SEARCH
) {
332 if (compare_ether_addr(bssid
, sdata
->u
.ibss
.bssid
)) {
337 sta
= sta_info_alloc(sdata
, addr
, GFP_KERNEL
);
343 sta
->last_rx
= jiffies
;
345 /* make sure mandatory rates are always added */
346 sta
->sta
.supp_rates
[band
] = supp_rates
|
347 ieee80211_mandatory_rates(local
, band
);
349 return ieee80211_ibss_finish_sta(sta
);
352 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data
*sdata
,
353 struct ieee80211_mgmt
*mgmt
,
355 struct ieee80211_rx_status
*rx_status
,
356 struct ieee802_11_elems
*elems
,
359 struct ieee80211_local
*local
= sdata
->local
;
361 struct cfg80211_bss
*cbss
;
362 struct ieee80211_bss
*bss
;
363 struct sta_info
*sta
;
364 struct ieee80211_channel
*channel
;
365 u64 beacon_timestamp
, rx_timestamp
;
367 enum ieee80211_band band
= rx_status
->band
;
368 struct ieee80211_supported_band
*sband
= local
->hw
.wiphy
->bands
[band
];
369 bool rates_updated
= false;
371 if (elems
->ds_params
&& elems
->ds_params_len
== 1)
372 freq
= ieee80211_channel_to_frequency(elems
->ds_params
[0],
375 freq
= rx_status
->freq
;
377 channel
= ieee80211_get_channel(local
->hw
.wiphy
, freq
);
379 if (!channel
|| channel
->flags
& IEEE80211_CHAN_DISABLED
)
382 if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
&&
383 memcmp(mgmt
->bssid
, sdata
->u
.ibss
.bssid
, ETH_ALEN
) == 0) {
386 sta
= sta_info_get(sdata
, mgmt
->sa
);
388 if (elems
->supp_rates
) {
389 supp_rates
= ieee80211_sta_get_rates(local
, elems
,
394 prev_rates
= sta
->sta
.supp_rates
[band
];
395 /* make sure mandatory rates are always added */
396 sta
->sta
.supp_rates
[band
] = supp_rates
|
397 ieee80211_mandatory_rates(local
, band
);
399 if (sta
->sta
.supp_rates
[band
] != prev_rates
) {
400 #ifdef CONFIG_MAC80211_IBSS_DEBUG
402 "%s: updated supp_rates set "
403 "for %pM based on beacon"
404 "/probe_resp (0x%x -> 0x%x)\n",
405 sdata
->name
, sta
->sta
.addr
,
407 sta
->sta
.supp_rates
[band
]);
409 rates_updated
= true;
413 sta
= ieee80211_ibss_add_sta(sdata
, mgmt
->bssid
,
414 mgmt
->sa
, supp_rates
);
418 if (sta
&& elems
->wmm_info
)
419 set_sta_flag(sta
, WLAN_STA_WME
);
421 if (sta
&& elems
->ht_info_elem
&& elems
->ht_cap_elem
&&
422 sdata
->u
.ibss
.channel_type
!= NL80211_CHAN_NO_HT
) {
424 struct ieee80211_sta_ht_cap sta_ht_cap_new
;
425 enum nl80211_channel_type channel_type
=
426 ieee80211_ht_info_to_channel_type(
427 elems
->ht_info_elem
);
429 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata
, sband
,
434 * fall back to HT20 if we don't use or use
435 * the other extension channel
437 if ((channel_type
== NL80211_CHAN_HT40MINUS
||
438 channel_type
== NL80211_CHAN_HT40PLUS
) &&
439 channel_type
!= sdata
->u
.ibss
.channel_type
)
440 sta_ht_cap_new
.cap
&=
441 ~IEEE80211_HT_CAP_SUP_WIDTH_20_40
;
443 if (memcmp(&sta
->sta
.ht_cap
, &sta_ht_cap_new
,
444 sizeof(sta_ht_cap_new
))) {
445 memcpy(&sta
->sta
.ht_cap
, &sta_ht_cap_new
,
446 sizeof(sta_ht_cap_new
));
447 rates_updated
= true;
451 if (sta
&& rates_updated
)
452 rate_control_rate_init(sta
);
457 bss
= ieee80211_bss_info_update(local
, rx_status
, mgmt
, len
, elems
,
462 cbss
= container_of((void *)bss
, struct cfg80211_bss
, priv
);
464 /* was just updated in ieee80211_bss_info_update */
465 beacon_timestamp
= cbss
->tsf
;
467 /* check if we need to merge IBSS */
469 /* we use a fixed BSSID */
470 if (sdata
->u
.ibss
.fixed_bssid
)
474 if (!(cbss
->capability
& WLAN_CAPABILITY_IBSS
))
477 /* different channel */
478 if (cbss
->channel
!= local
->oper_channel
)
482 if (elems
->ssid_len
!= sdata
->u
.ibss
.ssid_len
||
483 memcmp(elems
->ssid
, sdata
->u
.ibss
.ssid
,
484 sdata
->u
.ibss
.ssid_len
))
488 if (memcmp(cbss
->bssid
, sdata
->u
.ibss
.bssid
, ETH_ALEN
) == 0)
491 if (rx_status
->flag
& RX_FLAG_MACTIME_MPDU
) {
493 * For correct IBSS merging we need mactime; since mactime is
494 * defined as the time the first data symbol of the frame hits
495 * the PHY, and the timestamp of the beacon is defined as "the
496 * time that the data symbol containing the first bit of the
497 * timestamp is transmitted to the PHY plus the transmitting
498 * STA's delays through its local PHY from the MAC-PHY
499 * interface to its interface with the WM" (802.11 11.1.2)
500 * - equals the time this bit arrives at the receiver - we have
501 * to take into account the offset between the two.
503 * E.g. at 1 MBit that means mactime is 192 usec earlier
504 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
508 if (rx_status
->flag
& RX_FLAG_HT
)
509 rate
= 65; /* TODO: HT rates */
511 rate
= local
->hw
.wiphy
->bands
[band
]->
512 bitrates
[rx_status
->rate_idx
].bitrate
;
514 rx_timestamp
= rx_status
->mactime
+ (24 * 8 * 10 / rate
);
517 * second best option: get current TSF
518 * (will return -1 if not supported)
520 rx_timestamp
= drv_get_tsf(local
, sdata
);
523 #ifdef CONFIG_MAC80211_IBSS_DEBUG
524 printk(KERN_DEBUG
"RX beacon SA=%pM BSSID="
525 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
526 mgmt
->sa
, mgmt
->bssid
,
527 (unsigned long long)rx_timestamp
,
528 (unsigned long long)beacon_timestamp
,
529 (unsigned long long)(rx_timestamp
- beacon_timestamp
),
533 if (beacon_timestamp
> rx_timestamp
) {
534 #ifdef CONFIG_MAC80211_IBSS_DEBUG
535 printk(KERN_DEBUG
"%s: beacon TSF higher than "
536 "local TSF - IBSS merge with BSSID %pM\n",
537 sdata
->name
, mgmt
->bssid
);
539 ieee80211_sta_join_ibss(sdata
, bss
);
540 supp_rates
= ieee80211_sta_get_rates(local
, elems
, band
);
541 ieee80211_ibss_add_sta(sdata
, mgmt
->bssid
, mgmt
->sa
,
547 ieee80211_rx_bss_put(local
, bss
);
550 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data
*sdata
,
551 const u8
*bssid
, const u8
*addr
,
554 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
555 struct ieee80211_local
*local
= sdata
->local
;
556 struct sta_info
*sta
;
557 int band
= local
->hw
.conf
.channel
->band
;
560 * XXX: Consider removing the least recently used entry and
561 * allow new one to be added.
563 if (local
->num_sta
>= IEEE80211_IBSS_MAX_STA_ENTRIES
) {
565 printk(KERN_DEBUG
"%s: No room for a new IBSS STA entry %pM\n",
570 if (ifibss
->state
== IEEE80211_IBSS_MLME_SEARCH
)
573 if (compare_ether_addr(bssid
, sdata
->u
.ibss
.bssid
))
576 sta
= sta_info_alloc(sdata
, addr
, GFP_ATOMIC
);
580 sta
->last_rx
= jiffies
;
582 /* make sure mandatory rates are always added */
583 sta
->sta
.supp_rates
[band
] = supp_rates
|
584 ieee80211_mandatory_rates(local
, band
);
586 spin_lock(&ifibss
->incomplete_lock
);
587 list_add(&sta
->list
, &ifibss
->incomplete_stations
);
588 spin_unlock(&ifibss
->incomplete_lock
);
589 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
592 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data
*sdata
)
594 struct ieee80211_local
*local
= sdata
->local
;
596 struct sta_info
*sta
;
598 lockdep_assert_held(&sdata
->u
.ibss
.mtx
);
602 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
603 if (sta
->sdata
== sdata
&&
604 time_after(sta
->last_rx
+ IEEE80211_IBSS_MERGE_INTERVAL
,
617 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
620 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data
*sdata
)
622 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
624 lockdep_assert_held(&ifibss
->mtx
);
626 mod_timer(&ifibss
->timer
,
627 round_jiffies(jiffies
+ IEEE80211_IBSS_MERGE_INTERVAL
));
629 ieee80211_sta_expire(sdata
, IEEE80211_IBSS_INACTIVITY_LIMIT
);
631 if (time_before(jiffies
, ifibss
->last_scan_completed
+
632 IEEE80211_IBSS_MERGE_INTERVAL
))
635 if (ieee80211_sta_active_ibss(sdata
))
638 if (ifibss
->fixed_channel
)
641 printk(KERN_DEBUG
"%s: No active IBSS STAs - trying to scan for other "
642 "IBSS networks with same SSID (merge)\n", sdata
->name
);
644 ieee80211_request_internal_scan(sdata
,
645 ifibss
->ssid
, ifibss
->ssid_len
, NULL
);
648 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data
*sdata
)
650 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
655 lockdep_assert_held(&ifibss
->mtx
);
657 if (ifibss
->fixed_bssid
) {
658 memcpy(bssid
, ifibss
->bssid
, ETH_ALEN
);
660 /* Generate random, not broadcast, locally administered BSSID. Mix in
661 * own MAC address to make sure that devices that do not have proper
662 * random number generator get different BSSID. */
663 get_random_bytes(bssid
, ETH_ALEN
);
664 for (i
= 0; i
< ETH_ALEN
; i
++)
665 bssid
[i
] ^= sdata
->vif
.addr
[i
];
670 printk(KERN_DEBUG
"%s: Creating new IBSS network, BSSID %pM\n",
673 capability
= WLAN_CAPABILITY_IBSS
;
676 capability
|= WLAN_CAPABILITY_PRIVACY
;
678 sdata
->drop_unencrypted
= 0;
680 __ieee80211_sta_join_ibss(sdata
, bssid
, sdata
->vif
.bss_conf
.beacon_int
,
681 ifibss
->channel
, ifibss
->basic_rates
,
686 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
689 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data
*sdata
)
691 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
692 struct ieee80211_local
*local
= sdata
->local
;
693 struct cfg80211_bss
*cbss
;
694 struct ieee80211_channel
*chan
= NULL
;
695 const u8
*bssid
= NULL
;
699 lockdep_assert_held(&ifibss
->mtx
);
701 active_ibss
= ieee80211_sta_active_ibss(sdata
);
702 #ifdef CONFIG_MAC80211_IBSS_DEBUG
703 printk(KERN_DEBUG
"%s: sta_find_ibss (active_ibss=%d)\n",
704 sdata
->name
, active_ibss
);
705 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
710 capability
= WLAN_CAPABILITY_IBSS
;
712 capability
|= WLAN_CAPABILITY_PRIVACY
;
713 if (ifibss
->fixed_bssid
)
714 bssid
= ifibss
->bssid
;
715 if (ifibss
->fixed_channel
)
716 chan
= ifibss
->channel
;
717 if (!is_zero_ether_addr(ifibss
->bssid
))
718 bssid
= ifibss
->bssid
;
719 cbss
= cfg80211_get_bss(local
->hw
.wiphy
, chan
, bssid
,
720 ifibss
->ssid
, ifibss
->ssid_len
,
721 WLAN_CAPABILITY_IBSS
| WLAN_CAPABILITY_PRIVACY
,
725 struct ieee80211_bss
*bss
;
727 bss
= (void *)cbss
->priv
;
728 #ifdef CONFIG_MAC80211_IBSS_DEBUG
729 printk(KERN_DEBUG
" sta_find_ibss: selected %pM current "
730 "%pM\n", cbss
->bssid
, ifibss
->bssid
);
731 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
733 printk(KERN_DEBUG
"%s: Selected IBSS BSSID %pM"
734 " based on configured SSID\n",
735 sdata
->name
, cbss
->bssid
);
737 ieee80211_sta_join_ibss(sdata
, bss
);
738 ieee80211_rx_bss_put(local
, bss
);
742 #ifdef CONFIG_MAC80211_IBSS_DEBUG
743 printk(KERN_DEBUG
" did not try to join ibss\n");
744 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
746 /* Selected IBSS not found in current scan results - try to scan */
747 if (time_after(jiffies
, ifibss
->last_scan_completed
+
748 IEEE80211_SCAN_INTERVAL
)) {
749 printk(KERN_DEBUG
"%s: Trigger new scan to find an IBSS to "
750 "join\n", sdata
->name
);
752 ieee80211_request_internal_scan(sdata
,
753 ifibss
->ssid
, ifibss
->ssid_len
,
754 ifibss
->fixed_channel
? ifibss
->channel
: NULL
);
756 int interval
= IEEE80211_SCAN_INTERVAL
;
758 if (time_after(jiffies
, ifibss
->ibss_join_req
+
759 IEEE80211_IBSS_JOIN_TIMEOUT
)) {
760 if (!(local
->oper_channel
->flags
& IEEE80211_CHAN_NO_IBSS
)) {
761 ieee80211_sta_create_ibss(sdata
);
764 printk(KERN_DEBUG
"%s: IBSS not allowed on"
765 " %d MHz\n", sdata
->name
,
766 local
->hw
.conf
.channel
->center_freq
);
768 /* No IBSS found - decrease scan interval and continue
770 interval
= IEEE80211_SCAN_INTERVAL_SLOW
;
773 mod_timer(&ifibss
->timer
,
774 round_jiffies(jiffies
+ interval
));
778 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data
*sdata
,
781 struct ieee80211_mgmt
*mgmt
= (void *)req
->data
;
782 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
783 struct ieee80211_local
*local
= sdata
->local
;
784 int tx_last_beacon
, len
= req
->len
;
786 struct ieee80211_mgmt
*resp
;
787 struct sk_buff
*presp
;
790 lockdep_assert_held(&ifibss
->mtx
);
792 presp
= rcu_dereference_protected(ifibss
->presp
,
793 lockdep_is_held(&ifibss
->mtx
));
795 if (ifibss
->state
!= IEEE80211_IBSS_MLME_JOINED
||
796 len
< 24 + 2 || !presp
)
799 tx_last_beacon
= drv_tx_last_beacon(local
);
801 #ifdef CONFIG_MAC80211_IBSS_DEBUG
802 printk(KERN_DEBUG
"%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
803 " (tx_last_beacon=%d)\n",
804 sdata
->name
, mgmt
->sa
, mgmt
->da
,
805 mgmt
->bssid
, tx_last_beacon
);
806 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
808 if (!tx_last_beacon
&& is_multicast_ether_addr(mgmt
->da
))
811 if (memcmp(mgmt
->bssid
, ifibss
->bssid
, ETH_ALEN
) != 0 &&
812 memcmp(mgmt
->bssid
, "\xff\xff\xff\xff\xff\xff", ETH_ALEN
) != 0)
815 end
= ((u8
*) mgmt
) + len
;
816 pos
= mgmt
->u
.probe_req
.variable
;
817 if (pos
[0] != WLAN_EID_SSID
||
818 pos
+ 2 + pos
[1] > end
) {
819 #ifdef CONFIG_MAC80211_IBSS_DEBUG
820 printk(KERN_DEBUG
"%s: Invalid SSID IE in ProbeReq "
822 sdata
->name
, mgmt
->sa
);
827 (pos
[1] != ifibss
->ssid_len
||
828 memcmp(pos
+ 2, ifibss
->ssid
, ifibss
->ssid_len
))) {
829 /* Ignore ProbeReq for foreign SSID */
833 /* Reply with ProbeResp */
834 skb
= skb_copy(presp
, GFP_KERNEL
);
838 resp
= (struct ieee80211_mgmt
*) skb
->data
;
839 memcpy(resp
->da
, mgmt
->sa
, ETH_ALEN
);
840 #ifdef CONFIG_MAC80211_IBSS_DEBUG
841 printk(KERN_DEBUG
"%s: Sending ProbeResp to %pM\n",
842 sdata
->name
, resp
->da
);
843 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
844 IEEE80211_SKB_CB(skb
)->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
845 ieee80211_tx_skb(sdata
, skb
);
848 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data
*sdata
,
849 struct ieee80211_mgmt
*mgmt
,
851 struct ieee80211_rx_status
*rx_status
)
854 struct ieee802_11_elems elems
;
856 if (memcmp(mgmt
->da
, sdata
->vif
.addr
, ETH_ALEN
))
857 return; /* ignore ProbeResp to foreign address */
859 baselen
= (u8
*) mgmt
->u
.probe_resp
.variable
- (u8
*) mgmt
;
863 ieee802_11_parse_elems(mgmt
->u
.probe_resp
.variable
, len
- baselen
,
866 ieee80211_rx_bss_info(sdata
, mgmt
, len
, rx_status
, &elems
, false);
869 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data
*sdata
,
870 struct ieee80211_mgmt
*mgmt
,
872 struct ieee80211_rx_status
*rx_status
)
875 struct ieee802_11_elems elems
;
877 /* Process beacon from the current BSS */
878 baselen
= (u8
*) mgmt
->u
.beacon
.variable
- (u8
*) mgmt
;
882 ieee802_11_parse_elems(mgmt
->u
.beacon
.variable
, len
- baselen
, &elems
);
884 ieee80211_rx_bss_info(sdata
, mgmt
, len
, rx_status
, &elems
, true);
887 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data
*sdata
,
890 struct ieee80211_rx_status
*rx_status
;
891 struct ieee80211_mgmt
*mgmt
;
894 rx_status
= IEEE80211_SKB_RXCB(skb
);
895 mgmt
= (struct ieee80211_mgmt
*) skb
->data
;
896 fc
= le16_to_cpu(mgmt
->frame_control
);
898 mutex_lock(&sdata
->u
.ibss
.mtx
);
900 if (!sdata
->u
.ibss
.ssid_len
)
901 goto mgmt_out
; /* not ready to merge yet */
903 switch (fc
& IEEE80211_FCTL_STYPE
) {
904 case IEEE80211_STYPE_PROBE_REQ
:
905 ieee80211_rx_mgmt_probe_req(sdata
, skb
);
907 case IEEE80211_STYPE_PROBE_RESP
:
908 ieee80211_rx_mgmt_probe_resp(sdata
, mgmt
, skb
->len
,
911 case IEEE80211_STYPE_BEACON
:
912 ieee80211_rx_mgmt_beacon(sdata
, mgmt
, skb
->len
,
915 case IEEE80211_STYPE_AUTH
:
916 ieee80211_rx_mgmt_auth_ibss(sdata
, mgmt
, skb
->len
);
921 mutex_unlock(&sdata
->u
.ibss
.mtx
);
924 void ieee80211_ibss_work(struct ieee80211_sub_if_data
*sdata
)
926 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
927 struct sta_info
*sta
;
929 mutex_lock(&ifibss
->mtx
);
932 * Work could be scheduled after scan or similar
933 * when we aren't even joined (or trying) with a
936 if (!ifibss
->ssid_len
)
939 spin_lock_bh(&ifibss
->incomplete_lock
);
940 while (!list_empty(&ifibss
->incomplete_stations
)) {
941 sta
= list_first_entry(&ifibss
->incomplete_stations
,
942 struct sta_info
, list
);
943 list_del(&sta
->list
);
944 spin_unlock_bh(&ifibss
->incomplete_lock
);
946 ieee80211_ibss_finish_sta(sta
);
948 spin_lock_bh(&ifibss
->incomplete_lock
);
950 spin_unlock_bh(&ifibss
->incomplete_lock
);
952 switch (ifibss
->state
) {
953 case IEEE80211_IBSS_MLME_SEARCH
:
954 ieee80211_sta_find_ibss(sdata
);
956 case IEEE80211_IBSS_MLME_JOINED
:
957 ieee80211_sta_merge_ibss(sdata
);
965 mutex_unlock(&ifibss
->mtx
);
968 static void ieee80211_ibss_timer(unsigned long data
)
970 struct ieee80211_sub_if_data
*sdata
=
971 (struct ieee80211_sub_if_data
*) data
;
972 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
973 struct ieee80211_local
*local
= sdata
->local
;
975 if (local
->quiescing
) {
976 ifibss
->timer_running
= true;
980 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
984 void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data
*sdata
)
986 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
988 if (del_timer_sync(&ifibss
->timer
))
989 ifibss
->timer_running
= true;
992 void ieee80211_ibss_restart(struct ieee80211_sub_if_data
*sdata
)
994 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
996 if (ifibss
->timer_running
) {
997 add_timer(&ifibss
->timer
);
998 ifibss
->timer_running
= false;
1003 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data
*sdata
)
1005 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
1007 setup_timer(&ifibss
->timer
, ieee80211_ibss_timer
,
1008 (unsigned long) sdata
);
1009 mutex_init(&ifibss
->mtx
);
1010 INIT_LIST_HEAD(&ifibss
->incomplete_stations
);
1011 spin_lock_init(&ifibss
->incomplete_lock
);
1014 /* scan finished notification */
1015 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local
*local
)
1017 struct ieee80211_sub_if_data
*sdata
;
1019 mutex_lock(&local
->iflist_mtx
);
1020 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
1021 if (!ieee80211_sdata_running(sdata
))
1023 if (sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
1025 sdata
->u
.ibss
.last_scan_completed
= jiffies
;
1026 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
1028 mutex_unlock(&local
->iflist_mtx
);
1031 int ieee80211_ibss_join(struct ieee80211_sub_if_data
*sdata
,
1032 struct cfg80211_ibss_params
*params
)
1034 struct sk_buff
*skb
;
1037 skb
= dev_alloc_skb(sdata
->local
->hw
.extra_tx_headroom
+
1038 sizeof(struct ieee80211_hdr_3addr
) +
1039 12 /* struct ieee80211_mgmt.u.beacon */ +
1040 2 + IEEE80211_MAX_SSID_LEN
/* max SSID */ +
1041 2 + 8 /* max Supported Rates */ +
1042 3 /* max DS params */ +
1043 4 /* IBSS params */ +
1044 2 + (IEEE80211_MAX_SUPP_RATES
- 8) +
1045 2 + sizeof(struct ieee80211_ht_cap
) +
1046 2 + sizeof(struct ieee80211_ht_info
) +
1051 mutex_lock(&sdata
->u
.ibss
.mtx
);
1053 if (params
->bssid
) {
1054 memcpy(sdata
->u
.ibss
.bssid
, params
->bssid
, ETH_ALEN
);
1055 sdata
->u
.ibss
.fixed_bssid
= true;
1057 sdata
->u
.ibss
.fixed_bssid
= false;
1059 sdata
->u
.ibss
.privacy
= params
->privacy
;
1060 sdata
->u
.ibss
.basic_rates
= params
->basic_rates
;
1061 memcpy(sdata
->vif
.bss_conf
.mcast_rate
, params
->mcast_rate
,
1062 sizeof(params
->mcast_rate
));
1064 sdata
->vif
.bss_conf
.beacon_int
= params
->beacon_interval
;
1066 sdata
->u
.ibss
.channel
= params
->channel
;
1067 sdata
->u
.ibss
.channel_type
= params
->channel_type
;
1068 sdata
->u
.ibss
.fixed_channel
= params
->channel_fixed
;
1070 /* fix ourselves to that channel now already */
1071 if (params
->channel_fixed
) {
1072 sdata
->local
->oper_channel
= params
->channel
;
1073 if (!ieee80211_set_channel_type(sdata
->local
, sdata
,
1074 params
->channel_type
)) {
1075 mutex_unlock(&sdata
->u
.ibss
.mtx
);
1082 sdata
->u
.ibss
.ie
= kmemdup(params
->ie
, params
->ie_len
,
1084 if (sdata
->u
.ibss
.ie
)
1085 sdata
->u
.ibss
.ie_len
= params
->ie_len
;
1088 sdata
->u
.ibss
.skb
= skb
;
1089 sdata
->u
.ibss
.state
= IEEE80211_IBSS_MLME_SEARCH
;
1090 sdata
->u
.ibss
.ibss_join_req
= jiffies
;
1092 memcpy(sdata
->u
.ibss
.ssid
, params
->ssid
, IEEE80211_MAX_SSID_LEN
);
1093 sdata
->u
.ibss
.ssid_len
= params
->ssid_len
;
1095 mutex_unlock(&sdata
->u
.ibss
.mtx
);
1097 mutex_lock(&sdata
->local
->mtx
);
1098 ieee80211_recalc_idle(sdata
->local
);
1099 mutex_unlock(&sdata
->local
->mtx
);
1102 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1103 * reserved, but an HT STA shall protect HT transmissions as though
1104 * the HT Protection field were set to non-HT mixed mode.
1106 * In an IBSS, the RIFS Mode field of the HT Operation element is
1107 * also reserved, but an HT STA shall operate as though this field
1111 sdata
->vif
.bss_conf
.ht_operation_mode
|=
1112 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1113 | IEEE80211_HT_PARAM_RIFS_MODE
;
1115 changed
|= BSS_CHANGED_HT
;
1116 ieee80211_bss_info_change_notify(sdata
, changed
);
1118 ieee80211_queue_work(&sdata
->local
->hw
, &sdata
->work
);
1123 int ieee80211_ibss_leave(struct ieee80211_sub_if_data
*sdata
)
1125 struct sk_buff
*skb
;
1126 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
1127 struct ieee80211_local
*local
= sdata
->local
;
1128 struct cfg80211_bss
*cbss
;
1131 struct sta_info
*sta
;
1133 mutex_lock(&sdata
->u
.ibss
.mtx
);
1135 sdata
->u
.ibss
.state
= IEEE80211_IBSS_MLME_SEARCH
;
1136 memset(sdata
->u
.ibss
.bssid
, 0, ETH_ALEN
);
1137 sdata
->u
.ibss
.ssid_len
= 0;
1139 active_ibss
= ieee80211_sta_active_ibss(sdata
);
1141 if (!active_ibss
&& !is_zero_ether_addr(ifibss
->bssid
)) {
1142 capability
= WLAN_CAPABILITY_IBSS
;
1144 if (ifibss
->privacy
)
1145 capability
|= WLAN_CAPABILITY_PRIVACY
;
1147 cbss
= cfg80211_get_bss(local
->hw
.wiphy
, ifibss
->channel
,
1148 ifibss
->bssid
, ifibss
->ssid
,
1149 ifibss
->ssid_len
, WLAN_CAPABILITY_IBSS
|
1150 WLAN_CAPABILITY_PRIVACY
,
1154 cfg80211_unlink_bss(local
->hw
.wiphy
, cbss
);
1155 cfg80211_put_bss(cbss
);
1159 sta_info_flush(sdata
->local
, sdata
);
1161 spin_lock_bh(&ifibss
->incomplete_lock
);
1162 while (!list_empty(&ifibss
->incomplete_stations
)) {
1163 sta
= list_first_entry(&ifibss
->incomplete_stations
,
1164 struct sta_info
, list
);
1165 list_del(&sta
->list
);
1166 spin_unlock_bh(&ifibss
->incomplete_lock
);
1168 sta_info_free(local
, sta
);
1169 spin_lock_bh(&ifibss
->incomplete_lock
);
1171 spin_unlock_bh(&ifibss
->incomplete_lock
);
1173 netif_carrier_off(sdata
->dev
);
1176 kfree(sdata
->u
.ibss
.ie
);
1177 skb
= rcu_dereference_protected(sdata
->u
.ibss
.presp
,
1178 lockdep_is_held(&sdata
->u
.ibss
.mtx
));
1179 RCU_INIT_POINTER(sdata
->u
.ibss
.presp
, NULL
);
1180 sdata
->vif
.bss_conf
.ibss_joined
= false;
1181 ieee80211_bss_info_change_notify(sdata
, BSS_CHANGED_BEACON_ENABLED
|
1186 skb_queue_purge(&sdata
->skb_queue
);
1188 del_timer_sync(&sdata
->u
.ibss
.timer
);
1190 mutex_unlock(&sdata
->u
.ibss
.mtx
);
1192 mutex_lock(&local
->mtx
);
1193 ieee80211_recalc_idle(sdata
->local
);
1194 mutex_unlock(&local
->mtx
);