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/if_ether.h>
17 #include <linux/skbuff.h>
18 #include <linux/if_arp.h>
19 #include <linux/etherdevice.h>
20 #include <linux/rtnetlink.h>
21 #include <net/mac80211.h>
22 #include <asm/unaligned.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_MERGE_DELAY 0x400000
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
, status_code
;
48 auth_alg
= le16_to_cpu(mgmt
->u
.auth
.auth_alg
);
49 auth_transaction
= le16_to_cpu(mgmt
->u
.auth
.auth_transaction
);
50 status_code
= le16_to_cpu(mgmt
->u
.auth
.status_code
);
53 * IEEE 802.11 standard does not require authentication in IBSS
54 * networks and most implementations do not seem to use it.
55 * However, try to reply to authentication attempts if someone
56 * has actually implemented this.
58 if (auth_alg
== WLAN_AUTH_OPEN
&& auth_transaction
== 1)
59 ieee80211_send_auth(sdata
, 2, WLAN_AUTH_OPEN
, NULL
, 0,
60 sdata
->u
.ibss
.bssid
, NULL
, 0, 0);
63 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data
*sdata
,
64 const u8
*bssid
, const int beacon_int
,
65 struct ieee80211_channel
*chan
,
66 const u32 basic_rates
,
67 const u16 capability
, u64 tsf
)
69 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
70 struct ieee80211_local
*local
= sdata
->local
;
73 struct ieee80211_mgmt
*mgmt
;
75 struct ieee80211_supported_band
*sband
;
77 u8 supp_rates
[IEEE80211_MAX_SUPP_RATES
];
79 /* Reset own TSF to allow time synchronization work. */
83 rcu_assign_pointer(ifibss
->presp
, NULL
);
85 skb
->data
= skb
->head
;
87 skb_reset_tail_pointer(skb
);
88 skb_reserve(skb
, sdata
->local
->hw
.extra_tx_headroom
);
90 if (memcmp(ifibss
->bssid
, bssid
, ETH_ALEN
))
91 sta_info_flush(sdata
->local
, sdata
);
93 memcpy(ifibss
->bssid
, bssid
, ETH_ALEN
);
95 sdata
->drop_unencrypted
= capability
& WLAN_CAPABILITY_PRIVACY
? 1 : 0;
97 local
->oper_channel
= chan
;
98 local
->oper_channel_type
= NL80211_CHAN_NO_HT
;
99 ieee80211_hw_config(local
, IEEE80211_CONF_CHANGE_CHANNEL
);
101 sband
= local
->hw
.wiphy
->bands
[chan
->band
];
103 /* build supported rates array */
105 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
106 int rate
= sband
->bitrates
[i
].bitrate
;
108 if (basic_rates
& BIT(i
))
110 *pos
++ = basic
| (u8
) (rate
/ 5);
113 /* Build IBSS probe response */
114 mgmt
= (void *) skb_put(skb
, 24 + sizeof(mgmt
->u
.beacon
));
115 memset(mgmt
, 0, 24 + sizeof(mgmt
->u
.beacon
));
116 mgmt
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
117 IEEE80211_STYPE_PROBE_RESP
);
118 memset(mgmt
->da
, 0xff, ETH_ALEN
);
119 memcpy(mgmt
->sa
, sdata
->dev
->dev_addr
, ETH_ALEN
);
120 memcpy(mgmt
->bssid
, ifibss
->bssid
, ETH_ALEN
);
121 mgmt
->u
.beacon
.beacon_int
= cpu_to_le16(beacon_int
);
122 mgmt
->u
.beacon
.timestamp
= cpu_to_le64(tsf
);
123 mgmt
->u
.beacon
.capab_info
= cpu_to_le16(capability
);
125 pos
= skb_put(skb
, 2 + ifibss
->ssid_len
);
126 *pos
++ = WLAN_EID_SSID
;
127 *pos
++ = ifibss
->ssid_len
;
128 memcpy(pos
, ifibss
->ssid
, ifibss
->ssid_len
);
130 rates
= sband
->n_bitrates
;
133 pos
= skb_put(skb
, 2 + rates
);
134 *pos
++ = WLAN_EID_SUPP_RATES
;
136 memcpy(pos
, supp_rates
, rates
);
138 if (sband
->band
== IEEE80211_BAND_2GHZ
) {
139 pos
= skb_put(skb
, 2 + 1);
140 *pos
++ = WLAN_EID_DS_PARAMS
;
142 *pos
++ = ieee80211_frequency_to_channel(chan
->center_freq
);
145 pos
= skb_put(skb
, 2 + 2);
146 *pos
++ = WLAN_EID_IBSS_PARAMS
;
148 /* FIX: set ATIM window based on scan results */
152 if (sband
->n_bitrates
> 8) {
153 rates
= sband
->n_bitrates
- 8;
154 pos
= skb_put(skb
, 2 + rates
);
155 *pos
++ = WLAN_EID_EXT_SUPP_RATES
;
157 memcpy(pos
, &supp_rates
[8], rates
);
161 memcpy(skb_put(skb
, ifibss
->ie_len
),
162 ifibss
->ie
, ifibss
->ie_len
);
164 rcu_assign_pointer(ifibss
->presp
, skb
);
166 sdata
->vif
.bss_conf
.beacon_int
= beacon_int
;
167 bss_change
= BSS_CHANGED_BEACON_INT
;
168 bss_change
|= ieee80211_reset_erp_info(sdata
);
169 bss_change
|= BSS_CHANGED_BSSID
;
170 bss_change
|= BSS_CHANGED_BEACON
;
171 bss_change
|= BSS_CHANGED_BEACON_ENABLED
;
172 ieee80211_bss_info_change_notify(sdata
, bss_change
);
174 ieee80211_sta_def_wmm_params(sdata
, sband
->n_bitrates
, supp_rates
);
176 ifibss
->state
= IEEE80211_IBSS_MLME_JOINED
;
177 mod_timer(&ifibss
->timer
,
178 round_jiffies(jiffies
+ IEEE80211_IBSS_MERGE_INTERVAL
));
180 cfg80211_inform_bss_frame(local
->hw
.wiphy
, local
->hw
.conf
.channel
,
181 mgmt
, skb
->len
, 0, GFP_KERNEL
);
182 cfg80211_ibss_joined(sdata
->dev
, ifibss
->bssid
, GFP_KERNEL
);
185 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data
*sdata
,
186 struct ieee80211_bss
*bss
)
188 struct ieee80211_supported_band
*sband
;
191 u16 beacon_int
= bss
->cbss
.beacon_interval
;
196 sband
= sdata
->local
->hw
.wiphy
->bands
[bss
->cbss
.channel
->band
];
200 for (i
= 0; i
< bss
->supp_rates_len
; i
++) {
201 int rate
= (bss
->supp_rates
[i
] & 0x7f) * 5;
202 bool is_basic
= !!(bss
->supp_rates
[i
] & 0x80);
204 for (j
= 0; j
< sband
->n_bitrates
; j
++) {
205 if (sband
->bitrates
[j
].bitrate
== rate
) {
207 basic_rates
|= BIT(j
);
213 __ieee80211_sta_join_ibss(sdata
, bss
->cbss
.bssid
,
217 bss
->cbss
.capability
,
221 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data
*sdata
,
222 struct ieee80211_mgmt
*mgmt
,
224 struct ieee80211_rx_status
*rx_status
,
225 struct ieee802_11_elems
*elems
,
228 struct ieee80211_local
*local
= sdata
->local
;
230 struct ieee80211_bss
*bss
;
231 struct sta_info
*sta
;
232 struct ieee80211_channel
*channel
;
233 u64 beacon_timestamp
, rx_timestamp
;
235 enum ieee80211_band band
= rx_status
->band
;
237 if (elems
->ds_params
&& elems
->ds_params_len
== 1)
238 freq
= ieee80211_channel_to_frequency(elems
->ds_params
[0]);
240 freq
= rx_status
->freq
;
242 channel
= ieee80211_get_channel(local
->hw
.wiphy
, freq
);
244 if (!channel
|| channel
->flags
& IEEE80211_CHAN_DISABLED
)
247 if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
&& elems
->supp_rates
&&
248 memcmp(mgmt
->bssid
, sdata
->u
.ibss
.bssid
, ETH_ALEN
) == 0) {
249 supp_rates
= ieee80211_sta_get_rates(local
, elems
, band
);
253 sta
= sta_info_get(local
, mgmt
->sa
);
257 prev_rates
= sta
->sta
.supp_rates
[band
];
258 /* make sure mandatory rates are always added */
259 sta
->sta
.supp_rates
[band
] = supp_rates
|
260 ieee80211_mandatory_rates(local
, band
);
262 #ifdef CONFIG_MAC80211_IBSS_DEBUG
263 if (sta
->sta
.supp_rates
[band
] != prev_rates
)
264 printk(KERN_DEBUG
"%s: updated supp_rates set "
265 "for %pM based on beacon info (0x%llx | "
266 "0x%llx -> 0x%llx)\n",
269 (unsigned long long) prev_rates
,
270 (unsigned long long) supp_rates
,
271 (unsigned long long) sta
->sta
.supp_rates
[band
]);
274 ieee80211_ibss_add_sta(sdata
, mgmt
->bssid
, mgmt
->sa
, supp_rates
);
279 bss
= ieee80211_bss_info_update(local
, rx_status
, mgmt
, len
, elems
,
284 /* was just updated in ieee80211_bss_info_update */
285 beacon_timestamp
= bss
->cbss
.tsf
;
287 /* check if we need to merge IBSS */
289 /* merge only on beacons (???) */
293 /* we use a fixed BSSID */
294 if (sdata
->u
.ibss
.bssid
)
298 if (!(bss
->cbss
.capability
& WLAN_CAPABILITY_IBSS
))
301 /* different channel */
302 if (bss
->cbss
.channel
!= local
->oper_channel
)
306 if (elems
->ssid_len
!= sdata
->u
.ibss
.ssid_len
||
307 memcmp(elems
->ssid
, sdata
->u
.ibss
.ssid
,
308 sdata
->u
.ibss
.ssid_len
))
312 if (memcmp(bss
->cbss
.bssid
, sdata
->u
.ibss
.bssid
, ETH_ALEN
) == 0)
315 if (rx_status
->flag
& RX_FLAG_TSFT
) {
317 * For correct IBSS merging we need mactime; since mactime is
318 * defined as the time the first data symbol of the frame hits
319 * the PHY, and the timestamp of the beacon is defined as "the
320 * time that the data symbol containing the first bit of the
321 * timestamp is transmitted to the PHY plus the transmitting
322 * STA's delays through its local PHY from the MAC-PHY
323 * interface to its interface with the WM" (802.11 11.1.2)
324 * - equals the time this bit arrives at the receiver - we have
325 * to take into account the offset between the two.
327 * E.g. at 1 MBit that means mactime is 192 usec earlier
328 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
332 if (rx_status
->flag
& RX_FLAG_HT
)
333 rate
= 65; /* TODO: HT rates */
335 rate
= local
->hw
.wiphy
->bands
[band
]->
336 bitrates
[rx_status
->rate_idx
].bitrate
;
338 rx_timestamp
= rx_status
->mactime
+ (24 * 8 * 10 / rate
);
341 * second best option: get current TSF
342 * (will return -1 if not supported)
344 rx_timestamp
= drv_get_tsf(local
);
347 #ifdef CONFIG_MAC80211_IBSS_DEBUG
348 printk(KERN_DEBUG
"RX beacon SA=%pM BSSID="
349 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
350 mgmt
->sa
, mgmt
->bssid
,
351 (unsigned long long)rx_timestamp
,
352 (unsigned long long)beacon_timestamp
,
353 (unsigned long long)(rx_timestamp
- beacon_timestamp
),
357 /* give slow hardware some time to do the TSF sync */
358 if (rx_timestamp
< IEEE80211_IBSS_MERGE_DELAY
)
361 if (beacon_timestamp
> rx_timestamp
) {
362 #ifdef CONFIG_MAC80211_IBSS_DEBUG
363 printk(KERN_DEBUG
"%s: beacon TSF higher than "
364 "local TSF - IBSS merge with BSSID %pM\n",
365 sdata
->dev
->name
, mgmt
->bssid
);
367 ieee80211_sta_join_ibss(sdata
, bss
);
368 ieee80211_ibss_add_sta(sdata
, mgmt
->bssid
, mgmt
->sa
, supp_rates
);
372 ieee80211_rx_bss_put(local
, bss
);
376 * Add a new IBSS station, will also be called by the RX code when,
377 * in IBSS mode, receiving a frame from a yet-unknown station, hence
378 * must be callable in atomic context.
380 struct sta_info
*ieee80211_ibss_add_sta(struct ieee80211_sub_if_data
*sdata
,
381 u8
*bssid
,u8
*addr
, u32 supp_rates
)
383 struct ieee80211_local
*local
= sdata
->local
;
384 struct sta_info
*sta
;
385 int band
= local
->hw
.conf
.channel
->band
;
388 * XXX: Consider removing the least recently used entry and
389 * allow new one to be added.
391 if (local
->num_sta
>= IEEE80211_IBSS_MAX_STA_ENTRIES
) {
393 printk(KERN_DEBUG
"%s: No room for a new IBSS STA entry %pM\n",
394 sdata
->dev
->name
, addr
);
398 if (compare_ether_addr(bssid
, sdata
->u
.ibss
.bssid
))
401 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
402 printk(KERN_DEBUG
"%s: Adding new IBSS station %pM (dev=%s)\n",
403 wiphy_name(local
->hw
.wiphy
), addr
, sdata
->dev
->name
);
406 sta
= sta_info_alloc(sdata
, addr
, GFP_ATOMIC
);
410 set_sta_flags(sta
, WLAN_STA_AUTHORIZED
);
412 /* make sure mandatory rates are always added */
413 sta
->sta
.supp_rates
[band
] = supp_rates
|
414 ieee80211_mandatory_rates(local
, band
);
416 rate_control_rate_init(sta
);
418 if (sta_info_insert(sta
))
424 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data
*sdata
)
426 struct ieee80211_local
*local
= sdata
->local
;
428 struct sta_info
*sta
;
432 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
433 if (sta
->sdata
== sdata
&&
434 time_after(sta
->last_rx
+ IEEE80211_IBSS_MERGE_INTERVAL
,
447 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data
*sdata
)
449 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
451 mod_timer(&ifibss
->timer
,
452 round_jiffies(jiffies
+ IEEE80211_IBSS_MERGE_INTERVAL
));
454 ieee80211_sta_expire(sdata
, IEEE80211_IBSS_INACTIVITY_LIMIT
);
456 if (ieee80211_sta_active_ibss(sdata
))
459 if (ifibss
->fixed_channel
)
462 printk(KERN_DEBUG
"%s: No active IBSS STAs - trying to scan for other "
463 "IBSS networks with same SSID (merge)\n", sdata
->dev
->name
);
465 ieee80211_request_internal_scan(sdata
, ifibss
->ssid
, ifibss
->ssid_len
);
468 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data
*sdata
)
470 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
471 struct ieee80211_local
*local
= sdata
->local
;
472 struct ieee80211_supported_band
*sband
;
477 if (ifibss
->fixed_bssid
) {
478 memcpy(bssid
, ifibss
->bssid
, ETH_ALEN
);
480 /* Generate random, not broadcast, locally administered BSSID. Mix in
481 * own MAC address to make sure that devices that do not have proper
482 * random number generator get different BSSID. */
483 get_random_bytes(bssid
, ETH_ALEN
);
484 for (i
= 0; i
< ETH_ALEN
; i
++)
485 bssid
[i
] ^= sdata
->dev
->dev_addr
[i
];
490 printk(KERN_DEBUG
"%s: Creating new IBSS network, BSSID %pM\n",
491 sdata
->dev
->name
, bssid
);
493 sband
= local
->hw
.wiphy
->bands
[ifibss
->channel
->band
];
495 capability
= WLAN_CAPABILITY_IBSS
;
498 capability
|= WLAN_CAPABILITY_PRIVACY
;
500 sdata
->drop_unencrypted
= 0;
502 __ieee80211_sta_join_ibss(sdata
, bssid
, sdata
->vif
.bss_conf
.beacon_int
,
503 ifibss
->channel
, 3, /* first two are basic */
507 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data
*sdata
)
509 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
510 struct ieee80211_local
*local
= sdata
->local
;
511 struct ieee80211_bss
*bss
;
512 struct ieee80211_channel
*chan
= NULL
;
513 const u8
*bssid
= NULL
;
517 active_ibss
= ieee80211_sta_active_ibss(sdata
);
518 #ifdef CONFIG_MAC80211_IBSS_DEBUG
519 printk(KERN_DEBUG
"%s: sta_find_ibss (active_ibss=%d)\n",
520 sdata
->dev
->name
, active_ibss
);
521 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
526 capability
= WLAN_CAPABILITY_IBSS
;
528 capability
|= WLAN_CAPABILITY_PRIVACY
;
529 if (ifibss
->fixed_bssid
)
530 bssid
= ifibss
->bssid
;
531 if (ifibss
->fixed_channel
)
532 chan
= ifibss
->channel
;
533 if (!is_zero_ether_addr(ifibss
->bssid
))
534 bssid
= ifibss
->bssid
;
535 bss
= (void *)cfg80211_get_bss(local
->hw
.wiphy
, chan
, bssid
,
536 ifibss
->ssid
, ifibss
->ssid_len
,
537 WLAN_CAPABILITY_IBSS
|
538 WLAN_CAPABILITY_PRIVACY
,
542 #ifdef CONFIG_MAC80211_IBSS_DEBUG
543 printk(KERN_DEBUG
" sta_find_ibss: selected %pM current "
544 "%pM\n", bss
->cbss
.bssid
, ifibss
->bssid
);
545 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
547 printk(KERN_DEBUG
"%s: Selected IBSS BSSID %pM"
548 " based on configured SSID\n",
549 sdata
->dev
->name
, bss
->cbss
.bssid
);
551 ieee80211_sta_join_ibss(sdata
, bss
);
552 ieee80211_rx_bss_put(local
, bss
);
556 #ifdef CONFIG_MAC80211_IBSS_DEBUG
557 printk(KERN_DEBUG
" did not try to join ibss\n");
558 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
560 /* Selected IBSS not found in current scan results - try to scan */
561 if (ifibss
->state
== IEEE80211_IBSS_MLME_JOINED
&&
562 !ieee80211_sta_active_ibss(sdata
)) {
563 mod_timer(&ifibss
->timer
,
564 round_jiffies(jiffies
+ IEEE80211_IBSS_MERGE_INTERVAL
));
565 } else if (time_after(jiffies
, ifibss
->last_scan_completed
+
566 IEEE80211_SCAN_INTERVAL
)) {
567 printk(KERN_DEBUG
"%s: Trigger new scan to find an IBSS to "
568 "join\n", sdata
->dev
->name
);
570 ieee80211_request_internal_scan(sdata
, ifibss
->ssid
,
572 } else if (ifibss
->state
!= IEEE80211_IBSS_MLME_JOINED
) {
573 int interval
= IEEE80211_SCAN_INTERVAL
;
575 if (time_after(jiffies
, ifibss
->ibss_join_req
+
576 IEEE80211_IBSS_JOIN_TIMEOUT
)) {
577 if (!(local
->oper_channel
->flags
& IEEE80211_CHAN_NO_IBSS
)) {
578 ieee80211_sta_create_ibss(sdata
);
581 printk(KERN_DEBUG
"%s: IBSS not allowed on"
582 " %d MHz\n", sdata
->dev
->name
,
583 local
->hw
.conf
.channel
->center_freq
);
585 /* No IBSS found - decrease scan interval and continue
587 interval
= IEEE80211_SCAN_INTERVAL_SLOW
;
590 ifibss
->state
= IEEE80211_IBSS_MLME_SEARCH
;
591 mod_timer(&ifibss
->timer
,
592 round_jiffies(jiffies
+ interval
));
596 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data
*sdata
,
597 struct ieee80211_mgmt
*mgmt
,
600 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
601 struct ieee80211_local
*local
= sdata
->local
;
604 struct ieee80211_mgmt
*resp
;
607 if (ifibss
->state
!= IEEE80211_IBSS_MLME_JOINED
||
608 len
< 24 + 2 || !ifibss
->presp
)
611 tx_last_beacon
= drv_tx_last_beacon(local
);
613 #ifdef CONFIG_MAC80211_IBSS_DEBUG
614 printk(KERN_DEBUG
"%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
615 " (tx_last_beacon=%d)\n",
616 sdata
->dev
->name
, mgmt
->sa
, mgmt
->da
,
617 mgmt
->bssid
, tx_last_beacon
);
618 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
623 if (memcmp(mgmt
->bssid
, ifibss
->bssid
, ETH_ALEN
) != 0 &&
624 memcmp(mgmt
->bssid
, "\xff\xff\xff\xff\xff\xff", ETH_ALEN
) != 0)
627 end
= ((u8
*) mgmt
) + len
;
628 pos
= mgmt
->u
.probe_req
.variable
;
629 if (pos
[0] != WLAN_EID_SSID
||
630 pos
+ 2 + pos
[1] > end
) {
631 #ifdef CONFIG_MAC80211_IBSS_DEBUG
632 printk(KERN_DEBUG
"%s: Invalid SSID IE in ProbeReq "
634 sdata
->dev
->name
, mgmt
->sa
);
639 (pos
[1] != ifibss
->ssid_len
||
640 !memcmp(pos
+ 2, ifibss
->ssid
, ifibss
->ssid_len
))) {
641 /* Ignore ProbeReq for foreign SSID */
645 /* Reply with ProbeResp */
646 skb
= skb_copy(ifibss
->presp
, GFP_KERNEL
);
650 resp
= (struct ieee80211_mgmt
*) skb
->data
;
651 memcpy(resp
->da
, mgmt
->sa
, ETH_ALEN
);
652 #ifdef CONFIG_MAC80211_IBSS_DEBUG
653 printk(KERN_DEBUG
"%s: Sending ProbeResp to %pM\n",
654 sdata
->dev
->name
, resp
->da
);
655 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
656 ieee80211_tx_skb(sdata
, skb
, 0);
659 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data
*sdata
,
660 struct ieee80211_mgmt
*mgmt
,
662 struct ieee80211_rx_status
*rx_status
)
665 struct ieee802_11_elems elems
;
667 if (memcmp(mgmt
->da
, sdata
->dev
->dev_addr
, ETH_ALEN
))
668 return; /* ignore ProbeResp to foreign address */
670 baselen
= (u8
*) mgmt
->u
.probe_resp
.variable
- (u8
*) mgmt
;
674 ieee802_11_parse_elems(mgmt
->u
.probe_resp
.variable
, len
- baselen
,
677 ieee80211_rx_bss_info(sdata
, mgmt
, len
, rx_status
, &elems
, false);
680 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data
*sdata
,
681 struct ieee80211_mgmt
*mgmt
,
683 struct ieee80211_rx_status
*rx_status
)
686 struct ieee802_11_elems elems
;
688 /* Process beacon from the current BSS */
689 baselen
= (u8
*) mgmt
->u
.beacon
.variable
- (u8
*) mgmt
;
693 ieee802_11_parse_elems(mgmt
->u
.beacon
.variable
, len
- baselen
, &elems
);
695 ieee80211_rx_bss_info(sdata
, mgmt
, len
, rx_status
, &elems
, true);
698 static void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data
*sdata
,
701 struct ieee80211_rx_status
*rx_status
;
702 struct ieee80211_mgmt
*mgmt
;
705 rx_status
= IEEE80211_SKB_RXCB(skb
);
706 mgmt
= (struct ieee80211_mgmt
*) skb
->data
;
707 fc
= le16_to_cpu(mgmt
->frame_control
);
709 switch (fc
& IEEE80211_FCTL_STYPE
) {
710 case IEEE80211_STYPE_PROBE_REQ
:
711 ieee80211_rx_mgmt_probe_req(sdata
, mgmt
, skb
->len
);
713 case IEEE80211_STYPE_PROBE_RESP
:
714 ieee80211_rx_mgmt_probe_resp(sdata
, mgmt
, skb
->len
,
717 case IEEE80211_STYPE_BEACON
:
718 ieee80211_rx_mgmt_beacon(sdata
, mgmt
, skb
->len
,
721 case IEEE80211_STYPE_AUTH
:
722 ieee80211_rx_mgmt_auth_ibss(sdata
, mgmt
, skb
->len
);
729 static void ieee80211_ibss_work(struct work_struct
*work
)
731 struct ieee80211_sub_if_data
*sdata
=
732 container_of(work
, struct ieee80211_sub_if_data
, u
.ibss
.work
);
733 struct ieee80211_local
*local
= sdata
->local
;
734 struct ieee80211_if_ibss
*ifibss
;
737 if (WARN_ON(local
->suspended
))
740 if (!netif_running(sdata
->dev
))
746 if (WARN_ON(sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
))
748 ifibss
= &sdata
->u
.ibss
;
750 while ((skb
= skb_dequeue(&ifibss
->skb_queue
)))
751 ieee80211_ibss_rx_queued_mgmt(sdata
, skb
);
753 if (!test_and_clear_bit(IEEE80211_IBSS_REQ_RUN
, &ifibss
->request
))
756 switch (ifibss
->state
) {
757 case IEEE80211_IBSS_MLME_SEARCH
:
758 ieee80211_sta_find_ibss(sdata
);
760 case IEEE80211_IBSS_MLME_JOINED
:
761 ieee80211_sta_merge_ibss(sdata
);
769 static void ieee80211_ibss_timer(unsigned long data
)
771 struct ieee80211_sub_if_data
*sdata
=
772 (struct ieee80211_sub_if_data
*) data
;
773 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
774 struct ieee80211_local
*local
= sdata
->local
;
776 if (local
->quiescing
) {
777 ifibss
->timer_running
= true;
781 set_bit(IEEE80211_IBSS_REQ_RUN
, &ifibss
->request
);
782 ieee80211_queue_work(&local
->hw
, &ifibss
->work
);
786 void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data
*sdata
)
788 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
790 cancel_work_sync(&ifibss
->work
);
791 if (del_timer_sync(&ifibss
->timer
))
792 ifibss
->timer_running
= true;
795 void ieee80211_ibss_restart(struct ieee80211_sub_if_data
*sdata
)
797 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
799 if (ifibss
->timer_running
) {
800 add_timer(&ifibss
->timer
);
801 ifibss
->timer_running
= false;
806 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data
*sdata
)
808 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
810 INIT_WORK(&ifibss
->work
, ieee80211_ibss_work
);
811 setup_timer(&ifibss
->timer
, ieee80211_ibss_timer
,
812 (unsigned long) sdata
);
813 skb_queue_head_init(&ifibss
->skb_queue
);
816 /* scan finished notification */
817 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local
*local
)
819 struct ieee80211_sub_if_data
*sdata
;
821 mutex_lock(&local
->iflist_mtx
);
822 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
823 if (!netif_running(sdata
->dev
))
825 if (sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
827 if (!sdata
->u
.ibss
.ssid_len
)
829 sdata
->u
.ibss
.last_scan_completed
= jiffies
;
830 mod_timer(&sdata
->u
.ibss
.timer
, 0);
832 mutex_unlock(&local
->iflist_mtx
);
836 ieee80211_ibss_rx_mgmt(struct ieee80211_sub_if_data
*sdata
, struct sk_buff
*skb
)
838 struct ieee80211_local
*local
= sdata
->local
;
839 struct ieee80211_mgmt
*mgmt
;
843 return RX_DROP_MONITOR
;
845 mgmt
= (struct ieee80211_mgmt
*) skb
->data
;
846 fc
= le16_to_cpu(mgmt
->frame_control
);
848 switch (fc
& IEEE80211_FCTL_STYPE
) {
849 case IEEE80211_STYPE_PROBE_RESP
:
850 case IEEE80211_STYPE_BEACON
:
851 case IEEE80211_STYPE_PROBE_REQ
:
852 case IEEE80211_STYPE_AUTH
:
853 skb_queue_tail(&sdata
->u
.ibss
.skb_queue
, skb
);
854 ieee80211_queue_work(&local
->hw
, &sdata
->u
.ibss
.work
);
858 return RX_DROP_MONITOR
;
861 int ieee80211_ibss_join(struct ieee80211_sub_if_data
*sdata
,
862 struct cfg80211_ibss_params
*params
)
867 memcpy(sdata
->u
.ibss
.bssid
, params
->bssid
, ETH_ALEN
);
868 sdata
->u
.ibss
.fixed_bssid
= true;
870 sdata
->u
.ibss
.fixed_bssid
= false;
872 sdata
->u
.ibss
.privacy
= params
->privacy
;
874 sdata
->vif
.bss_conf
.beacon_int
= params
->beacon_interval
;
876 sdata
->u
.ibss
.channel
= params
->channel
;
877 sdata
->u
.ibss
.fixed_channel
= params
->channel_fixed
;
880 sdata
->u
.ibss
.ie
= kmemdup(params
->ie
, params
->ie_len
,
882 if (sdata
->u
.ibss
.ie
)
883 sdata
->u
.ibss
.ie_len
= params
->ie_len
;
886 skb
= dev_alloc_skb(sdata
->local
->hw
.extra_tx_headroom
+
890 4 /* IBSS params */ +
895 sdata
->u
.ibss
.skb
= skb
;
896 sdata
->u
.ibss
.state
= IEEE80211_IBSS_MLME_SEARCH
;
897 sdata
->u
.ibss
.ibss_join_req
= jiffies
;
899 memcpy(sdata
->u
.ibss
.ssid
, params
->ssid
, IEEE80211_MAX_SSID_LEN
);
902 * The ssid_len setting below is used to see whether
903 * we are active, and we need all other settings
904 * before that may get visible.
908 sdata
->u
.ibss
.ssid_len
= params
->ssid_len
;
910 ieee80211_recalc_idle(sdata
->local
);
912 set_bit(IEEE80211_IBSS_REQ_RUN
, &sdata
->u
.ibss
.request
);
913 ieee80211_queue_work(&sdata
->local
->hw
, &sdata
->u
.ibss
.work
);
918 int ieee80211_ibss_leave(struct ieee80211_sub_if_data
*sdata
)
922 del_timer_sync(&sdata
->u
.ibss
.timer
);
923 clear_bit(IEEE80211_IBSS_REQ_RUN
, &sdata
->u
.ibss
.request
);
924 cancel_work_sync(&sdata
->u
.ibss
.work
);
925 clear_bit(IEEE80211_IBSS_REQ_RUN
, &sdata
->u
.ibss
.request
);
927 sta_info_flush(sdata
->local
, sdata
);
930 kfree(sdata
->u
.ibss
.ie
);
931 skb
= sdata
->u
.ibss
.presp
;
932 rcu_assign_pointer(sdata
->u
.ibss
.presp
, NULL
);
933 ieee80211_bss_info_change_notify(sdata
, BSS_CHANGED_BEACON_ENABLED
);
937 skb_queue_purge(&sdata
->u
.ibss
.skb_queue
);
938 memset(sdata
->u
.ibss
.bssid
, 0, ETH_ALEN
);
939 sdata
->u
.ibss
.ssid_len
= 0;
941 ieee80211_recalc_idle(sdata
->local
);