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
;
76 struct cfg80211_bss
*bss
;
78 u8 supp_rates
[IEEE80211_MAX_SUPP_RATES
];
80 /* Reset own TSF to allow time synchronization work. */
84 rcu_assign_pointer(ifibss
->presp
, NULL
);
86 skb
->data
= skb
->head
;
88 skb_reset_tail_pointer(skb
);
89 skb_reserve(skb
, sdata
->local
->hw
.extra_tx_headroom
);
91 if (memcmp(ifibss
->bssid
, bssid
, ETH_ALEN
))
92 sta_info_flush(sdata
->local
, sdata
);
94 memcpy(ifibss
->bssid
, bssid
, ETH_ALEN
);
96 sdata
->drop_unencrypted
= capability
& WLAN_CAPABILITY_PRIVACY
? 1 : 0;
98 local
->oper_channel
= chan
;
99 local
->oper_channel_type
= NL80211_CHAN_NO_HT
;
100 ieee80211_hw_config(local
, IEEE80211_CONF_CHANGE_CHANNEL
);
102 sband
= local
->hw
.wiphy
->bands
[chan
->band
];
104 /* build supported rates array */
106 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
107 int rate
= sband
->bitrates
[i
].bitrate
;
109 if (basic_rates
& BIT(i
))
111 *pos
++ = basic
| (u8
) (rate
/ 5);
114 /* Build IBSS probe response */
115 mgmt
= (void *) skb_put(skb
, 24 + sizeof(mgmt
->u
.beacon
));
116 memset(mgmt
, 0, 24 + sizeof(mgmt
->u
.beacon
));
117 mgmt
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
118 IEEE80211_STYPE_PROBE_RESP
);
119 memset(mgmt
->da
, 0xff, ETH_ALEN
);
120 memcpy(mgmt
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
121 memcpy(mgmt
->bssid
, ifibss
->bssid
, ETH_ALEN
);
122 mgmt
->u
.beacon
.beacon_int
= cpu_to_le16(beacon_int
);
123 mgmt
->u
.beacon
.timestamp
= cpu_to_le64(tsf
);
124 mgmt
->u
.beacon
.capab_info
= cpu_to_le16(capability
);
126 pos
= skb_put(skb
, 2 + ifibss
->ssid_len
);
127 *pos
++ = WLAN_EID_SSID
;
128 *pos
++ = ifibss
->ssid_len
;
129 memcpy(pos
, ifibss
->ssid
, ifibss
->ssid_len
);
131 rates
= sband
->n_bitrates
;
134 pos
= skb_put(skb
, 2 + rates
);
135 *pos
++ = WLAN_EID_SUPP_RATES
;
137 memcpy(pos
, supp_rates
, rates
);
139 if (sband
->band
== IEEE80211_BAND_2GHZ
) {
140 pos
= skb_put(skb
, 2 + 1);
141 *pos
++ = WLAN_EID_DS_PARAMS
;
143 *pos
++ = ieee80211_frequency_to_channel(chan
->center_freq
);
146 pos
= skb_put(skb
, 2 + 2);
147 *pos
++ = WLAN_EID_IBSS_PARAMS
;
149 /* FIX: set ATIM window based on scan results */
153 if (sband
->n_bitrates
> 8) {
154 rates
= sband
->n_bitrates
- 8;
155 pos
= skb_put(skb
, 2 + rates
);
156 *pos
++ = WLAN_EID_EXT_SUPP_RATES
;
158 memcpy(pos
, &supp_rates
[8], rates
);
162 memcpy(skb_put(skb
, ifibss
->ie_len
),
163 ifibss
->ie
, ifibss
->ie_len
);
165 rcu_assign_pointer(ifibss
->presp
, skb
);
167 sdata
->vif
.bss_conf
.beacon_int
= beacon_int
;
168 bss_change
= BSS_CHANGED_BEACON_INT
;
169 bss_change
|= ieee80211_reset_erp_info(sdata
);
170 bss_change
|= BSS_CHANGED_BSSID
;
171 bss_change
|= BSS_CHANGED_BEACON
;
172 bss_change
|= BSS_CHANGED_BEACON_ENABLED
;
173 ieee80211_bss_info_change_notify(sdata
, bss_change
);
175 ieee80211_sta_def_wmm_params(sdata
, sband
->n_bitrates
, supp_rates
);
177 ifibss
->state
= IEEE80211_IBSS_MLME_JOINED
;
178 mod_timer(&ifibss
->timer
,
179 round_jiffies(jiffies
+ IEEE80211_IBSS_MERGE_INTERVAL
));
181 bss
= cfg80211_inform_bss_frame(local
->hw
.wiphy
, local
->hw
.conf
.channel
,
182 mgmt
, skb
->len
, 0, GFP_KERNEL
);
183 cfg80211_put_bss(bss
);
184 cfg80211_ibss_joined(sdata
->dev
, ifibss
->bssid
, GFP_KERNEL
);
187 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data
*sdata
,
188 struct ieee80211_bss
*bss
)
190 struct cfg80211_bss
*cbss
=
191 container_of((void *)bss
, struct cfg80211_bss
, priv
);
192 struct ieee80211_supported_band
*sband
;
195 u16 beacon_int
= cbss
->beacon_interval
;
200 sband
= sdata
->local
->hw
.wiphy
->bands
[cbss
->channel
->band
];
204 for (i
= 0; i
< bss
->supp_rates_len
; i
++) {
205 int rate
= (bss
->supp_rates
[i
] & 0x7f) * 5;
206 bool is_basic
= !!(bss
->supp_rates
[i
] & 0x80);
208 for (j
= 0; j
< sband
->n_bitrates
; j
++) {
209 if (sband
->bitrates
[j
].bitrate
== rate
) {
211 basic_rates
|= BIT(j
);
217 __ieee80211_sta_join_ibss(sdata
, cbss
->bssid
,
225 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data
*sdata
,
226 struct ieee80211_mgmt
*mgmt
,
228 struct ieee80211_rx_status
*rx_status
,
229 struct ieee802_11_elems
*elems
,
232 struct ieee80211_local
*local
= sdata
->local
;
234 struct cfg80211_bss
*cbss
;
235 struct ieee80211_bss
*bss
;
236 struct sta_info
*sta
;
237 struct ieee80211_channel
*channel
;
238 u64 beacon_timestamp
, rx_timestamp
;
240 enum ieee80211_band band
= rx_status
->band
;
242 if (elems
->ds_params
&& elems
->ds_params_len
== 1)
243 freq
= ieee80211_channel_to_frequency(elems
->ds_params
[0]);
245 freq
= rx_status
->freq
;
247 channel
= ieee80211_get_channel(local
->hw
.wiphy
, freq
);
249 if (!channel
|| channel
->flags
& IEEE80211_CHAN_DISABLED
)
252 if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
&& elems
->supp_rates
&&
253 memcmp(mgmt
->bssid
, sdata
->u
.ibss
.bssid
, ETH_ALEN
) == 0) {
254 supp_rates
= ieee80211_sta_get_rates(local
, elems
, band
);
258 sta
= sta_info_get(sdata
, mgmt
->sa
);
262 prev_rates
= sta
->sta
.supp_rates
[band
];
263 /* make sure mandatory rates are always added */
264 sta
->sta
.supp_rates
[band
] = supp_rates
|
265 ieee80211_mandatory_rates(local
, band
);
267 #ifdef CONFIG_MAC80211_IBSS_DEBUG
268 if (sta
->sta
.supp_rates
[band
] != prev_rates
)
269 printk(KERN_DEBUG
"%s: updated supp_rates set "
270 "for %pM based on beacon info (0x%llx | "
271 "0x%llx -> 0x%llx)\n",
274 (unsigned long long) prev_rates
,
275 (unsigned long long) supp_rates
,
276 (unsigned long long) sta
->sta
.supp_rates
[band
]);
279 ieee80211_ibss_add_sta(sdata
, mgmt
->bssid
, mgmt
->sa
, supp_rates
);
284 bss
= ieee80211_bss_info_update(local
, rx_status
, mgmt
, len
, elems
,
289 cbss
= container_of((void *)bss
, struct cfg80211_bss
, priv
);
291 /* was just updated in ieee80211_bss_info_update */
292 beacon_timestamp
= cbss
->tsf
;
294 /* check if we need to merge IBSS */
296 /* merge only on beacons (???) */
300 /* we use a fixed BSSID */
301 if (sdata
->u
.ibss
.bssid
)
305 if (!(cbss
->capability
& WLAN_CAPABILITY_IBSS
))
308 /* different channel */
309 if (cbss
->channel
!= local
->oper_channel
)
313 if (elems
->ssid_len
!= sdata
->u
.ibss
.ssid_len
||
314 memcmp(elems
->ssid
, sdata
->u
.ibss
.ssid
,
315 sdata
->u
.ibss
.ssid_len
))
319 if (memcmp(cbss
->bssid
, sdata
->u
.ibss
.bssid
, ETH_ALEN
) == 0)
322 if (rx_status
->flag
& RX_FLAG_TSFT
) {
324 * For correct IBSS merging we need mactime; since mactime is
325 * defined as the time the first data symbol of the frame hits
326 * the PHY, and the timestamp of the beacon is defined as "the
327 * time that the data symbol containing the first bit of the
328 * timestamp is transmitted to the PHY plus the transmitting
329 * STA's delays through its local PHY from the MAC-PHY
330 * interface to its interface with the WM" (802.11 11.1.2)
331 * - equals the time this bit arrives at the receiver - we have
332 * to take into account the offset between the two.
334 * E.g. at 1 MBit that means mactime is 192 usec earlier
335 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
339 if (rx_status
->flag
& RX_FLAG_HT
)
340 rate
= 65; /* TODO: HT rates */
342 rate
= local
->hw
.wiphy
->bands
[band
]->
343 bitrates
[rx_status
->rate_idx
].bitrate
;
345 rx_timestamp
= rx_status
->mactime
+ (24 * 8 * 10 / rate
);
348 * second best option: get current TSF
349 * (will return -1 if not supported)
351 rx_timestamp
= drv_get_tsf(local
);
354 #ifdef CONFIG_MAC80211_IBSS_DEBUG
355 printk(KERN_DEBUG
"RX beacon SA=%pM BSSID="
356 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
357 mgmt
->sa
, mgmt
->bssid
,
358 (unsigned long long)rx_timestamp
,
359 (unsigned long long)beacon_timestamp
,
360 (unsigned long long)(rx_timestamp
- beacon_timestamp
),
364 /* give slow hardware some time to do the TSF sync */
365 if (rx_timestamp
< IEEE80211_IBSS_MERGE_DELAY
)
368 if (beacon_timestamp
> rx_timestamp
) {
369 #ifdef CONFIG_MAC80211_IBSS_DEBUG
370 printk(KERN_DEBUG
"%s: beacon TSF higher than "
371 "local TSF - IBSS merge with BSSID %pM\n",
372 sdata
->name
, mgmt
->bssid
);
374 ieee80211_sta_join_ibss(sdata
, bss
);
375 ieee80211_ibss_add_sta(sdata
, mgmt
->bssid
, mgmt
->sa
, supp_rates
);
379 ieee80211_rx_bss_put(local
, bss
);
383 * Add a new IBSS station, will also be called by the RX code when,
384 * in IBSS mode, receiving a frame from a yet-unknown station, hence
385 * must be callable in atomic context.
387 struct sta_info
*ieee80211_ibss_add_sta(struct ieee80211_sub_if_data
*sdata
,
388 u8
*bssid
,u8
*addr
, u32 supp_rates
)
390 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
391 struct ieee80211_local
*local
= sdata
->local
;
392 struct sta_info
*sta
;
393 int band
= local
->hw
.conf
.channel
->band
;
396 * XXX: Consider removing the least recently used entry and
397 * allow new one to be added.
399 if (local
->num_sta
>= IEEE80211_IBSS_MAX_STA_ENTRIES
) {
401 printk(KERN_DEBUG
"%s: No room for a new IBSS STA entry %pM\n",
406 if (ifibss
->state
== IEEE80211_IBSS_MLME_SEARCH
)
409 if (compare_ether_addr(bssid
, sdata
->u
.ibss
.bssid
))
412 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
413 printk(KERN_DEBUG
"%s: Adding new IBSS station %pM (dev=%s)\n",
414 wiphy_name(local
->hw
.wiphy
), addr
, sdata
->name
);
417 sta
= sta_info_alloc(sdata
, addr
, GFP_ATOMIC
);
421 set_sta_flags(sta
, WLAN_STA_AUTHORIZED
);
423 /* make sure mandatory rates are always added */
424 sta
->sta
.supp_rates
[band
] = supp_rates
|
425 ieee80211_mandatory_rates(local
, band
);
427 rate_control_rate_init(sta
);
429 if (sta_info_insert(sta
))
435 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data
*sdata
)
437 struct ieee80211_local
*local
= sdata
->local
;
439 struct sta_info
*sta
;
443 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
444 if (sta
->sdata
== sdata
&&
445 time_after(sta
->last_rx
+ IEEE80211_IBSS_MERGE_INTERVAL
,
458 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data
*sdata
)
460 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
462 mod_timer(&ifibss
->timer
,
463 round_jiffies(jiffies
+ IEEE80211_IBSS_MERGE_INTERVAL
));
465 ieee80211_sta_expire(sdata
, IEEE80211_IBSS_INACTIVITY_LIMIT
);
467 if (time_before(jiffies
, ifibss
->last_scan_completed
+
468 IEEE80211_IBSS_MERGE_INTERVAL
))
471 if (ieee80211_sta_active_ibss(sdata
))
474 if (ifibss
->fixed_channel
)
477 printk(KERN_DEBUG
"%s: No active IBSS STAs - trying to scan for other "
478 "IBSS networks with same SSID (merge)\n", sdata
->name
);
480 ieee80211_request_internal_scan(sdata
, ifibss
->ssid
, ifibss
->ssid_len
);
483 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data
*sdata
)
485 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
486 struct ieee80211_local
*local
= sdata
->local
;
487 struct ieee80211_supported_band
*sband
;
492 if (ifibss
->fixed_bssid
) {
493 memcpy(bssid
, ifibss
->bssid
, ETH_ALEN
);
495 /* Generate random, not broadcast, locally administered BSSID. Mix in
496 * own MAC address to make sure that devices that do not have proper
497 * random number generator get different BSSID. */
498 get_random_bytes(bssid
, ETH_ALEN
);
499 for (i
= 0; i
< ETH_ALEN
; i
++)
500 bssid
[i
] ^= sdata
->vif
.addr
[i
];
505 printk(KERN_DEBUG
"%s: Creating new IBSS network, BSSID %pM\n",
508 sband
= local
->hw
.wiphy
->bands
[ifibss
->channel
->band
];
510 capability
= WLAN_CAPABILITY_IBSS
;
513 capability
|= WLAN_CAPABILITY_PRIVACY
;
515 sdata
->drop_unencrypted
= 0;
517 __ieee80211_sta_join_ibss(sdata
, bssid
, sdata
->vif
.bss_conf
.beacon_int
,
518 ifibss
->channel
, 3, /* first two are basic */
522 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data
*sdata
)
524 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
525 struct ieee80211_local
*local
= sdata
->local
;
526 struct cfg80211_bss
*cbss
;
527 struct ieee80211_channel
*chan
= NULL
;
528 const u8
*bssid
= NULL
;
532 active_ibss
= ieee80211_sta_active_ibss(sdata
);
533 #ifdef CONFIG_MAC80211_IBSS_DEBUG
534 printk(KERN_DEBUG
"%s: sta_find_ibss (active_ibss=%d)\n",
535 sdata
->name
, active_ibss
);
536 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
541 capability
= WLAN_CAPABILITY_IBSS
;
543 capability
|= WLAN_CAPABILITY_PRIVACY
;
544 if (ifibss
->fixed_bssid
)
545 bssid
= ifibss
->bssid
;
546 if (ifibss
->fixed_channel
)
547 chan
= ifibss
->channel
;
548 if (!is_zero_ether_addr(ifibss
->bssid
))
549 bssid
= ifibss
->bssid
;
550 cbss
= cfg80211_get_bss(local
->hw
.wiphy
, chan
, bssid
,
551 ifibss
->ssid
, ifibss
->ssid_len
,
552 WLAN_CAPABILITY_IBSS
| WLAN_CAPABILITY_PRIVACY
,
556 struct ieee80211_bss
*bss
;
558 bss
= (void *)cbss
->priv
;
559 #ifdef CONFIG_MAC80211_IBSS_DEBUG
560 printk(KERN_DEBUG
" sta_find_ibss: selected %pM current "
561 "%pM\n", cbss
->bssid
, ifibss
->bssid
);
562 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
564 printk(KERN_DEBUG
"%s: Selected IBSS BSSID %pM"
565 " based on configured SSID\n",
566 sdata
->name
, cbss
->bssid
);
568 ieee80211_sta_join_ibss(sdata
, bss
);
569 ieee80211_rx_bss_put(local
, bss
);
573 #ifdef CONFIG_MAC80211_IBSS_DEBUG
574 printk(KERN_DEBUG
" did not try to join ibss\n");
575 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
577 /* Selected IBSS not found in current scan results - try to scan */
578 if (ifibss
->state
== IEEE80211_IBSS_MLME_JOINED
&&
579 !ieee80211_sta_active_ibss(sdata
)) {
580 mod_timer(&ifibss
->timer
,
581 round_jiffies(jiffies
+ IEEE80211_IBSS_MERGE_INTERVAL
));
582 } else if (time_after(jiffies
, ifibss
->last_scan_completed
+
583 IEEE80211_SCAN_INTERVAL
)) {
584 printk(KERN_DEBUG
"%s: Trigger new scan to find an IBSS to "
585 "join\n", sdata
->name
);
587 ieee80211_request_internal_scan(sdata
, ifibss
->ssid
,
589 } else if (ifibss
->state
!= IEEE80211_IBSS_MLME_JOINED
) {
590 int interval
= IEEE80211_SCAN_INTERVAL
;
592 if (time_after(jiffies
, ifibss
->ibss_join_req
+
593 IEEE80211_IBSS_JOIN_TIMEOUT
)) {
594 if (!(local
->oper_channel
->flags
& IEEE80211_CHAN_NO_IBSS
)) {
595 ieee80211_sta_create_ibss(sdata
);
598 printk(KERN_DEBUG
"%s: IBSS not allowed on"
599 " %d MHz\n", sdata
->name
,
600 local
->hw
.conf
.channel
->center_freq
);
602 /* No IBSS found - decrease scan interval and continue
604 interval
= IEEE80211_SCAN_INTERVAL_SLOW
;
607 ifibss
->state
= IEEE80211_IBSS_MLME_SEARCH
;
608 mod_timer(&ifibss
->timer
,
609 round_jiffies(jiffies
+ interval
));
613 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data
*sdata
,
614 struct ieee80211_mgmt
*mgmt
,
617 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
618 struct ieee80211_local
*local
= sdata
->local
;
621 struct ieee80211_mgmt
*resp
;
624 if (ifibss
->state
!= IEEE80211_IBSS_MLME_JOINED
||
625 len
< 24 + 2 || !ifibss
->presp
)
628 tx_last_beacon
= drv_tx_last_beacon(local
);
630 #ifdef CONFIG_MAC80211_IBSS_DEBUG
631 printk(KERN_DEBUG
"%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
632 " (tx_last_beacon=%d)\n",
633 sdata
->name
, mgmt
->sa
, mgmt
->da
,
634 mgmt
->bssid
, tx_last_beacon
);
635 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
640 if (memcmp(mgmt
->bssid
, ifibss
->bssid
, ETH_ALEN
) != 0 &&
641 memcmp(mgmt
->bssid
, "\xff\xff\xff\xff\xff\xff", ETH_ALEN
) != 0)
644 end
= ((u8
*) mgmt
) + len
;
645 pos
= mgmt
->u
.probe_req
.variable
;
646 if (pos
[0] != WLAN_EID_SSID
||
647 pos
+ 2 + pos
[1] > end
) {
648 #ifdef CONFIG_MAC80211_IBSS_DEBUG
649 printk(KERN_DEBUG
"%s: Invalid SSID IE in ProbeReq "
651 sdata
->name
, mgmt
->sa
);
656 (pos
[1] != ifibss
->ssid_len
||
657 !memcmp(pos
+ 2, ifibss
->ssid
, ifibss
->ssid_len
))) {
658 /* Ignore ProbeReq for foreign SSID */
662 /* Reply with ProbeResp */
663 skb
= skb_copy(ifibss
->presp
, GFP_KERNEL
);
667 resp
= (struct ieee80211_mgmt
*) skb
->data
;
668 memcpy(resp
->da
, mgmt
->sa
, ETH_ALEN
);
669 #ifdef CONFIG_MAC80211_IBSS_DEBUG
670 printk(KERN_DEBUG
"%s: Sending ProbeResp to %pM\n",
671 sdata
->name
, resp
->da
);
672 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
673 IEEE80211_SKB_CB(skb
)->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
674 ieee80211_tx_skb(sdata
, skb
);
677 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data
*sdata
,
678 struct ieee80211_mgmt
*mgmt
,
680 struct ieee80211_rx_status
*rx_status
)
683 struct ieee802_11_elems elems
;
685 if (memcmp(mgmt
->da
, sdata
->vif
.addr
, ETH_ALEN
))
686 return; /* ignore ProbeResp to foreign address */
688 baselen
= (u8
*) mgmt
->u
.probe_resp
.variable
- (u8
*) mgmt
;
692 ieee802_11_parse_elems(mgmt
->u
.probe_resp
.variable
, len
- baselen
,
695 ieee80211_rx_bss_info(sdata
, mgmt
, len
, rx_status
, &elems
, false);
698 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data
*sdata
,
699 struct ieee80211_mgmt
*mgmt
,
701 struct ieee80211_rx_status
*rx_status
)
704 struct ieee802_11_elems elems
;
706 /* Process beacon from the current BSS */
707 baselen
= (u8
*) mgmt
->u
.beacon
.variable
- (u8
*) mgmt
;
711 ieee802_11_parse_elems(mgmt
->u
.beacon
.variable
, len
- baselen
, &elems
);
713 ieee80211_rx_bss_info(sdata
, mgmt
, len
, rx_status
, &elems
, true);
716 static void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data
*sdata
,
719 struct ieee80211_rx_status
*rx_status
;
720 struct ieee80211_mgmt
*mgmt
;
723 rx_status
= IEEE80211_SKB_RXCB(skb
);
724 mgmt
= (struct ieee80211_mgmt
*) skb
->data
;
725 fc
= le16_to_cpu(mgmt
->frame_control
);
727 switch (fc
& IEEE80211_FCTL_STYPE
) {
728 case IEEE80211_STYPE_PROBE_REQ
:
729 ieee80211_rx_mgmt_probe_req(sdata
, mgmt
, skb
->len
);
731 case IEEE80211_STYPE_PROBE_RESP
:
732 ieee80211_rx_mgmt_probe_resp(sdata
, mgmt
, skb
->len
,
735 case IEEE80211_STYPE_BEACON
:
736 ieee80211_rx_mgmt_beacon(sdata
, mgmt
, skb
->len
,
739 case IEEE80211_STYPE_AUTH
:
740 ieee80211_rx_mgmt_auth_ibss(sdata
, mgmt
, skb
->len
);
747 static void ieee80211_ibss_work(struct work_struct
*work
)
749 struct ieee80211_sub_if_data
*sdata
=
750 container_of(work
, struct ieee80211_sub_if_data
, u
.ibss
.work
);
751 struct ieee80211_local
*local
= sdata
->local
;
752 struct ieee80211_if_ibss
*ifibss
;
755 if (WARN_ON(local
->suspended
))
758 if (!ieee80211_sdata_running(sdata
))
764 if (WARN_ON(sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
))
766 ifibss
= &sdata
->u
.ibss
;
768 while ((skb
= skb_dequeue(&ifibss
->skb_queue
)))
769 ieee80211_ibss_rx_queued_mgmt(sdata
, skb
);
771 if (!test_and_clear_bit(IEEE80211_IBSS_REQ_RUN
, &ifibss
->request
))
774 switch (ifibss
->state
) {
775 case IEEE80211_IBSS_MLME_SEARCH
:
776 ieee80211_sta_find_ibss(sdata
);
778 case IEEE80211_IBSS_MLME_JOINED
:
779 ieee80211_sta_merge_ibss(sdata
);
787 static void ieee80211_ibss_timer(unsigned long data
)
789 struct ieee80211_sub_if_data
*sdata
=
790 (struct ieee80211_sub_if_data
*) data
;
791 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
792 struct ieee80211_local
*local
= sdata
->local
;
794 if (local
->quiescing
) {
795 ifibss
->timer_running
= true;
799 set_bit(IEEE80211_IBSS_REQ_RUN
, &ifibss
->request
);
800 ieee80211_queue_work(&local
->hw
, &ifibss
->work
);
804 void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data
*sdata
)
806 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
808 cancel_work_sync(&ifibss
->work
);
809 if (del_timer_sync(&ifibss
->timer
))
810 ifibss
->timer_running
= true;
813 void ieee80211_ibss_restart(struct ieee80211_sub_if_data
*sdata
)
815 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
817 if (ifibss
->timer_running
) {
818 add_timer(&ifibss
->timer
);
819 ifibss
->timer_running
= false;
824 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data
*sdata
)
826 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
828 INIT_WORK(&ifibss
->work
, ieee80211_ibss_work
);
829 setup_timer(&ifibss
->timer
, ieee80211_ibss_timer
,
830 (unsigned long) sdata
);
831 skb_queue_head_init(&ifibss
->skb_queue
);
834 /* scan finished notification */
835 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local
*local
)
837 struct ieee80211_sub_if_data
*sdata
;
839 mutex_lock(&local
->iflist_mtx
);
840 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
841 if (!ieee80211_sdata_running(sdata
))
843 if (sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
845 if (!sdata
->u
.ibss
.ssid_len
)
847 sdata
->u
.ibss
.last_scan_completed
= jiffies
;
848 mod_timer(&sdata
->u
.ibss
.timer
, 0);
850 mutex_unlock(&local
->iflist_mtx
);
854 ieee80211_ibss_rx_mgmt(struct ieee80211_sub_if_data
*sdata
, struct sk_buff
*skb
)
856 struct ieee80211_local
*local
= sdata
->local
;
857 struct ieee80211_mgmt
*mgmt
;
861 return RX_DROP_MONITOR
;
863 mgmt
= (struct ieee80211_mgmt
*) skb
->data
;
864 fc
= le16_to_cpu(mgmt
->frame_control
);
866 switch (fc
& IEEE80211_FCTL_STYPE
) {
867 case IEEE80211_STYPE_PROBE_RESP
:
868 case IEEE80211_STYPE_BEACON
:
869 case IEEE80211_STYPE_PROBE_REQ
:
870 case IEEE80211_STYPE_AUTH
:
871 skb_queue_tail(&sdata
->u
.ibss
.skb_queue
, skb
);
872 ieee80211_queue_work(&local
->hw
, &sdata
->u
.ibss
.work
);
876 return RX_DROP_MONITOR
;
879 int ieee80211_ibss_join(struct ieee80211_sub_if_data
*sdata
,
880 struct cfg80211_ibss_params
*params
)
885 memcpy(sdata
->u
.ibss
.bssid
, params
->bssid
, ETH_ALEN
);
886 sdata
->u
.ibss
.fixed_bssid
= true;
888 sdata
->u
.ibss
.fixed_bssid
= false;
890 sdata
->u
.ibss
.privacy
= params
->privacy
;
892 sdata
->vif
.bss_conf
.beacon_int
= params
->beacon_interval
;
894 sdata
->u
.ibss
.channel
= params
->channel
;
895 sdata
->u
.ibss
.fixed_channel
= params
->channel_fixed
;
898 sdata
->u
.ibss
.ie
= kmemdup(params
->ie
, params
->ie_len
,
900 if (sdata
->u
.ibss
.ie
)
901 sdata
->u
.ibss
.ie_len
= params
->ie_len
;
904 skb
= dev_alloc_skb(sdata
->local
->hw
.extra_tx_headroom
+
908 4 /* IBSS params */ +
913 sdata
->u
.ibss
.skb
= skb
;
914 sdata
->u
.ibss
.state
= IEEE80211_IBSS_MLME_SEARCH
;
915 sdata
->u
.ibss
.ibss_join_req
= jiffies
;
917 memcpy(sdata
->u
.ibss
.ssid
, params
->ssid
, IEEE80211_MAX_SSID_LEN
);
920 * The ssid_len setting below is used to see whether
921 * we are active, and we need all other settings
922 * before that may get visible.
926 sdata
->u
.ibss
.ssid_len
= params
->ssid_len
;
928 ieee80211_recalc_idle(sdata
->local
);
930 set_bit(IEEE80211_IBSS_REQ_RUN
, &sdata
->u
.ibss
.request
);
931 ieee80211_queue_work(&sdata
->local
->hw
, &sdata
->u
.ibss
.work
);
936 int ieee80211_ibss_leave(struct ieee80211_sub_if_data
*sdata
)
940 del_timer_sync(&sdata
->u
.ibss
.timer
);
941 clear_bit(IEEE80211_IBSS_REQ_RUN
, &sdata
->u
.ibss
.request
);
942 cancel_work_sync(&sdata
->u
.ibss
.work
);
943 clear_bit(IEEE80211_IBSS_REQ_RUN
, &sdata
->u
.ibss
.request
);
945 sta_info_flush(sdata
->local
, sdata
);
948 kfree(sdata
->u
.ibss
.ie
);
949 skb
= sdata
->u
.ibss
.presp
;
950 rcu_assign_pointer(sdata
->u
.ibss
.presp
, NULL
);
951 ieee80211_bss_info_change_notify(sdata
, BSS_CHANGED_BEACON_ENABLED
);
955 skb_queue_purge(&sdata
->u
.ibss
.skb_queue
);
956 memset(sdata
->u
.ibss
.bssid
, 0, ETH_ALEN
);
957 sdata
->u
.ibss
.ssid_len
= 0;
959 ieee80211_recalc_idle(sdata
->local
);