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 /* if merging, indicate to driver that we leave the old IBSS */
95 if (sdata
->vif
.bss_conf
.ibss_joined
) {
96 sdata
->vif
.bss_conf
.ibss_joined
= false;
97 ieee80211_bss_info_change_notify(sdata
, BSS_CHANGED_IBSS
);
100 memcpy(ifibss
->bssid
, bssid
, ETH_ALEN
);
102 sdata
->drop_unencrypted
= capability
& WLAN_CAPABILITY_PRIVACY
? 1 : 0;
104 local
->oper_channel
= chan
;
105 local
->oper_channel_type
= NL80211_CHAN_NO_HT
;
106 ieee80211_hw_config(local
, IEEE80211_CONF_CHANGE_CHANNEL
);
108 sband
= local
->hw
.wiphy
->bands
[chan
->band
];
110 /* build supported rates array */
112 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
113 int rate
= sband
->bitrates
[i
].bitrate
;
115 if (basic_rates
& BIT(i
))
117 *pos
++ = basic
| (u8
) (rate
/ 5);
120 /* Build IBSS probe response */
121 mgmt
= (void *) skb_put(skb
, 24 + sizeof(mgmt
->u
.beacon
));
122 memset(mgmt
, 0, 24 + sizeof(mgmt
->u
.beacon
));
123 mgmt
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
124 IEEE80211_STYPE_PROBE_RESP
);
125 memset(mgmt
->da
, 0xff, ETH_ALEN
);
126 memcpy(mgmt
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
127 memcpy(mgmt
->bssid
, ifibss
->bssid
, ETH_ALEN
);
128 mgmt
->u
.beacon
.beacon_int
= cpu_to_le16(beacon_int
);
129 mgmt
->u
.beacon
.timestamp
= cpu_to_le64(tsf
);
130 mgmt
->u
.beacon
.capab_info
= cpu_to_le16(capability
);
132 pos
= skb_put(skb
, 2 + ifibss
->ssid_len
);
133 *pos
++ = WLAN_EID_SSID
;
134 *pos
++ = ifibss
->ssid_len
;
135 memcpy(pos
, ifibss
->ssid
, ifibss
->ssid_len
);
137 rates
= sband
->n_bitrates
;
140 pos
= skb_put(skb
, 2 + rates
);
141 *pos
++ = WLAN_EID_SUPP_RATES
;
143 memcpy(pos
, supp_rates
, rates
);
145 if (sband
->band
== IEEE80211_BAND_2GHZ
) {
146 pos
= skb_put(skb
, 2 + 1);
147 *pos
++ = WLAN_EID_DS_PARAMS
;
149 *pos
++ = ieee80211_frequency_to_channel(chan
->center_freq
);
152 pos
= skb_put(skb
, 2 + 2);
153 *pos
++ = WLAN_EID_IBSS_PARAMS
;
155 /* FIX: set ATIM window based on scan results */
159 if (sband
->n_bitrates
> 8) {
160 rates
= sband
->n_bitrates
- 8;
161 pos
= skb_put(skb
, 2 + rates
);
162 *pos
++ = WLAN_EID_EXT_SUPP_RATES
;
164 memcpy(pos
, &supp_rates
[8], rates
);
168 memcpy(skb_put(skb
, ifibss
->ie_len
),
169 ifibss
->ie
, ifibss
->ie_len
);
171 rcu_assign_pointer(ifibss
->presp
, skb
);
173 sdata
->vif
.bss_conf
.beacon_int
= beacon_int
;
174 bss_change
= BSS_CHANGED_BEACON_INT
;
175 bss_change
|= ieee80211_reset_erp_info(sdata
);
176 bss_change
|= BSS_CHANGED_BSSID
;
177 bss_change
|= BSS_CHANGED_BEACON
;
178 bss_change
|= BSS_CHANGED_BEACON_ENABLED
;
179 bss_change
|= BSS_CHANGED_IBSS
;
180 sdata
->vif
.bss_conf
.ibss_joined
= true;
181 ieee80211_bss_info_change_notify(sdata
, bss_change
);
183 ieee80211_sta_def_wmm_params(sdata
, sband
->n_bitrates
, supp_rates
);
185 ifibss
->state
= IEEE80211_IBSS_MLME_JOINED
;
186 mod_timer(&ifibss
->timer
,
187 round_jiffies(jiffies
+ IEEE80211_IBSS_MERGE_INTERVAL
));
189 bss
= cfg80211_inform_bss_frame(local
->hw
.wiphy
, local
->hw
.conf
.channel
,
190 mgmt
, skb
->len
, 0, GFP_KERNEL
);
191 cfg80211_put_bss(bss
);
192 cfg80211_ibss_joined(sdata
->dev
, ifibss
->bssid
, GFP_KERNEL
);
195 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data
*sdata
,
196 struct ieee80211_bss
*bss
)
198 struct cfg80211_bss
*cbss
=
199 container_of((void *)bss
, struct cfg80211_bss
, priv
);
200 struct ieee80211_supported_band
*sband
;
203 u16 beacon_int
= cbss
->beacon_interval
;
208 sband
= sdata
->local
->hw
.wiphy
->bands
[cbss
->channel
->band
];
212 for (i
= 0; i
< bss
->supp_rates_len
; i
++) {
213 int rate
= (bss
->supp_rates
[i
] & 0x7f) * 5;
214 bool is_basic
= !!(bss
->supp_rates
[i
] & 0x80);
216 for (j
= 0; j
< sband
->n_bitrates
; j
++) {
217 if (sband
->bitrates
[j
].bitrate
== rate
) {
219 basic_rates
|= BIT(j
);
225 __ieee80211_sta_join_ibss(sdata
, cbss
->bssid
,
233 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data
*sdata
,
234 struct ieee80211_mgmt
*mgmt
,
236 struct ieee80211_rx_status
*rx_status
,
237 struct ieee802_11_elems
*elems
,
240 struct ieee80211_local
*local
= sdata
->local
;
242 struct cfg80211_bss
*cbss
;
243 struct ieee80211_bss
*bss
;
244 struct sta_info
*sta
;
245 struct ieee80211_channel
*channel
;
246 u64 beacon_timestamp
, rx_timestamp
;
248 enum ieee80211_band band
= rx_status
->band
;
250 if (elems
->ds_params
&& elems
->ds_params_len
== 1)
251 freq
= ieee80211_channel_to_frequency(elems
->ds_params
[0]);
253 freq
= rx_status
->freq
;
255 channel
= ieee80211_get_channel(local
->hw
.wiphy
, freq
);
257 if (!channel
|| channel
->flags
& IEEE80211_CHAN_DISABLED
)
260 if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
&& elems
->supp_rates
&&
261 memcmp(mgmt
->bssid
, sdata
->u
.ibss
.bssid
, ETH_ALEN
) == 0) {
262 supp_rates
= ieee80211_sta_get_rates(local
, elems
, band
);
266 sta
= sta_info_get(sdata
, mgmt
->sa
);
270 prev_rates
= sta
->sta
.supp_rates
[band
];
271 /* make sure mandatory rates are always added */
272 sta
->sta
.supp_rates
[band
] = supp_rates
|
273 ieee80211_mandatory_rates(local
, band
);
275 if (sta
->sta
.supp_rates
[band
] != prev_rates
) {
276 #ifdef CONFIG_MAC80211_IBSS_DEBUG
277 printk(KERN_DEBUG
"%s: updated supp_rates set "
278 "for %pM based on beacon/probe_response "
280 sdata
->name
, sta
->sta
.addr
,
281 prev_rates
, sta
->sta
.supp_rates
[band
]);
283 rate_control_rate_init(sta
);
288 ieee80211_ibss_add_sta(sdata
, mgmt
->bssid
, mgmt
->sa
,
289 supp_rates
, GFP_KERNEL
);
293 bss
= ieee80211_bss_info_update(local
, rx_status
, mgmt
, len
, elems
,
298 cbss
= container_of((void *)bss
, struct cfg80211_bss
, priv
);
300 /* was just updated in ieee80211_bss_info_update */
301 beacon_timestamp
= cbss
->tsf
;
303 /* check if we need to merge IBSS */
305 /* we use a fixed BSSID */
306 if (sdata
->u
.ibss
.fixed_bssid
)
310 if (!(cbss
->capability
& WLAN_CAPABILITY_IBSS
))
313 /* different channel */
314 if (cbss
->channel
!= local
->oper_channel
)
318 if (elems
->ssid_len
!= sdata
->u
.ibss
.ssid_len
||
319 memcmp(elems
->ssid
, sdata
->u
.ibss
.ssid
,
320 sdata
->u
.ibss
.ssid_len
))
324 if (memcmp(cbss
->bssid
, sdata
->u
.ibss
.bssid
, ETH_ALEN
) == 0)
327 if (rx_status
->flag
& RX_FLAG_TSFT
) {
329 * For correct IBSS merging we need mactime; since mactime is
330 * defined as the time the first data symbol of the frame hits
331 * the PHY, and the timestamp of the beacon is defined as "the
332 * time that the data symbol containing the first bit of the
333 * timestamp is transmitted to the PHY plus the transmitting
334 * STA's delays through its local PHY from the MAC-PHY
335 * interface to its interface with the WM" (802.11 11.1.2)
336 * - equals the time this bit arrives at the receiver - we have
337 * to take into account the offset between the two.
339 * E.g. at 1 MBit that means mactime is 192 usec earlier
340 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
344 if (rx_status
->flag
& RX_FLAG_HT
)
345 rate
= 65; /* TODO: HT rates */
347 rate
= local
->hw
.wiphy
->bands
[band
]->
348 bitrates
[rx_status
->rate_idx
].bitrate
;
350 rx_timestamp
= rx_status
->mactime
+ (24 * 8 * 10 / rate
);
353 * second best option: get current TSF
354 * (will return -1 if not supported)
356 rx_timestamp
= drv_get_tsf(local
);
359 #ifdef CONFIG_MAC80211_IBSS_DEBUG
360 printk(KERN_DEBUG
"RX beacon SA=%pM BSSID="
361 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
362 mgmt
->sa
, mgmt
->bssid
,
363 (unsigned long long)rx_timestamp
,
364 (unsigned long long)beacon_timestamp
,
365 (unsigned long long)(rx_timestamp
- beacon_timestamp
),
369 /* give slow hardware some time to do the TSF sync */
370 if (rx_timestamp
< IEEE80211_IBSS_MERGE_DELAY
)
373 if (beacon_timestamp
> rx_timestamp
) {
374 #ifdef CONFIG_MAC80211_IBSS_DEBUG
375 printk(KERN_DEBUG
"%s: beacon TSF higher than "
376 "local TSF - IBSS merge with BSSID %pM\n",
377 sdata
->name
, mgmt
->bssid
);
379 ieee80211_sta_join_ibss(sdata
, bss
);
380 supp_rates
= ieee80211_sta_get_rates(local
, elems
, band
);
381 ieee80211_ibss_add_sta(sdata
, mgmt
->bssid
, mgmt
->sa
,
382 supp_rates
, GFP_KERNEL
);
386 ieee80211_rx_bss_put(local
, bss
);
390 * Add a new IBSS station, will also be called by the RX code when,
391 * in IBSS mode, receiving a frame from a yet-unknown station, hence
392 * must be callable in atomic context.
394 struct sta_info
*ieee80211_ibss_add_sta(struct ieee80211_sub_if_data
*sdata
,
395 u8
*bssid
,u8
*addr
, u32 supp_rates
,
398 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
399 struct ieee80211_local
*local
= sdata
->local
;
400 struct sta_info
*sta
;
401 int band
= local
->hw
.conf
.channel
->band
;
404 * XXX: Consider removing the least recently used entry and
405 * allow new one to be added.
407 if (local
->num_sta
>= IEEE80211_IBSS_MAX_STA_ENTRIES
) {
409 printk(KERN_DEBUG
"%s: No room for a new IBSS STA entry %pM\n",
414 if (ifibss
->state
== IEEE80211_IBSS_MLME_SEARCH
)
417 if (compare_ether_addr(bssid
, sdata
->u
.ibss
.bssid
))
420 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
421 printk(KERN_DEBUG
"%s: Adding new IBSS station %pM (dev=%s)\n",
422 wiphy_name(local
->hw
.wiphy
), addr
, sdata
->name
);
425 sta
= sta_info_alloc(sdata
, addr
, gfp
);
429 set_sta_flags(sta
, WLAN_STA_AUTHORIZED
);
431 /* make sure mandatory rates are always added */
432 sta
->sta
.supp_rates
[band
] = supp_rates
|
433 ieee80211_mandatory_rates(local
, band
);
435 rate_control_rate_init(sta
);
437 /* If it fails, maybe we raced another insertion? */
438 if (sta_info_insert(sta
))
439 return sta_info_get(sdata
, addr
);
443 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data
*sdata
)
445 struct ieee80211_local
*local
= sdata
->local
;
447 struct sta_info
*sta
;
451 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
452 if (sta
->sdata
== sdata
&&
453 time_after(sta
->last_rx
+ IEEE80211_IBSS_MERGE_INTERVAL
,
466 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
469 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data
*sdata
)
471 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
473 mod_timer(&ifibss
->timer
,
474 round_jiffies(jiffies
+ IEEE80211_IBSS_MERGE_INTERVAL
));
476 ieee80211_sta_expire(sdata
, IEEE80211_IBSS_INACTIVITY_LIMIT
);
478 if (time_before(jiffies
, ifibss
->last_scan_completed
+
479 IEEE80211_IBSS_MERGE_INTERVAL
))
482 if (ieee80211_sta_active_ibss(sdata
))
485 if (ifibss
->fixed_channel
)
488 printk(KERN_DEBUG
"%s: No active IBSS STAs - trying to scan for other "
489 "IBSS networks with same SSID (merge)\n", sdata
->name
);
491 ieee80211_request_internal_scan(sdata
, ifibss
->ssid
, ifibss
->ssid_len
);
494 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data
*sdata
)
496 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
497 struct ieee80211_local
*local
= sdata
->local
;
498 struct ieee80211_supported_band
*sband
;
503 if (ifibss
->fixed_bssid
) {
504 memcpy(bssid
, ifibss
->bssid
, ETH_ALEN
);
506 /* Generate random, not broadcast, locally administered BSSID. Mix in
507 * own MAC address to make sure that devices that do not have proper
508 * random number generator get different BSSID. */
509 get_random_bytes(bssid
, ETH_ALEN
);
510 for (i
= 0; i
< ETH_ALEN
; i
++)
511 bssid
[i
] ^= sdata
->vif
.addr
[i
];
516 printk(KERN_DEBUG
"%s: Creating new IBSS network, BSSID %pM\n",
519 sband
= local
->hw
.wiphy
->bands
[ifibss
->channel
->band
];
521 capability
= WLAN_CAPABILITY_IBSS
;
524 capability
|= WLAN_CAPABILITY_PRIVACY
;
526 sdata
->drop_unencrypted
= 0;
528 __ieee80211_sta_join_ibss(sdata
, bssid
, sdata
->vif
.bss_conf
.beacon_int
,
529 ifibss
->channel
, 3, /* first two are basic */
534 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
537 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data
*sdata
)
539 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
540 struct ieee80211_local
*local
= sdata
->local
;
541 struct cfg80211_bss
*cbss
;
542 struct ieee80211_channel
*chan
= NULL
;
543 const u8
*bssid
= NULL
;
547 active_ibss
= ieee80211_sta_active_ibss(sdata
);
548 #ifdef CONFIG_MAC80211_IBSS_DEBUG
549 printk(KERN_DEBUG
"%s: sta_find_ibss (active_ibss=%d)\n",
550 sdata
->name
, active_ibss
);
551 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
556 capability
= WLAN_CAPABILITY_IBSS
;
558 capability
|= WLAN_CAPABILITY_PRIVACY
;
559 if (ifibss
->fixed_bssid
)
560 bssid
= ifibss
->bssid
;
561 if (ifibss
->fixed_channel
)
562 chan
= ifibss
->channel
;
563 if (!is_zero_ether_addr(ifibss
->bssid
))
564 bssid
= ifibss
->bssid
;
565 cbss
= cfg80211_get_bss(local
->hw
.wiphy
, chan
, bssid
,
566 ifibss
->ssid
, ifibss
->ssid_len
,
567 WLAN_CAPABILITY_IBSS
| WLAN_CAPABILITY_PRIVACY
,
571 struct ieee80211_bss
*bss
;
573 bss
= (void *)cbss
->priv
;
574 #ifdef CONFIG_MAC80211_IBSS_DEBUG
575 printk(KERN_DEBUG
" sta_find_ibss: selected %pM current "
576 "%pM\n", cbss
->bssid
, ifibss
->bssid
);
577 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
579 printk(KERN_DEBUG
"%s: Selected IBSS BSSID %pM"
580 " based on configured SSID\n",
581 sdata
->name
, cbss
->bssid
);
583 ieee80211_sta_join_ibss(sdata
, bss
);
584 ieee80211_rx_bss_put(local
, bss
);
588 #ifdef CONFIG_MAC80211_IBSS_DEBUG
589 printk(KERN_DEBUG
" did not try to join ibss\n");
590 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
592 /* Selected IBSS not found in current scan results - try to scan */
593 if (time_after(jiffies
, ifibss
->last_scan_completed
+
594 IEEE80211_SCAN_INTERVAL
)) {
595 printk(KERN_DEBUG
"%s: Trigger new scan to find an IBSS to "
596 "join\n", sdata
->name
);
598 ieee80211_request_internal_scan(sdata
, ifibss
->ssid
,
601 int interval
= IEEE80211_SCAN_INTERVAL
;
603 if (time_after(jiffies
, ifibss
->ibss_join_req
+
604 IEEE80211_IBSS_JOIN_TIMEOUT
)) {
605 if (!(local
->oper_channel
->flags
& IEEE80211_CHAN_NO_IBSS
)) {
606 ieee80211_sta_create_ibss(sdata
);
609 printk(KERN_DEBUG
"%s: IBSS not allowed on"
610 " %d MHz\n", sdata
->name
,
611 local
->hw
.conf
.channel
->center_freq
);
613 /* No IBSS found - decrease scan interval and continue
615 interval
= IEEE80211_SCAN_INTERVAL_SLOW
;
618 mod_timer(&ifibss
->timer
,
619 round_jiffies(jiffies
+ interval
));
623 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data
*sdata
,
624 struct ieee80211_mgmt
*mgmt
,
627 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
628 struct ieee80211_local
*local
= sdata
->local
;
631 struct ieee80211_mgmt
*resp
;
634 if (ifibss
->state
!= IEEE80211_IBSS_MLME_JOINED
||
635 len
< 24 + 2 || !ifibss
->presp
)
638 tx_last_beacon
= drv_tx_last_beacon(local
);
640 #ifdef CONFIG_MAC80211_IBSS_DEBUG
641 printk(KERN_DEBUG
"%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
642 " (tx_last_beacon=%d)\n",
643 sdata
->name
, mgmt
->sa
, mgmt
->da
,
644 mgmt
->bssid
, tx_last_beacon
);
645 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
650 if (memcmp(mgmt
->bssid
, ifibss
->bssid
, ETH_ALEN
) != 0 &&
651 memcmp(mgmt
->bssid
, "\xff\xff\xff\xff\xff\xff", ETH_ALEN
) != 0)
654 end
= ((u8
*) mgmt
) + len
;
655 pos
= mgmt
->u
.probe_req
.variable
;
656 if (pos
[0] != WLAN_EID_SSID
||
657 pos
+ 2 + pos
[1] > end
) {
658 #ifdef CONFIG_MAC80211_IBSS_DEBUG
659 printk(KERN_DEBUG
"%s: Invalid SSID IE in ProbeReq "
661 sdata
->name
, mgmt
->sa
);
666 (pos
[1] != ifibss
->ssid_len
||
667 memcmp(pos
+ 2, ifibss
->ssid
, ifibss
->ssid_len
))) {
668 /* Ignore ProbeReq for foreign SSID */
672 /* Reply with ProbeResp */
673 skb
= skb_copy(ifibss
->presp
, GFP_KERNEL
);
677 resp
= (struct ieee80211_mgmt
*) skb
->data
;
678 memcpy(resp
->da
, mgmt
->sa
, ETH_ALEN
);
679 #ifdef CONFIG_MAC80211_IBSS_DEBUG
680 printk(KERN_DEBUG
"%s: Sending ProbeResp to %pM\n",
681 sdata
->name
, resp
->da
);
682 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
683 IEEE80211_SKB_CB(skb
)->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
684 ieee80211_tx_skb(sdata
, skb
);
687 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data
*sdata
,
688 struct ieee80211_mgmt
*mgmt
,
690 struct ieee80211_rx_status
*rx_status
)
693 struct ieee802_11_elems elems
;
695 if (memcmp(mgmt
->da
, sdata
->vif
.addr
, ETH_ALEN
))
696 return; /* ignore ProbeResp to foreign address */
698 baselen
= (u8
*) mgmt
->u
.probe_resp
.variable
- (u8
*) mgmt
;
702 ieee802_11_parse_elems(mgmt
->u
.probe_resp
.variable
, len
- baselen
,
705 ieee80211_rx_bss_info(sdata
, mgmt
, len
, rx_status
, &elems
, false);
708 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data
*sdata
,
709 struct ieee80211_mgmt
*mgmt
,
711 struct ieee80211_rx_status
*rx_status
)
714 struct ieee802_11_elems elems
;
716 /* Process beacon from the current BSS */
717 baselen
= (u8
*) mgmt
->u
.beacon
.variable
- (u8
*) mgmt
;
721 ieee802_11_parse_elems(mgmt
->u
.beacon
.variable
, len
- baselen
, &elems
);
723 ieee80211_rx_bss_info(sdata
, mgmt
, len
, rx_status
, &elems
, true);
726 static void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data
*sdata
,
729 struct ieee80211_rx_status
*rx_status
;
730 struct ieee80211_mgmt
*mgmt
;
733 rx_status
= IEEE80211_SKB_RXCB(skb
);
734 mgmt
= (struct ieee80211_mgmt
*) skb
->data
;
735 fc
= le16_to_cpu(mgmt
->frame_control
);
737 switch (fc
& IEEE80211_FCTL_STYPE
) {
738 case IEEE80211_STYPE_PROBE_REQ
:
739 ieee80211_rx_mgmt_probe_req(sdata
, mgmt
, skb
->len
);
741 case IEEE80211_STYPE_PROBE_RESP
:
742 ieee80211_rx_mgmt_probe_resp(sdata
, mgmt
, skb
->len
,
745 case IEEE80211_STYPE_BEACON
:
746 ieee80211_rx_mgmt_beacon(sdata
, mgmt
, skb
->len
,
749 case IEEE80211_STYPE_AUTH
:
750 ieee80211_rx_mgmt_auth_ibss(sdata
, mgmt
, skb
->len
);
757 static void ieee80211_ibss_work(struct work_struct
*work
)
759 struct ieee80211_sub_if_data
*sdata
=
760 container_of(work
, struct ieee80211_sub_if_data
, u
.ibss
.work
);
761 struct ieee80211_local
*local
= sdata
->local
;
762 struct ieee80211_if_ibss
*ifibss
;
765 if (WARN_ON(local
->suspended
))
768 if (!ieee80211_sdata_running(sdata
))
774 if (WARN_ON(sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
))
776 ifibss
= &sdata
->u
.ibss
;
778 while ((skb
= skb_dequeue(&ifibss
->skb_queue
)))
779 ieee80211_ibss_rx_queued_mgmt(sdata
, skb
);
781 if (!test_and_clear_bit(IEEE80211_IBSS_REQ_RUN
, &ifibss
->request
))
784 switch (ifibss
->state
) {
785 case IEEE80211_IBSS_MLME_SEARCH
:
786 ieee80211_sta_find_ibss(sdata
);
788 case IEEE80211_IBSS_MLME_JOINED
:
789 ieee80211_sta_merge_ibss(sdata
);
797 static void ieee80211_ibss_timer(unsigned long data
)
799 struct ieee80211_sub_if_data
*sdata
=
800 (struct ieee80211_sub_if_data
*) data
;
801 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
802 struct ieee80211_local
*local
= sdata
->local
;
804 if (local
->quiescing
) {
805 ifibss
->timer_running
= true;
809 set_bit(IEEE80211_IBSS_REQ_RUN
, &ifibss
->request
);
810 ieee80211_queue_work(&local
->hw
, &ifibss
->work
);
814 void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data
*sdata
)
816 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
818 cancel_work_sync(&ifibss
->work
);
819 if (del_timer_sync(&ifibss
->timer
))
820 ifibss
->timer_running
= true;
823 void ieee80211_ibss_restart(struct ieee80211_sub_if_data
*sdata
)
825 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
827 if (ifibss
->timer_running
) {
828 add_timer(&ifibss
->timer
);
829 ifibss
->timer_running
= false;
834 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data
*sdata
)
836 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
838 INIT_WORK(&ifibss
->work
, ieee80211_ibss_work
);
839 setup_timer(&ifibss
->timer
, ieee80211_ibss_timer
,
840 (unsigned long) sdata
);
841 skb_queue_head_init(&ifibss
->skb_queue
);
844 /* scan finished notification */
845 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local
*local
)
847 struct ieee80211_sub_if_data
*sdata
;
849 mutex_lock(&local
->iflist_mtx
);
850 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
851 if (!ieee80211_sdata_running(sdata
))
853 if (sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
855 if (!sdata
->u
.ibss
.ssid_len
)
857 sdata
->u
.ibss
.last_scan_completed
= jiffies
;
858 mod_timer(&sdata
->u
.ibss
.timer
, 0);
860 mutex_unlock(&local
->iflist_mtx
);
864 ieee80211_ibss_rx_mgmt(struct ieee80211_sub_if_data
*sdata
, struct sk_buff
*skb
)
866 struct ieee80211_local
*local
= sdata
->local
;
867 struct ieee80211_mgmt
*mgmt
;
871 return RX_DROP_MONITOR
;
873 mgmt
= (struct ieee80211_mgmt
*) skb
->data
;
874 fc
= le16_to_cpu(mgmt
->frame_control
);
876 switch (fc
& IEEE80211_FCTL_STYPE
) {
877 case IEEE80211_STYPE_PROBE_RESP
:
878 case IEEE80211_STYPE_BEACON
:
879 case IEEE80211_STYPE_PROBE_REQ
:
880 case IEEE80211_STYPE_AUTH
:
881 skb_queue_tail(&sdata
->u
.ibss
.skb_queue
, skb
);
882 ieee80211_queue_work(&local
->hw
, &sdata
->u
.ibss
.work
);
886 return RX_DROP_MONITOR
;
889 int ieee80211_ibss_join(struct ieee80211_sub_if_data
*sdata
,
890 struct cfg80211_ibss_params
*params
)
895 memcpy(sdata
->u
.ibss
.bssid
, params
->bssid
, ETH_ALEN
);
896 sdata
->u
.ibss
.fixed_bssid
= true;
898 sdata
->u
.ibss
.fixed_bssid
= false;
900 sdata
->u
.ibss
.privacy
= params
->privacy
;
902 sdata
->vif
.bss_conf
.beacon_int
= params
->beacon_interval
;
904 sdata
->u
.ibss
.channel
= params
->channel
;
905 sdata
->u
.ibss
.fixed_channel
= params
->channel_fixed
;
908 sdata
->u
.ibss
.ie
= kmemdup(params
->ie
, params
->ie_len
,
910 if (sdata
->u
.ibss
.ie
)
911 sdata
->u
.ibss
.ie_len
= params
->ie_len
;
914 skb
= dev_alloc_skb(sdata
->local
->hw
.extra_tx_headroom
+
918 4 /* IBSS params */ +
923 sdata
->u
.ibss
.skb
= skb
;
924 sdata
->u
.ibss
.state
= IEEE80211_IBSS_MLME_SEARCH
;
925 sdata
->u
.ibss
.ibss_join_req
= jiffies
;
927 memcpy(sdata
->u
.ibss
.ssid
, params
->ssid
, IEEE80211_MAX_SSID_LEN
);
930 * The ssid_len setting below is used to see whether
931 * we are active, and we need all other settings
932 * before that may get visible.
936 sdata
->u
.ibss
.ssid_len
= params
->ssid_len
;
938 ieee80211_recalc_idle(sdata
->local
);
940 set_bit(IEEE80211_IBSS_REQ_RUN
, &sdata
->u
.ibss
.request
);
941 ieee80211_queue_work(&sdata
->local
->hw
, &sdata
->u
.ibss
.work
);
946 int ieee80211_ibss_leave(struct ieee80211_sub_if_data
*sdata
)
950 del_timer_sync(&sdata
->u
.ibss
.timer
);
951 clear_bit(IEEE80211_IBSS_REQ_RUN
, &sdata
->u
.ibss
.request
);
952 cancel_work_sync(&sdata
->u
.ibss
.work
);
953 clear_bit(IEEE80211_IBSS_REQ_RUN
, &sdata
->u
.ibss
.request
);
955 sta_info_flush(sdata
->local
, sdata
);
958 kfree(sdata
->u
.ibss
.ie
);
959 skb
= sdata
->u
.ibss
.presp
;
960 rcu_assign_pointer(sdata
->u
.ibss
.presp
, NULL
);
961 sdata
->vif
.bss_conf
.ibss_joined
= false;
962 ieee80211_bss_info_change_notify(sdata
, BSS_CHANGED_BEACON_ENABLED
|
967 skb_queue_purge(&sdata
->u
.ibss
.skb_queue
);
968 memset(sdata
->u
.ibss
.bssid
, 0, ETH_ALEN
);
969 sdata
->u
.ibss
.ssid_len
= 0;
971 ieee80211_recalc_idle(sdata
->local
);