?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
serial: xilinx_uartps: fix bad register write in console_write
[linux-2.6-xlnx.git] / net / mac80211 / ibss.c
blob33d9d0c3e3d06ce70e831643473dc34ac201deed
1 /*
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>
9 *
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.
13 */
14
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
24 #include "ieee80211_i.h"
25 #include "driver-ops.h"
26 #include "rate.h"
27
28 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
29 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
30 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
31
32 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
33 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
34
35 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
36
37
38 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
39 const u8 *bssid, const int beacon_int,
40 struct ieee80211_channel *chan,
41 const u32 basic_rates,
42 const u16 capability, u64 tsf)
43 {
44 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
45 struct ieee80211_local *local = sdata->local;
46 int rates, i;
47 struct sk_buff *skb;
48 struct ieee80211_mgmt *mgmt;
49 u8 *pos;
50 struct ieee80211_supported_band *sband;
51 struct cfg80211_bss *bss;
52 u32 bss_change;
53 u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
54 enum nl80211_channel_type channel_type;
55
56 lockdep_assert_held(&ifibss->mtx);
57
58 /* Reset own TSF to allow time synchronization work. */
59 drv_reset_tsf(local, sdata);
60
61 skb = ifibss->skb;
62 RCU_INIT_POINTER(ifibss->presp, NULL);
63 synchronize_rcu();
64 skb->data = skb->head;
65 skb->len = 0;
66 skb_reset_tail_pointer(skb);
67 skb_reserve(skb, sdata->local->hw.extra_tx_headroom);
68
69 if (!ether_addr_equal(ifibss->bssid, bssid))
70 sta_info_flush(sdata->local, sdata);
71
72 /* if merging, indicate to driver that we leave the old IBSS */
73 if (sdata->vif.bss_conf.ibss_joined) {
74 sdata->vif.bss_conf.ibss_joined = false;
75 netif_carrier_off(sdata->dev);
76 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IBSS);
77 }
78
79 memcpy(ifibss->bssid, bssid, ETH_ALEN);
80
81 sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
82
83 local->oper_channel = chan;
84 channel_type = ifibss->channel_type;
85 if (channel_type > NL80211_CHAN_HT20 &&
86 !cfg80211_can_beacon_sec_chan(local->hw.wiphy, chan, channel_type))
87 channel_type = NL80211_CHAN_HT20;
88 if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
89 /* can only fail due to HT40+/- mismatch */
90 channel_type = NL80211_CHAN_HT20;
91 WARN_ON(!ieee80211_set_channel_type(local, sdata,
92 NL80211_CHAN_HT20));
93 }
94 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
95
96 sband = local->hw.wiphy->bands[chan->band];
97
98 /* build supported rates array */
99 pos = supp_rates;
100 for (i = 0; i < sband->n_bitrates; i++) {
101 int rate = sband->bitrates[i].bitrate;
102 u8 basic = 0;
103 if (basic_rates & BIT(i))
104 basic = 0x80;
105 *pos++ = basic | (u8) (rate / 5);
106 }
107
108 /* Build IBSS probe response */
109 mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon));
110 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
111 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
112 IEEE80211_STYPE_PROBE_RESP);
113 memset(mgmt->da, 0xff, ETH_ALEN);
114 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
115 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
116 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
117 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
118 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
119
120 pos = skb_put(skb, 2 + ifibss->ssid_len);
121 *pos++ = WLAN_EID_SSID;
122 *pos++ = ifibss->ssid_len;
123 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
124
125 rates = sband->n_bitrates;
126 if (rates > 8)
127 rates = 8;
128 pos = skb_put(skb, 2 + rates);
129 *pos++ = WLAN_EID_SUPP_RATES;
130 *pos++ = rates;
131 memcpy(pos, supp_rates, rates);
132
133 if (sband->band == IEEE80211_BAND_2GHZ) {
134 pos = skb_put(skb, 2 + 1);
135 *pos++ = WLAN_EID_DS_PARAMS;
136 *pos++ = 1;
137 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
138 }
139
140 pos = skb_put(skb, 2 + 2);
141 *pos++ = WLAN_EID_IBSS_PARAMS;
142 *pos++ = 2;
143 /* FIX: set ATIM window based on scan results */
144 *pos++ = 0;
145 *pos++ = 0;
146
147 if (sband->n_bitrates > 8) {
148 rates = sband->n_bitrates - 8;
149 pos = skb_put(skb, 2 + rates);
150 *pos++ = WLAN_EID_EXT_SUPP_RATES;
151 *pos++ = rates;
152 memcpy(pos, &supp_rates[8], rates);
153 }
154
155 if (ifibss->ie_len)
156 memcpy(skb_put(skb, ifibss->ie_len),
157 ifibss->ie, ifibss->ie_len);
158
159 /* add HT capability and information IEs */
160 if (channel_type && sband->ht_cap.ht_supported) {
161 pos = skb_put(skb, 4 +
162 sizeof(struct ieee80211_ht_cap) +
163 sizeof(struct ieee80211_ht_operation));
164 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
165 sband->ht_cap.cap);
166 /*
167 * Note: According to 802.11n-2009 9.13.3.1, HT Protection
168 * field and RIFS Mode are reserved in IBSS mode, therefore
169 * keep them at 0
170 */
171 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
172 chan, channel_type, 0);
173 }
174
175 if (local->hw.queues >= IEEE80211_NUM_ACS) {
176 pos = skb_put(skb, 9);
177 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
178 *pos++ = 7; /* len */
179 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
180 *pos++ = 0x50;
181 *pos++ = 0xf2;
182 *pos++ = 2; /* WME */
183 *pos++ = 0; /* WME info */
184 *pos++ = 1; /* WME ver */
185 *pos++ = 0; /* U-APSD no in use */
186 }
187
188 rcu_assign_pointer(ifibss->presp, skb);
189
190 sdata->vif.bss_conf.beacon_int = beacon_int;
191 sdata->vif.bss_conf.basic_rates = basic_rates;
192 bss_change = BSS_CHANGED_BEACON_INT;
193 bss_change |= ieee80211_reset_erp_info(sdata);
194 bss_change |= BSS_CHANGED_BSSID;
195 bss_change |= BSS_CHANGED_BEACON;
196 bss_change |= BSS_CHANGED_BEACON_ENABLED;
197 bss_change |= BSS_CHANGED_BASIC_RATES;
198 bss_change |= BSS_CHANGED_HT;
199 bss_change |= BSS_CHANGED_IBSS;
200 sdata->vif.bss_conf.ibss_joined = true;
201 ieee80211_bss_info_change_notify(sdata, bss_change);
202
203 ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates);
204
205 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
206 mod_timer(&ifibss->timer,
207 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
208
209 bss = cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel,
210 mgmt, skb->len, 0, GFP_KERNEL);
211 cfg80211_put_bss(bss);
212 netif_carrier_on(sdata->dev);
213 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
214 }
215
216 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
217 struct ieee80211_bss *bss)
218 {
219 struct cfg80211_bss *cbss =
220 container_of((void *)bss, struct cfg80211_bss, priv);
221 struct ieee80211_supported_band *sband;
222 u32 basic_rates;
223 int i, j;
224 u16 beacon_int = cbss->beacon_interval;
225
226 lockdep_assert_held(&sdata->u.ibss.mtx);
227
228 if (beacon_int < 10)
229 beacon_int = 10;
230
231 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
232
233 basic_rates = 0;
234
235 for (i = 0; i < bss->supp_rates_len; i++) {
236 int rate = (bss->supp_rates[i] & 0x7f) * 5;
237 bool is_basic = !!(bss->supp_rates[i] & 0x80);
238
239 for (j = 0; j < sband->n_bitrates; j++) {
240 if (sband->bitrates[j].bitrate == rate) {
241 if (is_basic)
242 basic_rates |= BIT(j);
243 break;
244 }
245 }
246 }
247
248 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
249 beacon_int,
250 cbss->channel,
251 basic_rates,
252 cbss->capability,
253 cbss->tsf);
254 }
255
256 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta,
257 bool auth)
258 __acquires(RCU)
259 {
260 struct ieee80211_sub_if_data *sdata = sta->sdata;
261 u8 addr[ETH_ALEN];
262
263 memcpy(addr, sta->sta.addr, ETH_ALEN);
264
265 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
266 wiphy_debug(sdata->local->hw.wiphy,
267 "Adding new IBSS station %pM (dev=%s)\n",
268 addr, sdata->name);
269 #endif
270
271 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
272 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
273 /* authorize the station only if the network is not RSN protected. If
274 * not wait for the userspace to authorize it */
275 if (!sta->sdata->u.ibss.control_port)
276 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
277
278 rate_control_rate_init(sta);
279
280 /* If it fails, maybe we raced another insertion? */
281 if (sta_info_insert_rcu(sta))
282 return sta_info_get(sdata, addr);
283 if (auth) {
284 #ifdef CONFIG_MAC80211_IBSS_DEBUG
285 printk(KERN_DEBUG "TX Auth SA=%pM DA=%pM BSSID=%pM"
286 "(auth_transaction=1)\n", sdata->vif.addr,
287 sdata->u.ibss.bssid, addr);
288 #endif
289 ieee80211_send_auth(sdata, 1, WLAN_AUTH_OPEN, NULL, 0,
290 addr, sdata->u.ibss.bssid, NULL, 0, 0);
291 }
292 return sta;
293 }
294
295 static struct sta_info *
296 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
297 const u8 *bssid, const u8 *addr,
298 u32 supp_rates, bool auth)
299 __acquires(RCU)
300 {
301 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
302 struct ieee80211_local *local = sdata->local;
303 struct sta_info *sta;
304 int band = local->hw.conf.channel->band;
305
306 /*
307 * XXX: Consider removing the least recently used entry and
308 * allow new one to be added.
309 */
310 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
311 net_dbg_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
312 sdata->name, addr);
313 rcu_read_lock();
314 return NULL;
315 }
316
317 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
318 rcu_read_lock();
319 return NULL;
320 }
321
322 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
323 rcu_read_lock();
324 return NULL;
325 }
326
327 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
328 if (!sta) {
329 rcu_read_lock();
330 return NULL;
331 }
332
333 sta->last_rx = jiffies;
334
335 /* make sure mandatory rates are always added */
336 sta->sta.supp_rates[band] = supp_rates |
337 ieee80211_mandatory_rates(local, band);
338
339 return ieee80211_ibss_finish_sta(sta, auth);
340 }
341
342 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
343 struct ieee80211_mgmt *mgmt,
344 size_t len)
345 {
346 u16 auth_alg, auth_transaction;
347
348 lockdep_assert_held(&sdata->u.ibss.mtx);
349
350 if (len < 24 + 6)
351 return;
352
353 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
354 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
355
356 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
357 return;
358 #ifdef CONFIG_MAC80211_IBSS_DEBUG
359 printk(KERN_DEBUG "%s: RX Auth SA=%pM DA=%pM BSSID=%pM."
360 "(auth_transaction=%d)\n",
361 sdata->name, mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
362 #endif
363 sta_info_destroy_addr(sdata, mgmt->sa);
364 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 0, false);
365 rcu_read_unlock();
366
367 /*
368 * IEEE 802.11 standard does not require authentication in IBSS
369 * networks and most implementations do not seem to use it.
370 * However, try to reply to authentication attempts if someone
371 * has actually implemented this.
372 */
373 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, NULL, 0,
374 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0);
375 }
376
377 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
378 struct ieee80211_mgmt *mgmt,
379 size_t len,
380 struct ieee80211_rx_status *rx_status,
381 struct ieee802_11_elems *elems,
382 bool beacon)
383 {
384 struct ieee80211_local *local = sdata->local;
385 int freq;
386 struct cfg80211_bss *cbss;
387 struct ieee80211_bss *bss;
388 struct sta_info *sta;
389 struct ieee80211_channel *channel;
390 u64 beacon_timestamp, rx_timestamp;
391 u32 supp_rates = 0;
392 enum ieee80211_band band = rx_status->band;
393 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
394 bool rates_updated = false;
395
396 if (elems->ds_params && elems->ds_params_len == 1)
397 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
398 band);
399 else
400 freq = rx_status->freq;
401
402 channel = ieee80211_get_channel(local->hw.wiphy, freq);
403
404 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
405 return;
406
407 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
408 ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) {
409
410 rcu_read_lock();
411 sta = sta_info_get(sdata, mgmt->sa);
412
413 if (elems->supp_rates) {
414 supp_rates = ieee80211_sta_get_rates(local, elems,
415 band, NULL);
416 if (sta) {
417 u32 prev_rates;
418
419 prev_rates = sta->sta.supp_rates[band];
420 /* make sure mandatory rates are always added */
421 sta->sta.supp_rates[band] = supp_rates |
422 ieee80211_mandatory_rates(local, band);
423
424 if (sta->sta.supp_rates[band] != prev_rates) {
425 #ifdef CONFIG_MAC80211_IBSS_DEBUG
426 printk(KERN_DEBUG
427 "%s: updated supp_rates set "
428 "for %pM based on beacon"
429 "/probe_resp (0x%x -> 0x%x)\n",
430 sdata->name, sta->sta.addr,
431 prev_rates,
432 sta->sta.supp_rates[band]);
433 #endif
434 rates_updated = true;
435 }
436 } else {
437 rcu_read_unlock();
438 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
439 mgmt->sa, supp_rates, true);
440 }
441 }
442
443 if (sta && elems->wmm_info)
444 set_sta_flag(sta, WLAN_STA_WME);
445
446 if (sta && elems->ht_operation && elems->ht_cap_elem &&
447 sdata->u.ibss.channel_type != NL80211_CHAN_NO_HT) {
448 /* we both use HT */
449 struct ieee80211_sta_ht_cap sta_ht_cap_new;
450 enum nl80211_channel_type channel_type =
451 ieee80211_ht_oper_to_channel_type(
452 elems->ht_operation);
453
454 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
455 elems->ht_cap_elem,
456 &sta_ht_cap_new);
457
458 /*
459 * fall back to HT20 if we don't use or use
460 * the other extension channel
461 */
462 if (!(channel_type == NL80211_CHAN_HT40MINUS ||
463 channel_type == NL80211_CHAN_HT40PLUS) ||
464 channel_type != sdata->u.ibss.channel_type)
465 sta_ht_cap_new.cap &=
466 ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
467
468 if (memcmp(&sta->sta.ht_cap, &sta_ht_cap_new,
469 sizeof(sta_ht_cap_new))) {
470 memcpy(&sta->sta.ht_cap, &sta_ht_cap_new,
471 sizeof(sta_ht_cap_new));
472 rates_updated = true;
473 }
474 }
475
476 if (sta && rates_updated)
477 rate_control_rate_init(sta);
478
479 rcu_read_unlock();
480 }
481
482 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
483 channel, beacon);
484 if (!bss)
485 return;
486
487 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
488
489 /* was just updated in ieee80211_bss_info_update */
490 beacon_timestamp = cbss->tsf;
491
492 /* check if we need to merge IBSS */
493
494 /* we use a fixed BSSID */
495 if (sdata->u.ibss.fixed_bssid)
496 goto put_bss;
497
498 /* not an IBSS */
499 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
500 goto put_bss;
501
502 /* different channel */
503 if (cbss->channel != local->oper_channel)
504 goto put_bss;
505
506 /* different SSID */
507 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
508 memcmp(elems->ssid, sdata->u.ibss.ssid,
509 sdata->u.ibss.ssid_len))
510 goto put_bss;
511
512 /* same BSSID */
513 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
514 goto put_bss;
515
516 if (rx_status->flag & RX_FLAG_MACTIME_MPDU) {
517 /*
518 * For correct IBSS merging we need mactime; since mactime is
519 * defined as the time the first data symbol of the frame hits
520 * the PHY, and the timestamp of the beacon is defined as "the
521 * time that the data symbol containing the first bit of the
522 * timestamp is transmitted to the PHY plus the transmitting
523 * STA's delays through its local PHY from the MAC-PHY
524 * interface to its interface with the WM" (802.11 11.1.2)
525 * - equals the time this bit arrives at the receiver - we have
526 * to take into account the offset between the two.
527 *
528 * E.g. at 1 MBit that means mactime is 192 usec earlier
529 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
530 */
531 int rate;
532
533 if (rx_status->flag & RX_FLAG_HT)
534 rate = 65; /* TODO: HT rates */
535 else
536 rate = local->hw.wiphy->bands[band]->
537 bitrates[rx_status->rate_idx].bitrate;
538
539 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
540 } else {
541 /*
542 * second best option: get current TSF
543 * (will return -1 if not supported)
544 */
545 rx_timestamp = drv_get_tsf(local, sdata);
546 }
547
548 #ifdef CONFIG_MAC80211_IBSS_DEBUG
549 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
550 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
551 mgmt->sa, mgmt->bssid,
552 (unsigned long long)rx_timestamp,
553 (unsigned long long)beacon_timestamp,
554 (unsigned long long)(rx_timestamp - beacon_timestamp),
555 jiffies);
556 #endif
557
558 if (beacon_timestamp > rx_timestamp) {
559 #ifdef CONFIG_MAC80211_IBSS_DEBUG
560 printk(KERN_DEBUG "%s: beacon TSF higher than "
561 "local TSF - IBSS merge with BSSID %pM\n",
562 sdata->name, mgmt->bssid);
563 #endif
564 ieee80211_sta_join_ibss(sdata, bss);
565 supp_rates = ieee80211_sta_get_rates(local, elems, band, NULL);
566 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
567 supp_rates, true);
568 rcu_read_unlock();
569 }
570
571 put_bss:
572 ieee80211_rx_bss_put(local, bss);
573 }
574
575 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
576 const u8 *bssid, const u8 *addr,
577 u32 supp_rates)
578 {
579 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
580 struct ieee80211_local *local = sdata->local;
581 struct sta_info *sta;
582 int band = local->hw.conf.channel->band;
583
584 /*
585 * XXX: Consider removing the least recently used entry and
586 * allow new one to be added.
587 */
588 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
589 net_dbg_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
590 sdata->name, addr);
591 return;
592 }
593
594 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
595 return;
596
597 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
598 return;
599
600 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
601 if (!sta)
602 return;
603
604 sta->last_rx = jiffies;
605
606 /* make sure mandatory rates are always added */
607 sta->sta.supp_rates[band] = supp_rates |
608 ieee80211_mandatory_rates(local, band);
609
610 spin_lock(&ifibss->incomplete_lock);
611 list_add(&sta->list, &ifibss->incomplete_stations);
612 spin_unlock(&ifibss->incomplete_lock);
613 ieee80211_queue_work(&local->hw, &sdata->work);
614 }
615
616 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
617 {
618 struct ieee80211_local *local = sdata->local;
619 int active = 0;
620 struct sta_info *sta;
621
622 lockdep_assert_held(&sdata->u.ibss.mtx);
623
624 rcu_read_lock();
625
626 list_for_each_entry_rcu(sta, &local->sta_list, list) {
627 if (sta->sdata == sdata &&
628 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
629 jiffies)) {
630 active++;
631 break;
632 }
633 }
634
635 rcu_read_unlock();
636
637 return active;
638 }
639
640 /*
641 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
642 */
643
644 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
645 {
646 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
647
648 lockdep_assert_held(&ifibss->mtx);
649
650 mod_timer(&ifibss->timer,
651 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
652
653 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
654
655 if (time_before(jiffies, ifibss->last_scan_completed +
656 IEEE80211_IBSS_MERGE_INTERVAL))
657 return;
658
659 if (ieee80211_sta_active_ibss(sdata))
660 return;
661
662 if (ifibss->fixed_channel)
663 return;
664
665 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
666 "IBSS networks with same SSID (merge)\n", sdata->name);
667
668 ieee80211_request_internal_scan(sdata,
669 ifibss->ssid, ifibss->ssid_len, NULL);
670 }
671
672 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
673 {
674 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
675 u8 bssid[ETH_ALEN];
676 u16 capability;
677 int i;
678
679 lockdep_assert_held(&ifibss->mtx);
680
681 if (ifibss->fixed_bssid) {
682 memcpy(bssid, ifibss->bssid, ETH_ALEN);
683 } else {
684 /* Generate random, not broadcast, locally administered BSSID. Mix in
685 * own MAC address to make sure that devices that do not have proper
686 * random number generator get different BSSID. */
687 get_random_bytes(bssid, ETH_ALEN);
688 for (i = 0; i < ETH_ALEN; i++)
689 bssid[i] ^= sdata->vif.addr[i];
690 bssid[0] &= ~0x01;
691 bssid[0] |= 0x02;
692 }
693
694 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
695 sdata->name, bssid);
696
697 capability = WLAN_CAPABILITY_IBSS;
698
699 if (ifibss->privacy)
700 capability |= WLAN_CAPABILITY_PRIVACY;
701 else
702 sdata->drop_unencrypted = 0;
703
704 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
705 ifibss->channel, ifibss->basic_rates,
706 capability, 0);
707 }
708
709 /*
710 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
711 */
712
713 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
714 {
715 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
716 struct ieee80211_local *local = sdata->local;
717 struct cfg80211_bss *cbss;
718 struct ieee80211_channel *chan = NULL;
719 const u8 *bssid = NULL;
720 int active_ibss;
721 u16 capability;
722
723 lockdep_assert_held(&ifibss->mtx);
724
725 active_ibss = ieee80211_sta_active_ibss(sdata);
726 #ifdef CONFIG_MAC80211_IBSS_DEBUG
727 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
728 sdata->name, active_ibss);
729 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
730
731 if (active_ibss)
732 return;
733
734 capability = WLAN_CAPABILITY_IBSS;
735 if (ifibss->privacy)
736 capability |= WLAN_CAPABILITY_PRIVACY;
737 if (ifibss->fixed_bssid)
738 bssid = ifibss->bssid;
739 if (ifibss->fixed_channel)
740 chan = ifibss->channel;
741 if (!is_zero_ether_addr(ifibss->bssid))
742 bssid = ifibss->bssid;
743 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
744 ifibss->ssid, ifibss->ssid_len,
745 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
746 capability);
747
748 if (cbss) {
749 struct ieee80211_bss *bss;
750
751 bss = (void *)cbss->priv;
752 #ifdef CONFIG_MAC80211_IBSS_DEBUG
753 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
754 "%pM\n", cbss->bssid, ifibss->bssid);
755 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
756
757 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
758 " based on configured SSID\n",
759 sdata->name, cbss->bssid);
760
761 ieee80211_sta_join_ibss(sdata, bss);
762 ieee80211_rx_bss_put(local, bss);
763 return;
764 }
765
766 #ifdef CONFIG_MAC80211_IBSS_DEBUG
767 printk(KERN_DEBUG " did not try to join ibss\n");
768 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
769
770 /* Selected IBSS not found in current scan results - try to scan */
771 if (time_after(jiffies, ifibss->last_scan_completed +
772 IEEE80211_SCAN_INTERVAL)) {
773 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
774 "join\n", sdata->name);
775
776 ieee80211_request_internal_scan(sdata,
777 ifibss->ssid, ifibss->ssid_len,
778 ifibss->fixed_channel ? ifibss->channel : NULL);
779 } else {
780 int interval = IEEE80211_SCAN_INTERVAL;
781
782 if (time_after(jiffies, ifibss->ibss_join_req +
783 IEEE80211_IBSS_JOIN_TIMEOUT)) {
784 if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) {
785 ieee80211_sta_create_ibss(sdata);
786 return;
787 }
788 printk(KERN_DEBUG "%s: IBSS not allowed on"
789 " %d MHz\n", sdata->name,
790 local->hw.conf.channel->center_freq);
791
792 /* No IBSS found - decrease scan interval and continue
793 * scanning. */
794 interval = IEEE80211_SCAN_INTERVAL_SLOW;
795 }
796
797 mod_timer(&ifibss->timer,
798 round_jiffies(jiffies + interval));
799 }
800 }
801
802 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
803 struct sk_buff *req)
804 {
805 struct ieee80211_mgmt *mgmt = (void *)req->data;
806 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
807 struct ieee80211_local *local = sdata->local;
808 int tx_last_beacon, len = req->len;
809 struct sk_buff *skb;
810 struct ieee80211_mgmt *resp;
811 struct sk_buff *presp;
812 u8 *pos, *end;
813
814 lockdep_assert_held(&ifibss->mtx);
815
816 presp = rcu_dereference_protected(ifibss->presp,
817 lockdep_is_held(&ifibss->mtx));
818
819 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
820 len < 24 + 2 || !presp)
821 return;
822
823 tx_last_beacon = drv_tx_last_beacon(local);
824
825 #ifdef CONFIG_MAC80211_IBSS_DEBUG
826 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
827 " (tx_last_beacon=%d)\n",
828 sdata->name, mgmt->sa, mgmt->da,
829 mgmt->bssid, tx_last_beacon);
830 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
831
832 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
833 return;
834
835 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
836 !is_broadcast_ether_addr(mgmt->bssid))
837 return;
838
839 end = ((u8 *) mgmt) + len;
840 pos = mgmt->u.probe_req.variable;
841 if (pos[0] != WLAN_EID_SSID ||
842 pos + 2 + pos[1] > end) {
843 #ifdef CONFIG_MAC80211_IBSS_DEBUG
844 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
845 "from %pM\n",
846 sdata->name, mgmt->sa);
847 #endif
848 return;
849 }
850 if (pos[1] != 0 &&
851 (pos[1] != ifibss->ssid_len ||
852 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
853 /* Ignore ProbeReq for foreign SSID */
854 return;
855 }
856
857 /* Reply with ProbeResp */
858 skb = skb_copy(presp, GFP_KERNEL);
859 if (!skb)
860 return;
861
862 resp = (struct ieee80211_mgmt *) skb->data;
863 memcpy(resp->da, mgmt->sa, ETH_ALEN);
864 #ifdef CONFIG_MAC80211_IBSS_DEBUG
865 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
866 sdata->name, resp->da);
867 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
868 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
869 ieee80211_tx_skb(sdata, skb);
870 }
871
872 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
873 struct ieee80211_mgmt *mgmt,
874 size_t len,
875 struct ieee80211_rx_status *rx_status)
876 {
877 size_t baselen;
878 struct ieee802_11_elems elems;
879
880 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
881 if (baselen > len)
882 return;
883
884 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
885 &elems);
886
887 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
888 }
889
890 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
891 struct ieee80211_mgmt *mgmt,
892 size_t len,
893 struct ieee80211_rx_status *rx_status)
894 {
895 size_t baselen;
896 struct ieee802_11_elems elems;
897
898 /* Process beacon from the current BSS */
899 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
900 if (baselen > len)
901 return;
902
903 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
904
905 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
906 }
907
908 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
909 struct sk_buff *skb)
910 {
911 struct ieee80211_rx_status *rx_status;
912 struct ieee80211_mgmt *mgmt;
913 u16 fc;
914
915 rx_status = IEEE80211_SKB_RXCB(skb);
916 mgmt = (struct ieee80211_mgmt *) skb->data;
917 fc = le16_to_cpu(mgmt->frame_control);
918
919 mutex_lock(&sdata->u.ibss.mtx);
920
921 if (!sdata->u.ibss.ssid_len)
922 goto mgmt_out; /* not ready to merge yet */
923
924 switch (fc & IEEE80211_FCTL_STYPE) {
925 case IEEE80211_STYPE_PROBE_REQ:
926 ieee80211_rx_mgmt_probe_req(sdata, skb);
927 break;
928 case IEEE80211_STYPE_PROBE_RESP:
929 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
930 rx_status);
931 break;
932 case IEEE80211_STYPE_BEACON:
933 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
934 rx_status);
935 break;
936 case IEEE80211_STYPE_AUTH:
937 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
938 break;
939 }
940
941 mgmt_out:
942 mutex_unlock(&sdata->u.ibss.mtx);
943 }
944
945 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
946 {
947 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
948 struct sta_info *sta;
949
950 mutex_lock(&ifibss->mtx);
951
952 /*
953 * Work could be scheduled after scan or similar
954 * when we aren't even joined (or trying) with a
955 * network.
956 */
957 if (!ifibss->ssid_len)
958 goto out;
959
960 spin_lock_bh(&ifibss->incomplete_lock);
961 while (!list_empty(&ifibss->incomplete_stations)) {
962 sta = list_first_entry(&ifibss->incomplete_stations,
963 struct sta_info, list);
964 list_del(&sta->list);
965 spin_unlock_bh(&ifibss->incomplete_lock);
966
967 ieee80211_ibss_finish_sta(sta, true);
968 rcu_read_unlock();
969 spin_lock_bh(&ifibss->incomplete_lock);
970 }
971 spin_unlock_bh(&ifibss->incomplete_lock);
972
973 switch (ifibss->state) {
974 case IEEE80211_IBSS_MLME_SEARCH:
975 ieee80211_sta_find_ibss(sdata);
976 break;
977 case IEEE80211_IBSS_MLME_JOINED:
978 ieee80211_sta_merge_ibss(sdata);
979 break;
980 default:
981 WARN_ON(1);
982 break;
983 }
984
985 out:
986 mutex_unlock(&ifibss->mtx);
987 }
988
989 static void ieee80211_ibss_timer(unsigned long data)
990 {
991 struct ieee80211_sub_if_data *sdata =
992 (struct ieee80211_sub_if_data *) data;
993 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
994 struct ieee80211_local *local = sdata->local;
995
996 if (local->quiescing) {
997 ifibss->timer_running = true;
998 return;
999 }
1000
1001 ieee80211_queue_work(&local->hw, &sdata->work);
1002 }
1003
1004 #ifdef CONFIG_PM
1005 void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata)
1006 {
1007 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1008
1009 if (del_timer_sync(&ifibss->timer))
1010 ifibss->timer_running = true;
1011 }
1012
1013 void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata)
1014 {
1015 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1016
1017 if (ifibss->timer_running) {
1018 add_timer(&ifibss->timer);
1019 ifibss->timer_running = false;
1020 }
1021 }
1022 #endif
1023
1024 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1025 {
1026 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1027
1028 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1029 (unsigned long) sdata);
1030 mutex_init(&ifibss->mtx);
1031 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1032 spin_lock_init(&ifibss->incomplete_lock);
1033 }
1034
1035 /* scan finished notification */
1036 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1037 {
1038 struct ieee80211_sub_if_data *sdata;
1039
1040 mutex_lock(&local->iflist_mtx);
1041 list_for_each_entry(sdata, &local->interfaces, list) {
1042 if (!ieee80211_sdata_running(sdata))
1043 continue;
1044 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1045 continue;
1046 sdata->u.ibss.last_scan_completed = jiffies;
1047 ieee80211_queue_work(&local->hw, &sdata->work);
1048 }
1049 mutex_unlock(&local->iflist_mtx);
1050 }
1051
1052 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1053 struct cfg80211_ibss_params *params)
1054 {
1055 struct sk_buff *skb;
1056 u32 changed = 0;
1057
1058 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom +
1059 sizeof(struct ieee80211_hdr_3addr) +
1060 12 /* struct ieee80211_mgmt.u.beacon */ +
1061 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
1062 2 + 8 /* max Supported Rates */ +
1063 3 /* max DS params */ +
1064 4 /* IBSS params */ +
1065 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
1066 2 + sizeof(struct ieee80211_ht_cap) +
1067 2 + sizeof(struct ieee80211_ht_operation) +
1068 params->ie_len);
1069 if (!skb)
1070 return -ENOMEM;
1071
1072 mutex_lock(&sdata->u.ibss.mtx);
1073
1074 if (params->bssid) {
1075 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1076 sdata->u.ibss.fixed_bssid = true;
1077 } else
1078 sdata->u.ibss.fixed_bssid = false;
1079
1080 sdata->u.ibss.privacy = params->privacy;
1081 sdata->u.ibss.control_port = params->control_port;
1082 sdata->u.ibss.basic_rates = params->basic_rates;
1083 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1084 sizeof(params->mcast_rate));
1085
1086 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1087
1088 sdata->u.ibss.channel = params->channel;
1089 sdata->u.ibss.channel_type = params->channel_type;
1090 sdata->u.ibss.fixed_channel = params->channel_fixed;
1091
1092 /* fix ourselves to that channel now already */
1093 if (params->channel_fixed) {
1094 sdata->local->oper_channel = params->channel;
1095 if (!ieee80211_set_channel_type(sdata->local, sdata,
1096 params->channel_type)) {
1097 mutex_unlock(&sdata->u.ibss.mtx);
1098 kfree_skb(skb);
1099 return -EINVAL;
1100 }
1101 }
1102
1103 if (params->ie) {
1104 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1105 GFP_KERNEL);
1106 if (sdata->u.ibss.ie)
1107 sdata->u.ibss.ie_len = params->ie_len;
1108 }
1109
1110 sdata->u.ibss.skb = skb;
1111 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1112 sdata->u.ibss.ibss_join_req = jiffies;
1113
1114 memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN);
1115 sdata->u.ibss.ssid_len = params->ssid_len;
1116
1117 mutex_unlock(&sdata->u.ibss.mtx);
1118
1119 mutex_lock(&sdata->local->mtx);
1120 ieee80211_recalc_idle(sdata->local);
1121 mutex_unlock(&sdata->local->mtx);
1122
1123 /*
1124 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1125 * reserved, but an HT STA shall protect HT transmissions as though
1126 * the HT Protection field were set to non-HT mixed mode.
1127 *
1128 * In an IBSS, the RIFS Mode field of the HT Operation element is
1129 * also reserved, but an HT STA shall operate as though this field
1130 * were set to 1.
1131 */
1132
1133 sdata->vif.bss_conf.ht_operation_mode |=
1134 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1135 | IEEE80211_HT_PARAM_RIFS_MODE;
1136
1137 changed |= BSS_CHANGED_HT;
1138 ieee80211_bss_info_change_notify(sdata, changed);
1139
1140 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1141
1142 return 0;
1143 }
1144
1145 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1146 {
1147 struct sk_buff *skb;
1148 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1149 struct ieee80211_local *local = sdata->local;
1150 struct cfg80211_bss *cbss;
1151 u16 capability;
1152 int active_ibss;
1153 struct sta_info *sta;
1154
1155 mutex_lock(&sdata->u.ibss.mtx);
1156
1157 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1158 memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
1159 sdata->u.ibss.ssid_len = 0;
1160
1161 active_ibss = ieee80211_sta_active_ibss(sdata);
1162
1163 if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) {
1164 capability = WLAN_CAPABILITY_IBSS;
1165
1166 if (ifibss->privacy)
1167 capability |= WLAN_CAPABILITY_PRIVACY;
1168
1169 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->channel,
1170 ifibss->bssid, ifibss->ssid,
1171 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
1172 WLAN_CAPABILITY_PRIVACY,
1173 capability);
1174
1175 if (cbss) {
1176 cfg80211_unlink_bss(local->hw.wiphy, cbss);
1177 cfg80211_put_bss(cbss);
1178 }
1179 }
1180
1181 sta_info_flush(sdata->local, sdata);
1182
1183 spin_lock_bh(&ifibss->incomplete_lock);
1184 while (!list_empty(&ifibss->incomplete_stations)) {
1185 sta = list_first_entry(&ifibss->incomplete_stations,
1186 struct sta_info, list);
1187 list_del(&sta->list);
1188 spin_unlock_bh(&ifibss->incomplete_lock);
1189
1190 sta_info_free(local, sta);
1191 spin_lock_bh(&ifibss->incomplete_lock);
1192 }
1193 spin_unlock_bh(&ifibss->incomplete_lock);
1194
1195 netif_carrier_off(sdata->dev);
1196
1197 /* remove beacon */
1198 kfree(sdata->u.ibss.ie);
1199 skb = rcu_dereference_protected(sdata->u.ibss.presp,
1200 lockdep_is_held(&sdata->u.ibss.mtx));
1201 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
1202 sdata->vif.bss_conf.ibss_joined = false;
1203 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
1204 BSS_CHANGED_IBSS);
1205 synchronize_rcu();
1206 kfree_skb(skb);
1207
1208 skb_queue_purge(&sdata->skb_queue);
1209
1210 del_timer_sync(&sdata->u.ibss.timer);
1211
1212 mutex_unlock(&sdata->u.ibss.mtx);
1213
1214 mutex_lock(&local->mtx);
1215 ieee80211_recalc_idle(sdata->local);
1216 mutex_unlock(&local->mtx);
1217
1218 return 0;
1219 }