Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab...
[platform/adaptation/renesas_rcar/renesas_kernel.git] / net / mac80211 / ibss.c
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 (compare_ether_addr(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_info));
164                 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
165                                                 sband->ht_cap.cap);
166                 pos = ieee80211_ie_build_ht_info(pos,
167                                                  &sband->ht_cap,
168                                                  chan,
169                                                  channel_type);
170         }
171
172         if (local->hw.queues >= 4) {
173                 pos = skb_put(skb, 9);
174                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
175                 *pos++ = 7; /* len */
176                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
177                 *pos++ = 0x50;
178                 *pos++ = 0xf2;
179                 *pos++ = 2; /* WME */
180                 *pos++ = 0; /* WME info */
181                 *pos++ = 1; /* WME ver */
182                 *pos++ = 0; /* U-APSD no in use */
183         }
184
185         rcu_assign_pointer(ifibss->presp, skb);
186
187         sdata->vif.bss_conf.beacon_int = beacon_int;
188         sdata->vif.bss_conf.basic_rates = basic_rates;
189         bss_change = BSS_CHANGED_BEACON_INT;
190         bss_change |= ieee80211_reset_erp_info(sdata);
191         bss_change |= BSS_CHANGED_BSSID;
192         bss_change |= BSS_CHANGED_BEACON;
193         bss_change |= BSS_CHANGED_BEACON_ENABLED;
194         bss_change |= BSS_CHANGED_BASIC_RATES;
195         bss_change |= BSS_CHANGED_HT;
196         bss_change |= BSS_CHANGED_IBSS;
197         sdata->vif.bss_conf.ibss_joined = true;
198         ieee80211_bss_info_change_notify(sdata, bss_change);
199
200         ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates);
201
202         ifibss->state = IEEE80211_IBSS_MLME_JOINED;
203         mod_timer(&ifibss->timer,
204                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
205
206         bss = cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel,
207                                         mgmt, skb->len, 0, GFP_KERNEL);
208         cfg80211_put_bss(bss);
209         netif_carrier_on(sdata->dev);
210         cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
211 }
212
213 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
214                                     struct ieee80211_bss *bss)
215 {
216         struct cfg80211_bss *cbss =
217                 container_of((void *)bss, struct cfg80211_bss, priv);
218         struct ieee80211_supported_band *sband;
219         u32 basic_rates;
220         int i, j;
221         u16 beacon_int = cbss->beacon_interval;
222
223         lockdep_assert_held(&sdata->u.ibss.mtx);
224
225         if (beacon_int < 10)
226                 beacon_int = 10;
227
228         sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
229
230         basic_rates = 0;
231
232         for (i = 0; i < bss->supp_rates_len; i++) {
233                 int rate = (bss->supp_rates[i] & 0x7f) * 5;
234                 bool is_basic = !!(bss->supp_rates[i] & 0x80);
235
236                 for (j = 0; j < sband->n_bitrates; j++) {
237                         if (sband->bitrates[j].bitrate == rate) {
238                                 if (is_basic)
239                                         basic_rates |= BIT(j);
240                                 break;
241                         }
242                 }
243         }
244
245         __ieee80211_sta_join_ibss(sdata, cbss->bssid,
246                                   beacon_int,
247                                   cbss->channel,
248                                   basic_rates,
249                                   cbss->capability,
250                                   cbss->tsf);
251 }
252
253 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta,
254                                                   bool auth)
255         __acquires(RCU)
256 {
257         struct ieee80211_sub_if_data *sdata = sta->sdata;
258         u8 addr[ETH_ALEN];
259
260         memcpy(addr, sta->sta.addr, ETH_ALEN);
261
262 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
263         wiphy_debug(sdata->local->hw.wiphy,
264                     "Adding new IBSS station %pM (dev=%s)\n",
265                     addr, sdata->name);
266 #endif
267
268         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
269         sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
270         /* authorize the station only if the network is not RSN protected. If
271          * not wait for the userspace to authorize it */
272         if (!sta->sdata->u.ibss.control_port)
273                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
274
275         rate_control_rate_init(sta);
276
277         /* If it fails, maybe we raced another insertion? */
278         if (sta_info_insert_rcu(sta))
279                 return sta_info_get(sdata, addr);
280         if (auth) {
281 #ifdef CONFIG_MAC80211_IBSS_DEBUG
282                 printk(KERN_DEBUG "TX Auth SA=%pM DA=%pM BSSID=%pM"
283                        "(auth_transaction=1)\n", sdata->vif.addr,
284                        sdata->u.ibss.bssid, addr);
285 #endif
286                 ieee80211_send_auth(sdata, 1, WLAN_AUTH_OPEN, NULL, 0,
287                                     addr, sdata->u.ibss.bssid, NULL, 0, 0);
288         }
289         return sta;
290 }
291
292 static struct sta_info *
293 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
294                        const u8 *bssid, const u8 *addr,
295                        u32 supp_rates, bool auth)
296         __acquires(RCU)
297 {
298         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
299         struct ieee80211_local *local = sdata->local;
300         struct sta_info *sta;
301         int band = local->hw.conf.channel->band;
302
303         /*
304          * XXX: Consider removing the least recently used entry and
305          *      allow new one to be added.
306          */
307         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
308                 if (net_ratelimit())
309                         printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n",
310                                sdata->name, addr);
311                 rcu_read_lock();
312                 return NULL;
313         }
314
315         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
316                 rcu_read_lock();
317                 return NULL;
318         }
319
320         if (compare_ether_addr(bssid, sdata->u.ibss.bssid)) {
321                 rcu_read_lock();
322                 return NULL;
323         }
324
325         sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
326         if (!sta) {
327                 rcu_read_lock();
328                 return NULL;
329         }
330
331         sta->last_rx = jiffies;
332
333         /* make sure mandatory rates are always added */
334         sta->sta.supp_rates[band] = supp_rates |
335                         ieee80211_mandatory_rates(local, band);
336
337         return ieee80211_ibss_finish_sta(sta, auth);
338 }
339
340 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
341                                         struct ieee80211_mgmt *mgmt,
342                                         size_t len)
343 {
344         u16 auth_alg, auth_transaction;
345
346         lockdep_assert_held(&sdata->u.ibss.mtx);
347
348         if (len < 24 + 6)
349                 return;
350
351         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
352         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
353
354         if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
355                 return;
356 #ifdef CONFIG_MAC80211_IBSS_DEBUG
357         printk(KERN_DEBUG "%s: RX Auth SA=%pM DA=%pM BSSID=%pM."
358                "(auth_transaction=%d)\n",
359                sdata->name, mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
360 #endif
361         sta_info_destroy_addr(sdata, mgmt->sa);
362         ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 0, false);
363         rcu_read_unlock();
364
365         /*
366          * IEEE 802.11 standard does not require authentication in IBSS
367          * networks and most implementations do not seem to use it.
368          * However, try to reply to authentication attempts if someone
369          * has actually implemented this.
370          */
371         ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, NULL, 0,
372                             mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0);
373 }
374
375 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
376                                   struct ieee80211_mgmt *mgmt,
377                                   size_t len,
378                                   struct ieee80211_rx_status *rx_status,
379                                   struct ieee802_11_elems *elems,
380                                   bool beacon)
381 {
382         struct ieee80211_local *local = sdata->local;
383         int freq;
384         struct cfg80211_bss *cbss;
385         struct ieee80211_bss *bss;
386         struct sta_info *sta;
387         struct ieee80211_channel *channel;
388         u64 beacon_timestamp, rx_timestamp;
389         u32 supp_rates = 0;
390         enum ieee80211_band band = rx_status->band;
391         struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
392         bool rates_updated = false;
393
394         if (elems->ds_params && elems->ds_params_len == 1)
395                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
396                                                       band);
397         else
398                 freq = rx_status->freq;
399
400         channel = ieee80211_get_channel(local->hw.wiphy, freq);
401
402         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
403                 return;
404
405         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
406             compare_ether_addr(mgmt->bssid, sdata->u.ibss.bssid) == 0) {
407
408                 rcu_read_lock();
409                 sta = sta_info_get(sdata, mgmt->sa);
410
411                 if (elems->supp_rates) {
412                         supp_rates = ieee80211_sta_get_rates(local, elems,
413                                                              band);
414                         if (sta) {
415                                 u32 prev_rates;
416
417                                 prev_rates = sta->sta.supp_rates[band];
418                                 /* make sure mandatory rates are always added */
419                                 sta->sta.supp_rates[band] = supp_rates |
420                                         ieee80211_mandatory_rates(local, band);
421
422                                 if (sta->sta.supp_rates[band] != prev_rates) {
423 #ifdef CONFIG_MAC80211_IBSS_DEBUG
424                                         printk(KERN_DEBUG
425                                                 "%s: updated supp_rates set "
426                                                 "for %pM based on beacon"
427                                                 "/probe_resp (0x%x -> 0x%x)\n",
428                                                 sdata->name, sta->sta.addr,
429                                                 prev_rates,
430                                                 sta->sta.supp_rates[band]);
431 #endif
432                                         rates_updated = true;
433                                 }
434                         } else {
435                                 rcu_read_unlock();
436                                 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
437                                                 mgmt->sa, supp_rates, true);
438                         }
439                 }
440
441                 if (sta && elems->wmm_info)
442                         set_sta_flag(sta, WLAN_STA_WME);
443
444                 if (sta && elems->ht_info_elem && elems->ht_cap_elem &&
445                     sdata->u.ibss.channel_type != NL80211_CHAN_NO_HT) {
446                         /* we both use HT */
447                         struct ieee80211_sta_ht_cap sta_ht_cap_new;
448                         enum nl80211_channel_type channel_type =
449                                 ieee80211_ht_info_to_channel_type(
450                                                         elems->ht_info_elem);
451
452                         ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
453                                                           elems->ht_cap_elem,
454                                                           &sta_ht_cap_new);
455
456                         /*
457                          * fall back to HT20 if we don't use or use
458                          * the other extension channel
459                          */
460                         if ((channel_type == NL80211_CHAN_HT40MINUS ||
461                              channel_type == NL80211_CHAN_HT40PLUS) &&
462                             channel_type != sdata->u.ibss.channel_type)
463                                 sta_ht_cap_new.cap &=
464                                         ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
465
466                         if (memcmp(&sta->sta.ht_cap, &sta_ht_cap_new,
467                                    sizeof(sta_ht_cap_new))) {
468                                 memcpy(&sta->sta.ht_cap, &sta_ht_cap_new,
469                                        sizeof(sta_ht_cap_new));
470                                 rates_updated = true;
471                         }
472                 }
473
474                 if (sta && rates_updated)
475                         rate_control_rate_init(sta);
476
477                 rcu_read_unlock();
478         }
479
480         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
481                                         channel, beacon);
482         if (!bss)
483                 return;
484
485         cbss = container_of((void *)bss, struct cfg80211_bss, priv);
486
487         /* was just updated in ieee80211_bss_info_update */
488         beacon_timestamp = cbss->tsf;
489
490         /* check if we need to merge IBSS */
491
492         /* we use a fixed BSSID */
493         if (sdata->u.ibss.fixed_bssid)
494                 goto put_bss;
495
496         /* not an IBSS */
497         if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
498                 goto put_bss;
499
500         /* different channel */
501         if (cbss->channel != local->oper_channel)
502                 goto put_bss;
503
504         /* different SSID */
505         if (elems->ssid_len != sdata->u.ibss.ssid_len ||
506             memcmp(elems->ssid, sdata->u.ibss.ssid,
507                                 sdata->u.ibss.ssid_len))
508                 goto put_bss;
509
510         /* same BSSID */
511         if (compare_ether_addr(cbss->bssid, sdata->u.ibss.bssid) == 0)
512                 goto put_bss;
513
514         if (rx_status->flag & RX_FLAG_MACTIME_MPDU) {
515                 /*
516                  * For correct IBSS merging we need mactime; since mactime is
517                  * defined as the time the first data symbol of the frame hits
518                  * the PHY, and the timestamp of the beacon is defined as "the
519                  * time that the data symbol containing the first bit of the
520                  * timestamp is transmitted to the PHY plus the transmitting
521                  * STA's delays through its local PHY from the MAC-PHY
522                  * interface to its interface with the WM" (802.11 11.1.2)
523                  * - equals the time this bit arrives at the receiver - we have
524                  * to take into account the offset between the two.
525                  *
526                  * E.g. at 1 MBit that means mactime is 192 usec earlier
527                  * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
528                  */
529                 int rate;
530
531                 if (rx_status->flag & RX_FLAG_HT)
532                         rate = 65; /* TODO: HT rates */
533                 else
534                         rate = local->hw.wiphy->bands[band]->
535                                 bitrates[rx_status->rate_idx].bitrate;
536
537                 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
538         } else {
539                 /*
540                  * second best option: get current TSF
541                  * (will return -1 if not supported)
542                  */
543                 rx_timestamp = drv_get_tsf(local, sdata);
544         }
545
546 #ifdef CONFIG_MAC80211_IBSS_DEBUG
547         printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
548                "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
549                mgmt->sa, mgmt->bssid,
550                (unsigned long long)rx_timestamp,
551                (unsigned long long)beacon_timestamp,
552                (unsigned long long)(rx_timestamp - beacon_timestamp),
553                jiffies);
554 #endif
555
556         if (beacon_timestamp > rx_timestamp) {
557 #ifdef CONFIG_MAC80211_IBSS_DEBUG
558                 printk(KERN_DEBUG "%s: beacon TSF higher than "
559                        "local TSF - IBSS merge with BSSID %pM\n",
560                        sdata->name, mgmt->bssid);
561 #endif
562                 ieee80211_sta_join_ibss(sdata, bss);
563                 supp_rates = ieee80211_sta_get_rates(local, elems, band);
564                 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
565                                        supp_rates, true);
566                 rcu_read_unlock();
567         }
568
569  put_bss:
570         ieee80211_rx_bss_put(local, bss);
571 }
572
573 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
574                               const u8 *bssid, const u8 *addr,
575                               u32 supp_rates)
576 {
577         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
578         struct ieee80211_local *local = sdata->local;
579         struct sta_info *sta;
580         int band = local->hw.conf.channel->band;
581
582         /*
583          * XXX: Consider removing the least recently used entry and
584          *      allow new one to be added.
585          */
586         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
587                 if (net_ratelimit())
588                         printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n",
589                                sdata->name, addr);
590                 return;
591         }
592
593         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
594                 return;
595
596         if (compare_ether_addr(bssid, sdata->u.ibss.bssid))
597                 return;
598
599         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
600         if (!sta)
601                 return;
602
603         sta->last_rx = jiffies;
604
605         /* make sure mandatory rates are always added */
606         sta->sta.supp_rates[band] = supp_rates |
607                         ieee80211_mandatory_rates(local, band);
608
609         spin_lock(&ifibss->incomplete_lock);
610         list_add(&sta->list, &ifibss->incomplete_stations);
611         spin_unlock(&ifibss->incomplete_lock);
612         ieee80211_queue_work(&local->hw, &sdata->work);
613 }
614
615 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
616 {
617         struct ieee80211_local *local = sdata->local;
618         int active = 0;
619         struct sta_info *sta;
620
621         lockdep_assert_held(&sdata->u.ibss.mtx);
622
623         rcu_read_lock();
624
625         list_for_each_entry_rcu(sta, &local->sta_list, list) {
626                 if (sta->sdata == sdata &&
627                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
628                                jiffies)) {
629                         active++;
630                         break;
631                 }
632         }
633
634         rcu_read_unlock();
635
636         return active;
637 }
638
639 /*
640  * This function is called with state == IEEE80211_IBSS_MLME_JOINED
641  */
642
643 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
644 {
645         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
646
647         lockdep_assert_held(&ifibss->mtx);
648
649         mod_timer(&ifibss->timer,
650                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
651
652         ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
653
654         if (time_before(jiffies, ifibss->last_scan_completed +
655                        IEEE80211_IBSS_MERGE_INTERVAL))
656                 return;
657
658         if (ieee80211_sta_active_ibss(sdata))
659                 return;
660
661         if (ifibss->fixed_channel)
662                 return;
663
664         printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
665                "IBSS networks with same SSID (merge)\n", sdata->name);
666
667         ieee80211_request_internal_scan(sdata,
668                         ifibss->ssid, ifibss->ssid_len, NULL);
669 }
670
671 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
672 {
673         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
674         u8 bssid[ETH_ALEN];
675         u16 capability;
676         int i;
677
678         lockdep_assert_held(&ifibss->mtx);
679
680         if (ifibss->fixed_bssid) {
681                 memcpy(bssid, ifibss->bssid, ETH_ALEN);
682         } else {
683                 /* Generate random, not broadcast, locally administered BSSID. Mix in
684                  * own MAC address to make sure that devices that do not have proper
685                  * random number generator get different BSSID. */
686                 get_random_bytes(bssid, ETH_ALEN);
687                 for (i = 0; i < ETH_ALEN; i++)
688                         bssid[i] ^= sdata->vif.addr[i];
689                 bssid[0] &= ~0x01;
690                 bssid[0] |= 0x02;
691         }
692
693         printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
694                sdata->name, bssid);
695
696         capability = WLAN_CAPABILITY_IBSS;
697
698         if (ifibss->privacy)
699                 capability |= WLAN_CAPABILITY_PRIVACY;
700         else
701                 sdata->drop_unencrypted = 0;
702
703         __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
704                                   ifibss->channel, ifibss->basic_rates,
705                                   capability, 0);
706 }
707
708 /*
709  * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
710  */
711
712 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
713 {
714         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
715         struct ieee80211_local *local = sdata->local;
716         struct cfg80211_bss *cbss;
717         struct ieee80211_channel *chan = NULL;
718         const u8 *bssid = NULL;
719         int active_ibss;
720         u16 capability;
721
722         lockdep_assert_held(&ifibss->mtx);
723
724         active_ibss = ieee80211_sta_active_ibss(sdata);
725 #ifdef CONFIG_MAC80211_IBSS_DEBUG
726         printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
727                sdata->name, active_ibss);
728 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
729
730         if (active_ibss)
731                 return;
732
733         capability = WLAN_CAPABILITY_IBSS;
734         if (ifibss->privacy)
735                 capability |= WLAN_CAPABILITY_PRIVACY;
736         if (ifibss->fixed_bssid)
737                 bssid = ifibss->bssid;
738         if (ifibss->fixed_channel)
739                 chan = ifibss->channel;
740         if (!is_zero_ether_addr(ifibss->bssid))
741                 bssid = ifibss->bssid;
742         cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
743                                 ifibss->ssid, ifibss->ssid_len,
744                                 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
745                                 capability);
746
747         if (cbss) {
748                 struct ieee80211_bss *bss;
749
750                 bss = (void *)cbss->priv;
751 #ifdef CONFIG_MAC80211_IBSS_DEBUG
752                 printk(KERN_DEBUG "   sta_find_ibss: selected %pM current "
753                        "%pM\n", cbss->bssid, ifibss->bssid);
754 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
755
756                 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
757                        " based on configured SSID\n",
758                        sdata->name, cbss->bssid);
759
760                 ieee80211_sta_join_ibss(sdata, bss);
761                 ieee80211_rx_bss_put(local, bss);
762                 return;
763         }
764
765 #ifdef CONFIG_MAC80211_IBSS_DEBUG
766         printk(KERN_DEBUG "   did not try to join ibss\n");
767 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
768
769         /* Selected IBSS not found in current scan results - try to scan */
770         if (time_after(jiffies, ifibss->last_scan_completed +
771                                         IEEE80211_SCAN_INTERVAL)) {
772                 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
773                        "join\n", sdata->name);
774
775                 ieee80211_request_internal_scan(sdata,
776                                 ifibss->ssid, ifibss->ssid_len,
777                                 ifibss->fixed_channel ? ifibss->channel : NULL);
778         } else {
779                 int interval = IEEE80211_SCAN_INTERVAL;
780
781                 if (time_after(jiffies, ifibss->ibss_join_req +
782                                IEEE80211_IBSS_JOIN_TIMEOUT)) {
783                         if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) {
784                                 ieee80211_sta_create_ibss(sdata);
785                                 return;
786                         }
787                         printk(KERN_DEBUG "%s: IBSS not allowed on"
788                                " %d MHz\n", sdata->name,
789                                local->hw.conf.channel->center_freq);
790
791                         /* No IBSS found - decrease scan interval and continue
792                          * scanning. */
793                         interval = IEEE80211_SCAN_INTERVAL_SLOW;
794                 }
795
796                 mod_timer(&ifibss->timer,
797                           round_jiffies(jiffies + interval));
798         }
799 }
800
801 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
802                                         struct sk_buff *req)
803 {
804         struct ieee80211_mgmt *mgmt = (void *)req->data;
805         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
806         struct ieee80211_local *local = sdata->local;
807         int tx_last_beacon, len = req->len;
808         struct sk_buff *skb;
809         struct ieee80211_mgmt *resp;
810         struct sk_buff *presp;
811         u8 *pos, *end;
812
813         lockdep_assert_held(&ifibss->mtx);
814
815         presp = rcu_dereference_protected(ifibss->presp,
816                                           lockdep_is_held(&ifibss->mtx));
817
818         if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
819             len < 24 + 2 || !presp)
820                 return;
821
822         tx_last_beacon = drv_tx_last_beacon(local);
823
824 #ifdef CONFIG_MAC80211_IBSS_DEBUG
825         printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
826                " (tx_last_beacon=%d)\n",
827                sdata->name, mgmt->sa, mgmt->da,
828                mgmt->bssid, tx_last_beacon);
829 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
830
831         if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
832                 return;
833
834         if (compare_ether_addr(mgmt->bssid, ifibss->bssid) != 0 &&
835             !is_broadcast_ether_addr(mgmt->bssid))
836                 return;
837
838         end = ((u8 *) mgmt) + len;
839         pos = mgmt->u.probe_req.variable;
840         if (pos[0] != WLAN_EID_SSID ||
841             pos + 2 + pos[1] > end) {
842 #ifdef CONFIG_MAC80211_IBSS_DEBUG
843                 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
844                        "from %pM\n",
845                        sdata->name, mgmt->sa);
846 #endif
847                 return;
848         }
849         if (pos[1] != 0 &&
850             (pos[1] != ifibss->ssid_len ||
851              memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
852                 /* Ignore ProbeReq for foreign SSID */
853                 return;
854         }
855
856         /* Reply with ProbeResp */
857         skb = skb_copy(presp, GFP_KERNEL);
858         if (!skb)
859                 return;
860
861         resp = (struct ieee80211_mgmt *) skb->data;
862         memcpy(resp->da, mgmt->sa, ETH_ALEN);
863 #ifdef CONFIG_MAC80211_IBSS_DEBUG
864         printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
865                sdata->name, resp->da);
866 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
867         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
868         ieee80211_tx_skb(sdata, skb);
869 }
870
871 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
872                                          struct ieee80211_mgmt *mgmt,
873                                          size_t len,
874                                          struct ieee80211_rx_status *rx_status)
875 {
876         size_t baselen;
877         struct ieee802_11_elems elems;
878
879         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
880         if (baselen > len)
881                 return;
882
883         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
884                                 &elems);
885
886         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
887 }
888
889 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
890                                      struct ieee80211_mgmt *mgmt,
891                                      size_t len,
892                                      struct ieee80211_rx_status *rx_status)
893 {
894         size_t baselen;
895         struct ieee802_11_elems elems;
896
897         /* Process beacon from the current BSS */
898         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
899         if (baselen > len)
900                 return;
901
902         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
903
904         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
905 }
906
907 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
908                                    struct sk_buff *skb)
909 {
910         struct ieee80211_rx_status *rx_status;
911         struct ieee80211_mgmt *mgmt;
912         u16 fc;
913
914         rx_status = IEEE80211_SKB_RXCB(skb);
915         mgmt = (struct ieee80211_mgmt *) skb->data;
916         fc = le16_to_cpu(mgmt->frame_control);
917
918         mutex_lock(&sdata->u.ibss.mtx);
919
920         if (!sdata->u.ibss.ssid_len)
921                 goto mgmt_out; /* not ready to merge yet */
922
923         switch (fc & IEEE80211_FCTL_STYPE) {
924         case IEEE80211_STYPE_PROBE_REQ:
925                 ieee80211_rx_mgmt_probe_req(sdata, skb);
926                 break;
927         case IEEE80211_STYPE_PROBE_RESP:
928                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
929                                              rx_status);
930                 break;
931         case IEEE80211_STYPE_BEACON:
932                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
933                                          rx_status);
934                 break;
935         case IEEE80211_STYPE_AUTH:
936                 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
937                 break;
938         }
939
940  mgmt_out:
941         mutex_unlock(&sdata->u.ibss.mtx);
942 }
943
944 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
945 {
946         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
947         struct sta_info *sta;
948
949         mutex_lock(&ifibss->mtx);
950
951         /*
952          * Work could be scheduled after scan or similar
953          * when we aren't even joined (or trying) with a
954          * network.
955          */
956         if (!ifibss->ssid_len)
957                 goto out;
958
959         spin_lock_bh(&ifibss->incomplete_lock);
960         while (!list_empty(&ifibss->incomplete_stations)) {
961                 sta = list_first_entry(&ifibss->incomplete_stations,
962                                        struct sta_info, list);
963                 list_del(&sta->list);
964                 spin_unlock_bh(&ifibss->incomplete_lock);
965
966                 ieee80211_ibss_finish_sta(sta, true);
967                 rcu_read_unlock();
968                 spin_lock_bh(&ifibss->incomplete_lock);
969         }
970         spin_unlock_bh(&ifibss->incomplete_lock);
971
972         switch (ifibss->state) {
973         case IEEE80211_IBSS_MLME_SEARCH:
974                 ieee80211_sta_find_ibss(sdata);
975                 break;
976         case IEEE80211_IBSS_MLME_JOINED:
977                 ieee80211_sta_merge_ibss(sdata);
978                 break;
979         default:
980                 WARN_ON(1);
981                 break;
982         }
983
984  out:
985         mutex_unlock(&ifibss->mtx);
986 }
987
988 static void ieee80211_ibss_timer(unsigned long data)
989 {
990         struct ieee80211_sub_if_data *sdata =
991                 (struct ieee80211_sub_if_data *) data;
992         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
993         struct ieee80211_local *local = sdata->local;
994
995         if (local->quiescing) {
996                 ifibss->timer_running = true;
997                 return;
998         }
999
1000         ieee80211_queue_work(&local->hw, &sdata->work);
1001 }
1002
1003 #ifdef CONFIG_PM
1004 void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata)
1005 {
1006         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1007
1008         if (del_timer_sync(&ifibss->timer))
1009                 ifibss->timer_running = true;
1010 }
1011
1012 void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata)
1013 {
1014         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1015
1016         if (ifibss->timer_running) {
1017                 add_timer(&ifibss->timer);
1018                 ifibss->timer_running = false;
1019         }
1020 }
1021 #endif
1022
1023 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1024 {
1025         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1026
1027         setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1028                     (unsigned long) sdata);
1029         mutex_init(&ifibss->mtx);
1030         INIT_LIST_HEAD(&ifibss->incomplete_stations);
1031         spin_lock_init(&ifibss->incomplete_lock);
1032 }
1033
1034 /* scan finished notification */
1035 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1036 {
1037         struct ieee80211_sub_if_data *sdata;
1038
1039         mutex_lock(&local->iflist_mtx);
1040         list_for_each_entry(sdata, &local->interfaces, list) {
1041                 if (!ieee80211_sdata_running(sdata))
1042                         continue;
1043                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1044                         continue;
1045                 sdata->u.ibss.last_scan_completed = jiffies;
1046                 ieee80211_queue_work(&local->hw, &sdata->work);
1047         }
1048         mutex_unlock(&local->iflist_mtx);
1049 }
1050
1051 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1052                         struct cfg80211_ibss_params *params)
1053 {
1054         struct sk_buff *skb;
1055         u32 changed = 0;
1056
1057         skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom +
1058                             sizeof(struct ieee80211_hdr_3addr) +
1059                             12 /* struct ieee80211_mgmt.u.beacon */ +
1060                             2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
1061                             2 + 8 /* max Supported Rates */ +
1062                             3 /* max DS params */ +
1063                             4 /* IBSS params */ +
1064                             2 + (IEEE80211_MAX_SUPP_RATES - 8) +
1065                             2 + sizeof(struct ieee80211_ht_cap) +
1066                             2 + sizeof(struct ieee80211_ht_info) +
1067                             params->ie_len);
1068         if (!skb)
1069                 return -ENOMEM;
1070
1071         mutex_lock(&sdata->u.ibss.mtx);
1072
1073         if (params->bssid) {
1074                 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1075                 sdata->u.ibss.fixed_bssid = true;
1076         } else
1077                 sdata->u.ibss.fixed_bssid = false;
1078
1079         sdata->u.ibss.privacy = params->privacy;
1080         sdata->u.ibss.control_port = params->control_port;
1081         sdata->u.ibss.basic_rates = params->basic_rates;
1082         memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1083                sizeof(params->mcast_rate));
1084
1085         sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1086
1087         sdata->u.ibss.channel = params->channel;
1088         sdata->u.ibss.channel_type = params->channel_type;
1089         sdata->u.ibss.fixed_channel = params->channel_fixed;
1090
1091         /* fix ourselves to that channel now already */
1092         if (params->channel_fixed) {
1093                 sdata->local->oper_channel = params->channel;
1094                 if (!ieee80211_set_channel_type(sdata->local, sdata,
1095                                                params->channel_type)) {
1096                         mutex_unlock(&sdata->u.ibss.mtx);
1097                         kfree_skb(skb);
1098                         return -EINVAL;
1099                 }
1100         }
1101
1102         if (params->ie) {
1103                 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1104                                            GFP_KERNEL);
1105                 if (sdata->u.ibss.ie)
1106                         sdata->u.ibss.ie_len = params->ie_len;
1107         }
1108
1109         sdata->u.ibss.skb = skb;
1110         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1111         sdata->u.ibss.ibss_join_req = jiffies;
1112
1113         memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN);
1114         sdata->u.ibss.ssid_len = params->ssid_len;
1115
1116         mutex_unlock(&sdata->u.ibss.mtx);
1117
1118         mutex_lock(&sdata->local->mtx);
1119         ieee80211_recalc_idle(sdata->local);
1120         mutex_unlock(&sdata->local->mtx);
1121
1122         /*
1123          * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1124          * reserved, but an HT STA shall protect HT transmissions as though
1125          * the HT Protection field were set to non-HT mixed mode.
1126          *
1127          * In an IBSS, the RIFS Mode field of the HT Operation element is
1128          * also reserved, but an HT STA shall operate as though this field
1129          * were set to 1.
1130          */
1131
1132         sdata->vif.bss_conf.ht_operation_mode |=
1133                   IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1134                 | IEEE80211_HT_PARAM_RIFS_MODE;
1135
1136         changed |= BSS_CHANGED_HT;
1137         ieee80211_bss_info_change_notify(sdata, changed);
1138
1139         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1140
1141         return 0;
1142 }
1143
1144 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1145 {
1146         struct sk_buff *skb;
1147         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1148         struct ieee80211_local *local = sdata->local;
1149         struct cfg80211_bss *cbss;
1150         u16 capability;
1151         int active_ibss;
1152         struct sta_info *sta;
1153
1154         mutex_lock(&sdata->u.ibss.mtx);
1155
1156         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1157         memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
1158         sdata->u.ibss.ssid_len = 0;
1159
1160         active_ibss = ieee80211_sta_active_ibss(sdata);
1161
1162         if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) {
1163                 capability = WLAN_CAPABILITY_IBSS;
1164
1165                 if (ifibss->privacy)
1166                         capability |= WLAN_CAPABILITY_PRIVACY;
1167
1168                 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->channel,
1169                                         ifibss->bssid, ifibss->ssid,
1170                                         ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
1171                                         WLAN_CAPABILITY_PRIVACY,
1172                                         capability);
1173
1174                 if (cbss) {
1175                         cfg80211_unlink_bss(local->hw.wiphy, cbss);
1176                         cfg80211_put_bss(cbss);
1177                 }
1178         }
1179
1180         sta_info_flush(sdata->local, sdata);
1181
1182         spin_lock_bh(&ifibss->incomplete_lock);
1183         while (!list_empty(&ifibss->incomplete_stations)) {
1184                 sta = list_first_entry(&ifibss->incomplete_stations,
1185                                        struct sta_info, list);
1186                 list_del(&sta->list);
1187                 spin_unlock_bh(&ifibss->incomplete_lock);
1188
1189                 sta_info_free(local, sta);
1190                 spin_lock_bh(&ifibss->incomplete_lock);
1191         }
1192         spin_unlock_bh(&ifibss->incomplete_lock);
1193
1194         netif_carrier_off(sdata->dev);
1195
1196         /* remove beacon */
1197         kfree(sdata->u.ibss.ie);
1198         skb = rcu_dereference_protected(sdata->u.ibss.presp,
1199                                         lockdep_is_held(&sdata->u.ibss.mtx));
1200         RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
1201         sdata->vif.bss_conf.ibss_joined = false;
1202         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
1203                                                 BSS_CHANGED_IBSS);
1204         synchronize_rcu();
1205         kfree_skb(skb);
1206
1207         skb_queue_purge(&sdata->skb_queue);
1208
1209         del_timer_sync(&sdata->u.ibss.timer);
1210
1211         mutex_unlock(&sdata->u.ibss.mtx);
1212
1213         mutex_lock(&local->mtx);
1214         ieee80211_recalc_idle(sdata->local);
1215         mutex_unlock(&local->mtx);
1216
1217         return 0;
1218 }