33d9d0c3e3d06ce70e831643473dc34ac201deed
[linux-2.6-microblaze.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 (!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 }