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[~shefty/rdma-dev.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 (!cfg80211_can_beacon_sec_chan(local->hw.wiphy, chan, channel_type))
86                 channel_type = NL80211_CHAN_HT20;
87         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
88                 /* can only fail due to HT40+/- mismatch */
89                 channel_type = NL80211_CHAN_HT20;
90                 WARN_ON(!ieee80211_set_channel_type(local, sdata,
91                                                     NL80211_CHAN_HT20));
92         }
93         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
94
95         sband = local->hw.wiphy->bands[chan->band];
96
97         /* build supported rates array */
98         pos = supp_rates;
99         for (i = 0; i < sband->n_bitrates; i++) {
100                 int rate = sband->bitrates[i].bitrate;
101                 u8 basic = 0;
102                 if (basic_rates & BIT(i))
103                         basic = 0x80;
104                 *pos++ = basic | (u8) (rate / 5);
105         }
106
107         /* Build IBSS probe response */
108         mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon));
109         memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
110         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
111                                           IEEE80211_STYPE_PROBE_RESP);
112         eth_broadcast_addr(mgmt->da);
113         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
114         memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
115         mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
116         mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
117         mgmt->u.beacon.capab_info = cpu_to_le16(capability);
118
119         pos = skb_put(skb, 2 + ifibss->ssid_len);
120         *pos++ = WLAN_EID_SSID;
121         *pos++ = ifibss->ssid_len;
122         memcpy(pos, ifibss->ssid, ifibss->ssid_len);
123
124         rates = sband->n_bitrates;
125         if (rates > 8)
126                 rates = 8;
127         pos = skb_put(skb, 2 + rates);
128         *pos++ = WLAN_EID_SUPP_RATES;
129         *pos++ = rates;
130         memcpy(pos, supp_rates, rates);
131
132         if (sband->band == IEEE80211_BAND_2GHZ) {
133                 pos = skb_put(skb, 2 + 1);
134                 *pos++ = WLAN_EID_DS_PARAMS;
135                 *pos++ = 1;
136                 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
137         }
138
139         pos = skb_put(skb, 2 + 2);
140         *pos++ = WLAN_EID_IBSS_PARAMS;
141         *pos++ = 2;
142         /* FIX: set ATIM window based on scan results */
143         *pos++ = 0;
144         *pos++ = 0;
145
146         if (sband->n_bitrates > 8) {
147                 rates = sband->n_bitrates - 8;
148                 pos = skb_put(skb, 2 + rates);
149                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
150                 *pos++ = rates;
151                 memcpy(pos, &supp_rates[8], rates);
152         }
153
154         if (ifibss->ie_len)
155                 memcpy(skb_put(skb, ifibss->ie_len),
156                        ifibss->ie, ifibss->ie_len);
157
158         /* add HT capability and information IEs */
159         if (channel_type && sband->ht_cap.ht_supported) {
160                 pos = skb_put(skb, 4 +
161                                    sizeof(struct ieee80211_ht_cap) +
162                                    sizeof(struct ieee80211_ht_operation));
163                 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
164                                                 sband->ht_cap.cap);
165                 /*
166                  * Note: According to 802.11n-2009 9.13.3.1, HT Protection
167                  * field and RIFS Mode are reserved in IBSS mode, therefore
168                  * keep them at 0
169                  */
170                 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
171                                                  chan, channel_type, 0);
172         }
173
174         if (local->hw.queues >= IEEE80211_NUM_ACS) {
175                 pos = skb_put(skb, 9);
176                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
177                 *pos++ = 7; /* len */
178                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
179                 *pos++ = 0x50;
180                 *pos++ = 0xf2;
181                 *pos++ = 2; /* WME */
182                 *pos++ = 0; /* WME info */
183                 *pos++ = 1; /* WME ver */
184                 *pos++ = 0; /* U-APSD no in use */
185         }
186
187         rcu_assign_pointer(ifibss->presp, skb);
188
189         sdata->vif.bss_conf.beacon_int = beacon_int;
190         sdata->vif.bss_conf.basic_rates = basic_rates;
191         bss_change = BSS_CHANGED_BEACON_INT;
192         bss_change |= ieee80211_reset_erp_info(sdata);
193         bss_change |= BSS_CHANGED_BSSID;
194         bss_change |= BSS_CHANGED_BEACON;
195         bss_change |= BSS_CHANGED_BEACON_ENABLED;
196         bss_change |= BSS_CHANGED_BASIC_RATES;
197         bss_change |= BSS_CHANGED_HT;
198         bss_change |= BSS_CHANGED_IBSS;
199         sdata->vif.bss_conf.ibss_joined = true;
200         ieee80211_bss_info_change_notify(sdata, bss_change);
201
202         ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates);
203
204         ifibss->state = IEEE80211_IBSS_MLME_JOINED;
205         mod_timer(&ifibss->timer,
206                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
207
208         bss = cfg80211_inform_bss_frame(local->hw.wiphy, chan,
209                                         mgmt, skb->len, 0, GFP_KERNEL);
210         cfg80211_put_bss(bss);
211         netif_carrier_on(sdata->dev);
212         cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
213 }
214
215 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
216                                     struct ieee80211_bss *bss)
217 {
218         struct cfg80211_bss *cbss =
219                 container_of((void *)bss, struct cfg80211_bss, priv);
220         struct ieee80211_supported_band *sband;
221         u32 basic_rates;
222         int i, j;
223         u16 beacon_int = cbss->beacon_interval;
224
225         lockdep_assert_held(&sdata->u.ibss.mtx);
226
227         if (beacon_int < 10)
228                 beacon_int = 10;
229
230         sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
231
232         basic_rates = 0;
233
234         for (i = 0; i < bss->supp_rates_len; i++) {
235                 int rate = (bss->supp_rates[i] & 0x7f) * 5;
236                 bool is_basic = !!(bss->supp_rates[i] & 0x80);
237
238                 for (j = 0; j < sband->n_bitrates; j++) {
239                         if (sband->bitrates[j].bitrate == rate) {
240                                 if (is_basic)
241                                         basic_rates |= BIT(j);
242                                 break;
243                         }
244                 }
245         }
246
247         __ieee80211_sta_join_ibss(sdata, cbss->bssid,
248                                   beacon_int,
249                                   cbss->channel,
250                                   basic_rates,
251                                   cbss->capability,
252                                   cbss->tsf);
253 }
254
255 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta,
256                                                   bool auth)
257         __acquires(RCU)
258 {
259         struct ieee80211_sub_if_data *sdata = sta->sdata;
260         u8 addr[ETH_ALEN];
261
262         memcpy(addr, sta->sta.addr, ETH_ALEN);
263
264         ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
265
266         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
267         sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
268         /* authorize the station only if the network is not RSN protected. If
269          * not wait for the userspace to authorize it */
270         if (!sta->sdata->u.ibss.control_port)
271                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
272
273         rate_control_rate_init(sta);
274
275         /* If it fails, maybe we raced another insertion? */
276         if (sta_info_insert_rcu(sta))
277                 return sta_info_get(sdata, addr);
278         if (auth && !sdata->u.ibss.auth_frame_registrations) {
279                 ibss_dbg(sdata,
280                          "TX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=1)\n",
281                          sdata->vif.addr, addr, sdata->u.ibss.bssid);
282                 ieee80211_send_auth(sdata, 1, WLAN_AUTH_OPEN, NULL, 0,
283                                     addr, sdata->u.ibss.bssid, NULL, 0, 0);
284         }
285         return sta;
286 }
287
288 static struct sta_info *
289 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
290                        const u8 *bssid, const u8 *addr,
291                        u32 supp_rates, bool auth)
292         __acquires(RCU)
293 {
294         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
295         struct ieee80211_local *local = sdata->local;
296         struct sta_info *sta;
297         int band = local->oper_channel->band;
298
299         /*
300          * XXX: Consider removing the least recently used entry and
301          *      allow new one to be added.
302          */
303         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
304                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
305                                     sdata->name, addr);
306                 rcu_read_lock();
307                 return NULL;
308         }
309
310         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
311                 rcu_read_lock();
312                 return NULL;
313         }
314
315         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
316                 rcu_read_lock();
317                 return NULL;
318         }
319
320         sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
321         if (!sta) {
322                 rcu_read_lock();
323                 return NULL;
324         }
325
326         sta->last_rx = jiffies;
327
328         /* make sure mandatory rates are always added */
329         sta->sta.supp_rates[band] = supp_rates |
330                         ieee80211_mandatory_rates(local, band);
331
332         return ieee80211_ibss_finish_sta(sta, auth);
333 }
334
335 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
336                                           struct ieee80211_mgmt *mgmt,
337                                           size_t len)
338 {
339         u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
340
341         if (len < IEEE80211_DEAUTH_FRAME_LEN)
342                 return;
343
344         ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
345                  mgmt->sa, mgmt->da, mgmt->bssid, reason);
346         sta_info_destroy_addr(sdata, mgmt->sa);
347 }
348
349 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
350                                         struct ieee80211_mgmt *mgmt,
351                                         size_t len)
352 {
353         u16 auth_alg, auth_transaction;
354         struct sta_info *sta;
355         u8 deauth_frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
356
357         lockdep_assert_held(&sdata->u.ibss.mtx);
358
359         if (len < 24 + 6)
360                 return;
361
362         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
363         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
364
365         if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
366                 return;
367         ibss_dbg(sdata,
368                  "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
369                  mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
370         sta_info_destroy_addr(sdata, mgmt->sa);
371         sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 0, false);
372         rcu_read_unlock();
373
374         /*
375          * if we have any problem in allocating the new station, we reply with a
376          * DEAUTH frame to tell the other end that we had a problem
377          */
378         if (!sta) {
379                 ieee80211_send_deauth_disassoc(sdata, sdata->u.ibss.bssid,
380                                                IEEE80211_STYPE_DEAUTH,
381                                                WLAN_REASON_UNSPECIFIED, true,
382                                                deauth_frame_buf);
383                 return;
384         }
385
386         /*
387          * IEEE 802.11 standard does not require authentication in IBSS
388          * networks and most implementations do not seem to use it.
389          * However, try to reply to authentication attempts if someone
390          * has actually implemented this.
391          */
392         ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, NULL, 0,
393                             mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0);
394 }
395
396 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
397                                   struct ieee80211_mgmt *mgmt,
398                                   size_t len,
399                                   struct ieee80211_rx_status *rx_status,
400                                   struct ieee802_11_elems *elems,
401                                   bool beacon)
402 {
403         struct ieee80211_local *local = sdata->local;
404         int freq;
405         struct cfg80211_bss *cbss;
406         struct ieee80211_bss *bss;
407         struct sta_info *sta;
408         struct ieee80211_channel *channel;
409         u64 beacon_timestamp, rx_timestamp;
410         u32 supp_rates = 0;
411         enum ieee80211_band band = rx_status->band;
412         struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
413         bool rates_updated = false;
414
415         if (elems->ds_params && elems->ds_params_len == 1)
416                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
417                                                       band);
418         else
419                 freq = rx_status->freq;
420
421         channel = ieee80211_get_channel(local->hw.wiphy, freq);
422
423         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
424                 return;
425
426         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
427             ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) {
428
429                 rcu_read_lock();
430                 sta = sta_info_get(sdata, mgmt->sa);
431
432                 if (elems->supp_rates) {
433                         supp_rates = ieee80211_sta_get_rates(local, elems,
434                                                              band, NULL);
435                         if (sta) {
436                                 u32 prev_rates;
437
438                                 prev_rates = sta->sta.supp_rates[band];
439                                 /* make sure mandatory rates are always added */
440                                 sta->sta.supp_rates[band] = supp_rates |
441                                         ieee80211_mandatory_rates(local, band);
442
443                                 if (sta->sta.supp_rates[band] != prev_rates) {
444                                         ibss_dbg(sdata,
445                                                  "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
446                                                  sta->sta.addr, prev_rates,
447                                                  sta->sta.supp_rates[band]);
448                                         rates_updated = true;
449                                 }
450                         } else {
451                                 rcu_read_unlock();
452                                 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
453                                                 mgmt->sa, supp_rates, true);
454                         }
455                 }
456
457                 if (sta && elems->wmm_info)
458                         set_sta_flag(sta, WLAN_STA_WME);
459
460                 if (sta && elems->ht_operation && elems->ht_cap_elem &&
461                     sdata->u.ibss.channel_type != NL80211_CHAN_NO_HT) {
462                         /* we both use HT */
463                         struct ieee80211_sta_ht_cap sta_ht_cap_new;
464                         enum nl80211_channel_type channel_type =
465                                 ieee80211_ht_oper_to_channel_type(
466                                                         elems->ht_operation);
467
468                         ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
469                                                           elems->ht_cap_elem,
470                                                           &sta_ht_cap_new);
471
472                         /*
473                          * fall back to HT20 if we don't use or use
474                          * the other extension channel
475                          */
476                         if (!(channel_type == NL80211_CHAN_HT40MINUS ||
477                               channel_type == NL80211_CHAN_HT40PLUS) ||
478                             channel_type != sdata->u.ibss.channel_type)
479                                 sta_ht_cap_new.cap &=
480                                         ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
481
482                         if (memcmp(&sta->sta.ht_cap, &sta_ht_cap_new,
483                                    sizeof(sta_ht_cap_new))) {
484                                 memcpy(&sta->sta.ht_cap, &sta_ht_cap_new,
485                                        sizeof(sta_ht_cap_new));
486                                 rates_updated = true;
487                         }
488                 }
489
490                 if (sta && rates_updated) {
491                         drv_sta_rc_update(local, sdata, &sta->sta,
492                                           IEEE80211_RC_SUPP_RATES_CHANGED);
493                         rate_control_rate_init(sta);
494                 }
495
496                 rcu_read_unlock();
497         }
498
499         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
500                                         channel, beacon);
501         if (!bss)
502                 return;
503
504         cbss = container_of((void *)bss, struct cfg80211_bss, priv);
505
506         /* was just updated in ieee80211_bss_info_update */
507         beacon_timestamp = cbss->tsf;
508
509         /* check if we need to merge IBSS */
510
511         /* we use a fixed BSSID */
512         if (sdata->u.ibss.fixed_bssid)
513                 goto put_bss;
514
515         /* not an IBSS */
516         if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
517                 goto put_bss;
518
519         /* different channel */
520         if (cbss->channel != local->oper_channel)
521                 goto put_bss;
522
523         /* different SSID */
524         if (elems->ssid_len != sdata->u.ibss.ssid_len ||
525             memcmp(elems->ssid, sdata->u.ibss.ssid,
526                                 sdata->u.ibss.ssid_len))
527                 goto put_bss;
528
529         /* same BSSID */
530         if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
531                 goto put_bss;
532
533         if (rx_status->flag & RX_FLAG_MACTIME_MPDU) {
534                 /*
535                  * For correct IBSS merging we need mactime; since mactime is
536                  * defined as the time the first data symbol of the frame hits
537                  * the PHY, and the timestamp of the beacon is defined as "the
538                  * time that the data symbol containing the first bit of the
539                  * timestamp is transmitted to the PHY plus the transmitting
540                  * STA's delays through its local PHY from the MAC-PHY
541                  * interface to its interface with the WM" (802.11 11.1.2)
542                  * - equals the time this bit arrives at the receiver - we have
543                  * to take into account the offset between the two.
544                  *
545                  * E.g. at 1 MBit that means mactime is 192 usec earlier
546                  * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
547                  */
548                 int rate;
549
550                 if (rx_status->flag & RX_FLAG_HT)
551                         rate = 65; /* TODO: HT rates */
552                 else
553                         rate = local->hw.wiphy->bands[band]->
554                                 bitrates[rx_status->rate_idx].bitrate;
555
556                 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
557         } else {
558                 /*
559                  * second best option: get current TSF
560                  * (will return -1 if not supported)
561                  */
562                 rx_timestamp = drv_get_tsf(local, sdata);
563         }
564
565         ibss_dbg(sdata,
566                  "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
567                  mgmt->sa, mgmt->bssid,
568                  (unsigned long long)rx_timestamp,
569                  (unsigned long long)beacon_timestamp,
570                  (unsigned long long)(rx_timestamp - beacon_timestamp),
571                  jiffies);
572
573         if (beacon_timestamp > rx_timestamp) {
574                 ibss_dbg(sdata,
575                          "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
576                          mgmt->bssid);
577                 ieee80211_sta_join_ibss(sdata, bss);
578                 supp_rates = ieee80211_sta_get_rates(local, elems, band, NULL);
579                 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
580                                        supp_rates, true);
581                 rcu_read_unlock();
582         }
583
584  put_bss:
585         ieee80211_rx_bss_put(local, bss);
586 }
587
588 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
589                               const u8 *bssid, const u8 *addr,
590                               u32 supp_rates)
591 {
592         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
593         struct ieee80211_local *local = sdata->local;
594         struct sta_info *sta;
595         int band = local->oper_channel->band;
596
597         /*
598          * XXX: Consider removing the least recently used entry and
599          *      allow new one to be added.
600          */
601         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
602                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
603                                     sdata->name, addr);
604                 return;
605         }
606
607         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
608                 return;
609
610         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
611                 return;
612
613         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
614         if (!sta)
615                 return;
616
617         sta->last_rx = jiffies;
618
619         /* make sure mandatory rates are always added */
620         sta->sta.supp_rates[band] = supp_rates |
621                         ieee80211_mandatory_rates(local, band);
622
623         spin_lock(&ifibss->incomplete_lock);
624         list_add(&sta->list, &ifibss->incomplete_stations);
625         spin_unlock(&ifibss->incomplete_lock);
626         ieee80211_queue_work(&local->hw, &sdata->work);
627 }
628
629 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
630 {
631         struct ieee80211_local *local = sdata->local;
632         int active = 0;
633         struct sta_info *sta;
634
635         lockdep_assert_held(&sdata->u.ibss.mtx);
636
637         rcu_read_lock();
638
639         list_for_each_entry_rcu(sta, &local->sta_list, list) {
640                 if (sta->sdata == sdata &&
641                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
642                                jiffies)) {
643                         active++;
644                         break;
645                 }
646         }
647
648         rcu_read_unlock();
649
650         return active;
651 }
652
653 /*
654  * This function is called with state == IEEE80211_IBSS_MLME_JOINED
655  */
656
657 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
658 {
659         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
660
661         lockdep_assert_held(&ifibss->mtx);
662
663         mod_timer(&ifibss->timer,
664                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
665
666         ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
667
668         if (time_before(jiffies, ifibss->last_scan_completed +
669                        IEEE80211_IBSS_MERGE_INTERVAL))
670                 return;
671
672         if (ieee80211_sta_active_ibss(sdata))
673                 return;
674
675         if (ifibss->fixed_channel)
676                 return;
677
678         sdata_info(sdata,
679                    "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
680
681         ieee80211_request_internal_scan(sdata,
682                         ifibss->ssid, ifibss->ssid_len, NULL);
683 }
684
685 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
686 {
687         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
688         u8 bssid[ETH_ALEN];
689         u16 capability;
690         int i;
691
692         lockdep_assert_held(&ifibss->mtx);
693
694         if (ifibss->fixed_bssid) {
695                 memcpy(bssid, ifibss->bssid, ETH_ALEN);
696         } else {
697                 /* Generate random, not broadcast, locally administered BSSID. Mix in
698                  * own MAC address to make sure that devices that do not have proper
699                  * random number generator get different BSSID. */
700                 get_random_bytes(bssid, ETH_ALEN);
701                 for (i = 0; i < ETH_ALEN; i++)
702                         bssid[i] ^= sdata->vif.addr[i];
703                 bssid[0] &= ~0x01;
704                 bssid[0] |= 0x02;
705         }
706
707         sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
708
709         capability = WLAN_CAPABILITY_IBSS;
710
711         if (ifibss->privacy)
712                 capability |= WLAN_CAPABILITY_PRIVACY;
713         else
714                 sdata->drop_unencrypted = 0;
715
716         __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
717                                   ifibss->channel, ifibss->basic_rates,
718                                   capability, 0);
719 }
720
721 /*
722  * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
723  */
724
725 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
726 {
727         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
728         struct ieee80211_local *local = sdata->local;
729         struct cfg80211_bss *cbss;
730         struct ieee80211_channel *chan = NULL;
731         const u8 *bssid = NULL;
732         int active_ibss;
733         u16 capability;
734
735         lockdep_assert_held(&ifibss->mtx);
736
737         active_ibss = ieee80211_sta_active_ibss(sdata);
738         ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
739
740         if (active_ibss)
741                 return;
742
743         capability = WLAN_CAPABILITY_IBSS;
744         if (ifibss->privacy)
745                 capability |= WLAN_CAPABILITY_PRIVACY;
746         if (ifibss->fixed_bssid)
747                 bssid = ifibss->bssid;
748         if (ifibss->fixed_channel)
749                 chan = ifibss->channel;
750         if (!is_zero_ether_addr(ifibss->bssid))
751                 bssid = ifibss->bssid;
752         cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
753                                 ifibss->ssid, ifibss->ssid_len,
754                                 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
755                                 capability);
756
757         if (cbss) {
758                 struct ieee80211_bss *bss;
759
760                 bss = (void *)cbss->priv;
761                 ibss_dbg(sdata,
762                          "sta_find_ibss: selected %pM current %pM\n",
763                          cbss->bssid, ifibss->bssid);
764                 sdata_info(sdata,
765                            "Selected IBSS BSSID %pM based on configured SSID\n",
766                            cbss->bssid);
767
768                 ieee80211_sta_join_ibss(sdata, bss);
769                 ieee80211_rx_bss_put(local, bss);
770                 return;
771         }
772
773         ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
774
775         /* Selected IBSS not found in current scan results - try to scan */
776         if (time_after(jiffies, ifibss->last_scan_completed +
777                                         IEEE80211_SCAN_INTERVAL)) {
778                 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
779
780                 ieee80211_request_internal_scan(sdata,
781                                 ifibss->ssid, ifibss->ssid_len,
782                                 ifibss->fixed_channel ? ifibss->channel : NULL);
783         } else {
784                 int interval = IEEE80211_SCAN_INTERVAL;
785
786                 if (time_after(jiffies, ifibss->ibss_join_req +
787                                IEEE80211_IBSS_JOIN_TIMEOUT)) {
788                         if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) {
789                                 ieee80211_sta_create_ibss(sdata);
790                                 return;
791                         }
792                         sdata_info(sdata, "IBSS not allowed on %d MHz\n",
793                                    local->oper_channel->center_freq);
794
795                         /* No IBSS found - decrease scan interval and continue
796                          * scanning. */
797                         interval = IEEE80211_SCAN_INTERVAL_SLOW;
798                 }
799
800                 mod_timer(&ifibss->timer,
801                           round_jiffies(jiffies + interval));
802         }
803 }
804
805 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
806                                         struct sk_buff *req)
807 {
808         struct ieee80211_mgmt *mgmt = (void *)req->data;
809         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
810         struct ieee80211_local *local = sdata->local;
811         int tx_last_beacon, len = req->len;
812         struct sk_buff *skb;
813         struct ieee80211_mgmt *resp;
814         struct sk_buff *presp;
815         u8 *pos, *end;
816
817         lockdep_assert_held(&ifibss->mtx);
818
819         presp = rcu_dereference_protected(ifibss->presp,
820                                           lockdep_is_held(&ifibss->mtx));
821
822         if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
823             len < 24 + 2 || !presp)
824                 return;
825
826         tx_last_beacon = drv_tx_last_beacon(local);
827
828         ibss_dbg(sdata,
829                  "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
830                  mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
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                 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
844                          mgmt->sa);
845                 return;
846         }
847         if (pos[1] != 0 &&
848             (pos[1] != ifibss->ssid_len ||
849              memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
850                 /* Ignore ProbeReq for foreign SSID */
851                 return;
852         }
853
854         /* Reply with ProbeResp */
855         skb = skb_copy(presp, GFP_KERNEL);
856         if (!skb)
857                 return;
858
859         resp = (struct ieee80211_mgmt *) skb->data;
860         memcpy(resp->da, mgmt->sa, ETH_ALEN);
861         ibss_dbg(sdata, "Sending ProbeResp to %pM\n", resp->da);
862         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
863         ieee80211_tx_skb(sdata, skb);
864 }
865
866 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
867                                          struct ieee80211_mgmt *mgmt,
868                                          size_t len,
869                                          struct ieee80211_rx_status *rx_status)
870 {
871         size_t baselen;
872         struct ieee802_11_elems elems;
873
874         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
875         if (baselen > len)
876                 return;
877
878         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
879                                 &elems);
880
881         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
882 }
883
884 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
885                                      struct ieee80211_mgmt *mgmt,
886                                      size_t len,
887                                      struct ieee80211_rx_status *rx_status)
888 {
889         size_t baselen;
890         struct ieee802_11_elems elems;
891
892         /* Process beacon from the current BSS */
893         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
894         if (baselen > len)
895                 return;
896
897         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
898
899         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
900 }
901
902 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
903                                    struct sk_buff *skb)
904 {
905         struct ieee80211_rx_status *rx_status;
906         struct ieee80211_mgmt *mgmt;
907         u16 fc;
908
909         rx_status = IEEE80211_SKB_RXCB(skb);
910         mgmt = (struct ieee80211_mgmt *) skb->data;
911         fc = le16_to_cpu(mgmt->frame_control);
912
913         mutex_lock(&sdata->u.ibss.mtx);
914
915         if (!sdata->u.ibss.ssid_len)
916                 goto mgmt_out; /* not ready to merge yet */
917
918         switch (fc & IEEE80211_FCTL_STYPE) {
919         case IEEE80211_STYPE_PROBE_REQ:
920                 ieee80211_rx_mgmt_probe_req(sdata, skb);
921                 break;
922         case IEEE80211_STYPE_PROBE_RESP:
923                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
924                                              rx_status);
925                 break;
926         case IEEE80211_STYPE_BEACON:
927                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
928                                          rx_status);
929                 break;
930         case IEEE80211_STYPE_AUTH:
931                 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
932                 break;
933         case IEEE80211_STYPE_DEAUTH:
934                 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
935                 break;
936         }
937
938  mgmt_out:
939         mutex_unlock(&sdata->u.ibss.mtx);
940 }
941
942 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
943 {
944         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
945         struct sta_info *sta;
946
947         mutex_lock(&ifibss->mtx);
948
949         /*
950          * Work could be scheduled after scan or similar
951          * when we aren't even joined (or trying) with a
952          * network.
953          */
954         if (!ifibss->ssid_len)
955                 goto out;
956
957         spin_lock_bh(&ifibss->incomplete_lock);
958         while (!list_empty(&ifibss->incomplete_stations)) {
959                 sta = list_first_entry(&ifibss->incomplete_stations,
960                                        struct sta_info, list);
961                 list_del(&sta->list);
962                 spin_unlock_bh(&ifibss->incomplete_lock);
963
964                 ieee80211_ibss_finish_sta(sta, true);
965                 rcu_read_unlock();
966                 spin_lock_bh(&ifibss->incomplete_lock);
967         }
968         spin_unlock_bh(&ifibss->incomplete_lock);
969
970         switch (ifibss->state) {
971         case IEEE80211_IBSS_MLME_SEARCH:
972                 ieee80211_sta_find_ibss(sdata);
973                 break;
974         case IEEE80211_IBSS_MLME_JOINED:
975                 ieee80211_sta_merge_ibss(sdata);
976                 break;
977         default:
978                 WARN_ON(1);
979                 break;
980         }
981
982  out:
983         mutex_unlock(&ifibss->mtx);
984 }
985
986 static void ieee80211_ibss_timer(unsigned long data)
987 {
988         struct ieee80211_sub_if_data *sdata =
989                 (struct ieee80211_sub_if_data *) data;
990         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
991         struct ieee80211_local *local = sdata->local;
992
993         if (local->quiescing) {
994                 ifibss->timer_running = true;
995                 return;
996         }
997
998         ieee80211_queue_work(&local->hw, &sdata->work);
999 }
1000
1001 #ifdef CONFIG_PM
1002 void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata)
1003 {
1004         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1005
1006         if (del_timer_sync(&ifibss->timer))
1007                 ifibss->timer_running = true;
1008 }
1009
1010 void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata)
1011 {
1012         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1013
1014         if (ifibss->timer_running) {
1015                 add_timer(&ifibss->timer);
1016                 ifibss->timer_running = false;
1017         }
1018 }
1019 #endif
1020
1021 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1022 {
1023         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1024
1025         setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1026                     (unsigned long) sdata);
1027         mutex_init(&ifibss->mtx);
1028         INIT_LIST_HEAD(&ifibss->incomplete_stations);
1029         spin_lock_init(&ifibss->incomplete_lock);
1030 }
1031
1032 /* scan finished notification */
1033 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1034 {
1035         struct ieee80211_sub_if_data *sdata;
1036
1037         mutex_lock(&local->iflist_mtx);
1038         list_for_each_entry(sdata, &local->interfaces, list) {
1039                 if (!ieee80211_sdata_running(sdata))
1040                         continue;
1041                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1042                         continue;
1043                 sdata->u.ibss.last_scan_completed = jiffies;
1044                 ieee80211_queue_work(&local->hw, &sdata->work);
1045         }
1046         mutex_unlock(&local->iflist_mtx);
1047 }
1048
1049 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1050                         struct cfg80211_ibss_params *params)
1051 {
1052         struct sk_buff *skb;
1053         u32 changed = 0;
1054
1055         skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom +
1056                             sizeof(struct ieee80211_hdr_3addr) +
1057                             12 /* struct ieee80211_mgmt.u.beacon */ +
1058                             2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
1059                             2 + 8 /* max Supported Rates */ +
1060                             3 /* max DS params */ +
1061                             4 /* IBSS params */ +
1062                             2 + (IEEE80211_MAX_SUPP_RATES - 8) +
1063                             2 + sizeof(struct ieee80211_ht_cap) +
1064                             2 + sizeof(struct ieee80211_ht_operation) +
1065                             params->ie_len);
1066         if (!skb)
1067                 return -ENOMEM;
1068
1069         mutex_lock(&sdata->u.ibss.mtx);
1070
1071         if (params->bssid) {
1072                 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1073                 sdata->u.ibss.fixed_bssid = true;
1074         } else
1075                 sdata->u.ibss.fixed_bssid = false;
1076
1077         sdata->u.ibss.privacy = params->privacy;
1078         sdata->u.ibss.control_port = params->control_port;
1079         sdata->u.ibss.basic_rates = params->basic_rates;
1080         memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1081                sizeof(params->mcast_rate));
1082
1083         sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1084
1085         sdata->u.ibss.channel = params->channel;
1086         sdata->u.ibss.channel_type = params->channel_type;
1087         sdata->u.ibss.fixed_channel = params->channel_fixed;
1088
1089         /* fix ourselves to that channel now already */
1090         if (params->channel_fixed) {
1091                 sdata->local->oper_channel = params->channel;
1092                 if (!ieee80211_set_channel_type(sdata->local, sdata,
1093                                                params->channel_type)) {
1094                         mutex_unlock(&sdata->u.ibss.mtx);
1095                         kfree_skb(skb);
1096                         return -EINVAL;
1097                 }
1098         }
1099
1100         if (params->ie) {
1101                 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1102                                            GFP_KERNEL);
1103                 if (sdata->u.ibss.ie)
1104                         sdata->u.ibss.ie_len = params->ie_len;
1105         }
1106
1107         sdata->u.ibss.skb = skb;
1108         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1109         sdata->u.ibss.ibss_join_req = jiffies;
1110
1111         memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1112         sdata->u.ibss.ssid_len = params->ssid_len;
1113
1114         mutex_unlock(&sdata->u.ibss.mtx);
1115
1116         mutex_lock(&sdata->local->mtx);
1117         ieee80211_recalc_idle(sdata->local);
1118         mutex_unlock(&sdata->local->mtx);
1119
1120         /*
1121          * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1122          * reserved, but an HT STA shall protect HT transmissions as though
1123          * the HT Protection field were set to non-HT mixed mode.
1124          *
1125          * In an IBSS, the RIFS Mode field of the HT Operation element is
1126          * also reserved, but an HT STA shall operate as though this field
1127          * were set to 1.
1128          */
1129
1130         sdata->vif.bss_conf.ht_operation_mode |=
1131                   IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1132                 | IEEE80211_HT_PARAM_RIFS_MODE;
1133
1134         changed |= BSS_CHANGED_HT;
1135         ieee80211_bss_info_change_notify(sdata, changed);
1136
1137         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1138
1139         return 0;
1140 }
1141
1142 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1143 {
1144         struct sk_buff *skb;
1145         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1146         struct ieee80211_local *local = sdata->local;
1147         struct cfg80211_bss *cbss;
1148         u16 capability;
1149         int active_ibss;
1150         struct sta_info *sta;
1151
1152         mutex_lock(&sdata->u.ibss.mtx);
1153
1154         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1155         memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
1156         sdata->u.ibss.ssid_len = 0;
1157
1158         active_ibss = ieee80211_sta_active_ibss(sdata);
1159
1160         if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) {
1161                 capability = WLAN_CAPABILITY_IBSS;
1162
1163                 if (ifibss->privacy)
1164                         capability |= WLAN_CAPABILITY_PRIVACY;
1165
1166                 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->channel,
1167                                         ifibss->bssid, ifibss->ssid,
1168                                         ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
1169                                         WLAN_CAPABILITY_PRIVACY,
1170                                         capability);
1171
1172                 if (cbss) {
1173                         cfg80211_unlink_bss(local->hw.wiphy, cbss);
1174                         cfg80211_put_bss(cbss);
1175                 }
1176         }
1177
1178         sta_info_flush(sdata->local, sdata);
1179
1180         spin_lock_bh(&ifibss->incomplete_lock);
1181         while (!list_empty(&ifibss->incomplete_stations)) {
1182                 sta = list_first_entry(&ifibss->incomplete_stations,
1183                                        struct sta_info, list);
1184                 list_del(&sta->list);
1185                 spin_unlock_bh(&ifibss->incomplete_lock);
1186
1187                 sta_info_free(local, sta);
1188                 spin_lock_bh(&ifibss->incomplete_lock);
1189         }
1190         spin_unlock_bh(&ifibss->incomplete_lock);
1191
1192         netif_carrier_off(sdata->dev);
1193
1194         /* remove beacon */
1195         kfree(sdata->u.ibss.ie);
1196         skb = rcu_dereference_protected(sdata->u.ibss.presp,
1197                                         lockdep_is_held(&sdata->u.ibss.mtx));
1198         RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
1199         sdata->vif.bss_conf.ibss_joined = false;
1200         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
1201                                                 BSS_CHANGED_IBSS);
1202         synchronize_rcu();
1203         kfree_skb(skb);
1204
1205         skb_queue_purge(&sdata->skb_queue);
1206
1207         del_timer_sync(&sdata->u.ibss.timer);
1208
1209         mutex_unlock(&sdata->u.ibss.mtx);
1210
1211         mutex_lock(&local->mtx);
1212         ieee80211_recalc_idle(sdata->local);
1213         mutex_unlock(&local->mtx);
1214
1215         return 0;
1216 }