mac80211: ibss: Fix channel type enum in ieee80211_sta_join_ibss()
[sfrench/cifs-2.6.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  * Copyright 2013-2014  Intel Mobile Communications GmbH
10  * Copyright(c) 2016 Intel Deutschland GmbH
11  *
12  * This program is free software; you can redistribute it and/or modify
13  * it under the terms of the GNU General Public License version 2 as
14  * published by the Free Software Foundation.
15  */
16
17 #include <linux/delay.h>
18 #include <linux/slab.h>
19 #include <linux/if_ether.h>
20 #include <linux/skbuff.h>
21 #include <linux/if_arp.h>
22 #include <linux/etherdevice.h>
23 #include <linux/rtnetlink.h>
24 #include <net/mac80211.h>
25
26 #include "ieee80211_i.h"
27 #include "driver-ops.h"
28 #include "rate.h"
29
30 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
31 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
32
33 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
34 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
35 #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ)
36
37 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
38
39 static struct beacon_data *
40 ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata,
41                            const int beacon_int, const u32 basic_rates,
42                            const u16 capability, u64 tsf,
43                            struct cfg80211_chan_def *chandef,
44                            bool *have_higher_than_11mbit,
45                            struct cfg80211_csa_settings *csa_settings)
46 {
47         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
48         struct ieee80211_local *local = sdata->local;
49         int rates_n = 0, i, ri;
50         struct ieee80211_mgmt *mgmt;
51         u8 *pos;
52         struct ieee80211_supported_band *sband;
53         u32 rate_flags, rates = 0, rates_added = 0;
54         struct beacon_data *presp;
55         int frame_len;
56         int shift;
57
58         /* Build IBSS probe response */
59         frame_len = sizeof(struct ieee80211_hdr_3addr) +
60                     12 /* struct ieee80211_mgmt.u.beacon */ +
61                     2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
62                     2 + 8 /* max Supported Rates */ +
63                     3 /* max DS params */ +
64                     4 /* IBSS params */ +
65                     5 /* Channel Switch Announcement */ +
66                     2 + (IEEE80211_MAX_SUPP_RATES - 8) +
67                     2 + sizeof(struct ieee80211_ht_cap) +
68                     2 + sizeof(struct ieee80211_ht_operation) +
69                     ifibss->ie_len;
70         presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
71         if (!presp)
72                 return NULL;
73
74         presp->head = (void *)(presp + 1);
75
76         mgmt = (void *) presp->head;
77         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
78                                           IEEE80211_STYPE_PROBE_RESP);
79         eth_broadcast_addr(mgmt->da);
80         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
81         memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
82         mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
83         mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
84         mgmt->u.beacon.capab_info = cpu_to_le16(capability);
85
86         pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
87
88         *pos++ = WLAN_EID_SSID;
89         *pos++ = ifibss->ssid_len;
90         memcpy(pos, ifibss->ssid, ifibss->ssid_len);
91         pos += ifibss->ssid_len;
92
93         sband = local->hw.wiphy->bands[chandef->chan->band];
94         rate_flags = ieee80211_chandef_rate_flags(chandef);
95         shift = ieee80211_chandef_get_shift(chandef);
96         rates_n = 0;
97         if (have_higher_than_11mbit)
98                 *have_higher_than_11mbit = false;
99
100         for (i = 0; i < sband->n_bitrates; i++) {
101                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
102                         continue;
103                 if (sband->bitrates[i].bitrate > 110 &&
104                     have_higher_than_11mbit)
105                         *have_higher_than_11mbit = true;
106
107                 rates |= BIT(i);
108                 rates_n++;
109         }
110
111         *pos++ = WLAN_EID_SUPP_RATES;
112         *pos++ = min_t(int, 8, rates_n);
113         for (ri = 0; ri < sband->n_bitrates; ri++) {
114                 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
115                                         5 * (1 << shift));
116                 u8 basic = 0;
117                 if (!(rates & BIT(ri)))
118                         continue;
119
120                 if (basic_rates & BIT(ri))
121                         basic = 0x80;
122                 *pos++ = basic | (u8) rate;
123                 if (++rates_added == 8) {
124                         ri++; /* continue at next rate for EXT_SUPP_RATES */
125                         break;
126                 }
127         }
128
129         if (sband->band == NL80211_BAND_2GHZ) {
130                 *pos++ = WLAN_EID_DS_PARAMS;
131                 *pos++ = 1;
132                 *pos++ = ieee80211_frequency_to_channel(
133                                 chandef->chan->center_freq);
134         }
135
136         *pos++ = WLAN_EID_IBSS_PARAMS;
137         *pos++ = 2;
138         /* FIX: set ATIM window based on scan results */
139         *pos++ = 0;
140         *pos++ = 0;
141
142         if (csa_settings) {
143                 *pos++ = WLAN_EID_CHANNEL_SWITCH;
144                 *pos++ = 3;
145                 *pos++ = csa_settings->block_tx ? 1 : 0;
146                 *pos++ = ieee80211_frequency_to_channel(
147                                 csa_settings->chandef.chan->center_freq);
148                 presp->csa_counter_offsets[0] = (pos - presp->head);
149                 *pos++ = csa_settings->count;
150                 presp->csa_current_counter = csa_settings->count;
151         }
152
153         /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
154         if (rates_n > 8) {
155                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
156                 *pos++ = rates_n - 8;
157                 for (; ri < sband->n_bitrates; ri++) {
158                         int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
159                                                 5 * (1 << shift));
160                         u8 basic = 0;
161                         if (!(rates & BIT(ri)))
162                                 continue;
163
164                         if (basic_rates & BIT(ri))
165                                 basic = 0x80;
166                         *pos++ = basic | (u8) rate;
167                 }
168         }
169
170         if (ifibss->ie_len) {
171                 memcpy(pos, ifibss->ie, ifibss->ie_len);
172                 pos += ifibss->ie_len;
173         }
174
175         /* add HT capability and information IEs */
176         if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
177             chandef->width != NL80211_CHAN_WIDTH_5 &&
178             chandef->width != NL80211_CHAN_WIDTH_10 &&
179             sband->ht_cap.ht_supported) {
180                 struct ieee80211_sta_ht_cap ht_cap;
181
182                 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
183                 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
184
185                 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
186                 /*
187                  * Note: According to 802.11n-2009 9.13.3.1, HT Protection
188                  * field and RIFS Mode are reserved in IBSS mode, therefore
189                  * keep them at 0
190                  */
191                 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
192                                                  chandef, 0, false);
193
194                 /* add VHT capability and information IEs */
195                 if (chandef->width != NL80211_CHAN_WIDTH_20 &&
196                     chandef->width != NL80211_CHAN_WIDTH_40 &&
197                     sband->vht_cap.vht_supported) {
198                         pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
199                                                          sband->vht_cap.cap);
200                         pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap,
201                                                           chandef);
202                 }
203         }
204
205         if (local->hw.queues >= IEEE80211_NUM_ACS)
206                 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */
207
208         presp->head_len = pos - presp->head;
209         if (WARN_ON(presp->head_len > frame_len))
210                 goto error;
211
212         return presp;
213 error:
214         kfree(presp);
215         return NULL;
216 }
217
218 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
219                                       const u8 *bssid, const int beacon_int,
220                                       struct cfg80211_chan_def *req_chandef,
221                                       const u32 basic_rates,
222                                       const u16 capability, u64 tsf,
223                                       bool creator)
224 {
225         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
226         struct ieee80211_local *local = sdata->local;
227         struct ieee80211_mgmt *mgmt;
228         struct cfg80211_bss *bss;
229         u32 bss_change;
230         struct cfg80211_chan_def chandef;
231         struct ieee80211_channel *chan;
232         struct beacon_data *presp;
233         struct cfg80211_inform_bss bss_meta = {};
234         bool have_higher_than_11mbit;
235         bool radar_required;
236         int err;
237
238         sdata_assert_lock(sdata);
239
240         /* Reset own TSF to allow time synchronization work. */
241         drv_reset_tsf(local, sdata);
242
243         if (!ether_addr_equal(ifibss->bssid, bssid))
244                 sta_info_flush(sdata);
245
246         /* if merging, indicate to driver that we leave the old IBSS */
247         if (sdata->vif.bss_conf.ibss_joined) {
248                 sdata->vif.bss_conf.ibss_joined = false;
249                 sdata->vif.bss_conf.ibss_creator = false;
250                 sdata->vif.bss_conf.enable_beacon = false;
251                 netif_carrier_off(sdata->dev);
252                 ieee80211_bss_info_change_notify(sdata,
253                                                  BSS_CHANGED_IBSS |
254                                                  BSS_CHANGED_BEACON_ENABLED);
255                 drv_leave_ibss(local, sdata);
256         }
257
258         presp = rcu_dereference_protected(ifibss->presp,
259                                           lockdep_is_held(&sdata->wdev.mtx));
260         RCU_INIT_POINTER(ifibss->presp, NULL);
261         if (presp)
262                 kfree_rcu(presp, rcu_head);
263
264         /* make a copy of the chandef, it could be modified below. */
265         chandef = *req_chandef;
266         chan = chandef.chan;
267         if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
268                                      NL80211_IFTYPE_ADHOC)) {
269                 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
270                     chandef.width == NL80211_CHAN_WIDTH_10 ||
271                     chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
272                     chandef.width == NL80211_CHAN_WIDTH_20) {
273                         sdata_info(sdata,
274                                    "Failed to join IBSS, beacons forbidden\n");
275                         return;
276                 }
277                 chandef.width = NL80211_CHAN_WIDTH_20;
278                 chandef.center_freq1 = chan->center_freq;
279                 /* check again for downgraded chandef */
280                 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
281                                              NL80211_IFTYPE_ADHOC)) {
282                         sdata_info(sdata,
283                                    "Failed to join IBSS, beacons forbidden\n");
284                         return;
285                 }
286         }
287
288         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
289                                             &chandef, NL80211_IFTYPE_ADHOC);
290         if (err < 0) {
291                 sdata_info(sdata,
292                            "Failed to join IBSS, invalid chandef\n");
293                 return;
294         }
295         if (err > 0 && !ifibss->userspace_handles_dfs) {
296                 sdata_info(sdata,
297                            "Failed to join IBSS, DFS channel without control program\n");
298                 return;
299         }
300
301         radar_required = err;
302
303         mutex_lock(&local->mtx);
304         if (ieee80211_vif_use_channel(sdata, &chandef,
305                                       ifibss->fixed_channel ?
306                                         IEEE80211_CHANCTX_SHARED :
307                                         IEEE80211_CHANCTX_EXCLUSIVE)) {
308                 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
309                 mutex_unlock(&local->mtx);
310                 return;
311         }
312         sdata->radar_required = radar_required;
313         mutex_unlock(&local->mtx);
314
315         memcpy(ifibss->bssid, bssid, ETH_ALEN);
316
317         presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
318                                            capability, tsf, &chandef,
319                                            &have_higher_than_11mbit, NULL);
320         if (!presp)
321                 return;
322
323         rcu_assign_pointer(ifibss->presp, presp);
324         mgmt = (void *)presp->head;
325
326         sdata->vif.bss_conf.enable_beacon = true;
327         sdata->vif.bss_conf.beacon_int = beacon_int;
328         sdata->vif.bss_conf.basic_rates = basic_rates;
329         sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
330         memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
331         bss_change = BSS_CHANGED_BEACON_INT;
332         bss_change |= ieee80211_reset_erp_info(sdata);
333         bss_change |= BSS_CHANGED_BSSID;
334         bss_change |= BSS_CHANGED_BEACON;
335         bss_change |= BSS_CHANGED_BEACON_ENABLED;
336         bss_change |= BSS_CHANGED_BASIC_RATES;
337         bss_change |= BSS_CHANGED_HT;
338         bss_change |= BSS_CHANGED_IBSS;
339         bss_change |= BSS_CHANGED_SSID;
340
341         /*
342          * In 5 GHz/802.11a, we can always use short slot time.
343          * (IEEE 802.11-2012 18.3.8.7)
344          *
345          * In 2.4GHz, we must always use long slots in IBSS for compatibility
346          * reasons.
347          * (IEEE 802.11-2012 19.4.5)
348          *
349          * HT follows these specifications (IEEE 802.11-2012 20.3.18)
350          */
351         sdata->vif.bss_conf.use_short_slot = chan->band == NL80211_BAND_5GHZ;
352         bss_change |= BSS_CHANGED_ERP_SLOT;
353
354         /* cf. IEEE 802.11 9.2.12 */
355         if (chan->band == NL80211_BAND_2GHZ && have_higher_than_11mbit)
356                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
357         else
358                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
359
360         ieee80211_set_wmm_default(sdata, true, false);
361
362         sdata->vif.bss_conf.ibss_joined = true;
363         sdata->vif.bss_conf.ibss_creator = creator;
364
365         err = drv_join_ibss(local, sdata);
366         if (err) {
367                 sdata->vif.bss_conf.ibss_joined = false;
368                 sdata->vif.bss_conf.ibss_creator = false;
369                 sdata->vif.bss_conf.enable_beacon = false;
370                 sdata->vif.bss_conf.ssid_len = 0;
371                 RCU_INIT_POINTER(ifibss->presp, NULL);
372                 kfree_rcu(presp, rcu_head);
373                 mutex_lock(&local->mtx);
374                 ieee80211_vif_release_channel(sdata);
375                 mutex_unlock(&local->mtx);
376                 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
377                            err);
378                 return;
379         }
380
381         ieee80211_bss_info_change_notify(sdata, bss_change);
382
383         ifibss->state = IEEE80211_IBSS_MLME_JOINED;
384         mod_timer(&ifibss->timer,
385                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
386
387         bss_meta.chan = chan;
388         bss_meta.scan_width = cfg80211_chandef_to_scan_width(&chandef);
389         bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt,
390                                              presp->head_len, GFP_KERNEL);
391
392         cfg80211_put_bss(local->hw.wiphy, bss);
393         netif_carrier_on(sdata->dev);
394         cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
395 }
396
397 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
398                                     struct ieee80211_bss *bss)
399 {
400         struct cfg80211_bss *cbss =
401                 container_of((void *)bss, struct cfg80211_bss, priv);
402         struct ieee80211_supported_band *sband;
403         struct cfg80211_chan_def chandef;
404         u32 basic_rates;
405         int i, j;
406         u16 beacon_int = cbss->beacon_interval;
407         const struct cfg80211_bss_ies *ies;
408         enum nl80211_channel_type chan_type;
409         u64 tsf;
410         u32 rate_flags;
411         int shift;
412
413         sdata_assert_lock(sdata);
414
415         if (beacon_int < 10)
416                 beacon_int = 10;
417
418         switch (sdata->u.ibss.chandef.width) {
419         case NL80211_CHAN_WIDTH_20_NOHT:
420         case NL80211_CHAN_WIDTH_20:
421         case NL80211_CHAN_WIDTH_40:
422                 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
423                 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
424                 break;
425         case NL80211_CHAN_WIDTH_5:
426         case NL80211_CHAN_WIDTH_10:
427                 cfg80211_chandef_create(&chandef, cbss->channel,
428                                         NL80211_CHAN_NO_HT);
429                 chandef.width = sdata->u.ibss.chandef.width;
430                 break;
431         case NL80211_CHAN_WIDTH_80:
432         case NL80211_CHAN_WIDTH_80P80:
433         case NL80211_CHAN_WIDTH_160:
434                 chandef = sdata->u.ibss.chandef;
435                 chandef.chan = cbss->channel;
436                 break;
437         default:
438                 /* fall back to 20 MHz for unsupported modes */
439                 cfg80211_chandef_create(&chandef, cbss->channel,
440                                         NL80211_CHAN_NO_HT);
441                 break;
442         }
443
444         sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
445         rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
446         shift = ieee80211_vif_get_shift(&sdata->vif);
447
448         basic_rates = 0;
449
450         for (i = 0; i < bss->supp_rates_len; i++) {
451                 int rate = bss->supp_rates[i] & 0x7f;
452                 bool is_basic = !!(bss->supp_rates[i] & 0x80);
453
454                 for (j = 0; j < sband->n_bitrates; j++) {
455                         int brate;
456                         if ((rate_flags & sband->bitrates[j].flags)
457                             != rate_flags)
458                                 continue;
459
460                         brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
461                                              5 * (1 << shift));
462                         if (brate == rate) {
463                                 if (is_basic)
464                                         basic_rates |= BIT(j);
465                                 break;
466                         }
467                 }
468         }
469
470         rcu_read_lock();
471         ies = rcu_dereference(cbss->ies);
472         tsf = ies->tsf;
473         rcu_read_unlock();
474
475         __ieee80211_sta_join_ibss(sdata, cbss->bssid,
476                                   beacon_int,
477                                   &chandef,
478                                   basic_rates,
479                                   cbss->capability,
480                                   tsf, false);
481 }
482
483 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
484                               struct cfg80211_csa_settings *csa_settings)
485 {
486         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
487         struct beacon_data *presp, *old_presp;
488         struct cfg80211_bss *cbss;
489         const struct cfg80211_bss_ies *ies;
490         u16 capability = WLAN_CAPABILITY_IBSS;
491         u64 tsf;
492         int ret = 0;
493
494         sdata_assert_lock(sdata);
495
496         if (ifibss->privacy)
497                 capability |= WLAN_CAPABILITY_PRIVACY;
498
499         cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
500                                 ifibss->bssid, ifibss->ssid,
501                                 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS,
502                                 IEEE80211_PRIVACY(ifibss->privacy));
503
504         if (WARN_ON(!cbss)) {
505                 ret = -EINVAL;
506                 goto out;
507         }
508
509         rcu_read_lock();
510         ies = rcu_dereference(cbss->ies);
511         tsf = ies->tsf;
512         rcu_read_unlock();
513         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
514
515         old_presp = rcu_dereference_protected(ifibss->presp,
516                                           lockdep_is_held(&sdata->wdev.mtx));
517
518         presp = ieee80211_ibss_build_presp(sdata,
519                                            sdata->vif.bss_conf.beacon_int,
520                                            sdata->vif.bss_conf.basic_rates,
521                                            capability, tsf, &ifibss->chandef,
522                                            NULL, csa_settings);
523         if (!presp) {
524                 ret = -ENOMEM;
525                 goto out;
526         }
527
528         rcu_assign_pointer(ifibss->presp, presp);
529         if (old_presp)
530                 kfree_rcu(old_presp, rcu_head);
531
532         return BSS_CHANGED_BEACON;
533  out:
534         return ret;
535 }
536
537 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
538 {
539         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
540         struct cfg80211_bss *cbss;
541         int err, changed = 0;
542
543         sdata_assert_lock(sdata);
544
545         /* update cfg80211 bss information with the new channel */
546         if (!is_zero_ether_addr(ifibss->bssid)) {
547                 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
548                                         ifibss->chandef.chan,
549                                         ifibss->bssid, ifibss->ssid,
550                                         ifibss->ssid_len,
551                                         IEEE80211_BSS_TYPE_IBSS,
552                                         IEEE80211_PRIVACY(ifibss->privacy));
553                 /* XXX: should not really modify cfg80211 data */
554                 if (cbss) {
555                         cbss->channel = sdata->csa_chandef.chan;
556                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
557                 }
558         }
559
560         ifibss->chandef = sdata->csa_chandef;
561
562         /* generate the beacon */
563         err = ieee80211_ibss_csa_beacon(sdata, NULL);
564         if (err < 0)
565                 return err;
566
567         changed |= err;
568
569         return changed;
570 }
571
572 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
573 {
574         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
575
576         cancel_work_sync(&ifibss->csa_connection_drop_work);
577 }
578
579 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
580         __acquires(RCU)
581 {
582         struct ieee80211_sub_if_data *sdata = sta->sdata;
583         u8 addr[ETH_ALEN];
584
585         memcpy(addr, sta->sta.addr, ETH_ALEN);
586
587         ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
588
589         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
590         sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
591         /* authorize the station only if the network is not RSN protected. If
592          * not wait for the userspace to authorize it */
593         if (!sta->sdata->u.ibss.control_port)
594                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
595
596         rate_control_rate_init(sta);
597
598         /* If it fails, maybe we raced another insertion? */
599         if (sta_info_insert_rcu(sta))
600                 return sta_info_get(sdata, addr);
601         return sta;
602 }
603
604 static struct sta_info *
605 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
606                        const u8 *addr, u32 supp_rates)
607         __acquires(RCU)
608 {
609         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
610         struct ieee80211_local *local = sdata->local;
611         struct sta_info *sta;
612         struct ieee80211_chanctx_conf *chanctx_conf;
613         struct ieee80211_supported_band *sband;
614         enum nl80211_bss_scan_width scan_width;
615         int band;
616
617         /*
618          * XXX: Consider removing the least recently used entry and
619          *      allow new one to be added.
620          */
621         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
622                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
623                                     sdata->name, addr);
624                 rcu_read_lock();
625                 return NULL;
626         }
627
628         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
629                 rcu_read_lock();
630                 return NULL;
631         }
632
633         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
634                 rcu_read_lock();
635                 return NULL;
636         }
637
638         rcu_read_lock();
639         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
640         if (WARN_ON_ONCE(!chanctx_conf))
641                 return NULL;
642         band = chanctx_conf->def.chan->band;
643         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
644         rcu_read_unlock();
645
646         sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
647         if (!sta) {
648                 rcu_read_lock();
649                 return NULL;
650         }
651
652         /* make sure mandatory rates are always added */
653         sband = local->hw.wiphy->bands[band];
654         sta->sta.supp_rates[band] = supp_rates |
655                         ieee80211_mandatory_rates(sband, scan_width);
656
657         return ieee80211_ibss_finish_sta(sta);
658 }
659
660 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
661 {
662         struct ieee80211_local *local = sdata->local;
663         int active = 0;
664         struct sta_info *sta;
665
666         sdata_assert_lock(sdata);
667
668         rcu_read_lock();
669
670         list_for_each_entry_rcu(sta, &local->sta_list, list) {
671                 unsigned long last_active = ieee80211_sta_last_active(sta);
672
673                 if (sta->sdata == sdata &&
674                     time_is_after_jiffies(last_active +
675                                           IEEE80211_IBSS_MERGE_INTERVAL)) {
676                         active++;
677                         break;
678                 }
679         }
680
681         rcu_read_unlock();
682
683         return active;
684 }
685
686 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
687 {
688         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
689         struct ieee80211_local *local = sdata->local;
690         struct cfg80211_bss *cbss;
691         struct beacon_data *presp;
692         struct sta_info *sta;
693
694         if (!is_zero_ether_addr(ifibss->bssid)) {
695                 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
696                                         ifibss->bssid, ifibss->ssid,
697                                         ifibss->ssid_len,
698                                         IEEE80211_BSS_TYPE_IBSS,
699                                         IEEE80211_PRIVACY(ifibss->privacy));
700
701                 if (cbss) {
702                         cfg80211_unlink_bss(local->hw.wiphy, cbss);
703                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
704                 }
705         }
706
707         ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
708
709         sta_info_flush(sdata);
710
711         spin_lock_bh(&ifibss->incomplete_lock);
712         while (!list_empty(&ifibss->incomplete_stations)) {
713                 sta = list_first_entry(&ifibss->incomplete_stations,
714                                        struct sta_info, list);
715                 list_del(&sta->list);
716                 spin_unlock_bh(&ifibss->incomplete_lock);
717
718                 sta_info_free(local, sta);
719                 spin_lock_bh(&ifibss->incomplete_lock);
720         }
721         spin_unlock_bh(&ifibss->incomplete_lock);
722
723         netif_carrier_off(sdata->dev);
724
725         sdata->vif.bss_conf.ibss_joined = false;
726         sdata->vif.bss_conf.ibss_creator = false;
727         sdata->vif.bss_conf.enable_beacon = false;
728         sdata->vif.bss_conf.ssid_len = 0;
729
730         /* remove beacon */
731         presp = rcu_dereference_protected(ifibss->presp,
732                                           lockdep_is_held(&sdata->wdev.mtx));
733         RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
734         if (presp)
735                 kfree_rcu(presp, rcu_head);
736
737         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
738         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
739                                                 BSS_CHANGED_IBSS);
740         drv_leave_ibss(local, sdata);
741         mutex_lock(&local->mtx);
742         ieee80211_vif_release_channel(sdata);
743         mutex_unlock(&local->mtx);
744 }
745
746 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
747 {
748         struct ieee80211_sub_if_data *sdata =
749                 container_of(work, struct ieee80211_sub_if_data,
750                              u.ibss.csa_connection_drop_work);
751
752         sdata_lock(sdata);
753
754         ieee80211_ibss_disconnect(sdata);
755         synchronize_rcu();
756         skb_queue_purge(&sdata->skb_queue);
757
758         /* trigger a scan to find another IBSS network to join */
759         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
760
761         sdata_unlock(sdata);
762 }
763
764 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
765 {
766         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
767         int err;
768
769         /* if the current channel is a DFS channel, mark the channel as
770          * unavailable.
771          */
772         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
773                                             &ifibss->chandef,
774                                             NL80211_IFTYPE_ADHOC);
775         if (err > 0)
776                 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
777                                      GFP_ATOMIC);
778 }
779
780 static bool
781 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
782                                   struct ieee802_11_elems *elems,
783                                   bool beacon)
784 {
785         struct cfg80211_csa_settings params;
786         struct ieee80211_csa_ie csa_ie;
787         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
788         enum nl80211_channel_type ch_type;
789         int err;
790         u32 sta_flags;
791
792         sdata_assert_lock(sdata);
793
794         sta_flags = IEEE80211_STA_DISABLE_VHT;
795         switch (ifibss->chandef.width) {
796         case NL80211_CHAN_WIDTH_5:
797         case NL80211_CHAN_WIDTH_10:
798         case NL80211_CHAN_WIDTH_20_NOHT:
799                 sta_flags |= IEEE80211_STA_DISABLE_HT;
800                 /* fall through */
801         case NL80211_CHAN_WIDTH_20:
802                 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
803                 break;
804         default:
805                 break;
806         }
807
808         memset(&params, 0, sizeof(params));
809         memset(&csa_ie, 0, sizeof(csa_ie));
810         err = ieee80211_parse_ch_switch_ie(sdata, elems,
811                                            ifibss->chandef.chan->band,
812                                            sta_flags, ifibss->bssid, &csa_ie);
813         /* can't switch to destination channel, fail */
814         if (err < 0)
815                 goto disconnect;
816
817         /* did not contain a CSA */
818         if (err)
819                 return false;
820
821         /* channel switch is not supported, disconnect */
822         if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
823                 goto disconnect;
824
825         params.count = csa_ie.count;
826         params.chandef = csa_ie.chandef;
827
828         switch (ifibss->chandef.width) {
829         case NL80211_CHAN_WIDTH_20_NOHT:
830         case NL80211_CHAN_WIDTH_20:
831         case NL80211_CHAN_WIDTH_40:
832                 /* keep our current HT mode (HT20/HT40+/HT40-), even if
833                  * another mode  has been announced. The mode is not adopted
834                  * within the beacon while doing CSA and we should therefore
835                  * keep the mode which we announce.
836                  */
837                 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
838                 cfg80211_chandef_create(&params.chandef, params.chandef.chan,
839                                         ch_type);
840                 break;
841         case NL80211_CHAN_WIDTH_5:
842         case NL80211_CHAN_WIDTH_10:
843                 if (params.chandef.width != ifibss->chandef.width) {
844                         sdata_info(sdata,
845                                    "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
846                                    ifibss->bssid,
847                                    params.chandef.chan->center_freq,
848                                    params.chandef.width,
849                                    params.chandef.center_freq1,
850                                    params.chandef.center_freq2);
851                         goto disconnect;
852                 }
853                 break;
854         default:
855                 /* should not happen, sta_flags should prevent VHT modes. */
856                 WARN_ON(1);
857                 goto disconnect;
858         }
859
860         if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
861                                      NL80211_IFTYPE_ADHOC)) {
862                 sdata_info(sdata,
863                            "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
864                            ifibss->bssid,
865                            params.chandef.chan->center_freq,
866                            params.chandef.width,
867                            params.chandef.center_freq1,
868                            params.chandef.center_freq2);
869                 goto disconnect;
870         }
871
872         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
873                                             &params.chandef,
874                                             NL80211_IFTYPE_ADHOC);
875         if (err < 0)
876                 goto disconnect;
877         if (err > 0 && !ifibss->userspace_handles_dfs) {
878                 /* IBSS-DFS only allowed with a control program */
879                 goto disconnect;
880         }
881
882         params.radar_required = err;
883
884         if (cfg80211_chandef_identical(&params.chandef,
885                                        &sdata->vif.bss_conf.chandef)) {
886                 ibss_dbg(sdata,
887                          "received csa with an identical chandef, ignoring\n");
888                 return true;
889         }
890
891         /* all checks done, now perform the channel switch. */
892         ibss_dbg(sdata,
893                  "received channel switch announcement to go to channel %d MHz\n",
894                  params.chandef.chan->center_freq);
895
896         params.block_tx = !!csa_ie.mode;
897
898         if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
899                                      &params))
900                 goto disconnect;
901
902         ieee80211_ibss_csa_mark_radar(sdata);
903
904         return true;
905 disconnect:
906         ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
907         ieee80211_queue_work(&sdata->local->hw,
908                              &ifibss->csa_connection_drop_work);
909
910         ieee80211_ibss_csa_mark_radar(sdata);
911
912         return true;
913 }
914
915 static void
916 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
917                                 struct ieee80211_mgmt *mgmt, size_t len,
918                                 struct ieee80211_rx_status *rx_status,
919                                 struct ieee802_11_elems *elems)
920 {
921         int required_len;
922
923         if (len < IEEE80211_MIN_ACTION_SIZE + 1)
924                 return;
925
926         /* CSA is the only action we handle for now */
927         if (mgmt->u.action.u.measurement.action_code !=
928             WLAN_ACTION_SPCT_CHL_SWITCH)
929                 return;
930
931         required_len = IEEE80211_MIN_ACTION_SIZE +
932                        sizeof(mgmt->u.action.u.chan_switch);
933         if (len < required_len)
934                 return;
935
936         if (!sdata->vif.csa_active)
937                 ieee80211_ibss_process_chanswitch(sdata, elems, false);
938 }
939
940 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
941                                           struct ieee80211_mgmt *mgmt,
942                                           size_t len)
943 {
944         u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
945
946         if (len < IEEE80211_DEAUTH_FRAME_LEN)
947                 return;
948
949         ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
950                  mgmt->sa, mgmt->da, mgmt->bssid, reason);
951         sta_info_destroy_addr(sdata, mgmt->sa);
952 }
953
954 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
955                                         struct ieee80211_mgmt *mgmt,
956                                         size_t len)
957 {
958         u16 auth_alg, auth_transaction;
959
960         sdata_assert_lock(sdata);
961
962         if (len < 24 + 6)
963                 return;
964
965         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
966         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
967
968         ibss_dbg(sdata,
969                  "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
970                  mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
971
972         if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
973                 return;
974
975         /*
976          * IEEE 802.11 standard does not require authentication in IBSS
977          * networks and most implementations do not seem to use it.
978          * However, try to reply to authentication attempts if someone
979          * has actually implemented this.
980          */
981         ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
982                             mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
983 }
984
985 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
986                                       struct ieee80211_mgmt *mgmt, size_t len,
987                                       struct ieee80211_rx_status *rx_status,
988                                       struct ieee802_11_elems *elems,
989                                       struct ieee80211_channel *channel)
990 {
991         struct sta_info *sta;
992         enum nl80211_band band = rx_status->band;
993         enum nl80211_bss_scan_width scan_width;
994         struct ieee80211_local *local = sdata->local;
995         struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
996         bool rates_updated = false;
997         u32 supp_rates = 0;
998
999         if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1000                 return;
1001
1002         if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
1003                 return;
1004
1005         rcu_read_lock();
1006         sta = sta_info_get(sdata, mgmt->sa);
1007
1008         if (elems->supp_rates) {
1009                 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1010                                                      band, NULL);
1011                 if (sta) {
1012                         u32 prev_rates;
1013
1014                         prev_rates = sta->sta.supp_rates[band];
1015                         /* make sure mandatory rates are always added */
1016                         scan_width = NL80211_BSS_CHAN_WIDTH_20;
1017                         if (rx_status->flag & RX_FLAG_5MHZ)
1018                                 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1019                         if (rx_status->flag & RX_FLAG_10MHZ)
1020                                 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1021
1022                         sta->sta.supp_rates[band] = supp_rates |
1023                                 ieee80211_mandatory_rates(sband, scan_width);
1024                         if (sta->sta.supp_rates[band] != prev_rates) {
1025                                 ibss_dbg(sdata,
1026                                          "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1027                                          sta->sta.addr, prev_rates,
1028                                          sta->sta.supp_rates[band]);
1029                                 rates_updated = true;
1030                         }
1031                 } else {
1032                         rcu_read_unlock();
1033                         sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1034                                                      mgmt->sa, supp_rates);
1035                 }
1036         }
1037
1038         if (sta && !sta->sta.wme &&
1039             elems->wmm_info && local->hw.queues >= IEEE80211_NUM_ACS) {
1040                 sta->sta.wme = true;
1041                 ieee80211_check_fast_xmit(sta);
1042         }
1043
1044         if (sta && elems->ht_operation && elems->ht_cap_elem &&
1045             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1046             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1047             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1048                 /* we both use HT */
1049                 struct ieee80211_ht_cap htcap_ie;
1050                 struct cfg80211_chan_def chandef;
1051                 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
1052
1053                 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT);
1054                 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef);
1055
1056                 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1057                 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1058                                                                    &htcap_ie,
1059                                                                    sta);
1060
1061                 if (elems->vht_operation && elems->vht_cap_elem &&
1062                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1063                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1064                         /* we both use VHT */
1065                         struct ieee80211_vht_cap cap_ie;
1066                         struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap;
1067
1068                         ieee80211_chandef_vht_oper(elems->vht_operation,
1069                                                    &chandef);
1070                         memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1071                         ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1072                                                             &cap_ie, sta);
1073                         if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap)))
1074                                 rates_updated |= true;
1075                 }
1076
1077                 if (bw != sta->sta.bandwidth)
1078                         rates_updated |= true;
1079
1080                 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1081                                                  &chandef))
1082                         WARN_ON_ONCE(1);
1083         }
1084
1085         if (sta && rates_updated) {
1086                 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1087                 u8 rx_nss = sta->sta.rx_nss;
1088
1089                 /* Force rx_nss recalculation */
1090                 sta->sta.rx_nss = 0;
1091                 rate_control_rate_init(sta);
1092                 if (sta->sta.rx_nss != rx_nss)
1093                         changed |= IEEE80211_RC_NSS_CHANGED;
1094
1095                 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1096         }
1097
1098         rcu_read_unlock();
1099 }
1100
1101 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1102                                   struct ieee80211_mgmt *mgmt, size_t len,
1103                                   struct ieee80211_rx_status *rx_status,
1104                                   struct ieee802_11_elems *elems)
1105 {
1106         struct ieee80211_local *local = sdata->local;
1107         struct cfg80211_bss *cbss;
1108         struct ieee80211_bss *bss;
1109         struct ieee80211_channel *channel;
1110         u64 beacon_timestamp, rx_timestamp;
1111         u32 supp_rates = 0;
1112         enum nl80211_band band = rx_status->band;
1113
1114         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1115         if (!channel)
1116                 return;
1117
1118         ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1119
1120         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1121                                         channel);
1122         if (!bss)
1123                 return;
1124
1125         cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1126
1127         /* same for beacon and probe response */
1128         beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1129
1130         /* check if we need to merge IBSS */
1131
1132         /* not an IBSS */
1133         if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1134                 goto put_bss;
1135
1136         /* different channel */
1137         if (sdata->u.ibss.fixed_channel &&
1138             sdata->u.ibss.chandef.chan != cbss->channel)
1139                 goto put_bss;
1140
1141         /* different SSID */
1142         if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1143             memcmp(elems->ssid, sdata->u.ibss.ssid,
1144                                 sdata->u.ibss.ssid_len))
1145                 goto put_bss;
1146
1147         /* process channel switch */
1148         if (sdata->vif.csa_active ||
1149             ieee80211_ibss_process_chanswitch(sdata, elems, true))
1150                 goto put_bss;
1151
1152         /* same BSSID */
1153         if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1154                 goto put_bss;
1155
1156         /* we use a fixed BSSID */
1157         if (sdata->u.ibss.fixed_bssid)
1158                 goto put_bss;
1159
1160         if (ieee80211_have_rx_timestamp(rx_status)) {
1161                 /* time when timestamp field was received */
1162                 rx_timestamp =
1163                         ieee80211_calculate_rx_timestamp(local, rx_status,
1164                                                          len + FCS_LEN, 24);
1165         } else {
1166                 /*
1167                  * second best option: get current TSF
1168                  * (will return -1 if not supported)
1169                  */
1170                 rx_timestamp = drv_get_tsf(local, sdata);
1171         }
1172
1173         ibss_dbg(sdata,
1174                  "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1175                  mgmt->sa, mgmt->bssid,
1176                  (unsigned long long)rx_timestamp,
1177                  (unsigned long long)beacon_timestamp,
1178                  (unsigned long long)(rx_timestamp - beacon_timestamp),
1179                  jiffies);
1180
1181         if (beacon_timestamp > rx_timestamp) {
1182                 ibss_dbg(sdata,
1183                          "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1184                          mgmt->bssid);
1185                 ieee80211_sta_join_ibss(sdata, bss);
1186                 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1187                 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1188                                        supp_rates);
1189                 rcu_read_unlock();
1190         }
1191
1192  put_bss:
1193         ieee80211_rx_bss_put(local, bss);
1194 }
1195
1196 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1197                               const u8 *bssid, const u8 *addr,
1198                               u32 supp_rates)
1199 {
1200         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1201         struct ieee80211_local *local = sdata->local;
1202         struct sta_info *sta;
1203         struct ieee80211_chanctx_conf *chanctx_conf;
1204         struct ieee80211_supported_band *sband;
1205         enum nl80211_bss_scan_width scan_width;
1206         int band;
1207
1208         /*
1209          * XXX: Consider removing the least recently used entry and
1210          *      allow new one to be added.
1211          */
1212         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1213                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1214                                     sdata->name, addr);
1215                 return;
1216         }
1217
1218         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1219                 return;
1220
1221         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1222                 return;
1223
1224         rcu_read_lock();
1225         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1226         if (WARN_ON_ONCE(!chanctx_conf)) {
1227                 rcu_read_unlock();
1228                 return;
1229         }
1230         band = chanctx_conf->def.chan->band;
1231         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1232         rcu_read_unlock();
1233
1234         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1235         if (!sta)
1236                 return;
1237
1238         /* make sure mandatory rates are always added */
1239         sband = local->hw.wiphy->bands[band];
1240         sta->sta.supp_rates[band] = supp_rates |
1241                         ieee80211_mandatory_rates(sband, scan_width);
1242
1243         spin_lock(&ifibss->incomplete_lock);
1244         list_add(&sta->list, &ifibss->incomplete_stations);
1245         spin_unlock(&ifibss->incomplete_lock);
1246         ieee80211_queue_work(&local->hw, &sdata->work);
1247 }
1248
1249 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1250 {
1251         struct ieee80211_local *local = sdata->local;
1252         struct sta_info *sta, *tmp;
1253         unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1254         unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1255
1256         mutex_lock(&local->sta_mtx);
1257
1258         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1259                 unsigned long last_active = ieee80211_sta_last_active(sta);
1260
1261                 if (sdata != sta->sdata)
1262                         continue;
1263
1264                 if (time_is_before_jiffies(last_active + exp_time) ||
1265                     (time_is_before_jiffies(last_active + exp_rsn) &&
1266                      sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1267                         sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1268                                 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1269                                 "not authorized " : "", sta->sta.addr);
1270
1271                         WARN_ON(__sta_info_destroy(sta));
1272                 }
1273         }
1274
1275         mutex_unlock(&local->sta_mtx);
1276 }
1277
1278 /*
1279  * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1280  */
1281
1282 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1283 {
1284         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1285         enum nl80211_bss_scan_width scan_width;
1286
1287         sdata_assert_lock(sdata);
1288
1289         mod_timer(&ifibss->timer,
1290                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1291
1292         ieee80211_ibss_sta_expire(sdata);
1293
1294         if (time_before(jiffies, ifibss->last_scan_completed +
1295                        IEEE80211_IBSS_MERGE_INTERVAL))
1296                 return;
1297
1298         if (ieee80211_sta_active_ibss(sdata))
1299                 return;
1300
1301         if (ifibss->fixed_channel)
1302                 return;
1303
1304         sdata_info(sdata,
1305                    "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1306
1307         scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1308         ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1309                                     NULL, 0, scan_width);
1310 }
1311
1312 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1313 {
1314         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1315         u8 bssid[ETH_ALEN];
1316         u16 capability;
1317         int i;
1318
1319         sdata_assert_lock(sdata);
1320
1321         if (ifibss->fixed_bssid) {
1322                 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1323         } else {
1324                 /* Generate random, not broadcast, locally administered BSSID. Mix in
1325                  * own MAC address to make sure that devices that do not have proper
1326                  * random number generator get different BSSID. */
1327                 get_random_bytes(bssid, ETH_ALEN);
1328                 for (i = 0; i < ETH_ALEN; i++)
1329                         bssid[i] ^= sdata->vif.addr[i];
1330                 bssid[0] &= ~0x01;
1331                 bssid[0] |= 0x02;
1332         }
1333
1334         sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1335
1336         capability = WLAN_CAPABILITY_IBSS;
1337
1338         if (ifibss->privacy)
1339                 capability |= WLAN_CAPABILITY_PRIVACY;
1340
1341         __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1342                                   &ifibss->chandef, ifibss->basic_rates,
1343                                   capability, 0, true);
1344 }
1345
1346 static unsigned ibss_setup_channels(struct wiphy *wiphy,
1347                                     struct ieee80211_channel **channels,
1348                                     unsigned int channels_max,
1349                                     u32 center_freq, u32 width)
1350 {
1351         struct ieee80211_channel *chan = NULL;
1352         unsigned int n_chan = 0;
1353         u32 start_freq, end_freq, freq;
1354
1355         if (width <= 20) {
1356                 start_freq = center_freq;
1357                 end_freq = center_freq;
1358         } else {
1359                 start_freq = center_freq - width / 2 + 10;
1360                 end_freq = center_freq + width / 2 - 10;
1361         }
1362
1363         for (freq = start_freq; freq <= end_freq; freq += 20) {
1364                 chan = ieee80211_get_channel(wiphy, freq);
1365                 if (!chan)
1366                         continue;
1367                 if (n_chan >= channels_max)
1368                         return n_chan;
1369
1370                 channels[n_chan] = chan;
1371                 n_chan++;
1372         }
1373
1374         return n_chan;
1375 }
1376
1377 static unsigned int
1378 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1379                                    const struct cfg80211_chan_def *chandef,
1380                                    struct ieee80211_channel **channels,
1381                                    unsigned int channels_max)
1382 {
1383         unsigned int n_chan = 0;
1384         u32 width, cf1, cf2 = 0;
1385
1386         switch (chandef->width) {
1387         case NL80211_CHAN_WIDTH_40:
1388                 width = 40;
1389                 break;
1390         case NL80211_CHAN_WIDTH_80P80:
1391                 cf2 = chandef->center_freq2;
1392                 /* fall through */
1393         case NL80211_CHAN_WIDTH_80:
1394                 width = 80;
1395                 break;
1396         case NL80211_CHAN_WIDTH_160:
1397                 width = 160;
1398                 break;
1399         default:
1400                 width = 20;
1401                 break;
1402         }
1403
1404         cf1 = chandef->center_freq1;
1405
1406         n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1407
1408         if (cf2)
1409                 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1410                                               channels_max - n_chan, cf2,
1411                                               width);
1412
1413         return n_chan;
1414 }
1415
1416 /*
1417  * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1418  */
1419
1420 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1421 {
1422         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1423         struct ieee80211_local *local = sdata->local;
1424         struct cfg80211_bss *cbss;
1425         struct ieee80211_channel *chan = NULL;
1426         const u8 *bssid = NULL;
1427         enum nl80211_bss_scan_width scan_width;
1428         int active_ibss;
1429
1430         sdata_assert_lock(sdata);
1431
1432         active_ibss = ieee80211_sta_active_ibss(sdata);
1433         ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1434
1435         if (active_ibss)
1436                 return;
1437
1438         if (ifibss->fixed_bssid)
1439                 bssid = ifibss->bssid;
1440         if (ifibss->fixed_channel)
1441                 chan = ifibss->chandef.chan;
1442         if (!is_zero_ether_addr(ifibss->bssid))
1443                 bssid = ifibss->bssid;
1444         cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1445                                 ifibss->ssid, ifibss->ssid_len,
1446                                 IEEE80211_BSS_TYPE_IBSS,
1447                                 IEEE80211_PRIVACY(ifibss->privacy));
1448
1449         if (cbss) {
1450                 struct ieee80211_bss *bss;
1451
1452                 bss = (void *)cbss->priv;
1453                 ibss_dbg(sdata,
1454                          "sta_find_ibss: selected %pM current %pM\n",
1455                          cbss->bssid, ifibss->bssid);
1456                 sdata_info(sdata,
1457                            "Selected IBSS BSSID %pM based on configured SSID\n",
1458                            cbss->bssid);
1459
1460                 ieee80211_sta_join_ibss(sdata, bss);
1461                 ieee80211_rx_bss_put(local, bss);
1462                 return;
1463         }
1464
1465         /* if a fixed bssid and a fixed freq have been provided create the IBSS
1466          * directly and do not waste time scanning
1467          */
1468         if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1469                 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1470                            bssid);
1471                 ieee80211_sta_create_ibss(sdata);
1472                 return;
1473         }
1474
1475
1476         ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1477
1478         /* Selected IBSS not found in current scan results - try to scan */
1479         if (time_after(jiffies, ifibss->last_scan_completed +
1480                                         IEEE80211_SCAN_INTERVAL)) {
1481                 struct ieee80211_channel *channels[8];
1482                 unsigned int num;
1483
1484                 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1485
1486                 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1487
1488                 if (ifibss->fixed_channel) {
1489                         num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1490                                                                  &ifibss->chandef,
1491                                                                  channels,
1492                                                                  ARRAY_SIZE(channels));
1493                         ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1494                                                     ifibss->ssid_len, channels,
1495                                                     num, scan_width);
1496                 } else {
1497                         ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1498                                                     ifibss->ssid_len, NULL,
1499                                                     0, scan_width);
1500                 }
1501         } else {
1502                 int interval = IEEE80211_SCAN_INTERVAL;
1503
1504                 if (time_after(jiffies, ifibss->ibss_join_req +
1505                                IEEE80211_IBSS_JOIN_TIMEOUT))
1506                         ieee80211_sta_create_ibss(sdata);
1507
1508                 mod_timer(&ifibss->timer,
1509                           round_jiffies(jiffies + interval));
1510         }
1511 }
1512
1513 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1514                                         struct sk_buff *req)
1515 {
1516         struct ieee80211_mgmt *mgmt = (void *)req->data;
1517         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1518         struct ieee80211_local *local = sdata->local;
1519         int tx_last_beacon, len = req->len;
1520         struct sk_buff *skb;
1521         struct beacon_data *presp;
1522         u8 *pos, *end;
1523
1524         sdata_assert_lock(sdata);
1525
1526         presp = rcu_dereference_protected(ifibss->presp,
1527                                           lockdep_is_held(&sdata->wdev.mtx));
1528
1529         if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1530             len < 24 + 2 || !presp)
1531                 return;
1532
1533         tx_last_beacon = drv_tx_last_beacon(local);
1534
1535         ibss_dbg(sdata,
1536                  "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
1537                  mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
1538
1539         if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1540                 return;
1541
1542         if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1543             !is_broadcast_ether_addr(mgmt->bssid))
1544                 return;
1545
1546         end = ((u8 *) mgmt) + len;
1547         pos = mgmt->u.probe_req.variable;
1548         if (pos[0] != WLAN_EID_SSID ||
1549             pos + 2 + pos[1] > end) {
1550                 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1551                          mgmt->sa);
1552                 return;
1553         }
1554         if (pos[1] != 0 &&
1555             (pos[1] != ifibss->ssid_len ||
1556              memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1557                 /* Ignore ProbeReq for foreign SSID */
1558                 return;
1559         }
1560
1561         /* Reply with ProbeResp */
1562         skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1563         if (!skb)
1564                 return;
1565
1566         skb_reserve(skb, local->tx_headroom);
1567         memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
1568
1569         memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1570         ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1571         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1572
1573         /* avoid excessive retries for probe request to wildcard SSIDs */
1574         if (pos[1] == 0)
1575                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1576
1577         ieee80211_tx_skb(sdata, skb);
1578 }
1579
1580 static
1581 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1582                                     struct ieee80211_mgmt *mgmt, size_t len,
1583                                     struct ieee80211_rx_status *rx_status)
1584 {
1585         size_t baselen;
1586         struct ieee802_11_elems elems;
1587
1588         BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1589                      offsetof(typeof(mgmt->u.beacon), variable));
1590
1591         /*
1592          * either beacon or probe_resp but the variable field is at the
1593          * same offset
1594          */
1595         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1596         if (baselen > len)
1597                 return;
1598
1599         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1600                                false, &elems);
1601
1602         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1603 }
1604
1605 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1606                                    struct sk_buff *skb)
1607 {
1608         struct ieee80211_rx_status *rx_status;
1609         struct ieee80211_mgmt *mgmt;
1610         u16 fc;
1611         struct ieee802_11_elems elems;
1612         int ies_len;
1613
1614         rx_status = IEEE80211_SKB_RXCB(skb);
1615         mgmt = (struct ieee80211_mgmt *) skb->data;
1616         fc = le16_to_cpu(mgmt->frame_control);
1617
1618         sdata_lock(sdata);
1619
1620         if (!sdata->u.ibss.ssid_len)
1621                 goto mgmt_out; /* not ready to merge yet */
1622
1623         switch (fc & IEEE80211_FCTL_STYPE) {
1624         case IEEE80211_STYPE_PROBE_REQ:
1625                 ieee80211_rx_mgmt_probe_req(sdata, skb);
1626                 break;
1627         case IEEE80211_STYPE_PROBE_RESP:
1628         case IEEE80211_STYPE_BEACON:
1629                 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1630                                                rx_status);
1631                 break;
1632         case IEEE80211_STYPE_AUTH:
1633                 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1634                 break;
1635         case IEEE80211_STYPE_DEAUTH:
1636                 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1637                 break;
1638         case IEEE80211_STYPE_ACTION:
1639                 switch (mgmt->u.action.category) {
1640                 case WLAN_CATEGORY_SPECTRUM_MGMT:
1641                         ies_len = skb->len -
1642                                   offsetof(struct ieee80211_mgmt,
1643                                            u.action.u.chan_switch.variable);
1644
1645                         if (ies_len < 0)
1646                                 break;
1647
1648                         ieee802_11_parse_elems(
1649                                 mgmt->u.action.u.chan_switch.variable,
1650                                 ies_len, true, &elems);
1651
1652                         if (elems.parse_error)
1653                                 break;
1654
1655                         ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1656                                                         rx_status, &elems);
1657                         break;
1658                 }
1659         }
1660
1661  mgmt_out:
1662         sdata_unlock(sdata);
1663 }
1664
1665 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1666 {
1667         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1668         struct sta_info *sta;
1669
1670         sdata_lock(sdata);
1671
1672         /*
1673          * Work could be scheduled after scan or similar
1674          * when we aren't even joined (or trying) with a
1675          * network.
1676          */
1677         if (!ifibss->ssid_len)
1678                 goto out;
1679
1680         spin_lock_bh(&ifibss->incomplete_lock);
1681         while (!list_empty(&ifibss->incomplete_stations)) {
1682                 sta = list_first_entry(&ifibss->incomplete_stations,
1683                                        struct sta_info, list);
1684                 list_del(&sta->list);
1685                 spin_unlock_bh(&ifibss->incomplete_lock);
1686
1687                 ieee80211_ibss_finish_sta(sta);
1688                 rcu_read_unlock();
1689                 spin_lock_bh(&ifibss->incomplete_lock);
1690         }
1691         spin_unlock_bh(&ifibss->incomplete_lock);
1692
1693         switch (ifibss->state) {
1694         case IEEE80211_IBSS_MLME_SEARCH:
1695                 ieee80211_sta_find_ibss(sdata);
1696                 break;
1697         case IEEE80211_IBSS_MLME_JOINED:
1698                 ieee80211_sta_merge_ibss(sdata);
1699                 break;
1700         default:
1701                 WARN_ON(1);
1702                 break;
1703         }
1704
1705  out:
1706         sdata_unlock(sdata);
1707 }
1708
1709 static void ieee80211_ibss_timer(unsigned long data)
1710 {
1711         struct ieee80211_sub_if_data *sdata =
1712                 (struct ieee80211_sub_if_data *) data;
1713
1714         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1715 }
1716
1717 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1718 {
1719         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1720
1721         setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1722                     (unsigned long) sdata);
1723         INIT_LIST_HEAD(&ifibss->incomplete_stations);
1724         spin_lock_init(&ifibss->incomplete_lock);
1725         INIT_WORK(&ifibss->csa_connection_drop_work,
1726                   ieee80211_csa_connection_drop_work);
1727 }
1728
1729 /* scan finished notification */
1730 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1731 {
1732         struct ieee80211_sub_if_data *sdata;
1733
1734         mutex_lock(&local->iflist_mtx);
1735         list_for_each_entry(sdata, &local->interfaces, list) {
1736                 if (!ieee80211_sdata_running(sdata))
1737                         continue;
1738                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1739                         continue;
1740                 sdata->u.ibss.last_scan_completed = jiffies;
1741         }
1742         mutex_unlock(&local->iflist_mtx);
1743 }
1744
1745 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1746                         struct cfg80211_ibss_params *params)
1747 {
1748         u32 changed = 0;
1749         u32 rate_flags;
1750         struct ieee80211_supported_band *sband;
1751         enum ieee80211_chanctx_mode chanmode;
1752         struct ieee80211_local *local = sdata->local;
1753         int radar_detect_width = 0;
1754         int i;
1755         int ret;
1756
1757         ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1758                                             &params->chandef,
1759                                             sdata->wdev.iftype);
1760         if (ret < 0)
1761                 return ret;
1762
1763         if (ret > 0) {
1764                 if (!params->userspace_handles_dfs)
1765                         return -EINVAL;
1766                 radar_detect_width = BIT(params->chandef.width);
1767         }
1768
1769         chanmode = (params->channel_fixed && !ret) ?
1770                 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1771
1772         mutex_lock(&local->chanctx_mtx);
1773         ret = ieee80211_check_combinations(sdata, &params->chandef, chanmode,
1774                                            radar_detect_width);
1775         mutex_unlock(&local->chanctx_mtx);
1776         if (ret < 0)
1777                 return ret;
1778
1779         if (params->bssid) {
1780                 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1781                 sdata->u.ibss.fixed_bssid = true;
1782         } else
1783                 sdata->u.ibss.fixed_bssid = false;
1784
1785         sdata->u.ibss.privacy = params->privacy;
1786         sdata->u.ibss.control_port = params->control_port;
1787         sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1788         sdata->u.ibss.basic_rates = params->basic_rates;
1789         sdata->u.ibss.last_scan_completed = jiffies;
1790
1791         /* fix basic_rates if channel does not support these rates */
1792         rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
1793         sband = local->hw.wiphy->bands[params->chandef.chan->band];
1794         for (i = 0; i < sband->n_bitrates; i++) {
1795                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1796                         sdata->u.ibss.basic_rates &= ~BIT(i);
1797         }
1798         memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1799                sizeof(params->mcast_rate));
1800
1801         sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1802
1803         sdata->u.ibss.chandef = params->chandef;
1804         sdata->u.ibss.fixed_channel = params->channel_fixed;
1805
1806         if (params->ie) {
1807                 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1808                                            GFP_KERNEL);
1809                 if (sdata->u.ibss.ie)
1810                         sdata->u.ibss.ie_len = params->ie_len;
1811         }
1812
1813         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1814         sdata->u.ibss.ibss_join_req = jiffies;
1815
1816         memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1817         sdata->u.ibss.ssid_len = params->ssid_len;
1818
1819         memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1820                sizeof(sdata->u.ibss.ht_capa));
1821         memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1822                sizeof(sdata->u.ibss.ht_capa_mask));
1823
1824         /*
1825          * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1826          * reserved, but an HT STA shall protect HT transmissions as though
1827          * the HT Protection field were set to non-HT mixed mode.
1828          *
1829          * In an IBSS, the RIFS Mode field of the HT Operation element is
1830          * also reserved, but an HT STA shall operate as though this field
1831          * were set to 1.
1832          */
1833
1834         sdata->vif.bss_conf.ht_operation_mode |=
1835                   IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1836                 | IEEE80211_HT_PARAM_RIFS_MODE;
1837
1838         changed |= BSS_CHANGED_HT;
1839         ieee80211_bss_info_change_notify(sdata, changed);
1840
1841         sdata->smps_mode = IEEE80211_SMPS_OFF;
1842         sdata->needed_rx_chains = local->rx_chains;
1843
1844         ieee80211_queue_work(&local->hw, &sdata->work);
1845
1846         return 0;
1847 }
1848
1849 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1850 {
1851         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1852
1853         ieee80211_ibss_disconnect(sdata);
1854         ifibss->ssid_len = 0;
1855         eth_zero_addr(ifibss->bssid);
1856
1857         /* remove beacon */
1858         kfree(sdata->u.ibss.ie);
1859
1860         /* on the next join, re-program HT parameters */
1861         memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1862         memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1863
1864         synchronize_rcu();
1865
1866         skb_queue_purge(&sdata->skb_queue);
1867
1868         del_timer_sync(&sdata->u.ibss.timer);
1869
1870         return 0;
1871 }