Merge branch 'for-4.5-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj...
[cascardo/linux.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  *
11  * This program is free software; you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License version 2 as
13  * published by the Free Software Foundation.
14  */
15
16 #include <linux/delay.h>
17 #include <linux/slab.h>
18 #include <linux/if_ether.h>
19 #include <linux/skbuff.h>
20 #include <linux/if_arp.h>
21 #include <linux/etherdevice.h>
22 #include <linux/rtnetlink.h>
23 #include <net/mac80211.h>
24
25 #include "ieee80211_i.h"
26 #include "driver-ops.h"
27 #include "rate.h"
28
29 #define IEEE80211_SCAN_INTERVAL (2 * 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 #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ)
35
36 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
37
38 static struct beacon_data *
39 ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata,
40                            const int beacon_int, const u32 basic_rates,
41                            const u16 capability, u64 tsf,
42                            struct cfg80211_chan_def *chandef,
43                            bool *have_higher_than_11mbit,
44                            struct cfg80211_csa_settings *csa_settings)
45 {
46         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
47         struct ieee80211_local *local = sdata->local;
48         int rates_n = 0, i, ri;
49         struct ieee80211_mgmt *mgmt;
50         u8 *pos;
51         struct ieee80211_supported_band *sband;
52         u32 rate_flags, rates = 0, rates_added = 0;
53         struct beacon_data *presp;
54         int frame_len;
55         int shift;
56
57         /* Build IBSS probe response */
58         frame_len = sizeof(struct ieee80211_hdr_3addr) +
59                     12 /* struct ieee80211_mgmt.u.beacon */ +
60                     2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
61                     2 + 8 /* max Supported Rates */ +
62                     3 /* max DS params */ +
63                     4 /* IBSS params */ +
64                     5 /* Channel Switch Announcement */ +
65                     2 + (IEEE80211_MAX_SUPP_RATES - 8) +
66                     2 + sizeof(struct ieee80211_ht_cap) +
67                     2 + sizeof(struct ieee80211_ht_operation) +
68                     ifibss->ie_len;
69         presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
70         if (!presp)
71                 return NULL;
72
73         presp->head = (void *)(presp + 1);
74
75         mgmt = (void *) presp->head;
76         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
77                                           IEEE80211_STYPE_PROBE_RESP);
78         eth_broadcast_addr(mgmt->da);
79         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
80         memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
81         mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
82         mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
83         mgmt->u.beacon.capab_info = cpu_to_le16(capability);
84
85         pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
86
87         *pos++ = WLAN_EID_SSID;
88         *pos++ = ifibss->ssid_len;
89         memcpy(pos, ifibss->ssid, ifibss->ssid_len);
90         pos += ifibss->ssid_len;
91
92         sband = local->hw.wiphy->bands[chandef->chan->band];
93         rate_flags = ieee80211_chandef_rate_flags(chandef);
94         shift = ieee80211_chandef_get_shift(chandef);
95         rates_n = 0;
96         if (have_higher_than_11mbit)
97                 *have_higher_than_11mbit = false;
98
99         for (i = 0; i < sband->n_bitrates; i++) {
100                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
101                         continue;
102                 if (sband->bitrates[i].bitrate > 110 &&
103                     have_higher_than_11mbit)
104                         *have_higher_than_11mbit = true;
105
106                 rates |= BIT(i);
107                 rates_n++;
108         }
109
110         *pos++ = WLAN_EID_SUPP_RATES;
111         *pos++ = min_t(int, 8, rates_n);
112         for (ri = 0; ri < sband->n_bitrates; ri++) {
113                 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
114                                         5 * (1 << shift));
115                 u8 basic = 0;
116                 if (!(rates & BIT(ri)))
117                         continue;
118
119                 if (basic_rates & BIT(ri))
120                         basic = 0x80;
121                 *pos++ = basic | (u8) rate;
122                 if (++rates_added == 8) {
123                         ri++; /* continue at next rate for EXT_SUPP_RATES */
124                         break;
125                 }
126         }
127
128         if (sband->band == IEEE80211_BAND_2GHZ) {
129                 *pos++ = WLAN_EID_DS_PARAMS;
130                 *pos++ = 1;
131                 *pos++ = ieee80211_frequency_to_channel(
132                                 chandef->chan->center_freq);
133         }
134
135         *pos++ = WLAN_EID_IBSS_PARAMS;
136         *pos++ = 2;
137         /* FIX: set ATIM window based on scan results */
138         *pos++ = 0;
139         *pos++ = 0;
140
141         if (csa_settings) {
142                 *pos++ = WLAN_EID_CHANNEL_SWITCH;
143                 *pos++ = 3;
144                 *pos++ = csa_settings->block_tx ? 1 : 0;
145                 *pos++ = ieee80211_frequency_to_channel(
146                                 csa_settings->chandef.chan->center_freq);
147                 presp->csa_counter_offsets[0] = (pos - presp->head);
148                 *pos++ = csa_settings->count;
149                 presp->csa_current_counter = csa_settings->count;
150         }
151
152         /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
153         if (rates_n > 8) {
154                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
155                 *pos++ = rates_n - 8;
156                 for (; ri < sband->n_bitrates; ri++) {
157                         int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
158                                                 5 * (1 << shift));
159                         u8 basic = 0;
160                         if (!(rates & BIT(ri)))
161                                 continue;
162
163                         if (basic_rates & BIT(ri))
164                                 basic = 0x80;
165                         *pos++ = basic | (u8) rate;
166                 }
167         }
168
169         if (ifibss->ie_len) {
170                 memcpy(pos, ifibss->ie, ifibss->ie_len);
171                 pos += ifibss->ie_len;
172         }
173
174         /* add HT capability and information IEs */
175         if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
176             chandef->width != NL80211_CHAN_WIDTH_5 &&
177             chandef->width != NL80211_CHAN_WIDTH_10 &&
178             sband->ht_cap.ht_supported) {
179                 struct ieee80211_sta_ht_cap ht_cap;
180
181                 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
182                 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
183
184                 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
185                 /*
186                  * Note: According to 802.11n-2009 9.13.3.1, HT Protection
187                  * field and RIFS Mode are reserved in IBSS mode, therefore
188                  * keep them at 0
189                  */
190                 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
191                                                  chandef, 0, false);
192
193                 /* add VHT capability and information IEs */
194                 if (chandef->width != NL80211_CHAN_WIDTH_20 &&
195                     chandef->width != NL80211_CHAN_WIDTH_40 &&
196                     sband->vht_cap.vht_supported) {
197                         pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
198                                                          sband->vht_cap.cap);
199                         pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap,
200                                                           chandef);
201                 }
202         }
203
204         if (local->hw.queues >= IEEE80211_NUM_ACS)
205                 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */
206
207         presp->head_len = pos - presp->head;
208         if (WARN_ON(presp->head_len > frame_len))
209                 goto error;
210
211         return presp;
212 error:
213         kfree(presp);
214         return NULL;
215 }
216
217 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
218                                       const u8 *bssid, const int beacon_int,
219                                       struct cfg80211_chan_def *req_chandef,
220                                       const u32 basic_rates,
221                                       const u16 capability, u64 tsf,
222                                       bool creator)
223 {
224         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
225         struct ieee80211_local *local = sdata->local;
226         struct ieee80211_mgmt *mgmt;
227         struct cfg80211_bss *bss;
228         u32 bss_change;
229         struct cfg80211_chan_def chandef;
230         struct ieee80211_channel *chan;
231         struct beacon_data *presp;
232         struct cfg80211_inform_bss bss_meta = {};
233         bool have_higher_than_11mbit;
234         bool radar_required;
235         int err;
236
237         sdata_assert_lock(sdata);
238
239         /* Reset own TSF to allow time synchronization work. */
240         drv_reset_tsf(local, sdata);
241
242         if (!ether_addr_equal(ifibss->bssid, bssid))
243                 sta_info_flush(sdata);
244
245         /* if merging, indicate to driver that we leave the old IBSS */
246         if (sdata->vif.bss_conf.ibss_joined) {
247                 sdata->vif.bss_conf.ibss_joined = false;
248                 sdata->vif.bss_conf.ibss_creator = false;
249                 sdata->vif.bss_conf.enable_beacon = false;
250                 netif_carrier_off(sdata->dev);
251                 ieee80211_bss_info_change_notify(sdata,
252                                                  BSS_CHANGED_IBSS |
253                                                  BSS_CHANGED_BEACON_ENABLED);
254                 drv_leave_ibss(local, sdata);
255         }
256
257         presp = rcu_dereference_protected(ifibss->presp,
258                                           lockdep_is_held(&sdata->wdev.mtx));
259         RCU_INIT_POINTER(ifibss->presp, NULL);
260         if (presp)
261                 kfree_rcu(presp, rcu_head);
262
263         /* make a copy of the chandef, it could be modified below. */
264         chandef = *req_chandef;
265         chan = chandef.chan;
266         if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
267                                      NL80211_IFTYPE_ADHOC)) {
268                 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
269                     chandef.width == NL80211_CHAN_WIDTH_10 ||
270                     chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
271                     chandef.width == NL80211_CHAN_WIDTH_20) {
272                         sdata_info(sdata,
273                                    "Failed to join IBSS, beacons forbidden\n");
274                         return;
275                 }
276                 chandef.width = NL80211_CHAN_WIDTH_20;
277                 chandef.center_freq1 = chan->center_freq;
278                 /* check again for downgraded chandef */
279                 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
280                                              NL80211_IFTYPE_ADHOC)) {
281                         sdata_info(sdata,
282                                    "Failed to join IBSS, beacons forbidden\n");
283                         return;
284                 }
285         }
286
287         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
288                                             &chandef, NL80211_IFTYPE_ADHOC);
289         if (err < 0) {
290                 sdata_info(sdata,
291                            "Failed to join IBSS, invalid chandef\n");
292                 return;
293         }
294         if (err > 0 && !ifibss->userspace_handles_dfs) {
295                 sdata_info(sdata,
296                            "Failed to join IBSS, DFS channel without control program\n");
297                 return;
298         }
299
300         radar_required = err;
301
302         mutex_lock(&local->mtx);
303         if (ieee80211_vif_use_channel(sdata, &chandef,
304                                       ifibss->fixed_channel ?
305                                         IEEE80211_CHANCTX_SHARED :
306                                         IEEE80211_CHANCTX_EXCLUSIVE)) {
307                 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
308                 mutex_unlock(&local->mtx);
309                 return;
310         }
311         sdata->radar_required = radar_required;
312         mutex_unlock(&local->mtx);
313
314         memcpy(ifibss->bssid, bssid, ETH_ALEN);
315
316         presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
317                                            capability, tsf, &chandef,
318                                            &have_higher_than_11mbit, NULL);
319         if (!presp)
320                 return;
321
322         rcu_assign_pointer(ifibss->presp, presp);
323         mgmt = (void *)presp->head;
324
325         sdata->vif.bss_conf.enable_beacon = true;
326         sdata->vif.bss_conf.beacon_int = beacon_int;
327         sdata->vif.bss_conf.basic_rates = basic_rates;
328         sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
329         memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
330         bss_change = BSS_CHANGED_BEACON_INT;
331         bss_change |= ieee80211_reset_erp_info(sdata);
332         bss_change |= BSS_CHANGED_BSSID;
333         bss_change |= BSS_CHANGED_BEACON;
334         bss_change |= BSS_CHANGED_BEACON_ENABLED;
335         bss_change |= BSS_CHANGED_BASIC_RATES;
336         bss_change |= BSS_CHANGED_HT;
337         bss_change |= BSS_CHANGED_IBSS;
338         bss_change |= BSS_CHANGED_SSID;
339
340         /*
341          * In 5 GHz/802.11a, we can always use short slot time.
342          * (IEEE 802.11-2012 18.3.8.7)
343          *
344          * In 2.4GHz, we must always use long slots in IBSS for compatibility
345          * reasons.
346          * (IEEE 802.11-2012 19.4.5)
347          *
348          * HT follows these specifications (IEEE 802.11-2012 20.3.18)
349          */
350         sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ;
351         bss_change |= BSS_CHANGED_ERP_SLOT;
352
353         /* cf. IEEE 802.11 9.2.12 */
354         if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit)
355                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
356         else
357                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
358
359         ieee80211_set_wmm_default(sdata, true, false);
360
361         sdata->vif.bss_conf.ibss_joined = true;
362         sdata->vif.bss_conf.ibss_creator = creator;
363
364         err = drv_join_ibss(local, sdata);
365         if (err) {
366                 sdata->vif.bss_conf.ibss_joined = false;
367                 sdata->vif.bss_conf.ibss_creator = false;
368                 sdata->vif.bss_conf.enable_beacon = false;
369                 sdata->vif.bss_conf.ssid_len = 0;
370                 RCU_INIT_POINTER(ifibss->presp, NULL);
371                 kfree_rcu(presp, rcu_head);
372                 mutex_lock(&local->mtx);
373                 ieee80211_vif_release_channel(sdata);
374                 mutex_unlock(&local->mtx);
375                 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
376                            err);
377                 return;
378         }
379
380         ieee80211_bss_info_change_notify(sdata, bss_change);
381
382         ifibss->state = IEEE80211_IBSS_MLME_JOINED;
383         mod_timer(&ifibss->timer,
384                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
385
386         bss_meta.chan = chan;
387         bss_meta.scan_width = cfg80211_chandef_to_scan_width(&chandef);
388         bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt,
389                                              presp->head_len, GFP_KERNEL);
390
391         cfg80211_put_bss(local->hw.wiphy, bss);
392         netif_carrier_on(sdata->dev);
393         cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
394 }
395
396 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
397                                     struct ieee80211_bss *bss)
398 {
399         struct cfg80211_bss *cbss =
400                 container_of((void *)bss, struct cfg80211_bss, priv);
401         struct ieee80211_supported_band *sband;
402         struct cfg80211_chan_def chandef;
403         u32 basic_rates;
404         int i, j;
405         u16 beacon_int = cbss->beacon_interval;
406         const struct cfg80211_bss_ies *ies;
407         enum nl80211_channel_type chan_type;
408         u64 tsf;
409         u32 rate_flags;
410         int shift;
411
412         sdata_assert_lock(sdata);
413
414         if (beacon_int < 10)
415                 beacon_int = 10;
416
417         switch (sdata->u.ibss.chandef.width) {
418         case NL80211_CHAN_WIDTH_20_NOHT:
419         case NL80211_CHAN_WIDTH_20:
420         case NL80211_CHAN_WIDTH_40:
421                 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
422                 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
423                 break;
424         case NL80211_CHAN_WIDTH_5:
425         case NL80211_CHAN_WIDTH_10:
426                 cfg80211_chandef_create(&chandef, cbss->channel,
427                                         NL80211_CHAN_WIDTH_20_NOHT);
428                 chandef.width = sdata->u.ibss.chandef.width;
429                 break;
430         case NL80211_CHAN_WIDTH_80:
431         case NL80211_CHAN_WIDTH_80P80:
432         case NL80211_CHAN_WIDTH_160:
433                 chandef = sdata->u.ibss.chandef;
434                 chandef.chan = cbss->channel;
435                 break;
436         default:
437                 /* fall back to 20 MHz for unsupported modes */
438                 cfg80211_chandef_create(&chandef, cbss->channel,
439                                         NL80211_CHAN_WIDTH_20_NOHT);
440                 break;
441         }
442
443         sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
444         rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
445         shift = ieee80211_vif_get_shift(&sdata->vif);
446
447         basic_rates = 0;
448
449         for (i = 0; i < bss->supp_rates_len; i++) {
450                 int rate = bss->supp_rates[i] & 0x7f;
451                 bool is_basic = !!(bss->supp_rates[i] & 0x80);
452
453                 for (j = 0; j < sband->n_bitrates; j++) {
454                         int brate;
455                         if ((rate_flags & sband->bitrates[j].flags)
456                             != rate_flags)
457                                 continue;
458
459                         brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
460                                              5 * (1 << shift));
461                         if (brate == rate) {
462                                 if (is_basic)
463                                         basic_rates |= BIT(j);
464                                 break;
465                         }
466                 }
467         }
468
469         rcu_read_lock();
470         ies = rcu_dereference(cbss->ies);
471         tsf = ies->tsf;
472         rcu_read_unlock();
473
474         __ieee80211_sta_join_ibss(sdata, cbss->bssid,
475                                   beacon_int,
476                                   &chandef,
477                                   basic_rates,
478                                   cbss->capability,
479                                   tsf, false);
480 }
481
482 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
483                               struct cfg80211_csa_settings *csa_settings)
484 {
485         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
486         struct beacon_data *presp, *old_presp;
487         struct cfg80211_bss *cbss;
488         const struct cfg80211_bss_ies *ies;
489         u16 capability = 0;
490         u64 tsf;
491         int ret = 0;
492
493         sdata_assert_lock(sdata);
494
495         if (ifibss->privacy)
496                 capability = WLAN_CAPABILITY_PRIVACY;
497
498         cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
499                                 ifibss->bssid, ifibss->ssid,
500                                 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS,
501                                 IEEE80211_PRIVACY(ifibss->privacy));
502
503         if (WARN_ON(!cbss)) {
504                 ret = -EINVAL;
505                 goto out;
506         }
507
508         rcu_read_lock();
509         ies = rcu_dereference(cbss->ies);
510         tsf = ies->tsf;
511         rcu_read_unlock();
512         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
513
514         old_presp = rcu_dereference_protected(ifibss->presp,
515                                           lockdep_is_held(&sdata->wdev.mtx));
516
517         presp = ieee80211_ibss_build_presp(sdata,
518                                            sdata->vif.bss_conf.beacon_int,
519                                            sdata->vif.bss_conf.basic_rates,
520                                            capability, tsf, &ifibss->chandef,
521                                            NULL, csa_settings);
522         if (!presp) {
523                 ret = -ENOMEM;
524                 goto out;
525         }
526
527         rcu_assign_pointer(ifibss->presp, presp);
528         if (old_presp)
529                 kfree_rcu(old_presp, rcu_head);
530
531         return BSS_CHANGED_BEACON;
532  out:
533         return ret;
534 }
535
536 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
537 {
538         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
539         struct cfg80211_bss *cbss;
540         int err, changed = 0;
541
542         sdata_assert_lock(sdata);
543
544         /* update cfg80211 bss information with the new channel */
545         if (!is_zero_ether_addr(ifibss->bssid)) {
546                 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
547                                         ifibss->chandef.chan,
548                                         ifibss->bssid, ifibss->ssid,
549                                         ifibss->ssid_len,
550                                         IEEE80211_BSS_TYPE_IBSS,
551                                         IEEE80211_PRIVACY(ifibss->privacy));
552                 /* XXX: should not really modify cfg80211 data */
553                 if (cbss) {
554                         cbss->channel = sdata->csa_chandef.chan;
555                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
556                 }
557         }
558
559         ifibss->chandef = sdata->csa_chandef;
560
561         /* generate the beacon */
562         err = ieee80211_ibss_csa_beacon(sdata, NULL);
563         if (err < 0)
564                 return err;
565
566         changed |= err;
567
568         return changed;
569 }
570
571 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
572 {
573         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
574
575         cancel_work_sync(&ifibss->csa_connection_drop_work);
576 }
577
578 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
579         __acquires(RCU)
580 {
581         struct ieee80211_sub_if_data *sdata = sta->sdata;
582         u8 addr[ETH_ALEN];
583
584         memcpy(addr, sta->sta.addr, ETH_ALEN);
585
586         ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
587
588         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
589         sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
590         /* authorize the station only if the network is not RSN protected. If
591          * not wait for the userspace to authorize it */
592         if (!sta->sdata->u.ibss.control_port)
593                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
594
595         rate_control_rate_init(sta);
596
597         /* If it fails, maybe we raced another insertion? */
598         if (sta_info_insert_rcu(sta))
599                 return sta_info_get(sdata, addr);
600         return sta;
601 }
602
603 static struct sta_info *
604 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
605                        const u8 *addr, u32 supp_rates)
606         __acquires(RCU)
607 {
608         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
609         struct ieee80211_local *local = sdata->local;
610         struct sta_info *sta;
611         struct ieee80211_chanctx_conf *chanctx_conf;
612         struct ieee80211_supported_band *sband;
613         enum nl80211_bss_scan_width scan_width;
614         int band;
615
616         /*
617          * XXX: Consider removing the least recently used entry and
618          *      allow new one to be added.
619          */
620         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
621                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
622                                     sdata->name, addr);
623                 rcu_read_lock();
624                 return NULL;
625         }
626
627         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
628                 rcu_read_lock();
629                 return NULL;
630         }
631
632         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
633                 rcu_read_lock();
634                 return NULL;
635         }
636
637         rcu_read_lock();
638         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
639         if (WARN_ON_ONCE(!chanctx_conf))
640                 return NULL;
641         band = chanctx_conf->def.chan->band;
642         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
643         rcu_read_unlock();
644
645         sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
646         if (!sta) {
647                 rcu_read_lock();
648                 return NULL;
649         }
650
651         sta->rx_stats.last_rx = jiffies;
652
653         /* make sure mandatory rates are always added */
654         sband = local->hw.wiphy->bands[band];
655         sta->sta.supp_rates[band] = supp_rates |
656                         ieee80211_mandatory_rates(sband, scan_width);
657
658         return ieee80211_ibss_finish_sta(sta);
659 }
660
661 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
662 {
663         struct ieee80211_local *local = sdata->local;
664         int active = 0;
665         struct sta_info *sta;
666
667         sdata_assert_lock(sdata);
668
669         rcu_read_lock();
670
671         list_for_each_entry_rcu(sta, &local->sta_list, list) {
672                 if (sta->sdata == sdata &&
673                     time_after(sta->rx_stats.last_rx +
674                                IEEE80211_IBSS_MERGE_INTERVAL,
675                                jiffies)) {
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 ieee80211_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                 ieee80211_ht_oper_to_chandef(channel,
1054                                              elems->ht_operation,
1055                                              &chandef);
1056
1057                 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1058                 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1059                                                                    &htcap_ie,
1060                                                                    sta);
1061
1062                 if (elems->vht_operation && elems->vht_cap_elem &&
1063                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1064                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1065                         /* we both use VHT */
1066                         struct ieee80211_vht_cap cap_ie;
1067                         struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap;
1068
1069                         ieee80211_vht_oper_to_chandef(channel,
1070                                                       elems->vht_operation,
1071                                                       &chandef);
1072                         memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1073                         ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1074                                                             &cap_ie, sta);
1075                         if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap)))
1076                                 rates_updated |= true;
1077                 }
1078
1079                 if (bw != sta->sta.bandwidth)
1080                         rates_updated |= true;
1081
1082                 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1083                                                  &chandef))
1084                         WARN_ON_ONCE(1);
1085         }
1086
1087         if (sta && rates_updated) {
1088                 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1089                 u8 rx_nss = sta->sta.rx_nss;
1090
1091                 /* Force rx_nss recalculation */
1092                 sta->sta.rx_nss = 0;
1093                 rate_control_rate_init(sta);
1094                 if (sta->sta.rx_nss != rx_nss)
1095                         changed |= IEEE80211_RC_NSS_CHANGED;
1096
1097                 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1098         }
1099
1100         rcu_read_unlock();
1101 }
1102
1103 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1104                                   struct ieee80211_mgmt *mgmt, size_t len,
1105                                   struct ieee80211_rx_status *rx_status,
1106                                   struct ieee802_11_elems *elems)
1107 {
1108         struct ieee80211_local *local = sdata->local;
1109         struct cfg80211_bss *cbss;
1110         struct ieee80211_bss *bss;
1111         struct ieee80211_channel *channel;
1112         u64 beacon_timestamp, rx_timestamp;
1113         u32 supp_rates = 0;
1114         enum ieee80211_band band = rx_status->band;
1115
1116         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1117         if (!channel)
1118                 return;
1119
1120         ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1121
1122         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1123                                         channel);
1124         if (!bss)
1125                 return;
1126
1127         cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1128
1129         /* same for beacon and probe response */
1130         beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1131
1132         /* check if we need to merge IBSS */
1133
1134         /* not an IBSS */
1135         if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1136                 goto put_bss;
1137
1138         /* different channel */
1139         if (sdata->u.ibss.fixed_channel &&
1140             sdata->u.ibss.chandef.chan != cbss->channel)
1141                 goto put_bss;
1142
1143         /* different SSID */
1144         if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1145             memcmp(elems->ssid, sdata->u.ibss.ssid,
1146                                 sdata->u.ibss.ssid_len))
1147                 goto put_bss;
1148
1149         /* process channel switch */
1150         if (sdata->vif.csa_active ||
1151             ieee80211_ibss_process_chanswitch(sdata, elems, true))
1152                 goto put_bss;
1153
1154         /* same BSSID */
1155         if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1156                 goto put_bss;
1157
1158         /* we use a fixed BSSID */
1159         if (sdata->u.ibss.fixed_bssid)
1160                 goto put_bss;
1161
1162         if (ieee80211_have_rx_timestamp(rx_status)) {
1163                 /* time when timestamp field was received */
1164                 rx_timestamp =
1165                         ieee80211_calculate_rx_timestamp(local, rx_status,
1166                                                          len + FCS_LEN, 24);
1167         } else {
1168                 /*
1169                  * second best option: get current TSF
1170                  * (will return -1 if not supported)
1171                  */
1172                 rx_timestamp = drv_get_tsf(local, sdata);
1173         }
1174
1175         ibss_dbg(sdata,
1176                  "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1177                  mgmt->sa, mgmt->bssid,
1178                  (unsigned long long)rx_timestamp,
1179                  (unsigned long long)beacon_timestamp,
1180                  (unsigned long long)(rx_timestamp - beacon_timestamp),
1181                  jiffies);
1182
1183         if (beacon_timestamp > rx_timestamp) {
1184                 ibss_dbg(sdata,
1185                          "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1186                          mgmt->bssid);
1187                 ieee80211_sta_join_ibss(sdata, bss);
1188                 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1189                 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1190                                        supp_rates);
1191                 rcu_read_unlock();
1192         }
1193
1194  put_bss:
1195         ieee80211_rx_bss_put(local, bss);
1196 }
1197
1198 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1199                               const u8 *bssid, const u8 *addr,
1200                               u32 supp_rates)
1201 {
1202         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1203         struct ieee80211_local *local = sdata->local;
1204         struct sta_info *sta;
1205         struct ieee80211_chanctx_conf *chanctx_conf;
1206         struct ieee80211_supported_band *sband;
1207         enum nl80211_bss_scan_width scan_width;
1208         int band;
1209
1210         /*
1211          * XXX: Consider removing the least recently used entry and
1212          *      allow new one to be added.
1213          */
1214         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1215                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1216                                     sdata->name, addr);
1217                 return;
1218         }
1219
1220         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1221                 return;
1222
1223         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1224                 return;
1225
1226         rcu_read_lock();
1227         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1228         if (WARN_ON_ONCE(!chanctx_conf)) {
1229                 rcu_read_unlock();
1230                 return;
1231         }
1232         band = chanctx_conf->def.chan->band;
1233         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1234         rcu_read_unlock();
1235
1236         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1237         if (!sta)
1238                 return;
1239
1240         sta->rx_stats.last_rx = jiffies;
1241
1242         /* make sure mandatory rates are always added */
1243         sband = local->hw.wiphy->bands[band];
1244         sta->sta.supp_rates[band] = supp_rates |
1245                         ieee80211_mandatory_rates(sband, scan_width);
1246
1247         spin_lock(&ifibss->incomplete_lock);
1248         list_add(&sta->list, &ifibss->incomplete_stations);
1249         spin_unlock(&ifibss->incomplete_lock);
1250         ieee80211_queue_work(&local->hw, &sdata->work);
1251 }
1252
1253 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1254 {
1255         struct ieee80211_local *local = sdata->local;
1256         struct sta_info *sta, *tmp;
1257         unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1258         unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1259
1260         mutex_lock(&local->sta_mtx);
1261
1262         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1263                 if (sdata != sta->sdata)
1264                         continue;
1265
1266                 if (time_after(jiffies, sta->rx_stats.last_rx + exp_time) ||
1267                     (time_after(jiffies, sta->rx_stats.last_rx + exp_rsn) &&
1268                      sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1269                         sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1270                                 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1271                                 "not authorized " : "", sta->sta.addr);
1272
1273                         WARN_ON(__sta_info_destroy(sta));
1274                 }
1275         }
1276
1277         mutex_unlock(&local->sta_mtx);
1278 }
1279
1280 /*
1281  * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1282  */
1283
1284 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1285 {
1286         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1287         enum nl80211_bss_scan_width scan_width;
1288
1289         sdata_assert_lock(sdata);
1290
1291         mod_timer(&ifibss->timer,
1292                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1293
1294         ieee80211_ibss_sta_expire(sdata);
1295
1296         if (time_before(jiffies, ifibss->last_scan_completed +
1297                        IEEE80211_IBSS_MERGE_INTERVAL))
1298                 return;
1299
1300         if (ieee80211_sta_active_ibss(sdata))
1301                 return;
1302
1303         if (ifibss->fixed_channel)
1304                 return;
1305
1306         sdata_info(sdata,
1307                    "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1308
1309         scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1310         ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1311                                     NULL, 0, scan_width);
1312 }
1313
1314 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1315 {
1316         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1317         u8 bssid[ETH_ALEN];
1318         u16 capability;
1319         int i;
1320
1321         sdata_assert_lock(sdata);
1322
1323         if (ifibss->fixed_bssid) {
1324                 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1325         } else {
1326                 /* Generate random, not broadcast, locally administered BSSID. Mix in
1327                  * own MAC address to make sure that devices that do not have proper
1328                  * random number generator get different BSSID. */
1329                 get_random_bytes(bssid, ETH_ALEN);
1330                 for (i = 0; i < ETH_ALEN; i++)
1331                         bssid[i] ^= sdata->vif.addr[i];
1332                 bssid[0] &= ~0x01;
1333                 bssid[0] |= 0x02;
1334         }
1335
1336         sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1337
1338         capability = WLAN_CAPABILITY_IBSS;
1339
1340         if (ifibss->privacy)
1341                 capability |= WLAN_CAPABILITY_PRIVACY;
1342
1343         __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1344                                   &ifibss->chandef, ifibss->basic_rates,
1345                                   capability, 0, true);
1346 }
1347
1348 static unsigned ibss_setup_channels(struct wiphy *wiphy,
1349                                     struct ieee80211_channel **channels,
1350                                     unsigned int channels_max,
1351                                     u32 center_freq, u32 width)
1352 {
1353         struct ieee80211_channel *chan = NULL;
1354         unsigned int n_chan = 0;
1355         u32 start_freq, end_freq, freq;
1356
1357         if (width <= 20) {
1358                 start_freq = center_freq;
1359                 end_freq = center_freq;
1360         } else {
1361                 start_freq = center_freq - width / 2 + 10;
1362                 end_freq = center_freq + width / 2 - 10;
1363         }
1364
1365         for (freq = start_freq; freq <= end_freq; freq += 20) {
1366                 chan = ieee80211_get_channel(wiphy, freq);
1367                 if (!chan)
1368                         continue;
1369                 if (n_chan >= channels_max)
1370                         return n_chan;
1371
1372                 channels[n_chan] = chan;
1373                 n_chan++;
1374         }
1375
1376         return n_chan;
1377 }
1378
1379 static unsigned int
1380 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1381                                    const struct cfg80211_chan_def *chandef,
1382                                    struct ieee80211_channel **channels,
1383                                    unsigned int channels_max)
1384 {
1385         unsigned int n_chan = 0;
1386         u32 width, cf1, cf2 = 0;
1387
1388         switch (chandef->width) {
1389         case NL80211_CHAN_WIDTH_40:
1390                 width = 40;
1391                 break;
1392         case NL80211_CHAN_WIDTH_80P80:
1393                 cf2 = chandef->center_freq2;
1394                 /* fall through */
1395         case NL80211_CHAN_WIDTH_80:
1396                 width = 80;
1397                 break;
1398         case NL80211_CHAN_WIDTH_160:
1399                 width = 160;
1400                 break;
1401         default:
1402                 width = 20;
1403                 break;
1404         }
1405
1406         cf1 = chandef->center_freq1;
1407
1408         n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1409
1410         if (cf2)
1411                 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1412                                               channels_max - n_chan, cf2,
1413                                               width);
1414
1415         return n_chan;
1416 }
1417
1418 /*
1419  * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1420  */
1421
1422 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1423 {
1424         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1425         struct ieee80211_local *local = sdata->local;
1426         struct cfg80211_bss *cbss;
1427         struct ieee80211_channel *chan = NULL;
1428         const u8 *bssid = NULL;
1429         enum nl80211_bss_scan_width scan_width;
1430         int active_ibss;
1431
1432         sdata_assert_lock(sdata);
1433
1434         active_ibss = ieee80211_sta_active_ibss(sdata);
1435         ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1436
1437         if (active_ibss)
1438                 return;
1439
1440         if (ifibss->fixed_bssid)
1441                 bssid = ifibss->bssid;
1442         if (ifibss->fixed_channel)
1443                 chan = ifibss->chandef.chan;
1444         if (!is_zero_ether_addr(ifibss->bssid))
1445                 bssid = ifibss->bssid;
1446         cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1447                                 ifibss->ssid, ifibss->ssid_len,
1448                                 IEEE80211_BSS_TYPE_IBSS,
1449                                 IEEE80211_PRIVACY(ifibss->privacy));
1450
1451         if (cbss) {
1452                 struct ieee80211_bss *bss;
1453
1454                 bss = (void *)cbss->priv;
1455                 ibss_dbg(sdata,
1456                          "sta_find_ibss: selected %pM current %pM\n",
1457                          cbss->bssid, ifibss->bssid);
1458                 sdata_info(sdata,
1459                            "Selected IBSS BSSID %pM based on configured SSID\n",
1460                            cbss->bssid);
1461
1462                 ieee80211_sta_join_ibss(sdata, bss);
1463                 ieee80211_rx_bss_put(local, bss);
1464                 return;
1465         }
1466
1467         /* if a fixed bssid and a fixed freq have been provided create the IBSS
1468          * directly and do not waste time scanning
1469          */
1470         if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1471                 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1472                            bssid);
1473                 ieee80211_sta_create_ibss(sdata);
1474                 return;
1475         }
1476
1477
1478         ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1479
1480         /* Selected IBSS not found in current scan results - try to scan */
1481         if (time_after(jiffies, ifibss->last_scan_completed +
1482                                         IEEE80211_SCAN_INTERVAL)) {
1483                 struct ieee80211_channel *channels[8];
1484                 unsigned int num;
1485
1486                 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1487
1488                 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1489                                                          &ifibss->chandef,
1490                                                          channels,
1491                                                          ARRAY_SIZE(channels));
1492                 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1493                 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1494                                             ifibss->ssid_len, channels, num,
1495                                             scan_width);
1496         } else {
1497                 int interval = IEEE80211_SCAN_INTERVAL;
1498
1499                 if (time_after(jiffies, ifibss->ibss_join_req +
1500                                IEEE80211_IBSS_JOIN_TIMEOUT))
1501                         ieee80211_sta_create_ibss(sdata);
1502
1503                 mod_timer(&ifibss->timer,
1504                           round_jiffies(jiffies + interval));
1505         }
1506 }
1507
1508 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1509                                         struct sk_buff *req)
1510 {
1511         struct ieee80211_mgmt *mgmt = (void *)req->data;
1512         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1513         struct ieee80211_local *local = sdata->local;
1514         int tx_last_beacon, len = req->len;
1515         struct sk_buff *skb;
1516         struct beacon_data *presp;
1517         u8 *pos, *end;
1518
1519         sdata_assert_lock(sdata);
1520
1521         presp = rcu_dereference_protected(ifibss->presp,
1522                                           lockdep_is_held(&sdata->wdev.mtx));
1523
1524         if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1525             len < 24 + 2 || !presp)
1526                 return;
1527
1528         tx_last_beacon = drv_tx_last_beacon(local);
1529
1530         ibss_dbg(sdata,
1531                  "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
1532                  mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
1533
1534         if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1535                 return;
1536
1537         if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1538             !is_broadcast_ether_addr(mgmt->bssid))
1539                 return;
1540
1541         end = ((u8 *) mgmt) + len;
1542         pos = mgmt->u.probe_req.variable;
1543         if (pos[0] != WLAN_EID_SSID ||
1544             pos + 2 + pos[1] > end) {
1545                 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1546                          mgmt->sa);
1547                 return;
1548         }
1549         if (pos[1] != 0 &&
1550             (pos[1] != ifibss->ssid_len ||
1551              memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1552                 /* Ignore ProbeReq for foreign SSID */
1553                 return;
1554         }
1555
1556         /* Reply with ProbeResp */
1557         skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1558         if (!skb)
1559                 return;
1560
1561         skb_reserve(skb, local->tx_headroom);
1562         memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
1563
1564         memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1565         ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1566         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1567
1568         /* avoid excessive retries for probe request to wildcard SSIDs */
1569         if (pos[1] == 0)
1570                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1571
1572         ieee80211_tx_skb(sdata, skb);
1573 }
1574
1575 static
1576 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1577                                     struct ieee80211_mgmt *mgmt, size_t len,
1578                                     struct ieee80211_rx_status *rx_status)
1579 {
1580         size_t baselen;
1581         struct ieee802_11_elems elems;
1582
1583         BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1584                      offsetof(typeof(mgmt->u.beacon), variable));
1585
1586         /*
1587          * either beacon or probe_resp but the variable field is at the
1588          * same offset
1589          */
1590         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1591         if (baselen > len)
1592                 return;
1593
1594         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1595                                false, &elems);
1596
1597         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1598 }
1599
1600 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1601                                    struct sk_buff *skb)
1602 {
1603         struct ieee80211_rx_status *rx_status;
1604         struct ieee80211_mgmt *mgmt;
1605         u16 fc;
1606         struct ieee802_11_elems elems;
1607         int ies_len;
1608
1609         rx_status = IEEE80211_SKB_RXCB(skb);
1610         mgmt = (struct ieee80211_mgmt *) skb->data;
1611         fc = le16_to_cpu(mgmt->frame_control);
1612
1613         sdata_lock(sdata);
1614
1615         if (!sdata->u.ibss.ssid_len)
1616                 goto mgmt_out; /* not ready to merge yet */
1617
1618         switch (fc & IEEE80211_FCTL_STYPE) {
1619         case IEEE80211_STYPE_PROBE_REQ:
1620                 ieee80211_rx_mgmt_probe_req(sdata, skb);
1621                 break;
1622         case IEEE80211_STYPE_PROBE_RESP:
1623         case IEEE80211_STYPE_BEACON:
1624                 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1625                                                rx_status);
1626                 break;
1627         case IEEE80211_STYPE_AUTH:
1628                 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1629                 break;
1630         case IEEE80211_STYPE_DEAUTH:
1631                 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1632                 break;
1633         case IEEE80211_STYPE_ACTION:
1634                 switch (mgmt->u.action.category) {
1635                 case WLAN_CATEGORY_SPECTRUM_MGMT:
1636                         ies_len = skb->len -
1637                                   offsetof(struct ieee80211_mgmt,
1638                                            u.action.u.chan_switch.variable);
1639
1640                         if (ies_len < 0)
1641                                 break;
1642
1643                         ieee802_11_parse_elems(
1644                                 mgmt->u.action.u.chan_switch.variable,
1645                                 ies_len, true, &elems);
1646
1647                         if (elems.parse_error)
1648                                 break;
1649
1650                         ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1651                                                         rx_status, &elems);
1652                         break;
1653                 }
1654         }
1655
1656  mgmt_out:
1657         sdata_unlock(sdata);
1658 }
1659
1660 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1661 {
1662         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1663         struct sta_info *sta;
1664
1665         sdata_lock(sdata);
1666
1667         /*
1668          * Work could be scheduled after scan or similar
1669          * when we aren't even joined (or trying) with a
1670          * network.
1671          */
1672         if (!ifibss->ssid_len)
1673                 goto out;
1674
1675         spin_lock_bh(&ifibss->incomplete_lock);
1676         while (!list_empty(&ifibss->incomplete_stations)) {
1677                 sta = list_first_entry(&ifibss->incomplete_stations,
1678                                        struct sta_info, list);
1679                 list_del(&sta->list);
1680                 spin_unlock_bh(&ifibss->incomplete_lock);
1681
1682                 ieee80211_ibss_finish_sta(sta);
1683                 rcu_read_unlock();
1684                 spin_lock_bh(&ifibss->incomplete_lock);
1685         }
1686         spin_unlock_bh(&ifibss->incomplete_lock);
1687
1688         switch (ifibss->state) {
1689         case IEEE80211_IBSS_MLME_SEARCH:
1690                 ieee80211_sta_find_ibss(sdata);
1691                 break;
1692         case IEEE80211_IBSS_MLME_JOINED:
1693                 ieee80211_sta_merge_ibss(sdata);
1694                 break;
1695         default:
1696                 WARN_ON(1);
1697                 break;
1698         }
1699
1700  out:
1701         sdata_unlock(sdata);
1702 }
1703
1704 static void ieee80211_ibss_timer(unsigned long data)
1705 {
1706         struct ieee80211_sub_if_data *sdata =
1707                 (struct ieee80211_sub_if_data *) data;
1708
1709         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1710 }
1711
1712 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1713 {
1714         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1715
1716         setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1717                     (unsigned long) sdata);
1718         INIT_LIST_HEAD(&ifibss->incomplete_stations);
1719         spin_lock_init(&ifibss->incomplete_lock);
1720         INIT_WORK(&ifibss->csa_connection_drop_work,
1721                   ieee80211_csa_connection_drop_work);
1722 }
1723
1724 /* scan finished notification */
1725 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1726 {
1727         struct ieee80211_sub_if_data *sdata;
1728
1729         mutex_lock(&local->iflist_mtx);
1730         list_for_each_entry(sdata, &local->interfaces, list) {
1731                 if (!ieee80211_sdata_running(sdata))
1732                         continue;
1733                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1734                         continue;
1735                 sdata->u.ibss.last_scan_completed = jiffies;
1736         }
1737         mutex_unlock(&local->iflist_mtx);
1738 }
1739
1740 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1741                         struct cfg80211_ibss_params *params)
1742 {
1743         u32 changed = 0;
1744         u32 rate_flags;
1745         struct ieee80211_supported_band *sband;
1746         enum ieee80211_chanctx_mode chanmode;
1747         struct ieee80211_local *local = sdata->local;
1748         int radar_detect_width = 0;
1749         int i;
1750         int ret;
1751
1752         ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1753                                             &params->chandef,
1754                                             sdata->wdev.iftype);
1755         if (ret < 0)
1756                 return ret;
1757
1758         if (ret > 0) {
1759                 if (!params->userspace_handles_dfs)
1760                         return -EINVAL;
1761                 radar_detect_width = BIT(params->chandef.width);
1762         }
1763
1764         chanmode = (params->channel_fixed && !ret) ?
1765                 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1766
1767         mutex_lock(&local->chanctx_mtx);
1768         ret = ieee80211_check_combinations(sdata, &params->chandef, chanmode,
1769                                            radar_detect_width);
1770         mutex_unlock(&local->chanctx_mtx);
1771         if (ret < 0)
1772                 return ret;
1773
1774         if (params->bssid) {
1775                 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1776                 sdata->u.ibss.fixed_bssid = true;
1777         } else
1778                 sdata->u.ibss.fixed_bssid = false;
1779
1780         sdata->u.ibss.privacy = params->privacy;
1781         sdata->u.ibss.control_port = params->control_port;
1782         sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1783         sdata->u.ibss.basic_rates = params->basic_rates;
1784         sdata->u.ibss.last_scan_completed = jiffies;
1785
1786         /* fix basic_rates if channel does not support these rates */
1787         rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
1788         sband = local->hw.wiphy->bands[params->chandef.chan->band];
1789         for (i = 0; i < sband->n_bitrates; i++) {
1790                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1791                         sdata->u.ibss.basic_rates &= ~BIT(i);
1792         }
1793         memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1794                sizeof(params->mcast_rate));
1795
1796         sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1797
1798         sdata->u.ibss.chandef = params->chandef;
1799         sdata->u.ibss.fixed_channel = params->channel_fixed;
1800
1801         if (params->ie) {
1802                 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1803                                            GFP_KERNEL);
1804                 if (sdata->u.ibss.ie)
1805                         sdata->u.ibss.ie_len = params->ie_len;
1806         }
1807
1808         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1809         sdata->u.ibss.ibss_join_req = jiffies;
1810
1811         memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1812         sdata->u.ibss.ssid_len = params->ssid_len;
1813
1814         memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1815                sizeof(sdata->u.ibss.ht_capa));
1816         memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1817                sizeof(sdata->u.ibss.ht_capa_mask));
1818
1819         /*
1820          * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1821          * reserved, but an HT STA shall protect HT transmissions as though
1822          * the HT Protection field were set to non-HT mixed mode.
1823          *
1824          * In an IBSS, the RIFS Mode field of the HT Operation element is
1825          * also reserved, but an HT STA shall operate as though this field
1826          * were set to 1.
1827          */
1828
1829         sdata->vif.bss_conf.ht_operation_mode |=
1830                   IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1831                 | IEEE80211_HT_PARAM_RIFS_MODE;
1832
1833         changed |= BSS_CHANGED_HT;
1834         ieee80211_bss_info_change_notify(sdata, changed);
1835
1836         sdata->smps_mode = IEEE80211_SMPS_OFF;
1837         sdata->needed_rx_chains = local->rx_chains;
1838
1839         ieee80211_queue_work(&local->hw, &sdata->work);
1840
1841         return 0;
1842 }
1843
1844 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1845 {
1846         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1847
1848         ieee80211_ibss_disconnect(sdata);
1849         ifibss->ssid_len = 0;
1850         eth_zero_addr(ifibss->bssid);
1851
1852         /* remove beacon */
1853         kfree(sdata->u.ibss.ie);
1854
1855         /* on the next join, re-program HT parameters */
1856         memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1857         memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1858
1859         synchronize_rcu();
1860
1861         skb_queue_purge(&sdata->skb_queue);
1862
1863         del_timer_sync(&sdata->u.ibss.timer);
1864
1865         return 0;
1866 }