Merge tag 'mac80211-for-davem-2018-09-03' of git://git.kernel.org/pub/scm/linux/kerne...
[muen/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  * 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                     2 + sizeof(struct ieee80211_vht_cap) +
70                     2 + sizeof(struct ieee80211_vht_operation) +
71                     ifibss->ie_len;
72         presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
73         if (!presp)
74                 return NULL;
75
76         presp->head = (void *)(presp + 1);
77
78         mgmt = (void *) presp->head;
79         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
80                                           IEEE80211_STYPE_PROBE_RESP);
81         eth_broadcast_addr(mgmt->da);
82         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
83         memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
84         mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
85         mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
86         mgmt->u.beacon.capab_info = cpu_to_le16(capability);
87
88         pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
89
90         *pos++ = WLAN_EID_SSID;
91         *pos++ = ifibss->ssid_len;
92         memcpy(pos, ifibss->ssid, ifibss->ssid_len);
93         pos += ifibss->ssid_len;
94
95         sband = local->hw.wiphy->bands[chandef->chan->band];
96         rate_flags = ieee80211_chandef_rate_flags(chandef);
97         shift = ieee80211_chandef_get_shift(chandef);
98         rates_n = 0;
99         if (have_higher_than_11mbit)
100                 *have_higher_than_11mbit = false;
101
102         for (i = 0; i < sband->n_bitrates; i++) {
103                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
104                         continue;
105                 if (sband->bitrates[i].bitrate > 110 &&
106                     have_higher_than_11mbit)
107                         *have_higher_than_11mbit = true;
108
109                 rates |= BIT(i);
110                 rates_n++;
111         }
112
113         *pos++ = WLAN_EID_SUPP_RATES;
114         *pos++ = min_t(int, 8, rates_n);
115         for (ri = 0; ri < sband->n_bitrates; ri++) {
116                 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
117                                         5 * (1 << shift));
118                 u8 basic = 0;
119                 if (!(rates & BIT(ri)))
120                         continue;
121
122                 if (basic_rates & BIT(ri))
123                         basic = 0x80;
124                 *pos++ = basic | (u8) rate;
125                 if (++rates_added == 8) {
126                         ri++; /* continue at next rate for EXT_SUPP_RATES */
127                         break;
128                 }
129         }
130
131         if (sband->band == NL80211_BAND_2GHZ) {
132                 *pos++ = WLAN_EID_DS_PARAMS;
133                 *pos++ = 1;
134                 *pos++ = ieee80211_frequency_to_channel(
135                                 chandef->chan->center_freq);
136         }
137
138         *pos++ = WLAN_EID_IBSS_PARAMS;
139         *pos++ = 2;
140         /* FIX: set ATIM window based on scan results */
141         *pos++ = 0;
142         *pos++ = 0;
143
144         if (csa_settings) {
145                 *pos++ = WLAN_EID_CHANNEL_SWITCH;
146                 *pos++ = 3;
147                 *pos++ = csa_settings->block_tx ? 1 : 0;
148                 *pos++ = ieee80211_frequency_to_channel(
149                                 csa_settings->chandef.chan->center_freq);
150                 presp->csa_counter_offsets[0] = (pos - presp->head);
151                 *pos++ = csa_settings->count;
152                 presp->csa_current_counter = csa_settings->count;
153         }
154
155         /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
156         if (rates_n > 8) {
157                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
158                 *pos++ = rates_n - 8;
159                 for (; ri < sband->n_bitrates; ri++) {
160                         int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
161                                                 5 * (1 << shift));
162                         u8 basic = 0;
163                         if (!(rates & BIT(ri)))
164                                 continue;
165
166                         if (basic_rates & BIT(ri))
167                                 basic = 0x80;
168                         *pos++ = basic | (u8) rate;
169                 }
170         }
171
172         if (ifibss->ie_len) {
173                 memcpy(pos, ifibss->ie, ifibss->ie_len);
174                 pos += ifibss->ie_len;
175         }
176
177         /* add HT capability and information IEs */
178         if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
179             chandef->width != NL80211_CHAN_WIDTH_5 &&
180             chandef->width != NL80211_CHAN_WIDTH_10 &&
181             sband->ht_cap.ht_supported) {
182                 struct ieee80211_sta_ht_cap ht_cap;
183
184                 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
185                 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
186
187                 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
188                 /*
189                  * Note: According to 802.11n-2009 9.13.3.1, HT Protection
190                  * field and RIFS Mode are reserved in IBSS mode, therefore
191                  * keep them at 0
192                  */
193                 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
194                                                  chandef, 0, false);
195
196                 /* add VHT capability and information IEs */
197                 if (chandef->width != NL80211_CHAN_WIDTH_20 &&
198                     chandef->width != NL80211_CHAN_WIDTH_40 &&
199                     sband->vht_cap.vht_supported) {
200                         pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
201                                                          sband->vht_cap.cap);
202                         pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap,
203                                                           chandef);
204                 }
205         }
206
207         if (local->hw.queues >= IEEE80211_NUM_ACS)
208                 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */
209
210         presp->head_len = pos - presp->head;
211         if (WARN_ON(presp->head_len > frame_len))
212                 goto error;
213
214         return presp;
215 error:
216         kfree(presp);
217         return NULL;
218 }
219
220 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
221                                       const u8 *bssid, const int beacon_int,
222                                       struct cfg80211_chan_def *req_chandef,
223                                       const u32 basic_rates,
224                                       const u16 capability, u64 tsf,
225                                       bool creator)
226 {
227         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
228         struct ieee80211_local *local = sdata->local;
229         struct ieee80211_mgmt *mgmt;
230         struct cfg80211_bss *bss;
231         u32 bss_change;
232         struct cfg80211_chan_def chandef;
233         struct ieee80211_channel *chan;
234         struct beacon_data *presp;
235         struct cfg80211_inform_bss bss_meta = {};
236         bool have_higher_than_11mbit;
237         bool radar_required;
238         int err;
239
240         sdata_assert_lock(sdata);
241
242         /* Reset own TSF to allow time synchronization work. */
243         drv_reset_tsf(local, sdata);
244
245         if (!ether_addr_equal(ifibss->bssid, bssid))
246                 sta_info_flush(sdata);
247
248         /* if merging, indicate to driver that we leave the old IBSS */
249         if (sdata->vif.bss_conf.ibss_joined) {
250                 sdata->vif.bss_conf.ibss_joined = false;
251                 sdata->vif.bss_conf.ibss_creator = false;
252                 sdata->vif.bss_conf.enable_beacon = false;
253                 netif_carrier_off(sdata->dev);
254                 ieee80211_bss_info_change_notify(sdata,
255                                                  BSS_CHANGED_IBSS |
256                                                  BSS_CHANGED_BEACON_ENABLED);
257                 drv_leave_ibss(local, sdata);
258         }
259
260         presp = rcu_dereference_protected(ifibss->presp,
261                                           lockdep_is_held(&sdata->wdev.mtx));
262         RCU_INIT_POINTER(ifibss->presp, NULL);
263         if (presp)
264                 kfree_rcu(presp, rcu_head);
265
266         /* make a copy of the chandef, it could be modified below. */
267         chandef = *req_chandef;
268         chan = chandef.chan;
269         if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
270                                      NL80211_IFTYPE_ADHOC)) {
271                 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
272                     chandef.width == NL80211_CHAN_WIDTH_10 ||
273                     chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
274                     chandef.width == NL80211_CHAN_WIDTH_20) {
275                         sdata_info(sdata,
276                                    "Failed to join IBSS, beacons forbidden\n");
277                         return;
278                 }
279                 chandef.width = NL80211_CHAN_WIDTH_20;
280                 chandef.center_freq1 = chan->center_freq;
281                 /* check again for downgraded chandef */
282                 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
283                                              NL80211_IFTYPE_ADHOC)) {
284                         sdata_info(sdata,
285                                    "Failed to join IBSS, beacons forbidden\n");
286                         return;
287                 }
288         }
289
290         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
291                                             &chandef, NL80211_IFTYPE_ADHOC);
292         if (err < 0) {
293                 sdata_info(sdata,
294                            "Failed to join IBSS, invalid chandef\n");
295                 return;
296         }
297         if (err > 0 && !ifibss->userspace_handles_dfs) {
298                 sdata_info(sdata,
299                            "Failed to join IBSS, DFS channel without control program\n");
300                 return;
301         }
302
303         radar_required = err;
304
305         mutex_lock(&local->mtx);
306         if (ieee80211_vif_use_channel(sdata, &chandef,
307                                       ifibss->fixed_channel ?
308                                         IEEE80211_CHANCTX_SHARED :
309                                         IEEE80211_CHANCTX_EXCLUSIVE)) {
310                 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
311                 mutex_unlock(&local->mtx);
312                 return;
313         }
314         sdata->radar_required = radar_required;
315         mutex_unlock(&local->mtx);
316
317         memcpy(ifibss->bssid, bssid, ETH_ALEN);
318
319         presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
320                                            capability, tsf, &chandef,
321                                            &have_higher_than_11mbit, NULL);
322         if (!presp)
323                 return;
324
325         rcu_assign_pointer(ifibss->presp, presp);
326         mgmt = (void *)presp->head;
327
328         sdata->vif.bss_conf.enable_beacon = true;
329         sdata->vif.bss_conf.beacon_int = beacon_int;
330         sdata->vif.bss_conf.basic_rates = basic_rates;
331         sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
332         memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
333         bss_change = BSS_CHANGED_BEACON_INT;
334         bss_change |= ieee80211_reset_erp_info(sdata);
335         bss_change |= BSS_CHANGED_BSSID;
336         bss_change |= BSS_CHANGED_BEACON;
337         bss_change |= BSS_CHANGED_BEACON_ENABLED;
338         bss_change |= BSS_CHANGED_BASIC_RATES;
339         bss_change |= BSS_CHANGED_HT;
340         bss_change |= BSS_CHANGED_IBSS;
341         bss_change |= BSS_CHANGED_SSID;
342
343         /*
344          * In 5 GHz/802.11a, we can always use short slot time.
345          * (IEEE 802.11-2012 18.3.8.7)
346          *
347          * In 2.4GHz, we must always use long slots in IBSS for compatibility
348          * reasons.
349          * (IEEE 802.11-2012 19.4.5)
350          *
351          * HT follows these specifications (IEEE 802.11-2012 20.3.18)
352          */
353         sdata->vif.bss_conf.use_short_slot = chan->band == NL80211_BAND_5GHZ;
354         bss_change |= BSS_CHANGED_ERP_SLOT;
355
356         /* cf. IEEE 802.11 9.2.12 */
357         if (chan->band == NL80211_BAND_2GHZ && have_higher_than_11mbit)
358                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
359         else
360                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
361
362         ieee80211_set_wmm_default(sdata, true, false);
363
364         sdata->vif.bss_conf.ibss_joined = true;
365         sdata->vif.bss_conf.ibss_creator = creator;
366
367         err = drv_join_ibss(local, sdata);
368         if (err) {
369                 sdata->vif.bss_conf.ibss_joined = false;
370                 sdata->vif.bss_conf.ibss_creator = false;
371                 sdata->vif.bss_conf.enable_beacon = false;
372                 sdata->vif.bss_conf.ssid_len = 0;
373                 RCU_INIT_POINTER(ifibss->presp, NULL);
374                 kfree_rcu(presp, rcu_head);
375                 mutex_lock(&local->mtx);
376                 ieee80211_vif_release_channel(sdata);
377                 mutex_unlock(&local->mtx);
378                 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
379                            err);
380                 return;
381         }
382
383         ieee80211_bss_info_change_notify(sdata, bss_change);
384
385         ifibss->state = IEEE80211_IBSS_MLME_JOINED;
386         mod_timer(&ifibss->timer,
387                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
388
389         bss_meta.chan = chan;
390         bss_meta.scan_width = cfg80211_chandef_to_scan_width(&chandef);
391         bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt,
392                                              presp->head_len, GFP_KERNEL);
393
394         cfg80211_put_bss(local->hw.wiphy, bss);
395         netif_carrier_on(sdata->dev);
396         cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
397 }
398
399 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
400                                     struct ieee80211_bss *bss)
401 {
402         struct cfg80211_bss *cbss =
403                 container_of((void *)bss, struct cfg80211_bss, priv);
404         struct ieee80211_supported_band *sband;
405         struct cfg80211_chan_def chandef;
406         u32 basic_rates;
407         int i, j;
408         u16 beacon_int = cbss->beacon_interval;
409         const struct cfg80211_bss_ies *ies;
410         enum nl80211_channel_type chan_type;
411         u64 tsf;
412         u32 rate_flags;
413         int shift;
414
415         sdata_assert_lock(sdata);
416
417         if (beacon_int < 10)
418                 beacon_int = 10;
419
420         switch (sdata->u.ibss.chandef.width) {
421         case NL80211_CHAN_WIDTH_20_NOHT:
422         case NL80211_CHAN_WIDTH_20:
423         case NL80211_CHAN_WIDTH_40:
424                 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
425                 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
426                 break;
427         case NL80211_CHAN_WIDTH_5:
428         case NL80211_CHAN_WIDTH_10:
429                 cfg80211_chandef_create(&chandef, cbss->channel,
430                                         NL80211_CHAN_NO_HT);
431                 chandef.width = sdata->u.ibss.chandef.width;
432                 break;
433         case NL80211_CHAN_WIDTH_80:
434         case NL80211_CHAN_WIDTH_80P80:
435         case NL80211_CHAN_WIDTH_160:
436                 chandef = sdata->u.ibss.chandef;
437                 chandef.chan = cbss->channel;
438                 break;
439         default:
440                 /* fall back to 20 MHz for unsupported modes */
441                 cfg80211_chandef_create(&chandef, cbss->channel,
442                                         NL80211_CHAN_NO_HT);
443                 break;
444         }
445
446         sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
447         rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
448         shift = ieee80211_vif_get_shift(&sdata->vif);
449
450         basic_rates = 0;
451
452         for (i = 0; i < bss->supp_rates_len; i++) {
453                 int rate = bss->supp_rates[i] & 0x7f;
454                 bool is_basic = !!(bss->supp_rates[i] & 0x80);
455
456                 for (j = 0; j < sband->n_bitrates; j++) {
457                         int brate;
458                         if ((rate_flags & sband->bitrates[j].flags)
459                             != rate_flags)
460                                 continue;
461
462                         brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
463                                              5 * (1 << shift));
464                         if (brate == rate) {
465                                 if (is_basic)
466                                         basic_rates |= BIT(j);
467                                 break;
468                         }
469                 }
470         }
471
472         rcu_read_lock();
473         ies = rcu_dereference(cbss->ies);
474         tsf = ies->tsf;
475         rcu_read_unlock();
476
477         __ieee80211_sta_join_ibss(sdata, cbss->bssid,
478                                   beacon_int,
479                                   &chandef,
480                                   basic_rates,
481                                   cbss->capability,
482                                   tsf, false);
483 }
484
485 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
486                               struct cfg80211_csa_settings *csa_settings)
487 {
488         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
489         struct beacon_data *presp, *old_presp;
490         struct cfg80211_bss *cbss;
491         const struct cfg80211_bss_ies *ies;
492         u16 capability = WLAN_CAPABILITY_IBSS;
493         u64 tsf;
494         int ret = 0;
495
496         sdata_assert_lock(sdata);
497
498         if (ifibss->privacy)
499                 capability |= WLAN_CAPABILITY_PRIVACY;
500
501         cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
502                                 ifibss->bssid, ifibss->ssid,
503                                 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS,
504                                 IEEE80211_PRIVACY(ifibss->privacy));
505
506         if (WARN_ON(!cbss)) {
507                 ret = -EINVAL;
508                 goto out;
509         }
510
511         rcu_read_lock();
512         ies = rcu_dereference(cbss->ies);
513         tsf = ies->tsf;
514         rcu_read_unlock();
515         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
516
517         old_presp = rcu_dereference_protected(ifibss->presp,
518                                           lockdep_is_held(&sdata->wdev.mtx));
519
520         presp = ieee80211_ibss_build_presp(sdata,
521                                            sdata->vif.bss_conf.beacon_int,
522                                            sdata->vif.bss_conf.basic_rates,
523                                            capability, tsf, &ifibss->chandef,
524                                            NULL, csa_settings);
525         if (!presp) {
526                 ret = -ENOMEM;
527                 goto out;
528         }
529
530         rcu_assign_pointer(ifibss->presp, presp);
531         if (old_presp)
532                 kfree_rcu(old_presp, rcu_head);
533
534         return BSS_CHANGED_BEACON;
535  out:
536         return ret;
537 }
538
539 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
540 {
541         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
542         struct cfg80211_bss *cbss;
543         int err, changed = 0;
544
545         sdata_assert_lock(sdata);
546
547         /* update cfg80211 bss information with the new channel */
548         if (!is_zero_ether_addr(ifibss->bssid)) {
549                 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
550                                         ifibss->chandef.chan,
551                                         ifibss->bssid, ifibss->ssid,
552                                         ifibss->ssid_len,
553                                         IEEE80211_BSS_TYPE_IBSS,
554                                         IEEE80211_PRIVACY(ifibss->privacy));
555                 /* XXX: should not really modify cfg80211 data */
556                 if (cbss) {
557                         cbss->channel = sdata->csa_chandef.chan;
558                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
559                 }
560         }
561
562         ifibss->chandef = sdata->csa_chandef;
563
564         /* generate the beacon */
565         err = ieee80211_ibss_csa_beacon(sdata, NULL);
566         if (err < 0)
567                 return err;
568
569         changed |= err;
570
571         return changed;
572 }
573
574 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
575 {
576         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
577
578         cancel_work_sync(&ifibss->csa_connection_drop_work);
579 }
580
581 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
582         __acquires(RCU)
583 {
584         struct ieee80211_sub_if_data *sdata = sta->sdata;
585         u8 addr[ETH_ALEN];
586
587         memcpy(addr, sta->sta.addr, ETH_ALEN);
588
589         ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
590
591         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
592         sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
593         /* authorize the station only if the network is not RSN protected. If
594          * not wait for the userspace to authorize it */
595         if (!sta->sdata->u.ibss.control_port)
596                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
597
598         rate_control_rate_init(sta);
599
600         /* If it fails, maybe we raced another insertion? */
601         if (sta_info_insert_rcu(sta))
602                 return sta_info_get(sdata, addr);
603         return sta;
604 }
605
606 static struct sta_info *
607 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
608                        const u8 *addr, u32 supp_rates)
609         __acquires(RCU)
610 {
611         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
612         struct ieee80211_local *local = sdata->local;
613         struct sta_info *sta;
614         struct ieee80211_chanctx_conf *chanctx_conf;
615         struct ieee80211_supported_band *sband;
616         enum nl80211_bss_scan_width scan_width;
617         int band;
618
619         /*
620          * XXX: Consider removing the least recently used entry and
621          *      allow new one to be added.
622          */
623         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
624                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
625                                     sdata->name, addr);
626                 rcu_read_lock();
627                 return NULL;
628         }
629
630         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
631                 rcu_read_lock();
632                 return NULL;
633         }
634
635         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
636                 rcu_read_lock();
637                 return NULL;
638         }
639
640         rcu_read_lock();
641         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
642         if (WARN_ON_ONCE(!chanctx_conf))
643                 return NULL;
644         band = chanctx_conf->def.chan->band;
645         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
646         rcu_read_unlock();
647
648         sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
649         if (!sta) {
650                 rcu_read_lock();
651                 return NULL;
652         }
653
654         /* make sure mandatory rates are always added */
655         sband = local->hw.wiphy->bands[band];
656         sta->sta.supp_rates[band] = supp_rates |
657                         ieee80211_mandatory_rates(sband, scan_width);
658
659         return ieee80211_ibss_finish_sta(sta);
660 }
661
662 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
663 {
664         struct ieee80211_local *local = sdata->local;
665         int active = 0;
666         struct sta_info *sta;
667
668         sdata_assert_lock(sdata);
669
670         rcu_read_lock();
671
672         list_for_each_entry_rcu(sta, &local->sta_list, list) {
673                 unsigned long last_active = ieee80211_sta_last_active(sta);
674
675                 if (sta->sdata == sdata &&
676                     time_is_after_jiffies(last_active +
677                                           IEEE80211_IBSS_MERGE_INTERVAL)) {
678                         active++;
679                         break;
680                 }
681         }
682
683         rcu_read_unlock();
684
685         return active;
686 }
687
688 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
689 {
690         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
691         struct ieee80211_local *local = sdata->local;
692         struct cfg80211_bss *cbss;
693         struct beacon_data *presp;
694         struct sta_info *sta;
695
696         if (!is_zero_ether_addr(ifibss->bssid)) {
697                 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
698                                         ifibss->bssid, ifibss->ssid,
699                                         ifibss->ssid_len,
700                                         IEEE80211_BSS_TYPE_IBSS,
701                                         IEEE80211_PRIVACY(ifibss->privacy));
702
703                 if (cbss) {
704                         cfg80211_unlink_bss(local->hw.wiphy, cbss);
705                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
706                 }
707         }
708
709         ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
710
711         sta_info_flush(sdata);
712
713         spin_lock_bh(&ifibss->incomplete_lock);
714         while (!list_empty(&ifibss->incomplete_stations)) {
715                 sta = list_first_entry(&ifibss->incomplete_stations,
716                                        struct sta_info, list);
717                 list_del(&sta->list);
718                 spin_unlock_bh(&ifibss->incomplete_lock);
719
720                 sta_info_free(local, sta);
721                 spin_lock_bh(&ifibss->incomplete_lock);
722         }
723         spin_unlock_bh(&ifibss->incomplete_lock);
724
725         netif_carrier_off(sdata->dev);
726
727         sdata->vif.bss_conf.ibss_joined = false;
728         sdata->vif.bss_conf.ibss_creator = false;
729         sdata->vif.bss_conf.enable_beacon = false;
730         sdata->vif.bss_conf.ssid_len = 0;
731
732         /* remove beacon */
733         presp = rcu_dereference_protected(ifibss->presp,
734                                           lockdep_is_held(&sdata->wdev.mtx));
735         RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
736         if (presp)
737                 kfree_rcu(presp, rcu_head);
738
739         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
740         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
741                                                 BSS_CHANGED_IBSS);
742         drv_leave_ibss(local, sdata);
743         mutex_lock(&local->mtx);
744         ieee80211_vif_release_channel(sdata);
745         mutex_unlock(&local->mtx);
746 }
747
748 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
749 {
750         struct ieee80211_sub_if_data *sdata =
751                 container_of(work, struct ieee80211_sub_if_data,
752                              u.ibss.csa_connection_drop_work);
753
754         sdata_lock(sdata);
755
756         ieee80211_ibss_disconnect(sdata);
757         synchronize_rcu();
758         skb_queue_purge(&sdata->skb_queue);
759
760         /* trigger a scan to find another IBSS network to join */
761         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
762
763         sdata_unlock(sdata);
764 }
765
766 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
767 {
768         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
769         int err;
770
771         /* if the current channel is a DFS channel, mark the channel as
772          * unavailable.
773          */
774         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
775                                             &ifibss->chandef,
776                                             NL80211_IFTYPE_ADHOC);
777         if (err > 0)
778                 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
779                                      GFP_ATOMIC);
780 }
781
782 static bool
783 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
784                                   struct ieee802_11_elems *elems,
785                                   bool beacon)
786 {
787         struct cfg80211_csa_settings params;
788         struct ieee80211_csa_ie csa_ie;
789         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
790         enum nl80211_channel_type ch_type;
791         int err;
792         u32 sta_flags;
793
794         sdata_assert_lock(sdata);
795
796         sta_flags = IEEE80211_STA_DISABLE_VHT;
797         switch (ifibss->chandef.width) {
798         case NL80211_CHAN_WIDTH_5:
799         case NL80211_CHAN_WIDTH_10:
800         case NL80211_CHAN_WIDTH_20_NOHT:
801                 sta_flags |= IEEE80211_STA_DISABLE_HT;
802                 /* fall through */
803         case NL80211_CHAN_WIDTH_20:
804                 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
805                 break;
806         default:
807                 break;
808         }
809
810         memset(&params, 0, sizeof(params));
811         err = ieee80211_parse_ch_switch_ie(sdata, elems,
812                                            ifibss->chandef.chan->band,
813                                            sta_flags, ifibss->bssid, &csa_ie);
814         /* can't switch to destination channel, fail */
815         if (err < 0)
816                 goto disconnect;
817
818         /* did not contain a CSA */
819         if (err)
820                 return false;
821
822         /* channel switch is not supported, disconnect */
823         if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
824                 goto disconnect;
825
826         params.count = csa_ie.count;
827         params.chandef = csa_ie.chandef;
828
829         switch (ifibss->chandef.width) {
830         case NL80211_CHAN_WIDTH_20_NOHT:
831         case NL80211_CHAN_WIDTH_20:
832         case NL80211_CHAN_WIDTH_40:
833                 /* keep our current HT mode (HT20/HT40+/HT40-), even if
834                  * another mode  has been announced. The mode is not adopted
835                  * within the beacon while doing CSA and we should therefore
836                  * keep the mode which we announce.
837                  */
838                 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
839                 cfg80211_chandef_create(&params.chandef, params.chandef.chan,
840                                         ch_type);
841                 break;
842         case NL80211_CHAN_WIDTH_5:
843         case NL80211_CHAN_WIDTH_10:
844                 if (params.chandef.width != ifibss->chandef.width) {
845                         sdata_info(sdata,
846                                    "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
847                                    ifibss->bssid,
848                                    params.chandef.chan->center_freq,
849                                    params.chandef.width,
850                                    params.chandef.center_freq1,
851                                    params.chandef.center_freq2);
852                         goto disconnect;
853                 }
854                 break;
855         default:
856                 /* should not happen, sta_flags should prevent VHT modes. */
857                 WARN_ON(1);
858                 goto disconnect;
859         }
860
861         if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
862                                      NL80211_IFTYPE_ADHOC)) {
863                 sdata_info(sdata,
864                            "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
865                            ifibss->bssid,
866                            params.chandef.chan->center_freq,
867                            params.chandef.width,
868                            params.chandef.center_freq1,
869                            params.chandef.center_freq2);
870                 goto disconnect;
871         }
872
873         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
874                                             &params.chandef,
875                                             NL80211_IFTYPE_ADHOC);
876         if (err < 0)
877                 goto disconnect;
878         if (err > 0 && !ifibss->userspace_handles_dfs) {
879                 /* IBSS-DFS only allowed with a control program */
880                 goto disconnect;
881         }
882
883         params.radar_required = err;
884
885         if (cfg80211_chandef_identical(&params.chandef,
886                                        &sdata->vif.bss_conf.chandef)) {
887                 ibss_dbg(sdata,
888                          "received csa with an identical chandef, ignoring\n");
889                 return true;
890         }
891
892         /* all checks done, now perform the channel switch. */
893         ibss_dbg(sdata,
894                  "received channel switch announcement to go to channel %d MHz\n",
895                  params.chandef.chan->center_freq);
896
897         params.block_tx = !!csa_ie.mode;
898
899         if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
900                                      &params))
901                 goto disconnect;
902
903         ieee80211_ibss_csa_mark_radar(sdata);
904
905         return true;
906 disconnect:
907         ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
908         ieee80211_queue_work(&sdata->local->hw,
909                              &ifibss->csa_connection_drop_work);
910
911         ieee80211_ibss_csa_mark_radar(sdata);
912
913         return true;
914 }
915
916 static void
917 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
918                                 struct ieee80211_mgmt *mgmt, size_t len,
919                                 struct ieee80211_rx_status *rx_status,
920                                 struct ieee802_11_elems *elems)
921 {
922         int required_len;
923
924         if (len < IEEE80211_MIN_ACTION_SIZE + 1)
925                 return;
926
927         /* CSA is the only action we handle for now */
928         if (mgmt->u.action.u.measurement.action_code !=
929             WLAN_ACTION_SPCT_CHL_SWITCH)
930                 return;
931
932         required_len = IEEE80211_MIN_ACTION_SIZE +
933                        sizeof(mgmt->u.action.u.chan_switch);
934         if (len < required_len)
935                 return;
936
937         if (!sdata->vif.csa_active)
938                 ieee80211_ibss_process_chanswitch(sdata, elems, false);
939 }
940
941 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
942                                           struct ieee80211_mgmt *mgmt,
943                                           size_t len)
944 {
945         u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
946
947         if (len < IEEE80211_DEAUTH_FRAME_LEN)
948                 return;
949
950         ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
951         ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason);
952         sta_info_destroy_addr(sdata, mgmt->sa);
953 }
954
955 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
956                                         struct ieee80211_mgmt *mgmt,
957                                         size_t len)
958 {
959         u16 auth_alg, auth_transaction;
960
961         sdata_assert_lock(sdata);
962
963         if (len < 24 + 6)
964                 return;
965
966         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
967         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
968
969         ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
970         ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n",
971                  mgmt->bssid, auth_transaction);
972
973         if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
974                 return;
975
976         /*
977          * IEEE 802.11 standard does not require authentication in IBSS
978          * networks and most implementations do not seem to use it.
979          * However, try to reply to authentication attempts if someone
980          * has actually implemented this.
981          */
982         ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
983                             mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
984 }
985
986 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
987                                       struct ieee80211_mgmt *mgmt, size_t len,
988                                       struct ieee80211_rx_status *rx_status,
989                                       struct ieee802_11_elems *elems,
990                                       struct ieee80211_channel *channel)
991 {
992         struct sta_info *sta;
993         enum nl80211_band band = rx_status->band;
994         enum nl80211_bss_scan_width scan_width;
995         struct ieee80211_local *local = sdata->local;
996         struct ieee80211_supported_band *sband;
997         bool rates_updated = false;
998         u32 supp_rates = 0;
999
1000         if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1001                 return;
1002
1003         if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
1004                 return;
1005
1006         sband = local->hw.wiphy->bands[band];
1007         if (WARN_ON(!sband))
1008                 return;
1009
1010         rcu_read_lock();
1011         sta = sta_info_get(sdata, mgmt->sa);
1012
1013         if (elems->supp_rates) {
1014                 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1015                                                      band, NULL);
1016                 if (sta) {
1017                         u32 prev_rates;
1018
1019                         prev_rates = sta->sta.supp_rates[band];
1020                         /* make sure mandatory rates are always added */
1021                         scan_width = NL80211_BSS_CHAN_WIDTH_20;
1022                         if (rx_status->bw == RATE_INFO_BW_5)
1023                                 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1024                         else if (rx_status->bw == RATE_INFO_BW_10)
1025                                 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1026
1027                         sta->sta.supp_rates[band] = supp_rates |
1028                                 ieee80211_mandatory_rates(sband, scan_width);
1029                         if (sta->sta.supp_rates[band] != prev_rates) {
1030                                 ibss_dbg(sdata,
1031                                          "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1032                                          sta->sta.addr, prev_rates,
1033                                          sta->sta.supp_rates[band]);
1034                                 rates_updated = true;
1035                         }
1036                 } else {
1037                         rcu_read_unlock();
1038                         sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1039                                                      mgmt->sa, supp_rates);
1040                 }
1041         }
1042
1043         if (sta && !sta->sta.wme &&
1044             elems->wmm_info && local->hw.queues >= IEEE80211_NUM_ACS) {
1045                 sta->sta.wme = true;
1046                 ieee80211_check_fast_xmit(sta);
1047         }
1048
1049         if (sta && elems->ht_operation && elems->ht_cap_elem &&
1050             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1051             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1052             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1053                 /* we both use HT */
1054                 struct ieee80211_ht_cap htcap_ie;
1055                 struct cfg80211_chan_def chandef;
1056                 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
1057
1058                 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT);
1059                 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef);
1060
1061                 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1062                 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1063                                                                    &htcap_ie,
1064                                                                    sta);
1065
1066                 if (elems->vht_operation && elems->vht_cap_elem &&
1067                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1068                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1069                         /* we both use VHT */
1070                         struct ieee80211_vht_cap cap_ie;
1071                         struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap;
1072
1073                         ieee80211_chandef_vht_oper(elems->vht_operation,
1074                                                    &chandef);
1075                         memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1076                         ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1077                                                             &cap_ie, sta);
1078                         if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap)))
1079                                 rates_updated |= true;
1080                 }
1081
1082                 if (bw != sta->sta.bandwidth)
1083                         rates_updated |= true;
1084
1085                 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1086                                                  &chandef))
1087                         WARN_ON_ONCE(1);
1088         }
1089
1090         if (sta && rates_updated) {
1091                 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1092                 u8 rx_nss = sta->sta.rx_nss;
1093
1094                 /* Force rx_nss recalculation */
1095                 sta->sta.rx_nss = 0;
1096                 rate_control_rate_init(sta);
1097                 if (sta->sta.rx_nss != rx_nss)
1098                         changed |= IEEE80211_RC_NSS_CHANGED;
1099
1100                 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1101         }
1102
1103         rcu_read_unlock();
1104 }
1105
1106 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1107                                   struct ieee80211_mgmt *mgmt, size_t len,
1108                                   struct ieee80211_rx_status *rx_status,
1109                                   struct ieee802_11_elems *elems)
1110 {
1111         struct ieee80211_local *local = sdata->local;
1112         struct cfg80211_bss *cbss;
1113         struct ieee80211_bss *bss;
1114         struct ieee80211_channel *channel;
1115         u64 beacon_timestamp, rx_timestamp;
1116         u32 supp_rates = 0;
1117         enum nl80211_band band = rx_status->band;
1118
1119         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1120         if (!channel)
1121                 return;
1122
1123         ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1124
1125         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1126                                         channel);
1127         if (!bss)
1128                 return;
1129
1130         cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1131
1132         /* same for beacon and probe response */
1133         beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1134
1135         /* check if we need to merge IBSS */
1136
1137         /* not an IBSS */
1138         if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1139                 goto put_bss;
1140
1141         /* different channel */
1142         if (sdata->u.ibss.fixed_channel &&
1143             sdata->u.ibss.chandef.chan != cbss->channel)
1144                 goto put_bss;
1145
1146         /* different SSID */
1147         if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1148             memcmp(elems->ssid, sdata->u.ibss.ssid,
1149                                 sdata->u.ibss.ssid_len))
1150                 goto put_bss;
1151
1152         /* process channel switch */
1153         if (sdata->vif.csa_active ||
1154             ieee80211_ibss_process_chanswitch(sdata, elems, true))
1155                 goto put_bss;
1156
1157         /* same BSSID */
1158         if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1159                 goto put_bss;
1160
1161         /* we use a fixed BSSID */
1162         if (sdata->u.ibss.fixed_bssid)
1163                 goto put_bss;
1164
1165         if (ieee80211_have_rx_timestamp(rx_status)) {
1166                 /* time when timestamp field was received */
1167                 rx_timestamp =
1168                         ieee80211_calculate_rx_timestamp(local, rx_status,
1169                                                          len + FCS_LEN, 24);
1170         } else {
1171                 /*
1172                  * second best option: get current TSF
1173                  * (will return -1 if not supported)
1174                  */
1175                 rx_timestamp = drv_get_tsf(local, sdata);
1176         }
1177
1178         ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n",
1179                  mgmt->sa, mgmt->bssid,
1180                  (unsigned long long)rx_timestamp);
1181         ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n",
1182                  (unsigned long long)beacon_timestamp,
1183                  (unsigned long long)(rx_timestamp - beacon_timestamp),
1184                  jiffies);
1185
1186         if (beacon_timestamp > rx_timestamp) {
1187                 ibss_dbg(sdata,
1188                          "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1189                          mgmt->bssid);
1190                 ieee80211_sta_join_ibss(sdata, bss);
1191                 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1192                 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1193                                        supp_rates);
1194                 rcu_read_unlock();
1195         }
1196
1197  put_bss:
1198         ieee80211_rx_bss_put(local, bss);
1199 }
1200
1201 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1202                               const u8 *bssid, const u8 *addr,
1203                               u32 supp_rates)
1204 {
1205         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1206         struct ieee80211_local *local = sdata->local;
1207         struct sta_info *sta;
1208         struct ieee80211_chanctx_conf *chanctx_conf;
1209         struct ieee80211_supported_band *sband;
1210         enum nl80211_bss_scan_width scan_width;
1211         int band;
1212
1213         /*
1214          * XXX: Consider removing the least recently used entry and
1215          *      allow new one to be added.
1216          */
1217         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1218                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1219                                     sdata->name, addr);
1220                 return;
1221         }
1222
1223         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1224                 return;
1225
1226         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1227                 return;
1228
1229         rcu_read_lock();
1230         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1231         if (WARN_ON_ONCE(!chanctx_conf)) {
1232                 rcu_read_unlock();
1233                 return;
1234         }
1235         band = chanctx_conf->def.chan->band;
1236         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1237         rcu_read_unlock();
1238
1239         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1240         if (!sta)
1241                 return;
1242
1243         /* make sure mandatory rates are always added */
1244         sband = local->hw.wiphy->bands[band];
1245         sta->sta.supp_rates[band] = supp_rates |
1246                         ieee80211_mandatory_rates(sband, scan_width);
1247
1248         spin_lock(&ifibss->incomplete_lock);
1249         list_add(&sta->list, &ifibss->incomplete_stations);
1250         spin_unlock(&ifibss->incomplete_lock);
1251         ieee80211_queue_work(&local->hw, &sdata->work);
1252 }
1253
1254 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1255 {
1256         struct ieee80211_local *local = sdata->local;
1257         struct sta_info *sta, *tmp;
1258         unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1259         unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1260
1261         mutex_lock(&local->sta_mtx);
1262
1263         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1264                 unsigned long last_active = ieee80211_sta_last_active(sta);
1265
1266                 if (sdata != sta->sdata)
1267                         continue;
1268
1269                 if (time_is_before_jiffies(last_active + exp_time) ||
1270                     (time_is_before_jiffies(last_active + exp_rsn) &&
1271                      sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1272                         sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1273                                 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1274                                 "not authorized " : "", sta->sta.addr);
1275
1276                         WARN_ON(__sta_info_destroy(sta));
1277                 }
1278         }
1279
1280         mutex_unlock(&local->sta_mtx);
1281 }
1282
1283 /*
1284  * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1285  */
1286
1287 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1288 {
1289         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1290         enum nl80211_bss_scan_width scan_width;
1291
1292         sdata_assert_lock(sdata);
1293
1294         mod_timer(&ifibss->timer,
1295                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1296
1297         ieee80211_ibss_sta_expire(sdata);
1298
1299         if (time_before(jiffies, ifibss->last_scan_completed +
1300                        IEEE80211_IBSS_MERGE_INTERVAL))
1301                 return;
1302
1303         if (ieee80211_sta_active_ibss(sdata))
1304                 return;
1305
1306         if (ifibss->fixed_channel)
1307                 return;
1308
1309         sdata_info(sdata,
1310                    "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1311
1312         scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1313         ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1314                                     NULL, 0, scan_width);
1315 }
1316
1317 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1318 {
1319         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1320         u8 bssid[ETH_ALEN];
1321         u16 capability;
1322         int i;
1323
1324         sdata_assert_lock(sdata);
1325
1326         if (ifibss->fixed_bssid) {
1327                 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1328         } else {
1329                 /* Generate random, not broadcast, locally administered BSSID. Mix in
1330                  * own MAC address to make sure that devices that do not have proper
1331                  * random number generator get different BSSID. */
1332                 get_random_bytes(bssid, ETH_ALEN);
1333                 for (i = 0; i < ETH_ALEN; i++)
1334                         bssid[i] ^= sdata->vif.addr[i];
1335                 bssid[0] &= ~0x01;
1336                 bssid[0] |= 0x02;
1337         }
1338
1339         sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1340
1341         capability = WLAN_CAPABILITY_IBSS;
1342
1343         if (ifibss->privacy)
1344                 capability |= WLAN_CAPABILITY_PRIVACY;
1345
1346         __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1347                                   &ifibss->chandef, ifibss->basic_rates,
1348                                   capability, 0, true);
1349 }
1350
1351 static unsigned ibss_setup_channels(struct wiphy *wiphy,
1352                                     struct ieee80211_channel **channels,
1353                                     unsigned int channels_max,
1354                                     u32 center_freq, u32 width)
1355 {
1356         struct ieee80211_channel *chan = NULL;
1357         unsigned int n_chan = 0;
1358         u32 start_freq, end_freq, freq;
1359
1360         if (width <= 20) {
1361                 start_freq = center_freq;
1362                 end_freq = center_freq;
1363         } else {
1364                 start_freq = center_freq - width / 2 + 10;
1365                 end_freq = center_freq + width / 2 - 10;
1366         }
1367
1368         for (freq = start_freq; freq <= end_freq; freq += 20) {
1369                 chan = ieee80211_get_channel(wiphy, freq);
1370                 if (!chan)
1371                         continue;
1372                 if (n_chan >= channels_max)
1373                         return n_chan;
1374
1375                 channels[n_chan] = chan;
1376                 n_chan++;
1377         }
1378
1379         return n_chan;
1380 }
1381
1382 static unsigned int
1383 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1384                                    const struct cfg80211_chan_def *chandef,
1385                                    struct ieee80211_channel **channels,
1386                                    unsigned int channels_max)
1387 {
1388         unsigned int n_chan = 0;
1389         u32 width, cf1, cf2 = 0;
1390
1391         switch (chandef->width) {
1392         case NL80211_CHAN_WIDTH_40:
1393                 width = 40;
1394                 break;
1395         case NL80211_CHAN_WIDTH_80P80:
1396                 cf2 = chandef->center_freq2;
1397                 /* fall through */
1398         case NL80211_CHAN_WIDTH_80:
1399                 width = 80;
1400                 break;
1401         case NL80211_CHAN_WIDTH_160:
1402                 width = 160;
1403                 break;
1404         default:
1405                 width = 20;
1406                 break;
1407         }
1408
1409         cf1 = chandef->center_freq1;
1410
1411         n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1412
1413         if (cf2)
1414                 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1415                                               channels_max - n_chan, cf2,
1416                                               width);
1417
1418         return n_chan;
1419 }
1420
1421 /*
1422  * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1423  */
1424
1425 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1426 {
1427         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1428         struct ieee80211_local *local = sdata->local;
1429         struct cfg80211_bss *cbss;
1430         struct ieee80211_channel *chan = NULL;
1431         const u8 *bssid = NULL;
1432         enum nl80211_bss_scan_width scan_width;
1433         int active_ibss;
1434
1435         sdata_assert_lock(sdata);
1436
1437         active_ibss = ieee80211_sta_active_ibss(sdata);
1438         ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1439
1440         if (active_ibss)
1441                 return;
1442
1443         if (ifibss->fixed_bssid)
1444                 bssid = ifibss->bssid;
1445         if (ifibss->fixed_channel)
1446                 chan = ifibss->chandef.chan;
1447         if (!is_zero_ether_addr(ifibss->bssid))
1448                 bssid = ifibss->bssid;
1449         cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1450                                 ifibss->ssid, ifibss->ssid_len,
1451                                 IEEE80211_BSS_TYPE_IBSS,
1452                                 IEEE80211_PRIVACY(ifibss->privacy));
1453
1454         if (cbss) {
1455                 struct ieee80211_bss *bss;
1456
1457                 bss = (void *)cbss->priv;
1458                 ibss_dbg(sdata,
1459                          "sta_find_ibss: selected %pM current %pM\n",
1460                          cbss->bssid, ifibss->bssid);
1461                 sdata_info(sdata,
1462                            "Selected IBSS BSSID %pM based on configured SSID\n",
1463                            cbss->bssid);
1464
1465                 ieee80211_sta_join_ibss(sdata, bss);
1466                 ieee80211_rx_bss_put(local, bss);
1467                 return;
1468         }
1469
1470         /* if a fixed bssid and a fixed freq have been provided create the IBSS
1471          * directly and do not waste time scanning
1472          */
1473         if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1474                 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1475                            bssid);
1476                 ieee80211_sta_create_ibss(sdata);
1477                 return;
1478         }
1479
1480
1481         ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1482
1483         /* Selected IBSS not found in current scan results - try to scan */
1484         if (time_after(jiffies, ifibss->last_scan_completed +
1485                                         IEEE80211_SCAN_INTERVAL)) {
1486                 struct ieee80211_channel *channels[8];
1487                 unsigned int num;
1488
1489                 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1490
1491                 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1492
1493                 if (ifibss->fixed_channel) {
1494                         num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1495                                                                  &ifibss->chandef,
1496                                                                  channels,
1497                                                                  ARRAY_SIZE(channels));
1498                         ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1499                                                     ifibss->ssid_len, channels,
1500                                                     num, scan_width);
1501                 } else {
1502                         ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1503                                                     ifibss->ssid_len, NULL,
1504                                                     0, scan_width);
1505                 }
1506         } else {
1507                 int interval = IEEE80211_SCAN_INTERVAL;
1508
1509                 if (time_after(jiffies, ifibss->ibss_join_req +
1510                                IEEE80211_IBSS_JOIN_TIMEOUT))
1511                         ieee80211_sta_create_ibss(sdata);
1512
1513                 mod_timer(&ifibss->timer,
1514                           round_jiffies(jiffies + interval));
1515         }
1516 }
1517
1518 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1519                                         struct sk_buff *req)
1520 {
1521         struct ieee80211_mgmt *mgmt = (void *)req->data;
1522         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1523         struct ieee80211_local *local = sdata->local;
1524         int tx_last_beacon, len = req->len;
1525         struct sk_buff *skb;
1526         struct beacon_data *presp;
1527         u8 *pos, *end;
1528
1529         sdata_assert_lock(sdata);
1530
1531         presp = rcu_dereference_protected(ifibss->presp,
1532                                           lockdep_is_held(&sdata->wdev.mtx));
1533
1534         if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1535             len < 24 + 2 || !presp)
1536                 return;
1537
1538         tx_last_beacon = drv_tx_last_beacon(local);
1539
1540         ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
1541         ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n",
1542                  mgmt->bssid, tx_last_beacon);
1543
1544         if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1545                 return;
1546
1547         if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1548             !is_broadcast_ether_addr(mgmt->bssid))
1549                 return;
1550
1551         end = ((u8 *) mgmt) + len;
1552         pos = mgmt->u.probe_req.variable;
1553         if (pos[0] != WLAN_EID_SSID ||
1554             pos + 2 + pos[1] > end) {
1555                 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1556                          mgmt->sa);
1557                 return;
1558         }
1559         if (pos[1] != 0 &&
1560             (pos[1] != ifibss->ssid_len ||
1561              memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1562                 /* Ignore ProbeReq for foreign SSID */
1563                 return;
1564         }
1565
1566         /* Reply with ProbeResp */
1567         skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1568         if (!skb)
1569                 return;
1570
1571         skb_reserve(skb, local->tx_headroom);
1572         skb_put_data(skb, presp->head, presp->head_len);
1573
1574         memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1575         ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1576         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1577
1578         /* avoid excessive retries for probe request to wildcard SSIDs */
1579         if (pos[1] == 0)
1580                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1581
1582         ieee80211_tx_skb(sdata, skb);
1583 }
1584
1585 static
1586 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1587                                     struct ieee80211_mgmt *mgmt, size_t len,
1588                                     struct ieee80211_rx_status *rx_status)
1589 {
1590         size_t baselen;
1591         struct ieee802_11_elems elems;
1592
1593         BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1594                      offsetof(typeof(mgmt->u.beacon), variable));
1595
1596         /*
1597          * either beacon or probe_resp but the variable field is at the
1598          * same offset
1599          */
1600         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1601         if (baselen > len)
1602                 return;
1603
1604         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1605                                false, &elems);
1606
1607         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1608 }
1609
1610 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1611                                    struct sk_buff *skb)
1612 {
1613         struct ieee80211_rx_status *rx_status;
1614         struct ieee80211_mgmt *mgmt;
1615         u16 fc;
1616         struct ieee802_11_elems elems;
1617         int ies_len;
1618
1619         rx_status = IEEE80211_SKB_RXCB(skb);
1620         mgmt = (struct ieee80211_mgmt *) skb->data;
1621         fc = le16_to_cpu(mgmt->frame_control);
1622
1623         sdata_lock(sdata);
1624
1625         if (!sdata->u.ibss.ssid_len)
1626                 goto mgmt_out; /* not ready to merge yet */
1627
1628         switch (fc & IEEE80211_FCTL_STYPE) {
1629         case IEEE80211_STYPE_PROBE_REQ:
1630                 ieee80211_rx_mgmt_probe_req(sdata, skb);
1631                 break;
1632         case IEEE80211_STYPE_PROBE_RESP:
1633         case IEEE80211_STYPE_BEACON:
1634                 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1635                                                rx_status);
1636                 break;
1637         case IEEE80211_STYPE_AUTH:
1638                 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1639                 break;
1640         case IEEE80211_STYPE_DEAUTH:
1641                 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1642                 break;
1643         case IEEE80211_STYPE_ACTION:
1644                 switch (mgmt->u.action.category) {
1645                 case WLAN_CATEGORY_SPECTRUM_MGMT:
1646                         ies_len = skb->len -
1647                                   offsetof(struct ieee80211_mgmt,
1648                                            u.action.u.chan_switch.variable);
1649
1650                         if (ies_len < 0)
1651                                 break;
1652
1653                         ieee802_11_parse_elems(
1654                                 mgmt->u.action.u.chan_switch.variable,
1655                                 ies_len, true, &elems);
1656
1657                         if (elems.parse_error)
1658                                 break;
1659
1660                         ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1661                                                         rx_status, &elems);
1662                         break;
1663                 }
1664         }
1665
1666  mgmt_out:
1667         sdata_unlock(sdata);
1668 }
1669
1670 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1671 {
1672         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1673         struct sta_info *sta;
1674
1675         sdata_lock(sdata);
1676
1677         /*
1678          * Work could be scheduled after scan or similar
1679          * when we aren't even joined (or trying) with a
1680          * network.
1681          */
1682         if (!ifibss->ssid_len)
1683                 goto out;
1684
1685         spin_lock_bh(&ifibss->incomplete_lock);
1686         while (!list_empty(&ifibss->incomplete_stations)) {
1687                 sta = list_first_entry(&ifibss->incomplete_stations,
1688                                        struct sta_info, list);
1689                 list_del(&sta->list);
1690                 spin_unlock_bh(&ifibss->incomplete_lock);
1691
1692                 ieee80211_ibss_finish_sta(sta);
1693                 rcu_read_unlock();
1694                 spin_lock_bh(&ifibss->incomplete_lock);
1695         }
1696         spin_unlock_bh(&ifibss->incomplete_lock);
1697
1698         switch (ifibss->state) {
1699         case IEEE80211_IBSS_MLME_SEARCH:
1700                 ieee80211_sta_find_ibss(sdata);
1701                 break;
1702         case IEEE80211_IBSS_MLME_JOINED:
1703                 ieee80211_sta_merge_ibss(sdata);
1704                 break;
1705         default:
1706                 WARN_ON(1);
1707                 break;
1708         }
1709
1710  out:
1711         sdata_unlock(sdata);
1712 }
1713
1714 static void ieee80211_ibss_timer(struct timer_list *t)
1715 {
1716         struct ieee80211_sub_if_data *sdata =
1717                 from_timer(sdata, t, u.ibss.timer);
1718
1719         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1720 }
1721
1722 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1723 {
1724         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1725
1726         timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0);
1727         INIT_LIST_HEAD(&ifibss->incomplete_stations);
1728         spin_lock_init(&ifibss->incomplete_lock);
1729         INIT_WORK(&ifibss->csa_connection_drop_work,
1730                   ieee80211_csa_connection_drop_work);
1731 }
1732
1733 /* scan finished notification */
1734 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1735 {
1736         struct ieee80211_sub_if_data *sdata;
1737
1738         mutex_lock(&local->iflist_mtx);
1739         list_for_each_entry(sdata, &local->interfaces, list) {
1740                 if (!ieee80211_sdata_running(sdata))
1741                         continue;
1742                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1743                         continue;
1744                 sdata->u.ibss.last_scan_completed = jiffies;
1745         }
1746         mutex_unlock(&local->iflist_mtx);
1747 }
1748
1749 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1750                         struct cfg80211_ibss_params *params)
1751 {
1752         u32 changed = 0;
1753         u32 rate_flags;
1754         struct ieee80211_supported_band *sband;
1755         enum ieee80211_chanctx_mode chanmode;
1756         struct ieee80211_local *local = sdata->local;
1757         int radar_detect_width = 0;
1758         int i;
1759         int ret;
1760
1761         ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1762                                             &params->chandef,
1763                                             sdata->wdev.iftype);
1764         if (ret < 0)
1765                 return ret;
1766
1767         if (ret > 0) {
1768                 if (!params->userspace_handles_dfs)
1769                         return -EINVAL;
1770                 radar_detect_width = BIT(params->chandef.width);
1771         }
1772
1773         chanmode = (params->channel_fixed && !ret) ?
1774                 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1775
1776         mutex_lock(&local->chanctx_mtx);
1777         ret = ieee80211_check_combinations(sdata, &params->chandef, chanmode,
1778                                            radar_detect_width);
1779         mutex_unlock(&local->chanctx_mtx);
1780         if (ret < 0)
1781                 return ret;
1782
1783         if (params->bssid) {
1784                 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1785                 sdata->u.ibss.fixed_bssid = true;
1786         } else
1787                 sdata->u.ibss.fixed_bssid = false;
1788
1789         sdata->u.ibss.privacy = params->privacy;
1790         sdata->u.ibss.control_port = params->control_port;
1791         sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1792         sdata->u.ibss.basic_rates = params->basic_rates;
1793         sdata->u.ibss.last_scan_completed = jiffies;
1794
1795         /* fix basic_rates if channel does not support these rates */
1796         rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
1797         sband = local->hw.wiphy->bands[params->chandef.chan->band];
1798         for (i = 0; i < sband->n_bitrates; i++) {
1799                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1800                         sdata->u.ibss.basic_rates &= ~BIT(i);
1801         }
1802         memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1803                sizeof(params->mcast_rate));
1804
1805         sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1806
1807         sdata->u.ibss.chandef = params->chandef;
1808         sdata->u.ibss.fixed_channel = params->channel_fixed;
1809
1810         if (params->ie) {
1811                 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1812                                            GFP_KERNEL);
1813                 if (sdata->u.ibss.ie)
1814                         sdata->u.ibss.ie_len = params->ie_len;
1815         }
1816
1817         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1818         sdata->u.ibss.ibss_join_req = jiffies;
1819
1820         memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1821         sdata->u.ibss.ssid_len = params->ssid_len;
1822
1823         memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1824                sizeof(sdata->u.ibss.ht_capa));
1825         memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1826                sizeof(sdata->u.ibss.ht_capa_mask));
1827
1828         /*
1829          * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1830          * reserved, but an HT STA shall protect HT transmissions as though
1831          * the HT Protection field were set to non-HT mixed mode.
1832          *
1833          * In an IBSS, the RIFS Mode field of the HT Operation element is
1834          * also reserved, but an HT STA shall operate as though this field
1835          * were set to 1.
1836          */
1837
1838         sdata->vif.bss_conf.ht_operation_mode |=
1839                   IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1840                 | IEEE80211_HT_PARAM_RIFS_MODE;
1841
1842         changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE;
1843         ieee80211_bss_info_change_notify(sdata, changed);
1844
1845         sdata->smps_mode = IEEE80211_SMPS_OFF;
1846         sdata->needed_rx_chains = local->rx_chains;
1847         sdata->control_port_over_nl80211 = params->control_port_over_nl80211;
1848
1849         ieee80211_queue_work(&local->hw, &sdata->work);
1850
1851         return 0;
1852 }
1853
1854 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1855 {
1856         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1857
1858         ieee80211_ibss_disconnect(sdata);
1859         ifibss->ssid_len = 0;
1860         eth_zero_addr(ifibss->bssid);
1861
1862         /* remove beacon */
1863         kfree(sdata->u.ibss.ie);
1864
1865         /* on the next join, re-program HT parameters */
1866         memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1867         memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1868
1869         synchronize_rcu();
1870
1871         skb_queue_purge(&sdata->skb_queue);
1872
1873         del_timer_sync(&sdata->u.ibss.timer);
1874
1875         return 0;
1876 }