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Merge tag 'kbuild-thinar-v4.13' of git://git.kernel.org/pub/scm/linux/kernel/git...
[mirror_ubuntu-bionic-kernel.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 BSSID=%pM (reason: %d)\n",
951 mgmt->sa, mgmt->da, 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,
970 "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
971 mgmt->sa, mgmt->da, 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,
1179 "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1180 mgmt->sa, mgmt->bssid,
1181 (unsigned long long)rx_timestamp,
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,
1541 "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
1542 mgmt->sa, mgmt->da, 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(unsigned long data)
1715 {
1716 struct ieee80211_sub_if_data *sdata =
1717 (struct ieee80211_sub_if_data *) data;
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 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1727 (unsigned long) sdata);
1728 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1729 spin_lock_init(&ifibss->incomplete_lock);
1730 INIT_WORK(&ifibss->csa_connection_drop_work,
1731 ieee80211_csa_connection_drop_work);
1732 }
1733
1734 /* scan finished notification */
1735 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1736 {
1737 struct ieee80211_sub_if_data *sdata;
1738
1739 mutex_lock(&local->iflist_mtx);
1740 list_for_each_entry(sdata, &local->interfaces, list) {
1741 if (!ieee80211_sdata_running(sdata))
1742 continue;
1743 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1744 continue;
1745 sdata->u.ibss.last_scan_completed = jiffies;
1746 }
1747 mutex_unlock(&local->iflist_mtx);
1748 }
1749
1750 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1751 struct cfg80211_ibss_params *params)
1752 {
1753 u32 changed = 0;
1754 u32 rate_flags;
1755 struct ieee80211_supported_band *sband;
1756 enum ieee80211_chanctx_mode chanmode;
1757 struct ieee80211_local *local = sdata->local;
1758 int radar_detect_width = 0;
1759 int i;
1760 int ret;
1761
1762 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1763 &params->chandef,
1764 sdata->wdev.iftype);
1765 if (ret < 0)
1766 return ret;
1767
1768 if (ret > 0) {
1769 if (!params->userspace_handles_dfs)
1770 return -EINVAL;
1771 radar_detect_width = BIT(params->chandef.width);
1772 }
1773
1774 chanmode = (params->channel_fixed && !ret) ?
1775 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1776
1777 mutex_lock(&local->chanctx_mtx);
1778 ret = ieee80211_check_combinations(sdata, &params->chandef, chanmode,
1779 radar_detect_width);
1780 mutex_unlock(&local->chanctx_mtx);
1781 if (ret < 0)
1782 return ret;
1783
1784 if (params->bssid) {
1785 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1786 sdata->u.ibss.fixed_bssid = true;
1787 } else
1788 sdata->u.ibss.fixed_bssid = false;
1789
1790 sdata->u.ibss.privacy = params->privacy;
1791 sdata->u.ibss.control_port = params->control_port;
1792 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1793 sdata->u.ibss.basic_rates = params->basic_rates;
1794 sdata->u.ibss.last_scan_completed = jiffies;
1795
1796 /* fix basic_rates if channel does not support these rates */
1797 rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
1798 sband = local->hw.wiphy->bands[params->chandef.chan->band];
1799 for (i = 0; i < sband->n_bitrates; i++) {
1800 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1801 sdata->u.ibss.basic_rates &= ~BIT(i);
1802 }
1803 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1804 sizeof(params->mcast_rate));
1805
1806 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1807
1808 sdata->u.ibss.chandef = params->chandef;
1809 sdata->u.ibss.fixed_channel = params->channel_fixed;
1810
1811 if (params->ie) {
1812 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1813 GFP_KERNEL);
1814 if (sdata->u.ibss.ie)
1815 sdata->u.ibss.ie_len = params->ie_len;
1816 }
1817
1818 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1819 sdata->u.ibss.ibss_join_req = jiffies;
1820
1821 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1822 sdata->u.ibss.ssid_len = params->ssid_len;
1823
1824 memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1825 sizeof(sdata->u.ibss.ht_capa));
1826 memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1827 sizeof(sdata->u.ibss.ht_capa_mask));
1828
1829 /*
1830 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1831 * reserved, but an HT STA shall protect HT transmissions as though
1832 * the HT Protection field were set to non-HT mixed mode.
1833 *
1834 * In an IBSS, the RIFS Mode field of the HT Operation element is
1835 * also reserved, but an HT STA shall operate as though this field
1836 * were set to 1.
1837 */
1838
1839 sdata->vif.bss_conf.ht_operation_mode |=
1840 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1841 | IEEE80211_HT_PARAM_RIFS_MODE;
1842
1843 changed |= BSS_CHANGED_HT;
1844 ieee80211_bss_info_change_notify(sdata, changed);
1845
1846 sdata->smps_mode = IEEE80211_SMPS_OFF;
1847 sdata->needed_rx_chains = local->rx_chains;
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 }
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