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Merge tag 'for-linus' of git://linux-c6x.org/git/projects/linux-c6x-upstreaming
[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 memset(&csa_ie, 0, sizeof(csa_ie));
812 err = ieee80211_parse_ch_switch_ie(sdata, elems,
813 ifibss->chandef.chan->band,
814 sta_flags, ifibss->bssid, &csa_ie);
815 /* can't switch to destination channel, fail */
816 if (err < 0)
817 goto disconnect;
818
819 /* did not contain a CSA */
820 if (err)
821 return false;
822
823 /* channel switch is not supported, disconnect */
824 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
825 goto disconnect;
826
827 params.count = csa_ie.count;
828 params.chandef = csa_ie.chandef;
829
830 switch (ifibss->chandef.width) {
831 case NL80211_CHAN_WIDTH_20_NOHT:
832 case NL80211_CHAN_WIDTH_20:
833 case NL80211_CHAN_WIDTH_40:
834 /* keep our current HT mode (HT20/HT40+/HT40-), even if
835 * another mode has been announced. The mode is not adopted
836 * within the beacon while doing CSA and we should therefore
837 * keep the mode which we announce.
838 */
839 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
840 cfg80211_chandef_create(&params.chandef, params.chandef.chan,
841 ch_type);
842 break;
843 case NL80211_CHAN_WIDTH_5:
844 case NL80211_CHAN_WIDTH_10:
845 if (params.chandef.width != ifibss->chandef.width) {
846 sdata_info(sdata,
847 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
848 ifibss->bssid,
849 params.chandef.chan->center_freq,
850 params.chandef.width,
851 params.chandef.center_freq1,
852 params.chandef.center_freq2);
853 goto disconnect;
854 }
855 break;
856 default:
857 /* should not happen, sta_flags should prevent VHT modes. */
858 WARN_ON(1);
859 goto disconnect;
860 }
861
862 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
863 NL80211_IFTYPE_ADHOC)) {
864 sdata_info(sdata,
865 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
866 ifibss->bssid,
867 params.chandef.chan->center_freq,
868 params.chandef.width,
869 params.chandef.center_freq1,
870 params.chandef.center_freq2);
871 goto disconnect;
872 }
873
874 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
875 &params.chandef,
876 NL80211_IFTYPE_ADHOC);
877 if (err < 0)
878 goto disconnect;
879 if (err > 0 && !ifibss->userspace_handles_dfs) {
880 /* IBSS-DFS only allowed with a control program */
881 goto disconnect;
882 }
883
884 params.radar_required = err;
885
886 if (cfg80211_chandef_identical(&params.chandef,
887 &sdata->vif.bss_conf.chandef)) {
888 ibss_dbg(sdata,
889 "received csa with an identical chandef, ignoring\n");
890 return true;
891 }
892
893 /* all checks done, now perform the channel switch. */
894 ibss_dbg(sdata,
895 "received channel switch announcement to go to channel %d MHz\n",
896 params.chandef.chan->center_freq);
897
898 params.block_tx = !!csa_ie.mode;
899
900 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
901 &params))
902 goto disconnect;
903
904 ieee80211_ibss_csa_mark_radar(sdata);
905
906 return true;
907 disconnect:
908 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
909 ieee80211_queue_work(&sdata->local->hw,
910 &ifibss->csa_connection_drop_work);
911
912 ieee80211_ibss_csa_mark_radar(sdata);
913
914 return true;
915 }
916
917 static void
918 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
919 struct ieee80211_mgmt *mgmt, size_t len,
920 struct ieee80211_rx_status *rx_status,
921 struct ieee802_11_elems *elems)
922 {
923 int required_len;
924
925 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
926 return;
927
928 /* CSA is the only action we handle for now */
929 if (mgmt->u.action.u.measurement.action_code !=
930 WLAN_ACTION_SPCT_CHL_SWITCH)
931 return;
932
933 required_len = IEEE80211_MIN_ACTION_SIZE +
934 sizeof(mgmt->u.action.u.chan_switch);
935 if (len < required_len)
936 return;
937
938 if (!sdata->vif.csa_active)
939 ieee80211_ibss_process_chanswitch(sdata, elems, false);
940 }
941
942 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
943 struct ieee80211_mgmt *mgmt,
944 size_t len)
945 {
946 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
947
948 if (len < IEEE80211_DEAUTH_FRAME_LEN)
949 return;
950
951 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
952 mgmt->sa, mgmt->da, mgmt->bssid, reason);
953 sta_info_destroy_addr(sdata, mgmt->sa);
954 }
955
956 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
957 struct ieee80211_mgmt *mgmt,
958 size_t len)
959 {
960 u16 auth_alg, auth_transaction;
961
962 sdata_assert_lock(sdata);
963
964 if (len < 24 + 6)
965 return;
966
967 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
968 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
969
970 ibss_dbg(sdata,
971 "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
972 mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
973
974 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
975 return;
976
977 /*
978 * IEEE 802.11 standard does not require authentication in IBSS
979 * networks and most implementations do not seem to use it.
980 * However, try to reply to authentication attempts if someone
981 * has actually implemented this.
982 */
983 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
984 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
985 }
986
987 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
988 struct ieee80211_mgmt *mgmt, size_t len,
989 struct ieee80211_rx_status *rx_status,
990 struct ieee802_11_elems *elems,
991 struct ieee80211_channel *channel)
992 {
993 struct sta_info *sta;
994 enum nl80211_band band = rx_status->band;
995 enum nl80211_bss_scan_width scan_width;
996 struct ieee80211_local *local = sdata->local;
997 struct ieee80211_supported_band *sband;
998 bool rates_updated = false;
999 u32 supp_rates = 0;
1000
1001 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1002 return;
1003
1004 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
1005 return;
1006
1007 sband = local->hw.wiphy->bands[band];
1008 if (WARN_ON(!sband))
1009 return;
1010
1011 rcu_read_lock();
1012 sta = sta_info_get(sdata, mgmt->sa);
1013
1014 if (elems->supp_rates) {
1015 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1016 band, NULL);
1017 if (sta) {
1018 u32 prev_rates;
1019
1020 prev_rates = sta->sta.supp_rates[band];
1021 /* make sure mandatory rates are always added */
1022 scan_width = NL80211_BSS_CHAN_WIDTH_20;
1023 if (rx_status->bw == RATE_INFO_BW_5)
1024 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1025 else if (rx_status->bw == RATE_INFO_BW_10)
1026 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1027
1028 sta->sta.supp_rates[band] = supp_rates |
1029 ieee80211_mandatory_rates(sband, scan_width);
1030 if (sta->sta.supp_rates[band] != prev_rates) {
1031 ibss_dbg(sdata,
1032 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1033 sta->sta.addr, prev_rates,
1034 sta->sta.supp_rates[band]);
1035 rates_updated = true;
1036 }
1037 } else {
1038 rcu_read_unlock();
1039 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1040 mgmt->sa, supp_rates);
1041 }
1042 }
1043
1044 if (sta && !sta->sta.wme &&
1045 elems->wmm_info && local->hw.queues >= IEEE80211_NUM_ACS) {
1046 sta->sta.wme = true;
1047 ieee80211_check_fast_xmit(sta);
1048 }
1049
1050 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1051 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1052 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1053 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1054 /* we both use HT */
1055 struct ieee80211_ht_cap htcap_ie;
1056 struct cfg80211_chan_def chandef;
1057 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
1058
1059 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT);
1060 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef);
1061
1062 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1063 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1064 &htcap_ie,
1065 sta);
1066
1067 if (elems->vht_operation && elems->vht_cap_elem &&
1068 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1069 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1070 /* we both use VHT */
1071 struct ieee80211_vht_cap cap_ie;
1072 struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap;
1073
1074 ieee80211_chandef_vht_oper(elems->vht_operation,
1075 &chandef);
1076 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1077 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1078 &cap_ie, sta);
1079 if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap)))
1080 rates_updated |= true;
1081 }
1082
1083 if (bw != sta->sta.bandwidth)
1084 rates_updated |= true;
1085
1086 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1087 &chandef))
1088 WARN_ON_ONCE(1);
1089 }
1090
1091 if (sta && rates_updated) {
1092 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1093 u8 rx_nss = sta->sta.rx_nss;
1094
1095 /* Force rx_nss recalculation */
1096 sta->sta.rx_nss = 0;
1097 rate_control_rate_init(sta);
1098 if (sta->sta.rx_nss != rx_nss)
1099 changed |= IEEE80211_RC_NSS_CHANGED;
1100
1101 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1102 }
1103
1104 rcu_read_unlock();
1105 }
1106
1107 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1108 struct ieee80211_mgmt *mgmt, size_t len,
1109 struct ieee80211_rx_status *rx_status,
1110 struct ieee802_11_elems *elems)
1111 {
1112 struct ieee80211_local *local = sdata->local;
1113 struct cfg80211_bss *cbss;
1114 struct ieee80211_bss *bss;
1115 struct ieee80211_channel *channel;
1116 u64 beacon_timestamp, rx_timestamp;
1117 u32 supp_rates = 0;
1118 enum nl80211_band band = rx_status->band;
1119
1120 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1121 if (!channel)
1122 return;
1123
1124 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1125
1126 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1127 channel);
1128 if (!bss)
1129 return;
1130
1131 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1132
1133 /* same for beacon and probe response */
1134 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1135
1136 /* check if we need to merge IBSS */
1137
1138 /* not an IBSS */
1139 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1140 goto put_bss;
1141
1142 /* different channel */
1143 if (sdata->u.ibss.fixed_channel &&
1144 sdata->u.ibss.chandef.chan != cbss->channel)
1145 goto put_bss;
1146
1147 /* different SSID */
1148 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1149 memcmp(elems->ssid, sdata->u.ibss.ssid,
1150 sdata->u.ibss.ssid_len))
1151 goto put_bss;
1152
1153 /* process channel switch */
1154 if (sdata->vif.csa_active ||
1155 ieee80211_ibss_process_chanswitch(sdata, elems, true))
1156 goto put_bss;
1157
1158 /* same BSSID */
1159 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1160 goto put_bss;
1161
1162 /* we use a fixed BSSID */
1163 if (sdata->u.ibss.fixed_bssid)
1164 goto put_bss;
1165
1166 if (ieee80211_have_rx_timestamp(rx_status)) {
1167 /* time when timestamp field was received */
1168 rx_timestamp =
1169 ieee80211_calculate_rx_timestamp(local, rx_status,
1170 len + FCS_LEN, 24);
1171 } else {
1172 /*
1173 * second best option: get current TSF
1174 * (will return -1 if not supported)
1175 */
1176 rx_timestamp = drv_get_tsf(local, sdata);
1177 }
1178
1179 ibss_dbg(sdata,
1180 "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1181 mgmt->sa, mgmt->bssid,
1182 (unsigned long long)rx_timestamp,
1183 (unsigned long long)beacon_timestamp,
1184 (unsigned long long)(rx_timestamp - beacon_timestamp),
1185 jiffies);
1186
1187 if (beacon_timestamp > rx_timestamp) {
1188 ibss_dbg(sdata,
1189 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1190 mgmt->bssid);
1191 ieee80211_sta_join_ibss(sdata, bss);
1192 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1193 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1194 supp_rates);
1195 rcu_read_unlock();
1196 }
1197
1198 put_bss:
1199 ieee80211_rx_bss_put(local, bss);
1200 }
1201
1202 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1203 const u8 *bssid, const u8 *addr,
1204 u32 supp_rates)
1205 {
1206 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1207 struct ieee80211_local *local = sdata->local;
1208 struct sta_info *sta;
1209 struct ieee80211_chanctx_conf *chanctx_conf;
1210 struct ieee80211_supported_band *sband;
1211 enum nl80211_bss_scan_width scan_width;
1212 int band;
1213
1214 /*
1215 * XXX: Consider removing the least recently used entry and
1216 * allow new one to be added.
1217 */
1218 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1219 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1220 sdata->name, addr);
1221 return;
1222 }
1223
1224 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1225 return;
1226
1227 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1228 return;
1229
1230 rcu_read_lock();
1231 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1232 if (WARN_ON_ONCE(!chanctx_conf)) {
1233 rcu_read_unlock();
1234 return;
1235 }
1236 band = chanctx_conf->def.chan->band;
1237 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1238 rcu_read_unlock();
1239
1240 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1241 if (!sta)
1242 return;
1243
1244 /* make sure mandatory rates are always added */
1245 sband = local->hw.wiphy->bands[band];
1246 sta->sta.supp_rates[band] = supp_rates |
1247 ieee80211_mandatory_rates(sband, scan_width);
1248
1249 spin_lock(&ifibss->incomplete_lock);
1250 list_add(&sta->list, &ifibss->incomplete_stations);
1251 spin_unlock(&ifibss->incomplete_lock);
1252 ieee80211_queue_work(&local->hw, &sdata->work);
1253 }
1254
1255 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1256 {
1257 struct ieee80211_local *local = sdata->local;
1258 struct sta_info *sta, *tmp;
1259 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1260 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1261
1262 mutex_lock(&local->sta_mtx);
1263
1264 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1265 unsigned long last_active = ieee80211_sta_last_active(sta);
1266
1267 if (sdata != sta->sdata)
1268 continue;
1269
1270 if (time_is_before_jiffies(last_active + exp_time) ||
1271 (time_is_before_jiffies(last_active + exp_rsn) &&
1272 sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1273 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1274 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1275 "not authorized " : "", sta->sta.addr);
1276
1277 WARN_ON(__sta_info_destroy(sta));
1278 }
1279 }
1280
1281 mutex_unlock(&local->sta_mtx);
1282 }
1283
1284 /*
1285 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1286 */
1287
1288 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1289 {
1290 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1291 enum nl80211_bss_scan_width scan_width;
1292
1293 sdata_assert_lock(sdata);
1294
1295 mod_timer(&ifibss->timer,
1296 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1297
1298 ieee80211_ibss_sta_expire(sdata);
1299
1300 if (time_before(jiffies, ifibss->last_scan_completed +
1301 IEEE80211_IBSS_MERGE_INTERVAL))
1302 return;
1303
1304 if (ieee80211_sta_active_ibss(sdata))
1305 return;
1306
1307 if (ifibss->fixed_channel)
1308 return;
1309
1310 sdata_info(sdata,
1311 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1312
1313 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1314 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1315 NULL, 0, scan_width);
1316 }
1317
1318 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1319 {
1320 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1321 u8 bssid[ETH_ALEN];
1322 u16 capability;
1323 int i;
1324
1325 sdata_assert_lock(sdata);
1326
1327 if (ifibss->fixed_bssid) {
1328 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1329 } else {
1330 /* Generate random, not broadcast, locally administered BSSID. Mix in
1331 * own MAC address to make sure that devices that do not have proper
1332 * random number generator get different BSSID. */
1333 get_random_bytes(bssid, ETH_ALEN);
1334 for (i = 0; i < ETH_ALEN; i++)
1335 bssid[i] ^= sdata->vif.addr[i];
1336 bssid[0] &= ~0x01;
1337 bssid[0] |= 0x02;
1338 }
1339
1340 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1341
1342 capability = WLAN_CAPABILITY_IBSS;
1343
1344 if (ifibss->privacy)
1345 capability |= WLAN_CAPABILITY_PRIVACY;
1346
1347 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1348 &ifibss->chandef, ifibss->basic_rates,
1349 capability, 0, true);
1350 }
1351
1352 static unsigned ibss_setup_channels(struct wiphy *wiphy,
1353 struct ieee80211_channel **channels,
1354 unsigned int channels_max,
1355 u32 center_freq, u32 width)
1356 {
1357 struct ieee80211_channel *chan = NULL;
1358 unsigned int n_chan = 0;
1359 u32 start_freq, end_freq, freq;
1360
1361 if (width <= 20) {
1362 start_freq = center_freq;
1363 end_freq = center_freq;
1364 } else {
1365 start_freq = center_freq - width / 2 + 10;
1366 end_freq = center_freq + width / 2 - 10;
1367 }
1368
1369 for (freq = start_freq; freq <= end_freq; freq += 20) {
1370 chan = ieee80211_get_channel(wiphy, freq);
1371 if (!chan)
1372 continue;
1373 if (n_chan >= channels_max)
1374 return n_chan;
1375
1376 channels[n_chan] = chan;
1377 n_chan++;
1378 }
1379
1380 return n_chan;
1381 }
1382
1383 static unsigned int
1384 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1385 const struct cfg80211_chan_def *chandef,
1386 struct ieee80211_channel **channels,
1387 unsigned int channels_max)
1388 {
1389 unsigned int n_chan = 0;
1390 u32 width, cf1, cf2 = 0;
1391
1392 switch (chandef->width) {
1393 case NL80211_CHAN_WIDTH_40:
1394 width = 40;
1395 break;
1396 case NL80211_CHAN_WIDTH_80P80:
1397 cf2 = chandef->center_freq2;
1398 /* fall through */
1399 case NL80211_CHAN_WIDTH_80:
1400 width = 80;
1401 break;
1402 case NL80211_CHAN_WIDTH_160:
1403 width = 160;
1404 break;
1405 default:
1406 width = 20;
1407 break;
1408 }
1409
1410 cf1 = chandef->center_freq1;
1411
1412 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1413
1414 if (cf2)
1415 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1416 channels_max - n_chan, cf2,
1417 width);
1418
1419 return n_chan;
1420 }
1421
1422 /*
1423 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1424 */
1425
1426 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1427 {
1428 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1429 struct ieee80211_local *local = sdata->local;
1430 struct cfg80211_bss *cbss;
1431 struct ieee80211_channel *chan = NULL;
1432 const u8 *bssid = NULL;
1433 enum nl80211_bss_scan_width scan_width;
1434 int active_ibss;
1435
1436 sdata_assert_lock(sdata);
1437
1438 active_ibss = ieee80211_sta_active_ibss(sdata);
1439 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1440
1441 if (active_ibss)
1442 return;
1443
1444 if (ifibss->fixed_bssid)
1445 bssid = ifibss->bssid;
1446 if (ifibss->fixed_channel)
1447 chan = ifibss->chandef.chan;
1448 if (!is_zero_ether_addr(ifibss->bssid))
1449 bssid = ifibss->bssid;
1450 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1451 ifibss->ssid, ifibss->ssid_len,
1452 IEEE80211_BSS_TYPE_IBSS,
1453 IEEE80211_PRIVACY(ifibss->privacy));
1454
1455 if (cbss) {
1456 struct ieee80211_bss *bss;
1457
1458 bss = (void *)cbss->priv;
1459 ibss_dbg(sdata,
1460 "sta_find_ibss: selected %pM current %pM\n",
1461 cbss->bssid, ifibss->bssid);
1462 sdata_info(sdata,
1463 "Selected IBSS BSSID %pM based on configured SSID\n",
1464 cbss->bssid);
1465
1466 ieee80211_sta_join_ibss(sdata, bss);
1467 ieee80211_rx_bss_put(local, bss);
1468 return;
1469 }
1470
1471 /* if a fixed bssid and a fixed freq have been provided create the IBSS
1472 * directly and do not waste time scanning
1473 */
1474 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1475 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1476 bssid);
1477 ieee80211_sta_create_ibss(sdata);
1478 return;
1479 }
1480
1481
1482 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1483
1484 /* Selected IBSS not found in current scan results - try to scan */
1485 if (time_after(jiffies, ifibss->last_scan_completed +
1486 IEEE80211_SCAN_INTERVAL)) {
1487 struct ieee80211_channel *channels[8];
1488 unsigned int num;
1489
1490 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1491
1492 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1493
1494 if (ifibss->fixed_channel) {
1495 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1496 &ifibss->chandef,
1497 channels,
1498 ARRAY_SIZE(channels));
1499 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1500 ifibss->ssid_len, channels,
1501 num, scan_width);
1502 } else {
1503 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1504 ifibss->ssid_len, NULL,
1505 0, scan_width);
1506 }
1507 } else {
1508 int interval = IEEE80211_SCAN_INTERVAL;
1509
1510 if (time_after(jiffies, ifibss->ibss_join_req +
1511 IEEE80211_IBSS_JOIN_TIMEOUT))
1512 ieee80211_sta_create_ibss(sdata);
1513
1514 mod_timer(&ifibss->timer,
1515 round_jiffies(jiffies + interval));
1516 }
1517 }
1518
1519 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1520 struct sk_buff *req)
1521 {
1522 struct ieee80211_mgmt *mgmt = (void *)req->data;
1523 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1524 struct ieee80211_local *local = sdata->local;
1525 int tx_last_beacon, len = req->len;
1526 struct sk_buff *skb;
1527 struct beacon_data *presp;
1528 u8 *pos, *end;
1529
1530 sdata_assert_lock(sdata);
1531
1532 presp = rcu_dereference_protected(ifibss->presp,
1533 lockdep_is_held(&sdata->wdev.mtx));
1534
1535 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1536 len < 24 + 2 || !presp)
1537 return;
1538
1539 tx_last_beacon = drv_tx_last_beacon(local);
1540
1541 ibss_dbg(sdata,
1542 "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
1543 mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
1544
1545 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1546 return;
1547
1548 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1549 !is_broadcast_ether_addr(mgmt->bssid))
1550 return;
1551
1552 end = ((u8 *) mgmt) + len;
1553 pos = mgmt->u.probe_req.variable;
1554 if (pos[0] != WLAN_EID_SSID ||
1555 pos + 2 + pos[1] > end) {
1556 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1557 mgmt->sa);
1558 return;
1559 }
1560 if (pos[1] != 0 &&
1561 (pos[1] != ifibss->ssid_len ||
1562 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1563 /* Ignore ProbeReq for foreign SSID */
1564 return;
1565 }
1566
1567 /* Reply with ProbeResp */
1568 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1569 if (!skb)
1570 return;
1571
1572 skb_reserve(skb, local->tx_headroom);
1573 memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
1574
1575 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1576 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1577 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1578
1579 /* avoid excessive retries for probe request to wildcard SSIDs */
1580 if (pos[1] == 0)
1581 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1582
1583 ieee80211_tx_skb(sdata, skb);
1584 }
1585
1586 static
1587 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1588 struct ieee80211_mgmt *mgmt, size_t len,
1589 struct ieee80211_rx_status *rx_status)
1590 {
1591 size_t baselen;
1592 struct ieee802_11_elems elems;
1593
1594 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1595 offsetof(typeof(mgmt->u.beacon), variable));
1596
1597 /*
1598 * either beacon or probe_resp but the variable field is at the
1599 * same offset
1600 */
1601 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1602 if (baselen > len)
1603 return;
1604
1605 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1606 false, &elems);
1607
1608 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1609 }
1610
1611 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1612 struct sk_buff *skb)
1613 {
1614 struct ieee80211_rx_status *rx_status;
1615 struct ieee80211_mgmt *mgmt;
1616 u16 fc;
1617 struct ieee802_11_elems elems;
1618 int ies_len;
1619
1620 rx_status = IEEE80211_SKB_RXCB(skb);
1621 mgmt = (struct ieee80211_mgmt *) skb->data;
1622 fc = le16_to_cpu(mgmt->frame_control);
1623
1624 sdata_lock(sdata);
1625
1626 if (!sdata->u.ibss.ssid_len)
1627 goto mgmt_out; /* not ready to merge yet */
1628
1629 switch (fc & IEEE80211_FCTL_STYPE) {
1630 case IEEE80211_STYPE_PROBE_REQ:
1631 ieee80211_rx_mgmt_probe_req(sdata, skb);
1632 break;
1633 case IEEE80211_STYPE_PROBE_RESP:
1634 case IEEE80211_STYPE_BEACON:
1635 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1636 rx_status);
1637 break;
1638 case IEEE80211_STYPE_AUTH:
1639 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1640 break;
1641 case IEEE80211_STYPE_DEAUTH:
1642 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1643 break;
1644 case IEEE80211_STYPE_ACTION:
1645 switch (mgmt->u.action.category) {
1646 case WLAN_CATEGORY_SPECTRUM_MGMT:
1647 ies_len = skb->len -
1648 offsetof(struct ieee80211_mgmt,
1649 u.action.u.chan_switch.variable);
1650
1651 if (ies_len < 0)
1652 break;
1653
1654 ieee802_11_parse_elems(
1655 mgmt->u.action.u.chan_switch.variable,
1656 ies_len, true, &elems);
1657
1658 if (elems.parse_error)
1659 break;
1660
1661 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1662 rx_status, &elems);
1663 break;
1664 }
1665 }
1666
1667 mgmt_out:
1668 sdata_unlock(sdata);
1669 }
1670
1671 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1672 {
1673 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1674 struct sta_info *sta;
1675
1676 sdata_lock(sdata);
1677
1678 /*
1679 * Work could be scheduled after scan or similar
1680 * when we aren't even joined (or trying) with a
1681 * network.
1682 */
1683 if (!ifibss->ssid_len)
1684 goto out;
1685
1686 spin_lock_bh(&ifibss->incomplete_lock);
1687 while (!list_empty(&ifibss->incomplete_stations)) {
1688 sta = list_first_entry(&ifibss->incomplete_stations,
1689 struct sta_info, list);
1690 list_del(&sta->list);
1691 spin_unlock_bh(&ifibss->incomplete_lock);
1692
1693 ieee80211_ibss_finish_sta(sta);
1694 rcu_read_unlock();
1695 spin_lock_bh(&ifibss->incomplete_lock);
1696 }
1697 spin_unlock_bh(&ifibss->incomplete_lock);
1698
1699 switch (ifibss->state) {
1700 case IEEE80211_IBSS_MLME_SEARCH:
1701 ieee80211_sta_find_ibss(sdata);
1702 break;
1703 case IEEE80211_IBSS_MLME_JOINED:
1704 ieee80211_sta_merge_ibss(sdata);
1705 break;
1706 default:
1707 WARN_ON(1);
1708 break;
1709 }
1710
1711 out:
1712 sdata_unlock(sdata);
1713 }
1714
1715 static void ieee80211_ibss_timer(unsigned long data)
1716 {
1717 struct ieee80211_sub_if_data *sdata =
1718 (struct ieee80211_sub_if_data *) data;
1719
1720 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1721 }
1722
1723 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1724 {
1725 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1726
1727 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1728 (unsigned long) sdata);
1729 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1730 spin_lock_init(&ifibss->incomplete_lock);
1731 INIT_WORK(&ifibss->csa_connection_drop_work,
1732 ieee80211_csa_connection_drop_work);
1733 }
1734
1735 /* scan finished notification */
1736 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1737 {
1738 struct ieee80211_sub_if_data *sdata;
1739
1740 mutex_lock(&local->iflist_mtx);
1741 list_for_each_entry(sdata, &local->interfaces, list) {
1742 if (!ieee80211_sdata_running(sdata))
1743 continue;
1744 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1745 continue;
1746 sdata->u.ibss.last_scan_completed = jiffies;
1747 }
1748 mutex_unlock(&local->iflist_mtx);
1749 }
1750
1751 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1752 struct cfg80211_ibss_params *params)
1753 {
1754 u32 changed = 0;
1755 u32 rate_flags;
1756 struct ieee80211_supported_band *sband;
1757 enum ieee80211_chanctx_mode chanmode;
1758 struct ieee80211_local *local = sdata->local;
1759 int radar_detect_width = 0;
1760 int i;
1761 int ret;
1762
1763 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1764 &params->chandef,
1765 sdata->wdev.iftype);
1766 if (ret < 0)
1767 return ret;
1768
1769 if (ret > 0) {
1770 if (!params->userspace_handles_dfs)
1771 return -EINVAL;
1772 radar_detect_width = BIT(params->chandef.width);
1773 }
1774
1775 chanmode = (params->channel_fixed && !ret) ?
1776 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1777
1778 mutex_lock(&local->chanctx_mtx);
1779 ret = ieee80211_check_combinations(sdata, &params->chandef, chanmode,
1780 radar_detect_width);
1781 mutex_unlock(&local->chanctx_mtx);
1782 if (ret < 0)
1783 return ret;
1784
1785 if (params->bssid) {
1786 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1787 sdata->u.ibss.fixed_bssid = true;
1788 } else
1789 sdata->u.ibss.fixed_bssid = false;
1790
1791 sdata->u.ibss.privacy = params->privacy;
1792 sdata->u.ibss.control_port = params->control_port;
1793 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1794 sdata->u.ibss.basic_rates = params->basic_rates;
1795 sdata->u.ibss.last_scan_completed = jiffies;
1796
1797 /* fix basic_rates if channel does not support these rates */
1798 rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
1799 sband = local->hw.wiphy->bands[params->chandef.chan->band];
1800 for (i = 0; i < sband->n_bitrates; i++) {
1801 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1802 sdata->u.ibss.basic_rates &= ~BIT(i);
1803 }
1804 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1805 sizeof(params->mcast_rate));
1806
1807 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1808
1809 sdata->u.ibss.chandef = params->chandef;
1810 sdata->u.ibss.fixed_channel = params->channel_fixed;
1811
1812 if (params->ie) {
1813 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1814 GFP_KERNEL);
1815 if (sdata->u.ibss.ie)
1816 sdata->u.ibss.ie_len = params->ie_len;
1817 }
1818
1819 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1820 sdata->u.ibss.ibss_join_req = jiffies;
1821
1822 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1823 sdata->u.ibss.ssid_len = params->ssid_len;
1824
1825 memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1826 sizeof(sdata->u.ibss.ht_capa));
1827 memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1828 sizeof(sdata->u.ibss.ht_capa_mask));
1829
1830 /*
1831 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1832 * reserved, but an HT STA shall protect HT transmissions as though
1833 * the HT Protection field were set to non-HT mixed mode.
1834 *
1835 * In an IBSS, the RIFS Mode field of the HT Operation element is
1836 * also reserved, but an HT STA shall operate as though this field
1837 * were set to 1.
1838 */
1839
1840 sdata->vif.bss_conf.ht_operation_mode |=
1841 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1842 | IEEE80211_HT_PARAM_RIFS_MODE;
1843
1844 changed |= BSS_CHANGED_HT;
1845 ieee80211_bss_info_change_notify(sdata, changed);
1846
1847 sdata->smps_mode = IEEE80211_SMPS_OFF;
1848 sdata->needed_rx_chains = local->rx_chains;
1849
1850 ieee80211_queue_work(&local->hw, &sdata->work);
1851
1852 return 0;
1853 }
1854
1855 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1856 {
1857 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1858
1859 ieee80211_ibss_disconnect(sdata);
1860 ifibss->ssid_len = 0;
1861 eth_zero_addr(ifibss->bssid);
1862
1863 /* remove beacon */
1864 kfree(sdata->u.ibss.ie);
1865
1866 /* on the next join, re-program HT parameters */
1867 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1868 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1869
1870 synchronize_rcu();
1871
1872 skb_queue_purge(&sdata->skb_queue);
1873
1874 del_timer_sync(&sdata->u.ibss.timer);
1875
1876 return 0;
1877 }
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