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1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * IBSS mode implementation
4 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
5 * Copyright 2004, Instant802 Networks, Inc.
6 * Copyright 2005, Devicescape Software, Inc.
7 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
8 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
9 * Copyright 2009, Johannes Berg <johannes@sipsolutions.net>
10 * Copyright 2013-2014 Intel Mobile Communications GmbH
11 * Copyright(c) 2016 Intel Deutschland GmbH
12 * Copyright(c) 2018-2019 Intel Corporation
13 */
14
15 #include <linux/delay.h>
16 #include <linux/slab.h>
17 #include <linux/if_ether.h>
18 #include <linux/skbuff.h>
19 #include <linux/if_arp.h>
20 #include <linux/etherdevice.h>
21 #include <linux/rtnetlink.h>
22 #include <net/mac80211.h>
23
24 #include "ieee80211_i.h"
25 #include "driver-ops.h"
26 #include "rate.h"
27
28 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
29 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
30
31 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
32 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
33 #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ)
34
35 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
36
37 static struct beacon_data *
38 ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata,
39 const int beacon_int, const u32 basic_rates,
40 const u16 capability, u64 tsf,
41 struct cfg80211_chan_def *chandef,
42 bool *have_higher_than_11mbit,
43 struct cfg80211_csa_settings *csa_settings)
44 {
45 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
46 struct ieee80211_local *local = sdata->local;
47 int rates_n = 0, i, ri;
48 struct ieee80211_mgmt *mgmt;
49 u8 *pos;
50 struct ieee80211_supported_band *sband;
51 u32 rate_flags, rates = 0, rates_added = 0;
52 struct beacon_data *presp;
53 int frame_len;
54 int shift;
55
56 /* Build IBSS probe response */
57 frame_len = sizeof(struct ieee80211_hdr_3addr) +
58 12 /* struct ieee80211_mgmt.u.beacon */ +
59 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
60 2 + 8 /* max Supported Rates */ +
61 3 /* max DS params */ +
62 4 /* IBSS params */ +
63 5 /* Channel Switch Announcement */ +
64 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
65 2 + sizeof(struct ieee80211_ht_cap) +
66 2 + sizeof(struct ieee80211_ht_operation) +
67 2 + sizeof(struct ieee80211_vht_cap) +
68 2 + sizeof(struct ieee80211_vht_operation) +
69 ifibss->ie_len;
70 presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
71 if (!presp)
72 return NULL;
73
74 presp->head = (void *)(presp + 1);
75
76 mgmt = (void *) presp->head;
77 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
78 IEEE80211_STYPE_PROBE_RESP);
79 eth_broadcast_addr(mgmt->da);
80 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
81 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
82 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
83 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
84 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
85
86 pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
87
88 *pos++ = WLAN_EID_SSID;
89 *pos++ = ifibss->ssid_len;
90 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
91 pos += ifibss->ssid_len;
92
93 sband = local->hw.wiphy->bands[chandef->chan->band];
94 rate_flags = ieee80211_chandef_rate_flags(chandef);
95 shift = ieee80211_chandef_get_shift(chandef);
96 rates_n = 0;
97 if (have_higher_than_11mbit)
98 *have_higher_than_11mbit = false;
99
100 for (i = 0; i < sband->n_bitrates; i++) {
101 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
102 continue;
103 if (sband->bitrates[i].bitrate > 110 &&
104 have_higher_than_11mbit)
105 *have_higher_than_11mbit = true;
106
107 rates |= BIT(i);
108 rates_n++;
109 }
110
111 *pos++ = WLAN_EID_SUPP_RATES;
112 *pos++ = min_t(int, 8, rates_n);
113 for (ri = 0; ri < sband->n_bitrates; ri++) {
114 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
115 5 * (1 << shift));
116 u8 basic = 0;
117 if (!(rates & BIT(ri)))
118 continue;
119
120 if (basic_rates & BIT(ri))
121 basic = 0x80;
122 *pos++ = basic | (u8) rate;
123 if (++rates_added == 8) {
124 ri++; /* continue at next rate for EXT_SUPP_RATES */
125 break;
126 }
127 }
128
129 if (sband->band == NL80211_BAND_2GHZ) {
130 *pos++ = WLAN_EID_DS_PARAMS;
131 *pos++ = 1;
132 *pos++ = ieee80211_frequency_to_channel(
133 chandef->chan->center_freq);
134 }
135
136 *pos++ = WLAN_EID_IBSS_PARAMS;
137 *pos++ = 2;
138 /* FIX: set ATIM window based on scan results */
139 *pos++ = 0;
140 *pos++ = 0;
141
142 if (csa_settings) {
143 *pos++ = WLAN_EID_CHANNEL_SWITCH;
144 *pos++ = 3;
145 *pos++ = csa_settings->block_tx ? 1 : 0;
146 *pos++ = ieee80211_frequency_to_channel(
147 csa_settings->chandef.chan->center_freq);
148 presp->csa_counter_offsets[0] = (pos - presp->head);
149 *pos++ = csa_settings->count;
150 presp->csa_current_counter = csa_settings->count;
151 }
152
153 /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
154 if (rates_n > 8) {
155 *pos++ = WLAN_EID_EXT_SUPP_RATES;
156 *pos++ = rates_n - 8;
157 for (; ri < sband->n_bitrates; ri++) {
158 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
159 5 * (1 << shift));
160 u8 basic = 0;
161 if (!(rates & BIT(ri)))
162 continue;
163
164 if (basic_rates & BIT(ri))
165 basic = 0x80;
166 *pos++ = basic | (u8) rate;
167 }
168 }
169
170 if (ifibss->ie_len) {
171 memcpy(pos, ifibss->ie, ifibss->ie_len);
172 pos += ifibss->ie_len;
173 }
174
175 /* add HT capability and information IEs */
176 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
177 chandef->width != NL80211_CHAN_WIDTH_5 &&
178 chandef->width != NL80211_CHAN_WIDTH_10 &&
179 sband->ht_cap.ht_supported) {
180 struct ieee80211_sta_ht_cap ht_cap;
181
182 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
183 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
184
185 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
186 /*
187 * Note: According to 802.11n-2009 9.13.3.1, HT Protection
188 * field and RIFS Mode are reserved in IBSS mode, therefore
189 * keep them at 0
190 */
191 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
192 chandef, 0, false);
193
194 /* add VHT capability and information IEs */
195 if (chandef->width != NL80211_CHAN_WIDTH_20 &&
196 chandef->width != NL80211_CHAN_WIDTH_40 &&
197 sband->vht_cap.vht_supported) {
198 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
199 sband->vht_cap.cap);
200 pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap,
201 chandef);
202 }
203 }
204
205 if (local->hw.queues >= IEEE80211_NUM_ACS)
206 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */
207
208 presp->head_len = pos - presp->head;
209 if (WARN_ON(presp->head_len > frame_len))
210 goto error;
211
212 return presp;
213 error:
214 kfree(presp);
215 return NULL;
216 }
217
218 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
219 const u8 *bssid, const int beacon_int,
220 struct cfg80211_chan_def *req_chandef,
221 const u32 basic_rates,
222 const u16 capability, u64 tsf,
223 bool creator)
224 {
225 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
226 struct ieee80211_local *local = sdata->local;
227 struct ieee80211_mgmt *mgmt;
228 struct cfg80211_bss *bss;
229 u32 bss_change;
230 struct cfg80211_chan_def chandef;
231 struct ieee80211_channel *chan;
232 struct beacon_data *presp;
233 struct cfg80211_inform_bss bss_meta = {};
234 bool have_higher_than_11mbit;
235 bool radar_required;
236 int err;
237
238 sdata_assert_lock(sdata);
239
240 /* Reset own TSF to allow time synchronization work. */
241 drv_reset_tsf(local, sdata);
242
243 if (!ether_addr_equal(ifibss->bssid, bssid))
244 sta_info_flush(sdata);
245
246 /* if merging, indicate to driver that we leave the old IBSS */
247 if (sdata->vif.bss_conf.ibss_joined) {
248 sdata->vif.bss_conf.ibss_joined = false;
249 sdata->vif.bss_conf.ibss_creator = false;
250 sdata->vif.bss_conf.enable_beacon = false;
251 netif_carrier_off(sdata->dev);
252 ieee80211_bss_info_change_notify(sdata,
253 BSS_CHANGED_IBSS |
254 BSS_CHANGED_BEACON_ENABLED);
255 drv_leave_ibss(local, sdata);
256 }
257
258 presp = rcu_dereference_protected(ifibss->presp,
259 lockdep_is_held(&sdata->wdev.mtx));
260 RCU_INIT_POINTER(ifibss->presp, NULL);
261 if (presp)
262 kfree_rcu(presp, rcu_head);
263
264 /* make a copy of the chandef, it could be modified below. */
265 chandef = *req_chandef;
266 chan = chandef.chan;
267 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
268 NL80211_IFTYPE_ADHOC)) {
269 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
270 chandef.width == NL80211_CHAN_WIDTH_10 ||
271 chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
272 chandef.width == NL80211_CHAN_WIDTH_20) {
273 sdata_info(sdata,
274 "Failed to join IBSS, beacons forbidden\n");
275 return;
276 }
277 chandef.width = NL80211_CHAN_WIDTH_20;
278 chandef.center_freq1 = chan->center_freq;
279 /* check again for downgraded chandef */
280 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
281 NL80211_IFTYPE_ADHOC)) {
282 sdata_info(sdata,
283 "Failed to join IBSS, beacons forbidden\n");
284 return;
285 }
286 }
287
288 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
289 &chandef, NL80211_IFTYPE_ADHOC);
290 if (err < 0) {
291 sdata_info(sdata,
292 "Failed to join IBSS, invalid chandef\n");
293 return;
294 }
295 if (err > 0 && !ifibss->userspace_handles_dfs) {
296 sdata_info(sdata,
297 "Failed to join IBSS, DFS channel without control program\n");
298 return;
299 }
300
301 radar_required = err;
302
303 mutex_lock(&local->mtx);
304 if (ieee80211_vif_use_channel(sdata, &chandef,
305 ifibss->fixed_channel ?
306 IEEE80211_CHANCTX_SHARED :
307 IEEE80211_CHANCTX_EXCLUSIVE)) {
308 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
309 mutex_unlock(&local->mtx);
310 return;
311 }
312 sdata->radar_required = radar_required;
313 mutex_unlock(&local->mtx);
314
315 memcpy(ifibss->bssid, bssid, ETH_ALEN);
316
317 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
318 capability, tsf, &chandef,
319 &have_higher_than_11mbit, NULL);
320 if (!presp)
321 return;
322
323 rcu_assign_pointer(ifibss->presp, presp);
324 mgmt = (void *)presp->head;
325
326 sdata->vif.bss_conf.enable_beacon = true;
327 sdata->vif.bss_conf.beacon_int = beacon_int;
328 sdata->vif.bss_conf.basic_rates = basic_rates;
329 sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
330 memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
331 bss_change = BSS_CHANGED_BEACON_INT;
332 bss_change |= ieee80211_reset_erp_info(sdata);
333 bss_change |= BSS_CHANGED_BSSID;
334 bss_change |= BSS_CHANGED_BEACON;
335 bss_change |= BSS_CHANGED_BEACON_ENABLED;
336 bss_change |= BSS_CHANGED_BASIC_RATES;
337 bss_change |= BSS_CHANGED_HT;
338 bss_change |= BSS_CHANGED_IBSS;
339 bss_change |= BSS_CHANGED_SSID;
340
341 /*
342 * In 5 GHz/802.11a, we can always use short slot time.
343 * (IEEE 802.11-2012 18.3.8.7)
344 *
345 * In 2.4GHz, we must always use long slots in IBSS for compatibility
346 * reasons.
347 * (IEEE 802.11-2012 19.4.5)
348 *
349 * HT follows these specifications (IEEE 802.11-2012 20.3.18)
350 */
351 sdata->vif.bss_conf.use_short_slot = chan->band == NL80211_BAND_5GHZ;
352 bss_change |= BSS_CHANGED_ERP_SLOT;
353
354 /* cf. IEEE 802.11 9.2.12 */
355 if (chan->band == NL80211_BAND_2GHZ && have_higher_than_11mbit)
356 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
357 else
358 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
359
360 ieee80211_set_wmm_default(sdata, true, false);
361
362 sdata->vif.bss_conf.ibss_joined = true;
363 sdata->vif.bss_conf.ibss_creator = creator;
364
365 err = drv_join_ibss(local, sdata);
366 if (err) {
367 sdata->vif.bss_conf.ibss_joined = false;
368 sdata->vif.bss_conf.ibss_creator = false;
369 sdata->vif.bss_conf.enable_beacon = false;
370 sdata->vif.bss_conf.ssid_len = 0;
371 RCU_INIT_POINTER(ifibss->presp, NULL);
372 kfree_rcu(presp, rcu_head);
373 mutex_lock(&local->mtx);
374 ieee80211_vif_release_channel(sdata);
375 mutex_unlock(&local->mtx);
376 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
377 err);
378 return;
379 }
380
381 ieee80211_bss_info_change_notify(sdata, bss_change);
382
383 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
384 mod_timer(&ifibss->timer,
385 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
386
387 bss_meta.chan = chan;
388 bss_meta.scan_width = cfg80211_chandef_to_scan_width(&chandef);
389 bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt,
390 presp->head_len, GFP_KERNEL);
391
392 cfg80211_put_bss(local->hw.wiphy, bss);
393 netif_carrier_on(sdata->dev);
394 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
395 }
396
397 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
398 struct ieee80211_bss *bss)
399 {
400 struct cfg80211_bss *cbss =
401 container_of((void *)bss, struct cfg80211_bss, priv);
402 struct ieee80211_supported_band *sband;
403 struct cfg80211_chan_def chandef;
404 u32 basic_rates;
405 int i, j;
406 u16 beacon_int = cbss->beacon_interval;
407 const struct cfg80211_bss_ies *ies;
408 enum nl80211_channel_type chan_type;
409 u64 tsf;
410 u32 rate_flags;
411 int shift;
412
413 sdata_assert_lock(sdata);
414
415 if (beacon_int < 10)
416 beacon_int = 10;
417
418 switch (sdata->u.ibss.chandef.width) {
419 case NL80211_CHAN_WIDTH_20_NOHT:
420 case NL80211_CHAN_WIDTH_20:
421 case NL80211_CHAN_WIDTH_40:
422 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
423 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
424 break;
425 case NL80211_CHAN_WIDTH_5:
426 case NL80211_CHAN_WIDTH_10:
427 cfg80211_chandef_create(&chandef, cbss->channel,
428 NL80211_CHAN_NO_HT);
429 chandef.width = sdata->u.ibss.chandef.width;
430 break;
431 case NL80211_CHAN_WIDTH_80:
432 case NL80211_CHAN_WIDTH_80P80:
433 case NL80211_CHAN_WIDTH_160:
434 chandef = sdata->u.ibss.chandef;
435 chandef.chan = cbss->channel;
436 break;
437 default:
438 /* fall back to 20 MHz for unsupported modes */
439 cfg80211_chandef_create(&chandef, cbss->channel,
440 NL80211_CHAN_NO_HT);
441 break;
442 }
443
444 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
445 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
446 shift = ieee80211_vif_get_shift(&sdata->vif);
447
448 basic_rates = 0;
449
450 for (i = 0; i < bss->supp_rates_len; i++) {
451 int rate = bss->supp_rates[i] & 0x7f;
452 bool is_basic = !!(bss->supp_rates[i] & 0x80);
453
454 for (j = 0; j < sband->n_bitrates; j++) {
455 int brate;
456 if ((rate_flags & sband->bitrates[j].flags)
457 != rate_flags)
458 continue;
459
460 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
461 5 * (1 << shift));
462 if (brate == rate) {
463 if (is_basic)
464 basic_rates |= BIT(j);
465 break;
466 }
467 }
468 }
469
470 rcu_read_lock();
471 ies = rcu_dereference(cbss->ies);
472 tsf = ies->tsf;
473 rcu_read_unlock();
474
475 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
476 beacon_int,
477 &chandef,
478 basic_rates,
479 cbss->capability,
480 tsf, false);
481 }
482
483 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
484 struct cfg80211_csa_settings *csa_settings)
485 {
486 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
487 struct beacon_data *presp, *old_presp;
488 struct cfg80211_bss *cbss;
489 const struct cfg80211_bss_ies *ies;
490 u16 capability = WLAN_CAPABILITY_IBSS;
491 u64 tsf;
492 int ret = 0;
493
494 sdata_assert_lock(sdata);
495
496 if (ifibss->privacy)
497 capability |= WLAN_CAPABILITY_PRIVACY;
498
499 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
500 ifibss->bssid, ifibss->ssid,
501 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS,
502 IEEE80211_PRIVACY(ifibss->privacy));
503
504 if (WARN_ON(!cbss)) {
505 ret = -EINVAL;
506 goto out;
507 }
508
509 rcu_read_lock();
510 ies = rcu_dereference(cbss->ies);
511 tsf = ies->tsf;
512 rcu_read_unlock();
513 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
514
515 old_presp = rcu_dereference_protected(ifibss->presp,
516 lockdep_is_held(&sdata->wdev.mtx));
517
518 presp = ieee80211_ibss_build_presp(sdata,
519 sdata->vif.bss_conf.beacon_int,
520 sdata->vif.bss_conf.basic_rates,
521 capability, tsf, &ifibss->chandef,
522 NULL, csa_settings);
523 if (!presp) {
524 ret = -ENOMEM;
525 goto out;
526 }
527
528 rcu_assign_pointer(ifibss->presp, presp);
529 if (old_presp)
530 kfree_rcu(old_presp, rcu_head);
531
532 return BSS_CHANGED_BEACON;
533 out:
534 return ret;
535 }
536
537 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
538 {
539 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
540 struct cfg80211_bss *cbss;
541 int err, changed = 0;
542
543 sdata_assert_lock(sdata);
544
545 /* update cfg80211 bss information with the new channel */
546 if (!is_zero_ether_addr(ifibss->bssid)) {
547 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
548 ifibss->chandef.chan,
549 ifibss->bssid, ifibss->ssid,
550 ifibss->ssid_len,
551 IEEE80211_BSS_TYPE_IBSS,
552 IEEE80211_PRIVACY(ifibss->privacy));
553 /* XXX: should not really modify cfg80211 data */
554 if (cbss) {
555 cbss->channel = sdata->csa_chandef.chan;
556 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
557 }
558 }
559
560 ifibss->chandef = sdata->csa_chandef;
561
562 /* generate the beacon */
563 err = ieee80211_ibss_csa_beacon(sdata, NULL);
564 if (err < 0)
565 return err;
566
567 changed |= err;
568
569 return changed;
570 }
571
572 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
573 {
574 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
575
576 cancel_work_sync(&ifibss->csa_connection_drop_work);
577 }
578
579 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
580 __acquires(RCU)
581 {
582 struct ieee80211_sub_if_data *sdata = sta->sdata;
583 u8 addr[ETH_ALEN];
584
585 memcpy(addr, sta->sta.addr, ETH_ALEN);
586
587 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
588
589 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
590 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
591 /* authorize the station only if the network is not RSN protected. If
592 * not wait for the userspace to authorize it */
593 if (!sta->sdata->u.ibss.control_port)
594 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
595
596 rate_control_rate_init(sta);
597
598 /* If it fails, maybe we raced another insertion? */
599 if (sta_info_insert_rcu(sta))
600 return sta_info_get(sdata, addr);
601 return sta;
602 }
603
604 static struct sta_info *
605 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
606 const u8 *addr, u32 supp_rates)
607 __acquires(RCU)
608 {
609 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
610 struct ieee80211_local *local = sdata->local;
611 struct sta_info *sta;
612 struct ieee80211_chanctx_conf *chanctx_conf;
613 struct ieee80211_supported_band *sband;
614 enum nl80211_bss_scan_width scan_width;
615 int band;
616
617 /*
618 * XXX: Consider removing the least recently used entry and
619 * allow new one to be added.
620 */
621 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
622 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
623 sdata->name, addr);
624 rcu_read_lock();
625 return NULL;
626 }
627
628 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
629 rcu_read_lock();
630 return NULL;
631 }
632
633 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
634 rcu_read_lock();
635 return NULL;
636 }
637
638 rcu_read_lock();
639 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
640 if (WARN_ON_ONCE(!chanctx_conf))
641 return NULL;
642 band = chanctx_conf->def.chan->band;
643 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
644 rcu_read_unlock();
645
646 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
647 if (!sta) {
648 rcu_read_lock();
649 return NULL;
650 }
651
652 /* make sure mandatory rates are always added */
653 sband = local->hw.wiphy->bands[band];
654 sta->sta.supp_rates[band] = supp_rates |
655 ieee80211_mandatory_rates(sband, scan_width);
656
657 return ieee80211_ibss_finish_sta(sta);
658 }
659
660 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
661 {
662 struct ieee80211_local *local = sdata->local;
663 int active = 0;
664 struct sta_info *sta;
665
666 sdata_assert_lock(sdata);
667
668 rcu_read_lock();
669
670 list_for_each_entry_rcu(sta, &local->sta_list, list) {
671 unsigned long last_active = ieee80211_sta_last_active(sta);
672
673 if (sta->sdata == sdata &&
674 time_is_after_jiffies(last_active +
675 IEEE80211_IBSS_MERGE_INTERVAL)) {
676 active++;
677 break;
678 }
679 }
680
681 rcu_read_unlock();
682
683 return active;
684 }
685
686 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
687 {
688 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
689 struct ieee80211_local *local = sdata->local;
690 struct cfg80211_bss *cbss;
691 struct beacon_data *presp;
692 struct sta_info *sta;
693
694 if (!is_zero_ether_addr(ifibss->bssid)) {
695 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
696 ifibss->bssid, ifibss->ssid,
697 ifibss->ssid_len,
698 IEEE80211_BSS_TYPE_IBSS,
699 IEEE80211_PRIVACY(ifibss->privacy));
700
701 if (cbss) {
702 cfg80211_unlink_bss(local->hw.wiphy, cbss);
703 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
704 }
705 }
706
707 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
708
709 sta_info_flush(sdata);
710
711 spin_lock_bh(&ifibss->incomplete_lock);
712 while (!list_empty(&ifibss->incomplete_stations)) {
713 sta = list_first_entry(&ifibss->incomplete_stations,
714 struct sta_info, list);
715 list_del(&sta->list);
716 spin_unlock_bh(&ifibss->incomplete_lock);
717
718 sta_info_free(local, sta);
719 spin_lock_bh(&ifibss->incomplete_lock);
720 }
721 spin_unlock_bh(&ifibss->incomplete_lock);
722
723 netif_carrier_off(sdata->dev);
724
725 sdata->vif.bss_conf.ibss_joined = false;
726 sdata->vif.bss_conf.ibss_creator = false;
727 sdata->vif.bss_conf.enable_beacon = false;
728 sdata->vif.bss_conf.ssid_len = 0;
729
730 /* remove beacon */
731 presp = rcu_dereference_protected(ifibss->presp,
732 lockdep_is_held(&sdata->wdev.mtx));
733 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
734 if (presp)
735 kfree_rcu(presp, rcu_head);
736
737 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
738 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
739 BSS_CHANGED_IBSS);
740 drv_leave_ibss(local, sdata);
741 mutex_lock(&local->mtx);
742 ieee80211_vif_release_channel(sdata);
743 mutex_unlock(&local->mtx);
744 }
745
746 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
747 {
748 struct ieee80211_sub_if_data *sdata =
749 container_of(work, struct ieee80211_sub_if_data,
750 u.ibss.csa_connection_drop_work);
751
752 sdata_lock(sdata);
753
754 ieee80211_ibss_disconnect(sdata);
755 synchronize_rcu();
756 skb_queue_purge(&sdata->skb_queue);
757
758 /* trigger a scan to find another IBSS network to join */
759 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
760
761 sdata_unlock(sdata);
762 }
763
764 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
765 {
766 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
767 int err;
768
769 /* if the current channel is a DFS channel, mark the channel as
770 * unavailable.
771 */
772 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
773 &ifibss->chandef,
774 NL80211_IFTYPE_ADHOC);
775 if (err > 0)
776 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
777 GFP_ATOMIC);
778 }
779
780 static bool
781 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
782 struct ieee802_11_elems *elems,
783 bool beacon)
784 {
785 struct cfg80211_csa_settings params;
786 struct ieee80211_csa_ie csa_ie;
787 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
788 enum nl80211_channel_type ch_type;
789 int err;
790 u32 sta_flags;
791
792 sdata_assert_lock(sdata);
793
794 sta_flags = IEEE80211_STA_DISABLE_VHT;
795 switch (ifibss->chandef.width) {
796 case NL80211_CHAN_WIDTH_5:
797 case NL80211_CHAN_WIDTH_10:
798 case NL80211_CHAN_WIDTH_20_NOHT:
799 sta_flags |= IEEE80211_STA_DISABLE_HT;
800 /* fall through */
801 case NL80211_CHAN_WIDTH_20:
802 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
803 break;
804 default:
805 break;
806 }
807
808 memset(&params, 0, sizeof(params));
809 err = ieee80211_parse_ch_switch_ie(sdata, elems,
810 ifibss->chandef.chan->band,
811 sta_flags, ifibss->bssid, &csa_ie);
812 /* can't switch to destination channel, fail */
813 if (err < 0)
814 goto disconnect;
815
816 /* did not contain a CSA */
817 if (err)
818 return false;
819
820 /* channel switch is not supported, disconnect */
821 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
822 goto disconnect;
823
824 params.count = csa_ie.count;
825 params.chandef = csa_ie.chandef;
826
827 switch (ifibss->chandef.width) {
828 case NL80211_CHAN_WIDTH_20_NOHT:
829 case NL80211_CHAN_WIDTH_20:
830 case NL80211_CHAN_WIDTH_40:
831 /* keep our current HT mode (HT20/HT40+/HT40-), even if
832 * another mode has been announced. The mode is not adopted
833 * within the beacon while doing CSA and we should therefore
834 * keep the mode which we announce.
835 */
836 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
837 cfg80211_chandef_create(&params.chandef, params.chandef.chan,
838 ch_type);
839 break;
840 case NL80211_CHAN_WIDTH_5:
841 case NL80211_CHAN_WIDTH_10:
842 if (params.chandef.width != ifibss->chandef.width) {
843 sdata_info(sdata,
844 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
845 ifibss->bssid,
846 params.chandef.chan->center_freq,
847 params.chandef.width,
848 params.chandef.center_freq1,
849 params.chandef.center_freq2);
850 goto disconnect;
851 }
852 break;
853 default:
854 /* should not happen, sta_flags should prevent VHT modes. */
855 WARN_ON(1);
856 goto disconnect;
857 }
858
859 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
860 NL80211_IFTYPE_ADHOC)) {
861 sdata_info(sdata,
862 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
863 ifibss->bssid,
864 params.chandef.chan->center_freq,
865 params.chandef.width,
866 params.chandef.center_freq1,
867 params.chandef.center_freq2);
868 goto disconnect;
869 }
870
871 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
872 &params.chandef,
873 NL80211_IFTYPE_ADHOC);
874 if (err < 0)
875 goto disconnect;
876 if (err > 0 && !ifibss->userspace_handles_dfs) {
877 /* IBSS-DFS only allowed with a control program */
878 goto disconnect;
879 }
880
881 params.radar_required = err;
882
883 if (cfg80211_chandef_identical(&params.chandef,
884 &sdata->vif.bss_conf.chandef)) {
885 ibss_dbg(sdata,
886 "received csa with an identical chandef, ignoring\n");
887 return true;
888 }
889
890 /* all checks done, now perform the channel switch. */
891 ibss_dbg(sdata,
892 "received channel switch announcement to go to channel %d MHz\n",
893 params.chandef.chan->center_freq);
894
895 params.block_tx = !!csa_ie.mode;
896
897 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
898 &params))
899 goto disconnect;
900
901 ieee80211_ibss_csa_mark_radar(sdata);
902
903 return true;
904 disconnect:
905 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
906 ieee80211_queue_work(&sdata->local->hw,
907 &ifibss->csa_connection_drop_work);
908
909 ieee80211_ibss_csa_mark_radar(sdata);
910
911 return true;
912 }
913
914 static void
915 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
916 struct ieee80211_mgmt *mgmt, size_t len,
917 struct ieee80211_rx_status *rx_status,
918 struct ieee802_11_elems *elems)
919 {
920 int required_len;
921
922 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
923 return;
924
925 /* CSA is the only action we handle for now */
926 if (mgmt->u.action.u.measurement.action_code !=
927 WLAN_ACTION_SPCT_CHL_SWITCH)
928 return;
929
930 required_len = IEEE80211_MIN_ACTION_SIZE +
931 sizeof(mgmt->u.action.u.chan_switch);
932 if (len < required_len)
933 return;
934
935 if (!sdata->vif.csa_active)
936 ieee80211_ibss_process_chanswitch(sdata, elems, false);
937 }
938
939 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
940 struct ieee80211_mgmt *mgmt,
941 size_t len)
942 {
943 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
944
945 if (len < IEEE80211_DEAUTH_FRAME_LEN)
946 return;
947
948 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
949 ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason);
950 sta_info_destroy_addr(sdata, mgmt->sa);
951 }
952
953 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
954 struct ieee80211_mgmt *mgmt,
955 size_t len)
956 {
957 u16 auth_alg, auth_transaction;
958
959 sdata_assert_lock(sdata);
960
961 if (len < 24 + 6)
962 return;
963
964 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
965 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
966
967 ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
968 ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n",
969 mgmt->bssid, auth_transaction);
970
971 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
972 return;
973
974 /*
975 * IEEE 802.11 standard does not require authentication in IBSS
976 * networks and most implementations do not seem to use it.
977 * However, try to reply to authentication attempts if someone
978 * has actually implemented this.
979 */
980 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
981 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
982 }
983
984 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
985 struct ieee80211_mgmt *mgmt, size_t len,
986 struct ieee80211_rx_status *rx_status,
987 struct ieee802_11_elems *elems,
988 struct ieee80211_channel *channel)
989 {
990 struct sta_info *sta;
991 enum nl80211_band band = rx_status->band;
992 enum nl80211_bss_scan_width scan_width;
993 struct ieee80211_local *local = sdata->local;
994 struct ieee80211_supported_band *sband;
995 bool rates_updated = false;
996 u32 supp_rates = 0;
997
998 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
999 return;
1000
1001 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
1002 return;
1003
1004 sband = local->hw.wiphy->bands[band];
1005 if (WARN_ON(!sband))
1006 return;
1007
1008 rcu_read_lock();
1009 sta = sta_info_get(sdata, mgmt->sa);
1010
1011 if (elems->supp_rates) {
1012 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1013 band, NULL);
1014 if (sta) {
1015 u32 prev_rates;
1016
1017 prev_rates = sta->sta.supp_rates[band];
1018 /* make sure mandatory rates are always added */
1019 scan_width = NL80211_BSS_CHAN_WIDTH_20;
1020 if (rx_status->bw == RATE_INFO_BW_5)
1021 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1022 else if (rx_status->bw == RATE_INFO_BW_10)
1023 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1024
1025 sta->sta.supp_rates[band] = supp_rates |
1026 ieee80211_mandatory_rates(sband, scan_width);
1027 if (sta->sta.supp_rates[band] != prev_rates) {
1028 ibss_dbg(sdata,
1029 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1030 sta->sta.addr, prev_rates,
1031 sta->sta.supp_rates[band]);
1032 rates_updated = true;
1033 }
1034 } else {
1035 rcu_read_unlock();
1036 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1037 mgmt->sa, supp_rates);
1038 }
1039 }
1040
1041 if (sta && !sta->sta.wme &&
1042 elems->wmm_info && local->hw.queues >= IEEE80211_NUM_ACS) {
1043 sta->sta.wme = true;
1044 ieee80211_check_fast_xmit(sta);
1045 }
1046
1047 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1048 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1049 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1050 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1051 /* we both use HT */
1052 struct ieee80211_ht_cap htcap_ie;
1053 struct cfg80211_chan_def chandef;
1054 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
1055
1056 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT);
1057 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef);
1058
1059 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1060 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1061 &htcap_ie,
1062 sta);
1063
1064 if (elems->vht_operation && elems->vht_cap_elem &&
1065 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1066 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1067 /* we both use VHT */
1068 struct ieee80211_vht_cap cap_ie;
1069 struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap;
1070
1071 ieee80211_chandef_vht_oper(&local->hw,
1072 elems->vht_operation,
1073 elems->ht_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, channel);
1126 if (!bss)
1127 return;
1128
1129 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1130
1131 /* same for beacon and probe response */
1132 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1133
1134 /* check if we need to merge IBSS */
1135
1136 /* not an IBSS */
1137 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1138 goto put_bss;
1139
1140 /* different channel */
1141 if (sdata->u.ibss.fixed_channel &&
1142 sdata->u.ibss.chandef.chan != cbss->channel)
1143 goto put_bss;
1144
1145 /* different SSID */
1146 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1147 memcmp(elems->ssid, sdata->u.ibss.ssid,
1148 sdata->u.ibss.ssid_len))
1149 goto put_bss;
1150
1151 /* process channel switch */
1152 if (sdata->vif.csa_active ||
1153 ieee80211_ibss_process_chanswitch(sdata, elems, true))
1154 goto put_bss;
1155
1156 /* same BSSID */
1157 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1158 goto put_bss;
1159
1160 /* we use a fixed BSSID */
1161 if (sdata->u.ibss.fixed_bssid)
1162 goto put_bss;
1163
1164 if (ieee80211_have_rx_timestamp(rx_status)) {
1165 /* time when timestamp field was received */
1166 rx_timestamp =
1167 ieee80211_calculate_rx_timestamp(local, rx_status,
1168 len + FCS_LEN, 24);
1169 } else {
1170 /*
1171 * second best option: get current TSF
1172 * (will return -1 if not supported)
1173 */
1174 rx_timestamp = drv_get_tsf(local, sdata);
1175 }
1176
1177 ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n",
1178 mgmt->sa, mgmt->bssid,
1179 (unsigned long long)rx_timestamp);
1180 ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n",
1181 (unsigned long long)beacon_timestamp,
1182 (unsigned long long)(rx_timestamp - beacon_timestamp),
1183 jiffies);
1184
1185 if (beacon_timestamp > rx_timestamp) {
1186 ibss_dbg(sdata,
1187 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1188 mgmt->bssid);
1189 ieee80211_sta_join_ibss(sdata, bss);
1190 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1191 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1192 supp_rates);
1193 rcu_read_unlock();
1194 }
1195
1196 put_bss:
1197 ieee80211_rx_bss_put(local, bss);
1198 }
1199
1200 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1201 const u8 *bssid, const u8 *addr,
1202 u32 supp_rates)
1203 {
1204 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1205 struct ieee80211_local *local = sdata->local;
1206 struct sta_info *sta;
1207 struct ieee80211_chanctx_conf *chanctx_conf;
1208 struct ieee80211_supported_band *sband;
1209 enum nl80211_bss_scan_width scan_width;
1210 int band;
1211
1212 /*
1213 * XXX: Consider removing the least recently used entry and
1214 * allow new one to be added.
1215 */
1216 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1217 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1218 sdata->name, addr);
1219 return;
1220 }
1221
1222 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1223 return;
1224
1225 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1226 return;
1227
1228 rcu_read_lock();
1229 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1230 if (WARN_ON_ONCE(!chanctx_conf)) {
1231 rcu_read_unlock();
1232 return;
1233 }
1234 band = chanctx_conf->def.chan->band;
1235 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1236 rcu_read_unlock();
1237
1238 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1239 if (!sta)
1240 return;
1241
1242 /* make sure mandatory rates are always added */
1243 sband = local->hw.wiphy->bands[band];
1244 sta->sta.supp_rates[band] = supp_rates |
1245 ieee80211_mandatory_rates(sband, scan_width);
1246
1247 spin_lock(&ifibss->incomplete_lock);
1248 list_add(&sta->list, &ifibss->incomplete_stations);
1249 spin_unlock(&ifibss->incomplete_lock);
1250 ieee80211_queue_work(&local->hw, &sdata->work);
1251 }
1252
1253 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1254 {
1255 struct ieee80211_local *local = sdata->local;
1256 struct sta_info *sta, *tmp;
1257 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1258 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1259
1260 mutex_lock(&local->sta_mtx);
1261
1262 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1263 unsigned long last_active = ieee80211_sta_last_active(sta);
1264
1265 if (sdata != sta->sdata)
1266 continue;
1267
1268 if (time_is_before_jiffies(last_active + exp_time) ||
1269 (time_is_before_jiffies(last_active + exp_rsn) &&
1270 sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1271 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1272 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1273 "not authorized " : "", sta->sta.addr);
1274
1275 WARN_ON(__sta_info_destroy(sta));
1276 }
1277 }
1278
1279 mutex_unlock(&local->sta_mtx);
1280 }
1281
1282 /*
1283 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1284 */
1285
1286 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1287 {
1288 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1289 enum nl80211_bss_scan_width scan_width;
1290
1291 sdata_assert_lock(sdata);
1292
1293 mod_timer(&ifibss->timer,
1294 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1295
1296 ieee80211_ibss_sta_expire(sdata);
1297
1298 if (time_before(jiffies, ifibss->last_scan_completed +
1299 IEEE80211_IBSS_MERGE_INTERVAL))
1300 return;
1301
1302 if (ieee80211_sta_active_ibss(sdata))
1303 return;
1304
1305 if (ifibss->fixed_channel)
1306 return;
1307
1308 sdata_info(sdata,
1309 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1310
1311 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1312 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1313 NULL, 0, scan_width);
1314 }
1315
1316 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1317 {
1318 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1319 u8 bssid[ETH_ALEN];
1320 u16 capability;
1321 int i;
1322
1323 sdata_assert_lock(sdata);
1324
1325 if (ifibss->fixed_bssid) {
1326 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1327 } else {
1328 /* Generate random, not broadcast, locally administered BSSID. Mix in
1329 * own MAC address to make sure that devices that do not have proper
1330 * random number generator get different BSSID. */
1331 get_random_bytes(bssid, ETH_ALEN);
1332 for (i = 0; i < ETH_ALEN; i++)
1333 bssid[i] ^= sdata->vif.addr[i];
1334 bssid[0] &= ~0x01;
1335 bssid[0] |= 0x02;
1336 }
1337
1338 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1339
1340 capability = WLAN_CAPABILITY_IBSS;
1341
1342 if (ifibss->privacy)
1343 capability |= WLAN_CAPABILITY_PRIVACY;
1344
1345 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1346 &ifibss->chandef, ifibss->basic_rates,
1347 capability, 0, true);
1348 }
1349
1350 static unsigned ibss_setup_channels(struct wiphy *wiphy,
1351 struct ieee80211_channel **channels,
1352 unsigned int channels_max,
1353 u32 center_freq, u32 width)
1354 {
1355 struct ieee80211_channel *chan = NULL;
1356 unsigned int n_chan = 0;
1357 u32 start_freq, end_freq, freq;
1358
1359 if (width <= 20) {
1360 start_freq = center_freq;
1361 end_freq = center_freq;
1362 } else {
1363 start_freq = center_freq - width / 2 + 10;
1364 end_freq = center_freq + width / 2 - 10;
1365 }
1366
1367 for (freq = start_freq; freq <= end_freq; freq += 20) {
1368 chan = ieee80211_get_channel(wiphy, freq);
1369 if (!chan)
1370 continue;
1371 if (n_chan >= channels_max)
1372 return n_chan;
1373
1374 channels[n_chan] = chan;
1375 n_chan++;
1376 }
1377
1378 return n_chan;
1379 }
1380
1381 static unsigned int
1382 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1383 const struct cfg80211_chan_def *chandef,
1384 struct ieee80211_channel **channels,
1385 unsigned int channels_max)
1386 {
1387 unsigned int n_chan = 0;
1388 u32 width, cf1, cf2 = 0;
1389
1390 switch (chandef->width) {
1391 case NL80211_CHAN_WIDTH_40:
1392 width = 40;
1393 break;
1394 case NL80211_CHAN_WIDTH_80P80:
1395 cf2 = chandef->center_freq2;
1396 /* fall through */
1397 case NL80211_CHAN_WIDTH_80:
1398 width = 80;
1399 break;
1400 case NL80211_CHAN_WIDTH_160:
1401 width = 160;
1402 break;
1403 default:
1404 width = 20;
1405 break;
1406 }
1407
1408 cf1 = chandef->center_freq1;
1409
1410 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1411
1412 if (cf2)
1413 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1414 channels_max - n_chan, cf2,
1415 width);
1416
1417 return n_chan;
1418 }
1419
1420 /*
1421 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1422 */
1423
1424 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1425 {
1426 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1427 struct ieee80211_local *local = sdata->local;
1428 struct cfg80211_bss *cbss;
1429 struct ieee80211_channel *chan = NULL;
1430 const u8 *bssid = NULL;
1431 enum nl80211_bss_scan_width scan_width;
1432 int active_ibss;
1433
1434 sdata_assert_lock(sdata);
1435
1436 active_ibss = ieee80211_sta_active_ibss(sdata);
1437 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1438
1439 if (active_ibss)
1440 return;
1441
1442 if (ifibss->fixed_bssid)
1443 bssid = ifibss->bssid;
1444 if (ifibss->fixed_channel)
1445 chan = ifibss->chandef.chan;
1446 if (!is_zero_ether_addr(ifibss->bssid))
1447 bssid = ifibss->bssid;
1448 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1449 ifibss->ssid, ifibss->ssid_len,
1450 IEEE80211_BSS_TYPE_IBSS,
1451 IEEE80211_PRIVACY(ifibss->privacy));
1452
1453 if (cbss) {
1454 struct ieee80211_bss *bss;
1455
1456 bss = (void *)cbss->priv;
1457 ibss_dbg(sdata,
1458 "sta_find_ibss: selected %pM current %pM\n",
1459 cbss->bssid, ifibss->bssid);
1460 sdata_info(sdata,
1461 "Selected IBSS BSSID %pM based on configured SSID\n",
1462 cbss->bssid);
1463
1464 ieee80211_sta_join_ibss(sdata, bss);
1465 ieee80211_rx_bss_put(local, bss);
1466 return;
1467 }
1468
1469 /* if a fixed bssid and a fixed freq have been provided create the IBSS
1470 * directly and do not waste time scanning
1471 */
1472 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1473 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1474 bssid);
1475 ieee80211_sta_create_ibss(sdata);
1476 return;
1477 }
1478
1479
1480 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1481
1482 /* Selected IBSS not found in current scan results - try to scan */
1483 if (time_after(jiffies, ifibss->last_scan_completed +
1484 IEEE80211_SCAN_INTERVAL)) {
1485 struct ieee80211_channel *channels[8];
1486 unsigned int num;
1487
1488 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1489
1490 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1491
1492 if (ifibss->fixed_channel) {
1493 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1494 &ifibss->chandef,
1495 channels,
1496 ARRAY_SIZE(channels));
1497 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1498 ifibss->ssid_len, channels,
1499 num, scan_width);
1500 } else {
1501 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1502 ifibss->ssid_len, NULL,
1503 0, scan_width);
1504 }
1505 } else {
1506 int interval = IEEE80211_SCAN_INTERVAL;
1507
1508 if (time_after(jiffies, ifibss->ibss_join_req +
1509 IEEE80211_IBSS_JOIN_TIMEOUT))
1510 ieee80211_sta_create_ibss(sdata);
1511
1512 mod_timer(&ifibss->timer,
1513 round_jiffies(jiffies + interval));
1514 }
1515 }
1516
1517 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1518 struct sk_buff *req)
1519 {
1520 struct ieee80211_mgmt *mgmt = (void *)req->data;
1521 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1522 struct ieee80211_local *local = sdata->local;
1523 int tx_last_beacon, len = req->len;
1524 struct sk_buff *skb;
1525 struct beacon_data *presp;
1526 u8 *pos, *end;
1527
1528 sdata_assert_lock(sdata);
1529
1530 presp = rcu_dereference_protected(ifibss->presp,
1531 lockdep_is_held(&sdata->wdev.mtx));
1532
1533 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1534 len < 24 + 2 || !presp)
1535 return;
1536
1537 tx_last_beacon = drv_tx_last_beacon(local);
1538
1539 ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
1540 ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n",
1541 mgmt->bssid, tx_last_beacon);
1542
1543 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1544 return;
1545
1546 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1547 !is_broadcast_ether_addr(mgmt->bssid))
1548 return;
1549
1550 end = ((u8 *) mgmt) + len;
1551 pos = mgmt->u.probe_req.variable;
1552 if (pos[0] != WLAN_EID_SSID ||
1553 pos + 2 + pos[1] > end) {
1554 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1555 mgmt->sa);
1556 return;
1557 }
1558 if (pos[1] != 0 &&
1559 (pos[1] != ifibss->ssid_len ||
1560 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1561 /* Ignore ProbeReq for foreign SSID */
1562 return;
1563 }
1564
1565 /* Reply with ProbeResp */
1566 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1567 if (!skb)
1568 return;
1569
1570 skb_reserve(skb, local->tx_headroom);
1571 skb_put_data(skb, presp->head, presp->head_len);
1572
1573 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1574 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1575 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1576
1577 /* avoid excessive retries for probe request to wildcard SSIDs */
1578 if (pos[1] == 0)
1579 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1580
1581 ieee80211_tx_skb(sdata, skb);
1582 }
1583
1584 static
1585 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1586 struct ieee80211_mgmt *mgmt, size_t len,
1587 struct ieee80211_rx_status *rx_status)
1588 {
1589 size_t baselen;
1590 struct ieee802_11_elems elems;
1591
1592 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1593 offsetof(typeof(mgmt->u.beacon), variable));
1594
1595 /*
1596 * either beacon or probe_resp but the variable field is at the
1597 * same offset
1598 */
1599 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1600 if (baselen > len)
1601 return;
1602
1603 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1604 false, &elems, mgmt->bssid, NULL);
1605
1606 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1607 }
1608
1609 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1610 struct sk_buff *skb)
1611 {
1612 struct ieee80211_rx_status *rx_status;
1613 struct ieee80211_mgmt *mgmt;
1614 u16 fc;
1615 struct ieee802_11_elems elems;
1616 int ies_len;
1617
1618 rx_status = IEEE80211_SKB_RXCB(skb);
1619 mgmt = (struct ieee80211_mgmt *) skb->data;
1620 fc = le16_to_cpu(mgmt->frame_control);
1621
1622 sdata_lock(sdata);
1623
1624 if (!sdata->u.ibss.ssid_len)
1625 goto mgmt_out; /* not ready to merge yet */
1626
1627 switch (fc & IEEE80211_FCTL_STYPE) {
1628 case IEEE80211_STYPE_PROBE_REQ:
1629 ieee80211_rx_mgmt_probe_req(sdata, skb);
1630 break;
1631 case IEEE80211_STYPE_PROBE_RESP:
1632 case IEEE80211_STYPE_BEACON:
1633 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1634 rx_status);
1635 break;
1636 case IEEE80211_STYPE_AUTH:
1637 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1638 break;
1639 case IEEE80211_STYPE_DEAUTH:
1640 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1641 break;
1642 case IEEE80211_STYPE_ACTION:
1643 switch (mgmt->u.action.category) {
1644 case WLAN_CATEGORY_SPECTRUM_MGMT:
1645 ies_len = skb->len -
1646 offsetof(struct ieee80211_mgmt,
1647 u.action.u.chan_switch.variable);
1648
1649 if (ies_len < 0)
1650 break;
1651
1652 ieee802_11_parse_elems(
1653 mgmt->u.action.u.chan_switch.variable,
1654 ies_len, true, &elems, mgmt->bssid, NULL);
1655
1656 if (elems.parse_error)
1657 break;
1658
1659 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1660 rx_status, &elems);
1661 break;
1662 }
1663 }
1664
1665 mgmt_out:
1666 sdata_unlock(sdata);
1667 }
1668
1669 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1670 {
1671 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1672 struct sta_info *sta;
1673
1674 sdata_lock(sdata);
1675
1676 /*
1677 * Work could be scheduled after scan or similar
1678 * when we aren't even joined (or trying) with a
1679 * network.
1680 */
1681 if (!ifibss->ssid_len)
1682 goto out;
1683
1684 spin_lock_bh(&ifibss->incomplete_lock);
1685 while (!list_empty(&ifibss->incomplete_stations)) {
1686 sta = list_first_entry(&ifibss->incomplete_stations,
1687 struct sta_info, list);
1688 list_del(&sta->list);
1689 spin_unlock_bh(&ifibss->incomplete_lock);
1690
1691 ieee80211_ibss_finish_sta(sta);
1692 rcu_read_unlock();
1693 spin_lock_bh(&ifibss->incomplete_lock);
1694 }
1695 spin_unlock_bh(&ifibss->incomplete_lock);
1696
1697 switch (ifibss->state) {
1698 case IEEE80211_IBSS_MLME_SEARCH:
1699 ieee80211_sta_find_ibss(sdata);
1700 break;
1701 case IEEE80211_IBSS_MLME_JOINED:
1702 ieee80211_sta_merge_ibss(sdata);
1703 break;
1704 default:
1705 WARN_ON(1);
1706 break;
1707 }
1708
1709 out:
1710 sdata_unlock(sdata);
1711 }
1712
1713 static void ieee80211_ibss_timer(struct timer_list *t)
1714 {
1715 struct ieee80211_sub_if_data *sdata =
1716 from_timer(sdata, t, u.ibss.timer);
1717
1718 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1719 }
1720
1721 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1722 {
1723 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1724
1725 timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0);
1726 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1727 spin_lock_init(&ifibss->incomplete_lock);
1728 INIT_WORK(&ifibss->csa_connection_drop_work,
1729 ieee80211_csa_connection_drop_work);
1730 }
1731
1732 /* scan finished notification */
1733 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1734 {
1735 struct ieee80211_sub_if_data *sdata;
1736
1737 mutex_lock(&local->iflist_mtx);
1738 list_for_each_entry(sdata, &local->interfaces, list) {
1739 if (!ieee80211_sdata_running(sdata))
1740 continue;
1741 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1742 continue;
1743 sdata->u.ibss.last_scan_completed = jiffies;
1744 }
1745 mutex_unlock(&local->iflist_mtx);
1746 }
1747
1748 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1749 struct cfg80211_ibss_params *params)
1750 {
1751 u32 changed = 0;
1752 u32 rate_flags;
1753 struct ieee80211_supported_band *sband;
1754 enum ieee80211_chanctx_mode chanmode;
1755 struct ieee80211_local *local = sdata->local;
1756 int radar_detect_width = 0;
1757 int i;
1758 int ret;
1759
1760 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1761 &params->chandef,
1762 sdata->wdev.iftype);
1763 if (ret < 0)
1764 return ret;
1765
1766 if (ret > 0) {
1767 if (!params->userspace_handles_dfs)
1768 return -EINVAL;
1769 radar_detect_width = BIT(params->chandef.width);
1770 }
1771
1772 chanmode = (params->channel_fixed && !ret) ?
1773 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1774
1775 mutex_lock(&local->chanctx_mtx);
1776 ret = ieee80211_check_combinations(sdata, &params->chandef, chanmode,
1777 radar_detect_width);
1778 mutex_unlock(&local->chanctx_mtx);
1779 if (ret < 0)
1780 return ret;
1781
1782 if (params->bssid) {
1783 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1784 sdata->u.ibss.fixed_bssid = true;
1785 } else
1786 sdata->u.ibss.fixed_bssid = false;
1787
1788 sdata->u.ibss.privacy = params->privacy;
1789 sdata->u.ibss.control_port = params->control_port;
1790 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1791 sdata->u.ibss.basic_rates = params->basic_rates;
1792 sdata->u.ibss.last_scan_completed = jiffies;
1793
1794 /* fix basic_rates if channel does not support these rates */
1795 rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
1796 sband = local->hw.wiphy->bands[params->chandef.chan->band];
1797 for (i = 0; i < sband->n_bitrates; i++) {
1798 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1799 sdata->u.ibss.basic_rates &= ~BIT(i);
1800 }
1801 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1802 sizeof(params->mcast_rate));
1803
1804 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1805
1806 sdata->u.ibss.chandef = params->chandef;
1807 sdata->u.ibss.fixed_channel = params->channel_fixed;
1808
1809 if (params->ie) {
1810 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1811 GFP_KERNEL);
1812 if (sdata->u.ibss.ie)
1813 sdata->u.ibss.ie_len = params->ie_len;
1814 }
1815
1816 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1817 sdata->u.ibss.ibss_join_req = jiffies;
1818
1819 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1820 sdata->u.ibss.ssid_len = params->ssid_len;
1821
1822 memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1823 sizeof(sdata->u.ibss.ht_capa));
1824 memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1825 sizeof(sdata->u.ibss.ht_capa_mask));
1826
1827 /*
1828 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1829 * reserved, but an HT STA shall protect HT transmissions as though
1830 * the HT Protection field were set to non-HT mixed mode.
1831 *
1832 * In an IBSS, the RIFS Mode field of the HT Operation element is
1833 * also reserved, but an HT STA shall operate as though this field
1834 * were set to 1.
1835 */
1836
1837 sdata->vif.bss_conf.ht_operation_mode |=
1838 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1839 | IEEE80211_HT_PARAM_RIFS_MODE;
1840
1841 changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE;
1842 ieee80211_bss_info_change_notify(sdata, changed);
1843
1844 sdata->smps_mode = IEEE80211_SMPS_OFF;
1845 sdata->needed_rx_chains = local->rx_chains;
1846 sdata->control_port_over_nl80211 = params->control_port_over_nl80211;
1847
1848 ieee80211_queue_work(&local->hw, &sdata->work);
1849
1850 return 0;
1851 }
1852
1853 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1854 {
1855 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1856
1857 ieee80211_ibss_disconnect(sdata);
1858 ifibss->ssid_len = 0;
1859 eth_zero_addr(ifibss->bssid);
1860
1861 /* remove beacon */
1862 kfree(sdata->u.ibss.ie);
1863
1864 /* on the next join, re-program HT parameters */
1865 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1866 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1867
1868 synchronize_rcu();
1869
1870 skb_queue_purge(&sdata->skb_queue);
1871
1872 del_timer_sync(&sdata->u.ibss.timer);
1873
1874 return 0;
1875 }
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