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[thirdparty/kernel/linux.git] / net / mac80211 / ibss.c
1 /*
2 * IBSS mode implementation
3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 * Copyright 2009, Johannes Berg <johannes@sipsolutions.net>
9 * Copyright 2013-2014 Intel Mobile Communications GmbH
10 * Copyright(c) 2016 Intel Deutschland GmbH
11 * Copyright(c) 2018-2019 Intel Corporation
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
16 */
17
18 #include <linux/delay.h>
19 #include <linux/slab.h>
20 #include <linux/if_ether.h>
21 #include <linux/skbuff.h>
22 #include <linux/if_arp.h>
23 #include <linux/etherdevice.h>
24 #include <linux/rtnetlink.h>
25 #include <net/mac80211.h>
26
27 #include "ieee80211_i.h"
28 #include "driver-ops.h"
29 #include "rate.h"
30
31 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
32 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
33
34 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
35 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
36 #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ)
37
38 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
39
40 static struct beacon_data *
41 ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata,
42 const int beacon_int, const u32 basic_rates,
43 const u16 capability, u64 tsf,
44 struct cfg80211_chan_def *chandef,
45 bool *have_higher_than_11mbit,
46 struct cfg80211_csa_settings *csa_settings)
47 {
48 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
49 struct ieee80211_local *local = sdata->local;
50 int rates_n = 0, i, ri;
51 struct ieee80211_mgmt *mgmt;
52 u8 *pos;
53 struct ieee80211_supported_band *sband;
54 u32 rate_flags, rates = 0, rates_added = 0;
55 struct beacon_data *presp;
56 int frame_len;
57 int shift;
58
59 /* Build IBSS probe response */
60 frame_len = sizeof(struct ieee80211_hdr_3addr) +
61 12 /* struct ieee80211_mgmt.u.beacon */ +
62 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
63 2 + 8 /* max Supported Rates */ +
64 3 /* max DS params */ +
65 4 /* IBSS params */ +
66 5 /* Channel Switch Announcement */ +
67 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
68 2 + sizeof(struct ieee80211_ht_cap) +
69 2 + sizeof(struct ieee80211_ht_operation) +
70 2 + sizeof(struct ieee80211_vht_cap) +
71 2 + sizeof(struct ieee80211_vht_operation) +
72 ifibss->ie_len;
73 presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
74 if (!presp)
75 return NULL;
76
77 presp->head = (void *)(presp + 1);
78
79 mgmt = (void *) presp->head;
80 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
81 IEEE80211_STYPE_PROBE_RESP);
82 eth_broadcast_addr(mgmt->da);
83 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
84 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
85 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
86 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
87 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
88
89 pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
90
91 *pos++ = WLAN_EID_SSID;
92 *pos++ = ifibss->ssid_len;
93 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
94 pos += ifibss->ssid_len;
95
96 sband = local->hw.wiphy->bands[chandef->chan->band];
97 rate_flags = ieee80211_chandef_rate_flags(chandef);
98 shift = ieee80211_chandef_get_shift(chandef);
99 rates_n = 0;
100 if (have_higher_than_11mbit)
101 *have_higher_than_11mbit = false;
102
103 for (i = 0; i < sband->n_bitrates; i++) {
104 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
105 continue;
106 if (sband->bitrates[i].bitrate > 110 &&
107 have_higher_than_11mbit)
108 *have_higher_than_11mbit = true;
109
110 rates |= BIT(i);
111 rates_n++;
112 }
113
114 *pos++ = WLAN_EID_SUPP_RATES;
115 *pos++ = min_t(int, 8, rates_n);
116 for (ri = 0; ri < sband->n_bitrates; ri++) {
117 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
118 5 * (1 << shift));
119 u8 basic = 0;
120 if (!(rates & BIT(ri)))
121 continue;
122
123 if (basic_rates & BIT(ri))
124 basic = 0x80;
125 *pos++ = basic | (u8) rate;
126 if (++rates_added == 8) {
127 ri++; /* continue at next rate for EXT_SUPP_RATES */
128 break;
129 }
130 }
131
132 if (sband->band == NL80211_BAND_2GHZ) {
133 *pos++ = WLAN_EID_DS_PARAMS;
134 *pos++ = 1;
135 *pos++ = ieee80211_frequency_to_channel(
136 chandef->chan->center_freq);
137 }
138
139 *pos++ = WLAN_EID_IBSS_PARAMS;
140 *pos++ = 2;
141 /* FIX: set ATIM window based on scan results */
142 *pos++ = 0;
143 *pos++ = 0;
144
145 if (csa_settings) {
146 *pos++ = WLAN_EID_CHANNEL_SWITCH;
147 *pos++ = 3;
148 *pos++ = csa_settings->block_tx ? 1 : 0;
149 *pos++ = ieee80211_frequency_to_channel(
150 csa_settings->chandef.chan->center_freq);
151 presp->csa_counter_offsets[0] = (pos - presp->head);
152 *pos++ = csa_settings->count;
153 presp->csa_current_counter = csa_settings->count;
154 }
155
156 /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
157 if (rates_n > 8) {
158 *pos++ = WLAN_EID_EXT_SUPP_RATES;
159 *pos++ = rates_n - 8;
160 for (; ri < sband->n_bitrates; ri++) {
161 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
162 5 * (1 << shift));
163 u8 basic = 0;
164 if (!(rates & BIT(ri)))
165 continue;
166
167 if (basic_rates & BIT(ri))
168 basic = 0x80;
169 *pos++ = basic | (u8) rate;
170 }
171 }
172
173 if (ifibss->ie_len) {
174 memcpy(pos, ifibss->ie, ifibss->ie_len);
175 pos += ifibss->ie_len;
176 }
177
178 /* add HT capability and information IEs */
179 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
180 chandef->width != NL80211_CHAN_WIDTH_5 &&
181 chandef->width != NL80211_CHAN_WIDTH_10 &&
182 sband->ht_cap.ht_supported) {
183 struct ieee80211_sta_ht_cap ht_cap;
184
185 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
186 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
187
188 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
189 /*
190 * Note: According to 802.11n-2009 9.13.3.1, HT Protection
191 * field and RIFS Mode are reserved in IBSS mode, therefore
192 * keep them at 0
193 */
194 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
195 chandef, 0, false);
196
197 /* add VHT capability and information IEs */
198 if (chandef->width != NL80211_CHAN_WIDTH_20 &&
199 chandef->width != NL80211_CHAN_WIDTH_40 &&
200 sband->vht_cap.vht_supported) {
201 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
202 sband->vht_cap.cap);
203 pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap,
204 chandef);
205 }
206 }
207
208 if (local->hw.queues >= IEEE80211_NUM_ACS)
209 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */
210
211 presp->head_len = pos - presp->head;
212 if (WARN_ON(presp->head_len > frame_len))
213 goto error;
214
215 return presp;
216 error:
217 kfree(presp);
218 return NULL;
219 }
220
221 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
222 const u8 *bssid, const int beacon_int,
223 struct cfg80211_chan_def *req_chandef,
224 const u32 basic_rates,
225 const u16 capability, u64 tsf,
226 bool creator)
227 {
228 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
229 struct ieee80211_local *local = sdata->local;
230 struct ieee80211_mgmt *mgmt;
231 struct cfg80211_bss *bss;
232 u32 bss_change;
233 struct cfg80211_chan_def chandef;
234 struct ieee80211_channel *chan;
235 struct beacon_data *presp;
236 struct cfg80211_inform_bss bss_meta = {};
237 bool have_higher_than_11mbit;
238 bool radar_required;
239 int err;
240
241 sdata_assert_lock(sdata);
242
243 /* Reset own TSF to allow time synchronization work. */
244 drv_reset_tsf(local, sdata);
245
246 if (!ether_addr_equal(ifibss->bssid, bssid))
247 sta_info_flush(sdata);
248
249 /* if merging, indicate to driver that we leave the old IBSS */
250 if (sdata->vif.bss_conf.ibss_joined) {
251 sdata->vif.bss_conf.ibss_joined = false;
252 sdata->vif.bss_conf.ibss_creator = false;
253 sdata->vif.bss_conf.enable_beacon = false;
254 netif_carrier_off(sdata->dev);
255 ieee80211_bss_info_change_notify(sdata,
256 BSS_CHANGED_IBSS |
257 BSS_CHANGED_BEACON_ENABLED);
258 drv_leave_ibss(local, sdata);
259 }
260
261 presp = rcu_dereference_protected(ifibss->presp,
262 lockdep_is_held(&sdata->wdev.mtx));
263 RCU_INIT_POINTER(ifibss->presp, NULL);
264 if (presp)
265 kfree_rcu(presp, rcu_head);
266
267 /* make a copy of the chandef, it could be modified below. */
268 chandef = *req_chandef;
269 chan = chandef.chan;
270 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
271 NL80211_IFTYPE_ADHOC)) {
272 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
273 chandef.width == NL80211_CHAN_WIDTH_10 ||
274 chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
275 chandef.width == NL80211_CHAN_WIDTH_20) {
276 sdata_info(sdata,
277 "Failed to join IBSS, beacons forbidden\n");
278 return;
279 }
280 chandef.width = NL80211_CHAN_WIDTH_20;
281 chandef.center_freq1 = chan->center_freq;
282 /* check again for downgraded chandef */
283 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
284 NL80211_IFTYPE_ADHOC)) {
285 sdata_info(sdata,
286 "Failed to join IBSS, beacons forbidden\n");
287 return;
288 }
289 }
290
291 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
292 &chandef, NL80211_IFTYPE_ADHOC);
293 if (err < 0) {
294 sdata_info(sdata,
295 "Failed to join IBSS, invalid chandef\n");
296 return;
297 }
298 if (err > 0 && !ifibss->userspace_handles_dfs) {
299 sdata_info(sdata,
300 "Failed to join IBSS, DFS channel without control program\n");
301 return;
302 }
303
304 radar_required = err;
305
306 mutex_lock(&local->mtx);
307 if (ieee80211_vif_use_channel(sdata, &chandef,
308 ifibss->fixed_channel ?
309 IEEE80211_CHANCTX_SHARED :
310 IEEE80211_CHANCTX_EXCLUSIVE)) {
311 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
312 mutex_unlock(&local->mtx);
313 return;
314 }
315 sdata->radar_required = radar_required;
316 mutex_unlock(&local->mtx);
317
318 memcpy(ifibss->bssid, bssid, ETH_ALEN);
319
320 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
321 capability, tsf, &chandef,
322 &have_higher_than_11mbit, NULL);
323 if (!presp)
324 return;
325
326 rcu_assign_pointer(ifibss->presp, presp);
327 mgmt = (void *)presp->head;
328
329 sdata->vif.bss_conf.enable_beacon = true;
330 sdata->vif.bss_conf.beacon_int = beacon_int;
331 sdata->vif.bss_conf.basic_rates = basic_rates;
332 sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
333 memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
334 bss_change = BSS_CHANGED_BEACON_INT;
335 bss_change |= ieee80211_reset_erp_info(sdata);
336 bss_change |= BSS_CHANGED_BSSID;
337 bss_change |= BSS_CHANGED_BEACON;
338 bss_change |= BSS_CHANGED_BEACON_ENABLED;
339 bss_change |= BSS_CHANGED_BASIC_RATES;
340 bss_change |= BSS_CHANGED_HT;
341 bss_change |= BSS_CHANGED_IBSS;
342 bss_change |= BSS_CHANGED_SSID;
343
344 /*
345 * In 5 GHz/802.11a, we can always use short slot time.
346 * (IEEE 802.11-2012 18.3.8.7)
347 *
348 * In 2.4GHz, we must always use long slots in IBSS for compatibility
349 * reasons.
350 * (IEEE 802.11-2012 19.4.5)
351 *
352 * HT follows these specifications (IEEE 802.11-2012 20.3.18)
353 */
354 sdata->vif.bss_conf.use_short_slot = chan->band == NL80211_BAND_5GHZ;
355 bss_change |= BSS_CHANGED_ERP_SLOT;
356
357 /* cf. IEEE 802.11 9.2.12 */
358 if (chan->band == NL80211_BAND_2GHZ && have_higher_than_11mbit)
359 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
360 else
361 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
362
363 ieee80211_set_wmm_default(sdata, true, false);
364
365 sdata->vif.bss_conf.ibss_joined = true;
366 sdata->vif.bss_conf.ibss_creator = creator;
367
368 err = drv_join_ibss(local, sdata);
369 if (err) {
370 sdata->vif.bss_conf.ibss_joined = false;
371 sdata->vif.bss_conf.ibss_creator = false;
372 sdata->vif.bss_conf.enable_beacon = false;
373 sdata->vif.bss_conf.ssid_len = 0;
374 RCU_INIT_POINTER(ifibss->presp, NULL);
375 kfree_rcu(presp, rcu_head);
376 mutex_lock(&local->mtx);
377 ieee80211_vif_release_channel(sdata);
378 mutex_unlock(&local->mtx);
379 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
380 err);
381 return;
382 }
383
384 ieee80211_bss_info_change_notify(sdata, bss_change);
385
386 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
387 mod_timer(&ifibss->timer,
388 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
389
390 bss_meta.chan = chan;
391 bss_meta.scan_width = cfg80211_chandef_to_scan_width(&chandef);
392 bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt,
393 presp->head_len, GFP_KERNEL);
394
395 cfg80211_put_bss(local->hw.wiphy, bss);
396 netif_carrier_on(sdata->dev);
397 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
398 }
399
400 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
401 struct ieee80211_bss *bss)
402 {
403 struct cfg80211_bss *cbss =
404 container_of((void *)bss, struct cfg80211_bss, priv);
405 struct ieee80211_supported_band *sband;
406 struct cfg80211_chan_def chandef;
407 u32 basic_rates;
408 int i, j;
409 u16 beacon_int = cbss->beacon_interval;
410 const struct cfg80211_bss_ies *ies;
411 enum nl80211_channel_type chan_type;
412 u64 tsf;
413 u32 rate_flags;
414 int shift;
415
416 sdata_assert_lock(sdata);
417
418 if (beacon_int < 10)
419 beacon_int = 10;
420
421 switch (sdata->u.ibss.chandef.width) {
422 case NL80211_CHAN_WIDTH_20_NOHT:
423 case NL80211_CHAN_WIDTH_20:
424 case NL80211_CHAN_WIDTH_40:
425 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
426 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
427 break;
428 case NL80211_CHAN_WIDTH_5:
429 case NL80211_CHAN_WIDTH_10:
430 cfg80211_chandef_create(&chandef, cbss->channel,
431 NL80211_CHAN_NO_HT);
432 chandef.width = sdata->u.ibss.chandef.width;
433 break;
434 case NL80211_CHAN_WIDTH_80:
435 case NL80211_CHAN_WIDTH_80P80:
436 case NL80211_CHAN_WIDTH_160:
437 chandef = sdata->u.ibss.chandef;
438 chandef.chan = cbss->channel;
439 break;
440 default:
441 /* fall back to 20 MHz for unsupported modes */
442 cfg80211_chandef_create(&chandef, cbss->channel,
443 NL80211_CHAN_NO_HT);
444 break;
445 }
446
447 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
448 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
449 shift = ieee80211_vif_get_shift(&sdata->vif);
450
451 basic_rates = 0;
452
453 for (i = 0; i < bss->supp_rates_len; i++) {
454 int rate = bss->supp_rates[i] & 0x7f;
455 bool is_basic = !!(bss->supp_rates[i] & 0x80);
456
457 for (j = 0; j < sband->n_bitrates; j++) {
458 int brate;
459 if ((rate_flags & sband->bitrates[j].flags)
460 != rate_flags)
461 continue;
462
463 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
464 5 * (1 << shift));
465 if (brate == rate) {
466 if (is_basic)
467 basic_rates |= BIT(j);
468 break;
469 }
470 }
471 }
472
473 rcu_read_lock();
474 ies = rcu_dereference(cbss->ies);
475 tsf = ies->tsf;
476 rcu_read_unlock();
477
478 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
479 beacon_int,
480 &chandef,
481 basic_rates,
482 cbss->capability,
483 tsf, false);
484 }
485
486 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
487 struct cfg80211_csa_settings *csa_settings)
488 {
489 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
490 struct beacon_data *presp, *old_presp;
491 struct cfg80211_bss *cbss;
492 const struct cfg80211_bss_ies *ies;
493 u16 capability = WLAN_CAPABILITY_IBSS;
494 u64 tsf;
495 int ret = 0;
496
497 sdata_assert_lock(sdata);
498
499 if (ifibss->privacy)
500 capability |= WLAN_CAPABILITY_PRIVACY;
501
502 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
503 ifibss->bssid, ifibss->ssid,
504 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS,
505 IEEE80211_PRIVACY(ifibss->privacy));
506
507 if (WARN_ON(!cbss)) {
508 ret = -EINVAL;
509 goto out;
510 }
511
512 rcu_read_lock();
513 ies = rcu_dereference(cbss->ies);
514 tsf = ies->tsf;
515 rcu_read_unlock();
516 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
517
518 old_presp = rcu_dereference_protected(ifibss->presp,
519 lockdep_is_held(&sdata->wdev.mtx));
520
521 presp = ieee80211_ibss_build_presp(sdata,
522 sdata->vif.bss_conf.beacon_int,
523 sdata->vif.bss_conf.basic_rates,
524 capability, tsf, &ifibss->chandef,
525 NULL, csa_settings);
526 if (!presp) {
527 ret = -ENOMEM;
528 goto out;
529 }
530
531 rcu_assign_pointer(ifibss->presp, presp);
532 if (old_presp)
533 kfree_rcu(old_presp, rcu_head);
534
535 return BSS_CHANGED_BEACON;
536 out:
537 return ret;
538 }
539
540 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
541 {
542 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
543 struct cfg80211_bss *cbss;
544 int err, changed = 0;
545
546 sdata_assert_lock(sdata);
547
548 /* update cfg80211 bss information with the new channel */
549 if (!is_zero_ether_addr(ifibss->bssid)) {
550 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
551 ifibss->chandef.chan,
552 ifibss->bssid, ifibss->ssid,
553 ifibss->ssid_len,
554 IEEE80211_BSS_TYPE_IBSS,
555 IEEE80211_PRIVACY(ifibss->privacy));
556 /* XXX: should not really modify cfg80211 data */
557 if (cbss) {
558 cbss->channel = sdata->csa_chandef.chan;
559 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
560 }
561 }
562
563 ifibss->chandef = sdata->csa_chandef;
564
565 /* generate the beacon */
566 err = ieee80211_ibss_csa_beacon(sdata, NULL);
567 if (err < 0)
568 return err;
569
570 changed |= err;
571
572 return changed;
573 }
574
575 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
576 {
577 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
578
579 cancel_work_sync(&ifibss->csa_connection_drop_work);
580 }
581
582 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
583 __acquires(RCU)
584 {
585 struct ieee80211_sub_if_data *sdata = sta->sdata;
586 u8 addr[ETH_ALEN];
587
588 memcpy(addr, sta->sta.addr, ETH_ALEN);
589
590 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
591
592 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
593 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
594 /* authorize the station only if the network is not RSN protected. If
595 * not wait for the userspace to authorize it */
596 if (!sta->sdata->u.ibss.control_port)
597 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
598
599 rate_control_rate_init(sta);
600
601 /* If it fails, maybe we raced another insertion? */
602 if (sta_info_insert_rcu(sta))
603 return sta_info_get(sdata, addr);
604 return sta;
605 }
606
607 static struct sta_info *
608 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
609 const u8 *addr, u32 supp_rates)
610 __acquires(RCU)
611 {
612 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
613 struct ieee80211_local *local = sdata->local;
614 struct sta_info *sta;
615 struct ieee80211_chanctx_conf *chanctx_conf;
616 struct ieee80211_supported_band *sband;
617 enum nl80211_bss_scan_width scan_width;
618 int band;
619
620 /*
621 * XXX: Consider removing the least recently used entry and
622 * allow new one to be added.
623 */
624 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
625 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
626 sdata->name, addr);
627 rcu_read_lock();
628 return NULL;
629 }
630
631 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
632 rcu_read_lock();
633 return NULL;
634 }
635
636 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
637 rcu_read_lock();
638 return NULL;
639 }
640
641 rcu_read_lock();
642 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
643 if (WARN_ON_ONCE(!chanctx_conf))
644 return NULL;
645 band = chanctx_conf->def.chan->band;
646 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
647 rcu_read_unlock();
648
649 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
650 if (!sta) {
651 rcu_read_lock();
652 return NULL;
653 }
654
655 /* make sure mandatory rates are always added */
656 sband = local->hw.wiphy->bands[band];
657 sta->sta.supp_rates[band] = supp_rates |
658 ieee80211_mandatory_rates(sband, scan_width);
659
660 return ieee80211_ibss_finish_sta(sta);
661 }
662
663 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
664 {
665 struct ieee80211_local *local = sdata->local;
666 int active = 0;
667 struct sta_info *sta;
668
669 sdata_assert_lock(sdata);
670
671 rcu_read_lock();
672
673 list_for_each_entry_rcu(sta, &local->sta_list, list) {
674 unsigned long last_active = ieee80211_sta_last_active(sta);
675
676 if (sta->sdata == sdata &&
677 time_is_after_jiffies(last_active +
678 IEEE80211_IBSS_MERGE_INTERVAL)) {
679 active++;
680 break;
681 }
682 }
683
684 rcu_read_unlock();
685
686 return active;
687 }
688
689 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
690 {
691 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
692 struct ieee80211_local *local = sdata->local;
693 struct cfg80211_bss *cbss;
694 struct beacon_data *presp;
695 struct sta_info *sta;
696
697 if (!is_zero_ether_addr(ifibss->bssid)) {
698 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
699 ifibss->bssid, ifibss->ssid,
700 ifibss->ssid_len,
701 IEEE80211_BSS_TYPE_IBSS,
702 IEEE80211_PRIVACY(ifibss->privacy));
703
704 if (cbss) {
705 cfg80211_unlink_bss(local->hw.wiphy, cbss);
706 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
707 }
708 }
709
710 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
711
712 sta_info_flush(sdata);
713
714 spin_lock_bh(&ifibss->incomplete_lock);
715 while (!list_empty(&ifibss->incomplete_stations)) {
716 sta = list_first_entry(&ifibss->incomplete_stations,
717 struct sta_info, list);
718 list_del(&sta->list);
719 spin_unlock_bh(&ifibss->incomplete_lock);
720
721 sta_info_free(local, sta);
722 spin_lock_bh(&ifibss->incomplete_lock);
723 }
724 spin_unlock_bh(&ifibss->incomplete_lock);
725
726 netif_carrier_off(sdata->dev);
727
728 sdata->vif.bss_conf.ibss_joined = false;
729 sdata->vif.bss_conf.ibss_creator = false;
730 sdata->vif.bss_conf.enable_beacon = false;
731 sdata->vif.bss_conf.ssid_len = 0;
732
733 /* remove beacon */
734 presp = rcu_dereference_protected(ifibss->presp,
735 lockdep_is_held(&sdata->wdev.mtx));
736 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
737 if (presp)
738 kfree_rcu(presp, rcu_head);
739
740 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
741 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
742 BSS_CHANGED_IBSS);
743 drv_leave_ibss(local, sdata);
744 mutex_lock(&local->mtx);
745 ieee80211_vif_release_channel(sdata);
746 mutex_unlock(&local->mtx);
747 }
748
749 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
750 {
751 struct ieee80211_sub_if_data *sdata =
752 container_of(work, struct ieee80211_sub_if_data,
753 u.ibss.csa_connection_drop_work);
754
755 sdata_lock(sdata);
756
757 ieee80211_ibss_disconnect(sdata);
758 synchronize_rcu();
759 skb_queue_purge(&sdata->skb_queue);
760
761 /* trigger a scan to find another IBSS network to join */
762 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
763
764 sdata_unlock(sdata);
765 }
766
767 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
768 {
769 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
770 int err;
771
772 /* if the current channel is a DFS channel, mark the channel as
773 * unavailable.
774 */
775 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
776 &ifibss->chandef,
777 NL80211_IFTYPE_ADHOC);
778 if (err > 0)
779 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
780 GFP_ATOMIC);
781 }
782
783 static bool
784 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
785 struct ieee802_11_elems *elems,
786 bool beacon)
787 {
788 struct cfg80211_csa_settings params;
789 struct ieee80211_csa_ie csa_ie;
790 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
791 enum nl80211_channel_type ch_type;
792 int err;
793 u32 sta_flags;
794
795 sdata_assert_lock(sdata);
796
797 sta_flags = IEEE80211_STA_DISABLE_VHT;
798 switch (ifibss->chandef.width) {
799 case NL80211_CHAN_WIDTH_5:
800 case NL80211_CHAN_WIDTH_10:
801 case NL80211_CHAN_WIDTH_20_NOHT:
802 sta_flags |= IEEE80211_STA_DISABLE_HT;
803 /* fall through */
804 case NL80211_CHAN_WIDTH_20:
805 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
806 break;
807 default:
808 break;
809 }
810
811 memset(&params, 0, sizeof(params));
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\n", mgmt->sa, mgmt->da);
952 ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", 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, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
971 ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n",
972 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(&local->hw,
1075 elems->vht_operation,
1076 elems->ht_operation,
1077 &chandef);
1078 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1079 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1080 &cap_ie, sta);
1081 if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap)))
1082 rates_updated |= true;
1083 }
1084
1085 if (bw != sta->sta.bandwidth)
1086 rates_updated |= true;
1087
1088 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1089 &chandef))
1090 WARN_ON_ONCE(1);
1091 }
1092
1093 if (sta && rates_updated) {
1094 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1095 u8 rx_nss = sta->sta.rx_nss;
1096
1097 /* Force rx_nss recalculation */
1098 sta->sta.rx_nss = 0;
1099 rate_control_rate_init(sta);
1100 if (sta->sta.rx_nss != rx_nss)
1101 changed |= IEEE80211_RC_NSS_CHANGED;
1102
1103 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1104 }
1105
1106 rcu_read_unlock();
1107 }
1108
1109 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1110 struct ieee80211_mgmt *mgmt, size_t len,
1111 struct ieee80211_rx_status *rx_status,
1112 struct ieee802_11_elems *elems)
1113 {
1114 struct ieee80211_local *local = sdata->local;
1115 struct cfg80211_bss *cbss;
1116 struct ieee80211_bss *bss;
1117 struct ieee80211_channel *channel;
1118 u64 beacon_timestamp, rx_timestamp;
1119 u32 supp_rates = 0;
1120 enum nl80211_band band = rx_status->band;
1121
1122 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1123 if (!channel)
1124 return;
1125
1126 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1127
1128 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel);
1129 if (!bss)
1130 return;
1131
1132 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1133
1134 /* same for beacon and probe response */
1135 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1136
1137 /* check if we need to merge IBSS */
1138
1139 /* not an IBSS */
1140 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1141 goto put_bss;
1142
1143 /* different channel */
1144 if (sdata->u.ibss.fixed_channel &&
1145 sdata->u.ibss.chandef.chan != cbss->channel)
1146 goto put_bss;
1147
1148 /* different SSID */
1149 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1150 memcmp(elems->ssid, sdata->u.ibss.ssid,
1151 sdata->u.ibss.ssid_len))
1152 goto put_bss;
1153
1154 /* process channel switch */
1155 if (sdata->vif.csa_active ||
1156 ieee80211_ibss_process_chanswitch(sdata, elems, true))
1157 goto put_bss;
1158
1159 /* same BSSID */
1160 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1161 goto put_bss;
1162
1163 /* we use a fixed BSSID */
1164 if (sdata->u.ibss.fixed_bssid)
1165 goto put_bss;
1166
1167 if (ieee80211_have_rx_timestamp(rx_status)) {
1168 /* time when timestamp field was received */
1169 rx_timestamp =
1170 ieee80211_calculate_rx_timestamp(local, rx_status,
1171 len + FCS_LEN, 24);
1172 } else {
1173 /*
1174 * second best option: get current TSF
1175 * (will return -1 if not supported)
1176 */
1177 rx_timestamp = drv_get_tsf(local, sdata);
1178 }
1179
1180 ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n",
1181 mgmt->sa, mgmt->bssid,
1182 (unsigned long long)rx_timestamp);
1183 ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n",
1184 (unsigned long long)beacon_timestamp,
1185 (unsigned long long)(rx_timestamp - beacon_timestamp),
1186 jiffies);
1187
1188 if (beacon_timestamp > rx_timestamp) {
1189 ibss_dbg(sdata,
1190 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1191 mgmt->bssid);
1192 ieee80211_sta_join_ibss(sdata, bss);
1193 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1194 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1195 supp_rates);
1196 rcu_read_unlock();
1197 }
1198
1199 put_bss:
1200 ieee80211_rx_bss_put(local, bss);
1201 }
1202
1203 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1204 const u8 *bssid, const u8 *addr,
1205 u32 supp_rates)
1206 {
1207 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1208 struct ieee80211_local *local = sdata->local;
1209 struct sta_info *sta;
1210 struct ieee80211_chanctx_conf *chanctx_conf;
1211 struct ieee80211_supported_band *sband;
1212 enum nl80211_bss_scan_width scan_width;
1213 int band;
1214
1215 /*
1216 * XXX: Consider removing the least recently used entry and
1217 * allow new one to be added.
1218 */
1219 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1220 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1221 sdata->name, addr);
1222 return;
1223 }
1224
1225 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1226 return;
1227
1228 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1229 return;
1230
1231 rcu_read_lock();
1232 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1233 if (WARN_ON_ONCE(!chanctx_conf)) {
1234 rcu_read_unlock();
1235 return;
1236 }
1237 band = chanctx_conf->def.chan->band;
1238 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1239 rcu_read_unlock();
1240
1241 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1242 if (!sta)
1243 return;
1244
1245 /* make sure mandatory rates are always added */
1246 sband = local->hw.wiphy->bands[band];
1247 sta->sta.supp_rates[band] = supp_rates |
1248 ieee80211_mandatory_rates(sband, scan_width);
1249
1250 spin_lock(&ifibss->incomplete_lock);
1251 list_add(&sta->list, &ifibss->incomplete_stations);
1252 spin_unlock(&ifibss->incomplete_lock);
1253 ieee80211_queue_work(&local->hw, &sdata->work);
1254 }
1255
1256 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1257 {
1258 struct ieee80211_local *local = sdata->local;
1259 struct sta_info *sta, *tmp;
1260 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1261 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1262
1263 mutex_lock(&local->sta_mtx);
1264
1265 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1266 unsigned long last_active = ieee80211_sta_last_active(sta);
1267
1268 if (sdata != sta->sdata)
1269 continue;
1270
1271 if (time_is_before_jiffies(last_active + exp_time) ||
1272 (time_is_before_jiffies(last_active + exp_rsn) &&
1273 sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1274 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1275 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1276 "not authorized " : "", sta->sta.addr);
1277
1278 WARN_ON(__sta_info_destroy(sta));
1279 }
1280 }
1281
1282 mutex_unlock(&local->sta_mtx);
1283 }
1284
1285 /*
1286 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1287 */
1288
1289 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1290 {
1291 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1292 enum nl80211_bss_scan_width scan_width;
1293
1294 sdata_assert_lock(sdata);
1295
1296 mod_timer(&ifibss->timer,
1297 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1298
1299 ieee80211_ibss_sta_expire(sdata);
1300
1301 if (time_before(jiffies, ifibss->last_scan_completed +
1302 IEEE80211_IBSS_MERGE_INTERVAL))
1303 return;
1304
1305 if (ieee80211_sta_active_ibss(sdata))
1306 return;
1307
1308 if (ifibss->fixed_channel)
1309 return;
1310
1311 sdata_info(sdata,
1312 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1313
1314 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1315 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1316 NULL, 0, scan_width);
1317 }
1318
1319 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1320 {
1321 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1322 u8 bssid[ETH_ALEN];
1323 u16 capability;
1324 int i;
1325
1326 sdata_assert_lock(sdata);
1327
1328 if (ifibss->fixed_bssid) {
1329 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1330 } else {
1331 /* Generate random, not broadcast, locally administered BSSID. Mix in
1332 * own MAC address to make sure that devices that do not have proper
1333 * random number generator get different BSSID. */
1334 get_random_bytes(bssid, ETH_ALEN);
1335 for (i = 0; i < ETH_ALEN; i++)
1336 bssid[i] ^= sdata->vif.addr[i];
1337 bssid[0] &= ~0x01;
1338 bssid[0] |= 0x02;
1339 }
1340
1341 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1342
1343 capability = WLAN_CAPABILITY_IBSS;
1344
1345 if (ifibss->privacy)
1346 capability |= WLAN_CAPABILITY_PRIVACY;
1347
1348 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1349 &ifibss->chandef, ifibss->basic_rates,
1350 capability, 0, true);
1351 }
1352
1353 static unsigned ibss_setup_channels(struct wiphy *wiphy,
1354 struct ieee80211_channel **channels,
1355 unsigned int channels_max,
1356 u32 center_freq, u32 width)
1357 {
1358 struct ieee80211_channel *chan = NULL;
1359 unsigned int n_chan = 0;
1360 u32 start_freq, end_freq, freq;
1361
1362 if (width <= 20) {
1363 start_freq = center_freq;
1364 end_freq = center_freq;
1365 } else {
1366 start_freq = center_freq - width / 2 + 10;
1367 end_freq = center_freq + width / 2 - 10;
1368 }
1369
1370 for (freq = start_freq; freq <= end_freq; freq += 20) {
1371 chan = ieee80211_get_channel(wiphy, freq);
1372 if (!chan)
1373 continue;
1374 if (n_chan >= channels_max)
1375 return n_chan;
1376
1377 channels[n_chan] = chan;
1378 n_chan++;
1379 }
1380
1381 return n_chan;
1382 }
1383
1384 static unsigned int
1385 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1386 const struct cfg80211_chan_def *chandef,
1387 struct ieee80211_channel **channels,
1388 unsigned int channels_max)
1389 {
1390 unsigned int n_chan = 0;
1391 u32 width, cf1, cf2 = 0;
1392
1393 switch (chandef->width) {
1394 case NL80211_CHAN_WIDTH_40:
1395 width = 40;
1396 break;
1397 case NL80211_CHAN_WIDTH_80P80:
1398 cf2 = chandef->center_freq2;
1399 /* fall through */
1400 case NL80211_CHAN_WIDTH_80:
1401 width = 80;
1402 break;
1403 case NL80211_CHAN_WIDTH_160:
1404 width = 160;
1405 break;
1406 default:
1407 width = 20;
1408 break;
1409 }
1410
1411 cf1 = chandef->center_freq1;
1412
1413 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1414
1415 if (cf2)
1416 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1417 channels_max - n_chan, cf2,
1418 width);
1419
1420 return n_chan;
1421 }
1422
1423 /*
1424 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1425 */
1426
1427 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1428 {
1429 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1430 struct ieee80211_local *local = sdata->local;
1431 struct cfg80211_bss *cbss;
1432 struct ieee80211_channel *chan = NULL;
1433 const u8 *bssid = NULL;
1434 enum nl80211_bss_scan_width scan_width;
1435 int active_ibss;
1436
1437 sdata_assert_lock(sdata);
1438
1439 active_ibss = ieee80211_sta_active_ibss(sdata);
1440 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1441
1442 if (active_ibss)
1443 return;
1444
1445 if (ifibss->fixed_bssid)
1446 bssid = ifibss->bssid;
1447 if (ifibss->fixed_channel)
1448 chan = ifibss->chandef.chan;
1449 if (!is_zero_ether_addr(ifibss->bssid))
1450 bssid = ifibss->bssid;
1451 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1452 ifibss->ssid, ifibss->ssid_len,
1453 IEEE80211_BSS_TYPE_IBSS,
1454 IEEE80211_PRIVACY(ifibss->privacy));
1455
1456 if (cbss) {
1457 struct ieee80211_bss *bss;
1458
1459 bss = (void *)cbss->priv;
1460 ibss_dbg(sdata,
1461 "sta_find_ibss: selected %pM current %pM\n",
1462 cbss->bssid, ifibss->bssid);
1463 sdata_info(sdata,
1464 "Selected IBSS BSSID %pM based on configured SSID\n",
1465 cbss->bssid);
1466
1467 ieee80211_sta_join_ibss(sdata, bss);
1468 ieee80211_rx_bss_put(local, bss);
1469 return;
1470 }
1471
1472 /* if a fixed bssid and a fixed freq have been provided create the IBSS
1473 * directly and do not waste time scanning
1474 */
1475 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1476 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1477 bssid);
1478 ieee80211_sta_create_ibss(sdata);
1479 return;
1480 }
1481
1482
1483 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1484
1485 /* Selected IBSS not found in current scan results - try to scan */
1486 if (time_after(jiffies, ifibss->last_scan_completed +
1487 IEEE80211_SCAN_INTERVAL)) {
1488 struct ieee80211_channel *channels[8];
1489 unsigned int num;
1490
1491 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1492
1493 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1494
1495 if (ifibss->fixed_channel) {
1496 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1497 &ifibss->chandef,
1498 channels,
1499 ARRAY_SIZE(channels));
1500 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1501 ifibss->ssid_len, channels,
1502 num, scan_width);
1503 } else {
1504 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1505 ifibss->ssid_len, NULL,
1506 0, scan_width);
1507 }
1508 } else {
1509 int interval = IEEE80211_SCAN_INTERVAL;
1510
1511 if (time_after(jiffies, ifibss->ibss_join_req +
1512 IEEE80211_IBSS_JOIN_TIMEOUT))
1513 ieee80211_sta_create_ibss(sdata);
1514
1515 mod_timer(&ifibss->timer,
1516 round_jiffies(jiffies + interval));
1517 }
1518 }
1519
1520 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1521 struct sk_buff *req)
1522 {
1523 struct ieee80211_mgmt *mgmt = (void *)req->data;
1524 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1525 struct ieee80211_local *local = sdata->local;
1526 int tx_last_beacon, len = req->len;
1527 struct sk_buff *skb;
1528 struct beacon_data *presp;
1529 u8 *pos, *end;
1530
1531 sdata_assert_lock(sdata);
1532
1533 presp = rcu_dereference_protected(ifibss->presp,
1534 lockdep_is_held(&sdata->wdev.mtx));
1535
1536 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1537 len < 24 + 2 || !presp)
1538 return;
1539
1540 tx_last_beacon = drv_tx_last_beacon(local);
1541
1542 ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
1543 ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n",
1544 mgmt->bssid, tx_last_beacon);
1545
1546 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1547 return;
1548
1549 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1550 !is_broadcast_ether_addr(mgmt->bssid))
1551 return;
1552
1553 end = ((u8 *) mgmt) + len;
1554 pos = mgmt->u.probe_req.variable;
1555 if (pos[0] != WLAN_EID_SSID ||
1556 pos + 2 + pos[1] > end) {
1557 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1558 mgmt->sa);
1559 return;
1560 }
1561 if (pos[1] != 0 &&
1562 (pos[1] != ifibss->ssid_len ||
1563 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1564 /* Ignore ProbeReq for foreign SSID */
1565 return;
1566 }
1567
1568 /* Reply with ProbeResp */
1569 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1570 if (!skb)
1571 return;
1572
1573 skb_reserve(skb, local->tx_headroom);
1574 skb_put_data(skb, presp->head, presp->head_len);
1575
1576 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1577 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1578 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1579
1580 /* avoid excessive retries for probe request to wildcard SSIDs */
1581 if (pos[1] == 0)
1582 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1583
1584 ieee80211_tx_skb(sdata, skb);
1585 }
1586
1587 static
1588 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1589 struct ieee80211_mgmt *mgmt, size_t len,
1590 struct ieee80211_rx_status *rx_status)
1591 {
1592 size_t baselen;
1593 struct ieee802_11_elems elems;
1594
1595 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1596 offsetof(typeof(mgmt->u.beacon), variable));
1597
1598 /*
1599 * either beacon or probe_resp but the variable field is at the
1600 * same offset
1601 */
1602 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1603 if (baselen > len)
1604 return;
1605
1606 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1607 false, &elems, mgmt->bssid, NULL);
1608
1609 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1610 }
1611
1612 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1613 struct sk_buff *skb)
1614 {
1615 struct ieee80211_rx_status *rx_status;
1616 struct ieee80211_mgmt *mgmt;
1617 u16 fc;
1618 struct ieee802_11_elems elems;
1619 int ies_len;
1620
1621 rx_status = IEEE80211_SKB_RXCB(skb);
1622 mgmt = (struct ieee80211_mgmt *) skb->data;
1623 fc = le16_to_cpu(mgmt->frame_control);
1624
1625 sdata_lock(sdata);
1626
1627 if (!sdata->u.ibss.ssid_len)
1628 goto mgmt_out; /* not ready to merge yet */
1629
1630 switch (fc & IEEE80211_FCTL_STYPE) {
1631 case IEEE80211_STYPE_PROBE_REQ:
1632 ieee80211_rx_mgmt_probe_req(sdata, skb);
1633 break;
1634 case IEEE80211_STYPE_PROBE_RESP:
1635 case IEEE80211_STYPE_BEACON:
1636 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1637 rx_status);
1638 break;
1639 case IEEE80211_STYPE_AUTH:
1640 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1641 break;
1642 case IEEE80211_STYPE_DEAUTH:
1643 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1644 break;
1645 case IEEE80211_STYPE_ACTION:
1646 switch (mgmt->u.action.category) {
1647 case WLAN_CATEGORY_SPECTRUM_MGMT:
1648 ies_len = skb->len -
1649 offsetof(struct ieee80211_mgmt,
1650 u.action.u.chan_switch.variable);
1651
1652 if (ies_len < 0)
1653 break;
1654
1655 ieee802_11_parse_elems(
1656 mgmt->u.action.u.chan_switch.variable,
1657 ies_len, true, &elems, mgmt->bssid, NULL);
1658
1659 if (elems.parse_error)
1660 break;
1661
1662 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1663 rx_status, &elems);
1664 break;
1665 }
1666 }
1667
1668 mgmt_out:
1669 sdata_unlock(sdata);
1670 }
1671
1672 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1673 {
1674 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1675 struct sta_info *sta;
1676
1677 sdata_lock(sdata);
1678
1679 /*
1680 * Work could be scheduled after scan or similar
1681 * when we aren't even joined (or trying) with a
1682 * network.
1683 */
1684 if (!ifibss->ssid_len)
1685 goto out;
1686
1687 spin_lock_bh(&ifibss->incomplete_lock);
1688 while (!list_empty(&ifibss->incomplete_stations)) {
1689 sta = list_first_entry(&ifibss->incomplete_stations,
1690 struct sta_info, list);
1691 list_del(&sta->list);
1692 spin_unlock_bh(&ifibss->incomplete_lock);
1693
1694 ieee80211_ibss_finish_sta(sta);
1695 rcu_read_unlock();
1696 spin_lock_bh(&ifibss->incomplete_lock);
1697 }
1698 spin_unlock_bh(&ifibss->incomplete_lock);
1699
1700 switch (ifibss->state) {
1701 case IEEE80211_IBSS_MLME_SEARCH:
1702 ieee80211_sta_find_ibss(sdata);
1703 break;
1704 case IEEE80211_IBSS_MLME_JOINED:
1705 ieee80211_sta_merge_ibss(sdata);
1706 break;
1707 default:
1708 WARN_ON(1);
1709 break;
1710 }
1711
1712 out:
1713 sdata_unlock(sdata);
1714 }
1715
1716 static void ieee80211_ibss_timer(struct timer_list *t)
1717 {
1718 struct ieee80211_sub_if_data *sdata =
1719 from_timer(sdata, t, u.ibss.timer);
1720
1721 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1722 }
1723
1724 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1725 {
1726 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1727
1728 timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0);
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 | BSS_CHANGED_MCAST_RATE;
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 sdata->control_port_over_nl80211 = params->control_port_over_nl80211;
1850
1851 ieee80211_queue_work(&local->hw, &sdata->work);
1852
1853 return 0;
1854 }
1855
1856 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1857 {
1858 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1859
1860 ieee80211_ibss_disconnect(sdata);
1861 ifibss->ssid_len = 0;
1862 eth_zero_addr(ifibss->bssid);
1863
1864 /* remove beacon */
1865 kfree(sdata->u.ibss.ie);
1866
1867 /* on the next join, re-program HT parameters */
1868 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1869 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1870
1871 synchronize_rcu();
1872
1873 skb_queue_purge(&sdata->skb_queue);
1874
1875 del_timer_sync(&sdata->u.ibss.timer);
1876
1877 return 0;
1878 }
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