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1/*
2 * IBSS mode implementation
3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 * Copyright 2009, Johannes Berg <johannes@sipsolutions.net>
9 * Copyright 2013-2014 Intel Mobile Communications GmbH
10 * Copyright(c) 2016 Intel Deutschland GmbH
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
15 */
16
17#include <linux/delay.h>
18#include <linux/slab.h>
19#include <linux/if_ether.h>
20#include <linux/skbuff.h>
21#include <linux/if_arp.h>
22#include <linux/etherdevice.h>
23#include <linux/rtnetlink.h>
24#include <net/mac80211.h>
25
26#include "ieee80211_i.h"
27#include "driver-ops.h"
28#include "rate.h"
29
30#define IEEE80211_SCAN_INTERVAL (2 * HZ)
31#define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
32
33#define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
34#define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
35#define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ)
36
37#define IEEE80211_IBSS_MAX_STA_ENTRIES 128
38
39static struct beacon_data *
40ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata,
41 const int beacon_int, const u32 basic_rates,
42 const u16 capability, u64 tsf,
43 struct cfg80211_chan_def *chandef,
44 bool *have_higher_than_11mbit,
45 struct cfg80211_csa_settings *csa_settings)
46{
47 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
48 struct ieee80211_local *local = sdata->local;
49 int rates_n = 0, i, ri;
50 struct ieee80211_mgmt *mgmt;
51 u8 *pos;
52 struct ieee80211_supported_band *sband;
53 u32 rate_flags, rates = 0, rates_added = 0;
54 struct beacon_data *presp;
55 int frame_len;
56 int shift;
57
58 /* Build IBSS probe response */
59 frame_len = sizeof(struct ieee80211_hdr_3addr) +
60 12 /* struct ieee80211_mgmt.u.beacon */ +
61 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
62 2 + 8 /* max Supported Rates */ +
63 3 /* max DS params */ +
64 4 /* IBSS params */ +
65 5 /* Channel Switch Announcement */ +
66 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
67 2 + sizeof(struct ieee80211_ht_cap) +
68 2 + sizeof(struct ieee80211_ht_operation) +
69 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;
213error:
214 kfree(presp);
215 return NULL;
216}
217
218static 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
397static 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_WIDTH_20_NOHT);
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_WIDTH_20_NOHT);
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
483int 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 = 0;
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
537int 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
572void 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
579static 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
604static struct sta_info *
605ieee80211_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
660static 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
686static 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
746static 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
764static 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
780static bool
781ieee80211_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(¶ms, 0, sizeof(params));
809 memset(&csa_ie, 0, sizeof(csa_ie));
810 err = ieee80211_parse_ch_switch_ie(sdata, elems,
811 ifibss->chandef.chan->band,
812 sta_flags, ifibss->bssid, &csa_ie);
813 /* can't switch to destination channel, fail */
814 if (err < 0)
815 goto disconnect;
816
817 /* did not contain a CSA */
818 if (err)
819 return false;
820
821 /* channel switch is not supported, disconnect */
822 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
823 goto disconnect;
824
825 params.count = csa_ie.count;
826 params.chandef = csa_ie.chandef;
827
828 switch (ifibss->chandef.width) {
829 case NL80211_CHAN_WIDTH_20_NOHT:
830 case NL80211_CHAN_WIDTH_20:
831 case NL80211_CHAN_WIDTH_40:
832 /* keep our current HT mode (HT20/HT40+/HT40-), even if
833 * another mode has been announced. The mode is not adopted
834 * within the beacon while doing CSA and we should therefore
835 * keep the mode which we announce.
836 */
837 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
838 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan,
839 ch_type);
840 break;
841 case NL80211_CHAN_WIDTH_5:
842 case NL80211_CHAN_WIDTH_10:
843 if (params.chandef.width != ifibss->chandef.width) {
844 sdata_info(sdata,
845 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
846 ifibss->bssid,
847 params.chandef.chan->center_freq,
848 params.chandef.width,
849 params.chandef.center_freq1,
850 params.chandef.center_freq2);
851 goto disconnect;
852 }
853 break;
854 default:
855 /* should not happen, sta_flags should prevent VHT modes. */
856 WARN_ON(1);
857 goto disconnect;
858 }
859
860 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef,
861 NL80211_IFTYPE_ADHOC)) {
862 sdata_info(sdata,
863 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
864 ifibss->bssid,
865 params.chandef.chan->center_freq,
866 params.chandef.width,
867 params.chandef.center_freq1,
868 params.chandef.center_freq2);
869 goto disconnect;
870 }
871
872 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
873 ¶ms.chandef,
874 NL80211_IFTYPE_ADHOC);
875 if (err < 0)
876 goto disconnect;
877 if (err > 0 && !ifibss->userspace_handles_dfs) {
878 /* IBSS-DFS only allowed with a control program */
879 goto disconnect;
880 }
881
882 params.radar_required = err;
883
884 if (cfg80211_chandef_identical(¶ms.chandef,
885 &sdata->vif.bss_conf.chandef)) {
886 ibss_dbg(sdata,
887 "received csa with an identical chandef, ignoring\n");
888 return true;
889 }
890
891 /* all checks done, now perform the channel switch. */
892 ibss_dbg(sdata,
893 "received channel switch announcement to go to channel %d MHz\n",
894 params.chandef.chan->center_freq);
895
896 params.block_tx = !!csa_ie.mode;
897
898 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
899 ¶ms))
900 goto disconnect;
901
902 ieee80211_ibss_csa_mark_radar(sdata);
903
904 return true;
905disconnect:
906 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
907 ieee80211_queue_work(&sdata->local->hw,
908 &ifibss->csa_connection_drop_work);
909
910 ieee80211_ibss_csa_mark_radar(sdata);
911
912 return true;
913}
914
915static void
916ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
917 struct ieee80211_mgmt *mgmt, size_t len,
918 struct ieee80211_rx_status *rx_status,
919 struct ieee802_11_elems *elems)
920{
921 int required_len;
922
923 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
924 return;
925
926 /* CSA is the only action we handle for now */
927 if (mgmt->u.action.u.measurement.action_code !=
928 WLAN_ACTION_SPCT_CHL_SWITCH)
929 return;
930
931 required_len = IEEE80211_MIN_ACTION_SIZE +
932 sizeof(mgmt->u.action.u.chan_switch);
933 if (len < required_len)
934 return;
935
936 if (!sdata->vif.csa_active)
937 ieee80211_ibss_process_chanswitch(sdata, elems, false);
938}
939
940static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
941 struct ieee80211_mgmt *mgmt,
942 size_t len)
943{
944 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
945
946 if (len < IEEE80211_DEAUTH_FRAME_LEN)
947 return;
948
949 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
950 mgmt->sa, mgmt->da, mgmt->bssid, reason);
951 sta_info_destroy_addr(sdata, mgmt->sa);
952}
953
954static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
955 struct ieee80211_mgmt *mgmt,
956 size_t len)
957{
958 u16 auth_alg, auth_transaction;
959
960 sdata_assert_lock(sdata);
961
962 if (len < 24 + 6)
963 return;
964
965 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
966 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
967
968 ibss_dbg(sdata,
969 "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
970 mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
971
972 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
973 return;
974
975 /*
976 * IEEE 802.11 standard does not require authentication in IBSS
977 * networks and most implementations do not seem to use it.
978 * However, try to reply to authentication attempts if someone
979 * has actually implemented this.
980 */
981 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
982 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
983}
984
985static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
986 struct ieee80211_mgmt *mgmt, size_t len,
987 struct ieee80211_rx_status *rx_status,
988 struct ieee802_11_elems *elems,
989 struct ieee80211_channel *channel)
990{
991 struct sta_info *sta;
992 enum nl80211_band band = rx_status->band;
993 enum nl80211_bss_scan_width scan_width;
994 struct ieee80211_local *local = sdata->local;
995 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
996 bool rates_updated = false;
997 u32 supp_rates = 0;
998
999 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1000 return;
1001
1002 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
1003 return;
1004
1005 rcu_read_lock();
1006 sta = sta_info_get(sdata, mgmt->sa);
1007
1008 if (elems->supp_rates) {
1009 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1010 band, NULL);
1011 if (sta) {
1012 u32 prev_rates;
1013
1014 prev_rates = sta->sta.supp_rates[band];
1015 /* make sure mandatory rates are always added */
1016 scan_width = NL80211_BSS_CHAN_WIDTH_20;
1017 if (rx_status->flag & RX_FLAG_5MHZ)
1018 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1019 if (rx_status->flag & RX_FLAG_10MHZ)
1020 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1021
1022 sta->sta.supp_rates[band] = supp_rates |
1023 ieee80211_mandatory_rates(sband, scan_width);
1024 if (sta->sta.supp_rates[band] != prev_rates) {
1025 ibss_dbg(sdata,
1026 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1027 sta->sta.addr, prev_rates,
1028 sta->sta.supp_rates[band]);
1029 rates_updated = true;
1030 }
1031 } else {
1032 rcu_read_unlock();
1033 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1034 mgmt->sa, supp_rates);
1035 }
1036 }
1037
1038 if (sta && !sta->sta.wme &&
1039 elems->wmm_info && local->hw.queues >= IEEE80211_NUM_ACS) {
1040 sta->sta.wme = true;
1041 ieee80211_check_fast_xmit(sta);
1042 }
1043
1044 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1045 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1046 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1047 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1048 /* we both use HT */
1049 struct ieee80211_ht_cap htcap_ie;
1050 struct cfg80211_chan_def chandef;
1051 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
1052
1053 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT);
1054 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef);
1055
1056 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1057 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1058 &htcap_ie,
1059 sta);
1060
1061 if (elems->vht_operation && elems->vht_cap_elem &&
1062 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1063 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1064 /* we both use VHT */
1065 struct ieee80211_vht_cap cap_ie;
1066 struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap;
1067
1068 ieee80211_chandef_vht_oper(elems->vht_operation,
1069 &chandef);
1070 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1071 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1072 &cap_ie, sta);
1073 if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap)))
1074 rates_updated |= true;
1075 }
1076
1077 if (bw != sta->sta.bandwidth)
1078 rates_updated |= true;
1079
1080 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1081 &chandef))
1082 WARN_ON_ONCE(1);
1083 }
1084
1085 if (sta && rates_updated) {
1086 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1087 u8 rx_nss = sta->sta.rx_nss;
1088
1089 /* Force rx_nss recalculation */
1090 sta->sta.rx_nss = 0;
1091 rate_control_rate_init(sta);
1092 if (sta->sta.rx_nss != rx_nss)
1093 changed |= IEEE80211_RC_NSS_CHANGED;
1094
1095 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1096 }
1097
1098 rcu_read_unlock();
1099}
1100
1101static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1102 struct ieee80211_mgmt *mgmt, size_t len,
1103 struct ieee80211_rx_status *rx_status,
1104 struct ieee802_11_elems *elems)
1105{
1106 struct ieee80211_local *local = sdata->local;
1107 struct cfg80211_bss *cbss;
1108 struct ieee80211_bss *bss;
1109 struct ieee80211_channel *channel;
1110 u64 beacon_timestamp, rx_timestamp;
1111 u32 supp_rates = 0;
1112 enum nl80211_band band = rx_status->band;
1113
1114 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1115 if (!channel)
1116 return;
1117
1118 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1119
1120 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1121 channel);
1122 if (!bss)
1123 return;
1124
1125 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1126
1127 /* same for beacon and probe response */
1128 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1129
1130 /* check if we need to merge IBSS */
1131
1132 /* not an IBSS */
1133 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1134 goto put_bss;
1135
1136 /* different channel */
1137 if (sdata->u.ibss.fixed_channel &&
1138 sdata->u.ibss.chandef.chan != cbss->channel)
1139 goto put_bss;
1140
1141 /* different SSID */
1142 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1143 memcmp(elems->ssid, sdata->u.ibss.ssid,
1144 sdata->u.ibss.ssid_len))
1145 goto put_bss;
1146
1147 /* process channel switch */
1148 if (sdata->vif.csa_active ||
1149 ieee80211_ibss_process_chanswitch(sdata, elems, true))
1150 goto put_bss;
1151
1152 /* same BSSID */
1153 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1154 goto put_bss;
1155
1156 /* we use a fixed BSSID */
1157 if (sdata->u.ibss.fixed_bssid)
1158 goto put_bss;
1159
1160 if (ieee80211_have_rx_timestamp(rx_status)) {
1161 /* time when timestamp field was received */
1162 rx_timestamp =
1163 ieee80211_calculate_rx_timestamp(local, rx_status,
1164 len + FCS_LEN, 24);
1165 } else {
1166 /*
1167 * second best option: get current TSF
1168 * (will return -1 if not supported)
1169 */
1170 rx_timestamp = drv_get_tsf(local, sdata);
1171 }
1172
1173 ibss_dbg(sdata,
1174 "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1175 mgmt->sa, mgmt->bssid,
1176 (unsigned long long)rx_timestamp,
1177 (unsigned long long)beacon_timestamp,
1178 (unsigned long long)(rx_timestamp - beacon_timestamp),
1179 jiffies);
1180
1181 if (beacon_timestamp > rx_timestamp) {
1182 ibss_dbg(sdata,
1183 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1184 mgmt->bssid);
1185 ieee80211_sta_join_ibss(sdata, bss);
1186 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1187 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1188 supp_rates);
1189 rcu_read_unlock();
1190 }
1191
1192 put_bss:
1193 ieee80211_rx_bss_put(local, bss);
1194}
1195
1196void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1197 const u8 *bssid, const u8 *addr,
1198 u32 supp_rates)
1199{
1200 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1201 struct ieee80211_local *local = sdata->local;
1202 struct sta_info *sta;
1203 struct ieee80211_chanctx_conf *chanctx_conf;
1204 struct ieee80211_supported_band *sband;
1205 enum nl80211_bss_scan_width scan_width;
1206 int band;
1207
1208 /*
1209 * XXX: Consider removing the least recently used entry and
1210 * allow new one to be added.
1211 */
1212 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1213 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1214 sdata->name, addr);
1215 return;
1216 }
1217
1218 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1219 return;
1220
1221 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1222 return;
1223
1224 rcu_read_lock();
1225 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1226 if (WARN_ON_ONCE(!chanctx_conf)) {
1227 rcu_read_unlock();
1228 return;
1229 }
1230 band = chanctx_conf->def.chan->band;
1231 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1232 rcu_read_unlock();
1233
1234 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1235 if (!sta)
1236 return;
1237
1238 /* make sure mandatory rates are always added */
1239 sband = local->hw.wiphy->bands[band];
1240 sta->sta.supp_rates[band] = supp_rates |
1241 ieee80211_mandatory_rates(sband, scan_width);
1242
1243 spin_lock(&ifibss->incomplete_lock);
1244 list_add(&sta->list, &ifibss->incomplete_stations);
1245 spin_unlock(&ifibss->incomplete_lock);
1246 ieee80211_queue_work(&local->hw, &sdata->work);
1247}
1248
1249static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1250{
1251 struct ieee80211_local *local = sdata->local;
1252 struct sta_info *sta, *tmp;
1253 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1254 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1255
1256 mutex_lock(&local->sta_mtx);
1257
1258 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1259 unsigned long last_active = ieee80211_sta_last_active(sta);
1260
1261 if (sdata != sta->sdata)
1262 continue;
1263
1264 if (time_is_before_jiffies(last_active + exp_time) ||
1265 (time_is_before_jiffies(last_active + exp_rsn) &&
1266 sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1267 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1268 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1269 "not authorized " : "", sta->sta.addr);
1270
1271 WARN_ON(__sta_info_destroy(sta));
1272 }
1273 }
1274
1275 mutex_unlock(&local->sta_mtx);
1276}
1277
1278/*
1279 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1280 */
1281
1282static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1283{
1284 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1285 enum nl80211_bss_scan_width scan_width;
1286
1287 sdata_assert_lock(sdata);
1288
1289 mod_timer(&ifibss->timer,
1290 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1291
1292 ieee80211_ibss_sta_expire(sdata);
1293
1294 if (time_before(jiffies, ifibss->last_scan_completed +
1295 IEEE80211_IBSS_MERGE_INTERVAL))
1296 return;
1297
1298 if (ieee80211_sta_active_ibss(sdata))
1299 return;
1300
1301 if (ifibss->fixed_channel)
1302 return;
1303
1304 sdata_info(sdata,
1305 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1306
1307 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1308 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1309 NULL, 0, scan_width);
1310}
1311
1312static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1313{
1314 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1315 u8 bssid[ETH_ALEN];
1316 u16 capability;
1317 int i;
1318
1319 sdata_assert_lock(sdata);
1320
1321 if (ifibss->fixed_bssid) {
1322 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1323 } else {
1324 /* Generate random, not broadcast, locally administered BSSID. Mix in
1325 * own MAC address to make sure that devices that do not have proper
1326 * random number generator get different BSSID. */
1327 get_random_bytes(bssid, ETH_ALEN);
1328 for (i = 0; i < ETH_ALEN; i++)
1329 bssid[i] ^= sdata->vif.addr[i];
1330 bssid[0] &= ~0x01;
1331 bssid[0] |= 0x02;
1332 }
1333
1334 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1335
1336 capability = WLAN_CAPABILITY_IBSS;
1337
1338 if (ifibss->privacy)
1339 capability |= WLAN_CAPABILITY_PRIVACY;
1340
1341 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1342 &ifibss->chandef, ifibss->basic_rates,
1343 capability, 0, true);
1344}
1345
1346static unsigned ibss_setup_channels(struct wiphy *wiphy,
1347 struct ieee80211_channel **channels,
1348 unsigned int channels_max,
1349 u32 center_freq, u32 width)
1350{
1351 struct ieee80211_channel *chan = NULL;
1352 unsigned int n_chan = 0;
1353 u32 start_freq, end_freq, freq;
1354
1355 if (width <= 20) {
1356 start_freq = center_freq;
1357 end_freq = center_freq;
1358 } else {
1359 start_freq = center_freq - width / 2 + 10;
1360 end_freq = center_freq + width / 2 - 10;
1361 }
1362
1363 for (freq = start_freq; freq <= end_freq; freq += 20) {
1364 chan = ieee80211_get_channel(wiphy, freq);
1365 if (!chan)
1366 continue;
1367 if (n_chan >= channels_max)
1368 return n_chan;
1369
1370 channels[n_chan] = chan;
1371 n_chan++;
1372 }
1373
1374 return n_chan;
1375}
1376
1377static unsigned int
1378ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1379 const struct cfg80211_chan_def *chandef,
1380 struct ieee80211_channel **channels,
1381 unsigned int channels_max)
1382{
1383 unsigned int n_chan = 0;
1384 u32 width, cf1, cf2 = 0;
1385
1386 switch (chandef->width) {
1387 case NL80211_CHAN_WIDTH_40:
1388 width = 40;
1389 break;
1390 case NL80211_CHAN_WIDTH_80P80:
1391 cf2 = chandef->center_freq2;
1392 /* fall through */
1393 case NL80211_CHAN_WIDTH_80:
1394 width = 80;
1395 break;
1396 case NL80211_CHAN_WIDTH_160:
1397 width = 160;
1398 break;
1399 default:
1400 width = 20;
1401 break;
1402 }
1403
1404 cf1 = chandef->center_freq1;
1405
1406 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1407
1408 if (cf2)
1409 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1410 channels_max - n_chan, cf2,
1411 width);
1412
1413 return n_chan;
1414}
1415
1416/*
1417 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1418 */
1419
1420static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1421{
1422 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1423 struct ieee80211_local *local = sdata->local;
1424 struct cfg80211_bss *cbss;
1425 struct ieee80211_channel *chan = NULL;
1426 const u8 *bssid = NULL;
1427 enum nl80211_bss_scan_width scan_width;
1428 int active_ibss;
1429
1430 sdata_assert_lock(sdata);
1431
1432 active_ibss = ieee80211_sta_active_ibss(sdata);
1433 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1434
1435 if (active_ibss)
1436 return;
1437
1438 if (ifibss->fixed_bssid)
1439 bssid = ifibss->bssid;
1440 if (ifibss->fixed_channel)
1441 chan = ifibss->chandef.chan;
1442 if (!is_zero_ether_addr(ifibss->bssid))
1443 bssid = ifibss->bssid;
1444 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1445 ifibss->ssid, ifibss->ssid_len,
1446 IEEE80211_BSS_TYPE_IBSS,
1447 IEEE80211_PRIVACY(ifibss->privacy));
1448
1449 if (cbss) {
1450 struct ieee80211_bss *bss;
1451
1452 bss = (void *)cbss->priv;
1453 ibss_dbg(sdata,
1454 "sta_find_ibss: selected %pM current %pM\n",
1455 cbss->bssid, ifibss->bssid);
1456 sdata_info(sdata,
1457 "Selected IBSS BSSID %pM based on configured SSID\n",
1458 cbss->bssid);
1459
1460 ieee80211_sta_join_ibss(sdata, bss);
1461 ieee80211_rx_bss_put(local, bss);
1462 return;
1463 }
1464
1465 /* if a fixed bssid and a fixed freq have been provided create the IBSS
1466 * directly and do not waste time scanning
1467 */
1468 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1469 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1470 bssid);
1471 ieee80211_sta_create_ibss(sdata);
1472 return;
1473 }
1474
1475
1476 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1477
1478 /* Selected IBSS not found in current scan results - try to scan */
1479 if (time_after(jiffies, ifibss->last_scan_completed +
1480 IEEE80211_SCAN_INTERVAL)) {
1481 struct ieee80211_channel *channels[8];
1482 unsigned int num;
1483
1484 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1485
1486 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1487
1488 if (ifibss->fixed_channel) {
1489 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1490 &ifibss->chandef,
1491 channels,
1492 ARRAY_SIZE(channels));
1493 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1494 ifibss->ssid_len, channels,
1495 num, scan_width);
1496 } else {
1497 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1498 ifibss->ssid_len, NULL,
1499 0, scan_width);
1500 }
1501 } else {
1502 int interval = IEEE80211_SCAN_INTERVAL;
1503
1504 if (time_after(jiffies, ifibss->ibss_join_req +
1505 IEEE80211_IBSS_JOIN_TIMEOUT))
1506 ieee80211_sta_create_ibss(sdata);
1507
1508 mod_timer(&ifibss->timer,
1509 round_jiffies(jiffies + interval));
1510 }
1511}
1512
1513static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1514 struct sk_buff *req)
1515{
1516 struct ieee80211_mgmt *mgmt = (void *)req->data;
1517 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1518 struct ieee80211_local *local = sdata->local;
1519 int tx_last_beacon, len = req->len;
1520 struct sk_buff *skb;
1521 struct beacon_data *presp;
1522 u8 *pos, *end;
1523
1524 sdata_assert_lock(sdata);
1525
1526 presp = rcu_dereference_protected(ifibss->presp,
1527 lockdep_is_held(&sdata->wdev.mtx));
1528
1529 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1530 len < 24 + 2 || !presp)
1531 return;
1532
1533 tx_last_beacon = drv_tx_last_beacon(local);
1534
1535 ibss_dbg(sdata,
1536 "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
1537 mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
1538
1539 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1540 return;
1541
1542 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1543 !is_broadcast_ether_addr(mgmt->bssid))
1544 return;
1545
1546 end = ((u8 *) mgmt) + len;
1547 pos = mgmt->u.probe_req.variable;
1548 if (pos[0] != WLAN_EID_SSID ||
1549 pos + 2 + pos[1] > end) {
1550 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1551 mgmt->sa);
1552 return;
1553 }
1554 if (pos[1] != 0 &&
1555 (pos[1] != ifibss->ssid_len ||
1556 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1557 /* Ignore ProbeReq for foreign SSID */
1558 return;
1559 }
1560
1561 /* Reply with ProbeResp */
1562 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1563 if (!skb)
1564 return;
1565
1566 skb_reserve(skb, local->tx_headroom);
1567 memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
1568
1569 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1570 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1571 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1572
1573 /* avoid excessive retries for probe request to wildcard SSIDs */
1574 if (pos[1] == 0)
1575 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1576
1577 ieee80211_tx_skb(sdata, skb);
1578}
1579
1580static
1581void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1582 struct ieee80211_mgmt *mgmt, size_t len,
1583 struct ieee80211_rx_status *rx_status)
1584{
1585 size_t baselen;
1586 struct ieee802_11_elems elems;
1587
1588 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1589 offsetof(typeof(mgmt->u.beacon), variable));
1590
1591 /*
1592 * either beacon or probe_resp but the variable field is at the
1593 * same offset
1594 */
1595 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1596 if (baselen > len)
1597 return;
1598
1599 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1600 false, &elems);
1601
1602 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1603}
1604
1605void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1606 struct sk_buff *skb)
1607{
1608 struct ieee80211_rx_status *rx_status;
1609 struct ieee80211_mgmt *mgmt;
1610 u16 fc;
1611 struct ieee802_11_elems elems;
1612 int ies_len;
1613
1614 rx_status = IEEE80211_SKB_RXCB(skb);
1615 mgmt = (struct ieee80211_mgmt *) skb->data;
1616 fc = le16_to_cpu(mgmt->frame_control);
1617
1618 sdata_lock(sdata);
1619
1620 if (!sdata->u.ibss.ssid_len)
1621 goto mgmt_out; /* not ready to merge yet */
1622
1623 switch (fc & IEEE80211_FCTL_STYPE) {
1624 case IEEE80211_STYPE_PROBE_REQ:
1625 ieee80211_rx_mgmt_probe_req(sdata, skb);
1626 break;
1627 case IEEE80211_STYPE_PROBE_RESP:
1628 case IEEE80211_STYPE_BEACON:
1629 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1630 rx_status);
1631 break;
1632 case IEEE80211_STYPE_AUTH:
1633 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1634 break;
1635 case IEEE80211_STYPE_DEAUTH:
1636 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1637 break;
1638 case IEEE80211_STYPE_ACTION:
1639 switch (mgmt->u.action.category) {
1640 case WLAN_CATEGORY_SPECTRUM_MGMT:
1641 ies_len = skb->len -
1642 offsetof(struct ieee80211_mgmt,
1643 u.action.u.chan_switch.variable);
1644
1645 if (ies_len < 0)
1646 break;
1647
1648 ieee802_11_parse_elems(
1649 mgmt->u.action.u.chan_switch.variable,
1650 ies_len, true, &elems);
1651
1652 if (elems.parse_error)
1653 break;
1654
1655 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1656 rx_status, &elems);
1657 break;
1658 }
1659 }
1660
1661 mgmt_out:
1662 sdata_unlock(sdata);
1663}
1664
1665void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1666{
1667 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1668 struct sta_info *sta;
1669
1670 sdata_lock(sdata);
1671
1672 /*
1673 * Work could be scheduled after scan or similar
1674 * when we aren't even joined (or trying) with a
1675 * network.
1676 */
1677 if (!ifibss->ssid_len)
1678 goto out;
1679
1680 spin_lock_bh(&ifibss->incomplete_lock);
1681 while (!list_empty(&ifibss->incomplete_stations)) {
1682 sta = list_first_entry(&ifibss->incomplete_stations,
1683 struct sta_info, list);
1684 list_del(&sta->list);
1685 spin_unlock_bh(&ifibss->incomplete_lock);
1686
1687 ieee80211_ibss_finish_sta(sta);
1688 rcu_read_unlock();
1689 spin_lock_bh(&ifibss->incomplete_lock);
1690 }
1691 spin_unlock_bh(&ifibss->incomplete_lock);
1692
1693 switch (ifibss->state) {
1694 case IEEE80211_IBSS_MLME_SEARCH:
1695 ieee80211_sta_find_ibss(sdata);
1696 break;
1697 case IEEE80211_IBSS_MLME_JOINED:
1698 ieee80211_sta_merge_ibss(sdata);
1699 break;
1700 default:
1701 WARN_ON(1);
1702 break;
1703 }
1704
1705 out:
1706 sdata_unlock(sdata);
1707}
1708
1709static void ieee80211_ibss_timer(unsigned long data)
1710{
1711 struct ieee80211_sub_if_data *sdata =
1712 (struct ieee80211_sub_if_data *) data;
1713
1714 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1715}
1716
1717void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1718{
1719 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1720
1721 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1722 (unsigned long) sdata);
1723 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1724 spin_lock_init(&ifibss->incomplete_lock);
1725 INIT_WORK(&ifibss->csa_connection_drop_work,
1726 ieee80211_csa_connection_drop_work);
1727}
1728
1729/* scan finished notification */
1730void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1731{
1732 struct ieee80211_sub_if_data *sdata;
1733
1734 mutex_lock(&local->iflist_mtx);
1735 list_for_each_entry(sdata, &local->interfaces, list) {
1736 if (!ieee80211_sdata_running(sdata))
1737 continue;
1738 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1739 continue;
1740 sdata->u.ibss.last_scan_completed = jiffies;
1741 }
1742 mutex_unlock(&local->iflist_mtx);
1743}
1744
1745int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1746 struct cfg80211_ibss_params *params)
1747{
1748 u32 changed = 0;
1749 u32 rate_flags;
1750 struct ieee80211_supported_band *sband;
1751 enum ieee80211_chanctx_mode chanmode;
1752 struct ieee80211_local *local = sdata->local;
1753 int radar_detect_width = 0;
1754 int i;
1755 int ret;
1756
1757 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1758 ¶ms->chandef,
1759 sdata->wdev.iftype);
1760 if (ret < 0)
1761 return ret;
1762
1763 if (ret > 0) {
1764 if (!params->userspace_handles_dfs)
1765 return -EINVAL;
1766 radar_detect_width = BIT(params->chandef.width);
1767 }
1768
1769 chanmode = (params->channel_fixed && !ret) ?
1770 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1771
1772 mutex_lock(&local->chanctx_mtx);
1773 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode,
1774 radar_detect_width);
1775 mutex_unlock(&local->chanctx_mtx);
1776 if (ret < 0)
1777 return ret;
1778
1779 if (params->bssid) {
1780 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1781 sdata->u.ibss.fixed_bssid = true;
1782 } else
1783 sdata->u.ibss.fixed_bssid = false;
1784
1785 sdata->u.ibss.privacy = params->privacy;
1786 sdata->u.ibss.control_port = params->control_port;
1787 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1788 sdata->u.ibss.basic_rates = params->basic_rates;
1789 sdata->u.ibss.last_scan_completed = jiffies;
1790
1791 /* fix basic_rates if channel does not support these rates */
1792 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef);
1793 sband = local->hw.wiphy->bands[params->chandef.chan->band];
1794 for (i = 0; i < sband->n_bitrates; i++) {
1795 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1796 sdata->u.ibss.basic_rates &= ~BIT(i);
1797 }
1798 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1799 sizeof(params->mcast_rate));
1800
1801 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1802
1803 sdata->u.ibss.chandef = params->chandef;
1804 sdata->u.ibss.fixed_channel = params->channel_fixed;
1805
1806 if (params->ie) {
1807 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1808 GFP_KERNEL);
1809 if (sdata->u.ibss.ie)
1810 sdata->u.ibss.ie_len = params->ie_len;
1811 }
1812
1813 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1814 sdata->u.ibss.ibss_join_req = jiffies;
1815
1816 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1817 sdata->u.ibss.ssid_len = params->ssid_len;
1818
1819 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa,
1820 sizeof(sdata->u.ibss.ht_capa));
1821 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask,
1822 sizeof(sdata->u.ibss.ht_capa_mask));
1823
1824 /*
1825 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1826 * reserved, but an HT STA shall protect HT transmissions as though
1827 * the HT Protection field were set to non-HT mixed mode.
1828 *
1829 * In an IBSS, the RIFS Mode field of the HT Operation element is
1830 * also reserved, but an HT STA shall operate as though this field
1831 * were set to 1.
1832 */
1833
1834 sdata->vif.bss_conf.ht_operation_mode |=
1835 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1836 | IEEE80211_HT_PARAM_RIFS_MODE;
1837
1838 changed |= BSS_CHANGED_HT;
1839 ieee80211_bss_info_change_notify(sdata, changed);
1840
1841 sdata->smps_mode = IEEE80211_SMPS_OFF;
1842 sdata->needed_rx_chains = local->rx_chains;
1843
1844 ieee80211_queue_work(&local->hw, &sdata->work);
1845
1846 return 0;
1847}
1848
1849int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1850{
1851 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1852
1853 ieee80211_ibss_disconnect(sdata);
1854 ifibss->ssid_len = 0;
1855 eth_zero_addr(ifibss->bssid);
1856
1857 /* remove beacon */
1858 kfree(sdata->u.ibss.ie);
1859
1860 /* on the next join, re-program HT parameters */
1861 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1862 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1863
1864 synchronize_rcu();
1865
1866 skb_queue_purge(&sdata->skb_queue);
1867
1868 del_timer_sync(&sdata->u.ibss.timer);
1869
1870 return 0;
1871}
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) 2018-2024 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
37static struct beacon_data *
38ieee80211_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
55 /* Build IBSS probe response */
56 frame_len = sizeof(struct ieee80211_hdr_3addr) +
57 12 /* struct ieee80211_mgmt.u.beacon */ +
58 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
59 2 + 8 /* max Supported Rates */ +
60 3 /* max DS params */ +
61 4 /* IBSS params */ +
62 5 /* Channel Switch Announcement */ +
63 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
64 2 + sizeof(struct ieee80211_ht_cap) +
65 2 + sizeof(struct ieee80211_ht_operation) +
66 2 + sizeof(struct ieee80211_vht_cap) +
67 2 + sizeof(struct ieee80211_vht_operation) +
68 ifibss->ie_len;
69 presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
70 if (!presp)
71 return NULL;
72
73 presp->head = (void *)(presp + 1);
74
75 mgmt = (void *) presp->head;
76 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
77 IEEE80211_STYPE_PROBE_RESP);
78 eth_broadcast_addr(mgmt->da);
79 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
80 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
81 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
82 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
83 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
84
85 pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
86
87 *pos++ = WLAN_EID_SSID;
88 *pos++ = ifibss->ssid_len;
89 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
90 pos += ifibss->ssid_len;
91
92 sband = local->hw.wiphy->bands[chandef->chan->band];
93 rate_flags = ieee80211_chandef_rate_flags(chandef);
94 rates_n = 0;
95 if (have_higher_than_11mbit)
96 *have_higher_than_11mbit = false;
97
98 for (i = 0; i < sband->n_bitrates; i++) {
99 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
100 continue;
101 if (sband->bitrates[i].bitrate > 110 &&
102 have_higher_than_11mbit)
103 *have_higher_than_11mbit = true;
104
105 rates |= BIT(i);
106 rates_n++;
107 }
108
109 *pos++ = WLAN_EID_SUPP_RATES;
110 *pos++ = min_t(int, 8, rates_n);
111 for (ri = 0; ri < sband->n_bitrates; ri++) {
112 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 5);
113 u8 basic = 0;
114 if (!(rates & BIT(ri)))
115 continue;
116
117 if (basic_rates & BIT(ri))
118 basic = 0x80;
119 *pos++ = basic | (u8) rate;
120 if (++rates_added == 8) {
121 ri++; /* continue at next rate for EXT_SUPP_RATES */
122 break;
123 }
124 }
125
126 if (sband->band == NL80211_BAND_2GHZ) {
127 *pos++ = WLAN_EID_DS_PARAMS;
128 *pos++ = 1;
129 *pos++ = ieee80211_frequency_to_channel(
130 chandef->chan->center_freq);
131 }
132
133 *pos++ = WLAN_EID_IBSS_PARAMS;
134 *pos++ = 2;
135 /* FIX: set ATIM window based on scan results */
136 *pos++ = 0;
137 *pos++ = 0;
138
139 if (csa_settings) {
140 *pos++ = WLAN_EID_CHANNEL_SWITCH;
141 *pos++ = 3;
142 *pos++ = csa_settings->block_tx ? 1 : 0;
143 *pos++ = ieee80211_frequency_to_channel(
144 csa_settings->chandef.chan->center_freq);
145 presp->cntdwn_counter_offsets[0] = (pos - presp->head);
146 *pos++ = csa_settings->count;
147 presp->cntdwn_current_counter = csa_settings->count;
148 }
149
150 /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
151 if (rates_n > 8) {
152 *pos++ = WLAN_EID_EXT_SUPP_RATES;
153 *pos++ = rates_n - 8;
154 for (; ri < sband->n_bitrates; ri++) {
155 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 5);
156 u8 basic = 0;
157 if (!(rates & BIT(ri)))
158 continue;
159
160 if (basic_rates & BIT(ri))
161 basic = 0x80;
162 *pos++ = basic | (u8) rate;
163 }
164 }
165
166 if (ifibss->ie_len) {
167 memcpy(pos, ifibss->ie, ifibss->ie_len);
168 pos += ifibss->ie_len;
169 }
170
171 /* add HT capability and information IEs */
172 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
173 chandef->width != NL80211_CHAN_WIDTH_5 &&
174 chandef->width != NL80211_CHAN_WIDTH_10 &&
175 sband->ht_cap.ht_supported) {
176 struct ieee80211_sta_ht_cap ht_cap;
177
178 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
179 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
180
181 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
182 /*
183 * Note: According to 802.11n-2009 9.13.3.1, HT Protection
184 * field and RIFS Mode are reserved in IBSS mode, therefore
185 * keep them at 0
186 */
187 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
188 chandef, 0, false);
189
190 /* add VHT capability and information IEs */
191 if (chandef->width != NL80211_CHAN_WIDTH_20 &&
192 chandef->width != NL80211_CHAN_WIDTH_40 &&
193 sband->vht_cap.vht_supported) {
194 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
195 sband->vht_cap.cap);
196 pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap,
197 chandef);
198 }
199 }
200
201 if (local->hw.queues >= IEEE80211_NUM_ACS)
202 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */
203
204 presp->head_len = pos - presp->head;
205 if (WARN_ON(presp->head_len > frame_len))
206 goto error;
207
208 return presp;
209error:
210 kfree(presp);
211 return NULL;
212}
213
214static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
215 const u8 *bssid, const int beacon_int,
216 struct cfg80211_chan_def *req_chandef,
217 const u32 basic_rates,
218 const u16 capability, u64 tsf,
219 bool creator)
220{
221 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
222 struct ieee80211_local *local = sdata->local;
223 struct ieee80211_mgmt *mgmt;
224 struct cfg80211_bss *bss;
225 u64 bss_change;
226 struct ieee80211_chan_req chanreq = {};
227 struct ieee80211_channel *chan;
228 struct beacon_data *presp;
229 struct cfg80211_inform_bss bss_meta = {};
230 bool have_higher_than_11mbit;
231 bool radar_required;
232 int err;
233
234 lockdep_assert_wiphy(local->hw.wiphy);
235
236 /* Reset own TSF to allow time synchronization work. */
237 drv_reset_tsf(local, sdata);
238
239 if (!ether_addr_equal(ifibss->bssid, bssid))
240 sta_info_flush(sdata, -1);
241
242 /* if merging, indicate to driver that we leave the old IBSS */
243 if (sdata->vif.cfg.ibss_joined) {
244 sdata->vif.cfg.ibss_joined = false;
245 sdata->vif.cfg.ibss_creator = false;
246 sdata->vif.bss_conf.enable_beacon = false;
247 netif_carrier_off(sdata->dev);
248 ieee80211_bss_info_change_notify(sdata,
249 BSS_CHANGED_IBSS |
250 BSS_CHANGED_BEACON_ENABLED);
251 drv_leave_ibss(local, sdata);
252 }
253
254 presp = sdata_dereference(ifibss->presp, sdata);
255 RCU_INIT_POINTER(ifibss->presp, NULL);
256 if (presp)
257 kfree_rcu(presp, rcu_head);
258
259 /* make a copy of the chandef, it could be modified below. */
260 chanreq.oper = *req_chandef;
261 chan = chanreq.oper.chan;
262 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chanreq.oper,
263 NL80211_IFTYPE_ADHOC)) {
264 if (chanreq.oper.width == NL80211_CHAN_WIDTH_5 ||
265 chanreq.oper.width == NL80211_CHAN_WIDTH_10 ||
266 chanreq.oper.width == NL80211_CHAN_WIDTH_20_NOHT ||
267 chanreq.oper.width == NL80211_CHAN_WIDTH_20) {
268 sdata_info(sdata,
269 "Failed to join IBSS, beacons forbidden\n");
270 return;
271 }
272 chanreq.oper.width = NL80211_CHAN_WIDTH_20;
273 chanreq.oper.center_freq1 = chan->center_freq;
274 /* check again for downgraded chandef */
275 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chanreq.oper,
276 NL80211_IFTYPE_ADHOC)) {
277 sdata_info(sdata,
278 "Failed to join IBSS, beacons forbidden\n");
279 return;
280 }
281 }
282
283 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
284 &chanreq.oper, NL80211_IFTYPE_ADHOC);
285 if (err < 0) {
286 sdata_info(sdata,
287 "Failed to join IBSS, invalid chandef\n");
288 return;
289 }
290 if (err > 0 && !ifibss->userspace_handles_dfs) {
291 sdata_info(sdata,
292 "Failed to join IBSS, DFS channel without control program\n");
293 return;
294 }
295
296 radar_required = err;
297
298 if (ieee80211_link_use_channel(&sdata->deflink, &chanreq,
299 ifibss->fixed_channel ?
300 IEEE80211_CHANCTX_SHARED :
301 IEEE80211_CHANCTX_EXCLUSIVE)) {
302 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
303 return;
304 }
305 sdata->deflink.radar_required = radar_required;
306
307 memcpy(ifibss->bssid, bssid, ETH_ALEN);
308
309 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
310 capability, tsf, &chanreq.oper,
311 &have_higher_than_11mbit, NULL);
312 if (!presp)
313 return;
314
315 rcu_assign_pointer(ifibss->presp, presp);
316 mgmt = (void *)presp->head;
317
318 sdata->vif.bss_conf.enable_beacon = true;
319 sdata->vif.bss_conf.beacon_int = beacon_int;
320 sdata->vif.bss_conf.basic_rates = basic_rates;
321 sdata->vif.cfg.ssid_len = ifibss->ssid_len;
322 memcpy(sdata->vif.cfg.ssid, ifibss->ssid, ifibss->ssid_len);
323 bss_change = BSS_CHANGED_BEACON_INT;
324 bss_change |= ieee80211_reset_erp_info(sdata);
325 bss_change |= BSS_CHANGED_BSSID;
326 bss_change |= BSS_CHANGED_BEACON;
327 bss_change |= BSS_CHANGED_BEACON_ENABLED;
328 bss_change |= BSS_CHANGED_BASIC_RATES;
329 bss_change |= BSS_CHANGED_HT;
330 bss_change |= BSS_CHANGED_IBSS;
331 bss_change |= BSS_CHANGED_SSID;
332
333 /*
334 * In 5 GHz/802.11a, we can always use short slot time.
335 * (IEEE 802.11-2012 18.3.8.7)
336 *
337 * In 2.4GHz, we must always use long slots in IBSS for compatibility
338 * reasons.
339 * (IEEE 802.11-2012 19.4.5)
340 *
341 * HT follows these specifications (IEEE 802.11-2012 20.3.18)
342 */
343 sdata->vif.bss_conf.use_short_slot = chan->band == NL80211_BAND_5GHZ;
344 bss_change |= BSS_CHANGED_ERP_SLOT;
345
346 /* cf. IEEE 802.11 9.2.12 */
347 sdata->deflink.operating_11g_mode =
348 chan->band == NL80211_BAND_2GHZ && have_higher_than_11mbit;
349
350 ieee80211_set_wmm_default(&sdata->deflink, true, false);
351
352 sdata->vif.cfg.ibss_joined = true;
353 sdata->vif.cfg.ibss_creator = creator;
354
355 err = drv_join_ibss(local, sdata);
356 if (err) {
357 sdata->vif.cfg.ibss_joined = false;
358 sdata->vif.cfg.ibss_creator = false;
359 sdata->vif.bss_conf.enable_beacon = false;
360 sdata->vif.cfg.ssid_len = 0;
361 RCU_INIT_POINTER(ifibss->presp, NULL);
362 kfree_rcu(presp, rcu_head);
363 ieee80211_link_release_channel(&sdata->deflink);
364 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
365 err);
366 return;
367 }
368
369 ieee80211_bss_info_change_notify(sdata, bss_change);
370
371 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
372 mod_timer(&ifibss->timer,
373 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
374
375 bss_meta.chan = chan;
376 bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt,
377 presp->head_len, GFP_KERNEL);
378
379 cfg80211_put_bss(local->hw.wiphy, bss);
380 netif_carrier_on(sdata->dev);
381 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
382}
383
384static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
385 struct ieee80211_bss *bss)
386{
387 struct cfg80211_bss *cbss =
388 container_of((void *)bss, struct cfg80211_bss, priv);
389 struct ieee80211_supported_band *sband;
390 struct cfg80211_chan_def chandef;
391 u32 basic_rates;
392 int i, j;
393 u16 beacon_int = cbss->beacon_interval;
394 const struct cfg80211_bss_ies *ies;
395 enum nl80211_channel_type chan_type;
396 u64 tsf;
397 u32 rate_flags;
398
399 lockdep_assert_wiphy(sdata->local->hw.wiphy);
400
401 if (beacon_int < 10)
402 beacon_int = 10;
403
404 switch (sdata->u.ibss.chandef.width) {
405 case NL80211_CHAN_WIDTH_20_NOHT:
406 case NL80211_CHAN_WIDTH_20:
407 case NL80211_CHAN_WIDTH_40:
408 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
409 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
410 break;
411 case NL80211_CHAN_WIDTH_5:
412 case NL80211_CHAN_WIDTH_10:
413 cfg80211_chandef_create(&chandef, cbss->channel,
414 NL80211_CHAN_NO_HT);
415 chandef.width = sdata->u.ibss.chandef.width;
416 break;
417 case NL80211_CHAN_WIDTH_80:
418 case NL80211_CHAN_WIDTH_80P80:
419 case NL80211_CHAN_WIDTH_160:
420 chandef = sdata->u.ibss.chandef;
421 chandef.chan = cbss->channel;
422 break;
423 default:
424 /* fall back to 20 MHz for unsupported modes */
425 cfg80211_chandef_create(&chandef, cbss->channel,
426 NL80211_CHAN_NO_HT);
427 break;
428 }
429
430 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
431 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
432
433 basic_rates = 0;
434
435 for (i = 0; i < bss->supp_rates_len; i++) {
436 int rate = bss->supp_rates[i] & 0x7f;
437 bool is_basic = !!(bss->supp_rates[i] & 0x80);
438
439 for (j = 0; j < sband->n_bitrates; j++) {
440 int brate;
441 if ((rate_flags & sband->bitrates[j].flags)
442 != rate_flags)
443 continue;
444
445 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate, 5);
446 if (brate == rate) {
447 if (is_basic)
448 basic_rates |= BIT(j);
449 break;
450 }
451 }
452 }
453
454 rcu_read_lock();
455 ies = rcu_dereference(cbss->ies);
456 tsf = ies->tsf;
457 rcu_read_unlock();
458
459 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
460 beacon_int,
461 &chandef,
462 basic_rates,
463 cbss->capability,
464 tsf, false);
465}
466
467int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
468 struct cfg80211_csa_settings *csa_settings,
469 u64 *changed)
470{
471 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
472 struct beacon_data *presp, *old_presp;
473 struct cfg80211_bss *cbss;
474 const struct cfg80211_bss_ies *ies;
475 u16 capability = WLAN_CAPABILITY_IBSS;
476 u64 tsf;
477
478 lockdep_assert_wiphy(sdata->local->hw.wiphy);
479
480 if (ifibss->privacy)
481 capability |= WLAN_CAPABILITY_PRIVACY;
482
483 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
484 ifibss->bssid, ifibss->ssid,
485 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS,
486 IEEE80211_PRIVACY(ifibss->privacy));
487
488 if (unlikely(!cbss))
489 return -EINVAL;
490
491 rcu_read_lock();
492 ies = rcu_dereference(cbss->ies);
493 tsf = ies->tsf;
494 rcu_read_unlock();
495 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
496
497 old_presp = sdata_dereference(ifibss->presp, sdata);
498
499 presp = ieee80211_ibss_build_presp(sdata,
500 sdata->vif.bss_conf.beacon_int,
501 sdata->vif.bss_conf.basic_rates,
502 capability, tsf, &ifibss->chandef,
503 NULL, csa_settings);
504 if (!presp)
505 return -ENOMEM;
506
507 rcu_assign_pointer(ifibss->presp, presp);
508 if (old_presp)
509 kfree_rcu(old_presp, rcu_head);
510
511 *changed |= BSS_CHANGED_BEACON;
512 return 0;
513}
514
515int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata, u64 *changed)
516{
517 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
518 struct cfg80211_bss *cbss;
519
520 lockdep_assert_wiphy(sdata->local->hw.wiphy);
521
522 /* When not connected/joined, sending CSA doesn't make sense. */
523 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED)
524 return -ENOLINK;
525
526 /* update cfg80211 bss information with the new channel */
527 if (!is_zero_ether_addr(ifibss->bssid)) {
528 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
529 ifibss->chandef.chan,
530 ifibss->bssid, ifibss->ssid,
531 ifibss->ssid_len,
532 IEEE80211_BSS_TYPE_IBSS,
533 IEEE80211_PRIVACY(ifibss->privacy));
534 /* XXX: should not really modify cfg80211 data */
535 if (cbss) {
536 cbss->channel = sdata->deflink.csa.chanreq.oper.chan;
537 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
538 }
539 }
540
541 ifibss->chandef = sdata->deflink.csa.chanreq.oper;
542
543 /* generate the beacon */
544 return ieee80211_ibss_csa_beacon(sdata, NULL, changed);
545}
546
547void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
548{
549 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
550
551 wiphy_work_cancel(sdata->local->hw.wiphy,
552 &ifibss->csa_connection_drop_work);
553}
554
555static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
556 __acquires(RCU)
557{
558 struct ieee80211_sub_if_data *sdata = sta->sdata;
559 u8 addr[ETH_ALEN];
560
561 memcpy(addr, sta->sta.addr, ETH_ALEN);
562
563 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
564
565 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
566 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
567 /* authorize the station only if the network is not RSN protected. If
568 * not wait for the userspace to authorize it */
569 if (!sta->sdata->u.ibss.control_port)
570 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
571
572 rate_control_rate_init(&sta->deflink);
573
574 /* If it fails, maybe we raced another insertion? */
575 if (sta_info_insert_rcu(sta))
576 return sta_info_get(sdata, addr);
577 return sta;
578}
579
580static struct sta_info *
581ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
582 const u8 *addr, u32 supp_rates)
583 __acquires(RCU)
584{
585 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
586 struct ieee80211_local *local = sdata->local;
587 struct sta_info *sta;
588 struct ieee80211_chanctx_conf *chanctx_conf;
589 struct ieee80211_supported_band *sband;
590 int band;
591
592 /*
593 * XXX: Consider removing the least recently used entry and
594 * allow new one to be added.
595 */
596 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
597 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
598 sdata->name, addr);
599 rcu_read_lock();
600 return NULL;
601 }
602
603 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
604 rcu_read_lock();
605 return NULL;
606 }
607
608 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
609 rcu_read_lock();
610 return NULL;
611 }
612
613 rcu_read_lock();
614 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
615 if (WARN_ON_ONCE(!chanctx_conf))
616 return NULL;
617 band = chanctx_conf->def.chan->band;
618 rcu_read_unlock();
619
620 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
621 if (!sta) {
622 rcu_read_lock();
623 return NULL;
624 }
625
626 /* make sure mandatory rates are always added */
627 sband = local->hw.wiphy->bands[band];
628 sta->sta.deflink.supp_rates[band] = supp_rates |
629 ieee80211_mandatory_rates(sband);
630
631 return ieee80211_ibss_finish_sta(sta);
632}
633
634static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
635{
636 struct ieee80211_local *local = sdata->local;
637 int active = 0;
638 struct sta_info *sta;
639
640 lockdep_assert_wiphy(sdata->local->hw.wiphy);
641
642 rcu_read_lock();
643
644 list_for_each_entry_rcu(sta, &local->sta_list, list) {
645 unsigned long last_active = ieee80211_sta_last_active(sta);
646
647 if (sta->sdata == sdata &&
648 time_is_after_jiffies(last_active +
649 IEEE80211_IBSS_MERGE_INTERVAL)) {
650 active++;
651 break;
652 }
653 }
654
655 rcu_read_unlock();
656
657 return active;
658}
659
660static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
661{
662 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
663 struct ieee80211_local *local = sdata->local;
664 struct cfg80211_bss *cbss;
665 struct beacon_data *presp;
666 struct sta_info *sta;
667
668 lockdep_assert_wiphy(local->hw.wiphy);
669
670 if (!is_zero_ether_addr(ifibss->bssid)) {
671 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
672 ifibss->bssid, ifibss->ssid,
673 ifibss->ssid_len,
674 IEEE80211_BSS_TYPE_IBSS,
675 IEEE80211_PRIVACY(ifibss->privacy));
676
677 if (cbss) {
678 cfg80211_unlink_bss(local->hw.wiphy, cbss);
679 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
680 }
681 }
682
683 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
684
685 sta_info_flush(sdata, -1);
686
687 spin_lock_bh(&ifibss->incomplete_lock);
688 while (!list_empty(&ifibss->incomplete_stations)) {
689 sta = list_first_entry(&ifibss->incomplete_stations,
690 struct sta_info, list);
691 list_del(&sta->list);
692 spin_unlock_bh(&ifibss->incomplete_lock);
693
694 sta_info_free(local, sta);
695 spin_lock_bh(&ifibss->incomplete_lock);
696 }
697 spin_unlock_bh(&ifibss->incomplete_lock);
698
699 netif_carrier_off(sdata->dev);
700
701 sdata->vif.cfg.ibss_joined = false;
702 sdata->vif.cfg.ibss_creator = false;
703 sdata->vif.bss_conf.enable_beacon = false;
704 sdata->vif.cfg.ssid_len = 0;
705
706 /* remove beacon */
707 presp = sdata_dereference(ifibss->presp, sdata);
708 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
709 if (presp)
710 kfree_rcu(presp, rcu_head);
711
712 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
713 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
714 BSS_CHANGED_IBSS);
715 drv_leave_ibss(local, sdata);
716 ieee80211_link_release_channel(&sdata->deflink);
717}
718
719static void ieee80211_csa_connection_drop_work(struct wiphy *wiphy,
720 struct wiphy_work *work)
721{
722 struct ieee80211_sub_if_data *sdata =
723 container_of(work, struct ieee80211_sub_if_data,
724 u.ibss.csa_connection_drop_work);
725
726 ieee80211_ibss_disconnect(sdata);
727 synchronize_rcu();
728 skb_queue_purge(&sdata->skb_queue);
729
730 /* trigger a scan to find another IBSS network to join */
731 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
732}
733
734static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
735{
736 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
737 int err;
738
739 /* if the current channel is a DFS channel, mark the channel as
740 * unavailable.
741 */
742 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
743 &ifibss->chandef,
744 NL80211_IFTYPE_ADHOC);
745 if (err > 0)
746 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
747 GFP_ATOMIC);
748}
749
750static bool
751ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
752 struct ieee802_11_elems *elems,
753 bool beacon)
754{
755 struct cfg80211_csa_settings params;
756 struct ieee80211_csa_ie csa_ie;
757 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
758 enum nl80211_channel_type ch_type;
759 int err;
760 struct ieee80211_conn_settings conn = {
761 .mode = IEEE80211_CONN_MODE_HT,
762 .bw_limit = IEEE80211_CONN_BW_LIMIT_40,
763 };
764 u32 vht_cap_info = 0;
765
766 lockdep_assert_wiphy(sdata->local->hw.wiphy);
767
768 switch (ifibss->chandef.width) {
769 case NL80211_CHAN_WIDTH_5:
770 case NL80211_CHAN_WIDTH_10:
771 case NL80211_CHAN_WIDTH_20_NOHT:
772 conn.mode = IEEE80211_CONN_MODE_LEGACY;
773 fallthrough;
774 case NL80211_CHAN_WIDTH_20:
775 conn.bw_limit = IEEE80211_CONN_BW_LIMIT_20;
776 break;
777 default:
778 break;
779 }
780
781 if (elems->vht_cap_elem)
782 vht_cap_info = le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
783
784 memset(¶ms, 0, sizeof(params));
785 err = ieee80211_parse_ch_switch_ie(sdata, elems,
786 ifibss->chandef.chan->band,
787 vht_cap_info, &conn,
788 ifibss->bssid, false,
789 &csa_ie);
790 /* can't switch to destination channel, fail */
791 if (err < 0)
792 goto disconnect;
793
794 /* did not contain a CSA */
795 if (err)
796 return false;
797
798 /* channel switch is not supported, disconnect */
799 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
800 goto disconnect;
801
802 params.count = csa_ie.count;
803 params.chandef = csa_ie.chanreq.oper;
804
805 switch (ifibss->chandef.width) {
806 case NL80211_CHAN_WIDTH_20_NOHT:
807 case NL80211_CHAN_WIDTH_20:
808 case NL80211_CHAN_WIDTH_40:
809 /* keep our current HT mode (HT20/HT40+/HT40-), even if
810 * another mode has been announced. The mode is not adopted
811 * within the beacon while doing CSA and we should therefore
812 * keep the mode which we announce.
813 */
814 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
815 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan,
816 ch_type);
817 break;
818 case NL80211_CHAN_WIDTH_5:
819 case NL80211_CHAN_WIDTH_10:
820 if (params.chandef.width != ifibss->chandef.width) {
821 sdata_info(sdata,
822 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
823 ifibss->bssid,
824 params.chandef.chan->center_freq,
825 params.chandef.width,
826 params.chandef.center_freq1,
827 params.chandef.center_freq2);
828 goto disconnect;
829 }
830 break;
831 default:
832 /* should not happen, conn_flags should prevent VHT modes. */
833 WARN_ON(1);
834 goto disconnect;
835 }
836
837 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef,
838 NL80211_IFTYPE_ADHOC)) {
839 sdata_info(sdata,
840 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
841 ifibss->bssid,
842 params.chandef.chan->center_freq,
843 params.chandef.width,
844 params.chandef.center_freq1,
845 params.chandef.center_freq2);
846 goto disconnect;
847 }
848
849 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
850 ¶ms.chandef,
851 NL80211_IFTYPE_ADHOC);
852 if (err < 0)
853 goto disconnect;
854 if (err > 0 && !ifibss->userspace_handles_dfs) {
855 /* IBSS-DFS only allowed with a control program */
856 goto disconnect;
857 }
858
859 params.radar_required = err;
860
861 if (cfg80211_chandef_identical(¶ms.chandef,
862 &sdata->vif.bss_conf.chanreq.oper)) {
863 ibss_dbg(sdata,
864 "received csa with an identical chandef, ignoring\n");
865 return true;
866 }
867
868 /* all checks done, now perform the channel switch. */
869 ibss_dbg(sdata,
870 "received channel switch announcement to go to channel %d MHz\n",
871 params.chandef.chan->center_freq);
872
873 params.block_tx = !!csa_ie.mode;
874
875 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
876 ¶ms))
877 goto disconnect;
878
879 ieee80211_ibss_csa_mark_radar(sdata);
880
881 return true;
882disconnect:
883 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
884 wiphy_work_queue(sdata->local->hw.wiphy,
885 &ifibss->csa_connection_drop_work);
886
887 ieee80211_ibss_csa_mark_radar(sdata);
888
889 return true;
890}
891
892static void
893ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
894 struct ieee80211_mgmt *mgmt, size_t len,
895 struct ieee80211_rx_status *rx_status,
896 struct ieee802_11_elems *elems)
897{
898 int required_len;
899
900 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
901 return;
902
903 /* CSA is the only action we handle for now */
904 if (mgmt->u.action.u.measurement.action_code !=
905 WLAN_ACTION_SPCT_CHL_SWITCH)
906 return;
907
908 required_len = IEEE80211_MIN_ACTION_SIZE +
909 sizeof(mgmt->u.action.u.chan_switch);
910 if (len < required_len)
911 return;
912
913 if (!sdata->vif.bss_conf.csa_active)
914 ieee80211_ibss_process_chanswitch(sdata, elems, false);
915}
916
917static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
918 struct ieee80211_mgmt *mgmt,
919 size_t len)
920{
921 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
922
923 if (len < IEEE80211_DEAUTH_FRAME_LEN)
924 return;
925
926 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
927 ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason);
928 sta_info_destroy_addr(sdata, mgmt->sa);
929}
930
931static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
932 struct ieee80211_mgmt *mgmt,
933 size_t len)
934{
935 u16 auth_alg, auth_transaction;
936
937 lockdep_assert_wiphy(sdata->local->hw.wiphy);
938
939 if (len < 24 + 6)
940 return;
941
942 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
943 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
944
945 ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
946 ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n",
947 mgmt->bssid, auth_transaction);
948
949 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
950 return;
951
952 /*
953 * IEEE 802.11 standard does not require authentication in IBSS
954 * networks and most implementations do not seem to use it.
955 * However, try to reply to authentication attempts if someone
956 * has actually implemented this.
957 */
958 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
959 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
960}
961
962static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
963 struct ieee80211_mgmt *mgmt, size_t len,
964 struct ieee80211_rx_status *rx_status,
965 struct ieee802_11_elems *elems,
966 struct ieee80211_channel *channel)
967{
968 struct sta_info *sta;
969 enum nl80211_band band = rx_status->band;
970 struct ieee80211_local *local = sdata->local;
971 struct ieee80211_supported_band *sband;
972 bool rates_updated = false;
973 u32 supp_rates = 0;
974
975 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
976 return;
977
978 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
979 return;
980
981 sband = local->hw.wiphy->bands[band];
982 if (WARN_ON(!sband))
983 return;
984
985 rcu_read_lock();
986 sta = sta_info_get(sdata, mgmt->sa);
987
988 if (elems->supp_rates) {
989 supp_rates = ieee80211_sta_get_rates(sdata, elems,
990 band, NULL);
991 if (sta) {
992 u32 prev_rates;
993
994 prev_rates = sta->sta.deflink.supp_rates[band];
995
996 sta->sta.deflink.supp_rates[band] = supp_rates |
997 ieee80211_mandatory_rates(sband);
998 if (sta->sta.deflink.supp_rates[band] != prev_rates) {
999 ibss_dbg(sdata,
1000 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1001 sta->sta.addr, prev_rates,
1002 sta->sta.deflink.supp_rates[band]);
1003 rates_updated = true;
1004 }
1005 } else {
1006 rcu_read_unlock();
1007 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1008 mgmt->sa, supp_rates);
1009 }
1010 }
1011
1012 if (sta && !sta->sta.wme &&
1013 (elems->wmm_info || elems->s1g_capab) &&
1014 local->hw.queues >= IEEE80211_NUM_ACS) {
1015 sta->sta.wme = true;
1016 ieee80211_check_fast_xmit(sta);
1017 }
1018
1019 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1020 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1021 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1022 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1023 /* we both use HT */
1024 struct ieee80211_ht_cap htcap_ie;
1025 struct cfg80211_chan_def chandef;
1026 enum ieee80211_sta_rx_bandwidth bw = sta->sta.deflink.bandwidth;
1027
1028 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT);
1029 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef);
1030
1031 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1032 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1033 &htcap_ie,
1034 &sta->deflink);
1035
1036 if (elems->vht_operation && elems->vht_cap_elem &&
1037 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1038 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1039 /* we both use VHT */
1040 struct ieee80211_vht_cap cap_ie;
1041 struct ieee80211_sta_vht_cap cap = sta->sta.deflink.vht_cap;
1042 u32 vht_cap_info =
1043 le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
1044
1045 ieee80211_chandef_vht_oper(&local->hw, vht_cap_info,
1046 elems->vht_operation,
1047 elems->ht_operation,
1048 &chandef);
1049 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1050 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1051 &cap_ie, NULL,
1052 &sta->deflink);
1053 if (memcmp(&cap, &sta->sta.deflink.vht_cap, sizeof(cap)))
1054 rates_updated |= true;
1055 }
1056
1057 if (bw != sta->sta.deflink.bandwidth)
1058 rates_updated |= true;
1059
1060 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1061 &chandef))
1062 WARN_ON_ONCE(1);
1063 }
1064
1065 if (sta && rates_updated) {
1066 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1067 u8 rx_nss = sta->sta.deflink.rx_nss;
1068
1069 /* Force rx_nss recalculation */
1070 sta->sta.deflink.rx_nss = 0;
1071 rate_control_rate_init(&sta->deflink);
1072 if (sta->sta.deflink.rx_nss != rx_nss)
1073 changed |= IEEE80211_RC_NSS_CHANGED;
1074
1075 drv_link_sta_rc_update(local, sdata, &sta->sta.deflink,
1076 changed);
1077 }
1078
1079 rcu_read_unlock();
1080}
1081
1082static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1083 struct ieee80211_mgmt *mgmt, size_t len,
1084 struct ieee80211_rx_status *rx_status,
1085 struct ieee802_11_elems *elems)
1086{
1087 struct ieee80211_local *local = sdata->local;
1088 struct cfg80211_bss *cbss;
1089 struct ieee80211_bss *bss;
1090 struct ieee80211_channel *channel;
1091 u64 beacon_timestamp, rx_timestamp;
1092 u32 supp_rates = 0;
1093 enum nl80211_band band = rx_status->band;
1094
1095 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1096 if (!channel)
1097 return;
1098
1099 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1100
1101 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel);
1102 if (!bss)
1103 return;
1104
1105 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1106
1107 /* same for beacon and probe response */
1108 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1109
1110 /* check if we need to merge IBSS */
1111
1112 /* not an IBSS */
1113 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1114 goto put_bss;
1115
1116 /* different channel */
1117 if (sdata->u.ibss.fixed_channel &&
1118 sdata->u.ibss.chandef.chan != cbss->channel)
1119 goto put_bss;
1120
1121 /* different SSID */
1122 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1123 memcmp(elems->ssid, sdata->u.ibss.ssid,
1124 sdata->u.ibss.ssid_len))
1125 goto put_bss;
1126
1127 /* process channel switch */
1128 if (sdata->vif.bss_conf.csa_active ||
1129 ieee80211_ibss_process_chanswitch(sdata, elems, true))
1130 goto put_bss;
1131
1132 /* same BSSID */
1133 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1134 goto put_bss;
1135
1136 /* we use a fixed BSSID */
1137 if (sdata->u.ibss.fixed_bssid)
1138 goto put_bss;
1139
1140 if (ieee80211_have_rx_timestamp(rx_status)) {
1141 /* time when timestamp field was received */
1142 rx_timestamp =
1143 ieee80211_calculate_rx_timestamp(local, rx_status,
1144 len + FCS_LEN, 24);
1145 } else {
1146 /*
1147 * second best option: get current TSF
1148 * (will return -1 if not supported)
1149 */
1150 rx_timestamp = drv_get_tsf(local, sdata);
1151 }
1152
1153 ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n",
1154 mgmt->sa, mgmt->bssid,
1155 (unsigned long long)rx_timestamp);
1156 ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n",
1157 (unsigned long long)beacon_timestamp,
1158 (unsigned long long)(rx_timestamp - beacon_timestamp),
1159 jiffies);
1160
1161 if (beacon_timestamp > rx_timestamp) {
1162 ibss_dbg(sdata,
1163 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1164 mgmt->bssid);
1165 ieee80211_sta_join_ibss(sdata, bss);
1166 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1167 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1168 supp_rates);
1169 rcu_read_unlock();
1170 }
1171
1172 put_bss:
1173 ieee80211_rx_bss_put(local, bss);
1174}
1175
1176void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1177 const u8 *bssid, const u8 *addr,
1178 u32 supp_rates)
1179{
1180 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1181 struct ieee80211_local *local = sdata->local;
1182 struct sta_info *sta;
1183 struct ieee80211_chanctx_conf *chanctx_conf;
1184 struct ieee80211_supported_band *sband;
1185 int band;
1186
1187 /*
1188 * XXX: Consider removing the least recently used entry and
1189 * allow new one to be added.
1190 */
1191 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1192 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1193 sdata->name, addr);
1194 return;
1195 }
1196
1197 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1198 return;
1199
1200 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1201 return;
1202
1203 rcu_read_lock();
1204 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
1205 if (WARN_ON_ONCE(!chanctx_conf)) {
1206 rcu_read_unlock();
1207 return;
1208 }
1209 band = chanctx_conf->def.chan->band;
1210 rcu_read_unlock();
1211
1212 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1213 if (!sta)
1214 return;
1215
1216 /* make sure mandatory rates are always added */
1217 sband = local->hw.wiphy->bands[band];
1218 sta->sta.deflink.supp_rates[band] = supp_rates |
1219 ieee80211_mandatory_rates(sband);
1220
1221 spin_lock(&ifibss->incomplete_lock);
1222 list_add(&sta->list, &ifibss->incomplete_stations);
1223 spin_unlock(&ifibss->incomplete_lock);
1224 wiphy_work_queue(local->hw.wiphy, &sdata->work);
1225}
1226
1227static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1228{
1229 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1230 struct ieee80211_local *local = sdata->local;
1231 struct sta_info *sta, *tmp;
1232 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1233 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1234
1235 lockdep_assert_wiphy(local->hw.wiphy);
1236
1237 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1238 unsigned long last_active = ieee80211_sta_last_active(sta);
1239
1240 if (sdata != sta->sdata)
1241 continue;
1242
1243 if (time_is_before_jiffies(last_active + exp_time) ||
1244 (time_is_before_jiffies(last_active + exp_rsn) &&
1245 sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1246 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
1247
1248 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1249 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1250 "not authorized " : "", sta->sta.addr);
1251
1252 ieee80211_send_deauth_disassoc(sdata, sta->sta.addr,
1253 ifibss->bssid,
1254 IEEE80211_STYPE_DEAUTH,
1255 WLAN_REASON_DEAUTH_LEAVING,
1256 true, frame_buf);
1257 WARN_ON(__sta_info_destroy(sta));
1258 }
1259 }
1260}
1261
1262/*
1263 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1264 */
1265
1266static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1267{
1268 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1269
1270 lockdep_assert_wiphy(sdata->local->hw.wiphy);
1271
1272 mod_timer(&ifibss->timer,
1273 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1274
1275 ieee80211_ibss_sta_expire(sdata);
1276
1277 if (time_before(jiffies, ifibss->last_scan_completed +
1278 IEEE80211_IBSS_MERGE_INTERVAL))
1279 return;
1280
1281 if (ieee80211_sta_active_ibss(sdata))
1282 return;
1283
1284 if (ifibss->fixed_channel)
1285 return;
1286
1287 sdata_info(sdata,
1288 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1289
1290 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1291 NULL, 0);
1292}
1293
1294static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1295{
1296 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1297 u8 bssid[ETH_ALEN];
1298 u16 capability;
1299 int i;
1300
1301 lockdep_assert_wiphy(sdata->local->hw.wiphy);
1302
1303 if (ifibss->fixed_bssid) {
1304 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1305 } else {
1306 /* Generate random, not broadcast, locally administered BSSID. Mix in
1307 * own MAC address to make sure that devices that do not have proper
1308 * random number generator get different BSSID. */
1309 get_random_bytes(bssid, ETH_ALEN);
1310 for (i = 0; i < ETH_ALEN; i++)
1311 bssid[i] ^= sdata->vif.addr[i];
1312 bssid[0] &= ~0x01;
1313 bssid[0] |= 0x02;
1314 }
1315
1316 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1317
1318 capability = WLAN_CAPABILITY_IBSS;
1319
1320 if (ifibss->privacy)
1321 capability |= WLAN_CAPABILITY_PRIVACY;
1322
1323 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1324 &ifibss->chandef, ifibss->basic_rates,
1325 capability, 0, true);
1326}
1327
1328static unsigned int ibss_setup_channels(struct wiphy *wiphy,
1329 struct ieee80211_channel **channels,
1330 unsigned int channels_max,
1331 u32 center_freq, u32 width)
1332{
1333 struct ieee80211_channel *chan = NULL;
1334 unsigned int n_chan = 0;
1335 u32 start_freq, end_freq, freq;
1336
1337 if (width <= 20) {
1338 start_freq = center_freq;
1339 end_freq = center_freq;
1340 } else {
1341 start_freq = center_freq - width / 2 + 10;
1342 end_freq = center_freq + width / 2 - 10;
1343 }
1344
1345 for (freq = start_freq; freq <= end_freq; freq += 20) {
1346 chan = ieee80211_get_channel(wiphy, freq);
1347 if (!chan)
1348 continue;
1349 if (n_chan >= channels_max)
1350 return n_chan;
1351
1352 channels[n_chan] = chan;
1353 n_chan++;
1354 }
1355
1356 return n_chan;
1357}
1358
1359static unsigned int
1360ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1361 const struct cfg80211_chan_def *chandef,
1362 struct ieee80211_channel **channels,
1363 unsigned int channels_max)
1364{
1365 unsigned int n_chan = 0;
1366 u32 width, cf1, cf2 = 0;
1367
1368 switch (chandef->width) {
1369 case NL80211_CHAN_WIDTH_40:
1370 width = 40;
1371 break;
1372 case NL80211_CHAN_WIDTH_80P80:
1373 cf2 = chandef->center_freq2;
1374 fallthrough;
1375 case NL80211_CHAN_WIDTH_80:
1376 width = 80;
1377 break;
1378 case NL80211_CHAN_WIDTH_160:
1379 width = 160;
1380 break;
1381 default:
1382 width = 20;
1383 break;
1384 }
1385
1386 cf1 = chandef->center_freq1;
1387
1388 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1389
1390 if (cf2)
1391 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1392 channels_max - n_chan, cf2,
1393 width);
1394
1395 return n_chan;
1396}
1397
1398/*
1399 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1400 */
1401
1402static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1403{
1404 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1405 struct ieee80211_local *local = sdata->local;
1406 struct cfg80211_bss *cbss;
1407 struct ieee80211_channel *chan = NULL;
1408 const u8 *bssid = NULL;
1409 int active_ibss;
1410
1411 lockdep_assert_wiphy(sdata->local->hw.wiphy);
1412
1413 active_ibss = ieee80211_sta_active_ibss(sdata);
1414 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1415
1416 if (active_ibss)
1417 return;
1418
1419 if (ifibss->fixed_bssid)
1420 bssid = ifibss->bssid;
1421 if (ifibss->fixed_channel)
1422 chan = ifibss->chandef.chan;
1423 if (!is_zero_ether_addr(ifibss->bssid))
1424 bssid = ifibss->bssid;
1425 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1426 ifibss->ssid, ifibss->ssid_len,
1427 IEEE80211_BSS_TYPE_IBSS,
1428 IEEE80211_PRIVACY(ifibss->privacy));
1429
1430 if (cbss) {
1431 struct ieee80211_bss *bss;
1432
1433 bss = (void *)cbss->priv;
1434 ibss_dbg(sdata,
1435 "sta_find_ibss: selected %pM current %pM\n",
1436 cbss->bssid, ifibss->bssid);
1437 sdata_info(sdata,
1438 "Selected IBSS BSSID %pM based on configured SSID\n",
1439 cbss->bssid);
1440
1441 ieee80211_sta_join_ibss(sdata, bss);
1442 ieee80211_rx_bss_put(local, bss);
1443 return;
1444 }
1445
1446 /* if a fixed bssid and a fixed freq have been provided create the IBSS
1447 * directly and do not waste time scanning
1448 */
1449 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1450 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1451 bssid);
1452 ieee80211_sta_create_ibss(sdata);
1453 return;
1454 }
1455
1456
1457 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1458
1459 /* Selected IBSS not found in current scan results - try to scan */
1460 if (time_after(jiffies, ifibss->last_scan_completed +
1461 IEEE80211_SCAN_INTERVAL)) {
1462 struct ieee80211_channel *channels[8];
1463 unsigned int num;
1464
1465 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1466
1467 if (ifibss->fixed_channel) {
1468 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1469 &ifibss->chandef,
1470 channels,
1471 ARRAY_SIZE(channels));
1472 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1473 ifibss->ssid_len, channels,
1474 num);
1475 } else {
1476 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1477 ifibss->ssid_len, NULL, 0);
1478 }
1479 } else {
1480 int interval = IEEE80211_SCAN_INTERVAL;
1481
1482 if (time_after(jiffies, ifibss->ibss_join_req +
1483 IEEE80211_IBSS_JOIN_TIMEOUT))
1484 ieee80211_sta_create_ibss(sdata);
1485
1486 mod_timer(&ifibss->timer,
1487 round_jiffies(jiffies + interval));
1488 }
1489}
1490
1491static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1492 struct sk_buff *req)
1493{
1494 struct ieee80211_mgmt *mgmt = (void *)req->data;
1495 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1496 struct ieee80211_local *local = sdata->local;
1497 int tx_last_beacon, len = req->len;
1498 struct sk_buff *skb;
1499 struct beacon_data *presp;
1500 u8 *pos, *end;
1501
1502 lockdep_assert_wiphy(sdata->local->hw.wiphy);
1503
1504 presp = sdata_dereference(ifibss->presp, sdata);
1505
1506 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1507 len < 24 + 2 || !presp)
1508 return;
1509
1510 tx_last_beacon = drv_tx_last_beacon(local);
1511
1512 ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
1513 ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n",
1514 mgmt->bssid, tx_last_beacon);
1515
1516 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1517 return;
1518
1519 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1520 !is_broadcast_ether_addr(mgmt->bssid))
1521 return;
1522
1523 end = ((u8 *) mgmt) + len;
1524 pos = mgmt->u.probe_req.variable;
1525 if (pos[0] != WLAN_EID_SSID ||
1526 pos + 2 + pos[1] > end) {
1527 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1528 mgmt->sa);
1529 return;
1530 }
1531 if (pos[1] != 0 &&
1532 (pos[1] != ifibss->ssid_len ||
1533 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1534 /* Ignore ProbeReq for foreign SSID */
1535 return;
1536 }
1537
1538 /* Reply with ProbeResp */
1539 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1540 if (!skb)
1541 return;
1542
1543 skb_reserve(skb, local->tx_headroom);
1544 skb_put_data(skb, presp->head, presp->head_len);
1545
1546 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1547 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1548 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1549
1550 /* avoid excessive retries for probe request to wildcard SSIDs */
1551 if (pos[1] == 0)
1552 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1553
1554 ieee80211_tx_skb(sdata, skb);
1555}
1556
1557static
1558void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1559 struct ieee80211_mgmt *mgmt, size_t len,
1560 struct ieee80211_rx_status *rx_status)
1561{
1562 size_t baselen;
1563 struct ieee802_11_elems *elems;
1564
1565 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1566 offsetof(typeof(mgmt->u.beacon), variable));
1567
1568 /*
1569 * either beacon or probe_resp but the variable field is at the
1570 * same offset
1571 */
1572 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1573 if (baselen > len)
1574 return;
1575
1576 elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable,
1577 len - baselen, false, NULL);
1578
1579 if (elems) {
1580 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, elems);
1581 kfree(elems);
1582 }
1583}
1584
1585void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1586 struct sk_buff *skb)
1587{
1588 struct ieee80211_rx_status *rx_status;
1589 struct ieee80211_mgmt *mgmt;
1590 u16 fc;
1591 struct ieee802_11_elems *elems;
1592 int ies_len;
1593
1594 rx_status = IEEE80211_SKB_RXCB(skb);
1595 mgmt = (struct ieee80211_mgmt *) skb->data;
1596 fc = le16_to_cpu(mgmt->frame_control);
1597
1598 if (!sdata->u.ibss.ssid_len)
1599 return; /* not ready to merge yet */
1600
1601 switch (fc & IEEE80211_FCTL_STYPE) {
1602 case IEEE80211_STYPE_PROBE_REQ:
1603 ieee80211_rx_mgmt_probe_req(sdata, skb);
1604 break;
1605 case IEEE80211_STYPE_PROBE_RESP:
1606 case IEEE80211_STYPE_BEACON:
1607 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1608 rx_status);
1609 break;
1610 case IEEE80211_STYPE_AUTH:
1611 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1612 break;
1613 case IEEE80211_STYPE_DEAUTH:
1614 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1615 break;
1616 case IEEE80211_STYPE_ACTION:
1617 switch (mgmt->u.action.category) {
1618 case WLAN_CATEGORY_SPECTRUM_MGMT:
1619 ies_len = skb->len -
1620 offsetof(struct ieee80211_mgmt,
1621 u.action.u.chan_switch.variable);
1622
1623 if (ies_len < 0)
1624 break;
1625
1626 elems = ieee802_11_parse_elems(
1627 mgmt->u.action.u.chan_switch.variable,
1628 ies_len, true, NULL);
1629
1630 if (elems && !elems->parse_error)
1631 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt,
1632 skb->len,
1633 rx_status,
1634 elems);
1635 kfree(elems);
1636 break;
1637 }
1638 }
1639}
1640
1641void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1642{
1643 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1644 struct sta_info *sta;
1645
1646 /*
1647 * Work could be scheduled after scan or similar
1648 * when we aren't even joined (or trying) with a
1649 * network.
1650 */
1651 if (!ifibss->ssid_len)
1652 return;
1653
1654 spin_lock_bh(&ifibss->incomplete_lock);
1655 while (!list_empty(&ifibss->incomplete_stations)) {
1656 sta = list_first_entry(&ifibss->incomplete_stations,
1657 struct sta_info, list);
1658 list_del(&sta->list);
1659 spin_unlock_bh(&ifibss->incomplete_lock);
1660
1661 ieee80211_ibss_finish_sta(sta);
1662 rcu_read_unlock();
1663 spin_lock_bh(&ifibss->incomplete_lock);
1664 }
1665 spin_unlock_bh(&ifibss->incomplete_lock);
1666
1667 switch (ifibss->state) {
1668 case IEEE80211_IBSS_MLME_SEARCH:
1669 ieee80211_sta_find_ibss(sdata);
1670 break;
1671 case IEEE80211_IBSS_MLME_JOINED:
1672 ieee80211_sta_merge_ibss(sdata);
1673 break;
1674 default:
1675 WARN_ON(1);
1676 break;
1677 }
1678}
1679
1680static void ieee80211_ibss_timer(struct timer_list *t)
1681{
1682 struct ieee80211_sub_if_data *sdata =
1683 from_timer(sdata, t, u.ibss.timer);
1684
1685 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
1686}
1687
1688void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1689{
1690 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1691
1692 timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0);
1693 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1694 spin_lock_init(&ifibss->incomplete_lock);
1695 wiphy_work_init(&ifibss->csa_connection_drop_work,
1696 ieee80211_csa_connection_drop_work);
1697}
1698
1699/* scan finished notification */
1700void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1701{
1702 struct ieee80211_sub_if_data *sdata;
1703
1704 lockdep_assert_wiphy(local->hw.wiphy);
1705
1706 list_for_each_entry(sdata, &local->interfaces, list) {
1707 if (!ieee80211_sdata_running(sdata))
1708 continue;
1709 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1710 continue;
1711 sdata->u.ibss.last_scan_completed = jiffies;
1712 }
1713}
1714
1715int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1716 struct cfg80211_ibss_params *params)
1717{
1718 u64 changed = 0;
1719 u32 rate_flags;
1720 struct ieee80211_supported_band *sband;
1721 enum ieee80211_chanctx_mode chanmode;
1722 struct ieee80211_local *local = sdata->local;
1723 int radar_detect_width = 0;
1724 int i;
1725 int ret;
1726
1727 lockdep_assert_wiphy(local->hw.wiphy);
1728
1729 if (params->chandef.chan->freq_offset) {
1730 /* this may work, but is untested */
1731 return -EOPNOTSUPP;
1732 }
1733
1734 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1735 ¶ms->chandef,
1736 sdata->wdev.iftype);
1737 if (ret < 0)
1738 return ret;
1739
1740 if (ret > 0) {
1741 if (!params->userspace_handles_dfs)
1742 return -EINVAL;
1743 radar_detect_width = BIT(params->chandef.width);
1744 }
1745
1746 chanmode = (params->channel_fixed && !ret) ?
1747 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1748
1749 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode,
1750 radar_detect_width, -1);
1751 if (ret < 0)
1752 return ret;
1753
1754 if (params->bssid) {
1755 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1756 sdata->u.ibss.fixed_bssid = true;
1757 } else
1758 sdata->u.ibss.fixed_bssid = false;
1759
1760 sdata->u.ibss.privacy = params->privacy;
1761 sdata->u.ibss.control_port = params->control_port;
1762 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1763 sdata->u.ibss.basic_rates = params->basic_rates;
1764 sdata->u.ibss.last_scan_completed = jiffies;
1765
1766 /* fix basic_rates if channel does not support these rates */
1767 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef);
1768 sband = local->hw.wiphy->bands[params->chandef.chan->band];
1769 for (i = 0; i < sband->n_bitrates; i++) {
1770 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1771 sdata->u.ibss.basic_rates &= ~BIT(i);
1772 }
1773 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1774 sizeof(params->mcast_rate));
1775
1776 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1777
1778 sdata->u.ibss.chandef = params->chandef;
1779 sdata->u.ibss.fixed_channel = params->channel_fixed;
1780
1781 if (params->ie) {
1782 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1783 GFP_KERNEL);
1784 if (sdata->u.ibss.ie)
1785 sdata->u.ibss.ie_len = params->ie_len;
1786 }
1787
1788 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1789 sdata->u.ibss.ibss_join_req = jiffies;
1790
1791 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1792 sdata->u.ibss.ssid_len = params->ssid_len;
1793
1794 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa,
1795 sizeof(sdata->u.ibss.ht_capa));
1796 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask,
1797 sizeof(sdata->u.ibss.ht_capa_mask));
1798
1799 /*
1800 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1801 * reserved, but an HT STA shall protect HT transmissions as though
1802 * the HT Protection field were set to non-HT mixed mode.
1803 *
1804 * In an IBSS, the RIFS Mode field of the HT Operation element is
1805 * also reserved, but an HT STA shall operate as though this field
1806 * were set to 1.
1807 */
1808
1809 sdata->vif.bss_conf.ht_operation_mode |=
1810 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1811 | IEEE80211_HT_PARAM_RIFS_MODE;
1812
1813 changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE;
1814 ieee80211_link_info_change_notify(sdata, &sdata->deflink, changed);
1815
1816 sdata->deflink.smps_mode = IEEE80211_SMPS_OFF;
1817 sdata->deflink.needed_rx_chains = local->rx_chains;
1818 sdata->control_port_over_nl80211 = params->control_port_over_nl80211;
1819
1820 wiphy_work_queue(local->hw.wiphy, &sdata->work);
1821
1822 return 0;
1823}
1824
1825int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1826{
1827 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1828
1829 ieee80211_ibss_disconnect(sdata);
1830 ifibss->ssid_len = 0;
1831 eth_zero_addr(ifibss->bssid);
1832
1833 /* remove beacon */
1834 kfree(sdata->u.ibss.ie);
1835 sdata->u.ibss.ie = NULL;
1836 sdata->u.ibss.ie_len = 0;
1837
1838 /* on the next join, re-program HT parameters */
1839 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1840 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1841
1842 synchronize_rcu();
1843
1844 skb_queue_purge(&sdata->skb_queue);
1845
1846 del_timer_sync(&sdata->u.ibss.timer);
1847
1848 return 0;
1849}