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of: MSI: Simplify irqdomain lookup
[linux/fpc-iii.git] / net / mac80211 / ibss.c
blob337bb5d7800384b8acd52664951be429668e3f3c
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 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 */
15
16 #include <linux/delay.h>
17 #include <linux/slab.h>
18 #include <linux/if_ether.h>
19 #include <linux/skbuff.h>
20 #include <linux/if_arp.h>
21 #include <linux/etherdevice.h>
22 #include <linux/rtnetlink.h>
23 #include <net/mac80211.h>
24
25 #include "ieee80211_i.h"
26 #include "driver-ops.h"
27 #include "rate.h"
28
29 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
30 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
31
32 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
33 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
34 #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ)
35
36 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
37
38 static struct beacon_data *
39 ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata,
40 const int beacon_int, const u32 basic_rates,
41 const u16 capability, u64 tsf,
42 struct cfg80211_chan_def *chandef,
43 bool *have_higher_than_11mbit,
44 struct cfg80211_csa_settings *csa_settings)
45 {
46 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
47 struct ieee80211_local *local = sdata->local;
48 int rates_n = 0, i, ri;
49 struct ieee80211_mgmt *mgmt;
50 u8 *pos;
51 struct ieee80211_supported_band *sband;
52 u32 rate_flags, rates = 0, rates_added = 0;
53 struct beacon_data *presp;
54 int frame_len;
55 int shift;
56
57 /* Build IBSS probe response */
58 frame_len = sizeof(struct ieee80211_hdr_3addr) +
59 12 /* struct ieee80211_mgmt.u.beacon */ +
60 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
61 2 + 8 /* max Supported Rates */ +
62 3 /* max DS params */ +
63 4 /* IBSS params */ +
64 5 /* Channel Switch Announcement */ +
65 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
66 2 + sizeof(struct ieee80211_ht_cap) +
67 2 + sizeof(struct ieee80211_ht_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 shift = ieee80211_chandef_get_shift(chandef);
95 rates_n = 0;
96 if (have_higher_than_11mbit)
97 *have_higher_than_11mbit = false;
98
99 for (i = 0; i < sband->n_bitrates; i++) {
100 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
101 continue;
102 if (sband->bitrates[i].bitrate > 110 &&
103 have_higher_than_11mbit)
104 *have_higher_than_11mbit = true;
105
106 rates |= BIT(i);
107 rates_n++;
108 }
109
110 *pos++ = WLAN_EID_SUPP_RATES;
111 *pos++ = min_t(int, 8, rates_n);
112 for (ri = 0; ri < sband->n_bitrates; ri++) {
113 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
114 5 * (1 << shift));
115 u8 basic = 0;
116 if (!(rates & BIT(ri)))
117 continue;
118
119 if (basic_rates & BIT(ri))
120 basic = 0x80;
121 *pos++ = basic | (u8) rate;
122 if (++rates_added == 8) {
123 ri++; /* continue at next rate for EXT_SUPP_RATES */
124 break;
125 }
126 }
127
128 if (sband->band == IEEE80211_BAND_2GHZ) {
129 *pos++ = WLAN_EID_DS_PARAMS;
130 *pos++ = 1;
131 *pos++ = ieee80211_frequency_to_channel(
132 chandef->chan->center_freq);
133 }
134
135 *pos++ = WLAN_EID_IBSS_PARAMS;
136 *pos++ = 2;
137 /* FIX: set ATIM window based on scan results */
138 *pos++ = 0;
139 *pos++ = 0;
140
141 if (csa_settings) {
142 *pos++ = WLAN_EID_CHANNEL_SWITCH;
143 *pos++ = 3;
144 *pos++ = csa_settings->block_tx ? 1 : 0;
145 *pos++ = ieee80211_frequency_to_channel(
146 csa_settings->chandef.chan->center_freq);
147 presp->csa_counter_offsets[0] = (pos - presp->head);
148 *pos++ = csa_settings->count;
149 presp->csa_current_counter = csa_settings->count;
150 }
151
152 /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
153 if (rates_n > 8) {
154 *pos++ = WLAN_EID_EXT_SUPP_RATES;
155 *pos++ = rates_n - 8;
156 for (; ri < sband->n_bitrates; ri++) {
157 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
158 5 * (1 << shift));
159 u8 basic = 0;
160 if (!(rates & BIT(ri)))
161 continue;
162
163 if (basic_rates & BIT(ri))
164 basic = 0x80;
165 *pos++ = basic | (u8) rate;
166 }
167 }
168
169 if (ifibss->ie_len) {
170 memcpy(pos, ifibss->ie, ifibss->ie_len);
171 pos += ifibss->ie_len;
172 }
173
174 /* add HT capability and information IEs */
175 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
176 chandef->width != NL80211_CHAN_WIDTH_5 &&
177 chandef->width != NL80211_CHAN_WIDTH_10 &&
178 sband->ht_cap.ht_supported) {
179 struct ieee80211_sta_ht_cap ht_cap;
180
181 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
182 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
183
184 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
185 /*
186 * Note: According to 802.11n-2009 9.13.3.1, HT Protection
187 * field and RIFS Mode are reserved in IBSS mode, therefore
188 * keep them at 0
189 */
190 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
191 chandef, 0, false);
192
193 /* add VHT capability and information IEs */
194 if (chandef->width != NL80211_CHAN_WIDTH_20 &&
195 chandef->width != NL80211_CHAN_WIDTH_40 &&
196 sband->vht_cap.vht_supported) {
197 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
198 sband->vht_cap.cap);
199 pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap,
200 chandef);
201 }
202 }
203
204 if (local->hw.queues >= IEEE80211_NUM_ACS)
205 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */
206
207 presp->head_len = pos - presp->head;
208 if (WARN_ON(presp->head_len > frame_len))
209 goto error;
210
211 return presp;
212 error:
213 kfree(presp);
214 return NULL;
215 }
216
217 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
218 const u8 *bssid, const int beacon_int,
219 struct cfg80211_chan_def *req_chandef,
220 const u32 basic_rates,
221 const u16 capability, u64 tsf,
222 bool creator)
223 {
224 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
225 struct ieee80211_local *local = sdata->local;
226 struct ieee80211_mgmt *mgmt;
227 struct cfg80211_bss *bss;
228 u32 bss_change;
229 struct cfg80211_chan_def chandef;
230 struct ieee80211_channel *chan;
231 struct beacon_data *presp;
232 struct cfg80211_inform_bss bss_meta = {};
233 bool have_higher_than_11mbit;
234 bool radar_required;
235 int err;
236
237 sdata_assert_lock(sdata);
238
239 /* Reset own TSF to allow time synchronization work. */
240 drv_reset_tsf(local, sdata);
241
242 if (!ether_addr_equal(ifibss->bssid, bssid))
243 sta_info_flush(sdata);
244
245 /* if merging, indicate to driver that we leave the old IBSS */
246 if (sdata->vif.bss_conf.ibss_joined) {
247 sdata->vif.bss_conf.ibss_joined = false;
248 sdata->vif.bss_conf.ibss_creator = false;
249 sdata->vif.bss_conf.enable_beacon = false;
250 netif_carrier_off(sdata->dev);
251 ieee80211_bss_info_change_notify(sdata,
252 BSS_CHANGED_IBSS |
253 BSS_CHANGED_BEACON_ENABLED);
254 drv_leave_ibss(local, sdata);
255 }
256
257 presp = rcu_dereference_protected(ifibss->presp,
258 lockdep_is_held(&sdata->wdev.mtx));
259 RCU_INIT_POINTER(ifibss->presp, NULL);
260 if (presp)
261 kfree_rcu(presp, rcu_head);
262
263 /* make a copy of the chandef, it could be modified below. */
264 chandef = *req_chandef;
265 chan = chandef.chan;
266 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
267 NL80211_IFTYPE_ADHOC)) {
268 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
269 chandef.width == NL80211_CHAN_WIDTH_10 ||
270 chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
271 chandef.width == NL80211_CHAN_WIDTH_20) {
272 sdata_info(sdata,
273 "Failed to join IBSS, beacons forbidden\n");
274 return;
275 }
276 chandef.width = NL80211_CHAN_WIDTH_20;
277 chandef.center_freq1 = chan->center_freq;
278 /* check again for downgraded chandef */
279 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
280 NL80211_IFTYPE_ADHOC)) {
281 sdata_info(sdata,
282 "Failed to join IBSS, beacons forbidden\n");
283 return;
284 }
285 }
286
287 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
288 &chandef, NL80211_IFTYPE_ADHOC);
289 if (err < 0) {
290 sdata_info(sdata,
291 "Failed to join IBSS, invalid chandef\n");
292 return;
293 }
294 if (err > 0 && !ifibss->userspace_handles_dfs) {
295 sdata_info(sdata,
296 "Failed to join IBSS, DFS channel without control program\n");
297 return;
298 }
299
300 radar_required = err;
301
302 mutex_lock(&local->mtx);
303 if (ieee80211_vif_use_channel(sdata, &chandef,
304 ifibss->fixed_channel ?
305 IEEE80211_CHANCTX_SHARED :
306 IEEE80211_CHANCTX_EXCLUSIVE)) {
307 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
308 mutex_unlock(&local->mtx);
309 return;
310 }
311 sdata->radar_required = radar_required;
312 mutex_unlock(&local->mtx);
313
314 memcpy(ifibss->bssid, bssid, ETH_ALEN);
315
316 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
317 capability, tsf, &chandef,
318 &have_higher_than_11mbit, NULL);
319 if (!presp)
320 return;
321
322 rcu_assign_pointer(ifibss->presp, presp);
323 mgmt = (void *)presp->head;
324
325 sdata->vif.bss_conf.enable_beacon = true;
326 sdata->vif.bss_conf.beacon_int = beacon_int;
327 sdata->vif.bss_conf.basic_rates = basic_rates;
328 sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
329 memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
330 bss_change = BSS_CHANGED_BEACON_INT;
331 bss_change |= ieee80211_reset_erp_info(sdata);
332 bss_change |= BSS_CHANGED_BSSID;
333 bss_change |= BSS_CHANGED_BEACON;
334 bss_change |= BSS_CHANGED_BEACON_ENABLED;
335 bss_change |= BSS_CHANGED_BASIC_RATES;
336 bss_change |= BSS_CHANGED_HT;
337 bss_change |= BSS_CHANGED_IBSS;
338 bss_change |= BSS_CHANGED_SSID;
339
340 /*
341 * In 5 GHz/802.11a, we can always use short slot time.
342 * (IEEE 802.11-2012 18.3.8.7)
343 *
344 * In 2.4GHz, we must always use long slots in IBSS for compatibility
345 * reasons.
346 * (IEEE 802.11-2012 19.4.5)
347 *
348 * HT follows these specifications (IEEE 802.11-2012 20.3.18)
349 */
350 sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ;
351 bss_change |= BSS_CHANGED_ERP_SLOT;
352
353 /* cf. IEEE 802.11 9.2.12 */
354 if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit)
355 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
356 else
357 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
358
359 ieee80211_set_wmm_default(sdata, true, false);
360
361 sdata->vif.bss_conf.ibss_joined = true;
362 sdata->vif.bss_conf.ibss_creator = creator;
363
364 err = drv_join_ibss(local, sdata);
365 if (err) {
366 sdata->vif.bss_conf.ibss_joined = false;
367 sdata->vif.bss_conf.ibss_creator = false;
368 sdata->vif.bss_conf.enable_beacon = false;
369 sdata->vif.bss_conf.ssid_len = 0;
370 RCU_INIT_POINTER(ifibss->presp, NULL);
371 kfree_rcu(presp, rcu_head);
372 mutex_lock(&local->mtx);
373 ieee80211_vif_release_channel(sdata);
374 mutex_unlock(&local->mtx);
375 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
376 err);
377 return;
378 }
379
380 ieee80211_bss_info_change_notify(sdata, bss_change);
381
382 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
383 mod_timer(&ifibss->timer,
384 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
385
386 bss_meta.chan = chan;
387 bss_meta.scan_width = cfg80211_chandef_to_scan_width(&chandef);
388 bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt,
389 presp->head_len, GFP_KERNEL);
390
391 cfg80211_put_bss(local->hw.wiphy, bss);
392 netif_carrier_on(sdata->dev);
393 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
394 }
395
396 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
397 struct ieee80211_bss *bss)
398 {
399 struct cfg80211_bss *cbss =
400 container_of((void *)bss, struct cfg80211_bss, priv);
401 struct ieee80211_supported_band *sband;
402 struct cfg80211_chan_def chandef;
403 u32 basic_rates;
404 int i, j;
405 u16 beacon_int = cbss->beacon_interval;
406 const struct cfg80211_bss_ies *ies;
407 enum nl80211_channel_type chan_type;
408 u64 tsf;
409 u32 rate_flags;
410 int shift;
411
412 sdata_assert_lock(sdata);
413
414 if (beacon_int < 10)
415 beacon_int = 10;
416
417 switch (sdata->u.ibss.chandef.width) {
418 case NL80211_CHAN_WIDTH_20_NOHT:
419 case NL80211_CHAN_WIDTH_20:
420 case NL80211_CHAN_WIDTH_40:
421 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
422 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
423 break;
424 case NL80211_CHAN_WIDTH_5:
425 case NL80211_CHAN_WIDTH_10:
426 cfg80211_chandef_create(&chandef, cbss->channel,
427 NL80211_CHAN_WIDTH_20_NOHT);
428 chandef.width = sdata->u.ibss.chandef.width;
429 break;
430 case NL80211_CHAN_WIDTH_80:
431 case NL80211_CHAN_WIDTH_160:
432 chandef = sdata->u.ibss.chandef;
433 chandef.chan = cbss->channel;
434 break;
435 default:
436 /* fall back to 20 MHz for unsupported modes */
437 cfg80211_chandef_create(&chandef, cbss->channel,
438 NL80211_CHAN_WIDTH_20_NOHT);
439 break;
440 }
441
442 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
443 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
444 shift = ieee80211_vif_get_shift(&sdata->vif);
445
446 basic_rates = 0;
447
448 for (i = 0; i < bss->supp_rates_len; i++) {
449 int rate = bss->supp_rates[i] & 0x7f;
450 bool is_basic = !!(bss->supp_rates[i] & 0x80);
451
452 for (j = 0; j < sband->n_bitrates; j++) {
453 int brate;
454 if ((rate_flags & sband->bitrates[j].flags)
455 != rate_flags)
456 continue;
457
458 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
459 5 * (1 << shift));
460 if (brate == rate) {
461 if (is_basic)
462 basic_rates |= BIT(j);
463 break;
464 }
465 }
466 }
467
468 rcu_read_lock();
469 ies = rcu_dereference(cbss->ies);
470 tsf = ies->tsf;
471 rcu_read_unlock();
472
473 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
474 beacon_int,
475 &chandef,
476 basic_rates,
477 cbss->capability,
478 tsf, false);
479 }
480
481 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
482 struct cfg80211_csa_settings *csa_settings)
483 {
484 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
485 struct beacon_data *presp, *old_presp;
486 struct cfg80211_bss *cbss;
487 const struct cfg80211_bss_ies *ies;
488 u16 capability = 0;
489 u64 tsf;
490 int ret = 0;
491
492 sdata_assert_lock(sdata);
493
494 if (ifibss->privacy)
495 capability = WLAN_CAPABILITY_PRIVACY;
496
497 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
498 ifibss->bssid, ifibss->ssid,
499 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS,
500 IEEE80211_PRIVACY(ifibss->privacy));
501
502 if (WARN_ON(!cbss)) {
503 ret = -EINVAL;
504 goto out;
505 }
506
507 rcu_read_lock();
508 ies = rcu_dereference(cbss->ies);
509 tsf = ies->tsf;
510 rcu_read_unlock();
511 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
512
513 old_presp = rcu_dereference_protected(ifibss->presp,
514 lockdep_is_held(&sdata->wdev.mtx));
515
516 presp = ieee80211_ibss_build_presp(sdata,
517 sdata->vif.bss_conf.beacon_int,
518 sdata->vif.bss_conf.basic_rates,
519 capability, tsf, &ifibss->chandef,
520 NULL, csa_settings);
521 if (!presp) {
522 ret = -ENOMEM;
523 goto out;
524 }
525
526 rcu_assign_pointer(ifibss->presp, presp);
527 if (old_presp)
528 kfree_rcu(old_presp, rcu_head);
529
530 return BSS_CHANGED_BEACON;
531 out:
532 return ret;
533 }
534
535 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
536 {
537 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
538 struct cfg80211_bss *cbss;
539 int err, changed = 0;
540
541 sdata_assert_lock(sdata);
542
543 /* update cfg80211 bss information with the new channel */
544 if (!is_zero_ether_addr(ifibss->bssid)) {
545 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
546 ifibss->chandef.chan,
547 ifibss->bssid, ifibss->ssid,
548 ifibss->ssid_len,
549 IEEE80211_BSS_TYPE_IBSS,
550 IEEE80211_PRIVACY(ifibss->privacy));
551 /* XXX: should not really modify cfg80211 data */
552 if (cbss) {
553 cbss->channel = sdata->csa_chandef.chan;
554 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
555 }
556 }
557
558 ifibss->chandef = sdata->csa_chandef;
559
560 /* generate the beacon */
561 err = ieee80211_ibss_csa_beacon(sdata, NULL);
562 if (err < 0)
563 return err;
564
565 changed |= err;
566
567 return changed;
568 }
569
570 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
571 {
572 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
573
574 cancel_work_sync(&ifibss->csa_connection_drop_work);
575 }
576
577 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
578 __acquires(RCU)
579 {
580 struct ieee80211_sub_if_data *sdata = sta->sdata;
581 u8 addr[ETH_ALEN];
582
583 memcpy(addr, sta->sta.addr, ETH_ALEN);
584
585 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
586
587 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
588 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
589 /* authorize the station only if the network is not RSN protected. If
590 * not wait for the userspace to authorize it */
591 if (!sta->sdata->u.ibss.control_port)
592 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
593
594 rate_control_rate_init(sta);
595
596 /* If it fails, maybe we raced another insertion? */
597 if (sta_info_insert_rcu(sta))
598 return sta_info_get(sdata, addr);
599 return sta;
600 }
601
602 static struct sta_info *
603 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
604 const u8 *addr, u32 supp_rates)
605 __acquires(RCU)
606 {
607 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
608 struct ieee80211_local *local = sdata->local;
609 struct sta_info *sta;
610 struct ieee80211_chanctx_conf *chanctx_conf;
611 struct ieee80211_supported_band *sband;
612 enum nl80211_bss_scan_width scan_width;
613 int band;
614
615 /*
616 * XXX: Consider removing the least recently used entry and
617 * allow new one to be added.
618 */
619 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
620 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
621 sdata->name, addr);
622 rcu_read_lock();
623 return NULL;
624 }
625
626 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
627 rcu_read_lock();
628 return NULL;
629 }
630
631 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
632 rcu_read_lock();
633 return NULL;
634 }
635
636 rcu_read_lock();
637 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
638 if (WARN_ON_ONCE(!chanctx_conf))
639 return NULL;
640 band = chanctx_conf->def.chan->band;
641 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
642 rcu_read_unlock();
643
644 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
645 if (!sta) {
646 rcu_read_lock();
647 return NULL;
648 }
649
650 sta->rx_stats.last_rx = jiffies;
651
652 /* make sure mandatory rates are always added */
653 sband = local->hw.wiphy->bands[band];
654 sta->sta.supp_rates[band] = supp_rates |
655 ieee80211_mandatory_rates(sband, scan_width);
656
657 return ieee80211_ibss_finish_sta(sta);
658 }
659
660 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
661 {
662 struct ieee80211_local *local = sdata->local;
663 int active = 0;
664 struct sta_info *sta;
665
666 sdata_assert_lock(sdata);
667
668 rcu_read_lock();
669
670 list_for_each_entry_rcu(sta, &local->sta_list, list) {
671 if (sta->sdata == sdata &&
672 time_after(sta->rx_stats.last_rx +
673 IEEE80211_IBSS_MERGE_INTERVAL,
674 jiffies)) {
675 active++;
676 break;
677 }
678 }
679
680 rcu_read_unlock();
681
682 return active;
683 }
684
685 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
686 {
687 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
688 struct ieee80211_local *local = sdata->local;
689 struct cfg80211_bss *cbss;
690 struct beacon_data *presp;
691 struct sta_info *sta;
692
693 if (!is_zero_ether_addr(ifibss->bssid)) {
694 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
695 ifibss->bssid, ifibss->ssid,
696 ifibss->ssid_len,
697 IEEE80211_BSS_TYPE_IBSS,
698 IEEE80211_PRIVACY(ifibss->privacy));
699
700 if (cbss) {
701 cfg80211_unlink_bss(local->hw.wiphy, cbss);
702 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
703 }
704 }
705
706 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
707
708 sta_info_flush(sdata);
709
710 spin_lock_bh(&ifibss->incomplete_lock);
711 while (!list_empty(&ifibss->incomplete_stations)) {
712 sta = list_first_entry(&ifibss->incomplete_stations,
713 struct sta_info, list);
714 list_del(&sta->list);
715 spin_unlock_bh(&ifibss->incomplete_lock);
716
717 sta_info_free(local, sta);
718 spin_lock_bh(&ifibss->incomplete_lock);
719 }
720 spin_unlock_bh(&ifibss->incomplete_lock);
721
722 netif_carrier_off(sdata->dev);
723
724 sdata->vif.bss_conf.ibss_joined = false;
725 sdata->vif.bss_conf.ibss_creator = false;
726 sdata->vif.bss_conf.enable_beacon = false;
727 sdata->vif.bss_conf.ssid_len = 0;
728
729 /* remove beacon */
730 presp = rcu_dereference_protected(ifibss->presp,
731 lockdep_is_held(&sdata->wdev.mtx));
732 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
733 if (presp)
734 kfree_rcu(presp, rcu_head);
735
736 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
737 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
738 BSS_CHANGED_IBSS);
739 drv_leave_ibss(local, sdata);
740 mutex_lock(&local->mtx);
741 ieee80211_vif_release_channel(sdata);
742 mutex_unlock(&local->mtx);
743 }
744
745 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
746 {
747 struct ieee80211_sub_if_data *sdata =
748 container_of(work, struct ieee80211_sub_if_data,
749 u.ibss.csa_connection_drop_work);
750
751 sdata_lock(sdata);
752
753 ieee80211_ibss_disconnect(sdata);
754 synchronize_rcu();
755 skb_queue_purge(&sdata->skb_queue);
756
757 /* trigger a scan to find another IBSS network to join */
758 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
759
760 sdata_unlock(sdata);
761 }
762
763 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
764 {
765 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
766 int err;
767
768 /* if the current channel is a DFS channel, mark the channel as
769 * unavailable.
770 */
771 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
772 &ifibss->chandef,
773 NL80211_IFTYPE_ADHOC);
774 if (err > 0)
775 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
776 GFP_ATOMIC);
777 }
778
779 static bool
780 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
781 struct ieee802_11_elems *elems,
782 bool beacon)
783 {
784 struct cfg80211_csa_settings params;
785 struct ieee80211_csa_ie csa_ie;
786 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
787 enum nl80211_channel_type ch_type;
788 int err;
789 u32 sta_flags;
790
791 sdata_assert_lock(sdata);
792
793 sta_flags = IEEE80211_STA_DISABLE_VHT;
794 switch (ifibss->chandef.width) {
795 case NL80211_CHAN_WIDTH_5:
796 case NL80211_CHAN_WIDTH_10:
797 case NL80211_CHAN_WIDTH_20_NOHT:
798 sta_flags |= IEEE80211_STA_DISABLE_HT;
799 /* fall through */
800 case NL80211_CHAN_WIDTH_20:
801 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
802 break;
803 default:
804 break;
805 }
806
807 memset(&params, 0, sizeof(params));
808 memset(&csa_ie, 0, sizeof(csa_ie));
809 err = ieee80211_parse_ch_switch_ie(sdata, elems,
810 ifibss->chandef.chan->band,
811 sta_flags, ifibss->bssid, &csa_ie);
812 /* can't switch to destination channel, fail */
813 if (err < 0)
814 goto disconnect;
815
816 /* did not contain a CSA */
817 if (err)
818 return false;
819
820 /* channel switch is not supported, disconnect */
821 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
822 goto disconnect;
823
824 params.count = csa_ie.count;
825 params.chandef = csa_ie.chandef;
826
827 switch (ifibss->chandef.width) {
828 case NL80211_CHAN_WIDTH_20_NOHT:
829 case NL80211_CHAN_WIDTH_20:
830 case NL80211_CHAN_WIDTH_40:
831 /* keep our current HT mode (HT20/HT40+/HT40-), even if
832 * another mode has been announced. The mode is not adopted
833 * within the beacon while doing CSA and we should therefore
834 * keep the mode which we announce.
835 */
836 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
837 cfg80211_chandef_create(&params.chandef, params.chandef.chan,
838 ch_type);
839 break;
840 case NL80211_CHAN_WIDTH_5:
841 case NL80211_CHAN_WIDTH_10:
842 if (params.chandef.width != ifibss->chandef.width) {
843 sdata_info(sdata,
844 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
845 ifibss->bssid,
846 params.chandef.chan->center_freq,
847 params.chandef.width,
848 params.chandef.center_freq1,
849 params.chandef.center_freq2);
850 goto disconnect;
851 }
852 break;
853 default:
854 /* should not happen, sta_flags should prevent VHT modes. */
855 WARN_ON(1);
856 goto disconnect;
857 }
858
859 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
860 NL80211_IFTYPE_ADHOC)) {
861 sdata_info(sdata,
862 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
863 ifibss->bssid,
864 params.chandef.chan->center_freq,
865 params.chandef.width,
866 params.chandef.center_freq1,
867 params.chandef.center_freq2);
868 goto disconnect;
869 }
870
871 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
872 &params.chandef,
873 NL80211_IFTYPE_ADHOC);
874 if (err < 0)
875 goto disconnect;
876 if (err > 0 && !ifibss->userspace_handles_dfs) {
877 /* IBSS-DFS only allowed with a control program */
878 goto disconnect;
879 }
880
881 params.radar_required = err;
882
883 if (cfg80211_chandef_identical(&params.chandef,
884 &sdata->vif.bss_conf.chandef)) {
885 ibss_dbg(sdata,
886 "received csa with an identical chandef, ignoring\n");
887 return true;
888 }
889
890 /* all checks done, now perform the channel switch. */
891 ibss_dbg(sdata,
892 "received channel switch announcement to go to channel %d MHz\n",
893 params.chandef.chan->center_freq);
894
895 params.block_tx = !!csa_ie.mode;
896
897 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
898 &params))
899 goto disconnect;
900
901 ieee80211_ibss_csa_mark_radar(sdata);
902
903 return true;
904 disconnect:
905 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
906 ieee80211_queue_work(&sdata->local->hw,
907 &ifibss->csa_connection_drop_work);
908
909 ieee80211_ibss_csa_mark_radar(sdata);
910
911 return true;
912 }
913
914 static void
915 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
916 struct ieee80211_mgmt *mgmt, size_t len,
917 struct ieee80211_rx_status *rx_status,
918 struct ieee802_11_elems *elems)
919 {
920 int required_len;
921
922 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
923 return;
924
925 /* CSA is the only action we handle for now */
926 if (mgmt->u.action.u.measurement.action_code !=
927 WLAN_ACTION_SPCT_CHL_SWITCH)
928 return;
929
930 required_len = IEEE80211_MIN_ACTION_SIZE +
931 sizeof(mgmt->u.action.u.chan_switch);
932 if (len < required_len)
933 return;
934
935 if (!sdata->vif.csa_active)
936 ieee80211_ibss_process_chanswitch(sdata, elems, false);
937 }
938
939 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
940 struct ieee80211_mgmt *mgmt,
941 size_t len)
942 {
943 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
944
945 if (len < IEEE80211_DEAUTH_FRAME_LEN)
946 return;
947
948 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
949 mgmt->sa, mgmt->da, mgmt->bssid, reason);
950 sta_info_destroy_addr(sdata, mgmt->sa);
951 }
952
953 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
954 struct ieee80211_mgmt *mgmt,
955 size_t len)
956 {
957 u16 auth_alg, auth_transaction;
958
959 sdata_assert_lock(sdata);
960
961 if (len < 24 + 6)
962 return;
963
964 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
965 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
966
967 ibss_dbg(sdata,
968 "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
969 mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
970
971 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
972 return;
973
974 /*
975 * IEEE 802.11 standard does not require authentication in IBSS
976 * networks and most implementations do not seem to use it.
977 * However, try to reply to authentication attempts if someone
978 * has actually implemented this.
979 */
980 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
981 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
982 }
983
984 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
985 struct ieee80211_mgmt *mgmt, size_t len,
986 struct ieee80211_rx_status *rx_status,
987 struct ieee802_11_elems *elems,
988 struct ieee80211_channel *channel)
989 {
990 struct sta_info *sta;
991 enum ieee80211_band band = rx_status->band;
992 enum nl80211_bss_scan_width scan_width;
993 struct ieee80211_local *local = sdata->local;
994 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
995 bool rates_updated = false;
996 u32 supp_rates = 0;
997
998 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
999 return;
1000
1001 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
1002 return;
1003
1004 rcu_read_lock();
1005 sta = sta_info_get(sdata, mgmt->sa);
1006
1007 if (elems->supp_rates) {
1008 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1009 band, NULL);
1010 if (sta) {
1011 u32 prev_rates;
1012
1013 prev_rates = sta->sta.supp_rates[band];
1014 /* make sure mandatory rates are always added */
1015 scan_width = NL80211_BSS_CHAN_WIDTH_20;
1016 if (rx_status->flag & RX_FLAG_5MHZ)
1017 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1018 if (rx_status->flag & RX_FLAG_10MHZ)
1019 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1020
1021 sta->sta.supp_rates[band] = supp_rates |
1022 ieee80211_mandatory_rates(sband, scan_width);
1023 if (sta->sta.supp_rates[band] != prev_rates) {
1024 ibss_dbg(sdata,
1025 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1026 sta->sta.addr, prev_rates,
1027 sta->sta.supp_rates[band]);
1028 rates_updated = true;
1029 }
1030 } else {
1031 rcu_read_unlock();
1032 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1033 mgmt->sa, supp_rates);
1034 }
1035 }
1036
1037 if (sta && !sta->sta.wme &&
1038 elems->wmm_info && local->hw.queues >= IEEE80211_NUM_ACS) {
1039 sta->sta.wme = true;
1040 ieee80211_check_fast_xmit(sta);
1041 }
1042
1043 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1044 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1045 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1046 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1047 /* we both use HT */
1048 struct ieee80211_ht_cap htcap_ie;
1049 struct cfg80211_chan_def chandef;
1050 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
1051
1052 ieee80211_ht_oper_to_chandef(channel,
1053 elems->ht_operation,
1054 &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_vht_oper_to_chandef(channel,
1069 elems->vht_operation,
1070 &chandef);
1071 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1072 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1073 &cap_ie, sta);
1074 if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap)))
1075 rates_updated |= true;
1076 }
1077
1078 if (bw != sta->sta.bandwidth)
1079 rates_updated |= true;
1080
1081 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1082 &chandef))
1083 WARN_ON_ONCE(1);
1084 }
1085
1086 if (sta && rates_updated) {
1087 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1088 u8 rx_nss = sta->sta.rx_nss;
1089
1090 /* Force rx_nss recalculation */
1091 sta->sta.rx_nss = 0;
1092 rate_control_rate_init(sta);
1093 if (sta->sta.rx_nss != rx_nss)
1094 changed |= IEEE80211_RC_NSS_CHANGED;
1095
1096 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1097 }
1098
1099 rcu_read_unlock();
1100 }
1101
1102 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1103 struct ieee80211_mgmt *mgmt, size_t len,
1104 struct ieee80211_rx_status *rx_status,
1105 struct ieee802_11_elems *elems)
1106 {
1107 struct ieee80211_local *local = sdata->local;
1108 struct cfg80211_bss *cbss;
1109 struct ieee80211_bss *bss;
1110 struct ieee80211_channel *channel;
1111 u64 beacon_timestamp, rx_timestamp;
1112 u32 supp_rates = 0;
1113 enum ieee80211_band band = rx_status->band;
1114
1115 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1116 if (!channel)
1117 return;
1118
1119 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1120
1121 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1122 channel);
1123 if (!bss)
1124 return;
1125
1126 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1127
1128 /* same for beacon and probe response */
1129 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1130
1131 /* check if we need to merge IBSS */
1132
1133 /* not an IBSS */
1134 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1135 goto put_bss;
1136
1137 /* different channel */
1138 if (sdata->u.ibss.fixed_channel &&
1139 sdata->u.ibss.chandef.chan != cbss->channel)
1140 goto put_bss;
1141
1142 /* different SSID */
1143 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1144 memcmp(elems->ssid, sdata->u.ibss.ssid,
1145 sdata->u.ibss.ssid_len))
1146 goto put_bss;
1147
1148 /* process channel switch */
1149 if (sdata->vif.csa_active ||
1150 ieee80211_ibss_process_chanswitch(sdata, elems, true))
1151 goto put_bss;
1152
1153 /* same BSSID */
1154 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1155 goto put_bss;
1156
1157 /* we use a fixed BSSID */
1158 if (sdata->u.ibss.fixed_bssid)
1159 goto put_bss;
1160
1161 if (ieee80211_have_rx_timestamp(rx_status)) {
1162 /* time when timestamp field was received */
1163 rx_timestamp =
1164 ieee80211_calculate_rx_timestamp(local, rx_status,
1165 len + FCS_LEN, 24);
1166 } else {
1167 /*
1168 * second best option: get current TSF
1169 * (will return -1 if not supported)
1170 */
1171 rx_timestamp = drv_get_tsf(local, sdata);
1172 }
1173
1174 ibss_dbg(sdata,
1175 "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1176 mgmt->sa, mgmt->bssid,
1177 (unsigned long long)rx_timestamp,
1178 (unsigned long long)beacon_timestamp,
1179 (unsigned long long)(rx_timestamp - beacon_timestamp),
1180 jiffies);
1181
1182 if (beacon_timestamp > rx_timestamp) {
1183 ibss_dbg(sdata,
1184 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1185 mgmt->bssid);
1186 ieee80211_sta_join_ibss(sdata, bss);
1187 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1188 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1189 supp_rates);
1190 rcu_read_unlock();
1191 }
1192
1193 put_bss:
1194 ieee80211_rx_bss_put(local, bss);
1195 }
1196
1197 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1198 const u8 *bssid, const u8 *addr,
1199 u32 supp_rates)
1200 {
1201 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1202 struct ieee80211_local *local = sdata->local;
1203 struct sta_info *sta;
1204 struct ieee80211_chanctx_conf *chanctx_conf;
1205 struct ieee80211_supported_band *sband;
1206 enum nl80211_bss_scan_width scan_width;
1207 int band;
1208
1209 /*
1210 * XXX: Consider removing the least recently used entry and
1211 * allow new one to be added.
1212 */
1213 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1214 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1215 sdata->name, addr);
1216 return;
1217 }
1218
1219 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1220 return;
1221
1222 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1223 return;
1224
1225 rcu_read_lock();
1226 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1227 if (WARN_ON_ONCE(!chanctx_conf)) {
1228 rcu_read_unlock();
1229 return;
1230 }
1231 band = chanctx_conf->def.chan->band;
1232 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1233 rcu_read_unlock();
1234
1235 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1236 if (!sta)
1237 return;
1238
1239 sta->rx_stats.last_rx = jiffies;
1240
1241 /* make sure mandatory rates are always added */
1242 sband = local->hw.wiphy->bands[band];
1243 sta->sta.supp_rates[band] = supp_rates |
1244 ieee80211_mandatory_rates(sband, scan_width);
1245
1246 spin_lock(&ifibss->incomplete_lock);
1247 list_add(&sta->list, &ifibss->incomplete_stations);
1248 spin_unlock(&ifibss->incomplete_lock);
1249 ieee80211_queue_work(&local->hw, &sdata->work);
1250 }
1251
1252 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1253 {
1254 struct ieee80211_local *local = sdata->local;
1255 struct sta_info *sta, *tmp;
1256 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1257 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1258
1259 mutex_lock(&local->sta_mtx);
1260
1261 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1262 if (sdata != sta->sdata)
1263 continue;
1264
1265 if (time_after(jiffies, sta->rx_stats.last_rx + exp_time) ||
1266 (time_after(jiffies, sta->rx_stats.last_rx + exp_rsn) &&
1267 sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1268 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1269 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1270 "not authorized " : "", sta->sta.addr);
1271
1272 WARN_ON(__sta_info_destroy(sta));
1273 }
1274 }
1275
1276 mutex_unlock(&local->sta_mtx);
1277 }
1278
1279 /*
1280 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1281 */
1282
1283 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1284 {
1285 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1286 enum nl80211_bss_scan_width scan_width;
1287
1288 sdata_assert_lock(sdata);
1289
1290 mod_timer(&ifibss->timer,
1291 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1292
1293 ieee80211_ibss_sta_expire(sdata);
1294
1295 if (time_before(jiffies, ifibss->last_scan_completed +
1296 IEEE80211_IBSS_MERGE_INTERVAL))
1297 return;
1298
1299 if (ieee80211_sta_active_ibss(sdata))
1300 return;
1301
1302 if (ifibss->fixed_channel)
1303 return;
1304
1305 sdata_info(sdata,
1306 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1307
1308 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1309 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1310 NULL, 0, scan_width);
1311 }
1312
1313 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1314 {
1315 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1316 u8 bssid[ETH_ALEN];
1317 u16 capability;
1318 int i;
1319
1320 sdata_assert_lock(sdata);
1321
1322 if (ifibss->fixed_bssid) {
1323 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1324 } else {
1325 /* Generate random, not broadcast, locally administered BSSID. Mix in
1326 * own MAC address to make sure that devices that do not have proper
1327 * random number generator get different BSSID. */
1328 get_random_bytes(bssid, ETH_ALEN);
1329 for (i = 0; i < ETH_ALEN; i++)
1330 bssid[i] ^= sdata->vif.addr[i];
1331 bssid[0] &= ~0x01;
1332 bssid[0] |= 0x02;
1333 }
1334
1335 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1336
1337 capability = WLAN_CAPABILITY_IBSS;
1338
1339 if (ifibss->privacy)
1340 capability |= WLAN_CAPABILITY_PRIVACY;
1341
1342 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1343 &ifibss->chandef, ifibss->basic_rates,
1344 capability, 0, true);
1345 }
1346
1347 static unsigned ibss_setup_channels(struct wiphy *wiphy,
1348 struct ieee80211_channel **channels,
1349 unsigned int channels_max,
1350 u32 center_freq, u32 width)
1351 {
1352 struct ieee80211_channel *chan = NULL;
1353 unsigned int n_chan = 0;
1354 u32 start_freq, end_freq, freq;
1355
1356 if (width <= 20) {
1357 start_freq = center_freq;
1358 end_freq = center_freq;
1359 } else {
1360 start_freq = center_freq - width / 2 + 10;
1361 end_freq = center_freq + width / 2 - 10;
1362 }
1363
1364 for (freq = start_freq; freq <= end_freq; freq += 20) {
1365 chan = ieee80211_get_channel(wiphy, freq);
1366 if (!chan)
1367 continue;
1368 if (n_chan >= channels_max)
1369 return n_chan;
1370
1371 channels[n_chan] = chan;
1372 n_chan++;
1373 }
1374
1375 return n_chan;
1376 }
1377
1378 static unsigned int
1379 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1380 const struct cfg80211_chan_def *chandef,
1381 struct ieee80211_channel **channels,
1382 unsigned int channels_max)
1383 {
1384 unsigned int n_chan = 0;
1385 u32 width, cf1, cf2 = 0;
1386
1387 switch (chandef->width) {
1388 case NL80211_CHAN_WIDTH_40:
1389 width = 40;
1390 break;
1391 case NL80211_CHAN_WIDTH_80P80:
1392 cf2 = chandef->center_freq2;
1393 /* fall through */
1394 case NL80211_CHAN_WIDTH_80:
1395 width = 80;
1396 break;
1397 case NL80211_CHAN_WIDTH_160:
1398 width = 160;
1399 break;
1400 default:
1401 width = 20;
1402 break;
1403 }
1404
1405 cf1 = chandef->center_freq1;
1406
1407 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1408
1409 if (cf2)
1410 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1411 channels_max - n_chan, cf2,
1412 width);
1413
1414 return n_chan;
1415 }
1416
1417 /*
1418 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1419 */
1420
1421 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1422 {
1423 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1424 struct ieee80211_local *local = sdata->local;
1425 struct cfg80211_bss *cbss;
1426 struct ieee80211_channel *chan = NULL;
1427 const u8 *bssid = NULL;
1428 enum nl80211_bss_scan_width scan_width;
1429 int active_ibss;
1430
1431 sdata_assert_lock(sdata);
1432
1433 active_ibss = ieee80211_sta_active_ibss(sdata);
1434 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1435
1436 if (active_ibss)
1437 return;
1438
1439 if (ifibss->fixed_bssid)
1440 bssid = ifibss->bssid;
1441 if (ifibss->fixed_channel)
1442 chan = ifibss->chandef.chan;
1443 if (!is_zero_ether_addr(ifibss->bssid))
1444 bssid = ifibss->bssid;
1445 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1446 ifibss->ssid, ifibss->ssid_len,
1447 IEEE80211_BSS_TYPE_IBSS,
1448 IEEE80211_PRIVACY(ifibss->privacy));
1449
1450 if (cbss) {
1451 struct ieee80211_bss *bss;
1452
1453 bss = (void *)cbss->priv;
1454 ibss_dbg(sdata,
1455 "sta_find_ibss: selected %pM current %pM\n",
1456 cbss->bssid, ifibss->bssid);
1457 sdata_info(sdata,
1458 "Selected IBSS BSSID %pM based on configured SSID\n",
1459 cbss->bssid);
1460
1461 ieee80211_sta_join_ibss(sdata, bss);
1462 ieee80211_rx_bss_put(local, bss);
1463 return;
1464 }
1465
1466 /* if a fixed bssid and a fixed freq have been provided create the IBSS
1467 * directly and do not waste time scanning
1468 */
1469 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1470 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1471 bssid);
1472 ieee80211_sta_create_ibss(sdata);
1473 return;
1474 }
1475
1476
1477 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1478
1479 /* Selected IBSS not found in current scan results - try to scan */
1480 if (time_after(jiffies, ifibss->last_scan_completed +
1481 IEEE80211_SCAN_INTERVAL)) {
1482 struct ieee80211_channel *channels[8];
1483 unsigned int num;
1484
1485 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1486
1487 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1488 &ifibss->chandef,
1489 channels,
1490 ARRAY_SIZE(channels));
1491 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1492 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1493 ifibss->ssid_len, channels, num,
1494 scan_width);
1495 } else {
1496 int interval = IEEE80211_SCAN_INTERVAL;
1497
1498 if (time_after(jiffies, ifibss->ibss_join_req +
1499 IEEE80211_IBSS_JOIN_TIMEOUT))
1500 ieee80211_sta_create_ibss(sdata);
1501
1502 mod_timer(&ifibss->timer,
1503 round_jiffies(jiffies + interval));
1504 }
1505 }
1506
1507 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1508 struct sk_buff *req)
1509 {
1510 struct ieee80211_mgmt *mgmt = (void *)req->data;
1511 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1512 struct ieee80211_local *local = sdata->local;
1513 int tx_last_beacon, len = req->len;
1514 struct sk_buff *skb;
1515 struct beacon_data *presp;
1516 u8 *pos, *end;
1517
1518 sdata_assert_lock(sdata);
1519
1520 presp = rcu_dereference_protected(ifibss->presp,
1521 lockdep_is_held(&sdata->wdev.mtx));
1522
1523 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1524 len < 24 + 2 || !presp)
1525 return;
1526
1527 tx_last_beacon = drv_tx_last_beacon(local);
1528
1529 ibss_dbg(sdata,
1530 "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
1531 mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
1532
1533 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1534 return;
1535
1536 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1537 !is_broadcast_ether_addr(mgmt->bssid))
1538 return;
1539
1540 end = ((u8 *) mgmt) + len;
1541 pos = mgmt->u.probe_req.variable;
1542 if (pos[0] != WLAN_EID_SSID ||
1543 pos + 2 + pos[1] > end) {
1544 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1545 mgmt->sa);
1546 return;
1547 }
1548 if (pos[1] != 0 &&
1549 (pos[1] != ifibss->ssid_len ||
1550 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1551 /* Ignore ProbeReq for foreign SSID */
1552 return;
1553 }
1554
1555 /* Reply with ProbeResp */
1556 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1557 if (!skb)
1558 return;
1559
1560 skb_reserve(skb, local->tx_headroom);
1561 memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
1562
1563 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1564 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1565 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1566
1567 /* avoid excessive retries for probe request to wildcard SSIDs */
1568 if (pos[1] == 0)
1569 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1570
1571 ieee80211_tx_skb(sdata, skb);
1572 }
1573
1574 static
1575 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1576 struct ieee80211_mgmt *mgmt, size_t len,
1577 struct ieee80211_rx_status *rx_status)
1578 {
1579 size_t baselen;
1580 struct ieee802_11_elems elems;
1581
1582 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1583 offsetof(typeof(mgmt->u.beacon), variable));
1584
1585 /*
1586 * either beacon or probe_resp but the variable field is at the
1587 * same offset
1588 */
1589 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1590 if (baselen > len)
1591 return;
1592
1593 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1594 false, &elems);
1595
1596 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1597 }
1598
1599 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1600 struct sk_buff *skb)
1601 {
1602 struct ieee80211_rx_status *rx_status;
1603 struct ieee80211_mgmt *mgmt;
1604 u16 fc;
1605 struct ieee802_11_elems elems;
1606 int ies_len;
1607
1608 rx_status = IEEE80211_SKB_RXCB(skb);
1609 mgmt = (struct ieee80211_mgmt *) skb->data;
1610 fc = le16_to_cpu(mgmt->frame_control);
1611
1612 sdata_lock(sdata);
1613
1614 if (!sdata->u.ibss.ssid_len)
1615 goto mgmt_out; /* not ready to merge yet */
1616
1617 switch (fc & IEEE80211_FCTL_STYPE) {
1618 case IEEE80211_STYPE_PROBE_REQ:
1619 ieee80211_rx_mgmt_probe_req(sdata, skb);
1620 break;
1621 case IEEE80211_STYPE_PROBE_RESP:
1622 case IEEE80211_STYPE_BEACON:
1623 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1624 rx_status);
1625 break;
1626 case IEEE80211_STYPE_AUTH:
1627 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1628 break;
1629 case IEEE80211_STYPE_DEAUTH:
1630 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1631 break;
1632 case IEEE80211_STYPE_ACTION:
1633 switch (mgmt->u.action.category) {
1634 case WLAN_CATEGORY_SPECTRUM_MGMT:
1635 ies_len = skb->len -
1636 offsetof(struct ieee80211_mgmt,
1637 u.action.u.chan_switch.variable);
1638
1639 if (ies_len < 0)
1640 break;
1641
1642 ieee802_11_parse_elems(
1643 mgmt->u.action.u.chan_switch.variable,
1644 ies_len, true, &elems);
1645
1646 if (elems.parse_error)
1647 break;
1648
1649 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1650 rx_status, &elems);
1651 break;
1652 }
1653 }
1654
1655 mgmt_out:
1656 sdata_unlock(sdata);
1657 }
1658
1659 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1660 {
1661 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1662 struct sta_info *sta;
1663
1664 sdata_lock(sdata);
1665
1666 /*
1667 * Work could be scheduled after scan or similar
1668 * when we aren't even joined (or trying) with a
1669 * network.
1670 */
1671 if (!ifibss->ssid_len)
1672 goto out;
1673
1674 spin_lock_bh(&ifibss->incomplete_lock);
1675 while (!list_empty(&ifibss->incomplete_stations)) {
1676 sta = list_first_entry(&ifibss->incomplete_stations,
1677 struct sta_info, list);
1678 list_del(&sta->list);
1679 spin_unlock_bh(&ifibss->incomplete_lock);
1680
1681 ieee80211_ibss_finish_sta(sta);
1682 rcu_read_unlock();
1683 spin_lock_bh(&ifibss->incomplete_lock);
1684 }
1685 spin_unlock_bh(&ifibss->incomplete_lock);
1686
1687 switch (ifibss->state) {
1688 case IEEE80211_IBSS_MLME_SEARCH:
1689 ieee80211_sta_find_ibss(sdata);
1690 break;
1691 case IEEE80211_IBSS_MLME_JOINED:
1692 ieee80211_sta_merge_ibss(sdata);
1693 break;
1694 default:
1695 WARN_ON(1);
1696 break;
1697 }
1698
1699 out:
1700 sdata_unlock(sdata);
1701 }
1702
1703 static void ieee80211_ibss_timer(unsigned long data)
1704 {
1705 struct ieee80211_sub_if_data *sdata =
1706 (struct ieee80211_sub_if_data *) data;
1707
1708 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1709 }
1710
1711 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1712 {
1713 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1714
1715 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1716 (unsigned long) sdata);
1717 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1718 spin_lock_init(&ifibss->incomplete_lock);
1719 INIT_WORK(&ifibss->csa_connection_drop_work,
1720 ieee80211_csa_connection_drop_work);
1721 }
1722
1723 /* scan finished notification */
1724 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1725 {
1726 struct ieee80211_sub_if_data *sdata;
1727
1728 mutex_lock(&local->iflist_mtx);
1729 list_for_each_entry(sdata, &local->interfaces, list) {
1730 if (!ieee80211_sdata_running(sdata))
1731 continue;
1732 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1733 continue;
1734 sdata->u.ibss.last_scan_completed = jiffies;
1735 ieee80211_queue_work(&local->hw, &sdata->work);
1736 }
1737 mutex_unlock(&local->iflist_mtx);
1738 }
1739
1740 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1741 struct cfg80211_ibss_params *params)
1742 {
1743 u32 changed = 0;
1744 u32 rate_flags;
1745 struct ieee80211_supported_band *sband;
1746 enum ieee80211_chanctx_mode chanmode;
1747 struct ieee80211_local *local = sdata->local;
1748 int radar_detect_width = 0;
1749 int i;
1750 int ret;
1751
1752 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1753 &params->chandef,
1754 sdata->wdev.iftype);
1755 if (ret < 0)
1756 return ret;
1757
1758 if (ret > 0) {
1759 if (!params->userspace_handles_dfs)
1760 return -EINVAL;
1761 radar_detect_width = BIT(params->chandef.width);
1762 }
1763
1764 chanmode = (params->channel_fixed && !ret) ?
1765 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1766
1767 mutex_lock(&local->chanctx_mtx);
1768 ret = ieee80211_check_combinations(sdata, &params->chandef, chanmode,
1769 radar_detect_width);
1770 mutex_unlock(&local->chanctx_mtx);
1771 if (ret < 0)
1772 return ret;
1773
1774 if (params->bssid) {
1775 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1776 sdata->u.ibss.fixed_bssid = true;
1777 } else
1778 sdata->u.ibss.fixed_bssid = false;
1779
1780 sdata->u.ibss.privacy = params->privacy;
1781 sdata->u.ibss.control_port = params->control_port;
1782 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1783 sdata->u.ibss.basic_rates = params->basic_rates;
1784 sdata->u.ibss.last_scan_completed = jiffies;
1785
1786 /* fix basic_rates if channel does not support these rates */
1787 rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
1788 sband = local->hw.wiphy->bands[params->chandef.chan->band];
1789 for (i = 0; i < sband->n_bitrates; i++) {
1790 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1791 sdata->u.ibss.basic_rates &= ~BIT(i);
1792 }
1793 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1794 sizeof(params->mcast_rate));
1795
1796 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1797
1798 sdata->u.ibss.chandef = params->chandef;
1799 sdata->u.ibss.fixed_channel = params->channel_fixed;
1800
1801 if (params->ie) {
1802 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1803 GFP_KERNEL);
1804 if (sdata->u.ibss.ie)
1805 sdata->u.ibss.ie_len = params->ie_len;
1806 }
1807
1808 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1809 sdata->u.ibss.ibss_join_req = jiffies;
1810
1811 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1812 sdata->u.ibss.ssid_len = params->ssid_len;
1813
1814 memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1815 sizeof(sdata->u.ibss.ht_capa));
1816 memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1817 sizeof(sdata->u.ibss.ht_capa_mask));
1818
1819 /*
1820 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1821 * reserved, but an HT STA shall protect HT transmissions as though
1822 * the HT Protection field were set to non-HT mixed mode.
1823 *
1824 * In an IBSS, the RIFS Mode field of the HT Operation element is
1825 * also reserved, but an HT STA shall operate as though this field
1826 * were set to 1.
1827 */
1828
1829 sdata->vif.bss_conf.ht_operation_mode |=
1830 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1831 | IEEE80211_HT_PARAM_RIFS_MODE;
1832
1833 changed |= BSS_CHANGED_HT;
1834 ieee80211_bss_info_change_notify(sdata, changed);
1835
1836 sdata->smps_mode = IEEE80211_SMPS_OFF;
1837 sdata->needed_rx_chains = local->rx_chains;
1838
1839 ieee80211_queue_work(&local->hw, &sdata->work);
1840
1841 return 0;
1842 }
1843
1844 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1845 {
1846 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1847
1848 ieee80211_ibss_disconnect(sdata);
1849 ifibss->ssid_len = 0;
1850 eth_zero_addr(ifibss->bssid);
1851
1852 /* remove beacon */
1853 kfree(sdata->u.ibss.ie);
1854
1855 /* on the next join, re-program HT parameters */
1856 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1857 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1858
1859 synchronize_rcu();
1860
1861 skb_queue_purge(&sdata->skb_queue);
1862
1863 del_timer_sync(&sdata->u.ibss.timer);
1864
1865 return 0;
1866 }
Linux with added FPC-III support