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octeontx2-pf: Fix error return code in otx2_probe()
[linux/fpc-iii.git] / net / mac80211 / ibss.c
blobd40744903fa90f596435d7e9fdb4d46ec39683b3
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * IBSS mode implementation
4 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
5 * Copyright 2004, Instant802 Networks, Inc.
6 * Copyright 2005, Devicescape Software, Inc.
7 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
8 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
9 * Copyright 2009, Johannes Berg <johannes@sipsolutions.net>
10 * Copyright 2013-2014 Intel Mobile Communications GmbH
11 * Copyright(c) 2016 Intel Deutschland GmbH
12 * Copyright(c) 2018-2019 Intel Corporation
13 */
14
15 #include <linux/delay.h>
16 #include <linux/slab.h>
17 #include <linux/if_ether.h>
18 #include <linux/skbuff.h>
19 #include <linux/if_arp.h>
20 #include <linux/etherdevice.h>
21 #include <linux/rtnetlink.h>
22 #include <net/mac80211.h>
23
24 #include "ieee80211_i.h"
25 #include "driver-ops.h"
26 #include "rate.h"
27
28 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
29 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
30
31 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
32 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
33 #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ)
34
35 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
36
37 static struct beacon_data *
38 ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata,
39 const int beacon_int, const u32 basic_rates,
40 const u16 capability, u64 tsf,
41 struct cfg80211_chan_def *chandef,
42 bool *have_higher_than_11mbit,
43 struct cfg80211_csa_settings *csa_settings)
44 {
45 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
46 struct ieee80211_local *local = sdata->local;
47 int rates_n = 0, i, ri;
48 struct ieee80211_mgmt *mgmt;
49 u8 *pos;
50 struct ieee80211_supported_band *sband;
51 u32 rate_flags, rates = 0, rates_added = 0;
52 struct beacon_data *presp;
53 int frame_len;
54 int shift;
55
56 /* Build IBSS probe response */
57 frame_len = sizeof(struct ieee80211_hdr_3addr) +
58 12 /* struct ieee80211_mgmt.u.beacon */ +
59 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
60 2 + 8 /* max Supported Rates */ +
61 3 /* max DS params */ +
62 4 /* IBSS params */ +
63 5 /* Channel Switch Announcement */ +
64 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
65 2 + sizeof(struct ieee80211_ht_cap) +
66 2 + sizeof(struct ieee80211_ht_operation) +
67 2 + sizeof(struct ieee80211_vht_cap) +
68 2 + sizeof(struct ieee80211_vht_operation) +
69 ifibss->ie_len;
70 presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
71 if (!presp)
72 return NULL;
73
74 presp->head = (void *)(presp + 1);
75
76 mgmt = (void *) presp->head;
77 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
78 IEEE80211_STYPE_PROBE_RESP);
79 eth_broadcast_addr(mgmt->da);
80 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
81 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
82 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
83 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
84 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
85
86 pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
87
88 *pos++ = WLAN_EID_SSID;
89 *pos++ = ifibss->ssid_len;
90 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
91 pos += ifibss->ssid_len;
92
93 sband = local->hw.wiphy->bands[chandef->chan->band];
94 rate_flags = ieee80211_chandef_rate_flags(chandef);
95 shift = ieee80211_chandef_get_shift(chandef);
96 rates_n = 0;
97 if (have_higher_than_11mbit)
98 *have_higher_than_11mbit = false;
99
100 for (i = 0; i < sband->n_bitrates; i++) {
101 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
102 continue;
103 if (sband->bitrates[i].bitrate > 110 &&
104 have_higher_than_11mbit)
105 *have_higher_than_11mbit = true;
106
107 rates |= BIT(i);
108 rates_n++;
109 }
110
111 *pos++ = WLAN_EID_SUPP_RATES;
112 *pos++ = min_t(int, 8, rates_n);
113 for (ri = 0; ri < sband->n_bitrates; ri++) {
114 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
115 5 * (1 << shift));
116 u8 basic = 0;
117 if (!(rates & BIT(ri)))
118 continue;
119
120 if (basic_rates & BIT(ri))
121 basic = 0x80;
122 *pos++ = basic | (u8) rate;
123 if (++rates_added == 8) {
124 ri++; /* continue at next rate for EXT_SUPP_RATES */
125 break;
126 }
127 }
128
129 if (sband->band == NL80211_BAND_2GHZ) {
130 *pos++ = WLAN_EID_DS_PARAMS;
131 *pos++ = 1;
132 *pos++ = ieee80211_frequency_to_channel(
133 chandef->chan->center_freq);
134 }
135
136 *pos++ = WLAN_EID_IBSS_PARAMS;
137 *pos++ = 2;
138 /* FIX: set ATIM window based on scan results */
139 *pos++ = 0;
140 *pos++ = 0;
141
142 if (csa_settings) {
143 *pos++ = WLAN_EID_CHANNEL_SWITCH;
144 *pos++ = 3;
145 *pos++ = csa_settings->block_tx ? 1 : 0;
146 *pos++ = ieee80211_frequency_to_channel(
147 csa_settings->chandef.chan->center_freq);
148 presp->csa_counter_offsets[0] = (pos - presp->head);
149 *pos++ = csa_settings->count;
150 presp->csa_current_counter = csa_settings->count;
151 }
152
153 /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
154 if (rates_n > 8) {
155 *pos++ = WLAN_EID_EXT_SUPP_RATES;
156 *pos++ = rates_n - 8;
157 for (; ri < sband->n_bitrates; ri++) {
158 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
159 5 * (1 << shift));
160 u8 basic = 0;
161 if (!(rates & BIT(ri)))
162 continue;
163
164 if (basic_rates & BIT(ri))
165 basic = 0x80;
166 *pos++ = basic | (u8) rate;
167 }
168 }
169
170 if (ifibss->ie_len) {
171 memcpy(pos, ifibss->ie, ifibss->ie_len);
172 pos += ifibss->ie_len;
173 }
174
175 /* add HT capability and information IEs */
176 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
177 chandef->width != NL80211_CHAN_WIDTH_5 &&
178 chandef->width != NL80211_CHAN_WIDTH_10 &&
179 sband->ht_cap.ht_supported) {
180 struct ieee80211_sta_ht_cap ht_cap;
181
182 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
183 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
184
185 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
186 /*
187 * Note: According to 802.11n-2009 9.13.3.1, HT Protection
188 * field and RIFS Mode are reserved in IBSS mode, therefore
189 * keep them at 0
190 */
191 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
192 chandef, 0, false);
193
194 /* add VHT capability and information IEs */
195 if (chandef->width != NL80211_CHAN_WIDTH_20 &&
196 chandef->width != NL80211_CHAN_WIDTH_40 &&
197 sband->vht_cap.vht_supported) {
198 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
199 sband->vht_cap.cap);
200 pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap,
201 chandef);
202 }
203 }
204
205 if (local->hw.queues >= IEEE80211_NUM_ACS)
206 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */
207
208 presp->head_len = pos - presp->head;
209 if (WARN_ON(presp->head_len > frame_len))
210 goto error;
211
212 return presp;
213 error:
214 kfree(presp);
215 return NULL;
216 }
217
218 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
219 const u8 *bssid, const int beacon_int,
220 struct cfg80211_chan_def *req_chandef,
221 const u32 basic_rates,
222 const u16 capability, u64 tsf,
223 bool creator)
224 {
225 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
226 struct ieee80211_local *local = sdata->local;
227 struct ieee80211_mgmt *mgmt;
228 struct cfg80211_bss *bss;
229 u32 bss_change;
230 struct cfg80211_chan_def chandef;
231 struct ieee80211_channel *chan;
232 struct beacon_data *presp;
233 struct cfg80211_inform_bss bss_meta = {};
234 bool have_higher_than_11mbit;
235 bool radar_required;
236 int err;
237
238 sdata_assert_lock(sdata);
239
240 /* Reset own TSF to allow time synchronization work. */
241 drv_reset_tsf(local, sdata);
242
243 if (!ether_addr_equal(ifibss->bssid, bssid))
244 sta_info_flush(sdata);
245
246 /* if merging, indicate to driver that we leave the old IBSS */
247 if (sdata->vif.bss_conf.ibss_joined) {
248 sdata->vif.bss_conf.ibss_joined = false;
249 sdata->vif.bss_conf.ibss_creator = false;
250 sdata->vif.bss_conf.enable_beacon = false;
251 netif_carrier_off(sdata->dev);
252 ieee80211_bss_info_change_notify(sdata,
253 BSS_CHANGED_IBSS |
254 BSS_CHANGED_BEACON_ENABLED);
255 drv_leave_ibss(local, sdata);
256 }
257
258 presp = rcu_dereference_protected(ifibss->presp,
259 lockdep_is_held(&sdata->wdev.mtx));
260 RCU_INIT_POINTER(ifibss->presp, NULL);
261 if (presp)
262 kfree_rcu(presp, rcu_head);
263
264 /* make a copy of the chandef, it could be modified below. */
265 chandef = *req_chandef;
266 chan = chandef.chan;
267 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
268 NL80211_IFTYPE_ADHOC)) {
269 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
270 chandef.width == NL80211_CHAN_WIDTH_10 ||
271 chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
272 chandef.width == NL80211_CHAN_WIDTH_20) {
273 sdata_info(sdata,
274 "Failed to join IBSS, beacons forbidden\n");
275 return;
276 }
277 chandef.width = NL80211_CHAN_WIDTH_20;
278 chandef.center_freq1 = chan->center_freq;
279 /* check again for downgraded chandef */
280 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
281 NL80211_IFTYPE_ADHOC)) {
282 sdata_info(sdata,
283 "Failed to join IBSS, beacons forbidden\n");
284 return;
285 }
286 }
287
288 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
289 &chandef, NL80211_IFTYPE_ADHOC);
290 if (err < 0) {
291 sdata_info(sdata,
292 "Failed to join IBSS, invalid chandef\n");
293 return;
294 }
295 if (err > 0 && !ifibss->userspace_handles_dfs) {
296 sdata_info(sdata,
297 "Failed to join IBSS, DFS channel without control program\n");
298 return;
299 }
300
301 radar_required = err;
302
303 mutex_lock(&local->mtx);
304 if (ieee80211_vif_use_channel(sdata, &chandef,
305 ifibss->fixed_channel ?
306 IEEE80211_CHANCTX_SHARED :
307 IEEE80211_CHANCTX_EXCLUSIVE)) {
308 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
309 mutex_unlock(&local->mtx);
310 return;
311 }
312 sdata->radar_required = radar_required;
313 mutex_unlock(&local->mtx);
314
315 memcpy(ifibss->bssid, bssid, ETH_ALEN);
316
317 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
318 capability, tsf, &chandef,
319 &have_higher_than_11mbit, NULL);
320 if (!presp)
321 return;
322
323 rcu_assign_pointer(ifibss->presp, presp);
324 mgmt = (void *)presp->head;
325
326 sdata->vif.bss_conf.enable_beacon = true;
327 sdata->vif.bss_conf.beacon_int = beacon_int;
328 sdata->vif.bss_conf.basic_rates = basic_rates;
329 sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
330 memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
331 bss_change = BSS_CHANGED_BEACON_INT;
332 bss_change |= ieee80211_reset_erp_info(sdata);
333 bss_change |= BSS_CHANGED_BSSID;
334 bss_change |= BSS_CHANGED_BEACON;
335 bss_change |= BSS_CHANGED_BEACON_ENABLED;
336 bss_change |= BSS_CHANGED_BASIC_RATES;
337 bss_change |= BSS_CHANGED_HT;
338 bss_change |= BSS_CHANGED_IBSS;
339 bss_change |= BSS_CHANGED_SSID;
340
341 /*
342 * In 5 GHz/802.11a, we can always use short slot time.
343 * (IEEE 802.11-2012 18.3.8.7)
344 *
345 * In 2.4GHz, we must always use long slots in IBSS for compatibility
346 * reasons.
347 * (IEEE 802.11-2012 19.4.5)
348 *
349 * HT follows these specifications (IEEE 802.11-2012 20.3.18)
350 */
351 sdata->vif.bss_conf.use_short_slot = chan->band == NL80211_BAND_5GHZ;
352 bss_change |= BSS_CHANGED_ERP_SLOT;
353
354 /* cf. IEEE 802.11 9.2.12 */
355 if (chan->band == NL80211_BAND_2GHZ && have_higher_than_11mbit)
356 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
357 else
358 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
359
360 ieee80211_set_wmm_default(sdata, true, false);
361
362 sdata->vif.bss_conf.ibss_joined = true;
363 sdata->vif.bss_conf.ibss_creator = creator;
364
365 err = drv_join_ibss(local, sdata);
366 if (err) {
367 sdata->vif.bss_conf.ibss_joined = false;
368 sdata->vif.bss_conf.ibss_creator = false;
369 sdata->vif.bss_conf.enable_beacon = false;
370 sdata->vif.bss_conf.ssid_len = 0;
371 RCU_INIT_POINTER(ifibss->presp, NULL);
372 kfree_rcu(presp, rcu_head);
373 mutex_lock(&local->mtx);
374 ieee80211_vif_release_channel(sdata);
375 mutex_unlock(&local->mtx);
376 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
377 err);
378 return;
379 }
380
381 ieee80211_bss_info_change_notify(sdata, bss_change);
382
383 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
384 mod_timer(&ifibss->timer,
385 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
386
387 bss_meta.chan = chan;
388 bss_meta.scan_width = cfg80211_chandef_to_scan_width(&chandef);
389 bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt,
390 presp->head_len, GFP_KERNEL);
391
392 cfg80211_put_bss(local->hw.wiphy, bss);
393 netif_carrier_on(sdata->dev);
394 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
395 }
396
397 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
398 struct ieee80211_bss *bss)
399 {
400 struct cfg80211_bss *cbss =
401 container_of((void *)bss, struct cfg80211_bss, priv);
402 struct ieee80211_supported_band *sband;
403 struct cfg80211_chan_def chandef;
404 u32 basic_rates;
405 int i, j;
406 u16 beacon_int = cbss->beacon_interval;
407 const struct cfg80211_bss_ies *ies;
408 enum nl80211_channel_type chan_type;
409 u64 tsf;
410 u32 rate_flags;
411 int shift;
412
413 sdata_assert_lock(sdata);
414
415 if (beacon_int < 10)
416 beacon_int = 10;
417
418 switch (sdata->u.ibss.chandef.width) {
419 case NL80211_CHAN_WIDTH_20_NOHT:
420 case NL80211_CHAN_WIDTH_20:
421 case NL80211_CHAN_WIDTH_40:
422 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
423 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
424 break;
425 case NL80211_CHAN_WIDTH_5:
426 case NL80211_CHAN_WIDTH_10:
427 cfg80211_chandef_create(&chandef, cbss->channel,
428 NL80211_CHAN_NO_HT);
429 chandef.width = sdata->u.ibss.chandef.width;
430 break;
431 case NL80211_CHAN_WIDTH_80:
432 case NL80211_CHAN_WIDTH_80P80:
433 case NL80211_CHAN_WIDTH_160:
434 chandef = sdata->u.ibss.chandef;
435 chandef.chan = cbss->channel;
436 break;
437 default:
438 /* fall back to 20 MHz for unsupported modes */
439 cfg80211_chandef_create(&chandef, cbss->channel,
440 NL80211_CHAN_NO_HT);
441 break;
442 }
443
444 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
445 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
446 shift = ieee80211_vif_get_shift(&sdata->vif);
447
448 basic_rates = 0;
449
450 for (i = 0; i < bss->supp_rates_len; i++) {
451 int rate = bss->supp_rates[i] & 0x7f;
452 bool is_basic = !!(bss->supp_rates[i] & 0x80);
453
454 for (j = 0; j < sband->n_bitrates; j++) {
455 int brate;
456 if ((rate_flags & sband->bitrates[j].flags)
457 != rate_flags)
458 continue;
459
460 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
461 5 * (1 << shift));
462 if (brate == rate) {
463 if (is_basic)
464 basic_rates |= BIT(j);
465 break;
466 }
467 }
468 }
469
470 rcu_read_lock();
471 ies = rcu_dereference(cbss->ies);
472 tsf = ies->tsf;
473 rcu_read_unlock();
474
475 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
476 beacon_int,
477 &chandef,
478 basic_rates,
479 cbss->capability,
480 tsf, false);
481 }
482
483 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
484 struct cfg80211_csa_settings *csa_settings)
485 {
486 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
487 struct beacon_data *presp, *old_presp;
488 struct cfg80211_bss *cbss;
489 const struct cfg80211_bss_ies *ies;
490 u16 capability = WLAN_CAPABILITY_IBSS;
491 u64 tsf;
492 int ret = 0;
493
494 sdata_assert_lock(sdata);
495
496 if (ifibss->privacy)
497 capability |= WLAN_CAPABILITY_PRIVACY;
498
499 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
500 ifibss->bssid, ifibss->ssid,
501 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS,
502 IEEE80211_PRIVACY(ifibss->privacy));
503
504 if (WARN_ON(!cbss)) {
505 ret = -EINVAL;
506 goto out;
507 }
508
509 rcu_read_lock();
510 ies = rcu_dereference(cbss->ies);
511 tsf = ies->tsf;
512 rcu_read_unlock();
513 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
514
515 old_presp = rcu_dereference_protected(ifibss->presp,
516 lockdep_is_held(&sdata->wdev.mtx));
517
518 presp = ieee80211_ibss_build_presp(sdata,
519 sdata->vif.bss_conf.beacon_int,
520 sdata->vif.bss_conf.basic_rates,
521 capability, tsf, &ifibss->chandef,
522 NULL, csa_settings);
523 if (!presp) {
524 ret = -ENOMEM;
525 goto out;
526 }
527
528 rcu_assign_pointer(ifibss->presp, presp);
529 if (old_presp)
530 kfree_rcu(old_presp, rcu_head);
531
532 return BSS_CHANGED_BEACON;
533 out:
534 return ret;
535 }
536
537 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
538 {
539 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
540 struct cfg80211_bss *cbss;
541
542 sdata_assert_lock(sdata);
543
544 /* update cfg80211 bss information with the new channel */
545 if (!is_zero_ether_addr(ifibss->bssid)) {
546 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
547 ifibss->chandef.chan,
548 ifibss->bssid, ifibss->ssid,
549 ifibss->ssid_len,
550 IEEE80211_BSS_TYPE_IBSS,
551 IEEE80211_PRIVACY(ifibss->privacy));
552 /* XXX: should not really modify cfg80211 data */
553 if (cbss) {
554 cbss->channel = sdata->csa_chandef.chan;
555 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
556 }
557 }
558
559 ifibss->chandef = sdata->csa_chandef;
560
561 /* generate the beacon */
562 return ieee80211_ibss_csa_beacon(sdata, NULL);
563 }
564
565 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
566 {
567 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
568
569 cancel_work_sync(&ifibss->csa_connection_drop_work);
570 }
571
572 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
573 __acquires(RCU)
574 {
575 struct ieee80211_sub_if_data *sdata = sta->sdata;
576 u8 addr[ETH_ALEN];
577
578 memcpy(addr, sta->sta.addr, ETH_ALEN);
579
580 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
581
582 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
583 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
584 /* authorize the station only if the network is not RSN protected. If
585 * not wait for the userspace to authorize it */
586 if (!sta->sdata->u.ibss.control_port)
587 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
588
589 rate_control_rate_init(sta);
590
591 /* If it fails, maybe we raced another insertion? */
592 if (sta_info_insert_rcu(sta))
593 return sta_info_get(sdata, addr);
594 return sta;
595 }
596
597 static struct sta_info *
598 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
599 const u8 *addr, u32 supp_rates)
600 __acquires(RCU)
601 {
602 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
603 struct ieee80211_local *local = sdata->local;
604 struct sta_info *sta;
605 struct ieee80211_chanctx_conf *chanctx_conf;
606 struct ieee80211_supported_band *sband;
607 enum nl80211_bss_scan_width scan_width;
608 int band;
609
610 /*
611 * XXX: Consider removing the least recently used entry and
612 * allow new one to be added.
613 */
614 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
615 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
616 sdata->name, addr);
617 rcu_read_lock();
618 return NULL;
619 }
620
621 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
622 rcu_read_lock();
623 return NULL;
624 }
625
626 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
627 rcu_read_lock();
628 return NULL;
629 }
630
631 rcu_read_lock();
632 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
633 if (WARN_ON_ONCE(!chanctx_conf))
634 return NULL;
635 band = chanctx_conf->def.chan->band;
636 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
637 rcu_read_unlock();
638
639 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
640 if (!sta) {
641 rcu_read_lock();
642 return NULL;
643 }
644
645 /* make sure mandatory rates are always added */
646 sband = local->hw.wiphy->bands[band];
647 sta->sta.supp_rates[band] = supp_rates |
648 ieee80211_mandatory_rates(sband, scan_width);
649
650 return ieee80211_ibss_finish_sta(sta);
651 }
652
653 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
654 {
655 struct ieee80211_local *local = sdata->local;
656 int active = 0;
657 struct sta_info *sta;
658
659 sdata_assert_lock(sdata);
660
661 rcu_read_lock();
662
663 list_for_each_entry_rcu(sta, &local->sta_list, list) {
664 unsigned long last_active = ieee80211_sta_last_active(sta);
665
666 if (sta->sdata == sdata &&
667 time_is_after_jiffies(last_active +
668 IEEE80211_IBSS_MERGE_INTERVAL)) {
669 active++;
670 break;
671 }
672 }
673
674 rcu_read_unlock();
675
676 return active;
677 }
678
679 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
680 {
681 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
682 struct ieee80211_local *local = sdata->local;
683 struct cfg80211_bss *cbss;
684 struct beacon_data *presp;
685 struct sta_info *sta;
686
687 if (!is_zero_ether_addr(ifibss->bssid)) {
688 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
689 ifibss->bssid, ifibss->ssid,
690 ifibss->ssid_len,
691 IEEE80211_BSS_TYPE_IBSS,
692 IEEE80211_PRIVACY(ifibss->privacy));
693
694 if (cbss) {
695 cfg80211_unlink_bss(local->hw.wiphy, cbss);
696 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
697 }
698 }
699
700 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
701
702 sta_info_flush(sdata);
703
704 spin_lock_bh(&ifibss->incomplete_lock);
705 while (!list_empty(&ifibss->incomplete_stations)) {
706 sta = list_first_entry(&ifibss->incomplete_stations,
707 struct sta_info, list);
708 list_del(&sta->list);
709 spin_unlock_bh(&ifibss->incomplete_lock);
710
711 sta_info_free(local, sta);
712 spin_lock_bh(&ifibss->incomplete_lock);
713 }
714 spin_unlock_bh(&ifibss->incomplete_lock);
715
716 netif_carrier_off(sdata->dev);
717
718 sdata->vif.bss_conf.ibss_joined = false;
719 sdata->vif.bss_conf.ibss_creator = false;
720 sdata->vif.bss_conf.enable_beacon = false;
721 sdata->vif.bss_conf.ssid_len = 0;
722
723 /* remove beacon */
724 presp = rcu_dereference_protected(ifibss->presp,
725 lockdep_is_held(&sdata->wdev.mtx));
726 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
727 if (presp)
728 kfree_rcu(presp, rcu_head);
729
730 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
731 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
732 BSS_CHANGED_IBSS);
733 drv_leave_ibss(local, sdata);
734 mutex_lock(&local->mtx);
735 ieee80211_vif_release_channel(sdata);
736 mutex_unlock(&local->mtx);
737 }
738
739 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
740 {
741 struct ieee80211_sub_if_data *sdata =
742 container_of(work, struct ieee80211_sub_if_data,
743 u.ibss.csa_connection_drop_work);
744
745 sdata_lock(sdata);
746
747 ieee80211_ibss_disconnect(sdata);
748 synchronize_rcu();
749 skb_queue_purge(&sdata->skb_queue);
750
751 /* trigger a scan to find another IBSS network to join */
752 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
753
754 sdata_unlock(sdata);
755 }
756
757 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
758 {
759 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
760 int err;
761
762 /* if the current channel is a DFS channel, mark the channel as
763 * unavailable.
764 */
765 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
766 &ifibss->chandef,
767 NL80211_IFTYPE_ADHOC);
768 if (err > 0)
769 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
770 GFP_ATOMIC);
771 }
772
773 static bool
774 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
775 struct ieee802_11_elems *elems,
776 bool beacon)
777 {
778 struct cfg80211_csa_settings params;
779 struct ieee80211_csa_ie csa_ie;
780 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
781 enum nl80211_channel_type ch_type;
782 int err;
783 u32 sta_flags;
784
785 sdata_assert_lock(sdata);
786
787 sta_flags = IEEE80211_STA_DISABLE_VHT;
788 switch (ifibss->chandef.width) {
789 case NL80211_CHAN_WIDTH_5:
790 case NL80211_CHAN_WIDTH_10:
791 case NL80211_CHAN_WIDTH_20_NOHT:
792 sta_flags |= IEEE80211_STA_DISABLE_HT;
793 /* fall through */
794 case NL80211_CHAN_WIDTH_20:
795 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
796 break;
797 default:
798 break;
799 }
800
801 memset(&params, 0, sizeof(params));
802 err = ieee80211_parse_ch_switch_ie(sdata, elems,
803 ifibss->chandef.chan->band,
804 sta_flags, ifibss->bssid, &csa_ie);
805 /* can't switch to destination channel, fail */
806 if (err < 0)
807 goto disconnect;
808
809 /* did not contain a CSA */
810 if (err)
811 return false;
812
813 /* channel switch is not supported, disconnect */
814 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
815 goto disconnect;
816
817 params.count = csa_ie.count;
818 params.chandef = csa_ie.chandef;
819
820 switch (ifibss->chandef.width) {
821 case NL80211_CHAN_WIDTH_20_NOHT:
822 case NL80211_CHAN_WIDTH_20:
823 case NL80211_CHAN_WIDTH_40:
824 /* keep our current HT mode (HT20/HT40+/HT40-), even if
825 * another mode has been announced. The mode is not adopted
826 * within the beacon while doing CSA and we should therefore
827 * keep the mode which we announce.
828 */
829 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
830 cfg80211_chandef_create(&params.chandef, params.chandef.chan,
831 ch_type);
832 break;
833 case NL80211_CHAN_WIDTH_5:
834 case NL80211_CHAN_WIDTH_10:
835 if (params.chandef.width != ifibss->chandef.width) {
836 sdata_info(sdata,
837 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
838 ifibss->bssid,
839 params.chandef.chan->center_freq,
840 params.chandef.width,
841 params.chandef.center_freq1,
842 params.chandef.center_freq2);
843 goto disconnect;
844 }
845 break;
846 default:
847 /* should not happen, sta_flags should prevent VHT modes. */
848 WARN_ON(1);
849 goto disconnect;
850 }
851
852 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
853 NL80211_IFTYPE_ADHOC)) {
854 sdata_info(sdata,
855 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
856 ifibss->bssid,
857 params.chandef.chan->center_freq,
858 params.chandef.width,
859 params.chandef.center_freq1,
860 params.chandef.center_freq2);
861 goto disconnect;
862 }
863
864 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
865 &params.chandef,
866 NL80211_IFTYPE_ADHOC);
867 if (err < 0)
868 goto disconnect;
869 if (err > 0 && !ifibss->userspace_handles_dfs) {
870 /* IBSS-DFS only allowed with a control program */
871 goto disconnect;
872 }
873
874 params.radar_required = err;
875
876 if (cfg80211_chandef_identical(&params.chandef,
877 &sdata->vif.bss_conf.chandef)) {
878 ibss_dbg(sdata,
879 "received csa with an identical chandef, ignoring\n");
880 return true;
881 }
882
883 /* all checks done, now perform the channel switch. */
884 ibss_dbg(sdata,
885 "received channel switch announcement to go to channel %d MHz\n",
886 params.chandef.chan->center_freq);
887
888 params.block_tx = !!csa_ie.mode;
889
890 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
891 &params))
892 goto disconnect;
893
894 ieee80211_ibss_csa_mark_radar(sdata);
895
896 return true;
897 disconnect:
898 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
899 ieee80211_queue_work(&sdata->local->hw,
900 &ifibss->csa_connection_drop_work);
901
902 ieee80211_ibss_csa_mark_radar(sdata);
903
904 return true;
905 }
906
907 static void
908 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
909 struct ieee80211_mgmt *mgmt, size_t len,
910 struct ieee80211_rx_status *rx_status,
911 struct ieee802_11_elems *elems)
912 {
913 int required_len;
914
915 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
916 return;
917
918 /* CSA is the only action we handle for now */
919 if (mgmt->u.action.u.measurement.action_code !=
920 WLAN_ACTION_SPCT_CHL_SWITCH)
921 return;
922
923 required_len = IEEE80211_MIN_ACTION_SIZE +
924 sizeof(mgmt->u.action.u.chan_switch);
925 if (len < required_len)
926 return;
927
928 if (!sdata->vif.csa_active)
929 ieee80211_ibss_process_chanswitch(sdata, elems, false);
930 }
931
932 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
933 struct ieee80211_mgmt *mgmt,
934 size_t len)
935 {
936 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
937
938 if (len < IEEE80211_DEAUTH_FRAME_LEN)
939 return;
940
941 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
942 ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason);
943 sta_info_destroy_addr(sdata, mgmt->sa);
944 }
945
946 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
947 struct ieee80211_mgmt *mgmt,
948 size_t len)
949 {
950 u16 auth_alg, auth_transaction;
951
952 sdata_assert_lock(sdata);
953
954 if (len < 24 + 6)
955 return;
956
957 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
958 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
959
960 ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
961 ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n",
962 mgmt->bssid, auth_transaction);
963
964 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
965 return;
966
967 /*
968 * IEEE 802.11 standard does not require authentication in IBSS
969 * networks and most implementations do not seem to use it.
970 * However, try to reply to authentication attempts if someone
971 * has actually implemented this.
972 */
973 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
974 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
975 }
976
977 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
978 struct ieee80211_mgmt *mgmt, size_t len,
979 struct ieee80211_rx_status *rx_status,
980 struct ieee802_11_elems *elems,
981 struct ieee80211_channel *channel)
982 {
983 struct sta_info *sta;
984 enum nl80211_band band = rx_status->band;
985 enum nl80211_bss_scan_width scan_width;
986 struct ieee80211_local *local = sdata->local;
987 struct ieee80211_supported_band *sband;
988 bool rates_updated = false;
989 u32 supp_rates = 0;
990
991 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
992 return;
993
994 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
995 return;
996
997 sband = local->hw.wiphy->bands[band];
998 if (WARN_ON(!sband))
999 return;
1000
1001 rcu_read_lock();
1002 sta = sta_info_get(sdata, mgmt->sa);
1003
1004 if (elems->supp_rates) {
1005 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1006 band, NULL);
1007 if (sta) {
1008 u32 prev_rates;
1009
1010 prev_rates = sta->sta.supp_rates[band];
1011 /* make sure mandatory rates are always added */
1012 scan_width = NL80211_BSS_CHAN_WIDTH_20;
1013 if (rx_status->bw == RATE_INFO_BW_5)
1014 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1015 else if (rx_status->bw == RATE_INFO_BW_10)
1016 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1017
1018 sta->sta.supp_rates[band] = supp_rates |
1019 ieee80211_mandatory_rates(sband, scan_width);
1020 if (sta->sta.supp_rates[band] != prev_rates) {
1021 ibss_dbg(sdata,
1022 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1023 sta->sta.addr, prev_rates,
1024 sta->sta.supp_rates[band]);
1025 rates_updated = true;
1026 }
1027 } else {
1028 rcu_read_unlock();
1029 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1030 mgmt->sa, supp_rates);
1031 }
1032 }
1033
1034 if (sta && !sta->sta.wme &&
1035 elems->wmm_info && local->hw.queues >= IEEE80211_NUM_ACS) {
1036 sta->sta.wme = true;
1037 ieee80211_check_fast_xmit(sta);
1038 }
1039
1040 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1041 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1042 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1043 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1044 /* we both use HT */
1045 struct ieee80211_ht_cap htcap_ie;
1046 struct cfg80211_chan_def chandef;
1047 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
1048
1049 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT);
1050 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef);
1051
1052 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1053 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1054 &htcap_ie,
1055 sta);
1056
1057 if (elems->vht_operation && elems->vht_cap_elem &&
1058 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1059 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1060 /* we both use VHT */
1061 struct ieee80211_vht_cap cap_ie;
1062 struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap;
1063
1064 ieee80211_chandef_vht_oper(&local->hw,
1065 elems->vht_operation,
1066 elems->ht_operation,
1067 &chandef);
1068 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1069 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1070 &cap_ie, sta);
1071 if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap)))
1072 rates_updated |= true;
1073 }
1074
1075 if (bw != sta->sta.bandwidth)
1076 rates_updated |= true;
1077
1078 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1079 &chandef))
1080 WARN_ON_ONCE(1);
1081 }
1082
1083 if (sta && rates_updated) {
1084 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1085 u8 rx_nss = sta->sta.rx_nss;
1086
1087 /* Force rx_nss recalculation */
1088 sta->sta.rx_nss = 0;
1089 rate_control_rate_init(sta);
1090 if (sta->sta.rx_nss != rx_nss)
1091 changed |= IEEE80211_RC_NSS_CHANGED;
1092
1093 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1094 }
1095
1096 rcu_read_unlock();
1097 }
1098
1099 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1100 struct ieee80211_mgmt *mgmt, size_t len,
1101 struct ieee80211_rx_status *rx_status,
1102 struct ieee802_11_elems *elems)
1103 {
1104 struct ieee80211_local *local = sdata->local;
1105 struct cfg80211_bss *cbss;
1106 struct ieee80211_bss *bss;
1107 struct ieee80211_channel *channel;
1108 u64 beacon_timestamp, rx_timestamp;
1109 u32 supp_rates = 0;
1110 enum nl80211_band band = rx_status->band;
1111
1112 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1113 if (!channel)
1114 return;
1115
1116 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1117
1118 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel);
1119 if (!bss)
1120 return;
1121
1122 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1123
1124 /* same for beacon and probe response */
1125 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1126
1127 /* check if we need to merge IBSS */
1128
1129 /* not an IBSS */
1130 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1131 goto put_bss;
1132
1133 /* different channel */
1134 if (sdata->u.ibss.fixed_channel &&
1135 sdata->u.ibss.chandef.chan != cbss->channel)
1136 goto put_bss;
1137
1138 /* different SSID */
1139 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1140 memcmp(elems->ssid, sdata->u.ibss.ssid,
1141 sdata->u.ibss.ssid_len))
1142 goto put_bss;
1143
1144 /* process channel switch */
1145 if (sdata->vif.csa_active ||
1146 ieee80211_ibss_process_chanswitch(sdata, elems, true))
1147 goto put_bss;
1148
1149 /* same BSSID */
1150 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1151 goto put_bss;
1152
1153 /* we use a fixed BSSID */
1154 if (sdata->u.ibss.fixed_bssid)
1155 goto put_bss;
1156
1157 if (ieee80211_have_rx_timestamp(rx_status)) {
1158 /* time when timestamp field was received */
1159 rx_timestamp =
1160 ieee80211_calculate_rx_timestamp(local, rx_status,
1161 len + FCS_LEN, 24);
1162 } else {
1163 /*
1164 * second best option: get current TSF
1165 * (will return -1 if not supported)
1166 */
1167 rx_timestamp = drv_get_tsf(local, sdata);
1168 }
1169
1170 ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n",
1171 mgmt->sa, mgmt->bssid,
1172 (unsigned long long)rx_timestamp);
1173 ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n",
1174 (unsigned long long)beacon_timestamp,
1175 (unsigned long long)(rx_timestamp - beacon_timestamp),
1176 jiffies);
1177
1178 if (beacon_timestamp > rx_timestamp) {
1179 ibss_dbg(sdata,
1180 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1181 mgmt->bssid);
1182 ieee80211_sta_join_ibss(sdata, bss);
1183 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1184 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1185 supp_rates);
1186 rcu_read_unlock();
1187 }
1188
1189 put_bss:
1190 ieee80211_rx_bss_put(local, bss);
1191 }
1192
1193 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1194 const u8 *bssid, const u8 *addr,
1195 u32 supp_rates)
1196 {
1197 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1198 struct ieee80211_local *local = sdata->local;
1199 struct sta_info *sta;
1200 struct ieee80211_chanctx_conf *chanctx_conf;
1201 struct ieee80211_supported_band *sband;
1202 enum nl80211_bss_scan_width scan_width;
1203 int band;
1204
1205 /*
1206 * XXX: Consider removing the least recently used entry and
1207 * allow new one to be added.
1208 */
1209 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1210 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1211 sdata->name, addr);
1212 return;
1213 }
1214
1215 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1216 return;
1217
1218 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1219 return;
1220
1221 rcu_read_lock();
1222 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1223 if (WARN_ON_ONCE(!chanctx_conf)) {
1224 rcu_read_unlock();
1225 return;
1226 }
1227 band = chanctx_conf->def.chan->band;
1228 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1229 rcu_read_unlock();
1230
1231 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1232 if (!sta)
1233 return;
1234
1235 /* make sure mandatory rates are always added */
1236 sband = local->hw.wiphy->bands[band];
1237 sta->sta.supp_rates[band] = supp_rates |
1238 ieee80211_mandatory_rates(sband, scan_width);
1239
1240 spin_lock(&ifibss->incomplete_lock);
1241 list_add(&sta->list, &ifibss->incomplete_stations);
1242 spin_unlock(&ifibss->incomplete_lock);
1243 ieee80211_queue_work(&local->hw, &sdata->work);
1244 }
1245
1246 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1247 {
1248 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1249 struct ieee80211_local *local = sdata->local;
1250 struct sta_info *sta, *tmp;
1251 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1252 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1253
1254 mutex_lock(&local->sta_mtx);
1255
1256 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1257 unsigned long last_active = ieee80211_sta_last_active(sta);
1258
1259 if (sdata != sta->sdata)
1260 continue;
1261
1262 if (time_is_before_jiffies(last_active + exp_time) ||
1263 (time_is_before_jiffies(last_active + exp_rsn) &&
1264 sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1265 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
1266
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 ieee80211_send_deauth_disassoc(sdata, sta->sta.addr,
1272 ifibss->bssid,
1273 IEEE80211_STYPE_DEAUTH,
1274 WLAN_REASON_DEAUTH_LEAVING,
1275 true, frame_buf);
1276 WARN_ON(__sta_info_destroy(sta));
1277 }
1278 }
1279
1280 mutex_unlock(&local->sta_mtx);
1281 }
1282
1283 /*
1284 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1285 */
1286
1287 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1288 {
1289 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1290 enum nl80211_bss_scan_width scan_width;
1291
1292 sdata_assert_lock(sdata);
1293
1294 mod_timer(&ifibss->timer,
1295 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1296
1297 ieee80211_ibss_sta_expire(sdata);
1298
1299 if (time_before(jiffies, ifibss->last_scan_completed +
1300 IEEE80211_IBSS_MERGE_INTERVAL))
1301 return;
1302
1303 if (ieee80211_sta_active_ibss(sdata))
1304 return;
1305
1306 if (ifibss->fixed_channel)
1307 return;
1308
1309 sdata_info(sdata,
1310 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1311
1312 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1313 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1314 NULL, 0, scan_width);
1315 }
1316
1317 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1318 {
1319 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1320 u8 bssid[ETH_ALEN];
1321 u16 capability;
1322 int i;
1323
1324 sdata_assert_lock(sdata);
1325
1326 if (ifibss->fixed_bssid) {
1327 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1328 } else {
1329 /* Generate random, not broadcast, locally administered BSSID. Mix in
1330 * own MAC address to make sure that devices that do not have proper
1331 * random number generator get different BSSID. */
1332 get_random_bytes(bssid, ETH_ALEN);
1333 for (i = 0; i < ETH_ALEN; i++)
1334 bssid[i] ^= sdata->vif.addr[i];
1335 bssid[0] &= ~0x01;
1336 bssid[0] |= 0x02;
1337 }
1338
1339 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1340
1341 capability = WLAN_CAPABILITY_IBSS;
1342
1343 if (ifibss->privacy)
1344 capability |= WLAN_CAPABILITY_PRIVACY;
1345
1346 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1347 &ifibss->chandef, ifibss->basic_rates,
1348 capability, 0, true);
1349 }
1350
1351 static unsigned ibss_setup_channels(struct wiphy *wiphy,
1352 struct ieee80211_channel **channels,
1353 unsigned int channels_max,
1354 u32 center_freq, u32 width)
1355 {
1356 struct ieee80211_channel *chan = NULL;
1357 unsigned int n_chan = 0;
1358 u32 start_freq, end_freq, freq;
1359
1360 if (width <= 20) {
1361 start_freq = center_freq;
1362 end_freq = center_freq;
1363 } else {
1364 start_freq = center_freq - width / 2 + 10;
1365 end_freq = center_freq + width / 2 - 10;
1366 }
1367
1368 for (freq = start_freq; freq <= end_freq; freq += 20) {
1369 chan = ieee80211_get_channel(wiphy, freq);
1370 if (!chan)
1371 continue;
1372 if (n_chan >= channels_max)
1373 return n_chan;
1374
1375 channels[n_chan] = chan;
1376 n_chan++;
1377 }
1378
1379 return n_chan;
1380 }
1381
1382 static unsigned int
1383 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1384 const struct cfg80211_chan_def *chandef,
1385 struct ieee80211_channel **channels,
1386 unsigned int channels_max)
1387 {
1388 unsigned int n_chan = 0;
1389 u32 width, cf1, cf2 = 0;
1390
1391 switch (chandef->width) {
1392 case NL80211_CHAN_WIDTH_40:
1393 width = 40;
1394 break;
1395 case NL80211_CHAN_WIDTH_80P80:
1396 cf2 = chandef->center_freq2;
1397 /* fall through */
1398 case NL80211_CHAN_WIDTH_80:
1399 width = 80;
1400 break;
1401 case NL80211_CHAN_WIDTH_160:
1402 width = 160;
1403 break;
1404 default:
1405 width = 20;
1406 break;
1407 }
1408
1409 cf1 = chandef->center_freq1;
1410
1411 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1412
1413 if (cf2)
1414 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1415 channels_max - n_chan, cf2,
1416 width);
1417
1418 return n_chan;
1419 }
1420
1421 /*
1422 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1423 */
1424
1425 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1426 {
1427 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1428 struct ieee80211_local *local = sdata->local;
1429 struct cfg80211_bss *cbss;
1430 struct ieee80211_channel *chan = NULL;
1431 const u8 *bssid = NULL;
1432 enum nl80211_bss_scan_width scan_width;
1433 int active_ibss;
1434
1435 sdata_assert_lock(sdata);
1436
1437 active_ibss = ieee80211_sta_active_ibss(sdata);
1438 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1439
1440 if (active_ibss)
1441 return;
1442
1443 if (ifibss->fixed_bssid)
1444 bssid = ifibss->bssid;
1445 if (ifibss->fixed_channel)
1446 chan = ifibss->chandef.chan;
1447 if (!is_zero_ether_addr(ifibss->bssid))
1448 bssid = ifibss->bssid;
1449 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1450 ifibss->ssid, ifibss->ssid_len,
1451 IEEE80211_BSS_TYPE_IBSS,
1452 IEEE80211_PRIVACY(ifibss->privacy));
1453
1454 if (cbss) {
1455 struct ieee80211_bss *bss;
1456
1457 bss = (void *)cbss->priv;
1458 ibss_dbg(sdata,
1459 "sta_find_ibss: selected %pM current %pM\n",
1460 cbss->bssid, ifibss->bssid);
1461 sdata_info(sdata,
1462 "Selected IBSS BSSID %pM based on configured SSID\n",
1463 cbss->bssid);
1464
1465 ieee80211_sta_join_ibss(sdata, bss);
1466 ieee80211_rx_bss_put(local, bss);
1467 return;
1468 }
1469
1470 /* if a fixed bssid and a fixed freq have been provided create the IBSS
1471 * directly and do not waste time scanning
1472 */
1473 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1474 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1475 bssid);
1476 ieee80211_sta_create_ibss(sdata);
1477 return;
1478 }
1479
1480
1481 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1482
1483 /* Selected IBSS not found in current scan results - try to scan */
1484 if (time_after(jiffies, ifibss->last_scan_completed +
1485 IEEE80211_SCAN_INTERVAL)) {
1486 struct ieee80211_channel *channels[8];
1487 unsigned int num;
1488
1489 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1490
1491 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1492
1493 if (ifibss->fixed_channel) {
1494 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1495 &ifibss->chandef,
1496 channels,
1497 ARRAY_SIZE(channels));
1498 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1499 ifibss->ssid_len, channels,
1500 num, scan_width);
1501 } else {
1502 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1503 ifibss->ssid_len, NULL,
1504 0, scan_width);
1505 }
1506 } else {
1507 int interval = IEEE80211_SCAN_INTERVAL;
1508
1509 if (time_after(jiffies, ifibss->ibss_join_req +
1510 IEEE80211_IBSS_JOIN_TIMEOUT))
1511 ieee80211_sta_create_ibss(sdata);
1512
1513 mod_timer(&ifibss->timer,
1514 round_jiffies(jiffies + interval));
1515 }
1516 }
1517
1518 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1519 struct sk_buff *req)
1520 {
1521 struct ieee80211_mgmt *mgmt = (void *)req->data;
1522 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1523 struct ieee80211_local *local = sdata->local;
1524 int tx_last_beacon, len = req->len;
1525 struct sk_buff *skb;
1526 struct beacon_data *presp;
1527 u8 *pos, *end;
1528
1529 sdata_assert_lock(sdata);
1530
1531 presp = rcu_dereference_protected(ifibss->presp,
1532 lockdep_is_held(&sdata->wdev.mtx));
1533
1534 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1535 len < 24 + 2 || !presp)
1536 return;
1537
1538 tx_last_beacon = drv_tx_last_beacon(local);
1539
1540 ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
1541 ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n",
1542 mgmt->bssid, tx_last_beacon);
1543
1544 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1545 return;
1546
1547 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1548 !is_broadcast_ether_addr(mgmt->bssid))
1549 return;
1550
1551 end = ((u8 *) mgmt) + len;
1552 pos = mgmt->u.probe_req.variable;
1553 if (pos[0] != WLAN_EID_SSID ||
1554 pos + 2 + pos[1] > end) {
1555 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1556 mgmt->sa);
1557 return;
1558 }
1559 if (pos[1] != 0 &&
1560 (pos[1] != ifibss->ssid_len ||
1561 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1562 /* Ignore ProbeReq for foreign SSID */
1563 return;
1564 }
1565
1566 /* Reply with ProbeResp */
1567 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1568 if (!skb)
1569 return;
1570
1571 skb_reserve(skb, local->tx_headroom);
1572 skb_put_data(skb, presp->head, presp->head_len);
1573
1574 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1575 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1576 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1577
1578 /* avoid excessive retries for probe request to wildcard SSIDs */
1579 if (pos[1] == 0)
1580 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1581
1582 ieee80211_tx_skb(sdata, skb);
1583 }
1584
1585 static
1586 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1587 struct ieee80211_mgmt *mgmt, size_t len,
1588 struct ieee80211_rx_status *rx_status)
1589 {
1590 size_t baselen;
1591 struct ieee802_11_elems elems;
1592
1593 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1594 offsetof(typeof(mgmt->u.beacon), variable));
1595
1596 /*
1597 * either beacon or probe_resp but the variable field is at the
1598 * same offset
1599 */
1600 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1601 if (baselen > len)
1602 return;
1603
1604 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1605 false, &elems, mgmt->bssid, NULL);
1606
1607 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1608 }
1609
1610 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1611 struct sk_buff *skb)
1612 {
1613 struct ieee80211_rx_status *rx_status;
1614 struct ieee80211_mgmt *mgmt;
1615 u16 fc;
1616 struct ieee802_11_elems elems;
1617 int ies_len;
1618
1619 rx_status = IEEE80211_SKB_RXCB(skb);
1620 mgmt = (struct ieee80211_mgmt *) skb->data;
1621 fc = le16_to_cpu(mgmt->frame_control);
1622
1623 sdata_lock(sdata);
1624
1625 if (!sdata->u.ibss.ssid_len)
1626 goto mgmt_out; /* not ready to merge yet */
1627
1628 switch (fc & IEEE80211_FCTL_STYPE) {
1629 case IEEE80211_STYPE_PROBE_REQ:
1630 ieee80211_rx_mgmt_probe_req(sdata, skb);
1631 break;
1632 case IEEE80211_STYPE_PROBE_RESP:
1633 case IEEE80211_STYPE_BEACON:
1634 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1635 rx_status);
1636 break;
1637 case IEEE80211_STYPE_AUTH:
1638 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1639 break;
1640 case IEEE80211_STYPE_DEAUTH:
1641 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1642 break;
1643 case IEEE80211_STYPE_ACTION:
1644 switch (mgmt->u.action.category) {
1645 case WLAN_CATEGORY_SPECTRUM_MGMT:
1646 ies_len = skb->len -
1647 offsetof(struct ieee80211_mgmt,
1648 u.action.u.chan_switch.variable);
1649
1650 if (ies_len < 0)
1651 break;
1652
1653 ieee802_11_parse_elems(
1654 mgmt->u.action.u.chan_switch.variable,
1655 ies_len, true, &elems, mgmt->bssid, NULL);
1656
1657 if (elems.parse_error)
1658 break;
1659
1660 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1661 rx_status, &elems);
1662 break;
1663 }
1664 }
1665
1666 mgmt_out:
1667 sdata_unlock(sdata);
1668 }
1669
1670 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1671 {
1672 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1673 struct sta_info *sta;
1674
1675 sdata_lock(sdata);
1676
1677 /*
1678 * Work could be scheduled after scan or similar
1679 * when we aren't even joined (or trying) with a
1680 * network.
1681 */
1682 if (!ifibss->ssid_len)
1683 goto out;
1684
1685 spin_lock_bh(&ifibss->incomplete_lock);
1686 while (!list_empty(&ifibss->incomplete_stations)) {
1687 sta = list_first_entry(&ifibss->incomplete_stations,
1688 struct sta_info, list);
1689 list_del(&sta->list);
1690 spin_unlock_bh(&ifibss->incomplete_lock);
1691
1692 ieee80211_ibss_finish_sta(sta);
1693 rcu_read_unlock();
1694 spin_lock_bh(&ifibss->incomplete_lock);
1695 }
1696 spin_unlock_bh(&ifibss->incomplete_lock);
1697
1698 switch (ifibss->state) {
1699 case IEEE80211_IBSS_MLME_SEARCH:
1700 ieee80211_sta_find_ibss(sdata);
1701 break;
1702 case IEEE80211_IBSS_MLME_JOINED:
1703 ieee80211_sta_merge_ibss(sdata);
1704 break;
1705 default:
1706 WARN_ON(1);
1707 break;
1708 }
1709
1710 out:
1711 sdata_unlock(sdata);
1712 }
1713
1714 static void ieee80211_ibss_timer(struct timer_list *t)
1715 {
1716 struct ieee80211_sub_if_data *sdata =
1717 from_timer(sdata, t, u.ibss.timer);
1718
1719 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1720 }
1721
1722 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1723 {
1724 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1725
1726 timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0);
1727 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1728 spin_lock_init(&ifibss->incomplete_lock);
1729 INIT_WORK(&ifibss->csa_connection_drop_work,
1730 ieee80211_csa_connection_drop_work);
1731 }
1732
1733 /* scan finished notification */
1734 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1735 {
1736 struct ieee80211_sub_if_data *sdata;
1737
1738 mutex_lock(&local->iflist_mtx);
1739 list_for_each_entry(sdata, &local->interfaces, list) {
1740 if (!ieee80211_sdata_running(sdata))
1741 continue;
1742 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1743 continue;
1744 sdata->u.ibss.last_scan_completed = jiffies;
1745 }
1746 mutex_unlock(&local->iflist_mtx);
1747 }
1748
1749 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1750 struct cfg80211_ibss_params *params)
1751 {
1752 u32 changed = 0;
1753 u32 rate_flags;
1754 struct ieee80211_supported_band *sband;
1755 enum ieee80211_chanctx_mode chanmode;
1756 struct ieee80211_local *local = sdata->local;
1757 int radar_detect_width = 0;
1758 int i;
1759 int ret;
1760
1761 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1762 &params->chandef,
1763 sdata->wdev.iftype);
1764 if (ret < 0)
1765 return ret;
1766
1767 if (ret > 0) {
1768 if (!params->userspace_handles_dfs)
1769 return -EINVAL;
1770 radar_detect_width = BIT(params->chandef.width);
1771 }
1772
1773 chanmode = (params->channel_fixed && !ret) ?
1774 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1775
1776 mutex_lock(&local->chanctx_mtx);
1777 ret = ieee80211_check_combinations(sdata, &params->chandef, chanmode,
1778 radar_detect_width);
1779 mutex_unlock(&local->chanctx_mtx);
1780 if (ret < 0)
1781 return ret;
1782
1783 if (params->bssid) {
1784 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1785 sdata->u.ibss.fixed_bssid = true;
1786 } else
1787 sdata->u.ibss.fixed_bssid = false;
1788
1789 sdata->u.ibss.privacy = params->privacy;
1790 sdata->u.ibss.control_port = params->control_port;
1791 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1792 sdata->u.ibss.basic_rates = params->basic_rates;
1793 sdata->u.ibss.last_scan_completed = jiffies;
1794
1795 /* fix basic_rates if channel does not support these rates */
1796 rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
1797 sband = local->hw.wiphy->bands[params->chandef.chan->band];
1798 for (i = 0; i < sband->n_bitrates; i++) {
1799 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1800 sdata->u.ibss.basic_rates &= ~BIT(i);
1801 }
1802 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1803 sizeof(params->mcast_rate));
1804
1805 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1806
1807 sdata->u.ibss.chandef = params->chandef;
1808 sdata->u.ibss.fixed_channel = params->channel_fixed;
1809
1810 if (params->ie) {
1811 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1812 GFP_KERNEL);
1813 if (sdata->u.ibss.ie)
1814 sdata->u.ibss.ie_len = params->ie_len;
1815 }
1816
1817 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1818 sdata->u.ibss.ibss_join_req = jiffies;
1819
1820 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1821 sdata->u.ibss.ssid_len = params->ssid_len;
1822
1823 memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1824 sizeof(sdata->u.ibss.ht_capa));
1825 memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1826 sizeof(sdata->u.ibss.ht_capa_mask));
1827
1828 /*
1829 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1830 * reserved, but an HT STA shall protect HT transmissions as though
1831 * the HT Protection field were set to non-HT mixed mode.
1832 *
1833 * In an IBSS, the RIFS Mode field of the HT Operation element is
1834 * also reserved, but an HT STA shall operate as though this field
1835 * were set to 1.
1836 */
1837
1838 sdata->vif.bss_conf.ht_operation_mode |=
1839 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1840 | IEEE80211_HT_PARAM_RIFS_MODE;
1841
1842 changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE;
1843 ieee80211_bss_info_change_notify(sdata, changed);
1844
1845 sdata->smps_mode = IEEE80211_SMPS_OFF;
1846 sdata->needed_rx_chains = local->rx_chains;
1847 sdata->control_port_over_nl80211 = params->control_port_over_nl80211;
1848
1849 ieee80211_queue_work(&local->hw, &sdata->work);
1850
1851 return 0;
1852 }
1853
1854 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1855 {
1856 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1857
1858 ieee80211_ibss_disconnect(sdata);
1859 ifibss->ssid_len = 0;
1860 eth_zero_addr(ifibss->bssid);
1861
1862 /* remove beacon */
1863 kfree(sdata->u.ibss.ie);
1864
1865 /* on the next join, re-program HT parameters */
1866 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1867 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1868
1869 synchronize_rcu();
1870
1871 skb_queue_purge(&sdata->skb_queue);
1872
1873 del_timer_sync(&sdata->u.ibss.timer);
1874
1875 return 0;
1876 }
Linux with added FPC-III support