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) 2018-2023 Intel Corporation
13 */
14
15#include <linux/delay.h>
16#include <linux/slab.h>
17#include <linux/if_ether.h>
18#include <linux/skbuff.h>
19#include <linux/if_arp.h>
20#include <linux/etherdevice.h>
21#include <linux/rtnetlink.h>
22#include <net/mac80211.h>
23
24#include "ieee80211_i.h"
25#include "driver-ops.h"
26#include "rate.h"
27
28#define IEEE80211_SCAN_INTERVAL (2 * HZ)
29#define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
30
31#define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
32#define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
33#define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ)
34
35#define IEEE80211_IBSS_MAX_STA_ENTRIES 128
36
37static struct beacon_data *
38ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata,
39 const int beacon_int, const u32 basic_rates,
40 const u16 capability, u64 tsf,
41 struct cfg80211_chan_def *chandef,
42 bool *have_higher_than_11mbit,
43 struct cfg80211_csa_settings *csa_settings)
44{
45 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
46 struct ieee80211_local *local = sdata->local;
47 int rates_n = 0, i, ri;
48 struct ieee80211_mgmt *mgmt;
49 u8 *pos;
50 struct ieee80211_supported_band *sband;
51 u32 rate_flags, rates = 0, rates_added = 0;
52 struct beacon_data *presp;
53 int frame_len;
54
55 /* Build IBSS probe response */
56 frame_len = sizeof(struct ieee80211_hdr_3addr) +
57 12 /* struct ieee80211_mgmt.u.beacon */ +
58 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
59 2 + 8 /* max Supported Rates */ +
60 3 /* max DS params */ +
61 4 /* IBSS params */ +
62 5 /* Channel Switch Announcement */ +
63 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
64 2 + sizeof(struct ieee80211_ht_cap) +
65 2 + sizeof(struct ieee80211_ht_operation) +
66 2 + sizeof(struct ieee80211_vht_cap) +
67 2 + sizeof(struct ieee80211_vht_operation) +
68 ifibss->ie_len;
69 presp = kzalloc(size: 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(addr: mgmt->da);
79 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
80 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
81 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
82 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
83 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
84
85 pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
86
87 *pos++ = WLAN_EID_SSID;
88 *pos++ = ifibss->ssid_len;
89 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
90 pos += ifibss->ssid_len;
91
92 sband = local->hw.wiphy->bands[chandef->chan->band];
93 rate_flags = ieee80211_chandef_rate_flags(chandef);
94 rates_n = 0;
95 if (have_higher_than_11mbit)
96 *have_higher_than_11mbit = false;
97
98 for (i = 0; i < sband->n_bitrates; i++) {
99 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
100 continue;
101 if (sband->bitrates[i].bitrate > 110 &&
102 have_higher_than_11mbit)
103 *have_higher_than_11mbit = true;
104
105 rates |= BIT(i);
106 rates_n++;
107 }
108
109 *pos++ = WLAN_EID_SUPP_RATES;
110 *pos++ = min_t(int, 8, rates_n);
111 for (ri = 0; ri < sband->n_bitrates; ri++) {
112 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 5);
113 u8 basic = 0;
114 if (!(rates & BIT(ri)))
115 continue;
116
117 if (basic_rates & BIT(ri))
118 basic = 0x80;
119 *pos++ = basic | (u8) rate;
120 if (++rates_added == 8) {
121 ri++; /* continue at next rate for EXT_SUPP_RATES */
122 break;
123 }
124 }
125
126 if (sband->band == NL80211_BAND_2GHZ) {
127 *pos++ = WLAN_EID_DS_PARAMS;
128 *pos++ = 1;
129 *pos++ = ieee80211_frequency_to_channel(
130 freq: chandef->chan->center_freq);
131 }
132
133 *pos++ = WLAN_EID_IBSS_PARAMS;
134 *pos++ = 2;
135 /* FIX: set ATIM window based on scan results */
136 *pos++ = 0;
137 *pos++ = 0;
138
139 if (csa_settings) {
140 *pos++ = WLAN_EID_CHANNEL_SWITCH;
141 *pos++ = 3;
142 *pos++ = csa_settings->block_tx ? 1 : 0;
143 *pos++ = ieee80211_frequency_to_channel(
144 freq: csa_settings->chandef.chan->center_freq);
145 presp->cntdwn_counter_offsets[0] = (pos - presp->head);
146 *pos++ = csa_settings->count;
147 presp->cntdwn_current_counter = csa_settings->count;
148 }
149
150 /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
151 if (rates_n > 8) {
152 *pos++ = WLAN_EID_EXT_SUPP_RATES;
153 *pos++ = rates_n - 8;
154 for (; ri < sband->n_bitrates; ri++) {
155 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 5);
156 u8 basic = 0;
157 if (!(rates & BIT(ri)))
158 continue;
159
160 if (basic_rates & BIT(ri))
161 basic = 0x80;
162 *pos++ = basic | (u8) rate;
163 }
164 }
165
166 if (ifibss->ie_len) {
167 memcpy(pos, ifibss->ie, ifibss->ie_len);
168 pos += ifibss->ie_len;
169 }
170
171 /* add HT capability and information IEs */
172 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
173 chandef->width != NL80211_CHAN_WIDTH_5 &&
174 chandef->width != NL80211_CHAN_WIDTH_10 &&
175 sband->ht_cap.ht_supported) {
176 struct ieee80211_sta_ht_cap ht_cap;
177
178 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
179 ieee80211_apply_htcap_overrides(sdata, ht_cap: &ht_cap);
180
181 pos = ieee80211_ie_build_ht_cap(pos, ht_cap: &ht_cap, cap: ht_cap.cap);
182 /*
183 * Note: According to 802.11n-2009 9.13.3.1, HT Protection
184 * field and RIFS Mode are reserved in IBSS mode, therefore
185 * keep them at 0
186 */
187 pos = ieee80211_ie_build_ht_oper(pos, ht_cap: &sband->ht_cap,
188 chandef, prot_mode: 0, rifs_mode: false);
189
190 /* add VHT capability and information IEs */
191 if (chandef->width != NL80211_CHAN_WIDTH_20 &&
192 chandef->width != NL80211_CHAN_WIDTH_40 &&
193 sband->vht_cap.vht_supported) {
194 pos = ieee80211_ie_build_vht_cap(pos, vht_cap: &sband->vht_cap,
195 cap: sband->vht_cap.cap);
196 pos = ieee80211_ie_build_vht_oper(pos, vht_cap: &sband->vht_cap,
197 chandef);
198 }
199 }
200
201 if (local->hw.queues >= IEEE80211_NUM_ACS)
202 pos = ieee80211_add_wmm_info_ie(buf: pos, qosinfo: 0); /* U-APSD not in use */
203
204 presp->head_len = pos - presp->head;
205 if (WARN_ON(presp->head_len > frame_len))
206 goto error;
207
208 return presp;
209error:
210 kfree(objp: presp);
211 return NULL;
212}
213
214static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
215 const u8 *bssid, const int beacon_int,
216 struct cfg80211_chan_def *req_chandef,
217 const u32 basic_rates,
218 const u16 capability, u64 tsf,
219 bool creator)
220{
221 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
222 struct ieee80211_local *local = sdata->local;
223 struct ieee80211_mgmt *mgmt;
224 struct cfg80211_bss *bss;
225 u64 bss_change;
226 struct cfg80211_chan_def chandef;
227 struct ieee80211_channel *chan;
228 struct beacon_data *presp;
229 struct cfg80211_inform_bss bss_meta = {};
230 bool have_higher_than_11mbit;
231 bool radar_required;
232 int err;
233
234 lockdep_assert_wiphy(local->hw.wiphy);
235
236 /* Reset own TSF to allow time synchronization work. */
237 drv_reset_tsf(local, sdata);
238
239 if (!ether_addr_equal(addr1: ifibss->bssid, addr2: bssid))
240 sta_info_flush(sdata);
241
242 /* if merging, indicate to driver that we leave the old IBSS */
243 if (sdata->vif.cfg.ibss_joined) {
244 sdata->vif.cfg.ibss_joined = false;
245 sdata->vif.cfg.ibss_creator = false;
246 sdata->vif.bss_conf.enable_beacon = false;
247 netif_carrier_off(dev: sdata->dev);
248 ieee80211_bss_info_change_notify(sdata,
249 changed: BSS_CHANGED_IBSS |
250 BSS_CHANGED_BEACON_ENABLED);
251 drv_leave_ibss(local, sdata);
252 }
253
254 presp = sdata_dereference(ifibss->presp, sdata);
255 RCU_INIT_POINTER(ifibss->presp, NULL);
256 if (presp)
257 kfree_rcu(presp, rcu_head);
258
259 /* make a copy of the chandef, it could be modified below. */
260 chandef = *req_chandef;
261 chan = chandef.chan;
262 if (!cfg80211_reg_can_beacon(wiphy: local->hw.wiphy, chandef: &chandef,
263 iftype: NL80211_IFTYPE_ADHOC)) {
264 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
265 chandef.width == NL80211_CHAN_WIDTH_10 ||
266 chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
267 chandef.width == NL80211_CHAN_WIDTH_20) {
268 sdata_info(sdata,
269 "Failed to join IBSS, beacons forbidden\n");
270 return;
271 }
272 chandef.width = NL80211_CHAN_WIDTH_20;
273 chandef.center_freq1 = chan->center_freq;
274 /* check again for downgraded chandef */
275 if (!cfg80211_reg_can_beacon(wiphy: local->hw.wiphy, chandef: &chandef,
276 iftype: NL80211_IFTYPE_ADHOC)) {
277 sdata_info(sdata,
278 "Failed to join IBSS, beacons forbidden\n");
279 return;
280 }
281 }
282
283 err = cfg80211_chandef_dfs_required(wiphy: sdata->local->hw.wiphy,
284 chandef: &chandef, iftype: NL80211_IFTYPE_ADHOC);
285 if (err < 0) {
286 sdata_info(sdata,
287 "Failed to join IBSS, invalid chandef\n");
288 return;
289 }
290 if (err > 0 && !ifibss->userspace_handles_dfs) {
291 sdata_info(sdata,
292 "Failed to join IBSS, DFS channel without control program\n");
293 return;
294 }
295
296 radar_required = err;
297
298 if (ieee80211_link_use_channel(link: &sdata->deflink, chandef: &chandef,
299 mode: ifibss->fixed_channel ?
300 IEEE80211_CHANCTX_SHARED :
301 IEEE80211_CHANCTX_EXCLUSIVE)) {
302 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
303 return;
304 }
305 sdata->deflink.radar_required = radar_required;
306
307 memcpy(ifibss->bssid, bssid, ETH_ALEN);
308
309 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
310 capability, tsf, chandef: &chandef,
311 have_higher_than_11mbit: &have_higher_than_11mbit, NULL);
312 if (!presp)
313 return;
314
315 rcu_assign_pointer(ifibss->presp, presp);
316 mgmt = (void *)presp->head;
317
318 sdata->vif.bss_conf.enable_beacon = true;
319 sdata->vif.bss_conf.beacon_int = beacon_int;
320 sdata->vif.bss_conf.basic_rates = basic_rates;
321 sdata->vif.cfg.ssid_len = ifibss->ssid_len;
322 memcpy(sdata->vif.cfg.ssid, ifibss->ssid, ifibss->ssid_len);
323 bss_change = BSS_CHANGED_BEACON_INT;
324 bss_change |= ieee80211_reset_erp_info(sdata);
325 bss_change |= BSS_CHANGED_BSSID;
326 bss_change |= BSS_CHANGED_BEACON;
327 bss_change |= BSS_CHANGED_BEACON_ENABLED;
328 bss_change |= BSS_CHANGED_BASIC_RATES;
329 bss_change |= BSS_CHANGED_HT;
330 bss_change |= BSS_CHANGED_IBSS;
331 bss_change |= BSS_CHANGED_SSID;
332
333 /*
334 * In 5 GHz/802.11a, we can always use short slot time.
335 * (IEEE 802.11-2012 18.3.8.7)
336 *
337 * In 2.4GHz, we must always use long slots in IBSS for compatibility
338 * reasons.
339 * (IEEE 802.11-2012 19.4.5)
340 *
341 * HT follows these specifications (IEEE 802.11-2012 20.3.18)
342 */
343 sdata->vif.bss_conf.use_short_slot = chan->band == NL80211_BAND_5GHZ;
344 bss_change |= BSS_CHANGED_ERP_SLOT;
345
346 /* cf. IEEE 802.11 9.2.12 */
347 sdata->deflink.operating_11g_mode =
348 chan->band == NL80211_BAND_2GHZ && have_higher_than_11mbit;
349
350 ieee80211_set_wmm_default(link: &sdata->deflink, bss_notify: true, enable_qos: false);
351
352 sdata->vif.cfg.ibss_joined = true;
353 sdata->vif.cfg.ibss_creator = creator;
354
355 err = drv_join_ibss(local, sdata);
356 if (err) {
357 sdata->vif.cfg.ibss_joined = false;
358 sdata->vif.cfg.ibss_creator = false;
359 sdata->vif.bss_conf.enable_beacon = false;
360 sdata->vif.cfg.ssid_len = 0;
361 RCU_INIT_POINTER(ifibss->presp, NULL);
362 kfree_rcu(presp, rcu_head);
363 ieee80211_link_release_channel(link: &sdata->deflink);
364 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
365 err);
366 return;
367 }
368
369 ieee80211_bss_info_change_notify(sdata, changed: bss_change);
370
371 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
372 mod_timer(timer: &ifibss->timer,
373 expires: round_jiffies(j: jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
374
375 bss_meta.chan = chan;
376 bss = cfg80211_inform_bss_frame_data(wiphy: local->hw.wiphy, data: &bss_meta, mgmt,
377 len: presp->head_len, GFP_KERNEL);
378
379 cfg80211_put_bss(wiphy: local->hw.wiphy, bss);
380 netif_carrier_on(dev: sdata->dev);
381 cfg80211_ibss_joined(dev: sdata->dev, bssid: ifibss->bssid, channel: chan, GFP_KERNEL);
382}
383
384static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
385 struct ieee80211_bss *bss)
386{
387 struct cfg80211_bss *cbss =
388 container_of((void *)bss, struct cfg80211_bss, priv);
389 struct ieee80211_supported_band *sband;
390 struct cfg80211_chan_def chandef;
391 u32 basic_rates;
392 int i, j;
393 u16 beacon_int = cbss->beacon_interval;
394 const struct cfg80211_bss_ies *ies;
395 enum nl80211_channel_type chan_type;
396 u64 tsf;
397 u32 rate_flags;
398
399 lockdep_assert_wiphy(sdata->local->hw.wiphy);
400
401 if (beacon_int < 10)
402 beacon_int = 10;
403
404 switch (sdata->u.ibss.chandef.width) {
405 case NL80211_CHAN_WIDTH_20_NOHT:
406 case NL80211_CHAN_WIDTH_20:
407 case NL80211_CHAN_WIDTH_40:
408 chan_type = cfg80211_get_chandef_type(chandef: &sdata->u.ibss.chandef);
409 cfg80211_chandef_create(chandef: &chandef, channel: cbss->channel, chantype: chan_type);
410 break;
411 case NL80211_CHAN_WIDTH_5:
412 case NL80211_CHAN_WIDTH_10:
413 cfg80211_chandef_create(chandef: &chandef, channel: cbss->channel,
414 chantype: NL80211_CHAN_NO_HT);
415 chandef.width = sdata->u.ibss.chandef.width;
416 break;
417 case NL80211_CHAN_WIDTH_80:
418 case NL80211_CHAN_WIDTH_80P80:
419 case NL80211_CHAN_WIDTH_160:
420 chandef = sdata->u.ibss.chandef;
421 chandef.chan = cbss->channel;
422 break;
423 default:
424 /* fall back to 20 MHz for unsupported modes */
425 cfg80211_chandef_create(chandef: &chandef, channel: cbss->channel,
426 chantype: NL80211_CHAN_NO_HT);
427 break;
428 }
429
430 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
431 rate_flags = ieee80211_chandef_rate_flags(chandef: &sdata->u.ibss.chandef);
432
433 basic_rates = 0;
434
435 for (i = 0; i < bss->supp_rates_len; i++) {
436 int rate = bss->supp_rates[i] & 0x7f;
437 bool is_basic = !!(bss->supp_rates[i] & 0x80);
438
439 for (j = 0; j < sband->n_bitrates; j++) {
440 int brate;
441 if ((rate_flags & sband->bitrates[j].flags)
442 != rate_flags)
443 continue;
444
445 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate, 5);
446 if (brate == rate) {
447 if (is_basic)
448 basic_rates |= BIT(j);
449 break;
450 }
451 }
452 }
453
454 rcu_read_lock();
455 ies = rcu_dereference(cbss->ies);
456 tsf = ies->tsf;
457 rcu_read_unlock();
458
459 __ieee80211_sta_join_ibss(sdata, bssid: cbss->bssid,
460 beacon_int,
461 req_chandef: &chandef,
462 basic_rates,
463 capability: cbss->capability,
464 tsf, creator: false);
465}
466
467int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
468 struct cfg80211_csa_settings *csa_settings,
469 u64 *changed)
470{
471 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
472 struct beacon_data *presp, *old_presp;
473 struct cfg80211_bss *cbss;
474 const struct cfg80211_bss_ies *ies;
475 u16 capability = WLAN_CAPABILITY_IBSS;
476 u64 tsf;
477
478 lockdep_assert_wiphy(sdata->local->hw.wiphy);
479
480 if (ifibss->privacy)
481 capability |= WLAN_CAPABILITY_PRIVACY;
482
483 cbss = cfg80211_get_bss(wiphy: sdata->local->hw.wiphy, channel: ifibss->chandef.chan,
484 bssid: ifibss->bssid, ssid: ifibss->ssid,
485 ssid_len: ifibss->ssid_len, bss_type: IEEE80211_BSS_TYPE_IBSS,
486 IEEE80211_PRIVACY(ifibss->privacy));
487
488 if (WARN_ON(!cbss))
489 return -EINVAL;
490
491 rcu_read_lock();
492 ies = rcu_dereference(cbss->ies);
493 tsf = ies->tsf;
494 rcu_read_unlock();
495 cfg80211_put_bss(wiphy: sdata->local->hw.wiphy, bss: cbss);
496
497 old_presp = sdata_dereference(ifibss->presp, sdata);
498
499 presp = ieee80211_ibss_build_presp(sdata,
500 beacon_int: sdata->vif.bss_conf.beacon_int,
501 basic_rates: sdata->vif.bss_conf.basic_rates,
502 capability, tsf, chandef: &ifibss->chandef,
503 NULL, csa_settings);
504 if (!presp)
505 return -ENOMEM;
506
507 rcu_assign_pointer(ifibss->presp, presp);
508 if (old_presp)
509 kfree_rcu(old_presp, rcu_head);
510
511 *changed |= BSS_CHANGED_BEACON;
512 return 0;
513}
514
515int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata, u64 *changed)
516{
517 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
518 struct cfg80211_bss *cbss;
519
520 lockdep_assert_wiphy(sdata->local->hw.wiphy);
521
522 /* When not connected/joined, sending CSA doesn't make sense. */
523 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED)
524 return -ENOLINK;
525
526 /* update cfg80211 bss information with the new channel */
527 if (!is_zero_ether_addr(addr: ifibss->bssid)) {
528 cbss = cfg80211_get_bss(wiphy: sdata->local->hw.wiphy,
529 channel: ifibss->chandef.chan,
530 bssid: ifibss->bssid, ssid: ifibss->ssid,
531 ssid_len: ifibss->ssid_len,
532 bss_type: IEEE80211_BSS_TYPE_IBSS,
533 IEEE80211_PRIVACY(ifibss->privacy));
534 /* XXX: should not really modify cfg80211 data */
535 if (cbss) {
536 cbss->channel = sdata->deflink.csa_chandef.chan;
537 cfg80211_put_bss(wiphy: sdata->local->hw.wiphy, bss: cbss);
538 }
539 }
540
541 ifibss->chandef = sdata->deflink.csa_chandef;
542
543 /* generate the beacon */
544 return ieee80211_ibss_csa_beacon(sdata, NULL, changed);
545}
546
547void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
548{
549 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
550
551 wiphy_work_cancel(wiphy: sdata->local->hw.wiphy,
552 work: &ifibss->csa_connection_drop_work);
553}
554
555static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
556 __acquires(RCU)
557{
558 struct ieee80211_sub_if_data *sdata = sta->sdata;
559 u8 addr[ETH_ALEN];
560
561 memcpy(addr, sta->sta.addr, ETH_ALEN);
562
563 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
564
565 sta_info_pre_move_state(sta, new_state: IEEE80211_STA_AUTH);
566 sta_info_pre_move_state(sta, new_state: IEEE80211_STA_ASSOC);
567 /* authorize the station only if the network is not RSN protected. If
568 * not wait for the userspace to authorize it */
569 if (!sta->sdata->u.ibss.control_port)
570 sta_info_pre_move_state(sta, new_state: IEEE80211_STA_AUTHORIZED);
571
572 rate_control_rate_init(sta);
573
574 /* If it fails, maybe we raced another insertion? */
575 if (sta_info_insert_rcu(sta))
576 return sta_info_get(sdata, addr);
577 return sta;
578}
579
580static struct sta_info *
581ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
582 const u8 *addr, u32 supp_rates)
583 __acquires(RCU)
584{
585 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
586 struct ieee80211_local *local = sdata->local;
587 struct sta_info *sta;
588 struct ieee80211_chanctx_conf *chanctx_conf;
589 struct ieee80211_supported_band *sband;
590 int band;
591
592 /*
593 * XXX: Consider removing the least recently used entry and
594 * allow new one to be added.
595 */
596 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
597 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
598 sdata->name, addr);
599 rcu_read_lock();
600 return NULL;
601 }
602
603 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
604 rcu_read_lock();
605 return NULL;
606 }
607
608 if (!ether_addr_equal(addr1: bssid, addr2: sdata->u.ibss.bssid)) {
609 rcu_read_lock();
610 return NULL;
611 }
612
613 rcu_read_lock();
614 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
615 if (WARN_ON_ONCE(!chanctx_conf))
616 return NULL;
617 band = chanctx_conf->def.chan->band;
618 rcu_read_unlock();
619
620 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
621 if (!sta) {
622 rcu_read_lock();
623 return NULL;
624 }
625
626 /* make sure mandatory rates are always added */
627 sband = local->hw.wiphy->bands[band];
628 sta->sta.deflink.supp_rates[band] = supp_rates |
629 ieee80211_mandatory_rates(sband);
630
631 return ieee80211_ibss_finish_sta(sta);
632}
633
634static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
635{
636 struct ieee80211_local *local = sdata->local;
637 int active = 0;
638 struct sta_info *sta;
639
640 lockdep_assert_wiphy(sdata->local->hw.wiphy);
641
642 rcu_read_lock();
643
644 list_for_each_entry_rcu(sta, &local->sta_list, list) {
645 unsigned long last_active = ieee80211_sta_last_active(sta);
646
647 if (sta->sdata == sdata &&
648 time_is_after_jiffies(last_active +
649 IEEE80211_IBSS_MERGE_INTERVAL)) {
650 active++;
651 break;
652 }
653 }
654
655 rcu_read_unlock();
656
657 return active;
658}
659
660static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
661{
662 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
663 struct ieee80211_local *local = sdata->local;
664 struct cfg80211_bss *cbss;
665 struct beacon_data *presp;
666 struct sta_info *sta;
667
668 lockdep_assert_wiphy(local->hw.wiphy);
669
670 if (!is_zero_ether_addr(addr: ifibss->bssid)) {
671 cbss = cfg80211_get_bss(wiphy: local->hw.wiphy, channel: ifibss->chandef.chan,
672 bssid: ifibss->bssid, ssid: ifibss->ssid,
673 ssid_len: ifibss->ssid_len,
674 bss_type: IEEE80211_BSS_TYPE_IBSS,
675 IEEE80211_PRIVACY(ifibss->privacy));
676
677 if (cbss) {
678 cfg80211_unlink_bss(wiphy: local->hw.wiphy, bss: cbss);
679 cfg80211_put_bss(wiphy: sdata->local->hw.wiphy, bss: cbss);
680 }
681 }
682
683 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
684
685 sta_info_flush(sdata);
686
687 spin_lock_bh(lock: &ifibss->incomplete_lock);
688 while (!list_empty(head: &ifibss->incomplete_stations)) {
689 sta = list_first_entry(&ifibss->incomplete_stations,
690 struct sta_info, list);
691 list_del(entry: &sta->list);
692 spin_unlock_bh(lock: &ifibss->incomplete_lock);
693
694 sta_info_free(local, sta);
695 spin_lock_bh(lock: &ifibss->incomplete_lock);
696 }
697 spin_unlock_bh(lock: &ifibss->incomplete_lock);
698
699 netif_carrier_off(dev: sdata->dev);
700
701 sdata->vif.cfg.ibss_joined = false;
702 sdata->vif.cfg.ibss_creator = false;
703 sdata->vif.bss_conf.enable_beacon = false;
704 sdata->vif.cfg.ssid_len = 0;
705
706 /* remove beacon */
707 presp = sdata_dereference(ifibss->presp, sdata);
708 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
709 if (presp)
710 kfree_rcu(presp, rcu_head);
711
712 clear_bit(nr: SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, addr: &sdata->state);
713 ieee80211_bss_info_change_notify(sdata, changed: BSS_CHANGED_BEACON_ENABLED |
714 BSS_CHANGED_IBSS);
715 drv_leave_ibss(local, sdata);
716 ieee80211_link_release_channel(link: &sdata->deflink);
717}
718
719static void ieee80211_csa_connection_drop_work(struct wiphy *wiphy,
720 struct wiphy_work *work)
721{
722 struct ieee80211_sub_if_data *sdata =
723 container_of(work, struct ieee80211_sub_if_data,
724 u.ibss.csa_connection_drop_work);
725
726 ieee80211_ibss_disconnect(sdata);
727 synchronize_rcu();
728 skb_queue_purge(list: &sdata->skb_queue);
729
730 /* trigger a scan to find another IBSS network to join */
731 wiphy_work_queue(wiphy: sdata->local->hw.wiphy, work: &sdata->work);
732}
733
734static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
735{
736 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
737 int err;
738
739 /* if the current channel is a DFS channel, mark the channel as
740 * unavailable.
741 */
742 err = cfg80211_chandef_dfs_required(wiphy: sdata->local->hw.wiphy,
743 chandef: &ifibss->chandef,
744 iftype: NL80211_IFTYPE_ADHOC);
745 if (err > 0)
746 cfg80211_radar_event(wiphy: sdata->local->hw.wiphy, chandef: &ifibss->chandef,
747 GFP_ATOMIC);
748}
749
750static bool
751ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
752 struct ieee802_11_elems *elems,
753 bool beacon)
754{
755 struct cfg80211_csa_settings params;
756 struct ieee80211_csa_ie csa_ie;
757 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
758 enum nl80211_channel_type ch_type;
759 int err;
760 ieee80211_conn_flags_t conn_flags;
761 u32 vht_cap_info = 0;
762
763 lockdep_assert_wiphy(sdata->local->hw.wiphy);
764
765 conn_flags = IEEE80211_CONN_DISABLE_VHT;
766
767 switch (ifibss->chandef.width) {
768 case NL80211_CHAN_WIDTH_5:
769 case NL80211_CHAN_WIDTH_10:
770 case NL80211_CHAN_WIDTH_20_NOHT:
771 conn_flags |= IEEE80211_CONN_DISABLE_HT;
772 fallthrough;
773 case NL80211_CHAN_WIDTH_20:
774 conn_flags |= IEEE80211_CONN_DISABLE_40MHZ;
775 break;
776 default:
777 break;
778 }
779
780 if (elems->vht_cap_elem)
781 vht_cap_info = le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
782
783 memset(&params, 0, sizeof(params));
784 err = ieee80211_parse_ch_switch_ie(sdata, elems,
785 current_band: ifibss->chandef.chan->band,
786 vht_cap_info,
787 conn_flags, bssid: ifibss->bssid, csa_ie: &csa_ie);
788 /* can't switch to destination channel, fail */
789 if (err < 0)
790 goto disconnect;
791
792 /* did not contain a CSA */
793 if (err)
794 return false;
795
796 /* channel switch is not supported, disconnect */
797 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
798 goto disconnect;
799
800 params.count = csa_ie.count;
801 params.chandef = csa_ie.chandef;
802
803 switch (ifibss->chandef.width) {
804 case NL80211_CHAN_WIDTH_20_NOHT:
805 case NL80211_CHAN_WIDTH_20:
806 case NL80211_CHAN_WIDTH_40:
807 /* keep our current HT mode (HT20/HT40+/HT40-), even if
808 * another mode has been announced. The mode is not adopted
809 * within the beacon while doing CSA and we should therefore
810 * keep the mode which we announce.
811 */
812 ch_type = cfg80211_get_chandef_type(chandef: &ifibss->chandef);
813 cfg80211_chandef_create(chandef: &params.chandef, channel: params.chandef.chan,
814 chantype: ch_type);
815 break;
816 case NL80211_CHAN_WIDTH_5:
817 case NL80211_CHAN_WIDTH_10:
818 if (params.chandef.width != ifibss->chandef.width) {
819 sdata_info(sdata,
820 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
821 ifibss->bssid,
822 params.chandef.chan->center_freq,
823 params.chandef.width,
824 params.chandef.center_freq1,
825 params.chandef.center_freq2);
826 goto disconnect;
827 }
828 break;
829 default:
830 /* should not happen, conn_flags should prevent VHT modes. */
831 WARN_ON(1);
832 goto disconnect;
833 }
834
835 if (!cfg80211_reg_can_beacon(wiphy: sdata->local->hw.wiphy, chandef: &params.chandef,
836 iftype: NL80211_IFTYPE_ADHOC)) {
837 sdata_info(sdata,
838 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
839 ifibss->bssid,
840 params.chandef.chan->center_freq,
841 params.chandef.width,
842 params.chandef.center_freq1,
843 params.chandef.center_freq2);
844 goto disconnect;
845 }
846
847 err = cfg80211_chandef_dfs_required(wiphy: sdata->local->hw.wiphy,
848 chandef: &params.chandef,
849 iftype: NL80211_IFTYPE_ADHOC);
850 if (err < 0)
851 goto disconnect;
852 if (err > 0 && !ifibss->userspace_handles_dfs) {
853 /* IBSS-DFS only allowed with a control program */
854 goto disconnect;
855 }
856
857 params.radar_required = err;
858
859 if (cfg80211_chandef_identical(chandef1: &params.chandef,
860 chandef2: &sdata->vif.bss_conf.chandef)) {
861 ibss_dbg(sdata,
862 "received csa with an identical chandef, ignoring\n");
863 return true;
864 }
865
866 /* all checks done, now perform the channel switch. */
867 ibss_dbg(sdata,
868 "received channel switch announcement to go to channel %d MHz\n",
869 params.chandef.chan->center_freq);
870
871 params.block_tx = !!csa_ie.mode;
872
873 if (ieee80211_channel_switch(wiphy: sdata->local->hw.wiphy, dev: sdata->dev,
874 params: &params))
875 goto disconnect;
876
877 ieee80211_ibss_csa_mark_radar(sdata);
878
879 return true;
880disconnect:
881 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
882 wiphy_work_queue(wiphy: sdata->local->hw.wiphy,
883 work: &ifibss->csa_connection_drop_work);
884
885 ieee80211_ibss_csa_mark_radar(sdata);
886
887 return true;
888}
889
890static void
891ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
892 struct ieee80211_mgmt *mgmt, size_t len,
893 struct ieee80211_rx_status *rx_status,
894 struct ieee802_11_elems *elems)
895{
896 int required_len;
897
898 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
899 return;
900
901 /* CSA is the only action we handle for now */
902 if (mgmt->u.action.u.measurement.action_code !=
903 WLAN_ACTION_SPCT_CHL_SWITCH)
904 return;
905
906 required_len = IEEE80211_MIN_ACTION_SIZE +
907 sizeof(mgmt->u.action.u.chan_switch);
908 if (len < required_len)
909 return;
910
911 if (!sdata->vif.bss_conf.csa_active)
912 ieee80211_ibss_process_chanswitch(sdata, elems, beacon: false);
913}
914
915static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
916 struct ieee80211_mgmt *mgmt,
917 size_t len)
918{
919 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
920
921 if (len < IEEE80211_DEAUTH_FRAME_LEN)
922 return;
923
924 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
925 ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason);
926 sta_info_destroy_addr(sdata, addr: mgmt->sa);
927}
928
929static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
930 struct ieee80211_mgmt *mgmt,
931 size_t len)
932{
933 u16 auth_alg, auth_transaction;
934
935 lockdep_assert_wiphy(sdata->local->hw.wiphy);
936
937 if (len < 24 + 6)
938 return;
939
940 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
941 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
942
943 ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
944 ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n",
945 mgmt->bssid, auth_transaction);
946
947 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
948 return;
949
950 /*
951 * IEEE 802.11 standard does not require authentication in IBSS
952 * networks and most implementations do not seem to use it.
953 * However, try to reply to authentication attempts if someone
954 * has actually implemented this.
955 */
956 ieee80211_send_auth(sdata, transaction: 2, WLAN_AUTH_OPEN, status: 0, NULL, extra_len: 0,
957 bssid: mgmt->sa, da: sdata->u.ibss.bssid, NULL, key_len: 0, key_idx: 0, tx_flags: 0);
958}
959
960static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
961 struct ieee80211_mgmt *mgmt, size_t len,
962 struct ieee80211_rx_status *rx_status,
963 struct ieee802_11_elems *elems,
964 struct ieee80211_channel *channel)
965{
966 struct sta_info *sta;
967 enum nl80211_band band = rx_status->band;
968 struct ieee80211_local *local = sdata->local;
969 struct ieee80211_supported_band *sband;
970 bool rates_updated = false;
971 u32 supp_rates = 0;
972
973 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
974 return;
975
976 if (!ether_addr_equal(addr1: mgmt->bssid, addr2: sdata->u.ibss.bssid))
977 return;
978
979 sband = local->hw.wiphy->bands[band];
980 if (WARN_ON(!sband))
981 return;
982
983 rcu_read_lock();
984 sta = sta_info_get(sdata, addr: mgmt->sa);
985
986 if (elems->supp_rates) {
987 supp_rates = ieee80211_sta_get_rates(sdata, elems,
988 band, NULL);
989 if (sta) {
990 u32 prev_rates;
991
992 prev_rates = sta->sta.deflink.supp_rates[band];
993
994 sta->sta.deflink.supp_rates[band] = supp_rates |
995 ieee80211_mandatory_rates(sband);
996 if (sta->sta.deflink.supp_rates[band] != prev_rates) {
997 ibss_dbg(sdata,
998 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
999 sta->sta.addr, prev_rates,
1000 sta->sta.deflink.supp_rates[band]);
1001 rates_updated = true;
1002 }
1003 } else {
1004 rcu_read_unlock();
1005 sta = ieee80211_ibss_add_sta(sdata, bssid: mgmt->bssid,
1006 addr: mgmt->sa, supp_rates);
1007 }
1008 }
1009
1010 if (sta && !sta->sta.wme &&
1011 (elems->wmm_info || elems->s1g_capab) &&
1012 local->hw.queues >= IEEE80211_NUM_ACS) {
1013 sta->sta.wme = true;
1014 ieee80211_check_fast_xmit(sta);
1015 }
1016
1017 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1018 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1019 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1020 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1021 /* we both use HT */
1022 struct ieee80211_ht_cap htcap_ie;
1023 struct cfg80211_chan_def chandef;
1024 enum ieee80211_sta_rx_bandwidth bw = sta->sta.deflink.bandwidth;
1025
1026 cfg80211_chandef_create(chandef: &chandef, channel, chantype: NL80211_CHAN_NO_HT);
1027 ieee80211_chandef_ht_oper(ht_oper: elems->ht_operation, chandef: &chandef);
1028
1029 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1030 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1031 ht_cap_ie: &htcap_ie,
1032 link_sta: &sta->deflink);
1033
1034 if (elems->vht_operation && elems->vht_cap_elem &&
1035 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1036 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1037 /* we both use VHT */
1038 struct ieee80211_vht_cap cap_ie;
1039 struct ieee80211_sta_vht_cap cap = sta->sta.deflink.vht_cap;
1040 u32 vht_cap_info =
1041 le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
1042
1043 ieee80211_chandef_vht_oper(hw: &local->hw, vht_cap_info,
1044 oper: elems->vht_operation,
1045 htop: elems->ht_operation,
1046 chandef: &chandef);
1047 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1048 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1049 vht_cap_ie: &cap_ie, NULL,
1050 link_sta: &sta->deflink);
1051 if (memcmp(p: &cap, q: &sta->sta.deflink.vht_cap, size: sizeof(cap)))
1052 rates_updated |= true;
1053 }
1054
1055 if (bw != sta->sta.deflink.bandwidth)
1056 rates_updated |= true;
1057
1058 if (!cfg80211_chandef_compatible(chandef1: &sdata->u.ibss.chandef,
1059 chandef2: &chandef))
1060 WARN_ON_ONCE(1);
1061 }
1062
1063 if (sta && rates_updated) {
1064 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1065 u8 rx_nss = sta->sta.deflink.rx_nss;
1066
1067 /* Force rx_nss recalculation */
1068 sta->sta.deflink.rx_nss = 0;
1069 rate_control_rate_init(sta);
1070 if (sta->sta.deflink.rx_nss != rx_nss)
1071 changed |= IEEE80211_RC_NSS_CHANGED;
1072
1073 drv_sta_rc_update(local, sdata, sta: &sta->sta, changed);
1074 }
1075
1076 rcu_read_unlock();
1077}
1078
1079static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1080 struct ieee80211_mgmt *mgmt, size_t len,
1081 struct ieee80211_rx_status *rx_status,
1082 struct ieee802_11_elems *elems)
1083{
1084 struct ieee80211_local *local = sdata->local;
1085 struct cfg80211_bss *cbss;
1086 struct ieee80211_bss *bss;
1087 struct ieee80211_channel *channel;
1088 u64 beacon_timestamp, rx_timestamp;
1089 u32 supp_rates = 0;
1090 enum nl80211_band band = rx_status->band;
1091
1092 channel = ieee80211_get_channel(wiphy: local->hw.wiphy, freq: rx_status->freq);
1093 if (!channel)
1094 return;
1095
1096 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1097
1098 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel);
1099 if (!bss)
1100 return;
1101
1102 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1103
1104 /* same for beacon and probe response */
1105 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1106
1107 /* check if we need to merge IBSS */
1108
1109 /* not an IBSS */
1110 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1111 goto put_bss;
1112
1113 /* different channel */
1114 if (sdata->u.ibss.fixed_channel &&
1115 sdata->u.ibss.chandef.chan != cbss->channel)
1116 goto put_bss;
1117
1118 /* different SSID */
1119 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1120 memcmp(p: elems->ssid, q: sdata->u.ibss.ssid,
1121 size: sdata->u.ibss.ssid_len))
1122 goto put_bss;
1123
1124 /* process channel switch */
1125 if (sdata->vif.bss_conf.csa_active ||
1126 ieee80211_ibss_process_chanswitch(sdata, elems, beacon: true))
1127 goto put_bss;
1128
1129 /* same BSSID */
1130 if (ether_addr_equal(addr1: cbss->bssid, addr2: sdata->u.ibss.bssid))
1131 goto put_bss;
1132
1133 /* we use a fixed BSSID */
1134 if (sdata->u.ibss.fixed_bssid)
1135 goto put_bss;
1136
1137 if (ieee80211_have_rx_timestamp(status: rx_status)) {
1138 /* time when timestamp field was received */
1139 rx_timestamp =
1140 ieee80211_calculate_rx_timestamp(local, status: rx_status,
1141 mpdu_len: len + FCS_LEN, mpdu_offset: 24);
1142 } else {
1143 /*
1144 * second best option: get current TSF
1145 * (will return -1 if not supported)
1146 */
1147 rx_timestamp = drv_get_tsf(local, sdata);
1148 }
1149
1150 ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n",
1151 mgmt->sa, mgmt->bssid,
1152 (unsigned long long)rx_timestamp);
1153 ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n",
1154 (unsigned long long)beacon_timestamp,
1155 (unsigned long long)(rx_timestamp - beacon_timestamp),
1156 jiffies);
1157
1158 if (beacon_timestamp > rx_timestamp) {
1159 ibss_dbg(sdata,
1160 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1161 mgmt->bssid);
1162 ieee80211_sta_join_ibss(sdata, bss);
1163 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1164 ieee80211_ibss_add_sta(sdata, bssid: mgmt->bssid, addr: mgmt->sa,
1165 supp_rates);
1166 rcu_read_unlock();
1167 }
1168
1169 put_bss:
1170 ieee80211_rx_bss_put(local, bss);
1171}
1172
1173void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1174 const u8 *bssid, const u8 *addr,
1175 u32 supp_rates)
1176{
1177 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1178 struct ieee80211_local *local = sdata->local;
1179 struct sta_info *sta;
1180 struct ieee80211_chanctx_conf *chanctx_conf;
1181 struct ieee80211_supported_band *sband;
1182 int band;
1183
1184 /*
1185 * XXX: Consider removing the least recently used entry and
1186 * allow new one to be added.
1187 */
1188 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1189 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1190 sdata->name, addr);
1191 return;
1192 }
1193
1194 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1195 return;
1196
1197 if (!ether_addr_equal(addr1: bssid, addr2: sdata->u.ibss.bssid))
1198 return;
1199
1200 rcu_read_lock();
1201 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
1202 if (WARN_ON_ONCE(!chanctx_conf)) {
1203 rcu_read_unlock();
1204 return;
1205 }
1206 band = chanctx_conf->def.chan->band;
1207 rcu_read_unlock();
1208
1209 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1210 if (!sta)
1211 return;
1212
1213 /* make sure mandatory rates are always added */
1214 sband = local->hw.wiphy->bands[band];
1215 sta->sta.deflink.supp_rates[band] = supp_rates |
1216 ieee80211_mandatory_rates(sband);
1217
1218 spin_lock(lock: &ifibss->incomplete_lock);
1219 list_add(new: &sta->list, head: &ifibss->incomplete_stations);
1220 spin_unlock(lock: &ifibss->incomplete_lock);
1221 wiphy_work_queue(wiphy: local->hw.wiphy, work: &sdata->work);
1222}
1223
1224static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1225{
1226 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1227 struct ieee80211_local *local = sdata->local;
1228 struct sta_info *sta, *tmp;
1229 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1230 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1231
1232 lockdep_assert_wiphy(local->hw.wiphy);
1233
1234 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1235 unsigned long last_active = ieee80211_sta_last_active(sta);
1236
1237 if (sdata != sta->sdata)
1238 continue;
1239
1240 if (time_is_before_jiffies(last_active + exp_time) ||
1241 (time_is_before_jiffies(last_active + exp_rsn) &&
1242 sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1243 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
1244
1245 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1246 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1247 "not authorized " : "", sta->sta.addr);
1248
1249 ieee80211_send_deauth_disassoc(sdata, da: sta->sta.addr,
1250 bssid: ifibss->bssid,
1251 IEEE80211_STYPE_DEAUTH,
1252 reason: WLAN_REASON_DEAUTH_LEAVING,
1253 send_frame: true, frame_buf);
1254 WARN_ON(__sta_info_destroy(sta));
1255 }
1256 }
1257}
1258
1259/*
1260 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1261 */
1262
1263static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1264{
1265 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1266
1267 lockdep_assert_wiphy(sdata->local->hw.wiphy);
1268
1269 mod_timer(timer: &ifibss->timer,
1270 expires: round_jiffies(j: jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1271
1272 ieee80211_ibss_sta_expire(sdata);
1273
1274 if (time_before(jiffies, ifibss->last_scan_completed +
1275 IEEE80211_IBSS_MERGE_INTERVAL))
1276 return;
1277
1278 if (ieee80211_sta_active_ibss(sdata))
1279 return;
1280
1281 if (ifibss->fixed_channel)
1282 return;
1283
1284 sdata_info(sdata,
1285 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1286
1287 ieee80211_request_ibss_scan(sdata, ssid: ifibss->ssid, ssid_len: ifibss->ssid_len,
1288 NULL, n_channels: 0);
1289}
1290
1291static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1292{
1293 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1294 u8 bssid[ETH_ALEN];
1295 u16 capability;
1296 int i;
1297
1298 lockdep_assert_wiphy(sdata->local->hw.wiphy);
1299
1300 if (ifibss->fixed_bssid) {
1301 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1302 } else {
1303 /* Generate random, not broadcast, locally administered BSSID. Mix in
1304 * own MAC address to make sure that devices that do not have proper
1305 * random number generator get different BSSID. */
1306 get_random_bytes(buf: bssid, ETH_ALEN);
1307 for (i = 0; i < ETH_ALEN; i++)
1308 bssid[i] ^= sdata->vif.addr[i];
1309 bssid[0] &= ~0x01;
1310 bssid[0] |= 0x02;
1311 }
1312
1313 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1314
1315 capability = WLAN_CAPABILITY_IBSS;
1316
1317 if (ifibss->privacy)
1318 capability |= WLAN_CAPABILITY_PRIVACY;
1319
1320 __ieee80211_sta_join_ibss(sdata, bssid, beacon_int: sdata->vif.bss_conf.beacon_int,
1321 req_chandef: &ifibss->chandef, basic_rates: ifibss->basic_rates,
1322 capability, tsf: 0, creator: true);
1323}
1324
1325static unsigned int ibss_setup_channels(struct wiphy *wiphy,
1326 struct ieee80211_channel **channels,
1327 unsigned int channels_max,
1328 u32 center_freq, u32 width)
1329{
1330 struct ieee80211_channel *chan = NULL;
1331 unsigned int n_chan = 0;
1332 u32 start_freq, end_freq, freq;
1333
1334 if (width <= 20) {
1335 start_freq = center_freq;
1336 end_freq = center_freq;
1337 } else {
1338 start_freq = center_freq - width / 2 + 10;
1339 end_freq = center_freq + width / 2 - 10;
1340 }
1341
1342 for (freq = start_freq; freq <= end_freq; freq += 20) {
1343 chan = ieee80211_get_channel(wiphy, freq);
1344 if (!chan)
1345 continue;
1346 if (n_chan >= channels_max)
1347 return n_chan;
1348
1349 channels[n_chan] = chan;
1350 n_chan++;
1351 }
1352
1353 return n_chan;
1354}
1355
1356static unsigned int
1357ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1358 const struct cfg80211_chan_def *chandef,
1359 struct ieee80211_channel **channels,
1360 unsigned int channels_max)
1361{
1362 unsigned int n_chan = 0;
1363 u32 width, cf1, cf2 = 0;
1364
1365 switch (chandef->width) {
1366 case NL80211_CHAN_WIDTH_40:
1367 width = 40;
1368 break;
1369 case NL80211_CHAN_WIDTH_80P80:
1370 cf2 = chandef->center_freq2;
1371 fallthrough;
1372 case NL80211_CHAN_WIDTH_80:
1373 width = 80;
1374 break;
1375 case NL80211_CHAN_WIDTH_160:
1376 width = 160;
1377 break;
1378 default:
1379 width = 20;
1380 break;
1381 }
1382
1383 cf1 = chandef->center_freq1;
1384
1385 n_chan = ibss_setup_channels(wiphy, channels, channels_max, center_freq: cf1, width);
1386
1387 if (cf2)
1388 n_chan += ibss_setup_channels(wiphy, channels: &channels[n_chan],
1389 channels_max: channels_max - n_chan, center_freq: cf2,
1390 width);
1391
1392 return n_chan;
1393}
1394
1395/*
1396 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1397 */
1398
1399static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1400{
1401 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1402 struct ieee80211_local *local = sdata->local;
1403 struct cfg80211_bss *cbss;
1404 struct ieee80211_channel *chan = NULL;
1405 const u8 *bssid = NULL;
1406 int active_ibss;
1407
1408 lockdep_assert_wiphy(sdata->local->hw.wiphy);
1409
1410 active_ibss = ieee80211_sta_active_ibss(sdata);
1411 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1412
1413 if (active_ibss)
1414 return;
1415
1416 if (ifibss->fixed_bssid)
1417 bssid = ifibss->bssid;
1418 if (ifibss->fixed_channel)
1419 chan = ifibss->chandef.chan;
1420 if (!is_zero_ether_addr(addr: ifibss->bssid))
1421 bssid = ifibss->bssid;
1422 cbss = cfg80211_get_bss(wiphy: local->hw.wiphy, channel: chan, bssid,
1423 ssid: ifibss->ssid, ssid_len: ifibss->ssid_len,
1424 bss_type: IEEE80211_BSS_TYPE_IBSS,
1425 IEEE80211_PRIVACY(ifibss->privacy));
1426
1427 if (cbss) {
1428 struct ieee80211_bss *bss;
1429
1430 bss = (void *)cbss->priv;
1431 ibss_dbg(sdata,
1432 "sta_find_ibss: selected %pM current %pM\n",
1433 cbss->bssid, ifibss->bssid);
1434 sdata_info(sdata,
1435 "Selected IBSS BSSID %pM based on configured SSID\n",
1436 cbss->bssid);
1437
1438 ieee80211_sta_join_ibss(sdata, bss);
1439 ieee80211_rx_bss_put(local, bss);
1440 return;
1441 }
1442
1443 /* if a fixed bssid and a fixed freq have been provided create the IBSS
1444 * directly and do not waste time scanning
1445 */
1446 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1447 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1448 bssid);
1449 ieee80211_sta_create_ibss(sdata);
1450 return;
1451 }
1452
1453
1454 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1455
1456 /* Selected IBSS not found in current scan results - try to scan */
1457 if (time_after(jiffies, ifibss->last_scan_completed +
1458 IEEE80211_SCAN_INTERVAL)) {
1459 struct ieee80211_channel *channels[8];
1460 unsigned int num;
1461
1462 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1463
1464 if (ifibss->fixed_channel) {
1465 num = ieee80211_ibss_setup_scan_channels(wiphy: local->hw.wiphy,
1466 chandef: &ifibss->chandef,
1467 channels,
1468 ARRAY_SIZE(channels));
1469 ieee80211_request_ibss_scan(sdata, ssid: ifibss->ssid,
1470 ssid_len: ifibss->ssid_len, channels,
1471 n_channels: num);
1472 } else {
1473 ieee80211_request_ibss_scan(sdata, ssid: ifibss->ssid,
1474 ssid_len: ifibss->ssid_len, NULL, n_channels: 0);
1475 }
1476 } else {
1477 int interval = IEEE80211_SCAN_INTERVAL;
1478
1479 if (time_after(jiffies, ifibss->ibss_join_req +
1480 IEEE80211_IBSS_JOIN_TIMEOUT))
1481 ieee80211_sta_create_ibss(sdata);
1482
1483 mod_timer(timer: &ifibss->timer,
1484 expires: round_jiffies(j: jiffies + interval));
1485 }
1486}
1487
1488static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1489 struct sk_buff *req)
1490{
1491 struct ieee80211_mgmt *mgmt = (void *)req->data;
1492 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1493 struct ieee80211_local *local = sdata->local;
1494 int tx_last_beacon, len = req->len;
1495 struct sk_buff *skb;
1496 struct beacon_data *presp;
1497 u8 *pos, *end;
1498
1499 lockdep_assert_wiphy(sdata->local->hw.wiphy);
1500
1501 presp = sdata_dereference(ifibss->presp, sdata);
1502
1503 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1504 len < 24 + 2 || !presp)
1505 return;
1506
1507 tx_last_beacon = drv_tx_last_beacon(local);
1508
1509 ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
1510 ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n",
1511 mgmt->bssid, tx_last_beacon);
1512
1513 if (!tx_last_beacon && is_multicast_ether_addr(addr: mgmt->da))
1514 return;
1515
1516 if (!ether_addr_equal(addr1: mgmt->bssid, addr2: ifibss->bssid) &&
1517 !is_broadcast_ether_addr(addr: mgmt->bssid))
1518 return;
1519
1520 end = ((u8 *) mgmt) + len;
1521 pos = mgmt->u.probe_req.variable;
1522 if (pos[0] != WLAN_EID_SSID ||
1523 pos + 2 + pos[1] > end) {
1524 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1525 mgmt->sa);
1526 return;
1527 }
1528 if (pos[1] != 0 &&
1529 (pos[1] != ifibss->ssid_len ||
1530 memcmp(p: pos + 2, q: ifibss->ssid, size: ifibss->ssid_len))) {
1531 /* Ignore ProbeReq for foreign SSID */
1532 return;
1533 }
1534
1535 /* Reply with ProbeResp */
1536 skb = dev_alloc_skb(length: local->tx_headroom + presp->head_len);
1537 if (!skb)
1538 return;
1539
1540 skb_reserve(skb, len: local->tx_headroom);
1541 skb_put_data(skb, data: presp->head, len: presp->head_len);
1542
1543 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1544 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1545 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1546
1547 /* avoid excessive retries for probe request to wildcard SSIDs */
1548 if (pos[1] == 0)
1549 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1550
1551 ieee80211_tx_skb(sdata, skb);
1552}
1553
1554static
1555void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1556 struct ieee80211_mgmt *mgmt, size_t len,
1557 struct ieee80211_rx_status *rx_status)
1558{
1559 size_t baselen;
1560 struct ieee802_11_elems *elems;
1561
1562 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1563 offsetof(typeof(mgmt->u.beacon), variable));
1564
1565 /*
1566 * either beacon or probe_resp but the variable field is at the
1567 * same offset
1568 */
1569 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1570 if (baselen > len)
1571 return;
1572
1573 elems = ieee802_11_parse_elems(start: mgmt->u.probe_resp.variable,
1574 len: len - baselen, action: false, NULL);
1575
1576 if (elems) {
1577 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, elems);
1578 kfree(objp: elems);
1579 }
1580}
1581
1582void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1583 struct sk_buff *skb)
1584{
1585 struct ieee80211_rx_status *rx_status;
1586 struct ieee80211_mgmt *mgmt;
1587 u16 fc;
1588 struct ieee802_11_elems *elems;
1589 int ies_len;
1590
1591 rx_status = IEEE80211_SKB_RXCB(skb);
1592 mgmt = (struct ieee80211_mgmt *) skb->data;
1593 fc = le16_to_cpu(mgmt->frame_control);
1594
1595 if (!sdata->u.ibss.ssid_len)
1596 return; /* not ready to merge yet */
1597
1598 switch (fc & IEEE80211_FCTL_STYPE) {
1599 case IEEE80211_STYPE_PROBE_REQ:
1600 ieee80211_rx_mgmt_probe_req(sdata, req: skb);
1601 break;
1602 case IEEE80211_STYPE_PROBE_RESP:
1603 case IEEE80211_STYPE_BEACON:
1604 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, len: skb->len,
1605 rx_status);
1606 break;
1607 case IEEE80211_STYPE_AUTH:
1608 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, len: skb->len);
1609 break;
1610 case IEEE80211_STYPE_DEAUTH:
1611 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, len: skb->len);
1612 break;
1613 case IEEE80211_STYPE_ACTION:
1614 switch (mgmt->u.action.category) {
1615 case WLAN_CATEGORY_SPECTRUM_MGMT:
1616 ies_len = skb->len -
1617 offsetof(struct ieee80211_mgmt,
1618 u.action.u.chan_switch.variable);
1619
1620 if (ies_len < 0)
1621 break;
1622
1623 elems = ieee802_11_parse_elems(
1624 start: mgmt->u.action.u.chan_switch.variable,
1625 len: ies_len, action: true, NULL);
1626
1627 if (elems && !elems->parse_error)
1628 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt,
1629 len: skb->len,
1630 rx_status,
1631 elems);
1632 kfree(objp: elems);
1633 break;
1634 }
1635 }
1636}
1637
1638void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1639{
1640 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1641 struct sta_info *sta;
1642
1643 /*
1644 * Work could be scheduled after scan or similar
1645 * when we aren't even joined (or trying) with a
1646 * network.
1647 */
1648 if (!ifibss->ssid_len)
1649 return;
1650
1651 spin_lock_bh(lock: &ifibss->incomplete_lock);
1652 while (!list_empty(head: &ifibss->incomplete_stations)) {
1653 sta = list_first_entry(&ifibss->incomplete_stations,
1654 struct sta_info, list);
1655 list_del(entry: &sta->list);
1656 spin_unlock_bh(lock: &ifibss->incomplete_lock);
1657
1658 ieee80211_ibss_finish_sta(sta);
1659 rcu_read_unlock();
1660 spin_lock_bh(lock: &ifibss->incomplete_lock);
1661 }
1662 spin_unlock_bh(lock: &ifibss->incomplete_lock);
1663
1664 switch (ifibss->state) {
1665 case IEEE80211_IBSS_MLME_SEARCH:
1666 ieee80211_sta_find_ibss(sdata);
1667 break;
1668 case IEEE80211_IBSS_MLME_JOINED:
1669 ieee80211_sta_merge_ibss(sdata);
1670 break;
1671 default:
1672 WARN_ON(1);
1673 break;
1674 }
1675}
1676
1677static void ieee80211_ibss_timer(struct timer_list *t)
1678{
1679 struct ieee80211_sub_if_data *sdata =
1680 from_timer(sdata, t, u.ibss.timer);
1681
1682 wiphy_work_queue(wiphy: sdata->local->hw.wiphy, work: &sdata->work);
1683}
1684
1685void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1686{
1687 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1688
1689 timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0);
1690 INIT_LIST_HEAD(list: &ifibss->incomplete_stations);
1691 spin_lock_init(&ifibss->incomplete_lock);
1692 wiphy_work_init(work: &ifibss->csa_connection_drop_work,
1693 func: ieee80211_csa_connection_drop_work);
1694}
1695
1696/* scan finished notification */
1697void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1698{
1699 struct ieee80211_sub_if_data *sdata;
1700
1701 lockdep_assert_wiphy(local->hw.wiphy);
1702
1703 list_for_each_entry(sdata, &local->interfaces, list) {
1704 if (!ieee80211_sdata_running(sdata))
1705 continue;
1706 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1707 continue;
1708 sdata->u.ibss.last_scan_completed = jiffies;
1709 }
1710}
1711
1712int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1713 struct cfg80211_ibss_params *params)
1714{
1715 u64 changed = 0;
1716 u32 rate_flags;
1717 struct ieee80211_supported_band *sband;
1718 enum ieee80211_chanctx_mode chanmode;
1719 struct ieee80211_local *local = sdata->local;
1720 int radar_detect_width = 0;
1721 int i;
1722 int ret;
1723
1724 lockdep_assert_wiphy(local->hw.wiphy);
1725
1726 if (params->chandef.chan->freq_offset) {
1727 /* this may work, but is untested */
1728 return -EOPNOTSUPP;
1729 }
1730
1731 ret = cfg80211_chandef_dfs_required(wiphy: local->hw.wiphy,
1732 chandef: &params->chandef,
1733 iftype: sdata->wdev.iftype);
1734 if (ret < 0)
1735 return ret;
1736
1737 if (ret > 0) {
1738 if (!params->userspace_handles_dfs)
1739 return -EINVAL;
1740 radar_detect_width = BIT(params->chandef.width);
1741 }
1742
1743 chanmode = (params->channel_fixed && !ret) ?
1744 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1745
1746 ret = ieee80211_check_combinations(sdata, chandef: &params->chandef, chanmode,
1747 radar_detect: radar_detect_width);
1748 if (ret < 0)
1749 return ret;
1750
1751 if (params->bssid) {
1752 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1753 sdata->u.ibss.fixed_bssid = true;
1754 } else
1755 sdata->u.ibss.fixed_bssid = false;
1756
1757 sdata->u.ibss.privacy = params->privacy;
1758 sdata->u.ibss.control_port = params->control_port;
1759 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1760 sdata->u.ibss.basic_rates = params->basic_rates;
1761 sdata->u.ibss.last_scan_completed = jiffies;
1762
1763 /* fix basic_rates if channel does not support these rates */
1764 rate_flags = ieee80211_chandef_rate_flags(chandef: &params->chandef);
1765 sband = local->hw.wiphy->bands[params->chandef.chan->band];
1766 for (i = 0; i < sband->n_bitrates; i++) {
1767 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1768 sdata->u.ibss.basic_rates &= ~BIT(i);
1769 }
1770 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1771 sizeof(params->mcast_rate));
1772
1773 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1774
1775 sdata->u.ibss.chandef = params->chandef;
1776 sdata->u.ibss.fixed_channel = params->channel_fixed;
1777
1778 if (params->ie) {
1779 sdata->u.ibss.ie = kmemdup(p: params->ie, size: params->ie_len,
1780 GFP_KERNEL);
1781 if (sdata->u.ibss.ie)
1782 sdata->u.ibss.ie_len = params->ie_len;
1783 }
1784
1785 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1786 sdata->u.ibss.ibss_join_req = jiffies;
1787
1788 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1789 sdata->u.ibss.ssid_len = params->ssid_len;
1790
1791 memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1792 sizeof(sdata->u.ibss.ht_capa));
1793 memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1794 sizeof(sdata->u.ibss.ht_capa_mask));
1795
1796 /*
1797 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1798 * reserved, but an HT STA shall protect HT transmissions as though
1799 * the HT Protection field were set to non-HT mixed mode.
1800 *
1801 * In an IBSS, the RIFS Mode field of the HT Operation element is
1802 * also reserved, but an HT STA shall operate as though this field
1803 * were set to 1.
1804 */
1805
1806 sdata->vif.bss_conf.ht_operation_mode |=
1807 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1808 | IEEE80211_HT_PARAM_RIFS_MODE;
1809
1810 changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE;
1811 ieee80211_link_info_change_notify(sdata, link: &sdata->deflink, changed);
1812
1813 sdata->deflink.smps_mode = IEEE80211_SMPS_OFF;
1814 sdata->deflink.needed_rx_chains = local->rx_chains;
1815 sdata->control_port_over_nl80211 = params->control_port_over_nl80211;
1816
1817 wiphy_work_queue(wiphy: local->hw.wiphy, work: &sdata->work);
1818
1819 return 0;
1820}
1821
1822int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1823{
1824 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1825
1826 ieee80211_ibss_disconnect(sdata);
1827 ifibss->ssid_len = 0;
1828 eth_zero_addr(addr: ifibss->bssid);
1829
1830 /* remove beacon */
1831 kfree(objp: sdata->u.ibss.ie);
1832 sdata->u.ibss.ie = NULL;
1833 sdata->u.ibss.ie_len = 0;
1834
1835 /* on the next join, re-program HT parameters */
1836 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1837 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1838
1839 synchronize_rcu();
1840
1841 skb_queue_purge(list: &sdata->skb_queue);
1842
1843 del_timer_sync(timer: &sdata->u.ibss.timer);
1844
1845 return 0;
1846}
1847

source code of linux/net/mac80211/ibss.c