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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 int shift;
55
56
57 frame_len = sizeof(struct ieee80211_hdr_3addr) +
58 12 +
59 2 + IEEE80211_MAX_SSID_LEN +
60 2 + 8 +
61 3 +
62 4 +
63 5 +
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++;
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
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->cntdwn_counter_offsets[0] = (pos - presp->head);
149 *pos++ = csa_settings->count;
150 presp->cntdwn_current_counter = csa_settings->count;
151 }
152
153
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
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
188
189
190
191 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
192 chandef, 0, false);
193
194
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);
207
208 presp->head_len = pos - presp->head;
209 if (WARN_ON(presp->head_len > frame_len))
210 goto error;
211
212 return presp;
213error:
214 kfree(presp);
215 return NULL;
216}
217
218static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
219 const u8 *bssid, const int beacon_int,
220 struct cfg80211_chan_def *req_chandef,
221 const u32 basic_rates,
222 const u16 capability, u64 tsf,
223 bool creator)
224{
225 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
226 struct ieee80211_local *local = sdata->local;
227 struct ieee80211_mgmt *mgmt;
228 struct cfg80211_bss *bss;
229 u32 bss_change;
230 struct cfg80211_chan_def chandef;
231 struct ieee80211_channel *chan;
232 struct beacon_data *presp;
233 struct cfg80211_inform_bss bss_meta = {};
234 bool have_higher_than_11mbit;
235 bool radar_required;
236 int err;
237
238 sdata_assert_lock(sdata);
239
240
241 drv_reset_tsf(local, sdata);
242
243 if (!ether_addr_equal(ifibss->bssid, bssid))
244 sta_info_flush(sdata);
245
246
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
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
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
343
344
345
346
347
348
349
350
351 sdata->vif.bss_conf.use_short_slot = chan->band == NL80211_BAND_5GHZ;
352 bss_change |= BSS_CHANGED_ERP_SLOT;
353
354
355 if (chan->band == NL80211_BAND_2GHZ && have_higher_than_11mbit)
356 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
357 else
358 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
359
360 ieee80211_set_wmm_default(sdata, true, false);
361
362 sdata->vif.bss_conf.ibss_joined = true;
363 sdata->vif.bss_conf.ibss_creator = creator;
364
365 err = drv_join_ibss(local, sdata);
366 if (err) {
367 sdata->vif.bss_conf.ibss_joined = false;
368 sdata->vif.bss_conf.ibss_creator = false;
369 sdata->vif.bss_conf.enable_beacon = false;
370 sdata->vif.bss_conf.ssid_len = 0;
371 RCU_INIT_POINTER(ifibss->presp, NULL);
372 kfree_rcu(presp, rcu_head);
373 mutex_lock(&local->mtx);
374 ieee80211_vif_release_channel(sdata);
375 mutex_unlock(&local->mtx);
376 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
377 err);
378 return;
379 }
380
381 ieee80211_bss_info_change_notify(sdata, bss_change);
382
383 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
384 mod_timer(&ifibss->timer,
385 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
386
387 bss_meta.chan = chan;
388 bss_meta.scan_width = cfg80211_chandef_to_scan_width(&chandef);
389 bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt,
390 presp->head_len, GFP_KERNEL);
391
392 cfg80211_put_bss(local->hw.wiphy, bss);
393 netif_carrier_on(sdata->dev);
394 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
395}
396
397static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
398 struct ieee80211_bss *bss)
399{
400 struct cfg80211_bss *cbss =
401 container_of((void *)bss, struct cfg80211_bss, priv);
402 struct ieee80211_supported_band *sband;
403 struct cfg80211_chan_def chandef;
404 u32 basic_rates;
405 int i, j;
406 u16 beacon_int = cbss->beacon_interval;
407 const struct cfg80211_bss_ies *ies;
408 enum nl80211_channel_type chan_type;
409 u64 tsf;
410 u32 rate_flags;
411 int shift;
412
413 sdata_assert_lock(sdata);
414
415 if (beacon_int < 10)
416 beacon_int = 10;
417
418 switch (sdata->u.ibss.chandef.width) {
419 case NL80211_CHAN_WIDTH_20_NOHT:
420 case NL80211_CHAN_WIDTH_20:
421 case NL80211_CHAN_WIDTH_40:
422 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
423 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
424 break;
425 case NL80211_CHAN_WIDTH_5:
426 case NL80211_CHAN_WIDTH_10:
427 cfg80211_chandef_create(&chandef, cbss->channel,
428 NL80211_CHAN_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
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
483int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
484 struct cfg80211_csa_settings *csa_settings)
485{
486 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
487 struct beacon_data *presp, *old_presp;
488 struct cfg80211_bss *cbss;
489 const struct cfg80211_bss_ies *ies;
490 u16 capability = WLAN_CAPABILITY_IBSS;
491 u64 tsf;
492
493 sdata_assert_lock(sdata);
494
495 if (ifibss->privacy)
496 capability |= WLAN_CAPABILITY_PRIVACY;
497
498 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
499 ifibss->bssid, ifibss->ssid,
500 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS,
501 IEEE80211_PRIVACY(ifibss->privacy));
502
503 if (WARN_ON(!cbss))
504 return -EINVAL;
505
506 rcu_read_lock();
507 ies = rcu_dereference(cbss->ies);
508 tsf = ies->tsf;
509 rcu_read_unlock();
510 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
511
512 old_presp = rcu_dereference_protected(ifibss->presp,
513 lockdep_is_held(&sdata->wdev.mtx));
514
515 presp = ieee80211_ibss_build_presp(sdata,
516 sdata->vif.bss_conf.beacon_int,
517 sdata->vif.bss_conf.basic_rates,
518 capability, tsf, &ifibss->chandef,
519 NULL, csa_settings);
520 if (!presp)
521 return -ENOMEM;
522
523 rcu_assign_pointer(ifibss->presp, presp);
524 if (old_presp)
525 kfree_rcu(old_presp, rcu_head);
526
527 return BSS_CHANGED_BEACON;
528}
529
530int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
531{
532 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
533 struct cfg80211_bss *cbss;
534
535 sdata_assert_lock(sdata);
536
537
538 if (!is_zero_ether_addr(ifibss->bssid)) {
539 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
540 ifibss->chandef.chan,
541 ifibss->bssid, ifibss->ssid,
542 ifibss->ssid_len,
543 IEEE80211_BSS_TYPE_IBSS,
544 IEEE80211_PRIVACY(ifibss->privacy));
545
546 if (cbss) {
547 cbss->channel = sdata->csa_chandef.chan;
548 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
549 }
550 }
551
552 ifibss->chandef = sdata->csa_chandef;
553
554
555 return ieee80211_ibss_csa_beacon(sdata, NULL);
556}
557
558void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
559{
560 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
561
562 cancel_work_sync(&ifibss->csa_connection_drop_work);
563}
564
565static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
566 __acquires(RCU)
567{
568 struct ieee80211_sub_if_data *sdata = sta->sdata;
569 u8 addr[ETH_ALEN];
570
571 memcpy(addr, sta->sta.addr, ETH_ALEN);
572
573 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
574
575 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
576 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
577
578
579 if (!sta->sdata->u.ibss.control_port)
580 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
581
582 rate_control_rate_init(sta);
583
584
585 if (sta_info_insert_rcu(sta))
586 return sta_info_get(sdata, addr);
587 return sta;
588}
589
590static struct sta_info *
591ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
592 const u8 *addr, u32 supp_rates)
593 __acquires(RCU)
594{
595 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
596 struct ieee80211_local *local = sdata->local;
597 struct sta_info *sta;
598 struct ieee80211_chanctx_conf *chanctx_conf;
599 struct ieee80211_supported_band *sband;
600 enum nl80211_bss_scan_width scan_width;
601 int band;
602
603
604
605
606
607 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
608 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
609 sdata->name, addr);
610 rcu_read_lock();
611 return NULL;
612 }
613
614 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
615 rcu_read_lock();
616 return NULL;
617 }
618
619 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
620 rcu_read_lock();
621 return NULL;
622 }
623
624 rcu_read_lock();
625 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
626 if (WARN_ON_ONCE(!chanctx_conf))
627 return NULL;
628 band = chanctx_conf->def.chan->band;
629 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
630 rcu_read_unlock();
631
632 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
633 if (!sta) {
634 rcu_read_lock();
635 return NULL;
636 }
637
638
639 sband = local->hw.wiphy->bands[band];
640 sta->sta.supp_rates[band] = supp_rates |
641 ieee80211_mandatory_rates(sband, scan_width);
642
643 return ieee80211_ibss_finish_sta(sta);
644}
645
646static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
647{
648 struct ieee80211_local *local = sdata->local;
649 int active = 0;
650 struct sta_info *sta;
651
652 sdata_assert_lock(sdata);
653
654 rcu_read_lock();
655
656 list_for_each_entry_rcu(sta, &local->sta_list, list) {
657 unsigned long last_active = ieee80211_sta_last_active(sta);
658
659 if (sta->sdata == sdata &&
660 time_is_after_jiffies(last_active +
661 IEEE80211_IBSS_MERGE_INTERVAL)) {
662 active++;
663 break;
664 }
665 }
666
667 rcu_read_unlock();
668
669 return active;
670}
671
672static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
673{
674 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
675 struct ieee80211_local *local = sdata->local;
676 struct cfg80211_bss *cbss;
677 struct beacon_data *presp;
678 struct sta_info *sta;
679
680 if (!is_zero_ether_addr(ifibss->bssid)) {
681 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
682 ifibss->bssid, ifibss->ssid,
683 ifibss->ssid_len,
684 IEEE80211_BSS_TYPE_IBSS,
685 IEEE80211_PRIVACY(ifibss->privacy));
686
687 if (cbss) {
688 cfg80211_unlink_bss(local->hw.wiphy, cbss);
689 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
690 }
691 }
692
693 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
694
695 sta_info_flush(sdata);
696
697 spin_lock_bh(&ifibss->incomplete_lock);
698 while (!list_empty(&ifibss->incomplete_stations)) {
699 sta = list_first_entry(&ifibss->incomplete_stations,
700 struct sta_info, list);
701 list_del(&sta->list);
702 spin_unlock_bh(&ifibss->incomplete_lock);
703
704 sta_info_free(local, sta);
705 spin_lock_bh(&ifibss->incomplete_lock);
706 }
707 spin_unlock_bh(&ifibss->incomplete_lock);
708
709 netif_carrier_off(sdata->dev);
710
711 sdata->vif.bss_conf.ibss_joined = false;
712 sdata->vif.bss_conf.ibss_creator = false;
713 sdata->vif.bss_conf.enable_beacon = false;
714 sdata->vif.bss_conf.ssid_len = 0;
715
716
717 presp = rcu_dereference_protected(ifibss->presp,
718 lockdep_is_held(&sdata->wdev.mtx));
719 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
720 if (presp)
721 kfree_rcu(presp, rcu_head);
722
723 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
724 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
725 BSS_CHANGED_IBSS);
726 drv_leave_ibss(local, sdata);
727 mutex_lock(&local->mtx);
728 ieee80211_vif_release_channel(sdata);
729 mutex_unlock(&local->mtx);
730}
731
732static void ieee80211_csa_connection_drop_work(struct work_struct *work)
733{
734 struct ieee80211_sub_if_data *sdata =
735 container_of(work, struct ieee80211_sub_if_data,
736 u.ibss.csa_connection_drop_work);
737
738 sdata_lock(sdata);
739
740 ieee80211_ibss_disconnect(sdata);
741 synchronize_rcu();
742 skb_queue_purge(&sdata->skb_queue);
743
744
745 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
746
747 sdata_unlock(sdata);
748}
749
750static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
751{
752 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
753 int err;
754
755
756
757
758 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
759 &ifibss->chandef,
760 NL80211_IFTYPE_ADHOC);
761 if (err > 0)
762 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
763 GFP_ATOMIC);
764}
765
766static bool
767ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
768 struct ieee802_11_elems *elems,
769 bool beacon)
770{
771 struct cfg80211_csa_settings params;
772 struct ieee80211_csa_ie csa_ie;
773 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
774 enum nl80211_channel_type ch_type;
775 int err;
776 u32 sta_flags;
777 u32 vht_cap_info = 0;
778
779 sdata_assert_lock(sdata);
780
781 sta_flags = IEEE80211_STA_DISABLE_VHT;
782 switch (ifibss->chandef.width) {
783 case NL80211_CHAN_WIDTH_5:
784 case NL80211_CHAN_WIDTH_10:
785 case NL80211_CHAN_WIDTH_20_NOHT:
786 sta_flags |= IEEE80211_STA_DISABLE_HT;
787 fallthrough;
788 case NL80211_CHAN_WIDTH_20:
789 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
790 break;
791 default:
792 break;
793 }
794
795 if (elems->vht_cap_elem)
796 vht_cap_info = le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
797
798 memset(¶ms, 0, sizeof(params));
799 err = ieee80211_parse_ch_switch_ie(sdata, elems,
800 ifibss->chandef.chan->band,
801 vht_cap_info,
802 sta_flags, ifibss->bssid, &csa_ie);
803
804 if (err < 0)
805 goto disconnect;
806
807
808 if (err)
809 return false;
810
811
812 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
813 goto disconnect;
814
815 params.count = csa_ie.count;
816 params.chandef = csa_ie.chandef;
817
818 switch (ifibss->chandef.width) {
819 case NL80211_CHAN_WIDTH_20_NOHT:
820 case NL80211_CHAN_WIDTH_20:
821 case NL80211_CHAN_WIDTH_40:
822
823
824
825
826
827 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
828 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan,
829 ch_type);
830 break;
831 case NL80211_CHAN_WIDTH_5:
832 case NL80211_CHAN_WIDTH_10:
833 if (params.chandef.width != ifibss->chandef.width) {
834 sdata_info(sdata,
835 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
836 ifibss->bssid,
837 params.chandef.chan->center_freq,
838 params.chandef.width,
839 params.chandef.center_freq1,
840 params.chandef.center_freq2);
841 goto disconnect;
842 }
843 break;
844 default:
845
846 WARN_ON(1);
847 goto disconnect;
848 }
849
850 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef,
851 NL80211_IFTYPE_ADHOC)) {
852 sdata_info(sdata,
853 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
854 ifibss->bssid,
855 params.chandef.chan->center_freq,
856 params.chandef.width,
857 params.chandef.center_freq1,
858 params.chandef.center_freq2);
859 goto disconnect;
860 }
861
862 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
863 ¶ms.chandef,
864 NL80211_IFTYPE_ADHOC);
865 if (err < 0)
866 goto disconnect;
867 if (err > 0 && !ifibss->userspace_handles_dfs) {
868
869 goto disconnect;
870 }
871
872 params.radar_required = err;
873
874 if (cfg80211_chandef_identical(¶ms.chandef,
875 &sdata->vif.bss_conf.chandef)) {
876 ibss_dbg(sdata,
877 "received csa with an identical chandef, ignoring\n");
878 return true;
879 }
880
881
882 ibss_dbg(sdata,
883 "received channel switch announcement to go to channel %d MHz\n",
884 params.chandef.chan->center_freq);
885
886 params.block_tx = !!csa_ie.mode;
887
888 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
889 ¶ms))
890 goto disconnect;
891
892 ieee80211_ibss_csa_mark_radar(sdata);
893
894 return true;
895disconnect:
896 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
897 ieee80211_queue_work(&sdata->local->hw,
898 &ifibss->csa_connection_drop_work);
899
900 ieee80211_ibss_csa_mark_radar(sdata);
901
902 return true;
903}
904
905static void
906ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
907 struct ieee80211_mgmt *mgmt, size_t len,
908 struct ieee80211_rx_status *rx_status,
909 struct ieee802_11_elems *elems)
910{
911 int required_len;
912
913 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
914 return;
915
916
917 if (mgmt->u.action.u.measurement.action_code !=
918 WLAN_ACTION_SPCT_CHL_SWITCH)
919 return;
920
921 required_len = IEEE80211_MIN_ACTION_SIZE +
922 sizeof(mgmt->u.action.u.chan_switch);
923 if (len < required_len)
924 return;
925
926 if (!sdata->vif.csa_active)
927 ieee80211_ibss_process_chanswitch(sdata, elems, false);
928}
929
930static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
931 struct ieee80211_mgmt *mgmt,
932 size_t len)
933{
934 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
935
936 if (len < IEEE80211_DEAUTH_FRAME_LEN)
937 return;
938
939 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
940 ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason);
941 sta_info_destroy_addr(sdata, mgmt->sa);
942}
943
944static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
945 struct ieee80211_mgmt *mgmt,
946 size_t len)
947{
948 u16 auth_alg, auth_transaction;
949
950 sdata_assert_lock(sdata);
951
952 if (len < 24 + 6)
953 return;
954
955 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
956 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
957
958 ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
959 ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n",
960 mgmt->bssid, auth_transaction);
961
962 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
963 return;
964
965
966
967
968
969
970
971 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
972 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
973}
974
975static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
976 struct ieee80211_mgmt *mgmt, size_t len,
977 struct ieee80211_rx_status *rx_status,
978 struct ieee802_11_elems *elems,
979 struct ieee80211_channel *channel)
980{
981 struct sta_info *sta;
982 enum nl80211_band band = rx_status->band;
983 enum nl80211_bss_scan_width scan_width;
984 struct ieee80211_local *local = sdata->local;
985 struct ieee80211_supported_band *sband;
986 bool rates_updated = false;
987 u32 supp_rates = 0;
988
989 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
990 return;
991
992 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
993 return;
994
995 sband = local->hw.wiphy->bands[band];
996 if (WARN_ON(!sband))
997 return;
998
999 rcu_read_lock();
1000 sta = sta_info_get(sdata, mgmt->sa);
1001
1002 if (elems->supp_rates) {
1003 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1004 band, NULL);
1005 if (sta) {
1006 u32 prev_rates;
1007
1008 prev_rates = sta->sta.supp_rates[band];
1009
1010 scan_width = NL80211_BSS_CHAN_WIDTH_20;
1011 if (rx_status->bw == RATE_INFO_BW_5)
1012 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1013 else if (rx_status->bw == RATE_INFO_BW_10)
1014 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1015
1016 sta->sta.supp_rates[band] = supp_rates |
1017 ieee80211_mandatory_rates(sband, scan_width);
1018 if (sta->sta.supp_rates[band] != prev_rates) {
1019 ibss_dbg(sdata,
1020 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1021 sta->sta.addr, prev_rates,
1022 sta->sta.supp_rates[band]);
1023 rates_updated = true;
1024 }
1025 } else {
1026 rcu_read_unlock();
1027 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1028 mgmt->sa, supp_rates);
1029 }
1030 }
1031
1032 if (sta && !sta->sta.wme &&
1033 (elems->wmm_info || elems->s1g_capab) &&
1034 local->hw.queues >= IEEE80211_NUM_ACS) {
1035 sta->sta.wme = true;
1036 ieee80211_check_fast_xmit(sta);
1037 }
1038
1039 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1040 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1041 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1042 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1043
1044 struct ieee80211_ht_cap htcap_ie;
1045 struct cfg80211_chan_def chandef;
1046 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
1047
1048 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT);
1049 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef);
1050
1051 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1052 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1053 &htcap_ie,
1054 sta);
1055
1056 if (elems->vht_operation && elems->vht_cap_elem &&
1057 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1058 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1059
1060 struct ieee80211_vht_cap cap_ie;
1061 struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap;
1062 u32 vht_cap_info =
1063 le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
1064
1065 ieee80211_chandef_vht_oper(&local->hw, vht_cap_info,
1066 elems->vht_operation,
1067 elems->ht_operation,
1068 &chandef);
1069 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1070 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1071 &cap_ie, sta);
1072 if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap)))
1073 rates_updated |= true;
1074 }
1075
1076 if (bw != sta->sta.bandwidth)
1077 rates_updated |= true;
1078
1079 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1080 &chandef))
1081 WARN_ON_ONCE(1);
1082 }
1083
1084 if (sta && rates_updated) {
1085 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1086 u8 rx_nss = sta->sta.rx_nss;
1087
1088
1089 sta->sta.rx_nss = 0;
1090 rate_control_rate_init(sta);
1091 if (sta->sta.rx_nss != rx_nss)
1092 changed |= IEEE80211_RC_NSS_CHANGED;
1093
1094 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1095 }
1096
1097 rcu_read_unlock();
1098}
1099
1100static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1101 struct ieee80211_mgmt *mgmt, size_t len,
1102 struct ieee80211_rx_status *rx_status,
1103 struct ieee802_11_elems *elems)
1104{
1105 struct ieee80211_local *local = sdata->local;
1106 struct cfg80211_bss *cbss;
1107 struct ieee80211_bss *bss;
1108 struct ieee80211_channel *channel;
1109 u64 beacon_timestamp, rx_timestamp;
1110 u32 supp_rates = 0;
1111 enum nl80211_band band = rx_status->band;
1112
1113 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1114 if (!channel)
1115 return;
1116
1117 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1118
1119 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel);
1120 if (!bss)
1121 return;
1122
1123 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1124
1125
1126 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1127
1128
1129
1130
1131 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1132 goto put_bss;
1133
1134
1135 if (sdata->u.ibss.fixed_channel &&
1136 sdata->u.ibss.chandef.chan != cbss->channel)
1137 goto put_bss;
1138
1139
1140 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1141 memcmp(elems->ssid, sdata->u.ibss.ssid,
1142 sdata->u.ibss.ssid_len))
1143 goto put_bss;
1144
1145
1146 if (sdata->vif.csa_active ||
1147 ieee80211_ibss_process_chanswitch(sdata, elems, true))
1148 goto put_bss;
1149
1150
1151 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1152 goto put_bss;
1153
1154
1155 if (sdata->u.ibss.fixed_bssid)
1156 goto put_bss;
1157
1158 if (ieee80211_have_rx_timestamp(rx_status)) {
1159
1160 rx_timestamp =
1161 ieee80211_calculate_rx_timestamp(local, rx_status,
1162 len + FCS_LEN, 24);
1163 } else {
1164
1165
1166
1167
1168 rx_timestamp = drv_get_tsf(local, sdata);
1169 }
1170
1171 ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n",
1172 mgmt->sa, mgmt->bssid,
1173 (unsigned long long)rx_timestamp);
1174 ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n",
1175 (unsigned long long)beacon_timestamp,
1176 (unsigned long long)(rx_timestamp - beacon_timestamp),
1177 jiffies);
1178
1179 if (beacon_timestamp > rx_timestamp) {
1180 ibss_dbg(sdata,
1181 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1182 mgmt->bssid);
1183 ieee80211_sta_join_ibss(sdata, bss);
1184 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1185 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1186 supp_rates);
1187 rcu_read_unlock();
1188 }
1189
1190 put_bss:
1191 ieee80211_rx_bss_put(local, bss);
1192}
1193
1194void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1195 const u8 *bssid, const u8 *addr,
1196 u32 supp_rates)
1197{
1198 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1199 struct ieee80211_local *local = sdata->local;
1200 struct sta_info *sta;
1201 struct ieee80211_chanctx_conf *chanctx_conf;
1202 struct ieee80211_supported_band *sband;
1203 enum nl80211_bss_scan_width scan_width;
1204 int band;
1205
1206
1207
1208
1209
1210 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1211 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1212 sdata->name, addr);
1213 return;
1214 }
1215
1216 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1217 return;
1218
1219 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1220 return;
1221
1222 rcu_read_lock();
1223 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1224 if (WARN_ON_ONCE(!chanctx_conf)) {
1225 rcu_read_unlock();
1226 return;
1227 }
1228 band = chanctx_conf->def.chan->band;
1229 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1230 rcu_read_unlock();
1231
1232 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1233 if (!sta)
1234 return;
1235
1236
1237 sband = local->hw.wiphy->bands[band];
1238 sta->sta.supp_rates[band] = supp_rates |
1239 ieee80211_mandatory_rates(sband, scan_width);
1240
1241 spin_lock(&ifibss->incomplete_lock);
1242 list_add(&sta->list, &ifibss->incomplete_stations);
1243 spin_unlock(&ifibss->incomplete_lock);
1244 ieee80211_queue_work(&local->hw, &sdata->work);
1245}
1246
1247static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1248{
1249 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1250 struct ieee80211_local *local = sdata->local;
1251 struct sta_info *sta, *tmp;
1252 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1253 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1254
1255 mutex_lock(&local->sta_mtx);
1256
1257 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1258 unsigned long last_active = ieee80211_sta_last_active(sta);
1259
1260 if (sdata != sta->sdata)
1261 continue;
1262
1263 if (time_is_before_jiffies(last_active + exp_time) ||
1264 (time_is_before_jiffies(last_active + exp_rsn) &&
1265 sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1266 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
1267
1268 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1269 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1270 "not authorized " : "", sta->sta.addr);
1271
1272 ieee80211_send_deauth_disassoc(sdata, sta->sta.addr,
1273 ifibss->bssid,
1274 IEEE80211_STYPE_DEAUTH,
1275 WLAN_REASON_DEAUTH_LEAVING,
1276 true, frame_buf);
1277 WARN_ON(__sta_info_destroy(sta));
1278 }
1279 }
1280
1281 mutex_unlock(&local->sta_mtx);
1282}
1283
1284
1285
1286
1287
1288static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1289{
1290 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1291 enum nl80211_bss_scan_width scan_width;
1292
1293 sdata_assert_lock(sdata);
1294
1295 mod_timer(&ifibss->timer,
1296 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1297
1298 ieee80211_ibss_sta_expire(sdata);
1299
1300 if (time_before(jiffies, ifibss->last_scan_completed +
1301 IEEE80211_IBSS_MERGE_INTERVAL))
1302 return;
1303
1304 if (ieee80211_sta_active_ibss(sdata))
1305 return;
1306
1307 if (ifibss->fixed_channel)
1308 return;
1309
1310 sdata_info(sdata,
1311 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1312
1313 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1314 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1315 NULL, 0, scan_width);
1316}
1317
1318static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1319{
1320 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1321 u8 bssid[ETH_ALEN];
1322 u16 capability;
1323 int i;
1324
1325 sdata_assert_lock(sdata);
1326
1327 if (ifibss->fixed_bssid) {
1328 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1329 } else {
1330
1331
1332
1333 get_random_bytes(bssid, ETH_ALEN);
1334 for (i = 0; i < ETH_ALEN; i++)
1335 bssid[i] ^= sdata->vif.addr[i];
1336 bssid[0] &= ~0x01;
1337 bssid[0] |= 0x02;
1338 }
1339
1340 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1341
1342 capability = WLAN_CAPABILITY_IBSS;
1343
1344 if (ifibss->privacy)
1345 capability |= WLAN_CAPABILITY_PRIVACY;
1346
1347 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1348 &ifibss->chandef, ifibss->basic_rates,
1349 capability, 0, true);
1350}
1351
1352static unsigned ibss_setup_channels(struct wiphy *wiphy,
1353 struct ieee80211_channel **channels,
1354 unsigned int channels_max,
1355 u32 center_freq, u32 width)
1356{
1357 struct ieee80211_channel *chan = NULL;
1358 unsigned int n_chan = 0;
1359 u32 start_freq, end_freq, freq;
1360
1361 if (width <= 20) {
1362 start_freq = center_freq;
1363 end_freq = center_freq;
1364 } else {
1365 start_freq = center_freq - width / 2 + 10;
1366 end_freq = center_freq + width / 2 - 10;
1367 }
1368
1369 for (freq = start_freq; freq <= end_freq; freq += 20) {
1370 chan = ieee80211_get_channel(wiphy, freq);
1371 if (!chan)
1372 continue;
1373 if (n_chan >= channels_max)
1374 return n_chan;
1375
1376 channels[n_chan] = chan;
1377 n_chan++;
1378 }
1379
1380 return n_chan;
1381}
1382
1383static unsigned int
1384ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1385 const struct cfg80211_chan_def *chandef,
1386 struct ieee80211_channel **channels,
1387 unsigned int channels_max)
1388{
1389 unsigned int n_chan = 0;
1390 u32 width, cf1, cf2 = 0;
1391
1392 switch (chandef->width) {
1393 case NL80211_CHAN_WIDTH_40:
1394 width = 40;
1395 break;
1396 case NL80211_CHAN_WIDTH_80P80:
1397 cf2 = chandef->center_freq2;
1398 fallthrough;
1399 case NL80211_CHAN_WIDTH_80:
1400 width = 80;
1401 break;
1402 case NL80211_CHAN_WIDTH_160:
1403 width = 160;
1404 break;
1405 default:
1406 width = 20;
1407 break;
1408 }
1409
1410 cf1 = chandef->center_freq1;
1411
1412 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1413
1414 if (cf2)
1415 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1416 channels_max - n_chan, cf2,
1417 width);
1418
1419 return n_chan;
1420}
1421
1422
1423
1424
1425
1426static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1427{
1428 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1429 struct ieee80211_local *local = sdata->local;
1430 struct cfg80211_bss *cbss;
1431 struct ieee80211_channel *chan = NULL;
1432 const u8 *bssid = NULL;
1433 enum nl80211_bss_scan_width scan_width;
1434 int active_ibss;
1435
1436 sdata_assert_lock(sdata);
1437
1438 active_ibss = ieee80211_sta_active_ibss(sdata);
1439 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1440
1441 if (active_ibss)
1442 return;
1443
1444 if (ifibss->fixed_bssid)
1445 bssid = ifibss->bssid;
1446 if (ifibss->fixed_channel)
1447 chan = ifibss->chandef.chan;
1448 if (!is_zero_ether_addr(ifibss->bssid))
1449 bssid = ifibss->bssid;
1450 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1451 ifibss->ssid, ifibss->ssid_len,
1452 IEEE80211_BSS_TYPE_IBSS,
1453 IEEE80211_PRIVACY(ifibss->privacy));
1454
1455 if (cbss) {
1456 struct ieee80211_bss *bss;
1457
1458 bss = (void *)cbss->priv;
1459 ibss_dbg(sdata,
1460 "sta_find_ibss: selected %pM current %pM\n",
1461 cbss->bssid, ifibss->bssid);
1462 sdata_info(sdata,
1463 "Selected IBSS BSSID %pM based on configured SSID\n",
1464 cbss->bssid);
1465
1466 ieee80211_sta_join_ibss(sdata, bss);
1467 ieee80211_rx_bss_put(local, bss);
1468 return;
1469 }
1470
1471
1472
1473
1474 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1475 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1476 bssid);
1477 ieee80211_sta_create_ibss(sdata);
1478 return;
1479 }
1480
1481
1482 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1483
1484
1485 if (time_after(jiffies, ifibss->last_scan_completed +
1486 IEEE80211_SCAN_INTERVAL)) {
1487 struct ieee80211_channel *channels[8];
1488 unsigned int num;
1489
1490 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1491
1492 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1493
1494 if (ifibss->fixed_channel) {
1495 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1496 &ifibss->chandef,
1497 channels,
1498 ARRAY_SIZE(channels));
1499 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1500 ifibss->ssid_len, channels,
1501 num, scan_width);
1502 } else {
1503 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1504 ifibss->ssid_len, NULL,
1505 0, scan_width);
1506 }
1507 } else {
1508 int interval = IEEE80211_SCAN_INTERVAL;
1509
1510 if (time_after(jiffies, ifibss->ibss_join_req +
1511 IEEE80211_IBSS_JOIN_TIMEOUT))
1512 ieee80211_sta_create_ibss(sdata);
1513
1514 mod_timer(&ifibss->timer,
1515 round_jiffies(jiffies + interval));
1516 }
1517}
1518
1519static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1520 struct sk_buff *req)
1521{
1522 struct ieee80211_mgmt *mgmt = (void *)req->data;
1523 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1524 struct ieee80211_local *local = sdata->local;
1525 int tx_last_beacon, len = req->len;
1526 struct sk_buff *skb;
1527 struct beacon_data *presp;
1528 u8 *pos, *end;
1529
1530 sdata_assert_lock(sdata);
1531
1532 presp = rcu_dereference_protected(ifibss->presp,
1533 lockdep_is_held(&sdata->wdev.mtx));
1534
1535 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1536 len < 24 + 2 || !presp)
1537 return;
1538
1539 tx_last_beacon = drv_tx_last_beacon(local);
1540
1541 ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
1542 ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n",
1543 mgmt->bssid, tx_last_beacon);
1544
1545 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1546 return;
1547
1548 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1549 !is_broadcast_ether_addr(mgmt->bssid))
1550 return;
1551
1552 end = ((u8 *) mgmt) + len;
1553 pos = mgmt->u.probe_req.variable;
1554 if (pos[0] != WLAN_EID_SSID ||
1555 pos + 2 + pos[1] > end) {
1556 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1557 mgmt->sa);
1558 return;
1559 }
1560 if (pos[1] != 0 &&
1561 (pos[1] != ifibss->ssid_len ||
1562 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1563
1564 return;
1565 }
1566
1567
1568 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1569 if (!skb)
1570 return;
1571
1572 skb_reserve(skb, local->tx_headroom);
1573 skb_put_data(skb, presp->head, presp->head_len);
1574
1575 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1576 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1577 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1578
1579
1580 if (pos[1] == 0)
1581 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1582
1583 ieee80211_tx_skb(sdata, skb);
1584}
1585
1586static
1587void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1588 struct ieee80211_mgmt *mgmt, size_t len,
1589 struct ieee80211_rx_status *rx_status)
1590{
1591 size_t baselen;
1592 struct ieee802_11_elems elems;
1593
1594 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1595 offsetof(typeof(mgmt->u.beacon), variable));
1596
1597
1598
1599
1600
1601 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1602 if (baselen > len)
1603 return;
1604
1605 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1606 false, &elems, mgmt->bssid, NULL);
1607
1608 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1609}
1610
1611void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1612 struct sk_buff *skb)
1613{
1614 struct ieee80211_rx_status *rx_status;
1615 struct ieee80211_mgmt *mgmt;
1616 u16 fc;
1617 struct ieee802_11_elems elems;
1618 int ies_len;
1619
1620 rx_status = IEEE80211_SKB_RXCB(skb);
1621 mgmt = (struct ieee80211_mgmt *) skb->data;
1622 fc = le16_to_cpu(mgmt->frame_control);
1623
1624 sdata_lock(sdata);
1625
1626 if (!sdata->u.ibss.ssid_len)
1627 goto mgmt_out;
1628
1629 switch (fc & IEEE80211_FCTL_STYPE) {
1630 case IEEE80211_STYPE_PROBE_REQ:
1631 ieee80211_rx_mgmt_probe_req(sdata, skb);
1632 break;
1633 case IEEE80211_STYPE_PROBE_RESP:
1634 case IEEE80211_STYPE_BEACON:
1635 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1636 rx_status);
1637 break;
1638 case IEEE80211_STYPE_AUTH:
1639 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1640 break;
1641 case IEEE80211_STYPE_DEAUTH:
1642 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1643 break;
1644 case IEEE80211_STYPE_ACTION:
1645 switch (mgmt->u.action.category) {
1646 case WLAN_CATEGORY_SPECTRUM_MGMT:
1647 ies_len = skb->len -
1648 offsetof(struct ieee80211_mgmt,
1649 u.action.u.chan_switch.variable);
1650
1651 if (ies_len < 0)
1652 break;
1653
1654 ieee802_11_parse_elems(
1655 mgmt->u.action.u.chan_switch.variable,
1656 ies_len, true, &elems, mgmt->bssid, NULL);
1657
1658 if (elems.parse_error)
1659 break;
1660
1661 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1662 rx_status, &elems);
1663 break;
1664 }
1665 }
1666
1667 mgmt_out:
1668 sdata_unlock(sdata);
1669}
1670
1671void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1672{
1673 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1674 struct sta_info *sta;
1675
1676 sdata_lock(sdata);
1677
1678
1679
1680
1681
1682
1683 if (!ifibss->ssid_len)
1684 goto out;
1685
1686 spin_lock_bh(&ifibss->incomplete_lock);
1687 while (!list_empty(&ifibss->incomplete_stations)) {
1688 sta = list_first_entry(&ifibss->incomplete_stations,
1689 struct sta_info, list);
1690 list_del(&sta->list);
1691 spin_unlock_bh(&ifibss->incomplete_lock);
1692
1693 ieee80211_ibss_finish_sta(sta);
1694 rcu_read_unlock();
1695 spin_lock_bh(&ifibss->incomplete_lock);
1696 }
1697 spin_unlock_bh(&ifibss->incomplete_lock);
1698
1699 switch (ifibss->state) {
1700 case IEEE80211_IBSS_MLME_SEARCH:
1701 ieee80211_sta_find_ibss(sdata);
1702 break;
1703 case IEEE80211_IBSS_MLME_JOINED:
1704 ieee80211_sta_merge_ibss(sdata);
1705 break;
1706 default:
1707 WARN_ON(1);
1708 break;
1709 }
1710
1711 out:
1712 sdata_unlock(sdata);
1713}
1714
1715static void ieee80211_ibss_timer(struct timer_list *t)
1716{
1717 struct ieee80211_sub_if_data *sdata =
1718 from_timer(sdata, t, u.ibss.timer);
1719
1720 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1721}
1722
1723void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1724{
1725 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1726
1727 timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0);
1728 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1729 spin_lock_init(&ifibss->incomplete_lock);
1730 INIT_WORK(&ifibss->csa_connection_drop_work,
1731 ieee80211_csa_connection_drop_work);
1732}
1733
1734
1735void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1736{
1737 struct ieee80211_sub_if_data *sdata;
1738
1739 mutex_lock(&local->iflist_mtx);
1740 list_for_each_entry(sdata, &local->interfaces, list) {
1741 if (!ieee80211_sdata_running(sdata))
1742 continue;
1743 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1744 continue;
1745 sdata->u.ibss.last_scan_completed = jiffies;
1746 }
1747 mutex_unlock(&local->iflist_mtx);
1748}
1749
1750int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1751 struct cfg80211_ibss_params *params)
1752{
1753 u32 changed = 0;
1754 u32 rate_flags;
1755 struct ieee80211_supported_band *sband;
1756 enum ieee80211_chanctx_mode chanmode;
1757 struct ieee80211_local *local = sdata->local;
1758 int radar_detect_width = 0;
1759 int i;
1760 int ret;
1761
1762 if (params->chandef.chan->freq_offset) {
1763
1764 return -EOPNOTSUPP;
1765 }
1766
1767 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1768 ¶ms->chandef,
1769 sdata->wdev.iftype);
1770 if (ret < 0)
1771 return ret;
1772
1773 if (ret > 0) {
1774 if (!params->userspace_handles_dfs)
1775 return -EINVAL;
1776 radar_detect_width = BIT(params->chandef.width);
1777 }
1778
1779 chanmode = (params->channel_fixed && !ret) ?
1780 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1781
1782 mutex_lock(&local->chanctx_mtx);
1783 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode,
1784 radar_detect_width);
1785 mutex_unlock(&local->chanctx_mtx);
1786 if (ret < 0)
1787 return ret;
1788
1789 if (params->bssid) {
1790 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1791 sdata->u.ibss.fixed_bssid = true;
1792 } else
1793 sdata->u.ibss.fixed_bssid = false;
1794
1795 sdata->u.ibss.privacy = params->privacy;
1796 sdata->u.ibss.control_port = params->control_port;
1797 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1798 sdata->u.ibss.basic_rates = params->basic_rates;
1799 sdata->u.ibss.last_scan_completed = jiffies;
1800
1801
1802 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef);
1803 sband = local->hw.wiphy->bands[params->chandef.chan->band];
1804 for (i = 0; i < sband->n_bitrates; i++) {
1805 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1806 sdata->u.ibss.basic_rates &= ~BIT(i);
1807 }
1808 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1809 sizeof(params->mcast_rate));
1810
1811 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1812
1813 sdata->u.ibss.chandef = params->chandef;
1814 sdata->u.ibss.fixed_channel = params->channel_fixed;
1815
1816 if (params->ie) {
1817 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1818 GFP_KERNEL);
1819 if (sdata->u.ibss.ie)
1820 sdata->u.ibss.ie_len = params->ie_len;
1821 }
1822
1823 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1824 sdata->u.ibss.ibss_join_req = jiffies;
1825
1826 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1827 sdata->u.ibss.ssid_len = params->ssid_len;
1828
1829 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa,
1830 sizeof(sdata->u.ibss.ht_capa));
1831 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask,
1832 sizeof(sdata->u.ibss.ht_capa_mask));
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844 sdata->vif.bss_conf.ht_operation_mode |=
1845 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1846 | IEEE80211_HT_PARAM_RIFS_MODE;
1847
1848 changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE;
1849 ieee80211_bss_info_change_notify(sdata, changed);
1850
1851 sdata->smps_mode = IEEE80211_SMPS_OFF;
1852 sdata->needed_rx_chains = local->rx_chains;
1853 sdata->control_port_over_nl80211 = params->control_port_over_nl80211;
1854
1855 ieee80211_queue_work(&local->hw, &sdata->work);
1856
1857 return 0;
1858}
1859
1860int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1861{
1862 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1863
1864 ieee80211_ibss_disconnect(sdata);
1865 ifibss->ssid_len = 0;
1866 eth_zero_addr(ifibss->bssid);
1867
1868
1869 kfree(sdata->u.ibss.ie);
1870 sdata->u.ibss.ie = NULL;
1871 sdata->u.ibss.ie_len = 0;
1872
1873
1874 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1875 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1876
1877 synchronize_rcu();
1878
1879 skb_queue_purge(&sdata->skb_queue);
1880
1881 del_timer_sync(&sdata->u.ibss.timer);
1882
1883 return 0;
1884}
1885
