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17#include <linux/delay.h>
18#include <linux/slab.h>
19#include <linux/if_ether.h>
20#include <linux/skbuff.h>
21#include <linux/if_arp.h>
22#include <linux/etherdevice.h>
23#include <linux/rtnetlink.h>
24#include <net/mac80211.h>
25
26#include "ieee80211_i.h"
27#include "driver-ops.h"
28#include "rate.h"
29
30#define IEEE80211_SCAN_INTERVAL (2 * HZ)
31#define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
32
33#define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
34#define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
35#define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ)
36
37#define IEEE80211_IBSS_MAX_STA_ENTRIES 128
38
39static struct beacon_data *
40ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata,
41 const int beacon_int, const u32 basic_rates,
42 const u16 capability, u64 tsf,
43 struct cfg80211_chan_def *chandef,
44 bool *have_higher_than_11mbit,
45 struct cfg80211_csa_settings *csa_settings)
46{
47 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
48 struct ieee80211_local *local = sdata->local;
49 int rates_n = 0, i, ri;
50 struct ieee80211_mgmt *mgmt;
51 u8 *pos;
52 struct ieee80211_supported_band *sband;
53 u32 rate_flags, rates = 0, rates_added = 0;
54 struct beacon_data *presp;
55 int frame_len;
56 int shift;
57
58
59 frame_len = sizeof(struct ieee80211_hdr_3addr) +
60 12 +
61 2 + IEEE80211_MAX_SSID_LEN +
62 2 + 8 +
63 3 +
64 4 +
65 5 +
66 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
67 2 + sizeof(struct ieee80211_ht_cap) +
68 2 + sizeof(struct ieee80211_ht_operation) +
69 ifibss->ie_len;
70 presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
71 if (!presp)
72 return NULL;
73
74 presp->head = (void *)(presp + 1);
75
76 mgmt = (void *) presp->head;
77 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
78 IEEE80211_STYPE_PROBE_RESP);
79 eth_broadcast_addr(mgmt->da);
80 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
81 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
82 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
83 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
84 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
85
86 pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
87
88 *pos++ = WLAN_EID_SSID;
89 *pos++ = ifibss->ssid_len;
90 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
91 pos += ifibss->ssid_len;
92
93 sband = local->hw.wiphy->bands[chandef->chan->band];
94 rate_flags = ieee80211_chandef_rate_flags(chandef);
95 shift = ieee80211_chandef_get_shift(chandef);
96 rates_n = 0;
97 if (have_higher_than_11mbit)
98 *have_higher_than_11mbit = false;
99
100 for (i = 0; i < sband->n_bitrates; i++) {
101 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
102 continue;
103 if (sband->bitrates[i].bitrate > 110 &&
104 have_higher_than_11mbit)
105 *have_higher_than_11mbit = true;
106
107 rates |= BIT(i);
108 rates_n++;
109 }
110
111 *pos++ = WLAN_EID_SUPP_RATES;
112 *pos++ = min_t(int, 8, rates_n);
113 for (ri = 0; ri < sband->n_bitrates; ri++) {
114 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
115 5 * (1 << shift));
116 u8 basic = 0;
117 if (!(rates & BIT(ri)))
118 continue;
119
120 if (basic_rates & BIT(ri))
121 basic = 0x80;
122 *pos++ = basic | (u8) rate;
123 if (++rates_added == 8) {
124 ri++;
125 break;
126 }
127 }
128
129 if (sband->band == IEEE80211_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->csa_counter_offsets[0] = (pos - presp->head);
149 *pos++ = csa_settings->count;
150 presp->csa_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 == IEEE80211_BAND_5GHZ;
352 bss_change |= BSS_CHANGED_ERP_SLOT;
353
354
355 if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit)
356 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
357 else
358 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
359
360 ieee80211_set_wmm_default(sdata, true, false);
361
362 sdata->vif.bss_conf.ibss_joined = true;
363 sdata->vif.bss_conf.ibss_creator = creator;
364
365 err = drv_join_ibss(local, sdata);
366 if (err) {
367 sdata->vif.bss_conf.ibss_joined = false;
368 sdata->vif.bss_conf.ibss_creator = false;
369 sdata->vif.bss_conf.enable_beacon = false;
370 sdata->vif.bss_conf.ssid_len = 0;
371 RCU_INIT_POINTER(ifibss->presp, NULL);
372 kfree_rcu(presp, rcu_head);
373 mutex_lock(&local->mtx);
374 ieee80211_vif_release_channel(sdata);
375 mutex_unlock(&local->mtx);
376 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
377 err);
378 return;
379 }
380
381 ieee80211_bss_info_change_notify(sdata, bss_change);
382
383 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
384 mod_timer(&ifibss->timer,
385 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
386
387 bss_meta.chan = chan;
388 bss_meta.scan_width = cfg80211_chandef_to_scan_width(&chandef);
389 bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt,
390 presp->head_len, GFP_KERNEL);
391
392 cfg80211_put_bss(local->hw.wiphy, bss);
393 netif_carrier_on(sdata->dev);
394 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
395}
396
397static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
398 struct ieee80211_bss *bss)
399{
400 struct cfg80211_bss *cbss =
401 container_of((void *)bss, struct cfg80211_bss, priv);
402 struct ieee80211_supported_band *sband;
403 struct cfg80211_chan_def chandef;
404 u32 basic_rates;
405 int i, j;
406 u16 beacon_int = cbss->beacon_interval;
407 const struct cfg80211_bss_ies *ies;
408 enum nl80211_channel_type chan_type;
409 u64 tsf;
410 u32 rate_flags;
411 int shift;
412
413 sdata_assert_lock(sdata);
414
415 if (beacon_int < 10)
416 beacon_int = 10;
417
418 switch (sdata->u.ibss.chandef.width) {
419 case NL80211_CHAN_WIDTH_20_NOHT:
420 case NL80211_CHAN_WIDTH_20:
421 case NL80211_CHAN_WIDTH_40:
422 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
423 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
424 break;
425 case NL80211_CHAN_WIDTH_5:
426 case NL80211_CHAN_WIDTH_10:
427 cfg80211_chandef_create(&chandef, cbss->channel,
428 NL80211_CHAN_WIDTH_20_NOHT);
429 chandef.width = sdata->u.ibss.chandef.width;
430 break;
431 case NL80211_CHAN_WIDTH_80:
432 case NL80211_CHAN_WIDTH_80P80:
433 case NL80211_CHAN_WIDTH_160:
434 chandef = sdata->u.ibss.chandef;
435 chandef.chan = cbss->channel;
436 break;
437 default:
438
439 cfg80211_chandef_create(&chandef, cbss->channel,
440 NL80211_CHAN_WIDTH_20_NOHT);
441 break;
442 }
443
444 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
445 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
446 shift = ieee80211_vif_get_shift(&sdata->vif);
447
448 basic_rates = 0;
449
450 for (i = 0; i < bss->supp_rates_len; i++) {
451 int rate = bss->supp_rates[i] & 0x7f;
452 bool is_basic = !!(bss->supp_rates[i] & 0x80);
453
454 for (j = 0; j < sband->n_bitrates; j++) {
455 int brate;
456 if ((rate_flags & sband->bitrates[j].flags)
457 != rate_flags)
458 continue;
459
460 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
461 5 * (1 << shift));
462 if (brate == rate) {
463 if (is_basic)
464 basic_rates |= BIT(j);
465 break;
466 }
467 }
468 }
469
470 rcu_read_lock();
471 ies = rcu_dereference(cbss->ies);
472 tsf = ies->tsf;
473 rcu_read_unlock();
474
475 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
476 beacon_int,
477 &chandef,
478 basic_rates,
479 cbss->capability,
480 tsf, false);
481}
482
483int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
484 struct cfg80211_csa_settings *csa_settings)
485{
486 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
487 struct beacon_data *presp, *old_presp;
488 struct cfg80211_bss *cbss;
489 const struct cfg80211_bss_ies *ies;
490 u16 capability = 0;
491 u64 tsf;
492 int ret = 0;
493
494 sdata_assert_lock(sdata);
495
496 if (ifibss->privacy)
497 capability = WLAN_CAPABILITY_PRIVACY;
498
499 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
500 ifibss->bssid, ifibss->ssid,
501 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS,
502 IEEE80211_PRIVACY(ifibss->privacy));
503
504 if (WARN_ON(!cbss)) {
505 ret = -EINVAL;
506 goto out;
507 }
508
509 rcu_read_lock();
510 ies = rcu_dereference(cbss->ies);
511 tsf = ies->tsf;
512 rcu_read_unlock();
513 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
514
515 old_presp = rcu_dereference_protected(ifibss->presp,
516 lockdep_is_held(&sdata->wdev.mtx));
517
518 presp = ieee80211_ibss_build_presp(sdata,
519 sdata->vif.bss_conf.beacon_int,
520 sdata->vif.bss_conf.basic_rates,
521 capability, tsf, &ifibss->chandef,
522 NULL, csa_settings);
523 if (!presp) {
524 ret = -ENOMEM;
525 goto out;
526 }
527
528 rcu_assign_pointer(ifibss->presp, presp);
529 if (old_presp)
530 kfree_rcu(old_presp, rcu_head);
531
532 return BSS_CHANGED_BEACON;
533 out:
534 return ret;
535}
536
537int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
538{
539 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
540 struct cfg80211_bss *cbss;
541 int err, changed = 0;
542
543 sdata_assert_lock(sdata);
544
545
546 if (!is_zero_ether_addr(ifibss->bssid)) {
547 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
548 ifibss->chandef.chan,
549 ifibss->bssid, ifibss->ssid,
550 ifibss->ssid_len,
551 IEEE80211_BSS_TYPE_IBSS,
552 IEEE80211_PRIVACY(ifibss->privacy));
553
554 if (cbss) {
555 cbss->channel = sdata->csa_chandef.chan;
556 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
557 }
558 }
559
560 ifibss->chandef = sdata->csa_chandef;
561
562
563 err = ieee80211_ibss_csa_beacon(sdata, NULL);
564 if (err < 0)
565 return err;
566
567 changed |= err;
568
569 return changed;
570}
571
572void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
573{
574 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
575
576 cancel_work_sync(&ifibss->csa_connection_drop_work);
577}
578
579static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
580 __acquires(RCU)
581{
582 struct ieee80211_sub_if_data *sdata = sta->sdata;
583 u8 addr[ETH_ALEN];
584
585 memcpy(addr, sta->sta.addr, ETH_ALEN);
586
587 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
588
589 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
590 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
591
592
593 if (!sta->sdata->u.ibss.control_port)
594 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
595
596 rate_control_rate_init(sta);
597
598
599 if (sta_info_insert_rcu(sta))
600 return sta_info_get(sdata, addr);
601 return sta;
602}
603
604static struct sta_info *
605ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
606 const u8 *addr, u32 supp_rates)
607 __acquires(RCU)
608{
609 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
610 struct ieee80211_local *local = sdata->local;
611 struct sta_info *sta;
612 struct ieee80211_chanctx_conf *chanctx_conf;
613 struct ieee80211_supported_band *sband;
614 enum nl80211_bss_scan_width scan_width;
615 int band;
616
617
618
619
620
621 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
622 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
623 sdata->name, addr);
624 rcu_read_lock();
625 return NULL;
626 }
627
628 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
629 rcu_read_lock();
630 return NULL;
631 }
632
633 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
634 rcu_read_lock();
635 return NULL;
636 }
637
638 rcu_read_lock();
639 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
640 if (WARN_ON_ONCE(!chanctx_conf))
641 return NULL;
642 band = chanctx_conf->def.chan->band;
643 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
644 rcu_read_unlock();
645
646 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
647 if (!sta) {
648 rcu_read_lock();
649 return NULL;
650 }
651
652 sta->rx_stats.last_rx = jiffies;
653
654
655 sband = local->hw.wiphy->bands[band];
656 sta->sta.supp_rates[band] = supp_rates |
657 ieee80211_mandatory_rates(sband, scan_width);
658
659 return ieee80211_ibss_finish_sta(sta);
660}
661
662static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
663{
664 struct ieee80211_local *local = sdata->local;
665 int active = 0;
666 struct sta_info *sta;
667
668 sdata_assert_lock(sdata);
669
670 rcu_read_lock();
671
672 list_for_each_entry_rcu(sta, &local->sta_list, list) {
673 if (sta->sdata == sdata &&
674 time_after(sta->rx_stats.last_rx +
675 IEEE80211_IBSS_MERGE_INTERVAL,
676 jiffies)) {
677 active++;
678 break;
679 }
680 }
681
682 rcu_read_unlock();
683
684 return active;
685}
686
687static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
688{
689 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
690 struct ieee80211_local *local = sdata->local;
691 struct cfg80211_bss *cbss;
692 struct beacon_data *presp;
693 struct sta_info *sta;
694
695 if (!is_zero_ether_addr(ifibss->bssid)) {
696 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
697 ifibss->bssid, ifibss->ssid,
698 ifibss->ssid_len,
699 IEEE80211_BSS_TYPE_IBSS,
700 IEEE80211_PRIVACY(ifibss->privacy));
701
702 if (cbss) {
703 cfg80211_unlink_bss(local->hw.wiphy, cbss);
704 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
705 }
706 }
707
708 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
709
710 sta_info_flush(sdata);
711
712 spin_lock_bh(&ifibss->incomplete_lock);
713 while (!list_empty(&ifibss->incomplete_stations)) {
714 sta = list_first_entry(&ifibss->incomplete_stations,
715 struct sta_info, list);
716 list_del(&sta->list);
717 spin_unlock_bh(&ifibss->incomplete_lock);
718
719 sta_info_free(local, sta);
720 spin_lock_bh(&ifibss->incomplete_lock);
721 }
722 spin_unlock_bh(&ifibss->incomplete_lock);
723
724 netif_carrier_off(sdata->dev);
725
726 sdata->vif.bss_conf.ibss_joined = false;
727 sdata->vif.bss_conf.ibss_creator = false;
728 sdata->vif.bss_conf.enable_beacon = false;
729 sdata->vif.bss_conf.ssid_len = 0;
730
731
732 presp = rcu_dereference_protected(ifibss->presp,
733 lockdep_is_held(&sdata->wdev.mtx));
734 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
735 if (presp)
736 kfree_rcu(presp, rcu_head);
737
738 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
739 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
740 BSS_CHANGED_IBSS);
741 drv_leave_ibss(local, sdata);
742 mutex_lock(&local->mtx);
743 ieee80211_vif_release_channel(sdata);
744 mutex_unlock(&local->mtx);
745}
746
747static void ieee80211_csa_connection_drop_work(struct work_struct *work)
748{
749 struct ieee80211_sub_if_data *sdata =
750 container_of(work, struct ieee80211_sub_if_data,
751 u.ibss.csa_connection_drop_work);
752
753 sdata_lock(sdata);
754
755 ieee80211_ibss_disconnect(sdata);
756 synchronize_rcu();
757 skb_queue_purge(&sdata->skb_queue);
758
759
760 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
761
762 sdata_unlock(sdata);
763}
764
765static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
766{
767 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
768 int err;
769
770
771
772
773 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
774 &ifibss->chandef,
775 NL80211_IFTYPE_ADHOC);
776 if (err > 0)
777 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
778 GFP_ATOMIC);
779}
780
781static bool
782ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
783 struct ieee802_11_elems *elems,
784 bool beacon)
785{
786 struct cfg80211_csa_settings params;
787 struct ieee80211_csa_ie csa_ie;
788 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
789 enum nl80211_channel_type ch_type;
790 int err;
791 u32 sta_flags;
792
793 sdata_assert_lock(sdata);
794
795 sta_flags = IEEE80211_STA_DISABLE_VHT;
796 switch (ifibss->chandef.width) {
797 case NL80211_CHAN_WIDTH_5:
798 case NL80211_CHAN_WIDTH_10:
799 case NL80211_CHAN_WIDTH_20_NOHT:
800 sta_flags |= IEEE80211_STA_DISABLE_HT;
801
802 case NL80211_CHAN_WIDTH_20:
803 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
804 break;
805 default:
806 break;
807 }
808
809 memset(¶ms, 0, sizeof(params));
810 memset(&csa_ie, 0, sizeof(csa_ie));
811 err = ieee80211_parse_ch_switch_ie(sdata, elems,
812 ifibss->chandef.chan->band,
813 sta_flags, ifibss->bssid, &csa_ie);
814
815 if (err < 0)
816 goto disconnect;
817
818
819 if (err)
820 return false;
821
822
823 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
824 goto disconnect;
825
826 params.count = csa_ie.count;
827 params.chandef = csa_ie.chandef;
828
829 switch (ifibss->chandef.width) {
830 case NL80211_CHAN_WIDTH_20_NOHT:
831 case NL80211_CHAN_WIDTH_20:
832 case NL80211_CHAN_WIDTH_40:
833
834
835
836
837
838 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
839 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan,
840 ch_type);
841 break;
842 case NL80211_CHAN_WIDTH_5:
843 case NL80211_CHAN_WIDTH_10:
844 if (params.chandef.width != ifibss->chandef.width) {
845 sdata_info(sdata,
846 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
847 ifibss->bssid,
848 params.chandef.chan->center_freq,
849 params.chandef.width,
850 params.chandef.center_freq1,
851 params.chandef.center_freq2);
852 goto disconnect;
853 }
854 break;
855 default:
856
857 WARN_ON(1);
858 goto disconnect;
859 }
860
861 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef,
862 NL80211_IFTYPE_ADHOC)) {
863 sdata_info(sdata,
864 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
865 ifibss->bssid,
866 params.chandef.chan->center_freq,
867 params.chandef.width,
868 params.chandef.center_freq1,
869 params.chandef.center_freq2);
870 goto disconnect;
871 }
872
873 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
874 ¶ms.chandef,
875 NL80211_IFTYPE_ADHOC);
876 if (err < 0)
877 goto disconnect;
878 if (err > 0 && !ifibss->userspace_handles_dfs) {
879
880 goto disconnect;
881 }
882
883 params.radar_required = err;
884
885 if (cfg80211_chandef_identical(¶ms.chandef,
886 &sdata->vif.bss_conf.chandef)) {
887 ibss_dbg(sdata,
888 "received csa with an identical chandef, ignoring\n");
889 return true;
890 }
891
892
893 ibss_dbg(sdata,
894 "received channel switch announcement to go to channel %d MHz\n",
895 params.chandef.chan->center_freq);
896
897 params.block_tx = !!csa_ie.mode;
898
899 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
900 ¶ms))
901 goto disconnect;
902
903 ieee80211_ibss_csa_mark_radar(sdata);
904
905 return true;
906disconnect:
907 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
908 ieee80211_queue_work(&sdata->local->hw,
909 &ifibss->csa_connection_drop_work);
910
911 ieee80211_ibss_csa_mark_radar(sdata);
912
913 return true;
914}
915
916static void
917ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
918 struct ieee80211_mgmt *mgmt, size_t len,
919 struct ieee80211_rx_status *rx_status,
920 struct ieee802_11_elems *elems)
921{
922 int required_len;
923
924 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
925 return;
926
927
928 if (mgmt->u.action.u.measurement.action_code !=
929 WLAN_ACTION_SPCT_CHL_SWITCH)
930 return;
931
932 required_len = IEEE80211_MIN_ACTION_SIZE +
933 sizeof(mgmt->u.action.u.chan_switch);
934 if (len < required_len)
935 return;
936
937 if (!sdata->vif.csa_active)
938 ieee80211_ibss_process_chanswitch(sdata, elems, false);
939}
940
941static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
942 struct ieee80211_mgmt *mgmt,
943 size_t len)
944{
945 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
946
947 if (len < IEEE80211_DEAUTH_FRAME_LEN)
948 return;
949
950 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
951 mgmt->sa, mgmt->da, mgmt->bssid, reason);
952 sta_info_destroy_addr(sdata, mgmt->sa);
953}
954
955static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
956 struct ieee80211_mgmt *mgmt,
957 size_t len)
958{
959 u16 auth_alg, auth_transaction;
960
961 sdata_assert_lock(sdata);
962
963 if (len < 24 + 6)
964 return;
965
966 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
967 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
968
969 ibss_dbg(sdata,
970 "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
971 mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
972
973 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
974 return;
975
976
977
978
979
980
981
982 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
983 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
984}
985
986static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
987 struct ieee80211_mgmt *mgmt, size_t len,
988 struct ieee80211_rx_status *rx_status,
989 struct ieee802_11_elems *elems,
990 struct ieee80211_channel *channel)
991{
992 struct sta_info *sta;
993 enum ieee80211_band band = rx_status->band;
994 enum nl80211_bss_scan_width scan_width;
995 struct ieee80211_local *local = sdata->local;
996 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
997 bool rates_updated = false;
998 u32 supp_rates = 0;
999
1000 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1001 return;
1002
1003 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
1004 return;
1005
1006 rcu_read_lock();
1007 sta = sta_info_get(sdata, mgmt->sa);
1008
1009 if (elems->supp_rates) {
1010 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1011 band, NULL);
1012 if (sta) {
1013 u32 prev_rates;
1014
1015 prev_rates = sta->sta.supp_rates[band];
1016
1017 scan_width = NL80211_BSS_CHAN_WIDTH_20;
1018 if (rx_status->flag & RX_FLAG_5MHZ)
1019 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1020 if (rx_status->flag & RX_FLAG_10MHZ)
1021 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1022
1023 sta->sta.supp_rates[band] = supp_rates |
1024 ieee80211_mandatory_rates(sband, scan_width);
1025 if (sta->sta.supp_rates[band] != prev_rates) {
1026 ibss_dbg(sdata,
1027 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1028 sta->sta.addr, prev_rates,
1029 sta->sta.supp_rates[band]);
1030 rates_updated = true;
1031 }
1032 } else {
1033 rcu_read_unlock();
1034 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1035 mgmt->sa, supp_rates);
1036 }
1037 }
1038
1039 if (sta && !sta->sta.wme &&
1040 elems->wmm_info && local->hw.queues >= IEEE80211_NUM_ACS) {
1041 sta->sta.wme = true;
1042 ieee80211_check_fast_xmit(sta);
1043 }
1044
1045 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1046 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1047 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1048 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1049
1050 struct ieee80211_ht_cap htcap_ie;
1051 struct cfg80211_chan_def chandef;
1052 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
1053
1054 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT);
1055 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef);
1056
1057 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1058 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1059 &htcap_ie,
1060 sta);
1061
1062 if (elems->vht_operation && elems->vht_cap_elem &&
1063 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1064 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1065
1066 struct ieee80211_vht_cap cap_ie;
1067 struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap;
1068
1069 ieee80211_chandef_vht_oper(elems->vht_operation,
1070 &chandef);
1071 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1072 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1073 &cap_ie, sta);
1074 if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap)))
1075 rates_updated |= true;
1076 }
1077
1078 if (bw != sta->sta.bandwidth)
1079 rates_updated |= true;
1080
1081 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1082 &chandef))
1083 WARN_ON_ONCE(1);
1084 }
1085
1086 if (sta && rates_updated) {
1087 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1088 u8 rx_nss = sta->sta.rx_nss;
1089
1090
1091 sta->sta.rx_nss = 0;
1092 rate_control_rate_init(sta);
1093 if (sta->sta.rx_nss != rx_nss)
1094 changed |= IEEE80211_RC_NSS_CHANGED;
1095
1096 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1097 }
1098
1099 rcu_read_unlock();
1100}
1101
1102static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1103 struct ieee80211_mgmt *mgmt, size_t len,
1104 struct ieee80211_rx_status *rx_status,
1105 struct ieee802_11_elems *elems)
1106{
1107 struct ieee80211_local *local = sdata->local;
1108 struct cfg80211_bss *cbss;
1109 struct ieee80211_bss *bss;
1110 struct ieee80211_channel *channel;
1111 u64 beacon_timestamp, rx_timestamp;
1112 u32 supp_rates = 0;
1113 enum ieee80211_band band = rx_status->band;
1114
1115 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1116 if (!channel)
1117 return;
1118
1119 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1120
1121 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1122 channel);
1123 if (!bss)
1124 return;
1125
1126 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1127
1128
1129 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1130
1131
1132
1133
1134 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1135 goto put_bss;
1136
1137
1138 if (sdata->u.ibss.fixed_channel &&
1139 sdata->u.ibss.chandef.chan != cbss->channel)
1140 goto put_bss;
1141
1142
1143 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1144 memcmp(elems->ssid, sdata->u.ibss.ssid,
1145 sdata->u.ibss.ssid_len))
1146 goto put_bss;
1147
1148
1149 if (sdata->vif.csa_active ||
1150 ieee80211_ibss_process_chanswitch(sdata, elems, true))
1151 goto put_bss;
1152
1153
1154 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1155 goto put_bss;
1156
1157
1158 if (sdata->u.ibss.fixed_bssid)
1159 goto put_bss;
1160
1161 if (ieee80211_have_rx_timestamp(rx_status)) {
1162
1163 rx_timestamp =
1164 ieee80211_calculate_rx_timestamp(local, rx_status,
1165 len + FCS_LEN, 24);
1166 } else {
1167
1168
1169
1170
1171 rx_timestamp = drv_get_tsf(local, sdata);
1172 }
1173
1174 ibss_dbg(sdata,
1175 "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1176 mgmt->sa, mgmt->bssid,
1177 (unsigned long long)rx_timestamp,
1178 (unsigned long long)beacon_timestamp,
1179 (unsigned long long)(rx_timestamp - beacon_timestamp),
1180 jiffies);
1181
1182 if (beacon_timestamp > rx_timestamp) {
1183 ibss_dbg(sdata,
1184 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1185 mgmt->bssid);
1186 ieee80211_sta_join_ibss(sdata, bss);
1187 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1188 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1189 supp_rates);
1190 rcu_read_unlock();
1191 }
1192
1193 put_bss:
1194 ieee80211_rx_bss_put(local, bss);
1195}
1196
1197void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1198 const u8 *bssid, const u8 *addr,
1199 u32 supp_rates)
1200{
1201 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1202 struct ieee80211_local *local = sdata->local;
1203 struct sta_info *sta;
1204 struct ieee80211_chanctx_conf *chanctx_conf;
1205 struct ieee80211_supported_band *sband;
1206 enum nl80211_bss_scan_width scan_width;
1207 int band;
1208
1209
1210
1211
1212
1213 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1214 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1215 sdata->name, addr);
1216 return;
1217 }
1218
1219 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1220 return;
1221
1222 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1223 return;
1224
1225 rcu_read_lock();
1226 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1227 if (WARN_ON_ONCE(!chanctx_conf)) {
1228 rcu_read_unlock();
1229 return;
1230 }
1231 band = chanctx_conf->def.chan->band;
1232 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1233 rcu_read_unlock();
1234
1235 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1236 if (!sta)
1237 return;
1238
1239 sta->rx_stats.last_rx = jiffies;
1240
1241
1242 sband = local->hw.wiphy->bands[band];
1243 sta->sta.supp_rates[band] = supp_rates |
1244 ieee80211_mandatory_rates(sband, scan_width);
1245
1246 spin_lock(&ifibss->incomplete_lock);
1247 list_add(&sta->list, &ifibss->incomplete_stations);
1248 spin_unlock(&ifibss->incomplete_lock);
1249 ieee80211_queue_work(&local->hw, &sdata->work);
1250}
1251
1252static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1253{
1254 struct ieee80211_local *local = sdata->local;
1255 struct sta_info *sta, *tmp;
1256 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1257 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1258
1259 mutex_lock(&local->sta_mtx);
1260
1261 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1262 if (sdata != sta->sdata)
1263 continue;
1264
1265 if (time_after(jiffies, sta->rx_stats.last_rx + exp_time) ||
1266 (time_after(jiffies, sta->rx_stats.last_rx + exp_rsn) &&
1267 sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1268 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1269 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1270 "not authorized " : "", sta->sta.addr);
1271
1272 WARN_ON(__sta_info_destroy(sta));
1273 }
1274 }
1275
1276 mutex_unlock(&local->sta_mtx);
1277}
1278
1279
1280
1281
1282
1283static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1284{
1285 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1286 enum nl80211_bss_scan_width scan_width;
1287
1288 sdata_assert_lock(sdata);
1289
1290 mod_timer(&ifibss->timer,
1291 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1292
1293 ieee80211_ibss_sta_expire(sdata);
1294
1295 if (time_before(jiffies, ifibss->last_scan_completed +
1296 IEEE80211_IBSS_MERGE_INTERVAL))
1297 return;
1298
1299 if (ieee80211_sta_active_ibss(sdata))
1300 return;
1301
1302 if (ifibss->fixed_channel)
1303 return;
1304
1305 sdata_info(sdata,
1306 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1307
1308 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1309 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1310 NULL, 0, scan_width);
1311}
1312
1313static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1314{
1315 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1316 u8 bssid[ETH_ALEN];
1317 u16 capability;
1318 int i;
1319
1320 sdata_assert_lock(sdata);
1321
1322 if (ifibss->fixed_bssid) {
1323 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1324 } else {
1325
1326
1327
1328 get_random_bytes(bssid, ETH_ALEN);
1329 for (i = 0; i < ETH_ALEN; i++)
1330 bssid[i] ^= sdata->vif.addr[i];
1331 bssid[0] &= ~0x01;
1332 bssid[0] |= 0x02;
1333 }
1334
1335 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1336
1337 capability = WLAN_CAPABILITY_IBSS;
1338
1339 if (ifibss->privacy)
1340 capability |= WLAN_CAPABILITY_PRIVACY;
1341
1342 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1343 &ifibss->chandef, ifibss->basic_rates,
1344 capability, 0, true);
1345}
1346
1347static unsigned ibss_setup_channels(struct wiphy *wiphy,
1348 struct ieee80211_channel **channels,
1349 unsigned int channels_max,
1350 u32 center_freq, u32 width)
1351{
1352 struct ieee80211_channel *chan = NULL;
1353 unsigned int n_chan = 0;
1354 u32 start_freq, end_freq, freq;
1355
1356 if (width <= 20) {
1357 start_freq = center_freq;
1358 end_freq = center_freq;
1359 } else {
1360 start_freq = center_freq - width / 2 + 10;
1361 end_freq = center_freq + width / 2 - 10;
1362 }
1363
1364 for (freq = start_freq; freq <= end_freq; freq += 20) {
1365 chan = ieee80211_get_channel(wiphy, freq);
1366 if (!chan)
1367 continue;
1368 if (n_chan >= channels_max)
1369 return n_chan;
1370
1371 channels[n_chan] = chan;
1372 n_chan++;
1373 }
1374
1375 return n_chan;
1376}
1377
1378static unsigned int
1379ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1380 const struct cfg80211_chan_def *chandef,
1381 struct ieee80211_channel **channels,
1382 unsigned int channels_max)
1383{
1384 unsigned int n_chan = 0;
1385 u32 width, cf1, cf2 = 0;
1386
1387 switch (chandef->width) {
1388 case NL80211_CHAN_WIDTH_40:
1389 width = 40;
1390 break;
1391 case NL80211_CHAN_WIDTH_80P80:
1392 cf2 = chandef->center_freq2;
1393
1394 case NL80211_CHAN_WIDTH_80:
1395 width = 80;
1396 break;
1397 case NL80211_CHAN_WIDTH_160:
1398 width = 160;
1399 break;
1400 default:
1401 width = 20;
1402 break;
1403 }
1404
1405 cf1 = chandef->center_freq1;
1406
1407 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1408
1409 if (cf2)
1410 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1411 channels_max - n_chan, cf2,
1412 width);
1413
1414 return n_chan;
1415}
1416
1417
1418
1419
1420
1421static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1422{
1423 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1424 struct ieee80211_local *local = sdata->local;
1425 struct cfg80211_bss *cbss;
1426 struct ieee80211_channel *chan = NULL;
1427 const u8 *bssid = NULL;
1428 enum nl80211_bss_scan_width scan_width;
1429 int active_ibss;
1430
1431 sdata_assert_lock(sdata);
1432
1433 active_ibss = ieee80211_sta_active_ibss(sdata);
1434 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1435
1436 if (active_ibss)
1437 return;
1438
1439 if (ifibss->fixed_bssid)
1440 bssid = ifibss->bssid;
1441 if (ifibss->fixed_channel)
1442 chan = ifibss->chandef.chan;
1443 if (!is_zero_ether_addr(ifibss->bssid))
1444 bssid = ifibss->bssid;
1445 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1446 ifibss->ssid, ifibss->ssid_len,
1447 IEEE80211_BSS_TYPE_IBSS,
1448 IEEE80211_PRIVACY(ifibss->privacy));
1449
1450 if (cbss) {
1451 struct ieee80211_bss *bss;
1452
1453 bss = (void *)cbss->priv;
1454 ibss_dbg(sdata,
1455 "sta_find_ibss: selected %pM current %pM\n",
1456 cbss->bssid, ifibss->bssid);
1457 sdata_info(sdata,
1458 "Selected IBSS BSSID %pM based on configured SSID\n",
1459 cbss->bssid);
1460
1461 ieee80211_sta_join_ibss(sdata, bss);
1462 ieee80211_rx_bss_put(local, bss);
1463 return;
1464 }
1465
1466
1467
1468
1469 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1470 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1471 bssid);
1472 ieee80211_sta_create_ibss(sdata);
1473 return;
1474 }
1475
1476
1477 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1478
1479
1480 if (time_after(jiffies, ifibss->last_scan_completed +
1481 IEEE80211_SCAN_INTERVAL)) {
1482 struct ieee80211_channel *channels[8];
1483 unsigned int num;
1484
1485 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1486
1487 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1488
1489 if (ifibss->fixed_channel) {
1490 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1491 &ifibss->chandef,
1492 channels,
1493 ARRAY_SIZE(channels));
1494 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1495 ifibss->ssid_len, channels,
1496 num, scan_width);
1497 } else {
1498 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1499 ifibss->ssid_len, NULL,
1500 0, scan_width);
1501 }
1502 } else {
1503 int interval = IEEE80211_SCAN_INTERVAL;
1504
1505 if (time_after(jiffies, ifibss->ibss_join_req +
1506 IEEE80211_IBSS_JOIN_TIMEOUT))
1507 ieee80211_sta_create_ibss(sdata);
1508
1509 mod_timer(&ifibss->timer,
1510 round_jiffies(jiffies + interval));
1511 }
1512}
1513
1514static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1515 struct sk_buff *req)
1516{
1517 struct ieee80211_mgmt *mgmt = (void *)req->data;
1518 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1519 struct ieee80211_local *local = sdata->local;
1520 int tx_last_beacon, len = req->len;
1521 struct sk_buff *skb;
1522 struct beacon_data *presp;
1523 u8 *pos, *end;
1524
1525 sdata_assert_lock(sdata);
1526
1527 presp = rcu_dereference_protected(ifibss->presp,
1528 lockdep_is_held(&sdata->wdev.mtx));
1529
1530 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1531 len < 24 + 2 || !presp)
1532 return;
1533
1534 tx_last_beacon = drv_tx_last_beacon(local);
1535
1536 ibss_dbg(sdata,
1537 "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
1538 mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
1539
1540 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1541 return;
1542
1543 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1544 !is_broadcast_ether_addr(mgmt->bssid))
1545 return;
1546
1547 end = ((u8 *) mgmt) + len;
1548 pos = mgmt->u.probe_req.variable;
1549 if (pos[0] != WLAN_EID_SSID ||
1550 pos + 2 + pos[1] > end) {
1551 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1552 mgmt->sa);
1553 return;
1554 }
1555 if (pos[1] != 0 &&
1556 (pos[1] != ifibss->ssid_len ||
1557 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1558
1559 return;
1560 }
1561
1562
1563 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1564 if (!skb)
1565 return;
1566
1567 skb_reserve(skb, local->tx_headroom);
1568 memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
1569
1570 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1571 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1572 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1573
1574
1575 if (pos[1] == 0)
1576 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1577
1578 ieee80211_tx_skb(sdata, skb);
1579}
1580
1581static
1582void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1583 struct ieee80211_mgmt *mgmt, size_t len,
1584 struct ieee80211_rx_status *rx_status)
1585{
1586 size_t baselen;
1587 struct ieee802_11_elems elems;
1588
1589 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1590 offsetof(typeof(mgmt->u.beacon), variable));
1591
1592
1593
1594
1595
1596 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1597 if (baselen > len)
1598 return;
1599
1600 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1601 false, &elems);
1602
1603 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1604}
1605
1606void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1607 struct sk_buff *skb)
1608{
1609 struct ieee80211_rx_status *rx_status;
1610 struct ieee80211_mgmt *mgmt;
1611 u16 fc;
1612 struct ieee802_11_elems elems;
1613 int ies_len;
1614
1615 rx_status = IEEE80211_SKB_RXCB(skb);
1616 mgmt = (struct ieee80211_mgmt *) skb->data;
1617 fc = le16_to_cpu(mgmt->frame_control);
1618
1619 sdata_lock(sdata);
1620
1621 if (!sdata->u.ibss.ssid_len)
1622 goto mgmt_out;
1623
1624 switch (fc & IEEE80211_FCTL_STYPE) {
1625 case IEEE80211_STYPE_PROBE_REQ:
1626 ieee80211_rx_mgmt_probe_req(sdata, skb);
1627 break;
1628 case IEEE80211_STYPE_PROBE_RESP:
1629 case IEEE80211_STYPE_BEACON:
1630 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1631 rx_status);
1632 break;
1633 case IEEE80211_STYPE_AUTH:
1634 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1635 break;
1636 case IEEE80211_STYPE_DEAUTH:
1637 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1638 break;
1639 case IEEE80211_STYPE_ACTION:
1640 switch (mgmt->u.action.category) {
1641 case WLAN_CATEGORY_SPECTRUM_MGMT:
1642 ies_len = skb->len -
1643 offsetof(struct ieee80211_mgmt,
1644 u.action.u.chan_switch.variable);
1645
1646 if (ies_len < 0)
1647 break;
1648
1649 ieee802_11_parse_elems(
1650 mgmt->u.action.u.chan_switch.variable,
1651 ies_len, true, &elems);
1652
1653 if (elems.parse_error)
1654 break;
1655
1656 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1657 rx_status, &elems);
1658 break;
1659 }
1660 }
1661
1662 mgmt_out:
1663 sdata_unlock(sdata);
1664}
1665
1666void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1667{
1668 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1669 struct sta_info *sta;
1670
1671 sdata_lock(sdata);
1672
1673
1674
1675
1676
1677
1678 if (!ifibss->ssid_len)
1679 goto out;
1680
1681 spin_lock_bh(&ifibss->incomplete_lock);
1682 while (!list_empty(&ifibss->incomplete_stations)) {
1683 sta = list_first_entry(&ifibss->incomplete_stations,
1684 struct sta_info, list);
1685 list_del(&sta->list);
1686 spin_unlock_bh(&ifibss->incomplete_lock);
1687
1688 ieee80211_ibss_finish_sta(sta);
1689 rcu_read_unlock();
1690 spin_lock_bh(&ifibss->incomplete_lock);
1691 }
1692 spin_unlock_bh(&ifibss->incomplete_lock);
1693
1694 switch (ifibss->state) {
1695 case IEEE80211_IBSS_MLME_SEARCH:
1696 ieee80211_sta_find_ibss(sdata);
1697 break;
1698 case IEEE80211_IBSS_MLME_JOINED:
1699 ieee80211_sta_merge_ibss(sdata);
1700 break;
1701 default:
1702 WARN_ON(1);
1703 break;
1704 }
1705
1706 out:
1707 sdata_unlock(sdata);
1708}
1709
1710static void ieee80211_ibss_timer(unsigned long data)
1711{
1712 struct ieee80211_sub_if_data *sdata =
1713 (struct ieee80211_sub_if_data *) data;
1714
1715 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1716}
1717
1718void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1719{
1720 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1721
1722 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1723 (unsigned long) sdata);
1724 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1725 spin_lock_init(&ifibss->incomplete_lock);
1726 INIT_WORK(&ifibss->csa_connection_drop_work,
1727 ieee80211_csa_connection_drop_work);
1728}
1729
1730
1731void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1732{
1733 struct ieee80211_sub_if_data *sdata;
1734
1735 mutex_lock(&local->iflist_mtx);
1736 list_for_each_entry(sdata, &local->interfaces, list) {
1737 if (!ieee80211_sdata_running(sdata))
1738 continue;
1739 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1740 continue;
1741 sdata->u.ibss.last_scan_completed = jiffies;
1742 }
1743 mutex_unlock(&local->iflist_mtx);
1744}
1745
1746int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1747 struct cfg80211_ibss_params *params)
1748{
1749 u32 changed = 0;
1750 u32 rate_flags;
1751 struct ieee80211_supported_band *sband;
1752 enum ieee80211_chanctx_mode chanmode;
1753 struct ieee80211_local *local = sdata->local;
1754 int radar_detect_width = 0;
1755 int i;
1756 int ret;
1757
1758 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1759 ¶ms->chandef,
1760 sdata->wdev.iftype);
1761 if (ret < 0)
1762 return ret;
1763
1764 if (ret > 0) {
1765 if (!params->userspace_handles_dfs)
1766 return -EINVAL;
1767 radar_detect_width = BIT(params->chandef.width);
1768 }
1769
1770 chanmode = (params->channel_fixed && !ret) ?
1771 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1772
1773 mutex_lock(&local->chanctx_mtx);
1774 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode,
1775 radar_detect_width);
1776 mutex_unlock(&local->chanctx_mtx);
1777 if (ret < 0)
1778 return ret;
1779
1780 if (params->bssid) {
1781 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1782 sdata->u.ibss.fixed_bssid = true;
1783 } else
1784 sdata->u.ibss.fixed_bssid = false;
1785
1786 sdata->u.ibss.privacy = params->privacy;
1787 sdata->u.ibss.control_port = params->control_port;
1788 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1789 sdata->u.ibss.basic_rates = params->basic_rates;
1790 sdata->u.ibss.last_scan_completed = jiffies;
1791
1792
1793 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef);
1794 sband = local->hw.wiphy->bands[params->chandef.chan->band];
1795 for (i = 0; i < sband->n_bitrates; i++) {
1796 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1797 sdata->u.ibss.basic_rates &= ~BIT(i);
1798 }
1799 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1800 sizeof(params->mcast_rate));
1801
1802 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1803
1804 sdata->u.ibss.chandef = params->chandef;
1805 sdata->u.ibss.fixed_channel = params->channel_fixed;
1806
1807 if (params->ie) {
1808 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1809 GFP_KERNEL);
1810 if (sdata->u.ibss.ie)
1811 sdata->u.ibss.ie_len = params->ie_len;
1812 }
1813
1814 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1815 sdata->u.ibss.ibss_join_req = jiffies;
1816
1817 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1818 sdata->u.ibss.ssid_len = params->ssid_len;
1819
1820 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa,
1821 sizeof(sdata->u.ibss.ht_capa));
1822 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask,
1823 sizeof(sdata->u.ibss.ht_capa_mask));
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835 sdata->vif.bss_conf.ht_operation_mode |=
1836 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1837 | IEEE80211_HT_PARAM_RIFS_MODE;
1838
1839 changed |= BSS_CHANGED_HT;
1840 ieee80211_bss_info_change_notify(sdata, changed);
1841
1842 sdata->smps_mode = IEEE80211_SMPS_OFF;
1843 sdata->needed_rx_chains = local->rx_chains;
1844
1845 ieee80211_queue_work(&local->hw, &sdata->work);
1846
1847 return 0;
1848}
1849
1850int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1851{
1852 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1853
1854 ieee80211_ibss_disconnect(sdata);
1855 ifibss->ssid_len = 0;
1856 eth_zero_addr(ifibss->bssid);
1857
1858
1859 kfree(sdata->u.ibss.ie);
1860
1861
1862 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1863 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1864
1865 synchronize_rcu();
1866
1867 skb_queue_purge(&sdata->skb_queue);
1868
1869 del_timer_sync(&sdata->u.ibss.timer);
1870
1871 return 0;
1872}
1873
