1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * IBSS mode implementation
4 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
5 * Copyright 2004, Instant802 Networks, Inc.
6 * Copyright 2005, Devicescape Software, Inc.
7 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
8 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
9 * Copyright 2009, Johannes Berg <johannes@sipsolutions.net>
10 * Copyright 2013-2014 Intel Mobile Communications GmbH
11 * Copyright(c) 2016 Intel Deutschland GmbH
12 * Copyright(c) 2018-2021 Intel Corporation
13 */
14
15 #include <linux/delay.h>
16 #include <linux/slab.h>
17 #include <linux/if_ether.h>
18 #include <linux/skbuff.h>
19 #include <linux/if_arp.h>
20 #include <linux/etherdevice.h>
21 #include <linux/rtnetlink.h>
22 #include <net/mac80211.h>
23
24 #include "ieee80211_i.h"
25 #include "driver-ops.h"
26 #include "rate.h"
27
28 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
29 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
30
31 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
32 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
33 #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ)
34
35 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
36
37 static struct beacon_data *
ieee80211_ibss_build_presp(struct ieee80211_sub_if_data * sdata,const int beacon_int,const u32 basic_rates,const u16 capability,u64 tsf,struct cfg80211_chan_def * chandef,bool * have_higher_than_11mbit,struct cfg80211_csa_settings * csa_settings)38 ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata,
39 const int beacon_int, const u32 basic_rates,
40 const u16 capability, u64 tsf,
41 struct cfg80211_chan_def *chandef,
42 bool *have_higher_than_11mbit,
43 struct cfg80211_csa_settings *csa_settings)
44 {
45 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
46 struct ieee80211_local *local = sdata->local;
47 int rates_n = 0, i, ri;
48 struct ieee80211_mgmt *mgmt;
49 u8 *pos;
50 struct ieee80211_supported_band *sband;
51 u32 rate_flags, rates = 0, rates_added = 0;
52 struct beacon_data *presp;
53 int frame_len;
54 int shift;
55
56 /* Build IBSS probe response */
57 frame_len = sizeof(struct ieee80211_hdr_3addr) +
58 12 /* struct ieee80211_mgmt.u.beacon */ +
59 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
60 2 + 8 /* max Supported Rates */ +
61 3 /* max DS params */ +
62 4 /* IBSS params */ +
63 5 /* Channel Switch Announcement */ +
64 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
65 2 + sizeof(struct ieee80211_ht_cap) +
66 2 + sizeof(struct ieee80211_ht_operation) +
67 2 + sizeof(struct ieee80211_vht_cap) +
68 2 + sizeof(struct ieee80211_vht_operation) +
69 ifibss->ie_len;
70 presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
71 if (!presp)
72 return NULL;
73
74 presp->head = (void *)(presp + 1);
75
76 mgmt = (void *) presp->head;
77 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
78 IEEE80211_STYPE_PROBE_RESP);
79 eth_broadcast_addr(mgmt->da);
80 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
81 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
82 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
83 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
84 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
85
86 pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
87
88 *pos++ = WLAN_EID_SSID;
89 *pos++ = ifibss->ssid_len;
90 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
91 pos += ifibss->ssid_len;
92
93 sband = local->hw.wiphy->bands[chandef->chan->band];
94 rate_flags = ieee80211_chandef_rate_flags(chandef);
95 shift = ieee80211_chandef_get_shift(chandef);
96 rates_n = 0;
97 if (have_higher_than_11mbit)
98 *have_higher_than_11mbit = false;
99
100 for (i = 0; i < sband->n_bitrates; i++) {
101 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
102 continue;
103 if (sband->bitrates[i].bitrate > 110 &&
104 have_higher_than_11mbit)
105 *have_higher_than_11mbit = true;
106
107 rates |= BIT(i);
108 rates_n++;
109 }
110
111 *pos++ = WLAN_EID_SUPP_RATES;
112 *pos++ = min_t(int, 8, rates_n);
113 for (ri = 0; ri < sband->n_bitrates; ri++) {
114 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
115 5 * (1 << shift));
116 u8 basic = 0;
117 if (!(rates & BIT(ri)))
118 continue;
119
120 if (basic_rates & BIT(ri))
121 basic = 0x80;
122 *pos++ = basic | (u8) rate;
123 if (++rates_added == 8) {
124 ri++; /* continue at next rate for EXT_SUPP_RATES */
125 break;
126 }
127 }
128
129 if (sband->band == NL80211_BAND_2GHZ) {
130 *pos++ = WLAN_EID_DS_PARAMS;
131 *pos++ = 1;
132 *pos++ = ieee80211_frequency_to_channel(
133 chandef->chan->center_freq);
134 }
135
136 *pos++ = WLAN_EID_IBSS_PARAMS;
137 *pos++ = 2;
138 /* FIX: set ATIM window based on scan results */
139 *pos++ = 0;
140 *pos++ = 0;
141
142 if (csa_settings) {
143 *pos++ = WLAN_EID_CHANNEL_SWITCH;
144 *pos++ = 3;
145 *pos++ = csa_settings->block_tx ? 1 : 0;
146 *pos++ = ieee80211_frequency_to_channel(
147 csa_settings->chandef.chan->center_freq);
148 presp->cntdwn_counter_offsets[0] = (pos - presp->head);
149 *pos++ = csa_settings->count;
150 presp->cntdwn_current_counter = csa_settings->count;
151 }
152
153 /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
154 if (rates_n > 8) {
155 *pos++ = WLAN_EID_EXT_SUPP_RATES;
156 *pos++ = rates_n - 8;
157 for (; ri < sband->n_bitrates; ri++) {
158 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
159 5 * (1 << shift));
160 u8 basic = 0;
161 if (!(rates & BIT(ri)))
162 continue;
163
164 if (basic_rates & BIT(ri))
165 basic = 0x80;
166 *pos++ = basic | (u8) rate;
167 }
168 }
169
170 if (ifibss->ie_len) {
171 memcpy(pos, ifibss->ie, ifibss->ie_len);
172 pos += ifibss->ie_len;
173 }
174
175 /* add HT capability and information IEs */
176 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
177 chandef->width != NL80211_CHAN_WIDTH_5 &&
178 chandef->width != NL80211_CHAN_WIDTH_10 &&
179 sband->ht_cap.ht_supported) {
180 struct ieee80211_sta_ht_cap ht_cap;
181
182 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
183 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
184
185 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
186 /*
187 * Note: According to 802.11n-2009 9.13.3.1, HT Protection
188 * field and RIFS Mode are reserved in IBSS mode, therefore
189 * keep them at 0
190 */
191 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
192 chandef, 0, false);
193
194 /* add VHT capability and information IEs */
195 if (chandef->width != NL80211_CHAN_WIDTH_20 &&
196 chandef->width != NL80211_CHAN_WIDTH_40 &&
197 sband->vht_cap.vht_supported) {
198 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
199 sband->vht_cap.cap);
200 pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap,
201 chandef);
202 }
203 }
204
205 if (local->hw.queues >= IEEE80211_NUM_ACS)
206 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */
207
208 presp->head_len = pos - presp->head;
209 if (WARN_ON(presp->head_len > frame_len))
210 goto error;
211
212 return presp;
213 error:
214 kfree(presp);
215 return NULL;
216 }
217
__ieee80211_sta_join_ibss(struct ieee80211_sub_if_data * sdata,const u8 * bssid,const int beacon_int,struct cfg80211_chan_def * req_chandef,const u32 basic_rates,const u16 capability,u64 tsf,bool creator)218 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
219 const u8 *bssid, const int beacon_int,
220 struct cfg80211_chan_def *req_chandef,
221 const u32 basic_rates,
222 const u16 capability, u64 tsf,
223 bool creator)
224 {
225 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
226 struct ieee80211_local *local = sdata->local;
227 struct ieee80211_mgmt *mgmt;
228 struct cfg80211_bss *bss;
229 u32 bss_change;
230 struct cfg80211_chan_def chandef;
231 struct ieee80211_channel *chan;
232 struct beacon_data *presp;
233 struct cfg80211_inform_bss bss_meta = {};
234 bool have_higher_than_11mbit;
235 bool radar_required;
236 int err;
237
238 sdata_assert_lock(sdata);
239
240 /* Reset own TSF to allow time synchronization work. */
241 drv_reset_tsf(local, sdata);
242
243 if (!ether_addr_equal(ifibss->bssid, bssid))
244 sta_info_flush(sdata);
245
246 /* if merging, indicate to driver that we leave the old IBSS */
247 if (sdata->vif.bss_conf.ibss_joined) {
248 sdata->vif.bss_conf.ibss_joined = false;
249 sdata->vif.bss_conf.ibss_creator = false;
250 sdata->vif.bss_conf.enable_beacon = false;
251 netif_carrier_off(sdata->dev);
252 ieee80211_bss_info_change_notify(sdata,
253 BSS_CHANGED_IBSS |
254 BSS_CHANGED_BEACON_ENABLED);
255 drv_leave_ibss(local, sdata);
256 }
257
258 presp = rcu_dereference_protected(ifibss->presp,
259 lockdep_is_held(&sdata->wdev.mtx));
260 RCU_INIT_POINTER(ifibss->presp, NULL);
261 if (presp)
262 kfree_rcu(presp, rcu_head);
263
264 /* make a copy of the chandef, it could be modified below. */
265 chandef = *req_chandef;
266 chan = chandef.chan;
267 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
268 NL80211_IFTYPE_ADHOC)) {
269 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
270 chandef.width == NL80211_CHAN_WIDTH_10 ||
271 chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
272 chandef.width == NL80211_CHAN_WIDTH_20) {
273 sdata_info(sdata,
274 "Failed to join IBSS, beacons forbidden\n");
275 return;
276 }
277 chandef.width = NL80211_CHAN_WIDTH_20;
278 chandef.center_freq1 = chan->center_freq;
279 /* check again for downgraded chandef */
280 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
281 NL80211_IFTYPE_ADHOC)) {
282 sdata_info(sdata,
283 "Failed to join IBSS, beacons forbidden\n");
284 return;
285 }
286 }
287
288 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
289 &chandef, NL80211_IFTYPE_ADHOC);
290 if (err < 0) {
291 sdata_info(sdata,
292 "Failed to join IBSS, invalid chandef\n");
293 return;
294 }
295 if (err > 0 && !ifibss->userspace_handles_dfs) {
296 sdata_info(sdata,
297 "Failed to join IBSS, DFS channel without control program\n");
298 return;
299 }
300
301 radar_required = err;
302
303 mutex_lock(&local->mtx);
304 if (ieee80211_vif_use_channel(sdata, &chandef,
305 ifibss->fixed_channel ?
306 IEEE80211_CHANCTX_SHARED :
307 IEEE80211_CHANCTX_EXCLUSIVE)) {
308 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
309 mutex_unlock(&local->mtx);
310 return;
311 }
312 sdata->radar_required = radar_required;
313 mutex_unlock(&local->mtx);
314
315 memcpy(ifibss->bssid, bssid, ETH_ALEN);
316
317 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
318 capability, tsf, &chandef,
319 &have_higher_than_11mbit, NULL);
320 if (!presp)
321 return;
322
323 rcu_assign_pointer(ifibss->presp, presp);
324 mgmt = (void *)presp->head;
325
326 sdata->vif.bss_conf.enable_beacon = true;
327 sdata->vif.bss_conf.beacon_int = beacon_int;
328 sdata->vif.bss_conf.basic_rates = basic_rates;
329 sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
330 memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
331 bss_change = BSS_CHANGED_BEACON_INT;
332 bss_change |= ieee80211_reset_erp_info(sdata);
333 bss_change |= BSS_CHANGED_BSSID;
334 bss_change |= BSS_CHANGED_BEACON;
335 bss_change |= BSS_CHANGED_BEACON_ENABLED;
336 bss_change |= BSS_CHANGED_BASIC_RATES;
337 bss_change |= BSS_CHANGED_HT;
338 bss_change |= BSS_CHANGED_IBSS;
339 bss_change |= BSS_CHANGED_SSID;
340
341 /*
342 * In 5 GHz/802.11a, we can always use short slot time.
343 * (IEEE 802.11-2012 18.3.8.7)
344 *
345 * In 2.4GHz, we must always use long slots in IBSS for compatibility
346 * reasons.
347 * (IEEE 802.11-2012 19.4.5)
348 *
349 * HT follows these specifications (IEEE 802.11-2012 20.3.18)
350 */
351 sdata->vif.bss_conf.use_short_slot = chan->band == NL80211_BAND_5GHZ;
352 bss_change |= BSS_CHANGED_ERP_SLOT;
353
354 /* cf. IEEE 802.11 9.2.12 */
355 if (chan->band == NL80211_BAND_2GHZ && have_higher_than_11mbit)
356 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
357 else
358 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
359
360 ieee80211_set_wmm_default(sdata, true, false);
361
362 sdata->vif.bss_conf.ibss_joined = true;
363 sdata->vif.bss_conf.ibss_creator = creator;
364
365 err = drv_join_ibss(local, sdata);
366 if (err) {
367 sdata->vif.bss_conf.ibss_joined = false;
368 sdata->vif.bss_conf.ibss_creator = false;
369 sdata->vif.bss_conf.enable_beacon = false;
370 sdata->vif.bss_conf.ssid_len = 0;
371 RCU_INIT_POINTER(ifibss->presp, NULL);
372 kfree_rcu(presp, rcu_head);
373 mutex_lock(&local->mtx);
374 ieee80211_vif_release_channel(sdata);
375 mutex_unlock(&local->mtx);
376 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
377 err);
378 return;
379 }
380
381 ieee80211_bss_info_change_notify(sdata, bss_change);
382
383 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
384 mod_timer(&ifibss->timer,
385 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
386
387 bss_meta.chan = chan;
388 bss_meta.scan_width = cfg80211_chandef_to_scan_width(&chandef);
389 bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt,
390 presp->head_len, GFP_KERNEL);
391
392 cfg80211_put_bss(local->hw.wiphy, bss);
393 netif_carrier_on(sdata->dev);
394 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
395 }
396
ieee80211_sta_join_ibss(struct ieee80211_sub_if_data * sdata,struct ieee80211_bss * bss)397 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
398 struct ieee80211_bss *bss)
399 {
400 struct cfg80211_bss *cbss =
401 container_of((void *)bss, struct cfg80211_bss, priv);
402 struct ieee80211_supported_band *sband;
403 struct cfg80211_chan_def chandef;
404 u32 basic_rates;
405 int i, j;
406 u16 beacon_int = cbss->beacon_interval;
407 const struct cfg80211_bss_ies *ies;
408 enum nl80211_channel_type chan_type;
409 u64 tsf;
410 u32 rate_flags;
411 int shift;
412
413 sdata_assert_lock(sdata);
414
415 if (beacon_int < 10)
416 beacon_int = 10;
417
418 switch (sdata->u.ibss.chandef.width) {
419 case NL80211_CHAN_WIDTH_20_NOHT:
420 case NL80211_CHAN_WIDTH_20:
421 case NL80211_CHAN_WIDTH_40:
422 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
423 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
424 break;
425 case NL80211_CHAN_WIDTH_5:
426 case NL80211_CHAN_WIDTH_10:
427 cfg80211_chandef_create(&chandef, cbss->channel,
428 NL80211_CHAN_NO_HT);
429 chandef.width = sdata->u.ibss.chandef.width;
430 break;
431 case NL80211_CHAN_WIDTH_80:
432 case NL80211_CHAN_WIDTH_80P80:
433 case NL80211_CHAN_WIDTH_160:
434 chandef = sdata->u.ibss.chandef;
435 chandef.chan = cbss->channel;
436 break;
437 default:
438 /* fall back to 20 MHz for unsupported modes */
439 cfg80211_chandef_create(&chandef, cbss->channel,
440 NL80211_CHAN_NO_HT);
441 break;
442 }
443
444 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
445 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
446 shift = ieee80211_vif_get_shift(&sdata->vif);
447
448 basic_rates = 0;
449
450 for (i = 0; i < bss->supp_rates_len; i++) {
451 int rate = bss->supp_rates[i] & 0x7f;
452 bool is_basic = !!(bss->supp_rates[i] & 0x80);
453
454 for (j = 0; j < sband->n_bitrates; j++) {
455 int brate;
456 if ((rate_flags & sband->bitrates[j].flags)
457 != rate_flags)
458 continue;
459
460 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
461 5 * (1 << shift));
462 if (brate == rate) {
463 if (is_basic)
464 basic_rates |= BIT(j);
465 break;
466 }
467 }
468 }
469
470 rcu_read_lock();
471 ies = rcu_dereference(cbss->ies);
472 tsf = ies->tsf;
473 rcu_read_unlock();
474
475 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
476 beacon_int,
477 &chandef,
478 basic_rates,
479 cbss->capability,
480 tsf, false);
481 }
482
ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data * sdata,struct cfg80211_csa_settings * csa_settings)483 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
484 struct cfg80211_csa_settings *csa_settings)
485 {
486 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
487 struct beacon_data *presp, *old_presp;
488 struct cfg80211_bss *cbss;
489 const struct cfg80211_bss_ies *ies;
490 u16 capability = WLAN_CAPABILITY_IBSS;
491 u64 tsf;
492
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
ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data * sdata)530 int 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 /* When not connected/joined, sending CSA doesn't make sense. */
538 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED)
539 return -ENOLINK;
540
541 /* update cfg80211 bss information with the new channel */
542 if (!is_zero_ether_addr(ifibss->bssid)) {
543 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
544 ifibss->chandef.chan,
545 ifibss->bssid, ifibss->ssid,
546 ifibss->ssid_len,
547 IEEE80211_BSS_TYPE_IBSS,
548 IEEE80211_PRIVACY(ifibss->privacy));
549 /* XXX: should not really modify cfg80211 data */
550 if (cbss) {
551 cbss->channel = sdata->csa_chandef.chan;
552 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
553 }
554 }
555
556 ifibss->chandef = sdata->csa_chandef;
557
558 /* generate the beacon */
559 return ieee80211_ibss_csa_beacon(sdata, NULL);
560 }
561
ieee80211_ibss_stop(struct ieee80211_sub_if_data * sdata)562 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
563 {
564 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
565
566 cancel_work_sync(&ifibss->csa_connection_drop_work);
567 }
568
ieee80211_ibss_finish_sta(struct sta_info * sta)569 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
570 __acquires(RCU)
571 {
572 struct ieee80211_sub_if_data *sdata = sta->sdata;
573 u8 addr[ETH_ALEN];
574
575 memcpy(addr, sta->sta.addr, ETH_ALEN);
576
577 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
578
579 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
580 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
581 /* authorize the station only if the network is not RSN protected. If
582 * not wait for the userspace to authorize it */
583 if (!sta->sdata->u.ibss.control_port)
584 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
585
586 rate_control_rate_init(sta);
587
588 /* If it fails, maybe we raced another insertion? */
589 if (sta_info_insert_rcu(sta))
590 return sta_info_get(sdata, addr);
591 return sta;
592 }
593
594 static struct sta_info *
ieee80211_ibss_add_sta(struct ieee80211_sub_if_data * sdata,const u8 * bssid,const u8 * addr,u32 supp_rates)595 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
596 const u8 *addr, u32 supp_rates)
597 __acquires(RCU)
598 {
599 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
600 struct ieee80211_local *local = sdata->local;
601 struct sta_info *sta;
602 struct ieee80211_chanctx_conf *chanctx_conf;
603 struct ieee80211_supported_band *sband;
604 enum nl80211_bss_scan_width scan_width;
605 int band;
606
607 /*
608 * XXX: Consider removing the least recently used entry and
609 * allow new one to be added.
610 */
611 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
612 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
613 sdata->name, addr);
614 rcu_read_lock();
615 return NULL;
616 }
617
618 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
619 rcu_read_lock();
620 return NULL;
621 }
622
623 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
624 rcu_read_lock();
625 return NULL;
626 }
627
628 rcu_read_lock();
629 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
630 if (WARN_ON_ONCE(!chanctx_conf))
631 return NULL;
632 band = chanctx_conf->def.chan->band;
633 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
634 rcu_read_unlock();
635
636 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
637 if (!sta) {
638 rcu_read_lock();
639 return NULL;
640 }
641
642 /* make sure mandatory rates are always added */
643 sband = local->hw.wiphy->bands[band];
644 sta->sta.supp_rates[band] = supp_rates |
645 ieee80211_mandatory_rates(sband, scan_width);
646
647 return ieee80211_ibss_finish_sta(sta);
648 }
649
ieee80211_sta_active_ibss(struct ieee80211_sub_if_data * sdata)650 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
651 {
652 struct ieee80211_local *local = sdata->local;
653 int active = 0;
654 struct sta_info *sta;
655
656 sdata_assert_lock(sdata);
657
658 rcu_read_lock();
659
660 list_for_each_entry_rcu(sta, &local->sta_list, list) {
661 unsigned long last_active = ieee80211_sta_last_active(sta);
662
663 if (sta->sdata == sdata &&
664 time_is_after_jiffies(last_active +
665 IEEE80211_IBSS_MERGE_INTERVAL)) {
666 active++;
667 break;
668 }
669 }
670
671 rcu_read_unlock();
672
673 return active;
674 }
675
ieee80211_ibss_disconnect(struct ieee80211_sub_if_data * sdata)676 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
677 {
678 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
679 struct ieee80211_local *local = sdata->local;
680 struct cfg80211_bss *cbss;
681 struct beacon_data *presp;
682 struct sta_info *sta;
683
684 if (!is_zero_ether_addr(ifibss->bssid)) {
685 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
686 ifibss->bssid, ifibss->ssid,
687 ifibss->ssid_len,
688 IEEE80211_BSS_TYPE_IBSS,
689 IEEE80211_PRIVACY(ifibss->privacy));
690
691 if (cbss) {
692 cfg80211_unlink_bss(local->hw.wiphy, cbss);
693 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
694 }
695 }
696
697 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
698
699 sta_info_flush(sdata);
700
701 spin_lock_bh(&ifibss->incomplete_lock);
702 while (!list_empty(&ifibss->incomplete_stations)) {
703 sta = list_first_entry(&ifibss->incomplete_stations,
704 struct sta_info, list);
705 list_del(&sta->list);
706 spin_unlock_bh(&ifibss->incomplete_lock);
707
708 sta_info_free(local, sta);
709 spin_lock_bh(&ifibss->incomplete_lock);
710 }
711 spin_unlock_bh(&ifibss->incomplete_lock);
712
713 netif_carrier_off(sdata->dev);
714
715 sdata->vif.bss_conf.ibss_joined = false;
716 sdata->vif.bss_conf.ibss_creator = false;
717 sdata->vif.bss_conf.enable_beacon = false;
718 sdata->vif.bss_conf.ssid_len = 0;
719
720 /* remove beacon */
721 presp = rcu_dereference_protected(ifibss->presp,
722 lockdep_is_held(&sdata->wdev.mtx));
723 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
724 if (presp)
725 kfree_rcu(presp, rcu_head);
726
727 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
728 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
729 BSS_CHANGED_IBSS);
730 drv_leave_ibss(local, sdata);
731 mutex_lock(&local->mtx);
732 ieee80211_vif_release_channel(sdata);
733 mutex_unlock(&local->mtx);
734 }
735
ieee80211_csa_connection_drop_work(struct work_struct * work)736 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
737 {
738 struct ieee80211_sub_if_data *sdata =
739 container_of(work, struct ieee80211_sub_if_data,
740 u.ibss.csa_connection_drop_work);
741
742 sdata_lock(sdata);
743
744 ieee80211_ibss_disconnect(sdata);
745 synchronize_rcu();
746 skb_queue_purge(&sdata->skb_queue);
747
748 /* trigger a scan to find another IBSS network to join */
749 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
750
751 sdata_unlock(sdata);
752 }
753
ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data * sdata)754 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
755 {
756 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
757 int err;
758
759 /* if the current channel is a DFS channel, mark the channel as
760 * unavailable.
761 */
762 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
763 &ifibss->chandef,
764 NL80211_IFTYPE_ADHOC);
765 if (err > 0)
766 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
767 GFP_ATOMIC);
768 }
769
770 static bool
ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data * sdata,struct ieee802_11_elems * elems,bool beacon)771 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
772 struct ieee802_11_elems *elems,
773 bool beacon)
774 {
775 struct cfg80211_csa_settings params;
776 struct ieee80211_csa_ie csa_ie;
777 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
778 enum nl80211_channel_type ch_type;
779 int err;
780 u32 sta_flags;
781 u32 vht_cap_info = 0;
782
783 sdata_assert_lock(sdata);
784
785 sta_flags = IEEE80211_STA_DISABLE_VHT;
786 switch (ifibss->chandef.width) {
787 case NL80211_CHAN_WIDTH_5:
788 case NL80211_CHAN_WIDTH_10:
789 case NL80211_CHAN_WIDTH_20_NOHT:
790 sta_flags |= IEEE80211_STA_DISABLE_HT;
791 fallthrough;
792 case NL80211_CHAN_WIDTH_20:
793 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
794 break;
795 default:
796 break;
797 }
798
799 if (elems->vht_cap_elem)
800 vht_cap_info = le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
801
802 memset(¶ms, 0, sizeof(params));
803 err = ieee80211_parse_ch_switch_ie(sdata, elems,
804 ifibss->chandef.chan->band,
805 vht_cap_info,
806 sta_flags, ifibss->bssid, &csa_ie);
807 /* can't switch to destination channel, fail */
808 if (err < 0)
809 goto disconnect;
810
811 /* did not contain a CSA */
812 if (err)
813 return false;
814
815 /* channel switch is not supported, disconnect */
816 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
817 goto disconnect;
818
819 params.count = csa_ie.count;
820 params.chandef = csa_ie.chandef;
821
822 switch (ifibss->chandef.width) {
823 case NL80211_CHAN_WIDTH_20_NOHT:
824 case NL80211_CHAN_WIDTH_20:
825 case NL80211_CHAN_WIDTH_40:
826 /* keep our current HT mode (HT20/HT40+/HT40-), even if
827 * another mode has been announced. The mode is not adopted
828 * within the beacon while doing CSA and we should therefore
829 * keep the mode which we announce.
830 */
831 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
832 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan,
833 ch_type);
834 break;
835 case NL80211_CHAN_WIDTH_5:
836 case NL80211_CHAN_WIDTH_10:
837 if (params.chandef.width != ifibss->chandef.width) {
838 sdata_info(sdata,
839 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
840 ifibss->bssid,
841 params.chandef.chan->center_freq,
842 params.chandef.width,
843 params.chandef.center_freq1,
844 params.chandef.center_freq2);
845 goto disconnect;
846 }
847 break;
848 default:
849 /* should not happen, sta_flags should prevent VHT modes. */
850 WARN_ON(1);
851 goto disconnect;
852 }
853
854 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef,
855 NL80211_IFTYPE_ADHOC)) {
856 sdata_info(sdata,
857 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
858 ifibss->bssid,
859 params.chandef.chan->center_freq,
860 params.chandef.width,
861 params.chandef.center_freq1,
862 params.chandef.center_freq2);
863 goto disconnect;
864 }
865
866 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
867 ¶ms.chandef,
868 NL80211_IFTYPE_ADHOC);
869 if (err < 0)
870 goto disconnect;
871 if (err > 0 && !ifibss->userspace_handles_dfs) {
872 /* IBSS-DFS only allowed with a control program */
873 goto disconnect;
874 }
875
876 params.radar_required = err;
877
878 if (cfg80211_chandef_identical(¶ms.chandef,
879 &sdata->vif.bss_conf.chandef)) {
880 ibss_dbg(sdata,
881 "received csa with an identical chandef, ignoring\n");
882 return true;
883 }
884
885 /* all checks done, now perform the channel switch. */
886 ibss_dbg(sdata,
887 "received channel switch announcement to go to channel %d MHz\n",
888 params.chandef.chan->center_freq);
889
890 params.block_tx = !!csa_ie.mode;
891
892 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
893 ¶ms))
894 goto disconnect;
895
896 ieee80211_ibss_csa_mark_radar(sdata);
897
898 return true;
899 disconnect:
900 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
901 ieee80211_queue_work(&sdata->local->hw,
902 &ifibss->csa_connection_drop_work);
903
904 ieee80211_ibss_csa_mark_radar(sdata);
905
906 return true;
907 }
908
909 static void
ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len,struct ieee80211_rx_status * rx_status,struct ieee802_11_elems * elems)910 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
911 struct ieee80211_mgmt *mgmt, size_t len,
912 struct ieee80211_rx_status *rx_status,
913 struct ieee802_11_elems *elems)
914 {
915 int required_len;
916
917 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
918 return;
919
920 /* CSA is the only action we handle for now */
921 if (mgmt->u.action.u.measurement.action_code !=
922 WLAN_ACTION_SPCT_CHL_SWITCH)
923 return;
924
925 required_len = IEEE80211_MIN_ACTION_SIZE +
926 sizeof(mgmt->u.action.u.chan_switch);
927 if (len < required_len)
928 return;
929
930 if (!sdata->vif.csa_active)
931 ieee80211_ibss_process_chanswitch(sdata, elems, false);
932 }
933
ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)934 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
935 struct ieee80211_mgmt *mgmt,
936 size_t len)
937 {
938 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
939
940 if (len < IEEE80211_DEAUTH_FRAME_LEN)
941 return;
942
943 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
944 ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason);
945 sta_info_destroy_addr(sdata, mgmt->sa);
946 }
947
ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)948 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
949 struct ieee80211_mgmt *mgmt,
950 size_t len)
951 {
952 u16 auth_alg, auth_transaction;
953
954 sdata_assert_lock(sdata);
955
956 if (len < 24 + 6)
957 return;
958
959 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
960 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
961
962 ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
963 ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n",
964 mgmt->bssid, auth_transaction);
965
966 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
967 return;
968
969 /*
970 * IEEE 802.11 standard does not require authentication in IBSS
971 * networks and most implementations do not seem to use it.
972 * However, try to reply to authentication attempts if someone
973 * has actually implemented this.
974 */
975 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
976 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
977 }
978
ieee80211_update_sta_info(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len,struct ieee80211_rx_status * rx_status,struct ieee802_11_elems * elems,struct ieee80211_channel * channel)979 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
980 struct ieee80211_mgmt *mgmt, size_t len,
981 struct ieee80211_rx_status *rx_status,
982 struct ieee802_11_elems *elems,
983 struct ieee80211_channel *channel)
984 {
985 struct sta_info *sta;
986 enum nl80211_band band = rx_status->band;
987 enum nl80211_bss_scan_width scan_width;
988 struct ieee80211_local *local = sdata->local;
989 struct ieee80211_supported_band *sband;
990 bool rates_updated = false;
991 u32 supp_rates = 0;
992
993 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
994 return;
995
996 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
997 return;
998
999 sband = local->hw.wiphy->bands[band];
1000 if (WARN_ON(!sband))
1001 return;
1002
1003 rcu_read_lock();
1004 sta = sta_info_get(sdata, mgmt->sa);
1005
1006 if (elems->supp_rates) {
1007 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1008 band, NULL);
1009 if (sta) {
1010 u32 prev_rates;
1011
1012 prev_rates = sta->sta.supp_rates[band];
1013 /* make sure mandatory rates are always added */
1014 scan_width = NL80211_BSS_CHAN_WIDTH_20;
1015 if (rx_status->bw == RATE_INFO_BW_5)
1016 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1017 else if (rx_status->bw == RATE_INFO_BW_10)
1018 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1019
1020 sta->sta.supp_rates[band] = supp_rates |
1021 ieee80211_mandatory_rates(sband, scan_width);
1022 if (sta->sta.supp_rates[band] != prev_rates) {
1023 ibss_dbg(sdata,
1024 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1025 sta->sta.addr, prev_rates,
1026 sta->sta.supp_rates[band]);
1027 rates_updated = true;
1028 }
1029 } else {
1030 rcu_read_unlock();
1031 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1032 mgmt->sa, supp_rates);
1033 }
1034 }
1035
1036 if (sta && !sta->sta.wme &&
1037 (elems->wmm_info || elems->s1g_capab) &&
1038 local->hw.queues >= IEEE80211_NUM_ACS) {
1039 sta->sta.wme = true;
1040 ieee80211_check_fast_xmit(sta);
1041 }
1042
1043 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1044 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1045 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1046 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1047 /* we both use HT */
1048 struct ieee80211_ht_cap htcap_ie;
1049 struct cfg80211_chan_def chandef;
1050 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
1051
1052 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT);
1053 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef);
1054
1055 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1056 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1057 &htcap_ie,
1058 sta);
1059
1060 if (elems->vht_operation && elems->vht_cap_elem &&
1061 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1062 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1063 /* we both use VHT */
1064 struct ieee80211_vht_cap cap_ie;
1065 struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap;
1066 u32 vht_cap_info =
1067 le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
1068
1069 ieee80211_chandef_vht_oper(&local->hw, vht_cap_info,
1070 elems->vht_operation,
1071 elems->ht_operation,
1072 &chandef);
1073 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1074 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1075 &cap_ie, sta);
1076 if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap)))
1077 rates_updated |= true;
1078 }
1079
1080 if (bw != sta->sta.bandwidth)
1081 rates_updated |= true;
1082
1083 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1084 &chandef))
1085 WARN_ON_ONCE(1);
1086 }
1087
1088 if (sta && rates_updated) {
1089 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1090 u8 rx_nss = sta->sta.rx_nss;
1091
1092 /* Force rx_nss recalculation */
1093 sta->sta.rx_nss = 0;
1094 rate_control_rate_init(sta);
1095 if (sta->sta.rx_nss != rx_nss)
1096 changed |= IEEE80211_RC_NSS_CHANGED;
1097
1098 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1099 }
1100
1101 rcu_read_unlock();
1102 }
1103
ieee80211_rx_bss_info(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len,struct ieee80211_rx_status * rx_status,struct ieee802_11_elems * elems)1104 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1105 struct ieee80211_mgmt *mgmt, size_t len,
1106 struct ieee80211_rx_status *rx_status,
1107 struct ieee802_11_elems *elems)
1108 {
1109 struct ieee80211_local *local = sdata->local;
1110 struct cfg80211_bss *cbss;
1111 struct ieee80211_bss *bss;
1112 struct ieee80211_channel *channel;
1113 u64 beacon_timestamp, rx_timestamp;
1114 u32 supp_rates = 0;
1115 enum nl80211_band band = rx_status->band;
1116
1117 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1118 if (!channel)
1119 return;
1120
1121 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1122
1123 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel);
1124 if (!bss)
1125 return;
1126
1127 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1128
1129 /* same for beacon and probe response */
1130 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1131
1132 /* check if we need to merge IBSS */
1133
1134 /* not an IBSS */
1135 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1136 goto put_bss;
1137
1138 /* different channel */
1139 if (sdata->u.ibss.fixed_channel &&
1140 sdata->u.ibss.chandef.chan != cbss->channel)
1141 goto put_bss;
1142
1143 /* different SSID */
1144 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1145 memcmp(elems->ssid, sdata->u.ibss.ssid,
1146 sdata->u.ibss.ssid_len))
1147 goto put_bss;
1148
1149 /* process channel switch */
1150 if (sdata->vif.csa_active ||
1151 ieee80211_ibss_process_chanswitch(sdata, elems, true))
1152 goto put_bss;
1153
1154 /* same BSSID */
1155 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1156 goto put_bss;
1157
1158 /* we use a fixed BSSID */
1159 if (sdata->u.ibss.fixed_bssid)
1160 goto put_bss;
1161
1162 if (ieee80211_have_rx_timestamp(rx_status)) {
1163 /* time when timestamp field was received */
1164 rx_timestamp =
1165 ieee80211_calculate_rx_timestamp(local, rx_status,
1166 len + FCS_LEN, 24);
1167 } else {
1168 /*
1169 * second best option: get current TSF
1170 * (will return -1 if not supported)
1171 */
1172 rx_timestamp = drv_get_tsf(local, sdata);
1173 }
1174
1175 ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n",
1176 mgmt->sa, mgmt->bssid,
1177 (unsigned long long)rx_timestamp);
1178 ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n",
1179 (unsigned long long)beacon_timestamp,
1180 (unsigned long long)(rx_timestamp - beacon_timestamp),
1181 jiffies);
1182
1183 if (beacon_timestamp > rx_timestamp) {
1184 ibss_dbg(sdata,
1185 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1186 mgmt->bssid);
1187 ieee80211_sta_join_ibss(sdata, bss);
1188 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1189 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1190 supp_rates);
1191 rcu_read_unlock();
1192 }
1193
1194 put_bss:
1195 ieee80211_rx_bss_put(local, bss);
1196 }
1197
ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data * sdata,const u8 * bssid,const u8 * addr,u32 supp_rates)1198 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1199 const u8 *bssid, const u8 *addr,
1200 u32 supp_rates)
1201 {
1202 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1203 struct ieee80211_local *local = sdata->local;
1204 struct sta_info *sta;
1205 struct ieee80211_chanctx_conf *chanctx_conf;
1206 struct ieee80211_supported_band *sband;
1207 enum nl80211_bss_scan_width scan_width;
1208 int band;
1209
1210 /*
1211 * XXX: Consider removing the least recently used entry and
1212 * allow new one to be added.
1213 */
1214 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1215 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1216 sdata->name, addr);
1217 return;
1218 }
1219
1220 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1221 return;
1222
1223 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1224 return;
1225
1226 rcu_read_lock();
1227 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1228 if (WARN_ON_ONCE(!chanctx_conf)) {
1229 rcu_read_unlock();
1230 return;
1231 }
1232 band = chanctx_conf->def.chan->band;
1233 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1234 rcu_read_unlock();
1235
1236 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1237 if (!sta)
1238 return;
1239
1240 /* make sure mandatory rates are always added */
1241 sband = local->hw.wiphy->bands[band];
1242 sta->sta.supp_rates[band] = supp_rates |
1243 ieee80211_mandatory_rates(sband, scan_width);
1244
1245 spin_lock(&ifibss->incomplete_lock);
1246 list_add(&sta->list, &ifibss->incomplete_stations);
1247 spin_unlock(&ifibss->incomplete_lock);
1248 ieee80211_queue_work(&local->hw, &sdata->work);
1249 }
1250
ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data * sdata)1251 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1252 {
1253 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
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 unsigned long last_active = ieee80211_sta_last_active(sta);
1263
1264 if (sdata != sta->sdata)
1265 continue;
1266
1267 if (time_is_before_jiffies(last_active + exp_time) ||
1268 (time_is_before_jiffies(last_active + exp_rsn) &&
1269 sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1270 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
1271
1272 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1273 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1274 "not authorized " : "", sta->sta.addr);
1275
1276 ieee80211_send_deauth_disassoc(sdata, sta->sta.addr,
1277 ifibss->bssid,
1278 IEEE80211_STYPE_DEAUTH,
1279 WLAN_REASON_DEAUTH_LEAVING,
1280 true, frame_buf);
1281 WARN_ON(__sta_info_destroy(sta));
1282 }
1283 }
1284
1285 mutex_unlock(&local->sta_mtx);
1286 }
1287
1288 /*
1289 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1290 */
1291
ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data * sdata)1292 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1293 {
1294 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1295 enum nl80211_bss_scan_width scan_width;
1296
1297 sdata_assert_lock(sdata);
1298
1299 mod_timer(&ifibss->timer,
1300 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1301
1302 ieee80211_ibss_sta_expire(sdata);
1303
1304 if (time_before(jiffies, ifibss->last_scan_completed +
1305 IEEE80211_IBSS_MERGE_INTERVAL))
1306 return;
1307
1308 if (ieee80211_sta_active_ibss(sdata))
1309 return;
1310
1311 if (ifibss->fixed_channel)
1312 return;
1313
1314 sdata_info(sdata,
1315 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1316
1317 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1318 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1319 NULL, 0, scan_width);
1320 }
1321
ieee80211_sta_create_ibss(struct ieee80211_sub_if_data * sdata)1322 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1323 {
1324 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1325 u8 bssid[ETH_ALEN];
1326 u16 capability;
1327 int i;
1328
1329 sdata_assert_lock(sdata);
1330
1331 if (ifibss->fixed_bssid) {
1332 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1333 } else {
1334 /* Generate random, not broadcast, locally administered BSSID. Mix in
1335 * own MAC address to make sure that devices that do not have proper
1336 * random number generator get different BSSID. */
1337 get_random_bytes(bssid, ETH_ALEN);
1338 for (i = 0; i < ETH_ALEN; i++)
1339 bssid[i] ^= sdata->vif.addr[i];
1340 bssid[0] &= ~0x01;
1341 bssid[0] |= 0x02;
1342 }
1343
1344 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1345
1346 capability = WLAN_CAPABILITY_IBSS;
1347
1348 if (ifibss->privacy)
1349 capability |= WLAN_CAPABILITY_PRIVACY;
1350
1351 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1352 &ifibss->chandef, ifibss->basic_rates,
1353 capability, 0, true);
1354 }
1355
ibss_setup_channels(struct wiphy * wiphy,struct ieee80211_channel ** channels,unsigned int channels_max,u32 center_freq,u32 width)1356 static unsigned ibss_setup_channels(struct wiphy *wiphy,
1357 struct ieee80211_channel **channels,
1358 unsigned int channels_max,
1359 u32 center_freq, u32 width)
1360 {
1361 struct ieee80211_channel *chan = NULL;
1362 unsigned int n_chan = 0;
1363 u32 start_freq, end_freq, freq;
1364
1365 if (width <= 20) {
1366 start_freq = center_freq;
1367 end_freq = center_freq;
1368 } else {
1369 start_freq = center_freq - width / 2 + 10;
1370 end_freq = center_freq + width / 2 - 10;
1371 }
1372
1373 for (freq = start_freq; freq <= end_freq; freq += 20) {
1374 chan = ieee80211_get_channel(wiphy, freq);
1375 if (!chan)
1376 continue;
1377 if (n_chan >= channels_max)
1378 return n_chan;
1379
1380 channels[n_chan] = chan;
1381 n_chan++;
1382 }
1383
1384 return n_chan;
1385 }
1386
1387 static unsigned int
ieee80211_ibss_setup_scan_channels(struct wiphy * wiphy,const struct cfg80211_chan_def * chandef,struct ieee80211_channel ** channels,unsigned int channels_max)1388 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1389 const struct cfg80211_chan_def *chandef,
1390 struct ieee80211_channel **channels,
1391 unsigned int channels_max)
1392 {
1393 unsigned int n_chan = 0;
1394 u32 width, cf1, cf2 = 0;
1395
1396 switch (chandef->width) {
1397 case NL80211_CHAN_WIDTH_40:
1398 width = 40;
1399 break;
1400 case NL80211_CHAN_WIDTH_80P80:
1401 cf2 = chandef->center_freq2;
1402 fallthrough;
1403 case NL80211_CHAN_WIDTH_80:
1404 width = 80;
1405 break;
1406 case NL80211_CHAN_WIDTH_160:
1407 width = 160;
1408 break;
1409 default:
1410 width = 20;
1411 break;
1412 }
1413
1414 cf1 = chandef->center_freq1;
1415
1416 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1417
1418 if (cf2)
1419 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1420 channels_max - n_chan, cf2,
1421 width);
1422
1423 return n_chan;
1424 }
1425
1426 /*
1427 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1428 */
1429
ieee80211_sta_find_ibss(struct ieee80211_sub_if_data * sdata)1430 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1431 {
1432 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1433 struct ieee80211_local *local = sdata->local;
1434 struct cfg80211_bss *cbss;
1435 struct ieee80211_channel *chan = NULL;
1436 const u8 *bssid = NULL;
1437 enum nl80211_bss_scan_width scan_width;
1438 int active_ibss;
1439
1440 sdata_assert_lock(sdata);
1441
1442 active_ibss = ieee80211_sta_active_ibss(sdata);
1443 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1444
1445 if (active_ibss)
1446 return;
1447
1448 if (ifibss->fixed_bssid)
1449 bssid = ifibss->bssid;
1450 if (ifibss->fixed_channel)
1451 chan = ifibss->chandef.chan;
1452 if (!is_zero_ether_addr(ifibss->bssid))
1453 bssid = ifibss->bssid;
1454 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1455 ifibss->ssid, ifibss->ssid_len,
1456 IEEE80211_BSS_TYPE_IBSS,
1457 IEEE80211_PRIVACY(ifibss->privacy));
1458
1459 if (cbss) {
1460 struct ieee80211_bss *bss;
1461
1462 bss = (void *)cbss->priv;
1463 ibss_dbg(sdata,
1464 "sta_find_ibss: selected %pM current %pM\n",
1465 cbss->bssid, ifibss->bssid);
1466 sdata_info(sdata,
1467 "Selected IBSS BSSID %pM based on configured SSID\n",
1468 cbss->bssid);
1469
1470 ieee80211_sta_join_ibss(sdata, bss);
1471 ieee80211_rx_bss_put(local, bss);
1472 return;
1473 }
1474
1475 /* if a fixed bssid and a fixed freq have been provided create the IBSS
1476 * directly and do not waste time scanning
1477 */
1478 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1479 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1480 bssid);
1481 ieee80211_sta_create_ibss(sdata);
1482 return;
1483 }
1484
1485
1486 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1487
1488 /* Selected IBSS not found in current scan results - try to scan */
1489 if (time_after(jiffies, ifibss->last_scan_completed +
1490 IEEE80211_SCAN_INTERVAL)) {
1491 struct ieee80211_channel *channels[8];
1492 unsigned int num;
1493
1494 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1495
1496 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1497
1498 if (ifibss->fixed_channel) {
1499 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1500 &ifibss->chandef,
1501 channels,
1502 ARRAY_SIZE(channels));
1503 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1504 ifibss->ssid_len, channels,
1505 num, scan_width);
1506 } else {
1507 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1508 ifibss->ssid_len, NULL,
1509 0, scan_width);
1510 }
1511 } else {
1512 int interval = IEEE80211_SCAN_INTERVAL;
1513
1514 if (time_after(jiffies, ifibss->ibss_join_req +
1515 IEEE80211_IBSS_JOIN_TIMEOUT))
1516 ieee80211_sta_create_ibss(sdata);
1517
1518 mod_timer(&ifibss->timer,
1519 round_jiffies(jiffies + interval));
1520 }
1521 }
1522
ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data * sdata,struct sk_buff * req)1523 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1524 struct sk_buff *req)
1525 {
1526 struct ieee80211_mgmt *mgmt = (void *)req->data;
1527 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1528 struct ieee80211_local *local = sdata->local;
1529 int tx_last_beacon, len = req->len;
1530 struct sk_buff *skb;
1531 struct beacon_data *presp;
1532 u8 *pos, *end;
1533
1534 sdata_assert_lock(sdata);
1535
1536 presp = rcu_dereference_protected(ifibss->presp,
1537 lockdep_is_held(&sdata->wdev.mtx));
1538
1539 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1540 len < 24 + 2 || !presp)
1541 return;
1542
1543 tx_last_beacon = drv_tx_last_beacon(local);
1544
1545 ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
1546 ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n",
1547 mgmt->bssid, tx_last_beacon);
1548
1549 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1550 return;
1551
1552 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1553 !is_broadcast_ether_addr(mgmt->bssid))
1554 return;
1555
1556 end = ((u8 *) mgmt) + len;
1557 pos = mgmt->u.probe_req.variable;
1558 if (pos[0] != WLAN_EID_SSID ||
1559 pos + 2 + pos[1] > end) {
1560 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1561 mgmt->sa);
1562 return;
1563 }
1564 if (pos[1] != 0 &&
1565 (pos[1] != ifibss->ssid_len ||
1566 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1567 /* Ignore ProbeReq for foreign SSID */
1568 return;
1569 }
1570
1571 /* Reply with ProbeResp */
1572 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1573 if (!skb)
1574 return;
1575
1576 skb_reserve(skb, local->tx_headroom);
1577 skb_put_data(skb, presp->head, presp->head_len);
1578
1579 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1580 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1581 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1582
1583 /* avoid excessive retries for probe request to wildcard SSIDs */
1584 if (pos[1] == 0)
1585 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1586
1587 ieee80211_tx_skb(sdata, skb);
1588 }
1589
1590 static
ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len,struct ieee80211_rx_status * rx_status)1591 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1592 struct ieee80211_mgmt *mgmt, size_t len,
1593 struct ieee80211_rx_status *rx_status)
1594 {
1595 size_t baselen;
1596 struct ieee802_11_elems *elems;
1597
1598 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1599 offsetof(typeof(mgmt->u.beacon), variable));
1600
1601 /*
1602 * either beacon or probe_resp but the variable field is at the
1603 * same offset
1604 */
1605 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1606 if (baselen > len)
1607 return;
1608
1609 elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable,
1610 len - baselen, false,
1611 mgmt->bssid, NULL);
1612
1613 if (elems) {
1614 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, elems);
1615 kfree(elems);
1616 }
1617 }
1618
ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1619 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1620 struct sk_buff *skb)
1621 {
1622 struct ieee80211_rx_status *rx_status;
1623 struct ieee80211_mgmt *mgmt;
1624 u16 fc;
1625 struct ieee802_11_elems *elems;
1626 int ies_len;
1627
1628 rx_status = IEEE80211_SKB_RXCB(skb);
1629 mgmt = (struct ieee80211_mgmt *) skb->data;
1630 fc = le16_to_cpu(mgmt->frame_control);
1631
1632 sdata_lock(sdata);
1633
1634 if (!sdata->u.ibss.ssid_len)
1635 goto mgmt_out; /* not ready to merge yet */
1636
1637 switch (fc & IEEE80211_FCTL_STYPE) {
1638 case IEEE80211_STYPE_PROBE_REQ:
1639 ieee80211_rx_mgmt_probe_req(sdata, skb);
1640 break;
1641 case IEEE80211_STYPE_PROBE_RESP:
1642 case IEEE80211_STYPE_BEACON:
1643 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1644 rx_status);
1645 break;
1646 case IEEE80211_STYPE_AUTH:
1647 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1648 break;
1649 case IEEE80211_STYPE_DEAUTH:
1650 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1651 break;
1652 case IEEE80211_STYPE_ACTION:
1653 switch (mgmt->u.action.category) {
1654 case WLAN_CATEGORY_SPECTRUM_MGMT:
1655 ies_len = skb->len -
1656 offsetof(struct ieee80211_mgmt,
1657 u.action.u.chan_switch.variable);
1658
1659 if (ies_len < 0)
1660 break;
1661
1662 elems = ieee802_11_parse_elems(
1663 mgmt->u.action.u.chan_switch.variable,
1664 ies_len, true, mgmt->bssid, NULL);
1665
1666 if (elems && !elems->parse_error)
1667 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt,
1668 skb->len,
1669 rx_status,
1670 elems);
1671 kfree(elems);
1672 break;
1673 }
1674 }
1675
1676 mgmt_out:
1677 sdata_unlock(sdata);
1678 }
1679
ieee80211_ibss_work(struct ieee80211_sub_if_data * sdata)1680 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1681 {
1682 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1683 struct sta_info *sta;
1684
1685 sdata_lock(sdata);
1686
1687 /*
1688 * Work could be scheduled after scan or similar
1689 * when we aren't even joined (or trying) with a
1690 * network.
1691 */
1692 if (!ifibss->ssid_len)
1693 goto out;
1694
1695 spin_lock_bh(&ifibss->incomplete_lock);
1696 while (!list_empty(&ifibss->incomplete_stations)) {
1697 sta = list_first_entry(&ifibss->incomplete_stations,
1698 struct sta_info, list);
1699 list_del(&sta->list);
1700 spin_unlock_bh(&ifibss->incomplete_lock);
1701
1702 ieee80211_ibss_finish_sta(sta);
1703 rcu_read_unlock();
1704 spin_lock_bh(&ifibss->incomplete_lock);
1705 }
1706 spin_unlock_bh(&ifibss->incomplete_lock);
1707
1708 switch (ifibss->state) {
1709 case IEEE80211_IBSS_MLME_SEARCH:
1710 ieee80211_sta_find_ibss(sdata);
1711 break;
1712 case IEEE80211_IBSS_MLME_JOINED:
1713 ieee80211_sta_merge_ibss(sdata);
1714 break;
1715 default:
1716 WARN_ON(1);
1717 break;
1718 }
1719
1720 out:
1721 sdata_unlock(sdata);
1722 }
1723
ieee80211_ibss_timer(struct timer_list * t)1724 static void ieee80211_ibss_timer(struct timer_list *t)
1725 {
1726 struct ieee80211_sub_if_data *sdata =
1727 from_timer(sdata, t, u.ibss.timer);
1728
1729 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1730 }
1731
ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data * sdata)1732 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1733 {
1734 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1735
1736 timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0);
1737 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1738 spin_lock_init(&ifibss->incomplete_lock);
1739 INIT_WORK(&ifibss->csa_connection_drop_work,
1740 ieee80211_csa_connection_drop_work);
1741 }
1742
1743 /* scan finished notification */
ieee80211_ibss_notify_scan_completed(struct ieee80211_local * local)1744 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1745 {
1746 struct ieee80211_sub_if_data *sdata;
1747
1748 mutex_lock(&local->iflist_mtx);
1749 list_for_each_entry(sdata, &local->interfaces, list) {
1750 if (!ieee80211_sdata_running(sdata))
1751 continue;
1752 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1753 continue;
1754 sdata->u.ibss.last_scan_completed = jiffies;
1755 }
1756 mutex_unlock(&local->iflist_mtx);
1757 }
1758
ieee80211_ibss_join(struct ieee80211_sub_if_data * sdata,struct cfg80211_ibss_params * params)1759 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1760 struct cfg80211_ibss_params *params)
1761 {
1762 u32 changed = 0;
1763 u32 rate_flags;
1764 struct ieee80211_supported_band *sband;
1765 enum ieee80211_chanctx_mode chanmode;
1766 struct ieee80211_local *local = sdata->local;
1767 int radar_detect_width = 0;
1768 int i;
1769 int ret;
1770
1771 if (params->chandef.chan->freq_offset) {
1772 /* this may work, but is untested */
1773 return -EOPNOTSUPP;
1774 }
1775
1776 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1777 ¶ms->chandef,
1778 sdata->wdev.iftype);
1779 if (ret < 0)
1780 return ret;
1781
1782 if (ret > 0) {
1783 if (!params->userspace_handles_dfs)
1784 return -EINVAL;
1785 radar_detect_width = BIT(params->chandef.width);
1786 }
1787
1788 chanmode = (params->channel_fixed && !ret) ?
1789 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1790
1791 mutex_lock(&local->chanctx_mtx);
1792 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode,
1793 radar_detect_width);
1794 mutex_unlock(&local->chanctx_mtx);
1795 if (ret < 0)
1796 return ret;
1797
1798 if (params->bssid) {
1799 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1800 sdata->u.ibss.fixed_bssid = true;
1801 } else
1802 sdata->u.ibss.fixed_bssid = false;
1803
1804 sdata->u.ibss.privacy = params->privacy;
1805 sdata->u.ibss.control_port = params->control_port;
1806 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1807 sdata->u.ibss.basic_rates = params->basic_rates;
1808 sdata->u.ibss.last_scan_completed = jiffies;
1809
1810 /* fix basic_rates if channel does not support these rates */
1811 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef);
1812 sband = local->hw.wiphy->bands[params->chandef.chan->band];
1813 for (i = 0; i < sband->n_bitrates; i++) {
1814 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1815 sdata->u.ibss.basic_rates &= ~BIT(i);
1816 }
1817 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1818 sizeof(params->mcast_rate));
1819
1820 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1821
1822 sdata->u.ibss.chandef = params->chandef;
1823 sdata->u.ibss.fixed_channel = params->channel_fixed;
1824
1825 if (params->ie) {
1826 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1827 GFP_KERNEL);
1828 if (sdata->u.ibss.ie)
1829 sdata->u.ibss.ie_len = params->ie_len;
1830 }
1831
1832 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1833 sdata->u.ibss.ibss_join_req = jiffies;
1834
1835 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1836 sdata->u.ibss.ssid_len = params->ssid_len;
1837
1838 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa,
1839 sizeof(sdata->u.ibss.ht_capa));
1840 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask,
1841 sizeof(sdata->u.ibss.ht_capa_mask));
1842
1843 /*
1844 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1845 * reserved, but an HT STA shall protect HT transmissions as though
1846 * the HT Protection field were set to non-HT mixed mode.
1847 *
1848 * In an IBSS, the RIFS Mode field of the HT Operation element is
1849 * also reserved, but an HT STA shall operate as though this field
1850 * were set to 1.
1851 */
1852
1853 sdata->vif.bss_conf.ht_operation_mode |=
1854 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1855 | IEEE80211_HT_PARAM_RIFS_MODE;
1856
1857 changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE;
1858 ieee80211_bss_info_change_notify(sdata, changed);
1859
1860 sdata->smps_mode = IEEE80211_SMPS_OFF;
1861 sdata->needed_rx_chains = local->rx_chains;
1862 sdata->control_port_over_nl80211 = params->control_port_over_nl80211;
1863
1864 ieee80211_queue_work(&local->hw, &sdata->work);
1865
1866 return 0;
1867 }
1868
ieee80211_ibss_leave(struct ieee80211_sub_if_data * sdata)1869 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1870 {
1871 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1872
1873 ieee80211_ibss_disconnect(sdata);
1874 ifibss->ssid_len = 0;
1875 eth_zero_addr(ifibss->bssid);
1876
1877 /* remove beacon */
1878 kfree(sdata->u.ibss.ie);
1879 sdata->u.ibss.ie = NULL;
1880 sdata->u.ibss.ie_len = 0;
1881
1882 /* on the next join, re-program HT parameters */
1883 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1884 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1885
1886 synchronize_rcu();
1887
1888 skb_queue_purge(&sdata->skb_queue);
1889
1890 del_timer_sync(&sdata->u.ibss.timer);
1891
1892 return 0;
1893 }
1894