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) 2018-2020 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 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
ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data * sdata)537 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
538 {
539 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
540 struct cfg80211_bss *cbss;
541
542 sdata_assert_lock(sdata);
543
544 /* update cfg80211 bss information with the new channel */
545 if (!is_zero_ether_addr(ifibss->bssid)) {
546 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
547 ifibss->chandef.chan,
548 ifibss->bssid, ifibss->ssid,
549 ifibss->ssid_len,
550 IEEE80211_BSS_TYPE_IBSS,
551 IEEE80211_PRIVACY(ifibss->privacy));
552 /* XXX: should not really modify cfg80211 data */
553 if (cbss) {
554 cbss->channel = sdata->csa_chandef.chan;
555 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
556 }
557 }
558
559 ifibss->chandef = sdata->csa_chandef;
560
561 /* generate the beacon */
562 return ieee80211_ibss_csa_beacon(sdata, NULL);
563 }
564
ieee80211_ibss_stop(struct ieee80211_sub_if_data * sdata)565 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
566 {
567 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
568
569 cancel_work_sync(&ifibss->csa_connection_drop_work);
570 }
571
ieee80211_ibss_finish_sta(struct sta_info * sta)572 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
573 __acquires(RCU)
574 {
575 struct ieee80211_sub_if_data *sdata = sta->sdata;
576 u8 addr[ETH_ALEN];
577
578 memcpy(addr, sta->sta.addr, ETH_ALEN);
579
580 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
581
582 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
583 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
584 /* authorize the station only if the network is not RSN protected. If
585 * not wait for the userspace to authorize it */
586 if (!sta->sdata->u.ibss.control_port)
587 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
588
589 rate_control_rate_init(sta);
590
591 /* If it fails, maybe we raced another insertion? */
592 if (sta_info_insert_rcu(sta))
593 return sta_info_get(sdata, addr);
594 return sta;
595 }
596
597 static struct sta_info *
ieee80211_ibss_add_sta(struct ieee80211_sub_if_data * sdata,const u8 * bssid,const u8 * addr,u32 supp_rates)598 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
599 const u8 *addr, u32 supp_rates)
600 __acquires(RCU)
601 {
602 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
603 struct ieee80211_local *local = sdata->local;
604 struct sta_info *sta;
605 struct ieee80211_chanctx_conf *chanctx_conf;
606 struct ieee80211_supported_band *sband;
607 enum nl80211_bss_scan_width scan_width;
608 int band;
609
610 /*
611 * XXX: Consider removing the least recently used entry and
612 * allow new one to be added.
613 */
614 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
615 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
616 sdata->name, addr);
617 rcu_read_lock();
618 return NULL;
619 }
620
621 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
622 rcu_read_lock();
623 return NULL;
624 }
625
626 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
627 rcu_read_lock();
628 return NULL;
629 }
630
631 rcu_read_lock();
632 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
633 if (WARN_ON_ONCE(!chanctx_conf))
634 return NULL;
635 band = chanctx_conf->def.chan->band;
636 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
637 rcu_read_unlock();
638
639 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
640 if (!sta) {
641 rcu_read_lock();
642 return NULL;
643 }
644
645 /* make sure mandatory rates are always added */
646 sband = local->hw.wiphy->bands[band];
647 sta->sta.supp_rates[band] = supp_rates |
648 ieee80211_mandatory_rates(sband, scan_width);
649
650 return ieee80211_ibss_finish_sta(sta);
651 }
652
ieee80211_sta_active_ibss(struct ieee80211_sub_if_data * sdata)653 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
654 {
655 struct ieee80211_local *local = sdata->local;
656 int active = 0;
657 struct sta_info *sta;
658
659 sdata_assert_lock(sdata);
660
661 rcu_read_lock();
662
663 list_for_each_entry_rcu(sta, &local->sta_list, list) {
664 unsigned long last_active = ieee80211_sta_last_active(sta);
665
666 if (sta->sdata == sdata &&
667 time_is_after_jiffies(last_active +
668 IEEE80211_IBSS_MERGE_INTERVAL)) {
669 active++;
670 break;
671 }
672 }
673
674 rcu_read_unlock();
675
676 return active;
677 }
678
ieee80211_ibss_disconnect(struct ieee80211_sub_if_data * sdata)679 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
680 {
681 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
682 struct ieee80211_local *local = sdata->local;
683 struct cfg80211_bss *cbss;
684 struct beacon_data *presp;
685 struct sta_info *sta;
686
687 if (!is_zero_ether_addr(ifibss->bssid)) {
688 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
689 ifibss->bssid, ifibss->ssid,
690 ifibss->ssid_len,
691 IEEE80211_BSS_TYPE_IBSS,
692 IEEE80211_PRIVACY(ifibss->privacy));
693
694 if (cbss) {
695 cfg80211_unlink_bss(local->hw.wiphy, cbss);
696 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
697 }
698 }
699
700 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
701
702 sta_info_flush(sdata);
703
704 spin_lock_bh(&ifibss->incomplete_lock);
705 while (!list_empty(&ifibss->incomplete_stations)) {
706 sta = list_first_entry(&ifibss->incomplete_stations,
707 struct sta_info, list);
708 list_del(&sta->list);
709 spin_unlock_bh(&ifibss->incomplete_lock);
710
711 sta_info_free(local, sta);
712 spin_lock_bh(&ifibss->incomplete_lock);
713 }
714 spin_unlock_bh(&ifibss->incomplete_lock);
715
716 netif_carrier_off(sdata->dev);
717
718 sdata->vif.bss_conf.ibss_joined = false;
719 sdata->vif.bss_conf.ibss_creator = false;
720 sdata->vif.bss_conf.enable_beacon = false;
721 sdata->vif.bss_conf.ssid_len = 0;
722
723 /* remove beacon */
724 presp = rcu_dereference_protected(ifibss->presp,
725 lockdep_is_held(&sdata->wdev.mtx));
726 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
727 if (presp)
728 kfree_rcu(presp, rcu_head);
729
730 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
731 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
732 BSS_CHANGED_IBSS);
733 drv_leave_ibss(local, sdata);
734 mutex_lock(&local->mtx);
735 ieee80211_vif_release_channel(sdata);
736 mutex_unlock(&local->mtx);
737 }
738
ieee80211_csa_connection_drop_work(struct work_struct * work)739 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
740 {
741 struct ieee80211_sub_if_data *sdata =
742 container_of(work, struct ieee80211_sub_if_data,
743 u.ibss.csa_connection_drop_work);
744
745 sdata_lock(sdata);
746
747 ieee80211_ibss_disconnect(sdata);
748 synchronize_rcu();
749 skb_queue_purge(&sdata->skb_queue);
750
751 /* trigger a scan to find another IBSS network to join */
752 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
753
754 sdata_unlock(sdata);
755 }
756
ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data * sdata)757 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
758 {
759 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
760 int err;
761
762 /* if the current channel is a DFS channel, mark the channel as
763 * unavailable.
764 */
765 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
766 &ifibss->chandef,
767 NL80211_IFTYPE_ADHOC);
768 if (err > 0)
769 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
770 GFP_ATOMIC);
771 }
772
773 static bool
ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data * sdata,struct ieee802_11_elems * elems,bool beacon)774 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
775 struct ieee802_11_elems *elems,
776 bool beacon)
777 {
778 struct cfg80211_csa_settings params;
779 struct ieee80211_csa_ie csa_ie;
780 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
781 enum nl80211_channel_type ch_type;
782 int err;
783 u32 sta_flags;
784 u32 vht_cap_info = 0;
785
786 sdata_assert_lock(sdata);
787
788 sta_flags = IEEE80211_STA_DISABLE_VHT;
789 switch (ifibss->chandef.width) {
790 case NL80211_CHAN_WIDTH_5:
791 case NL80211_CHAN_WIDTH_10:
792 case NL80211_CHAN_WIDTH_20_NOHT:
793 sta_flags |= IEEE80211_STA_DISABLE_HT;
794 fallthrough;
795 case NL80211_CHAN_WIDTH_20:
796 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
797 break;
798 default:
799 break;
800 }
801
802 if (elems->vht_cap_elem)
803 vht_cap_info = le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
804
805 memset(¶ms, 0, sizeof(params));
806 err = ieee80211_parse_ch_switch_ie(sdata, elems,
807 ifibss->chandef.chan->band,
808 vht_cap_info,
809 sta_flags, ifibss->bssid, &csa_ie);
810 /* can't switch to destination channel, fail */
811 if (err < 0)
812 goto disconnect;
813
814 /* did not contain a CSA */
815 if (err)
816 return false;
817
818 /* channel switch is not supported, disconnect */
819 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
820 goto disconnect;
821
822 params.count = csa_ie.count;
823 params.chandef = csa_ie.chandef;
824
825 switch (ifibss->chandef.width) {
826 case NL80211_CHAN_WIDTH_20_NOHT:
827 case NL80211_CHAN_WIDTH_20:
828 case NL80211_CHAN_WIDTH_40:
829 /* keep our current HT mode (HT20/HT40+/HT40-), even if
830 * another mode has been announced. The mode is not adopted
831 * within the beacon while doing CSA and we should therefore
832 * keep the mode which we announce.
833 */
834 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
835 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan,
836 ch_type);
837 break;
838 case NL80211_CHAN_WIDTH_5:
839 case NL80211_CHAN_WIDTH_10:
840 if (params.chandef.width != ifibss->chandef.width) {
841 sdata_info(sdata,
842 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
843 ifibss->bssid,
844 params.chandef.chan->center_freq,
845 params.chandef.width,
846 params.chandef.center_freq1,
847 params.chandef.center_freq2);
848 goto disconnect;
849 }
850 break;
851 default:
852 /* should not happen, sta_flags should prevent VHT modes. */
853 WARN_ON(1);
854 goto disconnect;
855 }
856
857 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef,
858 NL80211_IFTYPE_ADHOC)) {
859 sdata_info(sdata,
860 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
861 ifibss->bssid,
862 params.chandef.chan->center_freq,
863 params.chandef.width,
864 params.chandef.center_freq1,
865 params.chandef.center_freq2);
866 goto disconnect;
867 }
868
869 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
870 ¶ms.chandef,
871 NL80211_IFTYPE_ADHOC);
872 if (err < 0)
873 goto disconnect;
874 if (err > 0 && !ifibss->userspace_handles_dfs) {
875 /* IBSS-DFS only allowed with a control program */
876 goto disconnect;
877 }
878
879 params.radar_required = err;
880
881 if (cfg80211_chandef_identical(¶ms.chandef,
882 &sdata->vif.bss_conf.chandef)) {
883 ibss_dbg(sdata,
884 "received csa with an identical chandef, ignoring\n");
885 return true;
886 }
887
888 /* all checks done, now perform the channel switch. */
889 ibss_dbg(sdata,
890 "received channel switch announcement to go to channel %d MHz\n",
891 params.chandef.chan->center_freq);
892
893 params.block_tx = !!csa_ie.mode;
894
895 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
896 ¶ms))
897 goto disconnect;
898
899 ieee80211_ibss_csa_mark_radar(sdata);
900
901 return true;
902 disconnect:
903 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
904 ieee80211_queue_work(&sdata->local->hw,
905 &ifibss->csa_connection_drop_work);
906
907 ieee80211_ibss_csa_mark_radar(sdata);
908
909 return true;
910 }
911
912 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)913 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
914 struct ieee80211_mgmt *mgmt, size_t len,
915 struct ieee80211_rx_status *rx_status,
916 struct ieee802_11_elems *elems)
917 {
918 int required_len;
919
920 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
921 return;
922
923 /* CSA is the only action we handle for now */
924 if (mgmt->u.action.u.measurement.action_code !=
925 WLAN_ACTION_SPCT_CHL_SWITCH)
926 return;
927
928 required_len = IEEE80211_MIN_ACTION_SIZE +
929 sizeof(mgmt->u.action.u.chan_switch);
930 if (len < required_len)
931 return;
932
933 if (!sdata->vif.csa_active)
934 ieee80211_ibss_process_chanswitch(sdata, elems, false);
935 }
936
ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)937 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
938 struct ieee80211_mgmt *mgmt,
939 size_t len)
940 {
941 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
942
943 if (len < IEEE80211_DEAUTH_FRAME_LEN)
944 return;
945
946 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
947 ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason);
948 sta_info_destroy_addr(sdata, mgmt->sa);
949 }
950
ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)951 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
952 struct ieee80211_mgmt *mgmt,
953 size_t len)
954 {
955 u16 auth_alg, auth_transaction;
956
957 sdata_assert_lock(sdata);
958
959 if (len < 24 + 6)
960 return;
961
962 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
963 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
964
965 ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
966 ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n",
967 mgmt->bssid, auth_transaction);
968
969 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
970 return;
971
972 /*
973 * IEEE 802.11 standard does not require authentication in IBSS
974 * networks and most implementations do not seem to use it.
975 * However, try to reply to authentication attempts if someone
976 * has actually implemented this.
977 */
978 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
979 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
980 }
981
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)982 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
983 struct ieee80211_mgmt *mgmt, size_t len,
984 struct ieee80211_rx_status *rx_status,
985 struct ieee802_11_elems *elems,
986 struct ieee80211_channel *channel)
987 {
988 struct sta_info *sta;
989 enum nl80211_band band = rx_status->band;
990 enum nl80211_bss_scan_width scan_width;
991 struct ieee80211_local *local = sdata->local;
992 struct ieee80211_supported_band *sband;
993 bool rates_updated = false;
994 u32 supp_rates = 0;
995
996 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
997 return;
998
999 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
1000 return;
1001
1002 sband = local->hw.wiphy->bands[band];
1003 if (WARN_ON(!sband))
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 /* make sure mandatory rates are always added */
1017 scan_width = NL80211_BSS_CHAN_WIDTH_20;
1018 if (rx_status->bw == RATE_INFO_BW_5)
1019 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1020 else if (rx_status->bw == RATE_INFO_BW_10)
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 || elems->s1g_capab) &&
1041 local->hw.queues >= IEEE80211_NUM_ACS) {
1042 sta->sta.wme = true;
1043 ieee80211_check_fast_xmit(sta);
1044 }
1045
1046 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1047 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1048 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1049 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1050 /* we both use HT */
1051 struct ieee80211_ht_cap htcap_ie;
1052 struct cfg80211_chan_def chandef;
1053 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
1054
1055 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT);
1056 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef);
1057
1058 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1059 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1060 &htcap_ie,
1061 sta);
1062
1063 if (elems->vht_operation && elems->vht_cap_elem &&
1064 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1065 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1066 /* we both use VHT */
1067 struct ieee80211_vht_cap cap_ie;
1068 struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap;
1069 u32 vht_cap_info =
1070 le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
1071
1072 ieee80211_chandef_vht_oper(&local->hw, vht_cap_info,
1073 elems->vht_operation,
1074 elems->ht_operation,
1075 &chandef);
1076 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1077 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1078 &cap_ie, sta);
1079 if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap)))
1080 rates_updated |= true;
1081 }
1082
1083 if (bw != sta->sta.bandwidth)
1084 rates_updated |= true;
1085
1086 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1087 &chandef))
1088 WARN_ON_ONCE(1);
1089 }
1090
1091 if (sta && rates_updated) {
1092 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1093 u8 rx_nss = sta->sta.rx_nss;
1094
1095 /* Force rx_nss recalculation */
1096 sta->sta.rx_nss = 0;
1097 rate_control_rate_init(sta);
1098 if (sta->sta.rx_nss != rx_nss)
1099 changed |= IEEE80211_RC_NSS_CHANGED;
1100
1101 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1102 }
1103
1104 rcu_read_unlock();
1105 }
1106
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)1107 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1108 struct ieee80211_mgmt *mgmt, size_t len,
1109 struct ieee80211_rx_status *rx_status,
1110 struct ieee802_11_elems *elems)
1111 {
1112 struct ieee80211_local *local = sdata->local;
1113 struct cfg80211_bss *cbss;
1114 struct ieee80211_bss *bss;
1115 struct ieee80211_channel *channel;
1116 u64 beacon_timestamp, rx_timestamp;
1117 u32 supp_rates = 0;
1118 enum nl80211_band band = rx_status->band;
1119
1120 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1121 if (!channel)
1122 return;
1123
1124 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1125
1126 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel);
1127 if (!bss)
1128 return;
1129
1130 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1131
1132 /* same for beacon and probe response */
1133 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1134
1135 /* check if we need to merge IBSS */
1136
1137 /* not an IBSS */
1138 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1139 goto put_bss;
1140
1141 /* different channel */
1142 if (sdata->u.ibss.fixed_channel &&
1143 sdata->u.ibss.chandef.chan != cbss->channel)
1144 goto put_bss;
1145
1146 /* different SSID */
1147 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1148 memcmp(elems->ssid, sdata->u.ibss.ssid,
1149 sdata->u.ibss.ssid_len))
1150 goto put_bss;
1151
1152 /* process channel switch */
1153 if (sdata->vif.csa_active ||
1154 ieee80211_ibss_process_chanswitch(sdata, elems, true))
1155 goto put_bss;
1156
1157 /* same BSSID */
1158 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1159 goto put_bss;
1160
1161 /* we use a fixed BSSID */
1162 if (sdata->u.ibss.fixed_bssid)
1163 goto put_bss;
1164
1165 if (ieee80211_have_rx_timestamp(rx_status)) {
1166 /* time when timestamp field was received */
1167 rx_timestamp =
1168 ieee80211_calculate_rx_timestamp(local, rx_status,
1169 len + FCS_LEN, 24);
1170 } else {
1171 /*
1172 * second best option: get current TSF
1173 * (will return -1 if not supported)
1174 */
1175 rx_timestamp = drv_get_tsf(local, sdata);
1176 }
1177
1178 ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n",
1179 mgmt->sa, mgmt->bssid,
1180 (unsigned long long)rx_timestamp);
1181 ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n",
1182 (unsigned long long)beacon_timestamp,
1183 (unsigned long long)(rx_timestamp - beacon_timestamp),
1184 jiffies);
1185
1186 if (beacon_timestamp > rx_timestamp) {
1187 ibss_dbg(sdata,
1188 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1189 mgmt->bssid);
1190 ieee80211_sta_join_ibss(sdata, bss);
1191 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1192 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1193 supp_rates);
1194 rcu_read_unlock();
1195 }
1196
1197 put_bss:
1198 ieee80211_rx_bss_put(local, bss);
1199 }
1200
ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data * sdata,const u8 * bssid,const u8 * addr,u32 supp_rates)1201 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1202 const u8 *bssid, const u8 *addr,
1203 u32 supp_rates)
1204 {
1205 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1206 struct ieee80211_local *local = sdata->local;
1207 struct sta_info *sta;
1208 struct ieee80211_chanctx_conf *chanctx_conf;
1209 struct ieee80211_supported_band *sband;
1210 enum nl80211_bss_scan_width scan_width;
1211 int band;
1212
1213 /*
1214 * XXX: Consider removing the least recently used entry and
1215 * allow new one to be added.
1216 */
1217 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1218 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1219 sdata->name, addr);
1220 return;
1221 }
1222
1223 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1224 return;
1225
1226 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1227 return;
1228
1229 rcu_read_lock();
1230 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1231 if (WARN_ON_ONCE(!chanctx_conf)) {
1232 rcu_read_unlock();
1233 return;
1234 }
1235 band = chanctx_conf->def.chan->band;
1236 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1237 rcu_read_unlock();
1238
1239 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1240 if (!sta)
1241 return;
1242
1243 /* make sure mandatory rates are always added */
1244 sband = local->hw.wiphy->bands[band];
1245 sta->sta.supp_rates[band] = supp_rates |
1246 ieee80211_mandatory_rates(sband, scan_width);
1247
1248 spin_lock(&ifibss->incomplete_lock);
1249 list_add(&sta->list, &ifibss->incomplete_stations);
1250 spin_unlock(&ifibss->incomplete_lock);
1251 ieee80211_queue_work(&local->hw, &sdata->work);
1252 }
1253
ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data * sdata)1254 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1255 {
1256 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1257 struct ieee80211_local *local = sdata->local;
1258 struct sta_info *sta, *tmp;
1259 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1260 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1261
1262 mutex_lock(&local->sta_mtx);
1263
1264 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1265 unsigned long last_active = ieee80211_sta_last_active(sta);
1266
1267 if (sdata != sta->sdata)
1268 continue;
1269
1270 if (time_is_before_jiffies(last_active + exp_time) ||
1271 (time_is_before_jiffies(last_active + exp_rsn) &&
1272 sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1273 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
1274
1275 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1276 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1277 "not authorized " : "", sta->sta.addr);
1278
1279 ieee80211_send_deauth_disassoc(sdata, sta->sta.addr,
1280 ifibss->bssid,
1281 IEEE80211_STYPE_DEAUTH,
1282 WLAN_REASON_DEAUTH_LEAVING,
1283 true, frame_buf);
1284 WARN_ON(__sta_info_destroy(sta));
1285 }
1286 }
1287
1288 mutex_unlock(&local->sta_mtx);
1289 }
1290
1291 /*
1292 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1293 */
1294
ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data * sdata)1295 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1296 {
1297 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1298 enum nl80211_bss_scan_width scan_width;
1299
1300 sdata_assert_lock(sdata);
1301
1302 mod_timer(&ifibss->timer,
1303 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1304
1305 ieee80211_ibss_sta_expire(sdata);
1306
1307 if (time_before(jiffies, ifibss->last_scan_completed +
1308 IEEE80211_IBSS_MERGE_INTERVAL))
1309 return;
1310
1311 if (ieee80211_sta_active_ibss(sdata))
1312 return;
1313
1314 if (ifibss->fixed_channel)
1315 return;
1316
1317 sdata_info(sdata,
1318 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1319
1320 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1321 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1322 NULL, 0, scan_width);
1323 }
1324
ieee80211_sta_create_ibss(struct ieee80211_sub_if_data * sdata)1325 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1326 {
1327 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1328 u8 bssid[ETH_ALEN];
1329 u16 capability;
1330 int i;
1331
1332 sdata_assert_lock(sdata);
1333
1334 if (ifibss->fixed_bssid) {
1335 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1336 } else {
1337 /* Generate random, not broadcast, locally administered BSSID. Mix in
1338 * own MAC address to make sure that devices that do not have proper
1339 * random number generator get different BSSID. */
1340 get_random_bytes(bssid, ETH_ALEN);
1341 for (i = 0; i < ETH_ALEN; i++)
1342 bssid[i] ^= sdata->vif.addr[i];
1343 bssid[0] &= ~0x01;
1344 bssid[0] |= 0x02;
1345 }
1346
1347 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1348
1349 capability = WLAN_CAPABILITY_IBSS;
1350
1351 if (ifibss->privacy)
1352 capability |= WLAN_CAPABILITY_PRIVACY;
1353
1354 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1355 &ifibss->chandef, ifibss->basic_rates,
1356 capability, 0, true);
1357 }
1358
ibss_setup_channels(struct wiphy * wiphy,struct ieee80211_channel ** channels,unsigned int channels_max,u32 center_freq,u32 width)1359 static unsigned ibss_setup_channels(struct wiphy *wiphy,
1360 struct ieee80211_channel **channels,
1361 unsigned int channels_max,
1362 u32 center_freq, u32 width)
1363 {
1364 struct ieee80211_channel *chan = NULL;
1365 unsigned int n_chan = 0;
1366 u32 start_freq, end_freq, freq;
1367
1368 if (width <= 20) {
1369 start_freq = center_freq;
1370 end_freq = center_freq;
1371 } else {
1372 start_freq = center_freq - width / 2 + 10;
1373 end_freq = center_freq + width / 2 - 10;
1374 }
1375
1376 for (freq = start_freq; freq <= end_freq; freq += 20) {
1377 chan = ieee80211_get_channel(wiphy, freq);
1378 if (!chan)
1379 continue;
1380 if (n_chan >= channels_max)
1381 return n_chan;
1382
1383 channels[n_chan] = chan;
1384 n_chan++;
1385 }
1386
1387 return n_chan;
1388 }
1389
1390 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)1391 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1392 const struct cfg80211_chan_def *chandef,
1393 struct ieee80211_channel **channels,
1394 unsigned int channels_max)
1395 {
1396 unsigned int n_chan = 0;
1397 u32 width, cf1, cf2 = 0;
1398
1399 switch (chandef->width) {
1400 case NL80211_CHAN_WIDTH_40:
1401 width = 40;
1402 break;
1403 case NL80211_CHAN_WIDTH_80P80:
1404 cf2 = chandef->center_freq2;
1405 fallthrough;
1406 case NL80211_CHAN_WIDTH_80:
1407 width = 80;
1408 break;
1409 case NL80211_CHAN_WIDTH_160:
1410 width = 160;
1411 break;
1412 default:
1413 width = 20;
1414 break;
1415 }
1416
1417 cf1 = chandef->center_freq1;
1418
1419 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1420
1421 if (cf2)
1422 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1423 channels_max - n_chan, cf2,
1424 width);
1425
1426 return n_chan;
1427 }
1428
1429 /*
1430 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1431 */
1432
ieee80211_sta_find_ibss(struct ieee80211_sub_if_data * sdata)1433 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1434 {
1435 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1436 struct ieee80211_local *local = sdata->local;
1437 struct cfg80211_bss *cbss;
1438 struct ieee80211_channel *chan = NULL;
1439 const u8 *bssid = NULL;
1440 enum nl80211_bss_scan_width scan_width;
1441 int active_ibss;
1442
1443 sdata_assert_lock(sdata);
1444
1445 active_ibss = ieee80211_sta_active_ibss(sdata);
1446 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1447
1448 if (active_ibss)
1449 return;
1450
1451 if (ifibss->fixed_bssid)
1452 bssid = ifibss->bssid;
1453 if (ifibss->fixed_channel)
1454 chan = ifibss->chandef.chan;
1455 if (!is_zero_ether_addr(ifibss->bssid))
1456 bssid = ifibss->bssid;
1457 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1458 ifibss->ssid, ifibss->ssid_len,
1459 IEEE80211_BSS_TYPE_IBSS,
1460 IEEE80211_PRIVACY(ifibss->privacy));
1461
1462 if (cbss) {
1463 struct ieee80211_bss *bss;
1464
1465 bss = (void *)cbss->priv;
1466 ibss_dbg(sdata,
1467 "sta_find_ibss: selected %pM current %pM\n",
1468 cbss->bssid, ifibss->bssid);
1469 sdata_info(sdata,
1470 "Selected IBSS BSSID %pM based on configured SSID\n",
1471 cbss->bssid);
1472
1473 ieee80211_sta_join_ibss(sdata, bss);
1474 ieee80211_rx_bss_put(local, bss);
1475 return;
1476 }
1477
1478 /* if a fixed bssid and a fixed freq have been provided create the IBSS
1479 * directly and do not waste time scanning
1480 */
1481 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1482 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1483 bssid);
1484 ieee80211_sta_create_ibss(sdata);
1485 return;
1486 }
1487
1488
1489 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1490
1491 /* Selected IBSS not found in current scan results - try to scan */
1492 if (time_after(jiffies, ifibss->last_scan_completed +
1493 IEEE80211_SCAN_INTERVAL)) {
1494 struct ieee80211_channel *channels[8];
1495 unsigned int num;
1496
1497 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1498
1499 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1500
1501 if (ifibss->fixed_channel) {
1502 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1503 &ifibss->chandef,
1504 channels,
1505 ARRAY_SIZE(channels));
1506 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1507 ifibss->ssid_len, channels,
1508 num, scan_width);
1509 } else {
1510 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1511 ifibss->ssid_len, NULL,
1512 0, scan_width);
1513 }
1514 } else {
1515 int interval = IEEE80211_SCAN_INTERVAL;
1516
1517 if (time_after(jiffies, ifibss->ibss_join_req +
1518 IEEE80211_IBSS_JOIN_TIMEOUT))
1519 ieee80211_sta_create_ibss(sdata);
1520
1521 mod_timer(&ifibss->timer,
1522 round_jiffies(jiffies + interval));
1523 }
1524 }
1525
ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data * sdata,struct sk_buff * req)1526 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1527 struct sk_buff *req)
1528 {
1529 struct ieee80211_mgmt *mgmt = (void *)req->data;
1530 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1531 struct ieee80211_local *local = sdata->local;
1532 int tx_last_beacon, len = req->len;
1533 struct sk_buff *skb;
1534 struct beacon_data *presp;
1535 u8 *pos, *end;
1536
1537 sdata_assert_lock(sdata);
1538
1539 presp = rcu_dereference_protected(ifibss->presp,
1540 lockdep_is_held(&sdata->wdev.mtx));
1541
1542 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1543 len < 24 + 2 || !presp)
1544 return;
1545
1546 tx_last_beacon = drv_tx_last_beacon(local);
1547
1548 ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
1549 ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n",
1550 mgmt->bssid, tx_last_beacon);
1551
1552 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1553 return;
1554
1555 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1556 !is_broadcast_ether_addr(mgmt->bssid))
1557 return;
1558
1559 end = ((u8 *) mgmt) + len;
1560 pos = mgmt->u.probe_req.variable;
1561 if (pos[0] != WLAN_EID_SSID ||
1562 pos + 2 + pos[1] > end) {
1563 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1564 mgmt->sa);
1565 return;
1566 }
1567 if (pos[1] != 0 &&
1568 (pos[1] != ifibss->ssid_len ||
1569 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1570 /* Ignore ProbeReq for foreign SSID */
1571 return;
1572 }
1573
1574 /* Reply with ProbeResp */
1575 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1576 if (!skb)
1577 return;
1578
1579 skb_reserve(skb, local->tx_headroom);
1580 skb_put_data(skb, presp->head, presp->head_len);
1581
1582 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1583 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1584 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1585
1586 /* avoid excessive retries for probe request to wildcard SSIDs */
1587 if (pos[1] == 0)
1588 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1589
1590 ieee80211_tx_skb(sdata, skb);
1591 }
1592
1593 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)1594 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1595 struct ieee80211_mgmt *mgmt, size_t len,
1596 struct ieee80211_rx_status *rx_status)
1597 {
1598 size_t baselen;
1599 struct ieee802_11_elems elems;
1600
1601 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1602 offsetof(typeof(mgmt->u.beacon), variable));
1603
1604 /*
1605 * either beacon or probe_resp but the variable field is at the
1606 * same offset
1607 */
1608 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1609 if (baselen > len)
1610 return;
1611
1612 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1613 false, &elems, mgmt->bssid, NULL);
1614
1615 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1616 }
1617
ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1618 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1619 struct sk_buff *skb)
1620 {
1621 struct ieee80211_rx_status *rx_status;
1622 struct ieee80211_mgmt *mgmt;
1623 u16 fc;
1624 struct ieee802_11_elems elems;
1625 int ies_len;
1626
1627 rx_status = IEEE80211_SKB_RXCB(skb);
1628 mgmt = (struct ieee80211_mgmt *) skb->data;
1629 fc = le16_to_cpu(mgmt->frame_control);
1630
1631 sdata_lock(sdata);
1632
1633 if (!sdata->u.ibss.ssid_len)
1634 goto mgmt_out; /* not ready to merge yet */
1635
1636 switch (fc & IEEE80211_FCTL_STYPE) {
1637 case IEEE80211_STYPE_PROBE_REQ:
1638 ieee80211_rx_mgmt_probe_req(sdata, skb);
1639 break;
1640 case IEEE80211_STYPE_PROBE_RESP:
1641 case IEEE80211_STYPE_BEACON:
1642 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1643 rx_status);
1644 break;
1645 case IEEE80211_STYPE_AUTH:
1646 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1647 break;
1648 case IEEE80211_STYPE_DEAUTH:
1649 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1650 break;
1651 case IEEE80211_STYPE_ACTION:
1652 switch (mgmt->u.action.category) {
1653 case WLAN_CATEGORY_SPECTRUM_MGMT:
1654 ies_len = skb->len -
1655 offsetof(struct ieee80211_mgmt,
1656 u.action.u.chan_switch.variable);
1657
1658 if (ies_len < 0)
1659 break;
1660
1661 ieee802_11_parse_elems(
1662 mgmt->u.action.u.chan_switch.variable,
1663 ies_len, true, &elems, mgmt->bssid, NULL);
1664
1665 if (elems.parse_error)
1666 break;
1667
1668 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1669 rx_status, &elems);
1670 break;
1671 }
1672 }
1673
1674 mgmt_out:
1675 sdata_unlock(sdata);
1676 }
1677
ieee80211_ibss_work(struct ieee80211_sub_if_data * sdata)1678 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1679 {
1680 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1681 struct sta_info *sta;
1682
1683 sdata_lock(sdata);
1684
1685 /*
1686 * Work could be scheduled after scan or similar
1687 * when we aren't even joined (or trying) with a
1688 * network.
1689 */
1690 if (!ifibss->ssid_len)
1691 goto out;
1692
1693 spin_lock_bh(&ifibss->incomplete_lock);
1694 while (!list_empty(&ifibss->incomplete_stations)) {
1695 sta = list_first_entry(&ifibss->incomplete_stations,
1696 struct sta_info, list);
1697 list_del(&sta->list);
1698 spin_unlock_bh(&ifibss->incomplete_lock);
1699
1700 ieee80211_ibss_finish_sta(sta);
1701 rcu_read_unlock();
1702 spin_lock_bh(&ifibss->incomplete_lock);
1703 }
1704 spin_unlock_bh(&ifibss->incomplete_lock);
1705
1706 switch (ifibss->state) {
1707 case IEEE80211_IBSS_MLME_SEARCH:
1708 ieee80211_sta_find_ibss(sdata);
1709 break;
1710 case IEEE80211_IBSS_MLME_JOINED:
1711 ieee80211_sta_merge_ibss(sdata);
1712 break;
1713 default:
1714 WARN_ON(1);
1715 break;
1716 }
1717
1718 out:
1719 sdata_unlock(sdata);
1720 }
1721
ieee80211_ibss_timer(struct timer_list * t)1722 static void ieee80211_ibss_timer(struct timer_list *t)
1723 {
1724 struct ieee80211_sub_if_data *sdata =
1725 from_timer(sdata, t, u.ibss.timer);
1726
1727 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1728 }
1729
ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data * sdata)1730 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1731 {
1732 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1733
1734 timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0);
1735 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1736 spin_lock_init(&ifibss->incomplete_lock);
1737 INIT_WORK(&ifibss->csa_connection_drop_work,
1738 ieee80211_csa_connection_drop_work);
1739 }
1740
1741 /* scan finished notification */
ieee80211_ibss_notify_scan_completed(struct ieee80211_local * local)1742 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1743 {
1744 struct ieee80211_sub_if_data *sdata;
1745
1746 mutex_lock(&local->iflist_mtx);
1747 list_for_each_entry(sdata, &local->interfaces, list) {
1748 if (!ieee80211_sdata_running(sdata))
1749 continue;
1750 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1751 continue;
1752 sdata->u.ibss.last_scan_completed = jiffies;
1753 }
1754 mutex_unlock(&local->iflist_mtx);
1755 }
1756
ieee80211_ibss_join(struct ieee80211_sub_if_data * sdata,struct cfg80211_ibss_params * params)1757 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1758 struct cfg80211_ibss_params *params)
1759 {
1760 u32 changed = 0;
1761 u32 rate_flags;
1762 struct ieee80211_supported_band *sband;
1763 enum ieee80211_chanctx_mode chanmode;
1764 struct ieee80211_local *local = sdata->local;
1765 int radar_detect_width = 0;
1766 int i;
1767 int ret;
1768
1769 if (params->chandef.chan->freq_offset) {
1770 /* this may work, but is untested */
1771 return -EOPNOTSUPP;
1772 }
1773
1774 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1775 ¶ms->chandef,
1776 sdata->wdev.iftype);
1777 if (ret < 0)
1778 return ret;
1779
1780 if (ret > 0) {
1781 if (!params->userspace_handles_dfs)
1782 return -EINVAL;
1783 radar_detect_width = BIT(params->chandef.width);
1784 }
1785
1786 chanmode = (params->channel_fixed && !ret) ?
1787 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1788
1789 mutex_lock(&local->chanctx_mtx);
1790 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode,
1791 radar_detect_width);
1792 mutex_unlock(&local->chanctx_mtx);
1793 if (ret < 0)
1794 return ret;
1795
1796 if (params->bssid) {
1797 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1798 sdata->u.ibss.fixed_bssid = true;
1799 } else
1800 sdata->u.ibss.fixed_bssid = false;
1801
1802 sdata->u.ibss.privacy = params->privacy;
1803 sdata->u.ibss.control_port = params->control_port;
1804 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1805 sdata->u.ibss.basic_rates = params->basic_rates;
1806 sdata->u.ibss.last_scan_completed = jiffies;
1807
1808 /* fix basic_rates if channel does not support these rates */
1809 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef);
1810 sband = local->hw.wiphy->bands[params->chandef.chan->band];
1811 for (i = 0; i < sband->n_bitrates; i++) {
1812 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1813 sdata->u.ibss.basic_rates &= ~BIT(i);
1814 }
1815 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1816 sizeof(params->mcast_rate));
1817
1818 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1819
1820 sdata->u.ibss.chandef = params->chandef;
1821 sdata->u.ibss.fixed_channel = params->channel_fixed;
1822
1823 if (params->ie) {
1824 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1825 GFP_KERNEL);
1826 if (sdata->u.ibss.ie)
1827 sdata->u.ibss.ie_len = params->ie_len;
1828 }
1829
1830 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1831 sdata->u.ibss.ibss_join_req = jiffies;
1832
1833 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1834 sdata->u.ibss.ssid_len = params->ssid_len;
1835
1836 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa,
1837 sizeof(sdata->u.ibss.ht_capa));
1838 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask,
1839 sizeof(sdata->u.ibss.ht_capa_mask));
1840
1841 /*
1842 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1843 * reserved, but an HT STA shall protect HT transmissions as though
1844 * the HT Protection field were set to non-HT mixed mode.
1845 *
1846 * In an IBSS, the RIFS Mode field of the HT Operation element is
1847 * also reserved, but an HT STA shall operate as though this field
1848 * were set to 1.
1849 */
1850
1851 sdata->vif.bss_conf.ht_operation_mode |=
1852 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1853 | IEEE80211_HT_PARAM_RIFS_MODE;
1854
1855 changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE;
1856 ieee80211_bss_info_change_notify(sdata, changed);
1857
1858 sdata->smps_mode = IEEE80211_SMPS_OFF;
1859 sdata->needed_rx_chains = local->rx_chains;
1860 sdata->control_port_over_nl80211 = params->control_port_over_nl80211;
1861
1862 ieee80211_queue_work(&local->hw, &sdata->work);
1863
1864 return 0;
1865 }
1866
ieee80211_ibss_leave(struct ieee80211_sub_if_data * sdata)1867 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1868 {
1869 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1870
1871 ieee80211_ibss_disconnect(sdata);
1872 ifibss->ssid_len = 0;
1873 eth_zero_addr(ifibss->bssid);
1874
1875 /* remove beacon */
1876 kfree(sdata->u.ibss.ie);
1877
1878 /* on the next join, re-program HT parameters */
1879 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1880 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1881
1882 synchronize_rcu();
1883
1884 skb_queue_purge(&sdata->skb_queue);
1885
1886 del_timer_sync(&sdata->u.ibss.timer);
1887
1888 return 0;
1889 }
1890
