1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * IBSS mode implementation
4 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
5 * Copyright 2004, Instant802 Networks, Inc.
6 * Copyright 2005, Devicescape Software, Inc.
7 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
8 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
9 * Copyright 2009, Johannes Berg <johannes@sipsolutions.net>
10 * Copyright 2013-2014 Intel Mobile Communications GmbH
11 * Copyright(c) 2016 Intel Deutschland GmbH
12 * Copyright(c) 2018-2023 Intel Corporation
13 */
14
15 #include <linux/delay.h>
16 #include <linux/slab.h>
17 #include <linux/if_ether.h>
18 #include <linux/skbuff.h>
19 #include <linux/if_arp.h>
20 #include <linux/etherdevice.h>
21 #include <linux/rtnetlink.h>
22 #include <net/mac80211.h>
23
24 #include "ieee80211_i.h"
25 #include "driver-ops.h"
26 #include "rate.h"
27
28 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
29 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
30
31 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
32 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
33 #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ)
34
35 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
36
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 u64 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.cfg.ibss_joined) {
248 sdata->vif.cfg.ibss_joined = false;
249 sdata->vif.cfg.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 = sdata_dereference(ifibss->presp, sdata);
259 RCU_INIT_POINTER(ifibss->presp, NULL);
260 if (presp)
261 kfree_rcu(presp, rcu_head);
262
263 /* make a copy of the chandef, it could be modified below. */
264 chandef = *req_chandef;
265 chan = chandef.chan;
266 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
267 NL80211_IFTYPE_ADHOC)) {
268 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
269 chandef.width == NL80211_CHAN_WIDTH_10 ||
270 chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
271 chandef.width == NL80211_CHAN_WIDTH_20) {
272 sdata_info(sdata,
273 "Failed to join IBSS, beacons forbidden\n");
274 return;
275 }
276 chandef.width = NL80211_CHAN_WIDTH_20;
277 chandef.center_freq1 = chan->center_freq;
278 /* check again for downgraded chandef */
279 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
280 NL80211_IFTYPE_ADHOC)) {
281 sdata_info(sdata,
282 "Failed to join IBSS, beacons forbidden\n");
283 return;
284 }
285 }
286
287 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
288 &chandef, NL80211_IFTYPE_ADHOC);
289 if (err < 0) {
290 sdata_info(sdata,
291 "Failed to join IBSS, invalid chandef\n");
292 return;
293 }
294 if (err > 0 && !ifibss->userspace_handles_dfs) {
295 sdata_info(sdata,
296 "Failed to join IBSS, DFS channel without control program\n");
297 return;
298 }
299
300 radar_required = err;
301
302 mutex_lock(&local->mtx);
303 if (ieee80211_link_use_channel(&sdata->deflink, &chandef,
304 ifibss->fixed_channel ?
305 IEEE80211_CHANCTX_SHARED :
306 IEEE80211_CHANCTX_EXCLUSIVE)) {
307 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
308 mutex_unlock(&local->mtx);
309 return;
310 }
311 sdata->deflink.radar_required = radar_required;
312 mutex_unlock(&local->mtx);
313
314 memcpy(ifibss->bssid, bssid, ETH_ALEN);
315
316 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
317 capability, tsf, &chandef,
318 &have_higher_than_11mbit, NULL);
319 if (!presp)
320 return;
321
322 rcu_assign_pointer(ifibss->presp, presp);
323 mgmt = (void *)presp->head;
324
325 sdata->vif.bss_conf.enable_beacon = true;
326 sdata->vif.bss_conf.beacon_int = beacon_int;
327 sdata->vif.bss_conf.basic_rates = basic_rates;
328 sdata->vif.cfg.ssid_len = ifibss->ssid_len;
329 memcpy(sdata->vif.cfg.ssid, ifibss->ssid, ifibss->ssid_len);
330 bss_change = BSS_CHANGED_BEACON_INT;
331 bss_change |= ieee80211_reset_erp_info(sdata);
332 bss_change |= BSS_CHANGED_BSSID;
333 bss_change |= BSS_CHANGED_BEACON;
334 bss_change |= BSS_CHANGED_BEACON_ENABLED;
335 bss_change |= BSS_CHANGED_BASIC_RATES;
336 bss_change |= BSS_CHANGED_HT;
337 bss_change |= BSS_CHANGED_IBSS;
338 bss_change |= BSS_CHANGED_SSID;
339
340 /*
341 * In 5 GHz/802.11a, we can always use short slot time.
342 * (IEEE 802.11-2012 18.3.8.7)
343 *
344 * In 2.4GHz, we must always use long slots in IBSS for compatibility
345 * reasons.
346 * (IEEE 802.11-2012 19.4.5)
347 *
348 * HT follows these specifications (IEEE 802.11-2012 20.3.18)
349 */
350 sdata->vif.bss_conf.use_short_slot = chan->band == NL80211_BAND_5GHZ;
351 bss_change |= BSS_CHANGED_ERP_SLOT;
352
353 /* cf. IEEE 802.11 9.2.12 */
354 sdata->deflink.operating_11g_mode =
355 chan->band == NL80211_BAND_2GHZ && have_higher_than_11mbit;
356
357 ieee80211_set_wmm_default(&sdata->deflink, true, false);
358
359 sdata->vif.cfg.ibss_joined = true;
360 sdata->vif.cfg.ibss_creator = creator;
361
362 err = drv_join_ibss(local, sdata);
363 if (err) {
364 sdata->vif.cfg.ibss_joined = false;
365 sdata->vif.cfg.ibss_creator = false;
366 sdata->vif.bss_conf.enable_beacon = false;
367 sdata->vif.cfg.ssid_len = 0;
368 RCU_INIT_POINTER(ifibss->presp, NULL);
369 kfree_rcu(presp, rcu_head);
370 mutex_lock(&local->mtx);
371 ieee80211_link_release_channel(&sdata->deflink);
372 mutex_unlock(&local->mtx);
373 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
374 err);
375 return;
376 }
377
378 ieee80211_bss_info_change_notify(sdata, bss_change);
379
380 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
381 mod_timer(&ifibss->timer,
382 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
383
384 bss_meta.chan = chan;
385 bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt,
386 presp->head_len, GFP_KERNEL);
387
388 cfg80211_put_bss(local->hw.wiphy, bss);
389 netif_carrier_on(sdata->dev);
390 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
391 }
392
ieee80211_sta_join_ibss(struct ieee80211_sub_if_data * sdata,struct ieee80211_bss * bss)393 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
394 struct ieee80211_bss *bss)
395 {
396 struct cfg80211_bss *cbss =
397 container_of((void *)bss, struct cfg80211_bss, priv);
398 struct ieee80211_supported_band *sband;
399 struct cfg80211_chan_def chandef;
400 u32 basic_rates;
401 int i, j;
402 u16 beacon_int = cbss->beacon_interval;
403 const struct cfg80211_bss_ies *ies;
404 enum nl80211_channel_type chan_type;
405 u64 tsf;
406 u32 rate_flags;
407 int shift;
408
409 sdata_assert_lock(sdata);
410
411 if (beacon_int < 10)
412 beacon_int = 10;
413
414 switch (sdata->u.ibss.chandef.width) {
415 case NL80211_CHAN_WIDTH_20_NOHT:
416 case NL80211_CHAN_WIDTH_20:
417 case NL80211_CHAN_WIDTH_40:
418 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
419 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
420 break;
421 case NL80211_CHAN_WIDTH_5:
422 case NL80211_CHAN_WIDTH_10:
423 cfg80211_chandef_create(&chandef, cbss->channel,
424 NL80211_CHAN_NO_HT);
425 chandef.width = sdata->u.ibss.chandef.width;
426 break;
427 case NL80211_CHAN_WIDTH_80:
428 case NL80211_CHAN_WIDTH_80P80:
429 case NL80211_CHAN_WIDTH_160:
430 chandef = sdata->u.ibss.chandef;
431 chandef.chan = cbss->channel;
432 break;
433 default:
434 /* fall back to 20 MHz for unsupported modes */
435 cfg80211_chandef_create(&chandef, cbss->channel,
436 NL80211_CHAN_NO_HT);
437 break;
438 }
439
440 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
441 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
442 shift = ieee80211_vif_get_shift(&sdata->vif);
443
444 basic_rates = 0;
445
446 for (i = 0; i < bss->supp_rates_len; i++) {
447 int rate = bss->supp_rates[i] & 0x7f;
448 bool is_basic = !!(bss->supp_rates[i] & 0x80);
449
450 for (j = 0; j < sband->n_bitrates; j++) {
451 int brate;
452 if ((rate_flags & sband->bitrates[j].flags)
453 != rate_flags)
454 continue;
455
456 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
457 5 * (1 << shift));
458 if (brate == rate) {
459 if (is_basic)
460 basic_rates |= BIT(j);
461 break;
462 }
463 }
464 }
465
466 rcu_read_lock();
467 ies = rcu_dereference(cbss->ies);
468 tsf = ies->tsf;
469 rcu_read_unlock();
470
471 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
472 beacon_int,
473 &chandef,
474 basic_rates,
475 cbss->capability,
476 tsf, false);
477 }
478
ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data * sdata,struct cfg80211_csa_settings * csa_settings,u64 * changed)479 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
480 struct cfg80211_csa_settings *csa_settings,
481 u64 *changed)
482 {
483 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
484 struct beacon_data *presp, *old_presp;
485 struct cfg80211_bss *cbss;
486 const struct cfg80211_bss_ies *ies;
487 u16 capability = WLAN_CAPABILITY_IBSS;
488 u64 tsf;
489
490 sdata_assert_lock(sdata);
491
492 if (ifibss->privacy)
493 capability |= WLAN_CAPABILITY_PRIVACY;
494
495 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
496 ifibss->bssid, ifibss->ssid,
497 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS,
498 IEEE80211_PRIVACY(ifibss->privacy));
499
500 if (WARN_ON(!cbss))
501 return -EINVAL;
502
503 rcu_read_lock();
504 ies = rcu_dereference(cbss->ies);
505 tsf = ies->tsf;
506 rcu_read_unlock();
507 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
508
509 old_presp = sdata_dereference(ifibss->presp, sdata);
510
511 presp = ieee80211_ibss_build_presp(sdata,
512 sdata->vif.bss_conf.beacon_int,
513 sdata->vif.bss_conf.basic_rates,
514 capability, tsf, &ifibss->chandef,
515 NULL, csa_settings);
516 if (!presp)
517 return -ENOMEM;
518
519 rcu_assign_pointer(ifibss->presp, presp);
520 if (old_presp)
521 kfree_rcu(old_presp, rcu_head);
522
523 *changed |= BSS_CHANGED_BEACON;
524 return 0;
525 }
526
ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data * sdata,u64 * changed)527 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata, u64 *changed)
528 {
529 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
530 struct cfg80211_bss *cbss;
531
532 sdata_assert_lock(sdata);
533
534 /* When not connected/joined, sending CSA doesn't make sense. */
535 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED)
536 return -ENOLINK;
537
538 /* update cfg80211 bss information with the new channel */
539 if (!is_zero_ether_addr(ifibss->bssid)) {
540 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
541 ifibss->chandef.chan,
542 ifibss->bssid, ifibss->ssid,
543 ifibss->ssid_len,
544 IEEE80211_BSS_TYPE_IBSS,
545 IEEE80211_PRIVACY(ifibss->privacy));
546 /* XXX: should not really modify cfg80211 data */
547 if (cbss) {
548 cbss->channel = sdata->deflink.csa_chandef.chan;
549 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
550 }
551 }
552
553 ifibss->chandef = sdata->deflink.csa_chandef;
554
555 /* generate the beacon */
556 return ieee80211_ibss_csa_beacon(sdata, NULL, changed);
557 }
558
ieee80211_ibss_stop(struct ieee80211_sub_if_data * sdata)559 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
560 {
561 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
562
563 wiphy_work_cancel(sdata->local->hw.wiphy,
564 &ifibss->csa_connection_drop_work);
565 }
566
ieee80211_ibss_finish_sta(struct sta_info * sta)567 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
568 __acquires(RCU)
569 {
570 struct ieee80211_sub_if_data *sdata = sta->sdata;
571 u8 addr[ETH_ALEN];
572
573 memcpy(addr, sta->sta.addr, ETH_ALEN);
574
575 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
576
577 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
578 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
579 /* authorize the station only if the network is not RSN protected. If
580 * not wait for the userspace to authorize it */
581 if (!sta->sdata->u.ibss.control_port)
582 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
583
584 rate_control_rate_init(sta);
585
586 /* If it fails, maybe we raced another insertion? */
587 if (sta_info_insert_rcu(sta))
588 return sta_info_get(sdata, addr);
589 return sta;
590 }
591
592 static struct sta_info *
ieee80211_ibss_add_sta(struct ieee80211_sub_if_data * sdata,const u8 * bssid,const u8 * addr,u32 supp_rates)593 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
594 const u8 *addr, u32 supp_rates)
595 __acquires(RCU)
596 {
597 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
598 struct ieee80211_local *local = sdata->local;
599 struct sta_info *sta;
600 struct ieee80211_chanctx_conf *chanctx_conf;
601 struct ieee80211_supported_band *sband;
602 int band;
603
604 /*
605 * XXX: Consider removing the least recently used entry and
606 * allow new one to be added.
607 */
608 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
609 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
610 sdata->name, addr);
611 rcu_read_lock();
612 return NULL;
613 }
614
615 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
616 rcu_read_lock();
617 return NULL;
618 }
619
620 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
621 rcu_read_lock();
622 return NULL;
623 }
624
625 rcu_read_lock();
626 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
627 if (WARN_ON_ONCE(!chanctx_conf))
628 return NULL;
629 band = chanctx_conf->def.chan->band;
630 rcu_read_unlock();
631
632 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
633 if (!sta) {
634 rcu_read_lock();
635 return NULL;
636 }
637
638 /* make sure mandatory rates are always added */
639 sband = local->hw.wiphy->bands[band];
640 sta->sta.deflink.supp_rates[band] = supp_rates |
641 ieee80211_mandatory_rates(sband);
642
643 return ieee80211_ibss_finish_sta(sta);
644 }
645
ieee80211_sta_active_ibss(struct ieee80211_sub_if_data * sdata)646 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
647 {
648 struct ieee80211_local *local = sdata->local;
649 int active = 0;
650 struct sta_info *sta;
651
652 sdata_assert_lock(sdata);
653
654 rcu_read_lock();
655
656 list_for_each_entry_rcu(sta, &local->sta_list, list) {
657 unsigned long last_active = ieee80211_sta_last_active(sta);
658
659 if (sta->sdata == sdata &&
660 time_is_after_jiffies(last_active +
661 IEEE80211_IBSS_MERGE_INTERVAL)) {
662 active++;
663 break;
664 }
665 }
666
667 rcu_read_unlock();
668
669 return active;
670 }
671
ieee80211_ibss_disconnect(struct ieee80211_sub_if_data * sdata)672 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
673 {
674 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
675 struct ieee80211_local *local = sdata->local;
676 struct cfg80211_bss *cbss;
677 struct beacon_data *presp;
678 struct sta_info *sta;
679
680 if (!is_zero_ether_addr(ifibss->bssid)) {
681 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
682 ifibss->bssid, ifibss->ssid,
683 ifibss->ssid_len,
684 IEEE80211_BSS_TYPE_IBSS,
685 IEEE80211_PRIVACY(ifibss->privacy));
686
687 if (cbss) {
688 cfg80211_unlink_bss(local->hw.wiphy, cbss);
689 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
690 }
691 }
692
693 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
694
695 sta_info_flush(sdata);
696
697 spin_lock_bh(&ifibss->incomplete_lock);
698 while (!list_empty(&ifibss->incomplete_stations)) {
699 sta = list_first_entry(&ifibss->incomplete_stations,
700 struct sta_info, list);
701 list_del(&sta->list);
702 spin_unlock_bh(&ifibss->incomplete_lock);
703
704 sta_info_free(local, sta);
705 spin_lock_bh(&ifibss->incomplete_lock);
706 }
707 spin_unlock_bh(&ifibss->incomplete_lock);
708
709 netif_carrier_off(sdata->dev);
710
711 sdata->vif.cfg.ibss_joined = false;
712 sdata->vif.cfg.ibss_creator = false;
713 sdata->vif.bss_conf.enable_beacon = false;
714 sdata->vif.cfg.ssid_len = 0;
715
716 /* remove beacon */
717 presp = sdata_dereference(ifibss->presp, sdata);
718 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
719 if (presp)
720 kfree_rcu(presp, rcu_head);
721
722 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
723 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
724 BSS_CHANGED_IBSS);
725 drv_leave_ibss(local, sdata);
726 mutex_lock(&local->mtx);
727 ieee80211_link_release_channel(&sdata->deflink);
728 mutex_unlock(&local->mtx);
729 }
730
ieee80211_csa_connection_drop_work(struct wiphy * wiphy,struct wiphy_work * work)731 static void ieee80211_csa_connection_drop_work(struct wiphy *wiphy,
732 struct wiphy_work *work)
733 {
734 struct ieee80211_sub_if_data *sdata =
735 container_of(work, struct ieee80211_sub_if_data,
736 u.ibss.csa_connection_drop_work);
737
738 sdata_lock(sdata);
739
740 ieee80211_ibss_disconnect(sdata);
741 synchronize_rcu();
742 skb_queue_purge(&sdata->skb_queue);
743
744 /* trigger a scan to find another IBSS network to join */
745 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
746
747 sdata_unlock(sdata);
748 }
749
ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data * sdata)750 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
751 {
752 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
753 int err;
754
755 /* if the current channel is a DFS channel, mark the channel as
756 * unavailable.
757 */
758 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
759 &ifibss->chandef,
760 NL80211_IFTYPE_ADHOC);
761 if (err > 0)
762 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
763 GFP_ATOMIC);
764 }
765
766 static bool
ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data * sdata,struct ieee802_11_elems * elems,bool beacon)767 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
768 struct ieee802_11_elems *elems,
769 bool beacon)
770 {
771 struct cfg80211_csa_settings params;
772 struct ieee80211_csa_ie csa_ie;
773 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
774 enum nl80211_channel_type ch_type;
775 int err;
776 ieee80211_conn_flags_t conn_flags;
777 u32 vht_cap_info = 0;
778
779 sdata_assert_lock(sdata);
780
781 conn_flags = IEEE80211_CONN_DISABLE_VHT;
782
783 switch (ifibss->chandef.width) {
784 case NL80211_CHAN_WIDTH_5:
785 case NL80211_CHAN_WIDTH_10:
786 case NL80211_CHAN_WIDTH_20_NOHT:
787 conn_flags |= IEEE80211_CONN_DISABLE_HT;
788 fallthrough;
789 case NL80211_CHAN_WIDTH_20:
790 conn_flags |= IEEE80211_CONN_DISABLE_40MHZ;
791 break;
792 default:
793 break;
794 }
795
796 if (elems->vht_cap_elem)
797 vht_cap_info = le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
798
799 memset(¶ms, 0, sizeof(params));
800 err = ieee80211_parse_ch_switch_ie(sdata, elems,
801 ifibss->chandef.chan->band,
802 vht_cap_info,
803 conn_flags, ifibss->bssid, &csa_ie);
804 /* can't switch to destination channel, fail */
805 if (err < 0)
806 goto disconnect;
807
808 /* did not contain a CSA */
809 if (err)
810 return false;
811
812 /* channel switch is not supported, disconnect */
813 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
814 goto disconnect;
815
816 params.count = csa_ie.count;
817 params.chandef = csa_ie.chandef;
818
819 switch (ifibss->chandef.width) {
820 case NL80211_CHAN_WIDTH_20_NOHT:
821 case NL80211_CHAN_WIDTH_20:
822 case NL80211_CHAN_WIDTH_40:
823 /* keep our current HT mode (HT20/HT40+/HT40-), even if
824 * another mode has been announced. The mode is not adopted
825 * within the beacon while doing CSA and we should therefore
826 * keep the mode which we announce.
827 */
828 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
829 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan,
830 ch_type);
831 break;
832 case NL80211_CHAN_WIDTH_5:
833 case NL80211_CHAN_WIDTH_10:
834 if (params.chandef.width != ifibss->chandef.width) {
835 sdata_info(sdata,
836 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
837 ifibss->bssid,
838 params.chandef.chan->center_freq,
839 params.chandef.width,
840 params.chandef.center_freq1,
841 params.chandef.center_freq2);
842 goto disconnect;
843 }
844 break;
845 default:
846 /* should not happen, conn_flags should prevent VHT modes. */
847 WARN_ON(1);
848 goto disconnect;
849 }
850
851 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef,
852 NL80211_IFTYPE_ADHOC)) {
853 sdata_info(sdata,
854 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
855 ifibss->bssid,
856 params.chandef.chan->center_freq,
857 params.chandef.width,
858 params.chandef.center_freq1,
859 params.chandef.center_freq2);
860 goto disconnect;
861 }
862
863 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
864 ¶ms.chandef,
865 NL80211_IFTYPE_ADHOC);
866 if (err < 0)
867 goto disconnect;
868 if (err > 0 && !ifibss->userspace_handles_dfs) {
869 /* IBSS-DFS only allowed with a control program */
870 goto disconnect;
871 }
872
873 params.radar_required = err;
874
875 if (cfg80211_chandef_identical(¶ms.chandef,
876 &sdata->vif.bss_conf.chandef)) {
877 ibss_dbg(sdata,
878 "received csa with an identical chandef, ignoring\n");
879 return true;
880 }
881
882 /* all checks done, now perform the channel switch. */
883 ibss_dbg(sdata,
884 "received channel switch announcement to go to channel %d MHz\n",
885 params.chandef.chan->center_freq);
886
887 params.block_tx = !!csa_ie.mode;
888
889 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
890 ¶ms))
891 goto disconnect;
892
893 ieee80211_ibss_csa_mark_radar(sdata);
894
895 return true;
896 disconnect:
897 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
898 wiphy_work_queue(sdata->local->hw.wiphy,
899 &ifibss->csa_connection_drop_work);
900
901 ieee80211_ibss_csa_mark_radar(sdata);
902
903 return true;
904 }
905
906 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)907 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
908 struct ieee80211_mgmt *mgmt, size_t len,
909 struct ieee80211_rx_status *rx_status,
910 struct ieee802_11_elems *elems)
911 {
912 int required_len;
913
914 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
915 return;
916
917 /* CSA is the only action we handle for now */
918 if (mgmt->u.action.u.measurement.action_code !=
919 WLAN_ACTION_SPCT_CHL_SWITCH)
920 return;
921
922 required_len = IEEE80211_MIN_ACTION_SIZE +
923 sizeof(mgmt->u.action.u.chan_switch);
924 if (len < required_len)
925 return;
926
927 if (!sdata->vif.bss_conf.csa_active)
928 ieee80211_ibss_process_chanswitch(sdata, elems, false);
929 }
930
ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)931 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
932 struct ieee80211_mgmt *mgmt,
933 size_t len)
934 {
935 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
936
937 if (len < IEEE80211_DEAUTH_FRAME_LEN)
938 return;
939
940 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
941 ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason);
942 sta_info_destroy_addr(sdata, mgmt->sa);
943 }
944
ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)945 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
946 struct ieee80211_mgmt *mgmt,
947 size_t len)
948 {
949 u16 auth_alg, auth_transaction;
950
951 sdata_assert_lock(sdata);
952
953 if (len < 24 + 6)
954 return;
955
956 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
957 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
958
959 ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
960 ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n",
961 mgmt->bssid, auth_transaction);
962
963 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
964 return;
965
966 /*
967 * IEEE 802.11 standard does not require authentication in IBSS
968 * networks and most implementations do not seem to use it.
969 * However, try to reply to authentication attempts if someone
970 * has actually implemented this.
971 */
972 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
973 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
974 }
975
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)976 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
977 struct ieee80211_mgmt *mgmt, size_t len,
978 struct ieee80211_rx_status *rx_status,
979 struct ieee802_11_elems *elems,
980 struct ieee80211_channel *channel)
981 {
982 struct sta_info *sta;
983 enum nl80211_band band = rx_status->band;
984 struct ieee80211_local *local = sdata->local;
985 struct ieee80211_supported_band *sband;
986 bool rates_updated = false;
987 u32 supp_rates = 0;
988
989 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
990 return;
991
992 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
993 return;
994
995 sband = local->hw.wiphy->bands[band];
996 if (WARN_ON(!sband))
997 return;
998
999 rcu_read_lock();
1000 sta = sta_info_get(sdata, mgmt->sa);
1001
1002 if (elems->supp_rates) {
1003 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1004 band, NULL);
1005 if (sta) {
1006 u32 prev_rates;
1007
1008 prev_rates = sta->sta.deflink.supp_rates[band];
1009
1010 sta->sta.deflink.supp_rates[band] = supp_rates |
1011 ieee80211_mandatory_rates(sband);
1012 if (sta->sta.deflink.supp_rates[band] != prev_rates) {
1013 ibss_dbg(sdata,
1014 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1015 sta->sta.addr, prev_rates,
1016 sta->sta.deflink.supp_rates[band]);
1017 rates_updated = true;
1018 }
1019 } else {
1020 rcu_read_unlock();
1021 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1022 mgmt->sa, supp_rates);
1023 }
1024 }
1025
1026 if (sta && !sta->sta.wme &&
1027 (elems->wmm_info || elems->s1g_capab) &&
1028 local->hw.queues >= IEEE80211_NUM_ACS) {
1029 sta->sta.wme = true;
1030 ieee80211_check_fast_xmit(sta);
1031 }
1032
1033 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1034 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1035 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1036 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1037 /* we both use HT */
1038 struct ieee80211_ht_cap htcap_ie;
1039 struct cfg80211_chan_def chandef;
1040 enum ieee80211_sta_rx_bandwidth bw = sta->sta.deflink.bandwidth;
1041
1042 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT);
1043 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef);
1044
1045 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1046 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1047 &htcap_ie,
1048 &sta->deflink);
1049
1050 if (elems->vht_operation && elems->vht_cap_elem &&
1051 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1052 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1053 /* we both use VHT */
1054 struct ieee80211_vht_cap cap_ie;
1055 struct ieee80211_sta_vht_cap cap = sta->sta.deflink.vht_cap;
1056 u32 vht_cap_info =
1057 le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
1058
1059 ieee80211_chandef_vht_oper(&local->hw, vht_cap_info,
1060 elems->vht_operation,
1061 elems->ht_operation,
1062 &chandef);
1063 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1064 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1065 &cap_ie, NULL,
1066 &sta->deflink);
1067 if (memcmp(&cap, &sta->sta.deflink.vht_cap, sizeof(cap)))
1068 rates_updated |= true;
1069 }
1070
1071 if (bw != sta->sta.deflink.bandwidth)
1072 rates_updated |= true;
1073
1074 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1075 &chandef))
1076 WARN_ON_ONCE(1);
1077 }
1078
1079 if (sta && rates_updated) {
1080 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1081 u8 rx_nss = sta->sta.deflink.rx_nss;
1082
1083 /* Force rx_nss recalculation */
1084 sta->sta.deflink.rx_nss = 0;
1085 rate_control_rate_init(sta);
1086 if (sta->sta.deflink.rx_nss != rx_nss)
1087 changed |= IEEE80211_RC_NSS_CHANGED;
1088
1089 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1090 }
1091
1092 rcu_read_unlock();
1093 }
1094
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)1095 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1096 struct ieee80211_mgmt *mgmt, size_t len,
1097 struct ieee80211_rx_status *rx_status,
1098 struct ieee802_11_elems *elems)
1099 {
1100 struct ieee80211_local *local = sdata->local;
1101 struct cfg80211_bss *cbss;
1102 struct ieee80211_bss *bss;
1103 struct ieee80211_channel *channel;
1104 u64 beacon_timestamp, rx_timestamp;
1105 u32 supp_rates = 0;
1106 enum nl80211_band band = rx_status->band;
1107
1108 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1109 if (!channel)
1110 return;
1111
1112 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1113
1114 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel);
1115 if (!bss)
1116 return;
1117
1118 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1119
1120 /* same for beacon and probe response */
1121 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1122
1123 /* check if we need to merge IBSS */
1124
1125 /* not an IBSS */
1126 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1127 goto put_bss;
1128
1129 /* different channel */
1130 if (sdata->u.ibss.fixed_channel &&
1131 sdata->u.ibss.chandef.chan != cbss->channel)
1132 goto put_bss;
1133
1134 /* different SSID */
1135 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1136 memcmp(elems->ssid, sdata->u.ibss.ssid,
1137 sdata->u.ibss.ssid_len))
1138 goto put_bss;
1139
1140 /* process channel switch */
1141 if (sdata->vif.bss_conf.csa_active ||
1142 ieee80211_ibss_process_chanswitch(sdata, elems, true))
1143 goto put_bss;
1144
1145 /* same BSSID */
1146 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1147 goto put_bss;
1148
1149 /* we use a fixed BSSID */
1150 if (sdata->u.ibss.fixed_bssid)
1151 goto put_bss;
1152
1153 if (ieee80211_have_rx_timestamp(rx_status)) {
1154 /* time when timestamp field was received */
1155 rx_timestamp =
1156 ieee80211_calculate_rx_timestamp(local, rx_status,
1157 len + FCS_LEN, 24);
1158 } else {
1159 /*
1160 * second best option: get current TSF
1161 * (will return -1 if not supported)
1162 */
1163 rx_timestamp = drv_get_tsf(local, sdata);
1164 }
1165
1166 ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n",
1167 mgmt->sa, mgmt->bssid,
1168 (unsigned long long)rx_timestamp);
1169 ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n",
1170 (unsigned long long)beacon_timestamp,
1171 (unsigned long long)(rx_timestamp - beacon_timestamp),
1172 jiffies);
1173
1174 if (beacon_timestamp > rx_timestamp) {
1175 ibss_dbg(sdata,
1176 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1177 mgmt->bssid);
1178 ieee80211_sta_join_ibss(sdata, bss);
1179 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1180 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1181 supp_rates);
1182 rcu_read_unlock();
1183 }
1184
1185 put_bss:
1186 ieee80211_rx_bss_put(local, bss);
1187 }
1188
ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data * sdata,const u8 * bssid,const u8 * addr,u32 supp_rates)1189 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1190 const u8 *bssid, const u8 *addr,
1191 u32 supp_rates)
1192 {
1193 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1194 struct ieee80211_local *local = sdata->local;
1195 struct sta_info *sta;
1196 struct ieee80211_chanctx_conf *chanctx_conf;
1197 struct ieee80211_supported_band *sband;
1198 int band;
1199
1200 /*
1201 * XXX: Consider removing the least recently used entry and
1202 * allow new one to be added.
1203 */
1204 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1205 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1206 sdata->name, addr);
1207 return;
1208 }
1209
1210 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1211 return;
1212
1213 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1214 return;
1215
1216 rcu_read_lock();
1217 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
1218 if (WARN_ON_ONCE(!chanctx_conf)) {
1219 rcu_read_unlock();
1220 return;
1221 }
1222 band = chanctx_conf->def.chan->band;
1223 rcu_read_unlock();
1224
1225 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1226 if (!sta)
1227 return;
1228
1229 /* make sure mandatory rates are always added */
1230 sband = local->hw.wiphy->bands[band];
1231 sta->sta.deflink.supp_rates[band] = supp_rates |
1232 ieee80211_mandatory_rates(sband);
1233
1234 spin_lock(&ifibss->incomplete_lock);
1235 list_add(&sta->list, &ifibss->incomplete_stations);
1236 spin_unlock(&ifibss->incomplete_lock);
1237 wiphy_work_queue(local->hw.wiphy, &sdata->work);
1238 }
1239
ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data * sdata)1240 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1241 {
1242 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1243 struct ieee80211_local *local = sdata->local;
1244 struct sta_info *sta, *tmp;
1245 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1246 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1247
1248 mutex_lock(&local->sta_mtx);
1249
1250 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1251 unsigned long last_active = ieee80211_sta_last_active(sta);
1252
1253 if (sdata != sta->sdata)
1254 continue;
1255
1256 if (time_is_before_jiffies(last_active + exp_time) ||
1257 (time_is_before_jiffies(last_active + exp_rsn) &&
1258 sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1259 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
1260
1261 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1262 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1263 "not authorized " : "", sta->sta.addr);
1264
1265 ieee80211_send_deauth_disassoc(sdata, sta->sta.addr,
1266 ifibss->bssid,
1267 IEEE80211_STYPE_DEAUTH,
1268 WLAN_REASON_DEAUTH_LEAVING,
1269 true, frame_buf);
1270 WARN_ON(__sta_info_destroy(sta));
1271 }
1272 }
1273
1274 mutex_unlock(&local->sta_mtx);
1275 }
1276
1277 /*
1278 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1279 */
1280
ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data * sdata)1281 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1282 {
1283 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1284
1285 sdata_assert_lock(sdata);
1286
1287 mod_timer(&ifibss->timer,
1288 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1289
1290 ieee80211_ibss_sta_expire(sdata);
1291
1292 if (time_before(jiffies, ifibss->last_scan_completed +
1293 IEEE80211_IBSS_MERGE_INTERVAL))
1294 return;
1295
1296 if (ieee80211_sta_active_ibss(sdata))
1297 return;
1298
1299 if (ifibss->fixed_channel)
1300 return;
1301
1302 sdata_info(sdata,
1303 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1304
1305 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1306 NULL, 0);
1307 }
1308
ieee80211_sta_create_ibss(struct ieee80211_sub_if_data * sdata)1309 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1310 {
1311 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1312 u8 bssid[ETH_ALEN];
1313 u16 capability;
1314 int i;
1315
1316 sdata_assert_lock(sdata);
1317
1318 if (ifibss->fixed_bssid) {
1319 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1320 } else {
1321 /* Generate random, not broadcast, locally administered BSSID. Mix in
1322 * own MAC address to make sure that devices that do not have proper
1323 * random number generator get different BSSID. */
1324 get_random_bytes(bssid, ETH_ALEN);
1325 for (i = 0; i < ETH_ALEN; i++)
1326 bssid[i] ^= sdata->vif.addr[i];
1327 bssid[0] &= ~0x01;
1328 bssid[0] |= 0x02;
1329 }
1330
1331 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1332
1333 capability = WLAN_CAPABILITY_IBSS;
1334
1335 if (ifibss->privacy)
1336 capability |= WLAN_CAPABILITY_PRIVACY;
1337
1338 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1339 &ifibss->chandef, ifibss->basic_rates,
1340 capability, 0, true);
1341 }
1342
ibss_setup_channels(struct wiphy * wiphy,struct ieee80211_channel ** channels,unsigned int channels_max,u32 center_freq,u32 width)1343 static unsigned int ibss_setup_channels(struct wiphy *wiphy,
1344 struct ieee80211_channel **channels,
1345 unsigned int channels_max,
1346 u32 center_freq, u32 width)
1347 {
1348 struct ieee80211_channel *chan = NULL;
1349 unsigned int n_chan = 0;
1350 u32 start_freq, end_freq, freq;
1351
1352 if (width <= 20) {
1353 start_freq = center_freq;
1354 end_freq = center_freq;
1355 } else {
1356 start_freq = center_freq - width / 2 + 10;
1357 end_freq = center_freq + width / 2 - 10;
1358 }
1359
1360 for (freq = start_freq; freq <= end_freq; freq += 20) {
1361 chan = ieee80211_get_channel(wiphy, freq);
1362 if (!chan)
1363 continue;
1364 if (n_chan >= channels_max)
1365 return n_chan;
1366
1367 channels[n_chan] = chan;
1368 n_chan++;
1369 }
1370
1371 return n_chan;
1372 }
1373
1374 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)1375 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1376 const struct cfg80211_chan_def *chandef,
1377 struct ieee80211_channel **channels,
1378 unsigned int channels_max)
1379 {
1380 unsigned int n_chan = 0;
1381 u32 width, cf1, cf2 = 0;
1382
1383 switch (chandef->width) {
1384 case NL80211_CHAN_WIDTH_40:
1385 width = 40;
1386 break;
1387 case NL80211_CHAN_WIDTH_80P80:
1388 cf2 = chandef->center_freq2;
1389 fallthrough;
1390 case NL80211_CHAN_WIDTH_80:
1391 width = 80;
1392 break;
1393 case NL80211_CHAN_WIDTH_160:
1394 width = 160;
1395 break;
1396 default:
1397 width = 20;
1398 break;
1399 }
1400
1401 cf1 = chandef->center_freq1;
1402
1403 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1404
1405 if (cf2)
1406 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1407 channels_max - n_chan, cf2,
1408 width);
1409
1410 return n_chan;
1411 }
1412
1413 /*
1414 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1415 */
1416
ieee80211_sta_find_ibss(struct ieee80211_sub_if_data * sdata)1417 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1418 {
1419 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1420 struct ieee80211_local *local = sdata->local;
1421 struct cfg80211_bss *cbss;
1422 struct ieee80211_channel *chan = NULL;
1423 const u8 *bssid = NULL;
1424 int active_ibss;
1425
1426 sdata_assert_lock(sdata);
1427
1428 active_ibss = ieee80211_sta_active_ibss(sdata);
1429 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1430
1431 if (active_ibss)
1432 return;
1433
1434 if (ifibss->fixed_bssid)
1435 bssid = ifibss->bssid;
1436 if (ifibss->fixed_channel)
1437 chan = ifibss->chandef.chan;
1438 if (!is_zero_ether_addr(ifibss->bssid))
1439 bssid = ifibss->bssid;
1440 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1441 ifibss->ssid, ifibss->ssid_len,
1442 IEEE80211_BSS_TYPE_IBSS,
1443 IEEE80211_PRIVACY(ifibss->privacy));
1444
1445 if (cbss) {
1446 struct ieee80211_bss *bss;
1447
1448 bss = (void *)cbss->priv;
1449 ibss_dbg(sdata,
1450 "sta_find_ibss: selected %pM current %pM\n",
1451 cbss->bssid, ifibss->bssid);
1452 sdata_info(sdata,
1453 "Selected IBSS BSSID %pM based on configured SSID\n",
1454 cbss->bssid);
1455
1456 ieee80211_sta_join_ibss(sdata, bss);
1457 ieee80211_rx_bss_put(local, bss);
1458 return;
1459 }
1460
1461 /* if a fixed bssid and a fixed freq have been provided create the IBSS
1462 * directly and do not waste time scanning
1463 */
1464 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1465 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1466 bssid);
1467 ieee80211_sta_create_ibss(sdata);
1468 return;
1469 }
1470
1471
1472 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1473
1474 /* Selected IBSS not found in current scan results - try to scan */
1475 if (time_after(jiffies, ifibss->last_scan_completed +
1476 IEEE80211_SCAN_INTERVAL)) {
1477 struct ieee80211_channel *channels[8];
1478 unsigned int num;
1479
1480 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1481
1482 if (ifibss->fixed_channel) {
1483 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1484 &ifibss->chandef,
1485 channels,
1486 ARRAY_SIZE(channels));
1487 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1488 ifibss->ssid_len, channels,
1489 num);
1490 } else {
1491 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1492 ifibss->ssid_len, NULL, 0);
1493 }
1494 } else {
1495 int interval = IEEE80211_SCAN_INTERVAL;
1496
1497 if (time_after(jiffies, ifibss->ibss_join_req +
1498 IEEE80211_IBSS_JOIN_TIMEOUT))
1499 ieee80211_sta_create_ibss(sdata);
1500
1501 mod_timer(&ifibss->timer,
1502 round_jiffies(jiffies + interval));
1503 }
1504 }
1505
ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data * sdata,struct sk_buff * req)1506 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1507 struct sk_buff *req)
1508 {
1509 struct ieee80211_mgmt *mgmt = (void *)req->data;
1510 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1511 struct ieee80211_local *local = sdata->local;
1512 int tx_last_beacon, len = req->len;
1513 struct sk_buff *skb;
1514 struct beacon_data *presp;
1515 u8 *pos, *end;
1516
1517 sdata_assert_lock(sdata);
1518
1519 presp = sdata_dereference(ifibss->presp, sdata);
1520
1521 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1522 len < 24 + 2 || !presp)
1523 return;
1524
1525 tx_last_beacon = drv_tx_last_beacon(local);
1526
1527 ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
1528 ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n",
1529 mgmt->bssid, tx_last_beacon);
1530
1531 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1532 return;
1533
1534 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1535 !is_broadcast_ether_addr(mgmt->bssid))
1536 return;
1537
1538 end = ((u8 *) mgmt) + len;
1539 pos = mgmt->u.probe_req.variable;
1540 if (pos[0] != WLAN_EID_SSID ||
1541 pos + 2 + pos[1] > end) {
1542 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1543 mgmt->sa);
1544 return;
1545 }
1546 if (pos[1] != 0 &&
1547 (pos[1] != ifibss->ssid_len ||
1548 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1549 /* Ignore ProbeReq for foreign SSID */
1550 return;
1551 }
1552
1553 /* Reply with ProbeResp */
1554 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1555 if (!skb)
1556 return;
1557
1558 skb_reserve(skb, local->tx_headroom);
1559 skb_put_data(skb, presp->head, presp->head_len);
1560
1561 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1562 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1563 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1564
1565 /* avoid excessive retries for probe request to wildcard SSIDs */
1566 if (pos[1] == 0)
1567 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1568
1569 ieee80211_tx_skb(sdata, skb);
1570 }
1571
1572 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)1573 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1574 struct ieee80211_mgmt *mgmt, size_t len,
1575 struct ieee80211_rx_status *rx_status)
1576 {
1577 size_t baselen;
1578 struct ieee802_11_elems *elems;
1579
1580 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1581 offsetof(typeof(mgmt->u.beacon), variable));
1582
1583 /*
1584 * either beacon or probe_resp but the variable field is at the
1585 * same offset
1586 */
1587 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1588 if (baselen > len)
1589 return;
1590
1591 elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable,
1592 len - baselen, false, NULL);
1593
1594 if (elems) {
1595 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, elems);
1596 kfree(elems);
1597 }
1598 }
1599
ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1600 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1601 struct sk_buff *skb)
1602 {
1603 struct ieee80211_rx_status *rx_status;
1604 struct ieee80211_mgmt *mgmt;
1605 u16 fc;
1606 struct ieee802_11_elems *elems;
1607 int ies_len;
1608
1609 rx_status = IEEE80211_SKB_RXCB(skb);
1610 mgmt = (struct ieee80211_mgmt *) skb->data;
1611 fc = le16_to_cpu(mgmt->frame_control);
1612
1613 sdata_lock(sdata);
1614
1615 if (!sdata->u.ibss.ssid_len)
1616 goto mgmt_out; /* not ready to merge yet */
1617
1618 switch (fc & IEEE80211_FCTL_STYPE) {
1619 case IEEE80211_STYPE_PROBE_REQ:
1620 ieee80211_rx_mgmt_probe_req(sdata, skb);
1621 break;
1622 case IEEE80211_STYPE_PROBE_RESP:
1623 case IEEE80211_STYPE_BEACON:
1624 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1625 rx_status);
1626 break;
1627 case IEEE80211_STYPE_AUTH:
1628 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1629 break;
1630 case IEEE80211_STYPE_DEAUTH:
1631 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1632 break;
1633 case IEEE80211_STYPE_ACTION:
1634 switch (mgmt->u.action.category) {
1635 case WLAN_CATEGORY_SPECTRUM_MGMT:
1636 ies_len = skb->len -
1637 offsetof(struct ieee80211_mgmt,
1638 u.action.u.chan_switch.variable);
1639
1640 if (ies_len < 0)
1641 break;
1642
1643 elems = ieee802_11_parse_elems(
1644 mgmt->u.action.u.chan_switch.variable,
1645 ies_len, true, NULL);
1646
1647 if (elems && !elems->parse_error)
1648 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt,
1649 skb->len,
1650 rx_status,
1651 elems);
1652 kfree(elems);
1653 break;
1654 }
1655 }
1656
1657 mgmt_out:
1658 sdata_unlock(sdata);
1659 }
1660
ieee80211_ibss_work(struct ieee80211_sub_if_data * sdata)1661 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1662 {
1663 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1664 struct sta_info *sta;
1665
1666 sdata_lock(sdata);
1667
1668 /*
1669 * Work could be scheduled after scan or similar
1670 * when we aren't even joined (or trying) with a
1671 * network.
1672 */
1673 if (!ifibss->ssid_len)
1674 goto out;
1675
1676 spin_lock_bh(&ifibss->incomplete_lock);
1677 while (!list_empty(&ifibss->incomplete_stations)) {
1678 sta = list_first_entry(&ifibss->incomplete_stations,
1679 struct sta_info, list);
1680 list_del(&sta->list);
1681 spin_unlock_bh(&ifibss->incomplete_lock);
1682
1683 ieee80211_ibss_finish_sta(sta);
1684 rcu_read_unlock();
1685 spin_lock_bh(&ifibss->incomplete_lock);
1686 }
1687 spin_unlock_bh(&ifibss->incomplete_lock);
1688
1689 switch (ifibss->state) {
1690 case IEEE80211_IBSS_MLME_SEARCH:
1691 ieee80211_sta_find_ibss(sdata);
1692 break;
1693 case IEEE80211_IBSS_MLME_JOINED:
1694 ieee80211_sta_merge_ibss(sdata);
1695 break;
1696 default:
1697 WARN_ON(1);
1698 break;
1699 }
1700
1701 out:
1702 sdata_unlock(sdata);
1703 }
1704
ieee80211_ibss_timer(struct timer_list * t)1705 static void ieee80211_ibss_timer(struct timer_list *t)
1706 {
1707 struct ieee80211_sub_if_data *sdata =
1708 from_timer(sdata, t, u.ibss.timer);
1709
1710 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
1711 }
1712
ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data * sdata)1713 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1714 {
1715 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1716
1717 timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0);
1718 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1719 spin_lock_init(&ifibss->incomplete_lock);
1720 wiphy_work_init(&ifibss->csa_connection_drop_work,
1721 ieee80211_csa_connection_drop_work);
1722 }
1723
1724 /* scan finished notification */
ieee80211_ibss_notify_scan_completed(struct ieee80211_local * local)1725 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1726 {
1727 struct ieee80211_sub_if_data *sdata;
1728
1729 mutex_lock(&local->iflist_mtx);
1730 list_for_each_entry(sdata, &local->interfaces, list) {
1731 if (!ieee80211_sdata_running(sdata))
1732 continue;
1733 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1734 continue;
1735 sdata->u.ibss.last_scan_completed = jiffies;
1736 }
1737 mutex_unlock(&local->iflist_mtx);
1738 }
1739
ieee80211_ibss_join(struct ieee80211_sub_if_data * sdata,struct cfg80211_ibss_params * params)1740 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1741 struct cfg80211_ibss_params *params)
1742 {
1743 u64 changed = 0;
1744 u32 rate_flags;
1745 struct ieee80211_supported_band *sband;
1746 enum ieee80211_chanctx_mode chanmode;
1747 struct ieee80211_local *local = sdata->local;
1748 int radar_detect_width = 0;
1749 int i;
1750 int ret;
1751
1752 if (params->chandef.chan->freq_offset) {
1753 /* this may work, but is untested */
1754 return -EOPNOTSUPP;
1755 }
1756
1757 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1758 ¶ms->chandef,
1759 sdata->wdev.iftype);
1760 if (ret < 0)
1761 return ret;
1762
1763 if (ret > 0) {
1764 if (!params->userspace_handles_dfs)
1765 return -EINVAL;
1766 radar_detect_width = BIT(params->chandef.width);
1767 }
1768
1769 chanmode = (params->channel_fixed && !ret) ?
1770 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1771
1772 mutex_lock(&local->chanctx_mtx);
1773 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode,
1774 radar_detect_width);
1775 mutex_unlock(&local->chanctx_mtx);
1776 if (ret < 0)
1777 return ret;
1778
1779 if (params->bssid) {
1780 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1781 sdata->u.ibss.fixed_bssid = true;
1782 } else
1783 sdata->u.ibss.fixed_bssid = false;
1784
1785 sdata->u.ibss.privacy = params->privacy;
1786 sdata->u.ibss.control_port = params->control_port;
1787 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1788 sdata->u.ibss.basic_rates = params->basic_rates;
1789 sdata->u.ibss.last_scan_completed = jiffies;
1790
1791 /* fix basic_rates if channel does not support these rates */
1792 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef);
1793 sband = local->hw.wiphy->bands[params->chandef.chan->band];
1794 for (i = 0; i < sband->n_bitrates; i++) {
1795 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1796 sdata->u.ibss.basic_rates &= ~BIT(i);
1797 }
1798 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1799 sizeof(params->mcast_rate));
1800
1801 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1802
1803 sdata->u.ibss.chandef = params->chandef;
1804 sdata->u.ibss.fixed_channel = params->channel_fixed;
1805
1806 if (params->ie) {
1807 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1808 GFP_KERNEL);
1809 if (sdata->u.ibss.ie)
1810 sdata->u.ibss.ie_len = params->ie_len;
1811 }
1812
1813 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1814 sdata->u.ibss.ibss_join_req = jiffies;
1815
1816 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1817 sdata->u.ibss.ssid_len = params->ssid_len;
1818
1819 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa,
1820 sizeof(sdata->u.ibss.ht_capa));
1821 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask,
1822 sizeof(sdata->u.ibss.ht_capa_mask));
1823
1824 /*
1825 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1826 * reserved, but an HT STA shall protect HT transmissions as though
1827 * the HT Protection field were set to non-HT mixed mode.
1828 *
1829 * In an IBSS, the RIFS Mode field of the HT Operation element is
1830 * also reserved, but an HT STA shall operate as though this field
1831 * were set to 1.
1832 */
1833
1834 sdata->vif.bss_conf.ht_operation_mode |=
1835 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1836 | IEEE80211_HT_PARAM_RIFS_MODE;
1837
1838 changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE;
1839 ieee80211_link_info_change_notify(sdata, &sdata->deflink, changed);
1840
1841 sdata->deflink.smps_mode = IEEE80211_SMPS_OFF;
1842 sdata->deflink.needed_rx_chains = local->rx_chains;
1843 sdata->control_port_over_nl80211 = params->control_port_over_nl80211;
1844
1845 wiphy_work_queue(local->hw.wiphy, &sdata->work);
1846
1847 return 0;
1848 }
1849
ieee80211_ibss_leave(struct ieee80211_sub_if_data * sdata)1850 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1851 {
1852 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1853
1854 ieee80211_ibss_disconnect(sdata);
1855 ifibss->ssid_len = 0;
1856 eth_zero_addr(ifibss->bssid);
1857
1858 /* remove beacon */
1859 kfree(sdata->u.ibss.ie);
1860 sdata->u.ibss.ie = NULL;
1861 sdata->u.ibss.ie_len = 0;
1862
1863 /* on the next join, re-program HT parameters */
1864 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1865 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1866
1867 synchronize_rcu();
1868
1869 skb_queue_purge(&sdata->skb_queue);
1870
1871 del_timer_sync(&sdata->u.ibss.timer);
1872
1873 return 0;
1874 }
1875