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) 2018-2022 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.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_meta.scan_width = cfg80211_chandef_to_scan_width(&chandef);
386 bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt,
387 presp->head_len, GFP_KERNEL);
388
389 cfg80211_put_bss(local->hw.wiphy, bss);
390 netif_carrier_on(sdata->dev);
391 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
392 }
393
ieee80211_sta_join_ibss(struct ieee80211_sub_if_data * sdata,struct ieee80211_bss * bss)394 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
395 struct ieee80211_bss *bss)
396 {
397 struct cfg80211_bss *cbss =
398 container_of((void *)bss, struct cfg80211_bss, priv);
399 struct ieee80211_supported_band *sband;
400 struct cfg80211_chan_def chandef;
401 u32 basic_rates;
402 int i, j;
403 u16 beacon_int = cbss->beacon_interval;
404 const struct cfg80211_bss_ies *ies;
405 enum nl80211_channel_type chan_type;
406 u64 tsf;
407 u32 rate_flags;
408 int shift;
409
410 sdata_assert_lock(sdata);
411
412 if (beacon_int < 10)
413 beacon_int = 10;
414
415 switch (sdata->u.ibss.chandef.width) {
416 case NL80211_CHAN_WIDTH_20_NOHT:
417 case NL80211_CHAN_WIDTH_20:
418 case NL80211_CHAN_WIDTH_40:
419 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
420 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
421 break;
422 case NL80211_CHAN_WIDTH_5:
423 case NL80211_CHAN_WIDTH_10:
424 cfg80211_chandef_create(&chandef, cbss->channel,
425 NL80211_CHAN_NO_HT);
426 chandef.width = sdata->u.ibss.chandef.width;
427 break;
428 case NL80211_CHAN_WIDTH_80:
429 case NL80211_CHAN_WIDTH_80P80:
430 case NL80211_CHAN_WIDTH_160:
431 chandef = sdata->u.ibss.chandef;
432 chandef.chan = cbss->channel;
433 break;
434 default:
435 /* fall back to 20 MHz for unsupported modes */
436 cfg80211_chandef_create(&chandef, cbss->channel,
437 NL80211_CHAN_NO_HT);
438 break;
439 }
440
441 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
442 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
443 shift = ieee80211_vif_get_shift(&sdata->vif);
444
445 basic_rates = 0;
446
447 for (i = 0; i < bss->supp_rates_len; i++) {
448 int rate = bss->supp_rates[i] & 0x7f;
449 bool is_basic = !!(bss->supp_rates[i] & 0x80);
450
451 for (j = 0; j < sband->n_bitrates; j++) {
452 int brate;
453 if ((rate_flags & sband->bitrates[j].flags)
454 != rate_flags)
455 continue;
456
457 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
458 5 * (1 << shift));
459 if (brate == rate) {
460 if (is_basic)
461 basic_rates |= BIT(j);
462 break;
463 }
464 }
465 }
466
467 rcu_read_lock();
468 ies = rcu_dereference(cbss->ies);
469 tsf = ies->tsf;
470 rcu_read_unlock();
471
472 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
473 beacon_int,
474 &chandef,
475 basic_rates,
476 cbss->capability,
477 tsf, false);
478 }
479
ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data * sdata,struct cfg80211_csa_settings * csa_settings)480 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
481 struct cfg80211_csa_settings *csa_settings)
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 return BSS_CHANGED_BEACON;
524 }
525
ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data * sdata)526 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
527 {
528 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
529 struct cfg80211_bss *cbss;
530
531 sdata_assert_lock(sdata);
532
533 /* When not connected/joined, sending CSA doesn't make sense. */
534 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED)
535 return -ENOLINK;
536
537 /* update cfg80211 bss information with the new channel */
538 if (!is_zero_ether_addr(ifibss->bssid)) {
539 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
540 ifibss->chandef.chan,
541 ifibss->bssid, ifibss->ssid,
542 ifibss->ssid_len,
543 IEEE80211_BSS_TYPE_IBSS,
544 IEEE80211_PRIVACY(ifibss->privacy));
545 /* XXX: should not really modify cfg80211 data */
546 if (cbss) {
547 cbss->channel = sdata->deflink.csa_chandef.chan;
548 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
549 }
550 }
551
552 ifibss->chandef = sdata->deflink.csa_chandef;
553
554 /* generate the beacon */
555 return ieee80211_ibss_csa_beacon(sdata, NULL);
556 }
557
ieee80211_ibss_stop(struct ieee80211_sub_if_data * sdata)558 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
559 {
560 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
561
562 cancel_work_sync(&ifibss->csa_connection_drop_work);
563 }
564
ieee80211_ibss_finish_sta(struct sta_info * sta)565 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
566 __acquires(RCU)
567 {
568 struct ieee80211_sub_if_data *sdata = sta->sdata;
569 u8 addr[ETH_ALEN];
570
571 memcpy(addr, sta->sta.addr, ETH_ALEN);
572
573 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
574
575 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
576 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
577 /* authorize the station only if the network is not RSN protected. If
578 * not wait for the userspace to authorize it */
579 if (!sta->sdata->u.ibss.control_port)
580 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
581
582 rate_control_rate_init(sta);
583
584 /* If it fails, maybe we raced another insertion? */
585 if (sta_info_insert_rcu(sta))
586 return sta_info_get(sdata, addr);
587 return sta;
588 }
589
590 static struct sta_info *
ieee80211_ibss_add_sta(struct ieee80211_sub_if_data * sdata,const u8 * bssid,const u8 * addr,u32 supp_rates)591 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
592 const u8 *addr, u32 supp_rates)
593 __acquires(RCU)
594 {
595 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
596 struct ieee80211_local *local = sdata->local;
597 struct sta_info *sta;
598 struct ieee80211_chanctx_conf *chanctx_conf;
599 struct ieee80211_supported_band *sband;
600 enum nl80211_bss_scan_width scan_width;
601 int band;
602
603 /*
604 * XXX: Consider removing the least recently used entry and
605 * allow new one to be added.
606 */
607 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
608 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
609 sdata->name, addr);
610 rcu_read_lock();
611 return NULL;
612 }
613
614 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
615 rcu_read_lock();
616 return NULL;
617 }
618
619 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
620 rcu_read_lock();
621 return NULL;
622 }
623
624 rcu_read_lock();
625 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
626 if (WARN_ON_ONCE(!chanctx_conf))
627 return NULL;
628 band = chanctx_conf->def.chan->band;
629 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
630 rcu_read_unlock();
631
632 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
633 if (!sta) {
634 rcu_read_lock();
635 return NULL;
636 }
637
638 /* 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, scan_width);
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 work_struct * work)731 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
732 {
733 struct ieee80211_sub_if_data *sdata =
734 container_of(work, struct ieee80211_sub_if_data,
735 u.ibss.csa_connection_drop_work);
736
737 sdata_lock(sdata);
738
739 ieee80211_ibss_disconnect(sdata);
740 synchronize_rcu();
741 skb_queue_purge(&sdata->skb_queue);
742
743 /* trigger a scan to find another IBSS network to join */
744 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
745
746 sdata_unlock(sdata);
747 }
748
ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data * sdata)749 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
750 {
751 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
752 int err;
753
754 /* if the current channel is a DFS channel, mark the channel as
755 * unavailable.
756 */
757 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
758 &ifibss->chandef,
759 NL80211_IFTYPE_ADHOC);
760 if (err > 0)
761 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
762 GFP_ATOMIC);
763 }
764
765 static bool
ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data * sdata,struct ieee802_11_elems * elems,bool beacon)766 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
767 struct ieee802_11_elems *elems,
768 bool beacon)
769 {
770 struct cfg80211_csa_settings params;
771 struct ieee80211_csa_ie csa_ie;
772 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
773 enum nl80211_channel_type ch_type;
774 int err;
775 ieee80211_conn_flags_t conn_flags;
776 u32 vht_cap_info = 0;
777
778 sdata_assert_lock(sdata);
779
780 conn_flags = IEEE80211_CONN_DISABLE_VHT;
781
782 switch (ifibss->chandef.width) {
783 case NL80211_CHAN_WIDTH_5:
784 case NL80211_CHAN_WIDTH_10:
785 case NL80211_CHAN_WIDTH_20_NOHT:
786 conn_flags |= IEEE80211_CONN_DISABLE_HT;
787 fallthrough;
788 case NL80211_CHAN_WIDTH_20:
789 conn_flags |= IEEE80211_CONN_DISABLE_40MHZ;
790 break;
791 default:
792 break;
793 }
794
795 if (elems->vht_cap_elem)
796 vht_cap_info = le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
797
798 memset(¶ms, 0, sizeof(params));
799 err = ieee80211_parse_ch_switch_ie(sdata, elems,
800 ifibss->chandef.chan->band,
801 vht_cap_info,
802 conn_flags, ifibss->bssid, &csa_ie);
803 /* can't switch to destination channel, fail */
804 if (err < 0)
805 goto disconnect;
806
807 /* did not contain a CSA */
808 if (err)
809 return false;
810
811 /* channel switch is not supported, disconnect */
812 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
813 goto disconnect;
814
815 params.count = csa_ie.count;
816 params.chandef = csa_ie.chandef;
817
818 switch (ifibss->chandef.width) {
819 case NL80211_CHAN_WIDTH_20_NOHT:
820 case NL80211_CHAN_WIDTH_20:
821 case NL80211_CHAN_WIDTH_40:
822 /* keep our current HT mode (HT20/HT40+/HT40-), even if
823 * another mode has been announced. The mode is not adopted
824 * within the beacon while doing CSA and we should therefore
825 * keep the mode which we announce.
826 */
827 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
828 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan,
829 ch_type);
830 break;
831 case NL80211_CHAN_WIDTH_5:
832 case NL80211_CHAN_WIDTH_10:
833 if (params.chandef.width != ifibss->chandef.width) {
834 sdata_info(sdata,
835 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
836 ifibss->bssid,
837 params.chandef.chan->center_freq,
838 params.chandef.width,
839 params.chandef.center_freq1,
840 params.chandef.center_freq2);
841 goto disconnect;
842 }
843 break;
844 default:
845 /* should not happen, conn_flags should prevent VHT modes. */
846 WARN_ON(1);
847 goto disconnect;
848 }
849
850 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef,
851 NL80211_IFTYPE_ADHOC)) {
852 sdata_info(sdata,
853 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
854 ifibss->bssid,
855 params.chandef.chan->center_freq,
856 params.chandef.width,
857 params.chandef.center_freq1,
858 params.chandef.center_freq2);
859 goto disconnect;
860 }
861
862 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
863 ¶ms.chandef,
864 NL80211_IFTYPE_ADHOC);
865 if (err < 0)
866 goto disconnect;
867 if (err > 0 && !ifibss->userspace_handles_dfs) {
868 /* IBSS-DFS only allowed with a control program */
869 goto disconnect;
870 }
871
872 params.radar_required = err;
873
874 if (cfg80211_chandef_identical(¶ms.chandef,
875 &sdata->vif.bss_conf.chandef)) {
876 ibss_dbg(sdata,
877 "received csa with an identical chandef, ignoring\n");
878 return true;
879 }
880
881 /* all checks done, now perform the channel switch. */
882 ibss_dbg(sdata,
883 "received channel switch announcement to go to channel %d MHz\n",
884 params.chandef.chan->center_freq);
885
886 params.block_tx = !!csa_ie.mode;
887
888 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
889 ¶ms))
890 goto disconnect;
891
892 ieee80211_ibss_csa_mark_radar(sdata);
893
894 return true;
895 disconnect:
896 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
897 ieee80211_queue_work(&sdata->local->hw,
898 &ifibss->csa_connection_drop_work);
899
900 ieee80211_ibss_csa_mark_radar(sdata);
901
902 return true;
903 }
904
905 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)906 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
907 struct ieee80211_mgmt *mgmt, size_t len,
908 struct ieee80211_rx_status *rx_status,
909 struct ieee802_11_elems *elems)
910 {
911 int required_len;
912
913 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
914 return;
915
916 /* CSA is the only action we handle for now */
917 if (mgmt->u.action.u.measurement.action_code !=
918 WLAN_ACTION_SPCT_CHL_SWITCH)
919 return;
920
921 required_len = IEEE80211_MIN_ACTION_SIZE +
922 sizeof(mgmt->u.action.u.chan_switch);
923 if (len < required_len)
924 return;
925
926 if (!sdata->vif.bss_conf.csa_active)
927 ieee80211_ibss_process_chanswitch(sdata, elems, false);
928 }
929
ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)930 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
931 struct ieee80211_mgmt *mgmt,
932 size_t len)
933 {
934 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
935
936 if (len < IEEE80211_DEAUTH_FRAME_LEN)
937 return;
938
939 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
940 ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason);
941 sta_info_destroy_addr(sdata, mgmt->sa);
942 }
943
ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)944 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
945 struct ieee80211_mgmt *mgmt,
946 size_t len)
947 {
948 u16 auth_alg, auth_transaction;
949
950 sdata_assert_lock(sdata);
951
952 if (len < 24 + 6)
953 return;
954
955 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
956 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
957
958 ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
959 ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n",
960 mgmt->bssid, auth_transaction);
961
962 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
963 return;
964
965 /*
966 * IEEE 802.11 standard does not require authentication in IBSS
967 * networks and most implementations do not seem to use it.
968 * However, try to reply to authentication attempts if someone
969 * has actually implemented this.
970 */
971 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
972 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
973 }
974
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)975 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
976 struct ieee80211_mgmt *mgmt, size_t len,
977 struct ieee80211_rx_status *rx_status,
978 struct ieee802_11_elems *elems,
979 struct ieee80211_channel *channel)
980 {
981 struct sta_info *sta;
982 enum nl80211_band band = rx_status->band;
983 enum nl80211_bss_scan_width scan_width;
984 struct ieee80211_local *local = sdata->local;
985 struct ieee80211_supported_band *sband;
986 bool rates_updated = false;
987 u32 supp_rates = 0;
988
989 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
990 return;
991
992 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
993 return;
994
995 sband = local->hw.wiphy->bands[band];
996 if (WARN_ON(!sband))
997 return;
998
999 rcu_read_lock();
1000 sta = sta_info_get(sdata, mgmt->sa);
1001
1002 if (elems->supp_rates) {
1003 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1004 band, NULL);
1005 if (sta) {
1006 u32 prev_rates;
1007
1008 prev_rates = sta->sta.deflink.supp_rates[band];
1009 /* make sure mandatory rates are always added */
1010 scan_width = NL80211_BSS_CHAN_WIDTH_20;
1011 if (rx_status->bw == RATE_INFO_BW_5)
1012 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1013 else if (rx_status->bw == RATE_INFO_BW_10)
1014 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1015
1016 sta->sta.deflink.supp_rates[band] = supp_rates |
1017 ieee80211_mandatory_rates(sband, scan_width);
1018 if (sta->sta.deflink.supp_rates[band] != prev_rates) {
1019 ibss_dbg(sdata,
1020 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1021 sta->sta.addr, prev_rates,
1022 sta->sta.deflink.supp_rates[band]);
1023 rates_updated = true;
1024 }
1025 } else {
1026 rcu_read_unlock();
1027 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1028 mgmt->sa, supp_rates);
1029 }
1030 }
1031
1032 if (sta && !sta->sta.wme &&
1033 (elems->wmm_info || elems->s1g_capab) &&
1034 local->hw.queues >= IEEE80211_NUM_ACS) {
1035 sta->sta.wme = true;
1036 ieee80211_check_fast_xmit(sta);
1037 }
1038
1039 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1040 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1041 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1042 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1043 /* we both use HT */
1044 struct ieee80211_ht_cap htcap_ie;
1045 struct cfg80211_chan_def chandef;
1046 enum ieee80211_sta_rx_bandwidth bw = sta->sta.deflink.bandwidth;
1047
1048 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT);
1049 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef);
1050
1051 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1052 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1053 &htcap_ie,
1054 &sta->deflink);
1055
1056 if (elems->vht_operation && elems->vht_cap_elem &&
1057 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1058 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1059 /* we both use VHT */
1060 struct ieee80211_vht_cap cap_ie;
1061 struct ieee80211_sta_vht_cap cap = sta->sta.deflink.vht_cap;
1062 u32 vht_cap_info =
1063 le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
1064
1065 ieee80211_chandef_vht_oper(&local->hw, vht_cap_info,
1066 elems->vht_operation,
1067 elems->ht_operation,
1068 &chandef);
1069 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1070 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1071 &cap_ie,
1072 &sta->deflink);
1073 if (memcmp(&cap, &sta->sta.deflink.vht_cap, sizeof(cap)))
1074 rates_updated |= true;
1075 }
1076
1077 if (bw != sta->sta.deflink.bandwidth)
1078 rates_updated |= true;
1079
1080 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1081 &chandef))
1082 WARN_ON_ONCE(1);
1083 }
1084
1085 if (sta && rates_updated) {
1086 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1087 u8 rx_nss = sta->sta.deflink.rx_nss;
1088
1089 /* Force rx_nss recalculation */
1090 sta->sta.deflink.rx_nss = 0;
1091 rate_control_rate_init(sta);
1092 if (sta->sta.deflink.rx_nss != rx_nss)
1093 changed |= IEEE80211_RC_NSS_CHANGED;
1094
1095 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1096 }
1097
1098 rcu_read_unlock();
1099 }
1100
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)1101 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1102 struct ieee80211_mgmt *mgmt, size_t len,
1103 struct ieee80211_rx_status *rx_status,
1104 struct ieee802_11_elems *elems)
1105 {
1106 struct ieee80211_local *local = sdata->local;
1107 struct cfg80211_bss *cbss;
1108 struct ieee80211_bss *bss;
1109 struct ieee80211_channel *channel;
1110 u64 beacon_timestamp, rx_timestamp;
1111 u32 supp_rates = 0;
1112 enum nl80211_band band = rx_status->band;
1113
1114 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1115 if (!channel)
1116 return;
1117
1118 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1119
1120 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel);
1121 if (!bss)
1122 return;
1123
1124 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1125
1126 /* same for beacon and probe response */
1127 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1128
1129 /* check if we need to merge IBSS */
1130
1131 /* not an IBSS */
1132 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1133 goto put_bss;
1134
1135 /* different channel */
1136 if (sdata->u.ibss.fixed_channel &&
1137 sdata->u.ibss.chandef.chan != cbss->channel)
1138 goto put_bss;
1139
1140 /* different SSID */
1141 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1142 memcmp(elems->ssid, sdata->u.ibss.ssid,
1143 sdata->u.ibss.ssid_len))
1144 goto put_bss;
1145
1146 /* process channel switch */
1147 if (sdata->vif.bss_conf.csa_active ||
1148 ieee80211_ibss_process_chanswitch(sdata, elems, true))
1149 goto put_bss;
1150
1151 /* same BSSID */
1152 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1153 goto put_bss;
1154
1155 /* we use a fixed BSSID */
1156 if (sdata->u.ibss.fixed_bssid)
1157 goto put_bss;
1158
1159 if (ieee80211_have_rx_timestamp(rx_status)) {
1160 /* time when timestamp field was received */
1161 rx_timestamp =
1162 ieee80211_calculate_rx_timestamp(local, rx_status,
1163 len + FCS_LEN, 24);
1164 } else {
1165 /*
1166 * second best option: get current TSF
1167 * (will return -1 if not supported)
1168 */
1169 rx_timestamp = drv_get_tsf(local, sdata);
1170 }
1171
1172 ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n",
1173 mgmt->sa, mgmt->bssid,
1174 (unsigned long long)rx_timestamp);
1175 ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n",
1176 (unsigned long long)beacon_timestamp,
1177 (unsigned long long)(rx_timestamp - beacon_timestamp),
1178 jiffies);
1179
1180 if (beacon_timestamp > rx_timestamp) {
1181 ibss_dbg(sdata,
1182 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1183 mgmt->bssid);
1184 ieee80211_sta_join_ibss(sdata, bss);
1185 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1186 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1187 supp_rates);
1188 rcu_read_unlock();
1189 }
1190
1191 put_bss:
1192 ieee80211_rx_bss_put(local, bss);
1193 }
1194
ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data * sdata,const u8 * bssid,const u8 * addr,u32 supp_rates)1195 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1196 const u8 *bssid, const u8 *addr,
1197 u32 supp_rates)
1198 {
1199 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1200 struct ieee80211_local *local = sdata->local;
1201 struct sta_info *sta;
1202 struct ieee80211_chanctx_conf *chanctx_conf;
1203 struct ieee80211_supported_band *sband;
1204 enum nl80211_bss_scan_width scan_width;
1205 int band;
1206
1207 /*
1208 * XXX: Consider removing the least recently used entry and
1209 * allow new one to be added.
1210 */
1211 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1212 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1213 sdata->name, addr);
1214 return;
1215 }
1216
1217 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1218 return;
1219
1220 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1221 return;
1222
1223 rcu_read_lock();
1224 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
1225 if (WARN_ON_ONCE(!chanctx_conf)) {
1226 rcu_read_unlock();
1227 return;
1228 }
1229 band = chanctx_conf->def.chan->band;
1230 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1231 rcu_read_unlock();
1232
1233 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1234 if (!sta)
1235 return;
1236
1237 /* make sure mandatory rates are always added */
1238 sband = local->hw.wiphy->bands[band];
1239 sta->sta.deflink.supp_rates[band] = supp_rates |
1240 ieee80211_mandatory_rates(sband, scan_width);
1241
1242 spin_lock(&ifibss->incomplete_lock);
1243 list_add(&sta->list, &ifibss->incomplete_stations);
1244 spin_unlock(&ifibss->incomplete_lock);
1245 ieee80211_queue_work(&local->hw, &sdata->work);
1246 }
1247
ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data * sdata)1248 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1249 {
1250 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1251 struct ieee80211_local *local = sdata->local;
1252 struct sta_info *sta, *tmp;
1253 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1254 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1255
1256 mutex_lock(&local->sta_mtx);
1257
1258 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1259 unsigned long last_active = ieee80211_sta_last_active(sta);
1260
1261 if (sdata != sta->sdata)
1262 continue;
1263
1264 if (time_is_before_jiffies(last_active + exp_time) ||
1265 (time_is_before_jiffies(last_active + exp_rsn) &&
1266 sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1267 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
1268
1269 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1270 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1271 "not authorized " : "", sta->sta.addr);
1272
1273 ieee80211_send_deauth_disassoc(sdata, sta->sta.addr,
1274 ifibss->bssid,
1275 IEEE80211_STYPE_DEAUTH,
1276 WLAN_REASON_DEAUTH_LEAVING,
1277 true, frame_buf);
1278 WARN_ON(__sta_info_destroy(sta));
1279 }
1280 }
1281
1282 mutex_unlock(&local->sta_mtx);
1283 }
1284
1285 /*
1286 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1287 */
1288
ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data * sdata)1289 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1290 {
1291 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1292 enum nl80211_bss_scan_width scan_width;
1293
1294 sdata_assert_lock(sdata);
1295
1296 mod_timer(&ifibss->timer,
1297 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1298
1299 ieee80211_ibss_sta_expire(sdata);
1300
1301 if (time_before(jiffies, ifibss->last_scan_completed +
1302 IEEE80211_IBSS_MERGE_INTERVAL))
1303 return;
1304
1305 if (ieee80211_sta_active_ibss(sdata))
1306 return;
1307
1308 if (ifibss->fixed_channel)
1309 return;
1310
1311 sdata_info(sdata,
1312 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1313
1314 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1315 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1316 NULL, 0, scan_width);
1317 }
1318
ieee80211_sta_create_ibss(struct ieee80211_sub_if_data * sdata)1319 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1320 {
1321 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1322 u8 bssid[ETH_ALEN];
1323 u16 capability;
1324 int i;
1325
1326 sdata_assert_lock(sdata);
1327
1328 if (ifibss->fixed_bssid) {
1329 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1330 } else {
1331 /* Generate random, not broadcast, locally administered BSSID. Mix in
1332 * own MAC address to make sure that devices that do not have proper
1333 * random number generator get different BSSID. */
1334 get_random_bytes(bssid, ETH_ALEN);
1335 for (i = 0; i < ETH_ALEN; i++)
1336 bssid[i] ^= sdata->vif.addr[i];
1337 bssid[0] &= ~0x01;
1338 bssid[0] |= 0x02;
1339 }
1340
1341 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1342
1343 capability = WLAN_CAPABILITY_IBSS;
1344
1345 if (ifibss->privacy)
1346 capability |= WLAN_CAPABILITY_PRIVACY;
1347
1348 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1349 &ifibss->chandef, ifibss->basic_rates,
1350 capability, 0, true);
1351 }
1352
ibss_setup_channels(struct wiphy * wiphy,struct ieee80211_channel ** channels,unsigned int channels_max,u32 center_freq,u32 width)1353 static unsigned int ibss_setup_channels(struct wiphy *wiphy,
1354 struct ieee80211_channel **channels,
1355 unsigned int channels_max,
1356 u32 center_freq, u32 width)
1357 {
1358 struct ieee80211_channel *chan = NULL;
1359 unsigned int n_chan = 0;
1360 u32 start_freq, end_freq, freq;
1361
1362 if (width <= 20) {
1363 start_freq = center_freq;
1364 end_freq = center_freq;
1365 } else {
1366 start_freq = center_freq - width / 2 + 10;
1367 end_freq = center_freq + width / 2 - 10;
1368 }
1369
1370 for (freq = start_freq; freq <= end_freq; freq += 20) {
1371 chan = ieee80211_get_channel(wiphy, freq);
1372 if (!chan)
1373 continue;
1374 if (n_chan >= channels_max)
1375 return n_chan;
1376
1377 channels[n_chan] = chan;
1378 n_chan++;
1379 }
1380
1381 return n_chan;
1382 }
1383
1384 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)1385 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1386 const struct cfg80211_chan_def *chandef,
1387 struct ieee80211_channel **channels,
1388 unsigned int channels_max)
1389 {
1390 unsigned int n_chan = 0;
1391 u32 width, cf1, cf2 = 0;
1392
1393 switch (chandef->width) {
1394 case NL80211_CHAN_WIDTH_40:
1395 width = 40;
1396 break;
1397 case NL80211_CHAN_WIDTH_80P80:
1398 cf2 = chandef->center_freq2;
1399 fallthrough;
1400 case NL80211_CHAN_WIDTH_80:
1401 width = 80;
1402 break;
1403 case NL80211_CHAN_WIDTH_160:
1404 width = 160;
1405 break;
1406 default:
1407 width = 20;
1408 break;
1409 }
1410
1411 cf1 = chandef->center_freq1;
1412
1413 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1414
1415 if (cf2)
1416 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1417 channels_max - n_chan, cf2,
1418 width);
1419
1420 return n_chan;
1421 }
1422
1423 /*
1424 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1425 */
1426
ieee80211_sta_find_ibss(struct ieee80211_sub_if_data * sdata)1427 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1428 {
1429 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1430 struct ieee80211_local *local = sdata->local;
1431 struct cfg80211_bss *cbss;
1432 struct ieee80211_channel *chan = NULL;
1433 const u8 *bssid = NULL;
1434 enum nl80211_bss_scan_width scan_width;
1435 int active_ibss;
1436
1437 sdata_assert_lock(sdata);
1438
1439 active_ibss = ieee80211_sta_active_ibss(sdata);
1440 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1441
1442 if (active_ibss)
1443 return;
1444
1445 if (ifibss->fixed_bssid)
1446 bssid = ifibss->bssid;
1447 if (ifibss->fixed_channel)
1448 chan = ifibss->chandef.chan;
1449 if (!is_zero_ether_addr(ifibss->bssid))
1450 bssid = ifibss->bssid;
1451 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1452 ifibss->ssid, ifibss->ssid_len,
1453 IEEE80211_BSS_TYPE_IBSS,
1454 IEEE80211_PRIVACY(ifibss->privacy));
1455
1456 if (cbss) {
1457 struct ieee80211_bss *bss;
1458
1459 bss = (void *)cbss->priv;
1460 ibss_dbg(sdata,
1461 "sta_find_ibss: selected %pM current %pM\n",
1462 cbss->bssid, ifibss->bssid);
1463 sdata_info(sdata,
1464 "Selected IBSS BSSID %pM based on configured SSID\n",
1465 cbss->bssid);
1466
1467 ieee80211_sta_join_ibss(sdata, bss);
1468 ieee80211_rx_bss_put(local, bss);
1469 return;
1470 }
1471
1472 /* if a fixed bssid and a fixed freq have been provided create the IBSS
1473 * directly and do not waste time scanning
1474 */
1475 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1476 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1477 bssid);
1478 ieee80211_sta_create_ibss(sdata);
1479 return;
1480 }
1481
1482
1483 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1484
1485 /* Selected IBSS not found in current scan results - try to scan */
1486 if (time_after(jiffies, ifibss->last_scan_completed +
1487 IEEE80211_SCAN_INTERVAL)) {
1488 struct ieee80211_channel *channels[8];
1489 unsigned int num;
1490
1491 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1492
1493 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1494
1495 if (ifibss->fixed_channel) {
1496 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1497 &ifibss->chandef,
1498 channels,
1499 ARRAY_SIZE(channels));
1500 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1501 ifibss->ssid_len, channels,
1502 num, scan_width);
1503 } else {
1504 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1505 ifibss->ssid_len, NULL,
1506 0, scan_width);
1507 }
1508 } else {
1509 int interval = IEEE80211_SCAN_INTERVAL;
1510
1511 if (time_after(jiffies, ifibss->ibss_join_req +
1512 IEEE80211_IBSS_JOIN_TIMEOUT))
1513 ieee80211_sta_create_ibss(sdata);
1514
1515 mod_timer(&ifibss->timer,
1516 round_jiffies(jiffies + interval));
1517 }
1518 }
1519
ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data * sdata,struct sk_buff * req)1520 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1521 struct sk_buff *req)
1522 {
1523 struct ieee80211_mgmt *mgmt = (void *)req->data;
1524 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1525 struct ieee80211_local *local = sdata->local;
1526 int tx_last_beacon, len = req->len;
1527 struct sk_buff *skb;
1528 struct beacon_data *presp;
1529 u8 *pos, *end;
1530
1531 sdata_assert_lock(sdata);
1532
1533 presp = sdata_dereference(ifibss->presp, sdata);
1534
1535 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1536 len < 24 + 2 || !presp)
1537 return;
1538
1539 tx_last_beacon = drv_tx_last_beacon(local);
1540
1541 ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
1542 ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n",
1543 mgmt->bssid, tx_last_beacon);
1544
1545 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1546 return;
1547
1548 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1549 !is_broadcast_ether_addr(mgmt->bssid))
1550 return;
1551
1552 end = ((u8 *) mgmt) + len;
1553 pos = mgmt->u.probe_req.variable;
1554 if (pos[0] != WLAN_EID_SSID ||
1555 pos + 2 + pos[1] > end) {
1556 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1557 mgmt->sa);
1558 return;
1559 }
1560 if (pos[1] != 0 &&
1561 (pos[1] != ifibss->ssid_len ||
1562 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1563 /* Ignore ProbeReq for foreign SSID */
1564 return;
1565 }
1566
1567 /* Reply with ProbeResp */
1568 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1569 if (!skb)
1570 return;
1571
1572 skb_reserve(skb, local->tx_headroom);
1573 skb_put_data(skb, presp->head, presp->head_len);
1574
1575 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1576 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1577 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1578
1579 /* avoid excessive retries for probe request to wildcard SSIDs */
1580 if (pos[1] == 0)
1581 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1582
1583 ieee80211_tx_skb(sdata, skb);
1584 }
1585
1586 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)1587 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1588 struct ieee80211_mgmt *mgmt, size_t len,
1589 struct ieee80211_rx_status *rx_status)
1590 {
1591 size_t baselen;
1592 struct ieee802_11_elems *elems;
1593
1594 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1595 offsetof(typeof(mgmt->u.beacon), variable));
1596
1597 /*
1598 * either beacon or probe_resp but the variable field is at the
1599 * same offset
1600 */
1601 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1602 if (baselen > len)
1603 return;
1604
1605 elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable,
1606 len - baselen, false, NULL);
1607
1608 if (elems) {
1609 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, elems);
1610 kfree(elems);
1611 }
1612 }
1613
ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1614 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1615 struct sk_buff *skb)
1616 {
1617 struct ieee80211_rx_status *rx_status;
1618 struct ieee80211_mgmt *mgmt;
1619 u16 fc;
1620 struct ieee802_11_elems *elems;
1621 int ies_len;
1622
1623 rx_status = IEEE80211_SKB_RXCB(skb);
1624 mgmt = (struct ieee80211_mgmt *) skb->data;
1625 fc = le16_to_cpu(mgmt->frame_control);
1626
1627 sdata_lock(sdata);
1628
1629 if (!sdata->u.ibss.ssid_len)
1630 goto mgmt_out; /* not ready to merge yet */
1631
1632 switch (fc & IEEE80211_FCTL_STYPE) {
1633 case IEEE80211_STYPE_PROBE_REQ:
1634 ieee80211_rx_mgmt_probe_req(sdata, skb);
1635 break;
1636 case IEEE80211_STYPE_PROBE_RESP:
1637 case IEEE80211_STYPE_BEACON:
1638 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1639 rx_status);
1640 break;
1641 case IEEE80211_STYPE_AUTH:
1642 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1643 break;
1644 case IEEE80211_STYPE_DEAUTH:
1645 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1646 break;
1647 case IEEE80211_STYPE_ACTION:
1648 switch (mgmt->u.action.category) {
1649 case WLAN_CATEGORY_SPECTRUM_MGMT:
1650 ies_len = skb->len -
1651 offsetof(struct ieee80211_mgmt,
1652 u.action.u.chan_switch.variable);
1653
1654 if (ies_len < 0)
1655 break;
1656
1657 elems = ieee802_11_parse_elems(
1658 mgmt->u.action.u.chan_switch.variable,
1659 ies_len, true, NULL);
1660
1661 if (elems && !elems->parse_error)
1662 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt,
1663 skb->len,
1664 rx_status,
1665 elems);
1666 kfree(elems);
1667 break;
1668 }
1669 }
1670
1671 mgmt_out:
1672 sdata_unlock(sdata);
1673 }
1674
ieee80211_ibss_work(struct ieee80211_sub_if_data * sdata)1675 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1676 {
1677 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1678 struct sta_info *sta;
1679
1680 sdata_lock(sdata);
1681
1682 /*
1683 * Work could be scheduled after scan or similar
1684 * when we aren't even joined (or trying) with a
1685 * network.
1686 */
1687 if (!ifibss->ssid_len)
1688 goto out;
1689
1690 spin_lock_bh(&ifibss->incomplete_lock);
1691 while (!list_empty(&ifibss->incomplete_stations)) {
1692 sta = list_first_entry(&ifibss->incomplete_stations,
1693 struct sta_info, list);
1694 list_del(&sta->list);
1695 spin_unlock_bh(&ifibss->incomplete_lock);
1696
1697 ieee80211_ibss_finish_sta(sta);
1698 rcu_read_unlock();
1699 spin_lock_bh(&ifibss->incomplete_lock);
1700 }
1701 spin_unlock_bh(&ifibss->incomplete_lock);
1702
1703 switch (ifibss->state) {
1704 case IEEE80211_IBSS_MLME_SEARCH:
1705 ieee80211_sta_find_ibss(sdata);
1706 break;
1707 case IEEE80211_IBSS_MLME_JOINED:
1708 ieee80211_sta_merge_ibss(sdata);
1709 break;
1710 default:
1711 WARN_ON(1);
1712 break;
1713 }
1714
1715 out:
1716 sdata_unlock(sdata);
1717 }
1718
ieee80211_ibss_timer(struct timer_list * t)1719 static void ieee80211_ibss_timer(struct timer_list *t)
1720 {
1721 struct ieee80211_sub_if_data *sdata =
1722 from_timer(sdata, t, u.ibss.timer);
1723
1724 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1725 }
1726
ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data * sdata)1727 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1728 {
1729 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1730
1731 timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0);
1732 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1733 spin_lock_init(&ifibss->incomplete_lock);
1734 INIT_WORK(&ifibss->csa_connection_drop_work,
1735 ieee80211_csa_connection_drop_work);
1736 }
1737
1738 /* scan finished notification */
ieee80211_ibss_notify_scan_completed(struct ieee80211_local * local)1739 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1740 {
1741 struct ieee80211_sub_if_data *sdata;
1742
1743 mutex_lock(&local->iflist_mtx);
1744 list_for_each_entry(sdata, &local->interfaces, list) {
1745 if (!ieee80211_sdata_running(sdata))
1746 continue;
1747 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1748 continue;
1749 sdata->u.ibss.last_scan_completed = jiffies;
1750 }
1751 mutex_unlock(&local->iflist_mtx);
1752 }
1753
ieee80211_ibss_join(struct ieee80211_sub_if_data * sdata,struct cfg80211_ibss_params * params)1754 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1755 struct cfg80211_ibss_params *params)
1756 {
1757 u32 changed = 0;
1758 u32 rate_flags;
1759 struct ieee80211_supported_band *sband;
1760 enum ieee80211_chanctx_mode chanmode;
1761 struct ieee80211_local *local = sdata->local;
1762 int radar_detect_width = 0;
1763 int i;
1764 int ret;
1765
1766 if (params->chandef.chan->freq_offset) {
1767 /* this may work, but is untested */
1768 return -EOPNOTSUPP;
1769 }
1770
1771 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1772 ¶ms->chandef,
1773 sdata->wdev.iftype);
1774 if (ret < 0)
1775 return ret;
1776
1777 if (ret > 0) {
1778 if (!params->userspace_handles_dfs)
1779 return -EINVAL;
1780 radar_detect_width = BIT(params->chandef.width);
1781 }
1782
1783 chanmode = (params->channel_fixed && !ret) ?
1784 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1785
1786 mutex_lock(&local->chanctx_mtx);
1787 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode,
1788 radar_detect_width);
1789 mutex_unlock(&local->chanctx_mtx);
1790 if (ret < 0)
1791 return ret;
1792
1793 if (params->bssid) {
1794 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1795 sdata->u.ibss.fixed_bssid = true;
1796 } else
1797 sdata->u.ibss.fixed_bssid = false;
1798
1799 sdata->u.ibss.privacy = params->privacy;
1800 sdata->u.ibss.control_port = params->control_port;
1801 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1802 sdata->u.ibss.basic_rates = params->basic_rates;
1803 sdata->u.ibss.last_scan_completed = jiffies;
1804
1805 /* fix basic_rates if channel does not support these rates */
1806 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef);
1807 sband = local->hw.wiphy->bands[params->chandef.chan->band];
1808 for (i = 0; i < sband->n_bitrates; i++) {
1809 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1810 sdata->u.ibss.basic_rates &= ~BIT(i);
1811 }
1812 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1813 sizeof(params->mcast_rate));
1814
1815 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1816
1817 sdata->u.ibss.chandef = params->chandef;
1818 sdata->u.ibss.fixed_channel = params->channel_fixed;
1819
1820 if (params->ie) {
1821 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1822 GFP_KERNEL);
1823 if (sdata->u.ibss.ie)
1824 sdata->u.ibss.ie_len = params->ie_len;
1825 }
1826
1827 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1828 sdata->u.ibss.ibss_join_req = jiffies;
1829
1830 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1831 sdata->u.ibss.ssid_len = params->ssid_len;
1832
1833 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa,
1834 sizeof(sdata->u.ibss.ht_capa));
1835 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask,
1836 sizeof(sdata->u.ibss.ht_capa_mask));
1837
1838 /*
1839 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1840 * reserved, but an HT STA shall protect HT transmissions as though
1841 * the HT Protection field were set to non-HT mixed mode.
1842 *
1843 * In an IBSS, the RIFS Mode field of the HT Operation element is
1844 * also reserved, but an HT STA shall operate as though this field
1845 * were set to 1.
1846 */
1847
1848 sdata->vif.bss_conf.ht_operation_mode |=
1849 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1850 | IEEE80211_HT_PARAM_RIFS_MODE;
1851
1852 changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE;
1853 ieee80211_link_info_change_notify(sdata, &sdata->deflink, changed);
1854
1855 sdata->deflink.smps_mode = IEEE80211_SMPS_OFF;
1856 sdata->deflink.needed_rx_chains = local->rx_chains;
1857 sdata->control_port_over_nl80211 = params->control_port_over_nl80211;
1858
1859 ieee80211_queue_work(&local->hw, &sdata->work);
1860
1861 return 0;
1862 }
1863
ieee80211_ibss_leave(struct ieee80211_sub_if_data * sdata)1864 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1865 {
1866 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1867
1868 ieee80211_ibss_disconnect(sdata);
1869 ifibss->ssid_len = 0;
1870 eth_zero_addr(ifibss->bssid);
1871
1872 /* remove beacon */
1873 kfree(sdata->u.ibss.ie);
1874 sdata->u.ibss.ie = NULL;
1875 sdata->u.ibss.ie_len = 0;
1876
1877 /* on the next join, re-program HT parameters */
1878 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1879 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1880
1881 synchronize_rcu();
1882
1883 skb_queue_purge(&sdata->skb_queue);
1884
1885 del_timer_sync(&sdata->u.ibss.timer);
1886
1887 return 0;
1888 }
1889