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_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,u64 * changed)480 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
481 struct cfg80211_csa_settings *csa_settings,
482 u64 *changed)
483 {
484 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
485 struct beacon_data *presp, *old_presp;
486 struct cfg80211_bss *cbss;
487 const struct cfg80211_bss_ies *ies;
488 u16 capability = WLAN_CAPABILITY_IBSS;
489 u64 tsf;
490
491 sdata_assert_lock(sdata);
492
493 if (ifibss->privacy)
494 capability |= WLAN_CAPABILITY_PRIVACY;
495
496 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
497 ifibss->bssid, ifibss->ssid,
498 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS,
499 IEEE80211_PRIVACY(ifibss->privacy));
500
501 if (WARN_ON(!cbss))
502 return -EINVAL;
503
504 rcu_read_lock();
505 ies = rcu_dereference(cbss->ies);
506 tsf = ies->tsf;
507 rcu_read_unlock();
508 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
509
510 old_presp = sdata_dereference(ifibss->presp, sdata);
511
512 presp = ieee80211_ibss_build_presp(sdata,
513 sdata->vif.bss_conf.beacon_int,
514 sdata->vif.bss_conf.basic_rates,
515 capability, tsf, &ifibss->chandef,
516 NULL, csa_settings);
517 if (!presp)
518 return -ENOMEM;
519
520 rcu_assign_pointer(ifibss->presp, presp);
521 if (old_presp)
522 kfree_rcu(old_presp, rcu_head);
523
524 *changed |= BSS_CHANGED_BEACON;
525 return 0;
526 }
527
ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data * sdata,u64 * changed)528 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata, u64 *changed)
529 {
530 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
531 struct cfg80211_bss *cbss;
532
533 sdata_assert_lock(sdata);
534
535 /* When not connected/joined, sending CSA doesn't make sense. */
536 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED)
537 return -ENOLINK;
538
539 /* update cfg80211 bss information with the new channel */
540 if (!is_zero_ether_addr(ifibss->bssid)) {
541 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
542 ifibss->chandef.chan,
543 ifibss->bssid, ifibss->ssid,
544 ifibss->ssid_len,
545 IEEE80211_BSS_TYPE_IBSS,
546 IEEE80211_PRIVACY(ifibss->privacy));
547 /* XXX: should not really modify cfg80211 data */
548 if (cbss) {
549 cbss->channel = sdata->deflink.csa_chandef.chan;
550 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
551 }
552 }
553
554 ifibss->chandef = sdata->deflink.csa_chandef;
555
556 /* generate the beacon */
557 return ieee80211_ibss_csa_beacon(sdata, NULL, changed);
558 }
559
ieee80211_ibss_stop(struct ieee80211_sub_if_data * sdata)560 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
561 {
562 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
563
564 wiphy_work_cancel(sdata->local->hw.wiphy,
565 &ifibss->csa_connection_drop_work);
566 }
567
ieee80211_ibss_finish_sta(struct sta_info * sta)568 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
569 __acquires(RCU)
570 {
571 struct ieee80211_sub_if_data *sdata = sta->sdata;
572 u8 addr[ETH_ALEN];
573
574 memcpy(addr, sta->sta.addr, ETH_ALEN);
575
576 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
577
578 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
579 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
580 /* authorize the station only if the network is not RSN protected. If
581 * not wait for the userspace to authorize it */
582 if (!sta->sdata->u.ibss.control_port)
583 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
584
585 rate_control_rate_init(sta);
586
587 /* If it fails, maybe we raced another insertion? */
588 if (sta_info_insert_rcu(sta))
589 return sta_info_get(sdata, addr);
590 return sta;
591 }
592
593 static struct sta_info *
ieee80211_ibss_add_sta(struct ieee80211_sub_if_data * sdata,const u8 * bssid,const u8 * addr,u32 supp_rates)594 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
595 const u8 *addr, u32 supp_rates)
596 __acquires(RCU)
597 {
598 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
599 struct ieee80211_local *local = sdata->local;
600 struct sta_info *sta;
601 struct ieee80211_chanctx_conf *chanctx_conf;
602 struct ieee80211_supported_band *sband;
603 enum nl80211_bss_scan_width scan_width;
604 int band;
605
606 /*
607 * XXX: Consider removing the least recently used entry and
608 * allow new one to be added.
609 */
610 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
611 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
612 sdata->name, addr);
613 rcu_read_lock();
614 return NULL;
615 }
616
617 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
618 rcu_read_lock();
619 return NULL;
620 }
621
622 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
623 rcu_read_lock();
624 return NULL;
625 }
626
627 rcu_read_lock();
628 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
629 if (WARN_ON_ONCE(!chanctx_conf))
630 return NULL;
631 band = chanctx_conf->def.chan->band;
632 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
633 rcu_read_unlock();
634
635 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
636 if (!sta) {
637 rcu_read_lock();
638 return NULL;
639 }
640
641 /* make sure mandatory rates are always added */
642 sband = local->hw.wiphy->bands[band];
643 sta->sta.deflink.supp_rates[band] = supp_rates |
644 ieee80211_mandatory_rates(sband, scan_width);
645
646 return ieee80211_ibss_finish_sta(sta);
647 }
648
ieee80211_sta_active_ibss(struct ieee80211_sub_if_data * sdata)649 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
650 {
651 struct ieee80211_local *local = sdata->local;
652 int active = 0;
653 struct sta_info *sta;
654
655 sdata_assert_lock(sdata);
656
657 rcu_read_lock();
658
659 list_for_each_entry_rcu(sta, &local->sta_list, list) {
660 unsigned long last_active = ieee80211_sta_last_active(sta);
661
662 if (sta->sdata == sdata &&
663 time_is_after_jiffies(last_active +
664 IEEE80211_IBSS_MERGE_INTERVAL)) {
665 active++;
666 break;
667 }
668 }
669
670 rcu_read_unlock();
671
672 return active;
673 }
674
ieee80211_ibss_disconnect(struct ieee80211_sub_if_data * sdata)675 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
676 {
677 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
678 struct ieee80211_local *local = sdata->local;
679 struct cfg80211_bss *cbss;
680 struct beacon_data *presp;
681 struct sta_info *sta;
682
683 if (!is_zero_ether_addr(ifibss->bssid)) {
684 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
685 ifibss->bssid, ifibss->ssid,
686 ifibss->ssid_len,
687 IEEE80211_BSS_TYPE_IBSS,
688 IEEE80211_PRIVACY(ifibss->privacy));
689
690 if (cbss) {
691 cfg80211_unlink_bss(local->hw.wiphy, cbss);
692 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
693 }
694 }
695
696 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
697
698 sta_info_flush(sdata);
699
700 spin_lock_bh(&ifibss->incomplete_lock);
701 while (!list_empty(&ifibss->incomplete_stations)) {
702 sta = list_first_entry(&ifibss->incomplete_stations,
703 struct sta_info, list);
704 list_del(&sta->list);
705 spin_unlock_bh(&ifibss->incomplete_lock);
706
707 sta_info_free(local, sta);
708 spin_lock_bh(&ifibss->incomplete_lock);
709 }
710 spin_unlock_bh(&ifibss->incomplete_lock);
711
712 netif_carrier_off(sdata->dev);
713
714 sdata->vif.cfg.ibss_joined = false;
715 sdata->vif.cfg.ibss_creator = false;
716 sdata->vif.bss_conf.enable_beacon = false;
717 sdata->vif.cfg.ssid_len = 0;
718
719 /* remove beacon */
720 presp = sdata_dereference(ifibss->presp, sdata);
721 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
722 if (presp)
723 kfree_rcu(presp, rcu_head);
724
725 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
726 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
727 BSS_CHANGED_IBSS);
728 drv_leave_ibss(local, sdata);
729 mutex_lock(&local->mtx);
730 ieee80211_link_release_channel(&sdata->deflink);
731 mutex_unlock(&local->mtx);
732 }
733
ieee80211_csa_connection_drop_work(struct wiphy * wiphy,struct wiphy_work * work)734 static void ieee80211_csa_connection_drop_work(struct wiphy *wiphy,
735 struct wiphy_work *work)
736 {
737 struct ieee80211_sub_if_data *sdata =
738 container_of(work, struct ieee80211_sub_if_data,
739 u.ibss.csa_connection_drop_work);
740
741 sdata_lock(sdata);
742
743 ieee80211_ibss_disconnect(sdata);
744 synchronize_rcu();
745 skb_queue_purge(&sdata->skb_queue);
746
747 /* trigger a scan to find another IBSS network to join */
748 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
749
750 sdata_unlock(sdata);
751 }
752
ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data * sdata)753 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
754 {
755 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
756 int err;
757
758 /* if the current channel is a DFS channel, mark the channel as
759 * unavailable.
760 */
761 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
762 &ifibss->chandef,
763 NL80211_IFTYPE_ADHOC);
764 if (err > 0)
765 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
766 GFP_ATOMIC);
767 }
768
769 static bool
ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data * sdata,struct ieee802_11_elems * elems,bool beacon)770 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
771 struct ieee802_11_elems *elems,
772 bool beacon)
773 {
774 struct cfg80211_csa_settings params;
775 struct ieee80211_csa_ie csa_ie;
776 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
777 enum nl80211_channel_type ch_type;
778 int err;
779 ieee80211_conn_flags_t conn_flags;
780 u32 vht_cap_info = 0;
781
782 sdata_assert_lock(sdata);
783
784 conn_flags = IEEE80211_CONN_DISABLE_VHT;
785
786 switch (ifibss->chandef.width) {
787 case NL80211_CHAN_WIDTH_5:
788 case NL80211_CHAN_WIDTH_10:
789 case NL80211_CHAN_WIDTH_20_NOHT:
790 conn_flags |= IEEE80211_CONN_DISABLE_HT;
791 fallthrough;
792 case NL80211_CHAN_WIDTH_20:
793 conn_flags |= IEEE80211_CONN_DISABLE_40MHZ;
794 break;
795 default:
796 break;
797 }
798
799 if (elems->vht_cap_elem)
800 vht_cap_info = le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
801
802 memset(¶ms, 0, sizeof(params));
803 err = ieee80211_parse_ch_switch_ie(sdata, elems,
804 ifibss->chandef.chan->band,
805 vht_cap_info,
806 conn_flags, ifibss->bssid, &csa_ie);
807 /* can't switch to destination channel, fail */
808 if (err < 0)
809 goto disconnect;
810
811 /* did not contain a CSA */
812 if (err)
813 return false;
814
815 /* channel switch is not supported, disconnect */
816 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
817 goto disconnect;
818
819 params.count = csa_ie.count;
820 params.chandef = csa_ie.chandef;
821
822 switch (ifibss->chandef.width) {
823 case NL80211_CHAN_WIDTH_20_NOHT:
824 case NL80211_CHAN_WIDTH_20:
825 case NL80211_CHAN_WIDTH_40:
826 /* keep our current HT mode (HT20/HT40+/HT40-), even if
827 * another mode has been announced. The mode is not adopted
828 * within the beacon while doing CSA and we should therefore
829 * keep the mode which we announce.
830 */
831 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
832 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan,
833 ch_type);
834 break;
835 case NL80211_CHAN_WIDTH_5:
836 case NL80211_CHAN_WIDTH_10:
837 if (params.chandef.width != ifibss->chandef.width) {
838 sdata_info(sdata,
839 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
840 ifibss->bssid,
841 params.chandef.chan->center_freq,
842 params.chandef.width,
843 params.chandef.center_freq1,
844 params.chandef.center_freq2);
845 goto disconnect;
846 }
847 break;
848 default:
849 /* should not happen, conn_flags should prevent VHT modes. */
850 WARN_ON(1);
851 goto disconnect;
852 }
853
854 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef,
855 NL80211_IFTYPE_ADHOC)) {
856 sdata_info(sdata,
857 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
858 ifibss->bssid,
859 params.chandef.chan->center_freq,
860 params.chandef.width,
861 params.chandef.center_freq1,
862 params.chandef.center_freq2);
863 goto disconnect;
864 }
865
866 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
867 ¶ms.chandef,
868 NL80211_IFTYPE_ADHOC);
869 if (err < 0)
870 goto disconnect;
871 if (err > 0 && !ifibss->userspace_handles_dfs) {
872 /* IBSS-DFS only allowed with a control program */
873 goto disconnect;
874 }
875
876 params.radar_required = err;
877
878 if (cfg80211_chandef_identical(¶ms.chandef,
879 &sdata->vif.bss_conf.chandef)) {
880 ibss_dbg(sdata,
881 "received csa with an identical chandef, ignoring\n");
882 return true;
883 }
884
885 /* all checks done, now perform the channel switch. */
886 ibss_dbg(sdata,
887 "received channel switch announcement to go to channel %d MHz\n",
888 params.chandef.chan->center_freq);
889
890 params.block_tx = !!csa_ie.mode;
891
892 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
893 ¶ms))
894 goto disconnect;
895
896 ieee80211_ibss_csa_mark_radar(sdata);
897
898 return true;
899 disconnect:
900 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
901 wiphy_work_queue(sdata->local->hw.wiphy,
902 &ifibss->csa_connection_drop_work);
903
904 ieee80211_ibss_csa_mark_radar(sdata);
905
906 return true;
907 }
908
909 static void
ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len,struct ieee80211_rx_status * rx_status,struct ieee802_11_elems * elems)910 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
911 struct ieee80211_mgmt *mgmt, size_t len,
912 struct ieee80211_rx_status *rx_status,
913 struct ieee802_11_elems *elems)
914 {
915 int required_len;
916
917 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
918 return;
919
920 /* CSA is the only action we handle for now */
921 if (mgmt->u.action.u.measurement.action_code !=
922 WLAN_ACTION_SPCT_CHL_SWITCH)
923 return;
924
925 required_len = IEEE80211_MIN_ACTION_SIZE +
926 sizeof(mgmt->u.action.u.chan_switch);
927 if (len < required_len)
928 return;
929
930 if (!sdata->vif.bss_conf.csa_active)
931 ieee80211_ibss_process_chanswitch(sdata, elems, false);
932 }
933
ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)934 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
935 struct ieee80211_mgmt *mgmt,
936 size_t len)
937 {
938 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
939
940 if (len < IEEE80211_DEAUTH_FRAME_LEN)
941 return;
942
943 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
944 ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason);
945 sta_info_destroy_addr(sdata, mgmt->sa);
946 }
947
ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)948 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
949 struct ieee80211_mgmt *mgmt,
950 size_t len)
951 {
952 u16 auth_alg, auth_transaction;
953
954 sdata_assert_lock(sdata);
955
956 if (len < 24 + 6)
957 return;
958
959 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
960 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
961
962 ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
963 ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n",
964 mgmt->bssid, auth_transaction);
965
966 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
967 return;
968
969 /*
970 * IEEE 802.11 standard does not require authentication in IBSS
971 * networks and most implementations do not seem to use it.
972 * However, try to reply to authentication attempts if someone
973 * has actually implemented this.
974 */
975 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
976 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
977 }
978
ieee80211_update_sta_info(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len,struct ieee80211_rx_status * rx_status,struct ieee802_11_elems * elems,struct ieee80211_channel * channel)979 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
980 struct ieee80211_mgmt *mgmt, size_t len,
981 struct ieee80211_rx_status *rx_status,
982 struct ieee802_11_elems *elems,
983 struct ieee80211_channel *channel)
984 {
985 struct sta_info *sta;
986 enum nl80211_band band = rx_status->band;
987 enum nl80211_bss_scan_width scan_width;
988 struct ieee80211_local *local = sdata->local;
989 struct ieee80211_supported_band *sband;
990 bool rates_updated = false;
991 u32 supp_rates = 0;
992
993 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
994 return;
995
996 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
997 return;
998
999 sband = local->hw.wiphy->bands[band];
1000 if (WARN_ON(!sband))
1001 return;
1002
1003 rcu_read_lock();
1004 sta = sta_info_get(sdata, mgmt->sa);
1005
1006 if (elems->supp_rates) {
1007 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1008 band, NULL);
1009 if (sta) {
1010 u32 prev_rates;
1011
1012 prev_rates = sta->sta.deflink.supp_rates[band];
1013 /* make sure mandatory rates are always added */
1014 scan_width = NL80211_BSS_CHAN_WIDTH_20;
1015 if (rx_status->bw == RATE_INFO_BW_5)
1016 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1017 else if (rx_status->bw == RATE_INFO_BW_10)
1018 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1019
1020 sta->sta.deflink.supp_rates[band] = supp_rates |
1021 ieee80211_mandatory_rates(sband, scan_width);
1022 if (sta->sta.deflink.supp_rates[band] != prev_rates) {
1023 ibss_dbg(sdata,
1024 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1025 sta->sta.addr, prev_rates,
1026 sta->sta.deflink.supp_rates[band]);
1027 rates_updated = true;
1028 }
1029 } else {
1030 rcu_read_unlock();
1031 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1032 mgmt->sa, supp_rates);
1033 }
1034 }
1035
1036 if (sta && !sta->sta.wme &&
1037 (elems->wmm_info || elems->s1g_capab) &&
1038 local->hw.queues >= IEEE80211_NUM_ACS) {
1039 sta->sta.wme = true;
1040 ieee80211_check_fast_xmit(sta);
1041 }
1042
1043 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1044 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1045 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1046 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1047 /* we both use HT */
1048 struct ieee80211_ht_cap htcap_ie;
1049 struct cfg80211_chan_def chandef;
1050 enum ieee80211_sta_rx_bandwidth bw = sta->sta.deflink.bandwidth;
1051
1052 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT);
1053 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef);
1054
1055 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1056 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1057 &htcap_ie,
1058 &sta->deflink);
1059
1060 if (elems->vht_operation && elems->vht_cap_elem &&
1061 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1062 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1063 /* we both use VHT */
1064 struct ieee80211_vht_cap cap_ie;
1065 struct ieee80211_sta_vht_cap cap = sta->sta.deflink.vht_cap;
1066 u32 vht_cap_info =
1067 le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
1068
1069 ieee80211_chandef_vht_oper(&local->hw, vht_cap_info,
1070 elems->vht_operation,
1071 elems->ht_operation,
1072 &chandef);
1073 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1074 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1075 &cap_ie, NULL,
1076 &sta->deflink);
1077 if (memcmp(&cap, &sta->sta.deflink.vht_cap, sizeof(cap)))
1078 rates_updated |= true;
1079 }
1080
1081 if (bw != sta->sta.deflink.bandwidth)
1082 rates_updated |= true;
1083
1084 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1085 &chandef))
1086 WARN_ON_ONCE(1);
1087 }
1088
1089 if (sta && rates_updated) {
1090 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1091 u8 rx_nss = sta->sta.deflink.rx_nss;
1092
1093 /* Force rx_nss recalculation */
1094 sta->sta.deflink.rx_nss = 0;
1095 rate_control_rate_init(sta);
1096 if (sta->sta.deflink.rx_nss != rx_nss)
1097 changed |= IEEE80211_RC_NSS_CHANGED;
1098
1099 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1100 }
1101
1102 rcu_read_unlock();
1103 }
1104
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)1105 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1106 struct ieee80211_mgmt *mgmt, size_t len,
1107 struct ieee80211_rx_status *rx_status,
1108 struct ieee802_11_elems *elems)
1109 {
1110 struct ieee80211_local *local = sdata->local;
1111 struct cfg80211_bss *cbss;
1112 struct ieee80211_bss *bss;
1113 struct ieee80211_channel *channel;
1114 u64 beacon_timestamp, rx_timestamp;
1115 u32 supp_rates = 0;
1116 enum nl80211_band band = rx_status->band;
1117
1118 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1119 if (!channel)
1120 return;
1121
1122 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1123
1124 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel);
1125 if (!bss)
1126 return;
1127
1128 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1129
1130 /* same for beacon and probe response */
1131 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1132
1133 /* check if we need to merge IBSS */
1134
1135 /* not an IBSS */
1136 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1137 goto put_bss;
1138
1139 /* different channel */
1140 if (sdata->u.ibss.fixed_channel &&
1141 sdata->u.ibss.chandef.chan != cbss->channel)
1142 goto put_bss;
1143
1144 /* different SSID */
1145 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1146 memcmp(elems->ssid, sdata->u.ibss.ssid,
1147 sdata->u.ibss.ssid_len))
1148 goto put_bss;
1149
1150 /* process channel switch */
1151 if (sdata->vif.bss_conf.csa_active ||
1152 ieee80211_ibss_process_chanswitch(sdata, elems, true))
1153 goto put_bss;
1154
1155 /* same BSSID */
1156 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1157 goto put_bss;
1158
1159 /* we use a fixed BSSID */
1160 if (sdata->u.ibss.fixed_bssid)
1161 goto put_bss;
1162
1163 if (ieee80211_have_rx_timestamp(rx_status)) {
1164 /* time when timestamp field was received */
1165 rx_timestamp =
1166 ieee80211_calculate_rx_timestamp(local, rx_status,
1167 len + FCS_LEN, 24);
1168 } else {
1169 /*
1170 * second best option: get current TSF
1171 * (will return -1 if not supported)
1172 */
1173 rx_timestamp = drv_get_tsf(local, sdata);
1174 }
1175
1176 ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n",
1177 mgmt->sa, mgmt->bssid,
1178 (unsigned long long)rx_timestamp);
1179 ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n",
1180 (unsigned long long)beacon_timestamp,
1181 (unsigned long long)(rx_timestamp - beacon_timestamp),
1182 jiffies);
1183
1184 if (beacon_timestamp > rx_timestamp) {
1185 ibss_dbg(sdata,
1186 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1187 mgmt->bssid);
1188 ieee80211_sta_join_ibss(sdata, bss);
1189 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1190 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1191 supp_rates);
1192 rcu_read_unlock();
1193 }
1194
1195 put_bss:
1196 ieee80211_rx_bss_put(local, bss);
1197 }
1198
ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data * sdata,const u8 * bssid,const u8 * addr,u32 supp_rates)1199 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1200 const u8 *bssid, const u8 *addr,
1201 u32 supp_rates)
1202 {
1203 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1204 struct ieee80211_local *local = sdata->local;
1205 struct sta_info *sta;
1206 struct ieee80211_chanctx_conf *chanctx_conf;
1207 struct ieee80211_supported_band *sband;
1208 enum nl80211_bss_scan_width scan_width;
1209 int band;
1210
1211 /*
1212 * XXX: Consider removing the least recently used entry and
1213 * allow new one to be added.
1214 */
1215 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1216 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1217 sdata->name, addr);
1218 return;
1219 }
1220
1221 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1222 return;
1223
1224 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1225 return;
1226
1227 rcu_read_lock();
1228 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
1229 if (WARN_ON_ONCE(!chanctx_conf)) {
1230 rcu_read_unlock();
1231 return;
1232 }
1233 band = chanctx_conf->def.chan->band;
1234 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1235 rcu_read_unlock();
1236
1237 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1238 if (!sta)
1239 return;
1240
1241 /* make sure mandatory rates are always added */
1242 sband = local->hw.wiphy->bands[band];
1243 sta->sta.deflink.supp_rates[band] = supp_rates |
1244 ieee80211_mandatory_rates(sband, scan_width);
1245
1246 spin_lock(&ifibss->incomplete_lock);
1247 list_add(&sta->list, &ifibss->incomplete_stations);
1248 spin_unlock(&ifibss->incomplete_lock);
1249 wiphy_work_queue(local->hw.wiphy, &sdata->work);
1250 }
1251
ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data * sdata)1252 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1253 {
1254 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1255 struct ieee80211_local *local = sdata->local;
1256 struct sta_info *sta, *tmp;
1257 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1258 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1259
1260 mutex_lock(&local->sta_mtx);
1261
1262 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1263 unsigned long last_active = ieee80211_sta_last_active(sta);
1264
1265 if (sdata != sta->sdata)
1266 continue;
1267
1268 if (time_is_before_jiffies(last_active + exp_time) ||
1269 (time_is_before_jiffies(last_active + exp_rsn) &&
1270 sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1271 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
1272
1273 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1274 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1275 "not authorized " : "", sta->sta.addr);
1276
1277 ieee80211_send_deauth_disassoc(sdata, sta->sta.addr,
1278 ifibss->bssid,
1279 IEEE80211_STYPE_DEAUTH,
1280 WLAN_REASON_DEAUTH_LEAVING,
1281 true, frame_buf);
1282 WARN_ON(__sta_info_destroy(sta));
1283 }
1284 }
1285
1286 mutex_unlock(&local->sta_mtx);
1287 }
1288
1289 /*
1290 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1291 */
1292
ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data * sdata)1293 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1294 {
1295 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1296 enum nl80211_bss_scan_width scan_width;
1297
1298 sdata_assert_lock(sdata);
1299
1300 mod_timer(&ifibss->timer,
1301 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1302
1303 ieee80211_ibss_sta_expire(sdata);
1304
1305 if (time_before(jiffies, ifibss->last_scan_completed +
1306 IEEE80211_IBSS_MERGE_INTERVAL))
1307 return;
1308
1309 if (ieee80211_sta_active_ibss(sdata))
1310 return;
1311
1312 if (ifibss->fixed_channel)
1313 return;
1314
1315 sdata_info(sdata,
1316 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1317
1318 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1319 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1320 NULL, 0, scan_width);
1321 }
1322
ieee80211_sta_create_ibss(struct ieee80211_sub_if_data * sdata)1323 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1324 {
1325 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1326 u8 bssid[ETH_ALEN];
1327 u16 capability;
1328 int i;
1329
1330 sdata_assert_lock(sdata);
1331
1332 if (ifibss->fixed_bssid) {
1333 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1334 } else {
1335 /* Generate random, not broadcast, locally administered BSSID. Mix in
1336 * own MAC address to make sure that devices that do not have proper
1337 * random number generator get different BSSID. */
1338 get_random_bytes(bssid, ETH_ALEN);
1339 for (i = 0; i < ETH_ALEN; i++)
1340 bssid[i] ^= sdata->vif.addr[i];
1341 bssid[0] &= ~0x01;
1342 bssid[0] |= 0x02;
1343 }
1344
1345 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1346
1347 capability = WLAN_CAPABILITY_IBSS;
1348
1349 if (ifibss->privacy)
1350 capability |= WLAN_CAPABILITY_PRIVACY;
1351
1352 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1353 &ifibss->chandef, ifibss->basic_rates,
1354 capability, 0, true);
1355 }
1356
ibss_setup_channels(struct wiphy * wiphy,struct ieee80211_channel ** channels,unsigned int channels_max,u32 center_freq,u32 width)1357 static unsigned int ibss_setup_channels(struct wiphy *wiphy,
1358 struct ieee80211_channel **channels,
1359 unsigned int channels_max,
1360 u32 center_freq, u32 width)
1361 {
1362 struct ieee80211_channel *chan = NULL;
1363 unsigned int n_chan = 0;
1364 u32 start_freq, end_freq, freq;
1365
1366 if (width <= 20) {
1367 start_freq = center_freq;
1368 end_freq = center_freq;
1369 } else {
1370 start_freq = center_freq - width / 2 + 10;
1371 end_freq = center_freq + width / 2 - 10;
1372 }
1373
1374 for (freq = start_freq; freq <= end_freq; freq += 20) {
1375 chan = ieee80211_get_channel(wiphy, freq);
1376 if (!chan)
1377 continue;
1378 if (n_chan >= channels_max)
1379 return n_chan;
1380
1381 channels[n_chan] = chan;
1382 n_chan++;
1383 }
1384
1385 return n_chan;
1386 }
1387
1388 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)1389 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1390 const struct cfg80211_chan_def *chandef,
1391 struct ieee80211_channel **channels,
1392 unsigned int channels_max)
1393 {
1394 unsigned int n_chan = 0;
1395 u32 width, cf1, cf2 = 0;
1396
1397 switch (chandef->width) {
1398 case NL80211_CHAN_WIDTH_40:
1399 width = 40;
1400 break;
1401 case NL80211_CHAN_WIDTH_80P80:
1402 cf2 = chandef->center_freq2;
1403 fallthrough;
1404 case NL80211_CHAN_WIDTH_80:
1405 width = 80;
1406 break;
1407 case NL80211_CHAN_WIDTH_160:
1408 width = 160;
1409 break;
1410 default:
1411 width = 20;
1412 break;
1413 }
1414
1415 cf1 = chandef->center_freq1;
1416
1417 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1418
1419 if (cf2)
1420 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1421 channels_max - n_chan, cf2,
1422 width);
1423
1424 return n_chan;
1425 }
1426
1427 /*
1428 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1429 */
1430
ieee80211_sta_find_ibss(struct ieee80211_sub_if_data * sdata)1431 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1432 {
1433 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1434 struct ieee80211_local *local = sdata->local;
1435 struct cfg80211_bss *cbss;
1436 struct ieee80211_channel *chan = NULL;
1437 const u8 *bssid = NULL;
1438 enum nl80211_bss_scan_width scan_width;
1439 int active_ibss;
1440
1441 sdata_assert_lock(sdata);
1442
1443 active_ibss = ieee80211_sta_active_ibss(sdata);
1444 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1445
1446 if (active_ibss)
1447 return;
1448
1449 if (ifibss->fixed_bssid)
1450 bssid = ifibss->bssid;
1451 if (ifibss->fixed_channel)
1452 chan = ifibss->chandef.chan;
1453 if (!is_zero_ether_addr(ifibss->bssid))
1454 bssid = ifibss->bssid;
1455 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1456 ifibss->ssid, ifibss->ssid_len,
1457 IEEE80211_BSS_TYPE_IBSS,
1458 IEEE80211_PRIVACY(ifibss->privacy));
1459
1460 if (cbss) {
1461 struct ieee80211_bss *bss;
1462
1463 bss = (void *)cbss->priv;
1464 ibss_dbg(sdata,
1465 "sta_find_ibss: selected %pM current %pM\n",
1466 cbss->bssid, ifibss->bssid);
1467 sdata_info(sdata,
1468 "Selected IBSS BSSID %pM based on configured SSID\n",
1469 cbss->bssid);
1470
1471 ieee80211_sta_join_ibss(sdata, bss);
1472 ieee80211_rx_bss_put(local, bss);
1473 return;
1474 }
1475
1476 /* if a fixed bssid and a fixed freq have been provided create the IBSS
1477 * directly and do not waste time scanning
1478 */
1479 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1480 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1481 bssid);
1482 ieee80211_sta_create_ibss(sdata);
1483 return;
1484 }
1485
1486
1487 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1488
1489 /* Selected IBSS not found in current scan results - try to scan */
1490 if (time_after(jiffies, ifibss->last_scan_completed +
1491 IEEE80211_SCAN_INTERVAL)) {
1492 struct ieee80211_channel *channels[8];
1493 unsigned int num;
1494
1495 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1496
1497 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1498
1499 if (ifibss->fixed_channel) {
1500 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1501 &ifibss->chandef,
1502 channels,
1503 ARRAY_SIZE(channels));
1504 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1505 ifibss->ssid_len, channels,
1506 num, scan_width);
1507 } else {
1508 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1509 ifibss->ssid_len, NULL,
1510 0, scan_width);
1511 }
1512 } else {
1513 int interval = IEEE80211_SCAN_INTERVAL;
1514
1515 if (time_after(jiffies, ifibss->ibss_join_req +
1516 IEEE80211_IBSS_JOIN_TIMEOUT))
1517 ieee80211_sta_create_ibss(sdata);
1518
1519 mod_timer(&ifibss->timer,
1520 round_jiffies(jiffies + interval));
1521 }
1522 }
1523
ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data * sdata,struct sk_buff * req)1524 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1525 struct sk_buff *req)
1526 {
1527 struct ieee80211_mgmt *mgmt = (void *)req->data;
1528 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1529 struct ieee80211_local *local = sdata->local;
1530 int tx_last_beacon, len = req->len;
1531 struct sk_buff *skb;
1532 struct beacon_data *presp;
1533 u8 *pos, *end;
1534
1535 sdata_assert_lock(sdata);
1536
1537 presp = sdata_dereference(ifibss->presp, sdata);
1538
1539 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1540 len < 24 + 2 || !presp)
1541 return;
1542
1543 tx_last_beacon = drv_tx_last_beacon(local);
1544
1545 ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
1546 ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n",
1547 mgmt->bssid, tx_last_beacon);
1548
1549 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1550 return;
1551
1552 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1553 !is_broadcast_ether_addr(mgmt->bssid))
1554 return;
1555
1556 end = ((u8 *) mgmt) + len;
1557 pos = mgmt->u.probe_req.variable;
1558 if (pos[0] != WLAN_EID_SSID ||
1559 pos + 2 + pos[1] > end) {
1560 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1561 mgmt->sa);
1562 return;
1563 }
1564 if (pos[1] != 0 &&
1565 (pos[1] != ifibss->ssid_len ||
1566 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1567 /* Ignore ProbeReq for foreign SSID */
1568 return;
1569 }
1570
1571 /* Reply with ProbeResp */
1572 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1573 if (!skb)
1574 return;
1575
1576 skb_reserve(skb, local->tx_headroom);
1577 skb_put_data(skb, presp->head, presp->head_len);
1578
1579 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1580 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1581 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1582
1583 /* avoid excessive retries for probe request to wildcard SSIDs */
1584 if (pos[1] == 0)
1585 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1586
1587 ieee80211_tx_skb(sdata, skb);
1588 }
1589
1590 static
ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len,struct ieee80211_rx_status * rx_status)1591 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1592 struct ieee80211_mgmt *mgmt, size_t len,
1593 struct ieee80211_rx_status *rx_status)
1594 {
1595 size_t baselen;
1596 struct ieee802_11_elems *elems;
1597
1598 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1599 offsetof(typeof(mgmt->u.beacon), variable));
1600
1601 /*
1602 * either beacon or probe_resp but the variable field is at the
1603 * same offset
1604 */
1605 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1606 if (baselen > len)
1607 return;
1608
1609 elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable,
1610 len - baselen, false, NULL);
1611
1612 if (elems) {
1613 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, elems);
1614 kfree(elems);
1615 }
1616 }
1617
ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1618 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1619 struct sk_buff *skb)
1620 {
1621 struct ieee80211_rx_status *rx_status;
1622 struct ieee80211_mgmt *mgmt;
1623 u16 fc;
1624 struct ieee802_11_elems *elems;
1625 int ies_len;
1626
1627 rx_status = IEEE80211_SKB_RXCB(skb);
1628 mgmt = (struct ieee80211_mgmt *) skb->data;
1629 fc = le16_to_cpu(mgmt->frame_control);
1630
1631 sdata_lock(sdata);
1632
1633 if (!sdata->u.ibss.ssid_len)
1634 goto mgmt_out; /* not ready to merge yet */
1635
1636 switch (fc & IEEE80211_FCTL_STYPE) {
1637 case IEEE80211_STYPE_PROBE_REQ:
1638 ieee80211_rx_mgmt_probe_req(sdata, skb);
1639 break;
1640 case IEEE80211_STYPE_PROBE_RESP:
1641 case IEEE80211_STYPE_BEACON:
1642 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1643 rx_status);
1644 break;
1645 case IEEE80211_STYPE_AUTH:
1646 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1647 break;
1648 case IEEE80211_STYPE_DEAUTH:
1649 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1650 break;
1651 case IEEE80211_STYPE_ACTION:
1652 switch (mgmt->u.action.category) {
1653 case WLAN_CATEGORY_SPECTRUM_MGMT:
1654 ies_len = skb->len -
1655 offsetof(struct ieee80211_mgmt,
1656 u.action.u.chan_switch.variable);
1657
1658 if (ies_len < 0)
1659 break;
1660
1661 elems = ieee802_11_parse_elems(
1662 mgmt->u.action.u.chan_switch.variable,
1663 ies_len, true, NULL);
1664
1665 if (elems && !elems->parse_error)
1666 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt,
1667 skb->len,
1668 rx_status,
1669 elems);
1670 kfree(elems);
1671 break;
1672 }
1673 }
1674
1675 mgmt_out:
1676 sdata_unlock(sdata);
1677 }
1678
ieee80211_ibss_work(struct ieee80211_sub_if_data * sdata)1679 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1680 {
1681 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1682 struct sta_info *sta;
1683
1684 sdata_lock(sdata);
1685
1686 /*
1687 * Work could be scheduled after scan or similar
1688 * when we aren't even joined (or trying) with a
1689 * network.
1690 */
1691 if (!ifibss->ssid_len)
1692 goto out;
1693
1694 spin_lock_bh(&ifibss->incomplete_lock);
1695 while (!list_empty(&ifibss->incomplete_stations)) {
1696 sta = list_first_entry(&ifibss->incomplete_stations,
1697 struct sta_info, list);
1698 list_del(&sta->list);
1699 spin_unlock_bh(&ifibss->incomplete_lock);
1700
1701 ieee80211_ibss_finish_sta(sta);
1702 rcu_read_unlock();
1703 spin_lock_bh(&ifibss->incomplete_lock);
1704 }
1705 spin_unlock_bh(&ifibss->incomplete_lock);
1706
1707 switch (ifibss->state) {
1708 case IEEE80211_IBSS_MLME_SEARCH:
1709 ieee80211_sta_find_ibss(sdata);
1710 break;
1711 case IEEE80211_IBSS_MLME_JOINED:
1712 ieee80211_sta_merge_ibss(sdata);
1713 break;
1714 default:
1715 WARN_ON(1);
1716 break;
1717 }
1718
1719 out:
1720 sdata_unlock(sdata);
1721 }
1722
ieee80211_ibss_timer(struct timer_list * t)1723 static void ieee80211_ibss_timer(struct timer_list *t)
1724 {
1725 struct ieee80211_sub_if_data *sdata =
1726 from_timer(sdata, t, u.ibss.timer);
1727
1728 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
1729 }
1730
ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data * sdata)1731 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1732 {
1733 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1734
1735 timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0);
1736 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1737 spin_lock_init(&ifibss->incomplete_lock);
1738 wiphy_work_init(&ifibss->csa_connection_drop_work,
1739 ieee80211_csa_connection_drop_work);
1740 }
1741
1742 /* scan finished notification */
ieee80211_ibss_notify_scan_completed(struct ieee80211_local * local)1743 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1744 {
1745 struct ieee80211_sub_if_data *sdata;
1746
1747 mutex_lock(&local->iflist_mtx);
1748 list_for_each_entry(sdata, &local->interfaces, list) {
1749 if (!ieee80211_sdata_running(sdata))
1750 continue;
1751 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1752 continue;
1753 sdata->u.ibss.last_scan_completed = jiffies;
1754 }
1755 mutex_unlock(&local->iflist_mtx);
1756 }
1757
ieee80211_ibss_join(struct ieee80211_sub_if_data * sdata,struct cfg80211_ibss_params * params)1758 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1759 struct cfg80211_ibss_params *params)
1760 {
1761 u64 changed = 0;
1762 u32 rate_flags;
1763 struct ieee80211_supported_band *sband;
1764 enum ieee80211_chanctx_mode chanmode;
1765 struct ieee80211_local *local = sdata->local;
1766 int radar_detect_width = 0;
1767 int i;
1768 int ret;
1769
1770 if (params->chandef.chan->freq_offset) {
1771 /* this may work, but is untested */
1772 return -EOPNOTSUPP;
1773 }
1774
1775 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1776 ¶ms->chandef,
1777 sdata->wdev.iftype);
1778 if (ret < 0)
1779 return ret;
1780
1781 if (ret > 0) {
1782 if (!params->userspace_handles_dfs)
1783 return -EINVAL;
1784 radar_detect_width = BIT(params->chandef.width);
1785 }
1786
1787 chanmode = (params->channel_fixed && !ret) ?
1788 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1789
1790 mutex_lock(&local->chanctx_mtx);
1791 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode,
1792 radar_detect_width);
1793 mutex_unlock(&local->chanctx_mtx);
1794 if (ret < 0)
1795 return ret;
1796
1797 if (params->bssid) {
1798 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1799 sdata->u.ibss.fixed_bssid = true;
1800 } else
1801 sdata->u.ibss.fixed_bssid = false;
1802
1803 sdata->u.ibss.privacy = params->privacy;
1804 sdata->u.ibss.control_port = params->control_port;
1805 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1806 sdata->u.ibss.basic_rates = params->basic_rates;
1807 sdata->u.ibss.last_scan_completed = jiffies;
1808
1809 /* fix basic_rates if channel does not support these rates */
1810 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef);
1811 sband = local->hw.wiphy->bands[params->chandef.chan->band];
1812 for (i = 0; i < sband->n_bitrates; i++) {
1813 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1814 sdata->u.ibss.basic_rates &= ~BIT(i);
1815 }
1816 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1817 sizeof(params->mcast_rate));
1818
1819 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1820
1821 sdata->u.ibss.chandef = params->chandef;
1822 sdata->u.ibss.fixed_channel = params->channel_fixed;
1823
1824 if (params->ie) {
1825 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1826 GFP_KERNEL);
1827 if (sdata->u.ibss.ie)
1828 sdata->u.ibss.ie_len = params->ie_len;
1829 }
1830
1831 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1832 sdata->u.ibss.ibss_join_req = jiffies;
1833
1834 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1835 sdata->u.ibss.ssid_len = params->ssid_len;
1836
1837 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa,
1838 sizeof(sdata->u.ibss.ht_capa));
1839 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask,
1840 sizeof(sdata->u.ibss.ht_capa_mask));
1841
1842 /*
1843 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1844 * reserved, but an HT STA shall protect HT transmissions as though
1845 * the HT Protection field were set to non-HT mixed mode.
1846 *
1847 * In an IBSS, the RIFS Mode field of the HT Operation element is
1848 * also reserved, but an HT STA shall operate as though this field
1849 * were set to 1.
1850 */
1851
1852 sdata->vif.bss_conf.ht_operation_mode |=
1853 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1854 | IEEE80211_HT_PARAM_RIFS_MODE;
1855
1856 changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE;
1857 ieee80211_link_info_change_notify(sdata, &sdata->deflink, changed);
1858
1859 sdata->deflink.smps_mode = IEEE80211_SMPS_OFF;
1860 sdata->deflink.needed_rx_chains = local->rx_chains;
1861 sdata->control_port_over_nl80211 = params->control_port_over_nl80211;
1862
1863 wiphy_work_queue(local->hw.wiphy, &sdata->work);
1864
1865 return 0;
1866 }
1867
ieee80211_ibss_leave(struct ieee80211_sub_if_data * sdata)1868 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1869 {
1870 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1871
1872 ieee80211_ibss_disconnect(sdata);
1873 ifibss->ssid_len = 0;
1874 eth_zero_addr(ifibss->bssid);
1875
1876 /* remove beacon */
1877 kfree(sdata->u.ibss.ie);
1878 sdata->u.ibss.ie = NULL;
1879 sdata->u.ibss.ie_len = 0;
1880
1881 /* on the next join, re-program HT parameters */
1882 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1883 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1884
1885 synchronize_rcu();
1886
1887 skb_queue_purge(&sdata->skb_queue);
1888
1889 del_timer_sync(&sdata->u.ibss.timer);
1890
1891 return 0;
1892 }
1893