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) 2018-2019 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->csa_counter_offsets[0] = (pos - presp->head);
149 *pos++ = csa_settings->count;
150 presp->csa_current_counter = csa_settings->count;
151 }
152
153 /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
154 if (rates_n > 8) {
155 *pos++ = WLAN_EID_EXT_SUPP_RATES;
156 *pos++ = rates_n - 8;
157 for (; ri < sband->n_bitrates; ri++) {
158 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
159 5 * (1 << shift));
160 u8 basic = 0;
161 if (!(rates & BIT(ri)))
162 continue;
163
164 if (basic_rates & BIT(ri))
165 basic = 0x80;
166 *pos++ = basic | (u8) rate;
167 }
168 }
169
170 if (ifibss->ie_len) {
171 memcpy(pos, ifibss->ie, ifibss->ie_len);
172 pos += ifibss->ie_len;
173 }
174
175 /* add HT capability and information IEs */
176 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
177 chandef->width != NL80211_CHAN_WIDTH_5 &&
178 chandef->width != NL80211_CHAN_WIDTH_10 &&
179 sband->ht_cap.ht_supported) {
180 struct ieee80211_sta_ht_cap ht_cap;
181
182 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
183 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
184
185 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
186 /*
187 * Note: According to 802.11n-2009 9.13.3.1, HT Protection
188 * field and RIFS Mode are reserved in IBSS mode, therefore
189 * keep them at 0
190 */
191 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
192 chandef, 0, false);
193
194 /* add VHT capability and information IEs */
195 if (chandef->width != NL80211_CHAN_WIDTH_20 &&
196 chandef->width != NL80211_CHAN_WIDTH_40 &&
197 sband->vht_cap.vht_supported) {
198 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
199 sband->vht_cap.cap);
200 pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap,
201 chandef);
202 }
203 }
204
205 if (local->hw.queues >= IEEE80211_NUM_ACS)
206 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */
207
208 presp->head_len = pos - presp->head;
209 if (WARN_ON(presp->head_len > frame_len))
210 goto error;
211
212 return presp;
213 error:
214 kfree(presp);
215 return NULL;
216 }
217
__ieee80211_sta_join_ibss(struct ieee80211_sub_if_data * sdata,const u8 * bssid,const int beacon_int,struct cfg80211_chan_def * req_chandef,const u32 basic_rates,const u16 capability,u64 tsf,bool creator)218 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
219 const u8 *bssid, const int beacon_int,
220 struct cfg80211_chan_def *req_chandef,
221 const u32 basic_rates,
222 const u16 capability, u64 tsf,
223 bool creator)
224 {
225 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
226 struct ieee80211_local *local = sdata->local;
227 struct ieee80211_mgmt *mgmt;
228 struct cfg80211_bss *bss;
229 u32 bss_change;
230 struct cfg80211_chan_def chandef;
231 struct ieee80211_channel *chan;
232 struct beacon_data *presp;
233 struct cfg80211_inform_bss bss_meta = {};
234 bool have_higher_than_11mbit;
235 bool radar_required;
236 int err;
237
238 sdata_assert_lock(sdata);
239
240 /* Reset own TSF to allow time synchronization work. */
241 drv_reset_tsf(local, sdata);
242
243 if (!ether_addr_equal(ifibss->bssid, bssid))
244 sta_info_flush(sdata);
245
246 /* if merging, indicate to driver that we leave the old IBSS */
247 if (sdata->vif.bss_conf.ibss_joined) {
248 sdata->vif.bss_conf.ibss_joined = false;
249 sdata->vif.bss_conf.ibss_creator = false;
250 sdata->vif.bss_conf.enable_beacon = false;
251 netif_carrier_off(sdata->dev);
252 ieee80211_bss_info_change_notify(sdata,
253 BSS_CHANGED_IBSS |
254 BSS_CHANGED_BEACON_ENABLED);
255 drv_leave_ibss(local, sdata);
256 }
257
258 presp = rcu_dereference_protected(ifibss->presp,
259 lockdep_is_held(&sdata->wdev.mtx));
260 RCU_INIT_POINTER(ifibss->presp, NULL);
261 if (presp)
262 kfree_rcu(presp, rcu_head);
263
264 /* make a copy of the chandef, it could be modified below. */
265 chandef = *req_chandef;
266 chan = chandef.chan;
267 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
268 NL80211_IFTYPE_ADHOC)) {
269 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
270 chandef.width == NL80211_CHAN_WIDTH_10 ||
271 chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
272 chandef.width == NL80211_CHAN_WIDTH_20) {
273 sdata_info(sdata,
274 "Failed to join IBSS, beacons forbidden\n");
275 return;
276 }
277 chandef.width = NL80211_CHAN_WIDTH_20;
278 chandef.center_freq1 = chan->center_freq;
279 /* check again for downgraded chandef */
280 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
281 NL80211_IFTYPE_ADHOC)) {
282 sdata_info(sdata,
283 "Failed to join IBSS, beacons forbidden\n");
284 return;
285 }
286 }
287
288 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
289 &chandef, NL80211_IFTYPE_ADHOC);
290 if (err < 0) {
291 sdata_info(sdata,
292 "Failed to join IBSS, invalid chandef\n");
293 return;
294 }
295 if (err > 0 && !ifibss->userspace_handles_dfs) {
296 sdata_info(sdata,
297 "Failed to join IBSS, DFS channel without control program\n");
298 return;
299 }
300
301 radar_required = err;
302
303 mutex_lock(&local->mtx);
304 if (ieee80211_vif_use_channel(sdata, &chandef,
305 ifibss->fixed_channel ?
306 IEEE80211_CHANCTX_SHARED :
307 IEEE80211_CHANCTX_EXCLUSIVE)) {
308 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
309 mutex_unlock(&local->mtx);
310 return;
311 }
312 sdata->radar_required = radar_required;
313 mutex_unlock(&local->mtx);
314
315 memcpy(ifibss->bssid, bssid, ETH_ALEN);
316
317 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
318 capability, tsf, &chandef,
319 &have_higher_than_11mbit, NULL);
320 if (!presp)
321 return;
322
323 rcu_assign_pointer(ifibss->presp, presp);
324 mgmt = (void *)presp->head;
325
326 sdata->vif.bss_conf.enable_beacon = true;
327 sdata->vif.bss_conf.beacon_int = beacon_int;
328 sdata->vif.bss_conf.basic_rates = basic_rates;
329 sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
330 memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
331 bss_change = BSS_CHANGED_BEACON_INT;
332 bss_change |= ieee80211_reset_erp_info(sdata);
333 bss_change |= BSS_CHANGED_BSSID;
334 bss_change |= BSS_CHANGED_BEACON;
335 bss_change |= BSS_CHANGED_BEACON_ENABLED;
336 bss_change |= BSS_CHANGED_BASIC_RATES;
337 bss_change |= BSS_CHANGED_HT;
338 bss_change |= BSS_CHANGED_IBSS;
339 bss_change |= BSS_CHANGED_SSID;
340
341 /*
342 * In 5 GHz/802.11a, we can always use short slot time.
343 * (IEEE 802.11-2012 18.3.8.7)
344 *
345 * In 2.4GHz, we must always use long slots in IBSS for compatibility
346 * reasons.
347 * (IEEE 802.11-2012 19.4.5)
348 *
349 * HT follows these specifications (IEEE 802.11-2012 20.3.18)
350 */
351 sdata->vif.bss_conf.use_short_slot = chan->band == NL80211_BAND_5GHZ;
352 bss_change |= BSS_CHANGED_ERP_SLOT;
353
354 /* cf. IEEE 802.11 9.2.12 */
355 if (chan->band == NL80211_BAND_2GHZ && have_higher_than_11mbit)
356 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
357 else
358 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
359
360 ieee80211_set_wmm_default(sdata, true, false);
361
362 sdata->vif.bss_conf.ibss_joined = true;
363 sdata->vif.bss_conf.ibss_creator = creator;
364
365 err = drv_join_ibss(local, sdata);
366 if (err) {
367 sdata->vif.bss_conf.ibss_joined = false;
368 sdata->vif.bss_conf.ibss_creator = false;
369 sdata->vif.bss_conf.enable_beacon = false;
370 sdata->vif.bss_conf.ssid_len = 0;
371 RCU_INIT_POINTER(ifibss->presp, NULL);
372 kfree_rcu(presp, rcu_head);
373 mutex_lock(&local->mtx);
374 ieee80211_vif_release_channel(sdata);
375 mutex_unlock(&local->mtx);
376 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
377 err);
378 return;
379 }
380
381 ieee80211_bss_info_change_notify(sdata, bss_change);
382
383 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
384 mod_timer(&ifibss->timer,
385 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
386
387 bss_meta.chan = chan;
388 bss_meta.scan_width = cfg80211_chandef_to_scan_width(&chandef);
389 bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt,
390 presp->head_len, GFP_KERNEL);
391
392 cfg80211_put_bss(local->hw.wiphy, bss);
393 netif_carrier_on(sdata->dev);
394 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
395 }
396
ieee80211_sta_join_ibss(struct ieee80211_sub_if_data * sdata,struct ieee80211_bss * bss)397 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
398 struct ieee80211_bss *bss)
399 {
400 struct cfg80211_bss *cbss =
401 container_of((void *)bss, struct cfg80211_bss, priv);
402 struct ieee80211_supported_band *sband;
403 struct cfg80211_chan_def chandef;
404 u32 basic_rates;
405 int i, j;
406 u16 beacon_int = cbss->beacon_interval;
407 const struct cfg80211_bss_ies *ies;
408 enum nl80211_channel_type chan_type;
409 u64 tsf;
410 u32 rate_flags;
411 int shift;
412
413 sdata_assert_lock(sdata);
414
415 if (beacon_int < 10)
416 beacon_int = 10;
417
418 switch (sdata->u.ibss.chandef.width) {
419 case NL80211_CHAN_WIDTH_20_NOHT:
420 case NL80211_CHAN_WIDTH_20:
421 case NL80211_CHAN_WIDTH_40:
422 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
423 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
424 break;
425 case NL80211_CHAN_WIDTH_5:
426 case NL80211_CHAN_WIDTH_10:
427 cfg80211_chandef_create(&chandef, cbss->channel,
428 NL80211_CHAN_NO_HT);
429 chandef.width = sdata->u.ibss.chandef.width;
430 break;
431 case NL80211_CHAN_WIDTH_80:
432 case NL80211_CHAN_WIDTH_80P80:
433 case NL80211_CHAN_WIDTH_160:
434 chandef = sdata->u.ibss.chandef;
435 chandef.chan = cbss->channel;
436 break;
437 default:
438 /* fall back to 20 MHz for unsupported modes */
439 cfg80211_chandef_create(&chandef, cbss->channel,
440 NL80211_CHAN_NO_HT);
441 break;
442 }
443
444 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
445 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
446 shift = ieee80211_vif_get_shift(&sdata->vif);
447
448 basic_rates = 0;
449
450 for (i = 0; i < bss->supp_rates_len; i++) {
451 int rate = bss->supp_rates[i] & 0x7f;
452 bool is_basic = !!(bss->supp_rates[i] & 0x80);
453
454 for (j = 0; j < sband->n_bitrates; j++) {
455 int brate;
456 if ((rate_flags & sband->bitrates[j].flags)
457 != rate_flags)
458 continue;
459
460 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
461 5 * (1 << shift));
462 if (brate == rate) {
463 if (is_basic)
464 basic_rates |= BIT(j);
465 break;
466 }
467 }
468 }
469
470 rcu_read_lock();
471 ies = rcu_dereference(cbss->ies);
472 tsf = ies->tsf;
473 rcu_read_unlock();
474
475 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
476 beacon_int,
477 &chandef,
478 basic_rates,
479 cbss->capability,
480 tsf, false);
481 }
482
ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data * sdata,struct cfg80211_csa_settings * csa_settings)483 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
484 struct cfg80211_csa_settings *csa_settings)
485 {
486 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
487 struct beacon_data *presp, *old_presp;
488 struct cfg80211_bss *cbss;
489 const struct cfg80211_bss_ies *ies;
490 u16 capability = WLAN_CAPABILITY_IBSS;
491 u64 tsf;
492 int ret = 0;
493
494 sdata_assert_lock(sdata);
495
496 if (ifibss->privacy)
497 capability |= WLAN_CAPABILITY_PRIVACY;
498
499 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
500 ifibss->bssid, ifibss->ssid,
501 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS,
502 IEEE80211_PRIVACY(ifibss->privacy));
503
504 if (WARN_ON(!cbss)) {
505 ret = -EINVAL;
506 goto out;
507 }
508
509 rcu_read_lock();
510 ies = rcu_dereference(cbss->ies);
511 tsf = ies->tsf;
512 rcu_read_unlock();
513 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
514
515 old_presp = rcu_dereference_protected(ifibss->presp,
516 lockdep_is_held(&sdata->wdev.mtx));
517
518 presp = ieee80211_ibss_build_presp(sdata,
519 sdata->vif.bss_conf.beacon_int,
520 sdata->vif.bss_conf.basic_rates,
521 capability, tsf, &ifibss->chandef,
522 NULL, csa_settings);
523 if (!presp) {
524 ret = -ENOMEM;
525 goto out;
526 }
527
528 rcu_assign_pointer(ifibss->presp, presp);
529 if (old_presp)
530 kfree_rcu(old_presp, rcu_head);
531
532 return BSS_CHANGED_BEACON;
533 out:
534 return ret;
535 }
536
ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data * sdata)537 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
538 {
539 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
540 struct cfg80211_bss *cbss;
541 int err, changed = 0;
542
543 sdata_assert_lock(sdata);
544
545 /* When not connected/joined, sending CSA doesn't make sense. */
546 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED)
547 return -ENOLINK;
548
549 /* update cfg80211 bss information with the new channel */
550 if (!is_zero_ether_addr(ifibss->bssid)) {
551 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
552 ifibss->chandef.chan,
553 ifibss->bssid, ifibss->ssid,
554 ifibss->ssid_len,
555 IEEE80211_BSS_TYPE_IBSS,
556 IEEE80211_PRIVACY(ifibss->privacy));
557 /* XXX: should not really modify cfg80211 data */
558 if (cbss) {
559 cbss->channel = sdata->csa_chandef.chan;
560 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
561 }
562 }
563
564 ifibss->chandef = sdata->csa_chandef;
565
566 /* generate the beacon */
567 err = ieee80211_ibss_csa_beacon(sdata, NULL);
568 if (err < 0)
569 return err;
570
571 changed |= err;
572
573 return changed;
574 }
575
ieee80211_ibss_stop(struct ieee80211_sub_if_data * sdata)576 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
577 {
578 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
579
580 cancel_work_sync(&ifibss->csa_connection_drop_work);
581 }
582
ieee80211_ibss_finish_sta(struct sta_info * sta)583 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
584 __acquires(RCU)
585 {
586 struct ieee80211_sub_if_data *sdata = sta->sdata;
587 u8 addr[ETH_ALEN];
588
589 memcpy(addr, sta->sta.addr, ETH_ALEN);
590
591 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
592
593 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
594 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
595 /* authorize the station only if the network is not RSN protected. If
596 * not wait for the userspace to authorize it */
597 if (!sta->sdata->u.ibss.control_port)
598 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
599
600 rate_control_rate_init(sta);
601
602 /* If it fails, maybe we raced another insertion? */
603 if (sta_info_insert_rcu(sta))
604 return sta_info_get(sdata, addr);
605 return sta;
606 }
607
608 static struct sta_info *
ieee80211_ibss_add_sta(struct ieee80211_sub_if_data * sdata,const u8 * bssid,const u8 * addr,u32 supp_rates)609 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
610 const u8 *addr, u32 supp_rates)
611 __acquires(RCU)
612 {
613 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
614 struct ieee80211_local *local = sdata->local;
615 struct sta_info *sta;
616 struct ieee80211_chanctx_conf *chanctx_conf;
617 struct ieee80211_supported_band *sband;
618 enum nl80211_bss_scan_width scan_width;
619 int band;
620
621 /*
622 * XXX: Consider removing the least recently used entry and
623 * allow new one to be added.
624 */
625 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
626 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
627 sdata->name, addr);
628 rcu_read_lock();
629 return NULL;
630 }
631
632 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
633 rcu_read_lock();
634 return NULL;
635 }
636
637 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
638 rcu_read_lock();
639 return NULL;
640 }
641
642 rcu_read_lock();
643 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
644 if (WARN_ON_ONCE(!chanctx_conf))
645 return NULL;
646 band = chanctx_conf->def.chan->band;
647 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
648 rcu_read_unlock();
649
650 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
651 if (!sta) {
652 rcu_read_lock();
653 return NULL;
654 }
655
656 /* make sure mandatory rates are always added */
657 sband = local->hw.wiphy->bands[band];
658 sta->sta.supp_rates[band] = supp_rates |
659 ieee80211_mandatory_rates(sband, scan_width);
660
661 return ieee80211_ibss_finish_sta(sta);
662 }
663
ieee80211_sta_active_ibss(struct ieee80211_sub_if_data * sdata)664 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
665 {
666 struct ieee80211_local *local = sdata->local;
667 int active = 0;
668 struct sta_info *sta;
669
670 sdata_assert_lock(sdata);
671
672 rcu_read_lock();
673
674 list_for_each_entry_rcu(sta, &local->sta_list, list) {
675 unsigned long last_active = ieee80211_sta_last_active(sta);
676
677 if (sta->sdata == sdata &&
678 time_is_after_jiffies(last_active +
679 IEEE80211_IBSS_MERGE_INTERVAL)) {
680 active++;
681 break;
682 }
683 }
684
685 rcu_read_unlock();
686
687 return active;
688 }
689
ieee80211_ibss_disconnect(struct ieee80211_sub_if_data * sdata)690 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
691 {
692 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
693 struct ieee80211_local *local = sdata->local;
694 struct cfg80211_bss *cbss;
695 struct beacon_data *presp;
696 struct sta_info *sta;
697
698 if (!is_zero_ether_addr(ifibss->bssid)) {
699 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
700 ifibss->bssid, ifibss->ssid,
701 ifibss->ssid_len,
702 IEEE80211_BSS_TYPE_IBSS,
703 IEEE80211_PRIVACY(ifibss->privacy));
704
705 if (cbss) {
706 cfg80211_unlink_bss(local->hw.wiphy, cbss);
707 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
708 }
709 }
710
711 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
712
713 sta_info_flush(sdata);
714
715 spin_lock_bh(&ifibss->incomplete_lock);
716 while (!list_empty(&ifibss->incomplete_stations)) {
717 sta = list_first_entry(&ifibss->incomplete_stations,
718 struct sta_info, list);
719 list_del(&sta->list);
720 spin_unlock_bh(&ifibss->incomplete_lock);
721
722 sta_info_free(local, sta);
723 spin_lock_bh(&ifibss->incomplete_lock);
724 }
725 spin_unlock_bh(&ifibss->incomplete_lock);
726
727 netif_carrier_off(sdata->dev);
728
729 sdata->vif.bss_conf.ibss_joined = false;
730 sdata->vif.bss_conf.ibss_creator = false;
731 sdata->vif.bss_conf.enable_beacon = false;
732 sdata->vif.bss_conf.ssid_len = 0;
733
734 /* remove beacon */
735 presp = rcu_dereference_protected(ifibss->presp,
736 lockdep_is_held(&sdata->wdev.mtx));
737 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
738 if (presp)
739 kfree_rcu(presp, rcu_head);
740
741 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
742 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
743 BSS_CHANGED_IBSS);
744 drv_leave_ibss(local, sdata);
745 mutex_lock(&local->mtx);
746 ieee80211_vif_release_channel(sdata);
747 mutex_unlock(&local->mtx);
748 }
749
ieee80211_csa_connection_drop_work(struct work_struct * work)750 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
751 {
752 struct ieee80211_sub_if_data *sdata =
753 container_of(work, struct ieee80211_sub_if_data,
754 u.ibss.csa_connection_drop_work);
755
756 sdata_lock(sdata);
757
758 ieee80211_ibss_disconnect(sdata);
759 synchronize_rcu();
760 skb_queue_purge(&sdata->skb_queue);
761
762 /* trigger a scan to find another IBSS network to join */
763 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
764
765 sdata_unlock(sdata);
766 }
767
ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data * sdata)768 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
769 {
770 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
771 int err;
772
773 /* if the current channel is a DFS channel, mark the channel as
774 * unavailable.
775 */
776 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
777 &ifibss->chandef,
778 NL80211_IFTYPE_ADHOC);
779 if (err > 0)
780 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
781 GFP_ATOMIC);
782 }
783
784 static bool
ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data * sdata,struct ieee802_11_elems * elems,bool beacon)785 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
786 struct ieee802_11_elems *elems,
787 bool beacon)
788 {
789 struct cfg80211_csa_settings params;
790 struct ieee80211_csa_ie csa_ie;
791 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
792 enum nl80211_channel_type ch_type;
793 int err;
794 u32 sta_flags;
795
796 sdata_assert_lock(sdata);
797
798 sta_flags = IEEE80211_STA_DISABLE_VHT;
799 switch (ifibss->chandef.width) {
800 case NL80211_CHAN_WIDTH_5:
801 case NL80211_CHAN_WIDTH_10:
802 case NL80211_CHAN_WIDTH_20_NOHT:
803 sta_flags |= IEEE80211_STA_DISABLE_HT;
804 /* fall through */
805 case NL80211_CHAN_WIDTH_20:
806 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
807 break;
808 default:
809 break;
810 }
811
812 memset(¶ms, 0, sizeof(params));
813 err = ieee80211_parse_ch_switch_ie(sdata, elems,
814 ifibss->chandef.chan->band,
815 sta_flags, ifibss->bssid, &csa_ie);
816 /* can't switch to destination channel, fail */
817 if (err < 0)
818 goto disconnect;
819
820 /* did not contain a CSA */
821 if (err)
822 return false;
823
824 /* channel switch is not supported, disconnect */
825 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
826 goto disconnect;
827
828 params.count = csa_ie.count;
829 params.chandef = csa_ie.chandef;
830
831 switch (ifibss->chandef.width) {
832 case NL80211_CHAN_WIDTH_20_NOHT:
833 case NL80211_CHAN_WIDTH_20:
834 case NL80211_CHAN_WIDTH_40:
835 /* keep our current HT mode (HT20/HT40+/HT40-), even if
836 * another mode has been announced. The mode is not adopted
837 * within the beacon while doing CSA and we should therefore
838 * keep the mode which we announce.
839 */
840 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
841 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan,
842 ch_type);
843 break;
844 case NL80211_CHAN_WIDTH_5:
845 case NL80211_CHAN_WIDTH_10:
846 if (params.chandef.width != ifibss->chandef.width) {
847 sdata_info(sdata,
848 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
849 ifibss->bssid,
850 params.chandef.chan->center_freq,
851 params.chandef.width,
852 params.chandef.center_freq1,
853 params.chandef.center_freq2);
854 goto disconnect;
855 }
856 break;
857 default:
858 /* should not happen, sta_flags should prevent VHT modes. */
859 WARN_ON(1);
860 goto disconnect;
861 }
862
863 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef,
864 NL80211_IFTYPE_ADHOC)) {
865 sdata_info(sdata,
866 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
867 ifibss->bssid,
868 params.chandef.chan->center_freq,
869 params.chandef.width,
870 params.chandef.center_freq1,
871 params.chandef.center_freq2);
872 goto disconnect;
873 }
874
875 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
876 ¶ms.chandef,
877 NL80211_IFTYPE_ADHOC);
878 if (err < 0)
879 goto disconnect;
880 if (err > 0 && !ifibss->userspace_handles_dfs) {
881 /* IBSS-DFS only allowed with a control program */
882 goto disconnect;
883 }
884
885 params.radar_required = err;
886
887 if (cfg80211_chandef_identical(¶ms.chandef,
888 &sdata->vif.bss_conf.chandef)) {
889 ibss_dbg(sdata,
890 "received csa with an identical chandef, ignoring\n");
891 return true;
892 }
893
894 /* all checks done, now perform the channel switch. */
895 ibss_dbg(sdata,
896 "received channel switch announcement to go to channel %d MHz\n",
897 params.chandef.chan->center_freq);
898
899 params.block_tx = !!csa_ie.mode;
900
901 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
902 ¶ms))
903 goto disconnect;
904
905 ieee80211_ibss_csa_mark_radar(sdata);
906
907 return true;
908 disconnect:
909 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
910 ieee80211_queue_work(&sdata->local->hw,
911 &ifibss->csa_connection_drop_work);
912
913 ieee80211_ibss_csa_mark_radar(sdata);
914
915 return true;
916 }
917
918 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)919 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
920 struct ieee80211_mgmt *mgmt, size_t len,
921 struct ieee80211_rx_status *rx_status,
922 struct ieee802_11_elems *elems)
923 {
924 int required_len;
925
926 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
927 return;
928
929 /* CSA is the only action we handle for now */
930 if (mgmt->u.action.u.measurement.action_code !=
931 WLAN_ACTION_SPCT_CHL_SWITCH)
932 return;
933
934 required_len = IEEE80211_MIN_ACTION_SIZE +
935 sizeof(mgmt->u.action.u.chan_switch);
936 if (len < required_len)
937 return;
938
939 if (!sdata->vif.csa_active)
940 ieee80211_ibss_process_chanswitch(sdata, elems, false);
941 }
942
ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)943 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
944 struct ieee80211_mgmt *mgmt,
945 size_t len)
946 {
947 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
948
949 if (len < IEEE80211_DEAUTH_FRAME_LEN)
950 return;
951
952 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
953 ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason);
954 sta_info_destroy_addr(sdata, mgmt->sa);
955 }
956
ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)957 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
958 struct ieee80211_mgmt *mgmt,
959 size_t len)
960 {
961 u16 auth_alg, auth_transaction;
962
963 sdata_assert_lock(sdata);
964
965 if (len < 24 + 6)
966 return;
967
968 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
969 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
970
971 ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
972 ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n",
973 mgmt->bssid, auth_transaction);
974
975 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
976 return;
977
978 /*
979 * IEEE 802.11 standard does not require authentication in IBSS
980 * networks and most implementations do not seem to use it.
981 * However, try to reply to authentication attempts if someone
982 * has actually implemented this.
983 */
984 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
985 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
986 }
987
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)988 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
989 struct ieee80211_mgmt *mgmt, size_t len,
990 struct ieee80211_rx_status *rx_status,
991 struct ieee802_11_elems *elems,
992 struct ieee80211_channel *channel)
993 {
994 struct sta_info *sta;
995 enum nl80211_band band = rx_status->band;
996 enum nl80211_bss_scan_width scan_width;
997 struct ieee80211_local *local = sdata->local;
998 struct ieee80211_supported_band *sband;
999 bool rates_updated = false;
1000 u32 supp_rates = 0;
1001
1002 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1003 return;
1004
1005 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
1006 return;
1007
1008 sband = local->hw.wiphy->bands[band];
1009 if (WARN_ON(!sband))
1010 return;
1011
1012 rcu_read_lock();
1013 sta = sta_info_get(sdata, mgmt->sa);
1014
1015 if (elems->supp_rates) {
1016 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1017 band, NULL);
1018 if (sta) {
1019 u32 prev_rates;
1020
1021 prev_rates = sta->sta.supp_rates[band];
1022 /* make sure mandatory rates are always added */
1023 scan_width = NL80211_BSS_CHAN_WIDTH_20;
1024 if (rx_status->bw == RATE_INFO_BW_5)
1025 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1026 else if (rx_status->bw == RATE_INFO_BW_10)
1027 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1028
1029 sta->sta.supp_rates[band] = supp_rates |
1030 ieee80211_mandatory_rates(sband, scan_width);
1031 if (sta->sta.supp_rates[band] != prev_rates) {
1032 ibss_dbg(sdata,
1033 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1034 sta->sta.addr, prev_rates,
1035 sta->sta.supp_rates[band]);
1036 rates_updated = true;
1037 }
1038 } else {
1039 rcu_read_unlock();
1040 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1041 mgmt->sa, supp_rates);
1042 }
1043 }
1044
1045 if (sta && !sta->sta.wme &&
1046 elems->wmm_info && local->hw.queues >= IEEE80211_NUM_ACS) {
1047 sta->sta.wme = true;
1048 ieee80211_check_fast_xmit(sta);
1049 }
1050
1051 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1052 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1053 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1054 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1055 /* we both use HT */
1056 struct ieee80211_ht_cap htcap_ie;
1057 struct cfg80211_chan_def chandef;
1058 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
1059
1060 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT);
1061 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef);
1062
1063 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1064 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1065 &htcap_ie,
1066 sta);
1067
1068 if (elems->vht_operation && elems->vht_cap_elem &&
1069 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1070 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1071 /* we both use VHT */
1072 struct ieee80211_vht_cap cap_ie;
1073 struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap;
1074
1075 ieee80211_chandef_vht_oper(&local->hw,
1076 elems->vht_operation,
1077 elems->ht_operation,
1078 &chandef);
1079 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1080 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1081 &cap_ie, sta);
1082 if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap)))
1083 rates_updated |= true;
1084 }
1085
1086 if (bw != sta->sta.bandwidth)
1087 rates_updated |= true;
1088
1089 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1090 &chandef))
1091 WARN_ON_ONCE(1);
1092 }
1093
1094 if (sta && rates_updated) {
1095 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1096 u8 rx_nss = sta->sta.rx_nss;
1097
1098 /* Force rx_nss recalculation */
1099 sta->sta.rx_nss = 0;
1100 rate_control_rate_init(sta);
1101 if (sta->sta.rx_nss != rx_nss)
1102 changed |= IEEE80211_RC_NSS_CHANGED;
1103
1104 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1105 }
1106
1107 rcu_read_unlock();
1108 }
1109
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)1110 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1111 struct ieee80211_mgmt *mgmt, size_t len,
1112 struct ieee80211_rx_status *rx_status,
1113 struct ieee802_11_elems *elems)
1114 {
1115 struct ieee80211_local *local = sdata->local;
1116 struct cfg80211_bss *cbss;
1117 struct ieee80211_bss *bss;
1118 struct ieee80211_channel *channel;
1119 u64 beacon_timestamp, rx_timestamp;
1120 u32 supp_rates = 0;
1121 enum nl80211_band band = rx_status->band;
1122
1123 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1124 if (!channel)
1125 return;
1126
1127 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1128
1129 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel);
1130 if (!bss)
1131 return;
1132
1133 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1134
1135 /* same for beacon and probe response */
1136 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1137
1138 /* check if we need to merge IBSS */
1139
1140 /* not an IBSS */
1141 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1142 goto put_bss;
1143
1144 /* different channel */
1145 if (sdata->u.ibss.fixed_channel &&
1146 sdata->u.ibss.chandef.chan != cbss->channel)
1147 goto put_bss;
1148
1149 /* different SSID */
1150 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1151 memcmp(elems->ssid, sdata->u.ibss.ssid,
1152 sdata->u.ibss.ssid_len))
1153 goto put_bss;
1154
1155 /* process channel switch */
1156 if (sdata->vif.csa_active ||
1157 ieee80211_ibss_process_chanswitch(sdata, elems, true))
1158 goto put_bss;
1159
1160 /* same BSSID */
1161 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1162 goto put_bss;
1163
1164 /* we use a fixed BSSID */
1165 if (sdata->u.ibss.fixed_bssid)
1166 goto put_bss;
1167
1168 if (ieee80211_have_rx_timestamp(rx_status)) {
1169 /* time when timestamp field was received */
1170 rx_timestamp =
1171 ieee80211_calculate_rx_timestamp(local, rx_status,
1172 len + FCS_LEN, 24);
1173 } else {
1174 /*
1175 * second best option: get current TSF
1176 * (will return -1 if not supported)
1177 */
1178 rx_timestamp = drv_get_tsf(local, sdata);
1179 }
1180
1181 ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n",
1182 mgmt->sa, mgmt->bssid,
1183 (unsigned long long)rx_timestamp);
1184 ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n",
1185 (unsigned long long)beacon_timestamp,
1186 (unsigned long long)(rx_timestamp - beacon_timestamp),
1187 jiffies);
1188
1189 if (beacon_timestamp > rx_timestamp) {
1190 ibss_dbg(sdata,
1191 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1192 mgmt->bssid);
1193 ieee80211_sta_join_ibss(sdata, bss);
1194 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1195 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1196 supp_rates);
1197 rcu_read_unlock();
1198 }
1199
1200 put_bss:
1201 ieee80211_rx_bss_put(local, bss);
1202 }
1203
ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data * sdata,const u8 * bssid,const u8 * addr,u32 supp_rates)1204 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1205 const u8 *bssid, const u8 *addr,
1206 u32 supp_rates)
1207 {
1208 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1209 struct ieee80211_local *local = sdata->local;
1210 struct sta_info *sta;
1211 struct ieee80211_chanctx_conf *chanctx_conf;
1212 struct ieee80211_supported_band *sband;
1213 enum nl80211_bss_scan_width scan_width;
1214 int band;
1215
1216 /*
1217 * XXX: Consider removing the least recently used entry and
1218 * allow new one to be added.
1219 */
1220 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1221 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1222 sdata->name, addr);
1223 return;
1224 }
1225
1226 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1227 return;
1228
1229 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1230 return;
1231
1232 rcu_read_lock();
1233 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1234 if (WARN_ON_ONCE(!chanctx_conf)) {
1235 rcu_read_unlock();
1236 return;
1237 }
1238 band = chanctx_conf->def.chan->band;
1239 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1240 rcu_read_unlock();
1241
1242 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1243 if (!sta)
1244 return;
1245
1246 /* make sure mandatory rates are always added */
1247 sband = local->hw.wiphy->bands[band];
1248 sta->sta.supp_rates[band] = supp_rates |
1249 ieee80211_mandatory_rates(sband, scan_width);
1250
1251 spin_lock(&ifibss->incomplete_lock);
1252 list_add(&sta->list, &ifibss->incomplete_stations);
1253 spin_unlock(&ifibss->incomplete_lock);
1254 ieee80211_queue_work(&local->hw, &sdata->work);
1255 }
1256
ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data * sdata)1257 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1258 {
1259 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1260 struct ieee80211_local *local = sdata->local;
1261 struct sta_info *sta, *tmp;
1262 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1263 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1264
1265 mutex_lock(&local->sta_mtx);
1266
1267 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1268 unsigned long last_active = ieee80211_sta_last_active(sta);
1269
1270 if (sdata != sta->sdata)
1271 continue;
1272
1273 if (time_is_before_jiffies(last_active + exp_time) ||
1274 (time_is_before_jiffies(last_active + exp_rsn) &&
1275 sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1276 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
1277
1278 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1279 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1280 "not authorized " : "", sta->sta.addr);
1281
1282 ieee80211_send_deauth_disassoc(sdata, sta->sta.addr,
1283 ifibss->bssid,
1284 IEEE80211_STYPE_DEAUTH,
1285 WLAN_REASON_DEAUTH_LEAVING,
1286 true, frame_buf);
1287 WARN_ON(__sta_info_destroy(sta));
1288 }
1289 }
1290
1291 mutex_unlock(&local->sta_mtx);
1292 }
1293
1294 /*
1295 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1296 */
1297
ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data * sdata)1298 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1299 {
1300 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1301 enum nl80211_bss_scan_width scan_width;
1302
1303 sdata_assert_lock(sdata);
1304
1305 mod_timer(&ifibss->timer,
1306 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1307
1308 ieee80211_ibss_sta_expire(sdata);
1309
1310 if (time_before(jiffies, ifibss->last_scan_completed +
1311 IEEE80211_IBSS_MERGE_INTERVAL))
1312 return;
1313
1314 if (ieee80211_sta_active_ibss(sdata))
1315 return;
1316
1317 if (ifibss->fixed_channel)
1318 return;
1319
1320 sdata_info(sdata,
1321 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1322
1323 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1324 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1325 NULL, 0, scan_width);
1326 }
1327
ieee80211_sta_create_ibss(struct ieee80211_sub_if_data * sdata)1328 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1329 {
1330 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1331 u8 bssid[ETH_ALEN];
1332 u16 capability;
1333 int i;
1334
1335 sdata_assert_lock(sdata);
1336
1337 if (ifibss->fixed_bssid) {
1338 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1339 } else {
1340 /* Generate random, not broadcast, locally administered BSSID. Mix in
1341 * own MAC address to make sure that devices that do not have proper
1342 * random number generator get different BSSID. */
1343 get_random_bytes(bssid, ETH_ALEN);
1344 for (i = 0; i < ETH_ALEN; i++)
1345 bssid[i] ^= sdata->vif.addr[i];
1346 bssid[0] &= ~0x01;
1347 bssid[0] |= 0x02;
1348 }
1349
1350 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1351
1352 capability = WLAN_CAPABILITY_IBSS;
1353
1354 if (ifibss->privacy)
1355 capability |= WLAN_CAPABILITY_PRIVACY;
1356
1357 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1358 &ifibss->chandef, ifibss->basic_rates,
1359 capability, 0, true);
1360 }
1361
ibss_setup_channels(struct wiphy * wiphy,struct ieee80211_channel ** channels,unsigned int channels_max,u32 center_freq,u32 width)1362 static unsigned ibss_setup_channels(struct wiphy *wiphy,
1363 struct ieee80211_channel **channels,
1364 unsigned int channels_max,
1365 u32 center_freq, u32 width)
1366 {
1367 struct ieee80211_channel *chan = NULL;
1368 unsigned int n_chan = 0;
1369 u32 start_freq, end_freq, freq;
1370
1371 if (width <= 20) {
1372 start_freq = center_freq;
1373 end_freq = center_freq;
1374 } else {
1375 start_freq = center_freq - width / 2 + 10;
1376 end_freq = center_freq + width / 2 - 10;
1377 }
1378
1379 for (freq = start_freq; freq <= end_freq; freq += 20) {
1380 chan = ieee80211_get_channel(wiphy, freq);
1381 if (!chan)
1382 continue;
1383 if (n_chan >= channels_max)
1384 return n_chan;
1385
1386 channels[n_chan] = chan;
1387 n_chan++;
1388 }
1389
1390 return n_chan;
1391 }
1392
1393 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)1394 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1395 const struct cfg80211_chan_def *chandef,
1396 struct ieee80211_channel **channels,
1397 unsigned int channels_max)
1398 {
1399 unsigned int n_chan = 0;
1400 u32 width, cf1, cf2 = 0;
1401
1402 switch (chandef->width) {
1403 case NL80211_CHAN_WIDTH_40:
1404 width = 40;
1405 break;
1406 case NL80211_CHAN_WIDTH_80P80:
1407 cf2 = chandef->center_freq2;
1408 /* fall through */
1409 case NL80211_CHAN_WIDTH_80:
1410 width = 80;
1411 break;
1412 case NL80211_CHAN_WIDTH_160:
1413 width = 160;
1414 break;
1415 default:
1416 width = 20;
1417 break;
1418 }
1419
1420 cf1 = chandef->center_freq1;
1421
1422 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1423
1424 if (cf2)
1425 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1426 channels_max - n_chan, cf2,
1427 width);
1428
1429 return n_chan;
1430 }
1431
1432 /*
1433 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1434 */
1435
ieee80211_sta_find_ibss(struct ieee80211_sub_if_data * sdata)1436 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1437 {
1438 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1439 struct ieee80211_local *local = sdata->local;
1440 struct cfg80211_bss *cbss;
1441 struct ieee80211_channel *chan = NULL;
1442 const u8 *bssid = NULL;
1443 enum nl80211_bss_scan_width scan_width;
1444 int active_ibss;
1445
1446 sdata_assert_lock(sdata);
1447
1448 active_ibss = ieee80211_sta_active_ibss(sdata);
1449 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1450
1451 if (active_ibss)
1452 return;
1453
1454 if (ifibss->fixed_bssid)
1455 bssid = ifibss->bssid;
1456 if (ifibss->fixed_channel)
1457 chan = ifibss->chandef.chan;
1458 if (!is_zero_ether_addr(ifibss->bssid))
1459 bssid = ifibss->bssid;
1460 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1461 ifibss->ssid, ifibss->ssid_len,
1462 IEEE80211_BSS_TYPE_IBSS,
1463 IEEE80211_PRIVACY(ifibss->privacy));
1464
1465 if (cbss) {
1466 struct ieee80211_bss *bss;
1467
1468 bss = (void *)cbss->priv;
1469 ibss_dbg(sdata,
1470 "sta_find_ibss: selected %pM current %pM\n",
1471 cbss->bssid, ifibss->bssid);
1472 sdata_info(sdata,
1473 "Selected IBSS BSSID %pM based on configured SSID\n",
1474 cbss->bssid);
1475
1476 ieee80211_sta_join_ibss(sdata, bss);
1477 ieee80211_rx_bss_put(local, bss);
1478 return;
1479 }
1480
1481 /* if a fixed bssid and a fixed freq have been provided create the IBSS
1482 * directly and do not waste time scanning
1483 */
1484 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1485 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1486 bssid);
1487 ieee80211_sta_create_ibss(sdata);
1488 return;
1489 }
1490
1491
1492 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1493
1494 /* Selected IBSS not found in current scan results - try to scan */
1495 if (time_after(jiffies, ifibss->last_scan_completed +
1496 IEEE80211_SCAN_INTERVAL)) {
1497 struct ieee80211_channel *channels[8];
1498 unsigned int num;
1499
1500 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1501
1502 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1503
1504 if (ifibss->fixed_channel) {
1505 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1506 &ifibss->chandef,
1507 channels,
1508 ARRAY_SIZE(channels));
1509 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1510 ifibss->ssid_len, channels,
1511 num, scan_width);
1512 } else {
1513 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1514 ifibss->ssid_len, NULL,
1515 0, scan_width);
1516 }
1517 } else {
1518 int interval = IEEE80211_SCAN_INTERVAL;
1519
1520 if (time_after(jiffies, ifibss->ibss_join_req +
1521 IEEE80211_IBSS_JOIN_TIMEOUT))
1522 ieee80211_sta_create_ibss(sdata);
1523
1524 mod_timer(&ifibss->timer,
1525 round_jiffies(jiffies + interval));
1526 }
1527 }
1528
ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data * sdata,struct sk_buff * req)1529 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1530 struct sk_buff *req)
1531 {
1532 struct ieee80211_mgmt *mgmt = (void *)req->data;
1533 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1534 struct ieee80211_local *local = sdata->local;
1535 int tx_last_beacon, len = req->len;
1536 struct sk_buff *skb;
1537 struct beacon_data *presp;
1538 u8 *pos, *end;
1539
1540 sdata_assert_lock(sdata);
1541
1542 presp = rcu_dereference_protected(ifibss->presp,
1543 lockdep_is_held(&sdata->wdev.mtx));
1544
1545 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1546 len < 24 + 2 || !presp)
1547 return;
1548
1549 tx_last_beacon = drv_tx_last_beacon(local);
1550
1551 ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
1552 ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n",
1553 mgmt->bssid, tx_last_beacon);
1554
1555 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1556 return;
1557
1558 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1559 !is_broadcast_ether_addr(mgmt->bssid))
1560 return;
1561
1562 end = ((u8 *) mgmt) + len;
1563 pos = mgmt->u.probe_req.variable;
1564 if (pos[0] != WLAN_EID_SSID ||
1565 pos + 2 + pos[1] > end) {
1566 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1567 mgmt->sa);
1568 return;
1569 }
1570 if (pos[1] != 0 &&
1571 (pos[1] != ifibss->ssid_len ||
1572 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1573 /* Ignore ProbeReq for foreign SSID */
1574 return;
1575 }
1576
1577 /* Reply with ProbeResp */
1578 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1579 if (!skb)
1580 return;
1581
1582 skb_reserve(skb, local->tx_headroom);
1583 skb_put_data(skb, presp->head, presp->head_len);
1584
1585 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1586 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1587 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1588
1589 /* avoid excessive retries for probe request to wildcard SSIDs */
1590 if (pos[1] == 0)
1591 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1592
1593 ieee80211_tx_skb(sdata, skb);
1594 }
1595
1596 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)1597 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1598 struct ieee80211_mgmt *mgmt, size_t len,
1599 struct ieee80211_rx_status *rx_status)
1600 {
1601 size_t baselen;
1602 struct ieee802_11_elems elems;
1603
1604 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1605 offsetof(typeof(mgmt->u.beacon), variable));
1606
1607 /*
1608 * either beacon or probe_resp but the variable field is at the
1609 * same offset
1610 */
1611 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1612 if (baselen > len)
1613 return;
1614
1615 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1616 false, &elems, mgmt->bssid, NULL);
1617
1618 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1619 }
1620
ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1621 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1622 struct sk_buff *skb)
1623 {
1624 struct ieee80211_rx_status *rx_status;
1625 struct ieee80211_mgmt *mgmt;
1626 u16 fc;
1627 struct ieee802_11_elems elems;
1628 int ies_len;
1629
1630 rx_status = IEEE80211_SKB_RXCB(skb);
1631 mgmt = (struct ieee80211_mgmt *) skb->data;
1632 fc = le16_to_cpu(mgmt->frame_control);
1633
1634 sdata_lock(sdata);
1635
1636 if (!sdata->u.ibss.ssid_len)
1637 goto mgmt_out; /* not ready to merge yet */
1638
1639 switch (fc & IEEE80211_FCTL_STYPE) {
1640 case IEEE80211_STYPE_PROBE_REQ:
1641 ieee80211_rx_mgmt_probe_req(sdata, skb);
1642 break;
1643 case IEEE80211_STYPE_PROBE_RESP:
1644 case IEEE80211_STYPE_BEACON:
1645 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1646 rx_status);
1647 break;
1648 case IEEE80211_STYPE_AUTH:
1649 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1650 break;
1651 case IEEE80211_STYPE_DEAUTH:
1652 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1653 break;
1654 case IEEE80211_STYPE_ACTION:
1655 switch (mgmt->u.action.category) {
1656 case WLAN_CATEGORY_SPECTRUM_MGMT:
1657 ies_len = skb->len -
1658 offsetof(struct ieee80211_mgmt,
1659 u.action.u.chan_switch.variable);
1660
1661 if (ies_len < 0)
1662 break;
1663
1664 ieee802_11_parse_elems(
1665 mgmt->u.action.u.chan_switch.variable,
1666 ies_len, true, &elems, mgmt->bssid, NULL);
1667
1668 if (elems.parse_error)
1669 break;
1670
1671 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1672 rx_status, &elems);
1673 break;
1674 }
1675 }
1676
1677 mgmt_out:
1678 sdata_unlock(sdata);
1679 }
1680
ieee80211_ibss_work(struct ieee80211_sub_if_data * sdata)1681 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1682 {
1683 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1684 struct sta_info *sta;
1685
1686 sdata_lock(sdata);
1687
1688 /*
1689 * Work could be scheduled after scan or similar
1690 * when we aren't even joined (or trying) with a
1691 * network.
1692 */
1693 if (!ifibss->ssid_len)
1694 goto out;
1695
1696 spin_lock_bh(&ifibss->incomplete_lock);
1697 while (!list_empty(&ifibss->incomplete_stations)) {
1698 sta = list_first_entry(&ifibss->incomplete_stations,
1699 struct sta_info, list);
1700 list_del(&sta->list);
1701 spin_unlock_bh(&ifibss->incomplete_lock);
1702
1703 ieee80211_ibss_finish_sta(sta);
1704 rcu_read_unlock();
1705 spin_lock_bh(&ifibss->incomplete_lock);
1706 }
1707 spin_unlock_bh(&ifibss->incomplete_lock);
1708
1709 switch (ifibss->state) {
1710 case IEEE80211_IBSS_MLME_SEARCH:
1711 ieee80211_sta_find_ibss(sdata);
1712 break;
1713 case IEEE80211_IBSS_MLME_JOINED:
1714 ieee80211_sta_merge_ibss(sdata);
1715 break;
1716 default:
1717 WARN_ON(1);
1718 break;
1719 }
1720
1721 out:
1722 sdata_unlock(sdata);
1723 }
1724
ieee80211_ibss_timer(struct timer_list * t)1725 static void ieee80211_ibss_timer(struct timer_list *t)
1726 {
1727 struct ieee80211_sub_if_data *sdata =
1728 from_timer(sdata, t, u.ibss.timer);
1729
1730 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1731 }
1732
ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data * sdata)1733 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1734 {
1735 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1736
1737 timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0);
1738 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1739 spin_lock_init(&ifibss->incomplete_lock);
1740 INIT_WORK(&ifibss->csa_connection_drop_work,
1741 ieee80211_csa_connection_drop_work);
1742 }
1743
1744 /* scan finished notification */
ieee80211_ibss_notify_scan_completed(struct ieee80211_local * local)1745 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1746 {
1747 struct ieee80211_sub_if_data *sdata;
1748
1749 mutex_lock(&local->iflist_mtx);
1750 list_for_each_entry(sdata, &local->interfaces, list) {
1751 if (!ieee80211_sdata_running(sdata))
1752 continue;
1753 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1754 continue;
1755 sdata->u.ibss.last_scan_completed = jiffies;
1756 }
1757 mutex_unlock(&local->iflist_mtx);
1758 }
1759
ieee80211_ibss_join(struct ieee80211_sub_if_data * sdata,struct cfg80211_ibss_params * params)1760 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1761 struct cfg80211_ibss_params *params)
1762 {
1763 u32 changed = 0;
1764 u32 rate_flags;
1765 struct ieee80211_supported_band *sband;
1766 enum ieee80211_chanctx_mode chanmode;
1767 struct ieee80211_local *local = sdata->local;
1768 int radar_detect_width = 0;
1769 int i;
1770 int ret;
1771
1772 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1773 ¶ms->chandef,
1774 sdata->wdev.iftype);
1775 if (ret < 0)
1776 return ret;
1777
1778 if (ret > 0) {
1779 if (!params->userspace_handles_dfs)
1780 return -EINVAL;
1781 radar_detect_width = BIT(params->chandef.width);
1782 }
1783
1784 chanmode = (params->channel_fixed && !ret) ?
1785 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1786
1787 mutex_lock(&local->chanctx_mtx);
1788 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode,
1789 radar_detect_width);
1790 mutex_unlock(&local->chanctx_mtx);
1791 if (ret < 0)
1792 return ret;
1793
1794 if (params->bssid) {
1795 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1796 sdata->u.ibss.fixed_bssid = true;
1797 } else
1798 sdata->u.ibss.fixed_bssid = false;
1799
1800 sdata->u.ibss.privacy = params->privacy;
1801 sdata->u.ibss.control_port = params->control_port;
1802 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1803 sdata->u.ibss.basic_rates = params->basic_rates;
1804 sdata->u.ibss.last_scan_completed = jiffies;
1805
1806 /* fix basic_rates if channel does not support these rates */
1807 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef);
1808 sband = local->hw.wiphy->bands[params->chandef.chan->band];
1809 for (i = 0; i < sband->n_bitrates; i++) {
1810 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1811 sdata->u.ibss.basic_rates &= ~BIT(i);
1812 }
1813 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1814 sizeof(params->mcast_rate));
1815
1816 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1817
1818 sdata->u.ibss.chandef = params->chandef;
1819 sdata->u.ibss.fixed_channel = params->channel_fixed;
1820
1821 if (params->ie) {
1822 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1823 GFP_KERNEL);
1824 if (sdata->u.ibss.ie)
1825 sdata->u.ibss.ie_len = params->ie_len;
1826 }
1827
1828 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1829 sdata->u.ibss.ibss_join_req = jiffies;
1830
1831 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1832 sdata->u.ibss.ssid_len = params->ssid_len;
1833
1834 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa,
1835 sizeof(sdata->u.ibss.ht_capa));
1836 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask,
1837 sizeof(sdata->u.ibss.ht_capa_mask));
1838
1839 /*
1840 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1841 * reserved, but an HT STA shall protect HT transmissions as though
1842 * the HT Protection field were set to non-HT mixed mode.
1843 *
1844 * In an IBSS, the RIFS Mode field of the HT Operation element is
1845 * also reserved, but an HT STA shall operate as though this field
1846 * were set to 1.
1847 */
1848
1849 sdata->vif.bss_conf.ht_operation_mode |=
1850 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1851 | IEEE80211_HT_PARAM_RIFS_MODE;
1852
1853 changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE;
1854 ieee80211_bss_info_change_notify(sdata, changed);
1855
1856 sdata->smps_mode = IEEE80211_SMPS_OFF;
1857 sdata->needed_rx_chains = local->rx_chains;
1858 sdata->control_port_over_nl80211 = params->control_port_over_nl80211;
1859
1860 ieee80211_queue_work(&local->hw, &sdata->work);
1861
1862 return 0;
1863 }
1864
ieee80211_ibss_leave(struct ieee80211_sub_if_data * sdata)1865 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1866 {
1867 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1868
1869 ieee80211_ibss_disconnect(sdata);
1870 ifibss->ssid_len = 0;
1871 eth_zero_addr(ifibss->bssid);
1872
1873 /* remove beacon */
1874 kfree(sdata->u.ibss.ie);
1875 sdata->u.ibss.ie = NULL;
1876 sdata->u.ibss.ie_len = 0;
1877
1878 /* on the next join, re-program HT parameters */
1879 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1880 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1881
1882 synchronize_rcu();
1883
1884 skb_queue_purge(&sdata->skb_queue);
1885
1886 del_timer_sync(&sdata->u.ibss.timer);
1887
1888 return 0;
1889 }
1890