1 /*
2 * IBSS mode implementation
3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 * Copyright 2009, Johannes Berg <johannes@sipsolutions.net>
9 * Copyright 2013-2014 Intel Mobile Communications GmbH
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 */
15
16 #include <linux/delay.h>
17 #include <linux/slab.h>
18 #include <linux/if_ether.h>
19 #include <linux/skbuff.h>
20 #include <linux/if_arp.h>
21 #include <linux/etherdevice.h>
22 #include <linux/rtnetlink.h>
23 #include <net/mac80211.h>
24
25 #include "ieee80211_i.h"
26 #include "driver-ops.h"
27 #include "rate.h"
28
29 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
30 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
31
32 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
33 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
34 #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ)
35
36 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
37
38 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)39 ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata,
40 const int beacon_int, const u32 basic_rates,
41 const u16 capability, u64 tsf,
42 struct cfg80211_chan_def *chandef,
43 bool *have_higher_than_11mbit,
44 struct cfg80211_csa_settings *csa_settings)
45 {
46 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
47 struct ieee80211_local *local = sdata->local;
48 int rates_n = 0, i, ri;
49 struct ieee80211_mgmt *mgmt;
50 u8 *pos;
51 struct ieee80211_supported_band *sband;
52 u32 rate_flags, rates = 0, rates_added = 0;
53 struct beacon_data *presp;
54 int frame_len;
55 int shift;
56
57 /* Build IBSS probe response */
58 frame_len = sizeof(struct ieee80211_hdr_3addr) +
59 12 /* struct ieee80211_mgmt.u.beacon */ +
60 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
61 2 + 8 /* max Supported Rates */ +
62 3 /* max DS params */ +
63 4 /* IBSS params */ +
64 5 /* Channel Switch Announcement */ +
65 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
66 2 + sizeof(struct ieee80211_ht_cap) +
67 2 + sizeof(struct ieee80211_ht_operation) +
68 ifibss->ie_len;
69 presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
70 if (!presp)
71 return NULL;
72
73 presp->head = (void *)(presp + 1);
74
75 mgmt = (void *) presp->head;
76 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
77 IEEE80211_STYPE_PROBE_RESP);
78 eth_broadcast_addr(mgmt->da);
79 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
80 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
81 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
82 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
83 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
84
85 pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
86
87 *pos++ = WLAN_EID_SSID;
88 *pos++ = ifibss->ssid_len;
89 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
90 pos += ifibss->ssid_len;
91
92 sband = local->hw.wiphy->bands[chandef->chan->band];
93 rate_flags = ieee80211_chandef_rate_flags(chandef);
94 shift = ieee80211_chandef_get_shift(chandef);
95 rates_n = 0;
96 if (have_higher_than_11mbit)
97 *have_higher_than_11mbit = false;
98
99 for (i = 0; i < sband->n_bitrates; i++) {
100 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
101 continue;
102 if (sband->bitrates[i].bitrate > 110 &&
103 have_higher_than_11mbit)
104 *have_higher_than_11mbit = true;
105
106 rates |= BIT(i);
107 rates_n++;
108 }
109
110 *pos++ = WLAN_EID_SUPP_RATES;
111 *pos++ = min_t(int, 8, rates_n);
112 for (ri = 0; ri < sband->n_bitrates; ri++) {
113 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
114 5 * (1 << shift));
115 u8 basic = 0;
116 if (!(rates & BIT(ri)))
117 continue;
118
119 if (basic_rates & BIT(ri))
120 basic = 0x80;
121 *pos++ = basic | (u8) rate;
122 if (++rates_added == 8) {
123 ri++; /* continue at next rate for EXT_SUPP_RATES */
124 break;
125 }
126 }
127
128 if (sband->band == IEEE80211_BAND_2GHZ) {
129 *pos++ = WLAN_EID_DS_PARAMS;
130 *pos++ = 1;
131 *pos++ = ieee80211_frequency_to_channel(
132 chandef->chan->center_freq);
133 }
134
135 *pos++ = WLAN_EID_IBSS_PARAMS;
136 *pos++ = 2;
137 /* FIX: set ATIM window based on scan results */
138 *pos++ = 0;
139 *pos++ = 0;
140
141 if (csa_settings) {
142 *pos++ = WLAN_EID_CHANNEL_SWITCH;
143 *pos++ = 3;
144 *pos++ = csa_settings->block_tx ? 1 : 0;
145 *pos++ = ieee80211_frequency_to_channel(
146 csa_settings->chandef.chan->center_freq);
147 presp->csa_counter_offsets[0] = (pos - presp->head);
148 *pos++ = csa_settings->count;
149 presp->csa_current_counter = csa_settings->count;
150 }
151
152 /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
153 if (rates_n > 8) {
154 *pos++ = WLAN_EID_EXT_SUPP_RATES;
155 *pos++ = rates_n - 8;
156 for (; ri < sband->n_bitrates; ri++) {
157 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
158 5 * (1 << shift));
159 u8 basic = 0;
160 if (!(rates & BIT(ri)))
161 continue;
162
163 if (basic_rates & BIT(ri))
164 basic = 0x80;
165 *pos++ = basic | (u8) rate;
166 }
167 }
168
169 if (ifibss->ie_len) {
170 memcpy(pos, ifibss->ie, ifibss->ie_len);
171 pos += ifibss->ie_len;
172 }
173
174 /* add HT capability and information IEs */
175 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
176 chandef->width != NL80211_CHAN_WIDTH_5 &&
177 chandef->width != NL80211_CHAN_WIDTH_10 &&
178 sband->ht_cap.ht_supported) {
179 struct ieee80211_sta_ht_cap ht_cap;
180
181 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
182 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
183
184 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
185 /*
186 * Note: According to 802.11n-2009 9.13.3.1, HT Protection
187 * field and RIFS Mode are reserved in IBSS mode, therefore
188 * keep them at 0
189 */
190 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
191 chandef, 0);
192
193 /* add VHT capability and information IEs */
194 if (chandef->width != NL80211_CHAN_WIDTH_20 &&
195 chandef->width != NL80211_CHAN_WIDTH_40 &&
196 sband->vht_cap.vht_supported) {
197 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
198 sband->vht_cap.cap);
199 pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap,
200 chandef);
201 }
202 }
203
204 if (local->hw.queues >= IEEE80211_NUM_ACS)
205 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */
206
207 presp->head_len = pos - presp->head;
208 if (WARN_ON(presp->head_len > frame_len))
209 goto error;
210
211 return presp;
212 error:
213 kfree(presp);
214 return NULL;
215 }
216
__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)217 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
218 const u8 *bssid, const int beacon_int,
219 struct cfg80211_chan_def *req_chandef,
220 const u32 basic_rates,
221 const u16 capability, u64 tsf,
222 bool creator)
223 {
224 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
225 struct ieee80211_local *local = sdata->local;
226 struct ieee80211_mgmt *mgmt;
227 struct cfg80211_bss *bss;
228 u32 bss_change;
229 struct cfg80211_chan_def chandef;
230 struct ieee80211_channel *chan;
231 struct beacon_data *presp;
232 enum nl80211_bss_scan_width scan_width;
233 bool have_higher_than_11mbit;
234 bool radar_required;
235 int err;
236
237 sdata_assert_lock(sdata);
238
239 /* Reset own TSF to allow time synchronization work. */
240 drv_reset_tsf(local, sdata);
241
242 if (!ether_addr_equal(ifibss->bssid, bssid))
243 sta_info_flush(sdata);
244
245 /* if merging, indicate to driver that we leave the old IBSS */
246 if (sdata->vif.bss_conf.ibss_joined) {
247 sdata->vif.bss_conf.ibss_joined = false;
248 sdata->vif.bss_conf.ibss_creator = false;
249 sdata->vif.bss_conf.enable_beacon = false;
250 netif_carrier_off(sdata->dev);
251 ieee80211_bss_info_change_notify(sdata,
252 BSS_CHANGED_IBSS |
253 BSS_CHANGED_BEACON_ENABLED);
254 drv_leave_ibss(local, sdata);
255 }
256
257 presp = rcu_dereference_protected(ifibss->presp,
258 lockdep_is_held(&sdata->wdev.mtx));
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_vif_use_channel(sdata, &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->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.bss_conf.ssid_len = ifibss->ssid_len;
329 memcpy(sdata->vif.bss_conf.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 == IEEE80211_BAND_5GHZ;
351 bss_change |= BSS_CHANGED_ERP_SLOT;
352
353 /* cf. IEEE 802.11 9.2.12 */
354 if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit)
355 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
356 else
357 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
358
359 ieee80211_set_wmm_default(sdata, true);
360
361 sdata->vif.bss_conf.ibss_joined = true;
362 sdata->vif.bss_conf.ibss_creator = creator;
363
364 err = drv_join_ibss(local, sdata);
365 if (err) {
366 sdata->vif.bss_conf.ibss_joined = false;
367 sdata->vif.bss_conf.ibss_creator = false;
368 sdata->vif.bss_conf.enable_beacon = false;
369 sdata->vif.bss_conf.ssid_len = 0;
370 RCU_INIT_POINTER(ifibss->presp, NULL);
371 kfree_rcu(presp, rcu_head);
372 mutex_lock(&local->mtx);
373 ieee80211_vif_release_channel(sdata);
374 mutex_unlock(&local->mtx);
375 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
376 err);
377 return;
378 }
379
380 ieee80211_bss_info_change_notify(sdata, bss_change);
381
382 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
383 mod_timer(&ifibss->timer,
384 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
385
386 scan_width = cfg80211_chandef_to_scan_width(&chandef);
387 bss = cfg80211_inform_bss_width_frame(local->hw.wiphy, chan,
388 scan_width, mgmt,
389 presp->head_len, 0, GFP_KERNEL);
390 cfg80211_put_bss(local->hw.wiphy, bss);
391 netif_carrier_on(sdata->dev);
392 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
393 }
394
ieee80211_sta_join_ibss(struct ieee80211_sub_if_data * sdata,struct ieee80211_bss * bss)395 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
396 struct ieee80211_bss *bss)
397 {
398 struct cfg80211_bss *cbss =
399 container_of((void *)bss, struct cfg80211_bss, priv);
400 struct ieee80211_supported_band *sband;
401 struct cfg80211_chan_def chandef;
402 u32 basic_rates;
403 int i, j;
404 u16 beacon_int = cbss->beacon_interval;
405 const struct cfg80211_bss_ies *ies;
406 enum nl80211_channel_type chan_type;
407 u64 tsf;
408 u32 rate_flags;
409 int shift;
410
411 sdata_assert_lock(sdata);
412
413 if (beacon_int < 10)
414 beacon_int = 10;
415
416 switch (sdata->u.ibss.chandef.width) {
417 case NL80211_CHAN_WIDTH_20_NOHT:
418 case NL80211_CHAN_WIDTH_20:
419 case NL80211_CHAN_WIDTH_40:
420 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
421 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
422 break;
423 case NL80211_CHAN_WIDTH_5:
424 case NL80211_CHAN_WIDTH_10:
425 cfg80211_chandef_create(&chandef, cbss->channel,
426 NL80211_CHAN_WIDTH_20_NOHT);
427 chandef.width = sdata->u.ibss.chandef.width;
428 break;
429 case NL80211_CHAN_WIDTH_80:
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_WIDTH_20_NOHT);
438 break;
439 }
440
441 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
442 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
443 shift = ieee80211_vif_get_shift(&sdata->vif);
444
445 basic_rates = 0;
446
447 for (i = 0; i < bss->supp_rates_len; i++) {
448 int rate = bss->supp_rates[i] & 0x7f;
449 bool is_basic = !!(bss->supp_rates[i] & 0x80);
450
451 for (j = 0; j < sband->n_bitrates; j++) {
452 int brate;
453 if ((rate_flags & sband->bitrates[j].flags)
454 != rate_flags)
455 continue;
456
457 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
458 5 * (1 << shift));
459 if (brate == rate) {
460 if (is_basic)
461 basic_rates |= BIT(j);
462 break;
463 }
464 }
465 }
466
467 rcu_read_lock();
468 ies = rcu_dereference(cbss->ies);
469 tsf = ies->tsf;
470 rcu_read_unlock();
471
472 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
473 beacon_int,
474 &chandef,
475 basic_rates,
476 cbss->capability,
477 tsf, false);
478 }
479
ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data * sdata,struct cfg80211_csa_settings * csa_settings)480 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
481 struct cfg80211_csa_settings *csa_settings)
482 {
483 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
484 struct beacon_data *presp, *old_presp;
485 struct cfg80211_bss *cbss;
486 const struct cfg80211_bss_ies *ies;
487 u16 capability = 0;
488 u64 tsf;
489 int ret = 0;
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 ret = -EINVAL;
503 goto out;
504 }
505
506 rcu_read_lock();
507 ies = rcu_dereference(cbss->ies);
508 tsf = ies->tsf;
509 rcu_read_unlock();
510 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
511
512 old_presp = rcu_dereference_protected(ifibss->presp,
513 lockdep_is_held(&sdata->wdev.mtx));
514
515 presp = ieee80211_ibss_build_presp(sdata,
516 sdata->vif.bss_conf.beacon_int,
517 sdata->vif.bss_conf.basic_rates,
518 capability, tsf, &ifibss->chandef,
519 NULL, csa_settings);
520 if (!presp) {
521 ret = -ENOMEM;
522 goto out;
523 }
524
525 rcu_assign_pointer(ifibss->presp, presp);
526 if (old_presp)
527 kfree_rcu(old_presp, rcu_head);
528
529 return BSS_CHANGED_BEACON;
530 out:
531 return ret;
532 }
533
ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data * sdata)534 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
535 {
536 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
537 struct cfg80211_bss *cbss;
538 int err, changed = 0;
539
540 sdata_assert_lock(sdata);
541
542 /* update cfg80211 bss information with the new channel */
543 if (!is_zero_ether_addr(ifibss->bssid)) {
544 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
545 ifibss->chandef.chan,
546 ifibss->bssid, ifibss->ssid,
547 ifibss->ssid_len,
548 IEEE80211_BSS_TYPE_IBSS,
549 IEEE80211_PRIVACY(ifibss->privacy));
550 /* XXX: should not really modify cfg80211 data */
551 if (cbss) {
552 cbss->channel = sdata->csa_chandef.chan;
553 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
554 }
555 }
556
557 ifibss->chandef = sdata->csa_chandef;
558
559 /* generate the beacon */
560 err = ieee80211_ibss_csa_beacon(sdata, NULL);
561 if (err < 0)
562 return err;
563
564 changed |= err;
565
566 return changed;
567 }
568
ieee80211_ibss_stop(struct ieee80211_sub_if_data * sdata)569 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
570 {
571 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
572
573 cancel_work_sync(&ifibss->csa_connection_drop_work);
574 }
575
ieee80211_ibss_finish_sta(struct sta_info * sta)576 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
577 __acquires(RCU)
578 {
579 struct ieee80211_sub_if_data *sdata = sta->sdata;
580 u8 addr[ETH_ALEN];
581
582 memcpy(addr, sta->sta.addr, ETH_ALEN);
583
584 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
585
586 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
587 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
588 /* authorize the station only if the network is not RSN protected. If
589 * not wait for the userspace to authorize it */
590 if (!sta->sdata->u.ibss.control_port)
591 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
592
593 rate_control_rate_init(sta);
594
595 /* If it fails, maybe we raced another insertion? */
596 if (sta_info_insert_rcu(sta))
597 return sta_info_get(sdata, addr);
598 return sta;
599 }
600
601 static struct sta_info *
ieee80211_ibss_add_sta(struct ieee80211_sub_if_data * sdata,const u8 * bssid,const u8 * addr,u32 supp_rates)602 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
603 const u8 *addr, u32 supp_rates)
604 __acquires(RCU)
605 {
606 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
607 struct ieee80211_local *local = sdata->local;
608 struct sta_info *sta;
609 struct ieee80211_chanctx_conf *chanctx_conf;
610 struct ieee80211_supported_band *sband;
611 enum nl80211_bss_scan_width scan_width;
612 int band;
613
614 /*
615 * XXX: Consider removing the least recently used entry and
616 * allow new one to be added.
617 */
618 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
619 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
620 sdata->name, addr);
621 rcu_read_lock();
622 return NULL;
623 }
624
625 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
626 rcu_read_lock();
627 return NULL;
628 }
629
630 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
631 rcu_read_lock();
632 return NULL;
633 }
634
635 rcu_read_lock();
636 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
637 if (WARN_ON_ONCE(!chanctx_conf))
638 return NULL;
639 band = chanctx_conf->def.chan->band;
640 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
641 rcu_read_unlock();
642
643 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
644 if (!sta) {
645 rcu_read_lock();
646 return NULL;
647 }
648
649 sta->last_rx = jiffies;
650
651 /* make sure mandatory rates are always added */
652 sband = local->hw.wiphy->bands[band];
653 sta->sta.supp_rates[band] = supp_rates |
654 ieee80211_mandatory_rates(sband, scan_width);
655
656 return ieee80211_ibss_finish_sta(sta);
657 }
658
ieee80211_sta_active_ibss(struct ieee80211_sub_if_data * sdata)659 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
660 {
661 struct ieee80211_local *local = sdata->local;
662 int active = 0;
663 struct sta_info *sta;
664
665 sdata_assert_lock(sdata);
666
667 rcu_read_lock();
668
669 list_for_each_entry_rcu(sta, &local->sta_list, list) {
670 if (sta->sdata == sdata &&
671 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
672 jiffies)) {
673 active++;
674 break;
675 }
676 }
677
678 rcu_read_unlock();
679
680 return active;
681 }
682
ieee80211_ibss_disconnect(struct ieee80211_sub_if_data * sdata)683 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
684 {
685 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
686 struct ieee80211_local *local = sdata->local;
687 struct cfg80211_bss *cbss;
688 struct beacon_data *presp;
689 struct sta_info *sta;
690
691 if (!is_zero_ether_addr(ifibss->bssid)) {
692 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
693 ifibss->bssid, ifibss->ssid,
694 ifibss->ssid_len,
695 IEEE80211_BSS_TYPE_IBSS,
696 IEEE80211_PRIVACY(ifibss->privacy));
697
698 if (cbss) {
699 cfg80211_unlink_bss(local->hw.wiphy, cbss);
700 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
701 }
702 }
703
704 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
705
706 sta_info_flush(sdata);
707
708 spin_lock_bh(&ifibss->incomplete_lock);
709 while (!list_empty(&ifibss->incomplete_stations)) {
710 sta = list_first_entry(&ifibss->incomplete_stations,
711 struct sta_info, list);
712 list_del(&sta->list);
713 spin_unlock_bh(&ifibss->incomplete_lock);
714
715 sta_info_free(local, sta);
716 spin_lock_bh(&ifibss->incomplete_lock);
717 }
718 spin_unlock_bh(&ifibss->incomplete_lock);
719
720 netif_carrier_off(sdata->dev);
721
722 sdata->vif.bss_conf.ibss_joined = false;
723 sdata->vif.bss_conf.ibss_creator = false;
724 sdata->vif.bss_conf.enable_beacon = false;
725 sdata->vif.bss_conf.ssid_len = 0;
726
727 /* remove beacon */
728 presp = rcu_dereference_protected(ifibss->presp,
729 lockdep_is_held(&sdata->wdev.mtx));
730 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
731 if (presp)
732 kfree_rcu(presp, rcu_head);
733
734 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
735 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
736 BSS_CHANGED_IBSS);
737 drv_leave_ibss(local, sdata);
738 mutex_lock(&local->mtx);
739 ieee80211_vif_release_channel(sdata);
740 mutex_unlock(&local->mtx);
741 }
742
ieee80211_csa_connection_drop_work(struct work_struct * work)743 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
744 {
745 struct ieee80211_sub_if_data *sdata =
746 container_of(work, struct ieee80211_sub_if_data,
747 u.ibss.csa_connection_drop_work);
748
749 sdata_lock(sdata);
750
751 ieee80211_ibss_disconnect(sdata);
752 synchronize_rcu();
753 skb_queue_purge(&sdata->skb_queue);
754
755 /* trigger a scan to find another IBSS network to join */
756 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
757
758 sdata_unlock(sdata);
759 }
760
ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data * sdata)761 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
762 {
763 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
764 int err;
765
766 /* if the current channel is a DFS channel, mark the channel as
767 * unavailable.
768 */
769 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
770 &ifibss->chandef,
771 NL80211_IFTYPE_ADHOC);
772 if (err > 0)
773 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
774 GFP_ATOMIC);
775 }
776
777 static bool
ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data * sdata,struct ieee802_11_elems * elems,bool beacon)778 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
779 struct ieee802_11_elems *elems,
780 bool beacon)
781 {
782 struct cfg80211_csa_settings params;
783 struct ieee80211_csa_ie csa_ie;
784 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
785 enum nl80211_channel_type ch_type;
786 int err;
787 u32 sta_flags;
788
789 sdata_assert_lock(sdata);
790
791 sta_flags = IEEE80211_STA_DISABLE_VHT;
792 switch (ifibss->chandef.width) {
793 case NL80211_CHAN_WIDTH_5:
794 case NL80211_CHAN_WIDTH_10:
795 case NL80211_CHAN_WIDTH_20_NOHT:
796 sta_flags |= IEEE80211_STA_DISABLE_HT;
797 /* fall through */
798 case NL80211_CHAN_WIDTH_20:
799 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
800 break;
801 default:
802 break;
803 }
804
805 memset(¶ms, 0, sizeof(params));
806 memset(&csa_ie, 0, sizeof(csa_ie));
807 err = ieee80211_parse_ch_switch_ie(sdata, elems,
808 ifibss->chandef.chan->band,
809 sta_flags, ifibss->bssid, &csa_ie);
810 /* can't switch to destination channel, fail */
811 if (err < 0)
812 goto disconnect;
813
814 /* did not contain a CSA */
815 if (err)
816 return false;
817
818 /* channel switch is not supported, disconnect */
819 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
820 goto disconnect;
821
822 params.count = csa_ie.count;
823 params.chandef = csa_ie.chandef;
824
825 switch (ifibss->chandef.width) {
826 case NL80211_CHAN_WIDTH_20_NOHT:
827 case NL80211_CHAN_WIDTH_20:
828 case NL80211_CHAN_WIDTH_40:
829 /* keep our current HT mode (HT20/HT40+/HT40-), even if
830 * another mode has been announced. The mode is not adopted
831 * within the beacon while doing CSA and we should therefore
832 * keep the mode which we announce.
833 */
834 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
835 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan,
836 ch_type);
837 break;
838 case NL80211_CHAN_WIDTH_5:
839 case NL80211_CHAN_WIDTH_10:
840 if (params.chandef.width != ifibss->chandef.width) {
841 sdata_info(sdata,
842 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
843 ifibss->bssid,
844 params.chandef.chan->center_freq,
845 params.chandef.width,
846 params.chandef.center_freq1,
847 params.chandef.center_freq2);
848 goto disconnect;
849 }
850 break;
851 default:
852 /* should not happen, sta_flags should prevent VHT modes. */
853 WARN_ON(1);
854 goto disconnect;
855 }
856
857 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef,
858 NL80211_IFTYPE_ADHOC)) {
859 sdata_info(sdata,
860 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
861 ifibss->bssid,
862 params.chandef.chan->center_freq,
863 params.chandef.width,
864 params.chandef.center_freq1,
865 params.chandef.center_freq2);
866 goto disconnect;
867 }
868
869 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
870 ¶ms.chandef,
871 NL80211_IFTYPE_ADHOC);
872 if (err < 0)
873 goto disconnect;
874 if (err > 0 && !ifibss->userspace_handles_dfs) {
875 /* IBSS-DFS only allowed with a control program */
876 goto disconnect;
877 }
878
879 params.radar_required = err;
880
881 if (cfg80211_chandef_identical(¶ms.chandef,
882 &sdata->vif.bss_conf.chandef)) {
883 ibss_dbg(sdata,
884 "received csa with an identical chandef, ignoring\n");
885 return true;
886 }
887
888 /* all checks done, now perform the channel switch. */
889 ibss_dbg(sdata,
890 "received channel switch announcement to go to channel %d MHz\n",
891 params.chandef.chan->center_freq);
892
893 params.block_tx = !!csa_ie.mode;
894
895 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
896 ¶ms))
897 goto disconnect;
898
899 ieee80211_ibss_csa_mark_radar(sdata);
900
901 return true;
902 disconnect:
903 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
904 ieee80211_queue_work(&sdata->local->hw,
905 &ifibss->csa_connection_drop_work);
906
907 ieee80211_ibss_csa_mark_radar(sdata);
908
909 return true;
910 }
911
912 static void
ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len,struct ieee80211_rx_status * rx_status,struct ieee802_11_elems * elems)913 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
914 struct ieee80211_mgmt *mgmt, size_t len,
915 struct ieee80211_rx_status *rx_status,
916 struct ieee802_11_elems *elems)
917 {
918 int required_len;
919
920 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
921 return;
922
923 /* CSA is the only action we handle for now */
924 if (mgmt->u.action.u.measurement.action_code !=
925 WLAN_ACTION_SPCT_CHL_SWITCH)
926 return;
927
928 required_len = IEEE80211_MIN_ACTION_SIZE +
929 sizeof(mgmt->u.action.u.chan_switch);
930 if (len < required_len)
931 return;
932
933 if (!sdata->vif.csa_active)
934 ieee80211_ibss_process_chanswitch(sdata, elems, false);
935 }
936
ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)937 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
938 struct ieee80211_mgmt *mgmt,
939 size_t len)
940 {
941 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
942
943 if (len < IEEE80211_DEAUTH_FRAME_LEN)
944 return;
945
946 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
947 mgmt->sa, mgmt->da, mgmt->bssid, reason);
948 sta_info_destroy_addr(sdata, mgmt->sa);
949 }
950
ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)951 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
952 struct ieee80211_mgmt *mgmt,
953 size_t len)
954 {
955 u16 auth_alg, auth_transaction;
956
957 sdata_assert_lock(sdata);
958
959 if (len < 24 + 6)
960 return;
961
962 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
963 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
964
965 ibss_dbg(sdata,
966 "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
967 mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
968
969 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
970 return;
971
972 /*
973 * IEEE 802.11 standard does not require authentication in IBSS
974 * networks and most implementations do not seem to use it.
975 * However, try to reply to authentication attempts if someone
976 * has actually implemented this.
977 */
978 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
979 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
980 }
981
ieee80211_update_sta_info(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len,struct ieee80211_rx_status * rx_status,struct ieee802_11_elems * elems,struct ieee80211_channel * channel)982 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
983 struct ieee80211_mgmt *mgmt, size_t len,
984 struct ieee80211_rx_status *rx_status,
985 struct ieee802_11_elems *elems,
986 struct ieee80211_channel *channel)
987 {
988 struct sta_info *sta;
989 enum ieee80211_band band = rx_status->band;
990 enum nl80211_bss_scan_width scan_width;
991 struct ieee80211_local *local = sdata->local;
992 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
993 bool rates_updated = false;
994 u32 supp_rates = 0;
995
996 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
997 return;
998
999 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
1000 return;
1001
1002 rcu_read_lock();
1003 sta = sta_info_get(sdata, mgmt->sa);
1004
1005 if (elems->supp_rates) {
1006 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1007 band, NULL);
1008 if (sta) {
1009 u32 prev_rates;
1010
1011 prev_rates = sta->sta.supp_rates[band];
1012 /* make sure mandatory rates are always added */
1013 scan_width = NL80211_BSS_CHAN_WIDTH_20;
1014 if (rx_status->flag & RX_FLAG_5MHZ)
1015 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1016 if (rx_status->flag & RX_FLAG_10MHZ)
1017 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1018
1019 sta->sta.supp_rates[band] = supp_rates |
1020 ieee80211_mandatory_rates(sband, scan_width);
1021 if (sta->sta.supp_rates[band] != prev_rates) {
1022 ibss_dbg(sdata,
1023 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1024 sta->sta.addr, prev_rates,
1025 sta->sta.supp_rates[band]);
1026 rates_updated = true;
1027 }
1028 } else {
1029 rcu_read_unlock();
1030 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1031 mgmt->sa, supp_rates);
1032 }
1033 }
1034
1035 if (sta && elems->wmm_info && local->hw.queues >= IEEE80211_NUM_ACS)
1036 sta->sta.wme = true;
1037
1038 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1039 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1040 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1041 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1042 /* we both use HT */
1043 struct ieee80211_ht_cap htcap_ie;
1044 struct cfg80211_chan_def chandef;
1045 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
1046
1047 ieee80211_ht_oper_to_chandef(channel,
1048 elems->ht_operation,
1049 &chandef);
1050
1051 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1052 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1053 &htcap_ie,
1054 sta);
1055
1056 if (elems->vht_operation && elems->vht_cap_elem &&
1057 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1058 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1059 /* we both use VHT */
1060 struct ieee80211_vht_cap cap_ie;
1061 struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap;
1062
1063 ieee80211_vht_oper_to_chandef(channel,
1064 elems->vht_operation,
1065 &chandef);
1066 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1067 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1068 &cap_ie, sta);
1069 if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap)))
1070 rates_updated |= true;
1071 }
1072
1073 if (bw != sta->sta.bandwidth)
1074 rates_updated |= true;
1075
1076 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1077 &chandef))
1078 WARN_ON_ONCE(1);
1079 }
1080
1081 if (sta && rates_updated) {
1082 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1083 u8 rx_nss = sta->sta.rx_nss;
1084
1085 /* Force rx_nss recalculation */
1086 sta->sta.rx_nss = 0;
1087 rate_control_rate_init(sta);
1088 if (sta->sta.rx_nss != rx_nss)
1089 changed |= IEEE80211_RC_NSS_CHANGED;
1090
1091 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1092 }
1093
1094 rcu_read_unlock();
1095 }
1096
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)1097 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1098 struct ieee80211_mgmt *mgmt, size_t len,
1099 struct ieee80211_rx_status *rx_status,
1100 struct ieee802_11_elems *elems)
1101 {
1102 struct ieee80211_local *local = sdata->local;
1103 struct cfg80211_bss *cbss;
1104 struct ieee80211_bss *bss;
1105 struct ieee80211_channel *channel;
1106 u64 beacon_timestamp, rx_timestamp;
1107 u32 supp_rates = 0;
1108 enum ieee80211_band band = rx_status->band;
1109
1110 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1111 if (!channel)
1112 return;
1113
1114 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1115
1116 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1117 channel);
1118 if (!bss)
1119 return;
1120
1121 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1122
1123 /* same for beacon and probe response */
1124 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1125
1126 /* check if we need to merge IBSS */
1127
1128 /* not an IBSS */
1129 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1130 goto put_bss;
1131
1132 /* different channel */
1133 if (sdata->u.ibss.fixed_channel &&
1134 sdata->u.ibss.chandef.chan != cbss->channel)
1135 goto put_bss;
1136
1137 /* different SSID */
1138 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1139 memcmp(elems->ssid, sdata->u.ibss.ssid,
1140 sdata->u.ibss.ssid_len))
1141 goto put_bss;
1142
1143 /* process channel switch */
1144 if (sdata->vif.csa_active ||
1145 ieee80211_ibss_process_chanswitch(sdata, elems, true))
1146 goto put_bss;
1147
1148 /* same BSSID */
1149 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1150 goto put_bss;
1151
1152 /* we use a fixed BSSID */
1153 if (sdata->u.ibss.fixed_bssid)
1154 goto put_bss;
1155
1156 if (ieee80211_have_rx_timestamp(rx_status)) {
1157 /* time when timestamp field was received */
1158 rx_timestamp =
1159 ieee80211_calculate_rx_timestamp(local, rx_status,
1160 len + FCS_LEN, 24);
1161 } else {
1162 /*
1163 * second best option: get current TSF
1164 * (will return -1 if not supported)
1165 */
1166 rx_timestamp = drv_get_tsf(local, sdata);
1167 }
1168
1169 ibss_dbg(sdata,
1170 "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1171 mgmt->sa, mgmt->bssid,
1172 (unsigned long long)rx_timestamp,
1173 (unsigned long long)beacon_timestamp,
1174 (unsigned long long)(rx_timestamp - beacon_timestamp),
1175 jiffies);
1176
1177 if (beacon_timestamp > rx_timestamp) {
1178 ibss_dbg(sdata,
1179 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1180 mgmt->bssid);
1181 ieee80211_sta_join_ibss(sdata, bss);
1182 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1183 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1184 supp_rates);
1185 rcu_read_unlock();
1186 }
1187
1188 put_bss:
1189 ieee80211_rx_bss_put(local, bss);
1190 }
1191
ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data * sdata,const u8 * bssid,const u8 * addr,u32 supp_rates)1192 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1193 const u8 *bssid, const u8 *addr,
1194 u32 supp_rates)
1195 {
1196 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1197 struct ieee80211_local *local = sdata->local;
1198 struct sta_info *sta;
1199 struct ieee80211_chanctx_conf *chanctx_conf;
1200 struct ieee80211_supported_band *sband;
1201 enum nl80211_bss_scan_width scan_width;
1202 int band;
1203
1204 /*
1205 * XXX: Consider removing the least recently used entry and
1206 * allow new one to be added.
1207 */
1208 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1209 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1210 sdata->name, addr);
1211 return;
1212 }
1213
1214 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1215 return;
1216
1217 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1218 return;
1219
1220 rcu_read_lock();
1221 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1222 if (WARN_ON_ONCE(!chanctx_conf)) {
1223 rcu_read_unlock();
1224 return;
1225 }
1226 band = chanctx_conf->def.chan->band;
1227 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1228 rcu_read_unlock();
1229
1230 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1231 if (!sta)
1232 return;
1233
1234 sta->last_rx = jiffies;
1235
1236 /* make sure mandatory rates are always added */
1237 sband = local->hw.wiphy->bands[band];
1238 sta->sta.supp_rates[band] = supp_rates |
1239 ieee80211_mandatory_rates(sband, scan_width);
1240
1241 spin_lock(&ifibss->incomplete_lock);
1242 list_add(&sta->list, &ifibss->incomplete_stations);
1243 spin_unlock(&ifibss->incomplete_lock);
1244 ieee80211_queue_work(&local->hw, &sdata->work);
1245 }
1246
ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data * sdata)1247 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1248 {
1249 struct ieee80211_local *local = sdata->local;
1250 struct sta_info *sta, *tmp;
1251 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1252 unsigned long exp_rsn_time = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1253
1254 mutex_lock(&local->sta_mtx);
1255
1256 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1257 if (sdata != sta->sdata)
1258 continue;
1259
1260 if (time_after(jiffies, sta->last_rx + exp_time) ||
1261 (time_after(jiffies, sta->last_rx + exp_rsn_time) &&
1262 sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1263 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1264 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1265 "not authorized " : "", sta->sta.addr);
1266
1267 WARN_ON(__sta_info_destroy(sta));
1268 }
1269 }
1270
1271 mutex_unlock(&local->sta_mtx);
1272 }
1273
1274 /*
1275 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1276 */
1277
ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data * sdata)1278 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1279 {
1280 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1281 enum nl80211_bss_scan_width scan_width;
1282
1283 sdata_assert_lock(sdata);
1284
1285 mod_timer(&ifibss->timer,
1286 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1287
1288 ieee80211_ibss_sta_expire(sdata);
1289
1290 if (time_before(jiffies, ifibss->last_scan_completed +
1291 IEEE80211_IBSS_MERGE_INTERVAL))
1292 return;
1293
1294 if (ieee80211_sta_active_ibss(sdata))
1295 return;
1296
1297 if (ifibss->fixed_channel)
1298 return;
1299
1300 sdata_info(sdata,
1301 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1302
1303 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1304 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1305 NULL, 0, scan_width);
1306 }
1307
ieee80211_sta_create_ibss(struct ieee80211_sub_if_data * sdata)1308 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1309 {
1310 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1311 u8 bssid[ETH_ALEN];
1312 u16 capability;
1313 int i;
1314
1315 sdata_assert_lock(sdata);
1316
1317 if (ifibss->fixed_bssid) {
1318 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1319 } else {
1320 /* Generate random, not broadcast, locally administered BSSID. Mix in
1321 * own MAC address to make sure that devices that do not have proper
1322 * random number generator get different BSSID. */
1323 get_random_bytes(bssid, ETH_ALEN);
1324 for (i = 0; i < ETH_ALEN; i++)
1325 bssid[i] ^= sdata->vif.addr[i];
1326 bssid[0] &= ~0x01;
1327 bssid[0] |= 0x02;
1328 }
1329
1330 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1331
1332 capability = WLAN_CAPABILITY_IBSS;
1333
1334 if (ifibss->privacy)
1335 capability |= WLAN_CAPABILITY_PRIVACY;
1336
1337 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1338 &ifibss->chandef, ifibss->basic_rates,
1339 capability, 0, true);
1340 }
1341
ibss_setup_channels(struct wiphy * wiphy,struct ieee80211_channel ** channels,unsigned int channels_max,u32 center_freq,u32 width)1342 static unsigned ibss_setup_channels(struct wiphy *wiphy,
1343 struct ieee80211_channel **channels,
1344 unsigned int channels_max,
1345 u32 center_freq, u32 width)
1346 {
1347 struct ieee80211_channel *chan = NULL;
1348 unsigned int n_chan = 0;
1349 u32 start_freq, end_freq, freq;
1350
1351 if (width <= 20) {
1352 start_freq = center_freq;
1353 end_freq = center_freq;
1354 } else {
1355 start_freq = center_freq - width / 2 + 10;
1356 end_freq = center_freq + width / 2 - 10;
1357 }
1358
1359 for (freq = start_freq; freq <= end_freq; freq += 20) {
1360 chan = ieee80211_get_channel(wiphy, freq);
1361 if (!chan)
1362 continue;
1363 if (n_chan >= channels_max)
1364 return n_chan;
1365
1366 channels[n_chan] = chan;
1367 n_chan++;
1368 }
1369
1370 return n_chan;
1371 }
1372
1373 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)1374 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1375 const struct cfg80211_chan_def *chandef,
1376 struct ieee80211_channel **channels,
1377 unsigned int channels_max)
1378 {
1379 unsigned int n_chan = 0;
1380 u32 width, cf1, cf2 = 0;
1381
1382 switch (chandef->width) {
1383 case NL80211_CHAN_WIDTH_40:
1384 width = 40;
1385 break;
1386 case NL80211_CHAN_WIDTH_80P80:
1387 cf2 = chandef->center_freq2;
1388 /* fall through */
1389 case NL80211_CHAN_WIDTH_80:
1390 width = 80;
1391 break;
1392 case NL80211_CHAN_WIDTH_160:
1393 width = 160;
1394 break;
1395 default:
1396 width = 20;
1397 break;
1398 }
1399
1400 cf1 = chandef->center_freq1;
1401
1402 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1403
1404 if (cf2)
1405 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1406 channels_max - n_chan, cf2,
1407 width);
1408
1409 return n_chan;
1410 }
1411
1412 /*
1413 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1414 */
1415
ieee80211_sta_find_ibss(struct ieee80211_sub_if_data * sdata)1416 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1417 {
1418 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1419 struct ieee80211_local *local = sdata->local;
1420 struct cfg80211_bss *cbss;
1421 struct ieee80211_channel *chan = NULL;
1422 const u8 *bssid = NULL;
1423 enum nl80211_bss_scan_width scan_width;
1424 int active_ibss;
1425
1426 sdata_assert_lock(sdata);
1427
1428 active_ibss = ieee80211_sta_active_ibss(sdata);
1429 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1430
1431 if (active_ibss)
1432 return;
1433
1434 if (ifibss->fixed_bssid)
1435 bssid = ifibss->bssid;
1436 if (ifibss->fixed_channel)
1437 chan = ifibss->chandef.chan;
1438 if (!is_zero_ether_addr(ifibss->bssid))
1439 bssid = ifibss->bssid;
1440 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1441 ifibss->ssid, ifibss->ssid_len,
1442 IEEE80211_BSS_TYPE_IBSS,
1443 IEEE80211_PRIVACY(ifibss->privacy));
1444
1445 if (cbss) {
1446 struct ieee80211_bss *bss;
1447
1448 bss = (void *)cbss->priv;
1449 ibss_dbg(sdata,
1450 "sta_find_ibss: selected %pM current %pM\n",
1451 cbss->bssid, ifibss->bssid);
1452 sdata_info(sdata,
1453 "Selected IBSS BSSID %pM based on configured SSID\n",
1454 cbss->bssid);
1455
1456 ieee80211_sta_join_ibss(sdata, bss);
1457 ieee80211_rx_bss_put(local, bss);
1458 return;
1459 }
1460
1461 /* if a fixed bssid and a fixed freq have been provided create the IBSS
1462 * directly and do not waste time scanning
1463 */
1464 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1465 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1466 bssid);
1467 ieee80211_sta_create_ibss(sdata);
1468 return;
1469 }
1470
1471
1472 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1473
1474 /* Selected IBSS not found in current scan results - try to scan */
1475 if (time_after(jiffies, ifibss->last_scan_completed +
1476 IEEE80211_SCAN_INTERVAL)) {
1477 struct ieee80211_channel *channels[8];
1478 unsigned int num;
1479
1480 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1481
1482 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1483 &ifibss->chandef,
1484 channels,
1485 ARRAY_SIZE(channels));
1486 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1487 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1488 ifibss->ssid_len, channels, num,
1489 scan_width);
1490 } else {
1491 int interval = IEEE80211_SCAN_INTERVAL;
1492
1493 if (time_after(jiffies, ifibss->ibss_join_req +
1494 IEEE80211_IBSS_JOIN_TIMEOUT))
1495 ieee80211_sta_create_ibss(sdata);
1496
1497 mod_timer(&ifibss->timer,
1498 round_jiffies(jiffies + interval));
1499 }
1500 }
1501
ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data * sdata,struct sk_buff * req)1502 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1503 struct sk_buff *req)
1504 {
1505 struct ieee80211_mgmt *mgmt = (void *)req->data;
1506 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1507 struct ieee80211_local *local = sdata->local;
1508 int tx_last_beacon, len = req->len;
1509 struct sk_buff *skb;
1510 struct beacon_data *presp;
1511 u8 *pos, *end;
1512
1513 sdata_assert_lock(sdata);
1514
1515 presp = rcu_dereference_protected(ifibss->presp,
1516 lockdep_is_held(&sdata->wdev.mtx));
1517
1518 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1519 len < 24 + 2 || !presp)
1520 return;
1521
1522 tx_last_beacon = drv_tx_last_beacon(local);
1523
1524 ibss_dbg(sdata,
1525 "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
1526 mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
1527
1528 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1529 return;
1530
1531 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1532 !is_broadcast_ether_addr(mgmt->bssid))
1533 return;
1534
1535 end = ((u8 *) mgmt) + len;
1536 pos = mgmt->u.probe_req.variable;
1537 if (pos[0] != WLAN_EID_SSID ||
1538 pos + 2 + pos[1] > end) {
1539 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1540 mgmt->sa);
1541 return;
1542 }
1543 if (pos[1] != 0 &&
1544 (pos[1] != ifibss->ssid_len ||
1545 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1546 /* Ignore ProbeReq for foreign SSID */
1547 return;
1548 }
1549
1550 /* Reply with ProbeResp */
1551 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1552 if (!skb)
1553 return;
1554
1555 skb_reserve(skb, local->tx_headroom);
1556 memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
1557
1558 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1559 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1560 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1561
1562 /* avoid excessive retries for probe request to wildcard SSIDs */
1563 if (pos[1] == 0)
1564 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1565
1566 ieee80211_tx_skb(sdata, skb);
1567 }
1568
1569 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)1570 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1571 struct ieee80211_mgmt *mgmt, size_t len,
1572 struct ieee80211_rx_status *rx_status)
1573 {
1574 size_t baselen;
1575 struct ieee802_11_elems elems;
1576
1577 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1578 offsetof(typeof(mgmt->u.beacon), variable));
1579
1580 /*
1581 * either beacon or probe_resp but the variable field is at the
1582 * same offset
1583 */
1584 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1585 if (baselen > len)
1586 return;
1587
1588 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1589 false, &elems);
1590
1591 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1592 }
1593
ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1594 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1595 struct sk_buff *skb)
1596 {
1597 struct ieee80211_rx_status *rx_status;
1598 struct ieee80211_mgmt *mgmt;
1599 u16 fc;
1600 struct ieee802_11_elems elems;
1601 int ies_len;
1602
1603 rx_status = IEEE80211_SKB_RXCB(skb);
1604 mgmt = (struct ieee80211_mgmt *) skb->data;
1605 fc = le16_to_cpu(mgmt->frame_control);
1606
1607 sdata_lock(sdata);
1608
1609 if (!sdata->u.ibss.ssid_len)
1610 goto mgmt_out; /* not ready to merge yet */
1611
1612 switch (fc & IEEE80211_FCTL_STYPE) {
1613 case IEEE80211_STYPE_PROBE_REQ:
1614 ieee80211_rx_mgmt_probe_req(sdata, skb);
1615 break;
1616 case IEEE80211_STYPE_PROBE_RESP:
1617 case IEEE80211_STYPE_BEACON:
1618 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1619 rx_status);
1620 break;
1621 case IEEE80211_STYPE_AUTH:
1622 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1623 break;
1624 case IEEE80211_STYPE_DEAUTH:
1625 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1626 break;
1627 case IEEE80211_STYPE_ACTION:
1628 switch (mgmt->u.action.category) {
1629 case WLAN_CATEGORY_SPECTRUM_MGMT:
1630 ies_len = skb->len -
1631 offsetof(struct ieee80211_mgmt,
1632 u.action.u.chan_switch.variable);
1633
1634 if (ies_len < 0)
1635 break;
1636
1637 ieee802_11_parse_elems(
1638 mgmt->u.action.u.chan_switch.variable,
1639 ies_len, true, &elems);
1640
1641 if (elems.parse_error)
1642 break;
1643
1644 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1645 rx_status, &elems);
1646 break;
1647 }
1648 }
1649
1650 mgmt_out:
1651 sdata_unlock(sdata);
1652 }
1653
ieee80211_ibss_work(struct ieee80211_sub_if_data * sdata)1654 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1655 {
1656 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1657 struct sta_info *sta;
1658
1659 sdata_lock(sdata);
1660
1661 /*
1662 * Work could be scheduled after scan or similar
1663 * when we aren't even joined (or trying) with a
1664 * network.
1665 */
1666 if (!ifibss->ssid_len)
1667 goto out;
1668
1669 spin_lock_bh(&ifibss->incomplete_lock);
1670 while (!list_empty(&ifibss->incomplete_stations)) {
1671 sta = list_first_entry(&ifibss->incomplete_stations,
1672 struct sta_info, list);
1673 list_del(&sta->list);
1674 spin_unlock_bh(&ifibss->incomplete_lock);
1675
1676 ieee80211_ibss_finish_sta(sta);
1677 rcu_read_unlock();
1678 spin_lock_bh(&ifibss->incomplete_lock);
1679 }
1680 spin_unlock_bh(&ifibss->incomplete_lock);
1681
1682 switch (ifibss->state) {
1683 case IEEE80211_IBSS_MLME_SEARCH:
1684 ieee80211_sta_find_ibss(sdata);
1685 break;
1686 case IEEE80211_IBSS_MLME_JOINED:
1687 ieee80211_sta_merge_ibss(sdata);
1688 break;
1689 default:
1690 WARN_ON(1);
1691 break;
1692 }
1693
1694 out:
1695 sdata_unlock(sdata);
1696 }
1697
ieee80211_ibss_timer(unsigned long data)1698 static void ieee80211_ibss_timer(unsigned long data)
1699 {
1700 struct ieee80211_sub_if_data *sdata =
1701 (struct ieee80211_sub_if_data *) data;
1702
1703 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1704 }
1705
ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data * sdata)1706 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1707 {
1708 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1709
1710 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1711 (unsigned long) sdata);
1712 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1713 spin_lock_init(&ifibss->incomplete_lock);
1714 INIT_WORK(&ifibss->csa_connection_drop_work,
1715 ieee80211_csa_connection_drop_work);
1716 }
1717
1718 /* scan finished notification */
ieee80211_ibss_notify_scan_completed(struct ieee80211_local * local)1719 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1720 {
1721 struct ieee80211_sub_if_data *sdata;
1722
1723 mutex_lock(&local->iflist_mtx);
1724 list_for_each_entry(sdata, &local->interfaces, list) {
1725 if (!ieee80211_sdata_running(sdata))
1726 continue;
1727 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1728 continue;
1729 sdata->u.ibss.last_scan_completed = jiffies;
1730 }
1731 mutex_unlock(&local->iflist_mtx);
1732 }
1733
ieee80211_ibss_join(struct ieee80211_sub_if_data * sdata,struct cfg80211_ibss_params * params)1734 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1735 struct cfg80211_ibss_params *params)
1736 {
1737 u32 changed = 0;
1738 u32 rate_flags;
1739 struct ieee80211_supported_band *sband;
1740 enum ieee80211_chanctx_mode chanmode;
1741 struct ieee80211_local *local = sdata->local;
1742 int radar_detect_width = 0;
1743 int i;
1744 int ret;
1745
1746 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1747 ¶ms->chandef,
1748 sdata->wdev.iftype);
1749 if (ret < 0)
1750 return ret;
1751
1752 if (ret > 0) {
1753 if (!params->userspace_handles_dfs)
1754 return -EINVAL;
1755 radar_detect_width = BIT(params->chandef.width);
1756 }
1757
1758 chanmode = (params->channel_fixed && !ret) ?
1759 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1760
1761 mutex_lock(&local->chanctx_mtx);
1762 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode,
1763 radar_detect_width);
1764 mutex_unlock(&local->chanctx_mtx);
1765 if (ret < 0)
1766 return ret;
1767
1768 if (params->bssid) {
1769 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1770 sdata->u.ibss.fixed_bssid = true;
1771 } else
1772 sdata->u.ibss.fixed_bssid = false;
1773
1774 sdata->u.ibss.privacy = params->privacy;
1775 sdata->u.ibss.control_port = params->control_port;
1776 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1777 sdata->u.ibss.basic_rates = params->basic_rates;
1778 sdata->u.ibss.last_scan_completed = jiffies;
1779
1780 /* fix basic_rates if channel does not support these rates */
1781 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef);
1782 sband = local->hw.wiphy->bands[params->chandef.chan->band];
1783 for (i = 0; i < sband->n_bitrates; i++) {
1784 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1785 sdata->u.ibss.basic_rates &= ~BIT(i);
1786 }
1787 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1788 sizeof(params->mcast_rate));
1789
1790 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1791
1792 sdata->u.ibss.chandef = params->chandef;
1793 sdata->u.ibss.fixed_channel = params->channel_fixed;
1794
1795 if (params->ie) {
1796 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1797 GFP_KERNEL);
1798 if (sdata->u.ibss.ie)
1799 sdata->u.ibss.ie_len = params->ie_len;
1800 }
1801
1802 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1803 sdata->u.ibss.ibss_join_req = jiffies;
1804
1805 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1806 sdata->u.ibss.ssid_len = params->ssid_len;
1807
1808 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa,
1809 sizeof(sdata->u.ibss.ht_capa));
1810 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask,
1811 sizeof(sdata->u.ibss.ht_capa_mask));
1812
1813 /*
1814 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1815 * reserved, but an HT STA shall protect HT transmissions as though
1816 * the HT Protection field were set to non-HT mixed mode.
1817 *
1818 * In an IBSS, the RIFS Mode field of the HT Operation element is
1819 * also reserved, but an HT STA shall operate as though this field
1820 * were set to 1.
1821 */
1822
1823 sdata->vif.bss_conf.ht_operation_mode |=
1824 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1825 | IEEE80211_HT_PARAM_RIFS_MODE;
1826
1827 changed |= BSS_CHANGED_HT;
1828 ieee80211_bss_info_change_notify(sdata, changed);
1829
1830 sdata->smps_mode = IEEE80211_SMPS_OFF;
1831 sdata->needed_rx_chains = local->rx_chains;
1832
1833 ieee80211_queue_work(&local->hw, &sdata->work);
1834
1835 return 0;
1836 }
1837
ieee80211_ibss_leave(struct ieee80211_sub_if_data * sdata)1838 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1839 {
1840 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1841
1842 ieee80211_ibss_disconnect(sdata);
1843 ifibss->ssid_len = 0;
1844 eth_zero_addr(ifibss->bssid);
1845
1846 /* remove beacon */
1847 kfree(sdata->u.ibss.ie);
1848
1849 /* on the next join, re-program HT parameters */
1850 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1851 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1852
1853 synchronize_rcu();
1854
1855 skb_queue_purge(&sdata->skb_queue);
1856
1857 del_timer_sync(&sdata->u.ibss.timer);
1858
1859 return 0;
1860 }
1861