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 * Copyright(c) 2016 Intel Deutschland GmbH
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
15 */
16
17 #include <linux/delay.h>
18 #include <linux/slab.h>
19 #include <linux/if_ether.h>
20 #include <linux/skbuff.h>
21 #include <linux/if_arp.h>
22 #include <linux/etherdevice.h>
23 #include <linux/rtnetlink.h>
24 #include <net/mac80211.h>
25
26 #include "ieee80211_i.h"
27 #include "driver-ops.h"
28 #include "rate.h"
29
30 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
31 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
32
33 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
34 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
35 #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ)
36
37 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
38
39 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)40 ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata,
41 const int beacon_int, const u32 basic_rates,
42 const u16 capability, u64 tsf,
43 struct cfg80211_chan_def *chandef,
44 bool *have_higher_than_11mbit,
45 struct cfg80211_csa_settings *csa_settings)
46 {
47 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
48 struct ieee80211_local *local = sdata->local;
49 int rates_n = 0, i, ri;
50 struct ieee80211_mgmt *mgmt;
51 u8 *pos;
52 struct ieee80211_supported_band *sband;
53 u32 rate_flags, rates = 0, rates_added = 0;
54 struct beacon_data *presp;
55 int frame_len;
56 int shift;
57
58 /* Build IBSS probe response */
59 frame_len = sizeof(struct ieee80211_hdr_3addr) +
60 12 /* struct ieee80211_mgmt.u.beacon */ +
61 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
62 2 + 8 /* max Supported Rates */ +
63 3 /* max DS params */ +
64 4 /* IBSS params */ +
65 5 /* Channel Switch Announcement */ +
66 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
67 2 + sizeof(struct ieee80211_ht_cap) +
68 2 + sizeof(struct ieee80211_ht_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 == IEEE80211_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 == IEEE80211_BAND_5GHZ;
352 bss_change |= BSS_CHANGED_ERP_SLOT;
353
354 /* cf. IEEE 802.11 9.2.12 */
355 if (chan->band == IEEE80211_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_WIDTH_20_NOHT);
429 chandef.width = sdata->u.ibss.chandef.width;
430 break;
431 case NL80211_CHAN_WIDTH_80:
432 case NL80211_CHAN_WIDTH_160:
433 chandef = sdata->u.ibss.chandef;
434 chandef.chan = cbss->channel;
435 break;
436 default:
437 /* fall back to 20 MHz for unsupported modes */
438 cfg80211_chandef_create(&chandef, cbss->channel,
439 NL80211_CHAN_WIDTH_20_NOHT);
440 break;
441 }
442
443 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
444 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
445 shift = ieee80211_vif_get_shift(&sdata->vif);
446
447 basic_rates = 0;
448
449 for (i = 0; i < bss->supp_rates_len; i++) {
450 int rate = bss->supp_rates[i] & 0x7f;
451 bool is_basic = !!(bss->supp_rates[i] & 0x80);
452
453 for (j = 0; j < sband->n_bitrates; j++) {
454 int brate;
455 if ((rate_flags & sband->bitrates[j].flags)
456 != rate_flags)
457 continue;
458
459 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
460 5 * (1 << shift));
461 if (brate == rate) {
462 if (is_basic)
463 basic_rates |= BIT(j);
464 break;
465 }
466 }
467 }
468
469 rcu_read_lock();
470 ies = rcu_dereference(cbss->ies);
471 tsf = ies->tsf;
472 rcu_read_unlock();
473
474 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
475 beacon_int,
476 &chandef,
477 basic_rates,
478 cbss->capability,
479 tsf, false);
480 }
481
ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data * sdata,struct cfg80211_csa_settings * csa_settings)482 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
483 struct cfg80211_csa_settings *csa_settings)
484 {
485 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
486 struct beacon_data *presp, *old_presp;
487 struct cfg80211_bss *cbss;
488 const struct cfg80211_bss_ies *ies;
489 u16 capability = 0;
490 u64 tsf;
491 int ret = 0;
492
493 sdata_assert_lock(sdata);
494
495 if (ifibss->privacy)
496 capability = WLAN_CAPABILITY_PRIVACY;
497
498 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
499 ifibss->bssid, ifibss->ssid,
500 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS,
501 IEEE80211_PRIVACY(ifibss->privacy));
502
503 if (WARN_ON(!cbss)) {
504 ret = -EINVAL;
505 goto out;
506 }
507
508 rcu_read_lock();
509 ies = rcu_dereference(cbss->ies);
510 tsf = ies->tsf;
511 rcu_read_unlock();
512 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
513
514 old_presp = rcu_dereference_protected(ifibss->presp,
515 lockdep_is_held(&sdata->wdev.mtx));
516
517 presp = ieee80211_ibss_build_presp(sdata,
518 sdata->vif.bss_conf.beacon_int,
519 sdata->vif.bss_conf.basic_rates,
520 capability, tsf, &ifibss->chandef,
521 NULL, csa_settings);
522 if (!presp) {
523 ret = -ENOMEM;
524 goto out;
525 }
526
527 rcu_assign_pointer(ifibss->presp, presp);
528 if (old_presp)
529 kfree_rcu(old_presp, rcu_head);
530
531 return BSS_CHANGED_BEACON;
532 out:
533 return ret;
534 }
535
ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data * sdata)536 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
537 {
538 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
539 struct cfg80211_bss *cbss;
540 int err, changed = 0;
541
542 sdata_assert_lock(sdata);
543
544 /* update cfg80211 bss information with the new channel */
545 if (!is_zero_ether_addr(ifibss->bssid)) {
546 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
547 ifibss->chandef.chan,
548 ifibss->bssid, ifibss->ssid,
549 ifibss->ssid_len,
550 IEEE80211_BSS_TYPE_IBSS,
551 IEEE80211_PRIVACY(ifibss->privacy));
552 /* XXX: should not really modify cfg80211 data */
553 if (cbss) {
554 cbss->channel = sdata->csa_chandef.chan;
555 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
556 }
557 }
558
559 ifibss->chandef = sdata->csa_chandef;
560
561 /* generate the beacon */
562 err = ieee80211_ibss_csa_beacon(sdata, NULL);
563 if (err < 0)
564 return err;
565
566 changed |= err;
567
568 return changed;
569 }
570
ieee80211_ibss_stop(struct ieee80211_sub_if_data * sdata)571 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
572 {
573 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
574
575 cancel_work_sync(&ifibss->csa_connection_drop_work);
576 }
577
ieee80211_ibss_finish_sta(struct sta_info * sta)578 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
579 __acquires(RCU)
580 {
581 struct ieee80211_sub_if_data *sdata = sta->sdata;
582 u8 addr[ETH_ALEN];
583
584 memcpy(addr, sta->sta.addr, ETH_ALEN);
585
586 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
587
588 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
589 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
590 /* authorize the station only if the network is not RSN protected. If
591 * not wait for the userspace to authorize it */
592 if (!sta->sdata->u.ibss.control_port)
593 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
594
595 rate_control_rate_init(sta);
596
597 /* If it fails, maybe we raced another insertion? */
598 if (sta_info_insert_rcu(sta))
599 return sta_info_get(sdata, addr);
600 return sta;
601 }
602
603 static struct sta_info *
ieee80211_ibss_add_sta(struct ieee80211_sub_if_data * sdata,const u8 * bssid,const u8 * addr,u32 supp_rates)604 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
605 const u8 *addr, u32 supp_rates)
606 __acquires(RCU)
607 {
608 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
609 struct ieee80211_local *local = sdata->local;
610 struct sta_info *sta;
611 struct ieee80211_chanctx_conf *chanctx_conf;
612 struct ieee80211_supported_band *sband;
613 enum nl80211_bss_scan_width scan_width;
614 int band;
615
616 /*
617 * XXX: Consider removing the least recently used entry and
618 * allow new one to be added.
619 */
620 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
621 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
622 sdata->name, addr);
623 rcu_read_lock();
624 return NULL;
625 }
626
627 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
628 rcu_read_lock();
629 return NULL;
630 }
631
632 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
633 rcu_read_lock();
634 return NULL;
635 }
636
637 rcu_read_lock();
638 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
639 if (WARN_ON_ONCE(!chanctx_conf))
640 return NULL;
641 band = chanctx_conf->def.chan->band;
642 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
643 rcu_read_unlock();
644
645 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
646 if (!sta) {
647 rcu_read_lock();
648 return NULL;
649 }
650
651 sta->rx_stats.last_rx = jiffies;
652
653 /* make sure mandatory rates are always added */
654 sband = local->hw.wiphy->bands[band];
655 sta->sta.supp_rates[band] = supp_rates |
656 ieee80211_mandatory_rates(sband, scan_width);
657
658 return ieee80211_ibss_finish_sta(sta);
659 }
660
ieee80211_sta_active_ibss(struct ieee80211_sub_if_data * sdata)661 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
662 {
663 struct ieee80211_local *local = sdata->local;
664 int active = 0;
665 struct sta_info *sta;
666
667 sdata_assert_lock(sdata);
668
669 rcu_read_lock();
670
671 list_for_each_entry_rcu(sta, &local->sta_list, list) {
672 if (sta->sdata == sdata &&
673 time_after(sta->rx_stats.last_rx +
674 IEEE80211_IBSS_MERGE_INTERVAL,
675 jiffies)) {
676 active++;
677 break;
678 }
679 }
680
681 rcu_read_unlock();
682
683 return active;
684 }
685
ieee80211_ibss_disconnect(struct ieee80211_sub_if_data * sdata)686 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
687 {
688 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
689 struct ieee80211_local *local = sdata->local;
690 struct cfg80211_bss *cbss;
691 struct beacon_data *presp;
692 struct sta_info *sta;
693
694 if (!is_zero_ether_addr(ifibss->bssid)) {
695 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
696 ifibss->bssid, ifibss->ssid,
697 ifibss->ssid_len,
698 IEEE80211_BSS_TYPE_IBSS,
699 IEEE80211_PRIVACY(ifibss->privacy));
700
701 if (cbss) {
702 cfg80211_unlink_bss(local->hw.wiphy, cbss);
703 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
704 }
705 }
706
707 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
708
709 sta_info_flush(sdata);
710
711 spin_lock_bh(&ifibss->incomplete_lock);
712 while (!list_empty(&ifibss->incomplete_stations)) {
713 sta = list_first_entry(&ifibss->incomplete_stations,
714 struct sta_info, list);
715 list_del(&sta->list);
716 spin_unlock_bh(&ifibss->incomplete_lock);
717
718 sta_info_free(local, sta);
719 spin_lock_bh(&ifibss->incomplete_lock);
720 }
721 spin_unlock_bh(&ifibss->incomplete_lock);
722
723 netif_carrier_off(sdata->dev);
724
725 sdata->vif.bss_conf.ibss_joined = false;
726 sdata->vif.bss_conf.ibss_creator = false;
727 sdata->vif.bss_conf.enable_beacon = false;
728 sdata->vif.bss_conf.ssid_len = 0;
729
730 /* remove beacon */
731 presp = rcu_dereference_protected(ifibss->presp,
732 lockdep_is_held(&sdata->wdev.mtx));
733 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
734 if (presp)
735 kfree_rcu(presp, rcu_head);
736
737 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
738 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
739 BSS_CHANGED_IBSS);
740 drv_leave_ibss(local, sdata);
741 mutex_lock(&local->mtx);
742 ieee80211_vif_release_channel(sdata);
743 mutex_unlock(&local->mtx);
744 }
745
ieee80211_csa_connection_drop_work(struct work_struct * work)746 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
747 {
748 struct ieee80211_sub_if_data *sdata =
749 container_of(work, struct ieee80211_sub_if_data,
750 u.ibss.csa_connection_drop_work);
751
752 sdata_lock(sdata);
753
754 ieee80211_ibss_disconnect(sdata);
755 synchronize_rcu();
756 skb_queue_purge(&sdata->skb_queue);
757
758 /* trigger a scan to find another IBSS network to join */
759 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
760
761 sdata_unlock(sdata);
762 }
763
ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data * sdata)764 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
765 {
766 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
767 int err;
768
769 /* if the current channel is a DFS channel, mark the channel as
770 * unavailable.
771 */
772 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
773 &ifibss->chandef,
774 NL80211_IFTYPE_ADHOC);
775 if (err > 0)
776 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
777 GFP_ATOMIC);
778 }
779
780 static bool
ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data * sdata,struct ieee802_11_elems * elems,bool beacon)781 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
782 struct ieee802_11_elems *elems,
783 bool beacon)
784 {
785 struct cfg80211_csa_settings params;
786 struct ieee80211_csa_ie csa_ie;
787 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
788 enum nl80211_channel_type ch_type;
789 int err;
790 u32 sta_flags;
791
792 sdata_assert_lock(sdata);
793
794 sta_flags = IEEE80211_STA_DISABLE_VHT;
795 switch (ifibss->chandef.width) {
796 case NL80211_CHAN_WIDTH_5:
797 case NL80211_CHAN_WIDTH_10:
798 case NL80211_CHAN_WIDTH_20_NOHT:
799 sta_flags |= IEEE80211_STA_DISABLE_HT;
800 /* fall through */
801 case NL80211_CHAN_WIDTH_20:
802 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
803 break;
804 default:
805 break;
806 }
807
808 memset(¶ms, 0, sizeof(params));
809 memset(&csa_ie, 0, sizeof(csa_ie));
810 err = ieee80211_parse_ch_switch_ie(sdata, elems,
811 ifibss->chandef.chan->band,
812 sta_flags, ifibss->bssid, &csa_ie);
813 /* can't switch to destination channel, fail */
814 if (err < 0)
815 goto disconnect;
816
817 /* did not contain a CSA */
818 if (err)
819 return false;
820
821 /* channel switch is not supported, disconnect */
822 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
823 goto disconnect;
824
825 params.count = csa_ie.count;
826 params.chandef = csa_ie.chandef;
827
828 switch (ifibss->chandef.width) {
829 case NL80211_CHAN_WIDTH_20_NOHT:
830 case NL80211_CHAN_WIDTH_20:
831 case NL80211_CHAN_WIDTH_40:
832 /* keep our current HT mode (HT20/HT40+/HT40-), even if
833 * another mode has been announced. The mode is not adopted
834 * within the beacon while doing CSA and we should therefore
835 * keep the mode which we announce.
836 */
837 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
838 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan,
839 ch_type);
840 break;
841 case NL80211_CHAN_WIDTH_5:
842 case NL80211_CHAN_WIDTH_10:
843 if (params.chandef.width != ifibss->chandef.width) {
844 sdata_info(sdata,
845 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
846 ifibss->bssid,
847 params.chandef.chan->center_freq,
848 params.chandef.width,
849 params.chandef.center_freq1,
850 params.chandef.center_freq2);
851 goto disconnect;
852 }
853 break;
854 default:
855 /* should not happen, sta_flags should prevent VHT modes. */
856 WARN_ON(1);
857 goto disconnect;
858 }
859
860 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef,
861 NL80211_IFTYPE_ADHOC)) {
862 sdata_info(sdata,
863 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
864 ifibss->bssid,
865 params.chandef.chan->center_freq,
866 params.chandef.width,
867 params.chandef.center_freq1,
868 params.chandef.center_freq2);
869 goto disconnect;
870 }
871
872 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
873 ¶ms.chandef,
874 NL80211_IFTYPE_ADHOC);
875 if (err < 0)
876 goto disconnect;
877 if (err > 0 && !ifibss->userspace_handles_dfs) {
878 /* IBSS-DFS only allowed with a control program */
879 goto disconnect;
880 }
881
882 params.radar_required = err;
883
884 if (cfg80211_chandef_identical(¶ms.chandef,
885 &sdata->vif.bss_conf.chandef)) {
886 ibss_dbg(sdata,
887 "received csa with an identical chandef, ignoring\n");
888 return true;
889 }
890
891 /* all checks done, now perform the channel switch. */
892 ibss_dbg(sdata,
893 "received channel switch announcement to go to channel %d MHz\n",
894 params.chandef.chan->center_freq);
895
896 params.block_tx = !!csa_ie.mode;
897
898 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
899 ¶ms))
900 goto disconnect;
901
902 ieee80211_ibss_csa_mark_radar(sdata);
903
904 return true;
905 disconnect:
906 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
907 ieee80211_queue_work(&sdata->local->hw,
908 &ifibss->csa_connection_drop_work);
909
910 ieee80211_ibss_csa_mark_radar(sdata);
911
912 return true;
913 }
914
915 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)916 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
917 struct ieee80211_mgmt *mgmt, size_t len,
918 struct ieee80211_rx_status *rx_status,
919 struct ieee802_11_elems *elems)
920 {
921 int required_len;
922
923 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
924 return;
925
926 /* CSA is the only action we handle for now */
927 if (mgmt->u.action.u.measurement.action_code !=
928 WLAN_ACTION_SPCT_CHL_SWITCH)
929 return;
930
931 required_len = IEEE80211_MIN_ACTION_SIZE +
932 sizeof(mgmt->u.action.u.chan_switch);
933 if (len < required_len)
934 return;
935
936 if (!sdata->vif.csa_active)
937 ieee80211_ibss_process_chanswitch(sdata, elems, false);
938 }
939
ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)940 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
941 struct ieee80211_mgmt *mgmt,
942 size_t len)
943 {
944 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
945
946 if (len < IEEE80211_DEAUTH_FRAME_LEN)
947 return;
948
949 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
950 mgmt->sa, mgmt->da, mgmt->bssid, reason);
951 sta_info_destroy_addr(sdata, mgmt->sa);
952 }
953
ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)954 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
955 struct ieee80211_mgmt *mgmt,
956 size_t len)
957 {
958 u16 auth_alg, auth_transaction;
959
960 sdata_assert_lock(sdata);
961
962 if (len < 24 + 6)
963 return;
964
965 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
966 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
967
968 ibss_dbg(sdata,
969 "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
970 mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
971
972 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
973 return;
974
975 /*
976 * IEEE 802.11 standard does not require authentication in IBSS
977 * networks and most implementations do not seem to use it.
978 * However, try to reply to authentication attempts if someone
979 * has actually implemented this.
980 */
981 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
982 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
983 }
984
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)985 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
986 struct ieee80211_mgmt *mgmt, size_t len,
987 struct ieee80211_rx_status *rx_status,
988 struct ieee802_11_elems *elems,
989 struct ieee80211_channel *channel)
990 {
991 struct sta_info *sta;
992 enum ieee80211_band band = rx_status->band;
993 enum nl80211_bss_scan_width scan_width;
994 struct ieee80211_local *local = sdata->local;
995 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
996 bool rates_updated = false;
997 u32 supp_rates = 0;
998
999 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1000 return;
1001
1002 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
1003 return;
1004
1005 rcu_read_lock();
1006 sta = sta_info_get(sdata, mgmt->sa);
1007
1008 if (elems->supp_rates) {
1009 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1010 band, NULL);
1011 if (sta) {
1012 u32 prev_rates;
1013
1014 prev_rates = sta->sta.supp_rates[band];
1015 /* make sure mandatory rates are always added */
1016 scan_width = NL80211_BSS_CHAN_WIDTH_20;
1017 if (rx_status->flag & RX_FLAG_5MHZ)
1018 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1019 if (rx_status->flag & RX_FLAG_10MHZ)
1020 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1021
1022 sta->sta.supp_rates[band] = supp_rates |
1023 ieee80211_mandatory_rates(sband, scan_width);
1024 if (sta->sta.supp_rates[band] != prev_rates) {
1025 ibss_dbg(sdata,
1026 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1027 sta->sta.addr, prev_rates,
1028 sta->sta.supp_rates[band]);
1029 rates_updated = true;
1030 }
1031 } else {
1032 rcu_read_unlock();
1033 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1034 mgmt->sa, supp_rates);
1035 }
1036 }
1037
1038 if (sta && !sta->sta.wme &&
1039 elems->wmm_info && local->hw.queues >= IEEE80211_NUM_ACS) {
1040 sta->sta.wme = true;
1041 ieee80211_check_fast_xmit(sta);
1042 }
1043
1044 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1045 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1046 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1047 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1048 /* we both use HT */
1049 struct ieee80211_ht_cap htcap_ie;
1050 struct cfg80211_chan_def chandef;
1051 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
1052
1053 ieee80211_ht_oper_to_chandef(channel,
1054 elems->ht_operation,
1055 &chandef);
1056
1057 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1058 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1059 &htcap_ie,
1060 sta);
1061
1062 if (elems->vht_operation && elems->vht_cap_elem &&
1063 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1064 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1065 /* we both use VHT */
1066 struct ieee80211_vht_cap cap_ie;
1067 struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap;
1068
1069 ieee80211_vht_oper_to_chandef(channel,
1070 elems->vht_operation,
1071 &chandef);
1072 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1073 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1074 &cap_ie, sta);
1075 if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap)))
1076 rates_updated |= true;
1077 }
1078
1079 if (bw != sta->sta.bandwidth)
1080 rates_updated |= true;
1081
1082 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1083 &chandef))
1084 WARN_ON_ONCE(1);
1085 }
1086
1087 if (sta && rates_updated) {
1088 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1089 u8 rx_nss = sta->sta.rx_nss;
1090
1091 /* Force rx_nss recalculation */
1092 sta->sta.rx_nss = 0;
1093 rate_control_rate_init(sta);
1094 if (sta->sta.rx_nss != rx_nss)
1095 changed |= IEEE80211_RC_NSS_CHANGED;
1096
1097 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1098 }
1099
1100 rcu_read_unlock();
1101 }
1102
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)1103 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1104 struct ieee80211_mgmt *mgmt, size_t len,
1105 struct ieee80211_rx_status *rx_status,
1106 struct ieee802_11_elems *elems)
1107 {
1108 struct ieee80211_local *local = sdata->local;
1109 struct cfg80211_bss *cbss;
1110 struct ieee80211_bss *bss;
1111 struct ieee80211_channel *channel;
1112 u64 beacon_timestamp, rx_timestamp;
1113 u32 supp_rates = 0;
1114 enum ieee80211_band band = rx_status->band;
1115
1116 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1117 if (!channel)
1118 return;
1119
1120 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1121
1122 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1123 channel);
1124 if (!bss)
1125 return;
1126
1127 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1128
1129 /* same for beacon and probe response */
1130 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1131
1132 /* check if we need to merge IBSS */
1133
1134 /* not an IBSS */
1135 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1136 goto put_bss;
1137
1138 /* different channel */
1139 if (sdata->u.ibss.fixed_channel &&
1140 sdata->u.ibss.chandef.chan != cbss->channel)
1141 goto put_bss;
1142
1143 /* different SSID */
1144 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1145 memcmp(elems->ssid, sdata->u.ibss.ssid,
1146 sdata->u.ibss.ssid_len))
1147 goto put_bss;
1148
1149 /* process channel switch */
1150 if (sdata->vif.csa_active ||
1151 ieee80211_ibss_process_chanswitch(sdata, elems, true))
1152 goto put_bss;
1153
1154 /* same BSSID */
1155 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1156 goto put_bss;
1157
1158 /* we use a fixed BSSID */
1159 if (sdata->u.ibss.fixed_bssid)
1160 goto put_bss;
1161
1162 if (ieee80211_have_rx_timestamp(rx_status)) {
1163 /* time when timestamp field was received */
1164 rx_timestamp =
1165 ieee80211_calculate_rx_timestamp(local, rx_status,
1166 len + FCS_LEN, 24);
1167 } else {
1168 /*
1169 * second best option: get current TSF
1170 * (will return -1 if not supported)
1171 */
1172 rx_timestamp = drv_get_tsf(local, sdata);
1173 }
1174
1175 ibss_dbg(sdata,
1176 "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1177 mgmt->sa, mgmt->bssid,
1178 (unsigned long long)rx_timestamp,
1179 (unsigned long long)beacon_timestamp,
1180 (unsigned long long)(rx_timestamp - beacon_timestamp),
1181 jiffies);
1182
1183 if (beacon_timestamp > rx_timestamp) {
1184 ibss_dbg(sdata,
1185 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1186 mgmt->bssid);
1187 ieee80211_sta_join_ibss(sdata, bss);
1188 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1189 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1190 supp_rates);
1191 rcu_read_unlock();
1192 }
1193
1194 put_bss:
1195 ieee80211_rx_bss_put(local, bss);
1196 }
1197
ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data * sdata,const u8 * bssid,const u8 * addr,u32 supp_rates)1198 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1199 const u8 *bssid, const u8 *addr,
1200 u32 supp_rates)
1201 {
1202 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1203 struct ieee80211_local *local = sdata->local;
1204 struct sta_info *sta;
1205 struct ieee80211_chanctx_conf *chanctx_conf;
1206 struct ieee80211_supported_band *sband;
1207 enum nl80211_bss_scan_width scan_width;
1208 int band;
1209
1210 /*
1211 * XXX: Consider removing the least recently used entry and
1212 * allow new one to be added.
1213 */
1214 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1215 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1216 sdata->name, addr);
1217 return;
1218 }
1219
1220 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1221 return;
1222
1223 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1224 return;
1225
1226 rcu_read_lock();
1227 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1228 if (WARN_ON_ONCE(!chanctx_conf)) {
1229 rcu_read_unlock();
1230 return;
1231 }
1232 band = chanctx_conf->def.chan->band;
1233 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1234 rcu_read_unlock();
1235
1236 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1237 if (!sta)
1238 return;
1239
1240 sta->rx_stats.last_rx = jiffies;
1241
1242 /* make sure mandatory rates are always added */
1243 sband = local->hw.wiphy->bands[band];
1244 sta->sta.supp_rates[band] = supp_rates |
1245 ieee80211_mandatory_rates(sband, scan_width);
1246
1247 spin_lock(&ifibss->incomplete_lock);
1248 list_add(&sta->list, &ifibss->incomplete_stations);
1249 spin_unlock(&ifibss->incomplete_lock);
1250 ieee80211_queue_work(&local->hw, &sdata->work);
1251 }
1252
ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data * sdata)1253 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1254 {
1255 struct ieee80211_local *local = sdata->local;
1256 struct sta_info *sta, *tmp;
1257 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1258 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1259
1260 mutex_lock(&local->sta_mtx);
1261
1262 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1263 if (sdata != sta->sdata)
1264 continue;
1265
1266 if (time_after(jiffies, sta->rx_stats.last_rx + exp_time) ||
1267 (time_after(jiffies, sta->rx_stats.last_rx + exp_rsn) &&
1268 sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1269 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1270 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1271 "not authorized " : "", sta->sta.addr);
1272
1273 WARN_ON(__sta_info_destroy(sta));
1274 }
1275 }
1276
1277 mutex_unlock(&local->sta_mtx);
1278 }
1279
1280 /*
1281 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1282 */
1283
ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data * sdata)1284 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1285 {
1286 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1287 enum nl80211_bss_scan_width scan_width;
1288
1289 sdata_assert_lock(sdata);
1290
1291 mod_timer(&ifibss->timer,
1292 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1293
1294 ieee80211_ibss_sta_expire(sdata);
1295
1296 if (time_before(jiffies, ifibss->last_scan_completed +
1297 IEEE80211_IBSS_MERGE_INTERVAL))
1298 return;
1299
1300 if (ieee80211_sta_active_ibss(sdata))
1301 return;
1302
1303 if (ifibss->fixed_channel)
1304 return;
1305
1306 sdata_info(sdata,
1307 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1308
1309 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1310 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1311 NULL, 0, scan_width);
1312 }
1313
ieee80211_sta_create_ibss(struct ieee80211_sub_if_data * sdata)1314 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1315 {
1316 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1317 u8 bssid[ETH_ALEN];
1318 u16 capability;
1319 int i;
1320
1321 sdata_assert_lock(sdata);
1322
1323 if (ifibss->fixed_bssid) {
1324 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1325 } else {
1326 /* Generate random, not broadcast, locally administered BSSID. Mix in
1327 * own MAC address to make sure that devices that do not have proper
1328 * random number generator get different BSSID. */
1329 get_random_bytes(bssid, ETH_ALEN);
1330 for (i = 0; i < ETH_ALEN; i++)
1331 bssid[i] ^= sdata->vif.addr[i];
1332 bssid[0] &= ~0x01;
1333 bssid[0] |= 0x02;
1334 }
1335
1336 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1337
1338 capability = WLAN_CAPABILITY_IBSS;
1339
1340 if (ifibss->privacy)
1341 capability |= WLAN_CAPABILITY_PRIVACY;
1342
1343 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1344 &ifibss->chandef, ifibss->basic_rates,
1345 capability, 0, true);
1346 }
1347
ibss_setup_channels(struct wiphy * wiphy,struct ieee80211_channel ** channels,unsigned int channels_max,u32 center_freq,u32 width)1348 static unsigned ibss_setup_channels(struct wiphy *wiphy,
1349 struct ieee80211_channel **channels,
1350 unsigned int channels_max,
1351 u32 center_freq, u32 width)
1352 {
1353 struct ieee80211_channel *chan = NULL;
1354 unsigned int n_chan = 0;
1355 u32 start_freq, end_freq, freq;
1356
1357 if (width <= 20) {
1358 start_freq = center_freq;
1359 end_freq = center_freq;
1360 } else {
1361 start_freq = center_freq - width / 2 + 10;
1362 end_freq = center_freq + width / 2 - 10;
1363 }
1364
1365 for (freq = start_freq; freq <= end_freq; freq += 20) {
1366 chan = ieee80211_get_channel(wiphy, freq);
1367 if (!chan)
1368 continue;
1369 if (n_chan >= channels_max)
1370 return n_chan;
1371
1372 channels[n_chan] = chan;
1373 n_chan++;
1374 }
1375
1376 return n_chan;
1377 }
1378
1379 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)1380 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1381 const struct cfg80211_chan_def *chandef,
1382 struct ieee80211_channel **channels,
1383 unsigned int channels_max)
1384 {
1385 unsigned int n_chan = 0;
1386 u32 width, cf1, cf2 = 0;
1387
1388 switch (chandef->width) {
1389 case NL80211_CHAN_WIDTH_40:
1390 width = 40;
1391 break;
1392 case NL80211_CHAN_WIDTH_80P80:
1393 cf2 = chandef->center_freq2;
1394 /* fall through */
1395 case NL80211_CHAN_WIDTH_80:
1396 width = 80;
1397 break;
1398 case NL80211_CHAN_WIDTH_160:
1399 width = 160;
1400 break;
1401 default:
1402 width = 20;
1403 break;
1404 }
1405
1406 cf1 = chandef->center_freq1;
1407
1408 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1409
1410 if (cf2)
1411 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1412 channels_max - n_chan, cf2,
1413 width);
1414
1415 return n_chan;
1416 }
1417
1418 /*
1419 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1420 */
1421
ieee80211_sta_find_ibss(struct ieee80211_sub_if_data * sdata)1422 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1423 {
1424 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1425 struct ieee80211_local *local = sdata->local;
1426 struct cfg80211_bss *cbss;
1427 struct ieee80211_channel *chan = NULL;
1428 const u8 *bssid = NULL;
1429 enum nl80211_bss_scan_width scan_width;
1430 int active_ibss;
1431
1432 sdata_assert_lock(sdata);
1433
1434 active_ibss = ieee80211_sta_active_ibss(sdata);
1435 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1436
1437 if (active_ibss)
1438 return;
1439
1440 if (ifibss->fixed_bssid)
1441 bssid = ifibss->bssid;
1442 if (ifibss->fixed_channel)
1443 chan = ifibss->chandef.chan;
1444 if (!is_zero_ether_addr(ifibss->bssid))
1445 bssid = ifibss->bssid;
1446 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1447 ifibss->ssid, ifibss->ssid_len,
1448 IEEE80211_BSS_TYPE_IBSS,
1449 IEEE80211_PRIVACY(ifibss->privacy));
1450
1451 if (cbss) {
1452 struct ieee80211_bss *bss;
1453
1454 bss = (void *)cbss->priv;
1455 ibss_dbg(sdata,
1456 "sta_find_ibss: selected %pM current %pM\n",
1457 cbss->bssid, ifibss->bssid);
1458 sdata_info(sdata,
1459 "Selected IBSS BSSID %pM based on configured SSID\n",
1460 cbss->bssid);
1461
1462 ieee80211_sta_join_ibss(sdata, bss);
1463 ieee80211_rx_bss_put(local, bss);
1464 return;
1465 }
1466
1467 /* if a fixed bssid and a fixed freq have been provided create the IBSS
1468 * directly and do not waste time scanning
1469 */
1470 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1471 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1472 bssid);
1473 ieee80211_sta_create_ibss(sdata);
1474 return;
1475 }
1476
1477
1478 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1479
1480 /* Selected IBSS not found in current scan results - try to scan */
1481 if (time_after(jiffies, ifibss->last_scan_completed +
1482 IEEE80211_SCAN_INTERVAL)) {
1483 struct ieee80211_channel *channels[8];
1484 unsigned int num;
1485
1486 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1487
1488 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1489
1490 if (ifibss->fixed_channel) {
1491 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1492 &ifibss->chandef,
1493 channels,
1494 ARRAY_SIZE(channels));
1495 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1496 ifibss->ssid_len, channels,
1497 num, scan_width);
1498 } else {
1499 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1500 ifibss->ssid_len, NULL,
1501 0, scan_width);
1502 }
1503 } else {
1504 int interval = IEEE80211_SCAN_INTERVAL;
1505
1506 if (time_after(jiffies, ifibss->ibss_join_req +
1507 IEEE80211_IBSS_JOIN_TIMEOUT))
1508 ieee80211_sta_create_ibss(sdata);
1509
1510 mod_timer(&ifibss->timer,
1511 round_jiffies(jiffies + interval));
1512 }
1513 }
1514
ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data * sdata,struct sk_buff * req)1515 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1516 struct sk_buff *req)
1517 {
1518 struct ieee80211_mgmt *mgmt = (void *)req->data;
1519 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1520 struct ieee80211_local *local = sdata->local;
1521 int tx_last_beacon, len = req->len;
1522 struct sk_buff *skb;
1523 struct beacon_data *presp;
1524 u8 *pos, *end;
1525
1526 sdata_assert_lock(sdata);
1527
1528 presp = rcu_dereference_protected(ifibss->presp,
1529 lockdep_is_held(&sdata->wdev.mtx));
1530
1531 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1532 len < 24 + 2 || !presp)
1533 return;
1534
1535 tx_last_beacon = drv_tx_last_beacon(local);
1536
1537 ibss_dbg(sdata,
1538 "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
1539 mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
1540
1541 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1542 return;
1543
1544 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1545 !is_broadcast_ether_addr(mgmt->bssid))
1546 return;
1547
1548 end = ((u8 *) mgmt) + len;
1549 pos = mgmt->u.probe_req.variable;
1550 if (pos[0] != WLAN_EID_SSID ||
1551 pos + 2 + pos[1] > end) {
1552 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1553 mgmt->sa);
1554 return;
1555 }
1556 if (pos[1] != 0 &&
1557 (pos[1] != ifibss->ssid_len ||
1558 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1559 /* Ignore ProbeReq for foreign SSID */
1560 return;
1561 }
1562
1563 /* Reply with ProbeResp */
1564 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1565 if (!skb)
1566 return;
1567
1568 skb_reserve(skb, local->tx_headroom);
1569 memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
1570
1571 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1572 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1573 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1574
1575 /* avoid excessive retries for probe request to wildcard SSIDs */
1576 if (pos[1] == 0)
1577 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1578
1579 ieee80211_tx_skb(sdata, skb);
1580 }
1581
1582 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)1583 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1584 struct ieee80211_mgmt *mgmt, size_t len,
1585 struct ieee80211_rx_status *rx_status)
1586 {
1587 size_t baselen;
1588 struct ieee802_11_elems elems;
1589
1590 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1591 offsetof(typeof(mgmt->u.beacon), variable));
1592
1593 /*
1594 * either beacon or probe_resp but the variable field is at the
1595 * same offset
1596 */
1597 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1598 if (baselen > len)
1599 return;
1600
1601 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1602 false, &elems);
1603
1604 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1605 }
1606
ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1607 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1608 struct sk_buff *skb)
1609 {
1610 struct ieee80211_rx_status *rx_status;
1611 struct ieee80211_mgmt *mgmt;
1612 u16 fc;
1613 struct ieee802_11_elems elems;
1614 int ies_len;
1615
1616 rx_status = IEEE80211_SKB_RXCB(skb);
1617 mgmt = (struct ieee80211_mgmt *) skb->data;
1618 fc = le16_to_cpu(mgmt->frame_control);
1619
1620 sdata_lock(sdata);
1621
1622 if (!sdata->u.ibss.ssid_len)
1623 goto mgmt_out; /* not ready to merge yet */
1624
1625 switch (fc & IEEE80211_FCTL_STYPE) {
1626 case IEEE80211_STYPE_PROBE_REQ:
1627 ieee80211_rx_mgmt_probe_req(sdata, skb);
1628 break;
1629 case IEEE80211_STYPE_PROBE_RESP:
1630 case IEEE80211_STYPE_BEACON:
1631 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1632 rx_status);
1633 break;
1634 case IEEE80211_STYPE_AUTH:
1635 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1636 break;
1637 case IEEE80211_STYPE_DEAUTH:
1638 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1639 break;
1640 case IEEE80211_STYPE_ACTION:
1641 switch (mgmt->u.action.category) {
1642 case WLAN_CATEGORY_SPECTRUM_MGMT:
1643 ies_len = skb->len -
1644 offsetof(struct ieee80211_mgmt,
1645 u.action.u.chan_switch.variable);
1646
1647 if (ies_len < 0)
1648 break;
1649
1650 ieee802_11_parse_elems(
1651 mgmt->u.action.u.chan_switch.variable,
1652 ies_len, true, &elems);
1653
1654 if (elems.parse_error)
1655 break;
1656
1657 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1658 rx_status, &elems);
1659 break;
1660 }
1661 }
1662
1663 mgmt_out:
1664 sdata_unlock(sdata);
1665 }
1666
ieee80211_ibss_work(struct ieee80211_sub_if_data * sdata)1667 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1668 {
1669 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1670 struct sta_info *sta;
1671
1672 sdata_lock(sdata);
1673
1674 /*
1675 * Work could be scheduled after scan or similar
1676 * when we aren't even joined (or trying) with a
1677 * network.
1678 */
1679 if (!ifibss->ssid_len)
1680 goto out;
1681
1682 spin_lock_bh(&ifibss->incomplete_lock);
1683 while (!list_empty(&ifibss->incomplete_stations)) {
1684 sta = list_first_entry(&ifibss->incomplete_stations,
1685 struct sta_info, list);
1686 list_del(&sta->list);
1687 spin_unlock_bh(&ifibss->incomplete_lock);
1688
1689 ieee80211_ibss_finish_sta(sta);
1690 rcu_read_unlock();
1691 spin_lock_bh(&ifibss->incomplete_lock);
1692 }
1693 spin_unlock_bh(&ifibss->incomplete_lock);
1694
1695 switch (ifibss->state) {
1696 case IEEE80211_IBSS_MLME_SEARCH:
1697 ieee80211_sta_find_ibss(sdata);
1698 break;
1699 case IEEE80211_IBSS_MLME_JOINED:
1700 ieee80211_sta_merge_ibss(sdata);
1701 break;
1702 default:
1703 WARN_ON(1);
1704 break;
1705 }
1706
1707 out:
1708 sdata_unlock(sdata);
1709 }
1710
ieee80211_ibss_timer(unsigned long data)1711 static void ieee80211_ibss_timer(unsigned long data)
1712 {
1713 struct ieee80211_sub_if_data *sdata =
1714 (struct ieee80211_sub_if_data *) data;
1715
1716 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1717 }
1718
ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data * sdata)1719 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1720 {
1721 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1722
1723 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1724 (unsigned long) sdata);
1725 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1726 spin_lock_init(&ifibss->incomplete_lock);
1727 INIT_WORK(&ifibss->csa_connection_drop_work,
1728 ieee80211_csa_connection_drop_work);
1729 }
1730
1731 /* scan finished notification */
ieee80211_ibss_notify_scan_completed(struct ieee80211_local * local)1732 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1733 {
1734 struct ieee80211_sub_if_data *sdata;
1735
1736 mutex_lock(&local->iflist_mtx);
1737 list_for_each_entry(sdata, &local->interfaces, list) {
1738 if (!ieee80211_sdata_running(sdata))
1739 continue;
1740 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1741 continue;
1742 sdata->u.ibss.last_scan_completed = jiffies;
1743 }
1744 mutex_unlock(&local->iflist_mtx);
1745 }
1746
ieee80211_ibss_join(struct ieee80211_sub_if_data * sdata,struct cfg80211_ibss_params * params)1747 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1748 struct cfg80211_ibss_params *params)
1749 {
1750 u32 changed = 0;
1751 u32 rate_flags;
1752 struct ieee80211_supported_band *sband;
1753 enum ieee80211_chanctx_mode chanmode;
1754 struct ieee80211_local *local = sdata->local;
1755 int radar_detect_width = 0;
1756 int i;
1757 int ret;
1758
1759 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1760 ¶ms->chandef,
1761 sdata->wdev.iftype);
1762 if (ret < 0)
1763 return ret;
1764
1765 if (ret > 0) {
1766 if (!params->userspace_handles_dfs)
1767 return -EINVAL;
1768 radar_detect_width = BIT(params->chandef.width);
1769 }
1770
1771 chanmode = (params->channel_fixed && !ret) ?
1772 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1773
1774 mutex_lock(&local->chanctx_mtx);
1775 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode,
1776 radar_detect_width);
1777 mutex_unlock(&local->chanctx_mtx);
1778 if (ret < 0)
1779 return ret;
1780
1781 if (params->bssid) {
1782 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1783 sdata->u.ibss.fixed_bssid = true;
1784 } else
1785 sdata->u.ibss.fixed_bssid = false;
1786
1787 sdata->u.ibss.privacy = params->privacy;
1788 sdata->u.ibss.control_port = params->control_port;
1789 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1790 sdata->u.ibss.basic_rates = params->basic_rates;
1791 sdata->u.ibss.last_scan_completed = jiffies;
1792
1793 /* fix basic_rates if channel does not support these rates */
1794 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef);
1795 sband = local->hw.wiphy->bands[params->chandef.chan->band];
1796 for (i = 0; i < sband->n_bitrates; i++) {
1797 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1798 sdata->u.ibss.basic_rates &= ~BIT(i);
1799 }
1800 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1801 sizeof(params->mcast_rate));
1802
1803 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1804
1805 sdata->u.ibss.chandef = params->chandef;
1806 sdata->u.ibss.fixed_channel = params->channel_fixed;
1807
1808 if (params->ie) {
1809 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1810 GFP_KERNEL);
1811 if (sdata->u.ibss.ie)
1812 sdata->u.ibss.ie_len = params->ie_len;
1813 }
1814
1815 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1816 sdata->u.ibss.ibss_join_req = jiffies;
1817
1818 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1819 sdata->u.ibss.ssid_len = params->ssid_len;
1820
1821 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa,
1822 sizeof(sdata->u.ibss.ht_capa));
1823 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask,
1824 sizeof(sdata->u.ibss.ht_capa_mask));
1825
1826 /*
1827 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1828 * reserved, but an HT STA shall protect HT transmissions as though
1829 * the HT Protection field were set to non-HT mixed mode.
1830 *
1831 * In an IBSS, the RIFS Mode field of the HT Operation element is
1832 * also reserved, but an HT STA shall operate as though this field
1833 * were set to 1.
1834 */
1835
1836 sdata->vif.bss_conf.ht_operation_mode |=
1837 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1838 | IEEE80211_HT_PARAM_RIFS_MODE;
1839
1840 changed |= BSS_CHANGED_HT;
1841 ieee80211_bss_info_change_notify(sdata, changed);
1842
1843 sdata->smps_mode = IEEE80211_SMPS_OFF;
1844 sdata->needed_rx_chains = local->rx_chains;
1845
1846 ieee80211_queue_work(&local->hw, &sdata->work);
1847
1848 return 0;
1849 }
1850
ieee80211_ibss_leave(struct ieee80211_sub_if_data * sdata)1851 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1852 {
1853 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1854
1855 ieee80211_ibss_disconnect(sdata);
1856 ifibss->ssid_len = 0;
1857 eth_zero_addr(ifibss->bssid);
1858
1859 /* remove beacon */
1860 kfree(sdata->u.ibss.ie);
1861
1862 /* on the next join, re-program HT parameters */
1863 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1864 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1865
1866 synchronize_rcu();
1867
1868 skb_queue_purge(&sdata->skb_queue);
1869
1870 del_timer_sync(&sdata->u.ibss.timer);
1871
1872 return 0;
1873 }
1874