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[mirror_ubuntu-bionic-kernel.git] / net / mac80211 / ibss.c
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 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14
15 #include <linux/delay.h>
16 #include <linux/slab.h>
17 #include <linux/if_ether.h>
18 #include <linux/skbuff.h>
19 #include <linux/if_arp.h>
20 #include <linux/etherdevice.h>
21 #include <linux/rtnetlink.h>
22 #include <net/mac80211.h>
23
24 #include "ieee80211_i.h"
25 #include "driver-ops.h"
26 #include "rate.h"
27
28 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
29 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
30
31 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
32 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
33 #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ)
34
35 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
36
37 static struct beacon_data *
38 ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata,
39 const int beacon_int, const u32 basic_rates,
40 const u16 capability, u64 tsf,
41 struct cfg80211_chan_def *chandef,
42 bool *have_higher_than_11mbit,
43 struct cfg80211_csa_settings *csa_settings)
44 {
45 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
46 struct ieee80211_local *local = sdata->local;
47 int rates_n = 0, i, ri;
48 struct ieee80211_mgmt *mgmt;
49 u8 *pos;
50 struct ieee80211_supported_band *sband;
51 u32 rate_flags, rates = 0, rates_added = 0;
52 struct beacon_data *presp;
53 int frame_len;
54 int shift;
55
56 /* Build IBSS probe response */
57 frame_len = sizeof(struct ieee80211_hdr_3addr) +
58 12 /* struct ieee80211_mgmt.u.beacon */ +
59 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
60 2 + 8 /* max Supported Rates */ +
61 3 /* max DS params */ +
62 4 /* IBSS params */ +
63 5 /* Channel Switch Announcement */ +
64 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
65 2 + sizeof(struct ieee80211_ht_cap) +
66 2 + sizeof(struct ieee80211_ht_operation) +
67 ifibss->ie_len;
68 presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
69 if (!presp)
70 return NULL;
71
72 presp->head = (void *)(presp + 1);
73
74 mgmt = (void *) presp->head;
75 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
76 IEEE80211_STYPE_PROBE_RESP);
77 eth_broadcast_addr(mgmt->da);
78 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
79 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
80 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
81 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
82 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
83
84 pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
85
86 *pos++ = WLAN_EID_SSID;
87 *pos++ = ifibss->ssid_len;
88 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
89 pos += ifibss->ssid_len;
90
91 sband = local->hw.wiphy->bands[chandef->chan->band];
92 rate_flags = ieee80211_chandef_rate_flags(chandef);
93 shift = ieee80211_chandef_get_shift(chandef);
94 rates_n = 0;
95 if (have_higher_than_11mbit)
96 *have_higher_than_11mbit = false;
97
98 for (i = 0; i < sband->n_bitrates; i++) {
99 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
100 continue;
101 if (sband->bitrates[i].bitrate > 110 &&
102 have_higher_than_11mbit)
103 *have_higher_than_11mbit = true;
104
105 rates |= BIT(i);
106 rates_n++;
107 }
108
109 *pos++ = WLAN_EID_SUPP_RATES;
110 *pos++ = min_t(int, 8, rates_n);
111 for (ri = 0; ri < sband->n_bitrates; ri++) {
112 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
113 5 * (1 << shift));
114 u8 basic = 0;
115 if (!(rates & BIT(ri)))
116 continue;
117
118 if (basic_rates & BIT(ri))
119 basic = 0x80;
120 *pos++ = basic | (u8) rate;
121 if (++rates_added == 8) {
122 ri++; /* continue at next rate for EXT_SUPP_RATES */
123 break;
124 }
125 }
126
127 if (sband->band == IEEE80211_BAND_2GHZ) {
128 *pos++ = WLAN_EID_DS_PARAMS;
129 *pos++ = 1;
130 *pos++ = ieee80211_frequency_to_channel(
131 chandef->chan->center_freq);
132 }
133
134 *pos++ = WLAN_EID_IBSS_PARAMS;
135 *pos++ = 2;
136 /* FIX: set ATIM window based on scan results */
137 *pos++ = 0;
138 *pos++ = 0;
139
140 if (csa_settings) {
141 *pos++ = WLAN_EID_CHANNEL_SWITCH;
142 *pos++ = 3;
143 *pos++ = csa_settings->block_tx ? 1 : 0;
144 *pos++ = ieee80211_frequency_to_channel(
145 csa_settings->chandef.chan->center_freq);
146 sdata->csa_counter_offset_beacon = (pos - presp->head);
147 *pos++ = csa_settings->count;
148 }
149
150 /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
151 if (rates_n > 8) {
152 *pos++ = WLAN_EID_EXT_SUPP_RATES;
153 *pos++ = rates_n - 8;
154 for (; ri < sband->n_bitrates; ri++) {
155 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
156 5 * (1 << shift));
157 u8 basic = 0;
158 if (!(rates & BIT(ri)))
159 continue;
160
161 if (basic_rates & BIT(ri))
162 basic = 0x80;
163 *pos++ = basic | (u8) rate;
164 }
165 }
166
167 if (ifibss->ie_len) {
168 memcpy(pos, ifibss->ie, ifibss->ie_len);
169 pos += ifibss->ie_len;
170 }
171
172 /* add HT capability and information IEs */
173 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
174 chandef->width != NL80211_CHAN_WIDTH_5 &&
175 chandef->width != NL80211_CHAN_WIDTH_10 &&
176 sband->ht_cap.ht_supported) {
177 struct ieee80211_sta_ht_cap ht_cap;
178
179 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
180 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
181
182 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
183 /*
184 * Note: According to 802.11n-2009 9.13.3.1, HT Protection
185 * field and RIFS Mode are reserved in IBSS mode, therefore
186 * keep them at 0
187 */
188 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
189 chandef, 0);
190 }
191
192 if (local->hw.queues >= IEEE80211_NUM_ACS) {
193 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
194 *pos++ = 7; /* len */
195 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
196 *pos++ = 0x50;
197 *pos++ = 0xf2;
198 *pos++ = 2; /* WME */
199 *pos++ = 0; /* WME info */
200 *pos++ = 1; /* WME ver */
201 *pos++ = 0; /* U-APSD no in use */
202 }
203
204 presp->head_len = pos - presp->head;
205 if (WARN_ON(presp->head_len > frame_len))
206 goto error;
207
208 return presp;
209 error:
210 kfree(presp);
211 return NULL;
212 }
213
214 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
215 const u8 *bssid, const int beacon_int,
216 struct cfg80211_chan_def *req_chandef,
217 const u32 basic_rates,
218 const u16 capability, u64 tsf,
219 bool creator)
220 {
221 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
222 struct ieee80211_local *local = sdata->local;
223 struct ieee80211_supported_band *sband;
224 struct ieee80211_mgmt *mgmt;
225 struct cfg80211_bss *bss;
226 u32 bss_change;
227 struct cfg80211_chan_def chandef;
228 struct ieee80211_channel *chan;
229 struct beacon_data *presp;
230 enum nl80211_bss_scan_width scan_width;
231 bool have_higher_than_11mbit;
232 bool radar_required = false;
233 int err;
234
235 sdata_assert_lock(sdata);
236
237 /* Reset own TSF to allow time synchronization work. */
238 drv_reset_tsf(local, sdata);
239
240 if (!ether_addr_equal(ifibss->bssid, bssid))
241 sta_info_flush(sdata);
242
243 /* if merging, indicate to driver that we leave the old IBSS */
244 if (sdata->vif.bss_conf.ibss_joined) {
245 sdata->vif.bss_conf.ibss_joined = false;
246 sdata->vif.bss_conf.ibss_creator = false;
247 sdata->vif.bss_conf.enable_beacon = false;
248 netif_carrier_off(sdata->dev);
249 ieee80211_bss_info_change_notify(sdata,
250 BSS_CHANGED_IBSS |
251 BSS_CHANGED_BEACON_ENABLED);
252 drv_leave_ibss(local, sdata);
253 }
254
255 presp = rcu_dereference_protected(ifibss->presp,
256 lockdep_is_held(&sdata->wdev.mtx));
257 rcu_assign_pointer(ifibss->presp, NULL);
258 if (presp)
259 kfree_rcu(presp, rcu_head);
260
261 sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
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 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
268 chandef.width == NL80211_CHAN_WIDTH_10 ||
269 chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
270 chandef.width == NL80211_CHAN_WIDTH_20) {
271 sdata_info(sdata,
272 "Failed to join IBSS, beacons forbidden\n");
273 return;
274 }
275 chandef.width = NL80211_CHAN_WIDTH_20;
276 chandef.center_freq1 = chan->center_freq;
277 /* check again for downgraded chandef */
278 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) {
279 sdata_info(sdata,
280 "Failed to join IBSS, beacons forbidden\n");
281 return;
282 }
283 }
284
285 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
286 &chandef);
287 if (err > 0) {
288 if (!ifibss->userspace_handles_dfs) {
289 sdata_info(sdata,
290 "Failed to join IBSS, DFS channel without control program\n");
291 return;
292 }
293 radar_required = true;
294 }
295
296 mutex_lock(&local->mtx);
297 ieee80211_vif_release_channel(sdata);
298 if (ieee80211_vif_use_channel(sdata, &chandef,
299 ifibss->fixed_channel ?
300 IEEE80211_CHANCTX_SHARED :
301 IEEE80211_CHANCTX_EXCLUSIVE)) {
302 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
303 mutex_unlock(&local->mtx);
304 return;
305 }
306 mutex_unlock(&local->mtx);
307
308 memcpy(ifibss->bssid, bssid, ETH_ALEN);
309
310 sband = local->hw.wiphy->bands[chan->band];
311
312 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
313 capability, tsf, &chandef,
314 &have_higher_than_11mbit, NULL);
315 if (!presp)
316 return;
317
318 rcu_assign_pointer(ifibss->presp, presp);
319 mgmt = (void *)presp->head;
320
321 sdata->radar_required = radar_required;
322 sdata->vif.bss_conf.enable_beacon = true;
323 sdata->vif.bss_conf.beacon_int = beacon_int;
324 sdata->vif.bss_conf.basic_rates = basic_rates;
325 sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
326 memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
327 bss_change = BSS_CHANGED_BEACON_INT;
328 bss_change |= ieee80211_reset_erp_info(sdata);
329 bss_change |= BSS_CHANGED_BSSID;
330 bss_change |= BSS_CHANGED_BEACON;
331 bss_change |= BSS_CHANGED_BEACON_ENABLED;
332 bss_change |= BSS_CHANGED_BASIC_RATES;
333 bss_change |= BSS_CHANGED_HT;
334 bss_change |= BSS_CHANGED_IBSS;
335 bss_change |= BSS_CHANGED_SSID;
336
337 /*
338 * In 5 GHz/802.11a, we can always use short slot time.
339 * (IEEE 802.11-2012 18.3.8.7)
340 *
341 * In 2.4GHz, we must always use long slots in IBSS for compatibility
342 * reasons.
343 * (IEEE 802.11-2012 19.4.5)
344 *
345 * HT follows these specifications (IEEE 802.11-2012 20.3.18)
346 */
347 sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ;
348 bss_change |= BSS_CHANGED_ERP_SLOT;
349
350 /* cf. IEEE 802.11 9.2.12 */
351 if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit)
352 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
353 else
354 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
355
356 ieee80211_set_wmm_default(sdata, true);
357
358 sdata->vif.bss_conf.ibss_joined = true;
359 sdata->vif.bss_conf.ibss_creator = creator;
360
361 err = drv_join_ibss(local, sdata);
362 if (err) {
363 sdata->vif.bss_conf.ibss_joined = false;
364 sdata->vif.bss_conf.ibss_creator = false;
365 sdata->vif.bss_conf.enable_beacon = false;
366 sdata->vif.bss_conf.ssid_len = 0;
367 RCU_INIT_POINTER(ifibss->presp, NULL);
368 kfree_rcu(presp, rcu_head);
369 mutex_lock(&local->mtx);
370 ieee80211_vif_release_channel(sdata);
371 mutex_unlock(&local->mtx);
372 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
373 err);
374 return;
375 }
376
377 ieee80211_bss_info_change_notify(sdata, bss_change);
378
379 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
380 mod_timer(&ifibss->timer,
381 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
382
383 scan_width = cfg80211_chandef_to_scan_width(&chandef);
384 bss = cfg80211_inform_bss_width_frame(local->hw.wiphy, chan,
385 scan_width, mgmt,
386 presp->head_len, 0, GFP_KERNEL);
387 cfg80211_put_bss(local->hw.wiphy, bss);
388 netif_carrier_on(sdata->dev);
389 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
390 }
391
392 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
393 struct ieee80211_bss *bss)
394 {
395 struct cfg80211_bss *cbss =
396 container_of((void *)bss, struct cfg80211_bss, priv);
397 struct ieee80211_supported_band *sband;
398 struct cfg80211_chan_def chandef;
399 u32 basic_rates;
400 int i, j;
401 u16 beacon_int = cbss->beacon_interval;
402 const struct cfg80211_bss_ies *ies;
403 enum nl80211_channel_type chan_type;
404 u64 tsf;
405 u32 rate_flags;
406 int shift;
407
408 sdata_assert_lock(sdata);
409
410 if (beacon_int < 10)
411 beacon_int = 10;
412
413 switch (sdata->u.ibss.chandef.width) {
414 case NL80211_CHAN_WIDTH_20_NOHT:
415 case NL80211_CHAN_WIDTH_20:
416 case NL80211_CHAN_WIDTH_40:
417 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
418 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
419 break;
420 case NL80211_CHAN_WIDTH_5:
421 case NL80211_CHAN_WIDTH_10:
422 cfg80211_chandef_create(&chandef, cbss->channel,
423 NL80211_CHAN_WIDTH_20_NOHT);
424 chandef.width = sdata->u.ibss.chandef.width;
425 break;
426 default:
427 /* fall back to 20 MHz for unsupported modes */
428 cfg80211_chandef_create(&chandef, cbss->channel,
429 NL80211_CHAN_WIDTH_20_NOHT);
430 break;
431 }
432
433 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
434 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
435 shift = ieee80211_vif_get_shift(&sdata->vif);
436
437 basic_rates = 0;
438
439 for (i = 0; i < bss->supp_rates_len; i++) {
440 int rate = bss->supp_rates[i] & 0x7f;
441 bool is_basic = !!(bss->supp_rates[i] & 0x80);
442
443 for (j = 0; j < sband->n_bitrates; j++) {
444 int brate;
445 if ((rate_flags & sband->bitrates[j].flags)
446 != rate_flags)
447 continue;
448
449 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
450 5 * (1 << shift));
451 if (brate == rate) {
452 if (is_basic)
453 basic_rates |= BIT(j);
454 break;
455 }
456 }
457 }
458
459 rcu_read_lock();
460 ies = rcu_dereference(cbss->ies);
461 tsf = ies->tsf;
462 rcu_read_unlock();
463
464 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
465 beacon_int,
466 &chandef,
467 basic_rates,
468 cbss->capability,
469 tsf, false);
470 }
471
472 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
473 struct cfg80211_csa_settings *csa_settings)
474 {
475 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
476 struct beacon_data *presp, *old_presp;
477 struct cfg80211_bss *cbss;
478 const struct cfg80211_bss_ies *ies;
479 u16 capability;
480 u64 tsf;
481 int ret = 0;
482
483 sdata_assert_lock(sdata);
484
485 capability = WLAN_CAPABILITY_IBSS;
486
487 if (ifibss->privacy)
488 capability |= WLAN_CAPABILITY_PRIVACY;
489
490 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
491 ifibss->bssid, ifibss->ssid,
492 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
493 WLAN_CAPABILITY_PRIVACY,
494 capability);
495
496 if (WARN_ON(!cbss)) {
497 ret = -EINVAL;
498 goto out;
499 }
500
501 rcu_read_lock();
502 ies = rcu_dereference(cbss->ies);
503 tsf = ies->tsf;
504 rcu_read_unlock();
505 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
506
507 old_presp = rcu_dereference_protected(ifibss->presp,
508 lockdep_is_held(&sdata->wdev.mtx));
509
510 presp = ieee80211_ibss_build_presp(sdata,
511 sdata->vif.bss_conf.beacon_int,
512 sdata->vif.bss_conf.basic_rates,
513 capability, tsf, &ifibss->chandef,
514 NULL, csa_settings);
515 if (!presp) {
516 ret = -ENOMEM;
517 goto out;
518 }
519
520 rcu_assign_pointer(ifibss->presp, presp);
521 if (old_presp)
522 kfree_rcu(old_presp, rcu_head);
523
524 /* it might not send the beacon for a while. send an action frame
525 * immediately to announce the channel switch.
526 */
527 if (csa_settings)
528 ieee80211_send_action_csa(sdata, csa_settings);
529
530 return BSS_CHANGED_BEACON;
531 out:
532 return ret;
533 }
534
535 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
536 {
537 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
538 struct cfg80211_bss *cbss;
539 int err;
540 u16 capability;
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 capability = WLAN_CAPABILITY_IBSS;
547
548 if (ifibss->privacy)
549 capability |= WLAN_CAPABILITY_PRIVACY;
550
551 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
552 ifibss->chandef.chan,
553 ifibss->bssid, ifibss->ssid,
554 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
555 WLAN_CAPABILITY_PRIVACY,
556 capability);
557 /* XXX: should not really modify cfg80211 data */
558 if (cbss) {
559 cbss->channel = sdata->csa_chandef.chan;
560 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
561 }
562 }
563
564 ifibss->chandef = sdata->csa_chandef;
565
566 /* generate the beacon */
567 err = ieee80211_ibss_csa_beacon(sdata, NULL);
568 if (err < 0)
569 return err;
570
571 if (err)
572 ieee80211_bss_info_change_notify(sdata, err);
573
574 return 0;
575 }
576
577 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
578 {
579 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
580
581 cancel_work_sync(&ifibss->csa_connection_drop_work);
582 }
583
584 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
585 __acquires(RCU)
586 {
587 struct ieee80211_sub_if_data *sdata = sta->sdata;
588 u8 addr[ETH_ALEN];
589
590 memcpy(addr, sta->sta.addr, ETH_ALEN);
591
592 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
593
594 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
595 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
596 /* authorize the station only if the network is not RSN protected. If
597 * not wait for the userspace to authorize it */
598 if (!sta->sdata->u.ibss.control_port)
599 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
600
601 rate_control_rate_init(sta);
602
603 /* If it fails, maybe we raced another insertion? */
604 if (sta_info_insert_rcu(sta))
605 return sta_info_get(sdata, addr);
606 return sta;
607 }
608
609 static struct sta_info *
610 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
611 const u8 *addr, u32 supp_rates)
612 __acquires(RCU)
613 {
614 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
615 struct ieee80211_local *local = sdata->local;
616 struct sta_info *sta;
617 struct ieee80211_chanctx_conf *chanctx_conf;
618 struct ieee80211_supported_band *sband;
619 enum nl80211_bss_scan_width scan_width;
620 int band;
621
622 /*
623 * XXX: Consider removing the least recently used entry and
624 * allow new one to be added.
625 */
626 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
627 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
628 sdata->name, addr);
629 rcu_read_lock();
630 return NULL;
631 }
632
633 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
634 rcu_read_lock();
635 return NULL;
636 }
637
638 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
639 rcu_read_lock();
640 return NULL;
641 }
642
643 rcu_read_lock();
644 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
645 if (WARN_ON_ONCE(!chanctx_conf))
646 return NULL;
647 band = chanctx_conf->def.chan->band;
648 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
649 rcu_read_unlock();
650
651 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
652 if (!sta) {
653 rcu_read_lock();
654 return NULL;
655 }
656
657 sta->last_rx = jiffies;
658
659 /* make sure mandatory rates are always added */
660 sband = local->hw.wiphy->bands[band];
661 sta->sta.supp_rates[band] = supp_rates |
662 ieee80211_mandatory_rates(sband, scan_width);
663
664 return ieee80211_ibss_finish_sta(sta);
665 }
666
667 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
668 {
669 struct ieee80211_local *local = sdata->local;
670 int active = 0;
671 struct sta_info *sta;
672
673 sdata_assert_lock(sdata);
674
675 rcu_read_lock();
676
677 list_for_each_entry_rcu(sta, &local->sta_list, list) {
678 if (sta->sdata == sdata &&
679 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
680 jiffies)) {
681 active++;
682 break;
683 }
684 }
685
686 rcu_read_unlock();
687
688 return active;
689 }
690
691 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
692 {
693 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
694 struct ieee80211_local *local = sdata->local;
695 struct cfg80211_bss *cbss;
696 struct beacon_data *presp;
697 struct sta_info *sta;
698 int active_ibss;
699 u16 capability;
700
701 active_ibss = ieee80211_sta_active_ibss(sdata);
702
703 if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) {
704 capability = WLAN_CAPABILITY_IBSS;
705
706 if (ifibss->privacy)
707 capability |= WLAN_CAPABILITY_PRIVACY;
708
709 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
710 ifibss->bssid, ifibss->ssid,
711 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
712 WLAN_CAPABILITY_PRIVACY,
713 capability);
714
715 if (cbss) {
716 cfg80211_unlink_bss(local->hw.wiphy, cbss);
717 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
718 }
719 }
720
721 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
722
723 sta_info_flush(sdata);
724
725 spin_lock_bh(&ifibss->incomplete_lock);
726 while (!list_empty(&ifibss->incomplete_stations)) {
727 sta = list_first_entry(&ifibss->incomplete_stations,
728 struct sta_info, list);
729 list_del(&sta->list);
730 spin_unlock_bh(&ifibss->incomplete_lock);
731
732 sta_info_free(local, sta);
733 spin_lock_bh(&ifibss->incomplete_lock);
734 }
735 spin_unlock_bh(&ifibss->incomplete_lock);
736
737 netif_carrier_off(sdata->dev);
738
739 sdata->vif.bss_conf.ibss_joined = false;
740 sdata->vif.bss_conf.ibss_creator = false;
741 sdata->vif.bss_conf.enable_beacon = false;
742 sdata->vif.bss_conf.ssid_len = 0;
743
744 /* remove beacon */
745 presp = rcu_dereference_protected(ifibss->presp,
746 lockdep_is_held(&sdata->wdev.mtx));
747 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
748 if (presp)
749 kfree_rcu(presp, rcu_head);
750
751 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
752 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
753 BSS_CHANGED_IBSS);
754 drv_leave_ibss(local, sdata);
755 mutex_lock(&local->mtx);
756 ieee80211_vif_release_channel(sdata);
757 mutex_unlock(&local->mtx);
758 }
759
760 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
761 {
762 struct ieee80211_sub_if_data *sdata =
763 container_of(work, struct ieee80211_sub_if_data,
764 u.ibss.csa_connection_drop_work);
765
766 sdata_lock(sdata);
767
768 ieee80211_ibss_disconnect(sdata);
769 synchronize_rcu();
770 skb_queue_purge(&sdata->skb_queue);
771
772 /* trigger a scan to find another IBSS network to join */
773 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
774
775 sdata_unlock(sdata);
776 }
777
778 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
779 {
780 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
781 int err;
782
783 /* if the current channel is a DFS channel, mark the channel as
784 * unavailable.
785 */
786 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
787 &ifibss->chandef);
788 if (err > 0)
789 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
790 GFP_ATOMIC);
791 }
792
793 static bool
794 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
795 struct ieee802_11_elems *elems,
796 bool beacon)
797 {
798 struct cfg80211_csa_settings params;
799 struct ieee80211_csa_ie csa_ie;
800 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
801 enum nl80211_channel_type ch_type;
802 int err;
803 u32 sta_flags;
804
805 sta_flags = IEEE80211_STA_DISABLE_VHT;
806 switch (ifibss->chandef.width) {
807 case NL80211_CHAN_WIDTH_5:
808 case NL80211_CHAN_WIDTH_10:
809 case NL80211_CHAN_WIDTH_20_NOHT:
810 sta_flags |= IEEE80211_STA_DISABLE_HT;
811 /* fall through */
812 case NL80211_CHAN_WIDTH_20:
813 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
814 break;
815 default:
816 break;
817 }
818
819 memset(&params, 0, sizeof(params));
820 memset(&csa_ie, 0, sizeof(csa_ie));
821 err = ieee80211_parse_ch_switch_ie(sdata, elems, beacon,
822 ifibss->chandef.chan->band,
823 sta_flags, ifibss->bssid, &csa_ie);
824 /* can't switch to destination channel, fail */
825 if (err < 0)
826 goto disconnect;
827
828 /* did not contain a CSA */
829 if (err)
830 return false;
831
832 /* channel switch is not supported, disconnect */
833 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
834 goto disconnect;
835
836 params.count = csa_ie.count;
837 params.chandef = csa_ie.chandef;
838
839 switch (ifibss->chandef.width) {
840 case NL80211_CHAN_WIDTH_20_NOHT:
841 case NL80211_CHAN_WIDTH_20:
842 case NL80211_CHAN_WIDTH_40:
843 /* keep our current HT mode (HT20/HT40+/HT40-), even if
844 * another mode has been announced. The mode is not adopted
845 * within the beacon while doing CSA and we should therefore
846 * keep the mode which we announce.
847 */
848 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
849 cfg80211_chandef_create(&params.chandef, params.chandef.chan,
850 ch_type);
851 break;
852 case NL80211_CHAN_WIDTH_5:
853 case NL80211_CHAN_WIDTH_10:
854 if (params.chandef.width != ifibss->chandef.width) {
855 sdata_info(sdata,
856 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
857 ifibss->bssid,
858 params.chandef.chan->center_freq,
859 params.chandef.width,
860 params.chandef.center_freq1,
861 params.chandef.center_freq2);
862 goto disconnect;
863 }
864 break;
865 default:
866 /* should not happen, sta_flags should prevent VHT modes. */
867 WARN_ON(1);
868 goto disconnect;
869 }
870
871 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef)) {
872 sdata_info(sdata,
873 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
874 ifibss->bssid,
875 params.chandef.chan->center_freq,
876 params.chandef.width,
877 params.chandef.center_freq1,
878 params.chandef.center_freq2);
879 goto disconnect;
880 }
881
882 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
883 &params.chandef);
884 if (err < 0)
885 goto disconnect;
886 if (err) {
887 /* IBSS-DFS only allowed with a control program */
888 if (!ifibss->userspace_handles_dfs)
889 goto disconnect;
890
891 params.radar_required = true;
892 }
893
894 if (cfg80211_chandef_identical(&params.chandef,
895 &sdata->vif.bss_conf.chandef)) {
896 ibss_dbg(sdata,
897 "received csa with an identical chandef, ignoring\n");
898 return true;
899 }
900
901 /* all checks done, now perform the channel switch. */
902 ibss_dbg(sdata,
903 "received channel switch announcement to go to channel %d MHz\n",
904 params.chandef.chan->center_freq);
905
906 params.block_tx = !!csa_ie.mode;
907
908 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
909 &params))
910 goto disconnect;
911
912 ieee80211_ibss_csa_mark_radar(sdata);
913
914 return true;
915 disconnect:
916 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
917 ieee80211_queue_work(&sdata->local->hw,
918 &ifibss->csa_connection_drop_work);
919
920 ieee80211_ibss_csa_mark_radar(sdata);
921
922 return true;
923 }
924
925 static void
926 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
927 struct ieee80211_mgmt *mgmt, size_t len,
928 struct ieee80211_rx_status *rx_status,
929 struct ieee802_11_elems *elems)
930 {
931 int required_len;
932
933 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
934 return;
935
936 /* CSA is the only action we handle for now */
937 if (mgmt->u.action.u.measurement.action_code !=
938 WLAN_ACTION_SPCT_CHL_SWITCH)
939 return;
940
941 required_len = IEEE80211_MIN_ACTION_SIZE +
942 sizeof(mgmt->u.action.u.chan_switch);
943 if (len < required_len)
944 return;
945
946 if (!sdata->vif.csa_active)
947 ieee80211_ibss_process_chanswitch(sdata, elems, false);
948 }
949
950 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
951 struct ieee80211_mgmt *mgmt,
952 size_t len)
953 {
954 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
955
956 if (len < IEEE80211_DEAUTH_FRAME_LEN)
957 return;
958
959 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
960 mgmt->sa, mgmt->da, mgmt->bssid, reason);
961 sta_info_destroy_addr(sdata, mgmt->sa);
962 }
963
964 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
965 struct ieee80211_mgmt *mgmt,
966 size_t len)
967 {
968 u16 auth_alg, auth_transaction;
969
970 sdata_assert_lock(sdata);
971
972 if (len < 24 + 6)
973 return;
974
975 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
976 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
977
978 ibss_dbg(sdata,
979 "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
980 mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
981
982 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
983 return;
984
985 /*
986 * IEEE 802.11 standard does not require authentication in IBSS
987 * networks and most implementations do not seem to use it.
988 * However, try to reply to authentication attempts if someone
989 * has actually implemented this.
990 */
991 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
992 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
993 }
994
995 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
996 struct ieee80211_mgmt *mgmt, size_t len,
997 struct ieee80211_rx_status *rx_status,
998 struct ieee802_11_elems *elems)
999 {
1000 struct ieee80211_local *local = sdata->local;
1001 int freq;
1002 struct cfg80211_bss *cbss;
1003 struct ieee80211_bss *bss;
1004 struct sta_info *sta;
1005 struct ieee80211_channel *channel;
1006 u64 beacon_timestamp, rx_timestamp;
1007 u32 supp_rates = 0;
1008 enum ieee80211_band band = rx_status->band;
1009 enum nl80211_bss_scan_width scan_width;
1010 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
1011 bool rates_updated = false;
1012
1013 if (elems->ds_params)
1014 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
1015 band);
1016 else
1017 freq = rx_status->freq;
1018
1019 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1020
1021 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1022 return;
1023
1024 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1025 ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) {
1026
1027 rcu_read_lock();
1028 sta = sta_info_get(sdata, mgmt->sa);
1029
1030 if (elems->supp_rates) {
1031 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1032 band, NULL);
1033 if (sta) {
1034 u32 prev_rates;
1035
1036 prev_rates = sta->sta.supp_rates[band];
1037 /* make sure mandatory rates are always added */
1038 scan_width = NL80211_BSS_CHAN_WIDTH_20;
1039 if (rx_status->flag & RX_FLAG_5MHZ)
1040 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1041 if (rx_status->flag & RX_FLAG_10MHZ)
1042 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1043
1044 sta->sta.supp_rates[band] = supp_rates |
1045 ieee80211_mandatory_rates(sband,
1046 scan_width);
1047 if (sta->sta.supp_rates[band] != prev_rates) {
1048 ibss_dbg(sdata,
1049 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1050 sta->sta.addr, prev_rates,
1051 sta->sta.supp_rates[band]);
1052 rates_updated = true;
1053 }
1054 } else {
1055 rcu_read_unlock();
1056 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1057 mgmt->sa, supp_rates);
1058 }
1059 }
1060
1061 if (sta && elems->wmm_info)
1062 set_sta_flag(sta, WLAN_STA_WME);
1063
1064 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1065 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1066 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1067 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1068 /* we both use HT */
1069 struct ieee80211_ht_cap htcap_ie;
1070 struct cfg80211_chan_def chandef;
1071
1072 ieee80211_ht_oper_to_chandef(channel,
1073 elems->ht_operation,
1074 &chandef);
1075
1076 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1077
1078 /*
1079 * fall back to HT20 if we don't use or use
1080 * the other extension channel
1081 */
1082 if (chandef.center_freq1 !=
1083 sdata->u.ibss.chandef.center_freq1)
1084 htcap_ie.cap_info &=
1085 cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40);
1086
1087 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(
1088 sdata, sband, &htcap_ie, sta);
1089 }
1090
1091 if (sta && rates_updated) {
1092 drv_sta_rc_update(local, sdata, &sta->sta,
1093 IEEE80211_RC_SUPP_RATES_CHANGED);
1094 rate_control_rate_init(sta);
1095 }
1096
1097 rcu_read_unlock();
1098 }
1099
1100 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1101 channel);
1102 if (!bss)
1103 return;
1104
1105 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1106
1107 /* same for beacon and probe response */
1108 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1109
1110 /* check if we need to merge IBSS */
1111
1112 /* not an IBSS */
1113 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1114 goto put_bss;
1115
1116 /* different channel */
1117 if (sdata->u.ibss.fixed_channel &&
1118 sdata->u.ibss.chandef.chan != cbss->channel)
1119 goto put_bss;
1120
1121 /* different SSID */
1122 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1123 memcmp(elems->ssid, sdata->u.ibss.ssid,
1124 sdata->u.ibss.ssid_len))
1125 goto put_bss;
1126
1127 /* process channel switch */
1128 if (sdata->vif.csa_active ||
1129 ieee80211_ibss_process_chanswitch(sdata, elems, true))
1130 goto put_bss;
1131
1132 /* same BSSID */
1133 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1134 goto put_bss;
1135
1136 /* we use a fixed BSSID */
1137 if (sdata->u.ibss.fixed_bssid)
1138 goto put_bss;
1139
1140 if (ieee80211_have_rx_timestamp(rx_status)) {
1141 /* time when timestamp field was received */
1142 rx_timestamp =
1143 ieee80211_calculate_rx_timestamp(local, rx_status,
1144 len + FCS_LEN, 24);
1145 } else {
1146 /*
1147 * second best option: get current TSF
1148 * (will return -1 if not supported)
1149 */
1150 rx_timestamp = drv_get_tsf(local, sdata);
1151 }
1152
1153 ibss_dbg(sdata,
1154 "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1155 mgmt->sa, mgmt->bssid,
1156 (unsigned long long)rx_timestamp,
1157 (unsigned long long)beacon_timestamp,
1158 (unsigned long long)(rx_timestamp - beacon_timestamp),
1159 jiffies);
1160
1161 if (beacon_timestamp > rx_timestamp) {
1162 ibss_dbg(sdata,
1163 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1164 mgmt->bssid);
1165 ieee80211_sta_join_ibss(sdata, bss);
1166 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1167 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1168 supp_rates);
1169 rcu_read_unlock();
1170 }
1171
1172 put_bss:
1173 ieee80211_rx_bss_put(local, bss);
1174 }
1175
1176 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1177 const u8 *bssid, const u8 *addr,
1178 u32 supp_rates)
1179 {
1180 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1181 struct ieee80211_local *local = sdata->local;
1182 struct sta_info *sta;
1183 struct ieee80211_chanctx_conf *chanctx_conf;
1184 struct ieee80211_supported_band *sband;
1185 enum nl80211_bss_scan_width scan_width;
1186 int band;
1187
1188 /*
1189 * XXX: Consider removing the least recently used entry and
1190 * allow new one to be added.
1191 */
1192 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1193 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1194 sdata->name, addr);
1195 return;
1196 }
1197
1198 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1199 return;
1200
1201 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1202 return;
1203
1204 rcu_read_lock();
1205 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1206 if (WARN_ON_ONCE(!chanctx_conf)) {
1207 rcu_read_unlock();
1208 return;
1209 }
1210 band = chanctx_conf->def.chan->band;
1211 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1212 rcu_read_unlock();
1213
1214 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1215 if (!sta)
1216 return;
1217
1218 sta->last_rx = jiffies;
1219
1220 /* make sure mandatory rates are always added */
1221 sband = local->hw.wiphy->bands[band];
1222 sta->sta.supp_rates[band] = supp_rates |
1223 ieee80211_mandatory_rates(sband, scan_width);
1224
1225 spin_lock(&ifibss->incomplete_lock);
1226 list_add(&sta->list, &ifibss->incomplete_stations);
1227 spin_unlock(&ifibss->incomplete_lock);
1228 ieee80211_queue_work(&local->hw, &sdata->work);
1229 }
1230
1231 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1232 {
1233 struct ieee80211_local *local = sdata->local;
1234 struct sta_info *sta, *tmp;
1235 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1236 unsigned long exp_rsn_time = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1237
1238 mutex_lock(&local->sta_mtx);
1239
1240 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1241 if (sdata != sta->sdata)
1242 continue;
1243
1244 if (time_after(jiffies, sta->last_rx + exp_time) ||
1245 (time_after(jiffies, sta->last_rx + exp_rsn_time) &&
1246 sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1247 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1248 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1249 "not authorized " : "", sta->sta.addr);
1250
1251 WARN_ON(__sta_info_destroy(sta));
1252 }
1253 }
1254
1255 mutex_unlock(&local->sta_mtx);
1256 }
1257
1258 /*
1259 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1260 */
1261
1262 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1263 {
1264 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1265 enum nl80211_bss_scan_width scan_width;
1266
1267 sdata_assert_lock(sdata);
1268
1269 mod_timer(&ifibss->timer,
1270 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1271
1272 ieee80211_ibss_sta_expire(sdata);
1273
1274 if (time_before(jiffies, ifibss->last_scan_completed +
1275 IEEE80211_IBSS_MERGE_INTERVAL))
1276 return;
1277
1278 if (ieee80211_sta_active_ibss(sdata))
1279 return;
1280
1281 if (ifibss->fixed_channel)
1282 return;
1283
1284 sdata_info(sdata,
1285 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1286
1287 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1288 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1289 NULL, scan_width);
1290 }
1291
1292 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1293 {
1294 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1295 u8 bssid[ETH_ALEN];
1296 u16 capability;
1297 int i;
1298
1299 sdata_assert_lock(sdata);
1300
1301 if (ifibss->fixed_bssid) {
1302 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1303 } else {
1304 /* Generate random, not broadcast, locally administered BSSID. Mix in
1305 * own MAC address to make sure that devices that do not have proper
1306 * random number generator get different BSSID. */
1307 get_random_bytes(bssid, ETH_ALEN);
1308 for (i = 0; i < ETH_ALEN; i++)
1309 bssid[i] ^= sdata->vif.addr[i];
1310 bssid[0] &= ~0x01;
1311 bssid[0] |= 0x02;
1312 }
1313
1314 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1315
1316 capability = WLAN_CAPABILITY_IBSS;
1317
1318 if (ifibss->privacy)
1319 capability |= WLAN_CAPABILITY_PRIVACY;
1320 else
1321 sdata->drop_unencrypted = 0;
1322
1323 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1324 &ifibss->chandef, ifibss->basic_rates,
1325 capability, 0, true);
1326 }
1327
1328 /*
1329 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1330 */
1331
1332 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1333 {
1334 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1335 struct ieee80211_local *local = sdata->local;
1336 struct cfg80211_bss *cbss;
1337 struct ieee80211_channel *chan = NULL;
1338 const u8 *bssid = NULL;
1339 enum nl80211_bss_scan_width scan_width;
1340 int active_ibss;
1341 u16 capability;
1342
1343 sdata_assert_lock(sdata);
1344
1345 active_ibss = ieee80211_sta_active_ibss(sdata);
1346 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1347
1348 if (active_ibss)
1349 return;
1350
1351 capability = WLAN_CAPABILITY_IBSS;
1352 if (ifibss->privacy)
1353 capability |= WLAN_CAPABILITY_PRIVACY;
1354 if (ifibss->fixed_bssid)
1355 bssid = ifibss->bssid;
1356 if (ifibss->fixed_channel)
1357 chan = ifibss->chandef.chan;
1358 if (!is_zero_ether_addr(ifibss->bssid))
1359 bssid = ifibss->bssid;
1360 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1361 ifibss->ssid, ifibss->ssid_len,
1362 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
1363 capability);
1364
1365 if (cbss) {
1366 struct ieee80211_bss *bss;
1367
1368 bss = (void *)cbss->priv;
1369 ibss_dbg(sdata,
1370 "sta_find_ibss: selected %pM current %pM\n",
1371 cbss->bssid, ifibss->bssid);
1372 sdata_info(sdata,
1373 "Selected IBSS BSSID %pM based on configured SSID\n",
1374 cbss->bssid);
1375
1376 ieee80211_sta_join_ibss(sdata, bss);
1377 ieee80211_rx_bss_put(local, bss);
1378 return;
1379 }
1380
1381 /* if a fixed bssid and a fixed freq have been provided create the IBSS
1382 * directly and do not waste time scanning
1383 */
1384 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1385 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1386 bssid);
1387 ieee80211_sta_create_ibss(sdata);
1388 return;
1389 }
1390
1391
1392 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1393
1394 /* Selected IBSS not found in current scan results - try to scan */
1395 if (time_after(jiffies, ifibss->last_scan_completed +
1396 IEEE80211_SCAN_INTERVAL)) {
1397 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1398
1399 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1400 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1401 ifibss->ssid_len, chan,
1402 scan_width);
1403 } else {
1404 int interval = IEEE80211_SCAN_INTERVAL;
1405
1406 if (time_after(jiffies, ifibss->ibss_join_req +
1407 IEEE80211_IBSS_JOIN_TIMEOUT))
1408 ieee80211_sta_create_ibss(sdata);
1409
1410 mod_timer(&ifibss->timer,
1411 round_jiffies(jiffies + interval));
1412 }
1413 }
1414
1415 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1416 struct sk_buff *req)
1417 {
1418 struct ieee80211_mgmt *mgmt = (void *)req->data;
1419 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1420 struct ieee80211_local *local = sdata->local;
1421 int tx_last_beacon, len = req->len;
1422 struct sk_buff *skb;
1423 struct beacon_data *presp;
1424 u8 *pos, *end;
1425
1426 sdata_assert_lock(sdata);
1427
1428 presp = rcu_dereference_protected(ifibss->presp,
1429 lockdep_is_held(&sdata->wdev.mtx));
1430
1431 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1432 len < 24 + 2 || !presp)
1433 return;
1434
1435 tx_last_beacon = drv_tx_last_beacon(local);
1436
1437 ibss_dbg(sdata,
1438 "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
1439 mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
1440
1441 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1442 return;
1443
1444 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1445 !is_broadcast_ether_addr(mgmt->bssid))
1446 return;
1447
1448 end = ((u8 *) mgmt) + len;
1449 pos = mgmt->u.probe_req.variable;
1450 if (pos[0] != WLAN_EID_SSID ||
1451 pos + 2 + pos[1] > end) {
1452 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1453 mgmt->sa);
1454 return;
1455 }
1456 if (pos[1] != 0 &&
1457 (pos[1] != ifibss->ssid_len ||
1458 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1459 /* Ignore ProbeReq for foreign SSID */
1460 return;
1461 }
1462
1463 /* Reply with ProbeResp */
1464 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1465 if (!skb)
1466 return;
1467
1468 skb_reserve(skb, local->tx_headroom);
1469 memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
1470
1471 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1472 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1473 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1474 ieee80211_tx_skb(sdata, skb);
1475 }
1476
1477 static
1478 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1479 struct ieee80211_mgmt *mgmt, size_t len,
1480 struct ieee80211_rx_status *rx_status)
1481 {
1482 size_t baselen;
1483 struct ieee802_11_elems elems;
1484
1485 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1486 offsetof(typeof(mgmt->u.beacon), variable));
1487
1488 /*
1489 * either beacon or probe_resp but the variable field is at the
1490 * same offset
1491 */
1492 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1493 if (baselen > len)
1494 return;
1495
1496 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1497 false, &elems);
1498
1499 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1500 }
1501
1502 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1503 struct sk_buff *skb)
1504 {
1505 struct ieee80211_rx_status *rx_status;
1506 struct ieee80211_mgmt *mgmt;
1507 u16 fc;
1508 struct ieee802_11_elems elems;
1509 int ies_len;
1510
1511 rx_status = IEEE80211_SKB_RXCB(skb);
1512 mgmt = (struct ieee80211_mgmt *) skb->data;
1513 fc = le16_to_cpu(mgmt->frame_control);
1514
1515 sdata_lock(sdata);
1516
1517 if (!sdata->u.ibss.ssid_len)
1518 goto mgmt_out; /* not ready to merge yet */
1519
1520 switch (fc & IEEE80211_FCTL_STYPE) {
1521 case IEEE80211_STYPE_PROBE_REQ:
1522 ieee80211_rx_mgmt_probe_req(sdata, skb);
1523 break;
1524 case IEEE80211_STYPE_PROBE_RESP:
1525 case IEEE80211_STYPE_BEACON:
1526 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1527 rx_status);
1528 break;
1529 case IEEE80211_STYPE_AUTH:
1530 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1531 break;
1532 case IEEE80211_STYPE_DEAUTH:
1533 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1534 break;
1535 case IEEE80211_STYPE_ACTION:
1536 switch (mgmt->u.action.category) {
1537 case WLAN_CATEGORY_SPECTRUM_MGMT:
1538 ies_len = skb->len -
1539 offsetof(struct ieee80211_mgmt,
1540 u.action.u.chan_switch.variable);
1541
1542 if (ies_len < 0)
1543 break;
1544
1545 ieee802_11_parse_elems(
1546 mgmt->u.action.u.chan_switch.variable,
1547 ies_len, true, &elems);
1548
1549 if (elems.parse_error)
1550 break;
1551
1552 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1553 rx_status, &elems);
1554 break;
1555 }
1556 }
1557
1558 mgmt_out:
1559 sdata_unlock(sdata);
1560 }
1561
1562 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1563 {
1564 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1565 struct sta_info *sta;
1566
1567 sdata_lock(sdata);
1568
1569 /*
1570 * Work could be scheduled after scan or similar
1571 * when we aren't even joined (or trying) with a
1572 * network.
1573 */
1574 if (!ifibss->ssid_len)
1575 goto out;
1576
1577 spin_lock_bh(&ifibss->incomplete_lock);
1578 while (!list_empty(&ifibss->incomplete_stations)) {
1579 sta = list_first_entry(&ifibss->incomplete_stations,
1580 struct sta_info, list);
1581 list_del(&sta->list);
1582 spin_unlock_bh(&ifibss->incomplete_lock);
1583
1584 ieee80211_ibss_finish_sta(sta);
1585 rcu_read_unlock();
1586 spin_lock_bh(&ifibss->incomplete_lock);
1587 }
1588 spin_unlock_bh(&ifibss->incomplete_lock);
1589
1590 switch (ifibss->state) {
1591 case IEEE80211_IBSS_MLME_SEARCH:
1592 ieee80211_sta_find_ibss(sdata);
1593 break;
1594 case IEEE80211_IBSS_MLME_JOINED:
1595 ieee80211_sta_merge_ibss(sdata);
1596 break;
1597 default:
1598 WARN_ON(1);
1599 break;
1600 }
1601
1602 out:
1603 sdata_unlock(sdata);
1604 }
1605
1606 static void ieee80211_ibss_timer(unsigned long data)
1607 {
1608 struct ieee80211_sub_if_data *sdata =
1609 (struct ieee80211_sub_if_data *) data;
1610
1611 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1612 }
1613
1614 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1615 {
1616 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1617
1618 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1619 (unsigned long) sdata);
1620 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1621 spin_lock_init(&ifibss->incomplete_lock);
1622 INIT_WORK(&ifibss->csa_connection_drop_work,
1623 ieee80211_csa_connection_drop_work);
1624 }
1625
1626 /* scan finished notification */
1627 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1628 {
1629 struct ieee80211_sub_if_data *sdata;
1630
1631 mutex_lock(&local->iflist_mtx);
1632 list_for_each_entry(sdata, &local->interfaces, list) {
1633 if (!ieee80211_sdata_running(sdata))
1634 continue;
1635 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1636 continue;
1637 sdata->u.ibss.last_scan_completed = jiffies;
1638 ieee80211_queue_work(&local->hw, &sdata->work);
1639 }
1640 mutex_unlock(&local->iflist_mtx);
1641 }
1642
1643 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1644 struct cfg80211_ibss_params *params)
1645 {
1646 u32 changed = 0;
1647 u32 rate_flags;
1648 struct ieee80211_supported_band *sband;
1649 int i;
1650
1651 if (params->bssid) {
1652 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1653 sdata->u.ibss.fixed_bssid = true;
1654 } else
1655 sdata->u.ibss.fixed_bssid = false;
1656
1657 sdata->u.ibss.privacy = params->privacy;
1658 sdata->u.ibss.control_port = params->control_port;
1659 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1660 sdata->u.ibss.basic_rates = params->basic_rates;
1661
1662 /* fix basic_rates if channel does not support these rates */
1663 rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
1664 sband = sdata->local->hw.wiphy->bands[params->chandef.chan->band];
1665 for (i = 0; i < sband->n_bitrates; i++) {
1666 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1667 sdata->u.ibss.basic_rates &= ~BIT(i);
1668 }
1669 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1670 sizeof(params->mcast_rate));
1671
1672 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1673
1674 sdata->u.ibss.chandef = params->chandef;
1675 sdata->u.ibss.fixed_channel = params->channel_fixed;
1676
1677 if (params->ie) {
1678 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1679 GFP_KERNEL);
1680 if (sdata->u.ibss.ie)
1681 sdata->u.ibss.ie_len = params->ie_len;
1682 }
1683
1684 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1685 sdata->u.ibss.ibss_join_req = jiffies;
1686
1687 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1688 sdata->u.ibss.ssid_len = params->ssid_len;
1689
1690 memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1691 sizeof(sdata->u.ibss.ht_capa));
1692 memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1693 sizeof(sdata->u.ibss.ht_capa_mask));
1694
1695 /*
1696 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1697 * reserved, but an HT STA shall protect HT transmissions as though
1698 * the HT Protection field were set to non-HT mixed mode.
1699 *
1700 * In an IBSS, the RIFS Mode field of the HT Operation element is
1701 * also reserved, but an HT STA shall operate as though this field
1702 * were set to 1.
1703 */
1704
1705 sdata->vif.bss_conf.ht_operation_mode |=
1706 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1707 | IEEE80211_HT_PARAM_RIFS_MODE;
1708
1709 changed |= BSS_CHANGED_HT;
1710 ieee80211_bss_info_change_notify(sdata, changed);
1711
1712 sdata->smps_mode = IEEE80211_SMPS_OFF;
1713 sdata->needed_rx_chains = sdata->local->rx_chains;
1714
1715 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1716
1717 return 0;
1718 }
1719
1720 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1721 {
1722 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1723
1724 ieee80211_ibss_disconnect(sdata);
1725 ifibss->ssid_len = 0;
1726 memset(ifibss->bssid, 0, ETH_ALEN);
1727
1728 /* remove beacon */
1729 kfree(sdata->u.ibss.ie);
1730
1731 /* on the next join, re-program HT parameters */
1732 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1733 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1734
1735 synchronize_rcu();
1736
1737 skb_queue_purge(&sdata->skb_queue);
1738
1739 del_timer_sync(&sdata->u.ibss.timer);
1740
1741 return 0;
1742 }
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