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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi...
[mirror_ubuntu-zesty-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 {
44 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
45 struct ieee80211_local *local = sdata->local;
46 int rates_n = 0, i, ri;
47 struct ieee80211_mgmt *mgmt;
48 u8 *pos;
49 struct ieee80211_supported_band *sband;
50 u32 rate_flags, rates = 0, rates_added = 0;
51 struct beacon_data *presp;
52 int frame_len;
53 int shift;
54
55 /* Build IBSS probe response */
56 frame_len = sizeof(struct ieee80211_hdr_3addr) +
57 12 /* struct ieee80211_mgmt.u.beacon */ +
58 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
59 2 + 8 /* max Supported Rates */ +
60 3 /* max DS params */ +
61 4 /* IBSS params */ +
62 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
63 2 + sizeof(struct ieee80211_ht_cap) +
64 2 + sizeof(struct ieee80211_ht_operation) +
65 ifibss->ie_len;
66 presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
67 if (!presp)
68 return NULL;
69
70 presp->head = (void *)(presp + 1);
71
72 mgmt = (void *) presp->head;
73 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
74 IEEE80211_STYPE_PROBE_RESP);
75 eth_broadcast_addr(mgmt->da);
76 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
77 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
78 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
79 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
80 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
81
82 pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
83
84 *pos++ = WLAN_EID_SSID;
85 *pos++ = ifibss->ssid_len;
86 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
87 pos += ifibss->ssid_len;
88
89 sband = local->hw.wiphy->bands[chandef->chan->band];
90 rate_flags = ieee80211_chandef_rate_flags(chandef);
91 shift = ieee80211_chandef_get_shift(chandef);
92 rates_n = 0;
93 if (have_higher_than_11mbit)
94 *have_higher_than_11mbit = false;
95
96 for (i = 0; i < sband->n_bitrates; i++) {
97 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
98 continue;
99 if (sband->bitrates[i].bitrate > 110 &&
100 have_higher_than_11mbit)
101 *have_higher_than_11mbit = true;
102
103 rates |= BIT(i);
104 rates_n++;
105 }
106
107 *pos++ = WLAN_EID_SUPP_RATES;
108 *pos++ = min_t(int, 8, rates_n);
109 for (ri = 0; ri < sband->n_bitrates; ri++) {
110 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
111 5 * (1 << shift));
112 u8 basic = 0;
113 if (!(rates & BIT(ri)))
114 continue;
115
116 if (basic_rates & BIT(ri))
117 basic = 0x80;
118 *pos++ = basic | (u8) rate;
119 if (++rates_added == 8) {
120 ri++; /* continue at next rate for EXT_SUPP_RATES */
121 break;
122 }
123 }
124
125 if (sband->band == IEEE80211_BAND_2GHZ) {
126 *pos++ = WLAN_EID_DS_PARAMS;
127 *pos++ = 1;
128 *pos++ = ieee80211_frequency_to_channel(
129 chandef->chan->center_freq);
130 }
131
132 *pos++ = WLAN_EID_IBSS_PARAMS;
133 *pos++ = 2;
134 /* FIX: set ATIM window based on scan results */
135 *pos++ = 0;
136 *pos++ = 0;
137
138 /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
139 if (rates_n > 8) {
140 *pos++ = WLAN_EID_EXT_SUPP_RATES;
141 *pos++ = rates_n - 8;
142 for (; ri < sband->n_bitrates; ri++) {
143 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
144 5 * (1 << shift));
145 u8 basic = 0;
146 if (!(rates & BIT(ri)))
147 continue;
148
149 if (basic_rates & BIT(ri))
150 basic = 0x80;
151 *pos++ = basic | (u8) rate;
152 }
153 }
154
155 if (ifibss->ie_len) {
156 memcpy(pos, ifibss->ie, ifibss->ie_len);
157 pos += ifibss->ie_len;
158 }
159
160 /* add HT capability and information IEs */
161 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
162 chandef->width != NL80211_CHAN_WIDTH_5 &&
163 chandef->width != NL80211_CHAN_WIDTH_10 &&
164 sband->ht_cap.ht_supported) {
165 struct ieee80211_sta_ht_cap ht_cap;
166
167 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
168 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
169
170 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
171 /*
172 * Note: According to 802.11n-2009 9.13.3.1, HT Protection
173 * field and RIFS Mode are reserved in IBSS mode, therefore
174 * keep them at 0
175 */
176 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
177 chandef, 0);
178 }
179
180 if (local->hw.queues >= IEEE80211_NUM_ACS) {
181 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
182 *pos++ = 7; /* len */
183 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
184 *pos++ = 0x50;
185 *pos++ = 0xf2;
186 *pos++ = 2; /* WME */
187 *pos++ = 0; /* WME info */
188 *pos++ = 1; /* WME ver */
189 *pos++ = 0; /* U-APSD no in use */
190 }
191
192 presp->head_len = pos - presp->head;
193 if (WARN_ON(presp->head_len > frame_len))
194 goto error;
195
196 return presp;
197 error:
198 kfree(presp);
199 return NULL;
200 }
201
202 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
203 const u8 *bssid, const int beacon_int,
204 struct cfg80211_chan_def *req_chandef,
205 const u32 basic_rates,
206 const u16 capability, u64 tsf,
207 bool creator)
208 {
209 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
210 struct ieee80211_local *local = sdata->local;
211 struct ieee80211_supported_band *sband;
212 struct ieee80211_mgmt *mgmt;
213 struct cfg80211_bss *bss;
214 u32 bss_change;
215 struct cfg80211_chan_def chandef;
216 struct ieee80211_channel *chan;
217 struct beacon_data *presp;
218 enum nl80211_bss_scan_width scan_width;
219 bool have_higher_than_11mbit;
220
221 sdata_assert_lock(sdata);
222
223 /* Reset own TSF to allow time synchronization work. */
224 drv_reset_tsf(local, sdata);
225
226 if (!ether_addr_equal(ifibss->bssid, bssid))
227 sta_info_flush(sdata);
228
229 /* if merging, indicate to driver that we leave the old IBSS */
230 if (sdata->vif.bss_conf.ibss_joined) {
231 sdata->vif.bss_conf.ibss_joined = false;
232 sdata->vif.bss_conf.ibss_creator = false;
233 sdata->vif.bss_conf.enable_beacon = false;
234 netif_carrier_off(sdata->dev);
235 ieee80211_bss_info_change_notify(sdata,
236 BSS_CHANGED_IBSS |
237 BSS_CHANGED_BEACON_ENABLED);
238 }
239
240 presp = rcu_dereference_protected(ifibss->presp,
241 lockdep_is_held(&sdata->wdev.mtx));
242 rcu_assign_pointer(ifibss->presp, NULL);
243 if (presp)
244 kfree_rcu(presp, rcu_head);
245
246 sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
247
248 /* make a copy of the chandef, it could be modified below. */
249 chandef = *req_chandef;
250 chan = chandef.chan;
251 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) {
252 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
253 chandef.width == NL80211_CHAN_WIDTH_10 ||
254 chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
255 chandef.width == NL80211_CHAN_WIDTH_20) {
256 sdata_info(sdata,
257 "Failed to join IBSS, beacons forbidden\n");
258 return;
259 }
260 chandef.width = NL80211_CHAN_WIDTH_20;
261 chandef.center_freq1 = chan->center_freq;
262 }
263
264 ieee80211_vif_release_channel(sdata);
265 if (ieee80211_vif_use_channel(sdata, &chandef,
266 ifibss->fixed_channel ?
267 IEEE80211_CHANCTX_SHARED :
268 IEEE80211_CHANCTX_EXCLUSIVE)) {
269 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
270 return;
271 }
272
273 memcpy(ifibss->bssid, bssid, ETH_ALEN);
274
275 sband = local->hw.wiphy->bands[chan->band];
276
277 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
278 capability, tsf, &chandef,
279 &have_higher_than_11mbit);
280 if (!presp)
281 return;
282
283 rcu_assign_pointer(ifibss->presp, presp);
284 mgmt = (void *)presp->head;
285
286 sdata->vif.bss_conf.enable_beacon = true;
287 sdata->vif.bss_conf.beacon_int = beacon_int;
288 sdata->vif.bss_conf.basic_rates = basic_rates;
289 sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
290 memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
291 bss_change = BSS_CHANGED_BEACON_INT;
292 bss_change |= ieee80211_reset_erp_info(sdata);
293 bss_change |= BSS_CHANGED_BSSID;
294 bss_change |= BSS_CHANGED_BEACON;
295 bss_change |= BSS_CHANGED_BEACON_ENABLED;
296 bss_change |= BSS_CHANGED_BASIC_RATES;
297 bss_change |= BSS_CHANGED_HT;
298 bss_change |= BSS_CHANGED_IBSS;
299 bss_change |= BSS_CHANGED_SSID;
300
301 /*
302 * In 5 GHz/802.11a, we can always use short slot time.
303 * (IEEE 802.11-2012 18.3.8.7)
304 *
305 * In 2.4GHz, we must always use long slots in IBSS for compatibility
306 * reasons.
307 * (IEEE 802.11-2012 19.4.5)
308 *
309 * HT follows these specifications (IEEE 802.11-2012 20.3.18)
310 */
311 sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ;
312 bss_change |= BSS_CHANGED_ERP_SLOT;
313
314 /* cf. IEEE 802.11 9.2.12 */
315 if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit)
316 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
317 else
318 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
319
320 sdata->vif.bss_conf.ibss_joined = true;
321 sdata->vif.bss_conf.ibss_creator = creator;
322 ieee80211_bss_info_change_notify(sdata, bss_change);
323
324 ieee80211_set_wmm_default(sdata, true);
325
326 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
327 mod_timer(&ifibss->timer,
328 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
329
330 scan_width = cfg80211_chandef_to_scan_width(&chandef);
331 bss = cfg80211_inform_bss_width_frame(local->hw.wiphy, chan,
332 scan_width, mgmt,
333 presp->head_len, 0, GFP_KERNEL);
334 cfg80211_put_bss(local->hw.wiphy, bss);
335 netif_carrier_on(sdata->dev);
336 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
337 }
338
339 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
340 struct ieee80211_bss *bss)
341 {
342 struct cfg80211_bss *cbss =
343 container_of((void *)bss, struct cfg80211_bss, priv);
344 struct ieee80211_supported_band *sband;
345 struct cfg80211_chan_def chandef;
346 u32 basic_rates;
347 int i, j;
348 u16 beacon_int = cbss->beacon_interval;
349 const struct cfg80211_bss_ies *ies;
350 enum nl80211_channel_type chan_type;
351 u64 tsf;
352 u32 rate_flags;
353 int shift;
354
355 sdata_assert_lock(sdata);
356
357 if (beacon_int < 10)
358 beacon_int = 10;
359
360 switch (sdata->u.ibss.chandef.width) {
361 case NL80211_CHAN_WIDTH_20_NOHT:
362 case NL80211_CHAN_WIDTH_20:
363 case NL80211_CHAN_WIDTH_40:
364 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
365 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
366 break;
367 case NL80211_CHAN_WIDTH_5:
368 case NL80211_CHAN_WIDTH_10:
369 cfg80211_chandef_create(&chandef, cbss->channel,
370 NL80211_CHAN_WIDTH_20_NOHT);
371 chandef.width = sdata->u.ibss.chandef.width;
372 break;
373 default:
374 /* fall back to 20 MHz for unsupported modes */
375 cfg80211_chandef_create(&chandef, cbss->channel,
376 NL80211_CHAN_WIDTH_20_NOHT);
377 break;
378 }
379
380 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
381 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
382 shift = ieee80211_vif_get_shift(&sdata->vif);
383
384 basic_rates = 0;
385
386 for (i = 0; i < bss->supp_rates_len; i++) {
387 int rate = bss->supp_rates[i] & 0x7f;
388 bool is_basic = !!(bss->supp_rates[i] & 0x80);
389
390 for (j = 0; j < sband->n_bitrates; j++) {
391 int brate;
392 if ((rate_flags & sband->bitrates[j].flags)
393 != rate_flags)
394 continue;
395
396 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
397 5 * (1 << shift));
398 if (brate == rate) {
399 if (is_basic)
400 basic_rates |= BIT(j);
401 break;
402 }
403 }
404 }
405
406 rcu_read_lock();
407 ies = rcu_dereference(cbss->ies);
408 tsf = ies->tsf;
409 rcu_read_unlock();
410
411 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
412 beacon_int,
413 &chandef,
414 basic_rates,
415 cbss->capability,
416 tsf, false);
417 }
418
419 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
420 __acquires(RCU)
421 {
422 struct ieee80211_sub_if_data *sdata = sta->sdata;
423 u8 addr[ETH_ALEN];
424
425 memcpy(addr, sta->sta.addr, ETH_ALEN);
426
427 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
428
429 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
430 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
431 /* authorize the station only if the network is not RSN protected. If
432 * not wait for the userspace to authorize it */
433 if (!sta->sdata->u.ibss.control_port)
434 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
435
436 rate_control_rate_init(sta);
437
438 /* If it fails, maybe we raced another insertion? */
439 if (sta_info_insert_rcu(sta))
440 return sta_info_get(sdata, addr);
441 return sta;
442 }
443
444 static struct sta_info *
445 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
446 const u8 *addr, u32 supp_rates)
447 __acquires(RCU)
448 {
449 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
450 struct ieee80211_local *local = sdata->local;
451 struct sta_info *sta;
452 struct ieee80211_chanctx_conf *chanctx_conf;
453 struct ieee80211_supported_band *sband;
454 enum nl80211_bss_scan_width scan_width;
455 int band;
456
457 /*
458 * XXX: Consider removing the least recently used entry and
459 * allow new one to be added.
460 */
461 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
462 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
463 sdata->name, addr);
464 rcu_read_lock();
465 return NULL;
466 }
467
468 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
469 rcu_read_lock();
470 return NULL;
471 }
472
473 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
474 rcu_read_lock();
475 return NULL;
476 }
477
478 rcu_read_lock();
479 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
480 if (WARN_ON_ONCE(!chanctx_conf))
481 return NULL;
482 band = chanctx_conf->def.chan->band;
483 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
484 rcu_read_unlock();
485
486 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
487 if (!sta) {
488 rcu_read_lock();
489 return NULL;
490 }
491
492 sta->last_rx = jiffies;
493
494 /* make sure mandatory rates are always added */
495 sband = local->hw.wiphy->bands[band];
496 sta->sta.supp_rates[band] = supp_rates |
497 ieee80211_mandatory_rates(sband, scan_width);
498
499 return ieee80211_ibss_finish_sta(sta);
500 }
501
502 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
503 struct ieee80211_mgmt *mgmt,
504 size_t len)
505 {
506 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
507
508 if (len < IEEE80211_DEAUTH_FRAME_LEN)
509 return;
510
511 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
512 mgmt->sa, mgmt->da, mgmt->bssid, reason);
513 sta_info_destroy_addr(sdata, mgmt->sa);
514 }
515
516 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
517 struct ieee80211_mgmt *mgmt,
518 size_t len)
519 {
520 u16 auth_alg, auth_transaction;
521
522 sdata_assert_lock(sdata);
523
524 if (len < 24 + 6)
525 return;
526
527 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
528 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
529
530 ibss_dbg(sdata,
531 "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
532 mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
533
534 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
535 return;
536
537 /*
538 * IEEE 802.11 standard does not require authentication in IBSS
539 * networks and most implementations do not seem to use it.
540 * However, try to reply to authentication attempts if someone
541 * has actually implemented this.
542 */
543 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
544 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
545 }
546
547 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
548 struct ieee80211_mgmt *mgmt, size_t len,
549 struct ieee80211_rx_status *rx_status,
550 struct ieee802_11_elems *elems)
551 {
552 struct ieee80211_local *local = sdata->local;
553 int freq;
554 struct cfg80211_bss *cbss;
555 struct ieee80211_bss *bss;
556 struct sta_info *sta;
557 struct ieee80211_channel *channel;
558 u64 beacon_timestamp, rx_timestamp;
559 u32 supp_rates = 0;
560 enum ieee80211_band band = rx_status->band;
561 enum nl80211_bss_scan_width scan_width;
562 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
563 bool rates_updated = false;
564
565 if (elems->ds_params)
566 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
567 band);
568 else
569 freq = rx_status->freq;
570
571 channel = ieee80211_get_channel(local->hw.wiphy, freq);
572
573 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
574 return;
575
576 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
577 ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) {
578
579 rcu_read_lock();
580 sta = sta_info_get(sdata, mgmt->sa);
581
582 if (elems->supp_rates) {
583 supp_rates = ieee80211_sta_get_rates(sdata, elems,
584 band, NULL);
585 if (sta) {
586 u32 prev_rates;
587
588 prev_rates = sta->sta.supp_rates[band];
589 /* make sure mandatory rates are always added */
590 scan_width = NL80211_BSS_CHAN_WIDTH_20;
591 if (rx_status->flag & RX_FLAG_5MHZ)
592 scan_width = NL80211_BSS_CHAN_WIDTH_5;
593 if (rx_status->flag & RX_FLAG_10MHZ)
594 scan_width = NL80211_BSS_CHAN_WIDTH_10;
595
596 sta->sta.supp_rates[band] = supp_rates |
597 ieee80211_mandatory_rates(sband,
598 scan_width);
599 if (sta->sta.supp_rates[band] != prev_rates) {
600 ibss_dbg(sdata,
601 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
602 sta->sta.addr, prev_rates,
603 sta->sta.supp_rates[band]);
604 rates_updated = true;
605 }
606 } else {
607 rcu_read_unlock();
608 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
609 mgmt->sa, supp_rates);
610 }
611 }
612
613 if (sta && elems->wmm_info)
614 set_sta_flag(sta, WLAN_STA_WME);
615
616 if (sta && elems->ht_operation && elems->ht_cap_elem &&
617 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
618 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
619 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
620 /* we both use HT */
621 struct ieee80211_ht_cap htcap_ie;
622 struct cfg80211_chan_def chandef;
623
624 ieee80211_ht_oper_to_chandef(channel,
625 elems->ht_operation,
626 &chandef);
627
628 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
629
630 /*
631 * fall back to HT20 if we don't use or use
632 * the other extension channel
633 */
634 if (chandef.center_freq1 !=
635 sdata->u.ibss.chandef.center_freq1)
636 htcap_ie.cap_info &=
637 cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40);
638
639 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(
640 sdata, sband, &htcap_ie, sta);
641 }
642
643 if (sta && rates_updated) {
644 drv_sta_rc_update(local, sdata, &sta->sta,
645 IEEE80211_RC_SUPP_RATES_CHANGED);
646 rate_control_rate_init(sta);
647 }
648
649 rcu_read_unlock();
650 }
651
652 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
653 channel);
654 if (!bss)
655 return;
656
657 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
658
659 /* same for beacon and probe response */
660 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
661
662 /* check if we need to merge IBSS */
663
664 /* we use a fixed BSSID */
665 if (sdata->u.ibss.fixed_bssid)
666 goto put_bss;
667
668 /* not an IBSS */
669 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
670 goto put_bss;
671
672 /* different channel */
673 if (sdata->u.ibss.fixed_channel &&
674 sdata->u.ibss.chandef.chan != cbss->channel)
675 goto put_bss;
676
677 /* different SSID */
678 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
679 memcmp(elems->ssid, sdata->u.ibss.ssid,
680 sdata->u.ibss.ssid_len))
681 goto put_bss;
682
683 /* same BSSID */
684 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
685 goto put_bss;
686
687 if (ieee80211_have_rx_timestamp(rx_status)) {
688 /* time when timestamp field was received */
689 rx_timestamp =
690 ieee80211_calculate_rx_timestamp(local, rx_status,
691 len + FCS_LEN, 24);
692 } else {
693 /*
694 * second best option: get current TSF
695 * (will return -1 if not supported)
696 */
697 rx_timestamp = drv_get_tsf(local, sdata);
698 }
699
700 ibss_dbg(sdata,
701 "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
702 mgmt->sa, mgmt->bssid,
703 (unsigned long long)rx_timestamp,
704 (unsigned long long)beacon_timestamp,
705 (unsigned long long)(rx_timestamp - beacon_timestamp),
706 jiffies);
707
708 if (beacon_timestamp > rx_timestamp) {
709 ibss_dbg(sdata,
710 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
711 mgmt->bssid);
712 ieee80211_sta_join_ibss(sdata, bss);
713 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
714 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
715 supp_rates);
716 rcu_read_unlock();
717 }
718
719 put_bss:
720 ieee80211_rx_bss_put(local, bss);
721 }
722
723 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
724 const u8 *bssid, const u8 *addr,
725 u32 supp_rates)
726 {
727 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
728 struct ieee80211_local *local = sdata->local;
729 struct sta_info *sta;
730 struct ieee80211_chanctx_conf *chanctx_conf;
731 struct ieee80211_supported_band *sband;
732 enum nl80211_bss_scan_width scan_width;
733 int band;
734
735 /*
736 * XXX: Consider removing the least recently used entry and
737 * allow new one to be added.
738 */
739 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
740 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
741 sdata->name, addr);
742 return;
743 }
744
745 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
746 return;
747
748 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
749 return;
750
751 rcu_read_lock();
752 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
753 if (WARN_ON_ONCE(!chanctx_conf)) {
754 rcu_read_unlock();
755 return;
756 }
757 band = chanctx_conf->def.chan->band;
758 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
759 rcu_read_unlock();
760
761 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
762 if (!sta)
763 return;
764
765 sta->last_rx = jiffies;
766
767 /* make sure mandatory rates are always added */
768 sband = local->hw.wiphy->bands[band];
769 sta->sta.supp_rates[band] = supp_rates |
770 ieee80211_mandatory_rates(sband, scan_width);
771
772 spin_lock(&ifibss->incomplete_lock);
773 list_add(&sta->list, &ifibss->incomplete_stations);
774 spin_unlock(&ifibss->incomplete_lock);
775 ieee80211_queue_work(&local->hw, &sdata->work);
776 }
777
778 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
779 {
780 struct ieee80211_local *local = sdata->local;
781 int active = 0;
782 struct sta_info *sta;
783
784 sdata_assert_lock(sdata);
785
786 rcu_read_lock();
787
788 list_for_each_entry_rcu(sta, &local->sta_list, list) {
789 if (sta->sdata == sdata &&
790 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
791 jiffies)) {
792 active++;
793 break;
794 }
795 }
796
797 rcu_read_unlock();
798
799 return active;
800 }
801
802 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
803 {
804 struct ieee80211_local *local = sdata->local;
805 struct sta_info *sta, *tmp;
806 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
807 unsigned long exp_rsn_time = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
808
809 mutex_lock(&local->sta_mtx);
810
811 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
812 if (sdata != sta->sdata)
813 continue;
814
815 if (time_after(jiffies, sta->last_rx + exp_time) ||
816 (time_after(jiffies, sta->last_rx + exp_rsn_time) &&
817 sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
818 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
819 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
820 "not authorized " : "", sta->sta.addr);
821
822 WARN_ON(__sta_info_destroy(sta));
823 }
824 }
825
826 mutex_unlock(&local->sta_mtx);
827 }
828
829 /*
830 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
831 */
832
833 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
834 {
835 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
836 enum nl80211_bss_scan_width scan_width;
837
838 sdata_assert_lock(sdata);
839
840 mod_timer(&ifibss->timer,
841 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
842
843 ieee80211_ibss_sta_expire(sdata);
844
845 if (time_before(jiffies, ifibss->last_scan_completed +
846 IEEE80211_IBSS_MERGE_INTERVAL))
847 return;
848
849 if (ieee80211_sta_active_ibss(sdata))
850 return;
851
852 if (ifibss->fixed_channel)
853 return;
854
855 sdata_info(sdata,
856 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
857
858 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
859 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
860 NULL, scan_width);
861 }
862
863 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
864 {
865 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
866 u8 bssid[ETH_ALEN];
867 u16 capability;
868 int i;
869
870 sdata_assert_lock(sdata);
871
872 if (ifibss->fixed_bssid) {
873 memcpy(bssid, ifibss->bssid, ETH_ALEN);
874 } else {
875 /* Generate random, not broadcast, locally administered BSSID. Mix in
876 * own MAC address to make sure that devices that do not have proper
877 * random number generator get different BSSID. */
878 get_random_bytes(bssid, ETH_ALEN);
879 for (i = 0; i < ETH_ALEN; i++)
880 bssid[i] ^= sdata->vif.addr[i];
881 bssid[0] &= ~0x01;
882 bssid[0] |= 0x02;
883 }
884
885 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
886
887 capability = WLAN_CAPABILITY_IBSS;
888
889 if (ifibss->privacy)
890 capability |= WLAN_CAPABILITY_PRIVACY;
891 else
892 sdata->drop_unencrypted = 0;
893
894 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
895 &ifibss->chandef, ifibss->basic_rates,
896 capability, 0, true);
897 }
898
899 /*
900 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
901 */
902
903 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
904 {
905 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
906 struct ieee80211_local *local = sdata->local;
907 struct cfg80211_bss *cbss;
908 struct ieee80211_channel *chan = NULL;
909 const u8 *bssid = NULL;
910 enum nl80211_bss_scan_width scan_width;
911 int active_ibss;
912 u16 capability;
913
914 sdata_assert_lock(sdata);
915
916 active_ibss = ieee80211_sta_active_ibss(sdata);
917 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
918
919 if (active_ibss)
920 return;
921
922 capability = WLAN_CAPABILITY_IBSS;
923 if (ifibss->privacy)
924 capability |= WLAN_CAPABILITY_PRIVACY;
925 if (ifibss->fixed_bssid)
926 bssid = ifibss->bssid;
927 if (ifibss->fixed_channel)
928 chan = ifibss->chandef.chan;
929 if (!is_zero_ether_addr(ifibss->bssid))
930 bssid = ifibss->bssid;
931 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
932 ifibss->ssid, ifibss->ssid_len,
933 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
934 capability);
935
936 if (cbss) {
937 struct ieee80211_bss *bss;
938
939 bss = (void *)cbss->priv;
940 ibss_dbg(sdata,
941 "sta_find_ibss: selected %pM current %pM\n",
942 cbss->bssid, ifibss->bssid);
943 sdata_info(sdata,
944 "Selected IBSS BSSID %pM based on configured SSID\n",
945 cbss->bssid);
946
947 ieee80211_sta_join_ibss(sdata, bss);
948 ieee80211_rx_bss_put(local, bss);
949 return;
950 }
951
952 /* if a fixed bssid and a fixed freq have been provided create the IBSS
953 * directly and do not waste time scanning
954 */
955 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
956 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
957 bssid);
958 ieee80211_sta_create_ibss(sdata);
959 return;
960 }
961
962
963 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
964
965 /* Selected IBSS not found in current scan results - try to scan */
966 if (time_after(jiffies, ifibss->last_scan_completed +
967 IEEE80211_SCAN_INTERVAL)) {
968 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
969
970 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
971 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
972 ifibss->ssid_len, chan,
973 scan_width);
974 } else {
975 int interval = IEEE80211_SCAN_INTERVAL;
976
977 if (time_after(jiffies, ifibss->ibss_join_req +
978 IEEE80211_IBSS_JOIN_TIMEOUT))
979 ieee80211_sta_create_ibss(sdata);
980
981 mod_timer(&ifibss->timer,
982 round_jiffies(jiffies + interval));
983 }
984 }
985
986 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
987 struct sk_buff *req)
988 {
989 struct ieee80211_mgmt *mgmt = (void *)req->data;
990 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
991 struct ieee80211_local *local = sdata->local;
992 int tx_last_beacon, len = req->len;
993 struct sk_buff *skb;
994 struct beacon_data *presp;
995 u8 *pos, *end;
996
997 sdata_assert_lock(sdata);
998
999 presp = rcu_dereference_protected(ifibss->presp,
1000 lockdep_is_held(&sdata->wdev.mtx));
1001
1002 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1003 len < 24 + 2 || !presp)
1004 return;
1005
1006 tx_last_beacon = drv_tx_last_beacon(local);
1007
1008 ibss_dbg(sdata,
1009 "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
1010 mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
1011
1012 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1013 return;
1014
1015 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1016 !is_broadcast_ether_addr(mgmt->bssid))
1017 return;
1018
1019 end = ((u8 *) mgmt) + len;
1020 pos = mgmt->u.probe_req.variable;
1021 if (pos[0] != WLAN_EID_SSID ||
1022 pos + 2 + pos[1] > end) {
1023 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1024 mgmt->sa);
1025 return;
1026 }
1027 if (pos[1] != 0 &&
1028 (pos[1] != ifibss->ssid_len ||
1029 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1030 /* Ignore ProbeReq for foreign SSID */
1031 return;
1032 }
1033
1034 /* Reply with ProbeResp */
1035 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1036 if (!skb)
1037 return;
1038
1039 skb_reserve(skb, local->tx_headroom);
1040 memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
1041
1042 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1043 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1044 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1045 ieee80211_tx_skb(sdata, skb);
1046 }
1047
1048 static
1049 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1050 struct ieee80211_mgmt *mgmt, size_t len,
1051 struct ieee80211_rx_status *rx_status)
1052 {
1053 size_t baselen;
1054 struct ieee802_11_elems elems;
1055
1056 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1057 offsetof(typeof(mgmt->u.beacon), variable));
1058
1059 /*
1060 * either beacon or probe_resp but the variable field is at the
1061 * same offset
1062 */
1063 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1064 if (baselen > len)
1065 return;
1066
1067 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1068 false, &elems);
1069
1070 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1071 }
1072
1073 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1074 struct sk_buff *skb)
1075 {
1076 struct ieee80211_rx_status *rx_status;
1077 struct ieee80211_mgmt *mgmt;
1078 u16 fc;
1079
1080 rx_status = IEEE80211_SKB_RXCB(skb);
1081 mgmt = (struct ieee80211_mgmt *) skb->data;
1082 fc = le16_to_cpu(mgmt->frame_control);
1083
1084 sdata_lock(sdata);
1085
1086 if (!sdata->u.ibss.ssid_len)
1087 goto mgmt_out; /* not ready to merge yet */
1088
1089 switch (fc & IEEE80211_FCTL_STYPE) {
1090 case IEEE80211_STYPE_PROBE_REQ:
1091 ieee80211_rx_mgmt_probe_req(sdata, skb);
1092 break;
1093 case IEEE80211_STYPE_PROBE_RESP:
1094 case IEEE80211_STYPE_BEACON:
1095 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1096 rx_status);
1097 break;
1098 case IEEE80211_STYPE_AUTH:
1099 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1100 break;
1101 case IEEE80211_STYPE_DEAUTH:
1102 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1103 break;
1104 }
1105
1106 mgmt_out:
1107 sdata_unlock(sdata);
1108 }
1109
1110 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1111 {
1112 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1113 struct sta_info *sta;
1114
1115 sdata_lock(sdata);
1116
1117 /*
1118 * Work could be scheduled after scan or similar
1119 * when we aren't even joined (or trying) with a
1120 * network.
1121 */
1122 if (!ifibss->ssid_len)
1123 goto out;
1124
1125 spin_lock_bh(&ifibss->incomplete_lock);
1126 while (!list_empty(&ifibss->incomplete_stations)) {
1127 sta = list_first_entry(&ifibss->incomplete_stations,
1128 struct sta_info, list);
1129 list_del(&sta->list);
1130 spin_unlock_bh(&ifibss->incomplete_lock);
1131
1132 ieee80211_ibss_finish_sta(sta);
1133 rcu_read_unlock();
1134 spin_lock_bh(&ifibss->incomplete_lock);
1135 }
1136 spin_unlock_bh(&ifibss->incomplete_lock);
1137
1138 switch (ifibss->state) {
1139 case IEEE80211_IBSS_MLME_SEARCH:
1140 ieee80211_sta_find_ibss(sdata);
1141 break;
1142 case IEEE80211_IBSS_MLME_JOINED:
1143 ieee80211_sta_merge_ibss(sdata);
1144 break;
1145 default:
1146 WARN_ON(1);
1147 break;
1148 }
1149
1150 out:
1151 sdata_unlock(sdata);
1152 }
1153
1154 static void ieee80211_ibss_timer(unsigned long data)
1155 {
1156 struct ieee80211_sub_if_data *sdata =
1157 (struct ieee80211_sub_if_data *) data;
1158
1159 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1160 }
1161
1162 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1163 {
1164 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1165
1166 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1167 (unsigned long) sdata);
1168 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1169 spin_lock_init(&ifibss->incomplete_lock);
1170 }
1171
1172 /* scan finished notification */
1173 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1174 {
1175 struct ieee80211_sub_if_data *sdata;
1176
1177 mutex_lock(&local->iflist_mtx);
1178 list_for_each_entry(sdata, &local->interfaces, list) {
1179 if (!ieee80211_sdata_running(sdata))
1180 continue;
1181 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1182 continue;
1183 sdata->u.ibss.last_scan_completed = jiffies;
1184 ieee80211_queue_work(&local->hw, &sdata->work);
1185 }
1186 mutex_unlock(&local->iflist_mtx);
1187 }
1188
1189 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1190 struct cfg80211_ibss_params *params)
1191 {
1192 u32 changed = 0;
1193 u32 rate_flags;
1194 struct ieee80211_supported_band *sband;
1195 int i;
1196
1197 if (params->bssid) {
1198 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1199 sdata->u.ibss.fixed_bssid = true;
1200 } else
1201 sdata->u.ibss.fixed_bssid = false;
1202
1203 sdata->u.ibss.privacy = params->privacy;
1204 sdata->u.ibss.control_port = params->control_port;
1205 sdata->u.ibss.basic_rates = params->basic_rates;
1206
1207 /* fix basic_rates if channel does not support these rates */
1208 rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
1209 sband = sdata->local->hw.wiphy->bands[params->chandef.chan->band];
1210 for (i = 0; i < sband->n_bitrates; i++) {
1211 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1212 sdata->u.ibss.basic_rates &= ~BIT(i);
1213 }
1214 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1215 sizeof(params->mcast_rate));
1216
1217 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1218
1219 sdata->u.ibss.chandef = params->chandef;
1220 sdata->u.ibss.fixed_channel = params->channel_fixed;
1221
1222 if (params->ie) {
1223 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1224 GFP_KERNEL);
1225 if (sdata->u.ibss.ie)
1226 sdata->u.ibss.ie_len = params->ie_len;
1227 }
1228
1229 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1230 sdata->u.ibss.ibss_join_req = jiffies;
1231
1232 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1233 sdata->u.ibss.ssid_len = params->ssid_len;
1234
1235 memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1236 sizeof(sdata->u.ibss.ht_capa));
1237 memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1238 sizeof(sdata->u.ibss.ht_capa_mask));
1239
1240 /*
1241 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1242 * reserved, but an HT STA shall protect HT transmissions as though
1243 * the HT Protection field were set to non-HT mixed mode.
1244 *
1245 * In an IBSS, the RIFS Mode field of the HT Operation element is
1246 * also reserved, but an HT STA shall operate as though this field
1247 * were set to 1.
1248 */
1249
1250 sdata->vif.bss_conf.ht_operation_mode |=
1251 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1252 | IEEE80211_HT_PARAM_RIFS_MODE;
1253
1254 changed |= BSS_CHANGED_HT;
1255 ieee80211_bss_info_change_notify(sdata, changed);
1256
1257 sdata->smps_mode = IEEE80211_SMPS_OFF;
1258 sdata->needed_rx_chains = sdata->local->rx_chains;
1259
1260 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1261
1262 return 0;
1263 }
1264
1265 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1266 {
1267 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1268 struct ieee80211_local *local = sdata->local;
1269 struct cfg80211_bss *cbss;
1270 u16 capability;
1271 int active_ibss;
1272 struct sta_info *sta;
1273 struct beacon_data *presp;
1274
1275 active_ibss = ieee80211_sta_active_ibss(sdata);
1276
1277 if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) {
1278 capability = WLAN_CAPABILITY_IBSS;
1279
1280 if (ifibss->privacy)
1281 capability |= WLAN_CAPABILITY_PRIVACY;
1282
1283 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
1284 ifibss->bssid, ifibss->ssid,
1285 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
1286 WLAN_CAPABILITY_PRIVACY,
1287 capability);
1288
1289 if (cbss) {
1290 cfg80211_unlink_bss(local->hw.wiphy, cbss);
1291 cfg80211_put_bss(local->hw.wiphy, cbss);
1292 }
1293 }
1294
1295 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
1296 memset(ifibss->bssid, 0, ETH_ALEN);
1297 ifibss->ssid_len = 0;
1298
1299 sta_info_flush(sdata);
1300
1301 spin_lock_bh(&ifibss->incomplete_lock);
1302 while (!list_empty(&ifibss->incomplete_stations)) {
1303 sta = list_first_entry(&ifibss->incomplete_stations,
1304 struct sta_info, list);
1305 list_del(&sta->list);
1306 spin_unlock_bh(&ifibss->incomplete_lock);
1307
1308 sta_info_free(local, sta);
1309 spin_lock_bh(&ifibss->incomplete_lock);
1310 }
1311 spin_unlock_bh(&ifibss->incomplete_lock);
1312
1313 netif_carrier_off(sdata->dev);
1314
1315 /* remove beacon */
1316 kfree(sdata->u.ibss.ie);
1317 presp = rcu_dereference_protected(ifibss->presp,
1318 lockdep_is_held(&sdata->wdev.mtx));
1319 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
1320
1321 /* on the next join, re-program HT parameters */
1322 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1323 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1324
1325 sdata->vif.bss_conf.ibss_joined = false;
1326 sdata->vif.bss_conf.ibss_creator = false;
1327 sdata->vif.bss_conf.enable_beacon = false;
1328 sdata->vif.bss_conf.ssid_len = 0;
1329 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
1330 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
1331 BSS_CHANGED_IBSS);
1332 ieee80211_vif_release_channel(sdata);
1333 synchronize_rcu();
1334 kfree(presp);
1335
1336 skb_queue_purge(&sdata->skb_queue);
1337
1338 del_timer_sync(&sdata->u.ibss.timer);
1339
1340 return 0;
1341 }
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