1 // SPDX-License-Identifier: GPL-2.0-only
3 * IBSS mode implementation
4 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
5 * Copyright 2004, Instant802 Networks, Inc.
6 * Copyright 2005, Devicescape Software, Inc.
7 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
8 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
9 * Copyright 2009, Johannes Berg <johannes@sipsolutions.net>
10 * Copyright 2013-2014 Intel Mobile Communications GmbH
11 * Copyright(c) 2016 Intel Deutschland GmbH
12 * Copyright(c) 2018-2021 Intel Corporation
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>
24 #include "ieee80211_i.h"
25 #include "driver-ops.h"
28 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
29 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
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)
35 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
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)
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;
50 struct ieee80211_supported_band *sband;
51 u32 rate_flags, rates = 0, rates_added = 0;
52 struct beacon_data *presp;
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 */ +
63 5 /* Channel Switch Announcement */ +
64 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
65 2 + sizeof(struct ieee80211_ht_cap) +
66 2 + sizeof(struct ieee80211_ht_operation) +
67 2 + sizeof(struct ieee80211_vht_cap) +
68 2 + sizeof(struct ieee80211_vht_operation) +
70 presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
74 presp->head = (void *)(presp + 1);
76 mgmt = (void *) presp->head;
77 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
78 IEEE80211_STYPE_PROBE_RESP);
79 eth_broadcast_addr(mgmt->da);
80 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
81 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
82 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
83 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
84 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
86 pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
88 *pos++ = WLAN_EID_SSID;
89 *pos++ = ifibss->ssid_len;
90 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
91 pos += ifibss->ssid_len;
93 sband = local->hw.wiphy->bands[chandef->chan->band];
94 rate_flags = ieee80211_chandef_rate_flags(chandef);
95 shift = ieee80211_chandef_get_shift(chandef);
97 if (have_higher_than_11mbit)
98 *have_higher_than_11mbit = false;
100 for (i = 0; i < sband->n_bitrates; i++) {
101 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
103 if (sband->bitrates[i].bitrate > 110 &&
104 have_higher_than_11mbit)
105 *have_higher_than_11mbit = true;
111 *pos++ = WLAN_EID_SUPP_RATES;
112 *pos++ = min_t(int, 8, rates_n);
113 for (ri = 0; ri < sband->n_bitrates; ri++) {
114 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
117 if (!(rates & BIT(ri)))
120 if (basic_rates & BIT(ri))
122 *pos++ = basic | (u8) rate;
123 if (++rates_added == 8) {
124 ri++; /* continue at next rate for EXT_SUPP_RATES */
129 if (sband->band == NL80211_BAND_2GHZ) {
130 *pos++ = WLAN_EID_DS_PARAMS;
132 *pos++ = ieee80211_frequency_to_channel(
133 chandef->chan->center_freq);
136 *pos++ = WLAN_EID_IBSS_PARAMS;
138 /* FIX: set ATIM window based on scan results */
143 *pos++ = WLAN_EID_CHANNEL_SWITCH;
145 *pos++ = csa_settings->block_tx ? 1 : 0;
146 *pos++ = ieee80211_frequency_to_channel(
147 csa_settings->chandef.chan->center_freq);
148 presp->cntdwn_counter_offsets[0] = (pos - presp->head);
149 *pos++ = csa_settings->count;
150 presp->cntdwn_current_counter = csa_settings->count;
153 /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
155 *pos++ = WLAN_EID_EXT_SUPP_RATES;
156 *pos++ = rates_n - 8;
157 for (; ri < sband->n_bitrates; ri++) {
158 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
161 if (!(rates & BIT(ri)))
164 if (basic_rates & BIT(ri))
166 *pos++ = basic | (u8) rate;
170 if (ifibss->ie_len) {
171 memcpy(pos, ifibss->ie, ifibss->ie_len);
172 pos += ifibss->ie_len;
175 /* add HT capability and information IEs */
176 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
177 chandef->width != NL80211_CHAN_WIDTH_5 &&
178 chandef->width != NL80211_CHAN_WIDTH_10 &&
179 sband->ht_cap.ht_supported) {
180 struct ieee80211_sta_ht_cap ht_cap;
182 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
183 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
185 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
187 * Note: According to 802.11n-2009 9.13.3.1, HT Protection
188 * field and RIFS Mode are reserved in IBSS mode, therefore
191 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
194 /* add VHT capability and information IEs */
195 if (chandef->width != NL80211_CHAN_WIDTH_20 &&
196 chandef->width != NL80211_CHAN_WIDTH_40 &&
197 sband->vht_cap.vht_supported) {
198 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
200 pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap,
205 if (local->hw.queues >= IEEE80211_NUM_ACS)
206 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */
208 presp->head_len = pos - presp->head;
209 if (WARN_ON(presp->head_len > frame_len))
218 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
219 const u8 *bssid, const int beacon_int,
220 struct cfg80211_chan_def *req_chandef,
221 const u32 basic_rates,
222 const u16 capability, u64 tsf,
225 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
226 struct ieee80211_local *local = sdata->local;
227 struct ieee80211_mgmt *mgmt;
228 struct cfg80211_bss *bss;
230 struct cfg80211_chan_def chandef;
231 struct ieee80211_channel *chan;
232 struct beacon_data *presp;
233 struct cfg80211_inform_bss bss_meta = {};
234 bool have_higher_than_11mbit;
238 sdata_assert_lock(sdata);
240 /* Reset own TSF to allow time synchronization work. */
241 drv_reset_tsf(local, sdata);
243 if (!ether_addr_equal(ifibss->bssid, bssid))
244 sta_info_flush(sdata);
246 /* if merging, indicate to driver that we leave the old IBSS */
247 if (sdata->vif.bss_conf.ibss_joined) {
248 sdata->vif.bss_conf.ibss_joined = false;
249 sdata->vif.bss_conf.ibss_creator = false;
250 sdata->vif.bss_conf.enable_beacon = false;
251 netif_carrier_off(sdata->dev);
252 ieee80211_bss_info_change_notify(sdata,
254 BSS_CHANGED_BEACON_ENABLED);
255 drv_leave_ibss(local, sdata);
258 presp = rcu_dereference_protected(ifibss->presp,
259 lockdep_is_held(&sdata->wdev.mtx));
260 RCU_INIT_POINTER(ifibss->presp, NULL);
262 kfree_rcu(presp, rcu_head);
264 /* make a copy of the chandef, it could be modified below. */
265 chandef = *req_chandef;
267 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
268 NL80211_IFTYPE_ADHOC)) {
269 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
270 chandef.width == NL80211_CHAN_WIDTH_10 ||
271 chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
272 chandef.width == NL80211_CHAN_WIDTH_20) {
274 "Failed to join IBSS, beacons forbidden\n");
277 chandef.width = NL80211_CHAN_WIDTH_20;
278 chandef.center_freq1 = chan->center_freq;
279 /* check again for downgraded chandef */
280 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
281 NL80211_IFTYPE_ADHOC)) {
283 "Failed to join IBSS, beacons forbidden\n");
288 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
289 &chandef, NL80211_IFTYPE_ADHOC);
292 "Failed to join IBSS, invalid chandef\n");
295 if (err > 0 && !ifibss->userspace_handles_dfs) {
297 "Failed to join IBSS, DFS channel without control program\n");
301 radar_required = err;
303 mutex_lock(&local->mtx);
304 if (ieee80211_vif_use_channel(sdata, &chandef,
305 ifibss->fixed_channel ?
306 IEEE80211_CHANCTX_SHARED :
307 IEEE80211_CHANCTX_EXCLUSIVE)) {
308 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
309 mutex_unlock(&local->mtx);
312 sdata->radar_required = radar_required;
313 mutex_unlock(&local->mtx);
315 memcpy(ifibss->bssid, bssid, ETH_ALEN);
317 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
318 capability, tsf, &chandef,
319 &have_higher_than_11mbit, NULL);
323 rcu_assign_pointer(ifibss->presp, presp);
324 mgmt = (void *)presp->head;
326 sdata->vif.bss_conf.enable_beacon = true;
327 sdata->vif.bss_conf.beacon_int = beacon_int;
328 sdata->vif.bss_conf.basic_rates = basic_rates;
329 sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
330 memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
331 bss_change = BSS_CHANGED_BEACON_INT;
332 bss_change |= ieee80211_reset_erp_info(sdata);
333 bss_change |= BSS_CHANGED_BSSID;
334 bss_change |= BSS_CHANGED_BEACON;
335 bss_change |= BSS_CHANGED_BEACON_ENABLED;
336 bss_change |= BSS_CHANGED_BASIC_RATES;
337 bss_change |= BSS_CHANGED_HT;
338 bss_change |= BSS_CHANGED_IBSS;
339 bss_change |= BSS_CHANGED_SSID;
342 * In 5 GHz/802.11a, we can always use short slot time.
343 * (IEEE 802.11-2012 18.3.8.7)
345 * In 2.4GHz, we must always use long slots in IBSS for compatibility
347 * (IEEE 802.11-2012 19.4.5)
349 * HT follows these specifications (IEEE 802.11-2012 20.3.18)
351 sdata->vif.bss_conf.use_short_slot = chan->band == NL80211_BAND_5GHZ;
352 bss_change |= BSS_CHANGED_ERP_SLOT;
354 /* cf. IEEE 802.11 9.2.12 */
355 if (chan->band == NL80211_BAND_2GHZ && have_higher_than_11mbit)
356 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
358 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
360 ieee80211_set_wmm_default(sdata, true, false);
362 sdata->vif.bss_conf.ibss_joined = true;
363 sdata->vif.bss_conf.ibss_creator = creator;
365 err = drv_join_ibss(local, sdata);
367 sdata->vif.bss_conf.ibss_joined = false;
368 sdata->vif.bss_conf.ibss_creator = false;
369 sdata->vif.bss_conf.enable_beacon = false;
370 sdata->vif.bss_conf.ssid_len = 0;
371 RCU_INIT_POINTER(ifibss->presp, NULL);
372 kfree_rcu(presp, rcu_head);
373 mutex_lock(&local->mtx);
374 ieee80211_vif_release_channel(sdata);
375 mutex_unlock(&local->mtx);
376 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
381 ieee80211_bss_info_change_notify(sdata, bss_change);
383 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
384 mod_timer(&ifibss->timer,
385 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
387 bss_meta.chan = chan;
388 bss_meta.scan_width = cfg80211_chandef_to_scan_width(&chandef);
389 bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt,
390 presp->head_len, GFP_KERNEL);
392 cfg80211_put_bss(local->hw.wiphy, bss);
393 netif_carrier_on(sdata->dev);
394 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
397 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
398 struct ieee80211_bss *bss)
400 struct cfg80211_bss *cbss =
401 container_of((void *)bss, struct cfg80211_bss, priv);
402 struct ieee80211_supported_band *sband;
403 struct cfg80211_chan_def chandef;
406 u16 beacon_int = cbss->beacon_interval;
407 const struct cfg80211_bss_ies *ies;
408 enum nl80211_channel_type chan_type;
413 sdata_assert_lock(sdata);
418 switch (sdata->u.ibss.chandef.width) {
419 case NL80211_CHAN_WIDTH_20_NOHT:
420 case NL80211_CHAN_WIDTH_20:
421 case NL80211_CHAN_WIDTH_40:
422 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
423 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
425 case NL80211_CHAN_WIDTH_5:
426 case NL80211_CHAN_WIDTH_10:
427 cfg80211_chandef_create(&chandef, cbss->channel,
429 chandef.width = sdata->u.ibss.chandef.width;
431 case NL80211_CHAN_WIDTH_80:
432 case NL80211_CHAN_WIDTH_80P80:
433 case NL80211_CHAN_WIDTH_160:
434 chandef = sdata->u.ibss.chandef;
435 chandef.chan = cbss->channel;
438 /* fall back to 20 MHz for unsupported modes */
439 cfg80211_chandef_create(&chandef, cbss->channel,
444 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
445 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
446 shift = ieee80211_vif_get_shift(&sdata->vif);
450 for (i = 0; i < bss->supp_rates_len; i++) {
451 int rate = bss->supp_rates[i] & 0x7f;
452 bool is_basic = !!(bss->supp_rates[i] & 0x80);
454 for (j = 0; j < sband->n_bitrates; j++) {
456 if ((rate_flags & sband->bitrates[j].flags)
460 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
464 basic_rates |= BIT(j);
471 ies = rcu_dereference(cbss->ies);
475 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
483 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
484 struct cfg80211_csa_settings *csa_settings)
486 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
487 struct beacon_data *presp, *old_presp;
488 struct cfg80211_bss *cbss;
489 const struct cfg80211_bss_ies *ies;
490 u16 capability = WLAN_CAPABILITY_IBSS;
493 sdata_assert_lock(sdata);
496 capability |= WLAN_CAPABILITY_PRIVACY;
498 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
499 ifibss->bssid, ifibss->ssid,
500 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS,
501 IEEE80211_PRIVACY(ifibss->privacy));
507 ies = rcu_dereference(cbss->ies);
510 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
512 old_presp = rcu_dereference_protected(ifibss->presp,
513 lockdep_is_held(&sdata->wdev.mtx));
515 presp = ieee80211_ibss_build_presp(sdata,
516 sdata->vif.bss_conf.beacon_int,
517 sdata->vif.bss_conf.basic_rates,
518 capability, tsf, &ifibss->chandef,
523 rcu_assign_pointer(ifibss->presp, presp);
525 kfree_rcu(old_presp, rcu_head);
527 return BSS_CHANGED_BEACON;
530 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
532 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
533 struct cfg80211_bss *cbss;
535 sdata_assert_lock(sdata);
537 /* update cfg80211 bss information with the new channel */
538 if (!is_zero_ether_addr(ifibss->bssid)) {
539 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
540 ifibss->chandef.chan,
541 ifibss->bssid, ifibss->ssid,
543 IEEE80211_BSS_TYPE_IBSS,
544 IEEE80211_PRIVACY(ifibss->privacy));
545 /* XXX: should not really modify cfg80211 data */
547 cbss->channel = sdata->csa_chandef.chan;
548 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
552 ifibss->chandef = sdata->csa_chandef;
554 /* generate the beacon */
555 return ieee80211_ibss_csa_beacon(sdata, NULL);
558 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
560 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
562 cancel_work_sync(&ifibss->csa_connection_drop_work);
565 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
568 struct ieee80211_sub_if_data *sdata = sta->sdata;
571 memcpy(addr, sta->sta.addr, ETH_ALEN);
573 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
575 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
576 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
577 /* authorize the station only if the network is not RSN protected. If
578 * not wait for the userspace to authorize it */
579 if (!sta->sdata->u.ibss.control_port)
580 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
582 rate_control_rate_init(sta);
584 /* If it fails, maybe we raced another insertion? */
585 if (sta_info_insert_rcu(sta))
586 return sta_info_get(sdata, addr);
590 static struct sta_info *
591 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
592 const u8 *addr, u32 supp_rates)
595 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
596 struct ieee80211_local *local = sdata->local;
597 struct sta_info *sta;
598 struct ieee80211_chanctx_conf *chanctx_conf;
599 struct ieee80211_supported_band *sband;
600 enum nl80211_bss_scan_width scan_width;
604 * XXX: Consider removing the least recently used entry and
605 * allow new one to be added.
607 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
608 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
614 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
619 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
625 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
626 if (WARN_ON_ONCE(!chanctx_conf))
628 band = chanctx_conf->def.chan->band;
629 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
632 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
638 /* make sure mandatory rates are always added */
639 sband = local->hw.wiphy->bands[band];
640 sta->sta.deflink.supp_rates[band] = supp_rates |
641 ieee80211_mandatory_rates(sband, scan_width);
643 return ieee80211_ibss_finish_sta(sta);
646 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
648 struct ieee80211_local *local = sdata->local;
650 struct sta_info *sta;
652 sdata_assert_lock(sdata);
656 list_for_each_entry_rcu(sta, &local->sta_list, list) {
657 unsigned long last_active = ieee80211_sta_last_active(sta);
659 if (sta->sdata == sdata &&
660 time_is_after_jiffies(last_active +
661 IEEE80211_IBSS_MERGE_INTERVAL)) {
672 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
674 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
675 struct ieee80211_local *local = sdata->local;
676 struct cfg80211_bss *cbss;
677 struct beacon_data *presp;
678 struct sta_info *sta;
680 if (!is_zero_ether_addr(ifibss->bssid)) {
681 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
682 ifibss->bssid, ifibss->ssid,
684 IEEE80211_BSS_TYPE_IBSS,
685 IEEE80211_PRIVACY(ifibss->privacy));
688 cfg80211_unlink_bss(local->hw.wiphy, cbss);
689 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
693 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
695 sta_info_flush(sdata);
697 spin_lock_bh(&ifibss->incomplete_lock);
698 while (!list_empty(&ifibss->incomplete_stations)) {
699 sta = list_first_entry(&ifibss->incomplete_stations,
700 struct sta_info, list);
701 list_del(&sta->list);
702 spin_unlock_bh(&ifibss->incomplete_lock);
704 sta_info_free(local, sta);
705 spin_lock_bh(&ifibss->incomplete_lock);
707 spin_unlock_bh(&ifibss->incomplete_lock);
709 netif_carrier_off(sdata->dev);
711 sdata->vif.bss_conf.ibss_joined = false;
712 sdata->vif.bss_conf.ibss_creator = false;
713 sdata->vif.bss_conf.enable_beacon = false;
714 sdata->vif.bss_conf.ssid_len = 0;
717 presp = rcu_dereference_protected(ifibss->presp,
718 lockdep_is_held(&sdata->wdev.mtx));
719 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
721 kfree_rcu(presp, rcu_head);
723 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
724 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
726 drv_leave_ibss(local, sdata);
727 mutex_lock(&local->mtx);
728 ieee80211_vif_release_channel(sdata);
729 mutex_unlock(&local->mtx);
732 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
734 struct ieee80211_sub_if_data *sdata =
735 container_of(work, struct ieee80211_sub_if_data,
736 u.ibss.csa_connection_drop_work);
740 ieee80211_ibss_disconnect(sdata);
742 skb_queue_purge(&sdata->skb_queue);
744 /* trigger a scan to find another IBSS network to join */
745 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
750 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
752 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
755 /* if the current channel is a DFS channel, mark the channel as
758 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
760 NL80211_IFTYPE_ADHOC);
762 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
767 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
768 struct ieee802_11_elems *elems,
771 struct cfg80211_csa_settings params;
772 struct ieee80211_csa_ie csa_ie;
773 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
774 enum nl80211_channel_type ch_type;
777 u32 vht_cap_info = 0;
779 sdata_assert_lock(sdata);
781 sta_flags = IEEE80211_STA_DISABLE_VHT;
782 switch (ifibss->chandef.width) {
783 case NL80211_CHAN_WIDTH_5:
784 case NL80211_CHAN_WIDTH_10:
785 case NL80211_CHAN_WIDTH_20_NOHT:
786 sta_flags |= IEEE80211_STA_DISABLE_HT;
788 case NL80211_CHAN_WIDTH_20:
789 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
795 if (elems->vht_cap_elem)
796 vht_cap_info = le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
798 memset(¶ms, 0, sizeof(params));
799 err = ieee80211_parse_ch_switch_ie(sdata, elems,
800 ifibss->chandef.chan->band,
802 sta_flags, ifibss->bssid, &csa_ie);
803 /* can't switch to destination channel, fail */
807 /* did not contain a CSA */
811 /* channel switch is not supported, disconnect */
812 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
815 params.count = csa_ie.count;
816 params.chandef = csa_ie.chandef;
818 switch (ifibss->chandef.width) {
819 case NL80211_CHAN_WIDTH_20_NOHT:
820 case NL80211_CHAN_WIDTH_20:
821 case NL80211_CHAN_WIDTH_40:
822 /* keep our current HT mode (HT20/HT40+/HT40-), even if
823 * another mode has been announced. The mode is not adopted
824 * within the beacon while doing CSA and we should therefore
825 * keep the mode which we announce.
827 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
828 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan,
831 case NL80211_CHAN_WIDTH_5:
832 case NL80211_CHAN_WIDTH_10:
833 if (params.chandef.width != ifibss->chandef.width) {
835 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
837 params.chandef.chan->center_freq,
838 params.chandef.width,
839 params.chandef.center_freq1,
840 params.chandef.center_freq2);
845 /* should not happen, sta_flags should prevent VHT modes. */
850 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef,
851 NL80211_IFTYPE_ADHOC)) {
853 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
855 params.chandef.chan->center_freq,
856 params.chandef.width,
857 params.chandef.center_freq1,
858 params.chandef.center_freq2);
862 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
864 NL80211_IFTYPE_ADHOC);
867 if (err > 0 && !ifibss->userspace_handles_dfs) {
868 /* IBSS-DFS only allowed with a control program */
872 params.radar_required = err;
874 if (cfg80211_chandef_identical(¶ms.chandef,
875 &sdata->vif.bss_conf.chandef)) {
877 "received csa with an identical chandef, ignoring\n");
881 /* all checks done, now perform the channel switch. */
883 "received channel switch announcement to go to channel %d MHz\n",
884 params.chandef.chan->center_freq);
886 params.block_tx = !!csa_ie.mode;
888 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
892 ieee80211_ibss_csa_mark_radar(sdata);
896 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
897 ieee80211_queue_work(&sdata->local->hw,
898 &ifibss->csa_connection_drop_work);
900 ieee80211_ibss_csa_mark_radar(sdata);
906 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
907 struct ieee80211_mgmt *mgmt, size_t len,
908 struct ieee80211_rx_status *rx_status,
909 struct ieee802_11_elems *elems)
913 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
916 /* CSA is the only action we handle for now */
917 if (mgmt->u.action.u.measurement.action_code !=
918 WLAN_ACTION_SPCT_CHL_SWITCH)
921 required_len = IEEE80211_MIN_ACTION_SIZE +
922 sizeof(mgmt->u.action.u.chan_switch);
923 if (len < required_len)
926 if (!sdata->vif.csa_active)
927 ieee80211_ibss_process_chanswitch(sdata, elems, false);
930 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
931 struct ieee80211_mgmt *mgmt,
934 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
936 if (len < IEEE80211_DEAUTH_FRAME_LEN)
939 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
940 ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason);
941 sta_info_destroy_addr(sdata, mgmt->sa);
944 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
945 struct ieee80211_mgmt *mgmt,
948 u16 auth_alg, auth_transaction;
950 sdata_assert_lock(sdata);
955 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
956 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
958 ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
959 ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n",
960 mgmt->bssid, auth_transaction);
962 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
966 * IEEE 802.11 standard does not require authentication in IBSS
967 * networks and most implementations do not seem to use it.
968 * However, try to reply to authentication attempts if someone
969 * has actually implemented this.
971 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
972 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
975 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
976 struct ieee80211_mgmt *mgmt, size_t len,
977 struct ieee80211_rx_status *rx_status,
978 struct ieee802_11_elems *elems,
979 struct ieee80211_channel *channel)
981 struct sta_info *sta;
982 enum nl80211_band band = rx_status->band;
983 enum nl80211_bss_scan_width scan_width;
984 struct ieee80211_local *local = sdata->local;
985 struct ieee80211_supported_band *sband;
986 bool rates_updated = false;
989 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
992 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
995 sband = local->hw.wiphy->bands[band];
1000 sta = sta_info_get(sdata, mgmt->sa);
1002 if (elems->supp_rates) {
1003 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1008 prev_rates = sta->sta.deflink.supp_rates[band];
1009 /* make sure mandatory rates are always added */
1010 scan_width = NL80211_BSS_CHAN_WIDTH_20;
1011 if (rx_status->bw == RATE_INFO_BW_5)
1012 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1013 else if (rx_status->bw == RATE_INFO_BW_10)
1014 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1016 sta->sta.deflink.supp_rates[band] = supp_rates |
1017 ieee80211_mandatory_rates(sband, scan_width);
1018 if (sta->sta.deflink.supp_rates[band] != prev_rates) {
1020 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1021 sta->sta.addr, prev_rates,
1022 sta->sta.deflink.supp_rates[band]);
1023 rates_updated = true;
1027 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1028 mgmt->sa, supp_rates);
1032 if (sta && !sta->sta.wme &&
1033 (elems->wmm_info || elems->s1g_capab) &&
1034 local->hw.queues >= IEEE80211_NUM_ACS) {
1035 sta->sta.wme = true;
1036 ieee80211_check_fast_xmit(sta);
1039 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1040 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1041 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1042 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1043 /* we both use HT */
1044 struct ieee80211_ht_cap htcap_ie;
1045 struct cfg80211_chan_def chandef;
1046 enum ieee80211_sta_rx_bandwidth bw = sta->sta.deflink.bandwidth;
1048 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT);
1049 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef);
1051 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1052 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1056 if (elems->vht_operation && elems->vht_cap_elem &&
1057 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1058 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1059 /* we both use VHT */
1060 struct ieee80211_vht_cap cap_ie;
1061 struct ieee80211_sta_vht_cap cap = sta->sta.deflink.vht_cap;
1063 le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
1065 ieee80211_chandef_vht_oper(&local->hw, vht_cap_info,
1066 elems->vht_operation,
1067 elems->ht_operation,
1069 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1070 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1072 if (memcmp(&cap, &sta->sta.deflink.vht_cap, sizeof(cap)))
1073 rates_updated |= true;
1076 if (bw != sta->sta.deflink.bandwidth)
1077 rates_updated |= true;
1079 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1084 if (sta && rates_updated) {
1085 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1086 u8 rx_nss = sta->sta.deflink.rx_nss;
1088 /* Force rx_nss recalculation */
1089 sta->sta.deflink.rx_nss = 0;
1090 rate_control_rate_init(sta);
1091 if (sta->sta.deflink.rx_nss != rx_nss)
1092 changed |= IEEE80211_RC_NSS_CHANGED;
1094 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1100 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1101 struct ieee80211_mgmt *mgmt, size_t len,
1102 struct ieee80211_rx_status *rx_status,
1103 struct ieee802_11_elems *elems)
1105 struct ieee80211_local *local = sdata->local;
1106 struct cfg80211_bss *cbss;
1107 struct ieee80211_bss *bss;
1108 struct ieee80211_channel *channel;
1109 u64 beacon_timestamp, rx_timestamp;
1111 enum nl80211_band band = rx_status->band;
1113 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1117 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1119 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel);
1123 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1125 /* same for beacon and probe response */
1126 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1128 /* check if we need to merge IBSS */
1131 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1134 /* different channel */
1135 if (sdata->u.ibss.fixed_channel &&
1136 sdata->u.ibss.chandef.chan != cbss->channel)
1139 /* different SSID */
1140 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1141 memcmp(elems->ssid, sdata->u.ibss.ssid,
1142 sdata->u.ibss.ssid_len))
1145 /* process channel switch */
1146 if (sdata->vif.csa_active ||
1147 ieee80211_ibss_process_chanswitch(sdata, elems, true))
1151 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1154 /* we use a fixed BSSID */
1155 if (sdata->u.ibss.fixed_bssid)
1158 if (ieee80211_have_rx_timestamp(rx_status)) {
1159 /* time when timestamp field was received */
1161 ieee80211_calculate_rx_timestamp(local, rx_status,
1165 * second best option: get current TSF
1166 * (will return -1 if not supported)
1168 rx_timestamp = drv_get_tsf(local, sdata);
1171 ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n",
1172 mgmt->sa, mgmt->bssid,
1173 (unsigned long long)rx_timestamp);
1174 ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n",
1175 (unsigned long long)beacon_timestamp,
1176 (unsigned long long)(rx_timestamp - beacon_timestamp),
1179 if (beacon_timestamp > rx_timestamp) {
1181 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1183 ieee80211_sta_join_ibss(sdata, bss);
1184 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1185 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1191 ieee80211_rx_bss_put(local, bss);
1194 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1195 const u8 *bssid, const u8 *addr,
1198 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1199 struct ieee80211_local *local = sdata->local;
1200 struct sta_info *sta;
1201 struct ieee80211_chanctx_conf *chanctx_conf;
1202 struct ieee80211_supported_band *sband;
1203 enum nl80211_bss_scan_width scan_width;
1207 * XXX: Consider removing the least recently used entry and
1208 * allow new one to be added.
1210 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1211 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1216 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1219 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1223 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1224 if (WARN_ON_ONCE(!chanctx_conf)) {
1228 band = chanctx_conf->def.chan->band;
1229 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1232 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1236 /* make sure mandatory rates are always added */
1237 sband = local->hw.wiphy->bands[band];
1238 sta->sta.deflink.supp_rates[band] = supp_rates |
1239 ieee80211_mandatory_rates(sband, scan_width);
1241 spin_lock(&ifibss->incomplete_lock);
1242 list_add(&sta->list, &ifibss->incomplete_stations);
1243 spin_unlock(&ifibss->incomplete_lock);
1244 ieee80211_queue_work(&local->hw, &sdata->work);
1247 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1249 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1250 struct ieee80211_local *local = sdata->local;
1251 struct sta_info *sta, *tmp;
1252 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1253 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1255 mutex_lock(&local->sta_mtx);
1257 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1258 unsigned long last_active = ieee80211_sta_last_active(sta);
1260 if (sdata != sta->sdata)
1263 if (time_is_before_jiffies(last_active + exp_time) ||
1264 (time_is_before_jiffies(last_active + exp_rsn) &&
1265 sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1266 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
1268 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1269 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1270 "not authorized " : "", sta->sta.addr);
1272 ieee80211_send_deauth_disassoc(sdata, sta->sta.addr,
1274 IEEE80211_STYPE_DEAUTH,
1275 WLAN_REASON_DEAUTH_LEAVING,
1277 WARN_ON(__sta_info_destroy(sta));
1281 mutex_unlock(&local->sta_mtx);
1285 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1288 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1290 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1291 enum nl80211_bss_scan_width scan_width;
1293 sdata_assert_lock(sdata);
1295 mod_timer(&ifibss->timer,
1296 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1298 ieee80211_ibss_sta_expire(sdata);
1300 if (time_before(jiffies, ifibss->last_scan_completed +
1301 IEEE80211_IBSS_MERGE_INTERVAL))
1304 if (ieee80211_sta_active_ibss(sdata))
1307 if (ifibss->fixed_channel)
1311 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1313 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1314 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1315 NULL, 0, scan_width);
1318 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1320 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1325 sdata_assert_lock(sdata);
1327 if (ifibss->fixed_bssid) {
1328 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1330 /* Generate random, not broadcast, locally administered BSSID. Mix in
1331 * own MAC address to make sure that devices that do not have proper
1332 * random number generator get different BSSID. */
1333 get_random_bytes(bssid, ETH_ALEN);
1334 for (i = 0; i < ETH_ALEN; i++)
1335 bssid[i] ^= sdata->vif.addr[i];
1340 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1342 capability = WLAN_CAPABILITY_IBSS;
1344 if (ifibss->privacy)
1345 capability |= WLAN_CAPABILITY_PRIVACY;
1347 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1348 &ifibss->chandef, ifibss->basic_rates,
1349 capability, 0, true);
1352 static unsigned ibss_setup_channels(struct wiphy *wiphy,
1353 struct ieee80211_channel **channels,
1354 unsigned int channels_max,
1355 u32 center_freq, u32 width)
1357 struct ieee80211_channel *chan = NULL;
1358 unsigned int n_chan = 0;
1359 u32 start_freq, end_freq, freq;
1362 start_freq = center_freq;
1363 end_freq = center_freq;
1365 start_freq = center_freq - width / 2 + 10;
1366 end_freq = center_freq + width / 2 - 10;
1369 for (freq = start_freq; freq <= end_freq; freq += 20) {
1370 chan = ieee80211_get_channel(wiphy, freq);
1373 if (n_chan >= channels_max)
1376 channels[n_chan] = chan;
1384 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1385 const struct cfg80211_chan_def *chandef,
1386 struct ieee80211_channel **channels,
1387 unsigned int channels_max)
1389 unsigned int n_chan = 0;
1390 u32 width, cf1, cf2 = 0;
1392 switch (chandef->width) {
1393 case NL80211_CHAN_WIDTH_40:
1396 case NL80211_CHAN_WIDTH_80P80:
1397 cf2 = chandef->center_freq2;
1399 case NL80211_CHAN_WIDTH_80:
1402 case NL80211_CHAN_WIDTH_160:
1410 cf1 = chandef->center_freq1;
1412 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1415 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1416 channels_max - n_chan, cf2,
1423 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1426 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1428 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1429 struct ieee80211_local *local = sdata->local;
1430 struct cfg80211_bss *cbss;
1431 struct ieee80211_channel *chan = NULL;
1432 const u8 *bssid = NULL;
1433 enum nl80211_bss_scan_width scan_width;
1436 sdata_assert_lock(sdata);
1438 active_ibss = ieee80211_sta_active_ibss(sdata);
1439 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1444 if (ifibss->fixed_bssid)
1445 bssid = ifibss->bssid;
1446 if (ifibss->fixed_channel)
1447 chan = ifibss->chandef.chan;
1448 if (!is_zero_ether_addr(ifibss->bssid))
1449 bssid = ifibss->bssid;
1450 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1451 ifibss->ssid, ifibss->ssid_len,
1452 IEEE80211_BSS_TYPE_IBSS,
1453 IEEE80211_PRIVACY(ifibss->privacy));
1456 struct ieee80211_bss *bss;
1458 bss = (void *)cbss->priv;
1460 "sta_find_ibss: selected %pM current %pM\n",
1461 cbss->bssid, ifibss->bssid);
1463 "Selected IBSS BSSID %pM based on configured SSID\n",
1466 ieee80211_sta_join_ibss(sdata, bss);
1467 ieee80211_rx_bss_put(local, bss);
1471 /* if a fixed bssid and a fixed freq have been provided create the IBSS
1472 * directly and do not waste time scanning
1474 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1475 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1477 ieee80211_sta_create_ibss(sdata);
1482 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1484 /* Selected IBSS not found in current scan results - try to scan */
1485 if (time_after(jiffies, ifibss->last_scan_completed +
1486 IEEE80211_SCAN_INTERVAL)) {
1487 struct ieee80211_channel *channels[8];
1490 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1492 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1494 if (ifibss->fixed_channel) {
1495 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1498 ARRAY_SIZE(channels));
1499 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1500 ifibss->ssid_len, channels,
1503 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1504 ifibss->ssid_len, NULL,
1508 int interval = IEEE80211_SCAN_INTERVAL;
1510 if (time_after(jiffies, ifibss->ibss_join_req +
1511 IEEE80211_IBSS_JOIN_TIMEOUT))
1512 ieee80211_sta_create_ibss(sdata);
1514 mod_timer(&ifibss->timer,
1515 round_jiffies(jiffies + interval));
1519 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1520 struct sk_buff *req)
1522 struct ieee80211_mgmt *mgmt = (void *)req->data;
1523 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1524 struct ieee80211_local *local = sdata->local;
1525 int tx_last_beacon, len = req->len;
1526 struct sk_buff *skb;
1527 struct beacon_data *presp;
1530 sdata_assert_lock(sdata);
1532 presp = rcu_dereference_protected(ifibss->presp,
1533 lockdep_is_held(&sdata->wdev.mtx));
1535 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1536 len < 24 + 2 || !presp)
1539 tx_last_beacon = drv_tx_last_beacon(local);
1541 ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
1542 ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n",
1543 mgmt->bssid, tx_last_beacon);
1545 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1548 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1549 !is_broadcast_ether_addr(mgmt->bssid))
1552 end = ((u8 *) mgmt) + len;
1553 pos = mgmt->u.probe_req.variable;
1554 if (pos[0] != WLAN_EID_SSID ||
1555 pos + 2 + pos[1] > end) {
1556 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1561 (pos[1] != ifibss->ssid_len ||
1562 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1563 /* Ignore ProbeReq for foreign SSID */
1567 /* Reply with ProbeResp */
1568 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1572 skb_reserve(skb, local->tx_headroom);
1573 skb_put_data(skb, presp->head, presp->head_len);
1575 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1576 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1577 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1579 /* avoid excessive retries for probe request to wildcard SSIDs */
1581 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1583 ieee80211_tx_skb(sdata, skb);
1587 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1588 struct ieee80211_mgmt *mgmt, size_t len,
1589 struct ieee80211_rx_status *rx_status)
1592 struct ieee802_11_elems *elems;
1594 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1595 offsetof(typeof(mgmt->u.beacon), variable));
1598 * either beacon or probe_resp but the variable field is at the
1601 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1605 elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable,
1606 len - baselen, false,
1610 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, elems);
1615 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1616 struct sk_buff *skb)
1618 struct ieee80211_rx_status *rx_status;
1619 struct ieee80211_mgmt *mgmt;
1621 struct ieee802_11_elems *elems;
1624 rx_status = IEEE80211_SKB_RXCB(skb);
1625 mgmt = (struct ieee80211_mgmt *) skb->data;
1626 fc = le16_to_cpu(mgmt->frame_control);
1630 if (!sdata->u.ibss.ssid_len)
1631 goto mgmt_out; /* not ready to merge yet */
1633 switch (fc & IEEE80211_FCTL_STYPE) {
1634 case IEEE80211_STYPE_PROBE_REQ:
1635 ieee80211_rx_mgmt_probe_req(sdata, skb);
1637 case IEEE80211_STYPE_PROBE_RESP:
1638 case IEEE80211_STYPE_BEACON:
1639 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1642 case IEEE80211_STYPE_AUTH:
1643 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1645 case IEEE80211_STYPE_DEAUTH:
1646 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1648 case IEEE80211_STYPE_ACTION:
1649 switch (mgmt->u.action.category) {
1650 case WLAN_CATEGORY_SPECTRUM_MGMT:
1651 ies_len = skb->len -
1652 offsetof(struct ieee80211_mgmt,
1653 u.action.u.chan_switch.variable);
1658 elems = ieee802_11_parse_elems(
1659 mgmt->u.action.u.chan_switch.variable,
1660 ies_len, true, mgmt->bssid, NULL);
1662 if (elems && !elems->parse_error)
1663 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt,
1673 sdata_unlock(sdata);
1676 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1678 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1679 struct sta_info *sta;
1684 * Work could be scheduled after scan or similar
1685 * when we aren't even joined (or trying) with a
1688 if (!ifibss->ssid_len)
1691 spin_lock_bh(&ifibss->incomplete_lock);
1692 while (!list_empty(&ifibss->incomplete_stations)) {
1693 sta = list_first_entry(&ifibss->incomplete_stations,
1694 struct sta_info, list);
1695 list_del(&sta->list);
1696 spin_unlock_bh(&ifibss->incomplete_lock);
1698 ieee80211_ibss_finish_sta(sta);
1700 spin_lock_bh(&ifibss->incomplete_lock);
1702 spin_unlock_bh(&ifibss->incomplete_lock);
1704 switch (ifibss->state) {
1705 case IEEE80211_IBSS_MLME_SEARCH:
1706 ieee80211_sta_find_ibss(sdata);
1708 case IEEE80211_IBSS_MLME_JOINED:
1709 ieee80211_sta_merge_ibss(sdata);
1717 sdata_unlock(sdata);
1720 static void ieee80211_ibss_timer(struct timer_list *t)
1722 struct ieee80211_sub_if_data *sdata =
1723 from_timer(sdata, t, u.ibss.timer);
1725 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1728 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1730 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1732 timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0);
1733 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1734 spin_lock_init(&ifibss->incomplete_lock);
1735 INIT_WORK(&ifibss->csa_connection_drop_work,
1736 ieee80211_csa_connection_drop_work);
1739 /* scan finished notification */
1740 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1742 struct ieee80211_sub_if_data *sdata;
1744 mutex_lock(&local->iflist_mtx);
1745 list_for_each_entry(sdata, &local->interfaces, list) {
1746 if (!ieee80211_sdata_running(sdata))
1748 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1750 sdata->u.ibss.last_scan_completed = jiffies;
1752 mutex_unlock(&local->iflist_mtx);
1755 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1756 struct cfg80211_ibss_params *params)
1760 struct ieee80211_supported_band *sband;
1761 enum ieee80211_chanctx_mode chanmode;
1762 struct ieee80211_local *local = sdata->local;
1763 int radar_detect_width = 0;
1767 if (params->chandef.chan->freq_offset) {
1768 /* this may work, but is untested */
1772 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1774 sdata->wdev.iftype);
1779 if (!params->userspace_handles_dfs)
1781 radar_detect_width = BIT(params->chandef.width);
1784 chanmode = (params->channel_fixed && !ret) ?
1785 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1787 mutex_lock(&local->chanctx_mtx);
1788 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode,
1789 radar_detect_width);
1790 mutex_unlock(&local->chanctx_mtx);
1794 if (params->bssid) {
1795 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1796 sdata->u.ibss.fixed_bssid = true;
1798 sdata->u.ibss.fixed_bssid = false;
1800 sdata->u.ibss.privacy = params->privacy;
1801 sdata->u.ibss.control_port = params->control_port;
1802 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1803 sdata->u.ibss.basic_rates = params->basic_rates;
1804 sdata->u.ibss.last_scan_completed = jiffies;
1806 /* fix basic_rates if channel does not support these rates */
1807 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef);
1808 sband = local->hw.wiphy->bands[params->chandef.chan->band];
1809 for (i = 0; i < sband->n_bitrates; i++) {
1810 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1811 sdata->u.ibss.basic_rates &= ~BIT(i);
1813 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1814 sizeof(params->mcast_rate));
1816 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1818 sdata->u.ibss.chandef = params->chandef;
1819 sdata->u.ibss.fixed_channel = params->channel_fixed;
1822 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1824 if (sdata->u.ibss.ie)
1825 sdata->u.ibss.ie_len = params->ie_len;
1828 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1829 sdata->u.ibss.ibss_join_req = jiffies;
1831 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1832 sdata->u.ibss.ssid_len = params->ssid_len;
1834 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa,
1835 sizeof(sdata->u.ibss.ht_capa));
1836 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask,
1837 sizeof(sdata->u.ibss.ht_capa_mask));
1840 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1841 * reserved, but an HT STA shall protect HT transmissions as though
1842 * the HT Protection field were set to non-HT mixed mode.
1844 * In an IBSS, the RIFS Mode field of the HT Operation element is
1845 * also reserved, but an HT STA shall operate as though this field
1849 sdata->vif.bss_conf.ht_operation_mode |=
1850 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1851 | IEEE80211_HT_PARAM_RIFS_MODE;
1853 changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE;
1854 ieee80211_bss_info_change_notify(sdata, changed);
1856 sdata->smps_mode = IEEE80211_SMPS_OFF;
1857 sdata->needed_rx_chains = local->rx_chains;
1858 sdata->control_port_over_nl80211 = params->control_port_over_nl80211;
1860 ieee80211_queue_work(&local->hw, &sdata->work);
1865 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1867 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1869 ieee80211_ibss_disconnect(sdata);
1870 ifibss->ssid_len = 0;
1871 eth_zero_addr(ifibss->bssid);
1874 kfree(sdata->u.ibss.ie);
1875 sdata->u.ibss.ie = NULL;
1876 sdata->u.ibss.ie_len = 0;
1878 /* on the next join, re-program HT parameters */
1879 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1880 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1884 skb_queue_purge(&sdata->skb_queue);
1886 del_timer_sync(&sdata->u.ibss.timer);