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) 2018-2022 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.cfg.ibss_joined) {
248 sdata->vif.cfg.ibss_joined = false;
249 sdata->vif.cfg.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 = sdata_dereference(ifibss->presp, sdata);
259 RCU_INIT_POINTER(ifibss->presp, NULL);
261 kfree_rcu(presp, rcu_head);
263 /* make a copy of the chandef, it could be modified below. */
264 chandef = *req_chandef;
266 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
267 NL80211_IFTYPE_ADHOC)) {
268 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
269 chandef.width == NL80211_CHAN_WIDTH_10 ||
270 chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
271 chandef.width == NL80211_CHAN_WIDTH_20) {
273 "Failed to join IBSS, beacons forbidden\n");
276 chandef.width = NL80211_CHAN_WIDTH_20;
277 chandef.center_freq1 = chan->center_freq;
278 /* check again for downgraded chandef */
279 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
280 NL80211_IFTYPE_ADHOC)) {
282 "Failed to join IBSS, beacons forbidden\n");
287 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
288 &chandef, NL80211_IFTYPE_ADHOC);
291 "Failed to join IBSS, invalid chandef\n");
294 if (err > 0 && !ifibss->userspace_handles_dfs) {
296 "Failed to join IBSS, DFS channel without control program\n");
300 radar_required = err;
302 mutex_lock(&local->mtx);
303 if (ieee80211_link_use_channel(&sdata->deflink, &chandef,
304 ifibss->fixed_channel ?
305 IEEE80211_CHANCTX_SHARED :
306 IEEE80211_CHANCTX_EXCLUSIVE)) {
307 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
308 mutex_unlock(&local->mtx);
311 sdata->deflink.radar_required = radar_required;
312 mutex_unlock(&local->mtx);
314 memcpy(ifibss->bssid, bssid, ETH_ALEN);
316 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
317 capability, tsf, &chandef,
318 &have_higher_than_11mbit, NULL);
322 rcu_assign_pointer(ifibss->presp, presp);
323 mgmt = (void *)presp->head;
325 sdata->vif.bss_conf.enable_beacon = true;
326 sdata->vif.bss_conf.beacon_int = beacon_int;
327 sdata->vif.bss_conf.basic_rates = basic_rates;
328 sdata->vif.cfg.ssid_len = ifibss->ssid_len;
329 memcpy(sdata->vif.cfg.ssid, ifibss->ssid, ifibss->ssid_len);
330 bss_change = BSS_CHANGED_BEACON_INT;
331 bss_change |= ieee80211_reset_erp_info(sdata);
332 bss_change |= BSS_CHANGED_BSSID;
333 bss_change |= BSS_CHANGED_BEACON;
334 bss_change |= BSS_CHANGED_BEACON_ENABLED;
335 bss_change |= BSS_CHANGED_BASIC_RATES;
336 bss_change |= BSS_CHANGED_HT;
337 bss_change |= BSS_CHANGED_IBSS;
338 bss_change |= BSS_CHANGED_SSID;
341 * In 5 GHz/802.11a, we can always use short slot time.
342 * (IEEE 802.11-2012 18.3.8.7)
344 * In 2.4GHz, we must always use long slots in IBSS for compatibility
346 * (IEEE 802.11-2012 19.4.5)
348 * HT follows these specifications (IEEE 802.11-2012 20.3.18)
350 sdata->vif.bss_conf.use_short_slot = chan->band == NL80211_BAND_5GHZ;
351 bss_change |= BSS_CHANGED_ERP_SLOT;
353 /* cf. IEEE 802.11 9.2.12 */
354 sdata->deflink.operating_11g_mode =
355 chan->band == NL80211_BAND_2GHZ && have_higher_than_11mbit;
357 ieee80211_set_wmm_default(&sdata->deflink, true, false);
359 sdata->vif.cfg.ibss_joined = true;
360 sdata->vif.cfg.ibss_creator = creator;
362 err = drv_join_ibss(local, sdata);
364 sdata->vif.cfg.ibss_joined = false;
365 sdata->vif.cfg.ibss_creator = false;
366 sdata->vif.bss_conf.enable_beacon = false;
367 sdata->vif.cfg.ssid_len = 0;
368 RCU_INIT_POINTER(ifibss->presp, NULL);
369 kfree_rcu(presp, rcu_head);
370 mutex_lock(&local->mtx);
371 ieee80211_link_release_channel(&sdata->deflink);
372 mutex_unlock(&local->mtx);
373 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
378 ieee80211_bss_info_change_notify(sdata, bss_change);
380 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
381 mod_timer(&ifibss->timer,
382 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
384 bss_meta.chan = chan;
385 bss_meta.scan_width = cfg80211_chandef_to_scan_width(&chandef);
386 bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt,
387 presp->head_len, GFP_KERNEL);
389 cfg80211_put_bss(local->hw.wiphy, bss);
390 netif_carrier_on(sdata->dev);
391 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
394 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
395 struct ieee80211_bss *bss)
397 struct cfg80211_bss *cbss =
398 container_of((void *)bss, struct cfg80211_bss, priv);
399 struct ieee80211_supported_band *sband;
400 struct cfg80211_chan_def chandef;
403 u16 beacon_int = cbss->beacon_interval;
404 const struct cfg80211_bss_ies *ies;
405 enum nl80211_channel_type chan_type;
410 sdata_assert_lock(sdata);
415 switch (sdata->u.ibss.chandef.width) {
416 case NL80211_CHAN_WIDTH_20_NOHT:
417 case NL80211_CHAN_WIDTH_20:
418 case NL80211_CHAN_WIDTH_40:
419 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
420 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
422 case NL80211_CHAN_WIDTH_5:
423 case NL80211_CHAN_WIDTH_10:
424 cfg80211_chandef_create(&chandef, cbss->channel,
426 chandef.width = sdata->u.ibss.chandef.width;
428 case NL80211_CHAN_WIDTH_80:
429 case NL80211_CHAN_WIDTH_80P80:
430 case NL80211_CHAN_WIDTH_160:
431 chandef = sdata->u.ibss.chandef;
432 chandef.chan = cbss->channel;
435 /* fall back to 20 MHz for unsupported modes */
436 cfg80211_chandef_create(&chandef, cbss->channel,
441 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
442 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
443 shift = ieee80211_vif_get_shift(&sdata->vif);
447 for (i = 0; i < bss->supp_rates_len; i++) {
448 int rate = bss->supp_rates[i] & 0x7f;
449 bool is_basic = !!(bss->supp_rates[i] & 0x80);
451 for (j = 0; j < sband->n_bitrates; j++) {
453 if ((rate_flags & sband->bitrates[j].flags)
457 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
461 basic_rates |= BIT(j);
468 ies = rcu_dereference(cbss->ies);
472 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
480 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
481 struct cfg80211_csa_settings *csa_settings)
483 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
484 struct beacon_data *presp, *old_presp;
485 struct cfg80211_bss *cbss;
486 const struct cfg80211_bss_ies *ies;
487 u16 capability = WLAN_CAPABILITY_IBSS;
490 sdata_assert_lock(sdata);
493 capability |= WLAN_CAPABILITY_PRIVACY;
495 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
496 ifibss->bssid, ifibss->ssid,
497 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS,
498 IEEE80211_PRIVACY(ifibss->privacy));
504 ies = rcu_dereference(cbss->ies);
507 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
509 old_presp = sdata_dereference(ifibss->presp, sdata);
511 presp = ieee80211_ibss_build_presp(sdata,
512 sdata->vif.bss_conf.beacon_int,
513 sdata->vif.bss_conf.basic_rates,
514 capability, tsf, &ifibss->chandef,
519 rcu_assign_pointer(ifibss->presp, presp);
521 kfree_rcu(old_presp, rcu_head);
523 return BSS_CHANGED_BEACON;
526 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
528 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
529 struct cfg80211_bss *cbss;
531 sdata_assert_lock(sdata);
533 /* update cfg80211 bss information with the new channel */
534 if (!is_zero_ether_addr(ifibss->bssid)) {
535 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
536 ifibss->chandef.chan,
537 ifibss->bssid, ifibss->ssid,
539 IEEE80211_BSS_TYPE_IBSS,
540 IEEE80211_PRIVACY(ifibss->privacy));
541 /* XXX: should not really modify cfg80211 data */
543 cbss->channel = sdata->deflink.csa_chandef.chan;
544 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
548 ifibss->chandef = sdata->deflink.csa_chandef;
550 /* generate the beacon */
551 return ieee80211_ibss_csa_beacon(sdata, NULL);
554 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
556 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
558 cancel_work_sync(&ifibss->csa_connection_drop_work);
561 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
564 struct ieee80211_sub_if_data *sdata = sta->sdata;
567 memcpy(addr, sta->sta.addr, ETH_ALEN);
569 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
571 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
572 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
573 /* authorize the station only if the network is not RSN protected. If
574 * not wait for the userspace to authorize it */
575 if (!sta->sdata->u.ibss.control_port)
576 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
578 rate_control_rate_init(sta);
580 /* If it fails, maybe we raced another insertion? */
581 if (sta_info_insert_rcu(sta))
582 return sta_info_get(sdata, addr);
586 static struct sta_info *
587 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
588 const u8 *addr, u32 supp_rates)
591 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
592 struct ieee80211_local *local = sdata->local;
593 struct sta_info *sta;
594 struct ieee80211_chanctx_conf *chanctx_conf;
595 struct ieee80211_supported_band *sband;
596 enum nl80211_bss_scan_width scan_width;
600 * XXX: Consider removing the least recently used entry and
601 * allow new one to be added.
603 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
604 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
610 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
615 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
621 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
622 if (WARN_ON_ONCE(!chanctx_conf))
624 band = chanctx_conf->def.chan->band;
625 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
628 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
634 /* make sure mandatory rates are always added */
635 sband = local->hw.wiphy->bands[band];
636 sta->sta.deflink.supp_rates[band] = supp_rates |
637 ieee80211_mandatory_rates(sband, scan_width);
639 return ieee80211_ibss_finish_sta(sta);
642 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
644 struct ieee80211_local *local = sdata->local;
646 struct sta_info *sta;
648 sdata_assert_lock(sdata);
652 list_for_each_entry_rcu(sta, &local->sta_list, list) {
653 unsigned long last_active = ieee80211_sta_last_active(sta);
655 if (sta->sdata == sdata &&
656 time_is_after_jiffies(last_active +
657 IEEE80211_IBSS_MERGE_INTERVAL)) {
668 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
670 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
671 struct ieee80211_local *local = sdata->local;
672 struct cfg80211_bss *cbss;
673 struct beacon_data *presp;
674 struct sta_info *sta;
676 if (!is_zero_ether_addr(ifibss->bssid)) {
677 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
678 ifibss->bssid, ifibss->ssid,
680 IEEE80211_BSS_TYPE_IBSS,
681 IEEE80211_PRIVACY(ifibss->privacy));
684 cfg80211_unlink_bss(local->hw.wiphy, cbss);
685 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
689 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
691 sta_info_flush(sdata);
693 spin_lock_bh(&ifibss->incomplete_lock);
694 while (!list_empty(&ifibss->incomplete_stations)) {
695 sta = list_first_entry(&ifibss->incomplete_stations,
696 struct sta_info, list);
697 list_del(&sta->list);
698 spin_unlock_bh(&ifibss->incomplete_lock);
700 sta_info_free(local, sta);
701 spin_lock_bh(&ifibss->incomplete_lock);
703 spin_unlock_bh(&ifibss->incomplete_lock);
705 netif_carrier_off(sdata->dev);
707 sdata->vif.cfg.ibss_joined = false;
708 sdata->vif.cfg.ibss_creator = false;
709 sdata->vif.bss_conf.enable_beacon = false;
710 sdata->vif.cfg.ssid_len = 0;
713 presp = sdata_dereference(ifibss->presp, sdata);
714 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
716 kfree_rcu(presp, rcu_head);
718 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
719 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
721 drv_leave_ibss(local, sdata);
722 mutex_lock(&local->mtx);
723 ieee80211_link_release_channel(&sdata->deflink);
724 mutex_unlock(&local->mtx);
727 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
729 struct ieee80211_sub_if_data *sdata =
730 container_of(work, struct ieee80211_sub_if_data,
731 u.ibss.csa_connection_drop_work);
735 ieee80211_ibss_disconnect(sdata);
737 skb_queue_purge(&sdata->skb_queue);
739 /* trigger a scan to find another IBSS network to join */
740 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
745 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
747 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
750 /* if the current channel is a DFS channel, mark the channel as
753 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
755 NL80211_IFTYPE_ADHOC);
757 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
762 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
763 struct ieee802_11_elems *elems,
766 struct cfg80211_csa_settings params;
767 struct ieee80211_csa_ie csa_ie;
768 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
769 enum nl80211_channel_type ch_type;
771 ieee80211_conn_flags_t conn_flags;
772 u32 vht_cap_info = 0;
774 sdata_assert_lock(sdata);
776 conn_flags = IEEE80211_CONN_DISABLE_VHT;
778 switch (ifibss->chandef.width) {
779 case NL80211_CHAN_WIDTH_5:
780 case NL80211_CHAN_WIDTH_10:
781 case NL80211_CHAN_WIDTH_20_NOHT:
782 conn_flags |= IEEE80211_CONN_DISABLE_HT;
784 case NL80211_CHAN_WIDTH_20:
785 conn_flags |= IEEE80211_CONN_DISABLE_40MHZ;
791 if (elems->vht_cap_elem)
792 vht_cap_info = le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
794 memset(¶ms, 0, sizeof(params));
795 err = ieee80211_parse_ch_switch_ie(sdata, elems,
796 ifibss->chandef.chan->band,
798 conn_flags, ifibss->bssid, &csa_ie);
799 /* can't switch to destination channel, fail */
803 /* did not contain a CSA */
807 /* channel switch is not supported, disconnect */
808 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
811 params.count = csa_ie.count;
812 params.chandef = csa_ie.chandef;
814 switch (ifibss->chandef.width) {
815 case NL80211_CHAN_WIDTH_20_NOHT:
816 case NL80211_CHAN_WIDTH_20:
817 case NL80211_CHAN_WIDTH_40:
818 /* keep our current HT mode (HT20/HT40+/HT40-), even if
819 * another mode has been announced. The mode is not adopted
820 * within the beacon while doing CSA and we should therefore
821 * keep the mode which we announce.
823 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
824 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan,
827 case NL80211_CHAN_WIDTH_5:
828 case NL80211_CHAN_WIDTH_10:
829 if (params.chandef.width != ifibss->chandef.width) {
831 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
833 params.chandef.chan->center_freq,
834 params.chandef.width,
835 params.chandef.center_freq1,
836 params.chandef.center_freq2);
841 /* should not happen, conn_flags should prevent VHT modes. */
846 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef,
847 NL80211_IFTYPE_ADHOC)) {
849 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
851 params.chandef.chan->center_freq,
852 params.chandef.width,
853 params.chandef.center_freq1,
854 params.chandef.center_freq2);
858 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
860 NL80211_IFTYPE_ADHOC);
863 if (err > 0 && !ifibss->userspace_handles_dfs) {
864 /* IBSS-DFS only allowed with a control program */
868 params.radar_required = err;
870 if (cfg80211_chandef_identical(¶ms.chandef,
871 &sdata->vif.bss_conf.chandef)) {
873 "received csa with an identical chandef, ignoring\n");
877 /* all checks done, now perform the channel switch. */
879 "received channel switch announcement to go to channel %d MHz\n",
880 params.chandef.chan->center_freq);
882 params.block_tx = !!csa_ie.mode;
884 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
888 ieee80211_ibss_csa_mark_radar(sdata);
892 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
893 ieee80211_queue_work(&sdata->local->hw,
894 &ifibss->csa_connection_drop_work);
896 ieee80211_ibss_csa_mark_radar(sdata);
902 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
903 struct ieee80211_mgmt *mgmt, size_t len,
904 struct ieee80211_rx_status *rx_status,
905 struct ieee802_11_elems *elems)
909 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
912 /* CSA is the only action we handle for now */
913 if (mgmt->u.action.u.measurement.action_code !=
914 WLAN_ACTION_SPCT_CHL_SWITCH)
917 required_len = IEEE80211_MIN_ACTION_SIZE +
918 sizeof(mgmt->u.action.u.chan_switch);
919 if (len < required_len)
922 if (!sdata->vif.bss_conf.csa_active)
923 ieee80211_ibss_process_chanswitch(sdata, elems, false);
926 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
927 struct ieee80211_mgmt *mgmt,
930 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
932 if (len < IEEE80211_DEAUTH_FRAME_LEN)
935 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
936 ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason);
937 sta_info_destroy_addr(sdata, mgmt->sa);
940 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
941 struct ieee80211_mgmt *mgmt,
944 u16 auth_alg, auth_transaction;
946 sdata_assert_lock(sdata);
951 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
952 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
954 ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
955 ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n",
956 mgmt->bssid, auth_transaction);
958 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
962 * IEEE 802.11 standard does not require authentication in IBSS
963 * networks and most implementations do not seem to use it.
964 * However, try to reply to authentication attempts if someone
965 * has actually implemented this.
967 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
968 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
971 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
972 struct ieee80211_mgmt *mgmt, size_t len,
973 struct ieee80211_rx_status *rx_status,
974 struct ieee802_11_elems *elems,
975 struct ieee80211_channel *channel)
977 struct sta_info *sta;
978 enum nl80211_band band = rx_status->band;
979 enum nl80211_bss_scan_width scan_width;
980 struct ieee80211_local *local = sdata->local;
981 struct ieee80211_supported_band *sband;
982 bool rates_updated = false;
985 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
988 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
991 sband = local->hw.wiphy->bands[band];
996 sta = sta_info_get(sdata, mgmt->sa);
998 if (elems->supp_rates) {
999 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1004 prev_rates = sta->sta.deflink.supp_rates[band];
1005 /* make sure mandatory rates are always added */
1006 scan_width = NL80211_BSS_CHAN_WIDTH_20;
1007 if (rx_status->bw == RATE_INFO_BW_5)
1008 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1009 else if (rx_status->bw == RATE_INFO_BW_10)
1010 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1012 sta->sta.deflink.supp_rates[band] = supp_rates |
1013 ieee80211_mandatory_rates(sband, scan_width);
1014 if (sta->sta.deflink.supp_rates[band] != prev_rates) {
1016 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1017 sta->sta.addr, prev_rates,
1018 sta->sta.deflink.supp_rates[band]);
1019 rates_updated = true;
1023 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1024 mgmt->sa, supp_rates);
1028 if (sta && !sta->sta.wme &&
1029 (elems->wmm_info || elems->s1g_capab) &&
1030 local->hw.queues >= IEEE80211_NUM_ACS) {
1031 sta->sta.wme = true;
1032 ieee80211_check_fast_xmit(sta);
1035 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1036 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1037 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1038 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1039 /* we both use HT */
1040 struct ieee80211_ht_cap htcap_ie;
1041 struct cfg80211_chan_def chandef;
1042 enum ieee80211_sta_rx_bandwidth bw = sta->sta.deflink.bandwidth;
1044 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT);
1045 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef);
1047 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1048 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1052 if (elems->vht_operation && elems->vht_cap_elem &&
1053 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1054 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1055 /* we both use VHT */
1056 struct ieee80211_vht_cap cap_ie;
1057 struct ieee80211_sta_vht_cap cap = sta->sta.deflink.vht_cap;
1059 le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
1061 ieee80211_chandef_vht_oper(&local->hw, vht_cap_info,
1062 elems->vht_operation,
1063 elems->ht_operation,
1065 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1066 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1069 if (memcmp(&cap, &sta->sta.deflink.vht_cap, sizeof(cap)))
1070 rates_updated |= true;
1073 if (bw != sta->sta.deflink.bandwidth)
1074 rates_updated |= true;
1076 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1081 if (sta && rates_updated) {
1082 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1083 u8 rx_nss = sta->sta.deflink.rx_nss;
1085 /* Force rx_nss recalculation */
1086 sta->sta.deflink.rx_nss = 0;
1087 rate_control_rate_init(sta);
1088 if (sta->sta.deflink.rx_nss != rx_nss)
1089 changed |= IEEE80211_RC_NSS_CHANGED;
1091 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1097 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1098 struct ieee80211_mgmt *mgmt, size_t len,
1099 struct ieee80211_rx_status *rx_status,
1100 struct ieee802_11_elems *elems)
1102 struct ieee80211_local *local = sdata->local;
1103 struct cfg80211_bss *cbss;
1104 struct ieee80211_bss *bss;
1105 struct ieee80211_channel *channel;
1106 u64 beacon_timestamp, rx_timestamp;
1108 enum nl80211_band band = rx_status->band;
1110 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1114 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1116 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel);
1120 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1122 /* same for beacon and probe response */
1123 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1125 /* check if we need to merge IBSS */
1128 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1131 /* different channel */
1132 if (sdata->u.ibss.fixed_channel &&
1133 sdata->u.ibss.chandef.chan != cbss->channel)
1136 /* different SSID */
1137 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1138 memcmp(elems->ssid, sdata->u.ibss.ssid,
1139 sdata->u.ibss.ssid_len))
1142 /* process channel switch */
1143 if (sdata->vif.bss_conf.csa_active ||
1144 ieee80211_ibss_process_chanswitch(sdata, elems, true))
1148 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1151 /* we use a fixed BSSID */
1152 if (sdata->u.ibss.fixed_bssid)
1155 if (ieee80211_have_rx_timestamp(rx_status)) {
1156 /* time when timestamp field was received */
1158 ieee80211_calculate_rx_timestamp(local, rx_status,
1162 * second best option: get current TSF
1163 * (will return -1 if not supported)
1165 rx_timestamp = drv_get_tsf(local, sdata);
1168 ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n",
1169 mgmt->sa, mgmt->bssid,
1170 (unsigned long long)rx_timestamp);
1171 ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n",
1172 (unsigned long long)beacon_timestamp,
1173 (unsigned long long)(rx_timestamp - beacon_timestamp),
1176 if (beacon_timestamp > rx_timestamp) {
1178 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1180 ieee80211_sta_join_ibss(sdata, bss);
1181 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1182 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1188 ieee80211_rx_bss_put(local, bss);
1191 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1192 const u8 *bssid, const u8 *addr,
1195 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1196 struct ieee80211_local *local = sdata->local;
1197 struct sta_info *sta;
1198 struct ieee80211_chanctx_conf *chanctx_conf;
1199 struct ieee80211_supported_band *sband;
1200 enum nl80211_bss_scan_width scan_width;
1204 * XXX: Consider removing the least recently used entry and
1205 * allow new one to be added.
1207 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1208 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1213 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1216 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1220 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
1221 if (WARN_ON_ONCE(!chanctx_conf)) {
1225 band = chanctx_conf->def.chan->band;
1226 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1229 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1233 /* make sure mandatory rates are always added */
1234 sband = local->hw.wiphy->bands[band];
1235 sta->sta.deflink.supp_rates[band] = supp_rates |
1236 ieee80211_mandatory_rates(sband, scan_width);
1238 spin_lock(&ifibss->incomplete_lock);
1239 list_add(&sta->list, &ifibss->incomplete_stations);
1240 spin_unlock(&ifibss->incomplete_lock);
1241 ieee80211_queue_work(&local->hw, &sdata->work);
1244 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1246 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1247 struct ieee80211_local *local = sdata->local;
1248 struct sta_info *sta, *tmp;
1249 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1250 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1252 mutex_lock(&local->sta_mtx);
1254 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1255 unsigned long last_active = ieee80211_sta_last_active(sta);
1257 if (sdata != sta->sdata)
1260 if (time_is_before_jiffies(last_active + exp_time) ||
1261 (time_is_before_jiffies(last_active + exp_rsn) &&
1262 sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1263 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
1265 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1266 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1267 "not authorized " : "", sta->sta.addr);
1269 ieee80211_send_deauth_disassoc(sdata, sta->sta.addr,
1271 IEEE80211_STYPE_DEAUTH,
1272 WLAN_REASON_DEAUTH_LEAVING,
1274 WARN_ON(__sta_info_destroy(sta));
1278 mutex_unlock(&local->sta_mtx);
1282 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1285 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1287 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1288 enum nl80211_bss_scan_width scan_width;
1290 sdata_assert_lock(sdata);
1292 mod_timer(&ifibss->timer,
1293 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1295 ieee80211_ibss_sta_expire(sdata);
1297 if (time_before(jiffies, ifibss->last_scan_completed +
1298 IEEE80211_IBSS_MERGE_INTERVAL))
1301 if (ieee80211_sta_active_ibss(sdata))
1304 if (ifibss->fixed_channel)
1308 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1310 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1311 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1312 NULL, 0, scan_width);
1315 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1317 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1322 sdata_assert_lock(sdata);
1324 if (ifibss->fixed_bssid) {
1325 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1327 /* Generate random, not broadcast, locally administered BSSID. Mix in
1328 * own MAC address to make sure that devices that do not have proper
1329 * random number generator get different BSSID. */
1330 get_random_bytes(bssid, ETH_ALEN);
1331 for (i = 0; i < ETH_ALEN; i++)
1332 bssid[i] ^= sdata->vif.addr[i];
1337 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1339 capability = WLAN_CAPABILITY_IBSS;
1341 if (ifibss->privacy)
1342 capability |= WLAN_CAPABILITY_PRIVACY;
1344 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1345 &ifibss->chandef, ifibss->basic_rates,
1346 capability, 0, true);
1349 static unsigned ibss_setup_channels(struct wiphy *wiphy,
1350 struct ieee80211_channel **channels,
1351 unsigned int channels_max,
1352 u32 center_freq, u32 width)
1354 struct ieee80211_channel *chan = NULL;
1355 unsigned int n_chan = 0;
1356 u32 start_freq, end_freq, freq;
1359 start_freq = center_freq;
1360 end_freq = center_freq;
1362 start_freq = center_freq - width / 2 + 10;
1363 end_freq = center_freq + width / 2 - 10;
1366 for (freq = start_freq; freq <= end_freq; freq += 20) {
1367 chan = ieee80211_get_channel(wiphy, freq);
1370 if (n_chan >= channels_max)
1373 channels[n_chan] = chan;
1381 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1382 const struct cfg80211_chan_def *chandef,
1383 struct ieee80211_channel **channels,
1384 unsigned int channels_max)
1386 unsigned int n_chan = 0;
1387 u32 width, cf1, cf2 = 0;
1389 switch (chandef->width) {
1390 case NL80211_CHAN_WIDTH_40:
1393 case NL80211_CHAN_WIDTH_80P80:
1394 cf2 = chandef->center_freq2;
1396 case NL80211_CHAN_WIDTH_80:
1399 case NL80211_CHAN_WIDTH_160:
1407 cf1 = chandef->center_freq1;
1409 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1412 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1413 channels_max - n_chan, cf2,
1420 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1423 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1425 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1426 struct ieee80211_local *local = sdata->local;
1427 struct cfg80211_bss *cbss;
1428 struct ieee80211_channel *chan = NULL;
1429 const u8 *bssid = NULL;
1430 enum nl80211_bss_scan_width scan_width;
1433 sdata_assert_lock(sdata);
1435 active_ibss = ieee80211_sta_active_ibss(sdata);
1436 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1441 if (ifibss->fixed_bssid)
1442 bssid = ifibss->bssid;
1443 if (ifibss->fixed_channel)
1444 chan = ifibss->chandef.chan;
1445 if (!is_zero_ether_addr(ifibss->bssid))
1446 bssid = ifibss->bssid;
1447 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1448 ifibss->ssid, ifibss->ssid_len,
1449 IEEE80211_BSS_TYPE_IBSS,
1450 IEEE80211_PRIVACY(ifibss->privacy));
1453 struct ieee80211_bss *bss;
1455 bss = (void *)cbss->priv;
1457 "sta_find_ibss: selected %pM current %pM\n",
1458 cbss->bssid, ifibss->bssid);
1460 "Selected IBSS BSSID %pM based on configured SSID\n",
1463 ieee80211_sta_join_ibss(sdata, bss);
1464 ieee80211_rx_bss_put(local, bss);
1468 /* if a fixed bssid and a fixed freq have been provided create the IBSS
1469 * directly and do not waste time scanning
1471 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1472 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1474 ieee80211_sta_create_ibss(sdata);
1479 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1481 /* Selected IBSS not found in current scan results - try to scan */
1482 if (time_after(jiffies, ifibss->last_scan_completed +
1483 IEEE80211_SCAN_INTERVAL)) {
1484 struct ieee80211_channel *channels[8];
1487 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1489 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1491 if (ifibss->fixed_channel) {
1492 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1495 ARRAY_SIZE(channels));
1496 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1497 ifibss->ssid_len, channels,
1500 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1501 ifibss->ssid_len, NULL,
1505 int interval = IEEE80211_SCAN_INTERVAL;
1507 if (time_after(jiffies, ifibss->ibss_join_req +
1508 IEEE80211_IBSS_JOIN_TIMEOUT))
1509 ieee80211_sta_create_ibss(sdata);
1511 mod_timer(&ifibss->timer,
1512 round_jiffies(jiffies + interval));
1516 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1517 struct sk_buff *req)
1519 struct ieee80211_mgmt *mgmt = (void *)req->data;
1520 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1521 struct ieee80211_local *local = sdata->local;
1522 int tx_last_beacon, len = req->len;
1523 struct sk_buff *skb;
1524 struct beacon_data *presp;
1527 sdata_assert_lock(sdata);
1529 presp = sdata_dereference(ifibss->presp, sdata);
1531 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1532 len < 24 + 2 || !presp)
1535 tx_last_beacon = drv_tx_last_beacon(local);
1537 ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
1538 ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n",
1539 mgmt->bssid, tx_last_beacon);
1541 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1544 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1545 !is_broadcast_ether_addr(mgmt->bssid))
1548 end = ((u8 *) mgmt) + len;
1549 pos = mgmt->u.probe_req.variable;
1550 if (pos[0] != WLAN_EID_SSID ||
1551 pos + 2 + pos[1] > end) {
1552 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1557 (pos[1] != ifibss->ssid_len ||
1558 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1559 /* Ignore ProbeReq for foreign SSID */
1563 /* Reply with ProbeResp */
1564 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1568 skb_reserve(skb, local->tx_headroom);
1569 skb_put_data(skb, presp->head, presp->head_len);
1571 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1572 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1573 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1575 /* avoid excessive retries for probe request to wildcard SSIDs */
1577 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1579 ieee80211_tx_skb(sdata, skb);
1583 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1584 struct ieee80211_mgmt *mgmt, size_t len,
1585 struct ieee80211_rx_status *rx_status)
1588 struct ieee802_11_elems *elems;
1590 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1591 offsetof(typeof(mgmt->u.beacon), variable));
1594 * either beacon or probe_resp but the variable field is at the
1597 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1601 elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable,
1602 len - baselen, false, NULL);
1605 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, elems);
1610 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1611 struct sk_buff *skb)
1613 struct ieee80211_rx_status *rx_status;
1614 struct ieee80211_mgmt *mgmt;
1616 struct ieee802_11_elems *elems;
1619 rx_status = IEEE80211_SKB_RXCB(skb);
1620 mgmt = (struct ieee80211_mgmt *) skb->data;
1621 fc = le16_to_cpu(mgmt->frame_control);
1625 if (!sdata->u.ibss.ssid_len)
1626 goto mgmt_out; /* not ready to merge yet */
1628 switch (fc & IEEE80211_FCTL_STYPE) {
1629 case IEEE80211_STYPE_PROBE_REQ:
1630 ieee80211_rx_mgmt_probe_req(sdata, skb);
1632 case IEEE80211_STYPE_PROBE_RESP:
1633 case IEEE80211_STYPE_BEACON:
1634 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1637 case IEEE80211_STYPE_AUTH:
1638 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1640 case IEEE80211_STYPE_DEAUTH:
1641 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1643 case IEEE80211_STYPE_ACTION:
1644 switch (mgmt->u.action.category) {
1645 case WLAN_CATEGORY_SPECTRUM_MGMT:
1646 ies_len = skb->len -
1647 offsetof(struct ieee80211_mgmt,
1648 u.action.u.chan_switch.variable);
1653 elems = ieee802_11_parse_elems(
1654 mgmt->u.action.u.chan_switch.variable,
1655 ies_len, true, NULL);
1657 if (elems && !elems->parse_error)
1658 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt,
1668 sdata_unlock(sdata);
1671 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1673 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1674 struct sta_info *sta;
1679 * Work could be scheduled after scan or similar
1680 * when we aren't even joined (or trying) with a
1683 if (!ifibss->ssid_len)
1686 spin_lock_bh(&ifibss->incomplete_lock);
1687 while (!list_empty(&ifibss->incomplete_stations)) {
1688 sta = list_first_entry(&ifibss->incomplete_stations,
1689 struct sta_info, list);
1690 list_del(&sta->list);
1691 spin_unlock_bh(&ifibss->incomplete_lock);
1693 ieee80211_ibss_finish_sta(sta);
1695 spin_lock_bh(&ifibss->incomplete_lock);
1697 spin_unlock_bh(&ifibss->incomplete_lock);
1699 switch (ifibss->state) {
1700 case IEEE80211_IBSS_MLME_SEARCH:
1701 ieee80211_sta_find_ibss(sdata);
1703 case IEEE80211_IBSS_MLME_JOINED:
1704 ieee80211_sta_merge_ibss(sdata);
1712 sdata_unlock(sdata);
1715 static void ieee80211_ibss_timer(struct timer_list *t)
1717 struct ieee80211_sub_if_data *sdata =
1718 from_timer(sdata, t, u.ibss.timer);
1720 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1723 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1725 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1727 timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0);
1728 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1729 spin_lock_init(&ifibss->incomplete_lock);
1730 INIT_WORK(&ifibss->csa_connection_drop_work,
1731 ieee80211_csa_connection_drop_work);
1734 /* scan finished notification */
1735 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1737 struct ieee80211_sub_if_data *sdata;
1739 mutex_lock(&local->iflist_mtx);
1740 list_for_each_entry(sdata, &local->interfaces, list) {
1741 if (!ieee80211_sdata_running(sdata))
1743 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1745 sdata->u.ibss.last_scan_completed = jiffies;
1747 mutex_unlock(&local->iflist_mtx);
1750 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1751 struct cfg80211_ibss_params *params)
1755 struct ieee80211_supported_band *sband;
1756 enum ieee80211_chanctx_mode chanmode;
1757 struct ieee80211_local *local = sdata->local;
1758 int radar_detect_width = 0;
1762 if (params->chandef.chan->freq_offset) {
1763 /* this may work, but is untested */
1767 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1769 sdata->wdev.iftype);
1774 if (!params->userspace_handles_dfs)
1776 radar_detect_width = BIT(params->chandef.width);
1779 chanmode = (params->channel_fixed && !ret) ?
1780 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1782 mutex_lock(&local->chanctx_mtx);
1783 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode,
1784 radar_detect_width);
1785 mutex_unlock(&local->chanctx_mtx);
1789 if (params->bssid) {
1790 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1791 sdata->u.ibss.fixed_bssid = true;
1793 sdata->u.ibss.fixed_bssid = false;
1795 sdata->u.ibss.privacy = params->privacy;
1796 sdata->u.ibss.control_port = params->control_port;
1797 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1798 sdata->u.ibss.basic_rates = params->basic_rates;
1799 sdata->u.ibss.last_scan_completed = jiffies;
1801 /* fix basic_rates if channel does not support these rates */
1802 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef);
1803 sband = local->hw.wiphy->bands[params->chandef.chan->band];
1804 for (i = 0; i < sband->n_bitrates; i++) {
1805 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1806 sdata->u.ibss.basic_rates &= ~BIT(i);
1808 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1809 sizeof(params->mcast_rate));
1811 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1813 sdata->u.ibss.chandef = params->chandef;
1814 sdata->u.ibss.fixed_channel = params->channel_fixed;
1817 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1819 if (sdata->u.ibss.ie)
1820 sdata->u.ibss.ie_len = params->ie_len;
1823 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1824 sdata->u.ibss.ibss_join_req = jiffies;
1826 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1827 sdata->u.ibss.ssid_len = params->ssid_len;
1829 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa,
1830 sizeof(sdata->u.ibss.ht_capa));
1831 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask,
1832 sizeof(sdata->u.ibss.ht_capa_mask));
1835 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1836 * reserved, but an HT STA shall protect HT transmissions as though
1837 * the HT Protection field were set to non-HT mixed mode.
1839 * In an IBSS, the RIFS Mode field of the HT Operation element is
1840 * also reserved, but an HT STA shall operate as though this field
1844 sdata->vif.bss_conf.ht_operation_mode |=
1845 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1846 | IEEE80211_HT_PARAM_RIFS_MODE;
1848 changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE;
1849 ieee80211_link_info_change_notify(sdata, &sdata->deflink, changed);
1851 sdata->deflink.smps_mode = IEEE80211_SMPS_OFF;
1852 sdata->deflink.needed_rx_chains = local->rx_chains;
1853 sdata->control_port_over_nl80211 = params->control_port_over_nl80211;
1855 ieee80211_queue_work(&local->hw, &sdata->work);
1860 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1862 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1864 ieee80211_ibss_disconnect(sdata);
1865 ifibss->ssid_len = 0;
1866 eth_zero_addr(ifibss->bssid);
1869 kfree(sdata->u.ibss.ie);
1870 sdata->u.ibss.ie = NULL;
1871 sdata->u.ibss.ie_len = 0;
1873 /* on the next join, re-program HT parameters */
1874 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1875 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1879 skb_queue_purge(&sdata->skb_queue);
1881 del_timer_sync(&sdata->u.ibss.timer);