2 * IBSS mode implementation
3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 * Copyright 2009, Johannes Berg <johannes@sipsolutions.net>
9 * Copyright 2013-2014 Intel Mobile Communications GmbH
10 * Copyright(c) 2016 Intel Deutschland GmbH
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
17 #include <linux/delay.h>
18 #include <linux/slab.h>
19 #include <linux/if_ether.h>
20 #include <linux/skbuff.h>
21 #include <linux/if_arp.h>
22 #include <linux/etherdevice.h>
23 #include <linux/rtnetlink.h>
24 #include <net/mac80211.h>
26 #include "ieee80211_i.h"
27 #include "driver-ops.h"
30 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
31 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
33 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
34 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
35 #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ)
37 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
39 static struct beacon_data *
40 ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata,
41 const int beacon_int, const u32 basic_rates,
42 const u16 capability, u64 tsf,
43 struct cfg80211_chan_def *chandef,
44 bool *have_higher_than_11mbit,
45 struct cfg80211_csa_settings *csa_settings)
47 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
48 struct ieee80211_local *local = sdata->local;
49 int rates_n = 0, i, ri;
50 struct ieee80211_mgmt *mgmt;
52 struct ieee80211_supported_band *sband;
53 u32 rate_flags, rates = 0, rates_added = 0;
54 struct beacon_data *presp;
58 /* Build IBSS probe response */
59 frame_len = sizeof(struct ieee80211_hdr_3addr) +
60 12 /* struct ieee80211_mgmt.u.beacon */ +
61 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
62 2 + 8 /* max Supported Rates */ +
63 3 /* max DS params */ +
65 5 /* Channel Switch Announcement */ +
66 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
67 2 + sizeof(struct ieee80211_ht_cap) +
68 2 + sizeof(struct ieee80211_ht_operation) +
69 2 + sizeof(struct ieee80211_vht_cap) +
70 2 + sizeof(struct ieee80211_vht_operation) +
72 presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
76 presp->head = (void *)(presp + 1);
78 mgmt = (void *) presp->head;
79 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
80 IEEE80211_STYPE_PROBE_RESP);
81 eth_broadcast_addr(mgmt->da);
82 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
83 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
84 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
85 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
86 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
88 pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
90 *pos++ = WLAN_EID_SSID;
91 *pos++ = ifibss->ssid_len;
92 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
93 pos += ifibss->ssid_len;
95 sband = local->hw.wiphy->bands[chandef->chan->band];
96 rate_flags = ieee80211_chandef_rate_flags(chandef);
97 shift = ieee80211_chandef_get_shift(chandef);
99 if (have_higher_than_11mbit)
100 *have_higher_than_11mbit = false;
102 for (i = 0; i < sband->n_bitrates; i++) {
103 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
105 if (sband->bitrates[i].bitrate > 110 &&
106 have_higher_than_11mbit)
107 *have_higher_than_11mbit = true;
113 *pos++ = WLAN_EID_SUPP_RATES;
114 *pos++ = min_t(int, 8, rates_n);
115 for (ri = 0; ri < sband->n_bitrates; ri++) {
116 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
119 if (!(rates & BIT(ri)))
122 if (basic_rates & BIT(ri))
124 *pos++ = basic | (u8) rate;
125 if (++rates_added == 8) {
126 ri++; /* continue at next rate for EXT_SUPP_RATES */
131 if (sband->band == IEEE80211_BAND_2GHZ) {
132 *pos++ = WLAN_EID_DS_PARAMS;
134 *pos++ = ieee80211_frequency_to_channel(
135 chandef->chan->center_freq);
138 *pos++ = WLAN_EID_IBSS_PARAMS;
140 /* FIX: set ATIM window based on scan results */
145 *pos++ = WLAN_EID_CHANNEL_SWITCH;
147 *pos++ = csa_settings->block_tx ? 1 : 0;
148 *pos++ = ieee80211_frequency_to_channel(
149 csa_settings->chandef.chan->center_freq);
150 presp->csa_counter_offsets[0] = (pos - presp->head);
151 *pos++ = csa_settings->count;
152 presp->csa_current_counter = csa_settings->count;
155 /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
157 *pos++ = WLAN_EID_EXT_SUPP_RATES;
158 *pos++ = rates_n - 8;
159 for (; ri < sband->n_bitrates; ri++) {
160 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
163 if (!(rates & BIT(ri)))
166 if (basic_rates & BIT(ri))
168 *pos++ = basic | (u8) rate;
172 if (ifibss->ie_len) {
173 memcpy(pos, ifibss->ie, ifibss->ie_len);
174 pos += ifibss->ie_len;
177 /* add HT capability and information IEs */
178 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
179 chandef->width != NL80211_CHAN_WIDTH_5 &&
180 chandef->width != NL80211_CHAN_WIDTH_10 &&
181 sband->ht_cap.ht_supported) {
182 struct ieee80211_sta_ht_cap ht_cap;
184 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
185 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
187 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
189 * Note: According to 802.11n-2009 9.13.3.1, HT Protection
190 * field and RIFS Mode are reserved in IBSS mode, therefore
193 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
196 /* add VHT capability and information IEs */
197 if (chandef->width != NL80211_CHAN_WIDTH_20 &&
198 chandef->width != NL80211_CHAN_WIDTH_40 &&
199 sband->vht_cap.vht_supported) {
200 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
202 pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap,
207 if (local->hw.queues >= IEEE80211_NUM_ACS)
208 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */
210 presp->head_len = pos - presp->head;
211 if (WARN_ON(presp->head_len > frame_len))
220 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
221 const u8 *bssid, const int beacon_int,
222 struct cfg80211_chan_def *req_chandef,
223 const u32 basic_rates,
224 const u16 capability, u64 tsf,
227 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
228 struct ieee80211_local *local = sdata->local;
229 struct ieee80211_mgmt *mgmt;
230 struct cfg80211_bss *bss;
232 struct cfg80211_chan_def chandef;
233 struct ieee80211_channel *chan;
234 struct beacon_data *presp;
235 struct cfg80211_inform_bss bss_meta = {};
236 bool have_higher_than_11mbit;
240 sdata_assert_lock(sdata);
242 /* Reset own TSF to allow time synchronization work. */
243 drv_reset_tsf(local, sdata);
245 if (!ether_addr_equal(ifibss->bssid, bssid))
246 sta_info_flush(sdata);
248 /* if merging, indicate to driver that we leave the old IBSS */
249 if (sdata->vif.bss_conf.ibss_joined) {
250 sdata->vif.bss_conf.ibss_joined = false;
251 sdata->vif.bss_conf.ibss_creator = false;
252 sdata->vif.bss_conf.enable_beacon = false;
253 netif_carrier_off(sdata->dev);
254 ieee80211_bss_info_change_notify(sdata,
256 BSS_CHANGED_BEACON_ENABLED);
257 drv_leave_ibss(local, sdata);
260 presp = rcu_dereference_protected(ifibss->presp,
261 lockdep_is_held(&sdata->wdev.mtx));
262 RCU_INIT_POINTER(ifibss->presp, NULL);
264 kfree_rcu(presp, rcu_head);
266 /* make a copy of the chandef, it could be modified below. */
267 chandef = *req_chandef;
269 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
270 NL80211_IFTYPE_ADHOC)) {
271 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
272 chandef.width == NL80211_CHAN_WIDTH_10 ||
273 chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
274 chandef.width == NL80211_CHAN_WIDTH_20) {
276 "Failed to join IBSS, beacons forbidden\n");
279 chandef.width = NL80211_CHAN_WIDTH_20;
280 chandef.center_freq1 = chan->center_freq;
281 /* check again for downgraded chandef */
282 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
283 NL80211_IFTYPE_ADHOC)) {
285 "Failed to join IBSS, beacons forbidden\n");
290 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
291 &chandef, NL80211_IFTYPE_ADHOC);
294 "Failed to join IBSS, invalid chandef\n");
297 if (err > 0 && !ifibss->userspace_handles_dfs) {
299 "Failed to join IBSS, DFS channel without control program\n");
303 radar_required = err;
305 mutex_lock(&local->mtx);
306 if (ieee80211_vif_use_channel(sdata, &chandef,
307 ifibss->fixed_channel ?
308 IEEE80211_CHANCTX_SHARED :
309 IEEE80211_CHANCTX_EXCLUSIVE)) {
310 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
311 mutex_unlock(&local->mtx);
314 sdata->radar_required = radar_required;
315 mutex_unlock(&local->mtx);
317 memcpy(ifibss->bssid, bssid, ETH_ALEN);
319 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
320 capability, tsf, &chandef,
321 &have_higher_than_11mbit, NULL);
325 rcu_assign_pointer(ifibss->presp, presp);
326 mgmt = (void *)presp->head;
328 sdata->vif.bss_conf.enable_beacon = true;
329 sdata->vif.bss_conf.beacon_int = beacon_int;
330 sdata->vif.bss_conf.basic_rates = basic_rates;
331 sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
332 memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
333 bss_change = BSS_CHANGED_BEACON_INT;
334 bss_change |= ieee80211_reset_erp_info(sdata);
335 bss_change |= BSS_CHANGED_BSSID;
336 bss_change |= BSS_CHANGED_BEACON;
337 bss_change |= BSS_CHANGED_BEACON_ENABLED;
338 bss_change |= BSS_CHANGED_BASIC_RATES;
339 bss_change |= BSS_CHANGED_HT;
340 bss_change |= BSS_CHANGED_IBSS;
341 bss_change |= BSS_CHANGED_SSID;
344 * In 5 GHz/802.11a, we can always use short slot time.
345 * (IEEE 802.11-2012 18.3.8.7)
347 * In 2.4GHz, we must always use long slots in IBSS for compatibility
349 * (IEEE 802.11-2012 19.4.5)
351 * HT follows these specifications (IEEE 802.11-2012 20.3.18)
353 sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ;
354 bss_change |= BSS_CHANGED_ERP_SLOT;
356 /* cf. IEEE 802.11 9.2.12 */
357 if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit)
358 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
360 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
362 ieee80211_set_wmm_default(sdata, true, false);
364 sdata->vif.bss_conf.ibss_joined = true;
365 sdata->vif.bss_conf.ibss_creator = creator;
367 err = drv_join_ibss(local, sdata);
369 sdata->vif.bss_conf.ibss_joined = false;
370 sdata->vif.bss_conf.ibss_creator = false;
371 sdata->vif.bss_conf.enable_beacon = false;
372 sdata->vif.bss_conf.ssid_len = 0;
373 RCU_INIT_POINTER(ifibss->presp, NULL);
374 kfree_rcu(presp, rcu_head);
375 mutex_lock(&local->mtx);
376 ieee80211_vif_release_channel(sdata);
377 mutex_unlock(&local->mtx);
378 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
383 ieee80211_bss_info_change_notify(sdata, bss_change);
385 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
386 mod_timer(&ifibss->timer,
387 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
389 bss_meta.chan = chan;
390 bss_meta.scan_width = cfg80211_chandef_to_scan_width(&chandef);
391 bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt,
392 presp->head_len, GFP_KERNEL);
394 cfg80211_put_bss(local->hw.wiphy, bss);
395 netif_carrier_on(sdata->dev);
396 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
399 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
400 struct ieee80211_bss *bss)
402 struct cfg80211_bss *cbss =
403 container_of((void *)bss, struct cfg80211_bss, priv);
404 struct ieee80211_supported_band *sband;
405 struct cfg80211_chan_def chandef;
408 u16 beacon_int = cbss->beacon_interval;
409 const struct cfg80211_bss_ies *ies;
410 enum nl80211_channel_type chan_type;
415 sdata_assert_lock(sdata);
420 switch (sdata->u.ibss.chandef.width) {
421 case NL80211_CHAN_WIDTH_20_NOHT:
422 case NL80211_CHAN_WIDTH_20:
423 case NL80211_CHAN_WIDTH_40:
424 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
425 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
427 case NL80211_CHAN_WIDTH_5:
428 case NL80211_CHAN_WIDTH_10:
429 cfg80211_chandef_create(&chandef, cbss->channel,
430 NL80211_CHAN_WIDTH_20_NOHT);
431 chandef.width = sdata->u.ibss.chandef.width;
433 case NL80211_CHAN_WIDTH_80:
434 case NL80211_CHAN_WIDTH_160:
435 chandef = sdata->u.ibss.chandef;
436 chandef.chan = cbss->channel;
439 /* fall back to 20 MHz for unsupported modes */
440 cfg80211_chandef_create(&chandef, cbss->channel,
441 NL80211_CHAN_WIDTH_20_NOHT);
445 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
446 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
447 shift = ieee80211_vif_get_shift(&sdata->vif);
451 for (i = 0; i < bss->supp_rates_len; i++) {
452 int rate = bss->supp_rates[i] & 0x7f;
453 bool is_basic = !!(bss->supp_rates[i] & 0x80);
455 for (j = 0; j < sband->n_bitrates; j++) {
457 if ((rate_flags & sband->bitrates[j].flags)
461 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
465 basic_rates |= BIT(j);
472 ies = rcu_dereference(cbss->ies);
476 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
484 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
485 struct cfg80211_csa_settings *csa_settings)
487 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
488 struct beacon_data *presp, *old_presp;
489 struct cfg80211_bss *cbss;
490 const struct cfg80211_bss_ies *ies;
491 u16 capability = WLAN_CAPABILITY_IBSS;
495 sdata_assert_lock(sdata);
498 capability |= WLAN_CAPABILITY_PRIVACY;
500 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
501 ifibss->bssid, ifibss->ssid,
502 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS,
503 IEEE80211_PRIVACY(ifibss->privacy));
505 if (WARN_ON(!cbss)) {
511 ies = rcu_dereference(cbss->ies);
514 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
516 old_presp = rcu_dereference_protected(ifibss->presp,
517 lockdep_is_held(&sdata->wdev.mtx));
519 presp = ieee80211_ibss_build_presp(sdata,
520 sdata->vif.bss_conf.beacon_int,
521 sdata->vif.bss_conf.basic_rates,
522 capability, tsf, &ifibss->chandef,
529 rcu_assign_pointer(ifibss->presp, presp);
531 kfree_rcu(old_presp, rcu_head);
533 return BSS_CHANGED_BEACON;
538 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
540 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
541 struct cfg80211_bss *cbss;
542 int err, changed = 0;
544 sdata_assert_lock(sdata);
546 /* update cfg80211 bss information with the new channel */
547 if (!is_zero_ether_addr(ifibss->bssid)) {
548 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
549 ifibss->chandef.chan,
550 ifibss->bssid, ifibss->ssid,
552 IEEE80211_BSS_TYPE_IBSS,
553 IEEE80211_PRIVACY(ifibss->privacy));
554 /* XXX: should not really modify cfg80211 data */
556 cbss->channel = sdata->csa_chandef.chan;
557 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
561 ifibss->chandef = sdata->csa_chandef;
563 /* generate the beacon */
564 err = ieee80211_ibss_csa_beacon(sdata, NULL);
573 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
575 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
577 cancel_work_sync(&ifibss->csa_connection_drop_work);
580 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
583 struct ieee80211_sub_if_data *sdata = sta->sdata;
586 memcpy(addr, sta->sta.addr, ETH_ALEN);
588 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
590 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
591 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
592 /* authorize the station only if the network is not RSN protected. If
593 * not wait for the userspace to authorize it */
594 if (!sta->sdata->u.ibss.control_port)
595 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
597 rate_control_rate_init(sta);
599 /* If it fails, maybe we raced another insertion? */
600 if (sta_info_insert_rcu(sta))
601 return sta_info_get(sdata, addr);
605 static struct sta_info *
606 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
607 const u8 *addr, u32 supp_rates)
610 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
611 struct ieee80211_local *local = sdata->local;
612 struct sta_info *sta;
613 struct ieee80211_chanctx_conf *chanctx_conf;
614 struct ieee80211_supported_band *sband;
615 enum nl80211_bss_scan_width scan_width;
619 * XXX: Consider removing the least recently used entry and
620 * allow new one to be added.
622 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
623 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
629 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
634 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
640 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
641 if (WARN_ON_ONCE(!chanctx_conf))
643 band = chanctx_conf->def.chan->band;
644 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
647 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
653 sta->rx_stats.last_rx = jiffies;
655 /* make sure mandatory rates are always added */
656 sband = local->hw.wiphy->bands[band];
657 sta->sta.supp_rates[band] = supp_rates |
658 ieee80211_mandatory_rates(sband, scan_width);
660 return ieee80211_ibss_finish_sta(sta);
663 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
665 struct ieee80211_local *local = sdata->local;
667 struct sta_info *sta;
669 sdata_assert_lock(sdata);
673 list_for_each_entry_rcu(sta, &local->sta_list, list) {
674 if (sta->sdata == sdata &&
675 time_after(sta->rx_stats.last_rx +
676 IEEE80211_IBSS_MERGE_INTERVAL,
688 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
690 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
691 struct ieee80211_local *local = sdata->local;
692 struct cfg80211_bss *cbss;
693 struct beacon_data *presp;
694 struct sta_info *sta;
696 if (!is_zero_ether_addr(ifibss->bssid)) {
697 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
698 ifibss->bssid, ifibss->ssid,
700 IEEE80211_BSS_TYPE_IBSS,
701 IEEE80211_PRIVACY(ifibss->privacy));
704 cfg80211_unlink_bss(local->hw.wiphy, cbss);
705 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
709 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
711 sta_info_flush(sdata);
713 spin_lock_bh(&ifibss->incomplete_lock);
714 while (!list_empty(&ifibss->incomplete_stations)) {
715 sta = list_first_entry(&ifibss->incomplete_stations,
716 struct sta_info, list);
717 list_del(&sta->list);
718 spin_unlock_bh(&ifibss->incomplete_lock);
720 sta_info_free(local, sta);
721 spin_lock_bh(&ifibss->incomplete_lock);
723 spin_unlock_bh(&ifibss->incomplete_lock);
725 netif_carrier_off(sdata->dev);
727 sdata->vif.bss_conf.ibss_joined = false;
728 sdata->vif.bss_conf.ibss_creator = false;
729 sdata->vif.bss_conf.enable_beacon = false;
730 sdata->vif.bss_conf.ssid_len = 0;
733 presp = rcu_dereference_protected(ifibss->presp,
734 lockdep_is_held(&sdata->wdev.mtx));
735 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
737 kfree_rcu(presp, rcu_head);
739 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
740 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
742 drv_leave_ibss(local, sdata);
743 mutex_lock(&local->mtx);
744 ieee80211_vif_release_channel(sdata);
745 mutex_unlock(&local->mtx);
748 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
750 struct ieee80211_sub_if_data *sdata =
751 container_of(work, struct ieee80211_sub_if_data,
752 u.ibss.csa_connection_drop_work);
756 ieee80211_ibss_disconnect(sdata);
758 skb_queue_purge(&sdata->skb_queue);
760 /* trigger a scan to find another IBSS network to join */
761 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
766 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
768 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
771 /* if the current channel is a DFS channel, mark the channel as
774 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
776 NL80211_IFTYPE_ADHOC);
778 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
783 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
784 struct ieee802_11_elems *elems,
787 struct cfg80211_csa_settings params;
788 struct ieee80211_csa_ie csa_ie;
789 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
790 enum nl80211_channel_type ch_type;
794 sdata_assert_lock(sdata);
796 sta_flags = IEEE80211_STA_DISABLE_VHT;
797 switch (ifibss->chandef.width) {
798 case NL80211_CHAN_WIDTH_5:
799 case NL80211_CHAN_WIDTH_10:
800 case NL80211_CHAN_WIDTH_20_NOHT:
801 sta_flags |= IEEE80211_STA_DISABLE_HT;
803 case NL80211_CHAN_WIDTH_20:
804 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
810 memset(¶ms, 0, sizeof(params));
811 memset(&csa_ie, 0, sizeof(csa_ie));
812 err = ieee80211_parse_ch_switch_ie(sdata, elems,
813 ifibss->chandef.chan->band,
814 sta_flags, ifibss->bssid, &csa_ie);
815 /* can't switch to destination channel, fail */
819 /* did not contain a CSA */
823 /* channel switch is not supported, disconnect */
824 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
827 params.count = csa_ie.count;
828 params.chandef = csa_ie.chandef;
830 switch (ifibss->chandef.width) {
831 case NL80211_CHAN_WIDTH_20_NOHT:
832 case NL80211_CHAN_WIDTH_20:
833 case NL80211_CHAN_WIDTH_40:
834 /* keep our current HT mode (HT20/HT40+/HT40-), even if
835 * another mode has been announced. The mode is not adopted
836 * within the beacon while doing CSA and we should therefore
837 * keep the mode which we announce.
839 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
840 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan,
843 case NL80211_CHAN_WIDTH_5:
844 case NL80211_CHAN_WIDTH_10:
845 if (params.chandef.width != ifibss->chandef.width) {
847 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
849 params.chandef.chan->center_freq,
850 params.chandef.width,
851 params.chandef.center_freq1,
852 params.chandef.center_freq2);
857 /* should not happen, sta_flags should prevent VHT modes. */
862 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef,
863 NL80211_IFTYPE_ADHOC)) {
865 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
867 params.chandef.chan->center_freq,
868 params.chandef.width,
869 params.chandef.center_freq1,
870 params.chandef.center_freq2);
874 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
876 NL80211_IFTYPE_ADHOC);
879 if (err > 0 && !ifibss->userspace_handles_dfs) {
880 /* IBSS-DFS only allowed with a control program */
884 params.radar_required = err;
886 if (cfg80211_chandef_identical(¶ms.chandef,
887 &sdata->vif.bss_conf.chandef)) {
889 "received csa with an identical chandef, ignoring\n");
893 /* all checks done, now perform the channel switch. */
895 "received channel switch announcement to go to channel %d MHz\n",
896 params.chandef.chan->center_freq);
898 params.block_tx = !!csa_ie.mode;
900 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
904 ieee80211_ibss_csa_mark_radar(sdata);
908 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
909 ieee80211_queue_work(&sdata->local->hw,
910 &ifibss->csa_connection_drop_work);
912 ieee80211_ibss_csa_mark_radar(sdata);
918 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
919 struct ieee80211_mgmt *mgmt, size_t len,
920 struct ieee80211_rx_status *rx_status,
921 struct ieee802_11_elems *elems)
925 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
928 /* CSA is the only action we handle for now */
929 if (mgmt->u.action.u.measurement.action_code !=
930 WLAN_ACTION_SPCT_CHL_SWITCH)
933 required_len = IEEE80211_MIN_ACTION_SIZE +
934 sizeof(mgmt->u.action.u.chan_switch);
935 if (len < required_len)
938 if (!sdata->vif.csa_active)
939 ieee80211_ibss_process_chanswitch(sdata, elems, false);
942 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
943 struct ieee80211_mgmt *mgmt,
946 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
948 if (len < IEEE80211_DEAUTH_FRAME_LEN)
951 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
952 ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason);
953 sta_info_destroy_addr(sdata, mgmt->sa);
956 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
957 struct ieee80211_mgmt *mgmt,
960 u16 auth_alg, auth_transaction;
962 sdata_assert_lock(sdata);
967 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
968 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
970 ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
971 ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n",
972 mgmt->bssid, auth_transaction);
974 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
978 * IEEE 802.11 standard does not require authentication in IBSS
979 * networks and most implementations do not seem to use it.
980 * However, try to reply to authentication attempts if someone
981 * has actually implemented this.
983 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
984 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
987 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
988 struct ieee80211_mgmt *mgmt, size_t len,
989 struct ieee80211_rx_status *rx_status,
990 struct ieee802_11_elems *elems,
991 struct ieee80211_channel *channel)
993 struct sta_info *sta;
994 enum ieee80211_band band = rx_status->band;
995 enum nl80211_bss_scan_width scan_width;
996 struct ieee80211_local *local = sdata->local;
997 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
998 bool rates_updated = false;
1001 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1004 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
1008 sta = sta_info_get(sdata, mgmt->sa);
1010 if (elems->supp_rates) {
1011 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1016 prev_rates = sta->sta.supp_rates[band];
1017 /* make sure mandatory rates are always added */
1018 scan_width = NL80211_BSS_CHAN_WIDTH_20;
1019 if (rx_status->flag & RX_FLAG_5MHZ)
1020 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1021 if (rx_status->flag & RX_FLAG_10MHZ)
1022 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1024 sta->sta.supp_rates[band] = supp_rates |
1025 ieee80211_mandatory_rates(sband, scan_width);
1026 if (sta->sta.supp_rates[band] != prev_rates) {
1028 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1029 sta->sta.addr, prev_rates,
1030 sta->sta.supp_rates[band]);
1031 rates_updated = true;
1035 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1036 mgmt->sa, supp_rates);
1040 if (sta && !sta->sta.wme &&
1041 elems->wmm_info && local->hw.queues >= IEEE80211_NUM_ACS) {
1042 sta->sta.wme = true;
1043 ieee80211_check_fast_xmit(sta);
1046 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1047 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1048 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1049 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1050 /* we both use HT */
1051 struct ieee80211_ht_cap htcap_ie;
1052 struct cfg80211_chan_def chandef;
1053 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
1055 ieee80211_ht_oper_to_chandef(channel,
1056 elems->ht_operation,
1059 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1060 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1064 if (elems->vht_operation && elems->vht_cap_elem &&
1065 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1066 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1067 /* we both use VHT */
1068 struct ieee80211_vht_cap cap_ie;
1069 struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap;
1071 ieee80211_vht_oper_to_chandef(channel,
1072 elems->vht_operation,
1074 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1075 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1077 if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap)))
1078 rates_updated |= true;
1081 if (bw != sta->sta.bandwidth)
1082 rates_updated |= true;
1084 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1089 if (sta && rates_updated) {
1090 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1091 u8 rx_nss = sta->sta.rx_nss;
1093 /* Force rx_nss recalculation */
1094 sta->sta.rx_nss = 0;
1095 rate_control_rate_init(sta);
1096 if (sta->sta.rx_nss != rx_nss)
1097 changed |= IEEE80211_RC_NSS_CHANGED;
1099 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1105 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1106 struct ieee80211_mgmt *mgmt, size_t len,
1107 struct ieee80211_rx_status *rx_status,
1108 struct ieee802_11_elems *elems)
1110 struct ieee80211_local *local = sdata->local;
1111 struct cfg80211_bss *cbss;
1112 struct ieee80211_bss *bss;
1113 struct ieee80211_channel *channel;
1114 u64 beacon_timestamp, rx_timestamp;
1116 enum ieee80211_band band = rx_status->band;
1118 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1122 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1124 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1129 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1131 /* same for beacon and probe response */
1132 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1134 /* check if we need to merge IBSS */
1137 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1140 /* different channel */
1141 if (sdata->u.ibss.fixed_channel &&
1142 sdata->u.ibss.chandef.chan != cbss->channel)
1145 /* different SSID */
1146 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1147 memcmp(elems->ssid, sdata->u.ibss.ssid,
1148 sdata->u.ibss.ssid_len))
1151 /* process channel switch */
1152 if (sdata->vif.csa_active ||
1153 ieee80211_ibss_process_chanswitch(sdata, elems, true))
1157 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1160 /* we use a fixed BSSID */
1161 if (sdata->u.ibss.fixed_bssid)
1164 if (ieee80211_have_rx_timestamp(rx_status)) {
1165 /* time when timestamp field was received */
1167 ieee80211_calculate_rx_timestamp(local, rx_status,
1171 * second best option: get current TSF
1172 * (will return -1 if not supported)
1174 rx_timestamp = drv_get_tsf(local, sdata);
1177 ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n",
1178 mgmt->sa, mgmt->bssid,
1179 (unsigned long long)rx_timestamp);
1180 ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n",
1181 (unsigned long long)beacon_timestamp,
1182 (unsigned long long)(rx_timestamp - beacon_timestamp),
1185 if (beacon_timestamp > rx_timestamp) {
1187 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1189 ieee80211_sta_join_ibss(sdata, bss);
1190 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1191 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1197 ieee80211_rx_bss_put(local, bss);
1200 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1201 const u8 *bssid, const u8 *addr,
1204 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1205 struct ieee80211_local *local = sdata->local;
1206 struct sta_info *sta;
1207 struct ieee80211_chanctx_conf *chanctx_conf;
1208 struct ieee80211_supported_band *sband;
1209 enum nl80211_bss_scan_width scan_width;
1213 * XXX: Consider removing the least recently used entry and
1214 * allow new one to be added.
1216 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1217 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1222 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1225 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1229 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1230 if (WARN_ON_ONCE(!chanctx_conf)) {
1234 band = chanctx_conf->def.chan->band;
1235 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1238 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1242 sta->rx_stats.last_rx = jiffies;
1244 /* make sure mandatory rates are always added */
1245 sband = local->hw.wiphy->bands[band];
1246 sta->sta.supp_rates[band] = supp_rates |
1247 ieee80211_mandatory_rates(sband, scan_width);
1249 spin_lock(&ifibss->incomplete_lock);
1250 list_add(&sta->list, &ifibss->incomplete_stations);
1251 spin_unlock(&ifibss->incomplete_lock);
1252 ieee80211_queue_work(&local->hw, &sdata->work);
1255 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1257 struct ieee80211_local *local = sdata->local;
1258 struct sta_info *sta, *tmp;
1259 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1260 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1262 mutex_lock(&local->sta_mtx);
1264 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1265 if (sdata != sta->sdata)
1268 if (time_after(jiffies, sta->rx_stats.last_rx + exp_time) ||
1269 (time_after(jiffies, sta->rx_stats.last_rx + exp_rsn) &&
1270 sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1271 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1272 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1273 "not authorized " : "", sta->sta.addr);
1275 WARN_ON(__sta_info_destroy(sta));
1279 mutex_unlock(&local->sta_mtx);
1283 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1286 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1288 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1289 enum nl80211_bss_scan_width scan_width;
1291 sdata_assert_lock(sdata);
1293 mod_timer(&ifibss->timer,
1294 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1296 ieee80211_ibss_sta_expire(sdata);
1298 if (time_before(jiffies, ifibss->last_scan_completed +
1299 IEEE80211_IBSS_MERGE_INTERVAL))
1302 if (ieee80211_sta_active_ibss(sdata))
1305 if (ifibss->fixed_channel)
1309 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1311 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1312 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1313 NULL, 0, scan_width);
1316 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1318 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1323 sdata_assert_lock(sdata);
1325 if (ifibss->fixed_bssid) {
1326 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1328 /* Generate random, not broadcast, locally administered BSSID. Mix in
1329 * own MAC address to make sure that devices that do not have proper
1330 * random number generator get different BSSID. */
1331 get_random_bytes(bssid, ETH_ALEN);
1332 for (i = 0; i < ETH_ALEN; i++)
1333 bssid[i] ^= sdata->vif.addr[i];
1338 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1340 capability = WLAN_CAPABILITY_IBSS;
1342 if (ifibss->privacy)
1343 capability |= WLAN_CAPABILITY_PRIVACY;
1345 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1346 &ifibss->chandef, ifibss->basic_rates,
1347 capability, 0, true);
1350 static unsigned ibss_setup_channels(struct wiphy *wiphy,
1351 struct ieee80211_channel **channels,
1352 unsigned int channels_max,
1353 u32 center_freq, u32 width)
1355 struct ieee80211_channel *chan = NULL;
1356 unsigned int n_chan = 0;
1357 u32 start_freq, end_freq, freq;
1360 start_freq = center_freq;
1361 end_freq = center_freq;
1363 start_freq = center_freq - width / 2 + 10;
1364 end_freq = center_freq + width / 2 - 10;
1367 for (freq = start_freq; freq <= end_freq; freq += 20) {
1368 chan = ieee80211_get_channel(wiphy, freq);
1371 if (n_chan >= channels_max)
1374 channels[n_chan] = chan;
1382 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1383 const struct cfg80211_chan_def *chandef,
1384 struct ieee80211_channel **channels,
1385 unsigned int channels_max)
1387 unsigned int n_chan = 0;
1388 u32 width, cf1, cf2 = 0;
1390 switch (chandef->width) {
1391 case NL80211_CHAN_WIDTH_40:
1394 case NL80211_CHAN_WIDTH_80P80:
1395 cf2 = chandef->center_freq2;
1397 case NL80211_CHAN_WIDTH_80:
1400 case NL80211_CHAN_WIDTH_160:
1408 cf1 = chandef->center_freq1;
1410 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1413 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1414 channels_max - n_chan, cf2,
1421 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1424 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1426 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1427 struct ieee80211_local *local = sdata->local;
1428 struct cfg80211_bss *cbss;
1429 struct ieee80211_channel *chan = NULL;
1430 const u8 *bssid = NULL;
1431 enum nl80211_bss_scan_width scan_width;
1434 sdata_assert_lock(sdata);
1436 active_ibss = ieee80211_sta_active_ibss(sdata);
1437 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1442 if (ifibss->fixed_bssid)
1443 bssid = ifibss->bssid;
1444 if (ifibss->fixed_channel)
1445 chan = ifibss->chandef.chan;
1446 if (!is_zero_ether_addr(ifibss->bssid))
1447 bssid = ifibss->bssid;
1448 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1449 ifibss->ssid, ifibss->ssid_len,
1450 IEEE80211_BSS_TYPE_IBSS,
1451 IEEE80211_PRIVACY(ifibss->privacy));
1454 struct ieee80211_bss *bss;
1456 bss = (void *)cbss->priv;
1458 "sta_find_ibss: selected %pM current %pM\n",
1459 cbss->bssid, ifibss->bssid);
1461 "Selected IBSS BSSID %pM based on configured SSID\n",
1464 ieee80211_sta_join_ibss(sdata, bss);
1465 ieee80211_rx_bss_put(local, bss);
1469 /* if a fixed bssid and a fixed freq have been provided create the IBSS
1470 * directly and do not waste time scanning
1472 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1473 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1475 ieee80211_sta_create_ibss(sdata);
1480 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1482 /* Selected IBSS not found in current scan results - try to scan */
1483 if (time_after(jiffies, ifibss->last_scan_completed +
1484 IEEE80211_SCAN_INTERVAL)) {
1485 struct ieee80211_channel *channels[8];
1488 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1490 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1492 if (ifibss->fixed_channel) {
1493 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1496 ARRAY_SIZE(channels));
1497 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1498 ifibss->ssid_len, channels,
1501 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1502 ifibss->ssid_len, NULL,
1506 int interval = IEEE80211_SCAN_INTERVAL;
1508 if (time_after(jiffies, ifibss->ibss_join_req +
1509 IEEE80211_IBSS_JOIN_TIMEOUT))
1510 ieee80211_sta_create_ibss(sdata);
1512 mod_timer(&ifibss->timer,
1513 round_jiffies(jiffies + interval));
1517 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1518 struct sk_buff *req)
1520 struct ieee80211_mgmt *mgmt = (void *)req->data;
1521 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1522 struct ieee80211_local *local = sdata->local;
1523 int tx_last_beacon, len = req->len;
1524 struct sk_buff *skb;
1525 struct beacon_data *presp;
1528 sdata_assert_lock(sdata);
1530 presp = rcu_dereference_protected(ifibss->presp,
1531 lockdep_is_held(&sdata->wdev.mtx));
1533 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1534 len < 24 + 2 || !presp)
1537 tx_last_beacon = drv_tx_last_beacon(local);
1539 ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
1540 ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n",
1541 mgmt->bssid, tx_last_beacon);
1543 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1546 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1547 !is_broadcast_ether_addr(mgmt->bssid))
1550 end = ((u8 *) mgmt) + len;
1551 pos = mgmt->u.probe_req.variable;
1552 if (pos[0] != WLAN_EID_SSID ||
1553 pos + 2 + pos[1] > end) {
1554 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1559 (pos[1] != ifibss->ssid_len ||
1560 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1561 /* Ignore ProbeReq for foreign SSID */
1565 /* Reply with ProbeResp */
1566 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1570 skb_reserve(skb, local->tx_headroom);
1571 memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
1573 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1574 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1575 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1577 /* avoid excessive retries for probe request to wildcard SSIDs */
1579 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1581 ieee80211_tx_skb(sdata, skb);
1585 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1586 struct ieee80211_mgmt *mgmt, size_t len,
1587 struct ieee80211_rx_status *rx_status)
1590 struct ieee802_11_elems elems;
1592 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1593 offsetof(typeof(mgmt->u.beacon), variable));
1596 * either beacon or probe_resp but the variable field is at the
1599 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1603 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1606 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1609 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1610 struct sk_buff *skb)
1612 struct ieee80211_rx_status *rx_status;
1613 struct ieee80211_mgmt *mgmt;
1615 struct ieee802_11_elems elems;
1618 rx_status = IEEE80211_SKB_RXCB(skb);
1619 mgmt = (struct ieee80211_mgmt *) skb->data;
1620 fc = le16_to_cpu(mgmt->frame_control);
1624 if (!sdata->u.ibss.ssid_len)
1625 goto mgmt_out; /* not ready to merge yet */
1627 switch (fc & IEEE80211_FCTL_STYPE) {
1628 case IEEE80211_STYPE_PROBE_REQ:
1629 ieee80211_rx_mgmt_probe_req(sdata, skb);
1631 case IEEE80211_STYPE_PROBE_RESP:
1632 case IEEE80211_STYPE_BEACON:
1633 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1636 case IEEE80211_STYPE_AUTH:
1637 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1639 case IEEE80211_STYPE_DEAUTH:
1640 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1642 case IEEE80211_STYPE_ACTION:
1643 switch (mgmt->u.action.category) {
1644 case WLAN_CATEGORY_SPECTRUM_MGMT:
1645 ies_len = skb->len -
1646 offsetof(struct ieee80211_mgmt,
1647 u.action.u.chan_switch.variable);
1652 ieee802_11_parse_elems(
1653 mgmt->u.action.u.chan_switch.variable,
1654 ies_len, true, &elems);
1656 if (elems.parse_error)
1659 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1666 sdata_unlock(sdata);
1669 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1671 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1672 struct sta_info *sta;
1677 * Work could be scheduled after scan or similar
1678 * when we aren't even joined (or trying) with a
1681 if (!ifibss->ssid_len)
1684 spin_lock_bh(&ifibss->incomplete_lock);
1685 while (!list_empty(&ifibss->incomplete_stations)) {
1686 sta = list_first_entry(&ifibss->incomplete_stations,
1687 struct sta_info, list);
1688 list_del(&sta->list);
1689 spin_unlock_bh(&ifibss->incomplete_lock);
1691 ieee80211_ibss_finish_sta(sta);
1693 spin_lock_bh(&ifibss->incomplete_lock);
1695 spin_unlock_bh(&ifibss->incomplete_lock);
1697 switch (ifibss->state) {
1698 case IEEE80211_IBSS_MLME_SEARCH:
1699 ieee80211_sta_find_ibss(sdata);
1701 case IEEE80211_IBSS_MLME_JOINED:
1702 ieee80211_sta_merge_ibss(sdata);
1710 sdata_unlock(sdata);
1713 static void ieee80211_ibss_timer(unsigned long data)
1715 struct ieee80211_sub_if_data *sdata =
1716 (struct ieee80211_sub_if_data *) data;
1718 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1721 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1723 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1725 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1726 (unsigned long) sdata);
1727 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1728 spin_lock_init(&ifibss->incomplete_lock);
1729 INIT_WORK(&ifibss->csa_connection_drop_work,
1730 ieee80211_csa_connection_drop_work);
1733 /* scan finished notification */
1734 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1736 struct ieee80211_sub_if_data *sdata;
1738 mutex_lock(&local->iflist_mtx);
1739 list_for_each_entry(sdata, &local->interfaces, list) {
1740 if (!ieee80211_sdata_running(sdata))
1742 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1744 sdata->u.ibss.last_scan_completed = jiffies;
1746 mutex_unlock(&local->iflist_mtx);
1749 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1750 struct cfg80211_ibss_params *params)
1754 struct ieee80211_supported_band *sband;
1755 enum ieee80211_chanctx_mode chanmode;
1756 struct ieee80211_local *local = sdata->local;
1757 int radar_detect_width = 0;
1761 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1763 sdata->wdev.iftype);
1768 if (!params->userspace_handles_dfs)
1770 radar_detect_width = BIT(params->chandef.width);
1773 chanmode = (params->channel_fixed && !ret) ?
1774 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1776 mutex_lock(&local->chanctx_mtx);
1777 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode,
1778 radar_detect_width);
1779 mutex_unlock(&local->chanctx_mtx);
1783 if (params->bssid) {
1784 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1785 sdata->u.ibss.fixed_bssid = true;
1787 sdata->u.ibss.fixed_bssid = false;
1789 sdata->u.ibss.privacy = params->privacy;
1790 sdata->u.ibss.control_port = params->control_port;
1791 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1792 sdata->u.ibss.basic_rates = params->basic_rates;
1793 sdata->u.ibss.last_scan_completed = jiffies;
1795 /* fix basic_rates if channel does not support these rates */
1796 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef);
1797 sband = local->hw.wiphy->bands[params->chandef.chan->band];
1798 for (i = 0; i < sband->n_bitrates; i++) {
1799 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1800 sdata->u.ibss.basic_rates &= ~BIT(i);
1802 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1803 sizeof(params->mcast_rate));
1805 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1807 sdata->u.ibss.chandef = params->chandef;
1808 sdata->u.ibss.fixed_channel = params->channel_fixed;
1811 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1813 if (sdata->u.ibss.ie)
1814 sdata->u.ibss.ie_len = params->ie_len;
1817 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1818 sdata->u.ibss.ibss_join_req = jiffies;
1820 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1821 sdata->u.ibss.ssid_len = params->ssid_len;
1823 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa,
1824 sizeof(sdata->u.ibss.ht_capa));
1825 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask,
1826 sizeof(sdata->u.ibss.ht_capa_mask));
1829 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1830 * reserved, but an HT STA shall protect HT transmissions as though
1831 * the HT Protection field were set to non-HT mixed mode.
1833 * In an IBSS, the RIFS Mode field of the HT Operation element is
1834 * also reserved, but an HT STA shall operate as though this field
1838 sdata->vif.bss_conf.ht_operation_mode |=
1839 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1840 | IEEE80211_HT_PARAM_RIFS_MODE;
1842 changed |= BSS_CHANGED_HT;
1843 ieee80211_bss_info_change_notify(sdata, changed);
1845 sdata->smps_mode = IEEE80211_SMPS_OFF;
1846 sdata->needed_rx_chains = local->rx_chains;
1848 ieee80211_queue_work(&local->hw, &sdata->work);
1853 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1855 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1857 ieee80211_ibss_disconnect(sdata);
1858 ifibss->ssid_len = 0;
1859 eth_zero_addr(ifibss->bssid);
1862 kfree(sdata->u.ibss.ie);
1863 sdata->u.ibss.ie = NULL;
1864 sdata->u.ibss.ie_len = 0;
1866 /* on the next join, re-program HT parameters */
1867 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1868 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1872 skb_queue_purge(&sdata->skb_queue);
1874 del_timer_sync(&sdata->u.ibss.timer);