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) 2018-2020 Intel Corporation
15 #include <linux/delay.h>
16 #include <linux/slab.h>
17 #include <linux/if_ether.h>
18 #include <linux/skbuff.h>
19 #include <linux/if_arp.h>
20 #include <linux/etherdevice.h>
21 #include <linux/rtnetlink.h>
22 #include <net/mac80211.h>
24 #include "ieee80211_i.h"
25 #include "driver-ops.h"
28 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
29 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
31 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
32 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
33 #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ)
35 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
37 static struct beacon_data *
38 ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata,
39 const int beacon_int, const u32 basic_rates,
40 const u16 capability, u64 tsf,
41 struct cfg80211_chan_def *chandef,
42 bool *have_higher_than_11mbit,
43 struct cfg80211_csa_settings *csa_settings)
45 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
46 struct ieee80211_local *local = sdata->local;
47 int rates_n = 0, i, ri;
48 struct ieee80211_mgmt *mgmt;
50 struct ieee80211_supported_band *sband;
51 u32 rate_flags, rates = 0, rates_added = 0;
52 struct beacon_data *presp;
56 /* Build IBSS probe response */
57 frame_len = sizeof(struct ieee80211_hdr_3addr) +
58 12 /* struct ieee80211_mgmt.u.beacon */ +
59 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
60 2 + 8 /* max Supported Rates */ +
61 3 /* max DS params */ +
63 5 /* Channel Switch Announcement */ +
64 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
65 2 + sizeof(struct ieee80211_ht_cap) +
66 2 + sizeof(struct ieee80211_ht_operation) +
67 2 + sizeof(struct ieee80211_vht_cap) +
68 2 + sizeof(struct ieee80211_vht_operation) +
70 presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
74 presp->head = (void *)(presp + 1);
76 mgmt = (void *) presp->head;
77 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
78 IEEE80211_STYPE_PROBE_RESP);
79 eth_broadcast_addr(mgmt->da);
80 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
81 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
82 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
83 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
84 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
86 pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
88 *pos++ = WLAN_EID_SSID;
89 *pos++ = ifibss->ssid_len;
90 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
91 pos += ifibss->ssid_len;
93 sband = local->hw.wiphy->bands[chandef->chan->band];
94 rate_flags = ieee80211_chandef_rate_flags(chandef);
95 shift = ieee80211_chandef_get_shift(chandef);
97 if (have_higher_than_11mbit)
98 *have_higher_than_11mbit = false;
100 for (i = 0; i < sband->n_bitrates; i++) {
101 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
103 if (sband->bitrates[i].bitrate > 110 &&
104 have_higher_than_11mbit)
105 *have_higher_than_11mbit = true;
111 *pos++ = WLAN_EID_SUPP_RATES;
112 *pos++ = min_t(int, 8, rates_n);
113 for (ri = 0; ri < sband->n_bitrates; ri++) {
114 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
117 if (!(rates & BIT(ri)))
120 if (basic_rates & BIT(ri))
122 *pos++ = basic | (u8) rate;
123 if (++rates_added == 8) {
124 ri++; /* continue at next rate for EXT_SUPP_RATES */
129 if (sband->band == NL80211_BAND_2GHZ) {
130 *pos++ = WLAN_EID_DS_PARAMS;
132 *pos++ = ieee80211_frequency_to_channel(
133 chandef->chan->center_freq);
136 *pos++ = WLAN_EID_IBSS_PARAMS;
138 /* FIX: set ATIM window based on scan results */
143 *pos++ = WLAN_EID_CHANNEL_SWITCH;
145 *pos++ = csa_settings->block_tx ? 1 : 0;
146 *pos++ = ieee80211_frequency_to_channel(
147 csa_settings->chandef.chan->center_freq);
148 presp->cntdwn_counter_offsets[0] = (pos - presp->head);
149 *pos++ = csa_settings->count;
150 presp->cntdwn_current_counter = csa_settings->count;
153 /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
155 *pos++ = WLAN_EID_EXT_SUPP_RATES;
156 *pos++ = rates_n - 8;
157 for (; ri < sband->n_bitrates; ri++) {
158 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
161 if (!(rates & BIT(ri)))
164 if (basic_rates & BIT(ri))
166 *pos++ = basic | (u8) rate;
170 if (ifibss->ie_len) {
171 memcpy(pos, ifibss->ie, ifibss->ie_len);
172 pos += ifibss->ie_len;
175 /* add HT capability and information IEs */
176 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
177 chandef->width != NL80211_CHAN_WIDTH_5 &&
178 chandef->width != NL80211_CHAN_WIDTH_10 &&
179 sband->ht_cap.ht_supported) {
180 struct ieee80211_sta_ht_cap ht_cap;
182 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
183 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
185 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
187 * Note: According to 802.11n-2009 9.13.3.1, HT Protection
188 * field and RIFS Mode are reserved in IBSS mode, therefore
191 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
194 /* add VHT capability and information IEs */
195 if (chandef->width != NL80211_CHAN_WIDTH_20 &&
196 chandef->width != NL80211_CHAN_WIDTH_40 &&
197 sband->vht_cap.vht_supported) {
198 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
200 pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap,
205 if (local->hw.queues >= IEEE80211_NUM_ACS)
206 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */
208 presp->head_len = pos - presp->head;
209 if (WARN_ON(presp->head_len > frame_len))
218 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
219 const u8 *bssid, const int beacon_int,
220 struct cfg80211_chan_def *req_chandef,
221 const u32 basic_rates,
222 const u16 capability, u64 tsf,
225 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
226 struct ieee80211_local *local = sdata->local;
227 struct ieee80211_mgmt *mgmt;
228 struct cfg80211_bss *bss;
230 struct cfg80211_chan_def chandef;
231 struct ieee80211_channel *chan;
232 struct beacon_data *presp;
233 struct cfg80211_inform_bss bss_meta = {};
234 bool have_higher_than_11mbit;
238 sdata_assert_lock(sdata);
240 /* Reset own TSF to allow time synchronization work. */
241 drv_reset_tsf(local, sdata);
243 if (!ether_addr_equal(ifibss->bssid, bssid))
244 sta_info_flush(sdata);
246 /* if merging, indicate to driver that we leave the old IBSS */
247 if (sdata->vif.bss_conf.ibss_joined) {
248 sdata->vif.bss_conf.ibss_joined = false;
249 sdata->vif.bss_conf.ibss_creator = false;
250 sdata->vif.bss_conf.enable_beacon = false;
251 netif_carrier_off(sdata->dev);
252 ieee80211_bss_info_change_notify(sdata,
254 BSS_CHANGED_BEACON_ENABLED);
255 drv_leave_ibss(local, sdata);
258 presp = rcu_dereference_protected(ifibss->presp,
259 lockdep_is_held(&sdata->wdev.mtx));
260 RCU_INIT_POINTER(ifibss->presp, NULL);
262 kfree_rcu(presp, rcu_head);
264 /* make a copy of the chandef, it could be modified below. */
265 chandef = *req_chandef;
267 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
268 NL80211_IFTYPE_ADHOC)) {
269 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
270 chandef.width == NL80211_CHAN_WIDTH_10 ||
271 chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
272 chandef.width == NL80211_CHAN_WIDTH_20) {
274 "Failed to join IBSS, beacons forbidden\n");
277 chandef.width = NL80211_CHAN_WIDTH_20;
278 chandef.center_freq1 = chan->center_freq;
279 /* check again for downgraded chandef */
280 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
281 NL80211_IFTYPE_ADHOC)) {
283 "Failed to join IBSS, beacons forbidden\n");
288 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
289 &chandef, NL80211_IFTYPE_ADHOC);
292 "Failed to join IBSS, invalid chandef\n");
295 if (err > 0 && !ifibss->userspace_handles_dfs) {
297 "Failed to join IBSS, DFS channel without control program\n");
301 radar_required = err;
303 mutex_lock(&local->mtx);
304 if (ieee80211_vif_use_channel(sdata, &chandef,
305 ifibss->fixed_channel ?
306 IEEE80211_CHANCTX_SHARED :
307 IEEE80211_CHANCTX_EXCLUSIVE)) {
308 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
309 mutex_unlock(&local->mtx);
312 sdata->radar_required = radar_required;
313 mutex_unlock(&local->mtx);
315 memcpy(ifibss->bssid, bssid, ETH_ALEN);
317 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
318 capability, tsf, &chandef,
319 &have_higher_than_11mbit, NULL);
323 rcu_assign_pointer(ifibss->presp, presp);
324 mgmt = (void *)presp->head;
326 sdata->vif.bss_conf.enable_beacon = true;
327 sdata->vif.bss_conf.beacon_int = beacon_int;
328 sdata->vif.bss_conf.basic_rates = basic_rates;
329 sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
330 memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
331 bss_change = BSS_CHANGED_BEACON_INT;
332 bss_change |= ieee80211_reset_erp_info(sdata);
333 bss_change |= BSS_CHANGED_BSSID;
334 bss_change |= BSS_CHANGED_BEACON;
335 bss_change |= BSS_CHANGED_BEACON_ENABLED;
336 bss_change |= BSS_CHANGED_BASIC_RATES;
337 bss_change |= BSS_CHANGED_HT;
338 bss_change |= BSS_CHANGED_IBSS;
339 bss_change |= BSS_CHANGED_SSID;
342 * In 5 GHz/802.11a, we can always use short slot time.
343 * (IEEE 802.11-2012 18.3.8.7)
345 * In 2.4GHz, we must always use long slots in IBSS for compatibility
347 * (IEEE 802.11-2012 19.4.5)
349 * HT follows these specifications (IEEE 802.11-2012 20.3.18)
351 sdata->vif.bss_conf.use_short_slot = chan->band == NL80211_BAND_5GHZ;
352 bss_change |= BSS_CHANGED_ERP_SLOT;
354 /* cf. IEEE 802.11 9.2.12 */
355 if (chan->band == NL80211_BAND_2GHZ && have_higher_than_11mbit)
356 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
358 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
360 ieee80211_set_wmm_default(sdata, true, false);
362 sdata->vif.bss_conf.ibss_joined = true;
363 sdata->vif.bss_conf.ibss_creator = creator;
365 err = drv_join_ibss(local, sdata);
367 sdata->vif.bss_conf.ibss_joined = false;
368 sdata->vif.bss_conf.ibss_creator = false;
369 sdata->vif.bss_conf.enable_beacon = false;
370 sdata->vif.bss_conf.ssid_len = 0;
371 RCU_INIT_POINTER(ifibss->presp, NULL);
372 kfree_rcu(presp, rcu_head);
373 mutex_lock(&local->mtx);
374 ieee80211_vif_release_channel(sdata);
375 mutex_unlock(&local->mtx);
376 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
381 ieee80211_bss_info_change_notify(sdata, bss_change);
383 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
384 mod_timer(&ifibss->timer,
385 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
387 bss_meta.chan = chan;
388 bss_meta.scan_width = cfg80211_chandef_to_scan_width(&chandef);
389 bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt,
390 presp->head_len, GFP_KERNEL);
392 cfg80211_put_bss(local->hw.wiphy, bss);
393 netif_carrier_on(sdata->dev);
394 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
397 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
398 struct ieee80211_bss *bss)
400 struct cfg80211_bss *cbss =
401 container_of((void *)bss, struct cfg80211_bss, priv);
402 struct ieee80211_supported_band *sband;
403 struct cfg80211_chan_def chandef;
406 u16 beacon_int = cbss->beacon_interval;
407 const struct cfg80211_bss_ies *ies;
408 enum nl80211_channel_type chan_type;
413 sdata_assert_lock(sdata);
418 switch (sdata->u.ibss.chandef.width) {
419 case NL80211_CHAN_WIDTH_20_NOHT:
420 case NL80211_CHAN_WIDTH_20:
421 case NL80211_CHAN_WIDTH_40:
422 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
423 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
425 case NL80211_CHAN_WIDTH_5:
426 case NL80211_CHAN_WIDTH_10:
427 cfg80211_chandef_create(&chandef, cbss->channel,
429 chandef.width = sdata->u.ibss.chandef.width;
431 case NL80211_CHAN_WIDTH_80:
432 case NL80211_CHAN_WIDTH_80P80:
433 case NL80211_CHAN_WIDTH_160:
434 chandef = sdata->u.ibss.chandef;
435 chandef.chan = cbss->channel;
438 /* fall back to 20 MHz for unsupported modes */
439 cfg80211_chandef_create(&chandef, cbss->channel,
444 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
445 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
446 shift = ieee80211_vif_get_shift(&sdata->vif);
450 for (i = 0; i < bss->supp_rates_len; i++) {
451 int rate = bss->supp_rates[i] & 0x7f;
452 bool is_basic = !!(bss->supp_rates[i] & 0x80);
454 for (j = 0; j < sband->n_bitrates; j++) {
456 if ((rate_flags & sband->bitrates[j].flags)
460 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
464 basic_rates |= BIT(j);
471 ies = rcu_dereference(cbss->ies);
475 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
483 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
484 struct cfg80211_csa_settings *csa_settings)
486 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
487 struct beacon_data *presp, *old_presp;
488 struct cfg80211_bss *cbss;
489 const struct cfg80211_bss_ies *ies;
490 u16 capability = WLAN_CAPABILITY_IBSS;
494 sdata_assert_lock(sdata);
497 capability |= WLAN_CAPABILITY_PRIVACY;
499 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
500 ifibss->bssid, ifibss->ssid,
501 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS,
502 IEEE80211_PRIVACY(ifibss->privacy));
504 if (WARN_ON(!cbss)) {
510 ies = rcu_dereference(cbss->ies);
513 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
515 old_presp = rcu_dereference_protected(ifibss->presp,
516 lockdep_is_held(&sdata->wdev.mtx));
518 presp = ieee80211_ibss_build_presp(sdata,
519 sdata->vif.bss_conf.beacon_int,
520 sdata->vif.bss_conf.basic_rates,
521 capability, tsf, &ifibss->chandef,
528 rcu_assign_pointer(ifibss->presp, presp);
530 kfree_rcu(old_presp, rcu_head);
532 return BSS_CHANGED_BEACON;
537 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
539 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
540 struct cfg80211_bss *cbss;
542 sdata_assert_lock(sdata);
544 /* When not connected/joined, sending CSA doesn't make sense. */
545 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED)
548 /* update cfg80211 bss information with the new channel */
549 if (!is_zero_ether_addr(ifibss->bssid)) {
550 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
551 ifibss->chandef.chan,
552 ifibss->bssid, ifibss->ssid,
554 IEEE80211_BSS_TYPE_IBSS,
555 IEEE80211_PRIVACY(ifibss->privacy));
556 /* XXX: should not really modify cfg80211 data */
558 cbss->channel = sdata->csa_chandef.chan;
559 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
563 ifibss->chandef = sdata->csa_chandef;
565 /* generate the beacon */
566 return ieee80211_ibss_csa_beacon(sdata, NULL);
569 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
571 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
573 cancel_work_sync(&ifibss->csa_connection_drop_work);
576 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
579 struct ieee80211_sub_if_data *sdata = sta->sdata;
582 memcpy(addr, sta->sta.addr, ETH_ALEN);
584 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
586 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
587 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
588 /* authorize the station only if the network is not RSN protected. If
589 * not wait for the userspace to authorize it */
590 if (!sta->sdata->u.ibss.control_port)
591 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
593 rate_control_rate_init(sta);
595 /* If it fails, maybe we raced another insertion? */
596 if (sta_info_insert_rcu(sta))
597 return sta_info_get(sdata, addr);
601 static struct sta_info *
602 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
603 const u8 *addr, u32 supp_rates)
606 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
607 struct ieee80211_local *local = sdata->local;
608 struct sta_info *sta;
609 struct ieee80211_chanctx_conf *chanctx_conf;
610 struct ieee80211_supported_band *sband;
611 enum nl80211_bss_scan_width scan_width;
615 * XXX: Consider removing the least recently used entry and
616 * allow new one to be added.
618 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
619 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
625 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
630 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
636 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
637 if (WARN_ON_ONCE(!chanctx_conf))
639 band = chanctx_conf->def.chan->band;
640 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
643 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
649 /* make sure mandatory rates are always added */
650 sband = local->hw.wiphy->bands[band];
651 sta->sta.supp_rates[band] = supp_rates |
652 ieee80211_mandatory_rates(sband, scan_width);
654 return ieee80211_ibss_finish_sta(sta);
657 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
659 struct ieee80211_local *local = sdata->local;
661 struct sta_info *sta;
663 sdata_assert_lock(sdata);
667 list_for_each_entry_rcu(sta, &local->sta_list, list) {
668 unsigned long last_active = ieee80211_sta_last_active(sta);
670 if (sta->sdata == sdata &&
671 time_is_after_jiffies(last_active +
672 IEEE80211_IBSS_MERGE_INTERVAL)) {
683 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
685 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
686 struct ieee80211_local *local = sdata->local;
687 struct cfg80211_bss *cbss;
688 struct beacon_data *presp;
689 struct sta_info *sta;
691 if (!is_zero_ether_addr(ifibss->bssid)) {
692 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
693 ifibss->bssid, ifibss->ssid,
695 IEEE80211_BSS_TYPE_IBSS,
696 IEEE80211_PRIVACY(ifibss->privacy));
699 cfg80211_unlink_bss(local->hw.wiphy, cbss);
700 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
704 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
706 sta_info_flush(sdata);
708 spin_lock_bh(&ifibss->incomplete_lock);
709 while (!list_empty(&ifibss->incomplete_stations)) {
710 sta = list_first_entry(&ifibss->incomplete_stations,
711 struct sta_info, list);
712 list_del(&sta->list);
713 spin_unlock_bh(&ifibss->incomplete_lock);
715 sta_info_free(local, sta);
716 spin_lock_bh(&ifibss->incomplete_lock);
718 spin_unlock_bh(&ifibss->incomplete_lock);
720 netif_carrier_off(sdata->dev);
722 sdata->vif.bss_conf.ibss_joined = false;
723 sdata->vif.bss_conf.ibss_creator = false;
724 sdata->vif.bss_conf.enable_beacon = false;
725 sdata->vif.bss_conf.ssid_len = 0;
728 presp = rcu_dereference_protected(ifibss->presp,
729 lockdep_is_held(&sdata->wdev.mtx));
730 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
732 kfree_rcu(presp, rcu_head);
734 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
735 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
737 drv_leave_ibss(local, sdata);
738 mutex_lock(&local->mtx);
739 ieee80211_vif_release_channel(sdata);
740 mutex_unlock(&local->mtx);
743 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
745 struct ieee80211_sub_if_data *sdata =
746 container_of(work, struct ieee80211_sub_if_data,
747 u.ibss.csa_connection_drop_work);
751 ieee80211_ibss_disconnect(sdata);
753 skb_queue_purge(&sdata->skb_queue);
755 /* trigger a scan to find another IBSS network to join */
756 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
761 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
763 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
766 /* if the current channel is a DFS channel, mark the channel as
769 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
771 NL80211_IFTYPE_ADHOC);
773 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
778 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
779 struct ieee802_11_elems *elems,
782 struct cfg80211_csa_settings params;
783 struct ieee80211_csa_ie csa_ie;
784 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
785 enum nl80211_channel_type ch_type;
788 u32 vht_cap_info = 0;
790 sdata_assert_lock(sdata);
792 sta_flags = IEEE80211_STA_DISABLE_VHT;
793 switch (ifibss->chandef.width) {
794 case NL80211_CHAN_WIDTH_5:
795 case NL80211_CHAN_WIDTH_10:
796 case NL80211_CHAN_WIDTH_20_NOHT:
797 sta_flags |= IEEE80211_STA_DISABLE_HT;
799 case NL80211_CHAN_WIDTH_20:
800 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
806 if (elems->vht_cap_elem)
807 vht_cap_info = le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
809 memset(¶ms, 0, sizeof(params));
810 err = ieee80211_parse_ch_switch_ie(sdata, elems,
811 ifibss->chandef.chan->band,
813 sta_flags, ifibss->bssid, &csa_ie);
814 /* can't switch to destination channel, fail */
818 /* did not contain a CSA */
822 /* channel switch is not supported, disconnect */
823 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
826 params.count = csa_ie.count;
827 params.chandef = csa_ie.chandef;
829 switch (ifibss->chandef.width) {
830 case NL80211_CHAN_WIDTH_20_NOHT:
831 case NL80211_CHAN_WIDTH_20:
832 case NL80211_CHAN_WIDTH_40:
833 /* keep our current HT mode (HT20/HT40+/HT40-), even if
834 * another mode has been announced. The mode is not adopted
835 * within the beacon while doing CSA and we should therefore
836 * keep the mode which we announce.
838 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
839 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan,
842 case NL80211_CHAN_WIDTH_5:
843 case NL80211_CHAN_WIDTH_10:
844 if (params.chandef.width != ifibss->chandef.width) {
846 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
848 params.chandef.chan->center_freq,
849 params.chandef.width,
850 params.chandef.center_freq1,
851 params.chandef.center_freq2);
856 /* should not happen, sta_flags should prevent VHT modes. */
861 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef,
862 NL80211_IFTYPE_ADHOC)) {
864 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
866 params.chandef.chan->center_freq,
867 params.chandef.width,
868 params.chandef.center_freq1,
869 params.chandef.center_freq2);
873 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
875 NL80211_IFTYPE_ADHOC);
878 if (err > 0 && !ifibss->userspace_handles_dfs) {
879 /* IBSS-DFS only allowed with a control program */
883 params.radar_required = err;
885 if (cfg80211_chandef_identical(¶ms.chandef,
886 &sdata->vif.bss_conf.chandef)) {
888 "received csa with an identical chandef, ignoring\n");
892 /* all checks done, now perform the channel switch. */
894 "received channel switch announcement to go to channel %d MHz\n",
895 params.chandef.chan->center_freq);
897 params.block_tx = !!csa_ie.mode;
899 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
903 ieee80211_ibss_csa_mark_radar(sdata);
907 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
908 ieee80211_queue_work(&sdata->local->hw,
909 &ifibss->csa_connection_drop_work);
911 ieee80211_ibss_csa_mark_radar(sdata);
917 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
918 struct ieee80211_mgmt *mgmt, size_t len,
919 struct ieee80211_rx_status *rx_status,
920 struct ieee802_11_elems *elems)
924 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
927 /* CSA is the only action we handle for now */
928 if (mgmt->u.action.u.measurement.action_code !=
929 WLAN_ACTION_SPCT_CHL_SWITCH)
932 required_len = IEEE80211_MIN_ACTION_SIZE +
933 sizeof(mgmt->u.action.u.chan_switch);
934 if (len < required_len)
937 if (!sdata->vif.csa_active)
938 ieee80211_ibss_process_chanswitch(sdata, elems, false);
941 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
942 struct ieee80211_mgmt *mgmt,
945 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
947 if (len < IEEE80211_DEAUTH_FRAME_LEN)
950 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
951 ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason);
952 sta_info_destroy_addr(sdata, mgmt->sa);
955 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
956 struct ieee80211_mgmt *mgmt,
959 u16 auth_alg, auth_transaction;
961 sdata_assert_lock(sdata);
966 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
967 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
969 ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
970 ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n",
971 mgmt->bssid, auth_transaction);
973 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
977 * IEEE 802.11 standard does not require authentication in IBSS
978 * networks and most implementations do not seem to use it.
979 * However, try to reply to authentication attempts if someone
980 * has actually implemented this.
982 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
983 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
986 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
987 struct ieee80211_mgmt *mgmt, size_t len,
988 struct ieee80211_rx_status *rx_status,
989 struct ieee802_11_elems *elems,
990 struct ieee80211_channel *channel)
992 struct sta_info *sta;
993 enum nl80211_band band = rx_status->band;
994 enum nl80211_bss_scan_width scan_width;
995 struct ieee80211_local *local = sdata->local;
996 struct ieee80211_supported_band *sband;
997 bool rates_updated = false;
1000 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1003 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
1006 sband = local->hw.wiphy->bands[band];
1007 if (WARN_ON(!sband))
1011 sta = sta_info_get(sdata, mgmt->sa);
1013 if (elems->supp_rates) {
1014 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1019 prev_rates = sta->sta.supp_rates[band];
1020 /* make sure mandatory rates are always added */
1021 scan_width = NL80211_BSS_CHAN_WIDTH_20;
1022 if (rx_status->bw == RATE_INFO_BW_5)
1023 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1024 else if (rx_status->bw == RATE_INFO_BW_10)
1025 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1027 sta->sta.supp_rates[band] = supp_rates |
1028 ieee80211_mandatory_rates(sband, scan_width);
1029 if (sta->sta.supp_rates[band] != prev_rates) {
1031 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1032 sta->sta.addr, prev_rates,
1033 sta->sta.supp_rates[band]);
1034 rates_updated = true;
1038 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1039 mgmt->sa, supp_rates);
1043 if (sta && !sta->sta.wme &&
1044 (elems->wmm_info || elems->s1g_capab) &&
1045 local->hw.queues >= IEEE80211_NUM_ACS) {
1046 sta->sta.wme = true;
1047 ieee80211_check_fast_xmit(sta);
1050 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1051 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1052 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1053 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1054 /* we both use HT */
1055 struct ieee80211_ht_cap htcap_ie;
1056 struct cfg80211_chan_def chandef;
1057 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
1059 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT);
1060 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef);
1062 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1063 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1067 if (elems->vht_operation && elems->vht_cap_elem &&
1068 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1069 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1070 /* we both use VHT */
1071 struct ieee80211_vht_cap cap_ie;
1072 struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap;
1074 le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
1076 ieee80211_chandef_vht_oper(&local->hw, vht_cap_info,
1077 elems->vht_operation,
1078 elems->ht_operation,
1080 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1081 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1083 if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap)))
1084 rates_updated |= true;
1087 if (bw != sta->sta.bandwidth)
1088 rates_updated |= true;
1090 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1095 if (sta && rates_updated) {
1096 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1097 u8 rx_nss = sta->sta.rx_nss;
1099 /* Force rx_nss recalculation */
1100 sta->sta.rx_nss = 0;
1101 rate_control_rate_init(sta);
1102 if (sta->sta.rx_nss != rx_nss)
1103 changed |= IEEE80211_RC_NSS_CHANGED;
1105 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1111 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1112 struct ieee80211_mgmt *mgmt, size_t len,
1113 struct ieee80211_rx_status *rx_status,
1114 struct ieee802_11_elems *elems)
1116 struct ieee80211_local *local = sdata->local;
1117 struct cfg80211_bss *cbss;
1118 struct ieee80211_bss *bss;
1119 struct ieee80211_channel *channel;
1120 u64 beacon_timestamp, rx_timestamp;
1122 enum nl80211_band band = rx_status->band;
1124 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1128 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1130 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel);
1134 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1136 /* same for beacon and probe response */
1137 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1139 /* check if we need to merge IBSS */
1142 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1145 /* different channel */
1146 if (sdata->u.ibss.fixed_channel &&
1147 sdata->u.ibss.chandef.chan != cbss->channel)
1150 /* different SSID */
1151 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1152 memcmp(elems->ssid, sdata->u.ibss.ssid,
1153 sdata->u.ibss.ssid_len))
1156 /* process channel switch */
1157 if (sdata->vif.csa_active ||
1158 ieee80211_ibss_process_chanswitch(sdata, elems, true))
1162 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1165 /* we use a fixed BSSID */
1166 if (sdata->u.ibss.fixed_bssid)
1169 if (ieee80211_have_rx_timestamp(rx_status)) {
1170 /* time when timestamp field was received */
1172 ieee80211_calculate_rx_timestamp(local, rx_status,
1176 * second best option: get current TSF
1177 * (will return -1 if not supported)
1179 rx_timestamp = drv_get_tsf(local, sdata);
1182 ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n",
1183 mgmt->sa, mgmt->bssid,
1184 (unsigned long long)rx_timestamp);
1185 ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n",
1186 (unsigned long long)beacon_timestamp,
1187 (unsigned long long)(rx_timestamp - beacon_timestamp),
1190 if (beacon_timestamp > rx_timestamp) {
1192 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1194 ieee80211_sta_join_ibss(sdata, bss);
1195 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1196 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1202 ieee80211_rx_bss_put(local, bss);
1205 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1206 const u8 *bssid, const u8 *addr,
1209 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1210 struct ieee80211_local *local = sdata->local;
1211 struct sta_info *sta;
1212 struct ieee80211_chanctx_conf *chanctx_conf;
1213 struct ieee80211_supported_band *sband;
1214 enum nl80211_bss_scan_width scan_width;
1218 * XXX: Consider removing the least recently used entry and
1219 * allow new one to be added.
1221 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1222 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1227 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1230 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1234 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1235 if (WARN_ON_ONCE(!chanctx_conf)) {
1239 band = chanctx_conf->def.chan->band;
1240 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1243 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1247 /* make sure mandatory rates are always added */
1248 sband = local->hw.wiphy->bands[band];
1249 sta->sta.supp_rates[band] = supp_rates |
1250 ieee80211_mandatory_rates(sband, scan_width);
1252 spin_lock(&ifibss->incomplete_lock);
1253 list_add(&sta->list, &ifibss->incomplete_stations);
1254 spin_unlock(&ifibss->incomplete_lock);
1255 ieee80211_queue_work(&local->hw, &sdata->work);
1258 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1260 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1261 struct ieee80211_local *local = sdata->local;
1262 struct sta_info *sta, *tmp;
1263 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1264 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1266 mutex_lock(&local->sta_mtx);
1268 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1269 unsigned long last_active = ieee80211_sta_last_active(sta);
1271 if (sdata != sta->sdata)
1274 if (time_is_before_jiffies(last_active + exp_time) ||
1275 (time_is_before_jiffies(last_active + exp_rsn) &&
1276 sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1277 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
1279 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1280 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1281 "not authorized " : "", sta->sta.addr);
1283 ieee80211_send_deauth_disassoc(sdata, sta->sta.addr,
1285 IEEE80211_STYPE_DEAUTH,
1286 WLAN_REASON_DEAUTH_LEAVING,
1288 WARN_ON(__sta_info_destroy(sta));
1292 mutex_unlock(&local->sta_mtx);
1296 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1299 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1301 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1302 enum nl80211_bss_scan_width scan_width;
1304 sdata_assert_lock(sdata);
1306 mod_timer(&ifibss->timer,
1307 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1309 ieee80211_ibss_sta_expire(sdata);
1311 if (time_before(jiffies, ifibss->last_scan_completed +
1312 IEEE80211_IBSS_MERGE_INTERVAL))
1315 if (ieee80211_sta_active_ibss(sdata))
1318 if (ifibss->fixed_channel)
1322 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1324 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1325 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1326 NULL, 0, scan_width);
1329 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1331 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1336 sdata_assert_lock(sdata);
1338 if (ifibss->fixed_bssid) {
1339 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1341 /* Generate random, not broadcast, locally administered BSSID. Mix in
1342 * own MAC address to make sure that devices that do not have proper
1343 * random number generator get different BSSID. */
1344 get_random_bytes(bssid, ETH_ALEN);
1345 for (i = 0; i < ETH_ALEN; i++)
1346 bssid[i] ^= sdata->vif.addr[i];
1351 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1353 capability = WLAN_CAPABILITY_IBSS;
1355 if (ifibss->privacy)
1356 capability |= WLAN_CAPABILITY_PRIVACY;
1358 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1359 &ifibss->chandef, ifibss->basic_rates,
1360 capability, 0, true);
1363 static unsigned ibss_setup_channels(struct wiphy *wiphy,
1364 struct ieee80211_channel **channels,
1365 unsigned int channels_max,
1366 u32 center_freq, u32 width)
1368 struct ieee80211_channel *chan = NULL;
1369 unsigned int n_chan = 0;
1370 u32 start_freq, end_freq, freq;
1373 start_freq = center_freq;
1374 end_freq = center_freq;
1376 start_freq = center_freq - width / 2 + 10;
1377 end_freq = center_freq + width / 2 - 10;
1380 for (freq = start_freq; freq <= end_freq; freq += 20) {
1381 chan = ieee80211_get_channel(wiphy, freq);
1384 if (n_chan >= channels_max)
1387 channels[n_chan] = chan;
1395 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1396 const struct cfg80211_chan_def *chandef,
1397 struct ieee80211_channel **channels,
1398 unsigned int channels_max)
1400 unsigned int n_chan = 0;
1401 u32 width, cf1, cf2 = 0;
1403 switch (chandef->width) {
1404 case NL80211_CHAN_WIDTH_40:
1407 case NL80211_CHAN_WIDTH_80P80:
1408 cf2 = chandef->center_freq2;
1410 case NL80211_CHAN_WIDTH_80:
1413 case NL80211_CHAN_WIDTH_160:
1421 cf1 = chandef->center_freq1;
1423 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1426 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1427 channels_max - n_chan, cf2,
1434 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1437 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1439 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1440 struct ieee80211_local *local = sdata->local;
1441 struct cfg80211_bss *cbss;
1442 struct ieee80211_channel *chan = NULL;
1443 const u8 *bssid = NULL;
1444 enum nl80211_bss_scan_width scan_width;
1447 sdata_assert_lock(sdata);
1449 active_ibss = ieee80211_sta_active_ibss(sdata);
1450 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1455 if (ifibss->fixed_bssid)
1456 bssid = ifibss->bssid;
1457 if (ifibss->fixed_channel)
1458 chan = ifibss->chandef.chan;
1459 if (!is_zero_ether_addr(ifibss->bssid))
1460 bssid = ifibss->bssid;
1461 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1462 ifibss->ssid, ifibss->ssid_len,
1463 IEEE80211_BSS_TYPE_IBSS,
1464 IEEE80211_PRIVACY(ifibss->privacy));
1467 struct ieee80211_bss *bss;
1469 bss = (void *)cbss->priv;
1471 "sta_find_ibss: selected %pM current %pM\n",
1472 cbss->bssid, ifibss->bssid);
1474 "Selected IBSS BSSID %pM based on configured SSID\n",
1477 ieee80211_sta_join_ibss(sdata, bss);
1478 ieee80211_rx_bss_put(local, bss);
1482 /* if a fixed bssid and a fixed freq have been provided create the IBSS
1483 * directly and do not waste time scanning
1485 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1486 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1488 ieee80211_sta_create_ibss(sdata);
1493 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1495 /* Selected IBSS not found in current scan results - try to scan */
1496 if (time_after(jiffies, ifibss->last_scan_completed +
1497 IEEE80211_SCAN_INTERVAL)) {
1498 struct ieee80211_channel *channels[8];
1501 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1503 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1505 if (ifibss->fixed_channel) {
1506 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1509 ARRAY_SIZE(channels));
1510 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1511 ifibss->ssid_len, channels,
1514 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1515 ifibss->ssid_len, NULL,
1519 int interval = IEEE80211_SCAN_INTERVAL;
1521 if (time_after(jiffies, ifibss->ibss_join_req +
1522 IEEE80211_IBSS_JOIN_TIMEOUT))
1523 ieee80211_sta_create_ibss(sdata);
1525 mod_timer(&ifibss->timer,
1526 round_jiffies(jiffies + interval));
1530 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1531 struct sk_buff *req)
1533 struct ieee80211_mgmt *mgmt = (void *)req->data;
1534 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1535 struct ieee80211_local *local = sdata->local;
1536 int tx_last_beacon, len = req->len;
1537 struct sk_buff *skb;
1538 struct beacon_data *presp;
1541 sdata_assert_lock(sdata);
1543 presp = rcu_dereference_protected(ifibss->presp,
1544 lockdep_is_held(&sdata->wdev.mtx));
1546 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1547 len < 24 + 2 || !presp)
1550 tx_last_beacon = drv_tx_last_beacon(local);
1552 ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
1553 ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n",
1554 mgmt->bssid, tx_last_beacon);
1556 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1559 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1560 !is_broadcast_ether_addr(mgmt->bssid))
1563 end = ((u8 *) mgmt) + len;
1564 pos = mgmt->u.probe_req.variable;
1565 if (pos[0] != WLAN_EID_SSID ||
1566 pos + 2 + pos[1] > end) {
1567 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1572 (pos[1] != ifibss->ssid_len ||
1573 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1574 /* Ignore ProbeReq for foreign SSID */
1578 /* Reply with ProbeResp */
1579 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1583 skb_reserve(skb, local->tx_headroom);
1584 skb_put_data(skb, presp->head, presp->head_len);
1586 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1587 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1588 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1590 /* avoid excessive retries for probe request to wildcard SSIDs */
1592 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1594 ieee80211_tx_skb(sdata, skb);
1598 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1599 struct ieee80211_mgmt *mgmt, size_t len,
1600 struct ieee80211_rx_status *rx_status)
1603 struct ieee802_11_elems elems;
1605 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1606 offsetof(typeof(mgmt->u.beacon), variable));
1609 * either beacon or probe_resp but the variable field is at the
1612 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1616 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1617 false, &elems, mgmt->bssid, NULL);
1619 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1622 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1623 struct sk_buff *skb)
1625 struct ieee80211_rx_status *rx_status;
1626 struct ieee80211_mgmt *mgmt;
1628 struct ieee802_11_elems elems;
1631 rx_status = IEEE80211_SKB_RXCB(skb);
1632 mgmt = (struct ieee80211_mgmt *) skb->data;
1633 fc = le16_to_cpu(mgmt->frame_control);
1637 if (!sdata->u.ibss.ssid_len)
1638 goto mgmt_out; /* not ready to merge yet */
1640 switch (fc & IEEE80211_FCTL_STYPE) {
1641 case IEEE80211_STYPE_PROBE_REQ:
1642 ieee80211_rx_mgmt_probe_req(sdata, skb);
1644 case IEEE80211_STYPE_PROBE_RESP:
1645 case IEEE80211_STYPE_BEACON:
1646 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1649 case IEEE80211_STYPE_AUTH:
1650 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1652 case IEEE80211_STYPE_DEAUTH:
1653 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1655 case IEEE80211_STYPE_ACTION:
1656 switch (mgmt->u.action.category) {
1657 case WLAN_CATEGORY_SPECTRUM_MGMT:
1658 ies_len = skb->len -
1659 offsetof(struct ieee80211_mgmt,
1660 u.action.u.chan_switch.variable);
1665 ieee802_11_parse_elems(
1666 mgmt->u.action.u.chan_switch.variable,
1667 ies_len, true, &elems, mgmt->bssid, NULL);
1669 if (elems.parse_error)
1672 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1679 sdata_unlock(sdata);
1682 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1684 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1685 struct sta_info *sta;
1690 * Work could be scheduled after scan or similar
1691 * when we aren't even joined (or trying) with a
1694 if (!ifibss->ssid_len)
1697 spin_lock_bh(&ifibss->incomplete_lock);
1698 while (!list_empty(&ifibss->incomplete_stations)) {
1699 sta = list_first_entry(&ifibss->incomplete_stations,
1700 struct sta_info, list);
1701 list_del(&sta->list);
1702 spin_unlock_bh(&ifibss->incomplete_lock);
1704 ieee80211_ibss_finish_sta(sta);
1706 spin_lock_bh(&ifibss->incomplete_lock);
1708 spin_unlock_bh(&ifibss->incomplete_lock);
1710 switch (ifibss->state) {
1711 case IEEE80211_IBSS_MLME_SEARCH:
1712 ieee80211_sta_find_ibss(sdata);
1714 case IEEE80211_IBSS_MLME_JOINED:
1715 ieee80211_sta_merge_ibss(sdata);
1723 sdata_unlock(sdata);
1726 static void ieee80211_ibss_timer(struct timer_list *t)
1728 struct ieee80211_sub_if_data *sdata =
1729 from_timer(sdata, t, u.ibss.timer);
1731 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1734 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1736 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1738 timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0);
1739 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1740 spin_lock_init(&ifibss->incomplete_lock);
1741 INIT_WORK(&ifibss->csa_connection_drop_work,
1742 ieee80211_csa_connection_drop_work);
1745 /* scan finished notification */
1746 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1748 struct ieee80211_sub_if_data *sdata;
1750 mutex_lock(&local->iflist_mtx);
1751 list_for_each_entry(sdata, &local->interfaces, list) {
1752 if (!ieee80211_sdata_running(sdata))
1754 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1756 sdata->u.ibss.last_scan_completed = jiffies;
1758 mutex_unlock(&local->iflist_mtx);
1761 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1762 struct cfg80211_ibss_params *params)
1766 struct ieee80211_supported_band *sband;
1767 enum ieee80211_chanctx_mode chanmode;
1768 struct ieee80211_local *local = sdata->local;
1769 int radar_detect_width = 0;
1773 if (params->chandef.chan->freq_offset) {
1774 /* this may work, but is untested */
1778 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1780 sdata->wdev.iftype);
1785 if (!params->userspace_handles_dfs)
1787 radar_detect_width = BIT(params->chandef.width);
1790 chanmode = (params->channel_fixed && !ret) ?
1791 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1793 mutex_lock(&local->chanctx_mtx);
1794 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode,
1795 radar_detect_width);
1796 mutex_unlock(&local->chanctx_mtx);
1800 if (params->bssid) {
1801 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1802 sdata->u.ibss.fixed_bssid = true;
1804 sdata->u.ibss.fixed_bssid = false;
1806 sdata->u.ibss.privacy = params->privacy;
1807 sdata->u.ibss.control_port = params->control_port;
1808 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1809 sdata->u.ibss.basic_rates = params->basic_rates;
1810 sdata->u.ibss.last_scan_completed = jiffies;
1812 /* fix basic_rates if channel does not support these rates */
1813 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef);
1814 sband = local->hw.wiphy->bands[params->chandef.chan->band];
1815 for (i = 0; i < sband->n_bitrates; i++) {
1816 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1817 sdata->u.ibss.basic_rates &= ~BIT(i);
1819 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1820 sizeof(params->mcast_rate));
1822 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1824 sdata->u.ibss.chandef = params->chandef;
1825 sdata->u.ibss.fixed_channel = params->channel_fixed;
1828 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1830 if (sdata->u.ibss.ie)
1831 sdata->u.ibss.ie_len = params->ie_len;
1834 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1835 sdata->u.ibss.ibss_join_req = jiffies;
1837 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1838 sdata->u.ibss.ssid_len = params->ssid_len;
1840 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa,
1841 sizeof(sdata->u.ibss.ht_capa));
1842 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask,
1843 sizeof(sdata->u.ibss.ht_capa_mask));
1846 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1847 * reserved, but an HT STA shall protect HT transmissions as though
1848 * the HT Protection field were set to non-HT mixed mode.
1850 * In an IBSS, the RIFS Mode field of the HT Operation element is
1851 * also reserved, but an HT STA shall operate as though this field
1855 sdata->vif.bss_conf.ht_operation_mode |=
1856 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1857 | IEEE80211_HT_PARAM_RIFS_MODE;
1859 changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE;
1860 ieee80211_bss_info_change_notify(sdata, changed);
1862 sdata->smps_mode = IEEE80211_SMPS_OFF;
1863 sdata->needed_rx_chains = local->rx_chains;
1864 sdata->control_port_over_nl80211 = params->control_port_over_nl80211;
1866 ieee80211_queue_work(&local->hw, &sdata->work);
1871 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1873 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1875 ieee80211_ibss_disconnect(sdata);
1876 ifibss->ssid_len = 0;
1877 eth_zero_addr(ifibss->bssid);
1880 kfree(sdata->u.ibss.ie);
1881 sdata->u.ibss.ie = NULL;
1882 sdata->u.ibss.ie_len = 0;
1884 /* on the next join, re-program HT parameters */
1885 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1886 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1890 skb_queue_purge(&sdata->skb_queue);
1892 del_timer_sync(&sdata->u.ibss.timer);