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 == NL80211_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 == NL80211_BAND_5GHZ;
354 bss_change |= BSS_CHANGED_ERP_SLOT;
356 /* cf. IEEE 802.11 9.2.12 */
357 if (chan->band == NL80211_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,
431 chandef.width = sdata->u.ibss.chandef.width;
433 case NL80211_CHAN_WIDTH_80:
434 case NL80211_CHAN_WIDTH_80P80:
435 case NL80211_CHAN_WIDTH_160:
436 chandef = sdata->u.ibss.chandef;
437 chandef.chan = cbss->channel;
440 /* fall back to 20 MHz for unsupported modes */
441 cfg80211_chandef_create(&chandef, cbss->channel,
446 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
447 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
448 shift = ieee80211_vif_get_shift(&sdata->vif);
452 for (i = 0; i < bss->supp_rates_len; i++) {
453 int rate = bss->supp_rates[i] & 0x7f;
454 bool is_basic = !!(bss->supp_rates[i] & 0x80);
456 for (j = 0; j < sband->n_bitrates; j++) {
458 if ((rate_flags & sband->bitrates[j].flags)
462 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
466 basic_rates |= BIT(j);
473 ies = rcu_dereference(cbss->ies);
477 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
485 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
486 struct cfg80211_csa_settings *csa_settings)
488 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
489 struct beacon_data *presp, *old_presp;
490 struct cfg80211_bss *cbss;
491 const struct cfg80211_bss_ies *ies;
492 u16 capability = WLAN_CAPABILITY_IBSS;
496 sdata_assert_lock(sdata);
499 capability |= WLAN_CAPABILITY_PRIVACY;
501 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
502 ifibss->bssid, ifibss->ssid,
503 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS,
504 IEEE80211_PRIVACY(ifibss->privacy));
506 if (WARN_ON(!cbss)) {
512 ies = rcu_dereference(cbss->ies);
515 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
517 old_presp = rcu_dereference_protected(ifibss->presp,
518 lockdep_is_held(&sdata->wdev.mtx));
520 presp = ieee80211_ibss_build_presp(sdata,
521 sdata->vif.bss_conf.beacon_int,
522 sdata->vif.bss_conf.basic_rates,
523 capability, tsf, &ifibss->chandef,
530 rcu_assign_pointer(ifibss->presp, presp);
532 kfree_rcu(old_presp, rcu_head);
534 return BSS_CHANGED_BEACON;
539 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
541 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
542 struct cfg80211_bss *cbss;
543 int err, changed = 0;
545 sdata_assert_lock(sdata);
547 /* When not connected/joined, sending CSA doesn't make sense. */
548 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED)
551 /* update cfg80211 bss information with the new channel */
552 if (!is_zero_ether_addr(ifibss->bssid)) {
553 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
554 ifibss->chandef.chan,
555 ifibss->bssid, ifibss->ssid,
557 IEEE80211_BSS_TYPE_IBSS,
558 IEEE80211_PRIVACY(ifibss->privacy));
559 /* XXX: should not really modify cfg80211 data */
561 cbss->channel = sdata->csa_chandef.chan;
562 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
566 ifibss->chandef = sdata->csa_chandef;
568 /* generate the beacon */
569 err = ieee80211_ibss_csa_beacon(sdata, NULL);
578 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
580 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
582 cancel_work_sync(&ifibss->csa_connection_drop_work);
585 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
588 struct ieee80211_sub_if_data *sdata = sta->sdata;
591 memcpy(addr, sta->sta.addr, ETH_ALEN);
593 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
595 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
596 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
597 /* authorize the station only if the network is not RSN protected. If
598 * not wait for the userspace to authorize it */
599 if (!sta->sdata->u.ibss.control_port)
600 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
602 rate_control_rate_init(sta);
604 /* If it fails, maybe we raced another insertion? */
605 if (sta_info_insert_rcu(sta))
606 return sta_info_get(sdata, addr);
610 static struct sta_info *
611 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
612 const u8 *addr, u32 supp_rates)
615 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
616 struct ieee80211_local *local = sdata->local;
617 struct sta_info *sta;
618 struct ieee80211_chanctx_conf *chanctx_conf;
619 struct ieee80211_supported_band *sband;
620 enum nl80211_bss_scan_width scan_width;
624 * XXX: Consider removing the least recently used entry and
625 * allow new one to be added.
627 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
628 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
634 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
639 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
645 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
646 if (WARN_ON_ONCE(!chanctx_conf))
648 band = chanctx_conf->def.chan->band;
649 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
652 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
658 /* make sure mandatory rates are always added */
659 sband = local->hw.wiphy->bands[band];
660 sta->sta.supp_rates[band] = supp_rates |
661 ieee80211_mandatory_rates(sband, scan_width);
663 return ieee80211_ibss_finish_sta(sta);
666 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
668 struct ieee80211_local *local = sdata->local;
670 struct sta_info *sta;
672 sdata_assert_lock(sdata);
676 list_for_each_entry_rcu(sta, &local->sta_list, list) {
677 unsigned long last_active = ieee80211_sta_last_active(sta);
679 if (sta->sdata == sdata &&
680 time_is_after_jiffies(last_active +
681 IEEE80211_IBSS_MERGE_INTERVAL)) {
692 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
694 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
695 struct ieee80211_local *local = sdata->local;
696 struct cfg80211_bss *cbss;
697 struct beacon_data *presp;
698 struct sta_info *sta;
700 if (!is_zero_ether_addr(ifibss->bssid)) {
701 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
702 ifibss->bssid, ifibss->ssid,
704 IEEE80211_BSS_TYPE_IBSS,
705 IEEE80211_PRIVACY(ifibss->privacy));
708 cfg80211_unlink_bss(local->hw.wiphy, cbss);
709 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
713 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
715 sta_info_flush(sdata);
717 spin_lock_bh(&ifibss->incomplete_lock);
718 while (!list_empty(&ifibss->incomplete_stations)) {
719 sta = list_first_entry(&ifibss->incomplete_stations,
720 struct sta_info, list);
721 list_del(&sta->list);
722 spin_unlock_bh(&ifibss->incomplete_lock);
724 sta_info_free(local, sta);
725 spin_lock_bh(&ifibss->incomplete_lock);
727 spin_unlock_bh(&ifibss->incomplete_lock);
729 netif_carrier_off(sdata->dev);
731 sdata->vif.bss_conf.ibss_joined = false;
732 sdata->vif.bss_conf.ibss_creator = false;
733 sdata->vif.bss_conf.enable_beacon = false;
734 sdata->vif.bss_conf.ssid_len = 0;
737 presp = rcu_dereference_protected(ifibss->presp,
738 lockdep_is_held(&sdata->wdev.mtx));
739 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
741 kfree_rcu(presp, rcu_head);
743 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
744 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
746 drv_leave_ibss(local, sdata);
747 mutex_lock(&local->mtx);
748 ieee80211_vif_release_channel(sdata);
749 mutex_unlock(&local->mtx);
752 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
754 struct ieee80211_sub_if_data *sdata =
755 container_of(work, struct ieee80211_sub_if_data,
756 u.ibss.csa_connection_drop_work);
760 ieee80211_ibss_disconnect(sdata);
762 skb_queue_purge(&sdata->skb_queue);
764 /* trigger a scan to find another IBSS network to join */
765 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
770 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
772 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
775 /* if the current channel is a DFS channel, mark the channel as
778 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
780 NL80211_IFTYPE_ADHOC);
782 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
787 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
788 struct ieee802_11_elems *elems,
791 struct cfg80211_csa_settings params;
792 struct ieee80211_csa_ie csa_ie;
793 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
794 enum nl80211_channel_type ch_type;
798 sdata_assert_lock(sdata);
800 sta_flags = IEEE80211_STA_DISABLE_VHT;
801 switch (ifibss->chandef.width) {
802 case NL80211_CHAN_WIDTH_5:
803 case NL80211_CHAN_WIDTH_10:
804 case NL80211_CHAN_WIDTH_20_NOHT:
805 sta_flags |= IEEE80211_STA_DISABLE_HT;
807 case NL80211_CHAN_WIDTH_20:
808 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
814 memset(¶ms, 0, sizeof(params));
815 memset(&csa_ie, 0, sizeof(csa_ie));
816 err = ieee80211_parse_ch_switch_ie(sdata, elems,
817 ifibss->chandef.chan->band,
818 sta_flags, ifibss->bssid, &csa_ie);
819 /* can't switch to destination channel, fail */
823 /* did not contain a CSA */
827 /* channel switch is not supported, disconnect */
828 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
831 params.count = csa_ie.count;
832 params.chandef = csa_ie.chandef;
834 switch (ifibss->chandef.width) {
835 case NL80211_CHAN_WIDTH_20_NOHT:
836 case NL80211_CHAN_WIDTH_20:
837 case NL80211_CHAN_WIDTH_40:
838 /* keep our current HT mode (HT20/HT40+/HT40-), even if
839 * another mode has been announced. The mode is not adopted
840 * within the beacon while doing CSA and we should therefore
841 * keep the mode which we announce.
843 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
844 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan,
847 case NL80211_CHAN_WIDTH_5:
848 case NL80211_CHAN_WIDTH_10:
849 if (params.chandef.width != ifibss->chandef.width) {
851 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
853 params.chandef.chan->center_freq,
854 params.chandef.width,
855 params.chandef.center_freq1,
856 params.chandef.center_freq2);
861 /* should not happen, sta_flags should prevent VHT modes. */
866 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef,
867 NL80211_IFTYPE_ADHOC)) {
869 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
871 params.chandef.chan->center_freq,
872 params.chandef.width,
873 params.chandef.center_freq1,
874 params.chandef.center_freq2);
878 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
880 NL80211_IFTYPE_ADHOC);
883 if (err > 0 && !ifibss->userspace_handles_dfs) {
884 /* IBSS-DFS only allowed with a control program */
888 params.radar_required = err;
890 if (cfg80211_chandef_identical(¶ms.chandef,
891 &sdata->vif.bss_conf.chandef)) {
893 "received csa with an identical chandef, ignoring\n");
897 /* all checks done, now perform the channel switch. */
899 "received channel switch announcement to go to channel %d MHz\n",
900 params.chandef.chan->center_freq);
902 params.block_tx = !!csa_ie.mode;
904 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
908 ieee80211_ibss_csa_mark_radar(sdata);
912 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
913 ieee80211_queue_work(&sdata->local->hw,
914 &ifibss->csa_connection_drop_work);
916 ieee80211_ibss_csa_mark_radar(sdata);
922 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
923 struct ieee80211_mgmt *mgmt, size_t len,
924 struct ieee80211_rx_status *rx_status,
925 struct ieee802_11_elems *elems)
929 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
932 /* CSA is the only action we handle for now */
933 if (mgmt->u.action.u.measurement.action_code !=
934 WLAN_ACTION_SPCT_CHL_SWITCH)
937 required_len = IEEE80211_MIN_ACTION_SIZE +
938 sizeof(mgmt->u.action.u.chan_switch);
939 if (len < required_len)
942 if (!sdata->vif.csa_active)
943 ieee80211_ibss_process_chanswitch(sdata, elems, false);
946 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
947 struct ieee80211_mgmt *mgmt,
950 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
952 if (len < IEEE80211_DEAUTH_FRAME_LEN)
955 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
956 ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason);
957 sta_info_destroy_addr(sdata, mgmt->sa);
960 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
961 struct ieee80211_mgmt *mgmt,
964 u16 auth_alg, auth_transaction;
966 sdata_assert_lock(sdata);
971 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
972 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
974 ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
975 ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n",
976 mgmt->bssid, auth_transaction);
978 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
982 * IEEE 802.11 standard does not require authentication in IBSS
983 * networks and most implementations do not seem to use it.
984 * However, try to reply to authentication attempts if someone
985 * has actually implemented this.
987 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
988 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
991 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
992 struct ieee80211_mgmt *mgmt, size_t len,
993 struct ieee80211_rx_status *rx_status,
994 struct ieee802_11_elems *elems,
995 struct ieee80211_channel *channel)
997 struct sta_info *sta;
998 enum nl80211_band band = rx_status->band;
999 enum nl80211_bss_scan_width scan_width;
1000 struct ieee80211_local *local = sdata->local;
1001 struct ieee80211_supported_band *sband;
1002 bool rates_updated = false;
1005 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1008 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
1011 sband = local->hw.wiphy->bands[band];
1012 if (WARN_ON(!sband))
1016 sta = sta_info_get(sdata, mgmt->sa);
1018 if (elems->supp_rates) {
1019 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1024 prev_rates = sta->sta.supp_rates[band];
1025 /* make sure mandatory rates are always added */
1026 scan_width = NL80211_BSS_CHAN_WIDTH_20;
1027 if (rx_status->flag & RX_FLAG_5MHZ)
1028 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1029 if (rx_status->flag & RX_FLAG_10MHZ)
1030 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1032 sta->sta.supp_rates[band] = supp_rates |
1033 ieee80211_mandatory_rates(sband, scan_width);
1034 if (sta->sta.supp_rates[band] != prev_rates) {
1036 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1037 sta->sta.addr, prev_rates,
1038 sta->sta.supp_rates[band]);
1039 rates_updated = true;
1043 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1044 mgmt->sa, supp_rates);
1048 if (sta && !sta->sta.wme &&
1049 elems->wmm_info && local->hw.queues >= IEEE80211_NUM_ACS) {
1050 sta->sta.wme = true;
1051 ieee80211_check_fast_xmit(sta);
1054 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1055 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1056 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1057 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1058 /* we both use HT */
1059 struct ieee80211_ht_cap htcap_ie;
1060 struct cfg80211_chan_def chandef;
1061 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
1063 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT);
1064 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef);
1066 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1067 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1071 if (elems->vht_operation && elems->vht_cap_elem &&
1072 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1073 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1074 /* we both use VHT */
1075 struct ieee80211_vht_cap cap_ie;
1076 struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap;
1078 ieee80211_chandef_vht_oper(elems->vht_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, elems,
1135 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1137 /* same for beacon and probe response */
1138 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1140 /* check if we need to merge IBSS */
1143 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1146 /* different channel */
1147 if (sdata->u.ibss.fixed_channel &&
1148 sdata->u.ibss.chandef.chan != cbss->channel)
1151 /* different SSID */
1152 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1153 memcmp(elems->ssid, sdata->u.ibss.ssid,
1154 sdata->u.ibss.ssid_len))
1157 /* process channel switch */
1158 if (sdata->vif.csa_active ||
1159 ieee80211_ibss_process_chanswitch(sdata, elems, true))
1163 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1166 /* we use a fixed BSSID */
1167 if (sdata->u.ibss.fixed_bssid)
1170 if (ieee80211_have_rx_timestamp(rx_status)) {
1171 /* time when timestamp field was received */
1173 ieee80211_calculate_rx_timestamp(local, rx_status,
1177 * second best option: get current TSF
1178 * (will return -1 if not supported)
1180 rx_timestamp = drv_get_tsf(local, sdata);
1183 ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n",
1184 mgmt->sa, mgmt->bssid,
1185 (unsigned long long)rx_timestamp);
1186 ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n",
1187 (unsigned long long)beacon_timestamp,
1188 (unsigned long long)(rx_timestamp - beacon_timestamp),
1191 if (beacon_timestamp > rx_timestamp) {
1193 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1195 ieee80211_sta_join_ibss(sdata, bss);
1196 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1197 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1203 ieee80211_rx_bss_put(local, bss);
1206 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1207 const u8 *bssid, const u8 *addr,
1210 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1211 struct ieee80211_local *local = sdata->local;
1212 struct sta_info *sta;
1213 struct ieee80211_chanctx_conf *chanctx_conf;
1214 struct ieee80211_supported_band *sband;
1215 enum nl80211_bss_scan_width scan_width;
1219 * XXX: Consider removing the least recently used entry and
1220 * allow new one to be added.
1222 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1223 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1228 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1231 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1235 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1236 if (WARN_ON_ONCE(!chanctx_conf)) {
1240 band = chanctx_conf->def.chan->band;
1241 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1244 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1248 /* make sure mandatory rates are always added */
1249 sband = local->hw.wiphy->bands[band];
1250 sta->sta.supp_rates[band] = supp_rates |
1251 ieee80211_mandatory_rates(sband, scan_width);
1253 spin_lock(&ifibss->incomplete_lock);
1254 list_add(&sta->list, &ifibss->incomplete_stations);
1255 spin_unlock(&ifibss->incomplete_lock);
1256 ieee80211_queue_work(&local->hw, &sdata->work);
1259 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
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 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1278 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1279 "not authorized " : "", sta->sta.addr);
1281 WARN_ON(__sta_info_destroy(sta));
1285 mutex_unlock(&local->sta_mtx);
1289 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1292 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1294 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1295 enum nl80211_bss_scan_width scan_width;
1297 sdata_assert_lock(sdata);
1299 mod_timer(&ifibss->timer,
1300 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1302 ieee80211_ibss_sta_expire(sdata);
1304 if (time_before(jiffies, ifibss->last_scan_completed +
1305 IEEE80211_IBSS_MERGE_INTERVAL))
1308 if (ieee80211_sta_active_ibss(sdata))
1311 if (ifibss->fixed_channel)
1315 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1317 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1318 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1319 NULL, 0, scan_width);
1322 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1324 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1329 sdata_assert_lock(sdata);
1331 if (ifibss->fixed_bssid) {
1332 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1334 /* Generate random, not broadcast, locally administered BSSID. Mix in
1335 * own MAC address to make sure that devices that do not have proper
1336 * random number generator get different BSSID. */
1337 get_random_bytes(bssid, ETH_ALEN);
1338 for (i = 0; i < ETH_ALEN; i++)
1339 bssid[i] ^= sdata->vif.addr[i];
1344 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1346 capability = WLAN_CAPABILITY_IBSS;
1348 if (ifibss->privacy)
1349 capability |= WLAN_CAPABILITY_PRIVACY;
1351 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1352 &ifibss->chandef, ifibss->basic_rates,
1353 capability, 0, true);
1356 static unsigned ibss_setup_channels(struct wiphy *wiphy,
1357 struct ieee80211_channel **channels,
1358 unsigned int channels_max,
1359 u32 center_freq, u32 width)
1361 struct ieee80211_channel *chan = NULL;
1362 unsigned int n_chan = 0;
1363 u32 start_freq, end_freq, freq;
1366 start_freq = center_freq;
1367 end_freq = center_freq;
1369 start_freq = center_freq - width / 2 + 10;
1370 end_freq = center_freq + width / 2 - 10;
1373 for (freq = start_freq; freq <= end_freq; freq += 20) {
1374 chan = ieee80211_get_channel(wiphy, freq);
1377 if (n_chan >= channels_max)
1380 channels[n_chan] = chan;
1388 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1389 const struct cfg80211_chan_def *chandef,
1390 struct ieee80211_channel **channels,
1391 unsigned int channels_max)
1393 unsigned int n_chan = 0;
1394 u32 width, cf1, cf2 = 0;
1396 switch (chandef->width) {
1397 case NL80211_CHAN_WIDTH_40:
1400 case NL80211_CHAN_WIDTH_80P80:
1401 cf2 = chandef->center_freq2;
1403 case NL80211_CHAN_WIDTH_80:
1406 case NL80211_CHAN_WIDTH_160:
1414 cf1 = chandef->center_freq1;
1416 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1419 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1420 channels_max - n_chan, cf2,
1427 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1430 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1432 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1433 struct ieee80211_local *local = sdata->local;
1434 struct cfg80211_bss *cbss;
1435 struct ieee80211_channel *chan = NULL;
1436 const u8 *bssid = NULL;
1437 enum nl80211_bss_scan_width scan_width;
1440 sdata_assert_lock(sdata);
1442 active_ibss = ieee80211_sta_active_ibss(sdata);
1443 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1448 if (ifibss->fixed_bssid)
1449 bssid = ifibss->bssid;
1450 if (ifibss->fixed_channel)
1451 chan = ifibss->chandef.chan;
1452 if (!is_zero_ether_addr(ifibss->bssid))
1453 bssid = ifibss->bssid;
1454 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1455 ifibss->ssid, ifibss->ssid_len,
1456 IEEE80211_BSS_TYPE_IBSS,
1457 IEEE80211_PRIVACY(ifibss->privacy));
1460 struct ieee80211_bss *bss;
1462 bss = (void *)cbss->priv;
1464 "sta_find_ibss: selected %pM current %pM\n",
1465 cbss->bssid, ifibss->bssid);
1467 "Selected IBSS BSSID %pM based on configured SSID\n",
1470 ieee80211_sta_join_ibss(sdata, bss);
1471 ieee80211_rx_bss_put(local, bss);
1475 /* if a fixed bssid and a fixed freq have been provided create the IBSS
1476 * directly and do not waste time scanning
1478 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1479 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1481 ieee80211_sta_create_ibss(sdata);
1486 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1488 /* Selected IBSS not found in current scan results - try to scan */
1489 if (time_after(jiffies, ifibss->last_scan_completed +
1490 IEEE80211_SCAN_INTERVAL)) {
1491 struct ieee80211_channel *channels[8];
1494 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1496 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1498 if (ifibss->fixed_channel) {
1499 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1502 ARRAY_SIZE(channels));
1503 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1504 ifibss->ssid_len, channels,
1507 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1508 ifibss->ssid_len, NULL,
1512 int interval = IEEE80211_SCAN_INTERVAL;
1514 if (time_after(jiffies, ifibss->ibss_join_req +
1515 IEEE80211_IBSS_JOIN_TIMEOUT))
1516 ieee80211_sta_create_ibss(sdata);
1518 mod_timer(&ifibss->timer,
1519 round_jiffies(jiffies + interval));
1523 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1524 struct sk_buff *req)
1526 struct ieee80211_mgmt *mgmt = (void *)req->data;
1527 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1528 struct ieee80211_local *local = sdata->local;
1529 int tx_last_beacon, len = req->len;
1530 struct sk_buff *skb;
1531 struct beacon_data *presp;
1534 sdata_assert_lock(sdata);
1536 presp = rcu_dereference_protected(ifibss->presp,
1537 lockdep_is_held(&sdata->wdev.mtx));
1539 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1540 len < 24 + 2 || !presp)
1543 tx_last_beacon = drv_tx_last_beacon(local);
1545 ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
1546 ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n",
1547 mgmt->bssid, tx_last_beacon);
1549 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1552 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1553 !is_broadcast_ether_addr(mgmt->bssid))
1556 end = ((u8 *) mgmt) + len;
1557 pos = mgmt->u.probe_req.variable;
1558 if (pos[0] != WLAN_EID_SSID ||
1559 pos + 2 + pos[1] > end) {
1560 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1565 (pos[1] != ifibss->ssid_len ||
1566 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1567 /* Ignore ProbeReq for foreign SSID */
1571 /* Reply with ProbeResp */
1572 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1576 skb_reserve(skb, local->tx_headroom);
1577 memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
1579 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1580 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1581 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1583 /* avoid excessive retries for probe request to wildcard SSIDs */
1585 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1587 ieee80211_tx_skb(sdata, skb);
1591 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1592 struct ieee80211_mgmt *mgmt, size_t len,
1593 struct ieee80211_rx_status *rx_status)
1596 struct ieee802_11_elems elems;
1598 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1599 offsetof(typeof(mgmt->u.beacon), variable));
1602 * either beacon or probe_resp but the variable field is at the
1605 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1609 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1612 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1615 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1616 struct sk_buff *skb)
1618 struct ieee80211_rx_status *rx_status;
1619 struct ieee80211_mgmt *mgmt;
1621 struct ieee802_11_elems elems;
1624 rx_status = IEEE80211_SKB_RXCB(skb);
1625 mgmt = (struct ieee80211_mgmt *) skb->data;
1626 fc = le16_to_cpu(mgmt->frame_control);
1630 if (!sdata->u.ibss.ssid_len)
1631 goto mgmt_out; /* not ready to merge yet */
1633 switch (fc & IEEE80211_FCTL_STYPE) {
1634 case IEEE80211_STYPE_PROBE_REQ:
1635 ieee80211_rx_mgmt_probe_req(sdata, skb);
1637 case IEEE80211_STYPE_PROBE_RESP:
1638 case IEEE80211_STYPE_BEACON:
1639 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1642 case IEEE80211_STYPE_AUTH:
1643 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1645 case IEEE80211_STYPE_DEAUTH:
1646 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1648 case IEEE80211_STYPE_ACTION:
1649 switch (mgmt->u.action.category) {
1650 case WLAN_CATEGORY_SPECTRUM_MGMT:
1651 ies_len = skb->len -
1652 offsetof(struct ieee80211_mgmt,
1653 u.action.u.chan_switch.variable);
1658 ieee802_11_parse_elems(
1659 mgmt->u.action.u.chan_switch.variable,
1660 ies_len, true, &elems);
1662 if (elems.parse_error)
1665 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1672 sdata_unlock(sdata);
1675 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1677 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1678 struct sta_info *sta;
1683 * Work could be scheduled after scan or similar
1684 * when we aren't even joined (or trying) with a
1687 if (!ifibss->ssid_len)
1690 spin_lock_bh(&ifibss->incomplete_lock);
1691 while (!list_empty(&ifibss->incomplete_stations)) {
1692 sta = list_first_entry(&ifibss->incomplete_stations,
1693 struct sta_info, list);
1694 list_del(&sta->list);
1695 spin_unlock_bh(&ifibss->incomplete_lock);
1697 ieee80211_ibss_finish_sta(sta);
1699 spin_lock_bh(&ifibss->incomplete_lock);
1701 spin_unlock_bh(&ifibss->incomplete_lock);
1703 switch (ifibss->state) {
1704 case IEEE80211_IBSS_MLME_SEARCH:
1705 ieee80211_sta_find_ibss(sdata);
1707 case IEEE80211_IBSS_MLME_JOINED:
1708 ieee80211_sta_merge_ibss(sdata);
1716 sdata_unlock(sdata);
1719 static void ieee80211_ibss_timer(unsigned long data)
1721 struct ieee80211_sub_if_data *sdata =
1722 (struct ieee80211_sub_if_data *) data;
1724 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1727 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1729 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1731 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1732 (unsigned long) sdata);
1733 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1734 spin_lock_init(&ifibss->incomplete_lock);
1735 INIT_WORK(&ifibss->csa_connection_drop_work,
1736 ieee80211_csa_connection_drop_work);
1739 /* scan finished notification */
1740 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1742 struct ieee80211_sub_if_data *sdata;
1744 mutex_lock(&local->iflist_mtx);
1745 list_for_each_entry(sdata, &local->interfaces, list) {
1746 if (!ieee80211_sdata_running(sdata))
1748 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1750 sdata->u.ibss.last_scan_completed = jiffies;
1752 mutex_unlock(&local->iflist_mtx);
1755 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1756 struct cfg80211_ibss_params *params)
1760 struct ieee80211_supported_band *sband;
1761 enum ieee80211_chanctx_mode chanmode;
1762 struct ieee80211_local *local = sdata->local;
1763 int radar_detect_width = 0;
1767 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1769 sdata->wdev.iftype);
1774 if (!params->userspace_handles_dfs)
1776 radar_detect_width = BIT(params->chandef.width);
1779 chanmode = (params->channel_fixed && !ret) ?
1780 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1782 mutex_lock(&local->chanctx_mtx);
1783 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode,
1784 radar_detect_width);
1785 mutex_unlock(&local->chanctx_mtx);
1789 if (params->bssid) {
1790 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1791 sdata->u.ibss.fixed_bssid = true;
1793 sdata->u.ibss.fixed_bssid = false;
1795 sdata->u.ibss.privacy = params->privacy;
1796 sdata->u.ibss.control_port = params->control_port;
1797 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1798 sdata->u.ibss.basic_rates = params->basic_rates;
1799 sdata->u.ibss.last_scan_completed = jiffies;
1801 /* fix basic_rates if channel does not support these rates */
1802 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef);
1803 sband = local->hw.wiphy->bands[params->chandef.chan->band];
1804 for (i = 0; i < sband->n_bitrates; i++) {
1805 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1806 sdata->u.ibss.basic_rates &= ~BIT(i);
1808 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1809 sizeof(params->mcast_rate));
1811 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1813 sdata->u.ibss.chandef = params->chandef;
1814 sdata->u.ibss.fixed_channel = params->channel_fixed;
1817 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1819 if (sdata->u.ibss.ie)
1820 sdata->u.ibss.ie_len = params->ie_len;
1823 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1824 sdata->u.ibss.ibss_join_req = jiffies;
1826 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1827 sdata->u.ibss.ssid_len = params->ssid_len;
1829 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa,
1830 sizeof(sdata->u.ibss.ht_capa));
1831 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask,
1832 sizeof(sdata->u.ibss.ht_capa_mask));
1835 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1836 * reserved, but an HT STA shall protect HT transmissions as though
1837 * the HT Protection field were set to non-HT mixed mode.
1839 * In an IBSS, the RIFS Mode field of the HT Operation element is
1840 * also reserved, but an HT STA shall operate as though this field
1844 sdata->vif.bss_conf.ht_operation_mode |=
1845 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1846 | IEEE80211_HT_PARAM_RIFS_MODE;
1848 changed |= BSS_CHANGED_HT;
1849 ieee80211_bss_info_change_notify(sdata, changed);
1851 sdata->smps_mode = IEEE80211_SMPS_OFF;
1852 sdata->needed_rx_chains = local->rx_chains;
1854 ieee80211_queue_work(&local->hw, &sdata->work);
1859 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1861 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1863 ieee80211_ibss_disconnect(sdata);
1864 ifibss->ssid_len = 0;
1865 eth_zero_addr(ifibss->bssid);
1868 kfree(sdata->u.ibss.ie);
1869 sdata->u.ibss.ie = NULL;
1870 sdata->u.ibss.ie_len = 0;
1872 /* on the next join, re-program HT parameters */
1873 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1874 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1878 skb_queue_purge(&sdata->skb_queue);
1880 del_timer_sync(&sdata->u.ibss.timer);