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) 2018-2023 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;
55 /* Build IBSS probe response */
56 frame_len = sizeof(struct ieee80211_hdr_3addr) +
57 12 /* struct ieee80211_mgmt.u.beacon */ +
58 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
59 2 + 8 /* max Supported Rates */ +
60 3 /* max DS params */ +
62 5 /* Channel Switch Announcement */ +
63 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
64 2 + sizeof(struct ieee80211_ht_cap) +
65 2 + sizeof(struct ieee80211_ht_operation) +
66 2 + sizeof(struct ieee80211_vht_cap) +
67 2 + sizeof(struct ieee80211_vht_operation) +
69 presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
73 presp->head = (void *)(presp + 1);
75 mgmt = (void *) presp->head;
76 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
77 IEEE80211_STYPE_PROBE_RESP);
78 eth_broadcast_addr(mgmt->da);
79 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
80 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
81 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
82 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
83 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
85 pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
87 *pos++ = WLAN_EID_SSID;
88 *pos++ = ifibss->ssid_len;
89 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
90 pos += ifibss->ssid_len;
92 sband = local->hw.wiphy->bands[chandef->chan->band];
93 rate_flags = ieee80211_chandef_rate_flags(chandef);
95 if (have_higher_than_11mbit)
96 *have_higher_than_11mbit = false;
98 for (i = 0; i < sband->n_bitrates; i++) {
99 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
101 if (sband->bitrates[i].bitrate > 110 &&
102 have_higher_than_11mbit)
103 *have_higher_than_11mbit = true;
109 *pos++ = WLAN_EID_SUPP_RATES;
110 *pos++ = min_t(int, 8, rates_n);
111 for (ri = 0; ri < sband->n_bitrates; ri++) {
112 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 5);
114 if (!(rates & BIT(ri)))
117 if (basic_rates & BIT(ri))
119 *pos++ = basic | (u8) rate;
120 if (++rates_added == 8) {
121 ri++; /* continue at next rate for EXT_SUPP_RATES */
126 if (sband->band == NL80211_BAND_2GHZ) {
127 *pos++ = WLAN_EID_DS_PARAMS;
129 *pos++ = ieee80211_frequency_to_channel(
130 chandef->chan->center_freq);
133 *pos++ = WLAN_EID_IBSS_PARAMS;
135 /* FIX: set ATIM window based on scan results */
140 *pos++ = WLAN_EID_CHANNEL_SWITCH;
142 *pos++ = csa_settings->block_tx ? 1 : 0;
143 *pos++ = ieee80211_frequency_to_channel(
144 csa_settings->chandef.chan->center_freq);
145 presp->cntdwn_counter_offsets[0] = (pos - presp->head);
146 *pos++ = csa_settings->count;
147 presp->cntdwn_current_counter = csa_settings->count;
150 /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
152 *pos++ = WLAN_EID_EXT_SUPP_RATES;
153 *pos++ = rates_n - 8;
154 for (; ri < sband->n_bitrates; ri++) {
155 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 5);
157 if (!(rates & BIT(ri)))
160 if (basic_rates & BIT(ri))
162 *pos++ = basic | (u8) rate;
166 if (ifibss->ie_len) {
167 memcpy(pos, ifibss->ie, ifibss->ie_len);
168 pos += ifibss->ie_len;
171 /* add HT capability and information IEs */
172 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
173 chandef->width != NL80211_CHAN_WIDTH_5 &&
174 chandef->width != NL80211_CHAN_WIDTH_10 &&
175 sband->ht_cap.ht_supported) {
176 struct ieee80211_sta_ht_cap ht_cap;
178 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
179 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
181 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
183 * Note: According to 802.11n-2009 9.13.3.1, HT Protection
184 * field and RIFS Mode are reserved in IBSS mode, therefore
187 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
190 /* add VHT capability and information IEs */
191 if (chandef->width != NL80211_CHAN_WIDTH_20 &&
192 chandef->width != NL80211_CHAN_WIDTH_40 &&
193 sband->vht_cap.vht_supported) {
194 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
196 pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap,
201 if (local->hw.queues >= IEEE80211_NUM_ACS)
202 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */
204 presp->head_len = pos - presp->head;
205 if (WARN_ON(presp->head_len > frame_len))
214 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
215 const u8 *bssid, const int beacon_int,
216 struct cfg80211_chan_def *req_chandef,
217 const u32 basic_rates,
218 const u16 capability, u64 tsf,
221 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
222 struct ieee80211_local *local = sdata->local;
223 struct ieee80211_mgmt *mgmt;
224 struct cfg80211_bss *bss;
226 struct cfg80211_chan_def chandef;
227 struct ieee80211_channel *chan;
228 struct beacon_data *presp;
229 struct cfg80211_inform_bss bss_meta = {};
230 bool have_higher_than_11mbit;
234 lockdep_assert_wiphy(local->hw.wiphy);
236 /* Reset own TSF to allow time synchronization work. */
237 drv_reset_tsf(local, sdata);
239 if (!ether_addr_equal(ifibss->bssid, bssid))
240 sta_info_flush(sdata);
242 /* if merging, indicate to driver that we leave the old IBSS */
243 if (sdata->vif.cfg.ibss_joined) {
244 sdata->vif.cfg.ibss_joined = false;
245 sdata->vif.cfg.ibss_creator = false;
246 sdata->vif.bss_conf.enable_beacon = false;
247 netif_carrier_off(sdata->dev);
248 ieee80211_bss_info_change_notify(sdata,
250 BSS_CHANGED_BEACON_ENABLED);
251 drv_leave_ibss(local, sdata);
254 presp = sdata_dereference(ifibss->presp, sdata);
255 RCU_INIT_POINTER(ifibss->presp, NULL);
257 kfree_rcu(presp, rcu_head);
259 /* make a copy of the chandef, it could be modified below. */
260 chandef = *req_chandef;
262 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
263 NL80211_IFTYPE_ADHOC)) {
264 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
265 chandef.width == NL80211_CHAN_WIDTH_10 ||
266 chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
267 chandef.width == NL80211_CHAN_WIDTH_20) {
269 "Failed to join IBSS, beacons forbidden\n");
272 chandef.width = NL80211_CHAN_WIDTH_20;
273 chandef.center_freq1 = chan->center_freq;
274 /* check again for downgraded chandef */
275 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
276 NL80211_IFTYPE_ADHOC)) {
278 "Failed to join IBSS, beacons forbidden\n");
283 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
284 &chandef, NL80211_IFTYPE_ADHOC);
287 "Failed to join IBSS, invalid chandef\n");
290 if (err > 0 && !ifibss->userspace_handles_dfs) {
292 "Failed to join IBSS, DFS channel without control program\n");
296 radar_required = err;
298 if (ieee80211_link_use_channel(&sdata->deflink, &chandef,
299 ifibss->fixed_channel ?
300 IEEE80211_CHANCTX_SHARED :
301 IEEE80211_CHANCTX_EXCLUSIVE)) {
302 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
305 sdata->deflink.radar_required = radar_required;
307 memcpy(ifibss->bssid, bssid, ETH_ALEN);
309 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
310 capability, tsf, &chandef,
311 &have_higher_than_11mbit, NULL);
315 rcu_assign_pointer(ifibss->presp, presp);
316 mgmt = (void *)presp->head;
318 sdata->vif.bss_conf.enable_beacon = true;
319 sdata->vif.bss_conf.beacon_int = beacon_int;
320 sdata->vif.bss_conf.basic_rates = basic_rates;
321 sdata->vif.cfg.ssid_len = ifibss->ssid_len;
322 memcpy(sdata->vif.cfg.ssid, ifibss->ssid, ifibss->ssid_len);
323 bss_change = BSS_CHANGED_BEACON_INT;
324 bss_change |= ieee80211_reset_erp_info(sdata);
325 bss_change |= BSS_CHANGED_BSSID;
326 bss_change |= BSS_CHANGED_BEACON;
327 bss_change |= BSS_CHANGED_BEACON_ENABLED;
328 bss_change |= BSS_CHANGED_BASIC_RATES;
329 bss_change |= BSS_CHANGED_HT;
330 bss_change |= BSS_CHANGED_IBSS;
331 bss_change |= BSS_CHANGED_SSID;
334 * In 5 GHz/802.11a, we can always use short slot time.
335 * (IEEE 802.11-2012 18.3.8.7)
337 * In 2.4GHz, we must always use long slots in IBSS for compatibility
339 * (IEEE 802.11-2012 19.4.5)
341 * HT follows these specifications (IEEE 802.11-2012 20.3.18)
343 sdata->vif.bss_conf.use_short_slot = chan->band == NL80211_BAND_5GHZ;
344 bss_change |= BSS_CHANGED_ERP_SLOT;
346 /* cf. IEEE 802.11 9.2.12 */
347 sdata->deflink.operating_11g_mode =
348 chan->band == NL80211_BAND_2GHZ && have_higher_than_11mbit;
350 ieee80211_set_wmm_default(&sdata->deflink, true, false);
352 sdata->vif.cfg.ibss_joined = true;
353 sdata->vif.cfg.ibss_creator = creator;
355 err = drv_join_ibss(local, sdata);
357 sdata->vif.cfg.ibss_joined = false;
358 sdata->vif.cfg.ibss_creator = false;
359 sdata->vif.bss_conf.enable_beacon = false;
360 sdata->vif.cfg.ssid_len = 0;
361 RCU_INIT_POINTER(ifibss->presp, NULL);
362 kfree_rcu(presp, rcu_head);
363 ieee80211_link_release_channel(&sdata->deflink);
364 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
369 ieee80211_bss_info_change_notify(sdata, bss_change);
371 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
372 mod_timer(&ifibss->timer,
373 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
375 bss_meta.chan = chan;
376 bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt,
377 presp->head_len, GFP_KERNEL);
379 cfg80211_put_bss(local->hw.wiphy, bss);
380 netif_carrier_on(sdata->dev);
381 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
384 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
385 struct ieee80211_bss *bss)
387 struct cfg80211_bss *cbss =
388 container_of((void *)bss, struct cfg80211_bss, priv);
389 struct ieee80211_supported_band *sband;
390 struct cfg80211_chan_def chandef;
393 u16 beacon_int = cbss->beacon_interval;
394 const struct cfg80211_bss_ies *ies;
395 enum nl80211_channel_type chan_type;
399 lockdep_assert_wiphy(sdata->local->hw.wiphy);
404 switch (sdata->u.ibss.chandef.width) {
405 case NL80211_CHAN_WIDTH_20_NOHT:
406 case NL80211_CHAN_WIDTH_20:
407 case NL80211_CHAN_WIDTH_40:
408 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
409 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
411 case NL80211_CHAN_WIDTH_5:
412 case NL80211_CHAN_WIDTH_10:
413 cfg80211_chandef_create(&chandef, cbss->channel,
415 chandef.width = sdata->u.ibss.chandef.width;
417 case NL80211_CHAN_WIDTH_80:
418 case NL80211_CHAN_WIDTH_80P80:
419 case NL80211_CHAN_WIDTH_160:
420 chandef = sdata->u.ibss.chandef;
421 chandef.chan = cbss->channel;
424 /* fall back to 20 MHz for unsupported modes */
425 cfg80211_chandef_create(&chandef, cbss->channel,
430 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
431 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
435 for (i = 0; i < bss->supp_rates_len; i++) {
436 int rate = bss->supp_rates[i] & 0x7f;
437 bool is_basic = !!(bss->supp_rates[i] & 0x80);
439 for (j = 0; j < sband->n_bitrates; j++) {
441 if ((rate_flags & sband->bitrates[j].flags)
445 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate, 5);
448 basic_rates |= BIT(j);
455 ies = rcu_dereference(cbss->ies);
459 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
467 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
468 struct cfg80211_csa_settings *csa_settings,
471 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
472 struct beacon_data *presp, *old_presp;
473 struct cfg80211_bss *cbss;
474 const struct cfg80211_bss_ies *ies;
475 u16 capability = WLAN_CAPABILITY_IBSS;
478 lockdep_assert_wiphy(sdata->local->hw.wiphy);
481 capability |= WLAN_CAPABILITY_PRIVACY;
483 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
484 ifibss->bssid, ifibss->ssid,
485 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS,
486 IEEE80211_PRIVACY(ifibss->privacy));
492 ies = rcu_dereference(cbss->ies);
495 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
497 old_presp = sdata_dereference(ifibss->presp, sdata);
499 presp = ieee80211_ibss_build_presp(sdata,
500 sdata->vif.bss_conf.beacon_int,
501 sdata->vif.bss_conf.basic_rates,
502 capability, tsf, &ifibss->chandef,
507 rcu_assign_pointer(ifibss->presp, presp);
509 kfree_rcu(old_presp, rcu_head);
511 *changed |= BSS_CHANGED_BEACON;
515 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata, u64 *changed)
517 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
518 struct cfg80211_bss *cbss;
520 lockdep_assert_wiphy(sdata->local->hw.wiphy);
522 /* When not connected/joined, sending CSA doesn't make sense. */
523 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED)
526 /* update cfg80211 bss information with the new channel */
527 if (!is_zero_ether_addr(ifibss->bssid)) {
528 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
529 ifibss->chandef.chan,
530 ifibss->bssid, ifibss->ssid,
532 IEEE80211_BSS_TYPE_IBSS,
533 IEEE80211_PRIVACY(ifibss->privacy));
534 /* XXX: should not really modify cfg80211 data */
536 cbss->channel = sdata->deflink.csa_chandef.chan;
537 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
541 ifibss->chandef = sdata->deflink.csa_chandef;
543 /* generate the beacon */
544 return ieee80211_ibss_csa_beacon(sdata, NULL, changed);
547 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
549 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
551 wiphy_work_cancel(sdata->local->hw.wiphy,
552 &ifibss->csa_connection_drop_work);
555 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
558 struct ieee80211_sub_if_data *sdata = sta->sdata;
561 memcpy(addr, sta->sta.addr, ETH_ALEN);
563 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
565 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
566 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
567 /* authorize the station only if the network is not RSN protected. If
568 * not wait for the userspace to authorize it */
569 if (!sta->sdata->u.ibss.control_port)
570 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
572 rate_control_rate_init(sta);
574 /* If it fails, maybe we raced another insertion? */
575 if (sta_info_insert_rcu(sta))
576 return sta_info_get(sdata, addr);
580 static struct sta_info *
581 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
582 const u8 *addr, u32 supp_rates)
585 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
586 struct ieee80211_local *local = sdata->local;
587 struct sta_info *sta;
588 struct ieee80211_chanctx_conf *chanctx_conf;
589 struct ieee80211_supported_band *sband;
593 * XXX: Consider removing the least recently used entry and
594 * allow new one to be added.
596 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
597 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
603 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
608 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
614 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
615 if (WARN_ON_ONCE(!chanctx_conf))
617 band = chanctx_conf->def.chan->band;
620 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
626 /* make sure mandatory rates are always added */
627 sband = local->hw.wiphy->bands[band];
628 sta->sta.deflink.supp_rates[band] = supp_rates |
629 ieee80211_mandatory_rates(sband);
631 return ieee80211_ibss_finish_sta(sta);
634 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
636 struct ieee80211_local *local = sdata->local;
638 struct sta_info *sta;
640 lockdep_assert_wiphy(sdata->local->hw.wiphy);
644 list_for_each_entry_rcu(sta, &local->sta_list, list) {
645 unsigned long last_active = ieee80211_sta_last_active(sta);
647 if (sta->sdata == sdata &&
648 time_is_after_jiffies(last_active +
649 IEEE80211_IBSS_MERGE_INTERVAL)) {
660 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
662 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
663 struct ieee80211_local *local = sdata->local;
664 struct cfg80211_bss *cbss;
665 struct beacon_data *presp;
666 struct sta_info *sta;
668 lockdep_assert_wiphy(local->hw.wiphy);
670 if (!is_zero_ether_addr(ifibss->bssid)) {
671 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
672 ifibss->bssid, ifibss->ssid,
674 IEEE80211_BSS_TYPE_IBSS,
675 IEEE80211_PRIVACY(ifibss->privacy));
678 cfg80211_unlink_bss(local->hw.wiphy, cbss);
679 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
683 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
685 sta_info_flush(sdata);
687 spin_lock_bh(&ifibss->incomplete_lock);
688 while (!list_empty(&ifibss->incomplete_stations)) {
689 sta = list_first_entry(&ifibss->incomplete_stations,
690 struct sta_info, list);
691 list_del(&sta->list);
692 spin_unlock_bh(&ifibss->incomplete_lock);
694 sta_info_free(local, sta);
695 spin_lock_bh(&ifibss->incomplete_lock);
697 spin_unlock_bh(&ifibss->incomplete_lock);
699 netif_carrier_off(sdata->dev);
701 sdata->vif.cfg.ibss_joined = false;
702 sdata->vif.cfg.ibss_creator = false;
703 sdata->vif.bss_conf.enable_beacon = false;
704 sdata->vif.cfg.ssid_len = 0;
707 presp = sdata_dereference(ifibss->presp, sdata);
708 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
710 kfree_rcu(presp, rcu_head);
712 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
713 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
715 drv_leave_ibss(local, sdata);
716 ieee80211_link_release_channel(&sdata->deflink);
719 static void ieee80211_csa_connection_drop_work(struct wiphy *wiphy,
720 struct wiphy_work *work)
722 struct ieee80211_sub_if_data *sdata =
723 container_of(work, struct ieee80211_sub_if_data,
724 u.ibss.csa_connection_drop_work);
726 ieee80211_ibss_disconnect(sdata);
728 skb_queue_purge(&sdata->skb_queue);
730 /* trigger a scan to find another IBSS network to join */
731 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
734 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
736 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
739 /* if the current channel is a DFS channel, mark the channel as
742 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
744 NL80211_IFTYPE_ADHOC);
746 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
751 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
752 struct ieee802_11_elems *elems,
755 struct cfg80211_csa_settings params;
756 struct ieee80211_csa_ie csa_ie;
757 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
758 enum nl80211_channel_type ch_type;
760 ieee80211_conn_flags_t conn_flags;
761 u32 vht_cap_info = 0;
763 lockdep_assert_wiphy(sdata->local->hw.wiphy);
765 conn_flags = IEEE80211_CONN_DISABLE_VHT;
767 switch (ifibss->chandef.width) {
768 case NL80211_CHAN_WIDTH_5:
769 case NL80211_CHAN_WIDTH_10:
770 case NL80211_CHAN_WIDTH_20_NOHT:
771 conn_flags |= IEEE80211_CONN_DISABLE_HT;
773 case NL80211_CHAN_WIDTH_20:
774 conn_flags |= IEEE80211_CONN_DISABLE_40MHZ;
780 if (elems->vht_cap_elem)
781 vht_cap_info = le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
783 memset(¶ms, 0, sizeof(params));
784 err = ieee80211_parse_ch_switch_ie(sdata, elems,
785 ifibss->chandef.chan->band,
787 conn_flags, ifibss->bssid, &csa_ie);
788 /* can't switch to destination channel, fail */
792 /* did not contain a CSA */
796 /* channel switch is not supported, disconnect */
797 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
800 params.count = csa_ie.count;
801 params.chandef = csa_ie.chandef;
803 switch (ifibss->chandef.width) {
804 case NL80211_CHAN_WIDTH_20_NOHT:
805 case NL80211_CHAN_WIDTH_20:
806 case NL80211_CHAN_WIDTH_40:
807 /* keep our current HT mode (HT20/HT40+/HT40-), even if
808 * another mode has been announced. The mode is not adopted
809 * within the beacon while doing CSA and we should therefore
810 * keep the mode which we announce.
812 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
813 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan,
816 case NL80211_CHAN_WIDTH_5:
817 case NL80211_CHAN_WIDTH_10:
818 if (params.chandef.width != ifibss->chandef.width) {
820 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
822 params.chandef.chan->center_freq,
823 params.chandef.width,
824 params.chandef.center_freq1,
825 params.chandef.center_freq2);
830 /* should not happen, conn_flags should prevent VHT modes. */
835 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef,
836 NL80211_IFTYPE_ADHOC)) {
838 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
840 params.chandef.chan->center_freq,
841 params.chandef.width,
842 params.chandef.center_freq1,
843 params.chandef.center_freq2);
847 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
849 NL80211_IFTYPE_ADHOC);
852 if (err > 0 && !ifibss->userspace_handles_dfs) {
853 /* IBSS-DFS only allowed with a control program */
857 params.radar_required = err;
859 if (cfg80211_chandef_identical(¶ms.chandef,
860 &sdata->vif.bss_conf.chandef)) {
862 "received csa with an identical chandef, ignoring\n");
866 /* all checks done, now perform the channel switch. */
868 "received channel switch announcement to go to channel %d MHz\n",
869 params.chandef.chan->center_freq);
871 params.block_tx = !!csa_ie.mode;
873 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
877 ieee80211_ibss_csa_mark_radar(sdata);
881 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
882 wiphy_work_queue(sdata->local->hw.wiphy,
883 &ifibss->csa_connection_drop_work);
885 ieee80211_ibss_csa_mark_radar(sdata);
891 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
892 struct ieee80211_mgmt *mgmt, size_t len,
893 struct ieee80211_rx_status *rx_status,
894 struct ieee802_11_elems *elems)
898 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
901 /* CSA is the only action we handle for now */
902 if (mgmt->u.action.u.measurement.action_code !=
903 WLAN_ACTION_SPCT_CHL_SWITCH)
906 required_len = IEEE80211_MIN_ACTION_SIZE +
907 sizeof(mgmt->u.action.u.chan_switch);
908 if (len < required_len)
911 if (!sdata->vif.bss_conf.csa_active)
912 ieee80211_ibss_process_chanswitch(sdata, elems, false);
915 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
916 struct ieee80211_mgmt *mgmt,
919 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
921 if (len < IEEE80211_DEAUTH_FRAME_LEN)
924 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
925 ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason);
926 sta_info_destroy_addr(sdata, mgmt->sa);
929 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
930 struct ieee80211_mgmt *mgmt,
933 u16 auth_alg, auth_transaction;
935 lockdep_assert_wiphy(sdata->local->hw.wiphy);
940 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
941 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
943 ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
944 ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n",
945 mgmt->bssid, auth_transaction);
947 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
951 * IEEE 802.11 standard does not require authentication in IBSS
952 * networks and most implementations do not seem to use it.
953 * However, try to reply to authentication attempts if someone
954 * has actually implemented this.
956 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
957 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
960 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
961 struct ieee80211_mgmt *mgmt, size_t len,
962 struct ieee80211_rx_status *rx_status,
963 struct ieee802_11_elems *elems,
964 struct ieee80211_channel *channel)
966 struct sta_info *sta;
967 enum nl80211_band band = rx_status->band;
968 struct ieee80211_local *local = sdata->local;
969 struct ieee80211_supported_band *sband;
970 bool rates_updated = false;
973 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
976 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
979 sband = local->hw.wiphy->bands[band];
984 sta = sta_info_get(sdata, mgmt->sa);
986 if (elems->supp_rates) {
987 supp_rates = ieee80211_sta_get_rates(sdata, elems,
992 prev_rates = sta->sta.deflink.supp_rates[band];
994 sta->sta.deflink.supp_rates[band] = supp_rates |
995 ieee80211_mandatory_rates(sband);
996 if (sta->sta.deflink.supp_rates[band] != prev_rates) {
998 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
999 sta->sta.addr, prev_rates,
1000 sta->sta.deflink.supp_rates[band]);
1001 rates_updated = true;
1005 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1006 mgmt->sa, supp_rates);
1010 if (sta && !sta->sta.wme &&
1011 (elems->wmm_info || elems->s1g_capab) &&
1012 local->hw.queues >= IEEE80211_NUM_ACS) {
1013 sta->sta.wme = true;
1014 ieee80211_check_fast_xmit(sta);
1017 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1018 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1019 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1020 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1021 /* we both use HT */
1022 struct ieee80211_ht_cap htcap_ie;
1023 struct cfg80211_chan_def chandef;
1024 enum ieee80211_sta_rx_bandwidth bw = sta->sta.deflink.bandwidth;
1026 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT);
1027 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef);
1029 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1030 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1034 if (elems->vht_operation && elems->vht_cap_elem &&
1035 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1036 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1037 /* we both use VHT */
1038 struct ieee80211_vht_cap cap_ie;
1039 struct ieee80211_sta_vht_cap cap = sta->sta.deflink.vht_cap;
1041 le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
1043 ieee80211_chandef_vht_oper(&local->hw, vht_cap_info,
1044 elems->vht_operation,
1045 elems->ht_operation,
1047 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1048 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1051 if (memcmp(&cap, &sta->sta.deflink.vht_cap, sizeof(cap)))
1052 rates_updated |= true;
1055 if (bw != sta->sta.deflink.bandwidth)
1056 rates_updated |= true;
1058 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1063 if (sta && rates_updated) {
1064 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1065 u8 rx_nss = sta->sta.deflink.rx_nss;
1067 /* Force rx_nss recalculation */
1068 sta->sta.deflink.rx_nss = 0;
1069 rate_control_rate_init(sta);
1070 if (sta->sta.deflink.rx_nss != rx_nss)
1071 changed |= IEEE80211_RC_NSS_CHANGED;
1073 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1079 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1080 struct ieee80211_mgmt *mgmt, size_t len,
1081 struct ieee80211_rx_status *rx_status,
1082 struct ieee802_11_elems *elems)
1084 struct ieee80211_local *local = sdata->local;
1085 struct cfg80211_bss *cbss;
1086 struct ieee80211_bss *bss;
1087 struct ieee80211_channel *channel;
1088 u64 beacon_timestamp, rx_timestamp;
1090 enum nl80211_band band = rx_status->band;
1092 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1096 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1098 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel);
1102 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1104 /* same for beacon and probe response */
1105 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1107 /* check if we need to merge IBSS */
1110 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1113 /* different channel */
1114 if (sdata->u.ibss.fixed_channel &&
1115 sdata->u.ibss.chandef.chan != cbss->channel)
1118 /* different SSID */
1119 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1120 memcmp(elems->ssid, sdata->u.ibss.ssid,
1121 sdata->u.ibss.ssid_len))
1124 /* process channel switch */
1125 if (sdata->vif.bss_conf.csa_active ||
1126 ieee80211_ibss_process_chanswitch(sdata, elems, true))
1130 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1133 /* we use a fixed BSSID */
1134 if (sdata->u.ibss.fixed_bssid)
1137 if (ieee80211_have_rx_timestamp(rx_status)) {
1138 /* time when timestamp field was received */
1140 ieee80211_calculate_rx_timestamp(local, rx_status,
1144 * second best option: get current TSF
1145 * (will return -1 if not supported)
1147 rx_timestamp = drv_get_tsf(local, sdata);
1150 ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n",
1151 mgmt->sa, mgmt->bssid,
1152 (unsigned long long)rx_timestamp);
1153 ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n",
1154 (unsigned long long)beacon_timestamp,
1155 (unsigned long long)(rx_timestamp - beacon_timestamp),
1158 if (beacon_timestamp > rx_timestamp) {
1160 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1162 ieee80211_sta_join_ibss(sdata, bss);
1163 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1164 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1170 ieee80211_rx_bss_put(local, bss);
1173 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1174 const u8 *bssid, const u8 *addr,
1177 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1178 struct ieee80211_local *local = sdata->local;
1179 struct sta_info *sta;
1180 struct ieee80211_chanctx_conf *chanctx_conf;
1181 struct ieee80211_supported_band *sband;
1185 * XXX: Consider removing the least recently used entry and
1186 * allow new one to be added.
1188 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1189 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1194 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1197 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1201 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
1202 if (WARN_ON_ONCE(!chanctx_conf)) {
1206 band = chanctx_conf->def.chan->band;
1209 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1213 /* make sure mandatory rates are always added */
1214 sband = local->hw.wiphy->bands[band];
1215 sta->sta.deflink.supp_rates[band] = supp_rates |
1216 ieee80211_mandatory_rates(sband);
1218 spin_lock(&ifibss->incomplete_lock);
1219 list_add(&sta->list, &ifibss->incomplete_stations);
1220 spin_unlock(&ifibss->incomplete_lock);
1221 wiphy_work_queue(local->hw.wiphy, &sdata->work);
1224 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1226 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1227 struct ieee80211_local *local = sdata->local;
1228 struct sta_info *sta, *tmp;
1229 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1230 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1232 lockdep_assert_wiphy(local->hw.wiphy);
1234 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1235 unsigned long last_active = ieee80211_sta_last_active(sta);
1237 if (sdata != sta->sdata)
1240 if (time_is_before_jiffies(last_active + exp_time) ||
1241 (time_is_before_jiffies(last_active + exp_rsn) &&
1242 sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1243 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
1245 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1246 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1247 "not authorized " : "", sta->sta.addr);
1249 ieee80211_send_deauth_disassoc(sdata, sta->sta.addr,
1251 IEEE80211_STYPE_DEAUTH,
1252 WLAN_REASON_DEAUTH_LEAVING,
1254 WARN_ON(__sta_info_destroy(sta));
1260 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1263 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1265 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1267 lockdep_assert_wiphy(sdata->local->hw.wiphy);
1269 mod_timer(&ifibss->timer,
1270 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1272 ieee80211_ibss_sta_expire(sdata);
1274 if (time_before(jiffies, ifibss->last_scan_completed +
1275 IEEE80211_IBSS_MERGE_INTERVAL))
1278 if (ieee80211_sta_active_ibss(sdata))
1281 if (ifibss->fixed_channel)
1285 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1287 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1291 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1293 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1298 lockdep_assert_wiphy(sdata->local->hw.wiphy);
1300 if (ifibss->fixed_bssid) {
1301 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1303 /* Generate random, not broadcast, locally administered BSSID. Mix in
1304 * own MAC address to make sure that devices that do not have proper
1305 * random number generator get different BSSID. */
1306 get_random_bytes(bssid, ETH_ALEN);
1307 for (i = 0; i < ETH_ALEN; i++)
1308 bssid[i] ^= sdata->vif.addr[i];
1313 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1315 capability = WLAN_CAPABILITY_IBSS;
1317 if (ifibss->privacy)
1318 capability |= WLAN_CAPABILITY_PRIVACY;
1320 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1321 &ifibss->chandef, ifibss->basic_rates,
1322 capability, 0, true);
1325 static unsigned int ibss_setup_channels(struct wiphy *wiphy,
1326 struct ieee80211_channel **channels,
1327 unsigned int channels_max,
1328 u32 center_freq, u32 width)
1330 struct ieee80211_channel *chan = NULL;
1331 unsigned int n_chan = 0;
1332 u32 start_freq, end_freq, freq;
1335 start_freq = center_freq;
1336 end_freq = center_freq;
1338 start_freq = center_freq - width / 2 + 10;
1339 end_freq = center_freq + width / 2 - 10;
1342 for (freq = start_freq; freq <= end_freq; freq += 20) {
1343 chan = ieee80211_get_channel(wiphy, freq);
1346 if (n_chan >= channels_max)
1349 channels[n_chan] = chan;
1357 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1358 const struct cfg80211_chan_def *chandef,
1359 struct ieee80211_channel **channels,
1360 unsigned int channels_max)
1362 unsigned int n_chan = 0;
1363 u32 width, cf1, cf2 = 0;
1365 switch (chandef->width) {
1366 case NL80211_CHAN_WIDTH_40:
1369 case NL80211_CHAN_WIDTH_80P80:
1370 cf2 = chandef->center_freq2;
1372 case NL80211_CHAN_WIDTH_80:
1375 case NL80211_CHAN_WIDTH_160:
1383 cf1 = chandef->center_freq1;
1385 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1388 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1389 channels_max - n_chan, cf2,
1396 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1399 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1401 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1402 struct ieee80211_local *local = sdata->local;
1403 struct cfg80211_bss *cbss;
1404 struct ieee80211_channel *chan = NULL;
1405 const u8 *bssid = NULL;
1408 lockdep_assert_wiphy(sdata->local->hw.wiphy);
1410 active_ibss = ieee80211_sta_active_ibss(sdata);
1411 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1416 if (ifibss->fixed_bssid)
1417 bssid = ifibss->bssid;
1418 if (ifibss->fixed_channel)
1419 chan = ifibss->chandef.chan;
1420 if (!is_zero_ether_addr(ifibss->bssid))
1421 bssid = ifibss->bssid;
1422 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1423 ifibss->ssid, ifibss->ssid_len,
1424 IEEE80211_BSS_TYPE_IBSS,
1425 IEEE80211_PRIVACY(ifibss->privacy));
1428 struct ieee80211_bss *bss;
1430 bss = (void *)cbss->priv;
1432 "sta_find_ibss: selected %pM current %pM\n",
1433 cbss->bssid, ifibss->bssid);
1435 "Selected IBSS BSSID %pM based on configured SSID\n",
1438 ieee80211_sta_join_ibss(sdata, bss);
1439 ieee80211_rx_bss_put(local, bss);
1443 /* if a fixed bssid and a fixed freq have been provided create the IBSS
1444 * directly and do not waste time scanning
1446 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1447 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1449 ieee80211_sta_create_ibss(sdata);
1454 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1456 /* Selected IBSS not found in current scan results - try to scan */
1457 if (time_after(jiffies, ifibss->last_scan_completed +
1458 IEEE80211_SCAN_INTERVAL)) {
1459 struct ieee80211_channel *channels[8];
1462 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1464 if (ifibss->fixed_channel) {
1465 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1468 ARRAY_SIZE(channels));
1469 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1470 ifibss->ssid_len, channels,
1473 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1474 ifibss->ssid_len, NULL, 0);
1477 int interval = IEEE80211_SCAN_INTERVAL;
1479 if (time_after(jiffies, ifibss->ibss_join_req +
1480 IEEE80211_IBSS_JOIN_TIMEOUT))
1481 ieee80211_sta_create_ibss(sdata);
1483 mod_timer(&ifibss->timer,
1484 round_jiffies(jiffies + interval));
1488 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1489 struct sk_buff *req)
1491 struct ieee80211_mgmt *mgmt = (void *)req->data;
1492 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1493 struct ieee80211_local *local = sdata->local;
1494 int tx_last_beacon, len = req->len;
1495 struct sk_buff *skb;
1496 struct beacon_data *presp;
1499 lockdep_assert_wiphy(sdata->local->hw.wiphy);
1501 presp = sdata_dereference(ifibss->presp, sdata);
1503 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1504 len < 24 + 2 || !presp)
1507 tx_last_beacon = drv_tx_last_beacon(local);
1509 ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
1510 ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n",
1511 mgmt->bssid, tx_last_beacon);
1513 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1516 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1517 !is_broadcast_ether_addr(mgmt->bssid))
1520 end = ((u8 *) mgmt) + len;
1521 pos = mgmt->u.probe_req.variable;
1522 if (pos[0] != WLAN_EID_SSID ||
1523 pos + 2 + pos[1] > end) {
1524 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1529 (pos[1] != ifibss->ssid_len ||
1530 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1531 /* Ignore ProbeReq for foreign SSID */
1535 /* Reply with ProbeResp */
1536 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1540 skb_reserve(skb, local->tx_headroom);
1541 skb_put_data(skb, presp->head, presp->head_len);
1543 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1544 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1545 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1547 /* avoid excessive retries for probe request to wildcard SSIDs */
1549 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1551 ieee80211_tx_skb(sdata, skb);
1555 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1556 struct ieee80211_mgmt *mgmt, size_t len,
1557 struct ieee80211_rx_status *rx_status)
1560 struct ieee802_11_elems *elems;
1562 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1563 offsetof(typeof(mgmt->u.beacon), variable));
1566 * either beacon or probe_resp but the variable field is at the
1569 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1573 elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable,
1574 len - baselen, false, NULL);
1577 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, elems);
1582 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1583 struct sk_buff *skb)
1585 struct ieee80211_rx_status *rx_status;
1586 struct ieee80211_mgmt *mgmt;
1588 struct ieee802_11_elems *elems;
1591 rx_status = IEEE80211_SKB_RXCB(skb);
1592 mgmt = (struct ieee80211_mgmt *) skb->data;
1593 fc = le16_to_cpu(mgmt->frame_control);
1595 if (!sdata->u.ibss.ssid_len)
1596 return; /* not ready to merge yet */
1598 switch (fc & IEEE80211_FCTL_STYPE) {
1599 case IEEE80211_STYPE_PROBE_REQ:
1600 ieee80211_rx_mgmt_probe_req(sdata, skb);
1602 case IEEE80211_STYPE_PROBE_RESP:
1603 case IEEE80211_STYPE_BEACON:
1604 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1607 case IEEE80211_STYPE_AUTH:
1608 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1610 case IEEE80211_STYPE_DEAUTH:
1611 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1613 case IEEE80211_STYPE_ACTION:
1614 switch (mgmt->u.action.category) {
1615 case WLAN_CATEGORY_SPECTRUM_MGMT:
1616 ies_len = skb->len -
1617 offsetof(struct ieee80211_mgmt,
1618 u.action.u.chan_switch.variable);
1623 elems = ieee802_11_parse_elems(
1624 mgmt->u.action.u.chan_switch.variable,
1625 ies_len, true, NULL);
1627 if (elems && !elems->parse_error)
1628 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt,
1638 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1640 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1641 struct sta_info *sta;
1644 * Work could be scheduled after scan or similar
1645 * when we aren't even joined (or trying) with a
1648 if (!ifibss->ssid_len)
1651 spin_lock_bh(&ifibss->incomplete_lock);
1652 while (!list_empty(&ifibss->incomplete_stations)) {
1653 sta = list_first_entry(&ifibss->incomplete_stations,
1654 struct sta_info, list);
1655 list_del(&sta->list);
1656 spin_unlock_bh(&ifibss->incomplete_lock);
1658 ieee80211_ibss_finish_sta(sta);
1660 spin_lock_bh(&ifibss->incomplete_lock);
1662 spin_unlock_bh(&ifibss->incomplete_lock);
1664 switch (ifibss->state) {
1665 case IEEE80211_IBSS_MLME_SEARCH:
1666 ieee80211_sta_find_ibss(sdata);
1668 case IEEE80211_IBSS_MLME_JOINED:
1669 ieee80211_sta_merge_ibss(sdata);
1677 static void ieee80211_ibss_timer(struct timer_list *t)
1679 struct ieee80211_sub_if_data *sdata =
1680 from_timer(sdata, t, u.ibss.timer);
1682 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
1685 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1687 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1689 timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0);
1690 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1691 spin_lock_init(&ifibss->incomplete_lock);
1692 wiphy_work_init(&ifibss->csa_connection_drop_work,
1693 ieee80211_csa_connection_drop_work);
1696 /* scan finished notification */
1697 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1699 struct ieee80211_sub_if_data *sdata;
1701 lockdep_assert_wiphy(local->hw.wiphy);
1703 list_for_each_entry(sdata, &local->interfaces, list) {
1704 if (!ieee80211_sdata_running(sdata))
1706 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1708 sdata->u.ibss.last_scan_completed = jiffies;
1712 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1713 struct cfg80211_ibss_params *params)
1717 struct ieee80211_supported_band *sband;
1718 enum ieee80211_chanctx_mode chanmode;
1719 struct ieee80211_local *local = sdata->local;
1720 int radar_detect_width = 0;
1724 lockdep_assert_wiphy(local->hw.wiphy);
1726 if (params->chandef.chan->freq_offset) {
1727 /* this may work, but is untested */
1731 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1733 sdata->wdev.iftype);
1738 if (!params->userspace_handles_dfs)
1740 radar_detect_width = BIT(params->chandef.width);
1743 chanmode = (params->channel_fixed && !ret) ?
1744 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1746 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode,
1747 radar_detect_width);
1751 if (params->bssid) {
1752 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1753 sdata->u.ibss.fixed_bssid = true;
1755 sdata->u.ibss.fixed_bssid = false;
1757 sdata->u.ibss.privacy = params->privacy;
1758 sdata->u.ibss.control_port = params->control_port;
1759 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1760 sdata->u.ibss.basic_rates = params->basic_rates;
1761 sdata->u.ibss.last_scan_completed = jiffies;
1763 /* fix basic_rates if channel does not support these rates */
1764 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef);
1765 sband = local->hw.wiphy->bands[params->chandef.chan->band];
1766 for (i = 0; i < sband->n_bitrates; i++) {
1767 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1768 sdata->u.ibss.basic_rates &= ~BIT(i);
1770 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1771 sizeof(params->mcast_rate));
1773 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1775 sdata->u.ibss.chandef = params->chandef;
1776 sdata->u.ibss.fixed_channel = params->channel_fixed;
1779 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1781 if (sdata->u.ibss.ie)
1782 sdata->u.ibss.ie_len = params->ie_len;
1785 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1786 sdata->u.ibss.ibss_join_req = jiffies;
1788 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1789 sdata->u.ibss.ssid_len = params->ssid_len;
1791 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa,
1792 sizeof(sdata->u.ibss.ht_capa));
1793 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask,
1794 sizeof(sdata->u.ibss.ht_capa_mask));
1797 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1798 * reserved, but an HT STA shall protect HT transmissions as though
1799 * the HT Protection field were set to non-HT mixed mode.
1801 * In an IBSS, the RIFS Mode field of the HT Operation element is
1802 * also reserved, but an HT STA shall operate as though this field
1806 sdata->vif.bss_conf.ht_operation_mode |=
1807 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1808 | IEEE80211_HT_PARAM_RIFS_MODE;
1810 changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE;
1811 ieee80211_link_info_change_notify(sdata, &sdata->deflink, changed);
1813 sdata->deflink.smps_mode = IEEE80211_SMPS_OFF;
1814 sdata->deflink.needed_rx_chains = local->rx_chains;
1815 sdata->control_port_over_nl80211 = params->control_port_over_nl80211;
1817 wiphy_work_queue(local->hw.wiphy, &sdata->work);
1822 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1824 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1826 ieee80211_ibss_disconnect(sdata);
1827 ifibss->ssid_len = 0;
1828 eth_zero_addr(ifibss->bssid);
1831 kfree(sdata->u.ibss.ie);
1832 sdata->u.ibss.ie = NULL;
1833 sdata->u.ibss.ie_len = 0;
1835 /* on the next join, re-program HT parameters */
1836 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1837 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1841 skb_queue_purge(&sdata->skb_queue);
1843 del_timer_sync(&sdata->u.ibss.timer);