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>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
15 #include <linux/delay.h>
16 #include <linux/slab.h>
17 #include <linux/if_ether.h>
18 #include <linux/skbuff.h>
19 #include <linux/if_arp.h>
20 #include <linux/etherdevice.h>
21 #include <linux/rtnetlink.h>
22 #include <net/mac80211.h>
24 #include "ieee80211_i.h"
25 #include "driver-ops.h"
28 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
29 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
31 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
32 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
33 #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ)
35 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
37 static struct beacon_data *
38 ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata,
39 const int beacon_int, const u32 basic_rates,
40 const u16 capability, u64 tsf,
41 struct cfg80211_chan_def *chandef,
42 bool *have_higher_than_11mbit,
43 struct cfg80211_csa_settings *csa_settings)
45 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
46 struct ieee80211_local *local = sdata->local;
47 int rates_n = 0, i, ri;
48 struct ieee80211_mgmt *mgmt;
50 struct ieee80211_supported_band *sband;
51 u32 rate_flags, rates = 0, rates_added = 0;
52 struct beacon_data *presp;
56 /* Build IBSS probe response */
57 frame_len = sizeof(struct ieee80211_hdr_3addr) +
58 12 /* struct ieee80211_mgmt.u.beacon */ +
59 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
60 2 + 8 /* max Supported Rates */ +
61 3 /* max DS params */ +
63 5 /* Channel Switch Announcement */ +
64 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
65 2 + sizeof(struct ieee80211_ht_cap) +
66 2 + sizeof(struct ieee80211_ht_operation) +
68 presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
72 presp->head = (void *)(presp + 1);
74 mgmt = (void *) presp->head;
75 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
76 IEEE80211_STYPE_PROBE_RESP);
77 eth_broadcast_addr(mgmt->da);
78 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
79 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
80 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
81 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
82 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
84 pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
86 *pos++ = WLAN_EID_SSID;
87 *pos++ = ifibss->ssid_len;
88 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
89 pos += ifibss->ssid_len;
91 sband = local->hw.wiphy->bands[chandef->chan->band];
92 rate_flags = ieee80211_chandef_rate_flags(chandef);
93 shift = ieee80211_chandef_get_shift(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,
115 if (!(rates & BIT(ri)))
118 if (basic_rates & BIT(ri))
120 *pos++ = basic | (u8) rate;
121 if (++rates_added == 8) {
122 ri++; /* continue at next rate for EXT_SUPP_RATES */
127 if (sband->band == IEEE80211_BAND_2GHZ) {
128 *pos++ = WLAN_EID_DS_PARAMS;
130 *pos++ = ieee80211_frequency_to_channel(
131 chandef->chan->center_freq);
134 *pos++ = WLAN_EID_IBSS_PARAMS;
136 /* FIX: set ATIM window based on scan results */
141 *pos++ = WLAN_EID_CHANNEL_SWITCH;
143 *pos++ = csa_settings->block_tx ? 1 : 0;
144 *pos++ = ieee80211_frequency_to_channel(
145 csa_settings->chandef.chan->center_freq);
146 sdata->csa_counter_offset_beacon = (pos - presp->head);
147 *pos++ = 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,
158 if (!(rates & BIT(ri)))
161 if (basic_rates & BIT(ri))
163 *pos++ = basic | (u8) rate;
167 if (ifibss->ie_len) {
168 memcpy(pos, ifibss->ie, ifibss->ie_len);
169 pos += ifibss->ie_len;
172 /* add HT capability and information IEs */
173 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
174 chandef->width != NL80211_CHAN_WIDTH_5 &&
175 chandef->width != NL80211_CHAN_WIDTH_10 &&
176 sband->ht_cap.ht_supported) {
177 struct ieee80211_sta_ht_cap ht_cap;
179 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
180 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
182 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
184 * Note: According to 802.11n-2009 9.13.3.1, HT Protection
185 * field and RIFS Mode are reserved in IBSS mode, therefore
188 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
192 if (local->hw.queues >= IEEE80211_NUM_ACS) {
193 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
194 *pos++ = 7; /* len */
195 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
198 *pos++ = 2; /* WME */
199 *pos++ = 0; /* WME info */
200 *pos++ = 1; /* WME ver */
201 *pos++ = 0; /* U-APSD no 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_supported_band *sband;
224 struct ieee80211_mgmt *mgmt;
225 struct cfg80211_bss *bss;
227 struct cfg80211_chan_def chandef;
228 struct ieee80211_channel *chan;
229 struct beacon_data *presp;
230 enum nl80211_bss_scan_width scan_width;
231 bool have_higher_than_11mbit;
232 bool radar_required = false;
235 sdata_assert_lock(sdata);
237 /* Reset own TSF to allow time synchronization work. */
238 drv_reset_tsf(local, sdata);
240 if (!ether_addr_equal(ifibss->bssid, bssid))
241 sta_info_flush(sdata);
243 /* if merging, indicate to driver that we leave the old IBSS */
244 if (sdata->vif.bss_conf.ibss_joined) {
245 sdata->vif.bss_conf.ibss_joined = false;
246 sdata->vif.bss_conf.ibss_creator = false;
247 sdata->vif.bss_conf.enable_beacon = false;
248 netif_carrier_off(sdata->dev);
249 ieee80211_bss_info_change_notify(sdata,
251 BSS_CHANGED_BEACON_ENABLED);
252 drv_leave_ibss(local, sdata);
255 presp = rcu_dereference_protected(ifibss->presp,
256 lockdep_is_held(&sdata->wdev.mtx));
257 rcu_assign_pointer(ifibss->presp, NULL);
259 kfree_rcu(presp, rcu_head);
261 sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
263 /* make a copy of the chandef, it could be modified below. */
264 chandef = *req_chandef;
266 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) {
267 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
268 chandef.width == NL80211_CHAN_WIDTH_10 ||
269 chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
270 chandef.width == NL80211_CHAN_WIDTH_20) {
272 "Failed to join IBSS, beacons forbidden\n");
275 chandef.width = NL80211_CHAN_WIDTH_20;
276 chandef.center_freq1 = chan->center_freq;
277 /* check again for downgraded chandef */
278 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) {
280 "Failed to join IBSS, beacons forbidden\n");
285 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
288 if (!ifibss->userspace_handles_dfs) {
290 "Failed to join IBSS, DFS channel without control program\n");
293 radar_required = true;
296 mutex_lock(&local->mtx);
297 ieee80211_vif_release_channel(sdata);
298 if (ieee80211_vif_use_channel(sdata, &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");
303 mutex_unlock(&local->mtx);
306 mutex_unlock(&local->mtx);
308 memcpy(ifibss->bssid, bssid, ETH_ALEN);
310 sband = local->hw.wiphy->bands[chan->band];
312 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
313 capability, tsf, &chandef,
314 &have_higher_than_11mbit, NULL);
318 rcu_assign_pointer(ifibss->presp, presp);
319 mgmt = (void *)presp->head;
321 sdata->radar_required = radar_required;
322 sdata->vif.bss_conf.enable_beacon = true;
323 sdata->vif.bss_conf.beacon_int = beacon_int;
324 sdata->vif.bss_conf.basic_rates = basic_rates;
325 sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
326 memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
327 bss_change = BSS_CHANGED_BEACON_INT;
328 bss_change |= ieee80211_reset_erp_info(sdata);
329 bss_change |= BSS_CHANGED_BSSID;
330 bss_change |= BSS_CHANGED_BEACON;
331 bss_change |= BSS_CHANGED_BEACON_ENABLED;
332 bss_change |= BSS_CHANGED_BASIC_RATES;
333 bss_change |= BSS_CHANGED_HT;
334 bss_change |= BSS_CHANGED_IBSS;
335 bss_change |= BSS_CHANGED_SSID;
338 * In 5 GHz/802.11a, we can always use short slot time.
339 * (IEEE 802.11-2012 18.3.8.7)
341 * In 2.4GHz, we must always use long slots in IBSS for compatibility
343 * (IEEE 802.11-2012 19.4.5)
345 * HT follows these specifications (IEEE 802.11-2012 20.3.18)
347 sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ;
348 bss_change |= BSS_CHANGED_ERP_SLOT;
350 /* cf. IEEE 802.11 9.2.12 */
351 if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit)
352 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
354 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
356 ieee80211_set_wmm_default(sdata, true);
358 sdata->vif.bss_conf.ibss_joined = true;
359 sdata->vif.bss_conf.ibss_creator = creator;
361 err = drv_join_ibss(local, sdata);
363 sdata->vif.bss_conf.ibss_joined = false;
364 sdata->vif.bss_conf.ibss_creator = false;
365 sdata->vif.bss_conf.enable_beacon = false;
366 sdata->vif.bss_conf.ssid_len = 0;
367 RCU_INIT_POINTER(ifibss->presp, NULL);
368 kfree_rcu(presp, rcu_head);
369 mutex_lock(&local->mtx);
370 ieee80211_vif_release_channel(sdata);
371 mutex_unlock(&local->mtx);
372 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
377 ieee80211_bss_info_change_notify(sdata, bss_change);
379 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
380 mod_timer(&ifibss->timer,
381 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
383 scan_width = cfg80211_chandef_to_scan_width(&chandef);
384 bss = cfg80211_inform_bss_width_frame(local->hw.wiphy, chan,
386 presp->head_len, 0, GFP_KERNEL);
387 cfg80211_put_bss(local->hw.wiphy, bss);
388 netif_carrier_on(sdata->dev);
389 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
392 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
393 struct ieee80211_bss *bss)
395 struct cfg80211_bss *cbss =
396 container_of((void *)bss, struct cfg80211_bss, priv);
397 struct ieee80211_supported_band *sband;
398 struct cfg80211_chan_def chandef;
401 u16 beacon_int = cbss->beacon_interval;
402 const struct cfg80211_bss_ies *ies;
403 enum nl80211_channel_type chan_type;
408 sdata_assert_lock(sdata);
413 switch (sdata->u.ibss.chandef.width) {
414 case NL80211_CHAN_WIDTH_20_NOHT:
415 case NL80211_CHAN_WIDTH_20:
416 case NL80211_CHAN_WIDTH_40:
417 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
418 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
420 case NL80211_CHAN_WIDTH_5:
421 case NL80211_CHAN_WIDTH_10:
422 cfg80211_chandef_create(&chandef, cbss->channel,
423 NL80211_CHAN_WIDTH_20_NOHT);
424 chandef.width = sdata->u.ibss.chandef.width;
427 /* fall back to 20 MHz for unsupported modes */
428 cfg80211_chandef_create(&chandef, cbss->channel,
429 NL80211_CHAN_WIDTH_20_NOHT);
433 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
434 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
435 shift = ieee80211_vif_get_shift(&sdata->vif);
439 for (i = 0; i < bss->supp_rates_len; i++) {
440 int rate = bss->supp_rates[i] & 0x7f;
441 bool is_basic = !!(bss->supp_rates[i] & 0x80);
443 for (j = 0; j < sband->n_bitrates; j++) {
445 if ((rate_flags & sband->bitrates[j].flags)
449 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
453 basic_rates |= BIT(j);
460 ies = rcu_dereference(cbss->ies);
464 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
472 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
473 struct cfg80211_csa_settings *csa_settings)
475 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
476 struct beacon_data *presp, *old_presp;
477 struct cfg80211_bss *cbss;
478 const struct cfg80211_bss_ies *ies;
483 sdata_assert_lock(sdata);
485 capability = WLAN_CAPABILITY_IBSS;
488 capability |= WLAN_CAPABILITY_PRIVACY;
490 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
491 ifibss->bssid, ifibss->ssid,
492 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
493 WLAN_CAPABILITY_PRIVACY,
496 if (WARN_ON(!cbss)) {
502 ies = rcu_dereference(cbss->ies);
505 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
507 old_presp = rcu_dereference_protected(ifibss->presp,
508 lockdep_is_held(&sdata->wdev.mtx));
510 presp = ieee80211_ibss_build_presp(sdata,
511 sdata->vif.bss_conf.beacon_int,
512 sdata->vif.bss_conf.basic_rates,
513 capability, tsf, &ifibss->chandef,
520 rcu_assign_pointer(ifibss->presp, presp);
522 kfree_rcu(old_presp, rcu_head);
524 /* it might not send the beacon for a while. send an action frame
525 * immediately to announce the channel switch.
528 ieee80211_send_action_csa(sdata, csa_settings);
530 return BSS_CHANGED_BEACON;
535 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
537 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
538 struct cfg80211_bss *cbss;
542 sdata_assert_lock(sdata);
544 /* update cfg80211 bss information with the new channel */
545 if (!is_zero_ether_addr(ifibss->bssid)) {
546 capability = WLAN_CAPABILITY_IBSS;
549 capability |= WLAN_CAPABILITY_PRIVACY;
551 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
552 ifibss->chandef.chan,
553 ifibss->bssid, ifibss->ssid,
554 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
555 WLAN_CAPABILITY_PRIVACY,
557 /* XXX: should not really modify cfg80211 data */
559 cbss->channel = sdata->csa_chandef.chan;
560 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
564 ifibss->chandef = sdata->csa_chandef;
566 /* generate the beacon */
567 err = ieee80211_ibss_csa_beacon(sdata, NULL);
572 ieee80211_bss_info_change_notify(sdata, err);
577 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
579 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
581 cancel_work_sync(&ifibss->csa_connection_drop_work);
584 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
587 struct ieee80211_sub_if_data *sdata = sta->sdata;
590 memcpy(addr, sta->sta.addr, ETH_ALEN);
592 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
594 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
595 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
596 /* authorize the station only if the network is not RSN protected. If
597 * not wait for the userspace to authorize it */
598 if (!sta->sdata->u.ibss.control_port)
599 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
601 rate_control_rate_init(sta);
603 /* If it fails, maybe we raced another insertion? */
604 if (sta_info_insert_rcu(sta))
605 return sta_info_get(sdata, addr);
609 static struct sta_info *
610 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
611 const u8 *addr, u32 supp_rates)
614 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
615 struct ieee80211_local *local = sdata->local;
616 struct sta_info *sta;
617 struct ieee80211_chanctx_conf *chanctx_conf;
618 struct ieee80211_supported_band *sband;
619 enum nl80211_bss_scan_width scan_width;
623 * XXX: Consider removing the least recently used entry and
624 * allow new one to be added.
626 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
627 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
633 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
638 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
644 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
645 if (WARN_ON_ONCE(!chanctx_conf))
647 band = chanctx_conf->def.chan->band;
648 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
651 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
657 sta->last_rx = jiffies;
659 /* make sure mandatory rates are always added */
660 sband = local->hw.wiphy->bands[band];
661 sta->sta.supp_rates[band] = supp_rates |
662 ieee80211_mandatory_rates(sband, scan_width);
664 return ieee80211_ibss_finish_sta(sta);
667 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
669 struct ieee80211_local *local = sdata->local;
671 struct sta_info *sta;
673 sdata_assert_lock(sdata);
677 list_for_each_entry_rcu(sta, &local->sta_list, list) {
678 if (sta->sdata == sdata &&
679 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
691 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
693 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
694 struct ieee80211_local *local = sdata->local;
695 struct cfg80211_bss *cbss;
696 struct beacon_data *presp;
697 struct sta_info *sta;
701 active_ibss = ieee80211_sta_active_ibss(sdata);
703 if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) {
704 capability = WLAN_CAPABILITY_IBSS;
707 capability |= WLAN_CAPABILITY_PRIVACY;
709 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
710 ifibss->bssid, ifibss->ssid,
711 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
712 WLAN_CAPABILITY_PRIVACY,
716 cfg80211_unlink_bss(local->hw.wiphy, cbss);
717 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
721 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
723 sta_info_flush(sdata);
725 spin_lock_bh(&ifibss->incomplete_lock);
726 while (!list_empty(&ifibss->incomplete_stations)) {
727 sta = list_first_entry(&ifibss->incomplete_stations,
728 struct sta_info, list);
729 list_del(&sta->list);
730 spin_unlock_bh(&ifibss->incomplete_lock);
732 sta_info_free(local, sta);
733 spin_lock_bh(&ifibss->incomplete_lock);
735 spin_unlock_bh(&ifibss->incomplete_lock);
737 netif_carrier_off(sdata->dev);
739 sdata->vif.bss_conf.ibss_joined = false;
740 sdata->vif.bss_conf.ibss_creator = false;
741 sdata->vif.bss_conf.enable_beacon = false;
742 sdata->vif.bss_conf.ssid_len = 0;
745 presp = rcu_dereference_protected(ifibss->presp,
746 lockdep_is_held(&sdata->wdev.mtx));
747 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
749 kfree_rcu(presp, rcu_head);
751 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
752 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
754 drv_leave_ibss(local, sdata);
755 mutex_lock(&local->mtx);
756 ieee80211_vif_release_channel(sdata);
757 mutex_unlock(&local->mtx);
760 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
762 struct ieee80211_sub_if_data *sdata =
763 container_of(work, struct ieee80211_sub_if_data,
764 u.ibss.csa_connection_drop_work);
768 ieee80211_ibss_disconnect(sdata);
770 skb_queue_purge(&sdata->skb_queue);
772 /* trigger a scan to find another IBSS network to join */
773 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
778 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
780 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
783 /* if the current channel is a DFS channel, mark the channel as
786 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
789 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
794 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
795 struct ieee802_11_elems *elems,
798 struct cfg80211_csa_settings params;
799 struct ieee80211_csa_ie csa_ie;
800 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
801 enum nl80211_channel_type ch_type;
805 sta_flags = IEEE80211_STA_DISABLE_VHT;
806 switch (ifibss->chandef.width) {
807 case NL80211_CHAN_WIDTH_5:
808 case NL80211_CHAN_WIDTH_10:
809 case NL80211_CHAN_WIDTH_20_NOHT:
810 sta_flags |= IEEE80211_STA_DISABLE_HT;
812 case NL80211_CHAN_WIDTH_20:
813 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
819 memset(¶ms, 0, sizeof(params));
820 memset(&csa_ie, 0, sizeof(csa_ie));
821 err = ieee80211_parse_ch_switch_ie(sdata, elems, beacon,
822 ifibss->chandef.chan->band,
823 sta_flags, ifibss->bssid, &csa_ie);
824 /* can't switch to destination channel, fail */
828 /* did not contain a CSA */
832 /* channel switch is not supported, disconnect */
833 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
836 params.count = csa_ie.count;
837 params.chandef = csa_ie.chandef;
839 switch (ifibss->chandef.width) {
840 case NL80211_CHAN_WIDTH_20_NOHT:
841 case NL80211_CHAN_WIDTH_20:
842 case NL80211_CHAN_WIDTH_40:
843 /* keep our current HT mode (HT20/HT40+/HT40-), even if
844 * another mode has been announced. The mode is not adopted
845 * within the beacon while doing CSA and we should therefore
846 * keep the mode which we announce.
848 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
849 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan,
852 case NL80211_CHAN_WIDTH_5:
853 case NL80211_CHAN_WIDTH_10:
854 if (params.chandef.width != ifibss->chandef.width) {
856 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
858 params.chandef.chan->center_freq,
859 params.chandef.width,
860 params.chandef.center_freq1,
861 params.chandef.center_freq2);
866 /* should not happen, sta_flags should prevent VHT modes. */
871 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef)) {
873 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
875 params.chandef.chan->center_freq,
876 params.chandef.width,
877 params.chandef.center_freq1,
878 params.chandef.center_freq2);
882 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
887 /* IBSS-DFS only allowed with a control program */
888 if (!ifibss->userspace_handles_dfs)
891 params.radar_required = true;
894 if (cfg80211_chandef_identical(¶ms.chandef,
895 &sdata->vif.bss_conf.chandef)) {
897 "received csa with an identical chandef, ignoring\n");
901 /* all checks done, now perform the channel switch. */
903 "received channel switch announcement to go to channel %d MHz\n",
904 params.chandef.chan->center_freq);
906 params.block_tx = !!csa_ie.mode;
908 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
912 ieee80211_ibss_csa_mark_radar(sdata);
916 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
917 ieee80211_queue_work(&sdata->local->hw,
918 &ifibss->csa_connection_drop_work);
920 ieee80211_ibss_csa_mark_radar(sdata);
926 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
927 struct ieee80211_mgmt *mgmt, size_t len,
928 struct ieee80211_rx_status *rx_status,
929 struct ieee802_11_elems *elems)
933 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
936 /* CSA is the only action we handle for now */
937 if (mgmt->u.action.u.measurement.action_code !=
938 WLAN_ACTION_SPCT_CHL_SWITCH)
941 required_len = IEEE80211_MIN_ACTION_SIZE +
942 sizeof(mgmt->u.action.u.chan_switch);
943 if (len < required_len)
946 if (!sdata->vif.csa_active)
947 ieee80211_ibss_process_chanswitch(sdata, elems, false);
950 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
951 struct ieee80211_mgmt *mgmt,
954 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
956 if (len < IEEE80211_DEAUTH_FRAME_LEN)
959 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
960 mgmt->sa, mgmt->da, mgmt->bssid, reason);
961 sta_info_destroy_addr(sdata, mgmt->sa);
964 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
965 struct ieee80211_mgmt *mgmt,
968 u16 auth_alg, auth_transaction;
970 sdata_assert_lock(sdata);
975 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
976 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
979 "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
980 mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
982 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
986 * IEEE 802.11 standard does not require authentication in IBSS
987 * networks and most implementations do not seem to use it.
988 * However, try to reply to authentication attempts if someone
989 * has actually implemented this.
991 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
992 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
995 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
996 struct ieee80211_mgmt *mgmt, size_t len,
997 struct ieee80211_rx_status *rx_status,
998 struct ieee802_11_elems *elems)
1000 struct ieee80211_local *local = sdata->local;
1002 struct cfg80211_bss *cbss;
1003 struct ieee80211_bss *bss;
1004 struct sta_info *sta;
1005 struct ieee80211_channel *channel;
1006 u64 beacon_timestamp, rx_timestamp;
1008 enum ieee80211_band band = rx_status->band;
1009 enum nl80211_bss_scan_width scan_width;
1010 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
1011 bool rates_updated = false;
1013 if (elems->ds_params)
1014 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
1017 freq = rx_status->freq;
1019 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1021 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1024 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1025 ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) {
1028 sta = sta_info_get(sdata, mgmt->sa);
1030 if (elems->supp_rates) {
1031 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1036 prev_rates = sta->sta.supp_rates[band];
1037 /* make sure mandatory rates are always added */
1038 scan_width = NL80211_BSS_CHAN_WIDTH_20;
1039 if (rx_status->flag & RX_FLAG_5MHZ)
1040 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1041 if (rx_status->flag & RX_FLAG_10MHZ)
1042 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1044 sta->sta.supp_rates[band] = supp_rates |
1045 ieee80211_mandatory_rates(sband,
1047 if (sta->sta.supp_rates[band] != prev_rates) {
1049 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1050 sta->sta.addr, prev_rates,
1051 sta->sta.supp_rates[band]);
1052 rates_updated = true;
1056 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1057 mgmt->sa, supp_rates);
1061 if (sta && elems->wmm_info)
1062 set_sta_flag(sta, WLAN_STA_WME);
1064 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1065 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1066 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1067 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1068 /* we both use HT */
1069 struct ieee80211_ht_cap htcap_ie;
1070 struct cfg80211_chan_def chandef;
1072 ieee80211_ht_oper_to_chandef(channel,
1073 elems->ht_operation,
1076 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1079 * fall back to HT20 if we don't use or use
1080 * the other extension channel
1082 if (chandef.center_freq1 !=
1083 sdata->u.ibss.chandef.center_freq1)
1084 htcap_ie.cap_info &=
1085 cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40);
1087 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(
1088 sdata, sband, &htcap_ie, sta);
1091 if (sta && rates_updated) {
1092 drv_sta_rc_update(local, sdata, &sta->sta,
1093 IEEE80211_RC_SUPP_RATES_CHANGED);
1094 rate_control_rate_init(sta);
1100 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1105 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1107 /* same for beacon and probe response */
1108 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1110 /* check if we need to merge IBSS */
1113 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1116 /* different channel */
1117 if (sdata->u.ibss.fixed_channel &&
1118 sdata->u.ibss.chandef.chan != cbss->channel)
1121 /* different SSID */
1122 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1123 memcmp(elems->ssid, sdata->u.ibss.ssid,
1124 sdata->u.ibss.ssid_len))
1127 /* process channel switch */
1128 if (sdata->vif.csa_active ||
1129 ieee80211_ibss_process_chanswitch(sdata, elems, true))
1133 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1136 /* we use a fixed BSSID */
1137 if (sdata->u.ibss.fixed_bssid)
1140 if (ieee80211_have_rx_timestamp(rx_status)) {
1141 /* time when timestamp field was received */
1143 ieee80211_calculate_rx_timestamp(local, rx_status,
1147 * second best option: get current TSF
1148 * (will return -1 if not supported)
1150 rx_timestamp = drv_get_tsf(local, sdata);
1154 "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1155 mgmt->sa, mgmt->bssid,
1156 (unsigned long long)rx_timestamp,
1157 (unsigned long long)beacon_timestamp,
1158 (unsigned long long)(rx_timestamp - beacon_timestamp),
1161 if (beacon_timestamp > rx_timestamp) {
1163 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1165 ieee80211_sta_join_ibss(sdata, bss);
1166 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1167 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1173 ieee80211_rx_bss_put(local, bss);
1176 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1177 const u8 *bssid, const u8 *addr,
1180 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1181 struct ieee80211_local *local = sdata->local;
1182 struct sta_info *sta;
1183 struct ieee80211_chanctx_conf *chanctx_conf;
1184 struct ieee80211_supported_band *sband;
1185 enum nl80211_bss_scan_width scan_width;
1189 * XXX: Consider removing the least recently used entry and
1190 * allow new one to be added.
1192 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1193 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1198 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1201 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1205 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1206 if (WARN_ON_ONCE(!chanctx_conf)) {
1210 band = chanctx_conf->def.chan->band;
1211 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1214 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1218 sta->last_rx = jiffies;
1220 /* make sure mandatory rates are always added */
1221 sband = local->hw.wiphy->bands[band];
1222 sta->sta.supp_rates[band] = supp_rates |
1223 ieee80211_mandatory_rates(sband, scan_width);
1225 spin_lock(&ifibss->incomplete_lock);
1226 list_add(&sta->list, &ifibss->incomplete_stations);
1227 spin_unlock(&ifibss->incomplete_lock);
1228 ieee80211_queue_work(&local->hw, &sdata->work);
1231 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1233 struct ieee80211_local *local = sdata->local;
1234 struct sta_info *sta, *tmp;
1235 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1236 unsigned long exp_rsn_time = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1238 mutex_lock(&local->sta_mtx);
1240 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1241 if (sdata != sta->sdata)
1244 if (time_after(jiffies, sta->last_rx + exp_time) ||
1245 (time_after(jiffies, sta->last_rx + exp_rsn_time) &&
1246 sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1247 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1248 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1249 "not authorized " : "", sta->sta.addr);
1251 WARN_ON(__sta_info_destroy(sta));
1255 mutex_unlock(&local->sta_mtx);
1259 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1262 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1264 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1265 enum nl80211_bss_scan_width scan_width;
1267 sdata_assert_lock(sdata);
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 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1288 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1292 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1294 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1299 sdata_assert_lock(sdata);
1301 if (ifibss->fixed_bssid) {
1302 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1304 /* Generate random, not broadcast, locally administered BSSID. Mix in
1305 * own MAC address to make sure that devices that do not have proper
1306 * random number generator get different BSSID. */
1307 get_random_bytes(bssid, ETH_ALEN);
1308 for (i = 0; i < ETH_ALEN; i++)
1309 bssid[i] ^= sdata->vif.addr[i];
1314 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1316 capability = WLAN_CAPABILITY_IBSS;
1318 if (ifibss->privacy)
1319 capability |= WLAN_CAPABILITY_PRIVACY;
1321 sdata->drop_unencrypted = 0;
1323 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1324 &ifibss->chandef, ifibss->basic_rates,
1325 capability, 0, true);
1329 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1332 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1334 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1335 struct ieee80211_local *local = sdata->local;
1336 struct cfg80211_bss *cbss;
1337 struct ieee80211_channel *chan = NULL;
1338 const u8 *bssid = NULL;
1339 enum nl80211_bss_scan_width scan_width;
1343 sdata_assert_lock(sdata);
1345 active_ibss = ieee80211_sta_active_ibss(sdata);
1346 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1351 capability = WLAN_CAPABILITY_IBSS;
1352 if (ifibss->privacy)
1353 capability |= WLAN_CAPABILITY_PRIVACY;
1354 if (ifibss->fixed_bssid)
1355 bssid = ifibss->bssid;
1356 if (ifibss->fixed_channel)
1357 chan = ifibss->chandef.chan;
1358 if (!is_zero_ether_addr(ifibss->bssid))
1359 bssid = ifibss->bssid;
1360 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1361 ifibss->ssid, ifibss->ssid_len,
1362 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
1366 struct ieee80211_bss *bss;
1368 bss = (void *)cbss->priv;
1370 "sta_find_ibss: selected %pM current %pM\n",
1371 cbss->bssid, ifibss->bssid);
1373 "Selected IBSS BSSID %pM based on configured SSID\n",
1376 ieee80211_sta_join_ibss(sdata, bss);
1377 ieee80211_rx_bss_put(local, bss);
1381 /* if a fixed bssid and a fixed freq have been provided create the IBSS
1382 * directly and do not waste time scanning
1384 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1385 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1387 ieee80211_sta_create_ibss(sdata);
1392 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1394 /* Selected IBSS not found in current scan results - try to scan */
1395 if (time_after(jiffies, ifibss->last_scan_completed +
1396 IEEE80211_SCAN_INTERVAL)) {
1397 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1399 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1400 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1401 ifibss->ssid_len, chan,
1404 int interval = IEEE80211_SCAN_INTERVAL;
1406 if (time_after(jiffies, ifibss->ibss_join_req +
1407 IEEE80211_IBSS_JOIN_TIMEOUT))
1408 ieee80211_sta_create_ibss(sdata);
1410 mod_timer(&ifibss->timer,
1411 round_jiffies(jiffies + interval));
1415 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1416 struct sk_buff *req)
1418 struct ieee80211_mgmt *mgmt = (void *)req->data;
1419 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1420 struct ieee80211_local *local = sdata->local;
1421 int tx_last_beacon, len = req->len;
1422 struct sk_buff *skb;
1423 struct beacon_data *presp;
1426 sdata_assert_lock(sdata);
1428 presp = rcu_dereference_protected(ifibss->presp,
1429 lockdep_is_held(&sdata->wdev.mtx));
1431 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1432 len < 24 + 2 || !presp)
1435 tx_last_beacon = drv_tx_last_beacon(local);
1438 "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
1439 mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
1441 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1444 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1445 !is_broadcast_ether_addr(mgmt->bssid))
1448 end = ((u8 *) mgmt) + len;
1449 pos = mgmt->u.probe_req.variable;
1450 if (pos[0] != WLAN_EID_SSID ||
1451 pos + 2 + pos[1] > end) {
1452 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1457 (pos[1] != ifibss->ssid_len ||
1458 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1459 /* Ignore ProbeReq for foreign SSID */
1463 /* Reply with ProbeResp */
1464 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1468 skb_reserve(skb, local->tx_headroom);
1469 memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
1471 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1472 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1473 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1474 ieee80211_tx_skb(sdata, skb);
1478 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1479 struct ieee80211_mgmt *mgmt, size_t len,
1480 struct ieee80211_rx_status *rx_status)
1483 struct ieee802_11_elems elems;
1485 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1486 offsetof(typeof(mgmt->u.beacon), variable));
1489 * either beacon or probe_resp but the variable field is at the
1492 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1496 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1499 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1502 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1503 struct sk_buff *skb)
1505 struct ieee80211_rx_status *rx_status;
1506 struct ieee80211_mgmt *mgmt;
1508 struct ieee802_11_elems elems;
1511 rx_status = IEEE80211_SKB_RXCB(skb);
1512 mgmt = (struct ieee80211_mgmt *) skb->data;
1513 fc = le16_to_cpu(mgmt->frame_control);
1517 if (!sdata->u.ibss.ssid_len)
1518 goto mgmt_out; /* not ready to merge yet */
1520 switch (fc & IEEE80211_FCTL_STYPE) {
1521 case IEEE80211_STYPE_PROBE_REQ:
1522 ieee80211_rx_mgmt_probe_req(sdata, skb);
1524 case IEEE80211_STYPE_PROBE_RESP:
1525 case IEEE80211_STYPE_BEACON:
1526 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1529 case IEEE80211_STYPE_AUTH:
1530 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1532 case IEEE80211_STYPE_DEAUTH:
1533 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1535 case IEEE80211_STYPE_ACTION:
1536 switch (mgmt->u.action.category) {
1537 case WLAN_CATEGORY_SPECTRUM_MGMT:
1538 ies_len = skb->len -
1539 offsetof(struct ieee80211_mgmt,
1540 u.action.u.chan_switch.variable);
1545 ieee802_11_parse_elems(
1546 mgmt->u.action.u.chan_switch.variable,
1547 ies_len, true, &elems);
1549 if (elems.parse_error)
1552 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1559 sdata_unlock(sdata);
1562 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1564 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1565 struct sta_info *sta;
1570 * Work could be scheduled after scan or similar
1571 * when we aren't even joined (or trying) with a
1574 if (!ifibss->ssid_len)
1577 spin_lock_bh(&ifibss->incomplete_lock);
1578 while (!list_empty(&ifibss->incomplete_stations)) {
1579 sta = list_first_entry(&ifibss->incomplete_stations,
1580 struct sta_info, list);
1581 list_del(&sta->list);
1582 spin_unlock_bh(&ifibss->incomplete_lock);
1584 ieee80211_ibss_finish_sta(sta);
1586 spin_lock_bh(&ifibss->incomplete_lock);
1588 spin_unlock_bh(&ifibss->incomplete_lock);
1590 switch (ifibss->state) {
1591 case IEEE80211_IBSS_MLME_SEARCH:
1592 ieee80211_sta_find_ibss(sdata);
1594 case IEEE80211_IBSS_MLME_JOINED:
1595 ieee80211_sta_merge_ibss(sdata);
1603 sdata_unlock(sdata);
1606 static void ieee80211_ibss_timer(unsigned long data)
1608 struct ieee80211_sub_if_data *sdata =
1609 (struct ieee80211_sub_if_data *) data;
1611 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1614 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1616 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1618 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1619 (unsigned long) sdata);
1620 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1621 spin_lock_init(&ifibss->incomplete_lock);
1622 INIT_WORK(&ifibss->csa_connection_drop_work,
1623 ieee80211_csa_connection_drop_work);
1626 /* scan finished notification */
1627 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1629 struct ieee80211_sub_if_data *sdata;
1631 mutex_lock(&local->iflist_mtx);
1632 list_for_each_entry(sdata, &local->interfaces, list) {
1633 if (!ieee80211_sdata_running(sdata))
1635 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1637 sdata->u.ibss.last_scan_completed = jiffies;
1638 ieee80211_queue_work(&local->hw, &sdata->work);
1640 mutex_unlock(&local->iflist_mtx);
1643 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1644 struct cfg80211_ibss_params *params)
1648 struct ieee80211_supported_band *sband;
1651 if (params->bssid) {
1652 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1653 sdata->u.ibss.fixed_bssid = true;
1655 sdata->u.ibss.fixed_bssid = false;
1657 sdata->u.ibss.privacy = params->privacy;
1658 sdata->u.ibss.control_port = params->control_port;
1659 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1660 sdata->u.ibss.basic_rates = params->basic_rates;
1662 /* fix basic_rates if channel does not support these rates */
1663 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef);
1664 sband = sdata->local->hw.wiphy->bands[params->chandef.chan->band];
1665 for (i = 0; i < sband->n_bitrates; i++) {
1666 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1667 sdata->u.ibss.basic_rates &= ~BIT(i);
1669 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1670 sizeof(params->mcast_rate));
1672 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1674 sdata->u.ibss.chandef = params->chandef;
1675 sdata->u.ibss.fixed_channel = params->channel_fixed;
1678 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1680 if (sdata->u.ibss.ie)
1681 sdata->u.ibss.ie_len = params->ie_len;
1684 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1685 sdata->u.ibss.ibss_join_req = jiffies;
1687 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1688 sdata->u.ibss.ssid_len = params->ssid_len;
1690 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa,
1691 sizeof(sdata->u.ibss.ht_capa));
1692 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask,
1693 sizeof(sdata->u.ibss.ht_capa_mask));
1696 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1697 * reserved, but an HT STA shall protect HT transmissions as though
1698 * the HT Protection field were set to non-HT mixed mode.
1700 * In an IBSS, the RIFS Mode field of the HT Operation element is
1701 * also reserved, but an HT STA shall operate as though this field
1705 sdata->vif.bss_conf.ht_operation_mode |=
1706 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1707 | IEEE80211_HT_PARAM_RIFS_MODE;
1709 changed |= BSS_CHANGED_HT;
1710 ieee80211_bss_info_change_notify(sdata, changed);
1712 sdata->smps_mode = IEEE80211_SMPS_OFF;
1713 sdata->needed_rx_chains = sdata->local->rx_chains;
1715 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1720 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1722 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1724 ieee80211_ibss_disconnect(sdata);
1725 ifibss->ssid_len = 0;
1726 memset(ifibss->bssid, 0, ETH_ALEN);
1729 kfree(sdata->u.ibss.ie);
1731 /* on the next join, re-program HT parameters */
1732 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1733 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1737 skb_queue_purge(&sdata->skb_queue);
1739 del_timer_sync(&sdata->u.ibss.timer);