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 return BSS_CHANGED_BEACON;
529 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
531 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
532 struct cfg80211_bss *cbss;
536 sdata_assert_lock(sdata);
538 /* update cfg80211 bss information with the new channel */
539 if (!is_zero_ether_addr(ifibss->bssid)) {
540 capability = WLAN_CAPABILITY_IBSS;
543 capability |= WLAN_CAPABILITY_PRIVACY;
545 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
546 ifibss->chandef.chan,
547 ifibss->bssid, ifibss->ssid,
548 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
549 WLAN_CAPABILITY_PRIVACY,
551 /* XXX: should not really modify cfg80211 data */
553 cbss->channel = sdata->csa_chandef.chan;
554 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
558 ifibss->chandef = sdata->csa_chandef;
560 /* generate the beacon */
561 err = ieee80211_ibss_csa_beacon(sdata, NULL);
566 ieee80211_bss_info_change_notify(sdata, err);
571 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
573 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
575 cancel_work_sync(&ifibss->csa_connection_drop_work);
578 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
581 struct ieee80211_sub_if_data *sdata = sta->sdata;
584 memcpy(addr, sta->sta.addr, ETH_ALEN);
586 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
588 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
589 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
590 /* authorize the station only if the network is not RSN protected. If
591 * not wait for the userspace to authorize it */
592 if (!sta->sdata->u.ibss.control_port)
593 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
595 rate_control_rate_init(sta);
597 /* If it fails, maybe we raced another insertion? */
598 if (sta_info_insert_rcu(sta))
599 return sta_info_get(sdata, addr);
603 static struct sta_info *
604 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
605 const u8 *addr, u32 supp_rates)
608 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
609 struct ieee80211_local *local = sdata->local;
610 struct sta_info *sta;
611 struct ieee80211_chanctx_conf *chanctx_conf;
612 struct ieee80211_supported_band *sband;
613 enum nl80211_bss_scan_width scan_width;
617 * XXX: Consider removing the least recently used entry and
618 * allow new one to be added.
620 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
621 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
627 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
632 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
638 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
639 if (WARN_ON_ONCE(!chanctx_conf))
641 band = chanctx_conf->def.chan->band;
642 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
645 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
651 sta->last_rx = jiffies;
653 /* make sure mandatory rates are always added */
654 sband = local->hw.wiphy->bands[band];
655 sta->sta.supp_rates[band] = supp_rates |
656 ieee80211_mandatory_rates(sband, scan_width);
658 return ieee80211_ibss_finish_sta(sta);
661 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
663 struct ieee80211_local *local = sdata->local;
665 struct sta_info *sta;
667 sdata_assert_lock(sdata);
671 list_for_each_entry_rcu(sta, &local->sta_list, list) {
672 if (sta->sdata == sdata &&
673 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
685 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
687 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
688 struct ieee80211_local *local = sdata->local;
689 struct cfg80211_bss *cbss;
690 struct beacon_data *presp;
691 struct sta_info *sta;
695 active_ibss = ieee80211_sta_active_ibss(sdata);
697 if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) {
698 capability = WLAN_CAPABILITY_IBSS;
701 capability |= WLAN_CAPABILITY_PRIVACY;
703 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
704 ifibss->bssid, ifibss->ssid,
705 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
706 WLAN_CAPABILITY_PRIVACY,
710 cfg80211_unlink_bss(local->hw.wiphy, cbss);
711 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
715 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
717 sta_info_flush(sdata);
719 spin_lock_bh(&ifibss->incomplete_lock);
720 while (!list_empty(&ifibss->incomplete_stations)) {
721 sta = list_first_entry(&ifibss->incomplete_stations,
722 struct sta_info, list);
723 list_del(&sta->list);
724 spin_unlock_bh(&ifibss->incomplete_lock);
726 sta_info_free(local, sta);
727 spin_lock_bh(&ifibss->incomplete_lock);
729 spin_unlock_bh(&ifibss->incomplete_lock);
731 netif_carrier_off(sdata->dev);
733 sdata->vif.bss_conf.ibss_joined = false;
734 sdata->vif.bss_conf.ibss_creator = false;
735 sdata->vif.bss_conf.enable_beacon = false;
736 sdata->vif.bss_conf.ssid_len = 0;
739 presp = rcu_dereference_protected(ifibss->presp,
740 lockdep_is_held(&sdata->wdev.mtx));
741 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
743 kfree_rcu(presp, rcu_head);
745 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
746 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
748 drv_leave_ibss(local, sdata);
749 mutex_lock(&local->mtx);
750 ieee80211_vif_release_channel(sdata);
751 mutex_unlock(&local->mtx);
754 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
756 struct ieee80211_sub_if_data *sdata =
757 container_of(work, struct ieee80211_sub_if_data,
758 u.ibss.csa_connection_drop_work);
762 ieee80211_ibss_disconnect(sdata);
764 skb_queue_purge(&sdata->skb_queue);
766 /* trigger a scan to find another IBSS network to join */
767 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
772 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
774 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
777 /* if the current channel is a DFS channel, mark the channel as
780 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
783 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
788 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
789 struct ieee802_11_elems *elems,
792 struct cfg80211_csa_settings params;
793 struct ieee80211_csa_ie csa_ie;
794 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
795 enum nl80211_channel_type ch_type;
799 sta_flags = IEEE80211_STA_DISABLE_VHT;
800 switch (ifibss->chandef.width) {
801 case NL80211_CHAN_WIDTH_5:
802 case NL80211_CHAN_WIDTH_10:
803 case NL80211_CHAN_WIDTH_20_NOHT:
804 sta_flags |= IEEE80211_STA_DISABLE_HT;
806 case NL80211_CHAN_WIDTH_20:
807 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
813 memset(¶ms, 0, sizeof(params));
814 memset(&csa_ie, 0, sizeof(csa_ie));
815 err = ieee80211_parse_ch_switch_ie(sdata, elems, beacon,
816 ifibss->chandef.chan->band,
817 sta_flags, ifibss->bssid, &csa_ie);
818 /* can't switch to destination channel, fail */
822 /* did not contain a CSA */
826 /* channel switch is not supported, disconnect */
827 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
830 params.count = csa_ie.count;
831 params.chandef = csa_ie.chandef;
833 switch (ifibss->chandef.width) {
834 case NL80211_CHAN_WIDTH_20_NOHT:
835 case NL80211_CHAN_WIDTH_20:
836 case NL80211_CHAN_WIDTH_40:
837 /* keep our current HT mode (HT20/HT40+/HT40-), even if
838 * another mode has been announced. The mode is not adopted
839 * within the beacon while doing CSA and we should therefore
840 * keep the mode which we announce.
842 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
843 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan,
846 case NL80211_CHAN_WIDTH_5:
847 case NL80211_CHAN_WIDTH_10:
848 if (params.chandef.width != ifibss->chandef.width) {
850 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
852 params.chandef.chan->center_freq,
853 params.chandef.width,
854 params.chandef.center_freq1,
855 params.chandef.center_freq2);
860 /* should not happen, sta_flags should prevent VHT modes. */
865 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef)) {
867 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
869 params.chandef.chan->center_freq,
870 params.chandef.width,
871 params.chandef.center_freq1,
872 params.chandef.center_freq2);
876 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
881 /* IBSS-DFS only allowed with a control program */
882 if (!ifibss->userspace_handles_dfs)
885 params.radar_required = true;
888 if (cfg80211_chandef_identical(¶ms.chandef,
889 &sdata->vif.bss_conf.chandef)) {
891 "received csa with an identical chandef, ignoring\n");
895 /* all checks done, now perform the channel switch. */
897 "received channel switch announcement to go to channel %d MHz\n",
898 params.chandef.chan->center_freq);
900 params.block_tx = !!csa_ie.mode;
902 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
906 ieee80211_ibss_csa_mark_radar(sdata);
910 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
911 ieee80211_queue_work(&sdata->local->hw,
912 &ifibss->csa_connection_drop_work);
914 ieee80211_ibss_csa_mark_radar(sdata);
920 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
921 struct ieee80211_mgmt *mgmt, size_t len,
922 struct ieee80211_rx_status *rx_status,
923 struct ieee802_11_elems *elems)
927 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
930 /* CSA is the only action we handle for now */
931 if (mgmt->u.action.u.measurement.action_code !=
932 WLAN_ACTION_SPCT_CHL_SWITCH)
935 required_len = IEEE80211_MIN_ACTION_SIZE +
936 sizeof(mgmt->u.action.u.chan_switch);
937 if (len < required_len)
940 if (!sdata->vif.csa_active)
941 ieee80211_ibss_process_chanswitch(sdata, elems, false);
944 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
945 struct ieee80211_mgmt *mgmt,
948 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
950 if (len < IEEE80211_DEAUTH_FRAME_LEN)
953 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
954 mgmt->sa, mgmt->da, mgmt->bssid, reason);
955 sta_info_destroy_addr(sdata, mgmt->sa);
958 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
959 struct ieee80211_mgmt *mgmt,
962 u16 auth_alg, auth_transaction;
964 sdata_assert_lock(sdata);
969 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
970 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
973 "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
974 mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
976 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
980 * IEEE 802.11 standard does not require authentication in IBSS
981 * networks and most implementations do not seem to use it.
982 * However, try to reply to authentication attempts if someone
983 * has actually implemented this.
985 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
986 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
989 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
990 struct ieee80211_mgmt *mgmt, size_t len,
991 struct ieee80211_rx_status *rx_status,
992 struct ieee802_11_elems *elems)
994 struct ieee80211_local *local = sdata->local;
996 struct cfg80211_bss *cbss;
997 struct ieee80211_bss *bss;
998 struct sta_info *sta;
999 struct ieee80211_channel *channel;
1000 u64 beacon_timestamp, rx_timestamp;
1002 enum ieee80211_band band = rx_status->band;
1003 enum nl80211_bss_scan_width scan_width;
1004 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
1005 bool rates_updated = false;
1007 if (elems->ds_params)
1008 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
1011 freq = rx_status->freq;
1013 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1015 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1018 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1019 ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) {
1022 sta = sta_info_get(sdata, mgmt->sa);
1024 if (elems->supp_rates) {
1025 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1030 prev_rates = sta->sta.supp_rates[band];
1031 /* make sure mandatory rates are always added */
1032 scan_width = NL80211_BSS_CHAN_WIDTH_20;
1033 if (rx_status->flag & RX_FLAG_5MHZ)
1034 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1035 if (rx_status->flag & RX_FLAG_10MHZ)
1036 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1038 sta->sta.supp_rates[band] = supp_rates |
1039 ieee80211_mandatory_rates(sband,
1041 if (sta->sta.supp_rates[band] != prev_rates) {
1043 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1044 sta->sta.addr, prev_rates,
1045 sta->sta.supp_rates[band]);
1046 rates_updated = true;
1050 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1051 mgmt->sa, supp_rates);
1055 if (sta && elems->wmm_info)
1056 set_sta_flag(sta, WLAN_STA_WME);
1058 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1059 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1060 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1061 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1062 /* we both use HT */
1063 struct ieee80211_ht_cap htcap_ie;
1064 struct cfg80211_chan_def chandef;
1066 ieee80211_ht_oper_to_chandef(channel,
1067 elems->ht_operation,
1070 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1073 * fall back to HT20 if we don't use or use
1074 * the other extension channel
1076 if (chandef.center_freq1 !=
1077 sdata->u.ibss.chandef.center_freq1)
1078 htcap_ie.cap_info &=
1079 cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40);
1081 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(
1082 sdata, sband, &htcap_ie, sta);
1085 if (sta && rates_updated) {
1086 drv_sta_rc_update(local, sdata, &sta->sta,
1087 IEEE80211_RC_SUPP_RATES_CHANGED);
1088 rate_control_rate_init(sta);
1094 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1099 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1101 /* same for beacon and probe response */
1102 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1104 /* check if we need to merge IBSS */
1107 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1110 /* different channel */
1111 if (sdata->u.ibss.fixed_channel &&
1112 sdata->u.ibss.chandef.chan != cbss->channel)
1115 /* different SSID */
1116 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1117 memcmp(elems->ssid, sdata->u.ibss.ssid,
1118 sdata->u.ibss.ssid_len))
1121 /* process channel switch */
1122 if (sdata->vif.csa_active ||
1123 ieee80211_ibss_process_chanswitch(sdata, elems, true))
1127 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1130 /* we use a fixed BSSID */
1131 if (sdata->u.ibss.fixed_bssid)
1134 if (ieee80211_have_rx_timestamp(rx_status)) {
1135 /* time when timestamp field was received */
1137 ieee80211_calculate_rx_timestamp(local, rx_status,
1141 * second best option: get current TSF
1142 * (will return -1 if not supported)
1144 rx_timestamp = drv_get_tsf(local, sdata);
1148 "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1149 mgmt->sa, mgmt->bssid,
1150 (unsigned long long)rx_timestamp,
1151 (unsigned long long)beacon_timestamp,
1152 (unsigned long long)(rx_timestamp - beacon_timestamp),
1155 if (beacon_timestamp > rx_timestamp) {
1157 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1159 ieee80211_sta_join_ibss(sdata, bss);
1160 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1161 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1167 ieee80211_rx_bss_put(local, bss);
1170 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1171 const u8 *bssid, const u8 *addr,
1174 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1175 struct ieee80211_local *local = sdata->local;
1176 struct sta_info *sta;
1177 struct ieee80211_chanctx_conf *chanctx_conf;
1178 struct ieee80211_supported_band *sband;
1179 enum nl80211_bss_scan_width scan_width;
1183 * XXX: Consider removing the least recently used entry and
1184 * allow new one to be added.
1186 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1187 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1192 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1195 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1199 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1200 if (WARN_ON_ONCE(!chanctx_conf)) {
1204 band = chanctx_conf->def.chan->band;
1205 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1208 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1212 sta->last_rx = jiffies;
1214 /* make sure mandatory rates are always added */
1215 sband = local->hw.wiphy->bands[band];
1216 sta->sta.supp_rates[band] = supp_rates |
1217 ieee80211_mandatory_rates(sband, scan_width);
1219 spin_lock(&ifibss->incomplete_lock);
1220 list_add(&sta->list, &ifibss->incomplete_stations);
1221 spin_unlock(&ifibss->incomplete_lock);
1222 ieee80211_queue_work(&local->hw, &sdata->work);
1225 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
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_time = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1232 mutex_lock(&local->sta_mtx);
1234 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1235 if (sdata != sta->sdata)
1238 if (time_after(jiffies, sta->last_rx + exp_time) ||
1239 (time_after(jiffies, sta->last_rx + exp_rsn_time) &&
1240 sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1241 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1242 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1243 "not authorized " : "", sta->sta.addr);
1245 WARN_ON(__sta_info_destroy(sta));
1249 mutex_unlock(&local->sta_mtx);
1253 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1256 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1258 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1259 enum nl80211_bss_scan_width scan_width;
1261 sdata_assert_lock(sdata);
1263 mod_timer(&ifibss->timer,
1264 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1266 ieee80211_ibss_sta_expire(sdata);
1268 if (time_before(jiffies, ifibss->last_scan_completed +
1269 IEEE80211_IBSS_MERGE_INTERVAL))
1272 if (ieee80211_sta_active_ibss(sdata))
1275 if (ifibss->fixed_channel)
1279 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1281 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1282 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1286 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1288 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1293 sdata_assert_lock(sdata);
1295 if (ifibss->fixed_bssid) {
1296 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1298 /* Generate random, not broadcast, locally administered BSSID. Mix in
1299 * own MAC address to make sure that devices that do not have proper
1300 * random number generator get different BSSID. */
1301 get_random_bytes(bssid, ETH_ALEN);
1302 for (i = 0; i < ETH_ALEN; i++)
1303 bssid[i] ^= sdata->vif.addr[i];
1308 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1310 capability = WLAN_CAPABILITY_IBSS;
1312 if (ifibss->privacy)
1313 capability |= WLAN_CAPABILITY_PRIVACY;
1315 sdata->drop_unencrypted = 0;
1317 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1318 &ifibss->chandef, ifibss->basic_rates,
1319 capability, 0, true);
1323 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1326 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1328 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1329 struct ieee80211_local *local = sdata->local;
1330 struct cfg80211_bss *cbss;
1331 struct ieee80211_channel *chan = NULL;
1332 const u8 *bssid = NULL;
1333 enum nl80211_bss_scan_width scan_width;
1337 sdata_assert_lock(sdata);
1339 active_ibss = ieee80211_sta_active_ibss(sdata);
1340 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1345 capability = WLAN_CAPABILITY_IBSS;
1346 if (ifibss->privacy)
1347 capability |= WLAN_CAPABILITY_PRIVACY;
1348 if (ifibss->fixed_bssid)
1349 bssid = ifibss->bssid;
1350 if (ifibss->fixed_channel)
1351 chan = ifibss->chandef.chan;
1352 if (!is_zero_ether_addr(ifibss->bssid))
1353 bssid = ifibss->bssid;
1354 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1355 ifibss->ssid, ifibss->ssid_len,
1356 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
1360 struct ieee80211_bss *bss;
1362 bss = (void *)cbss->priv;
1364 "sta_find_ibss: selected %pM current %pM\n",
1365 cbss->bssid, ifibss->bssid);
1367 "Selected IBSS BSSID %pM based on configured SSID\n",
1370 ieee80211_sta_join_ibss(sdata, bss);
1371 ieee80211_rx_bss_put(local, bss);
1375 /* if a fixed bssid and a fixed freq have been provided create the IBSS
1376 * directly and do not waste time scanning
1378 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1379 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1381 ieee80211_sta_create_ibss(sdata);
1386 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1388 /* Selected IBSS not found in current scan results - try to scan */
1389 if (time_after(jiffies, ifibss->last_scan_completed +
1390 IEEE80211_SCAN_INTERVAL)) {
1391 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1393 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1394 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1395 ifibss->ssid_len, chan,
1398 int interval = IEEE80211_SCAN_INTERVAL;
1400 if (time_after(jiffies, ifibss->ibss_join_req +
1401 IEEE80211_IBSS_JOIN_TIMEOUT))
1402 ieee80211_sta_create_ibss(sdata);
1404 mod_timer(&ifibss->timer,
1405 round_jiffies(jiffies + interval));
1409 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1410 struct sk_buff *req)
1412 struct ieee80211_mgmt *mgmt = (void *)req->data;
1413 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1414 struct ieee80211_local *local = sdata->local;
1415 int tx_last_beacon, len = req->len;
1416 struct sk_buff *skb;
1417 struct beacon_data *presp;
1420 sdata_assert_lock(sdata);
1422 presp = rcu_dereference_protected(ifibss->presp,
1423 lockdep_is_held(&sdata->wdev.mtx));
1425 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1426 len < 24 + 2 || !presp)
1429 tx_last_beacon = drv_tx_last_beacon(local);
1432 "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
1433 mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
1435 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1438 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1439 !is_broadcast_ether_addr(mgmt->bssid))
1442 end = ((u8 *) mgmt) + len;
1443 pos = mgmt->u.probe_req.variable;
1444 if (pos[0] != WLAN_EID_SSID ||
1445 pos + 2 + pos[1] > end) {
1446 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1451 (pos[1] != ifibss->ssid_len ||
1452 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1453 /* Ignore ProbeReq for foreign SSID */
1457 /* Reply with ProbeResp */
1458 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1462 skb_reserve(skb, local->tx_headroom);
1463 memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
1465 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1466 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1467 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1468 ieee80211_tx_skb(sdata, skb);
1472 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1473 struct ieee80211_mgmt *mgmt, size_t len,
1474 struct ieee80211_rx_status *rx_status)
1477 struct ieee802_11_elems elems;
1479 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1480 offsetof(typeof(mgmt->u.beacon), variable));
1483 * either beacon or probe_resp but the variable field is at the
1486 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1490 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1493 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1496 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1497 struct sk_buff *skb)
1499 struct ieee80211_rx_status *rx_status;
1500 struct ieee80211_mgmt *mgmt;
1502 struct ieee802_11_elems elems;
1505 rx_status = IEEE80211_SKB_RXCB(skb);
1506 mgmt = (struct ieee80211_mgmt *) skb->data;
1507 fc = le16_to_cpu(mgmt->frame_control);
1511 if (!sdata->u.ibss.ssid_len)
1512 goto mgmt_out; /* not ready to merge yet */
1514 switch (fc & IEEE80211_FCTL_STYPE) {
1515 case IEEE80211_STYPE_PROBE_REQ:
1516 ieee80211_rx_mgmt_probe_req(sdata, skb);
1518 case IEEE80211_STYPE_PROBE_RESP:
1519 case IEEE80211_STYPE_BEACON:
1520 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1523 case IEEE80211_STYPE_AUTH:
1524 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1526 case IEEE80211_STYPE_DEAUTH:
1527 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1529 case IEEE80211_STYPE_ACTION:
1530 switch (mgmt->u.action.category) {
1531 case WLAN_CATEGORY_SPECTRUM_MGMT:
1532 ies_len = skb->len -
1533 offsetof(struct ieee80211_mgmt,
1534 u.action.u.chan_switch.variable);
1539 ieee802_11_parse_elems(
1540 mgmt->u.action.u.chan_switch.variable,
1541 ies_len, true, &elems);
1543 if (elems.parse_error)
1546 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1553 sdata_unlock(sdata);
1556 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1558 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1559 struct sta_info *sta;
1564 * Work could be scheduled after scan or similar
1565 * when we aren't even joined (or trying) with a
1568 if (!ifibss->ssid_len)
1571 spin_lock_bh(&ifibss->incomplete_lock);
1572 while (!list_empty(&ifibss->incomplete_stations)) {
1573 sta = list_first_entry(&ifibss->incomplete_stations,
1574 struct sta_info, list);
1575 list_del(&sta->list);
1576 spin_unlock_bh(&ifibss->incomplete_lock);
1578 ieee80211_ibss_finish_sta(sta);
1580 spin_lock_bh(&ifibss->incomplete_lock);
1582 spin_unlock_bh(&ifibss->incomplete_lock);
1584 switch (ifibss->state) {
1585 case IEEE80211_IBSS_MLME_SEARCH:
1586 ieee80211_sta_find_ibss(sdata);
1588 case IEEE80211_IBSS_MLME_JOINED:
1589 ieee80211_sta_merge_ibss(sdata);
1597 sdata_unlock(sdata);
1600 static void ieee80211_ibss_timer(unsigned long data)
1602 struct ieee80211_sub_if_data *sdata =
1603 (struct ieee80211_sub_if_data *) data;
1605 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1608 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1610 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1612 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1613 (unsigned long) sdata);
1614 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1615 spin_lock_init(&ifibss->incomplete_lock);
1616 INIT_WORK(&ifibss->csa_connection_drop_work,
1617 ieee80211_csa_connection_drop_work);
1620 /* scan finished notification */
1621 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1623 struct ieee80211_sub_if_data *sdata;
1625 mutex_lock(&local->iflist_mtx);
1626 list_for_each_entry(sdata, &local->interfaces, list) {
1627 if (!ieee80211_sdata_running(sdata))
1629 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1631 sdata->u.ibss.last_scan_completed = jiffies;
1632 ieee80211_queue_work(&local->hw, &sdata->work);
1634 mutex_unlock(&local->iflist_mtx);
1637 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1638 struct cfg80211_ibss_params *params)
1642 struct ieee80211_supported_band *sband;
1645 if (params->bssid) {
1646 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1647 sdata->u.ibss.fixed_bssid = true;
1649 sdata->u.ibss.fixed_bssid = false;
1651 sdata->u.ibss.privacy = params->privacy;
1652 sdata->u.ibss.control_port = params->control_port;
1653 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1654 sdata->u.ibss.basic_rates = params->basic_rates;
1656 /* fix basic_rates if channel does not support these rates */
1657 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef);
1658 sband = sdata->local->hw.wiphy->bands[params->chandef.chan->band];
1659 for (i = 0; i < sband->n_bitrates; i++) {
1660 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1661 sdata->u.ibss.basic_rates &= ~BIT(i);
1663 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1664 sizeof(params->mcast_rate));
1666 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1668 sdata->u.ibss.chandef = params->chandef;
1669 sdata->u.ibss.fixed_channel = params->channel_fixed;
1672 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1674 if (sdata->u.ibss.ie)
1675 sdata->u.ibss.ie_len = params->ie_len;
1678 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1679 sdata->u.ibss.ibss_join_req = jiffies;
1681 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1682 sdata->u.ibss.ssid_len = params->ssid_len;
1684 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa,
1685 sizeof(sdata->u.ibss.ht_capa));
1686 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask,
1687 sizeof(sdata->u.ibss.ht_capa_mask));
1690 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1691 * reserved, but an HT STA shall protect HT transmissions as though
1692 * the HT Protection field were set to non-HT mixed mode.
1694 * In an IBSS, the RIFS Mode field of the HT Operation element is
1695 * also reserved, but an HT STA shall operate as though this field
1699 sdata->vif.bss_conf.ht_operation_mode |=
1700 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1701 | IEEE80211_HT_PARAM_RIFS_MODE;
1703 changed |= BSS_CHANGED_HT;
1704 ieee80211_bss_info_change_notify(sdata, changed);
1706 sdata->smps_mode = IEEE80211_SMPS_OFF;
1707 sdata->needed_rx_chains = sdata->local->rx_chains;
1709 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1714 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1716 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1718 ieee80211_ibss_disconnect(sdata);
1719 ifibss->ssid_len = 0;
1720 memset(ifibss->bssid, 0, ETH_ALEN);
1723 kfree(sdata->u.ibss.ie);
1725 /* on the next join, re-program HT parameters */
1726 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1727 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1731 skb_queue_purge(&sdata->skb_queue);
1733 del_timer_sync(&sdata->u.ibss.timer);