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;
234 sdata_assert_lock(sdata);
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.bss_conf.ibss_joined) {
244 sdata->vif.bss_conf.ibss_joined = false;
245 sdata->vif.bss_conf.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 = rcu_dereference_protected(ifibss->presp,
255 lockdep_is_held(&sdata->wdev.mtx));
256 rcu_assign_pointer(ifibss->presp, NULL);
258 kfree_rcu(presp, rcu_head);
260 sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
262 /* make a copy of the chandef, it could be modified below. */
263 chandef = *req_chandef;
265 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) {
266 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
267 chandef.width == NL80211_CHAN_WIDTH_10 ||
268 chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
269 chandef.width == NL80211_CHAN_WIDTH_20) {
271 "Failed to join IBSS, beacons forbidden\n");
274 chandef.width = NL80211_CHAN_WIDTH_20;
275 chandef.center_freq1 = chan->center_freq;
278 ieee80211_vif_release_channel(sdata);
279 if (ieee80211_vif_use_channel(sdata, &chandef,
280 ifibss->fixed_channel ?
281 IEEE80211_CHANCTX_SHARED :
282 IEEE80211_CHANCTX_EXCLUSIVE)) {
283 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
287 memcpy(ifibss->bssid, bssid, ETH_ALEN);
289 sband = local->hw.wiphy->bands[chan->band];
291 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
292 capability, tsf, &chandef,
293 &have_higher_than_11mbit, NULL);
297 rcu_assign_pointer(ifibss->presp, presp);
298 mgmt = (void *)presp->head;
300 sdata->vif.bss_conf.enable_beacon = true;
301 sdata->vif.bss_conf.beacon_int = beacon_int;
302 sdata->vif.bss_conf.basic_rates = basic_rates;
303 sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
304 memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
305 bss_change = BSS_CHANGED_BEACON_INT;
306 bss_change |= ieee80211_reset_erp_info(sdata);
307 bss_change |= BSS_CHANGED_BSSID;
308 bss_change |= BSS_CHANGED_BEACON;
309 bss_change |= BSS_CHANGED_BEACON_ENABLED;
310 bss_change |= BSS_CHANGED_BASIC_RATES;
311 bss_change |= BSS_CHANGED_HT;
312 bss_change |= BSS_CHANGED_IBSS;
313 bss_change |= BSS_CHANGED_SSID;
316 * In 5 GHz/802.11a, we can always use short slot time.
317 * (IEEE 802.11-2012 18.3.8.7)
319 * In 2.4GHz, we must always use long slots in IBSS for compatibility
321 * (IEEE 802.11-2012 19.4.5)
323 * HT follows these specifications (IEEE 802.11-2012 20.3.18)
325 sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ;
326 bss_change |= BSS_CHANGED_ERP_SLOT;
328 /* cf. IEEE 802.11 9.2.12 */
329 if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit)
330 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
332 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
334 ieee80211_set_wmm_default(sdata, true);
336 sdata->vif.bss_conf.ibss_joined = true;
337 sdata->vif.bss_conf.ibss_creator = creator;
339 err = drv_join_ibss(local, sdata);
341 sdata->vif.bss_conf.ibss_joined = false;
342 sdata->vif.bss_conf.ibss_creator = false;
343 sdata->vif.bss_conf.enable_beacon = false;
344 sdata->vif.bss_conf.ssid_len = 0;
345 RCU_INIT_POINTER(ifibss->presp, NULL);
346 kfree_rcu(presp, rcu_head);
347 ieee80211_vif_release_channel(sdata);
348 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
353 ieee80211_bss_info_change_notify(sdata, bss_change);
355 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
356 mod_timer(&ifibss->timer,
357 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
359 scan_width = cfg80211_chandef_to_scan_width(&chandef);
360 bss = cfg80211_inform_bss_width_frame(local->hw.wiphy, chan,
362 presp->head_len, 0, GFP_KERNEL);
363 cfg80211_put_bss(local->hw.wiphy, bss);
364 netif_carrier_on(sdata->dev);
365 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
368 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
369 struct ieee80211_bss *bss)
371 struct cfg80211_bss *cbss =
372 container_of((void *)bss, struct cfg80211_bss, priv);
373 struct ieee80211_supported_band *sband;
374 struct cfg80211_chan_def chandef;
377 u16 beacon_int = cbss->beacon_interval;
378 const struct cfg80211_bss_ies *ies;
379 enum nl80211_channel_type chan_type;
384 sdata_assert_lock(sdata);
389 switch (sdata->u.ibss.chandef.width) {
390 case NL80211_CHAN_WIDTH_20_NOHT:
391 case NL80211_CHAN_WIDTH_20:
392 case NL80211_CHAN_WIDTH_40:
393 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
394 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
396 case NL80211_CHAN_WIDTH_5:
397 case NL80211_CHAN_WIDTH_10:
398 cfg80211_chandef_create(&chandef, cbss->channel,
399 NL80211_CHAN_WIDTH_20_NOHT);
400 chandef.width = sdata->u.ibss.chandef.width;
403 /* fall back to 20 MHz for unsupported modes */
404 cfg80211_chandef_create(&chandef, cbss->channel,
405 NL80211_CHAN_WIDTH_20_NOHT);
409 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
410 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
411 shift = ieee80211_vif_get_shift(&sdata->vif);
415 for (i = 0; i < bss->supp_rates_len; i++) {
416 int rate = bss->supp_rates[i] & 0x7f;
417 bool is_basic = !!(bss->supp_rates[i] & 0x80);
419 for (j = 0; j < sband->n_bitrates; j++) {
421 if ((rate_flags & sband->bitrates[j].flags)
425 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
429 basic_rates |= BIT(j);
436 ies = rcu_dereference(cbss->ies);
440 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
448 static int ieee80211_send_action_csa(struct ieee80211_sub_if_data *sdata,
449 struct cfg80211_csa_settings *csa_settings)
452 struct ieee80211_mgmt *mgmt;
453 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
454 struct ieee80211_local *local = sdata->local;
456 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.chan_switch) +
457 sizeof(mgmt->u.action.u.chan_switch);
460 skb = dev_alloc_skb(local->tx_headroom + hdr_len +
461 5 + /* channel switch announcement element */
462 3); /* secondary channel offset element */
466 skb_reserve(skb, local->tx_headroom);
467 mgmt = (struct ieee80211_mgmt *)skb_put(skb, hdr_len);
468 memset(mgmt, 0, hdr_len);
469 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
470 IEEE80211_STYPE_ACTION);
472 eth_broadcast_addr(mgmt->da);
473 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
474 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
475 mgmt->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
476 mgmt->u.action.u.chan_switch.action_code = WLAN_ACTION_SPCT_CHL_SWITCH;
477 pos = skb_put(skb, 5);
478 *pos++ = WLAN_EID_CHANNEL_SWITCH; /* EID */
479 *pos++ = 3; /* IE length */
480 *pos++ = csa_settings->block_tx ? 1 : 0; /* CSA mode */
481 freq = csa_settings->chandef.chan->center_freq;
482 *pos++ = ieee80211_frequency_to_channel(freq); /* channel */
483 *pos++ = csa_settings->count; /* count */
485 if (csa_settings->chandef.width == NL80211_CHAN_WIDTH_40) {
486 enum nl80211_channel_type ch_type;
489 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; /* EID */
490 *pos++ = 1; /* IE length */
491 ch_type = cfg80211_get_chandef_type(&csa_settings->chandef);
492 if (ch_type == NL80211_CHAN_HT40PLUS)
493 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
495 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
498 ieee80211_tx_skb(sdata, skb);
502 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
503 struct cfg80211_csa_settings *csa_settings)
505 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
506 struct beacon_data *presp, *old_presp;
507 struct cfg80211_bss *cbss;
508 const struct cfg80211_bss_ies *ies;
513 sdata_assert_lock(sdata);
515 capability = WLAN_CAPABILITY_IBSS;
518 capability |= WLAN_CAPABILITY_PRIVACY;
520 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
521 ifibss->bssid, ifibss->ssid,
522 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
523 WLAN_CAPABILITY_PRIVACY,
526 if (WARN_ON(!cbss)) {
532 ies = rcu_dereference(cbss->ies);
535 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
537 old_presp = rcu_dereference_protected(ifibss->presp,
538 lockdep_is_held(&sdata->wdev.mtx));
540 presp = ieee80211_ibss_build_presp(sdata,
541 sdata->vif.bss_conf.beacon_int,
542 sdata->vif.bss_conf.basic_rates,
543 capability, tsf, &ifibss->chandef,
550 rcu_assign_pointer(ifibss->presp, presp);
552 kfree_rcu(old_presp, rcu_head);
554 /* it might not send the beacon for a while. send an action frame
555 * immediately to announce the channel switch.
558 ieee80211_send_action_csa(sdata, csa_settings);
560 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
565 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
567 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
568 struct cfg80211_bss *cbss;
573 /* update cfg80211 bss information with the new channel */
574 if (!is_zero_ether_addr(ifibss->bssid)) {
575 capability = WLAN_CAPABILITY_IBSS;
578 capability |= WLAN_CAPABILITY_PRIVACY;
580 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
581 ifibss->chandef.chan,
582 ifibss->bssid, ifibss->ssid,
583 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
584 WLAN_CAPABILITY_PRIVACY,
586 /* XXX: should not really modify cfg80211 data */
588 cbss->channel = sdata->local->csa_chandef.chan;
589 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
593 ifibss->chandef = sdata->local->csa_chandef;
595 /* generate the beacon */
596 err = ieee80211_ibss_csa_beacon(sdata, NULL);
604 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
606 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
608 cancel_work_sync(&ifibss->csa_connection_drop_work);
611 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
614 struct ieee80211_sub_if_data *sdata = sta->sdata;
617 memcpy(addr, sta->sta.addr, ETH_ALEN);
619 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
621 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
622 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
623 /* authorize the station only if the network is not RSN protected. If
624 * not wait for the userspace to authorize it */
625 if (!sta->sdata->u.ibss.control_port)
626 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
628 rate_control_rate_init(sta);
630 /* If it fails, maybe we raced another insertion? */
631 if (sta_info_insert_rcu(sta))
632 return sta_info_get(sdata, addr);
636 static struct sta_info *
637 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
638 const u8 *addr, u32 supp_rates)
641 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
642 struct ieee80211_local *local = sdata->local;
643 struct sta_info *sta;
644 struct ieee80211_chanctx_conf *chanctx_conf;
645 struct ieee80211_supported_band *sband;
646 enum nl80211_bss_scan_width scan_width;
650 * XXX: Consider removing the least recently used entry and
651 * allow new one to be added.
653 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
654 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
660 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
665 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
671 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
672 if (WARN_ON_ONCE(!chanctx_conf))
674 band = chanctx_conf->def.chan->band;
675 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
678 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
684 sta->last_rx = jiffies;
686 /* make sure mandatory rates are always added */
687 sband = local->hw.wiphy->bands[band];
688 sta->sta.supp_rates[band] = supp_rates |
689 ieee80211_mandatory_rates(sband, scan_width);
691 return ieee80211_ibss_finish_sta(sta);
694 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
696 struct ieee80211_local *local = sdata->local;
698 struct sta_info *sta;
700 sdata_assert_lock(sdata);
704 list_for_each_entry_rcu(sta, &local->sta_list, list) {
705 if (sta->sdata == sdata &&
706 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
718 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
720 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
721 struct ieee80211_local *local = sdata->local;
722 struct cfg80211_bss *cbss;
723 struct beacon_data *presp;
724 struct sta_info *sta;
728 active_ibss = ieee80211_sta_active_ibss(sdata);
730 if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) {
731 capability = WLAN_CAPABILITY_IBSS;
734 capability |= WLAN_CAPABILITY_PRIVACY;
736 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
737 ifibss->bssid, ifibss->ssid,
738 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
739 WLAN_CAPABILITY_PRIVACY,
743 cfg80211_unlink_bss(local->hw.wiphy, cbss);
744 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
748 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
750 sta_info_flush(sdata);
752 spin_lock_bh(&ifibss->incomplete_lock);
753 while (!list_empty(&ifibss->incomplete_stations)) {
754 sta = list_first_entry(&ifibss->incomplete_stations,
755 struct sta_info, list);
756 list_del(&sta->list);
757 spin_unlock_bh(&ifibss->incomplete_lock);
759 sta_info_free(local, sta);
760 spin_lock_bh(&ifibss->incomplete_lock);
762 spin_unlock_bh(&ifibss->incomplete_lock);
764 netif_carrier_off(sdata->dev);
766 sdata->vif.bss_conf.ibss_joined = false;
767 sdata->vif.bss_conf.ibss_creator = false;
768 sdata->vif.bss_conf.enable_beacon = false;
769 sdata->vif.bss_conf.ssid_len = 0;
772 presp = rcu_dereference_protected(ifibss->presp,
773 lockdep_is_held(&sdata->wdev.mtx));
774 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
776 kfree_rcu(presp, rcu_head);
778 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
779 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
781 drv_leave_ibss(local, sdata);
782 ieee80211_vif_release_channel(sdata);
785 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
787 struct ieee80211_sub_if_data *sdata =
788 container_of(work, struct ieee80211_sub_if_data,
789 u.ibss.csa_connection_drop_work);
791 ieee80211_ibss_disconnect(sdata);
793 skb_queue_purge(&sdata->skb_queue);
795 /* trigger a scan to find another IBSS network to join */
796 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
800 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
801 struct ieee802_11_elems *elems,
804 struct cfg80211_csa_settings params;
805 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
806 struct ieee80211_chanctx_conf *chanctx_conf;
807 struct ieee80211_chanctx *chanctx;
808 enum nl80211_channel_type ch_type;
809 int err, num_chanctx;
813 if (sdata->vif.csa_active)
816 if (!sdata->vif.bss_conf.ibss_joined)
819 sta_flags = IEEE80211_STA_DISABLE_VHT;
820 switch (ifibss->chandef.width) {
821 case NL80211_CHAN_WIDTH_5:
822 case NL80211_CHAN_WIDTH_10:
823 case NL80211_CHAN_WIDTH_20_NOHT:
824 sta_flags |= IEEE80211_STA_DISABLE_HT;
826 case NL80211_CHAN_WIDTH_20:
827 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
833 memset(¶ms, 0, sizeof(params));
834 err = ieee80211_parse_ch_switch_ie(sdata, elems, beacon,
835 ifibss->chandef.chan->band,
836 sta_flags, ifibss->bssid,
837 ¶ms.count, &mode,
840 /* can't switch to destination channel, fail */
844 /* did not contain a CSA */
848 if (ifibss->chandef.chan->band != params.chandef.chan->band)
851 switch (ifibss->chandef.width) {
852 case NL80211_CHAN_WIDTH_20_NOHT:
853 case NL80211_CHAN_WIDTH_20:
854 case NL80211_CHAN_WIDTH_40:
855 /* keep our current HT mode (HT20/HT40+/HT40-), even if
856 * another mode has been announced. The mode is not adopted
857 * within the beacon while doing CSA and we should therefore
858 * keep the mode which we announce.
860 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
861 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan,
864 case NL80211_CHAN_WIDTH_5:
865 case NL80211_CHAN_WIDTH_10:
866 if (params.chandef.width != ifibss->chandef.width) {
868 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
870 params.chandef.chan->center_freq,
871 params.chandef.width,
872 params.chandef.center_freq1,
873 params.chandef.center_freq2);
878 /* should not happen, sta_flags should prevent VHT modes. */
883 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, ¶ms.chandef,
884 IEEE80211_CHAN_DISABLED)) {
886 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
888 params.chandef.chan->center_freq,
889 params.chandef.width,
890 params.chandef.center_freq1,
891 params.chandef.center_freq2);
895 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
900 params.radar_required = true;
902 /* TODO: IBSS-DFS not (yet) supported, disconnect. */
907 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
913 /* don't handle for multi-VIF cases */
914 chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
915 if (chanctx->refcount > 1) {
920 list_for_each_entry_rcu(chanctx, &sdata->local->chanctx_list, list)
923 if (num_chanctx > 1) {
929 /* all checks done, now perform the channel switch. */
931 "received channel switch announcement to go to channel %d MHz\n",
932 params.chandef.chan->center_freq);
934 params.block_tx = !!mode;
936 ieee80211_ibss_csa_beacon(sdata, ¶ms);
937 sdata->csa_radar_required = params.radar_required;
940 ieee80211_stop_queues_by_reason(&sdata->local->hw,
941 IEEE80211_MAX_QUEUE_MAP,
942 IEEE80211_QUEUE_STOP_REASON_CSA);
944 sdata->local->csa_chandef = params.chandef;
945 sdata->vif.csa_active = true;
947 ieee80211_bss_info_change_notify(sdata, err);
948 drv_channel_switch_beacon(sdata, ¶ms.chandef);
952 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
953 ieee80211_queue_work(&sdata->local->hw,
954 &ifibss->csa_connection_drop_work);
960 ieee80211_rx_mgmt_spectrum_mgmt(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)
967 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
970 /* CSA is the only action we handle for now */
971 if (mgmt->u.action.u.measurement.action_code !=
972 WLAN_ACTION_SPCT_CHL_SWITCH)
975 required_len = IEEE80211_MIN_ACTION_SIZE +
976 sizeof(mgmt->u.action.u.chan_switch);
977 if (len < required_len)
980 ieee80211_ibss_process_chanswitch(sdata, elems, false);
983 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
984 struct ieee80211_mgmt *mgmt,
987 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
989 if (len < IEEE80211_DEAUTH_FRAME_LEN)
992 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
993 mgmt->sa, mgmt->da, mgmt->bssid, reason);
994 sta_info_destroy_addr(sdata, mgmt->sa);
997 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
998 struct ieee80211_mgmt *mgmt,
1001 u16 auth_alg, auth_transaction;
1003 sdata_assert_lock(sdata);
1008 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1009 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1012 "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
1013 mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
1015 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1019 * IEEE 802.11 standard does not require authentication in IBSS
1020 * networks and most implementations do not seem to use it.
1021 * However, try to reply to authentication attempts if someone
1022 * has actually implemented this.
1024 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
1025 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
1028 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1029 struct ieee80211_mgmt *mgmt, size_t len,
1030 struct ieee80211_rx_status *rx_status,
1031 struct ieee802_11_elems *elems)
1033 struct ieee80211_local *local = sdata->local;
1035 struct cfg80211_bss *cbss;
1036 struct ieee80211_bss *bss;
1037 struct sta_info *sta;
1038 struct ieee80211_channel *channel;
1039 u64 beacon_timestamp, rx_timestamp;
1041 enum ieee80211_band band = rx_status->band;
1042 enum nl80211_bss_scan_width scan_width;
1043 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
1044 bool rates_updated = false;
1046 if (elems->ds_params)
1047 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
1050 freq = rx_status->freq;
1052 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1054 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1057 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1058 ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) {
1061 sta = sta_info_get(sdata, mgmt->sa);
1063 if (elems->supp_rates) {
1064 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1069 prev_rates = sta->sta.supp_rates[band];
1070 /* make sure mandatory rates are always added */
1071 scan_width = NL80211_BSS_CHAN_WIDTH_20;
1072 if (rx_status->flag & RX_FLAG_5MHZ)
1073 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1074 if (rx_status->flag & RX_FLAG_10MHZ)
1075 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1077 sta->sta.supp_rates[band] = supp_rates |
1078 ieee80211_mandatory_rates(sband,
1080 if (sta->sta.supp_rates[band] != prev_rates) {
1082 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1083 sta->sta.addr, prev_rates,
1084 sta->sta.supp_rates[band]);
1085 rates_updated = true;
1089 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1090 mgmt->sa, supp_rates);
1094 if (sta && elems->wmm_info)
1095 set_sta_flag(sta, WLAN_STA_WME);
1097 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1098 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1099 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1100 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1101 /* we both use HT */
1102 struct ieee80211_ht_cap htcap_ie;
1103 struct cfg80211_chan_def chandef;
1105 ieee80211_ht_oper_to_chandef(channel,
1106 elems->ht_operation,
1109 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1112 * fall back to HT20 if we don't use or use
1113 * the other extension channel
1115 if (chandef.center_freq1 !=
1116 sdata->u.ibss.chandef.center_freq1)
1117 htcap_ie.cap_info &=
1118 cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40);
1120 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(
1121 sdata, sband, &htcap_ie, sta);
1124 if (sta && rates_updated) {
1125 drv_sta_rc_update(local, sdata, &sta->sta,
1126 IEEE80211_RC_SUPP_RATES_CHANGED);
1127 rate_control_rate_init(sta);
1133 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1138 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1140 /* same for beacon and probe response */
1141 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1143 /* check if we need to merge IBSS */
1146 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1149 /* different channel */
1150 if (sdata->u.ibss.fixed_channel &&
1151 sdata->u.ibss.chandef.chan != cbss->channel)
1154 /* different SSID */
1155 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1156 memcmp(elems->ssid, sdata->u.ibss.ssid,
1157 sdata->u.ibss.ssid_len))
1160 /* process channel switch */
1161 if (ieee80211_ibss_process_chanswitch(sdata, elems, true))
1165 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1168 /* we use a fixed BSSID */
1169 if (sdata->u.ibss.fixed_bssid)
1172 if (ieee80211_have_rx_timestamp(rx_status)) {
1173 /* time when timestamp field was received */
1175 ieee80211_calculate_rx_timestamp(local, rx_status,
1179 * second best option: get current TSF
1180 * (will return -1 if not supported)
1182 rx_timestamp = drv_get_tsf(local, sdata);
1186 "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1187 mgmt->sa, mgmt->bssid,
1188 (unsigned long long)rx_timestamp,
1189 (unsigned long long)beacon_timestamp,
1190 (unsigned long long)(rx_timestamp - beacon_timestamp),
1193 if (beacon_timestamp > rx_timestamp) {
1195 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1197 ieee80211_sta_join_ibss(sdata, bss);
1198 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1199 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1205 ieee80211_rx_bss_put(local, bss);
1208 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1209 const u8 *bssid, const u8 *addr,
1212 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1213 struct ieee80211_local *local = sdata->local;
1214 struct sta_info *sta;
1215 struct ieee80211_chanctx_conf *chanctx_conf;
1216 struct ieee80211_supported_band *sband;
1217 enum nl80211_bss_scan_width scan_width;
1221 * XXX: Consider removing the least recently used entry and
1222 * allow new one to be added.
1224 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1225 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1230 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1233 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1237 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1238 if (WARN_ON_ONCE(!chanctx_conf)) {
1242 band = chanctx_conf->def.chan->band;
1243 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1246 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1250 sta->last_rx = jiffies;
1252 /* make sure mandatory rates are always added */
1253 sband = local->hw.wiphy->bands[band];
1254 sta->sta.supp_rates[band] = supp_rates |
1255 ieee80211_mandatory_rates(sband, scan_width);
1257 spin_lock(&ifibss->incomplete_lock);
1258 list_add(&sta->list, &ifibss->incomplete_stations);
1259 spin_unlock(&ifibss->incomplete_lock);
1260 ieee80211_queue_work(&local->hw, &sdata->work);
1263 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1265 struct ieee80211_local *local = sdata->local;
1266 struct sta_info *sta, *tmp;
1267 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1268 unsigned long exp_rsn_time = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1270 mutex_lock(&local->sta_mtx);
1272 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1273 if (sdata != sta->sdata)
1276 if (time_after(jiffies, sta->last_rx + exp_time) ||
1277 (time_after(jiffies, sta->last_rx + exp_rsn_time) &&
1278 sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1279 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1280 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1281 "not authorized " : "", sta->sta.addr);
1283 WARN_ON(__sta_info_destroy(sta));
1287 mutex_unlock(&local->sta_mtx);
1291 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1294 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1296 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1297 enum nl80211_bss_scan_width scan_width;
1299 sdata_assert_lock(sdata);
1301 mod_timer(&ifibss->timer,
1302 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1304 ieee80211_ibss_sta_expire(sdata);
1306 if (time_before(jiffies, ifibss->last_scan_completed +
1307 IEEE80211_IBSS_MERGE_INTERVAL))
1310 if (ieee80211_sta_active_ibss(sdata))
1313 if (ifibss->fixed_channel)
1317 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1319 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1320 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1324 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1326 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1331 sdata_assert_lock(sdata);
1333 if (ifibss->fixed_bssid) {
1334 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1336 /* Generate random, not broadcast, locally administered BSSID. Mix in
1337 * own MAC address to make sure that devices that do not have proper
1338 * random number generator get different BSSID. */
1339 get_random_bytes(bssid, ETH_ALEN);
1340 for (i = 0; i < ETH_ALEN; i++)
1341 bssid[i] ^= sdata->vif.addr[i];
1346 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1348 capability = WLAN_CAPABILITY_IBSS;
1350 if (ifibss->privacy)
1351 capability |= WLAN_CAPABILITY_PRIVACY;
1353 sdata->drop_unencrypted = 0;
1355 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1356 &ifibss->chandef, ifibss->basic_rates,
1357 capability, 0, true);
1361 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1364 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1366 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1367 struct ieee80211_local *local = sdata->local;
1368 struct cfg80211_bss *cbss;
1369 struct ieee80211_channel *chan = NULL;
1370 const u8 *bssid = NULL;
1371 enum nl80211_bss_scan_width scan_width;
1375 sdata_assert_lock(sdata);
1377 active_ibss = ieee80211_sta_active_ibss(sdata);
1378 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1383 capability = WLAN_CAPABILITY_IBSS;
1384 if (ifibss->privacy)
1385 capability |= WLAN_CAPABILITY_PRIVACY;
1386 if (ifibss->fixed_bssid)
1387 bssid = ifibss->bssid;
1388 if (ifibss->fixed_channel)
1389 chan = ifibss->chandef.chan;
1390 if (!is_zero_ether_addr(ifibss->bssid))
1391 bssid = ifibss->bssid;
1392 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1393 ifibss->ssid, ifibss->ssid_len,
1394 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
1398 struct ieee80211_bss *bss;
1400 bss = (void *)cbss->priv;
1402 "sta_find_ibss: selected %pM current %pM\n",
1403 cbss->bssid, ifibss->bssid);
1405 "Selected IBSS BSSID %pM based on configured SSID\n",
1408 ieee80211_sta_join_ibss(sdata, bss);
1409 ieee80211_rx_bss_put(local, bss);
1413 /* if a fixed bssid and a fixed freq have been provided create the IBSS
1414 * directly and do not waste time scanning
1416 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1417 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1419 ieee80211_sta_create_ibss(sdata);
1424 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1426 /* Selected IBSS not found in current scan results - try to scan */
1427 if (time_after(jiffies, ifibss->last_scan_completed +
1428 IEEE80211_SCAN_INTERVAL)) {
1429 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1431 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1432 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1433 ifibss->ssid_len, chan,
1436 int interval = IEEE80211_SCAN_INTERVAL;
1438 if (time_after(jiffies, ifibss->ibss_join_req +
1439 IEEE80211_IBSS_JOIN_TIMEOUT))
1440 ieee80211_sta_create_ibss(sdata);
1442 mod_timer(&ifibss->timer,
1443 round_jiffies(jiffies + interval));
1447 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1448 struct sk_buff *req)
1450 struct ieee80211_mgmt *mgmt = (void *)req->data;
1451 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1452 struct ieee80211_local *local = sdata->local;
1453 int tx_last_beacon, len = req->len;
1454 struct sk_buff *skb;
1455 struct beacon_data *presp;
1458 sdata_assert_lock(sdata);
1460 presp = rcu_dereference_protected(ifibss->presp,
1461 lockdep_is_held(&sdata->wdev.mtx));
1463 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1464 len < 24 + 2 || !presp)
1467 tx_last_beacon = drv_tx_last_beacon(local);
1470 "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
1471 mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
1473 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1476 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1477 !is_broadcast_ether_addr(mgmt->bssid))
1480 end = ((u8 *) mgmt) + len;
1481 pos = mgmt->u.probe_req.variable;
1482 if (pos[0] != WLAN_EID_SSID ||
1483 pos + 2 + pos[1] > end) {
1484 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1489 (pos[1] != ifibss->ssid_len ||
1490 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1491 /* Ignore ProbeReq for foreign SSID */
1495 /* Reply with ProbeResp */
1496 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1500 skb_reserve(skb, local->tx_headroom);
1501 memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
1503 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1504 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1505 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1506 ieee80211_tx_skb(sdata, skb);
1510 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1511 struct ieee80211_mgmt *mgmt, size_t len,
1512 struct ieee80211_rx_status *rx_status)
1515 struct ieee802_11_elems elems;
1517 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1518 offsetof(typeof(mgmt->u.beacon), variable));
1521 * either beacon or probe_resp but the variable field is at the
1524 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1528 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1531 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1534 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1535 struct sk_buff *skb)
1537 struct ieee80211_rx_status *rx_status;
1538 struct ieee80211_mgmt *mgmt;
1540 struct ieee802_11_elems elems;
1543 rx_status = IEEE80211_SKB_RXCB(skb);
1544 mgmt = (struct ieee80211_mgmt *) skb->data;
1545 fc = le16_to_cpu(mgmt->frame_control);
1549 if (!sdata->u.ibss.ssid_len)
1550 goto mgmt_out; /* not ready to merge yet */
1552 switch (fc & IEEE80211_FCTL_STYPE) {
1553 case IEEE80211_STYPE_PROBE_REQ:
1554 ieee80211_rx_mgmt_probe_req(sdata, skb);
1556 case IEEE80211_STYPE_PROBE_RESP:
1557 case IEEE80211_STYPE_BEACON:
1558 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1561 case IEEE80211_STYPE_AUTH:
1562 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1564 case IEEE80211_STYPE_DEAUTH:
1565 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1567 case IEEE80211_STYPE_ACTION:
1568 switch (mgmt->u.action.category) {
1569 case WLAN_CATEGORY_SPECTRUM_MGMT:
1570 ies_len = skb->len -
1571 offsetof(struct ieee80211_mgmt,
1572 u.action.u.chan_switch.variable);
1577 ieee802_11_parse_elems(
1578 mgmt->u.action.u.chan_switch.variable,
1579 ies_len, true, &elems);
1581 if (elems.parse_error)
1584 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1591 sdata_unlock(sdata);
1594 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1596 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1597 struct sta_info *sta;
1602 * Work could be scheduled after scan or similar
1603 * when we aren't even joined (or trying) with a
1606 if (!ifibss->ssid_len)
1609 spin_lock_bh(&ifibss->incomplete_lock);
1610 while (!list_empty(&ifibss->incomplete_stations)) {
1611 sta = list_first_entry(&ifibss->incomplete_stations,
1612 struct sta_info, list);
1613 list_del(&sta->list);
1614 spin_unlock_bh(&ifibss->incomplete_lock);
1616 ieee80211_ibss_finish_sta(sta);
1618 spin_lock_bh(&ifibss->incomplete_lock);
1620 spin_unlock_bh(&ifibss->incomplete_lock);
1622 switch (ifibss->state) {
1623 case IEEE80211_IBSS_MLME_SEARCH:
1624 ieee80211_sta_find_ibss(sdata);
1626 case IEEE80211_IBSS_MLME_JOINED:
1627 ieee80211_sta_merge_ibss(sdata);
1635 sdata_unlock(sdata);
1638 static void ieee80211_ibss_timer(unsigned long data)
1640 struct ieee80211_sub_if_data *sdata =
1641 (struct ieee80211_sub_if_data *) data;
1643 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1646 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1648 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1650 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1651 (unsigned long) sdata);
1652 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1653 spin_lock_init(&ifibss->incomplete_lock);
1654 INIT_WORK(&ifibss->csa_connection_drop_work,
1655 ieee80211_csa_connection_drop_work);
1658 /* scan finished notification */
1659 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1661 struct ieee80211_sub_if_data *sdata;
1663 mutex_lock(&local->iflist_mtx);
1664 list_for_each_entry(sdata, &local->interfaces, list) {
1665 if (!ieee80211_sdata_running(sdata))
1667 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1669 sdata->u.ibss.last_scan_completed = jiffies;
1670 ieee80211_queue_work(&local->hw, &sdata->work);
1672 mutex_unlock(&local->iflist_mtx);
1675 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1676 struct cfg80211_ibss_params *params)
1680 struct ieee80211_supported_band *sband;
1683 if (params->bssid) {
1684 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1685 sdata->u.ibss.fixed_bssid = true;
1687 sdata->u.ibss.fixed_bssid = false;
1689 sdata->u.ibss.privacy = params->privacy;
1690 sdata->u.ibss.control_port = params->control_port;
1691 sdata->u.ibss.basic_rates = params->basic_rates;
1693 /* fix basic_rates if channel does not support these rates */
1694 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef);
1695 sband = sdata->local->hw.wiphy->bands[params->chandef.chan->band];
1696 for (i = 0; i < sband->n_bitrates; i++) {
1697 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1698 sdata->u.ibss.basic_rates &= ~BIT(i);
1700 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1701 sizeof(params->mcast_rate));
1703 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1705 sdata->u.ibss.chandef = params->chandef;
1706 sdata->u.ibss.fixed_channel = params->channel_fixed;
1709 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1711 if (sdata->u.ibss.ie)
1712 sdata->u.ibss.ie_len = params->ie_len;
1715 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1716 sdata->u.ibss.ibss_join_req = jiffies;
1718 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1719 sdata->u.ibss.ssid_len = params->ssid_len;
1721 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa,
1722 sizeof(sdata->u.ibss.ht_capa));
1723 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask,
1724 sizeof(sdata->u.ibss.ht_capa_mask));
1727 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1728 * reserved, but an HT STA shall protect HT transmissions as though
1729 * the HT Protection field were set to non-HT mixed mode.
1731 * In an IBSS, the RIFS Mode field of the HT Operation element is
1732 * also reserved, but an HT STA shall operate as though this field
1736 sdata->vif.bss_conf.ht_operation_mode |=
1737 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1738 | IEEE80211_HT_PARAM_RIFS_MODE;
1740 changed |= BSS_CHANGED_HT;
1741 ieee80211_bss_info_change_notify(sdata, changed);
1743 sdata->smps_mode = IEEE80211_SMPS_OFF;
1744 sdata->needed_rx_chains = sdata->local->rx_chains;
1746 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1751 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1753 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1755 ieee80211_ibss_disconnect(sdata);
1756 ifibss->ssid_len = 0;
1757 memset(ifibss->bssid, 0, ETH_ALEN);
1760 kfree(sdata->u.ibss.ie);
1762 /* on the next join, re-program HT parameters */
1763 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1764 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1768 skb_queue_purge(&sdata->skb_queue);
1770 del_timer_sync(&sdata->u.ibss.timer);