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_mgmt *mgmt;
224 struct cfg80211_bss *bss;
226 struct cfg80211_chan_def chandef;
227 struct ieee80211_channel *chan;
228 struct beacon_data *presp;
229 enum nl80211_bss_scan_width scan_width;
230 bool have_higher_than_11mbit;
231 bool radar_required = false;
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;
276 /* check again for downgraded chandef */
277 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) {
279 "Failed to join IBSS, beacons forbidden\n");
284 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
288 "Failed to join IBSS, invalid chandef\n");
292 if (!ifibss->userspace_handles_dfs) {
294 "Failed to join IBSS, DFS channel without control program\n");
297 radar_required = true;
300 mutex_lock(&local->mtx);
301 if (ieee80211_vif_use_channel(sdata, &chandef,
302 ifibss->fixed_channel ?
303 IEEE80211_CHANCTX_SHARED :
304 IEEE80211_CHANCTX_EXCLUSIVE)) {
305 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
306 mutex_unlock(&local->mtx);
309 sdata->radar_required = radar_required;
310 mutex_unlock(&local->mtx);
312 memcpy(ifibss->bssid, bssid, ETH_ALEN);
314 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
315 capability, tsf, &chandef,
316 &have_higher_than_11mbit, NULL);
320 rcu_assign_pointer(ifibss->presp, presp);
321 mgmt = (void *)presp->head;
323 sdata->vif.bss_conf.enable_beacon = true;
324 sdata->vif.bss_conf.beacon_int = beacon_int;
325 sdata->vif.bss_conf.basic_rates = basic_rates;
326 sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
327 memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
328 bss_change = BSS_CHANGED_BEACON_INT;
329 bss_change |= ieee80211_reset_erp_info(sdata);
330 bss_change |= BSS_CHANGED_BSSID;
331 bss_change |= BSS_CHANGED_BEACON;
332 bss_change |= BSS_CHANGED_BEACON_ENABLED;
333 bss_change |= BSS_CHANGED_BASIC_RATES;
334 bss_change |= BSS_CHANGED_HT;
335 bss_change |= BSS_CHANGED_IBSS;
336 bss_change |= BSS_CHANGED_SSID;
339 * In 5 GHz/802.11a, we can always use short slot time.
340 * (IEEE 802.11-2012 18.3.8.7)
342 * In 2.4GHz, we must always use long slots in IBSS for compatibility
344 * (IEEE 802.11-2012 19.4.5)
346 * HT follows these specifications (IEEE 802.11-2012 20.3.18)
348 sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ;
349 bss_change |= BSS_CHANGED_ERP_SLOT;
351 /* cf. IEEE 802.11 9.2.12 */
352 if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit)
353 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
355 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
357 ieee80211_set_wmm_default(sdata, true);
359 sdata->vif.bss_conf.ibss_joined = true;
360 sdata->vif.bss_conf.ibss_creator = creator;
362 err = drv_join_ibss(local, sdata);
364 sdata->vif.bss_conf.ibss_joined = false;
365 sdata->vif.bss_conf.ibss_creator = false;
366 sdata->vif.bss_conf.enable_beacon = false;
367 sdata->vif.bss_conf.ssid_len = 0;
368 RCU_INIT_POINTER(ifibss->presp, NULL);
369 kfree_rcu(presp, rcu_head);
370 mutex_lock(&local->mtx);
371 ieee80211_vif_release_channel(sdata);
372 mutex_unlock(&local->mtx);
373 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
378 ieee80211_bss_info_change_notify(sdata, bss_change);
380 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
381 mod_timer(&ifibss->timer,
382 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
384 scan_width = cfg80211_chandef_to_scan_width(&chandef);
385 bss = cfg80211_inform_bss_width_frame(local->hw.wiphy, chan,
387 presp->head_len, 0, GFP_KERNEL);
388 cfg80211_put_bss(local->hw.wiphy, bss);
389 netif_carrier_on(sdata->dev);
390 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
393 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
394 struct ieee80211_bss *bss)
396 struct cfg80211_bss *cbss =
397 container_of((void *)bss, struct cfg80211_bss, priv);
398 struct ieee80211_supported_band *sband;
399 struct cfg80211_chan_def chandef;
402 u16 beacon_int = cbss->beacon_interval;
403 const struct cfg80211_bss_ies *ies;
404 enum nl80211_channel_type chan_type;
409 sdata_assert_lock(sdata);
414 switch (sdata->u.ibss.chandef.width) {
415 case NL80211_CHAN_WIDTH_20_NOHT:
416 case NL80211_CHAN_WIDTH_20:
417 case NL80211_CHAN_WIDTH_40:
418 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
419 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
421 case NL80211_CHAN_WIDTH_5:
422 case NL80211_CHAN_WIDTH_10:
423 cfg80211_chandef_create(&chandef, cbss->channel,
424 NL80211_CHAN_WIDTH_20_NOHT);
425 chandef.width = sdata->u.ibss.chandef.width;
428 /* fall back to 20 MHz for unsupported modes */
429 cfg80211_chandef_create(&chandef, cbss->channel,
430 NL80211_CHAN_WIDTH_20_NOHT);
434 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
435 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
436 shift = ieee80211_vif_get_shift(&sdata->vif);
440 for (i = 0; i < bss->supp_rates_len; i++) {
441 int rate = bss->supp_rates[i] & 0x7f;
442 bool is_basic = !!(bss->supp_rates[i] & 0x80);
444 for (j = 0; j < sband->n_bitrates; j++) {
446 if ((rate_flags & sband->bitrates[j].flags)
450 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
454 basic_rates |= BIT(j);
461 ies = rcu_dereference(cbss->ies);
465 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
473 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
474 struct cfg80211_csa_settings *csa_settings)
476 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
477 struct beacon_data *presp, *old_presp;
478 struct cfg80211_bss *cbss;
479 const struct cfg80211_bss_ies *ies;
484 sdata_assert_lock(sdata);
486 capability = WLAN_CAPABILITY_IBSS;
489 capability |= WLAN_CAPABILITY_PRIVACY;
491 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
492 ifibss->bssid, ifibss->ssid,
493 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
494 WLAN_CAPABILITY_PRIVACY,
497 if (WARN_ON(!cbss)) {
503 ies = rcu_dereference(cbss->ies);
506 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
508 old_presp = rcu_dereference_protected(ifibss->presp,
509 lockdep_is_held(&sdata->wdev.mtx));
511 presp = ieee80211_ibss_build_presp(sdata,
512 sdata->vif.bss_conf.beacon_int,
513 sdata->vif.bss_conf.basic_rates,
514 capability, tsf, &ifibss->chandef,
521 rcu_assign_pointer(ifibss->presp, presp);
523 kfree_rcu(old_presp, rcu_head);
525 return BSS_CHANGED_BEACON;
530 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
532 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
533 struct cfg80211_bss *cbss;
534 int err, changed = 0;
537 sdata_assert_lock(sdata);
539 /* update cfg80211 bss information with the new channel */
540 if (!is_zero_ether_addr(ifibss->bssid)) {
541 capability = WLAN_CAPABILITY_IBSS;
544 capability |= WLAN_CAPABILITY_PRIVACY;
546 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
547 ifibss->chandef.chan,
548 ifibss->bssid, ifibss->ssid,
549 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
550 WLAN_CAPABILITY_PRIVACY,
552 /* XXX: should not really modify cfg80211 data */
554 cbss->channel = sdata->csa_chandef.chan;
555 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
559 ifibss->chandef = sdata->csa_chandef;
561 /* generate the beacon */
562 err = ieee80211_ibss_csa_beacon(sdata, NULL);
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;
694 if (!is_zero_ether_addr(ifibss->bssid)) {
695 capability = WLAN_CAPABILITY_IBSS;
698 capability |= WLAN_CAPABILITY_PRIVACY;
700 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
701 ifibss->bssid, ifibss->ssid,
702 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
703 WLAN_CAPABILITY_PRIVACY,
707 cfg80211_unlink_bss(local->hw.wiphy, cbss);
708 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
712 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
714 sta_info_flush(sdata);
716 spin_lock_bh(&ifibss->incomplete_lock);
717 while (!list_empty(&ifibss->incomplete_stations)) {
718 sta = list_first_entry(&ifibss->incomplete_stations,
719 struct sta_info, list);
720 list_del(&sta->list);
721 spin_unlock_bh(&ifibss->incomplete_lock);
723 sta_info_free(local, sta);
724 spin_lock_bh(&ifibss->incomplete_lock);
726 spin_unlock_bh(&ifibss->incomplete_lock);
728 netif_carrier_off(sdata->dev);
730 sdata->vif.bss_conf.ibss_joined = false;
731 sdata->vif.bss_conf.ibss_creator = false;
732 sdata->vif.bss_conf.enable_beacon = false;
733 sdata->vif.bss_conf.ssid_len = 0;
736 presp = rcu_dereference_protected(ifibss->presp,
737 lockdep_is_held(&sdata->wdev.mtx));
738 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
740 kfree_rcu(presp, rcu_head);
742 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
743 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
745 drv_leave_ibss(local, sdata);
746 mutex_lock(&local->mtx);
747 ieee80211_vif_release_channel(sdata);
748 mutex_unlock(&local->mtx);
751 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
753 struct ieee80211_sub_if_data *sdata =
754 container_of(work, struct ieee80211_sub_if_data,
755 u.ibss.csa_connection_drop_work);
759 ieee80211_ibss_disconnect(sdata);
761 skb_queue_purge(&sdata->skb_queue);
763 /* trigger a scan to find another IBSS network to join */
764 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
769 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
771 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
774 /* if the current channel is a DFS channel, mark the channel as
777 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
780 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
785 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
786 struct ieee802_11_elems *elems,
789 struct cfg80211_csa_settings params;
790 struct ieee80211_csa_ie csa_ie;
791 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
792 enum nl80211_channel_type ch_type;
796 sdata_assert_lock(sdata);
798 sta_flags = IEEE80211_STA_DISABLE_VHT;
799 switch (ifibss->chandef.width) {
800 case NL80211_CHAN_WIDTH_5:
801 case NL80211_CHAN_WIDTH_10:
802 case NL80211_CHAN_WIDTH_20_NOHT:
803 sta_flags |= IEEE80211_STA_DISABLE_HT;
805 case NL80211_CHAN_WIDTH_20:
806 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
812 memset(¶ms, 0, sizeof(params));
813 memset(&csa_ie, 0, sizeof(csa_ie));
814 err = ieee80211_parse_ch_switch_ie(sdata, elems, beacon,
815 ifibss->chandef.chan->band,
816 sta_flags, ifibss->bssid, &csa_ie);
817 /* can't switch to destination channel, fail */
821 /* did not contain a CSA */
825 /* channel switch is not supported, disconnect */
826 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
829 params.count = csa_ie.count;
830 params.chandef = csa_ie.chandef;
832 switch (ifibss->chandef.width) {
833 case NL80211_CHAN_WIDTH_20_NOHT:
834 case NL80211_CHAN_WIDTH_20:
835 case NL80211_CHAN_WIDTH_40:
836 /* keep our current HT mode (HT20/HT40+/HT40-), even if
837 * another mode has been announced. The mode is not adopted
838 * within the beacon while doing CSA and we should therefore
839 * keep the mode which we announce.
841 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
842 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan,
845 case NL80211_CHAN_WIDTH_5:
846 case NL80211_CHAN_WIDTH_10:
847 if (params.chandef.width != ifibss->chandef.width) {
849 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
851 params.chandef.chan->center_freq,
852 params.chandef.width,
853 params.chandef.center_freq1,
854 params.chandef.center_freq2);
859 /* should not happen, sta_flags should prevent VHT modes. */
864 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef)) {
866 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
868 params.chandef.chan->center_freq,
869 params.chandef.width,
870 params.chandef.center_freq1,
871 params.chandef.center_freq2);
875 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
880 /* IBSS-DFS only allowed with a control program */
881 if (!ifibss->userspace_handles_dfs)
884 params.radar_required = true;
887 if (cfg80211_chandef_identical(¶ms.chandef,
888 &sdata->vif.bss_conf.chandef)) {
890 "received csa with an identical chandef, ignoring\n");
894 /* all checks done, now perform the channel switch. */
896 "received channel switch announcement to go to channel %d MHz\n",
897 params.chandef.chan->center_freq);
899 params.block_tx = !!csa_ie.mode;
901 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
905 ieee80211_ibss_csa_mark_radar(sdata);
909 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
910 ieee80211_queue_work(&sdata->local->hw,
911 &ifibss->csa_connection_drop_work);
913 ieee80211_ibss_csa_mark_radar(sdata);
919 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
920 struct ieee80211_mgmt *mgmt, size_t len,
921 struct ieee80211_rx_status *rx_status,
922 struct ieee802_11_elems *elems)
926 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
929 /* CSA is the only action we handle for now */
930 if (mgmt->u.action.u.measurement.action_code !=
931 WLAN_ACTION_SPCT_CHL_SWITCH)
934 required_len = IEEE80211_MIN_ACTION_SIZE +
935 sizeof(mgmt->u.action.u.chan_switch);
936 if (len < required_len)
939 if (!sdata->vif.csa_active)
940 ieee80211_ibss_process_chanswitch(sdata, elems, false);
943 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
944 struct ieee80211_mgmt *mgmt,
947 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
949 if (len < IEEE80211_DEAUTH_FRAME_LEN)
952 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
953 mgmt->sa, mgmt->da, mgmt->bssid, reason);
954 sta_info_destroy_addr(sdata, mgmt->sa);
957 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
958 struct ieee80211_mgmt *mgmt,
961 u16 auth_alg, auth_transaction;
963 sdata_assert_lock(sdata);
968 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
969 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
972 "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
973 mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
975 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
979 * IEEE 802.11 standard does not require authentication in IBSS
980 * networks and most implementations do not seem to use it.
981 * However, try to reply to authentication attempts if someone
982 * has actually implemented this.
984 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
985 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
988 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
989 struct ieee80211_mgmt *mgmt, size_t len,
990 struct ieee80211_rx_status *rx_status,
991 struct ieee802_11_elems *elems)
993 struct ieee80211_local *local = sdata->local;
994 struct cfg80211_bss *cbss;
995 struct ieee80211_bss *bss;
996 struct sta_info *sta;
997 struct ieee80211_channel *channel;
998 u64 beacon_timestamp, rx_timestamp;
1000 enum ieee80211_band band = rx_status->band;
1001 enum nl80211_bss_scan_width scan_width;
1002 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
1003 bool rates_updated = false;
1005 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1009 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1010 ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) {
1013 sta = sta_info_get(sdata, mgmt->sa);
1015 if (elems->supp_rates) {
1016 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1021 prev_rates = sta->sta.supp_rates[band];
1022 /* make sure mandatory rates are always added */
1023 scan_width = NL80211_BSS_CHAN_WIDTH_20;
1024 if (rx_status->flag & RX_FLAG_5MHZ)
1025 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1026 if (rx_status->flag & RX_FLAG_10MHZ)
1027 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1029 sta->sta.supp_rates[band] = supp_rates |
1030 ieee80211_mandatory_rates(sband,
1032 if (sta->sta.supp_rates[band] != prev_rates) {
1034 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1035 sta->sta.addr, prev_rates,
1036 sta->sta.supp_rates[band]);
1037 rates_updated = true;
1041 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1042 mgmt->sa, supp_rates);
1046 if (sta && elems->wmm_info)
1047 set_sta_flag(sta, WLAN_STA_WME);
1049 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1050 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1051 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1052 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1053 /* we both use HT */
1054 struct ieee80211_ht_cap htcap_ie;
1055 struct cfg80211_chan_def chandef;
1057 ieee80211_ht_oper_to_chandef(channel,
1058 elems->ht_operation,
1061 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1064 * fall back to HT20 if we don't use or use
1065 * the other extension channel
1067 if (chandef.center_freq1 !=
1068 sdata->u.ibss.chandef.center_freq1)
1069 htcap_ie.cap_info &=
1070 cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40);
1072 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(
1073 sdata, sband, &htcap_ie, sta);
1076 if (sta && rates_updated) {
1077 drv_sta_rc_update(local, sdata, &sta->sta,
1078 IEEE80211_RC_SUPP_RATES_CHANGED);
1079 rate_control_rate_init(sta);
1085 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1090 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1092 /* same for beacon and probe response */
1093 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1095 /* check if we need to merge IBSS */
1098 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1101 /* different channel */
1102 if (sdata->u.ibss.fixed_channel &&
1103 sdata->u.ibss.chandef.chan != cbss->channel)
1106 /* different SSID */
1107 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1108 memcmp(elems->ssid, sdata->u.ibss.ssid,
1109 sdata->u.ibss.ssid_len))
1112 /* process channel switch */
1113 if (sdata->vif.csa_active ||
1114 ieee80211_ibss_process_chanswitch(sdata, elems, true))
1118 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1121 /* we use a fixed BSSID */
1122 if (sdata->u.ibss.fixed_bssid)
1125 if (ieee80211_have_rx_timestamp(rx_status)) {
1126 /* time when timestamp field was received */
1128 ieee80211_calculate_rx_timestamp(local, rx_status,
1132 * second best option: get current TSF
1133 * (will return -1 if not supported)
1135 rx_timestamp = drv_get_tsf(local, sdata);
1139 "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1140 mgmt->sa, mgmt->bssid,
1141 (unsigned long long)rx_timestamp,
1142 (unsigned long long)beacon_timestamp,
1143 (unsigned long long)(rx_timestamp - beacon_timestamp),
1146 if (beacon_timestamp > rx_timestamp) {
1148 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1150 ieee80211_sta_join_ibss(sdata, bss);
1151 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1152 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1158 ieee80211_rx_bss_put(local, bss);
1161 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1162 const u8 *bssid, const u8 *addr,
1165 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1166 struct ieee80211_local *local = sdata->local;
1167 struct sta_info *sta;
1168 struct ieee80211_chanctx_conf *chanctx_conf;
1169 struct ieee80211_supported_band *sband;
1170 enum nl80211_bss_scan_width scan_width;
1174 * XXX: Consider removing the least recently used entry and
1175 * allow new one to be added.
1177 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1178 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1183 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1186 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1190 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1191 if (WARN_ON_ONCE(!chanctx_conf)) {
1195 band = chanctx_conf->def.chan->band;
1196 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1199 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1203 sta->last_rx = jiffies;
1205 /* make sure mandatory rates are always added */
1206 sband = local->hw.wiphy->bands[band];
1207 sta->sta.supp_rates[band] = supp_rates |
1208 ieee80211_mandatory_rates(sband, scan_width);
1210 spin_lock(&ifibss->incomplete_lock);
1211 list_add(&sta->list, &ifibss->incomplete_stations);
1212 spin_unlock(&ifibss->incomplete_lock);
1213 ieee80211_queue_work(&local->hw, &sdata->work);
1216 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1218 struct ieee80211_local *local = sdata->local;
1219 struct sta_info *sta, *tmp;
1220 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1221 unsigned long exp_rsn_time = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1223 mutex_lock(&local->sta_mtx);
1225 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1226 if (sdata != sta->sdata)
1229 if (time_after(jiffies, sta->last_rx + exp_time) ||
1230 (time_after(jiffies, sta->last_rx + exp_rsn_time) &&
1231 sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1232 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1233 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1234 "not authorized " : "", sta->sta.addr);
1236 WARN_ON(__sta_info_destroy(sta));
1240 mutex_unlock(&local->sta_mtx);
1244 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1247 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1249 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1250 enum nl80211_bss_scan_width scan_width;
1252 sdata_assert_lock(sdata);
1254 mod_timer(&ifibss->timer,
1255 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1257 ieee80211_ibss_sta_expire(sdata);
1259 if (time_before(jiffies, ifibss->last_scan_completed +
1260 IEEE80211_IBSS_MERGE_INTERVAL))
1263 if (ieee80211_sta_active_ibss(sdata))
1266 if (ifibss->fixed_channel)
1270 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1272 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1273 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1277 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1279 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1284 sdata_assert_lock(sdata);
1286 if (ifibss->fixed_bssid) {
1287 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1289 /* Generate random, not broadcast, locally administered BSSID. Mix in
1290 * own MAC address to make sure that devices that do not have proper
1291 * random number generator get different BSSID. */
1292 get_random_bytes(bssid, ETH_ALEN);
1293 for (i = 0; i < ETH_ALEN; i++)
1294 bssid[i] ^= sdata->vif.addr[i];
1299 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1301 capability = WLAN_CAPABILITY_IBSS;
1303 if (ifibss->privacy)
1304 capability |= WLAN_CAPABILITY_PRIVACY;
1306 sdata->drop_unencrypted = 0;
1308 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1309 &ifibss->chandef, ifibss->basic_rates,
1310 capability, 0, true);
1314 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1317 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1319 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1320 struct ieee80211_local *local = sdata->local;
1321 struct cfg80211_bss *cbss;
1322 struct ieee80211_channel *chan = NULL;
1323 const u8 *bssid = NULL;
1324 enum nl80211_bss_scan_width scan_width;
1328 sdata_assert_lock(sdata);
1330 active_ibss = ieee80211_sta_active_ibss(sdata);
1331 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1336 capability = WLAN_CAPABILITY_IBSS;
1337 if (ifibss->privacy)
1338 capability |= WLAN_CAPABILITY_PRIVACY;
1339 if (ifibss->fixed_bssid)
1340 bssid = ifibss->bssid;
1341 if (ifibss->fixed_channel)
1342 chan = ifibss->chandef.chan;
1343 if (!is_zero_ether_addr(ifibss->bssid))
1344 bssid = ifibss->bssid;
1345 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1346 ifibss->ssid, ifibss->ssid_len,
1347 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
1351 struct ieee80211_bss *bss;
1353 bss = (void *)cbss->priv;
1355 "sta_find_ibss: selected %pM current %pM\n",
1356 cbss->bssid, ifibss->bssid);
1358 "Selected IBSS BSSID %pM based on configured SSID\n",
1361 ieee80211_sta_join_ibss(sdata, bss);
1362 ieee80211_rx_bss_put(local, bss);
1366 /* if a fixed bssid and a fixed freq have been provided create the IBSS
1367 * directly and do not waste time scanning
1369 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1370 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1372 ieee80211_sta_create_ibss(sdata);
1377 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1379 /* Selected IBSS not found in current scan results - try to scan */
1380 if (time_after(jiffies, ifibss->last_scan_completed +
1381 IEEE80211_SCAN_INTERVAL)) {
1382 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1384 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1385 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1386 ifibss->ssid_len, chan,
1389 int interval = IEEE80211_SCAN_INTERVAL;
1391 if (time_after(jiffies, ifibss->ibss_join_req +
1392 IEEE80211_IBSS_JOIN_TIMEOUT))
1393 ieee80211_sta_create_ibss(sdata);
1395 mod_timer(&ifibss->timer,
1396 round_jiffies(jiffies + interval));
1400 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1401 struct sk_buff *req)
1403 struct ieee80211_mgmt *mgmt = (void *)req->data;
1404 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1405 struct ieee80211_local *local = sdata->local;
1406 int tx_last_beacon, len = req->len;
1407 struct sk_buff *skb;
1408 struct beacon_data *presp;
1411 sdata_assert_lock(sdata);
1413 presp = rcu_dereference_protected(ifibss->presp,
1414 lockdep_is_held(&sdata->wdev.mtx));
1416 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1417 len < 24 + 2 || !presp)
1420 tx_last_beacon = drv_tx_last_beacon(local);
1423 "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
1424 mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
1426 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1429 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1430 !is_broadcast_ether_addr(mgmt->bssid))
1433 end = ((u8 *) mgmt) + len;
1434 pos = mgmt->u.probe_req.variable;
1435 if (pos[0] != WLAN_EID_SSID ||
1436 pos + 2 + pos[1] > end) {
1437 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1442 (pos[1] != ifibss->ssid_len ||
1443 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1444 /* Ignore ProbeReq for foreign SSID */
1448 /* Reply with ProbeResp */
1449 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1453 skb_reserve(skb, local->tx_headroom);
1454 memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
1456 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1457 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1458 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1460 /* avoid excessive retries for probe request to wildcard SSIDs */
1462 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1464 ieee80211_tx_skb(sdata, skb);
1468 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1469 struct ieee80211_mgmt *mgmt, size_t len,
1470 struct ieee80211_rx_status *rx_status)
1473 struct ieee802_11_elems elems;
1475 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1476 offsetof(typeof(mgmt->u.beacon), variable));
1479 * either beacon or probe_resp but the variable field is at the
1482 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1486 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1489 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1492 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1493 struct sk_buff *skb)
1495 struct ieee80211_rx_status *rx_status;
1496 struct ieee80211_mgmt *mgmt;
1498 struct ieee802_11_elems elems;
1501 rx_status = IEEE80211_SKB_RXCB(skb);
1502 mgmt = (struct ieee80211_mgmt *) skb->data;
1503 fc = le16_to_cpu(mgmt->frame_control);
1507 if (!sdata->u.ibss.ssid_len)
1508 goto mgmt_out; /* not ready to merge yet */
1510 switch (fc & IEEE80211_FCTL_STYPE) {
1511 case IEEE80211_STYPE_PROBE_REQ:
1512 ieee80211_rx_mgmt_probe_req(sdata, skb);
1514 case IEEE80211_STYPE_PROBE_RESP:
1515 case IEEE80211_STYPE_BEACON:
1516 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1519 case IEEE80211_STYPE_AUTH:
1520 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1522 case IEEE80211_STYPE_DEAUTH:
1523 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1525 case IEEE80211_STYPE_ACTION:
1526 switch (mgmt->u.action.category) {
1527 case WLAN_CATEGORY_SPECTRUM_MGMT:
1528 ies_len = skb->len -
1529 offsetof(struct ieee80211_mgmt,
1530 u.action.u.chan_switch.variable);
1535 ieee802_11_parse_elems(
1536 mgmt->u.action.u.chan_switch.variable,
1537 ies_len, true, &elems);
1539 if (elems.parse_error)
1542 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1549 sdata_unlock(sdata);
1552 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1554 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1555 struct sta_info *sta;
1560 * Work could be scheduled after scan or similar
1561 * when we aren't even joined (or trying) with a
1564 if (!ifibss->ssid_len)
1567 spin_lock_bh(&ifibss->incomplete_lock);
1568 while (!list_empty(&ifibss->incomplete_stations)) {
1569 sta = list_first_entry(&ifibss->incomplete_stations,
1570 struct sta_info, list);
1571 list_del(&sta->list);
1572 spin_unlock_bh(&ifibss->incomplete_lock);
1574 ieee80211_ibss_finish_sta(sta);
1576 spin_lock_bh(&ifibss->incomplete_lock);
1578 spin_unlock_bh(&ifibss->incomplete_lock);
1580 switch (ifibss->state) {
1581 case IEEE80211_IBSS_MLME_SEARCH:
1582 ieee80211_sta_find_ibss(sdata);
1584 case IEEE80211_IBSS_MLME_JOINED:
1585 ieee80211_sta_merge_ibss(sdata);
1593 sdata_unlock(sdata);
1596 static void ieee80211_ibss_timer(unsigned long data)
1598 struct ieee80211_sub_if_data *sdata =
1599 (struct ieee80211_sub_if_data *) data;
1601 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1604 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1606 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1608 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1609 (unsigned long) sdata);
1610 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1611 spin_lock_init(&ifibss->incomplete_lock);
1612 INIT_WORK(&ifibss->csa_connection_drop_work,
1613 ieee80211_csa_connection_drop_work);
1616 /* scan finished notification */
1617 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1619 struct ieee80211_sub_if_data *sdata;
1621 mutex_lock(&local->iflist_mtx);
1622 list_for_each_entry(sdata, &local->interfaces, list) {
1623 if (!ieee80211_sdata_running(sdata))
1625 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1627 sdata->u.ibss.last_scan_completed = jiffies;
1628 ieee80211_queue_work(&local->hw, &sdata->work);
1630 mutex_unlock(&local->iflist_mtx);
1633 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1634 struct cfg80211_ibss_params *params)
1638 struct ieee80211_supported_band *sband;
1641 if (params->bssid) {
1642 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1643 sdata->u.ibss.fixed_bssid = true;
1645 sdata->u.ibss.fixed_bssid = false;
1647 sdata->u.ibss.privacy = params->privacy;
1648 sdata->u.ibss.control_port = params->control_port;
1649 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1650 sdata->u.ibss.basic_rates = params->basic_rates;
1652 /* fix basic_rates if channel does not support these rates */
1653 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef);
1654 sband = sdata->local->hw.wiphy->bands[params->chandef.chan->band];
1655 for (i = 0; i < sband->n_bitrates; i++) {
1656 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1657 sdata->u.ibss.basic_rates &= ~BIT(i);
1659 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1660 sizeof(params->mcast_rate));
1662 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1664 sdata->u.ibss.chandef = params->chandef;
1665 sdata->u.ibss.fixed_channel = params->channel_fixed;
1668 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1670 if (sdata->u.ibss.ie)
1671 sdata->u.ibss.ie_len = params->ie_len;
1674 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1675 sdata->u.ibss.ibss_join_req = jiffies;
1677 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1678 sdata->u.ibss.ssid_len = params->ssid_len;
1680 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa,
1681 sizeof(sdata->u.ibss.ht_capa));
1682 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask,
1683 sizeof(sdata->u.ibss.ht_capa_mask));
1686 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1687 * reserved, but an HT STA shall protect HT transmissions as though
1688 * the HT Protection field were set to non-HT mixed mode.
1690 * In an IBSS, the RIFS Mode field of the HT Operation element is
1691 * also reserved, but an HT STA shall operate as though this field
1695 sdata->vif.bss_conf.ht_operation_mode |=
1696 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1697 | IEEE80211_HT_PARAM_RIFS_MODE;
1699 changed |= BSS_CHANGED_HT;
1700 ieee80211_bss_info_change_notify(sdata, changed);
1702 sdata->smps_mode = IEEE80211_SMPS_OFF;
1703 sdata->needed_rx_chains = sdata->local->rx_chains;
1705 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1710 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1712 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1714 ieee80211_ibss_disconnect(sdata);
1715 ifibss->ssid_len = 0;
1716 memset(ifibss->bssid, 0, ETH_ALEN);
1719 kfree(sdata->u.ibss.ie);
1721 /* on the next join, re-program HT parameters */
1722 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1723 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1727 skb_queue_purge(&sdata->skb_queue);
1729 del_timer_sync(&sdata->u.ibss.timer);