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)
34 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
37 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
38 const u8 *bssid, const int beacon_int,
39 struct ieee80211_channel *chan,
40 const u32 basic_rates,
41 const u16 capability, u64 tsf,
44 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
45 struct ieee80211_local *local = sdata->local;
47 struct ieee80211_mgmt *mgmt;
49 struct ieee80211_supported_band *sband;
50 struct cfg80211_bss *bss;
52 u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
53 struct cfg80211_chan_def chandef;
54 struct beacon_data *presp;
57 sdata_assert_lock(sdata);
59 /* Reset own TSF to allow time synchronization work. */
60 drv_reset_tsf(local, sdata);
62 if (!ether_addr_equal(ifibss->bssid, bssid))
63 sta_info_flush(sdata);
65 /* if merging, indicate to driver that we leave the old IBSS */
66 if (sdata->vif.bss_conf.ibss_joined) {
67 sdata->vif.bss_conf.ibss_joined = false;
68 sdata->vif.bss_conf.ibss_creator = false;
69 sdata->vif.bss_conf.enable_beacon = false;
70 netif_carrier_off(sdata->dev);
71 ieee80211_bss_info_change_notify(sdata,
73 BSS_CHANGED_BEACON_ENABLED);
76 presp = rcu_dereference_protected(ifibss->presp,
77 lockdep_is_held(&sdata->wdev.mtx));
78 rcu_assign_pointer(ifibss->presp, NULL);
80 kfree_rcu(presp, rcu_head);
82 sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
84 cfg80211_chandef_create(&chandef, chan, ifibss->channel_type);
85 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) {
86 chandef.width = NL80211_CHAN_WIDTH_20;
87 chandef.center_freq1 = chan->center_freq;
90 ieee80211_vif_release_channel(sdata);
91 if (ieee80211_vif_use_channel(sdata, &chandef,
92 ifibss->fixed_channel ?
93 IEEE80211_CHANCTX_SHARED :
94 IEEE80211_CHANCTX_EXCLUSIVE)) {
95 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
99 memcpy(ifibss->bssid, bssid, ETH_ALEN);
101 sband = local->hw.wiphy->bands[chan->band];
103 /* Build IBSS probe response */
104 frame_len = sizeof(struct ieee80211_hdr_3addr) +
105 12 /* struct ieee80211_mgmt.u.beacon */ +
106 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
107 2 + 8 /* max Supported Rates */ +
108 3 /* max DS params */ +
109 4 /* IBSS params */ +
110 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
111 2 + sizeof(struct ieee80211_ht_cap) +
112 2 + sizeof(struct ieee80211_ht_operation) +
114 presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
118 presp->head = (void *)(presp + 1);
120 mgmt = (void *) presp->head;
121 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
122 IEEE80211_STYPE_PROBE_RESP);
123 eth_broadcast_addr(mgmt->da);
124 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
125 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
126 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
127 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
128 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
130 pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
132 *pos++ = WLAN_EID_SSID;
133 *pos++ = ifibss->ssid_len;
134 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
135 pos += ifibss->ssid_len;
137 rates = min_t(int, 8, sband->n_bitrates);
138 *pos++ = WLAN_EID_SUPP_RATES;
140 for (i = 0; i < rates; i++) {
141 int rate = sband->bitrates[i].bitrate;
143 if (basic_rates & BIT(i))
145 *pos++ = basic | (u8) (rate / 5);
148 if (sband->band == IEEE80211_BAND_2GHZ) {
149 *pos++ = WLAN_EID_DS_PARAMS;
151 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
154 *pos++ = WLAN_EID_IBSS_PARAMS;
156 /* FIX: set ATIM window based on scan results */
160 if (sband->n_bitrates > 8) {
161 *pos++ = WLAN_EID_EXT_SUPP_RATES;
162 *pos++ = sband->n_bitrates - 8;
163 for (i = 8; i < sband->n_bitrates; i++) {
164 int rate = sband->bitrates[i].bitrate;
166 if (basic_rates & BIT(i))
168 *pos++ = basic | (u8) (rate / 5);
172 if (ifibss->ie_len) {
173 memcpy(pos, ifibss->ie, ifibss->ie_len);
174 pos += ifibss->ie_len;
177 /* add HT capability and information IEs */
178 if (chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
179 chandef.width != NL80211_CHAN_WIDTH_5 &&
180 chandef.width != NL80211_CHAN_WIDTH_10 &&
181 sband->ht_cap.ht_supported) {
182 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
185 * Note: According to 802.11n-2009 9.13.3.1, HT Protection
186 * field and RIFS Mode are reserved in IBSS mode, therefore
189 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
193 if (local->hw.queues >= IEEE80211_NUM_ACS) {
194 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
195 *pos++ = 7; /* len */
196 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
199 *pos++ = 2; /* WME */
200 *pos++ = 0; /* WME info */
201 *pos++ = 1; /* WME ver */
202 *pos++ = 0; /* U-APSD no in use */
205 presp->head_len = pos - presp->head;
206 if (WARN_ON(presp->head_len > frame_len))
209 rcu_assign_pointer(ifibss->presp, presp);
211 sdata->vif.bss_conf.enable_beacon = true;
212 sdata->vif.bss_conf.beacon_int = beacon_int;
213 sdata->vif.bss_conf.basic_rates = basic_rates;
214 sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
215 memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
216 bss_change = BSS_CHANGED_BEACON_INT;
217 bss_change |= ieee80211_reset_erp_info(sdata);
218 bss_change |= BSS_CHANGED_BSSID;
219 bss_change |= BSS_CHANGED_BEACON;
220 bss_change |= BSS_CHANGED_BEACON_ENABLED;
221 bss_change |= BSS_CHANGED_BASIC_RATES;
222 bss_change |= BSS_CHANGED_HT;
223 bss_change |= BSS_CHANGED_IBSS;
224 bss_change |= BSS_CHANGED_SSID;
227 * In 5 GHz/802.11a, we can always use short slot time.
228 * (IEEE 802.11-2012 18.3.8.7)
230 * In 2.4GHz, we must always use long slots in IBSS for compatibility
232 * (IEEE 802.11-2012 19.4.5)
234 * HT follows these specifications (IEEE 802.11-2012 20.3.18)
236 sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ;
237 bss_change |= BSS_CHANGED_ERP_SLOT;
239 sdata->vif.bss_conf.ibss_joined = true;
240 sdata->vif.bss_conf.ibss_creator = creator;
241 ieee80211_bss_info_change_notify(sdata, bss_change);
243 ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates);
245 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
246 mod_timer(&ifibss->timer,
247 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
249 bss = cfg80211_inform_bss_frame(local->hw.wiphy, chan,
250 mgmt, presp->head_len, 0, GFP_KERNEL);
251 cfg80211_put_bss(local->hw.wiphy, bss);
252 netif_carrier_on(sdata->dev);
253 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
256 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
257 struct ieee80211_bss *bss)
259 struct cfg80211_bss *cbss =
260 container_of((void *)bss, struct cfg80211_bss, priv);
261 struct ieee80211_supported_band *sband;
264 u16 beacon_int = cbss->beacon_interval;
265 const struct cfg80211_bss_ies *ies;
268 sdata_assert_lock(sdata);
273 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
277 for (i = 0; i < bss->supp_rates_len; i++) {
278 int rate = (bss->supp_rates[i] & 0x7f) * 5;
279 bool is_basic = !!(bss->supp_rates[i] & 0x80);
281 for (j = 0; j < sband->n_bitrates; j++) {
282 if (sband->bitrates[j].bitrate == rate) {
284 basic_rates |= BIT(j);
291 ies = rcu_dereference(cbss->ies);
295 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
303 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta,
307 struct ieee80211_sub_if_data *sdata = sta->sdata;
310 memcpy(addr, sta->sta.addr, ETH_ALEN);
312 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
314 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
315 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
316 /* authorize the station only if the network is not RSN protected. If
317 * not wait for the userspace to authorize it */
318 if (!sta->sdata->u.ibss.control_port)
319 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
321 rate_control_rate_init(sta);
323 /* If it fails, maybe we raced another insertion? */
324 if (sta_info_insert_rcu(sta))
325 return sta_info_get(sdata, addr);
326 if (auth && !sdata->u.ibss.auth_frame_registrations) {
328 "TX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=1)\n",
329 sdata->vif.addr, addr, sdata->u.ibss.bssid);
330 ieee80211_send_auth(sdata, 1, WLAN_AUTH_OPEN, 0, NULL, 0,
331 addr, sdata->u.ibss.bssid, NULL, 0, 0, 0);
336 static struct sta_info *
337 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
338 const u8 *bssid, const u8 *addr,
339 u32 supp_rates, bool auth)
342 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
343 struct ieee80211_local *local = sdata->local;
344 struct sta_info *sta;
345 struct ieee80211_chanctx_conf *chanctx_conf;
346 struct ieee80211_supported_band *sband;
350 * XXX: Consider removing the least recently used entry and
351 * allow new one to be added.
353 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
354 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
360 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
365 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
371 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
372 if (WARN_ON_ONCE(!chanctx_conf))
374 band = chanctx_conf->def.chan->band;
377 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
383 sta->last_rx = jiffies;
385 /* make sure mandatory rates are always added */
386 sband = local->hw.wiphy->bands[band];
387 sta->sta.supp_rates[band] = supp_rates |
388 ieee80211_mandatory_rates(sband);
390 return ieee80211_ibss_finish_sta(sta, auth);
393 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
394 struct ieee80211_mgmt *mgmt,
397 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
399 if (len < IEEE80211_DEAUTH_FRAME_LEN)
402 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
403 mgmt->sa, mgmt->da, mgmt->bssid, reason);
404 sta_info_destroy_addr(sdata, mgmt->sa);
407 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
408 struct ieee80211_mgmt *mgmt,
411 u16 auth_alg, auth_transaction;
412 struct sta_info *sta;
413 u8 deauth_frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
415 sdata_assert_lock(sdata);
420 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
421 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
424 "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
425 mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
427 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
430 sta_info_destroy_addr(sdata, mgmt->sa);
431 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 0, false);
435 * if we have any problem in allocating the new station, we reply with a
436 * DEAUTH frame to tell the other end that we had a problem
439 ieee80211_send_deauth_disassoc(sdata, sdata->u.ibss.bssid,
440 IEEE80211_STYPE_DEAUTH,
441 WLAN_REASON_UNSPECIFIED, true,
447 * IEEE 802.11 standard does not require authentication in IBSS
448 * networks and most implementations do not seem to use it.
449 * However, try to reply to authentication attempts if someone
450 * has actually implemented this.
452 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
453 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
456 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
457 struct ieee80211_mgmt *mgmt, size_t len,
458 struct ieee80211_rx_status *rx_status,
459 struct ieee802_11_elems *elems)
461 struct ieee80211_local *local = sdata->local;
463 struct cfg80211_bss *cbss;
464 struct ieee80211_bss *bss;
465 struct sta_info *sta;
466 struct ieee80211_channel *channel;
467 u64 beacon_timestamp, rx_timestamp;
469 enum ieee80211_band band = rx_status->band;
470 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
471 bool rates_updated = false;
473 if (elems->ds_params)
474 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
477 freq = rx_status->freq;
479 channel = ieee80211_get_channel(local->hw.wiphy, freq);
481 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
484 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
485 ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) {
488 sta = sta_info_get(sdata, mgmt->sa);
490 if (elems->supp_rates) {
491 supp_rates = ieee80211_sta_get_rates(local, elems,
496 prev_rates = sta->sta.supp_rates[band];
497 /* make sure mandatory rates are always added */
498 sta->sta.supp_rates[band] = supp_rates |
499 ieee80211_mandatory_rates(sband);
501 if (sta->sta.supp_rates[band] != prev_rates) {
503 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
504 sta->sta.addr, prev_rates,
505 sta->sta.supp_rates[band]);
506 rates_updated = true;
510 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
511 mgmt->sa, supp_rates, true);
515 if (sta && elems->wmm_info)
516 set_sta_flag(sta, WLAN_STA_WME);
518 if (sta && elems->ht_operation && elems->ht_cap_elem &&
519 sdata->u.ibss.channel_type != NL80211_CHAN_NO_HT) {
521 struct ieee80211_ht_cap htcap_ie;
522 struct cfg80211_chan_def chandef;
524 ieee80211_ht_oper_to_chandef(channel,
528 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
531 * fall back to HT20 if we don't use or use
532 * the other extension channel
534 if (cfg80211_get_chandef_type(&chandef) !=
535 sdata->u.ibss.channel_type)
537 cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40);
539 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(
540 sdata, sband, &htcap_ie, sta);
543 if (sta && rates_updated) {
544 drv_sta_rc_update(local, sdata, &sta->sta,
545 IEEE80211_RC_SUPP_RATES_CHANGED);
546 rate_control_rate_init(sta);
552 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
557 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
559 /* same for beacon and probe response */
560 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
562 /* check if we need to merge IBSS */
564 /* we use a fixed BSSID */
565 if (sdata->u.ibss.fixed_bssid)
569 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
572 /* different channel */
573 if (sdata->u.ibss.fixed_channel &&
574 sdata->u.ibss.channel != cbss->channel)
578 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
579 memcmp(elems->ssid, sdata->u.ibss.ssid,
580 sdata->u.ibss.ssid_len))
584 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
587 if (ieee80211_have_rx_timestamp(rx_status)) {
588 /* time when timestamp field was received */
590 ieee80211_calculate_rx_timestamp(local, rx_status,
594 * second best option: get current TSF
595 * (will return -1 if not supported)
597 rx_timestamp = drv_get_tsf(local, sdata);
601 "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
602 mgmt->sa, mgmt->bssid,
603 (unsigned long long)rx_timestamp,
604 (unsigned long long)beacon_timestamp,
605 (unsigned long long)(rx_timestamp - beacon_timestamp),
608 if (beacon_timestamp > rx_timestamp) {
610 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
612 ieee80211_sta_join_ibss(sdata, bss);
613 supp_rates = ieee80211_sta_get_rates(local, elems, band, NULL);
614 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
620 ieee80211_rx_bss_put(local, bss);
623 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
624 const u8 *bssid, const u8 *addr,
627 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
628 struct ieee80211_local *local = sdata->local;
629 struct sta_info *sta;
630 struct ieee80211_chanctx_conf *chanctx_conf;
631 struct ieee80211_supported_band *sband;
635 * XXX: Consider removing the least recently used entry and
636 * allow new one to be added.
638 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
639 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
644 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
647 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
651 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
652 if (WARN_ON_ONCE(!chanctx_conf)) {
656 band = chanctx_conf->def.chan->band;
659 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
663 sta->last_rx = jiffies;
665 /* make sure mandatory rates are always added */
666 sband = local->hw.wiphy->bands[band];
667 sta->sta.supp_rates[band] = supp_rates |
668 ieee80211_mandatory_rates(sband);
670 spin_lock(&ifibss->incomplete_lock);
671 list_add(&sta->list, &ifibss->incomplete_stations);
672 spin_unlock(&ifibss->incomplete_lock);
673 ieee80211_queue_work(&local->hw, &sdata->work);
676 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
678 struct ieee80211_local *local = sdata->local;
680 struct sta_info *sta;
682 sdata_assert_lock(sdata);
686 list_for_each_entry_rcu(sta, &local->sta_list, list) {
687 if (sta->sdata == sdata &&
688 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
701 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
704 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
706 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
708 sdata_assert_lock(sdata);
710 mod_timer(&ifibss->timer,
711 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
713 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
715 if (time_before(jiffies, ifibss->last_scan_completed +
716 IEEE80211_IBSS_MERGE_INTERVAL))
719 if (ieee80211_sta_active_ibss(sdata))
722 if (ifibss->fixed_channel)
726 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
728 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
732 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
734 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
739 sdata_assert_lock(sdata);
741 if (ifibss->fixed_bssid) {
742 memcpy(bssid, ifibss->bssid, ETH_ALEN);
744 /* Generate random, not broadcast, locally administered BSSID. Mix in
745 * own MAC address to make sure that devices that do not have proper
746 * random number generator get different BSSID. */
747 get_random_bytes(bssid, ETH_ALEN);
748 for (i = 0; i < ETH_ALEN; i++)
749 bssid[i] ^= sdata->vif.addr[i];
754 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
756 capability = WLAN_CAPABILITY_IBSS;
759 capability |= WLAN_CAPABILITY_PRIVACY;
761 sdata->drop_unencrypted = 0;
763 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
764 ifibss->channel, ifibss->basic_rates,
765 capability, 0, true);
769 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
772 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
774 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
775 struct ieee80211_local *local = sdata->local;
776 struct cfg80211_bss *cbss;
777 struct ieee80211_channel *chan = NULL;
778 const u8 *bssid = NULL;
782 sdata_assert_lock(sdata);
784 active_ibss = ieee80211_sta_active_ibss(sdata);
785 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
790 capability = WLAN_CAPABILITY_IBSS;
792 capability |= WLAN_CAPABILITY_PRIVACY;
793 if (ifibss->fixed_bssid)
794 bssid = ifibss->bssid;
795 if (ifibss->fixed_channel)
796 chan = ifibss->channel;
797 if (!is_zero_ether_addr(ifibss->bssid))
798 bssid = ifibss->bssid;
799 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
800 ifibss->ssid, ifibss->ssid_len,
801 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
805 struct ieee80211_bss *bss;
807 bss = (void *)cbss->priv;
809 "sta_find_ibss: selected %pM current %pM\n",
810 cbss->bssid, ifibss->bssid);
812 "Selected IBSS BSSID %pM based on configured SSID\n",
815 ieee80211_sta_join_ibss(sdata, bss);
816 ieee80211_rx_bss_put(local, bss);
820 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
822 /* Selected IBSS not found in current scan results - try to scan */
823 if (time_after(jiffies, ifibss->last_scan_completed +
824 IEEE80211_SCAN_INTERVAL)) {
825 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
827 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
828 ifibss->ssid_len, chan);
830 int interval = IEEE80211_SCAN_INTERVAL;
832 if (time_after(jiffies, ifibss->ibss_join_req +
833 IEEE80211_IBSS_JOIN_TIMEOUT))
834 ieee80211_sta_create_ibss(sdata);
836 mod_timer(&ifibss->timer,
837 round_jiffies(jiffies + interval));
841 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
844 struct ieee80211_mgmt *mgmt = (void *)req->data;
845 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
846 struct ieee80211_local *local = sdata->local;
847 int tx_last_beacon, len = req->len;
849 struct beacon_data *presp;
852 sdata_assert_lock(sdata);
854 presp = rcu_dereference_protected(ifibss->presp,
855 lockdep_is_held(&sdata->wdev.mtx));
857 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
858 len < 24 + 2 || !presp)
861 tx_last_beacon = drv_tx_last_beacon(local);
864 "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
865 mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
867 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
870 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
871 !is_broadcast_ether_addr(mgmt->bssid))
874 end = ((u8 *) mgmt) + len;
875 pos = mgmt->u.probe_req.variable;
876 if (pos[0] != WLAN_EID_SSID ||
877 pos + 2 + pos[1] > end) {
878 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
883 (pos[1] != ifibss->ssid_len ||
884 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
885 /* Ignore ProbeReq for foreign SSID */
889 /* Reply with ProbeResp */
890 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
894 skb_reserve(skb, local->tx_headroom);
895 memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
897 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
898 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
899 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
900 ieee80211_tx_skb(sdata, skb);
904 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
905 struct ieee80211_mgmt *mgmt, size_t len,
906 struct ieee80211_rx_status *rx_status)
909 struct ieee802_11_elems elems;
911 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
912 offsetof(typeof(mgmt->u.beacon), variable));
915 * either beacon or probe_resp but the variable field is at the
918 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
922 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
925 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
928 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
931 struct ieee80211_rx_status *rx_status;
932 struct ieee80211_mgmt *mgmt;
935 rx_status = IEEE80211_SKB_RXCB(skb);
936 mgmt = (struct ieee80211_mgmt *) skb->data;
937 fc = le16_to_cpu(mgmt->frame_control);
941 if (!sdata->u.ibss.ssid_len)
942 goto mgmt_out; /* not ready to merge yet */
944 switch (fc & IEEE80211_FCTL_STYPE) {
945 case IEEE80211_STYPE_PROBE_REQ:
946 ieee80211_rx_mgmt_probe_req(sdata, skb);
948 case IEEE80211_STYPE_PROBE_RESP:
949 case IEEE80211_STYPE_BEACON:
950 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
953 case IEEE80211_STYPE_AUTH:
954 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
956 case IEEE80211_STYPE_DEAUTH:
957 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
965 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
967 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
968 struct sta_info *sta;
973 * Work could be scheduled after scan or similar
974 * when we aren't even joined (or trying) with a
977 if (!ifibss->ssid_len)
980 spin_lock_bh(&ifibss->incomplete_lock);
981 while (!list_empty(&ifibss->incomplete_stations)) {
982 sta = list_first_entry(&ifibss->incomplete_stations,
983 struct sta_info, list);
984 list_del(&sta->list);
985 spin_unlock_bh(&ifibss->incomplete_lock);
987 ieee80211_ibss_finish_sta(sta, true);
989 spin_lock_bh(&ifibss->incomplete_lock);
991 spin_unlock_bh(&ifibss->incomplete_lock);
993 switch (ifibss->state) {
994 case IEEE80211_IBSS_MLME_SEARCH:
995 ieee80211_sta_find_ibss(sdata);
997 case IEEE80211_IBSS_MLME_JOINED:
998 ieee80211_sta_merge_ibss(sdata);
1006 sdata_unlock(sdata);
1009 static void ieee80211_ibss_timer(unsigned long data)
1011 struct ieee80211_sub_if_data *sdata =
1012 (struct ieee80211_sub_if_data *) data;
1014 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1017 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1019 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1021 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1022 (unsigned long) sdata);
1023 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1024 spin_lock_init(&ifibss->incomplete_lock);
1027 /* scan finished notification */
1028 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1030 struct ieee80211_sub_if_data *sdata;
1032 mutex_lock(&local->iflist_mtx);
1033 list_for_each_entry(sdata, &local->interfaces, list) {
1034 if (!ieee80211_sdata_running(sdata))
1036 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1038 sdata->u.ibss.last_scan_completed = jiffies;
1039 ieee80211_queue_work(&local->hw, &sdata->work);
1041 mutex_unlock(&local->iflist_mtx);
1044 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1045 struct cfg80211_ibss_params *params)
1049 if (params->bssid) {
1050 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1051 sdata->u.ibss.fixed_bssid = true;
1053 sdata->u.ibss.fixed_bssid = false;
1055 sdata->u.ibss.privacy = params->privacy;
1056 sdata->u.ibss.control_port = params->control_port;
1057 sdata->u.ibss.basic_rates = params->basic_rates;
1058 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1059 sizeof(params->mcast_rate));
1061 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1063 sdata->u.ibss.channel = params->chandef.chan;
1064 sdata->u.ibss.channel_type =
1065 cfg80211_get_chandef_type(¶ms->chandef);
1066 sdata->u.ibss.fixed_channel = params->channel_fixed;
1069 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1071 if (sdata->u.ibss.ie)
1072 sdata->u.ibss.ie_len = params->ie_len;
1075 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1076 sdata->u.ibss.ibss_join_req = jiffies;
1078 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1079 sdata->u.ibss.ssid_len = params->ssid_len;
1082 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1083 * reserved, but an HT STA shall protect HT transmissions as though
1084 * the HT Protection field were set to non-HT mixed mode.
1086 * In an IBSS, the RIFS Mode field of the HT Operation element is
1087 * also reserved, but an HT STA shall operate as though this field
1091 sdata->vif.bss_conf.ht_operation_mode |=
1092 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1093 | IEEE80211_HT_PARAM_RIFS_MODE;
1095 changed |= BSS_CHANGED_HT;
1096 ieee80211_bss_info_change_notify(sdata, changed);
1098 sdata->smps_mode = IEEE80211_SMPS_OFF;
1099 sdata->needed_rx_chains = sdata->local->rx_chains;
1101 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1106 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1108 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1109 struct ieee80211_local *local = sdata->local;
1110 struct cfg80211_bss *cbss;
1113 struct sta_info *sta;
1114 struct beacon_data *presp;
1116 active_ibss = ieee80211_sta_active_ibss(sdata);
1118 if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) {
1119 capability = WLAN_CAPABILITY_IBSS;
1121 if (ifibss->privacy)
1122 capability |= WLAN_CAPABILITY_PRIVACY;
1124 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->channel,
1125 ifibss->bssid, ifibss->ssid,
1126 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
1127 WLAN_CAPABILITY_PRIVACY,
1131 cfg80211_unlink_bss(local->hw.wiphy, cbss);
1132 cfg80211_put_bss(local->hw.wiphy, cbss);
1136 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
1137 memset(ifibss->bssid, 0, ETH_ALEN);
1138 ifibss->ssid_len = 0;
1140 sta_info_flush(sdata);
1142 spin_lock_bh(&ifibss->incomplete_lock);
1143 while (!list_empty(&ifibss->incomplete_stations)) {
1144 sta = list_first_entry(&ifibss->incomplete_stations,
1145 struct sta_info, list);
1146 list_del(&sta->list);
1147 spin_unlock_bh(&ifibss->incomplete_lock);
1149 sta_info_free(local, sta);
1150 spin_lock_bh(&ifibss->incomplete_lock);
1152 spin_unlock_bh(&ifibss->incomplete_lock);
1154 netif_carrier_off(sdata->dev);
1157 kfree(sdata->u.ibss.ie);
1158 presp = rcu_dereference_protected(ifibss->presp,
1159 lockdep_is_held(&sdata->wdev.mtx));
1160 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
1161 sdata->vif.bss_conf.ibss_joined = false;
1162 sdata->vif.bss_conf.ibss_creator = false;
1163 sdata->vif.bss_conf.enable_beacon = false;
1164 sdata->vif.bss_conf.ssid_len = 0;
1165 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
1166 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
1171 skb_queue_purge(&sdata->skb_queue);
1173 del_timer_sync(&sdata->u.ibss.timer);