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;
48 struct ieee80211_mgmt *mgmt;
50 struct ieee80211_supported_band *sband;
51 struct cfg80211_bss *bss;
53 u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
54 struct cfg80211_chan_def chandef;
56 lockdep_assert_held(&ifibss->mtx);
58 /* Reset own TSF to allow time synchronization work. */
59 drv_reset_tsf(local, sdata);
62 RCU_INIT_POINTER(ifibss->presp, NULL);
64 skb->data = skb->head;
66 skb_reset_tail_pointer(skb);
67 skb_reserve(skb, sdata->local->hw.extra_tx_headroom);
69 if (!ether_addr_equal(ifibss->bssid, bssid))
70 sta_info_flush(sdata);
72 /* if merging, indicate to driver that we leave the old IBSS */
73 if (sdata->vif.bss_conf.ibss_joined) {
74 sdata->vif.bss_conf.ibss_joined = false;
75 sdata->vif.bss_conf.ibss_creator = false;
76 netif_carrier_off(sdata->dev);
77 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IBSS);
80 sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
82 cfg80211_chandef_create(&chandef, chan, ifibss->channel_type);
83 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) {
84 chandef.width = NL80211_CHAN_WIDTH_20;
85 chandef.center_freq1 = chan->center_freq;
88 ieee80211_vif_release_channel(sdata);
89 if (ieee80211_vif_use_channel(sdata, &chandef,
90 ifibss->fixed_channel ?
91 IEEE80211_CHANCTX_SHARED :
92 IEEE80211_CHANCTX_EXCLUSIVE)) {
93 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
97 memcpy(ifibss->bssid, bssid, ETH_ALEN);
99 sband = local->hw.wiphy->bands[chan->band];
101 /* build supported rates array */
103 for (i = 0; i < sband->n_bitrates; i++) {
104 int rate = sband->bitrates[i].bitrate;
106 if (basic_rates & BIT(i))
108 *pos++ = basic | (u8) (rate / 5);
111 /* Build IBSS probe response */
112 mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon));
113 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
114 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
115 IEEE80211_STYPE_PROBE_RESP);
116 eth_broadcast_addr(mgmt->da);
117 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
118 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
119 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
120 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
121 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
123 pos = skb_put(skb, 2 + ifibss->ssid_len);
124 *pos++ = WLAN_EID_SSID;
125 *pos++ = ifibss->ssid_len;
126 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
128 rates = sband->n_bitrates;
131 pos = skb_put(skb, 2 + rates);
132 *pos++ = WLAN_EID_SUPP_RATES;
134 memcpy(pos, supp_rates, rates);
136 if (sband->band == IEEE80211_BAND_2GHZ) {
137 pos = skb_put(skb, 2 + 1);
138 *pos++ = WLAN_EID_DS_PARAMS;
140 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
143 pos = skb_put(skb, 2 + 2);
144 *pos++ = WLAN_EID_IBSS_PARAMS;
146 /* FIX: set ATIM window based on scan results */
150 if (sband->n_bitrates > 8) {
151 rates = sband->n_bitrates - 8;
152 pos = skb_put(skb, 2 + rates);
153 *pos++ = WLAN_EID_EXT_SUPP_RATES;
155 memcpy(pos, &supp_rates[8], rates);
159 memcpy(skb_put(skb, ifibss->ie_len),
160 ifibss->ie, ifibss->ie_len);
162 /* add HT capability and information IEs */
163 if (chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
164 sband->ht_cap.ht_supported) {
165 pos = skb_put(skb, 4 +
166 sizeof(struct ieee80211_ht_cap) +
167 sizeof(struct ieee80211_ht_operation));
168 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
171 * Note: According to 802.11n-2009 9.13.3.1, HT Protection
172 * field and RIFS Mode are reserved in IBSS mode, therefore
175 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
179 if (local->hw.queues >= IEEE80211_NUM_ACS) {
180 pos = skb_put(skb, 9);
181 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
182 *pos++ = 7; /* len */
183 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
186 *pos++ = 2; /* WME */
187 *pos++ = 0; /* WME info */
188 *pos++ = 1; /* WME ver */
189 *pos++ = 0; /* U-APSD no in use */
192 rcu_assign_pointer(ifibss->presp, skb);
194 sdata->vif.bss_conf.enable_beacon = true;
195 sdata->vif.bss_conf.beacon_int = beacon_int;
196 sdata->vif.bss_conf.basic_rates = basic_rates;
197 bss_change = BSS_CHANGED_BEACON_INT;
198 bss_change |= ieee80211_reset_erp_info(sdata);
199 bss_change |= BSS_CHANGED_BSSID;
200 bss_change |= BSS_CHANGED_BEACON;
201 bss_change |= BSS_CHANGED_BEACON_ENABLED;
202 bss_change |= BSS_CHANGED_BASIC_RATES;
203 bss_change |= BSS_CHANGED_HT;
204 bss_change |= BSS_CHANGED_IBSS;
207 * In 5 GHz/802.11a, we can always use short slot time.
208 * (IEEE 802.11-2012 18.3.8.7)
210 * In 2.4GHz, we must always use long slots in IBSS for compatibility
212 * (IEEE 802.11-2012 19.4.5)
214 * HT follows these specifications (IEEE 802.11-2012 20.3.18)
216 sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ;
217 bss_change |= BSS_CHANGED_ERP_SLOT;
219 sdata->vif.bss_conf.ibss_joined = true;
220 sdata->vif.bss_conf.ibss_creator = creator;
221 ieee80211_bss_info_change_notify(sdata, bss_change);
223 ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates);
225 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
226 mod_timer(&ifibss->timer,
227 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
229 bss = cfg80211_inform_bss_frame(local->hw.wiphy, chan,
230 mgmt, skb->len, 0, GFP_KERNEL);
231 cfg80211_put_bss(local->hw.wiphy, bss);
232 netif_carrier_on(sdata->dev);
233 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
236 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
237 struct ieee80211_bss *bss)
239 struct cfg80211_bss *cbss =
240 container_of((void *)bss, struct cfg80211_bss, priv);
241 struct ieee80211_supported_band *sband;
244 u16 beacon_int = cbss->beacon_interval;
245 const struct cfg80211_bss_ies *ies;
248 lockdep_assert_held(&sdata->u.ibss.mtx);
253 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
257 for (i = 0; i < bss->supp_rates_len; i++) {
258 int rate = (bss->supp_rates[i] & 0x7f) * 5;
259 bool is_basic = !!(bss->supp_rates[i] & 0x80);
261 for (j = 0; j < sband->n_bitrates; j++) {
262 if (sband->bitrates[j].bitrate == rate) {
264 basic_rates |= BIT(j);
271 ies = rcu_dereference(cbss->ies);
275 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
283 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta,
287 struct ieee80211_sub_if_data *sdata = sta->sdata;
290 memcpy(addr, sta->sta.addr, ETH_ALEN);
292 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
294 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
295 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
296 /* authorize the station only if the network is not RSN protected. If
297 * not wait for the userspace to authorize it */
298 if (!sta->sdata->u.ibss.control_port)
299 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
301 rate_control_rate_init(sta);
303 /* If it fails, maybe we raced another insertion? */
304 if (sta_info_insert_rcu(sta))
305 return sta_info_get(sdata, addr);
306 if (auth && !sdata->u.ibss.auth_frame_registrations) {
308 "TX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=1)\n",
309 sdata->vif.addr, addr, sdata->u.ibss.bssid);
310 ieee80211_send_auth(sdata, 1, WLAN_AUTH_OPEN, 0, NULL, 0,
311 addr, sdata->u.ibss.bssid, NULL, 0, 0, 0);
316 static struct sta_info *
317 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
318 const u8 *bssid, const u8 *addr,
319 u32 supp_rates, bool auth)
322 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
323 struct ieee80211_local *local = sdata->local;
324 struct sta_info *sta;
325 struct ieee80211_chanctx_conf *chanctx_conf;
329 * XXX: Consider removing the least recently used entry and
330 * allow new one to be added.
332 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
333 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
339 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
344 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
350 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
351 if (WARN_ON_ONCE(!chanctx_conf))
353 band = chanctx_conf->def.chan->band;
356 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
362 sta->last_rx = jiffies;
364 /* make sure mandatory rates are always added */
365 sta->sta.supp_rates[band] = supp_rates |
366 ieee80211_mandatory_rates(local, band);
368 return ieee80211_ibss_finish_sta(sta, auth);
371 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
372 struct ieee80211_mgmt *mgmt,
375 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
377 if (len < IEEE80211_DEAUTH_FRAME_LEN)
380 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
381 mgmt->sa, mgmt->da, mgmt->bssid, reason);
382 sta_info_destroy_addr(sdata, mgmt->sa);
385 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
386 struct ieee80211_mgmt *mgmt,
389 u16 auth_alg, auth_transaction;
390 struct sta_info *sta;
391 u8 deauth_frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
393 lockdep_assert_held(&sdata->u.ibss.mtx);
398 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
399 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
402 "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
403 mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
405 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
408 sta_info_destroy_addr(sdata, mgmt->sa);
409 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 0, false);
413 * if we have any problem in allocating the new station, we reply with a
414 * DEAUTH frame to tell the other end that we had a problem
417 ieee80211_send_deauth_disassoc(sdata, sdata->u.ibss.bssid,
418 IEEE80211_STYPE_DEAUTH,
419 WLAN_REASON_UNSPECIFIED, true,
425 * IEEE 802.11 standard does not require authentication in IBSS
426 * networks and most implementations do not seem to use it.
427 * However, try to reply to authentication attempts if someone
428 * has actually implemented this.
430 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
431 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
434 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
435 struct ieee80211_mgmt *mgmt, size_t len,
436 struct ieee80211_rx_status *rx_status,
437 struct ieee802_11_elems *elems)
439 struct ieee80211_local *local = sdata->local;
441 struct cfg80211_bss *cbss;
442 struct ieee80211_bss *bss;
443 struct sta_info *sta;
444 struct ieee80211_channel *channel;
445 u64 beacon_timestamp, rx_timestamp;
447 enum ieee80211_band band = rx_status->band;
448 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
449 bool rates_updated = false;
451 if (elems->ds_params && elems->ds_params_len == 1)
452 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
455 freq = rx_status->freq;
457 channel = ieee80211_get_channel(local->hw.wiphy, freq);
459 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
462 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
463 ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) {
466 sta = sta_info_get(sdata, mgmt->sa);
468 if (elems->supp_rates) {
469 supp_rates = ieee80211_sta_get_rates(local, elems,
474 prev_rates = sta->sta.supp_rates[band];
475 /* make sure mandatory rates are always added */
476 sta->sta.supp_rates[band] = supp_rates |
477 ieee80211_mandatory_rates(local, band);
479 if (sta->sta.supp_rates[band] != prev_rates) {
481 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
482 sta->sta.addr, prev_rates,
483 sta->sta.supp_rates[band]);
484 rates_updated = true;
488 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
489 mgmt->sa, supp_rates, true);
493 if (sta && elems->wmm_info)
494 set_sta_flag(sta, WLAN_STA_WME);
496 if (sta && elems->ht_operation && elems->ht_cap_elem &&
497 sdata->u.ibss.channel_type != NL80211_CHAN_NO_HT) {
499 struct ieee80211_ht_cap htcap_ie;
500 struct cfg80211_chan_def chandef;
502 ieee80211_ht_oper_to_chandef(channel,
506 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
509 * fall back to HT20 if we don't use or use
510 * the other extension channel
512 if (cfg80211_get_chandef_type(&chandef) !=
513 sdata->u.ibss.channel_type)
515 cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40);
517 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(
518 sdata, sband, &htcap_ie, sta);
521 if (sta && rates_updated) {
522 drv_sta_rc_update(local, sdata, &sta->sta,
523 IEEE80211_RC_SUPP_RATES_CHANGED);
524 rate_control_rate_init(sta);
530 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
535 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
537 /* same for beacon and probe response */
538 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
540 /* check if we need to merge IBSS */
542 /* we use a fixed BSSID */
543 if (sdata->u.ibss.fixed_bssid)
547 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
550 /* different channel */
551 if (sdata->u.ibss.fixed_channel &&
552 sdata->u.ibss.channel != cbss->channel)
556 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
557 memcmp(elems->ssid, sdata->u.ibss.ssid,
558 sdata->u.ibss.ssid_len))
562 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
565 if (ieee80211_have_rx_timestamp(rx_status)) {
566 /* time when timestamp field was received */
568 ieee80211_calculate_rx_timestamp(local, rx_status,
572 * second best option: get current TSF
573 * (will return -1 if not supported)
575 rx_timestamp = drv_get_tsf(local, sdata);
579 "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
580 mgmt->sa, mgmt->bssid,
581 (unsigned long long)rx_timestamp,
582 (unsigned long long)beacon_timestamp,
583 (unsigned long long)(rx_timestamp - beacon_timestamp),
586 if (beacon_timestamp > rx_timestamp) {
588 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
590 ieee80211_sta_join_ibss(sdata, bss);
591 supp_rates = ieee80211_sta_get_rates(local, elems, band, NULL);
592 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
598 ieee80211_rx_bss_put(local, bss);
601 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
602 const u8 *bssid, const u8 *addr,
605 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
606 struct ieee80211_local *local = sdata->local;
607 struct sta_info *sta;
608 struct ieee80211_chanctx_conf *chanctx_conf;
612 * XXX: Consider removing the least recently used entry and
613 * allow new one to be added.
615 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
616 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
621 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
624 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
628 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
629 if (WARN_ON_ONCE(!chanctx_conf)) {
633 band = chanctx_conf->def.chan->band;
636 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
640 sta->last_rx = jiffies;
642 /* make sure mandatory rates are always added */
643 sta->sta.supp_rates[band] = supp_rates |
644 ieee80211_mandatory_rates(local, band);
646 spin_lock(&ifibss->incomplete_lock);
647 list_add(&sta->list, &ifibss->incomplete_stations);
648 spin_unlock(&ifibss->incomplete_lock);
649 ieee80211_queue_work(&local->hw, &sdata->work);
652 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
654 struct ieee80211_local *local = sdata->local;
656 struct sta_info *sta;
658 lockdep_assert_held(&sdata->u.ibss.mtx);
662 list_for_each_entry_rcu(sta, &local->sta_list, list) {
663 if (sta->sdata == sdata &&
664 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
677 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
680 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
682 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
684 lockdep_assert_held(&ifibss->mtx);
686 mod_timer(&ifibss->timer,
687 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
689 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
691 if (time_before(jiffies, ifibss->last_scan_completed +
692 IEEE80211_IBSS_MERGE_INTERVAL))
695 if (ieee80211_sta_active_ibss(sdata))
698 if (ifibss->fixed_channel)
702 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
704 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
708 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
710 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
715 lockdep_assert_held(&ifibss->mtx);
717 if (ifibss->fixed_bssid) {
718 memcpy(bssid, ifibss->bssid, ETH_ALEN);
720 /* Generate random, not broadcast, locally administered BSSID. Mix in
721 * own MAC address to make sure that devices that do not have proper
722 * random number generator get different BSSID. */
723 get_random_bytes(bssid, ETH_ALEN);
724 for (i = 0; i < ETH_ALEN; i++)
725 bssid[i] ^= sdata->vif.addr[i];
730 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
732 capability = WLAN_CAPABILITY_IBSS;
735 capability |= WLAN_CAPABILITY_PRIVACY;
737 sdata->drop_unencrypted = 0;
739 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
740 ifibss->channel, ifibss->basic_rates,
741 capability, 0, true);
745 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
748 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
750 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
751 struct ieee80211_local *local = sdata->local;
752 struct cfg80211_bss *cbss;
753 struct ieee80211_channel *chan = NULL;
754 const u8 *bssid = NULL;
758 lockdep_assert_held(&ifibss->mtx);
760 active_ibss = ieee80211_sta_active_ibss(sdata);
761 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
766 capability = WLAN_CAPABILITY_IBSS;
768 capability |= WLAN_CAPABILITY_PRIVACY;
769 if (ifibss->fixed_bssid)
770 bssid = ifibss->bssid;
771 if (ifibss->fixed_channel)
772 chan = ifibss->channel;
773 if (!is_zero_ether_addr(ifibss->bssid))
774 bssid = ifibss->bssid;
775 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
776 ifibss->ssid, ifibss->ssid_len,
777 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
781 struct ieee80211_bss *bss;
783 bss = (void *)cbss->priv;
785 "sta_find_ibss: selected %pM current %pM\n",
786 cbss->bssid, ifibss->bssid);
788 "Selected IBSS BSSID %pM based on configured SSID\n",
791 ieee80211_sta_join_ibss(sdata, bss);
792 ieee80211_rx_bss_put(local, bss);
796 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
798 /* Selected IBSS not found in current scan results - try to scan */
799 if (time_after(jiffies, ifibss->last_scan_completed +
800 IEEE80211_SCAN_INTERVAL)) {
801 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
803 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
804 ifibss->ssid_len, chan);
806 int interval = IEEE80211_SCAN_INTERVAL;
808 if (time_after(jiffies, ifibss->ibss_join_req +
809 IEEE80211_IBSS_JOIN_TIMEOUT))
810 ieee80211_sta_create_ibss(sdata);
812 mod_timer(&ifibss->timer,
813 round_jiffies(jiffies + interval));
817 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
820 struct ieee80211_mgmt *mgmt = (void *)req->data;
821 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
822 struct ieee80211_local *local = sdata->local;
823 int tx_last_beacon, len = req->len;
825 struct ieee80211_mgmt *resp;
826 struct sk_buff *presp;
829 lockdep_assert_held(&ifibss->mtx);
831 presp = rcu_dereference_protected(ifibss->presp,
832 lockdep_is_held(&ifibss->mtx));
834 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
835 len < 24 + 2 || !presp)
838 tx_last_beacon = drv_tx_last_beacon(local);
841 "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
842 mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
844 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
847 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
848 !is_broadcast_ether_addr(mgmt->bssid))
851 end = ((u8 *) mgmt) + len;
852 pos = mgmt->u.probe_req.variable;
853 if (pos[0] != WLAN_EID_SSID ||
854 pos + 2 + pos[1] > end) {
855 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
860 (pos[1] != ifibss->ssid_len ||
861 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
862 /* Ignore ProbeReq for foreign SSID */
866 /* Reply with ProbeResp */
867 skb = skb_copy(presp, GFP_KERNEL);
871 resp = (struct ieee80211_mgmt *) skb->data;
872 memcpy(resp->da, mgmt->sa, ETH_ALEN);
873 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", resp->da);
874 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
875 ieee80211_tx_skb(sdata, skb);
879 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
880 struct ieee80211_mgmt *mgmt, size_t len,
881 struct ieee80211_rx_status *rx_status)
884 struct ieee802_11_elems elems;
886 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
887 offsetof(typeof(mgmt->u.beacon), variable));
890 * either beacon or probe_resp but the variable field is at the
893 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
897 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
900 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
903 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
906 struct ieee80211_rx_status *rx_status;
907 struct ieee80211_mgmt *mgmt;
910 rx_status = IEEE80211_SKB_RXCB(skb);
911 mgmt = (struct ieee80211_mgmt *) skb->data;
912 fc = le16_to_cpu(mgmt->frame_control);
914 mutex_lock(&sdata->u.ibss.mtx);
916 if (!sdata->u.ibss.ssid_len)
917 goto mgmt_out; /* not ready to merge yet */
919 switch (fc & IEEE80211_FCTL_STYPE) {
920 case IEEE80211_STYPE_PROBE_REQ:
921 ieee80211_rx_mgmt_probe_req(sdata, skb);
923 case IEEE80211_STYPE_PROBE_RESP:
924 case IEEE80211_STYPE_BEACON:
925 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
928 case IEEE80211_STYPE_AUTH:
929 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
931 case IEEE80211_STYPE_DEAUTH:
932 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
937 mutex_unlock(&sdata->u.ibss.mtx);
940 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
942 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
943 struct sta_info *sta;
945 mutex_lock(&ifibss->mtx);
948 * Work could be scheduled after scan or similar
949 * when we aren't even joined (or trying) with a
952 if (!ifibss->ssid_len)
955 spin_lock_bh(&ifibss->incomplete_lock);
956 while (!list_empty(&ifibss->incomplete_stations)) {
957 sta = list_first_entry(&ifibss->incomplete_stations,
958 struct sta_info, list);
959 list_del(&sta->list);
960 spin_unlock_bh(&ifibss->incomplete_lock);
962 ieee80211_ibss_finish_sta(sta, true);
964 spin_lock_bh(&ifibss->incomplete_lock);
966 spin_unlock_bh(&ifibss->incomplete_lock);
968 switch (ifibss->state) {
969 case IEEE80211_IBSS_MLME_SEARCH:
970 ieee80211_sta_find_ibss(sdata);
972 case IEEE80211_IBSS_MLME_JOINED:
973 ieee80211_sta_merge_ibss(sdata);
981 mutex_unlock(&ifibss->mtx);
984 static void ieee80211_ibss_timer(unsigned long data)
986 struct ieee80211_sub_if_data *sdata =
987 (struct ieee80211_sub_if_data *) data;
988 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
989 struct ieee80211_local *local = sdata->local;
991 if (local->quiescing) {
992 ifibss->timer_running = true;
996 ieee80211_queue_work(&local->hw, &sdata->work);
1000 void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata)
1002 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1004 if (del_timer_sync(&ifibss->timer))
1005 ifibss->timer_running = true;
1008 void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata)
1010 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1012 if (ifibss->timer_running) {
1013 add_timer(&ifibss->timer);
1014 ifibss->timer_running = false;
1019 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1021 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1023 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1024 (unsigned long) sdata);
1025 mutex_init(&ifibss->mtx);
1026 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1027 spin_lock_init(&ifibss->incomplete_lock);
1030 /* scan finished notification */
1031 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1033 struct ieee80211_sub_if_data *sdata;
1035 mutex_lock(&local->iflist_mtx);
1036 list_for_each_entry(sdata, &local->interfaces, list) {
1037 if (!ieee80211_sdata_running(sdata))
1039 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1041 sdata->u.ibss.last_scan_completed = jiffies;
1042 ieee80211_queue_work(&local->hw, &sdata->work);
1044 mutex_unlock(&local->iflist_mtx);
1047 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1048 struct cfg80211_ibss_params *params)
1050 struct sk_buff *skb;
1053 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom +
1054 sizeof(struct ieee80211_hdr_3addr) +
1055 12 /* struct ieee80211_mgmt.u.beacon */ +
1056 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
1057 2 + 8 /* max Supported Rates */ +
1058 3 /* max DS params */ +
1059 4 /* IBSS params */ +
1060 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
1061 2 + sizeof(struct ieee80211_ht_cap) +
1062 2 + sizeof(struct ieee80211_ht_operation) +
1067 mutex_lock(&sdata->u.ibss.mtx);
1069 if (params->bssid) {
1070 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1071 sdata->u.ibss.fixed_bssid = true;
1073 sdata->u.ibss.fixed_bssid = false;
1075 sdata->u.ibss.privacy = params->privacy;
1076 sdata->u.ibss.control_port = params->control_port;
1077 sdata->u.ibss.basic_rates = params->basic_rates;
1078 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1079 sizeof(params->mcast_rate));
1081 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1083 sdata->u.ibss.channel = params->chandef.chan;
1084 sdata->u.ibss.channel_type =
1085 cfg80211_get_chandef_type(¶ms->chandef);
1086 sdata->u.ibss.fixed_channel = params->channel_fixed;
1089 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1091 if (sdata->u.ibss.ie)
1092 sdata->u.ibss.ie_len = params->ie_len;
1095 sdata->u.ibss.skb = skb;
1096 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1097 sdata->u.ibss.ibss_join_req = jiffies;
1099 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1100 sdata->u.ibss.ssid_len = params->ssid_len;
1102 mutex_unlock(&sdata->u.ibss.mtx);
1105 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1106 * reserved, but an HT STA shall protect HT transmissions as though
1107 * the HT Protection field were set to non-HT mixed mode.
1109 * In an IBSS, the RIFS Mode field of the HT Operation element is
1110 * also reserved, but an HT STA shall operate as though this field
1114 sdata->vif.bss_conf.ht_operation_mode |=
1115 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1116 | IEEE80211_HT_PARAM_RIFS_MODE;
1118 changed |= BSS_CHANGED_HT;
1119 ieee80211_bss_info_change_notify(sdata, changed);
1121 sdata->smps_mode = IEEE80211_SMPS_OFF;
1122 sdata->needed_rx_chains = sdata->local->rx_chains;
1124 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1129 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1131 struct sk_buff *skb;
1132 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1133 struct ieee80211_local *local = sdata->local;
1134 struct cfg80211_bss *cbss;
1137 struct sta_info *sta;
1139 mutex_lock(&sdata->u.ibss.mtx);
1141 active_ibss = ieee80211_sta_active_ibss(sdata);
1143 if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) {
1144 capability = WLAN_CAPABILITY_IBSS;
1146 if (ifibss->privacy)
1147 capability |= WLAN_CAPABILITY_PRIVACY;
1149 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->channel,
1150 ifibss->bssid, ifibss->ssid,
1151 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
1152 WLAN_CAPABILITY_PRIVACY,
1156 cfg80211_unlink_bss(local->hw.wiphy, cbss);
1157 cfg80211_put_bss(local->hw.wiphy, cbss);
1161 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
1162 memset(ifibss->bssid, 0, ETH_ALEN);
1163 ifibss->ssid_len = 0;
1165 sta_info_flush(sdata);
1167 spin_lock_bh(&ifibss->incomplete_lock);
1168 while (!list_empty(&ifibss->incomplete_stations)) {
1169 sta = list_first_entry(&ifibss->incomplete_stations,
1170 struct sta_info, list);
1171 list_del(&sta->list);
1172 spin_unlock_bh(&ifibss->incomplete_lock);
1174 sta_info_free(local, sta);
1175 spin_lock_bh(&ifibss->incomplete_lock);
1177 spin_unlock_bh(&ifibss->incomplete_lock);
1179 netif_carrier_off(sdata->dev);
1182 kfree(sdata->u.ibss.ie);
1183 skb = rcu_dereference_protected(sdata->u.ibss.presp,
1184 lockdep_is_held(&sdata->u.ibss.mtx));
1185 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
1186 sdata->vif.bss_conf.ibss_joined = false;
1187 sdata->vif.bss_conf.ibss_creator = false;
1188 sdata->vif.bss_conf.enable_beacon = false;
1189 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
1190 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
1195 skb_queue_purge(&sdata->skb_queue);
1197 del_timer_sync(&sdata->u.ibss.timer);
1199 mutex_unlock(&sdata->u.ibss.mtx);