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>
23 #include <asm/unaligned.h>
25 #include "ieee80211_i.h"
26 #include "driver-ops.h"
29 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
30 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
31 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
33 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
34 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
36 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
39 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
40 const u8 *bssid, const int beacon_int,
41 struct ieee80211_channel *chan,
42 const u32 basic_rates,
43 const u16 capability, u64 tsf)
45 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
46 struct ieee80211_local *local = sdata->local;
49 struct ieee80211_mgmt *mgmt;
51 struct ieee80211_supported_band *sband;
52 struct cfg80211_bss *bss;
54 u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
55 enum nl80211_channel_type channel_type;
57 lockdep_assert_held(&ifibss->mtx);
59 /* Reset own TSF to allow time synchronization work. */
60 drv_reset_tsf(local, sdata);
63 RCU_INIT_POINTER(ifibss->presp, NULL);
65 skb->data = skb->head;
67 skb_reset_tail_pointer(skb);
68 skb_reserve(skb, sdata->local->hw.extra_tx_headroom);
70 if (memcmp(ifibss->bssid, bssid, ETH_ALEN))
71 sta_info_flush(sdata->local, sdata);
73 /* if merging, indicate to driver that we leave the old IBSS */
74 if (sdata->vif.bss_conf.ibss_joined) {
75 sdata->vif.bss_conf.ibss_joined = false;
76 netif_carrier_off(sdata->dev);
77 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IBSS);
80 memcpy(ifibss->bssid, bssid, ETH_ALEN);
82 sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
84 local->oper_channel = chan;
85 channel_type = ifibss->channel_type;
86 if (channel_type > NL80211_CHAN_HT20 &&
87 !cfg80211_can_beacon_sec_chan(local->hw.wiphy, chan, channel_type))
88 channel_type = NL80211_CHAN_HT20;
89 if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
90 /* can only fail due to HT40+/- mismatch */
91 channel_type = NL80211_CHAN_HT20;
92 WARN_ON(!ieee80211_set_channel_type(local, sdata,
95 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
97 sband = local->hw.wiphy->bands[chan->band];
99 /* build supported rates array */
101 for (i = 0; i < sband->n_bitrates; i++) {
102 int rate = sband->bitrates[i].bitrate;
104 if (basic_rates & BIT(i))
106 *pos++ = basic | (u8) (rate / 5);
109 /* Build IBSS probe response */
110 mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon));
111 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
112 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
113 IEEE80211_STYPE_PROBE_RESP);
114 memset(mgmt->da, 0xff, ETH_ALEN);
115 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
116 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
117 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
118 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
119 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
121 pos = skb_put(skb, 2 + ifibss->ssid_len);
122 *pos++ = WLAN_EID_SSID;
123 *pos++ = ifibss->ssid_len;
124 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
126 rates = sband->n_bitrates;
129 pos = skb_put(skb, 2 + rates);
130 *pos++ = WLAN_EID_SUPP_RATES;
132 memcpy(pos, supp_rates, rates);
134 if (sband->band == IEEE80211_BAND_2GHZ) {
135 pos = skb_put(skb, 2 + 1);
136 *pos++ = WLAN_EID_DS_PARAMS;
138 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
141 pos = skb_put(skb, 2 + 2);
142 *pos++ = WLAN_EID_IBSS_PARAMS;
144 /* FIX: set ATIM window based on scan results */
148 if (sband->n_bitrates > 8) {
149 rates = sband->n_bitrates - 8;
150 pos = skb_put(skb, 2 + rates);
151 *pos++ = WLAN_EID_EXT_SUPP_RATES;
153 memcpy(pos, &supp_rates[8], rates);
157 memcpy(skb_put(skb, ifibss->ie_len),
158 ifibss->ie, ifibss->ie_len);
160 /* add HT capability and information IEs */
161 if (channel_type && sband->ht_cap.ht_supported) {
162 pos = skb_put(skb, 4 +
163 sizeof(struct ieee80211_ht_cap) +
164 sizeof(struct ieee80211_ht_info));
165 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
167 pos = ieee80211_ie_build_ht_info(pos,
173 if (local->hw.queues >= 4) {
174 pos = skb_put(skb, 9);
175 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
176 *pos++ = 7; /* len */
177 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
180 *pos++ = 2; /* WME */
181 *pos++ = 0; /* WME info */
182 *pos++ = 1; /* WME ver */
183 *pos++ = 0; /* U-APSD no in use */
186 rcu_assign_pointer(ifibss->presp, skb);
188 sdata->vif.bss_conf.beacon_int = beacon_int;
189 sdata->vif.bss_conf.basic_rates = basic_rates;
190 bss_change = BSS_CHANGED_BEACON_INT;
191 bss_change |= ieee80211_reset_erp_info(sdata);
192 bss_change |= BSS_CHANGED_BSSID;
193 bss_change |= BSS_CHANGED_BEACON;
194 bss_change |= BSS_CHANGED_BEACON_ENABLED;
195 bss_change |= BSS_CHANGED_BASIC_RATES;
196 bss_change |= BSS_CHANGED_HT;
197 bss_change |= BSS_CHANGED_IBSS;
198 sdata->vif.bss_conf.ibss_joined = true;
199 ieee80211_bss_info_change_notify(sdata, bss_change);
201 ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates);
203 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
204 mod_timer(&ifibss->timer,
205 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
207 bss = cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel,
208 mgmt, skb->len, 0, GFP_KERNEL);
209 cfg80211_put_bss(bss);
210 netif_carrier_on(sdata->dev);
211 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
214 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
215 struct ieee80211_bss *bss)
217 struct cfg80211_bss *cbss =
218 container_of((void *)bss, struct cfg80211_bss, priv);
219 struct ieee80211_supported_band *sband;
222 u16 beacon_int = cbss->beacon_interval;
224 lockdep_assert_held(&sdata->u.ibss.mtx);
229 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
233 for (i = 0; i < bss->supp_rates_len; i++) {
234 int rate = (bss->supp_rates[i] & 0x7f) * 5;
235 bool is_basic = !!(bss->supp_rates[i] & 0x80);
237 for (j = 0; j < sband->n_bitrates; j++) {
238 if (sband->bitrates[j].bitrate == rate) {
240 basic_rates |= BIT(j);
246 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
254 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta,
258 struct ieee80211_sub_if_data *sdata = sta->sdata;
261 memcpy(addr, sta->sta.addr, ETH_ALEN);
263 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
264 wiphy_debug(sdata->local->hw.wiphy,
265 "Adding new IBSS station %pM (dev=%s)\n",
269 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
270 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
271 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
273 rate_control_rate_init(sta);
275 /* If it fails, maybe we raced another insertion? */
276 if (sta_info_insert_rcu(sta))
277 return sta_info_get(sdata, addr);
279 #ifdef CONFIG_MAC80211_IBSS_DEBUG
280 printk(KERN_DEBUG "TX Auth SA=%pM DA=%pM BSSID=%pM"
281 "(auth_transaction=1)\n", sdata->vif.addr,
282 sdata->u.ibss.bssid, addr);
284 ieee80211_send_auth(sdata, 1, WLAN_AUTH_OPEN, NULL, 0,
285 addr, sdata->u.ibss.bssid, NULL, 0, 0);
290 static struct sta_info *
291 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
292 const u8 *bssid, const u8 *addr,
293 u32 supp_rates, bool auth)
296 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
297 struct ieee80211_local *local = sdata->local;
298 struct sta_info *sta;
299 int band = local->hw.conf.channel->band;
302 * XXX: Consider removing the least recently used entry and
303 * allow new one to be added.
305 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
307 printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n",
313 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
318 if (compare_ether_addr(bssid, sdata->u.ibss.bssid)) {
323 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
329 sta->last_rx = jiffies;
331 /* make sure mandatory rates are always added */
332 sta->sta.supp_rates[band] = supp_rates |
333 ieee80211_mandatory_rates(local, band);
335 return ieee80211_ibss_finish_sta(sta, auth);
338 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
339 struct ieee80211_mgmt *mgmt,
342 u16 auth_alg, auth_transaction;
344 lockdep_assert_held(&sdata->u.ibss.mtx);
349 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
350 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
352 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
354 #ifdef CONFIG_MAC80211_IBSS_DEBUG
355 printk(KERN_DEBUG "%s: RX Auth SA=%pM DA=%pM BSSID=%pM."
356 "(auth_transaction=%d)\n",
357 sdata->name, mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
359 sta_info_destroy_addr(sdata, mgmt->sa);
360 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 0, false);
364 * IEEE 802.11 standard does not require authentication in IBSS
365 * networks and most implementations do not seem to use it.
366 * However, try to reply to authentication attempts if someone
367 * has actually implemented this.
369 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, NULL, 0,
370 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0);
373 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
374 struct ieee80211_mgmt *mgmt,
376 struct ieee80211_rx_status *rx_status,
377 struct ieee802_11_elems *elems,
380 struct ieee80211_local *local = sdata->local;
382 struct cfg80211_bss *cbss;
383 struct ieee80211_bss *bss;
384 struct sta_info *sta;
385 struct ieee80211_channel *channel;
386 u64 beacon_timestamp, rx_timestamp;
388 enum ieee80211_band band = rx_status->band;
389 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
390 bool rates_updated = false;
392 if (elems->ds_params && elems->ds_params_len == 1)
393 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
396 freq = rx_status->freq;
398 channel = ieee80211_get_channel(local->hw.wiphy, freq);
400 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
403 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
404 memcmp(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) {
407 sta = sta_info_get(sdata, mgmt->sa);
409 if (elems->supp_rates) {
410 supp_rates = ieee80211_sta_get_rates(local, elems,
415 prev_rates = sta->sta.supp_rates[band];
416 /* make sure mandatory rates are always added */
417 sta->sta.supp_rates[band] = supp_rates |
418 ieee80211_mandatory_rates(local, band);
420 if (sta->sta.supp_rates[band] != prev_rates) {
421 #ifdef CONFIG_MAC80211_IBSS_DEBUG
423 "%s: updated supp_rates set "
424 "for %pM based on beacon"
425 "/probe_resp (0x%x -> 0x%x)\n",
426 sdata->name, sta->sta.addr,
428 sta->sta.supp_rates[band]);
430 rates_updated = true;
434 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
435 mgmt->sa, supp_rates, true);
439 if (sta && elems->wmm_info)
440 set_sta_flag(sta, WLAN_STA_WME);
442 if (sta && elems->ht_info_elem && elems->ht_cap_elem &&
443 sdata->u.ibss.channel_type != NL80211_CHAN_NO_HT) {
445 struct ieee80211_sta_ht_cap sta_ht_cap_new;
446 enum nl80211_channel_type channel_type =
447 ieee80211_ht_info_to_channel_type(
448 elems->ht_info_elem);
450 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
455 * fall back to HT20 if we don't use or use
456 * the other extension channel
458 if ((channel_type == NL80211_CHAN_HT40MINUS ||
459 channel_type == NL80211_CHAN_HT40PLUS) &&
460 channel_type != sdata->u.ibss.channel_type)
461 sta_ht_cap_new.cap &=
462 ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
464 if (memcmp(&sta->sta.ht_cap, &sta_ht_cap_new,
465 sizeof(sta_ht_cap_new))) {
466 memcpy(&sta->sta.ht_cap, &sta_ht_cap_new,
467 sizeof(sta_ht_cap_new));
468 rates_updated = true;
472 if (sta && rates_updated)
473 rate_control_rate_init(sta);
478 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
483 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
485 /* was just updated in ieee80211_bss_info_update */
486 beacon_timestamp = cbss->tsf;
488 /* check if we need to merge IBSS */
490 /* we use a fixed BSSID */
491 if (sdata->u.ibss.fixed_bssid)
495 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
498 /* different channel */
499 if (cbss->channel != local->oper_channel)
503 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
504 memcmp(elems->ssid, sdata->u.ibss.ssid,
505 sdata->u.ibss.ssid_len))
509 if (memcmp(cbss->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0)
512 if (rx_status->flag & RX_FLAG_MACTIME_MPDU) {
514 * For correct IBSS merging we need mactime; since mactime is
515 * defined as the time the first data symbol of the frame hits
516 * the PHY, and the timestamp of the beacon is defined as "the
517 * time that the data symbol containing the first bit of the
518 * timestamp is transmitted to the PHY plus the transmitting
519 * STA's delays through its local PHY from the MAC-PHY
520 * interface to its interface with the WM" (802.11 11.1.2)
521 * - equals the time this bit arrives at the receiver - we have
522 * to take into account the offset between the two.
524 * E.g. at 1 MBit that means mactime is 192 usec earlier
525 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
529 if (rx_status->flag & RX_FLAG_HT)
530 rate = 65; /* TODO: HT rates */
532 rate = local->hw.wiphy->bands[band]->
533 bitrates[rx_status->rate_idx].bitrate;
535 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
538 * second best option: get current TSF
539 * (will return -1 if not supported)
541 rx_timestamp = drv_get_tsf(local, sdata);
544 #ifdef CONFIG_MAC80211_IBSS_DEBUG
545 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
546 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
547 mgmt->sa, mgmt->bssid,
548 (unsigned long long)rx_timestamp,
549 (unsigned long long)beacon_timestamp,
550 (unsigned long long)(rx_timestamp - beacon_timestamp),
554 if (beacon_timestamp > rx_timestamp) {
555 #ifdef CONFIG_MAC80211_IBSS_DEBUG
556 printk(KERN_DEBUG "%s: beacon TSF higher than "
557 "local TSF - IBSS merge with BSSID %pM\n",
558 sdata->name, mgmt->bssid);
560 ieee80211_sta_join_ibss(sdata, bss);
561 supp_rates = ieee80211_sta_get_rates(local, elems, band);
562 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
568 ieee80211_rx_bss_put(local, bss);
571 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
572 const u8 *bssid, const u8 *addr,
575 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
576 struct ieee80211_local *local = sdata->local;
577 struct sta_info *sta;
578 int band = local->hw.conf.channel->band;
581 * XXX: Consider removing the least recently used entry and
582 * allow new one to be added.
584 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
586 printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n",
591 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
594 if (compare_ether_addr(bssid, sdata->u.ibss.bssid))
597 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
601 sta->last_rx = jiffies;
603 /* make sure mandatory rates are always added */
604 sta->sta.supp_rates[band] = supp_rates |
605 ieee80211_mandatory_rates(local, band);
607 spin_lock(&ifibss->incomplete_lock);
608 list_add(&sta->list, &ifibss->incomplete_stations);
609 spin_unlock(&ifibss->incomplete_lock);
610 ieee80211_queue_work(&local->hw, &sdata->work);
613 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
615 struct ieee80211_local *local = sdata->local;
617 struct sta_info *sta;
619 lockdep_assert_held(&sdata->u.ibss.mtx);
623 list_for_each_entry_rcu(sta, &local->sta_list, list) {
624 if (sta->sdata == sdata &&
625 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
638 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
641 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
643 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
645 lockdep_assert_held(&ifibss->mtx);
647 mod_timer(&ifibss->timer,
648 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
650 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
652 if (time_before(jiffies, ifibss->last_scan_completed +
653 IEEE80211_IBSS_MERGE_INTERVAL))
656 if (ieee80211_sta_active_ibss(sdata))
659 if (ifibss->fixed_channel)
662 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
663 "IBSS networks with same SSID (merge)\n", sdata->name);
665 ieee80211_request_internal_scan(sdata,
666 ifibss->ssid, ifibss->ssid_len, NULL);
669 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
671 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
676 lockdep_assert_held(&ifibss->mtx);
678 if (ifibss->fixed_bssid) {
679 memcpy(bssid, ifibss->bssid, ETH_ALEN);
681 /* Generate random, not broadcast, locally administered BSSID. Mix in
682 * own MAC address to make sure that devices that do not have proper
683 * random number generator get different BSSID. */
684 get_random_bytes(bssid, ETH_ALEN);
685 for (i = 0; i < ETH_ALEN; i++)
686 bssid[i] ^= sdata->vif.addr[i];
691 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
694 capability = WLAN_CAPABILITY_IBSS;
697 capability |= WLAN_CAPABILITY_PRIVACY;
699 sdata->drop_unencrypted = 0;
701 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
702 ifibss->channel, ifibss->basic_rates,
707 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
710 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
712 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
713 struct ieee80211_local *local = sdata->local;
714 struct cfg80211_bss *cbss;
715 struct ieee80211_channel *chan = NULL;
716 const u8 *bssid = NULL;
720 lockdep_assert_held(&ifibss->mtx);
722 active_ibss = ieee80211_sta_active_ibss(sdata);
723 #ifdef CONFIG_MAC80211_IBSS_DEBUG
724 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
725 sdata->name, active_ibss);
726 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
731 capability = WLAN_CAPABILITY_IBSS;
733 capability |= WLAN_CAPABILITY_PRIVACY;
734 if (ifibss->fixed_bssid)
735 bssid = ifibss->bssid;
736 if (ifibss->fixed_channel)
737 chan = ifibss->channel;
738 if (!is_zero_ether_addr(ifibss->bssid))
739 bssid = ifibss->bssid;
740 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
741 ifibss->ssid, ifibss->ssid_len,
742 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
746 struct ieee80211_bss *bss;
748 bss = (void *)cbss->priv;
749 #ifdef CONFIG_MAC80211_IBSS_DEBUG
750 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
751 "%pM\n", cbss->bssid, ifibss->bssid);
752 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
754 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
755 " based on configured SSID\n",
756 sdata->name, cbss->bssid);
758 ieee80211_sta_join_ibss(sdata, bss);
759 ieee80211_rx_bss_put(local, bss);
763 #ifdef CONFIG_MAC80211_IBSS_DEBUG
764 printk(KERN_DEBUG " did not try to join ibss\n");
765 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
767 /* Selected IBSS not found in current scan results - try to scan */
768 if (time_after(jiffies, ifibss->last_scan_completed +
769 IEEE80211_SCAN_INTERVAL)) {
770 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
771 "join\n", sdata->name);
773 ieee80211_request_internal_scan(sdata,
774 ifibss->ssid, ifibss->ssid_len,
775 ifibss->fixed_channel ? ifibss->channel : NULL);
777 int interval = IEEE80211_SCAN_INTERVAL;
779 if (time_after(jiffies, ifibss->ibss_join_req +
780 IEEE80211_IBSS_JOIN_TIMEOUT)) {
781 if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) {
782 ieee80211_sta_create_ibss(sdata);
785 printk(KERN_DEBUG "%s: IBSS not allowed on"
786 " %d MHz\n", sdata->name,
787 local->hw.conf.channel->center_freq);
789 /* No IBSS found - decrease scan interval and continue
791 interval = IEEE80211_SCAN_INTERVAL_SLOW;
794 mod_timer(&ifibss->timer,
795 round_jiffies(jiffies + interval));
799 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
802 struct ieee80211_mgmt *mgmt = (void *)req->data;
803 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
804 struct ieee80211_local *local = sdata->local;
805 int tx_last_beacon, len = req->len;
807 struct ieee80211_mgmt *resp;
808 struct sk_buff *presp;
811 lockdep_assert_held(&ifibss->mtx);
813 presp = rcu_dereference_protected(ifibss->presp,
814 lockdep_is_held(&ifibss->mtx));
816 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
817 len < 24 + 2 || !presp)
820 tx_last_beacon = drv_tx_last_beacon(local);
822 #ifdef CONFIG_MAC80211_IBSS_DEBUG
823 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
824 " (tx_last_beacon=%d)\n",
825 sdata->name, mgmt->sa, mgmt->da,
826 mgmt->bssid, tx_last_beacon);
827 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
829 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
832 if (memcmp(mgmt->bssid, ifibss->bssid, ETH_ALEN) != 0 &&
833 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
836 end = ((u8 *) mgmt) + len;
837 pos = mgmt->u.probe_req.variable;
838 if (pos[0] != WLAN_EID_SSID ||
839 pos + 2 + pos[1] > end) {
840 #ifdef CONFIG_MAC80211_IBSS_DEBUG
841 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
843 sdata->name, mgmt->sa);
848 (pos[1] != ifibss->ssid_len ||
849 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
850 /* Ignore ProbeReq for foreign SSID */
854 /* Reply with ProbeResp */
855 skb = skb_copy(presp, GFP_KERNEL);
859 resp = (struct ieee80211_mgmt *) skb->data;
860 memcpy(resp->da, mgmt->sa, ETH_ALEN);
861 #ifdef CONFIG_MAC80211_IBSS_DEBUG
862 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
863 sdata->name, resp->da);
864 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
865 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
866 ieee80211_tx_skb(sdata, skb);
869 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
870 struct ieee80211_mgmt *mgmt,
872 struct ieee80211_rx_status *rx_status)
875 struct ieee802_11_elems elems;
877 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
881 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
884 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
887 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
888 struct ieee80211_mgmt *mgmt,
890 struct ieee80211_rx_status *rx_status)
893 struct ieee802_11_elems elems;
895 /* Process beacon from the current BSS */
896 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
900 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
902 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
905 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
908 struct ieee80211_rx_status *rx_status;
909 struct ieee80211_mgmt *mgmt;
912 rx_status = IEEE80211_SKB_RXCB(skb);
913 mgmt = (struct ieee80211_mgmt *) skb->data;
914 fc = le16_to_cpu(mgmt->frame_control);
916 mutex_lock(&sdata->u.ibss.mtx);
918 if (!sdata->u.ibss.ssid_len)
919 goto mgmt_out; /* not ready to merge yet */
921 switch (fc & IEEE80211_FCTL_STYPE) {
922 case IEEE80211_STYPE_PROBE_REQ:
923 ieee80211_rx_mgmt_probe_req(sdata, skb);
925 case IEEE80211_STYPE_PROBE_RESP:
926 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
929 case IEEE80211_STYPE_BEACON:
930 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
933 case IEEE80211_STYPE_AUTH:
934 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
939 mutex_unlock(&sdata->u.ibss.mtx);
942 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
944 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
945 struct sta_info *sta;
947 mutex_lock(&ifibss->mtx);
950 * Work could be scheduled after scan or similar
951 * when we aren't even joined (or trying) with a
954 if (!ifibss->ssid_len)
957 spin_lock_bh(&ifibss->incomplete_lock);
958 while (!list_empty(&ifibss->incomplete_stations)) {
959 sta = list_first_entry(&ifibss->incomplete_stations,
960 struct sta_info, list);
961 list_del(&sta->list);
962 spin_unlock_bh(&ifibss->incomplete_lock);
964 ieee80211_ibss_finish_sta(sta, true);
966 spin_lock_bh(&ifibss->incomplete_lock);
968 spin_unlock_bh(&ifibss->incomplete_lock);
970 switch (ifibss->state) {
971 case IEEE80211_IBSS_MLME_SEARCH:
972 ieee80211_sta_find_ibss(sdata);
974 case IEEE80211_IBSS_MLME_JOINED:
975 ieee80211_sta_merge_ibss(sdata);
983 mutex_unlock(&ifibss->mtx);
986 static void ieee80211_ibss_timer(unsigned long data)
988 struct ieee80211_sub_if_data *sdata =
989 (struct ieee80211_sub_if_data *) data;
990 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
991 struct ieee80211_local *local = sdata->local;
993 if (local->quiescing) {
994 ifibss->timer_running = true;
998 ieee80211_queue_work(&local->hw, &sdata->work);
1002 void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata)
1004 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1006 if (del_timer_sync(&ifibss->timer))
1007 ifibss->timer_running = true;
1010 void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata)
1012 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1014 if (ifibss->timer_running) {
1015 add_timer(&ifibss->timer);
1016 ifibss->timer_running = false;
1021 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1023 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1025 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1026 (unsigned long) sdata);
1027 mutex_init(&ifibss->mtx);
1028 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1029 spin_lock_init(&ifibss->incomplete_lock);
1032 /* scan finished notification */
1033 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1035 struct ieee80211_sub_if_data *sdata;
1037 mutex_lock(&local->iflist_mtx);
1038 list_for_each_entry(sdata, &local->interfaces, list) {
1039 if (!ieee80211_sdata_running(sdata))
1041 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1043 sdata->u.ibss.last_scan_completed = jiffies;
1044 ieee80211_queue_work(&local->hw, &sdata->work);
1046 mutex_unlock(&local->iflist_mtx);
1049 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1050 struct cfg80211_ibss_params *params)
1052 struct sk_buff *skb;
1055 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom +
1056 sizeof(struct ieee80211_hdr_3addr) +
1057 12 /* struct ieee80211_mgmt.u.beacon */ +
1058 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
1059 2 + 8 /* max Supported Rates */ +
1060 3 /* max DS params */ +
1061 4 /* IBSS params */ +
1062 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
1063 2 + sizeof(struct ieee80211_ht_cap) +
1064 2 + sizeof(struct ieee80211_ht_info) +
1069 mutex_lock(&sdata->u.ibss.mtx);
1071 if (params->bssid) {
1072 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1073 sdata->u.ibss.fixed_bssid = true;
1075 sdata->u.ibss.fixed_bssid = false;
1077 sdata->u.ibss.privacy = params->privacy;
1078 sdata->u.ibss.basic_rates = params->basic_rates;
1079 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1080 sizeof(params->mcast_rate));
1082 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1084 sdata->u.ibss.channel = params->channel;
1085 sdata->u.ibss.channel_type = params->channel_type;
1086 sdata->u.ibss.fixed_channel = params->channel_fixed;
1088 /* fix ourselves to that channel now already */
1089 if (params->channel_fixed) {
1090 sdata->local->oper_channel = params->channel;
1091 if (!ieee80211_set_channel_type(sdata->local, sdata,
1092 params->channel_type)) {
1093 mutex_unlock(&sdata->u.ibss.mtx);
1100 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1102 if (sdata->u.ibss.ie)
1103 sdata->u.ibss.ie_len = params->ie_len;
1106 sdata->u.ibss.skb = skb;
1107 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1108 sdata->u.ibss.ibss_join_req = jiffies;
1110 memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN);
1111 sdata->u.ibss.ssid_len = params->ssid_len;
1113 mutex_unlock(&sdata->u.ibss.mtx);
1115 mutex_lock(&sdata->local->mtx);
1116 ieee80211_recalc_idle(sdata->local);
1117 mutex_unlock(&sdata->local->mtx);
1120 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1121 * reserved, but an HT STA shall protect HT transmissions as though
1122 * the HT Protection field were set to non-HT mixed mode.
1124 * In an IBSS, the RIFS Mode field of the HT Operation element is
1125 * also reserved, but an HT STA shall operate as though this field
1129 sdata->vif.bss_conf.ht_operation_mode |=
1130 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1131 | IEEE80211_HT_PARAM_RIFS_MODE;
1133 changed |= BSS_CHANGED_HT;
1134 ieee80211_bss_info_change_notify(sdata, changed);
1136 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1141 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1143 struct sk_buff *skb;
1144 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1145 struct ieee80211_local *local = sdata->local;
1146 struct cfg80211_bss *cbss;
1149 struct sta_info *sta;
1151 mutex_lock(&sdata->u.ibss.mtx);
1153 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1154 memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
1155 sdata->u.ibss.ssid_len = 0;
1157 active_ibss = ieee80211_sta_active_ibss(sdata);
1159 if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) {
1160 capability = WLAN_CAPABILITY_IBSS;
1162 if (ifibss->privacy)
1163 capability |= WLAN_CAPABILITY_PRIVACY;
1165 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->channel,
1166 ifibss->bssid, ifibss->ssid,
1167 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
1168 WLAN_CAPABILITY_PRIVACY,
1172 cfg80211_unlink_bss(local->hw.wiphy, cbss);
1173 cfg80211_put_bss(cbss);
1177 sta_info_flush(sdata->local, sdata);
1179 spin_lock_bh(&ifibss->incomplete_lock);
1180 while (!list_empty(&ifibss->incomplete_stations)) {
1181 sta = list_first_entry(&ifibss->incomplete_stations,
1182 struct sta_info, list);
1183 list_del(&sta->list);
1184 spin_unlock_bh(&ifibss->incomplete_lock);
1186 sta_info_free(local, sta);
1187 spin_lock_bh(&ifibss->incomplete_lock);
1189 spin_unlock_bh(&ifibss->incomplete_lock);
1191 netif_carrier_off(sdata->dev);
1194 kfree(sdata->u.ibss.ie);
1195 skb = rcu_dereference_protected(sdata->u.ibss.presp,
1196 lockdep_is_held(&sdata->u.ibss.mtx));
1197 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
1198 sdata->vif.bss_conf.ibss_joined = false;
1199 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
1204 skb_queue_purge(&sdata->skb_queue);
1206 del_timer_sync(&sdata->u.ibss.timer);
1208 mutex_unlock(&sdata->u.ibss.mtx);
1210 mutex_lock(&local->mtx);
1211 ieee80211_recalc_idle(sdata->local);
1212 mutex_unlock(&local->mtx);