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_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
40 struct ieee80211_mgmt *mgmt,
43 u16 auth_alg, auth_transaction;
45 lockdep_assert_held(&sdata->u.ibss.mtx);
50 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
51 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
54 * IEEE 802.11 standard does not require authentication in IBSS
55 * networks and most implementations do not seem to use it.
56 * However, try to reply to authentication attempts if someone
57 * has actually implemented this.
59 if (auth_alg == WLAN_AUTH_OPEN && auth_transaction == 1)
60 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, NULL, 0,
61 sdata->u.ibss.bssid, NULL, 0, 0);
64 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
65 const u8 *bssid, const int beacon_int,
66 struct ieee80211_channel *chan,
67 const u32 basic_rates,
68 const u16 capability, u64 tsf)
70 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
71 struct ieee80211_local *local = sdata->local;
74 struct ieee80211_mgmt *mgmt;
76 struct ieee80211_supported_band *sband;
77 struct cfg80211_bss *bss;
79 u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
80 enum nl80211_channel_type channel_type;
82 lockdep_assert_held(&ifibss->mtx);
84 /* Reset own TSF to allow time synchronization work. */
85 drv_reset_tsf(local, sdata);
88 RCU_INIT_POINTER(ifibss->presp, NULL);
90 skb->data = skb->head;
92 skb_reset_tail_pointer(skb);
93 skb_reserve(skb, sdata->local->hw.extra_tx_headroom);
95 if (memcmp(ifibss->bssid, bssid, ETH_ALEN))
96 sta_info_flush(sdata->local, sdata);
98 /* if merging, indicate to driver that we leave the old IBSS */
99 if (sdata->vif.bss_conf.ibss_joined) {
100 sdata->vif.bss_conf.ibss_joined = false;
101 netif_carrier_off(sdata->dev);
102 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IBSS);
105 memcpy(ifibss->bssid, bssid, ETH_ALEN);
107 sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
109 channel_type = ifibss->channel_type;
110 if (channel_type > NL80211_CHAN_HT20 &&
111 !cfg80211_can_beacon_sec_chan(local->hw.wiphy, chan, channel_type))
112 channel_type = NL80211_CHAN_HT20;
113 if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
114 /* can only fail due to HT40+/- mismatch */
115 channel_type = NL80211_CHAN_HT20;
116 WARN_ON(!ieee80211_set_channel_type(local, sdata,
119 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
121 sband = local->hw.wiphy->bands[chan->band];
123 /* build supported rates array */
125 for (i = 0; i < sband->n_bitrates; i++) {
126 int rate = sband->bitrates[i].bitrate;
128 if (basic_rates & BIT(i))
130 *pos++ = basic | (u8) (rate / 5);
133 /* Build IBSS probe response */
134 mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon));
135 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
136 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
137 IEEE80211_STYPE_PROBE_RESP);
138 memset(mgmt->da, 0xff, ETH_ALEN);
139 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
140 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
141 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
142 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
143 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
145 pos = skb_put(skb, 2 + ifibss->ssid_len);
146 *pos++ = WLAN_EID_SSID;
147 *pos++ = ifibss->ssid_len;
148 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
150 rates = sband->n_bitrates;
153 pos = skb_put(skb, 2 + rates);
154 *pos++ = WLAN_EID_SUPP_RATES;
156 memcpy(pos, supp_rates, rates);
158 if (sband->band == IEEE80211_BAND_2GHZ) {
159 pos = skb_put(skb, 2 + 1);
160 *pos++ = WLAN_EID_DS_PARAMS;
162 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
165 pos = skb_put(skb, 2 + 2);
166 *pos++ = WLAN_EID_IBSS_PARAMS;
168 /* FIX: set ATIM window based on scan results */
172 if (sband->n_bitrates > 8) {
173 rates = sband->n_bitrates - 8;
174 pos = skb_put(skb, 2 + rates);
175 *pos++ = WLAN_EID_EXT_SUPP_RATES;
177 memcpy(pos, &supp_rates[8], rates);
181 memcpy(skb_put(skb, ifibss->ie_len),
182 ifibss->ie, ifibss->ie_len);
184 /* add HT capability and information IEs */
185 if (channel_type && sband->ht_cap.ht_supported) {
186 pos = skb_put(skb, 4 +
187 sizeof(struct ieee80211_ht_cap) +
188 sizeof(struct ieee80211_ht_info));
189 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
191 pos = ieee80211_ie_build_ht_info(pos,
197 if (local->hw.queues >= 4) {
198 pos = skb_put(skb, 9);
199 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
200 *pos++ = 7; /* len */
201 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
204 *pos++ = 2; /* WME */
205 *pos++ = 0; /* WME info */
206 *pos++ = 1; /* WME ver */
207 *pos++ = 0; /* U-APSD no in use */
210 rcu_assign_pointer(ifibss->presp, skb);
212 sdata->vif.bss_conf.beacon_int = beacon_int;
213 sdata->vif.bss_conf.basic_rates = basic_rates;
214 bss_change = BSS_CHANGED_BEACON_INT;
215 bss_change |= ieee80211_reset_erp_info(sdata);
216 bss_change |= BSS_CHANGED_BSSID;
217 bss_change |= BSS_CHANGED_BEACON;
218 bss_change |= BSS_CHANGED_BEACON_ENABLED;
219 bss_change |= BSS_CHANGED_BASIC_RATES;
220 bss_change |= BSS_CHANGED_HT;
221 bss_change |= BSS_CHANGED_IBSS;
222 sdata->vif.bss_conf.ibss_joined = true;
223 ieee80211_bss_info_change_notify(sdata, bss_change);
225 ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates);
227 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
228 mod_timer(&ifibss->timer,
229 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
231 bss = cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel,
232 mgmt, skb->len, 0, GFP_KERNEL);
233 cfg80211_put_bss(bss);
234 netif_carrier_on(sdata->dev);
235 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
238 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
239 struct ieee80211_bss *bss)
241 struct cfg80211_bss *cbss =
242 container_of((void *)bss, struct cfg80211_bss, priv);
243 struct ieee80211_supported_band *sband;
246 u16 beacon_int = cbss->beacon_interval;
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);
270 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
278 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
281 struct ieee80211_sub_if_data *sdata = sta->sdata;
284 memcpy(addr, sta->sta.addr, ETH_ALEN);
286 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
287 wiphy_debug(sdata->local->hw.wiphy,
288 "Adding new IBSS station %pM (dev=%s)\n",
292 sta_info_move_state(sta, IEEE80211_STA_AUTH);
293 sta_info_move_state(sta, IEEE80211_STA_ASSOC);
294 sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
296 rate_control_rate_init(sta);
298 /* If it fails, maybe we raced another insertion? */
299 if (sta_info_insert_rcu(sta))
300 return sta_info_get(sdata, addr);
304 static struct sta_info *
305 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
306 const u8 *bssid, const u8 *addr,
310 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
311 struct ieee80211_local *local = sdata->local;
312 struct sta_info *sta;
313 int band = local->hw.conf.channel->band;
316 * XXX: Consider removing the least recently used entry and
317 * allow new one to be added.
319 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
321 printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n",
327 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
332 if (compare_ether_addr(bssid, sdata->u.ibss.bssid)) {
337 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
343 sta->last_rx = jiffies;
345 /* make sure mandatory rates are always added */
346 sta->sta.supp_rates[band] = supp_rates |
347 ieee80211_mandatory_rates(local, band);
349 return ieee80211_ibss_finish_sta(sta);
352 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
353 struct ieee80211_mgmt *mgmt,
355 struct ieee80211_rx_status *rx_status,
356 struct ieee802_11_elems *elems,
359 struct ieee80211_local *local = sdata->local;
361 struct cfg80211_bss *cbss;
362 struct ieee80211_bss *bss;
363 struct sta_info *sta;
364 struct ieee80211_channel *channel;
365 u64 beacon_timestamp, rx_timestamp;
367 enum ieee80211_band band = rx_status->band;
368 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
369 bool rates_updated = false;
371 if (elems->ds_params && elems->ds_params_len == 1)
372 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
375 freq = rx_status->freq;
377 channel = ieee80211_get_channel(local->hw.wiphy, freq);
379 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
382 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
383 memcmp(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) {
386 sta = sta_info_get(sdata, mgmt->sa);
388 if (elems->supp_rates) {
389 supp_rates = ieee80211_sta_get_rates(local, elems,
394 prev_rates = sta->sta.supp_rates[band];
395 /* make sure mandatory rates are always added */
396 sta->sta.supp_rates[band] = supp_rates |
397 ieee80211_mandatory_rates(local, band);
399 if (sta->sta.supp_rates[band] != prev_rates) {
400 #ifdef CONFIG_MAC80211_IBSS_DEBUG
402 "%s: updated supp_rates set "
403 "for %pM based on beacon"
404 "/probe_resp (0x%x -> 0x%x)\n",
405 sdata->name, sta->sta.addr,
407 sta->sta.supp_rates[band]);
409 rates_updated = true;
413 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
414 mgmt->sa, supp_rates);
418 if (sta && elems->wmm_info)
419 set_sta_flag(sta, WLAN_STA_WME);
421 if (sta && elems->ht_info_elem && elems->ht_cap_elem &&
422 sdata->u.ibss.channel_type != NL80211_CHAN_NO_HT) {
424 struct ieee80211_sta_ht_cap sta_ht_cap_new;
425 enum nl80211_channel_type channel_type =
426 ieee80211_ht_info_to_channel_type(
427 elems->ht_info_elem);
429 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
434 * fall back to HT20 if we don't use or use
435 * the other extension channel
437 if ((channel_type == NL80211_CHAN_HT40MINUS ||
438 channel_type == NL80211_CHAN_HT40PLUS) &&
439 channel_type != sdata->u.ibss.channel_type)
440 sta_ht_cap_new.cap &=
441 ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
443 if (memcmp(&sta->sta.ht_cap, &sta_ht_cap_new,
444 sizeof(sta_ht_cap_new))) {
445 memcpy(&sta->sta.ht_cap, &sta_ht_cap_new,
446 sizeof(sta_ht_cap_new));
447 rates_updated = true;
451 if (sta && rates_updated)
452 rate_control_rate_init(sta);
457 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
462 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
464 /* was just updated in ieee80211_bss_info_update */
465 beacon_timestamp = cbss->tsf;
467 /* check if we need to merge IBSS */
469 /* we use a fixed BSSID */
470 if (sdata->u.ibss.fixed_bssid)
474 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
477 /* different channel */
478 if (cbss->channel != local->oper_channel)
482 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
483 memcmp(elems->ssid, sdata->u.ibss.ssid,
484 sdata->u.ibss.ssid_len))
488 if (memcmp(cbss->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0)
491 if (rx_status->flag & RX_FLAG_MACTIME_MPDU) {
493 * For correct IBSS merging we need mactime; since mactime is
494 * defined as the time the first data symbol of the frame hits
495 * the PHY, and the timestamp of the beacon is defined as "the
496 * time that the data symbol containing the first bit of the
497 * timestamp is transmitted to the PHY plus the transmitting
498 * STA's delays through its local PHY from the MAC-PHY
499 * interface to its interface with the WM" (802.11 11.1.2)
500 * - equals the time this bit arrives at the receiver - we have
501 * to take into account the offset between the two.
503 * E.g. at 1 MBit that means mactime is 192 usec earlier
504 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
508 if (rx_status->flag & RX_FLAG_HT)
509 rate = 65; /* TODO: HT rates */
511 rate = local->hw.wiphy->bands[band]->
512 bitrates[rx_status->rate_idx].bitrate;
514 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
517 * second best option: get current TSF
518 * (will return -1 if not supported)
520 rx_timestamp = drv_get_tsf(local, sdata);
523 #ifdef CONFIG_MAC80211_IBSS_DEBUG
524 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
525 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
526 mgmt->sa, mgmt->bssid,
527 (unsigned long long)rx_timestamp,
528 (unsigned long long)beacon_timestamp,
529 (unsigned long long)(rx_timestamp - beacon_timestamp),
533 if (beacon_timestamp > rx_timestamp) {
534 #ifdef CONFIG_MAC80211_IBSS_DEBUG
535 printk(KERN_DEBUG "%s: beacon TSF higher than "
536 "local TSF - IBSS merge with BSSID %pM\n",
537 sdata->name, mgmt->bssid);
539 ieee80211_sta_join_ibss(sdata, bss);
540 supp_rates = ieee80211_sta_get_rates(local, elems, band);
541 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
547 ieee80211_rx_bss_put(local, bss);
550 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
551 const u8 *bssid, const u8 *addr,
554 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
555 struct ieee80211_local *local = sdata->local;
556 struct sta_info *sta;
557 int band = local->hw.conf.channel->band;
560 * XXX: Consider removing the least recently used entry and
561 * allow new one to be added.
563 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
565 printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n",
570 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
573 if (compare_ether_addr(bssid, sdata->u.ibss.bssid))
576 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
580 sta->last_rx = jiffies;
582 /* make sure mandatory rates are always added */
583 sta->sta.supp_rates[band] = supp_rates |
584 ieee80211_mandatory_rates(local, band);
586 spin_lock(&ifibss->incomplete_lock);
587 list_add(&sta->list, &ifibss->incomplete_stations);
588 spin_unlock(&ifibss->incomplete_lock);
589 ieee80211_queue_work(&local->hw, &sdata->work);
592 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
594 struct ieee80211_local *local = sdata->local;
596 struct sta_info *sta;
598 lockdep_assert_held(&sdata->u.ibss.mtx);
602 list_for_each_entry_rcu(sta, &local->sta_list, list) {
603 if (sta->sdata == sdata &&
604 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
617 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
620 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
622 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
624 lockdep_assert_held(&ifibss->mtx);
626 mod_timer(&ifibss->timer,
627 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
629 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
631 if (time_before(jiffies, ifibss->last_scan_completed +
632 IEEE80211_IBSS_MERGE_INTERVAL))
635 if (ieee80211_sta_active_ibss(sdata))
638 if (ifibss->fixed_channel)
641 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
642 "IBSS networks with same SSID (merge)\n", sdata->name);
644 ieee80211_request_internal_scan(sdata,
645 ifibss->ssid, ifibss->ssid_len, NULL);
648 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
650 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
655 lockdep_assert_held(&ifibss->mtx);
657 if (ifibss->fixed_bssid) {
658 memcpy(bssid, ifibss->bssid, ETH_ALEN);
660 /* Generate random, not broadcast, locally administered BSSID. Mix in
661 * own MAC address to make sure that devices that do not have proper
662 * random number generator get different BSSID. */
663 get_random_bytes(bssid, ETH_ALEN);
664 for (i = 0; i < ETH_ALEN; i++)
665 bssid[i] ^= sdata->vif.addr[i];
670 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
673 capability = WLAN_CAPABILITY_IBSS;
676 capability |= WLAN_CAPABILITY_PRIVACY;
678 sdata->drop_unencrypted = 0;
680 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
681 ifibss->channel, ifibss->basic_rates,
686 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
689 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
691 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
692 struct ieee80211_local *local = sdata->local;
693 struct cfg80211_bss *cbss;
694 struct ieee80211_channel *chan = NULL;
695 const u8 *bssid = NULL;
699 lockdep_assert_held(&ifibss->mtx);
701 active_ibss = ieee80211_sta_active_ibss(sdata);
702 #ifdef CONFIG_MAC80211_IBSS_DEBUG
703 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
704 sdata->name, active_ibss);
705 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
710 capability = WLAN_CAPABILITY_IBSS;
712 capability |= WLAN_CAPABILITY_PRIVACY;
713 if (ifibss->fixed_bssid)
714 bssid = ifibss->bssid;
715 if (ifibss->fixed_channel)
716 chan = ifibss->channel;
717 if (!is_zero_ether_addr(ifibss->bssid))
718 bssid = ifibss->bssid;
719 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
720 ifibss->ssid, ifibss->ssid_len,
721 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
725 struct ieee80211_bss *bss;
727 bss = (void *)cbss->priv;
728 #ifdef CONFIG_MAC80211_IBSS_DEBUG
729 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
730 "%pM\n", cbss->bssid, ifibss->bssid);
731 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
733 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
734 " based on configured SSID\n",
735 sdata->name, cbss->bssid);
737 ieee80211_sta_join_ibss(sdata, bss);
738 ieee80211_rx_bss_put(local, bss);
742 #ifdef CONFIG_MAC80211_IBSS_DEBUG
743 printk(KERN_DEBUG " did not try to join ibss\n");
744 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
746 /* Selected IBSS not found in current scan results - try to scan */
747 if (time_after(jiffies, ifibss->last_scan_completed +
748 IEEE80211_SCAN_INTERVAL)) {
749 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
750 "join\n", sdata->name);
752 ieee80211_request_internal_scan(sdata,
753 ifibss->ssid, ifibss->ssid_len,
754 ifibss->fixed_channel ? ifibss->channel : NULL);
756 int interval = IEEE80211_SCAN_INTERVAL;
758 if (time_after(jiffies, ifibss->ibss_join_req +
759 IEEE80211_IBSS_JOIN_TIMEOUT)) {
760 if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) {
761 ieee80211_sta_create_ibss(sdata);
764 printk(KERN_DEBUG "%s: IBSS not allowed on"
765 " %d MHz\n", sdata->name,
766 local->hw.conf.channel->center_freq);
768 /* No IBSS found - decrease scan interval and continue
770 interval = IEEE80211_SCAN_INTERVAL_SLOW;
773 mod_timer(&ifibss->timer,
774 round_jiffies(jiffies + interval));
778 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
781 struct ieee80211_mgmt *mgmt = (void *)req->data;
782 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
783 struct ieee80211_local *local = sdata->local;
784 int tx_last_beacon, len = req->len;
786 struct ieee80211_mgmt *resp;
787 struct sk_buff *presp;
790 lockdep_assert_held(&ifibss->mtx);
792 presp = rcu_dereference_protected(ifibss->presp,
793 lockdep_is_held(&ifibss->mtx));
795 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
796 len < 24 + 2 || !presp)
799 tx_last_beacon = drv_tx_last_beacon(local);
801 #ifdef CONFIG_MAC80211_IBSS_DEBUG
802 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
803 " (tx_last_beacon=%d)\n",
804 sdata->name, mgmt->sa, mgmt->da,
805 mgmt->bssid, tx_last_beacon);
806 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
808 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
811 if (memcmp(mgmt->bssid, ifibss->bssid, ETH_ALEN) != 0 &&
812 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
815 end = ((u8 *) mgmt) + len;
816 pos = mgmt->u.probe_req.variable;
817 if (pos[0] != WLAN_EID_SSID ||
818 pos + 2 + pos[1] > end) {
819 #ifdef CONFIG_MAC80211_IBSS_DEBUG
820 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
822 sdata->name, mgmt->sa);
827 (pos[1] != ifibss->ssid_len ||
828 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
829 /* Ignore ProbeReq for foreign SSID */
833 /* Reply with ProbeResp */
834 skb = skb_copy(presp, GFP_KERNEL);
838 resp = (struct ieee80211_mgmt *) skb->data;
839 memcpy(resp->da, mgmt->sa, ETH_ALEN);
840 #ifdef CONFIG_MAC80211_IBSS_DEBUG
841 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
842 sdata->name, resp->da);
843 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
844 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
845 ieee80211_tx_skb(sdata, skb);
848 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
849 struct ieee80211_mgmt *mgmt,
851 struct ieee80211_rx_status *rx_status)
854 struct ieee802_11_elems elems;
856 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
857 return; /* ignore ProbeResp to foreign address */
859 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
863 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
866 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
869 static void ieee80211_rx_mgmt_beacon(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 /* Process beacon from the current BSS */
878 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
882 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
884 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
887 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
890 struct ieee80211_rx_status *rx_status;
891 struct ieee80211_mgmt *mgmt;
894 rx_status = IEEE80211_SKB_RXCB(skb);
895 mgmt = (struct ieee80211_mgmt *) skb->data;
896 fc = le16_to_cpu(mgmt->frame_control);
898 mutex_lock(&sdata->u.ibss.mtx);
900 if (!sdata->u.ibss.ssid_len)
901 goto mgmt_out; /* not ready to merge yet */
903 switch (fc & IEEE80211_FCTL_STYPE) {
904 case IEEE80211_STYPE_PROBE_REQ:
905 ieee80211_rx_mgmt_probe_req(sdata, skb);
907 case IEEE80211_STYPE_PROBE_RESP:
908 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
911 case IEEE80211_STYPE_BEACON:
912 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
915 case IEEE80211_STYPE_AUTH:
916 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
921 mutex_unlock(&sdata->u.ibss.mtx);
924 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
926 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
927 struct sta_info *sta;
929 mutex_lock(&ifibss->mtx);
932 * Work could be scheduled after scan or similar
933 * when we aren't even joined (or trying) with a
936 if (!ifibss->ssid_len)
939 spin_lock_bh(&ifibss->incomplete_lock);
940 while (!list_empty(&ifibss->incomplete_stations)) {
941 sta = list_first_entry(&ifibss->incomplete_stations,
942 struct sta_info, list);
943 list_del(&sta->list);
944 spin_unlock_bh(&ifibss->incomplete_lock);
946 ieee80211_ibss_finish_sta(sta);
948 spin_lock_bh(&ifibss->incomplete_lock);
950 spin_unlock_bh(&ifibss->incomplete_lock);
952 switch (ifibss->state) {
953 case IEEE80211_IBSS_MLME_SEARCH:
954 ieee80211_sta_find_ibss(sdata);
956 case IEEE80211_IBSS_MLME_JOINED:
957 ieee80211_sta_merge_ibss(sdata);
965 mutex_unlock(&ifibss->mtx);
968 static void ieee80211_ibss_timer(unsigned long data)
970 struct ieee80211_sub_if_data *sdata =
971 (struct ieee80211_sub_if_data *) data;
972 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
973 struct ieee80211_local *local = sdata->local;
975 if (local->quiescing) {
976 ifibss->timer_running = true;
980 ieee80211_queue_work(&local->hw, &sdata->work);
984 void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata)
986 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
988 if (del_timer_sync(&ifibss->timer))
989 ifibss->timer_running = true;
992 void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata)
994 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
996 if (ifibss->timer_running) {
997 add_timer(&ifibss->timer);
998 ifibss->timer_running = false;
1003 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1005 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1007 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1008 (unsigned long) sdata);
1009 mutex_init(&ifibss->mtx);
1010 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1011 spin_lock_init(&ifibss->incomplete_lock);
1014 /* scan finished notification */
1015 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1017 struct ieee80211_sub_if_data *sdata;
1019 mutex_lock(&local->iflist_mtx);
1020 list_for_each_entry(sdata, &local->interfaces, list) {
1021 if (!ieee80211_sdata_running(sdata))
1023 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1025 sdata->u.ibss.last_scan_completed = jiffies;
1026 ieee80211_queue_work(&local->hw, &sdata->work);
1028 mutex_unlock(&local->iflist_mtx);
1031 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1032 struct cfg80211_ibss_params *params)
1034 struct sk_buff *skb;
1037 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom +
1038 sizeof(struct ieee80211_hdr_3addr) +
1039 12 /* struct ieee80211_mgmt.u.beacon */ +
1040 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
1041 2 + 8 /* max Supported Rates */ +
1042 3 /* max DS params */ +
1043 4 /* IBSS params */ +
1044 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
1045 2 + sizeof(struct ieee80211_ht_cap) +
1046 2 + sizeof(struct ieee80211_ht_info) +
1051 mutex_lock(&sdata->u.ibss.mtx);
1053 if (params->bssid) {
1054 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1055 sdata->u.ibss.fixed_bssid = true;
1057 sdata->u.ibss.fixed_bssid = false;
1059 sdata->u.ibss.privacy = params->privacy;
1060 sdata->u.ibss.basic_rates = params->basic_rates;
1061 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1062 sizeof(params->mcast_rate));
1064 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1066 sdata->u.ibss.channel = params->channel;
1067 sdata->u.ibss.channel_type = params->channel_type;
1068 sdata->u.ibss.fixed_channel = params->channel_fixed;
1070 /* fix ourselves to that channel now already */
1071 if (params->channel_fixed) {
1072 sdata->local->oper_channel = params->channel;
1073 if (!ieee80211_set_channel_type(sdata->local, sdata,
1074 params->channel_type)) {
1075 mutex_unlock(&sdata->u.ibss.mtx);
1082 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1084 if (sdata->u.ibss.ie)
1085 sdata->u.ibss.ie_len = params->ie_len;
1088 sdata->u.ibss.skb = skb;
1089 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1090 sdata->u.ibss.ibss_join_req = jiffies;
1092 memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN);
1093 sdata->u.ibss.ssid_len = params->ssid_len;
1095 mutex_unlock(&sdata->u.ibss.mtx);
1097 mutex_lock(&sdata->local->mtx);
1098 ieee80211_recalc_idle(sdata->local);
1099 mutex_unlock(&sdata->local->mtx);
1102 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1103 * reserved, but an HT STA shall protect HT transmissions as though
1104 * the HT Protection field were set to non-HT mixed mode.
1106 * In an IBSS, the RIFS Mode field of the HT Operation element is
1107 * also reserved, but an HT STA shall operate as though this field
1111 sdata->vif.bss_conf.ht_operation_mode |=
1112 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1113 | IEEE80211_HT_PARAM_RIFS_MODE;
1115 changed |= BSS_CHANGED_HT;
1116 ieee80211_bss_info_change_notify(sdata, changed);
1118 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1123 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1125 struct sk_buff *skb;
1126 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1127 struct ieee80211_local *local = sdata->local;
1128 struct cfg80211_bss *cbss;
1131 struct sta_info *sta;
1133 mutex_lock(&sdata->u.ibss.mtx);
1135 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1136 memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
1137 sdata->u.ibss.ssid_len = 0;
1139 active_ibss = ieee80211_sta_active_ibss(sdata);
1141 if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) {
1142 capability = WLAN_CAPABILITY_IBSS;
1144 if (ifibss->privacy)
1145 capability |= WLAN_CAPABILITY_PRIVACY;
1147 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->channel,
1148 ifibss->bssid, ifibss->ssid,
1149 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
1150 WLAN_CAPABILITY_PRIVACY,
1154 cfg80211_unlink_bss(local->hw.wiphy, cbss);
1155 cfg80211_put_bss(cbss);
1159 sta_info_flush(sdata->local, sdata);
1161 spin_lock_bh(&ifibss->incomplete_lock);
1162 while (!list_empty(&ifibss->incomplete_stations)) {
1163 sta = list_first_entry(&ifibss->incomplete_stations,
1164 struct sta_info, list);
1165 list_del(&sta->list);
1166 spin_unlock_bh(&ifibss->incomplete_lock);
1168 sta_info_free(local, sta);
1169 spin_lock_bh(&ifibss->incomplete_lock);
1171 spin_unlock_bh(&ifibss->incomplete_lock);
1173 netif_carrier_off(sdata->dev);
1176 kfree(sdata->u.ibss.ie);
1177 skb = rcu_dereference_protected(sdata->u.ibss.presp,
1178 lockdep_is_held(&sdata->u.ibss.mtx));
1179 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
1180 sdata->vif.bss_conf.ibss_joined = false;
1181 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
1186 skb_queue_purge(&sdata->skb_queue);
1188 del_timer_sync(&sdata->u.ibss.timer);
1190 mutex_unlock(&sdata->u.ibss.mtx);
1192 mutex_lock(&local->mtx);
1193 ieee80211_recalc_idle(sdata->local);
1194 mutex_unlock(&local->mtx);