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_INIT_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 void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
279 struct ieee80211_mgmt *mgmt,
281 struct ieee80211_rx_status *rx_status,
282 struct ieee802_11_elems *elems,
285 struct ieee80211_local *local = sdata->local;
287 struct cfg80211_bss *cbss;
288 struct ieee80211_bss *bss;
289 struct sta_info *sta;
290 struct ieee80211_channel *channel;
291 u64 beacon_timestamp, rx_timestamp;
293 enum ieee80211_band band = rx_status->band;
294 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
295 bool rates_updated = false;
297 if (elems->ds_params && elems->ds_params_len == 1)
298 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
301 freq = rx_status->freq;
303 channel = ieee80211_get_channel(local->hw.wiphy, freq);
305 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
308 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
309 memcmp(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) {
312 sta = sta_info_get(sdata, mgmt->sa);
314 if (elems->supp_rates) {
315 supp_rates = ieee80211_sta_get_rates(local, elems,
320 prev_rates = sta->sta.supp_rates[band];
321 /* make sure mandatory rates are always added */
322 sta->sta.supp_rates[band] = supp_rates |
323 ieee80211_mandatory_rates(local, band);
325 if (sta->sta.supp_rates[band] != prev_rates) {
326 #ifdef CONFIG_MAC80211_IBSS_DEBUG
328 "%s: updated supp_rates set "
329 "for %pM based on beacon"
330 "/probe_resp (0x%x -> 0x%x)\n",
331 sdata->name, sta->sta.addr,
333 sta->sta.supp_rates[band]);
335 rates_updated = true;
338 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
339 mgmt->sa, supp_rates,
343 if (sta && elems->wmm_info)
344 set_sta_flag(sta, WLAN_STA_WME);
346 if (sta && elems->ht_info_elem && elems->ht_cap_elem &&
347 sdata->u.ibss.channel_type != NL80211_CHAN_NO_HT) {
349 struct ieee80211_sta_ht_cap sta_ht_cap_new;
350 enum nl80211_channel_type channel_type =
351 ieee80211_ht_info_to_channel_type(
352 elems->ht_info_elem);
354 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
359 * fall back to HT20 if we don't use or use
360 * the other extension channel
362 if ((channel_type == NL80211_CHAN_HT40MINUS ||
363 channel_type == NL80211_CHAN_HT40PLUS) &&
364 channel_type != sdata->u.ibss.channel_type)
365 sta_ht_cap_new.cap &=
366 ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
368 if (memcmp(&sta->sta.ht_cap, &sta_ht_cap_new,
369 sizeof(sta_ht_cap_new))) {
370 memcpy(&sta->sta.ht_cap, &sta_ht_cap_new,
371 sizeof(sta_ht_cap_new));
372 rates_updated = true;
376 if (sta && rates_updated)
377 rate_control_rate_init(sta);
382 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
387 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
389 /* was just updated in ieee80211_bss_info_update */
390 beacon_timestamp = cbss->tsf;
392 /* check if we need to merge IBSS */
394 /* we use a fixed BSSID */
395 if (sdata->u.ibss.fixed_bssid)
399 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
402 /* different channel */
403 if (cbss->channel != local->oper_channel)
407 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
408 memcmp(elems->ssid, sdata->u.ibss.ssid,
409 sdata->u.ibss.ssid_len))
413 if (memcmp(cbss->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0)
416 if (rx_status->flag & RX_FLAG_MACTIME_MPDU) {
418 * For correct IBSS merging we need mactime; since mactime is
419 * defined as the time the first data symbol of the frame hits
420 * the PHY, and the timestamp of the beacon is defined as "the
421 * time that the data symbol containing the first bit of the
422 * timestamp is transmitted to the PHY plus the transmitting
423 * STA's delays through its local PHY from the MAC-PHY
424 * interface to its interface with the WM" (802.11 11.1.2)
425 * - equals the time this bit arrives at the receiver - we have
426 * to take into account the offset between the two.
428 * E.g. at 1 MBit that means mactime is 192 usec earlier
429 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
433 if (rx_status->flag & RX_FLAG_HT)
434 rate = 65; /* TODO: HT rates */
436 rate = local->hw.wiphy->bands[band]->
437 bitrates[rx_status->rate_idx].bitrate;
439 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
442 * second best option: get current TSF
443 * (will return -1 if not supported)
445 rx_timestamp = drv_get_tsf(local, sdata);
448 #ifdef CONFIG_MAC80211_IBSS_DEBUG
449 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
450 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
451 mgmt->sa, mgmt->bssid,
452 (unsigned long long)rx_timestamp,
453 (unsigned long long)beacon_timestamp,
454 (unsigned long long)(rx_timestamp - beacon_timestamp),
458 if (beacon_timestamp > rx_timestamp) {
459 #ifdef CONFIG_MAC80211_IBSS_DEBUG
460 printk(KERN_DEBUG "%s: beacon TSF higher than "
461 "local TSF - IBSS merge with BSSID %pM\n",
462 sdata->name, mgmt->bssid);
464 ieee80211_sta_join_ibss(sdata, bss);
465 supp_rates = ieee80211_sta_get_rates(local, elems, band);
466 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
467 supp_rates, GFP_KERNEL);
471 ieee80211_rx_bss_put(local, bss);
475 * Add a new IBSS station, will also be called by the RX code when,
476 * in IBSS mode, receiving a frame from a yet-unknown station, hence
477 * must be callable in atomic context.
479 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
480 u8 *bssid, u8 *addr, u32 supp_rates,
483 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
484 struct ieee80211_local *local = sdata->local;
485 struct sta_info *sta;
486 int band = local->hw.conf.channel->band;
489 * XXX: Consider removing the least recently used entry and
490 * allow new one to be added.
492 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
494 printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n",
499 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
502 if (compare_ether_addr(bssid, sdata->u.ibss.bssid))
505 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
506 wiphy_debug(local->hw.wiphy, "Adding new IBSS station %pM (dev=%s)\n",
510 sta = sta_info_alloc(sdata, addr, gfp);
514 sta->last_rx = jiffies;
515 set_sta_flag(sta, WLAN_STA_AUTHORIZED);
517 /* make sure mandatory rates are always added */
518 sta->sta.supp_rates[band] = supp_rates |
519 ieee80211_mandatory_rates(local, band);
521 rate_control_rate_init(sta);
523 /* If it fails, maybe we raced another insertion? */
524 if (sta_info_insert(sta))
525 return sta_info_get(sdata, addr);
529 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
531 struct ieee80211_local *local = sdata->local;
533 struct sta_info *sta;
535 lockdep_assert_held(&sdata->u.ibss.mtx);
539 list_for_each_entry_rcu(sta, &local->sta_list, list) {
540 if (sta->sdata == sdata &&
541 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
554 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
557 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
559 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
561 lockdep_assert_held(&ifibss->mtx);
563 mod_timer(&ifibss->timer,
564 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
566 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
568 if (time_before(jiffies, ifibss->last_scan_completed +
569 IEEE80211_IBSS_MERGE_INTERVAL))
572 if (ieee80211_sta_active_ibss(sdata))
575 if (ifibss->fixed_channel)
578 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
579 "IBSS networks with same SSID (merge)\n", sdata->name);
581 ieee80211_request_internal_scan(sdata,
582 ifibss->ssid, ifibss->ssid_len,
583 ifibss->fixed_channel ? ifibss->channel : NULL);
586 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
588 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
593 lockdep_assert_held(&ifibss->mtx);
595 if (ifibss->fixed_bssid) {
596 memcpy(bssid, ifibss->bssid, ETH_ALEN);
598 /* Generate random, not broadcast, locally administered BSSID. Mix in
599 * own MAC address to make sure that devices that do not have proper
600 * random number generator get different BSSID. */
601 get_random_bytes(bssid, ETH_ALEN);
602 for (i = 0; i < ETH_ALEN; i++)
603 bssid[i] ^= sdata->vif.addr[i];
608 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
611 capability = WLAN_CAPABILITY_IBSS;
614 capability |= WLAN_CAPABILITY_PRIVACY;
616 sdata->drop_unencrypted = 0;
618 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
619 ifibss->channel, ifibss->basic_rates,
624 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
627 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
629 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
630 struct ieee80211_local *local = sdata->local;
631 struct cfg80211_bss *cbss;
632 struct ieee80211_channel *chan = NULL;
633 const u8 *bssid = NULL;
637 lockdep_assert_held(&ifibss->mtx);
639 active_ibss = ieee80211_sta_active_ibss(sdata);
640 #ifdef CONFIG_MAC80211_IBSS_DEBUG
641 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
642 sdata->name, active_ibss);
643 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
648 capability = WLAN_CAPABILITY_IBSS;
650 capability |= WLAN_CAPABILITY_PRIVACY;
651 if (ifibss->fixed_bssid)
652 bssid = ifibss->bssid;
653 if (ifibss->fixed_channel)
654 chan = ifibss->channel;
655 if (!is_zero_ether_addr(ifibss->bssid))
656 bssid = ifibss->bssid;
657 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
658 ifibss->ssid, ifibss->ssid_len,
659 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
663 struct ieee80211_bss *bss;
665 bss = (void *)cbss->priv;
666 #ifdef CONFIG_MAC80211_IBSS_DEBUG
667 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
668 "%pM\n", cbss->bssid, ifibss->bssid);
669 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
671 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
672 " based on configured SSID\n",
673 sdata->name, cbss->bssid);
675 ieee80211_sta_join_ibss(sdata, bss);
676 ieee80211_rx_bss_put(local, bss);
680 #ifdef CONFIG_MAC80211_IBSS_DEBUG
681 printk(KERN_DEBUG " did not try to join ibss\n");
682 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
684 /* Selected IBSS not found in current scan results - try to scan */
685 if (time_after(jiffies, ifibss->last_scan_completed +
686 IEEE80211_SCAN_INTERVAL)) {
687 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
688 "join\n", sdata->name);
690 ieee80211_request_internal_scan(sdata,
691 ifibss->ssid, ifibss->ssid_len,
692 ifibss->fixed_channel ? ifibss->channel : NULL);
694 int interval = IEEE80211_SCAN_INTERVAL;
696 if (time_after(jiffies, ifibss->ibss_join_req +
697 IEEE80211_IBSS_JOIN_TIMEOUT)) {
698 if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) {
699 ieee80211_sta_create_ibss(sdata);
702 printk(KERN_DEBUG "%s: IBSS not allowed on"
703 " %d MHz\n", sdata->name,
704 local->hw.conf.channel->center_freq);
706 /* No IBSS found - decrease scan interval and continue
708 interval = IEEE80211_SCAN_INTERVAL_SLOW;
711 mod_timer(&ifibss->timer,
712 round_jiffies(jiffies + interval));
716 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
719 struct ieee80211_mgmt *mgmt = (void *)req->data;
720 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
721 struct ieee80211_local *local = sdata->local;
722 int tx_last_beacon, len = req->len;
724 struct ieee80211_mgmt *resp;
725 struct sk_buff *presp;
728 lockdep_assert_held(&ifibss->mtx);
730 presp = rcu_dereference_protected(ifibss->presp,
731 lockdep_is_held(&ifibss->mtx));
733 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
734 len < 24 + 2 || !presp)
737 tx_last_beacon = drv_tx_last_beacon(local);
739 #ifdef CONFIG_MAC80211_IBSS_DEBUG
740 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
741 " (tx_last_beacon=%d)\n",
742 sdata->name, mgmt->sa, mgmt->da,
743 mgmt->bssid, tx_last_beacon);
744 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
746 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
749 if (memcmp(mgmt->bssid, ifibss->bssid, ETH_ALEN) != 0 &&
750 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
753 end = ((u8 *) mgmt) + len;
754 pos = mgmt->u.probe_req.variable;
755 if (pos[0] != WLAN_EID_SSID ||
756 pos + 2 + pos[1] > end) {
757 #ifdef CONFIG_MAC80211_IBSS_DEBUG
758 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
760 sdata->name, mgmt->sa);
765 (pos[1] != ifibss->ssid_len ||
766 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
767 /* Ignore ProbeReq for foreign SSID */
771 /* Reply with ProbeResp */
772 skb = skb_copy(presp, GFP_KERNEL);
776 resp = (struct ieee80211_mgmt *) skb->data;
777 memcpy(resp->da, mgmt->sa, ETH_ALEN);
778 #ifdef CONFIG_MAC80211_IBSS_DEBUG
779 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
780 sdata->name, resp->da);
781 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
782 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
783 ieee80211_tx_skb(sdata, skb);
786 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
787 struct ieee80211_mgmt *mgmt,
789 struct ieee80211_rx_status *rx_status)
792 struct ieee802_11_elems elems;
794 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
795 return; /* ignore ProbeResp to foreign address */
797 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
801 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
804 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
807 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
808 struct ieee80211_mgmt *mgmt,
810 struct ieee80211_rx_status *rx_status)
813 struct ieee802_11_elems elems;
815 /* Process beacon from the current BSS */
816 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
820 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
822 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
825 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
828 struct ieee80211_rx_status *rx_status;
829 struct ieee80211_mgmt *mgmt;
832 rx_status = IEEE80211_SKB_RXCB(skb);
833 mgmt = (struct ieee80211_mgmt *) skb->data;
834 fc = le16_to_cpu(mgmt->frame_control);
836 mutex_lock(&sdata->u.ibss.mtx);
838 if (!sdata->u.ibss.ssid_len)
839 goto mgmt_out; /* not ready to merge yet */
841 switch (fc & IEEE80211_FCTL_STYPE) {
842 case IEEE80211_STYPE_PROBE_REQ:
843 ieee80211_rx_mgmt_probe_req(sdata, skb);
845 case IEEE80211_STYPE_PROBE_RESP:
846 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
849 case IEEE80211_STYPE_BEACON:
850 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
853 case IEEE80211_STYPE_AUTH:
854 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
859 mutex_unlock(&sdata->u.ibss.mtx);
862 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
864 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
866 mutex_lock(&ifibss->mtx);
869 * Work could be scheduled after scan or similar
870 * when we aren't even joined (or trying) with a
873 if (!ifibss->ssid_len)
876 switch (ifibss->state) {
877 case IEEE80211_IBSS_MLME_SEARCH:
878 ieee80211_sta_find_ibss(sdata);
880 case IEEE80211_IBSS_MLME_JOINED:
881 ieee80211_sta_merge_ibss(sdata);
889 mutex_unlock(&ifibss->mtx);
892 static void ieee80211_ibss_timer(unsigned long data)
894 struct ieee80211_sub_if_data *sdata =
895 (struct ieee80211_sub_if_data *) data;
896 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
897 struct ieee80211_local *local = sdata->local;
899 if (local->quiescing) {
900 ifibss->timer_running = true;
904 ieee80211_queue_work(&local->hw, &sdata->work);
908 void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata)
910 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
912 if (del_timer_sync(&ifibss->timer))
913 ifibss->timer_running = true;
916 void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata)
918 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
920 if (ifibss->timer_running) {
921 add_timer(&ifibss->timer);
922 ifibss->timer_running = false;
927 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
929 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
931 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
932 (unsigned long) sdata);
933 mutex_init(&ifibss->mtx);
936 /* scan finished notification */
937 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
939 struct ieee80211_sub_if_data *sdata;
941 mutex_lock(&local->iflist_mtx);
942 list_for_each_entry(sdata, &local->interfaces, list) {
943 if (!ieee80211_sdata_running(sdata))
945 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
947 sdata->u.ibss.last_scan_completed = jiffies;
948 ieee80211_queue_work(&local->hw, &sdata->work);
950 mutex_unlock(&local->iflist_mtx);
953 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
954 struct cfg80211_ibss_params *params)
959 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom +
960 sizeof(struct ieee80211_hdr_3addr) +
961 12 /* struct ieee80211_mgmt.u.beacon */ +
962 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
963 2 + 8 /* max Supported Rates */ +
964 3 /* max DS params */ +
965 4 /* IBSS params */ +
966 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
967 2 + sizeof(struct ieee80211_ht_cap) +
968 2 + sizeof(struct ieee80211_ht_info) +
973 mutex_lock(&sdata->u.ibss.mtx);
976 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
977 sdata->u.ibss.fixed_bssid = true;
979 sdata->u.ibss.fixed_bssid = false;
981 sdata->u.ibss.privacy = params->privacy;
982 sdata->u.ibss.basic_rates = params->basic_rates;
983 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
984 sizeof(params->mcast_rate));
986 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
988 sdata->u.ibss.channel = params->channel;
989 sdata->u.ibss.channel_type = params->channel_type;
990 sdata->u.ibss.fixed_channel = params->channel_fixed;
992 /* fix ourselves to that channel now already */
993 if (params->channel_fixed) {
994 sdata->local->oper_channel = params->channel;
995 if (!ieee80211_set_channel_type(sdata->local, sdata,
996 params->channel_type)) {
997 mutex_unlock(&sdata->u.ibss.mtx);
1004 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1006 if (sdata->u.ibss.ie)
1007 sdata->u.ibss.ie_len = params->ie_len;
1010 sdata->u.ibss.skb = skb;
1011 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1012 sdata->u.ibss.ibss_join_req = jiffies;
1014 memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN);
1015 sdata->u.ibss.ssid_len = params->ssid_len;
1017 mutex_unlock(&sdata->u.ibss.mtx);
1019 mutex_lock(&sdata->local->mtx);
1020 ieee80211_recalc_idle(sdata->local);
1021 mutex_unlock(&sdata->local->mtx);
1024 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1025 * reserved, but an HT STA shall protect HT transmissions as though
1026 * the HT Protection field were set to non-HT mixed mode.
1028 * In an IBSS, the RIFS Mode field of the HT Operation element is
1029 * also reserved, but an HT STA shall operate as though this field
1033 sdata->vif.bss_conf.ht_operation_mode |=
1034 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1035 | IEEE80211_HT_PARAM_RIFS_MODE;
1037 changed |= BSS_CHANGED_HT;
1038 ieee80211_bss_info_change_notify(sdata, changed);
1040 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1045 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1047 struct sk_buff *skb;
1048 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1049 struct ieee80211_local *local = sdata->local;
1050 struct cfg80211_bss *cbss;
1054 mutex_lock(&sdata->u.ibss.mtx);
1056 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1057 memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
1058 sdata->u.ibss.ssid_len = 0;
1060 active_ibss = ieee80211_sta_active_ibss(sdata);
1062 if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) {
1063 capability = WLAN_CAPABILITY_IBSS;
1065 if (ifibss->privacy)
1066 capability |= WLAN_CAPABILITY_PRIVACY;
1068 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->channel,
1069 ifibss->bssid, ifibss->ssid,
1070 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
1071 WLAN_CAPABILITY_PRIVACY,
1075 cfg80211_unlink_bss(local->hw.wiphy, cbss);
1076 cfg80211_put_bss(cbss);
1080 sta_info_flush(sdata->local, sdata);
1081 netif_carrier_off(sdata->dev);
1084 kfree(sdata->u.ibss.ie);
1085 skb = rcu_dereference_protected(sdata->u.ibss.presp,
1086 lockdep_is_held(&sdata->u.ibss.mtx));
1087 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
1088 sdata->vif.bss_conf.ibss_joined = false;
1089 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
1094 skb_queue_purge(&sdata->skb_queue);
1096 del_timer_sync(&sdata->u.ibss.timer);
1098 mutex_unlock(&sdata->u.ibss.mtx);
1100 mutex_lock(&local->mtx);
1101 ieee80211_recalc_idle(sdata->local);
1102 mutex_unlock(&local->mtx);