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_MERGE_DELAY 0x400000
35 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
37 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
40 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
41 struct ieee80211_mgmt *mgmt,
44 u16 auth_alg, auth_transaction, status_code;
46 lockdep_assert_held(&sdata->u.ibss.mtx);
51 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
52 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
53 status_code = le16_to_cpu(mgmt->u.auth.status_code);
56 * IEEE 802.11 standard does not require authentication in IBSS
57 * networks and most implementations do not seem to use it.
58 * However, try to reply to authentication attempts if someone
59 * has actually implemented this.
61 if (auth_alg == WLAN_AUTH_OPEN && auth_transaction == 1)
62 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, NULL, 0,
63 sdata->u.ibss.bssid, NULL, 0, 0);
66 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
67 const u8 *bssid, const int beacon_int,
68 struct ieee80211_channel *chan,
69 const u32 basic_rates,
70 const u16 capability, u64 tsf)
72 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
73 struct ieee80211_local *local = sdata->local;
76 struct ieee80211_mgmt *mgmt;
78 struct ieee80211_supported_band *sband;
79 struct cfg80211_bss *bss;
81 u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
83 lockdep_assert_held(&ifibss->mtx);
85 /* Reset own TSF to allow time synchronization work. */
89 rcu_assign_pointer(ifibss->presp, NULL);
91 skb->data = skb->head;
93 skb_reset_tail_pointer(skb);
94 skb_reserve(skb, sdata->local->hw.extra_tx_headroom);
96 if (memcmp(ifibss->bssid, bssid, ETH_ALEN))
97 sta_info_flush(sdata->local, sdata);
99 /* if merging, indicate to driver that we leave the old IBSS */
100 if (sdata->vif.bss_conf.ibss_joined) {
101 sdata->vif.bss_conf.ibss_joined = false;
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 local->oper_channel = chan;
110 WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
111 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
113 sband = local->hw.wiphy->bands[chan->band];
115 /* build supported rates array */
117 for (i = 0; i < sband->n_bitrates; i++) {
118 int rate = sband->bitrates[i].bitrate;
120 if (basic_rates & BIT(i))
122 *pos++ = basic | (u8) (rate / 5);
125 /* Build IBSS probe response */
126 mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon));
127 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
128 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
129 IEEE80211_STYPE_PROBE_RESP);
130 memset(mgmt->da, 0xff, ETH_ALEN);
131 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
132 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
133 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
134 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
135 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
137 pos = skb_put(skb, 2 + ifibss->ssid_len);
138 *pos++ = WLAN_EID_SSID;
139 *pos++ = ifibss->ssid_len;
140 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
142 rates = sband->n_bitrates;
145 pos = skb_put(skb, 2 + rates);
146 *pos++ = WLAN_EID_SUPP_RATES;
148 memcpy(pos, supp_rates, rates);
150 if (sband->band == IEEE80211_BAND_2GHZ) {
151 pos = skb_put(skb, 2 + 1);
152 *pos++ = WLAN_EID_DS_PARAMS;
154 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
157 pos = skb_put(skb, 2 + 2);
158 *pos++ = WLAN_EID_IBSS_PARAMS;
160 /* FIX: set ATIM window based on scan results */
164 if (sband->n_bitrates > 8) {
165 rates = sband->n_bitrates - 8;
166 pos = skb_put(skb, 2 + rates);
167 *pos++ = WLAN_EID_EXT_SUPP_RATES;
169 memcpy(pos, &supp_rates[8], rates);
173 memcpy(skb_put(skb, ifibss->ie_len),
174 ifibss->ie, ifibss->ie_len);
176 rcu_assign_pointer(ifibss->presp, skb);
178 sdata->vif.bss_conf.beacon_int = beacon_int;
179 sdata->vif.bss_conf.basic_rates = basic_rates;
180 bss_change = BSS_CHANGED_BEACON_INT;
181 bss_change |= ieee80211_reset_erp_info(sdata);
182 bss_change |= BSS_CHANGED_BSSID;
183 bss_change |= BSS_CHANGED_BEACON;
184 bss_change |= BSS_CHANGED_BEACON_ENABLED;
185 bss_change |= BSS_CHANGED_BASIC_RATES;
186 bss_change |= BSS_CHANGED_IBSS;
187 sdata->vif.bss_conf.ibss_joined = true;
188 ieee80211_bss_info_change_notify(sdata, bss_change);
190 ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates);
192 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
193 mod_timer(&ifibss->timer,
194 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
196 bss = cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel,
197 mgmt, skb->len, 0, GFP_KERNEL);
198 cfg80211_put_bss(bss);
199 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
202 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
203 struct ieee80211_bss *bss)
205 struct cfg80211_bss *cbss =
206 container_of((void *)bss, struct cfg80211_bss, priv);
207 struct ieee80211_supported_band *sband;
210 u16 beacon_int = cbss->beacon_interval;
212 lockdep_assert_held(&sdata->u.ibss.mtx);
217 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
221 for (i = 0; i < bss->supp_rates_len; i++) {
222 int rate = (bss->supp_rates[i] & 0x7f) * 5;
223 bool is_basic = !!(bss->supp_rates[i] & 0x80);
225 for (j = 0; j < sband->n_bitrates; j++) {
226 if (sband->bitrates[j].bitrate == rate) {
228 basic_rates |= BIT(j);
234 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
242 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
243 struct ieee80211_mgmt *mgmt,
245 struct ieee80211_rx_status *rx_status,
246 struct ieee802_11_elems *elems,
249 struct ieee80211_local *local = sdata->local;
251 struct cfg80211_bss *cbss;
252 struct ieee80211_bss *bss;
253 struct sta_info *sta;
254 struct ieee80211_channel *channel;
255 u64 beacon_timestamp, rx_timestamp;
257 enum ieee80211_band band = rx_status->band;
259 if (elems->ds_params && elems->ds_params_len == 1)
260 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
262 freq = rx_status->freq;
264 channel = ieee80211_get_channel(local->hw.wiphy, freq);
266 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
269 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
270 memcmp(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) {
271 supp_rates = ieee80211_sta_get_rates(local, elems, band);
275 sta = sta_info_get(sdata, mgmt->sa);
279 prev_rates = sta->sta.supp_rates[band];
280 /* make sure mandatory rates are always added */
281 sta->sta.supp_rates[band] = supp_rates |
282 ieee80211_mandatory_rates(local, band);
284 if (sta->sta.supp_rates[band] != prev_rates) {
285 #ifdef CONFIG_MAC80211_IBSS_DEBUG
286 printk(KERN_DEBUG "%s: updated supp_rates set "
287 "for %pM based on beacon/probe_response "
289 sdata->name, sta->sta.addr,
290 prev_rates, sta->sta.supp_rates[band]);
292 rate_control_rate_init(sta);
297 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
298 supp_rates, GFP_KERNEL);
302 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
307 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
309 /* was just updated in ieee80211_bss_info_update */
310 beacon_timestamp = cbss->tsf;
312 /* check if we need to merge IBSS */
314 /* we use a fixed BSSID */
315 if (sdata->u.ibss.fixed_bssid)
319 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
322 /* different channel */
323 if (cbss->channel != local->oper_channel)
327 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
328 memcmp(elems->ssid, sdata->u.ibss.ssid,
329 sdata->u.ibss.ssid_len))
333 if (memcmp(cbss->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0)
336 if (rx_status->flag & RX_FLAG_TSFT) {
338 * For correct IBSS merging we need mactime; since mactime is
339 * defined as the time the first data symbol of the frame hits
340 * the PHY, and the timestamp of the beacon is defined as "the
341 * time that the data symbol containing the first bit of the
342 * timestamp is transmitted to the PHY plus the transmitting
343 * STA's delays through its local PHY from the MAC-PHY
344 * interface to its interface with the WM" (802.11 11.1.2)
345 * - equals the time this bit arrives at the receiver - we have
346 * to take into account the offset between the two.
348 * E.g. at 1 MBit that means mactime is 192 usec earlier
349 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
353 if (rx_status->flag & RX_FLAG_HT)
354 rate = 65; /* TODO: HT rates */
356 rate = local->hw.wiphy->bands[band]->
357 bitrates[rx_status->rate_idx].bitrate;
359 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
362 * second best option: get current TSF
363 * (will return -1 if not supported)
365 rx_timestamp = drv_get_tsf(local);
368 #ifdef CONFIG_MAC80211_IBSS_DEBUG
369 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
370 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
371 mgmt->sa, mgmt->bssid,
372 (unsigned long long)rx_timestamp,
373 (unsigned long long)beacon_timestamp,
374 (unsigned long long)(rx_timestamp - beacon_timestamp),
378 /* give slow hardware some time to do the TSF sync */
379 if (rx_timestamp < IEEE80211_IBSS_MERGE_DELAY)
382 if (beacon_timestamp > rx_timestamp) {
383 #ifdef CONFIG_MAC80211_IBSS_DEBUG
384 printk(KERN_DEBUG "%s: beacon TSF higher than "
385 "local TSF - IBSS merge with BSSID %pM\n",
386 sdata->name, mgmt->bssid);
388 ieee80211_sta_join_ibss(sdata, bss);
389 supp_rates = ieee80211_sta_get_rates(local, elems, band);
390 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
391 supp_rates, GFP_KERNEL);
395 ieee80211_rx_bss_put(local, bss);
399 * Add a new IBSS station, will also be called by the RX code when,
400 * in IBSS mode, receiving a frame from a yet-unknown station, hence
401 * must be callable in atomic context.
403 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
404 u8 *bssid,u8 *addr, u32 supp_rates,
407 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
408 struct ieee80211_local *local = sdata->local;
409 struct sta_info *sta;
410 int band = local->hw.conf.channel->band;
413 * XXX: Consider removing the least recently used entry and
414 * allow new one to be added.
416 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
418 printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n",
423 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
426 if (compare_ether_addr(bssid, sdata->u.ibss.bssid))
429 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
430 printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
431 wiphy_name(local->hw.wiphy), addr, sdata->name);
434 sta = sta_info_alloc(sdata, addr, gfp);
438 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
440 /* make sure mandatory rates are always added */
441 sta->sta.supp_rates[band] = supp_rates |
442 ieee80211_mandatory_rates(local, band);
444 rate_control_rate_init(sta);
446 /* If it fails, maybe we raced another insertion? */
447 if (sta_info_insert(sta))
448 return sta_info_get(sdata, addr);
452 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
454 struct ieee80211_local *local = sdata->local;
456 struct sta_info *sta;
458 lockdep_assert_held(&sdata->u.ibss.mtx);
462 list_for_each_entry_rcu(sta, &local->sta_list, list) {
463 if (sta->sdata == sdata &&
464 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
477 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
480 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
482 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
484 lockdep_assert_held(&ifibss->mtx);
486 mod_timer(&ifibss->timer,
487 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
489 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
491 if (time_before(jiffies, ifibss->last_scan_completed +
492 IEEE80211_IBSS_MERGE_INTERVAL))
495 if (ieee80211_sta_active_ibss(sdata))
498 if (ifibss->fixed_channel)
501 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
502 "IBSS networks with same SSID (merge)\n", sdata->name);
504 ieee80211_request_internal_scan(sdata,
505 ifibss->ssid, ifibss->ssid_len,
506 ifibss->fixed_channel ? ifibss->channel : NULL);
509 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
511 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
512 struct ieee80211_local *local = sdata->local;
513 struct ieee80211_supported_band *sband;
518 lockdep_assert_held(&ifibss->mtx);
520 if (ifibss->fixed_bssid) {
521 memcpy(bssid, ifibss->bssid, ETH_ALEN);
523 /* Generate random, not broadcast, locally administered BSSID. Mix in
524 * own MAC address to make sure that devices that do not have proper
525 * random number generator get different BSSID. */
526 get_random_bytes(bssid, ETH_ALEN);
527 for (i = 0; i < ETH_ALEN; i++)
528 bssid[i] ^= sdata->vif.addr[i];
533 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
536 sband = local->hw.wiphy->bands[ifibss->channel->band];
538 capability = WLAN_CAPABILITY_IBSS;
541 capability |= WLAN_CAPABILITY_PRIVACY;
543 sdata->drop_unencrypted = 0;
545 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
546 ifibss->channel, ifibss->basic_rates,
551 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
554 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
556 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
557 struct ieee80211_local *local = sdata->local;
558 struct cfg80211_bss *cbss;
559 struct ieee80211_channel *chan = NULL;
560 const u8 *bssid = NULL;
564 lockdep_assert_held(&ifibss->mtx);
566 active_ibss = ieee80211_sta_active_ibss(sdata);
567 #ifdef CONFIG_MAC80211_IBSS_DEBUG
568 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
569 sdata->name, active_ibss);
570 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
575 capability = WLAN_CAPABILITY_IBSS;
577 capability |= WLAN_CAPABILITY_PRIVACY;
578 if (ifibss->fixed_bssid)
579 bssid = ifibss->bssid;
580 if (ifibss->fixed_channel)
581 chan = ifibss->channel;
582 if (!is_zero_ether_addr(ifibss->bssid))
583 bssid = ifibss->bssid;
584 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
585 ifibss->ssid, ifibss->ssid_len,
586 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
590 struct ieee80211_bss *bss;
592 bss = (void *)cbss->priv;
593 #ifdef CONFIG_MAC80211_IBSS_DEBUG
594 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
595 "%pM\n", cbss->bssid, ifibss->bssid);
596 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
598 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
599 " based on configured SSID\n",
600 sdata->name, cbss->bssid);
602 ieee80211_sta_join_ibss(sdata, bss);
603 ieee80211_rx_bss_put(local, bss);
607 #ifdef CONFIG_MAC80211_IBSS_DEBUG
608 printk(KERN_DEBUG " did not try to join ibss\n");
609 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
611 /* Selected IBSS not found in current scan results - try to scan */
612 if (time_after(jiffies, ifibss->last_scan_completed +
613 IEEE80211_SCAN_INTERVAL)) {
614 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
615 "join\n", sdata->name);
617 ieee80211_request_internal_scan(sdata,
618 ifibss->ssid, ifibss->ssid_len,
619 ifibss->fixed_channel ? ifibss->channel : NULL);
621 int interval = IEEE80211_SCAN_INTERVAL;
623 if (time_after(jiffies, ifibss->ibss_join_req +
624 IEEE80211_IBSS_JOIN_TIMEOUT)) {
625 if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) {
626 ieee80211_sta_create_ibss(sdata);
629 printk(KERN_DEBUG "%s: IBSS not allowed on"
630 " %d MHz\n", sdata->name,
631 local->hw.conf.channel->center_freq);
633 /* No IBSS found - decrease scan interval and continue
635 interval = IEEE80211_SCAN_INTERVAL_SLOW;
638 mod_timer(&ifibss->timer,
639 round_jiffies(jiffies + interval));
643 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
644 struct ieee80211_mgmt *mgmt,
647 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
648 struct ieee80211_local *local = sdata->local;
651 struct ieee80211_mgmt *resp;
654 lockdep_assert_held(&ifibss->mtx);
656 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
657 len < 24 + 2 || !ifibss->presp)
660 tx_last_beacon = drv_tx_last_beacon(local);
662 #ifdef CONFIG_MAC80211_IBSS_DEBUG
663 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
664 " (tx_last_beacon=%d)\n",
665 sdata->name, mgmt->sa, mgmt->da,
666 mgmt->bssid, tx_last_beacon);
667 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
672 if (memcmp(mgmt->bssid, ifibss->bssid, ETH_ALEN) != 0 &&
673 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
676 end = ((u8 *) mgmt) + len;
677 pos = mgmt->u.probe_req.variable;
678 if (pos[0] != WLAN_EID_SSID ||
679 pos + 2 + pos[1] > end) {
680 #ifdef CONFIG_MAC80211_IBSS_DEBUG
681 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
683 sdata->name, mgmt->sa);
688 (pos[1] != ifibss->ssid_len ||
689 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
690 /* Ignore ProbeReq for foreign SSID */
694 /* Reply with ProbeResp */
695 skb = skb_copy(ifibss->presp, GFP_KERNEL);
699 resp = (struct ieee80211_mgmt *) skb->data;
700 memcpy(resp->da, mgmt->sa, ETH_ALEN);
701 #ifdef CONFIG_MAC80211_IBSS_DEBUG
702 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
703 sdata->name, resp->da);
704 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
705 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
706 ieee80211_tx_skb(sdata, skb);
709 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
710 struct ieee80211_mgmt *mgmt,
712 struct ieee80211_rx_status *rx_status)
715 struct ieee802_11_elems elems;
717 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
718 return; /* ignore ProbeResp to foreign address */
720 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
724 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
727 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
730 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
731 struct ieee80211_mgmt *mgmt,
733 struct ieee80211_rx_status *rx_status)
736 struct ieee802_11_elems elems;
738 /* Process beacon from the current BSS */
739 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
743 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
745 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
748 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
751 struct ieee80211_rx_status *rx_status;
752 struct ieee80211_mgmt *mgmt;
755 rx_status = IEEE80211_SKB_RXCB(skb);
756 mgmt = (struct ieee80211_mgmt *) skb->data;
757 fc = le16_to_cpu(mgmt->frame_control);
759 mutex_lock(&sdata->u.ibss.mtx);
761 switch (fc & IEEE80211_FCTL_STYPE) {
762 case IEEE80211_STYPE_PROBE_REQ:
763 ieee80211_rx_mgmt_probe_req(sdata, mgmt, skb->len);
765 case IEEE80211_STYPE_PROBE_RESP:
766 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
769 case IEEE80211_STYPE_BEACON:
770 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
773 case IEEE80211_STYPE_AUTH:
774 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
778 mutex_unlock(&sdata->u.ibss.mtx);
781 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
783 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
785 mutex_lock(&ifibss->mtx);
788 * Work could be scheduled after scan or similar
789 * when we aren't even joined (or trying) with a
792 if (!ifibss->ssid_len)
795 switch (ifibss->state) {
796 case IEEE80211_IBSS_MLME_SEARCH:
797 ieee80211_sta_find_ibss(sdata);
799 case IEEE80211_IBSS_MLME_JOINED:
800 ieee80211_sta_merge_ibss(sdata);
808 mutex_unlock(&ifibss->mtx);
811 static void ieee80211_ibss_timer(unsigned long data)
813 struct ieee80211_sub_if_data *sdata =
814 (struct ieee80211_sub_if_data *) data;
815 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
816 struct ieee80211_local *local = sdata->local;
818 if (local->quiescing) {
819 ifibss->timer_running = true;
823 ieee80211_queue_work(&local->hw, &sdata->work);
827 void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata)
829 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
831 if (del_timer_sync(&ifibss->timer))
832 ifibss->timer_running = true;
835 void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata)
837 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
839 if (ifibss->timer_running) {
840 add_timer(&ifibss->timer);
841 ifibss->timer_running = false;
846 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
848 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
850 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
851 (unsigned long) sdata);
852 mutex_init(&ifibss->mtx);
855 /* scan finished notification */
856 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
858 struct ieee80211_sub_if_data *sdata;
860 mutex_lock(&local->iflist_mtx);
861 list_for_each_entry(sdata, &local->interfaces, list) {
862 if (!ieee80211_sdata_running(sdata))
864 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
866 sdata->u.ibss.last_scan_completed = jiffies;
867 ieee80211_queue_work(&local->hw, &sdata->work);
869 mutex_unlock(&local->iflist_mtx);
872 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
873 struct cfg80211_ibss_params *params)
877 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom +
881 4 /* IBSS params */ +
886 mutex_lock(&sdata->u.ibss.mtx);
889 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
890 sdata->u.ibss.fixed_bssid = true;
892 sdata->u.ibss.fixed_bssid = false;
894 sdata->u.ibss.privacy = params->privacy;
895 sdata->u.ibss.basic_rates = params->basic_rates;
897 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
899 sdata->u.ibss.channel = params->channel;
900 sdata->u.ibss.fixed_channel = params->channel_fixed;
902 /* fix ourselves to that channel now already */
903 if (params->channel_fixed) {
904 sdata->local->oper_channel = params->channel;
905 WARN_ON(!ieee80211_set_channel_type(sdata->local, sdata,
906 NL80211_CHAN_NO_HT));
910 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
912 if (sdata->u.ibss.ie)
913 sdata->u.ibss.ie_len = params->ie_len;
916 sdata->u.ibss.skb = skb;
917 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
918 sdata->u.ibss.ibss_join_req = jiffies;
920 memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN);
921 sdata->u.ibss.ssid_len = params->ssid_len;
923 ieee80211_recalc_idle(sdata->local);
925 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
927 mutex_unlock(&sdata->u.ibss.mtx);
932 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
935 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
936 struct ieee80211_local *local = sdata->local;
937 struct cfg80211_bss *cbss;
941 mutex_lock(&sdata->u.ibss.mtx);
943 active_ibss = ieee80211_sta_active_ibss(sdata);
945 if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) {
946 capability = WLAN_CAPABILITY_IBSS;
949 capability |= WLAN_CAPABILITY_PRIVACY;
951 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->channel,
952 ifibss->bssid, ifibss->ssid,
953 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
954 WLAN_CAPABILITY_PRIVACY,
958 cfg80211_unlink_bss(local->hw.wiphy, cbss);
959 cfg80211_put_bss(cbss);
963 sta_info_flush(sdata->local, sdata);
966 kfree(sdata->u.ibss.ie);
967 skb = sdata->u.ibss.presp;
968 rcu_assign_pointer(sdata->u.ibss.presp, NULL);
969 sdata->vif.bss_conf.ibss_joined = false;
970 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
975 skb_queue_purge(&sdata->skb_queue);
976 memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
977 sdata->u.ibss.ssid_len = 0;
979 del_timer_sync(&sdata->u.ibss.timer);
981 mutex_unlock(&sdata->u.ibss.mtx);
983 ieee80211_recalc_idle(sdata->local);