blob: 10d13856f86c5f338c2923e887e34ecf090f35d8 [file] [log] [blame]
Johannes Berg46900292009-02-15 12:44:28 +01001/*
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>
9 *
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.
13 */
14
15#include <linux/delay.h>
16#include <linux/if_ether.h>
17#include <linux/skbuff.h>
18#include <linux/if_arp.h>
19#include <linux/etherdevice.h>
20#include <linux/rtnetlink.h>
21#include <net/mac80211.h>
22#include <asm/unaligned.h>
23
24#include "ieee80211_i.h"
Johannes Berg24487982009-04-23 18:52:52 +020025#include "driver-ops.h"
Johannes Berg46900292009-02-15 12:44:28 +010026#include "rate.h"
27
28#define IEEE80211_SCAN_INTERVAL (2 * HZ)
29#define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
30#define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
31
32#define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
Alina Friedrichsen4a332a32009-02-22 18:19:33 +010033#define IEEE80211_IBSS_MERGE_DELAY 0x400000
Johannes Berg46900292009-02-15 12:44:28 +010034#define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
35
36#define IEEE80211_IBSS_MAX_STA_ENTRIES 128
37
38
39static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
40 struct ieee80211_mgmt *mgmt,
41 size_t len)
42{
43 u16 auth_alg, auth_transaction, status_code;
44
45 if (len < 24 + 6)
46 return;
47
48 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
49 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
50 status_code = le16_to_cpu(mgmt->u.auth.status_code);
51
52 /*
53 * IEEE 802.11 standard does not require authentication in IBSS
54 * networks and most implementations do not seem to use it.
55 * However, try to reply to authentication attempts if someone
56 * has actually implemented this.
57 */
58 if (auth_alg == WLAN_AUTH_OPEN && auth_transaction == 1)
59 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, NULL, 0,
Johannes Bergfffd0932009-07-08 14:22:54 +020060 sdata->u.ibss.bssid, NULL, 0, 0);
Johannes Berg46900292009-02-15 12:44:28 +010061}
62
Johannes Bergaf8cdcd2009-04-19 21:25:43 +020063static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
64 const u8 *bssid, const int beacon_int,
65 struct ieee80211_channel *chan,
Johannes Bergb59066a2009-05-12 21:18:38 +020066 const u32 basic_rates,
Johannes Bergaf8cdcd2009-04-19 21:25:43 +020067 const u16 capability, u64 tsf)
Johannes Berg46900292009-02-15 12:44:28 +010068{
69 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
70 struct ieee80211_local *local = sdata->local;
Johannes Bergb59066a2009-05-12 21:18:38 +020071 int rates, i;
Johannes Berg46900292009-02-15 12:44:28 +010072 struct sk_buff *skb;
73 struct ieee80211_mgmt *mgmt;
74 u8 *pos;
75 struct ieee80211_supported_band *sband;
Johannes Bergf446d102009-10-28 15:12:32 +010076 struct cfg80211_bss *bss;
Johannes Berg57c4d7b2009-04-23 16:10:04 +020077 u32 bss_change;
Johannes Bergb59066a2009-05-12 21:18:38 +020078 u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
Johannes Berg24487982009-04-23 18:52:52 +020079
80 /* Reset own TSF to allow time synchronization work. */
81 drv_reset_tsf(local);
Johannes Berg46900292009-02-15 12:44:28 +010082
Johannes Bergaf8cdcd2009-04-19 21:25:43 +020083 skb = ifibss->skb;
84 rcu_assign_pointer(ifibss->presp, NULL);
85 synchronize_rcu();
86 skb->data = skb->head;
87 skb->len = 0;
88 skb_reset_tail_pointer(skb);
89 skb_reserve(skb, sdata->local->hw.extra_tx_headroom);
Johannes Berg46900292009-02-15 12:44:28 +010090
Johannes Bergaf8cdcd2009-04-19 21:25:43 +020091 if (memcmp(ifibss->bssid, bssid, ETH_ALEN))
92 sta_info_flush(sdata->local, sdata);
Johannes Berg46900292009-02-15 12:44:28 +010093
94 memcpy(ifibss->bssid, bssid, ETH_ALEN);
Johannes Berg46900292009-02-15 12:44:28 +010095
Johannes Bergaf8cdcd2009-04-19 21:25:43 +020096 sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
Johannes Berg46900292009-02-15 12:44:28 +010097
Johannes Bergaf8cdcd2009-04-19 21:25:43 +020098 local->oper_channel = chan;
99 local->oper_channel_type = NL80211_CHAN_NO_HT;
100 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
Johannes Berg57c4d7b2009-04-23 16:10:04 +0200101
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200102 sband = local->hw.wiphy->bands[chan->band];
Johannes Berg46900292009-02-15 12:44:28 +0100103
Johannes Bergb59066a2009-05-12 21:18:38 +0200104 /* build supported rates array */
105 pos = supp_rates;
106 for (i = 0; i < sband->n_bitrates; i++) {
107 int rate = sband->bitrates[i].bitrate;
108 u8 basic = 0;
109 if (basic_rates & BIT(i))
110 basic = 0x80;
111 *pos++ = basic | (u8) (rate / 5);
112 }
113
Johannes Berg46900292009-02-15 12:44:28 +0100114 /* Build IBSS probe response */
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200115 mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon));
Johannes Berg46900292009-02-15 12:44:28 +0100116 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
117 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
118 IEEE80211_STYPE_PROBE_RESP);
119 memset(mgmt->da, 0xff, ETH_ALEN);
120 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
121 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
Johannes Berg57c4d7b2009-04-23 16:10:04 +0200122 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
Sujith707c1b42009-03-03 10:15:10 +0530123 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
Johannes Berg46900292009-02-15 12:44:28 +0100124 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
125
126 pos = skb_put(skb, 2 + ifibss->ssid_len);
127 *pos++ = WLAN_EID_SSID;
128 *pos++ = ifibss->ssid_len;
129 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
130
Johannes Bergb59066a2009-05-12 21:18:38 +0200131 rates = sband->n_bitrates;
Johannes Berg46900292009-02-15 12:44:28 +0100132 if (rates > 8)
133 rates = 8;
134 pos = skb_put(skb, 2 + rates);
135 *pos++ = WLAN_EID_SUPP_RATES;
136 *pos++ = rates;
137 memcpy(pos, supp_rates, rates);
138
139 if (sband->band == IEEE80211_BAND_2GHZ) {
140 pos = skb_put(skb, 2 + 1);
141 *pos++ = WLAN_EID_DS_PARAMS;
142 *pos++ = 1;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200143 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
Johannes Berg46900292009-02-15 12:44:28 +0100144 }
145
146 pos = skb_put(skb, 2 + 2);
147 *pos++ = WLAN_EID_IBSS_PARAMS;
148 *pos++ = 2;
149 /* FIX: set ATIM window based on scan results */
150 *pos++ = 0;
151 *pos++ = 0;
152
Johannes Bergb59066a2009-05-12 21:18:38 +0200153 if (sband->n_bitrates > 8) {
154 rates = sband->n_bitrates - 8;
Johannes Berg46900292009-02-15 12:44:28 +0100155 pos = skb_put(skb, 2 + rates);
156 *pos++ = WLAN_EID_EXT_SUPP_RATES;
157 *pos++ = rates;
158 memcpy(pos, &supp_rates[8], rates);
159 }
160
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200161 if (ifibss->ie_len)
162 memcpy(skb_put(skb, ifibss->ie_len),
163 ifibss->ie, ifibss->ie_len);
164
165 rcu_assign_pointer(ifibss->presp, skb);
Johannes Berg46900292009-02-15 12:44:28 +0100166
Johannes Berg2d0ddec2009-04-23 16:13:26 +0200167 sdata->vif.bss_conf.beacon_int = beacon_int;
168 bss_change = BSS_CHANGED_BEACON_INT;
169 bss_change |= ieee80211_reset_erp_info(sdata);
170 bss_change |= BSS_CHANGED_BSSID;
171 bss_change |= BSS_CHANGED_BEACON;
172 bss_change |= BSS_CHANGED_BEACON_ENABLED;
173 ieee80211_bss_info_change_notify(sdata, bss_change);
Johannes Berg46900292009-02-15 12:44:28 +0100174
Johannes Bergb59066a2009-05-12 21:18:38 +0200175 ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates);
Johannes Berg46900292009-02-15 12:44:28 +0100176
Johannes Berg46900292009-02-15 12:44:28 +0100177 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200178 mod_timer(&ifibss->timer,
179 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
Johannes Berg46900292009-02-15 12:44:28 +0100180
Johannes Bergf446d102009-10-28 15:12:32 +0100181 bss = cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel,
182 mgmt, skb->len, 0, GFP_KERNEL);
183 cfg80211_put_bss(bss);
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200184 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
Johannes Berg46900292009-02-15 12:44:28 +0100185}
186
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200187static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
188 struct ieee80211_bss *bss)
Johannes Berg46900292009-02-15 12:44:28 +0100189{
Johannes Bergb59066a2009-05-12 21:18:38 +0200190 struct ieee80211_supported_band *sband;
191 u32 basic_rates;
192 int i, j;
Johannes Berg57c4d7b2009-04-23 16:10:04 +0200193 u16 beacon_int = bss->cbss.beacon_interval;
194
195 if (beacon_int < 10)
196 beacon_int = 10;
197
Johannes Bergb59066a2009-05-12 21:18:38 +0200198 sband = sdata->local->hw.wiphy->bands[bss->cbss.channel->band];
199
200 basic_rates = 0;
201
202 for (i = 0; i < bss->supp_rates_len; i++) {
203 int rate = (bss->supp_rates[i] & 0x7f) * 5;
204 bool is_basic = !!(bss->supp_rates[i] & 0x80);
205
206 for (j = 0; j < sband->n_bitrates; j++) {
207 if (sband->bitrates[j].bitrate == rate) {
208 if (is_basic)
209 basic_rates |= BIT(j);
210 break;
211 }
212 }
213 }
214
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200215 __ieee80211_sta_join_ibss(sdata, bss->cbss.bssid,
Johannes Berg57c4d7b2009-04-23 16:10:04 +0200216 beacon_int,
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200217 bss->cbss.channel,
Johannes Bergb59066a2009-05-12 21:18:38 +0200218 basic_rates,
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200219 bss->cbss.capability,
220 bss->cbss.tsf);
Johannes Berg46900292009-02-15 12:44:28 +0100221}
222
223static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
224 struct ieee80211_mgmt *mgmt,
225 size_t len,
226 struct ieee80211_rx_status *rx_status,
227 struct ieee802_11_elems *elems,
228 bool beacon)
229{
230 struct ieee80211_local *local = sdata->local;
231 int freq;
232 struct ieee80211_bss *bss;
233 struct sta_info *sta;
234 struct ieee80211_channel *channel;
235 u64 beacon_timestamp, rx_timestamp;
236 u32 supp_rates = 0;
237 enum ieee80211_band band = rx_status->band;
238
239 if (elems->ds_params && elems->ds_params_len == 1)
240 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
241 else
242 freq = rx_status->freq;
243
244 channel = ieee80211_get_channel(local->hw.wiphy, freq);
245
246 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
247 return;
248
249 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
250 memcmp(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) {
251 supp_rates = ieee80211_sta_get_rates(local, elems, band);
252
253 rcu_read_lock();
254
255 sta = sta_info_get(local, mgmt->sa);
256 if (sta) {
257 u32 prev_rates;
258
259 prev_rates = sta->sta.supp_rates[band];
260 /* make sure mandatory rates are always added */
261 sta->sta.supp_rates[band] = supp_rates |
262 ieee80211_mandatory_rates(local, band);
263
264#ifdef CONFIG_MAC80211_IBSS_DEBUG
265 if (sta->sta.supp_rates[band] != prev_rates)
266 printk(KERN_DEBUG "%s: updated supp_rates set "
267 "for %pM based on beacon info (0x%llx | "
268 "0x%llx -> 0x%llx)\n",
269 sdata->dev->name,
270 sta->sta.addr,
271 (unsigned long long) prev_rates,
272 (unsigned long long) supp_rates,
273 (unsigned long long) sta->sta.supp_rates[band]);
274#endif
275 } else
276 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
277
278 rcu_read_unlock();
279 }
280
281 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
282 channel, beacon);
283 if (!bss)
284 return;
285
286 /* was just updated in ieee80211_bss_info_update */
287 beacon_timestamp = bss->cbss.tsf;
288
289 /* check if we need to merge IBSS */
290
291 /* merge only on beacons (???) */
292 if (!beacon)
293 goto put_bss;
294
295 /* we use a fixed BSSID */
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200296 if (sdata->u.ibss.bssid)
Johannes Berg46900292009-02-15 12:44:28 +0100297 goto put_bss;
298
299 /* not an IBSS */
300 if (!(bss->cbss.capability & WLAN_CAPABILITY_IBSS))
301 goto put_bss;
302
303 /* different channel */
304 if (bss->cbss.channel != local->oper_channel)
305 goto put_bss;
306
307 /* different SSID */
308 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
309 memcmp(elems->ssid, sdata->u.ibss.ssid,
310 sdata->u.ibss.ssid_len))
311 goto put_bss;
312
Alina Friedrichsen34e8f082009-02-22 00:07:28 +0100313 /* same BSSID */
314 if (memcmp(bss->cbss.bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0)
315 goto put_bss;
316
Johannes Berg46900292009-02-15 12:44:28 +0100317 if (rx_status->flag & RX_FLAG_TSFT) {
318 /*
319 * For correct IBSS merging we need mactime; since mactime is
320 * defined as the time the first data symbol of the frame hits
321 * the PHY, and the timestamp of the beacon is defined as "the
322 * time that the data symbol containing the first bit of the
323 * timestamp is transmitted to the PHY plus the transmitting
324 * STA's delays through its local PHY from the MAC-PHY
325 * interface to its interface with the WM" (802.11 11.1.2)
326 * - equals the time this bit arrives at the receiver - we have
327 * to take into account the offset between the two.
328 *
329 * E.g. at 1 MBit that means mactime is 192 usec earlier
330 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
331 */
332 int rate;
333
334 if (rx_status->flag & RX_FLAG_HT)
335 rate = 65; /* TODO: HT rates */
336 else
337 rate = local->hw.wiphy->bands[band]->
338 bitrates[rx_status->rate_idx].bitrate;
339
340 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
Johannes Berg24487982009-04-23 18:52:52 +0200341 } else {
342 /*
343 * second best option: get current TSF
344 * (will return -1 if not supported)
345 */
346 rx_timestamp = drv_get_tsf(local);
347 }
Johannes Berg46900292009-02-15 12:44:28 +0100348
349#ifdef CONFIG_MAC80211_IBSS_DEBUG
350 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
351 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
352 mgmt->sa, mgmt->bssid,
353 (unsigned long long)rx_timestamp,
354 (unsigned long long)beacon_timestamp,
355 (unsigned long long)(rx_timestamp - beacon_timestamp),
356 jiffies);
357#endif
358
Alina Friedrichsen4a332a32009-02-22 18:19:33 +0100359 /* give slow hardware some time to do the TSF sync */
360 if (rx_timestamp < IEEE80211_IBSS_MERGE_DELAY)
361 goto put_bss;
362
Johannes Berg46900292009-02-15 12:44:28 +0100363 if (beacon_timestamp > rx_timestamp) {
364#ifdef CONFIG_MAC80211_IBSS_DEBUG
365 printk(KERN_DEBUG "%s: beacon TSF higher than "
366 "local TSF - IBSS merge with BSSID %pM\n",
367 sdata->dev->name, mgmt->bssid);
368#endif
369 ieee80211_sta_join_ibss(sdata, bss);
370 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
371 }
372
373 put_bss:
374 ieee80211_rx_bss_put(local, bss);
375}
376
377/*
378 * Add a new IBSS station, will also be called by the RX code when,
379 * in IBSS mode, receiving a frame from a yet-unknown station, hence
380 * must be callable in atomic context.
381 */
382struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
383 u8 *bssid,u8 *addr, u32 supp_rates)
384{
385 struct ieee80211_local *local = sdata->local;
386 struct sta_info *sta;
387 int band = local->hw.conf.channel->band;
388
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200389 /*
390 * XXX: Consider removing the least recently used entry and
391 * allow new one to be added.
392 */
Johannes Berg46900292009-02-15 12:44:28 +0100393 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200394 if (net_ratelimit())
395 printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n",
396 sdata->dev->name, addr);
Johannes Berg46900292009-02-15 12:44:28 +0100397 return NULL;
398 }
399
400 if (compare_ether_addr(bssid, sdata->u.ibss.bssid))
401 return NULL;
402
403#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
404 printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
405 wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
406#endif
407
408 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
409 if (!sta)
410 return NULL;
411
412 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
413
414 /* make sure mandatory rates are always added */
415 sta->sta.supp_rates[band] = supp_rates |
416 ieee80211_mandatory_rates(local, band);
417
418 rate_control_rate_init(sta);
419
420 if (sta_info_insert(sta))
421 return NULL;
422
423 return sta;
424}
425
426static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
427{
428 struct ieee80211_local *local = sdata->local;
429 int active = 0;
430 struct sta_info *sta;
431
432 rcu_read_lock();
433
434 list_for_each_entry_rcu(sta, &local->sta_list, list) {
435 if (sta->sdata == sdata &&
436 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
437 jiffies)) {
438 active++;
439 break;
440 }
441 }
442
443 rcu_read_unlock();
444
445 return active;
446}
447
448
449static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
450{
451 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
452
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200453 mod_timer(&ifibss->timer,
454 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
Johannes Berg46900292009-02-15 12:44:28 +0100455
456 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200457
Sujith450aae32009-11-02 12:33:23 +0530458 if (time_before(jiffies, ifibss->last_scan_completed +
459 IEEE80211_IBSS_MERGE_INTERVAL))
460 return;
461
Johannes Berg46900292009-02-15 12:44:28 +0100462 if (ieee80211_sta_active_ibss(sdata))
463 return;
464
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200465 if (ifibss->fixed_channel)
Johannes Berg46900292009-02-15 12:44:28 +0100466 return;
467
468 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
469 "IBSS networks with same SSID (merge)\n", sdata->dev->name);
470
Johannes Bergf3b85252009-04-23 16:01:47 +0200471 ieee80211_request_internal_scan(sdata, ifibss->ssid, ifibss->ssid_len);
Johannes Berg46900292009-02-15 12:44:28 +0100472}
473
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200474static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
Johannes Berg46900292009-02-15 12:44:28 +0100475{
476 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
477 struct ieee80211_local *local = sdata->local;
478 struct ieee80211_supported_band *sband;
Johannes Berg46900292009-02-15 12:44:28 +0100479 u8 bssid[ETH_ALEN];
Johannes Berg46900292009-02-15 12:44:28 +0100480 u16 capability;
481 int i;
482
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200483 if (ifibss->fixed_bssid) {
Johannes Berg46900292009-02-15 12:44:28 +0100484 memcpy(bssid, ifibss->bssid, ETH_ALEN);
485 } else {
486 /* Generate random, not broadcast, locally administered BSSID. Mix in
487 * own MAC address to make sure that devices that do not have proper
488 * random number generator get different BSSID. */
489 get_random_bytes(bssid, ETH_ALEN);
490 for (i = 0; i < ETH_ALEN; i++)
491 bssid[i] ^= sdata->dev->dev_addr[i];
492 bssid[0] &= ~0x01;
493 bssid[0] |= 0x02;
494 }
495
496 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
497 sdata->dev->name, bssid);
498
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200499 sband = local->hw.wiphy->bands[ifibss->channel->band];
Johannes Berg46900292009-02-15 12:44:28 +0100500
Johannes Berg46900292009-02-15 12:44:28 +0100501 capability = WLAN_CAPABILITY_IBSS;
502
Johannes Bergfffd0932009-07-08 14:22:54 +0200503 if (ifibss->privacy)
Johannes Berg46900292009-02-15 12:44:28 +0100504 capability |= WLAN_CAPABILITY_PRIVACY;
505 else
506 sdata->drop_unencrypted = 0;
507
Johannes Berg57c4d7b2009-04-23 16:10:04 +0200508 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
Johannes Bergb59066a2009-05-12 21:18:38 +0200509 ifibss->channel, 3, /* first two are basic */
510 capability, 0);
Johannes Berg46900292009-02-15 12:44:28 +0100511}
512
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200513static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
Johannes Berg46900292009-02-15 12:44:28 +0100514{
515 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
516 struct ieee80211_local *local = sdata->local;
517 struct ieee80211_bss *bss;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200518 struct ieee80211_channel *chan = NULL;
Johannes Berg46900292009-02-15 12:44:28 +0100519 const u8 *bssid = NULL;
520 int active_ibss;
Johannes Berge0d61882009-05-12 20:47:32 +0200521 u16 capability;
Johannes Berg46900292009-02-15 12:44:28 +0100522
Johannes Berg46900292009-02-15 12:44:28 +0100523 active_ibss = ieee80211_sta_active_ibss(sdata);
524#ifdef CONFIG_MAC80211_IBSS_DEBUG
525 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
526 sdata->dev->name, active_ibss);
527#endif /* CONFIG_MAC80211_IBSS_DEBUG */
528
529 if (active_ibss)
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200530 return;
Johannes Berg46900292009-02-15 12:44:28 +0100531
Johannes Berge0d61882009-05-12 20:47:32 +0200532 capability = WLAN_CAPABILITY_IBSS;
Johannes Bergfffd0932009-07-08 14:22:54 +0200533 if (ifibss->privacy)
Johannes Berge0d61882009-05-12 20:47:32 +0200534 capability |= WLAN_CAPABILITY_PRIVACY;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200535 if (ifibss->fixed_bssid)
Johannes Berg46900292009-02-15 12:44:28 +0100536 bssid = ifibss->bssid;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200537 if (ifibss->fixed_channel)
538 chan = ifibss->channel;
539 if (!is_zero_ether_addr(ifibss->bssid))
540 bssid = ifibss->bssid;
541 bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan, bssid,
Johannes Berg46900292009-02-15 12:44:28 +0100542 ifibss->ssid, ifibss->ssid_len,
Johannes Berge0d61882009-05-12 20:47:32 +0200543 WLAN_CAPABILITY_IBSS |
Johannes Bergdb676452009-05-20 09:05:10 +0200544 WLAN_CAPABILITY_PRIVACY,
545 capability);
Johannes Berg46900292009-02-15 12:44:28 +0100546
Reinette Chatred419b9f2009-10-19 14:55:37 -0700547 if (bss) {
Johannes Berg46900292009-02-15 12:44:28 +0100548#ifdef CONFIG_MAC80211_IBSS_DEBUG
Johannes Berg46900292009-02-15 12:44:28 +0100549 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
550 "%pM\n", bss->cbss.bssid, ifibss->bssid);
551#endif /* CONFIG_MAC80211_IBSS_DEBUG */
552
Johannes Berg46900292009-02-15 12:44:28 +0100553 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
554 " based on configured SSID\n",
555 sdata->dev->name, bss->cbss.bssid);
556
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200557 ieee80211_sta_join_ibss(sdata, bss);
Johannes Berg46900292009-02-15 12:44:28 +0100558 ieee80211_rx_bss_put(local, bss);
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200559 return;
Reinette Chatred419b9f2009-10-19 14:55:37 -0700560 }
Johannes Berg46900292009-02-15 12:44:28 +0100561
562#ifdef CONFIG_MAC80211_IBSS_DEBUG
563 printk(KERN_DEBUG " did not try to join ibss\n");
564#endif /* CONFIG_MAC80211_IBSS_DEBUG */
565
566 /* Selected IBSS not found in current scan results - try to scan */
567 if (ifibss->state == IEEE80211_IBSS_MLME_JOINED &&
568 !ieee80211_sta_active_ibss(sdata)) {
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200569 mod_timer(&ifibss->timer,
570 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
571 } else if (time_after(jiffies, ifibss->last_scan_completed +
Johannes Berg46900292009-02-15 12:44:28 +0100572 IEEE80211_SCAN_INTERVAL)) {
573 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
574 "join\n", sdata->dev->name);
575
Johannes Bergf3b85252009-04-23 16:01:47 +0200576 ieee80211_request_internal_scan(sdata, ifibss->ssid,
577 ifibss->ssid_len);
Johannes Berg46900292009-02-15 12:44:28 +0100578 } else if (ifibss->state != IEEE80211_IBSS_MLME_JOINED) {
579 int interval = IEEE80211_SCAN_INTERVAL;
580
581 if (time_after(jiffies, ifibss->ibss_join_req +
582 IEEE80211_IBSS_JOIN_TIMEOUT)) {
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200583 if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) {
584 ieee80211_sta_create_ibss(sdata);
585 return;
586 }
Johannes Berg46900292009-02-15 12:44:28 +0100587 printk(KERN_DEBUG "%s: IBSS not allowed on"
588 " %d MHz\n", sdata->dev->name,
589 local->hw.conf.channel->center_freq);
590
591 /* No IBSS found - decrease scan interval and continue
592 * scanning. */
593 interval = IEEE80211_SCAN_INTERVAL_SLOW;
594 }
595
596 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200597 mod_timer(&ifibss->timer,
598 round_jiffies(jiffies + interval));
Johannes Berg46900292009-02-15 12:44:28 +0100599 }
Johannes Berg46900292009-02-15 12:44:28 +0100600}
601
602static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
603 struct ieee80211_mgmt *mgmt,
604 size_t len)
605{
606 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
607 struct ieee80211_local *local = sdata->local;
608 int tx_last_beacon;
609 struct sk_buff *skb;
610 struct ieee80211_mgmt *resp;
611 u8 *pos, *end;
612
613 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200614 len < 24 + 2 || !ifibss->presp)
Johannes Berg46900292009-02-15 12:44:28 +0100615 return;
616
Johannes Berg24487982009-04-23 18:52:52 +0200617 tx_last_beacon = drv_tx_last_beacon(local);
Johannes Berg46900292009-02-15 12:44:28 +0100618
619#ifdef CONFIG_MAC80211_IBSS_DEBUG
620 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
621 " (tx_last_beacon=%d)\n",
622 sdata->dev->name, mgmt->sa, mgmt->da,
623 mgmt->bssid, tx_last_beacon);
624#endif /* CONFIG_MAC80211_IBSS_DEBUG */
625
626 if (!tx_last_beacon)
627 return;
628
629 if (memcmp(mgmt->bssid, ifibss->bssid, ETH_ALEN) != 0 &&
630 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
631 return;
632
633 end = ((u8 *) mgmt) + len;
634 pos = mgmt->u.probe_req.variable;
635 if (pos[0] != WLAN_EID_SSID ||
636 pos + 2 + pos[1] > end) {
637#ifdef CONFIG_MAC80211_IBSS_DEBUG
638 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
639 "from %pM\n",
640 sdata->dev->name, mgmt->sa);
641#endif
642 return;
643 }
644 if (pos[1] != 0 &&
645 (pos[1] != ifibss->ssid_len ||
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200646 !memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
Johannes Berg46900292009-02-15 12:44:28 +0100647 /* Ignore ProbeReq for foreign SSID */
648 return;
649 }
650
651 /* Reply with ProbeResp */
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200652 skb = skb_copy(ifibss->presp, GFP_KERNEL);
Johannes Berg46900292009-02-15 12:44:28 +0100653 if (!skb)
654 return;
655
656 resp = (struct ieee80211_mgmt *) skb->data;
657 memcpy(resp->da, mgmt->sa, ETH_ALEN);
658#ifdef CONFIG_MAC80211_IBSS_DEBUG
659 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
660 sdata->dev->name, resp->da);
661#endif /* CONFIG_MAC80211_IBSS_DEBUG */
Johannes Berg62ae67b2009-11-18 18:42:05 +0100662 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
663 ieee80211_tx_skb(sdata, skb);
Johannes Berg46900292009-02-15 12:44:28 +0100664}
665
666static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
667 struct ieee80211_mgmt *mgmt,
668 size_t len,
669 struct ieee80211_rx_status *rx_status)
670{
671 size_t baselen;
672 struct ieee802_11_elems elems;
673
674 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
675 return; /* ignore ProbeResp to foreign address */
676
677 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
678 if (baselen > len)
679 return;
680
681 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
682 &elems);
683
684 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
685}
686
687static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
688 struct ieee80211_mgmt *mgmt,
689 size_t len,
690 struct ieee80211_rx_status *rx_status)
691{
692 size_t baselen;
693 struct ieee802_11_elems elems;
694
695 /* Process beacon from the current BSS */
696 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
697 if (baselen > len)
698 return;
699
700 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
701
702 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
703}
704
705static void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
706 struct sk_buff *skb)
707{
708 struct ieee80211_rx_status *rx_status;
709 struct ieee80211_mgmt *mgmt;
710 u16 fc;
711
Johannes Bergf1d58c22009-06-17 13:13:00 +0200712 rx_status = IEEE80211_SKB_RXCB(skb);
Johannes Berg46900292009-02-15 12:44:28 +0100713 mgmt = (struct ieee80211_mgmt *) skb->data;
714 fc = le16_to_cpu(mgmt->frame_control);
715
716 switch (fc & IEEE80211_FCTL_STYPE) {
717 case IEEE80211_STYPE_PROBE_REQ:
718 ieee80211_rx_mgmt_probe_req(sdata, mgmt, skb->len);
719 break;
720 case IEEE80211_STYPE_PROBE_RESP:
721 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
722 rx_status);
723 break;
724 case IEEE80211_STYPE_BEACON:
725 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
726 rx_status);
727 break;
728 case IEEE80211_STYPE_AUTH:
729 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
730 break;
731 }
732
733 kfree_skb(skb);
734}
735
736static void ieee80211_ibss_work(struct work_struct *work)
737{
738 struct ieee80211_sub_if_data *sdata =
739 container_of(work, struct ieee80211_sub_if_data, u.ibss.work);
740 struct ieee80211_local *local = sdata->local;
741 struct ieee80211_if_ibss *ifibss;
742 struct sk_buff *skb;
743
Johannes Berg5bb644a2009-05-17 11:40:42 +0200744 if (WARN_ON(local->suspended))
745 return;
746
Johannes Berg46900292009-02-15 12:44:28 +0100747 if (!netif_running(sdata->dev))
748 return;
749
Helmut Schaafbe9c422009-07-23 12:14:04 +0200750 if (local->scanning)
Johannes Berg46900292009-02-15 12:44:28 +0100751 return;
752
753 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_ADHOC))
754 return;
755 ifibss = &sdata->u.ibss;
756
757 while ((skb = skb_dequeue(&ifibss->skb_queue)))
758 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
759
760 if (!test_and_clear_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request))
761 return;
762
763 switch (ifibss->state) {
764 case IEEE80211_IBSS_MLME_SEARCH:
765 ieee80211_sta_find_ibss(sdata);
766 break;
767 case IEEE80211_IBSS_MLME_JOINED:
768 ieee80211_sta_merge_ibss(sdata);
769 break;
770 default:
771 WARN_ON(1);
772 break;
773 }
774}
775
776static void ieee80211_ibss_timer(unsigned long data)
777{
778 struct ieee80211_sub_if_data *sdata =
779 (struct ieee80211_sub_if_data *) data;
780 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
781 struct ieee80211_local *local = sdata->local;
782
Johannes Berg5bb644a2009-05-17 11:40:42 +0200783 if (local->quiescing) {
784 ifibss->timer_running = true;
785 return;
786 }
787
Johannes Berg46900292009-02-15 12:44:28 +0100788 set_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request);
Luis R. Rodriguez42935ec2009-07-29 20:08:07 -0400789 ieee80211_queue_work(&local->hw, &ifibss->work);
Johannes Berg46900292009-02-15 12:44:28 +0100790}
791
Johannes Berg5bb644a2009-05-17 11:40:42 +0200792#ifdef CONFIG_PM
793void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata)
794{
795 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
796
797 cancel_work_sync(&ifibss->work);
798 if (del_timer_sync(&ifibss->timer))
799 ifibss->timer_running = true;
800}
801
802void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata)
803{
804 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
805
806 if (ifibss->timer_running) {
807 add_timer(&ifibss->timer);
808 ifibss->timer_running = false;
809 }
810}
811#endif
812
Johannes Berg46900292009-02-15 12:44:28 +0100813void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
814{
815 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
816
817 INIT_WORK(&ifibss->work, ieee80211_ibss_work);
818 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
819 (unsigned long) sdata);
820 skb_queue_head_init(&ifibss->skb_queue);
Johannes Berg46900292009-02-15 12:44:28 +0100821}
822
823/* scan finished notification */
824void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
825{
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200826 struct ieee80211_sub_if_data *sdata;
Johannes Berg46900292009-02-15 12:44:28 +0100827
Johannes Berg29b4a4f2009-04-21 00:30:49 +0200828 mutex_lock(&local->iflist_mtx);
829 list_for_each_entry(sdata, &local->interfaces, list) {
Johannes Berg0e41f712009-04-23 11:48:56 +0200830 if (!netif_running(sdata->dev))
831 continue;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200832 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
833 continue;
Johannes Berg0e41f712009-04-23 11:48:56 +0200834 if (!sdata->u.ibss.ssid_len)
835 continue;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200836 sdata->u.ibss.last_scan_completed = jiffies;
Johannes Berg51f98f12009-10-11 11:47:57 +0200837 mod_timer(&sdata->u.ibss.timer, 0);
Johannes Berg46900292009-02-15 12:44:28 +0100838 }
Johannes Berg29b4a4f2009-04-21 00:30:49 +0200839 mutex_unlock(&local->iflist_mtx);
Johannes Berg46900292009-02-15 12:44:28 +0100840}
841
842ieee80211_rx_result
Johannes Bergf1d58c22009-06-17 13:13:00 +0200843ieee80211_ibss_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
Johannes Berg46900292009-02-15 12:44:28 +0100844{
845 struct ieee80211_local *local = sdata->local;
846 struct ieee80211_mgmt *mgmt;
847 u16 fc;
848
849 if (skb->len < 24)
850 return RX_DROP_MONITOR;
851
852 mgmt = (struct ieee80211_mgmt *) skb->data;
853 fc = le16_to_cpu(mgmt->frame_control);
854
855 switch (fc & IEEE80211_FCTL_STYPE) {
856 case IEEE80211_STYPE_PROBE_RESP:
857 case IEEE80211_STYPE_BEACON:
Johannes Berg46900292009-02-15 12:44:28 +0100858 case IEEE80211_STYPE_PROBE_REQ:
859 case IEEE80211_STYPE_AUTH:
860 skb_queue_tail(&sdata->u.ibss.skb_queue, skb);
Luis R. Rodriguez42935ec2009-07-29 20:08:07 -0400861 ieee80211_queue_work(&local->hw, &sdata->u.ibss.work);
Johannes Berg46900292009-02-15 12:44:28 +0100862 return RX_QUEUED;
863 }
864
865 return RX_DROP_MONITOR;
866}
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200867
868int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
869 struct cfg80211_ibss_params *params)
870{
871 struct sk_buff *skb;
872
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200873 if (params->bssid) {
874 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
875 sdata->u.ibss.fixed_bssid = true;
876 } else
877 sdata->u.ibss.fixed_bssid = false;
878
Johannes Bergfffd0932009-07-08 14:22:54 +0200879 sdata->u.ibss.privacy = params->privacy;
880
Johannes Berg57c4d7b2009-04-23 16:10:04 +0200881 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
882
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200883 sdata->u.ibss.channel = params->channel;
884 sdata->u.ibss.fixed_channel = params->channel_fixed;
885
886 if (params->ie) {
887 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
888 GFP_KERNEL);
889 if (sdata->u.ibss.ie)
890 sdata->u.ibss.ie_len = params->ie_len;
891 }
892
893 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom +
894 36 /* bitrates */ +
895 34 /* SSID */ +
896 3 /* DS params */ +
897 4 /* IBSS params */ +
898 params->ie_len);
899 if (!skb)
900 return -ENOMEM;
901
902 sdata->u.ibss.skb = skb;
903 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
904 sdata->u.ibss.ibss_join_req = jiffies;
905
Johannes Berg0e41f712009-04-23 11:48:56 +0200906 memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN);
907
908 /*
909 * The ssid_len setting below is used to see whether
910 * we are active, and we need all other settings
911 * before that may get visible.
912 */
913 mb();
914
915 sdata->u.ibss.ssid_len = params->ssid_len;
916
Johannes Berg5cff20e2009-04-29 12:26:17 +0200917 ieee80211_recalc_idle(sdata->local);
918
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200919 set_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
Luis R. Rodriguez42935ec2009-07-29 20:08:07 -0400920 ieee80211_queue_work(&sdata->local->hw, &sdata->u.ibss.work);
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200921
922 return 0;
923}
924
925int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
926{
927 struct sk_buff *skb;
928
929 del_timer_sync(&sdata->u.ibss.timer);
930 clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
931 cancel_work_sync(&sdata->u.ibss.work);
932 clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
933
934 sta_info_flush(sdata->local, sdata);
935
936 /* remove beacon */
937 kfree(sdata->u.ibss.ie);
938 skb = sdata->u.ibss.presp;
939 rcu_assign_pointer(sdata->u.ibss.presp, NULL);
Johannes Berg2d0ddec2009-04-23 16:13:26 +0200940 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200941 synchronize_rcu();
942 kfree_skb(skb);
943
944 skb_queue_purge(&sdata->u.ibss.skb_queue);
945 memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
Johannes Berg5cff20e2009-04-29 12:26:17 +0200946 sdata->u.ibss.ssid_len = 0;
947
948 ieee80211_recalc_idle(sdata->local);
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200949
950 return 0;
951}