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Commit | Line | Data |
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46900298 JB |
1 | /* |
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> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
46900298 JB |
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> | |
24 | ||
25 | #include "ieee80211_i.h" | |
24487981 | 26 | #include "driver-ops.h" |
46900298 JB |
27 | #include "rate.h" |
28 | ||
29 | #define IEEE80211_SCAN_INTERVAL (2 * HZ) | |
30 | #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ) | |
31 | #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ) | |
32 | ||
33 | #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ) | |
4a332a38 | 34 | #define IEEE80211_IBSS_MERGE_DELAY 0x400000 |
46900298 JB |
35 | #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ) |
36 | ||
37 | #define IEEE80211_IBSS_MAX_STA_ENTRIES 128 | |
38 | ||
39 | ||
40 | static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, | |
41 | struct ieee80211_mgmt *mgmt, | |
42 | size_t len) | |
43 | { | |
44 | u16 auth_alg, auth_transaction, status_code; | |
45 | ||
46 | if (len < 24 + 6) | |
47 | return; | |
48 | ||
49 | auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); | |
50 | auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); | |
51 | status_code = le16_to_cpu(mgmt->u.auth.status_code); | |
52 | ||
53 | /* | |
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. | |
58 | */ | |
59 | if (auth_alg == WLAN_AUTH_OPEN && auth_transaction == 1) | |
60 | ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, NULL, 0, | |
fffd0934 | 61 | sdata->u.ibss.bssid, NULL, 0, 0); |
46900298 JB |
62 | } |
63 | ||
af8cdcd8 JB |
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, | |
b59066a2 | 67 | const u32 basic_rates, |
af8cdcd8 | 68 | const u16 capability, u64 tsf) |
46900298 JB |
69 | { |
70 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
71 | struct ieee80211_local *local = sdata->local; | |
b59066a2 | 72 | int rates, i; |
46900298 JB |
73 | struct sk_buff *skb; |
74 | struct ieee80211_mgmt *mgmt; | |
75 | u8 *pos; | |
76 | struct ieee80211_supported_band *sband; | |
f446d10f | 77 | struct cfg80211_bss *bss; |
57c4d7b4 | 78 | u32 bss_change; |
b59066a2 | 79 | u8 supp_rates[IEEE80211_MAX_SUPP_RATES]; |
24487981 JB |
80 | |
81 | /* Reset own TSF to allow time synchronization work. */ | |
82 | drv_reset_tsf(local); | |
46900298 | 83 | |
af8cdcd8 JB |
84 | skb = ifibss->skb; |
85 | rcu_assign_pointer(ifibss->presp, NULL); | |
86 | synchronize_rcu(); | |
87 | skb->data = skb->head; | |
88 | skb->len = 0; | |
89 | skb_reset_tail_pointer(skb); | |
90 | skb_reserve(skb, sdata->local->hw.extra_tx_headroom); | |
46900298 | 91 | |
af8cdcd8 JB |
92 | if (memcmp(ifibss->bssid, bssid, ETH_ALEN)) |
93 | sta_info_flush(sdata->local, sdata); | |
46900298 JB |
94 | |
95 | memcpy(ifibss->bssid, bssid, ETH_ALEN); | |
46900298 | 96 | |
af8cdcd8 | 97 | sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0; |
46900298 | 98 | |
af8cdcd8 JB |
99 | local->oper_channel = chan; |
100 | local->oper_channel_type = NL80211_CHAN_NO_HT; | |
101 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); | |
57c4d7b4 | 102 | |
af8cdcd8 | 103 | sband = local->hw.wiphy->bands[chan->band]; |
46900298 | 104 | |
b59066a2 JB |
105 | /* build supported rates array */ |
106 | pos = supp_rates; | |
107 | for (i = 0; i < sband->n_bitrates; i++) { | |
108 | int rate = sband->bitrates[i].bitrate; | |
109 | u8 basic = 0; | |
110 | if (basic_rates & BIT(i)) | |
111 | basic = 0x80; | |
112 | *pos++ = basic | (u8) (rate / 5); | |
113 | } | |
114 | ||
46900298 | 115 | /* Build IBSS probe response */ |
af8cdcd8 | 116 | mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon)); |
46900298 JB |
117 | memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon)); |
118 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | | |
119 | IEEE80211_STYPE_PROBE_RESP); | |
120 | memset(mgmt->da, 0xff, ETH_ALEN); | |
47846c9b | 121 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
46900298 | 122 | memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN); |
57c4d7b4 | 123 | mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int); |
707c1b4e | 124 | mgmt->u.beacon.timestamp = cpu_to_le64(tsf); |
46900298 JB |
125 | mgmt->u.beacon.capab_info = cpu_to_le16(capability); |
126 | ||
127 | pos = skb_put(skb, 2 + ifibss->ssid_len); | |
128 | *pos++ = WLAN_EID_SSID; | |
129 | *pos++ = ifibss->ssid_len; | |
130 | memcpy(pos, ifibss->ssid, ifibss->ssid_len); | |
131 | ||
b59066a2 | 132 | rates = sband->n_bitrates; |
46900298 JB |
133 | if (rates > 8) |
134 | rates = 8; | |
135 | pos = skb_put(skb, 2 + rates); | |
136 | *pos++ = WLAN_EID_SUPP_RATES; | |
137 | *pos++ = rates; | |
138 | memcpy(pos, supp_rates, rates); | |
139 | ||
140 | if (sband->band == IEEE80211_BAND_2GHZ) { | |
141 | pos = skb_put(skb, 2 + 1); | |
142 | *pos++ = WLAN_EID_DS_PARAMS; | |
143 | *pos++ = 1; | |
af8cdcd8 | 144 | *pos++ = ieee80211_frequency_to_channel(chan->center_freq); |
46900298 JB |
145 | } |
146 | ||
147 | pos = skb_put(skb, 2 + 2); | |
148 | *pos++ = WLAN_EID_IBSS_PARAMS; | |
149 | *pos++ = 2; | |
150 | /* FIX: set ATIM window based on scan results */ | |
151 | *pos++ = 0; | |
152 | *pos++ = 0; | |
153 | ||
b59066a2 JB |
154 | if (sband->n_bitrates > 8) { |
155 | rates = sband->n_bitrates - 8; | |
46900298 JB |
156 | pos = skb_put(skb, 2 + rates); |
157 | *pos++ = WLAN_EID_EXT_SUPP_RATES; | |
158 | *pos++ = rates; | |
159 | memcpy(pos, &supp_rates[8], rates); | |
160 | } | |
161 | ||
af8cdcd8 JB |
162 | if (ifibss->ie_len) |
163 | memcpy(skb_put(skb, ifibss->ie_len), | |
164 | ifibss->ie, ifibss->ie_len); | |
165 | ||
166 | rcu_assign_pointer(ifibss->presp, skb); | |
46900298 | 167 | |
2d0ddec5 JB |
168 | sdata->vif.bss_conf.beacon_int = beacon_int; |
169 | bss_change = BSS_CHANGED_BEACON_INT; | |
170 | bss_change |= ieee80211_reset_erp_info(sdata); | |
171 | bss_change |= BSS_CHANGED_BSSID; | |
172 | bss_change |= BSS_CHANGED_BEACON; | |
173 | bss_change |= BSS_CHANGED_BEACON_ENABLED; | |
174 | ieee80211_bss_info_change_notify(sdata, bss_change); | |
46900298 | 175 | |
b59066a2 | 176 | ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates); |
46900298 | 177 | |
46900298 | 178 | ifibss->state = IEEE80211_IBSS_MLME_JOINED; |
af8cdcd8 JB |
179 | mod_timer(&ifibss->timer, |
180 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 | 181 | |
f446d10f JB |
182 | bss = cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel, |
183 | mgmt, skb->len, 0, GFP_KERNEL); | |
184 | cfg80211_put_bss(bss); | |
af8cdcd8 | 185 | cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL); |
46900298 JB |
186 | } |
187 | ||
af8cdcd8 JB |
188 | static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
189 | struct ieee80211_bss *bss) | |
46900298 | 190 | { |
0c1ad2ca JB |
191 | struct cfg80211_bss *cbss = |
192 | container_of((void *)bss, struct cfg80211_bss, priv); | |
b59066a2 JB |
193 | struct ieee80211_supported_band *sband; |
194 | u32 basic_rates; | |
195 | int i, j; | |
0c1ad2ca | 196 | u16 beacon_int = cbss->beacon_interval; |
57c4d7b4 JB |
197 | |
198 | if (beacon_int < 10) | |
199 | beacon_int = 10; | |
200 | ||
0c1ad2ca | 201 | sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; |
b59066a2 JB |
202 | |
203 | basic_rates = 0; | |
204 | ||
205 | for (i = 0; i < bss->supp_rates_len; i++) { | |
206 | int rate = (bss->supp_rates[i] & 0x7f) * 5; | |
207 | bool is_basic = !!(bss->supp_rates[i] & 0x80); | |
208 | ||
209 | for (j = 0; j < sband->n_bitrates; j++) { | |
210 | if (sband->bitrates[j].bitrate == rate) { | |
211 | if (is_basic) | |
212 | basic_rates |= BIT(j); | |
213 | break; | |
214 | } | |
215 | } | |
216 | } | |
217 | ||
0c1ad2ca | 218 | __ieee80211_sta_join_ibss(sdata, cbss->bssid, |
57c4d7b4 | 219 | beacon_int, |
0c1ad2ca | 220 | cbss->channel, |
b59066a2 | 221 | basic_rates, |
0c1ad2ca JB |
222 | cbss->capability, |
223 | cbss->tsf); | |
46900298 JB |
224 | } |
225 | ||
226 | static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, | |
227 | struct ieee80211_mgmt *mgmt, | |
228 | size_t len, | |
229 | struct ieee80211_rx_status *rx_status, | |
230 | struct ieee802_11_elems *elems, | |
231 | bool beacon) | |
232 | { | |
233 | struct ieee80211_local *local = sdata->local; | |
234 | int freq; | |
0c1ad2ca | 235 | struct cfg80211_bss *cbss; |
46900298 JB |
236 | struct ieee80211_bss *bss; |
237 | struct sta_info *sta; | |
238 | struct ieee80211_channel *channel; | |
239 | u64 beacon_timestamp, rx_timestamp; | |
240 | u32 supp_rates = 0; | |
241 | enum ieee80211_band band = rx_status->band; | |
242 | ||
243 | if (elems->ds_params && elems->ds_params_len == 1) | |
244 | freq = ieee80211_channel_to_frequency(elems->ds_params[0]); | |
245 | else | |
246 | freq = rx_status->freq; | |
247 | ||
248 | channel = ieee80211_get_channel(local->hw.wiphy, freq); | |
249 | ||
250 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
251 | return; | |
252 | ||
253 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates && | |
254 | memcmp(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) { | |
255 | supp_rates = ieee80211_sta_get_rates(local, elems, band); | |
256 | ||
257 | rcu_read_lock(); | |
258 | ||
abe60632 | 259 | sta = sta_info_get(sdata, mgmt->sa); |
46900298 JB |
260 | if (sta) { |
261 | u32 prev_rates; | |
262 | ||
263 | prev_rates = sta->sta.supp_rates[band]; | |
264 | /* make sure mandatory rates are always added */ | |
265 | sta->sta.supp_rates[band] = supp_rates | | |
266 | ieee80211_mandatory_rates(local, band); | |
267 | ||
268 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
269 | if (sta->sta.supp_rates[band] != prev_rates) | |
270 | printk(KERN_DEBUG "%s: updated supp_rates set " | |
271 | "for %pM based on beacon info (0x%llx | " | |
272 | "0x%llx -> 0x%llx)\n", | |
47846c9b | 273 | sdata->name, |
46900298 JB |
274 | sta->sta.addr, |
275 | (unsigned long long) prev_rates, | |
276 | (unsigned long long) supp_rates, | |
277 | (unsigned long long) sta->sta.supp_rates[band]); | |
278 | #endif | |
34e89507 JB |
279 | rcu_read_unlock(); |
280 | } else { | |
281 | rcu_read_unlock(); | |
282 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, | |
283 | supp_rates, GFP_KERNEL); | |
284 | } | |
46900298 JB |
285 | } |
286 | ||
287 | bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, | |
288 | channel, beacon); | |
289 | if (!bss) | |
290 | return; | |
291 | ||
0c1ad2ca JB |
292 | cbss = container_of((void *)bss, struct cfg80211_bss, priv); |
293 | ||
46900298 | 294 | /* was just updated in ieee80211_bss_info_update */ |
0c1ad2ca | 295 | beacon_timestamp = cbss->tsf; |
46900298 JB |
296 | |
297 | /* check if we need to merge IBSS */ | |
298 | ||
46900298 | 299 | /* we use a fixed BSSID */ |
a98bfec2 | 300 | if (sdata->u.ibss.fixed_bssid) |
46900298 JB |
301 | goto put_bss; |
302 | ||
303 | /* not an IBSS */ | |
0c1ad2ca | 304 | if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) |
46900298 JB |
305 | goto put_bss; |
306 | ||
307 | /* different channel */ | |
0c1ad2ca | 308 | if (cbss->channel != local->oper_channel) |
46900298 JB |
309 | goto put_bss; |
310 | ||
311 | /* different SSID */ | |
312 | if (elems->ssid_len != sdata->u.ibss.ssid_len || | |
313 | memcmp(elems->ssid, sdata->u.ibss.ssid, | |
314 | sdata->u.ibss.ssid_len)) | |
315 | goto put_bss; | |
316 | ||
34e8f082 | 317 | /* same BSSID */ |
0c1ad2ca | 318 | if (memcmp(cbss->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) |
34e8f082 AF |
319 | goto put_bss; |
320 | ||
46900298 JB |
321 | if (rx_status->flag & RX_FLAG_TSFT) { |
322 | /* | |
323 | * For correct IBSS merging we need mactime; since mactime is | |
324 | * defined as the time the first data symbol of the frame hits | |
325 | * the PHY, and the timestamp of the beacon is defined as "the | |
326 | * time that the data symbol containing the first bit of the | |
327 | * timestamp is transmitted to the PHY plus the transmitting | |
328 | * STA's delays through its local PHY from the MAC-PHY | |
329 | * interface to its interface with the WM" (802.11 11.1.2) | |
330 | * - equals the time this bit arrives at the receiver - we have | |
331 | * to take into account the offset between the two. | |
332 | * | |
333 | * E.g. at 1 MBit that means mactime is 192 usec earlier | |
334 | * (=24 bytes * 8 usecs/byte) than the beacon timestamp. | |
335 | */ | |
336 | int rate; | |
337 | ||
338 | if (rx_status->flag & RX_FLAG_HT) | |
339 | rate = 65; /* TODO: HT rates */ | |
340 | else | |
341 | rate = local->hw.wiphy->bands[band]-> | |
342 | bitrates[rx_status->rate_idx].bitrate; | |
343 | ||
344 | rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate); | |
24487981 JB |
345 | } else { |
346 | /* | |
347 | * second best option: get current TSF | |
348 | * (will return -1 if not supported) | |
349 | */ | |
350 | rx_timestamp = drv_get_tsf(local); | |
351 | } | |
46900298 JB |
352 | |
353 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
354 | printk(KERN_DEBUG "RX beacon SA=%pM BSSID=" | |
355 | "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", | |
356 | mgmt->sa, mgmt->bssid, | |
357 | (unsigned long long)rx_timestamp, | |
358 | (unsigned long long)beacon_timestamp, | |
359 | (unsigned long long)(rx_timestamp - beacon_timestamp), | |
360 | jiffies); | |
361 | #endif | |
362 | ||
4a332a38 AF |
363 | /* give slow hardware some time to do the TSF sync */ |
364 | if (rx_timestamp < IEEE80211_IBSS_MERGE_DELAY) | |
365 | goto put_bss; | |
366 | ||
46900298 JB |
367 | if (beacon_timestamp > rx_timestamp) { |
368 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
369 | printk(KERN_DEBUG "%s: beacon TSF higher than " | |
370 | "local TSF - IBSS merge with BSSID %pM\n", | |
47846c9b | 371 | sdata->name, mgmt->bssid); |
46900298 JB |
372 | #endif |
373 | ieee80211_sta_join_ibss(sdata, bss); | |
34e89507 JB |
374 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, |
375 | supp_rates, GFP_KERNEL); | |
46900298 JB |
376 | } |
377 | ||
378 | put_bss: | |
379 | ieee80211_rx_bss_put(local, bss); | |
380 | } | |
381 | ||
382 | /* | |
383 | * Add a new IBSS station, will also be called by the RX code when, | |
384 | * in IBSS mode, receiving a frame from a yet-unknown station, hence | |
385 | * must be callable in atomic context. | |
386 | */ | |
387 | struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, | |
34e89507 JB |
388 | u8 *bssid,u8 *addr, u32 supp_rates, |
389 | gfp_t gfp) | |
46900298 | 390 | { |
2e10d330 | 391 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
46900298 JB |
392 | struct ieee80211_local *local = sdata->local; |
393 | struct sta_info *sta; | |
394 | int band = local->hw.conf.channel->band; | |
395 | ||
af8cdcd8 JB |
396 | /* |
397 | * XXX: Consider removing the least recently used entry and | |
398 | * allow new one to be added. | |
399 | */ | |
46900298 | 400 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { |
af8cdcd8 JB |
401 | if (net_ratelimit()) |
402 | printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n", | |
47846c9b | 403 | sdata->name, addr); |
46900298 JB |
404 | return NULL; |
405 | } | |
406 | ||
2e10d330 FF |
407 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) |
408 | return NULL; | |
409 | ||
46900298 JB |
410 | if (compare_ether_addr(bssid, sdata->u.ibss.bssid)) |
411 | return NULL; | |
412 | ||
413 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
414 | printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n", | |
47846c9b | 415 | wiphy_name(local->hw.wiphy), addr, sdata->name); |
46900298 JB |
416 | #endif |
417 | ||
34e89507 | 418 | sta = sta_info_alloc(sdata, addr, gfp); |
46900298 JB |
419 | if (!sta) |
420 | return NULL; | |
421 | ||
422 | set_sta_flags(sta, WLAN_STA_AUTHORIZED); | |
423 | ||
424 | /* make sure mandatory rates are always added */ | |
425 | sta->sta.supp_rates[band] = supp_rates | | |
426 | ieee80211_mandatory_rates(local, band); | |
427 | ||
428 | rate_control_rate_init(sta); | |
429 | ||
34e89507 | 430 | /* If it fails, maybe we raced another insertion? */ |
46900298 | 431 | if (sta_info_insert(sta)) |
34e89507 | 432 | return sta_info_get(sdata, addr); |
46900298 JB |
433 | return sta; |
434 | } | |
435 | ||
436 | static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) | |
437 | { | |
438 | struct ieee80211_local *local = sdata->local; | |
439 | int active = 0; | |
440 | struct sta_info *sta; | |
441 | ||
442 | rcu_read_lock(); | |
443 | ||
444 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
445 | if (sta->sdata == sdata && | |
446 | time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL, | |
447 | jiffies)) { | |
448 | active++; | |
449 | break; | |
450 | } | |
451 | } | |
452 | ||
453 | rcu_read_unlock(); | |
454 | ||
455 | return active; | |
456 | } | |
457 | ||
ce9058ae BP |
458 | /* |
459 | * This function is called with state == IEEE80211_IBSS_MLME_JOINED | |
460 | */ | |
46900298 JB |
461 | |
462 | static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) | |
463 | { | |
464 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
465 | ||
af8cdcd8 JB |
466 | mod_timer(&ifibss->timer, |
467 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 JB |
468 | |
469 | ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT); | |
af8cdcd8 | 470 | |
450aae3d S |
471 | if (time_before(jiffies, ifibss->last_scan_completed + |
472 | IEEE80211_IBSS_MERGE_INTERVAL)) | |
473 | return; | |
474 | ||
46900298 JB |
475 | if (ieee80211_sta_active_ibss(sdata)) |
476 | return; | |
477 | ||
af8cdcd8 | 478 | if (ifibss->fixed_channel) |
46900298 JB |
479 | return; |
480 | ||
481 | printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other " | |
47846c9b | 482 | "IBSS networks with same SSID (merge)\n", sdata->name); |
46900298 | 483 | |
f3b85252 | 484 | ieee80211_request_internal_scan(sdata, ifibss->ssid, ifibss->ssid_len); |
46900298 JB |
485 | } |
486 | ||
af8cdcd8 | 487 | static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
488 | { |
489 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
490 | struct ieee80211_local *local = sdata->local; | |
491 | struct ieee80211_supported_band *sband; | |
46900298 | 492 | u8 bssid[ETH_ALEN]; |
46900298 JB |
493 | u16 capability; |
494 | int i; | |
495 | ||
af8cdcd8 | 496 | if (ifibss->fixed_bssid) { |
46900298 JB |
497 | memcpy(bssid, ifibss->bssid, ETH_ALEN); |
498 | } else { | |
499 | /* Generate random, not broadcast, locally administered BSSID. Mix in | |
500 | * own MAC address to make sure that devices that do not have proper | |
501 | * random number generator get different BSSID. */ | |
502 | get_random_bytes(bssid, ETH_ALEN); | |
503 | for (i = 0; i < ETH_ALEN; i++) | |
47846c9b | 504 | bssid[i] ^= sdata->vif.addr[i]; |
46900298 JB |
505 | bssid[0] &= ~0x01; |
506 | bssid[0] |= 0x02; | |
507 | } | |
508 | ||
509 | printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n", | |
47846c9b | 510 | sdata->name, bssid); |
46900298 | 511 | |
af8cdcd8 | 512 | sband = local->hw.wiphy->bands[ifibss->channel->band]; |
46900298 | 513 | |
46900298 JB |
514 | capability = WLAN_CAPABILITY_IBSS; |
515 | ||
fffd0934 | 516 | if (ifibss->privacy) |
46900298 JB |
517 | capability |= WLAN_CAPABILITY_PRIVACY; |
518 | else | |
519 | sdata->drop_unencrypted = 0; | |
520 | ||
57c4d7b4 | 521 | __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, |
b59066a2 JB |
522 | ifibss->channel, 3, /* first two are basic */ |
523 | capability, 0); | |
46900298 JB |
524 | } |
525 | ||
ce9058ae BP |
526 | /* |
527 | * This function is called with state == IEEE80211_IBSS_MLME_SEARCH | |
528 | */ | |
529 | ||
af8cdcd8 | 530 | static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
531 | { |
532 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
533 | struct ieee80211_local *local = sdata->local; | |
0c1ad2ca | 534 | struct cfg80211_bss *cbss; |
af8cdcd8 | 535 | struct ieee80211_channel *chan = NULL; |
46900298 JB |
536 | const u8 *bssid = NULL; |
537 | int active_ibss; | |
e0d61887 | 538 | u16 capability; |
46900298 | 539 | |
46900298 JB |
540 | active_ibss = ieee80211_sta_active_ibss(sdata); |
541 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
542 | printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n", | |
47846c9b | 543 | sdata->name, active_ibss); |
46900298 JB |
544 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
545 | ||
546 | if (active_ibss) | |
af8cdcd8 | 547 | return; |
46900298 | 548 | |
e0d61887 | 549 | capability = WLAN_CAPABILITY_IBSS; |
fffd0934 | 550 | if (ifibss->privacy) |
e0d61887 | 551 | capability |= WLAN_CAPABILITY_PRIVACY; |
af8cdcd8 JB |
552 | if (ifibss->fixed_bssid) |
553 | bssid = ifibss->bssid; | |
554 | if (ifibss->fixed_channel) | |
555 | chan = ifibss->channel; | |
556 | if (!is_zero_ether_addr(ifibss->bssid)) | |
46900298 | 557 | bssid = ifibss->bssid; |
0c1ad2ca JB |
558 | cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, |
559 | ifibss->ssid, ifibss->ssid_len, | |
560 | WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY, | |
561 | capability); | |
562 | ||
563 | if (cbss) { | |
564 | struct ieee80211_bss *bss; | |
46900298 | 565 | |
0c1ad2ca | 566 | bss = (void *)cbss->priv; |
46900298 | 567 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
46900298 | 568 | printk(KERN_DEBUG " sta_find_ibss: selected %pM current " |
0c1ad2ca | 569 | "%pM\n", cbss->bssid, ifibss->bssid); |
46900298 JB |
570 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
571 | ||
46900298 JB |
572 | printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM" |
573 | " based on configured SSID\n", | |
0c1ad2ca | 574 | sdata->name, cbss->bssid); |
46900298 | 575 | |
af8cdcd8 | 576 | ieee80211_sta_join_ibss(sdata, bss); |
46900298 | 577 | ieee80211_rx_bss_put(local, bss); |
af8cdcd8 | 578 | return; |
d419b9f0 | 579 | } |
46900298 JB |
580 | |
581 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
582 | printk(KERN_DEBUG " did not try to join ibss\n"); | |
583 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ | |
584 | ||
585 | /* Selected IBSS not found in current scan results - try to scan */ | |
ce9058ae | 586 | if (time_after(jiffies, ifibss->last_scan_completed + |
46900298 JB |
587 | IEEE80211_SCAN_INTERVAL)) { |
588 | printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to " | |
47846c9b | 589 | "join\n", sdata->name); |
46900298 | 590 | |
f3b85252 JB |
591 | ieee80211_request_internal_scan(sdata, ifibss->ssid, |
592 | ifibss->ssid_len); | |
ce9058ae | 593 | } else { |
46900298 JB |
594 | int interval = IEEE80211_SCAN_INTERVAL; |
595 | ||
596 | if (time_after(jiffies, ifibss->ibss_join_req + | |
597 | IEEE80211_IBSS_JOIN_TIMEOUT)) { | |
af8cdcd8 JB |
598 | if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) { |
599 | ieee80211_sta_create_ibss(sdata); | |
600 | return; | |
601 | } | |
46900298 | 602 | printk(KERN_DEBUG "%s: IBSS not allowed on" |
47846c9b | 603 | " %d MHz\n", sdata->name, |
46900298 JB |
604 | local->hw.conf.channel->center_freq); |
605 | ||
606 | /* No IBSS found - decrease scan interval and continue | |
607 | * scanning. */ | |
608 | interval = IEEE80211_SCAN_INTERVAL_SLOW; | |
609 | } | |
610 | ||
af8cdcd8 JB |
611 | mod_timer(&ifibss->timer, |
612 | round_jiffies(jiffies + interval)); | |
46900298 | 613 | } |
46900298 JB |
614 | } |
615 | ||
616 | static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, | |
617 | struct ieee80211_mgmt *mgmt, | |
618 | size_t len) | |
619 | { | |
620 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
621 | struct ieee80211_local *local = sdata->local; | |
622 | int tx_last_beacon; | |
623 | struct sk_buff *skb; | |
624 | struct ieee80211_mgmt *resp; | |
625 | u8 *pos, *end; | |
626 | ||
627 | if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || | |
af8cdcd8 | 628 | len < 24 + 2 || !ifibss->presp) |
46900298 JB |
629 | return; |
630 | ||
24487981 | 631 | tx_last_beacon = drv_tx_last_beacon(local); |
46900298 JB |
632 | |
633 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
634 | printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM" | |
635 | " (tx_last_beacon=%d)\n", | |
47846c9b | 636 | sdata->name, mgmt->sa, mgmt->da, |
46900298 JB |
637 | mgmt->bssid, tx_last_beacon); |
638 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ | |
639 | ||
640 | if (!tx_last_beacon) | |
641 | return; | |
642 | ||
643 | if (memcmp(mgmt->bssid, ifibss->bssid, ETH_ALEN) != 0 && | |
644 | memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0) | |
645 | return; | |
646 | ||
647 | end = ((u8 *) mgmt) + len; | |
648 | pos = mgmt->u.probe_req.variable; | |
649 | if (pos[0] != WLAN_EID_SSID || | |
650 | pos + 2 + pos[1] > end) { | |
651 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
652 | printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq " | |
653 | "from %pM\n", | |
47846c9b | 654 | sdata->name, mgmt->sa); |
46900298 JB |
655 | #endif |
656 | return; | |
657 | } | |
658 | if (pos[1] != 0 && | |
659 | (pos[1] != ifibss->ssid_len || | |
0da780c2 | 660 | memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { |
46900298 JB |
661 | /* Ignore ProbeReq for foreign SSID */ |
662 | return; | |
663 | } | |
664 | ||
665 | /* Reply with ProbeResp */ | |
af8cdcd8 | 666 | skb = skb_copy(ifibss->presp, GFP_KERNEL); |
46900298 JB |
667 | if (!skb) |
668 | return; | |
669 | ||
670 | resp = (struct ieee80211_mgmt *) skb->data; | |
671 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
672 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
673 | printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n", | |
47846c9b | 674 | sdata->name, resp->da); |
46900298 | 675 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
62ae67be JB |
676 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
677 | ieee80211_tx_skb(sdata, skb); | |
46900298 JB |
678 | } |
679 | ||
680 | static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, | |
681 | struct ieee80211_mgmt *mgmt, | |
682 | size_t len, | |
683 | struct ieee80211_rx_status *rx_status) | |
684 | { | |
685 | size_t baselen; | |
686 | struct ieee802_11_elems elems; | |
687 | ||
47846c9b | 688 | if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN)) |
46900298 JB |
689 | return; /* ignore ProbeResp to foreign address */ |
690 | ||
691 | baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; | |
692 | if (baselen > len) | |
693 | return; | |
694 | ||
695 | ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, | |
696 | &elems); | |
697 | ||
698 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); | |
699 | } | |
700 | ||
701 | static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, | |
702 | struct ieee80211_mgmt *mgmt, | |
703 | size_t len, | |
704 | struct ieee80211_rx_status *rx_status) | |
705 | { | |
706 | size_t baselen; | |
707 | struct ieee802_11_elems elems; | |
708 | ||
709 | /* Process beacon from the current BSS */ | |
710 | baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; | |
711 | if (baselen > len) | |
712 | return; | |
713 | ||
714 | ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems); | |
715 | ||
716 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true); | |
717 | } | |
718 | ||
719 | static void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, | |
720 | struct sk_buff *skb) | |
721 | { | |
722 | struct ieee80211_rx_status *rx_status; | |
723 | struct ieee80211_mgmt *mgmt; | |
724 | u16 fc; | |
725 | ||
f1d58c25 | 726 | rx_status = IEEE80211_SKB_RXCB(skb); |
46900298 JB |
727 | mgmt = (struct ieee80211_mgmt *) skb->data; |
728 | fc = le16_to_cpu(mgmt->frame_control); | |
729 | ||
730 | switch (fc & IEEE80211_FCTL_STYPE) { | |
731 | case IEEE80211_STYPE_PROBE_REQ: | |
732 | ieee80211_rx_mgmt_probe_req(sdata, mgmt, skb->len); | |
733 | break; | |
734 | case IEEE80211_STYPE_PROBE_RESP: | |
735 | ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, | |
736 | rx_status); | |
737 | break; | |
738 | case IEEE80211_STYPE_BEACON: | |
739 | ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, | |
740 | rx_status); | |
741 | break; | |
742 | case IEEE80211_STYPE_AUTH: | |
743 | ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); | |
744 | break; | |
745 | } | |
746 | ||
747 | kfree_skb(skb); | |
748 | } | |
749 | ||
750 | static void ieee80211_ibss_work(struct work_struct *work) | |
751 | { | |
752 | struct ieee80211_sub_if_data *sdata = | |
753 | container_of(work, struct ieee80211_sub_if_data, u.ibss.work); | |
754 | struct ieee80211_local *local = sdata->local; | |
755 | struct ieee80211_if_ibss *ifibss; | |
756 | struct sk_buff *skb; | |
757 | ||
5bb644a0 JB |
758 | if (WARN_ON(local->suspended)) |
759 | return; | |
760 | ||
9607e6b6 | 761 | if (!ieee80211_sdata_running(sdata)) |
46900298 JB |
762 | return; |
763 | ||
fbe9c429 | 764 | if (local->scanning) |
46900298 JB |
765 | return; |
766 | ||
767 | if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_ADHOC)) | |
768 | return; | |
769 | ifibss = &sdata->u.ibss; | |
770 | ||
771 | while ((skb = skb_dequeue(&ifibss->skb_queue))) | |
772 | ieee80211_ibss_rx_queued_mgmt(sdata, skb); | |
773 | ||
774 | if (!test_and_clear_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request)) | |
775 | return; | |
776 | ||
777 | switch (ifibss->state) { | |
778 | case IEEE80211_IBSS_MLME_SEARCH: | |
779 | ieee80211_sta_find_ibss(sdata); | |
780 | break; | |
781 | case IEEE80211_IBSS_MLME_JOINED: | |
782 | ieee80211_sta_merge_ibss(sdata); | |
783 | break; | |
784 | default: | |
785 | WARN_ON(1); | |
786 | break; | |
787 | } | |
788 | } | |
789 | ||
790 | static void ieee80211_ibss_timer(unsigned long data) | |
791 | { | |
792 | struct ieee80211_sub_if_data *sdata = | |
793 | (struct ieee80211_sub_if_data *) data; | |
794 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
795 | struct ieee80211_local *local = sdata->local; | |
796 | ||
5bb644a0 JB |
797 | if (local->quiescing) { |
798 | ifibss->timer_running = true; | |
799 | return; | |
800 | } | |
801 | ||
46900298 | 802 | set_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request); |
42935eca | 803 | ieee80211_queue_work(&local->hw, &ifibss->work); |
46900298 JB |
804 | } |
805 | ||
5bb644a0 JB |
806 | #ifdef CONFIG_PM |
807 | void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata) | |
808 | { | |
809 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
810 | ||
811 | cancel_work_sync(&ifibss->work); | |
812 | if (del_timer_sync(&ifibss->timer)) | |
813 | ifibss->timer_running = true; | |
814 | } | |
815 | ||
816 | void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata) | |
817 | { | |
818 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
819 | ||
820 | if (ifibss->timer_running) { | |
821 | add_timer(&ifibss->timer); | |
822 | ifibss->timer_running = false; | |
823 | } | |
824 | } | |
825 | #endif | |
826 | ||
46900298 JB |
827 | void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) |
828 | { | |
829 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
830 | ||
831 | INIT_WORK(&ifibss->work, ieee80211_ibss_work); | |
832 | setup_timer(&ifibss->timer, ieee80211_ibss_timer, | |
833 | (unsigned long) sdata); | |
834 | skb_queue_head_init(&ifibss->skb_queue); | |
46900298 JB |
835 | } |
836 | ||
837 | /* scan finished notification */ | |
838 | void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) | |
839 | { | |
af8cdcd8 | 840 | struct ieee80211_sub_if_data *sdata; |
46900298 | 841 | |
29b4a4f7 JB |
842 | mutex_lock(&local->iflist_mtx); |
843 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 844 | if (!ieee80211_sdata_running(sdata)) |
0e41f715 | 845 | continue; |
af8cdcd8 JB |
846 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
847 | continue; | |
0e41f715 JB |
848 | if (!sdata->u.ibss.ssid_len) |
849 | continue; | |
af8cdcd8 | 850 | sdata->u.ibss.last_scan_completed = jiffies; |
51f98f13 | 851 | mod_timer(&sdata->u.ibss.timer, 0); |
46900298 | 852 | } |
29b4a4f7 | 853 | mutex_unlock(&local->iflist_mtx); |
46900298 JB |
854 | } |
855 | ||
856 | ieee80211_rx_result | |
f1d58c25 | 857 | ieee80211_ibss_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) |
46900298 JB |
858 | { |
859 | struct ieee80211_local *local = sdata->local; | |
860 | struct ieee80211_mgmt *mgmt; | |
861 | u16 fc; | |
862 | ||
863 | if (skb->len < 24) | |
864 | return RX_DROP_MONITOR; | |
865 | ||
866 | mgmt = (struct ieee80211_mgmt *) skb->data; | |
867 | fc = le16_to_cpu(mgmt->frame_control); | |
868 | ||
869 | switch (fc & IEEE80211_FCTL_STYPE) { | |
870 | case IEEE80211_STYPE_PROBE_RESP: | |
871 | case IEEE80211_STYPE_BEACON: | |
46900298 JB |
872 | case IEEE80211_STYPE_PROBE_REQ: |
873 | case IEEE80211_STYPE_AUTH: | |
874 | skb_queue_tail(&sdata->u.ibss.skb_queue, skb); | |
42935eca | 875 | ieee80211_queue_work(&local->hw, &sdata->u.ibss.work); |
46900298 JB |
876 | return RX_QUEUED; |
877 | } | |
878 | ||
879 | return RX_DROP_MONITOR; | |
880 | } | |
af8cdcd8 JB |
881 | |
882 | int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, | |
883 | struct cfg80211_ibss_params *params) | |
884 | { | |
885 | struct sk_buff *skb; | |
886 | ||
af8cdcd8 JB |
887 | if (params->bssid) { |
888 | memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); | |
889 | sdata->u.ibss.fixed_bssid = true; | |
890 | } else | |
891 | sdata->u.ibss.fixed_bssid = false; | |
892 | ||
fffd0934 JB |
893 | sdata->u.ibss.privacy = params->privacy; |
894 | ||
57c4d7b4 JB |
895 | sdata->vif.bss_conf.beacon_int = params->beacon_interval; |
896 | ||
af8cdcd8 JB |
897 | sdata->u.ibss.channel = params->channel; |
898 | sdata->u.ibss.fixed_channel = params->channel_fixed; | |
899 | ||
900 | if (params->ie) { | |
901 | sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, | |
902 | GFP_KERNEL); | |
903 | if (sdata->u.ibss.ie) | |
904 | sdata->u.ibss.ie_len = params->ie_len; | |
905 | } | |
906 | ||
907 | skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + | |
908 | 36 /* bitrates */ + | |
909 | 34 /* SSID */ + | |
910 | 3 /* DS params */ + | |
911 | 4 /* IBSS params */ + | |
912 | params->ie_len); | |
913 | if (!skb) | |
914 | return -ENOMEM; | |
915 | ||
916 | sdata->u.ibss.skb = skb; | |
917 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; | |
918 | sdata->u.ibss.ibss_join_req = jiffies; | |
919 | ||
0e41f715 JB |
920 | memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN); |
921 | ||
922 | /* | |
923 | * The ssid_len setting below is used to see whether | |
924 | * we are active, and we need all other settings | |
925 | * before that may get visible. | |
926 | */ | |
927 | mb(); | |
928 | ||
929 | sdata->u.ibss.ssid_len = params->ssid_len; | |
930 | ||
5cff20e6 JB |
931 | ieee80211_recalc_idle(sdata->local); |
932 | ||
af8cdcd8 | 933 | set_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request); |
42935eca | 934 | ieee80211_queue_work(&sdata->local->hw, &sdata->u.ibss.work); |
af8cdcd8 JB |
935 | |
936 | return 0; | |
937 | } | |
938 | ||
939 | int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) | |
940 | { | |
941 | struct sk_buff *skb; | |
942 | ||
943 | del_timer_sync(&sdata->u.ibss.timer); | |
944 | clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request); | |
945 | cancel_work_sync(&sdata->u.ibss.work); | |
946 | clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request); | |
947 | ||
948 | sta_info_flush(sdata->local, sdata); | |
949 | ||
950 | /* remove beacon */ | |
951 | kfree(sdata->u.ibss.ie); | |
952 | skb = sdata->u.ibss.presp; | |
953 | rcu_assign_pointer(sdata->u.ibss.presp, NULL); | |
2d0ddec5 | 954 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED); |
af8cdcd8 JB |
955 | synchronize_rcu(); |
956 | kfree_skb(skb); | |
957 | ||
958 | skb_queue_purge(&sdata->u.ibss.skb_queue); | |
959 | memset(sdata->u.ibss.bssid, 0, ETH_ALEN); | |
5cff20e6 JB |
960 | sdata->u.ibss.ssid_len = 0; |
961 | ||
962 | ieee80211_recalc_idle(sdata->local); | |
af8cdcd8 JB |
963 | |
964 | return 0; | |
965 | } |