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> | |
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" | |
24487981 | 25 | #include "driver-ops.h" |
46900298 JB |
26 | #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) | |
4a332a38 | 33 | #define IEEE80211_IBSS_MERGE_DELAY 0x400000 |
46900298 JB |
34 | #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ) |
35 | ||
36 | #define IEEE80211_IBSS_MAX_STA_ENTRIES 128 | |
37 | ||
38 | ||
39 | static 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, | |
fffd0934 | 60 | sdata->u.ibss.bssid, NULL, 0, 0); |
46900298 JB |
61 | } |
62 | ||
af8cdcd8 JB |
63 | static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
64 | const u8 *bssid, const int beacon_int, | |
65 | struct ieee80211_channel *chan, | |
b59066a2 | 66 | const u32 basic_rates, |
af8cdcd8 | 67 | const u16 capability, u64 tsf) |
46900298 JB |
68 | { |
69 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
70 | struct ieee80211_local *local = sdata->local; | |
b59066a2 | 71 | int rates, i; |
46900298 JB |
72 | struct sk_buff *skb; |
73 | struct ieee80211_mgmt *mgmt; | |
74 | u8 *pos; | |
75 | struct ieee80211_supported_band *sband; | |
f446d10f | 76 | struct cfg80211_bss *bss; |
57c4d7b4 | 77 | u32 bss_change; |
b59066a2 | 78 | u8 supp_rates[IEEE80211_MAX_SUPP_RATES]; |
24487981 JB |
79 | |
80 | /* Reset own TSF to allow time synchronization work. */ | |
81 | drv_reset_tsf(local); | |
46900298 | 82 | |
af8cdcd8 JB |
83 | 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); | |
46900298 | 90 | |
af8cdcd8 JB |
91 | if (memcmp(ifibss->bssid, bssid, ETH_ALEN)) |
92 | sta_info_flush(sdata->local, sdata); | |
46900298 JB |
93 | |
94 | memcpy(ifibss->bssid, bssid, ETH_ALEN); | |
46900298 | 95 | |
af8cdcd8 | 96 | sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0; |
46900298 | 97 | |
af8cdcd8 JB |
98 | local->oper_channel = chan; |
99 | local->oper_channel_type = NL80211_CHAN_NO_HT; | |
100 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); | |
57c4d7b4 | 101 | |
af8cdcd8 | 102 | sband = local->hw.wiphy->bands[chan->band]; |
46900298 | 103 | |
b59066a2 JB |
104 | /* 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 | ||
46900298 | 114 | /* Build IBSS probe response */ |
af8cdcd8 | 115 | mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon)); |
46900298 JB |
116 | 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); | |
47846c9b | 120 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
46900298 | 121 | memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN); |
57c4d7b4 | 122 | mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int); |
707c1b4e | 123 | mgmt->u.beacon.timestamp = cpu_to_le64(tsf); |
46900298 JB |
124 | 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 | ||
b59066a2 | 131 | rates = sband->n_bitrates; |
46900298 JB |
132 | 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; | |
af8cdcd8 | 143 | *pos++ = ieee80211_frequency_to_channel(chan->center_freq); |
46900298 JB |
144 | } |
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 | ||
b59066a2 JB |
153 | if (sband->n_bitrates > 8) { |
154 | rates = sband->n_bitrates - 8; | |
46900298 JB |
155 | 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 | ||
af8cdcd8 JB |
161 | 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); | |
46900298 | 166 | |
2d0ddec5 JB |
167 | 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); | |
46900298 | 174 | |
b59066a2 | 175 | ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates); |
46900298 | 176 | |
46900298 | 177 | ifibss->state = IEEE80211_IBSS_MLME_JOINED; |
af8cdcd8 JB |
178 | mod_timer(&ifibss->timer, |
179 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 | 180 | |
f446d10f JB |
181 | bss = cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel, |
182 | mgmt, skb->len, 0, GFP_KERNEL); | |
183 | cfg80211_put_bss(bss); | |
af8cdcd8 | 184 | cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL); |
46900298 JB |
185 | } |
186 | ||
af8cdcd8 JB |
187 | static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
188 | struct ieee80211_bss *bss) | |
46900298 | 189 | { |
0c1ad2ca JB |
190 | struct cfg80211_bss *cbss = |
191 | container_of((void *)bss, struct cfg80211_bss, priv); | |
b59066a2 JB |
192 | struct ieee80211_supported_band *sband; |
193 | u32 basic_rates; | |
194 | int i, j; | |
0c1ad2ca | 195 | u16 beacon_int = cbss->beacon_interval; |
57c4d7b4 JB |
196 | |
197 | if (beacon_int < 10) | |
198 | beacon_int = 10; | |
199 | ||
0c1ad2ca | 200 | sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; |
b59066a2 JB |
201 | |
202 | basic_rates = 0; | |
203 | ||
204 | for (i = 0; i < bss->supp_rates_len; i++) { | |
205 | int rate = (bss->supp_rates[i] & 0x7f) * 5; | |
206 | bool is_basic = !!(bss->supp_rates[i] & 0x80); | |
207 | ||
208 | for (j = 0; j < sband->n_bitrates; j++) { | |
209 | if (sband->bitrates[j].bitrate == rate) { | |
210 | if (is_basic) | |
211 | basic_rates |= BIT(j); | |
212 | break; | |
213 | } | |
214 | } | |
215 | } | |
216 | ||
0c1ad2ca | 217 | __ieee80211_sta_join_ibss(sdata, cbss->bssid, |
57c4d7b4 | 218 | beacon_int, |
0c1ad2ca | 219 | cbss->channel, |
b59066a2 | 220 | basic_rates, |
0c1ad2ca JB |
221 | cbss->capability, |
222 | cbss->tsf); | |
46900298 JB |
223 | } |
224 | ||
225 | static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, | |
226 | struct ieee80211_mgmt *mgmt, | |
227 | size_t len, | |
228 | struct ieee80211_rx_status *rx_status, | |
229 | struct ieee802_11_elems *elems, | |
230 | bool beacon) | |
231 | { | |
232 | struct ieee80211_local *local = sdata->local; | |
233 | int freq; | |
0c1ad2ca | 234 | struct cfg80211_bss *cbss; |
46900298 JB |
235 | struct ieee80211_bss *bss; |
236 | struct sta_info *sta; | |
237 | struct ieee80211_channel *channel; | |
238 | u64 beacon_timestamp, rx_timestamp; | |
239 | u32 supp_rates = 0; | |
240 | enum ieee80211_band band = rx_status->band; | |
241 | ||
242 | if (elems->ds_params && elems->ds_params_len == 1) | |
243 | freq = ieee80211_channel_to_frequency(elems->ds_params[0]); | |
244 | else | |
245 | freq = rx_status->freq; | |
246 | ||
247 | channel = ieee80211_get_channel(local->hw.wiphy, freq); | |
248 | ||
249 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
250 | return; | |
251 | ||
252 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates && | |
253 | memcmp(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) { | |
254 | supp_rates = ieee80211_sta_get_rates(local, elems, band); | |
255 | ||
256 | rcu_read_lock(); | |
257 | ||
abe60632 | 258 | sta = sta_info_get(sdata, mgmt->sa); |
46900298 JB |
259 | if (sta) { |
260 | u32 prev_rates; | |
261 | ||
262 | prev_rates = sta->sta.supp_rates[band]; | |
263 | /* make sure mandatory rates are always added */ | |
264 | sta->sta.supp_rates[band] = supp_rates | | |
265 | ieee80211_mandatory_rates(local, band); | |
266 | ||
09a08cff | 267 | if (sta->sta.supp_rates[band] != prev_rates) { |
46900298 | 268 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
46900298 | 269 | printk(KERN_DEBUG "%s: updated supp_rates set " |
09a08cff BR |
270 | "for %pM based on beacon/probe_response " |
271 | "(0x%x -> 0x%x)\n", | |
272 | sdata->name, sta->sta.addr, | |
273 | prev_rates, sta->sta.supp_rates[band]); | |
46900298 | 274 | #endif |
09a08cff BR |
275 | rate_control_rate_init(sta); |
276 | } | |
34e89507 JB |
277 | rcu_read_unlock(); |
278 | } else { | |
279 | rcu_read_unlock(); | |
280 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, | |
281 | supp_rates, GFP_KERNEL); | |
282 | } | |
46900298 JB |
283 | } |
284 | ||
285 | bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, | |
286 | channel, beacon); | |
287 | if (!bss) | |
288 | return; | |
289 | ||
0c1ad2ca JB |
290 | cbss = container_of((void *)bss, struct cfg80211_bss, priv); |
291 | ||
46900298 | 292 | /* was just updated in ieee80211_bss_info_update */ |
0c1ad2ca | 293 | beacon_timestamp = cbss->tsf; |
46900298 JB |
294 | |
295 | /* check if we need to merge IBSS */ | |
296 | ||
46900298 | 297 | /* we use a fixed BSSID */ |
a98bfec2 | 298 | if (sdata->u.ibss.fixed_bssid) |
46900298 JB |
299 | goto put_bss; |
300 | ||
301 | /* not an IBSS */ | |
0c1ad2ca | 302 | if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) |
46900298 JB |
303 | goto put_bss; |
304 | ||
305 | /* different channel */ | |
0c1ad2ca | 306 | if (cbss->channel != local->oper_channel) |
46900298 JB |
307 | goto put_bss; |
308 | ||
309 | /* different SSID */ | |
310 | if (elems->ssid_len != sdata->u.ibss.ssid_len || | |
311 | memcmp(elems->ssid, sdata->u.ibss.ssid, | |
312 | sdata->u.ibss.ssid_len)) | |
313 | goto put_bss; | |
314 | ||
34e8f082 | 315 | /* same BSSID */ |
0c1ad2ca | 316 | if (memcmp(cbss->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) |
34e8f082 AF |
317 | goto put_bss; |
318 | ||
46900298 JB |
319 | if (rx_status->flag & RX_FLAG_TSFT) { |
320 | /* | |
321 | * For correct IBSS merging we need mactime; since mactime is | |
322 | * defined as the time the first data symbol of the frame hits | |
323 | * the PHY, and the timestamp of the beacon is defined as "the | |
324 | * time that the data symbol containing the first bit of the | |
325 | * timestamp is transmitted to the PHY plus the transmitting | |
326 | * STA's delays through its local PHY from the MAC-PHY | |
327 | * interface to its interface with the WM" (802.11 11.1.2) | |
328 | * - equals the time this bit arrives at the receiver - we have | |
329 | * to take into account the offset between the two. | |
330 | * | |
331 | * E.g. at 1 MBit that means mactime is 192 usec earlier | |
332 | * (=24 bytes * 8 usecs/byte) than the beacon timestamp. | |
333 | */ | |
334 | int rate; | |
335 | ||
336 | if (rx_status->flag & RX_FLAG_HT) | |
337 | rate = 65; /* TODO: HT rates */ | |
338 | else | |
339 | rate = local->hw.wiphy->bands[band]-> | |
340 | bitrates[rx_status->rate_idx].bitrate; | |
341 | ||
342 | rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate); | |
24487981 JB |
343 | } else { |
344 | /* | |
345 | * second best option: get current TSF | |
346 | * (will return -1 if not supported) | |
347 | */ | |
348 | rx_timestamp = drv_get_tsf(local); | |
349 | } | |
46900298 JB |
350 | |
351 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
352 | printk(KERN_DEBUG "RX beacon SA=%pM BSSID=" | |
353 | "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", | |
354 | mgmt->sa, mgmt->bssid, | |
355 | (unsigned long long)rx_timestamp, | |
356 | (unsigned long long)beacon_timestamp, | |
357 | (unsigned long long)(rx_timestamp - beacon_timestamp), | |
358 | jiffies); | |
359 | #endif | |
360 | ||
4a332a38 AF |
361 | /* give slow hardware some time to do the TSF sync */ |
362 | if (rx_timestamp < IEEE80211_IBSS_MERGE_DELAY) | |
363 | goto put_bss; | |
364 | ||
46900298 JB |
365 | if (beacon_timestamp > rx_timestamp) { |
366 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
367 | printk(KERN_DEBUG "%s: beacon TSF higher than " | |
368 | "local TSF - IBSS merge with BSSID %pM\n", | |
47846c9b | 369 | sdata->name, mgmt->bssid); |
46900298 JB |
370 | #endif |
371 | ieee80211_sta_join_ibss(sdata, bss); | |
09a08cff | 372 | supp_rates = ieee80211_sta_get_rates(local, elems, band); |
34e89507 JB |
373 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, |
374 | supp_rates, GFP_KERNEL); | |
46900298 JB |
375 | } |
376 | ||
377 | put_bss: | |
378 | ieee80211_rx_bss_put(local, bss); | |
379 | } | |
380 | ||
381 | /* | |
382 | * Add a new IBSS station, will also be called by the RX code when, | |
383 | * in IBSS mode, receiving a frame from a yet-unknown station, hence | |
384 | * must be callable in atomic context. | |
385 | */ | |
386 | struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, | |
34e89507 JB |
387 | u8 *bssid,u8 *addr, u32 supp_rates, |
388 | gfp_t gfp) | |
46900298 | 389 | { |
2e10d330 | 390 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
46900298 JB |
391 | struct ieee80211_local *local = sdata->local; |
392 | struct sta_info *sta; | |
393 | int band = local->hw.conf.channel->band; | |
394 | ||
af8cdcd8 JB |
395 | /* |
396 | * XXX: Consider removing the least recently used entry and | |
397 | * allow new one to be added. | |
398 | */ | |
46900298 | 399 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { |
af8cdcd8 JB |
400 | if (net_ratelimit()) |
401 | printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n", | |
47846c9b | 402 | sdata->name, addr); |
46900298 JB |
403 | return NULL; |
404 | } | |
405 | ||
2e10d330 FF |
406 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) |
407 | return NULL; | |
408 | ||
46900298 JB |
409 | if (compare_ether_addr(bssid, sdata->u.ibss.bssid)) |
410 | return NULL; | |
411 | ||
412 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
413 | printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n", | |
47846c9b | 414 | wiphy_name(local->hw.wiphy), addr, sdata->name); |
46900298 JB |
415 | #endif |
416 | ||
34e89507 | 417 | sta = sta_info_alloc(sdata, addr, gfp); |
46900298 JB |
418 | if (!sta) |
419 | return NULL; | |
420 | ||
421 | set_sta_flags(sta, WLAN_STA_AUTHORIZED); | |
422 | ||
423 | /* make sure mandatory rates are always added */ | |
424 | sta->sta.supp_rates[band] = supp_rates | | |
425 | ieee80211_mandatory_rates(local, band); | |
426 | ||
427 | rate_control_rate_init(sta); | |
428 | ||
34e89507 | 429 | /* If it fails, maybe we raced another insertion? */ |
46900298 | 430 | if (sta_info_insert(sta)) |
34e89507 | 431 | return sta_info_get(sdata, addr); |
46900298 JB |
432 | return sta; |
433 | } | |
434 | ||
435 | static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) | |
436 | { | |
437 | struct ieee80211_local *local = sdata->local; | |
438 | int active = 0; | |
439 | struct sta_info *sta; | |
440 | ||
441 | rcu_read_lock(); | |
442 | ||
443 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
444 | if (sta->sdata == sdata && | |
445 | time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL, | |
446 | jiffies)) { | |
447 | active++; | |
448 | break; | |
449 | } | |
450 | } | |
451 | ||
452 | rcu_read_unlock(); | |
453 | ||
454 | return active; | |
455 | } | |
456 | ||
ce9058ae BP |
457 | /* |
458 | * This function is called with state == IEEE80211_IBSS_MLME_JOINED | |
459 | */ | |
46900298 JB |
460 | |
461 | static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) | |
462 | { | |
463 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
464 | ||
af8cdcd8 JB |
465 | mod_timer(&ifibss->timer, |
466 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 JB |
467 | |
468 | ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT); | |
af8cdcd8 | 469 | |
450aae3d S |
470 | if (time_before(jiffies, ifibss->last_scan_completed + |
471 | IEEE80211_IBSS_MERGE_INTERVAL)) | |
472 | return; | |
473 | ||
46900298 JB |
474 | if (ieee80211_sta_active_ibss(sdata)) |
475 | return; | |
476 | ||
af8cdcd8 | 477 | if (ifibss->fixed_channel) |
46900298 JB |
478 | return; |
479 | ||
480 | printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other " | |
47846c9b | 481 | "IBSS networks with same SSID (merge)\n", sdata->name); |
46900298 | 482 | |
f3b85252 | 483 | ieee80211_request_internal_scan(sdata, ifibss->ssid, ifibss->ssid_len); |
46900298 JB |
484 | } |
485 | ||
af8cdcd8 | 486 | static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
487 | { |
488 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
489 | struct ieee80211_local *local = sdata->local; | |
490 | struct ieee80211_supported_band *sband; | |
46900298 | 491 | u8 bssid[ETH_ALEN]; |
46900298 JB |
492 | u16 capability; |
493 | int i; | |
494 | ||
af8cdcd8 | 495 | if (ifibss->fixed_bssid) { |
46900298 JB |
496 | memcpy(bssid, ifibss->bssid, ETH_ALEN); |
497 | } else { | |
498 | /* Generate random, not broadcast, locally administered BSSID. Mix in | |
499 | * own MAC address to make sure that devices that do not have proper | |
500 | * random number generator get different BSSID. */ | |
501 | get_random_bytes(bssid, ETH_ALEN); | |
502 | for (i = 0; i < ETH_ALEN; i++) | |
47846c9b | 503 | bssid[i] ^= sdata->vif.addr[i]; |
46900298 JB |
504 | bssid[0] &= ~0x01; |
505 | bssid[0] |= 0x02; | |
506 | } | |
507 | ||
508 | printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n", | |
47846c9b | 509 | sdata->name, bssid); |
46900298 | 510 | |
af8cdcd8 | 511 | sband = local->hw.wiphy->bands[ifibss->channel->band]; |
46900298 | 512 | |
46900298 JB |
513 | capability = WLAN_CAPABILITY_IBSS; |
514 | ||
fffd0934 | 515 | if (ifibss->privacy) |
46900298 JB |
516 | capability |= WLAN_CAPABILITY_PRIVACY; |
517 | else | |
518 | sdata->drop_unencrypted = 0; | |
519 | ||
57c4d7b4 | 520 | __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, |
b59066a2 JB |
521 | ifibss->channel, 3, /* first two are basic */ |
522 | capability, 0); | |
46900298 JB |
523 | } |
524 | ||
ce9058ae BP |
525 | /* |
526 | * This function is called with state == IEEE80211_IBSS_MLME_SEARCH | |
527 | */ | |
528 | ||
af8cdcd8 | 529 | static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
530 | { |
531 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
532 | struct ieee80211_local *local = sdata->local; | |
0c1ad2ca | 533 | struct cfg80211_bss *cbss; |
af8cdcd8 | 534 | struct ieee80211_channel *chan = NULL; |
46900298 JB |
535 | const u8 *bssid = NULL; |
536 | int active_ibss; | |
e0d61887 | 537 | u16 capability; |
46900298 | 538 | |
46900298 JB |
539 | active_ibss = ieee80211_sta_active_ibss(sdata); |
540 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
541 | printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n", | |
47846c9b | 542 | sdata->name, active_ibss); |
46900298 JB |
543 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
544 | ||
545 | if (active_ibss) | |
af8cdcd8 | 546 | return; |
46900298 | 547 | |
e0d61887 | 548 | capability = WLAN_CAPABILITY_IBSS; |
fffd0934 | 549 | if (ifibss->privacy) |
e0d61887 | 550 | capability |= WLAN_CAPABILITY_PRIVACY; |
af8cdcd8 JB |
551 | if (ifibss->fixed_bssid) |
552 | bssid = ifibss->bssid; | |
553 | if (ifibss->fixed_channel) | |
554 | chan = ifibss->channel; | |
555 | if (!is_zero_ether_addr(ifibss->bssid)) | |
46900298 | 556 | bssid = ifibss->bssid; |
0c1ad2ca JB |
557 | cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, |
558 | ifibss->ssid, ifibss->ssid_len, | |
559 | WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY, | |
560 | capability); | |
561 | ||
562 | if (cbss) { | |
563 | struct ieee80211_bss *bss; | |
46900298 | 564 | |
0c1ad2ca | 565 | bss = (void *)cbss->priv; |
46900298 | 566 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
46900298 | 567 | printk(KERN_DEBUG " sta_find_ibss: selected %pM current " |
0c1ad2ca | 568 | "%pM\n", cbss->bssid, ifibss->bssid); |
46900298 JB |
569 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
570 | ||
46900298 JB |
571 | printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM" |
572 | " based on configured SSID\n", | |
0c1ad2ca | 573 | sdata->name, cbss->bssid); |
46900298 | 574 | |
af8cdcd8 | 575 | ieee80211_sta_join_ibss(sdata, bss); |
46900298 | 576 | ieee80211_rx_bss_put(local, bss); |
af8cdcd8 | 577 | return; |
d419b9f0 | 578 | } |
46900298 JB |
579 | |
580 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
581 | printk(KERN_DEBUG " did not try to join ibss\n"); | |
582 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ | |
583 | ||
584 | /* Selected IBSS not found in current scan results - try to scan */ | |
ce9058ae | 585 | if (time_after(jiffies, ifibss->last_scan_completed + |
46900298 JB |
586 | IEEE80211_SCAN_INTERVAL)) { |
587 | printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to " | |
47846c9b | 588 | "join\n", sdata->name); |
46900298 | 589 | |
f3b85252 JB |
590 | ieee80211_request_internal_scan(sdata, ifibss->ssid, |
591 | ifibss->ssid_len); | |
ce9058ae | 592 | } else { |
46900298 JB |
593 | int interval = IEEE80211_SCAN_INTERVAL; |
594 | ||
595 | if (time_after(jiffies, ifibss->ibss_join_req + | |
596 | IEEE80211_IBSS_JOIN_TIMEOUT)) { | |
af8cdcd8 JB |
597 | if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) { |
598 | ieee80211_sta_create_ibss(sdata); | |
599 | return; | |
600 | } | |
46900298 | 601 | printk(KERN_DEBUG "%s: IBSS not allowed on" |
47846c9b | 602 | " %d MHz\n", sdata->name, |
46900298 JB |
603 | local->hw.conf.channel->center_freq); |
604 | ||
605 | /* No IBSS found - decrease scan interval and continue | |
606 | * scanning. */ | |
607 | interval = IEEE80211_SCAN_INTERVAL_SLOW; | |
608 | } | |
609 | ||
af8cdcd8 JB |
610 | mod_timer(&ifibss->timer, |
611 | round_jiffies(jiffies + interval)); | |
46900298 | 612 | } |
46900298 JB |
613 | } |
614 | ||
615 | static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, | |
616 | struct ieee80211_mgmt *mgmt, | |
617 | size_t len) | |
618 | { | |
619 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
620 | struct ieee80211_local *local = sdata->local; | |
621 | int tx_last_beacon; | |
622 | struct sk_buff *skb; | |
623 | struct ieee80211_mgmt *resp; | |
624 | u8 *pos, *end; | |
625 | ||
626 | if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || | |
af8cdcd8 | 627 | len < 24 + 2 || !ifibss->presp) |
46900298 JB |
628 | return; |
629 | ||
24487981 | 630 | tx_last_beacon = drv_tx_last_beacon(local); |
46900298 JB |
631 | |
632 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
633 | printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM" | |
634 | " (tx_last_beacon=%d)\n", | |
47846c9b | 635 | sdata->name, mgmt->sa, mgmt->da, |
46900298 JB |
636 | mgmt->bssid, tx_last_beacon); |
637 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ | |
638 | ||
639 | if (!tx_last_beacon) | |
640 | return; | |
641 | ||
642 | if (memcmp(mgmt->bssid, ifibss->bssid, ETH_ALEN) != 0 && | |
643 | memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0) | |
644 | return; | |
645 | ||
646 | end = ((u8 *) mgmt) + len; | |
647 | pos = mgmt->u.probe_req.variable; | |
648 | if (pos[0] != WLAN_EID_SSID || | |
649 | pos + 2 + pos[1] > end) { | |
650 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
651 | printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq " | |
652 | "from %pM\n", | |
47846c9b | 653 | sdata->name, mgmt->sa); |
46900298 JB |
654 | #endif |
655 | return; | |
656 | } | |
657 | if (pos[1] != 0 && | |
658 | (pos[1] != ifibss->ssid_len || | |
0da780c2 | 659 | memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { |
46900298 JB |
660 | /* Ignore ProbeReq for foreign SSID */ |
661 | return; | |
662 | } | |
663 | ||
664 | /* Reply with ProbeResp */ | |
af8cdcd8 | 665 | skb = skb_copy(ifibss->presp, GFP_KERNEL); |
46900298 JB |
666 | if (!skb) |
667 | return; | |
668 | ||
669 | resp = (struct ieee80211_mgmt *) skb->data; | |
670 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
671 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
672 | printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n", | |
47846c9b | 673 | sdata->name, resp->da); |
46900298 | 674 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
62ae67be JB |
675 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
676 | ieee80211_tx_skb(sdata, skb); | |
46900298 JB |
677 | } |
678 | ||
679 | static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, | |
680 | struct ieee80211_mgmt *mgmt, | |
681 | size_t len, | |
682 | struct ieee80211_rx_status *rx_status) | |
683 | { | |
684 | size_t baselen; | |
685 | struct ieee802_11_elems elems; | |
686 | ||
47846c9b | 687 | if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN)) |
46900298 JB |
688 | return; /* ignore ProbeResp to foreign address */ |
689 | ||
690 | baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; | |
691 | if (baselen > len) | |
692 | return; | |
693 | ||
694 | ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, | |
695 | &elems); | |
696 | ||
697 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); | |
698 | } | |
699 | ||
700 | static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, | |
701 | struct ieee80211_mgmt *mgmt, | |
702 | size_t len, | |
703 | struct ieee80211_rx_status *rx_status) | |
704 | { | |
705 | size_t baselen; | |
706 | struct ieee802_11_elems elems; | |
707 | ||
708 | /* Process beacon from the current BSS */ | |
709 | baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; | |
710 | if (baselen > len) | |
711 | return; | |
712 | ||
713 | ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems); | |
714 | ||
715 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true); | |
716 | } | |
717 | ||
718 | static void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, | |
719 | struct sk_buff *skb) | |
720 | { | |
721 | struct ieee80211_rx_status *rx_status; | |
722 | struct ieee80211_mgmt *mgmt; | |
723 | u16 fc; | |
724 | ||
f1d58c25 | 725 | rx_status = IEEE80211_SKB_RXCB(skb); |
46900298 JB |
726 | mgmt = (struct ieee80211_mgmt *) skb->data; |
727 | fc = le16_to_cpu(mgmt->frame_control); | |
728 | ||
729 | switch (fc & IEEE80211_FCTL_STYPE) { | |
730 | case IEEE80211_STYPE_PROBE_REQ: | |
731 | ieee80211_rx_mgmt_probe_req(sdata, mgmt, skb->len); | |
732 | break; | |
733 | case IEEE80211_STYPE_PROBE_RESP: | |
734 | ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, | |
735 | rx_status); | |
736 | break; | |
737 | case IEEE80211_STYPE_BEACON: | |
738 | ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, | |
739 | rx_status); | |
740 | break; | |
741 | case IEEE80211_STYPE_AUTH: | |
742 | ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); | |
743 | break; | |
744 | } | |
745 | ||
746 | kfree_skb(skb); | |
747 | } | |
748 | ||
749 | static void ieee80211_ibss_work(struct work_struct *work) | |
750 | { | |
751 | struct ieee80211_sub_if_data *sdata = | |
752 | container_of(work, struct ieee80211_sub_if_data, u.ibss.work); | |
753 | struct ieee80211_local *local = sdata->local; | |
754 | struct ieee80211_if_ibss *ifibss; | |
755 | struct sk_buff *skb; | |
756 | ||
5bb644a0 JB |
757 | if (WARN_ON(local->suspended)) |
758 | return; | |
759 | ||
9607e6b6 | 760 | if (!ieee80211_sdata_running(sdata)) |
46900298 JB |
761 | return; |
762 | ||
fbe9c429 | 763 | if (local->scanning) |
46900298 JB |
764 | return; |
765 | ||
766 | if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_ADHOC)) | |
767 | return; | |
768 | ifibss = &sdata->u.ibss; | |
769 | ||
770 | while ((skb = skb_dequeue(&ifibss->skb_queue))) | |
771 | ieee80211_ibss_rx_queued_mgmt(sdata, skb); | |
772 | ||
773 | if (!test_and_clear_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request)) | |
774 | return; | |
775 | ||
776 | switch (ifibss->state) { | |
777 | case IEEE80211_IBSS_MLME_SEARCH: | |
778 | ieee80211_sta_find_ibss(sdata); | |
779 | break; | |
780 | case IEEE80211_IBSS_MLME_JOINED: | |
781 | ieee80211_sta_merge_ibss(sdata); | |
782 | break; | |
783 | default: | |
784 | WARN_ON(1); | |
785 | break; | |
786 | } | |
787 | } | |
788 | ||
789 | static void ieee80211_ibss_timer(unsigned long data) | |
790 | { | |
791 | struct ieee80211_sub_if_data *sdata = | |
792 | (struct ieee80211_sub_if_data *) data; | |
793 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
794 | struct ieee80211_local *local = sdata->local; | |
795 | ||
5bb644a0 JB |
796 | if (local->quiescing) { |
797 | ifibss->timer_running = true; | |
798 | return; | |
799 | } | |
800 | ||
46900298 | 801 | set_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request); |
42935eca | 802 | ieee80211_queue_work(&local->hw, &ifibss->work); |
46900298 JB |
803 | } |
804 | ||
5bb644a0 JB |
805 | #ifdef CONFIG_PM |
806 | void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata) | |
807 | { | |
808 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
809 | ||
810 | cancel_work_sync(&ifibss->work); | |
811 | if (del_timer_sync(&ifibss->timer)) | |
812 | ifibss->timer_running = true; | |
813 | } | |
814 | ||
815 | void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata) | |
816 | { | |
817 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
818 | ||
819 | if (ifibss->timer_running) { | |
820 | add_timer(&ifibss->timer); | |
821 | ifibss->timer_running = false; | |
822 | } | |
823 | } | |
824 | #endif | |
825 | ||
46900298 JB |
826 | void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) |
827 | { | |
828 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
829 | ||
830 | INIT_WORK(&ifibss->work, ieee80211_ibss_work); | |
831 | setup_timer(&ifibss->timer, ieee80211_ibss_timer, | |
832 | (unsigned long) sdata); | |
833 | skb_queue_head_init(&ifibss->skb_queue); | |
46900298 JB |
834 | } |
835 | ||
836 | /* scan finished notification */ | |
837 | void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) | |
838 | { | |
af8cdcd8 | 839 | struct ieee80211_sub_if_data *sdata; |
46900298 | 840 | |
29b4a4f7 JB |
841 | mutex_lock(&local->iflist_mtx); |
842 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 843 | if (!ieee80211_sdata_running(sdata)) |
0e41f715 | 844 | continue; |
af8cdcd8 JB |
845 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
846 | continue; | |
0e41f715 JB |
847 | if (!sdata->u.ibss.ssid_len) |
848 | continue; | |
af8cdcd8 | 849 | sdata->u.ibss.last_scan_completed = jiffies; |
51f98f13 | 850 | mod_timer(&sdata->u.ibss.timer, 0); |
46900298 | 851 | } |
29b4a4f7 | 852 | mutex_unlock(&local->iflist_mtx); |
46900298 JB |
853 | } |
854 | ||
855 | ieee80211_rx_result | |
f1d58c25 | 856 | ieee80211_ibss_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) |
46900298 JB |
857 | { |
858 | struct ieee80211_local *local = sdata->local; | |
859 | struct ieee80211_mgmt *mgmt; | |
860 | u16 fc; | |
861 | ||
862 | if (skb->len < 24) | |
863 | return RX_DROP_MONITOR; | |
864 | ||
865 | mgmt = (struct ieee80211_mgmt *) skb->data; | |
866 | fc = le16_to_cpu(mgmt->frame_control); | |
867 | ||
868 | switch (fc & IEEE80211_FCTL_STYPE) { | |
869 | case IEEE80211_STYPE_PROBE_RESP: | |
870 | case IEEE80211_STYPE_BEACON: | |
46900298 JB |
871 | case IEEE80211_STYPE_PROBE_REQ: |
872 | case IEEE80211_STYPE_AUTH: | |
873 | skb_queue_tail(&sdata->u.ibss.skb_queue, skb); | |
42935eca | 874 | ieee80211_queue_work(&local->hw, &sdata->u.ibss.work); |
46900298 JB |
875 | return RX_QUEUED; |
876 | } | |
877 | ||
878 | return RX_DROP_MONITOR; | |
879 | } | |
af8cdcd8 JB |
880 | |
881 | int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, | |
882 | struct cfg80211_ibss_params *params) | |
883 | { | |
884 | struct sk_buff *skb; | |
885 | ||
af8cdcd8 JB |
886 | if (params->bssid) { |
887 | memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); | |
888 | sdata->u.ibss.fixed_bssid = true; | |
889 | } else | |
890 | sdata->u.ibss.fixed_bssid = false; | |
891 | ||
fffd0934 JB |
892 | sdata->u.ibss.privacy = params->privacy; |
893 | ||
57c4d7b4 JB |
894 | sdata->vif.bss_conf.beacon_int = params->beacon_interval; |
895 | ||
af8cdcd8 JB |
896 | sdata->u.ibss.channel = params->channel; |
897 | sdata->u.ibss.fixed_channel = params->channel_fixed; | |
898 | ||
899 | if (params->ie) { | |
900 | sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, | |
901 | GFP_KERNEL); | |
902 | if (sdata->u.ibss.ie) | |
903 | sdata->u.ibss.ie_len = params->ie_len; | |
904 | } | |
905 | ||
906 | skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + | |
907 | 36 /* bitrates */ + | |
908 | 34 /* SSID */ + | |
909 | 3 /* DS params */ + | |
910 | 4 /* IBSS params */ + | |
911 | params->ie_len); | |
912 | if (!skb) | |
913 | return -ENOMEM; | |
914 | ||
915 | sdata->u.ibss.skb = skb; | |
916 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; | |
917 | sdata->u.ibss.ibss_join_req = jiffies; | |
918 | ||
0e41f715 JB |
919 | memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN); |
920 | ||
921 | /* | |
922 | * The ssid_len setting below is used to see whether | |
923 | * we are active, and we need all other settings | |
924 | * before that may get visible. | |
925 | */ | |
926 | mb(); | |
927 | ||
928 | sdata->u.ibss.ssid_len = params->ssid_len; | |
929 | ||
5cff20e6 JB |
930 | ieee80211_recalc_idle(sdata->local); |
931 | ||
af8cdcd8 | 932 | set_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request); |
42935eca | 933 | ieee80211_queue_work(&sdata->local->hw, &sdata->u.ibss.work); |
af8cdcd8 JB |
934 | |
935 | return 0; | |
936 | } | |
937 | ||
938 | int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) | |
939 | { | |
940 | struct sk_buff *skb; | |
941 | ||
942 | del_timer_sync(&sdata->u.ibss.timer); | |
943 | clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request); | |
944 | cancel_work_sync(&sdata->u.ibss.work); | |
945 | clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request); | |
946 | ||
947 | sta_info_flush(sdata->local, sdata); | |
948 | ||
949 | /* remove beacon */ | |
950 | kfree(sdata->u.ibss.ie); | |
951 | skb = sdata->u.ibss.presp; | |
952 | rcu_assign_pointer(sdata->u.ibss.presp, NULL); | |
2d0ddec5 | 953 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED); |
af8cdcd8 JB |
954 | synchronize_rcu(); |
955 | kfree_skb(skb); | |
956 | ||
957 | skb_queue_purge(&sdata->u.ibss.skb_queue); | |
958 | memset(sdata->u.ibss.bssid, 0, ETH_ALEN); | |
5cff20e6 JB |
959 | sdata->u.ibss.ssid_len = 0; |
960 | ||
961 | ieee80211_recalc_idle(sdata->local); | |
af8cdcd8 JB |
962 | |
963 | return 0; | |
964 | } |