]>
Commit | Line | Data |
---|---|---|
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 | ||
7a17a33c JB |
46 | lockdep_assert_held(&sdata->u.ibss.mtx); |
47 | ||
46900298 JB |
48 | if (len < 24 + 6) |
49 | return; | |
50 | ||
51 | auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); | |
52 | auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); | |
53 | status_code = le16_to_cpu(mgmt->u.auth.status_code); | |
54 | ||
55 | /* | |
56 | * IEEE 802.11 standard does not require authentication in IBSS | |
57 | * networks and most implementations do not seem to use it. | |
58 | * However, try to reply to authentication attempts if someone | |
59 | * has actually implemented this. | |
60 | */ | |
61 | if (auth_alg == WLAN_AUTH_OPEN && auth_transaction == 1) | |
62 | ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, NULL, 0, | |
fffd0934 | 63 | sdata->u.ibss.bssid, NULL, 0, 0); |
46900298 JB |
64 | } |
65 | ||
af8cdcd8 JB |
66 | static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
67 | const u8 *bssid, const int beacon_int, | |
68 | struct ieee80211_channel *chan, | |
b59066a2 | 69 | const u32 basic_rates, |
af8cdcd8 | 70 | const u16 capability, u64 tsf) |
46900298 JB |
71 | { |
72 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
73 | struct ieee80211_local *local = sdata->local; | |
b59066a2 | 74 | int rates, i; |
46900298 JB |
75 | struct sk_buff *skb; |
76 | struct ieee80211_mgmt *mgmt; | |
77 | u8 *pos; | |
78 | struct ieee80211_supported_band *sband; | |
f446d10f | 79 | struct cfg80211_bss *bss; |
57c4d7b4 | 80 | u32 bss_change; |
b59066a2 | 81 | u8 supp_rates[IEEE80211_MAX_SUPP_RATES]; |
24487981 | 82 | |
7a17a33c JB |
83 | lockdep_assert_held(&ifibss->mtx); |
84 | ||
24487981 JB |
85 | /* Reset own TSF to allow time synchronization work. */ |
86 | drv_reset_tsf(local); | |
46900298 | 87 | |
af8cdcd8 JB |
88 | skb = ifibss->skb; |
89 | rcu_assign_pointer(ifibss->presp, NULL); | |
90 | synchronize_rcu(); | |
91 | skb->data = skb->head; | |
92 | skb->len = 0; | |
93 | skb_reset_tail_pointer(skb); | |
94 | skb_reserve(skb, sdata->local->hw.extra_tx_headroom); | |
46900298 | 95 | |
af8cdcd8 JB |
96 | if (memcmp(ifibss->bssid, bssid, ETH_ALEN)) |
97 | sta_info_flush(sdata->local, sdata); | |
46900298 | 98 | |
49b5c7f4 JB |
99 | /* if merging, indicate to driver that we leave the old IBSS */ |
100 | if (sdata->vif.bss_conf.ibss_joined) { | |
101 | sdata->vif.bss_conf.ibss_joined = false; | |
102 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IBSS); | |
103 | } | |
104 | ||
46900298 | 105 | memcpy(ifibss->bssid, bssid, ETH_ALEN); |
46900298 | 106 | |
af8cdcd8 | 107 | sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0; |
46900298 | 108 | |
af8cdcd8 | 109 | local->oper_channel = chan; |
0aaffa9b | 110 | WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT)); |
af8cdcd8 | 111 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); |
57c4d7b4 | 112 | |
af8cdcd8 | 113 | sband = local->hw.wiphy->bands[chan->band]; |
46900298 | 114 | |
b59066a2 JB |
115 | /* build supported rates array */ |
116 | pos = supp_rates; | |
117 | for (i = 0; i < sband->n_bitrates; i++) { | |
118 | int rate = sband->bitrates[i].bitrate; | |
119 | u8 basic = 0; | |
120 | if (basic_rates & BIT(i)) | |
121 | basic = 0x80; | |
122 | *pos++ = basic | (u8) (rate / 5); | |
123 | } | |
124 | ||
46900298 | 125 | /* Build IBSS probe response */ |
af8cdcd8 | 126 | mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon)); |
46900298 JB |
127 | memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon)); |
128 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | | |
129 | IEEE80211_STYPE_PROBE_RESP); | |
130 | memset(mgmt->da, 0xff, ETH_ALEN); | |
47846c9b | 131 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
46900298 | 132 | memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN); |
57c4d7b4 | 133 | mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int); |
707c1b4e | 134 | mgmt->u.beacon.timestamp = cpu_to_le64(tsf); |
46900298 JB |
135 | mgmt->u.beacon.capab_info = cpu_to_le16(capability); |
136 | ||
137 | pos = skb_put(skb, 2 + ifibss->ssid_len); | |
138 | *pos++ = WLAN_EID_SSID; | |
139 | *pos++ = ifibss->ssid_len; | |
140 | memcpy(pos, ifibss->ssid, ifibss->ssid_len); | |
141 | ||
b59066a2 | 142 | rates = sband->n_bitrates; |
46900298 JB |
143 | if (rates > 8) |
144 | rates = 8; | |
145 | pos = skb_put(skb, 2 + rates); | |
146 | *pos++ = WLAN_EID_SUPP_RATES; | |
147 | *pos++ = rates; | |
148 | memcpy(pos, supp_rates, rates); | |
149 | ||
150 | if (sband->band == IEEE80211_BAND_2GHZ) { | |
151 | pos = skb_put(skb, 2 + 1); | |
152 | *pos++ = WLAN_EID_DS_PARAMS; | |
153 | *pos++ = 1; | |
af8cdcd8 | 154 | *pos++ = ieee80211_frequency_to_channel(chan->center_freq); |
46900298 JB |
155 | } |
156 | ||
157 | pos = skb_put(skb, 2 + 2); | |
158 | *pos++ = WLAN_EID_IBSS_PARAMS; | |
159 | *pos++ = 2; | |
160 | /* FIX: set ATIM window based on scan results */ | |
161 | *pos++ = 0; | |
162 | *pos++ = 0; | |
163 | ||
b59066a2 JB |
164 | if (sband->n_bitrates > 8) { |
165 | rates = sband->n_bitrates - 8; | |
46900298 JB |
166 | pos = skb_put(skb, 2 + rates); |
167 | *pos++ = WLAN_EID_EXT_SUPP_RATES; | |
168 | *pos++ = rates; | |
169 | memcpy(pos, &supp_rates[8], rates); | |
170 | } | |
171 | ||
af8cdcd8 JB |
172 | if (ifibss->ie_len) |
173 | memcpy(skb_put(skb, ifibss->ie_len), | |
174 | ifibss->ie, ifibss->ie_len); | |
175 | ||
176 | rcu_assign_pointer(ifibss->presp, skb); | |
46900298 | 177 | |
2d0ddec5 | 178 | sdata->vif.bss_conf.beacon_int = beacon_int; |
fbd2c8dc | 179 | sdata->vif.bss_conf.basic_rates = basic_rates; |
2d0ddec5 JB |
180 | bss_change = BSS_CHANGED_BEACON_INT; |
181 | bss_change |= ieee80211_reset_erp_info(sdata); | |
182 | bss_change |= BSS_CHANGED_BSSID; | |
183 | bss_change |= BSS_CHANGED_BEACON; | |
184 | bss_change |= BSS_CHANGED_BEACON_ENABLED; | |
392cfdb1 | 185 | bss_change |= BSS_CHANGED_BASIC_RATES; |
8fc214ba JB |
186 | bss_change |= BSS_CHANGED_IBSS; |
187 | sdata->vif.bss_conf.ibss_joined = true; | |
2d0ddec5 | 188 | ieee80211_bss_info_change_notify(sdata, bss_change); |
46900298 | 189 | |
b59066a2 | 190 | ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates); |
46900298 | 191 | |
46900298 | 192 | ifibss->state = IEEE80211_IBSS_MLME_JOINED; |
af8cdcd8 JB |
193 | mod_timer(&ifibss->timer, |
194 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 | 195 | |
f446d10f JB |
196 | bss = cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel, |
197 | mgmt, skb->len, 0, GFP_KERNEL); | |
198 | cfg80211_put_bss(bss); | |
af8cdcd8 | 199 | cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL); |
46900298 JB |
200 | } |
201 | ||
af8cdcd8 JB |
202 | static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
203 | struct ieee80211_bss *bss) | |
46900298 | 204 | { |
0c1ad2ca JB |
205 | struct cfg80211_bss *cbss = |
206 | container_of((void *)bss, struct cfg80211_bss, priv); | |
b59066a2 JB |
207 | struct ieee80211_supported_band *sband; |
208 | u32 basic_rates; | |
209 | int i, j; | |
0c1ad2ca | 210 | u16 beacon_int = cbss->beacon_interval; |
57c4d7b4 | 211 | |
7a17a33c JB |
212 | lockdep_assert_held(&sdata->u.ibss.mtx); |
213 | ||
57c4d7b4 JB |
214 | if (beacon_int < 10) |
215 | beacon_int = 10; | |
216 | ||
0c1ad2ca | 217 | sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; |
b59066a2 JB |
218 | |
219 | basic_rates = 0; | |
220 | ||
221 | for (i = 0; i < bss->supp_rates_len; i++) { | |
222 | int rate = (bss->supp_rates[i] & 0x7f) * 5; | |
223 | bool is_basic = !!(bss->supp_rates[i] & 0x80); | |
224 | ||
225 | for (j = 0; j < sband->n_bitrates; j++) { | |
226 | if (sband->bitrates[j].bitrate == rate) { | |
227 | if (is_basic) | |
228 | basic_rates |= BIT(j); | |
229 | break; | |
230 | } | |
231 | } | |
232 | } | |
233 | ||
0c1ad2ca | 234 | __ieee80211_sta_join_ibss(sdata, cbss->bssid, |
57c4d7b4 | 235 | beacon_int, |
0c1ad2ca | 236 | cbss->channel, |
b59066a2 | 237 | basic_rates, |
0c1ad2ca JB |
238 | cbss->capability, |
239 | cbss->tsf); | |
46900298 JB |
240 | } |
241 | ||
242 | static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, | |
243 | struct ieee80211_mgmt *mgmt, | |
244 | size_t len, | |
245 | struct ieee80211_rx_status *rx_status, | |
246 | struct ieee802_11_elems *elems, | |
247 | bool beacon) | |
248 | { | |
249 | struct ieee80211_local *local = sdata->local; | |
250 | int freq; | |
0c1ad2ca | 251 | struct cfg80211_bss *cbss; |
46900298 JB |
252 | struct ieee80211_bss *bss; |
253 | struct sta_info *sta; | |
254 | struct ieee80211_channel *channel; | |
255 | u64 beacon_timestamp, rx_timestamp; | |
256 | u32 supp_rates = 0; | |
257 | enum ieee80211_band band = rx_status->band; | |
258 | ||
259 | if (elems->ds_params && elems->ds_params_len == 1) | |
260 | freq = ieee80211_channel_to_frequency(elems->ds_params[0]); | |
261 | else | |
262 | freq = rx_status->freq; | |
263 | ||
264 | channel = ieee80211_get_channel(local->hw.wiphy, freq); | |
265 | ||
266 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
267 | return; | |
268 | ||
269 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates && | |
270 | memcmp(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) { | |
271 | supp_rates = ieee80211_sta_get_rates(local, elems, band); | |
272 | ||
273 | rcu_read_lock(); | |
274 | ||
abe60632 | 275 | sta = sta_info_get(sdata, mgmt->sa); |
46900298 JB |
276 | if (sta) { |
277 | u32 prev_rates; | |
278 | ||
279 | prev_rates = sta->sta.supp_rates[band]; | |
280 | /* make sure mandatory rates are always added */ | |
281 | sta->sta.supp_rates[band] = supp_rates | | |
282 | ieee80211_mandatory_rates(local, band); | |
283 | ||
09a08cff | 284 | if (sta->sta.supp_rates[band] != prev_rates) { |
46900298 | 285 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
46900298 | 286 | printk(KERN_DEBUG "%s: updated supp_rates set " |
09a08cff BR |
287 | "for %pM based on beacon/probe_response " |
288 | "(0x%x -> 0x%x)\n", | |
289 | sdata->name, sta->sta.addr, | |
290 | prev_rates, sta->sta.supp_rates[band]); | |
46900298 | 291 | #endif |
09a08cff BR |
292 | rate_control_rate_init(sta); |
293 | } | |
34e89507 JB |
294 | rcu_read_unlock(); |
295 | } else { | |
296 | rcu_read_unlock(); | |
297 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, | |
298 | supp_rates, GFP_KERNEL); | |
299 | } | |
46900298 JB |
300 | } |
301 | ||
302 | bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, | |
303 | channel, beacon); | |
304 | if (!bss) | |
305 | return; | |
306 | ||
0c1ad2ca JB |
307 | cbss = container_of((void *)bss, struct cfg80211_bss, priv); |
308 | ||
46900298 | 309 | /* was just updated in ieee80211_bss_info_update */ |
0c1ad2ca | 310 | beacon_timestamp = cbss->tsf; |
46900298 JB |
311 | |
312 | /* check if we need to merge IBSS */ | |
313 | ||
46900298 | 314 | /* we use a fixed BSSID */ |
a98bfec2 | 315 | if (sdata->u.ibss.fixed_bssid) |
46900298 JB |
316 | goto put_bss; |
317 | ||
318 | /* not an IBSS */ | |
0c1ad2ca | 319 | if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) |
46900298 JB |
320 | goto put_bss; |
321 | ||
322 | /* different channel */ | |
0c1ad2ca | 323 | if (cbss->channel != local->oper_channel) |
46900298 JB |
324 | goto put_bss; |
325 | ||
326 | /* different SSID */ | |
327 | if (elems->ssid_len != sdata->u.ibss.ssid_len || | |
328 | memcmp(elems->ssid, sdata->u.ibss.ssid, | |
329 | sdata->u.ibss.ssid_len)) | |
330 | goto put_bss; | |
331 | ||
34e8f082 | 332 | /* same BSSID */ |
0c1ad2ca | 333 | if (memcmp(cbss->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) |
34e8f082 AF |
334 | goto put_bss; |
335 | ||
46900298 JB |
336 | if (rx_status->flag & RX_FLAG_TSFT) { |
337 | /* | |
338 | * For correct IBSS merging we need mactime; since mactime is | |
339 | * defined as the time the first data symbol of the frame hits | |
340 | * the PHY, and the timestamp of the beacon is defined as "the | |
341 | * time that the data symbol containing the first bit of the | |
342 | * timestamp is transmitted to the PHY plus the transmitting | |
343 | * STA's delays through its local PHY from the MAC-PHY | |
344 | * interface to its interface with the WM" (802.11 11.1.2) | |
345 | * - equals the time this bit arrives at the receiver - we have | |
346 | * to take into account the offset between the two. | |
347 | * | |
348 | * E.g. at 1 MBit that means mactime is 192 usec earlier | |
349 | * (=24 bytes * 8 usecs/byte) than the beacon timestamp. | |
350 | */ | |
351 | int rate; | |
352 | ||
353 | if (rx_status->flag & RX_FLAG_HT) | |
354 | rate = 65; /* TODO: HT rates */ | |
355 | else | |
356 | rate = local->hw.wiphy->bands[band]-> | |
357 | bitrates[rx_status->rate_idx].bitrate; | |
358 | ||
359 | rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate); | |
24487981 JB |
360 | } else { |
361 | /* | |
362 | * second best option: get current TSF | |
363 | * (will return -1 if not supported) | |
364 | */ | |
365 | rx_timestamp = drv_get_tsf(local); | |
366 | } | |
46900298 JB |
367 | |
368 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
369 | printk(KERN_DEBUG "RX beacon SA=%pM BSSID=" | |
370 | "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", | |
371 | mgmt->sa, mgmt->bssid, | |
372 | (unsigned long long)rx_timestamp, | |
373 | (unsigned long long)beacon_timestamp, | |
374 | (unsigned long long)(rx_timestamp - beacon_timestamp), | |
375 | jiffies); | |
376 | #endif | |
377 | ||
4a332a38 AF |
378 | /* give slow hardware some time to do the TSF sync */ |
379 | if (rx_timestamp < IEEE80211_IBSS_MERGE_DELAY) | |
380 | goto put_bss; | |
381 | ||
46900298 JB |
382 | if (beacon_timestamp > rx_timestamp) { |
383 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
384 | printk(KERN_DEBUG "%s: beacon TSF higher than " | |
385 | "local TSF - IBSS merge with BSSID %pM\n", | |
47846c9b | 386 | sdata->name, mgmt->bssid); |
46900298 JB |
387 | #endif |
388 | ieee80211_sta_join_ibss(sdata, bss); | |
09a08cff | 389 | supp_rates = ieee80211_sta_get_rates(local, elems, band); |
34e89507 JB |
390 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, |
391 | supp_rates, GFP_KERNEL); | |
46900298 JB |
392 | } |
393 | ||
394 | put_bss: | |
395 | ieee80211_rx_bss_put(local, bss); | |
396 | } | |
397 | ||
398 | /* | |
399 | * Add a new IBSS station, will also be called by the RX code when, | |
400 | * in IBSS mode, receiving a frame from a yet-unknown station, hence | |
401 | * must be callable in atomic context. | |
402 | */ | |
403 | struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, | |
34e89507 JB |
404 | u8 *bssid,u8 *addr, u32 supp_rates, |
405 | gfp_t gfp) | |
46900298 | 406 | { |
2e10d330 | 407 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
46900298 JB |
408 | struct ieee80211_local *local = sdata->local; |
409 | struct sta_info *sta; | |
410 | int band = local->hw.conf.channel->band; | |
411 | ||
af8cdcd8 JB |
412 | /* |
413 | * XXX: Consider removing the least recently used entry and | |
414 | * allow new one to be added. | |
415 | */ | |
46900298 | 416 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { |
af8cdcd8 JB |
417 | if (net_ratelimit()) |
418 | printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n", | |
47846c9b | 419 | sdata->name, addr); |
46900298 JB |
420 | return NULL; |
421 | } | |
422 | ||
2e10d330 FF |
423 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) |
424 | return NULL; | |
425 | ||
46900298 JB |
426 | if (compare_ether_addr(bssid, sdata->u.ibss.bssid)) |
427 | return NULL; | |
428 | ||
429 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
430 | printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n", | |
47846c9b | 431 | wiphy_name(local->hw.wiphy), addr, sdata->name); |
46900298 JB |
432 | #endif |
433 | ||
34e89507 | 434 | sta = sta_info_alloc(sdata, addr, gfp); |
46900298 JB |
435 | if (!sta) |
436 | return NULL; | |
437 | ||
438 | set_sta_flags(sta, WLAN_STA_AUTHORIZED); | |
439 | ||
440 | /* make sure mandatory rates are always added */ | |
441 | sta->sta.supp_rates[band] = supp_rates | | |
442 | ieee80211_mandatory_rates(local, band); | |
443 | ||
444 | rate_control_rate_init(sta); | |
445 | ||
34e89507 | 446 | /* If it fails, maybe we raced another insertion? */ |
46900298 | 447 | if (sta_info_insert(sta)) |
34e89507 | 448 | return sta_info_get(sdata, addr); |
46900298 JB |
449 | return sta; |
450 | } | |
451 | ||
452 | static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) | |
453 | { | |
454 | struct ieee80211_local *local = sdata->local; | |
455 | int active = 0; | |
456 | struct sta_info *sta; | |
457 | ||
7a17a33c JB |
458 | lockdep_assert_held(&sdata->u.ibss.mtx); |
459 | ||
46900298 JB |
460 | rcu_read_lock(); |
461 | ||
462 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
463 | if (sta->sdata == sdata && | |
464 | time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL, | |
465 | jiffies)) { | |
466 | active++; | |
467 | break; | |
468 | } | |
469 | } | |
470 | ||
471 | rcu_read_unlock(); | |
472 | ||
473 | return active; | |
474 | } | |
475 | ||
ce9058ae BP |
476 | /* |
477 | * This function is called with state == IEEE80211_IBSS_MLME_JOINED | |
478 | */ | |
46900298 JB |
479 | |
480 | static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) | |
481 | { | |
482 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
483 | ||
7a17a33c JB |
484 | lockdep_assert_held(&ifibss->mtx); |
485 | ||
af8cdcd8 JB |
486 | mod_timer(&ifibss->timer, |
487 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 JB |
488 | |
489 | ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT); | |
af8cdcd8 | 490 | |
450aae3d S |
491 | if (time_before(jiffies, ifibss->last_scan_completed + |
492 | IEEE80211_IBSS_MERGE_INTERVAL)) | |
493 | return; | |
494 | ||
46900298 JB |
495 | if (ieee80211_sta_active_ibss(sdata)) |
496 | return; | |
497 | ||
af8cdcd8 | 498 | if (ifibss->fixed_channel) |
46900298 JB |
499 | return; |
500 | ||
501 | printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other " | |
47846c9b | 502 | "IBSS networks with same SSID (merge)\n", sdata->name); |
46900298 | 503 | |
be4a4b6a JB |
504 | ieee80211_request_internal_scan(sdata, |
505 | ifibss->ssid, ifibss->ssid_len, | |
506 | ifibss->fixed_channel ? ifibss->channel : NULL); | |
46900298 JB |
507 | } |
508 | ||
af8cdcd8 | 509 | static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
510 | { |
511 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
512 | struct ieee80211_local *local = sdata->local; | |
513 | struct ieee80211_supported_band *sband; | |
46900298 | 514 | u8 bssid[ETH_ALEN]; |
46900298 JB |
515 | u16 capability; |
516 | int i; | |
517 | ||
7a17a33c JB |
518 | lockdep_assert_held(&ifibss->mtx); |
519 | ||
af8cdcd8 | 520 | if (ifibss->fixed_bssid) { |
46900298 JB |
521 | memcpy(bssid, ifibss->bssid, ETH_ALEN); |
522 | } else { | |
523 | /* Generate random, not broadcast, locally administered BSSID. Mix in | |
524 | * own MAC address to make sure that devices that do not have proper | |
525 | * random number generator get different BSSID. */ | |
526 | get_random_bytes(bssid, ETH_ALEN); | |
527 | for (i = 0; i < ETH_ALEN; i++) | |
47846c9b | 528 | bssid[i] ^= sdata->vif.addr[i]; |
46900298 JB |
529 | bssid[0] &= ~0x01; |
530 | bssid[0] |= 0x02; | |
531 | } | |
532 | ||
533 | printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n", | |
47846c9b | 534 | sdata->name, bssid); |
46900298 | 535 | |
af8cdcd8 | 536 | sband = local->hw.wiphy->bands[ifibss->channel->band]; |
46900298 | 537 | |
46900298 JB |
538 | capability = WLAN_CAPABILITY_IBSS; |
539 | ||
fffd0934 | 540 | if (ifibss->privacy) |
46900298 JB |
541 | capability |= WLAN_CAPABILITY_PRIVACY; |
542 | else | |
543 | sdata->drop_unencrypted = 0; | |
544 | ||
57c4d7b4 | 545 | __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, |
fbd2c8dc | 546 | ifibss->channel, ifibss->basic_rates, |
b59066a2 | 547 | capability, 0); |
46900298 JB |
548 | } |
549 | ||
ce9058ae BP |
550 | /* |
551 | * This function is called with state == IEEE80211_IBSS_MLME_SEARCH | |
552 | */ | |
553 | ||
af8cdcd8 | 554 | static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
555 | { |
556 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
557 | struct ieee80211_local *local = sdata->local; | |
0c1ad2ca | 558 | struct cfg80211_bss *cbss; |
af8cdcd8 | 559 | struct ieee80211_channel *chan = NULL; |
46900298 JB |
560 | const u8 *bssid = NULL; |
561 | int active_ibss; | |
e0d61887 | 562 | u16 capability; |
46900298 | 563 | |
7a17a33c JB |
564 | lockdep_assert_held(&ifibss->mtx); |
565 | ||
46900298 JB |
566 | active_ibss = ieee80211_sta_active_ibss(sdata); |
567 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
568 | printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n", | |
47846c9b | 569 | sdata->name, active_ibss); |
46900298 JB |
570 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
571 | ||
572 | if (active_ibss) | |
af8cdcd8 | 573 | return; |
46900298 | 574 | |
e0d61887 | 575 | capability = WLAN_CAPABILITY_IBSS; |
fffd0934 | 576 | if (ifibss->privacy) |
e0d61887 | 577 | capability |= WLAN_CAPABILITY_PRIVACY; |
af8cdcd8 JB |
578 | if (ifibss->fixed_bssid) |
579 | bssid = ifibss->bssid; | |
580 | if (ifibss->fixed_channel) | |
581 | chan = ifibss->channel; | |
582 | if (!is_zero_ether_addr(ifibss->bssid)) | |
46900298 | 583 | bssid = ifibss->bssid; |
0c1ad2ca JB |
584 | cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, |
585 | ifibss->ssid, ifibss->ssid_len, | |
586 | WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY, | |
587 | capability); | |
588 | ||
589 | if (cbss) { | |
590 | struct ieee80211_bss *bss; | |
46900298 | 591 | |
0c1ad2ca | 592 | bss = (void *)cbss->priv; |
46900298 | 593 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
46900298 | 594 | printk(KERN_DEBUG " sta_find_ibss: selected %pM current " |
0c1ad2ca | 595 | "%pM\n", cbss->bssid, ifibss->bssid); |
46900298 JB |
596 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
597 | ||
46900298 JB |
598 | printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM" |
599 | " based on configured SSID\n", | |
0c1ad2ca | 600 | sdata->name, cbss->bssid); |
46900298 | 601 | |
af8cdcd8 | 602 | ieee80211_sta_join_ibss(sdata, bss); |
46900298 | 603 | ieee80211_rx_bss_put(local, bss); |
af8cdcd8 | 604 | return; |
d419b9f0 | 605 | } |
46900298 JB |
606 | |
607 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
608 | printk(KERN_DEBUG " did not try to join ibss\n"); | |
609 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ | |
610 | ||
611 | /* Selected IBSS not found in current scan results - try to scan */ | |
ce9058ae | 612 | if (time_after(jiffies, ifibss->last_scan_completed + |
46900298 JB |
613 | IEEE80211_SCAN_INTERVAL)) { |
614 | printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to " | |
47846c9b | 615 | "join\n", sdata->name); |
46900298 | 616 | |
be4a4b6a JB |
617 | ieee80211_request_internal_scan(sdata, |
618 | ifibss->ssid, ifibss->ssid_len, | |
619 | ifibss->fixed_channel ? ifibss->channel : NULL); | |
ce9058ae | 620 | } else { |
46900298 JB |
621 | int interval = IEEE80211_SCAN_INTERVAL; |
622 | ||
623 | if (time_after(jiffies, ifibss->ibss_join_req + | |
624 | IEEE80211_IBSS_JOIN_TIMEOUT)) { | |
af8cdcd8 JB |
625 | if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) { |
626 | ieee80211_sta_create_ibss(sdata); | |
627 | return; | |
628 | } | |
46900298 | 629 | printk(KERN_DEBUG "%s: IBSS not allowed on" |
47846c9b | 630 | " %d MHz\n", sdata->name, |
46900298 JB |
631 | local->hw.conf.channel->center_freq); |
632 | ||
633 | /* No IBSS found - decrease scan interval and continue | |
634 | * scanning. */ | |
635 | interval = IEEE80211_SCAN_INTERVAL_SLOW; | |
636 | } | |
637 | ||
af8cdcd8 JB |
638 | mod_timer(&ifibss->timer, |
639 | round_jiffies(jiffies + interval)); | |
46900298 | 640 | } |
46900298 JB |
641 | } |
642 | ||
643 | static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, | |
644 | struct ieee80211_mgmt *mgmt, | |
645 | size_t len) | |
646 | { | |
647 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
648 | struct ieee80211_local *local = sdata->local; | |
649 | int tx_last_beacon; | |
650 | struct sk_buff *skb; | |
651 | struct ieee80211_mgmt *resp; | |
652 | u8 *pos, *end; | |
653 | ||
7a17a33c JB |
654 | lockdep_assert_held(&ifibss->mtx); |
655 | ||
46900298 | 656 | if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || |
af8cdcd8 | 657 | len < 24 + 2 || !ifibss->presp) |
46900298 JB |
658 | return; |
659 | ||
24487981 | 660 | tx_last_beacon = drv_tx_last_beacon(local); |
46900298 JB |
661 | |
662 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
663 | printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM" | |
664 | " (tx_last_beacon=%d)\n", | |
47846c9b | 665 | sdata->name, mgmt->sa, mgmt->da, |
46900298 JB |
666 | mgmt->bssid, tx_last_beacon); |
667 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ | |
668 | ||
669 | if (!tx_last_beacon) | |
670 | return; | |
671 | ||
672 | if (memcmp(mgmt->bssid, ifibss->bssid, ETH_ALEN) != 0 && | |
673 | memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0) | |
674 | return; | |
675 | ||
676 | end = ((u8 *) mgmt) + len; | |
677 | pos = mgmt->u.probe_req.variable; | |
678 | if (pos[0] != WLAN_EID_SSID || | |
679 | pos + 2 + pos[1] > end) { | |
680 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
681 | printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq " | |
682 | "from %pM\n", | |
47846c9b | 683 | sdata->name, mgmt->sa); |
46900298 JB |
684 | #endif |
685 | return; | |
686 | } | |
687 | if (pos[1] != 0 && | |
688 | (pos[1] != ifibss->ssid_len || | |
0da780c2 | 689 | memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { |
46900298 JB |
690 | /* Ignore ProbeReq for foreign SSID */ |
691 | return; | |
692 | } | |
693 | ||
694 | /* Reply with ProbeResp */ | |
af8cdcd8 | 695 | skb = skb_copy(ifibss->presp, GFP_KERNEL); |
46900298 JB |
696 | if (!skb) |
697 | return; | |
698 | ||
699 | resp = (struct ieee80211_mgmt *) skb->data; | |
700 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
701 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
702 | printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n", | |
47846c9b | 703 | sdata->name, resp->da); |
46900298 | 704 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
62ae67be JB |
705 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
706 | ieee80211_tx_skb(sdata, skb); | |
46900298 JB |
707 | } |
708 | ||
709 | static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, | |
710 | struct ieee80211_mgmt *mgmt, | |
711 | size_t len, | |
712 | struct ieee80211_rx_status *rx_status) | |
713 | { | |
714 | size_t baselen; | |
715 | struct ieee802_11_elems elems; | |
716 | ||
47846c9b | 717 | if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN)) |
46900298 JB |
718 | return; /* ignore ProbeResp to foreign address */ |
719 | ||
720 | baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; | |
721 | if (baselen > len) | |
722 | return; | |
723 | ||
724 | ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, | |
725 | &elems); | |
726 | ||
727 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); | |
728 | } | |
729 | ||
730 | static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, | |
731 | struct ieee80211_mgmt *mgmt, | |
732 | size_t len, | |
733 | struct ieee80211_rx_status *rx_status) | |
734 | { | |
735 | size_t baselen; | |
736 | struct ieee802_11_elems elems; | |
737 | ||
738 | /* Process beacon from the current BSS */ | |
739 | baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; | |
740 | if (baselen > len) | |
741 | return; | |
742 | ||
743 | ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems); | |
744 | ||
745 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true); | |
746 | } | |
747 | ||
1fa57d01 JB |
748 | void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, |
749 | struct sk_buff *skb) | |
46900298 JB |
750 | { |
751 | struct ieee80211_rx_status *rx_status; | |
752 | struct ieee80211_mgmt *mgmt; | |
753 | u16 fc; | |
754 | ||
f1d58c25 | 755 | rx_status = IEEE80211_SKB_RXCB(skb); |
46900298 JB |
756 | mgmt = (struct ieee80211_mgmt *) skb->data; |
757 | fc = le16_to_cpu(mgmt->frame_control); | |
758 | ||
7a17a33c JB |
759 | mutex_lock(&sdata->u.ibss.mtx); |
760 | ||
46900298 JB |
761 | switch (fc & IEEE80211_FCTL_STYPE) { |
762 | case IEEE80211_STYPE_PROBE_REQ: | |
763 | ieee80211_rx_mgmt_probe_req(sdata, mgmt, skb->len); | |
764 | break; | |
765 | case IEEE80211_STYPE_PROBE_RESP: | |
766 | ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, | |
767 | rx_status); | |
768 | break; | |
769 | case IEEE80211_STYPE_BEACON: | |
770 | ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, | |
771 | rx_status); | |
772 | break; | |
773 | case IEEE80211_STYPE_AUTH: | |
774 | ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); | |
775 | break; | |
776 | } | |
7a17a33c JB |
777 | |
778 | mutex_unlock(&sdata->u.ibss.mtx); | |
46900298 JB |
779 | } |
780 | ||
1fa57d01 | 781 | void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) |
46900298 | 782 | { |
1fa57d01 | 783 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
46900298 | 784 | |
7a17a33c JB |
785 | mutex_lock(&ifibss->mtx); |
786 | ||
787 | /* | |
788 | * Work could be scheduled after scan or similar | |
789 | * when we aren't even joined (or trying) with a | |
790 | * network. | |
791 | */ | |
792 | if (!ifibss->ssid_len) | |
793 | goto out; | |
46900298 JB |
794 | |
795 | switch (ifibss->state) { | |
796 | case IEEE80211_IBSS_MLME_SEARCH: | |
797 | ieee80211_sta_find_ibss(sdata); | |
798 | break; | |
799 | case IEEE80211_IBSS_MLME_JOINED: | |
800 | ieee80211_sta_merge_ibss(sdata); | |
801 | break; | |
802 | default: | |
803 | WARN_ON(1); | |
804 | break; | |
805 | } | |
46900298 | 806 | |
7a17a33c JB |
807 | out: |
808 | mutex_unlock(&ifibss->mtx); | |
3a4d4aa2 JB |
809 | } |
810 | ||
46900298 JB |
811 | static void ieee80211_ibss_timer(unsigned long data) |
812 | { | |
813 | struct ieee80211_sub_if_data *sdata = | |
814 | (struct ieee80211_sub_if_data *) data; | |
815 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
816 | struct ieee80211_local *local = sdata->local; | |
817 | ||
5bb644a0 JB |
818 | if (local->quiescing) { |
819 | ifibss->timer_running = true; | |
820 | return; | |
821 | } | |
822 | ||
7a17a33c | 823 | ieee80211_queue_work(&local->hw, &sdata->work); |
46900298 JB |
824 | } |
825 | ||
5bb644a0 JB |
826 | #ifdef CONFIG_PM |
827 | void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata) | |
828 | { | |
829 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
830 | ||
5bb644a0 JB |
831 | if (del_timer_sync(&ifibss->timer)) |
832 | ifibss->timer_running = true; | |
833 | } | |
834 | ||
835 | void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata) | |
836 | { | |
837 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
838 | ||
839 | if (ifibss->timer_running) { | |
840 | add_timer(&ifibss->timer); | |
841 | ifibss->timer_running = false; | |
842 | } | |
843 | } | |
844 | #endif | |
845 | ||
46900298 JB |
846 | void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) |
847 | { | |
848 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
849 | ||
46900298 JB |
850 | setup_timer(&ifibss->timer, ieee80211_ibss_timer, |
851 | (unsigned long) sdata); | |
7a17a33c | 852 | mutex_init(&ifibss->mtx); |
46900298 JB |
853 | } |
854 | ||
855 | /* scan finished notification */ | |
856 | void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) | |
857 | { | |
af8cdcd8 | 858 | struct ieee80211_sub_if_data *sdata; |
46900298 | 859 | |
29b4a4f7 JB |
860 | mutex_lock(&local->iflist_mtx); |
861 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 862 | if (!ieee80211_sdata_running(sdata)) |
0e41f715 | 863 | continue; |
af8cdcd8 JB |
864 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
865 | continue; | |
866 | sdata->u.ibss.last_scan_completed = jiffies; | |
7a17a33c | 867 | ieee80211_queue_work(&local->hw, &sdata->work); |
46900298 | 868 | } |
29b4a4f7 | 869 | mutex_unlock(&local->iflist_mtx); |
46900298 JB |
870 | } |
871 | ||
af8cdcd8 JB |
872 | int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, |
873 | struct cfg80211_ibss_params *params) | |
874 | { | |
875 | struct sk_buff *skb; | |
876 | ||
7a17a33c JB |
877 | skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + |
878 | 36 /* bitrates */ + | |
879 | 34 /* SSID */ + | |
880 | 3 /* DS params */ + | |
881 | 4 /* IBSS params */ + | |
882 | params->ie_len); | |
883 | if (!skb) | |
884 | return -ENOMEM; | |
885 | ||
886 | mutex_lock(&sdata->u.ibss.mtx); | |
887 | ||
af8cdcd8 JB |
888 | if (params->bssid) { |
889 | memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); | |
890 | sdata->u.ibss.fixed_bssid = true; | |
891 | } else | |
892 | sdata->u.ibss.fixed_bssid = false; | |
893 | ||
fffd0934 | 894 | sdata->u.ibss.privacy = params->privacy; |
fbd2c8dc | 895 | sdata->u.ibss.basic_rates = params->basic_rates; |
fffd0934 | 896 | |
57c4d7b4 JB |
897 | sdata->vif.bss_conf.beacon_int = params->beacon_interval; |
898 | ||
af8cdcd8 JB |
899 | sdata->u.ibss.channel = params->channel; |
900 | sdata->u.ibss.fixed_channel = params->channel_fixed; | |
901 | ||
adfba3c7 JB |
902 | /* fix ourselves to that channel now already */ |
903 | if (params->channel_fixed) { | |
904 | sdata->local->oper_channel = params->channel; | |
0aaffa9b JB |
905 | WARN_ON(!ieee80211_set_channel_type(sdata->local, sdata, |
906 | NL80211_CHAN_NO_HT)); | |
adfba3c7 JB |
907 | } |
908 | ||
af8cdcd8 JB |
909 | if (params->ie) { |
910 | sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, | |
911 | GFP_KERNEL); | |
912 | if (sdata->u.ibss.ie) | |
913 | sdata->u.ibss.ie_len = params->ie_len; | |
914 | } | |
915 | ||
af8cdcd8 JB |
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 | 920 | memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN); |
0e41f715 JB |
921 | sdata->u.ibss.ssid_len = params->ssid_len; |
922 | ||
5cff20e6 JB |
923 | ieee80211_recalc_idle(sdata->local); |
924 | ||
64592c8f | 925 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
af8cdcd8 | 926 | |
7a17a33c JB |
927 | mutex_unlock(&sdata->u.ibss.mtx); |
928 | ||
af8cdcd8 JB |
929 | return 0; |
930 | } | |
931 | ||
932 | int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) | |
933 | { | |
934 | struct sk_buff *skb; | |
5ea096c0 TP |
935 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
936 | struct ieee80211_local *local = sdata->local; | |
937 | struct cfg80211_bss *cbss; | |
938 | u16 capability; | |
7a17a33c JB |
939 | int active_ibss; |
940 | ||
941 | mutex_lock(&sdata->u.ibss.mtx); | |
5ea096c0 TP |
942 | |
943 | active_ibss = ieee80211_sta_active_ibss(sdata); | |
944 | ||
945 | if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) { | |
946 | capability = WLAN_CAPABILITY_IBSS; | |
947 | ||
948 | if (ifibss->privacy) | |
949 | capability |= WLAN_CAPABILITY_PRIVACY; | |
950 | ||
951 | cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->channel, | |
952 | ifibss->bssid, ifibss->ssid, | |
953 | ifibss->ssid_len, WLAN_CAPABILITY_IBSS | | |
954 | WLAN_CAPABILITY_PRIVACY, | |
955 | capability); | |
956 | ||
957 | if (cbss) { | |
958 | cfg80211_unlink_bss(local->hw.wiphy, cbss); | |
959 | cfg80211_put_bss(cbss); | |
960 | } | |
961 | } | |
af8cdcd8 | 962 | |
af8cdcd8 JB |
963 | sta_info_flush(sdata->local, sdata); |
964 | ||
965 | /* remove beacon */ | |
966 | kfree(sdata->u.ibss.ie); | |
967 | skb = sdata->u.ibss.presp; | |
968 | rcu_assign_pointer(sdata->u.ibss.presp, NULL); | |
8fc214ba JB |
969 | sdata->vif.bss_conf.ibss_joined = false; |
970 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | | |
971 | BSS_CHANGED_IBSS); | |
af8cdcd8 JB |
972 | synchronize_rcu(); |
973 | kfree_skb(skb); | |
974 | ||
35f20c14 | 975 | skb_queue_purge(&sdata->skb_queue); |
af8cdcd8 | 976 | memset(sdata->u.ibss.bssid, 0, ETH_ALEN); |
5cff20e6 JB |
977 | sdata->u.ibss.ssid_len = 0; |
978 | ||
bc05d19f | 979 | del_timer_sync(&sdata->u.ibss.timer); |
7a17a33c JB |
980 | |
981 | mutex_unlock(&sdata->u.ibss.mtx); | |
bc05d19f | 982 | |
5cff20e6 | 983 | ieee80211_recalc_idle(sdata->local); |
af8cdcd8 JB |
984 | |
985 | return 0; | |
986 | } |