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 | 93 | |
49b5c7f4 JB |
94 | /* if merging, indicate to driver that we leave the old IBSS */ |
95 | if (sdata->vif.bss_conf.ibss_joined) { | |
96 | sdata->vif.bss_conf.ibss_joined = false; | |
97 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IBSS); | |
98 | } | |
99 | ||
46900298 | 100 | memcpy(ifibss->bssid, bssid, ETH_ALEN); |
46900298 | 101 | |
af8cdcd8 | 102 | sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0; |
46900298 | 103 | |
af8cdcd8 JB |
104 | local->oper_channel = chan; |
105 | local->oper_channel_type = NL80211_CHAN_NO_HT; | |
106 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); | |
57c4d7b4 | 107 | |
af8cdcd8 | 108 | sband = local->hw.wiphy->bands[chan->band]; |
46900298 | 109 | |
b59066a2 JB |
110 | /* build supported rates array */ |
111 | pos = supp_rates; | |
112 | for (i = 0; i < sband->n_bitrates; i++) { | |
113 | int rate = sband->bitrates[i].bitrate; | |
114 | u8 basic = 0; | |
115 | if (basic_rates & BIT(i)) | |
116 | basic = 0x80; | |
117 | *pos++ = basic | (u8) (rate / 5); | |
118 | } | |
119 | ||
46900298 | 120 | /* Build IBSS probe response */ |
af8cdcd8 | 121 | mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon)); |
46900298 JB |
122 | memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon)); |
123 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | | |
124 | IEEE80211_STYPE_PROBE_RESP); | |
125 | memset(mgmt->da, 0xff, ETH_ALEN); | |
47846c9b | 126 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
46900298 | 127 | memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN); |
57c4d7b4 | 128 | mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int); |
707c1b4e | 129 | mgmt->u.beacon.timestamp = cpu_to_le64(tsf); |
46900298 JB |
130 | mgmt->u.beacon.capab_info = cpu_to_le16(capability); |
131 | ||
132 | pos = skb_put(skb, 2 + ifibss->ssid_len); | |
133 | *pos++ = WLAN_EID_SSID; | |
134 | *pos++ = ifibss->ssid_len; | |
135 | memcpy(pos, ifibss->ssid, ifibss->ssid_len); | |
136 | ||
b59066a2 | 137 | rates = sband->n_bitrates; |
46900298 JB |
138 | if (rates > 8) |
139 | rates = 8; | |
140 | pos = skb_put(skb, 2 + rates); | |
141 | *pos++ = WLAN_EID_SUPP_RATES; | |
142 | *pos++ = rates; | |
143 | memcpy(pos, supp_rates, rates); | |
144 | ||
145 | if (sband->band == IEEE80211_BAND_2GHZ) { | |
146 | pos = skb_put(skb, 2 + 1); | |
147 | *pos++ = WLAN_EID_DS_PARAMS; | |
148 | *pos++ = 1; | |
af8cdcd8 | 149 | *pos++ = ieee80211_frequency_to_channel(chan->center_freq); |
46900298 JB |
150 | } |
151 | ||
152 | pos = skb_put(skb, 2 + 2); | |
153 | *pos++ = WLAN_EID_IBSS_PARAMS; | |
154 | *pos++ = 2; | |
155 | /* FIX: set ATIM window based on scan results */ | |
156 | *pos++ = 0; | |
157 | *pos++ = 0; | |
158 | ||
b59066a2 JB |
159 | if (sband->n_bitrates > 8) { |
160 | rates = sband->n_bitrates - 8; | |
46900298 JB |
161 | pos = skb_put(skb, 2 + rates); |
162 | *pos++ = WLAN_EID_EXT_SUPP_RATES; | |
163 | *pos++ = rates; | |
164 | memcpy(pos, &supp_rates[8], rates); | |
165 | } | |
166 | ||
af8cdcd8 JB |
167 | if (ifibss->ie_len) |
168 | memcpy(skb_put(skb, ifibss->ie_len), | |
169 | ifibss->ie, ifibss->ie_len); | |
170 | ||
171 | rcu_assign_pointer(ifibss->presp, skb); | |
46900298 | 172 | |
2d0ddec5 JB |
173 | sdata->vif.bss_conf.beacon_int = beacon_int; |
174 | bss_change = BSS_CHANGED_BEACON_INT; | |
175 | bss_change |= ieee80211_reset_erp_info(sdata); | |
176 | bss_change |= BSS_CHANGED_BSSID; | |
177 | bss_change |= BSS_CHANGED_BEACON; | |
178 | bss_change |= BSS_CHANGED_BEACON_ENABLED; | |
8fc214ba JB |
179 | bss_change |= BSS_CHANGED_IBSS; |
180 | sdata->vif.bss_conf.ibss_joined = true; | |
2d0ddec5 | 181 | ieee80211_bss_info_change_notify(sdata, bss_change); |
46900298 | 182 | |
b59066a2 | 183 | ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates); |
46900298 | 184 | |
46900298 | 185 | ifibss->state = IEEE80211_IBSS_MLME_JOINED; |
af8cdcd8 JB |
186 | mod_timer(&ifibss->timer, |
187 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 | 188 | |
f446d10f JB |
189 | bss = cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel, |
190 | mgmt, skb->len, 0, GFP_KERNEL); | |
191 | cfg80211_put_bss(bss); | |
af8cdcd8 | 192 | cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL); |
46900298 JB |
193 | } |
194 | ||
af8cdcd8 JB |
195 | static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
196 | struct ieee80211_bss *bss) | |
46900298 | 197 | { |
0c1ad2ca JB |
198 | struct cfg80211_bss *cbss = |
199 | container_of((void *)bss, struct cfg80211_bss, priv); | |
b59066a2 JB |
200 | struct ieee80211_supported_band *sband; |
201 | u32 basic_rates; | |
202 | int i, j; | |
0c1ad2ca | 203 | u16 beacon_int = cbss->beacon_interval; |
57c4d7b4 JB |
204 | |
205 | if (beacon_int < 10) | |
206 | beacon_int = 10; | |
207 | ||
0c1ad2ca | 208 | sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; |
b59066a2 JB |
209 | |
210 | basic_rates = 0; | |
211 | ||
212 | for (i = 0; i < bss->supp_rates_len; i++) { | |
213 | int rate = (bss->supp_rates[i] & 0x7f) * 5; | |
214 | bool is_basic = !!(bss->supp_rates[i] & 0x80); | |
215 | ||
216 | for (j = 0; j < sband->n_bitrates; j++) { | |
217 | if (sband->bitrates[j].bitrate == rate) { | |
218 | if (is_basic) | |
219 | basic_rates |= BIT(j); | |
220 | break; | |
221 | } | |
222 | } | |
223 | } | |
224 | ||
0c1ad2ca | 225 | __ieee80211_sta_join_ibss(sdata, cbss->bssid, |
57c4d7b4 | 226 | beacon_int, |
0c1ad2ca | 227 | cbss->channel, |
b59066a2 | 228 | basic_rates, |
0c1ad2ca JB |
229 | cbss->capability, |
230 | cbss->tsf); | |
46900298 JB |
231 | } |
232 | ||
233 | static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, | |
234 | struct ieee80211_mgmt *mgmt, | |
235 | size_t len, | |
236 | struct ieee80211_rx_status *rx_status, | |
237 | struct ieee802_11_elems *elems, | |
238 | bool beacon) | |
239 | { | |
240 | struct ieee80211_local *local = sdata->local; | |
241 | int freq; | |
0c1ad2ca | 242 | struct cfg80211_bss *cbss; |
46900298 JB |
243 | struct ieee80211_bss *bss; |
244 | struct sta_info *sta; | |
245 | struct ieee80211_channel *channel; | |
246 | u64 beacon_timestamp, rx_timestamp; | |
247 | u32 supp_rates = 0; | |
248 | enum ieee80211_band band = rx_status->band; | |
249 | ||
250 | if (elems->ds_params && elems->ds_params_len == 1) | |
251 | freq = ieee80211_channel_to_frequency(elems->ds_params[0]); | |
252 | else | |
253 | freq = rx_status->freq; | |
254 | ||
255 | channel = ieee80211_get_channel(local->hw.wiphy, freq); | |
256 | ||
257 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
258 | return; | |
259 | ||
260 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates && | |
261 | memcmp(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) { | |
262 | supp_rates = ieee80211_sta_get_rates(local, elems, band); | |
263 | ||
264 | rcu_read_lock(); | |
265 | ||
abe60632 | 266 | sta = sta_info_get(sdata, mgmt->sa); |
46900298 JB |
267 | if (sta) { |
268 | u32 prev_rates; | |
269 | ||
270 | prev_rates = sta->sta.supp_rates[band]; | |
271 | /* make sure mandatory rates are always added */ | |
272 | sta->sta.supp_rates[band] = supp_rates | | |
273 | ieee80211_mandatory_rates(local, band); | |
274 | ||
09a08cff | 275 | if (sta->sta.supp_rates[band] != prev_rates) { |
46900298 | 276 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
46900298 | 277 | printk(KERN_DEBUG "%s: updated supp_rates set " |
09a08cff BR |
278 | "for %pM based on beacon/probe_response " |
279 | "(0x%x -> 0x%x)\n", | |
280 | sdata->name, sta->sta.addr, | |
281 | prev_rates, sta->sta.supp_rates[band]); | |
46900298 | 282 | #endif |
09a08cff BR |
283 | rate_control_rate_init(sta); |
284 | } | |
34e89507 JB |
285 | rcu_read_unlock(); |
286 | } else { | |
287 | rcu_read_unlock(); | |
288 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, | |
289 | supp_rates, GFP_KERNEL); | |
290 | } | |
46900298 JB |
291 | } |
292 | ||
293 | bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, | |
294 | channel, beacon); | |
295 | if (!bss) | |
296 | return; | |
297 | ||
0c1ad2ca JB |
298 | cbss = container_of((void *)bss, struct cfg80211_bss, priv); |
299 | ||
46900298 | 300 | /* was just updated in ieee80211_bss_info_update */ |
0c1ad2ca | 301 | beacon_timestamp = cbss->tsf; |
46900298 JB |
302 | |
303 | /* check if we need to merge IBSS */ | |
304 | ||
46900298 | 305 | /* we use a fixed BSSID */ |
a98bfec2 | 306 | if (sdata->u.ibss.fixed_bssid) |
46900298 JB |
307 | goto put_bss; |
308 | ||
309 | /* not an IBSS */ | |
0c1ad2ca | 310 | if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) |
46900298 JB |
311 | goto put_bss; |
312 | ||
313 | /* different channel */ | |
0c1ad2ca | 314 | if (cbss->channel != local->oper_channel) |
46900298 JB |
315 | goto put_bss; |
316 | ||
317 | /* different SSID */ | |
318 | if (elems->ssid_len != sdata->u.ibss.ssid_len || | |
319 | memcmp(elems->ssid, sdata->u.ibss.ssid, | |
320 | sdata->u.ibss.ssid_len)) | |
321 | goto put_bss; | |
322 | ||
34e8f082 | 323 | /* same BSSID */ |
0c1ad2ca | 324 | if (memcmp(cbss->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) |
34e8f082 AF |
325 | goto put_bss; |
326 | ||
46900298 JB |
327 | if (rx_status->flag & RX_FLAG_TSFT) { |
328 | /* | |
329 | * For correct IBSS merging we need mactime; since mactime is | |
330 | * defined as the time the first data symbol of the frame hits | |
331 | * the PHY, and the timestamp of the beacon is defined as "the | |
332 | * time that the data symbol containing the first bit of the | |
333 | * timestamp is transmitted to the PHY plus the transmitting | |
334 | * STA's delays through its local PHY from the MAC-PHY | |
335 | * interface to its interface with the WM" (802.11 11.1.2) | |
336 | * - equals the time this bit arrives at the receiver - we have | |
337 | * to take into account the offset between the two. | |
338 | * | |
339 | * E.g. at 1 MBit that means mactime is 192 usec earlier | |
340 | * (=24 bytes * 8 usecs/byte) than the beacon timestamp. | |
341 | */ | |
342 | int rate; | |
343 | ||
344 | if (rx_status->flag & RX_FLAG_HT) | |
345 | rate = 65; /* TODO: HT rates */ | |
346 | else | |
347 | rate = local->hw.wiphy->bands[band]-> | |
348 | bitrates[rx_status->rate_idx].bitrate; | |
349 | ||
350 | rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate); | |
24487981 JB |
351 | } else { |
352 | /* | |
353 | * second best option: get current TSF | |
354 | * (will return -1 if not supported) | |
355 | */ | |
356 | rx_timestamp = drv_get_tsf(local); | |
357 | } | |
46900298 JB |
358 | |
359 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
360 | printk(KERN_DEBUG "RX beacon SA=%pM BSSID=" | |
361 | "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", | |
362 | mgmt->sa, mgmt->bssid, | |
363 | (unsigned long long)rx_timestamp, | |
364 | (unsigned long long)beacon_timestamp, | |
365 | (unsigned long long)(rx_timestamp - beacon_timestamp), | |
366 | jiffies); | |
367 | #endif | |
368 | ||
4a332a38 AF |
369 | /* give slow hardware some time to do the TSF sync */ |
370 | if (rx_timestamp < IEEE80211_IBSS_MERGE_DELAY) | |
371 | goto put_bss; | |
372 | ||
46900298 JB |
373 | if (beacon_timestamp > rx_timestamp) { |
374 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
375 | printk(KERN_DEBUG "%s: beacon TSF higher than " | |
376 | "local TSF - IBSS merge with BSSID %pM\n", | |
47846c9b | 377 | sdata->name, mgmt->bssid); |
46900298 JB |
378 | #endif |
379 | ieee80211_sta_join_ibss(sdata, bss); | |
09a08cff | 380 | supp_rates = ieee80211_sta_get_rates(local, elems, band); |
34e89507 JB |
381 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, |
382 | supp_rates, GFP_KERNEL); | |
46900298 JB |
383 | } |
384 | ||
385 | put_bss: | |
386 | ieee80211_rx_bss_put(local, bss); | |
387 | } | |
388 | ||
389 | /* | |
390 | * Add a new IBSS station, will also be called by the RX code when, | |
391 | * in IBSS mode, receiving a frame from a yet-unknown station, hence | |
392 | * must be callable in atomic context. | |
393 | */ | |
394 | struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, | |
34e89507 JB |
395 | u8 *bssid,u8 *addr, u32 supp_rates, |
396 | gfp_t gfp) | |
46900298 | 397 | { |
2e10d330 | 398 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
46900298 JB |
399 | struct ieee80211_local *local = sdata->local; |
400 | struct sta_info *sta; | |
401 | int band = local->hw.conf.channel->band; | |
402 | ||
af8cdcd8 JB |
403 | /* |
404 | * XXX: Consider removing the least recently used entry and | |
405 | * allow new one to be added. | |
406 | */ | |
46900298 | 407 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { |
af8cdcd8 JB |
408 | if (net_ratelimit()) |
409 | printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n", | |
47846c9b | 410 | sdata->name, addr); |
46900298 JB |
411 | return NULL; |
412 | } | |
413 | ||
2e10d330 FF |
414 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) |
415 | return NULL; | |
416 | ||
46900298 JB |
417 | if (compare_ether_addr(bssid, sdata->u.ibss.bssid)) |
418 | return NULL; | |
419 | ||
420 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
421 | printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n", | |
47846c9b | 422 | wiphy_name(local->hw.wiphy), addr, sdata->name); |
46900298 JB |
423 | #endif |
424 | ||
34e89507 | 425 | sta = sta_info_alloc(sdata, addr, gfp); |
46900298 JB |
426 | if (!sta) |
427 | return NULL; | |
428 | ||
429 | set_sta_flags(sta, WLAN_STA_AUTHORIZED); | |
430 | ||
431 | /* make sure mandatory rates are always added */ | |
432 | sta->sta.supp_rates[band] = supp_rates | | |
433 | ieee80211_mandatory_rates(local, band); | |
434 | ||
435 | rate_control_rate_init(sta); | |
436 | ||
34e89507 | 437 | /* If it fails, maybe we raced another insertion? */ |
46900298 | 438 | if (sta_info_insert(sta)) |
34e89507 | 439 | return sta_info_get(sdata, addr); |
46900298 JB |
440 | return sta; |
441 | } | |
442 | ||
443 | static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) | |
444 | { | |
445 | struct ieee80211_local *local = sdata->local; | |
446 | int active = 0; | |
447 | struct sta_info *sta; | |
448 | ||
449 | rcu_read_lock(); | |
450 | ||
451 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
452 | if (sta->sdata == sdata && | |
453 | time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL, | |
454 | jiffies)) { | |
455 | active++; | |
456 | break; | |
457 | } | |
458 | } | |
459 | ||
460 | rcu_read_unlock(); | |
461 | ||
462 | return active; | |
463 | } | |
464 | ||
ce9058ae BP |
465 | /* |
466 | * This function is called with state == IEEE80211_IBSS_MLME_JOINED | |
467 | */ | |
46900298 JB |
468 | |
469 | static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) | |
470 | { | |
471 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
472 | ||
af8cdcd8 JB |
473 | mod_timer(&ifibss->timer, |
474 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 JB |
475 | |
476 | ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT); | |
af8cdcd8 | 477 | |
450aae3d S |
478 | if (time_before(jiffies, ifibss->last_scan_completed + |
479 | IEEE80211_IBSS_MERGE_INTERVAL)) | |
480 | return; | |
481 | ||
46900298 JB |
482 | if (ieee80211_sta_active_ibss(sdata)) |
483 | return; | |
484 | ||
af8cdcd8 | 485 | if (ifibss->fixed_channel) |
46900298 JB |
486 | return; |
487 | ||
488 | printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other " | |
47846c9b | 489 | "IBSS networks with same SSID (merge)\n", sdata->name); |
46900298 | 490 | |
be4a4b6a JB |
491 | ieee80211_request_internal_scan(sdata, |
492 | ifibss->ssid, ifibss->ssid_len, | |
493 | ifibss->fixed_channel ? ifibss->channel : NULL); | |
46900298 JB |
494 | } |
495 | ||
af8cdcd8 | 496 | static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
497 | { |
498 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
499 | struct ieee80211_local *local = sdata->local; | |
500 | struct ieee80211_supported_band *sband; | |
46900298 | 501 | u8 bssid[ETH_ALEN]; |
46900298 JB |
502 | u16 capability; |
503 | int i; | |
504 | ||
af8cdcd8 | 505 | if (ifibss->fixed_bssid) { |
46900298 JB |
506 | memcpy(bssid, ifibss->bssid, ETH_ALEN); |
507 | } else { | |
508 | /* Generate random, not broadcast, locally administered BSSID. Mix in | |
509 | * own MAC address to make sure that devices that do not have proper | |
510 | * random number generator get different BSSID. */ | |
511 | get_random_bytes(bssid, ETH_ALEN); | |
512 | for (i = 0; i < ETH_ALEN; i++) | |
47846c9b | 513 | bssid[i] ^= sdata->vif.addr[i]; |
46900298 JB |
514 | bssid[0] &= ~0x01; |
515 | bssid[0] |= 0x02; | |
516 | } | |
517 | ||
518 | printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n", | |
47846c9b | 519 | sdata->name, bssid); |
46900298 | 520 | |
af8cdcd8 | 521 | sband = local->hw.wiphy->bands[ifibss->channel->band]; |
46900298 | 522 | |
46900298 JB |
523 | capability = WLAN_CAPABILITY_IBSS; |
524 | ||
fffd0934 | 525 | if (ifibss->privacy) |
46900298 JB |
526 | capability |= WLAN_CAPABILITY_PRIVACY; |
527 | else | |
528 | sdata->drop_unencrypted = 0; | |
529 | ||
57c4d7b4 | 530 | __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, |
b59066a2 JB |
531 | ifibss->channel, 3, /* first two are basic */ |
532 | capability, 0); | |
46900298 JB |
533 | } |
534 | ||
ce9058ae BP |
535 | /* |
536 | * This function is called with state == IEEE80211_IBSS_MLME_SEARCH | |
537 | */ | |
538 | ||
af8cdcd8 | 539 | static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
540 | { |
541 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
542 | struct ieee80211_local *local = sdata->local; | |
0c1ad2ca | 543 | struct cfg80211_bss *cbss; |
af8cdcd8 | 544 | struct ieee80211_channel *chan = NULL; |
46900298 JB |
545 | const u8 *bssid = NULL; |
546 | int active_ibss; | |
e0d61887 | 547 | u16 capability; |
46900298 | 548 | |
46900298 JB |
549 | active_ibss = ieee80211_sta_active_ibss(sdata); |
550 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
551 | printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n", | |
47846c9b | 552 | sdata->name, active_ibss); |
46900298 JB |
553 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
554 | ||
555 | if (active_ibss) | |
af8cdcd8 | 556 | return; |
46900298 | 557 | |
e0d61887 | 558 | capability = WLAN_CAPABILITY_IBSS; |
fffd0934 | 559 | if (ifibss->privacy) |
e0d61887 | 560 | capability |= WLAN_CAPABILITY_PRIVACY; |
af8cdcd8 JB |
561 | if (ifibss->fixed_bssid) |
562 | bssid = ifibss->bssid; | |
563 | if (ifibss->fixed_channel) | |
564 | chan = ifibss->channel; | |
565 | if (!is_zero_ether_addr(ifibss->bssid)) | |
46900298 | 566 | bssid = ifibss->bssid; |
0c1ad2ca JB |
567 | cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, |
568 | ifibss->ssid, ifibss->ssid_len, | |
569 | WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY, | |
570 | capability); | |
571 | ||
572 | if (cbss) { | |
573 | struct ieee80211_bss *bss; | |
46900298 | 574 | |
0c1ad2ca | 575 | bss = (void *)cbss->priv; |
46900298 | 576 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
46900298 | 577 | printk(KERN_DEBUG " sta_find_ibss: selected %pM current " |
0c1ad2ca | 578 | "%pM\n", cbss->bssid, ifibss->bssid); |
46900298 JB |
579 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
580 | ||
46900298 JB |
581 | printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM" |
582 | " based on configured SSID\n", | |
0c1ad2ca | 583 | sdata->name, cbss->bssid); |
46900298 | 584 | |
af8cdcd8 | 585 | ieee80211_sta_join_ibss(sdata, bss); |
46900298 | 586 | ieee80211_rx_bss_put(local, bss); |
af8cdcd8 | 587 | return; |
d419b9f0 | 588 | } |
46900298 JB |
589 | |
590 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
591 | printk(KERN_DEBUG " did not try to join ibss\n"); | |
592 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ | |
593 | ||
594 | /* Selected IBSS not found in current scan results - try to scan */ | |
ce9058ae | 595 | if (time_after(jiffies, ifibss->last_scan_completed + |
46900298 JB |
596 | IEEE80211_SCAN_INTERVAL)) { |
597 | printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to " | |
47846c9b | 598 | "join\n", sdata->name); |
46900298 | 599 | |
be4a4b6a JB |
600 | ieee80211_request_internal_scan(sdata, |
601 | ifibss->ssid, ifibss->ssid_len, | |
602 | ifibss->fixed_channel ? ifibss->channel : NULL); | |
ce9058ae | 603 | } else { |
46900298 JB |
604 | int interval = IEEE80211_SCAN_INTERVAL; |
605 | ||
606 | if (time_after(jiffies, ifibss->ibss_join_req + | |
607 | IEEE80211_IBSS_JOIN_TIMEOUT)) { | |
af8cdcd8 JB |
608 | if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) { |
609 | ieee80211_sta_create_ibss(sdata); | |
610 | return; | |
611 | } | |
46900298 | 612 | printk(KERN_DEBUG "%s: IBSS not allowed on" |
47846c9b | 613 | " %d MHz\n", sdata->name, |
46900298 JB |
614 | local->hw.conf.channel->center_freq); |
615 | ||
616 | /* No IBSS found - decrease scan interval and continue | |
617 | * scanning. */ | |
618 | interval = IEEE80211_SCAN_INTERVAL_SLOW; | |
619 | } | |
620 | ||
af8cdcd8 JB |
621 | mod_timer(&ifibss->timer, |
622 | round_jiffies(jiffies + interval)); | |
46900298 | 623 | } |
46900298 JB |
624 | } |
625 | ||
626 | static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, | |
627 | struct ieee80211_mgmt *mgmt, | |
628 | size_t len) | |
629 | { | |
630 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
631 | struct ieee80211_local *local = sdata->local; | |
632 | int tx_last_beacon; | |
633 | struct sk_buff *skb; | |
634 | struct ieee80211_mgmt *resp; | |
635 | u8 *pos, *end; | |
636 | ||
637 | if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || | |
af8cdcd8 | 638 | len < 24 + 2 || !ifibss->presp) |
46900298 JB |
639 | return; |
640 | ||
24487981 | 641 | tx_last_beacon = drv_tx_last_beacon(local); |
46900298 JB |
642 | |
643 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
644 | printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM" | |
645 | " (tx_last_beacon=%d)\n", | |
47846c9b | 646 | sdata->name, mgmt->sa, mgmt->da, |
46900298 JB |
647 | mgmt->bssid, tx_last_beacon); |
648 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ | |
649 | ||
650 | if (!tx_last_beacon) | |
651 | return; | |
652 | ||
653 | if (memcmp(mgmt->bssid, ifibss->bssid, ETH_ALEN) != 0 && | |
654 | memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0) | |
655 | return; | |
656 | ||
657 | end = ((u8 *) mgmt) + len; | |
658 | pos = mgmt->u.probe_req.variable; | |
659 | if (pos[0] != WLAN_EID_SSID || | |
660 | pos + 2 + pos[1] > end) { | |
661 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
662 | printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq " | |
663 | "from %pM\n", | |
47846c9b | 664 | sdata->name, mgmt->sa); |
46900298 JB |
665 | #endif |
666 | return; | |
667 | } | |
668 | if (pos[1] != 0 && | |
669 | (pos[1] != ifibss->ssid_len || | |
0da780c2 | 670 | memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { |
46900298 JB |
671 | /* Ignore ProbeReq for foreign SSID */ |
672 | return; | |
673 | } | |
674 | ||
675 | /* Reply with ProbeResp */ | |
af8cdcd8 | 676 | skb = skb_copy(ifibss->presp, GFP_KERNEL); |
46900298 JB |
677 | if (!skb) |
678 | return; | |
679 | ||
680 | resp = (struct ieee80211_mgmt *) skb->data; | |
681 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
682 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
683 | printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n", | |
47846c9b | 684 | sdata->name, resp->da); |
46900298 | 685 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
62ae67be JB |
686 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
687 | ieee80211_tx_skb(sdata, skb); | |
46900298 JB |
688 | } |
689 | ||
690 | static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, | |
691 | struct ieee80211_mgmt *mgmt, | |
692 | size_t len, | |
693 | struct ieee80211_rx_status *rx_status) | |
694 | { | |
695 | size_t baselen; | |
696 | struct ieee802_11_elems elems; | |
697 | ||
47846c9b | 698 | if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN)) |
46900298 JB |
699 | return; /* ignore ProbeResp to foreign address */ |
700 | ||
701 | baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; | |
702 | if (baselen > len) | |
703 | return; | |
704 | ||
705 | ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, | |
706 | &elems); | |
707 | ||
708 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); | |
709 | } | |
710 | ||
711 | static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, | |
712 | struct ieee80211_mgmt *mgmt, | |
713 | size_t len, | |
714 | struct ieee80211_rx_status *rx_status) | |
715 | { | |
716 | size_t baselen; | |
717 | struct ieee802_11_elems elems; | |
718 | ||
719 | /* Process beacon from the current BSS */ | |
720 | baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; | |
721 | if (baselen > len) | |
722 | return; | |
723 | ||
724 | ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems); | |
725 | ||
726 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true); | |
727 | } | |
728 | ||
729 | static void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, | |
730 | struct sk_buff *skb) | |
731 | { | |
732 | struct ieee80211_rx_status *rx_status; | |
733 | struct ieee80211_mgmt *mgmt; | |
734 | u16 fc; | |
735 | ||
f1d58c25 | 736 | rx_status = IEEE80211_SKB_RXCB(skb); |
46900298 JB |
737 | mgmt = (struct ieee80211_mgmt *) skb->data; |
738 | fc = le16_to_cpu(mgmt->frame_control); | |
739 | ||
740 | switch (fc & IEEE80211_FCTL_STYPE) { | |
741 | case IEEE80211_STYPE_PROBE_REQ: | |
742 | ieee80211_rx_mgmt_probe_req(sdata, mgmt, skb->len); | |
743 | break; | |
744 | case IEEE80211_STYPE_PROBE_RESP: | |
745 | ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, | |
746 | rx_status); | |
747 | break; | |
748 | case IEEE80211_STYPE_BEACON: | |
749 | ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, | |
750 | rx_status); | |
751 | break; | |
752 | case IEEE80211_STYPE_AUTH: | |
753 | ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); | |
754 | break; | |
755 | } | |
756 | ||
757 | kfree_skb(skb); | |
758 | } | |
759 | ||
760 | static void ieee80211_ibss_work(struct work_struct *work) | |
761 | { | |
762 | struct ieee80211_sub_if_data *sdata = | |
763 | container_of(work, struct ieee80211_sub_if_data, u.ibss.work); | |
764 | struct ieee80211_local *local = sdata->local; | |
765 | struct ieee80211_if_ibss *ifibss; | |
766 | struct sk_buff *skb; | |
767 | ||
5bb644a0 JB |
768 | if (WARN_ON(local->suspended)) |
769 | return; | |
770 | ||
9607e6b6 | 771 | if (!ieee80211_sdata_running(sdata)) |
46900298 JB |
772 | return; |
773 | ||
fbe9c429 | 774 | if (local->scanning) |
46900298 JB |
775 | return; |
776 | ||
777 | if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_ADHOC)) | |
778 | return; | |
779 | ifibss = &sdata->u.ibss; | |
780 | ||
781 | while ((skb = skb_dequeue(&ifibss->skb_queue))) | |
782 | ieee80211_ibss_rx_queued_mgmt(sdata, skb); | |
783 | ||
784 | if (!test_and_clear_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request)) | |
785 | return; | |
786 | ||
787 | switch (ifibss->state) { | |
788 | case IEEE80211_IBSS_MLME_SEARCH: | |
789 | ieee80211_sta_find_ibss(sdata); | |
790 | break; | |
791 | case IEEE80211_IBSS_MLME_JOINED: | |
792 | ieee80211_sta_merge_ibss(sdata); | |
793 | break; | |
794 | default: | |
795 | WARN_ON(1); | |
796 | break; | |
797 | } | |
798 | } | |
799 | ||
800 | static void ieee80211_ibss_timer(unsigned long data) | |
801 | { | |
802 | struct ieee80211_sub_if_data *sdata = | |
803 | (struct ieee80211_sub_if_data *) data; | |
804 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
805 | struct ieee80211_local *local = sdata->local; | |
806 | ||
5bb644a0 JB |
807 | if (local->quiescing) { |
808 | ifibss->timer_running = true; | |
809 | return; | |
810 | } | |
811 | ||
46900298 | 812 | set_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request); |
42935eca | 813 | ieee80211_queue_work(&local->hw, &ifibss->work); |
46900298 JB |
814 | } |
815 | ||
5bb644a0 JB |
816 | #ifdef CONFIG_PM |
817 | void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata) | |
818 | { | |
819 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
820 | ||
821 | cancel_work_sync(&ifibss->work); | |
822 | if (del_timer_sync(&ifibss->timer)) | |
823 | ifibss->timer_running = true; | |
824 | } | |
825 | ||
826 | void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata) | |
827 | { | |
828 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
829 | ||
830 | if (ifibss->timer_running) { | |
831 | add_timer(&ifibss->timer); | |
832 | ifibss->timer_running = false; | |
833 | } | |
834 | } | |
835 | #endif | |
836 | ||
46900298 JB |
837 | void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) |
838 | { | |
839 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
840 | ||
841 | INIT_WORK(&ifibss->work, ieee80211_ibss_work); | |
842 | setup_timer(&ifibss->timer, ieee80211_ibss_timer, | |
843 | (unsigned long) sdata); | |
844 | skb_queue_head_init(&ifibss->skb_queue); | |
46900298 JB |
845 | } |
846 | ||
847 | /* scan finished notification */ | |
848 | void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) | |
849 | { | |
af8cdcd8 | 850 | struct ieee80211_sub_if_data *sdata; |
46900298 | 851 | |
29b4a4f7 JB |
852 | mutex_lock(&local->iflist_mtx); |
853 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 854 | if (!ieee80211_sdata_running(sdata)) |
0e41f715 | 855 | continue; |
af8cdcd8 JB |
856 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
857 | continue; | |
0e41f715 JB |
858 | if (!sdata->u.ibss.ssid_len) |
859 | continue; | |
af8cdcd8 | 860 | sdata->u.ibss.last_scan_completed = jiffies; |
51f98f13 | 861 | mod_timer(&sdata->u.ibss.timer, 0); |
46900298 | 862 | } |
29b4a4f7 | 863 | mutex_unlock(&local->iflist_mtx); |
46900298 JB |
864 | } |
865 | ||
866 | ieee80211_rx_result | |
f1d58c25 | 867 | ieee80211_ibss_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) |
46900298 JB |
868 | { |
869 | struct ieee80211_local *local = sdata->local; | |
870 | struct ieee80211_mgmt *mgmt; | |
871 | u16 fc; | |
872 | ||
873 | if (skb->len < 24) | |
874 | return RX_DROP_MONITOR; | |
875 | ||
876 | mgmt = (struct ieee80211_mgmt *) skb->data; | |
877 | fc = le16_to_cpu(mgmt->frame_control); | |
878 | ||
879 | switch (fc & IEEE80211_FCTL_STYPE) { | |
880 | case IEEE80211_STYPE_PROBE_RESP: | |
881 | case IEEE80211_STYPE_BEACON: | |
46900298 JB |
882 | case IEEE80211_STYPE_PROBE_REQ: |
883 | case IEEE80211_STYPE_AUTH: | |
884 | skb_queue_tail(&sdata->u.ibss.skb_queue, skb); | |
42935eca | 885 | ieee80211_queue_work(&local->hw, &sdata->u.ibss.work); |
46900298 JB |
886 | return RX_QUEUED; |
887 | } | |
888 | ||
889 | return RX_DROP_MONITOR; | |
890 | } | |
af8cdcd8 JB |
891 | |
892 | int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, | |
893 | struct cfg80211_ibss_params *params) | |
894 | { | |
895 | struct sk_buff *skb; | |
896 | ||
af8cdcd8 JB |
897 | if (params->bssid) { |
898 | memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); | |
899 | sdata->u.ibss.fixed_bssid = true; | |
900 | } else | |
901 | sdata->u.ibss.fixed_bssid = false; | |
902 | ||
fffd0934 JB |
903 | sdata->u.ibss.privacy = params->privacy; |
904 | ||
57c4d7b4 JB |
905 | sdata->vif.bss_conf.beacon_int = params->beacon_interval; |
906 | ||
af8cdcd8 JB |
907 | sdata->u.ibss.channel = params->channel; |
908 | sdata->u.ibss.fixed_channel = params->channel_fixed; | |
909 | ||
910 | if (params->ie) { | |
911 | sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, | |
912 | GFP_KERNEL); | |
913 | if (sdata->u.ibss.ie) | |
914 | sdata->u.ibss.ie_len = params->ie_len; | |
915 | } | |
916 | ||
917 | skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + | |
918 | 36 /* bitrates */ + | |
919 | 34 /* SSID */ + | |
920 | 3 /* DS params */ + | |
921 | 4 /* IBSS params */ + | |
922 | params->ie_len); | |
923 | if (!skb) | |
924 | return -ENOMEM; | |
925 | ||
926 | sdata->u.ibss.skb = skb; | |
927 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; | |
928 | sdata->u.ibss.ibss_join_req = jiffies; | |
929 | ||
0e41f715 JB |
930 | memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN); |
931 | ||
932 | /* | |
933 | * The ssid_len setting below is used to see whether | |
934 | * we are active, and we need all other settings | |
935 | * before that may get visible. | |
936 | */ | |
937 | mb(); | |
938 | ||
939 | sdata->u.ibss.ssid_len = params->ssid_len; | |
940 | ||
5cff20e6 JB |
941 | ieee80211_recalc_idle(sdata->local); |
942 | ||
af8cdcd8 | 943 | set_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request); |
42935eca | 944 | ieee80211_queue_work(&sdata->local->hw, &sdata->u.ibss.work); |
af8cdcd8 JB |
945 | |
946 | return 0; | |
947 | } | |
948 | ||
949 | int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) | |
950 | { | |
951 | struct sk_buff *skb; | |
952 | ||
953 | del_timer_sync(&sdata->u.ibss.timer); | |
954 | clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request); | |
955 | cancel_work_sync(&sdata->u.ibss.work); | |
956 | clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request); | |
957 | ||
958 | sta_info_flush(sdata->local, sdata); | |
959 | ||
960 | /* remove beacon */ | |
961 | kfree(sdata->u.ibss.ie); | |
962 | skb = sdata->u.ibss.presp; | |
963 | rcu_assign_pointer(sdata->u.ibss.presp, NULL); | |
8fc214ba JB |
964 | sdata->vif.bss_conf.ibss_joined = false; |
965 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | | |
966 | BSS_CHANGED_IBSS); | |
af8cdcd8 JB |
967 | synchronize_rcu(); |
968 | kfree_skb(skb); | |
969 | ||
970 | skb_queue_purge(&sdata->u.ibss.skb_queue); | |
971 | memset(sdata->u.ibss.bssid, 0, ETH_ALEN); | |
5cff20e6 JB |
972 | sdata->u.ibss.ssid_len = 0; |
973 | ||
974 | ieee80211_recalc_idle(sdata->local); | |
af8cdcd8 JB |
975 | |
976 | return 0; | |
977 | } |