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Commit | Line | Data |
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46900298 JB |
1 | /* |
2 | * IBSS mode implementation | |
3 | * Copyright 2003-2008, Jouni Malinen <j@w1.fi> | |
4 | * Copyright 2004, Instant802 Networks, Inc. | |
5 | * Copyright 2005, Devicescape Software, Inc. | |
6 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
7 | * Copyright 2007, Michael Wu <flamingice@sourmilk.net> | |
8 | * Copyright 2009, Johannes Berg <johannes@sipsolutions.net> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
13 | */ | |
14 | ||
15 | #include <linux/delay.h> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
46900298 JB |
17 | #include <linux/if_ether.h> |
18 | #include <linux/skbuff.h> | |
19 | #include <linux/if_arp.h> | |
20 | #include <linux/etherdevice.h> | |
21 | #include <linux/rtnetlink.h> | |
22 | #include <net/mac80211.h> | |
23 | #include <asm/unaligned.h> | |
24 | ||
25 | #include "ieee80211_i.h" | |
24487981 | 26 | #include "driver-ops.h" |
46900298 JB |
27 | #include "rate.h" |
28 | ||
29 | #define IEEE80211_SCAN_INTERVAL (2 * HZ) | |
30 | #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ) | |
31 | #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ) | |
32 | ||
33 | #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ) | |
4a332a38 | 34 | #define IEEE80211_IBSS_MERGE_DELAY 0x400000 |
46900298 JB |
35 | #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ) |
36 | ||
37 | #define IEEE80211_IBSS_MAX_STA_ENTRIES 128 | |
38 | ||
39 | ||
40 | static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, | |
41 | struct ieee80211_mgmt *mgmt, | |
42 | size_t len) | |
43 | { | |
44 | u16 auth_alg, auth_transaction, status_code; | |
45 | ||
46 | if (len < 24 + 6) | |
47 | return; | |
48 | ||
49 | auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); | |
50 | auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); | |
51 | status_code = le16_to_cpu(mgmt->u.auth.status_code); | |
52 | ||
53 | /* | |
54 | * IEEE 802.11 standard does not require authentication in IBSS | |
55 | * networks and most implementations do not seem to use it. | |
56 | * However, try to reply to authentication attempts if someone | |
57 | * has actually implemented this. | |
58 | */ | |
59 | if (auth_alg == WLAN_AUTH_OPEN && auth_transaction == 1) | |
60 | ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, NULL, 0, | |
fffd0934 | 61 | sdata->u.ibss.bssid, NULL, 0, 0); |
46900298 JB |
62 | } |
63 | ||
af8cdcd8 JB |
64 | static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
65 | const u8 *bssid, const int beacon_int, | |
66 | struct ieee80211_channel *chan, | |
b59066a2 | 67 | const u32 basic_rates, |
af8cdcd8 | 68 | const u16 capability, u64 tsf) |
46900298 JB |
69 | { |
70 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
71 | struct ieee80211_local *local = sdata->local; | |
b59066a2 | 72 | int rates, i; |
46900298 JB |
73 | struct sk_buff *skb; |
74 | struct ieee80211_mgmt *mgmt; | |
75 | u8 *pos; | |
76 | struct ieee80211_supported_band *sband; | |
f446d10f | 77 | struct cfg80211_bss *bss; |
57c4d7b4 | 78 | u32 bss_change; |
b59066a2 | 79 | u8 supp_rates[IEEE80211_MAX_SUPP_RATES]; |
24487981 JB |
80 | |
81 | /* Reset own TSF to allow time synchronization work. */ | |
82 | drv_reset_tsf(local); | |
46900298 | 83 | |
af8cdcd8 JB |
84 | skb = ifibss->skb; |
85 | rcu_assign_pointer(ifibss->presp, NULL); | |
86 | synchronize_rcu(); | |
87 | skb->data = skb->head; | |
88 | skb->len = 0; | |
89 | skb_reset_tail_pointer(skb); | |
90 | skb_reserve(skb, sdata->local->hw.extra_tx_headroom); | |
46900298 | 91 | |
af8cdcd8 JB |
92 | if (memcmp(ifibss->bssid, bssid, ETH_ALEN)) |
93 | sta_info_flush(sdata->local, sdata); | |
46900298 | 94 | |
49b5c7f4 JB |
95 | /* if merging, indicate to driver that we leave the old IBSS */ |
96 | if (sdata->vif.bss_conf.ibss_joined) { | |
97 | sdata->vif.bss_conf.ibss_joined = false; | |
98 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IBSS); | |
99 | } | |
100 | ||
46900298 | 101 | memcpy(ifibss->bssid, bssid, ETH_ALEN); |
46900298 | 102 | |
af8cdcd8 | 103 | sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0; |
46900298 | 104 | |
af8cdcd8 | 105 | local->oper_channel = chan; |
0aaffa9b | 106 | WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT)); |
af8cdcd8 | 107 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); |
57c4d7b4 | 108 | |
af8cdcd8 | 109 | sband = local->hw.wiphy->bands[chan->band]; |
46900298 | 110 | |
b59066a2 JB |
111 | /* build supported rates array */ |
112 | pos = supp_rates; | |
113 | for (i = 0; i < sband->n_bitrates; i++) { | |
114 | int rate = sband->bitrates[i].bitrate; | |
115 | u8 basic = 0; | |
116 | if (basic_rates & BIT(i)) | |
117 | basic = 0x80; | |
118 | *pos++ = basic | (u8) (rate / 5); | |
119 | } | |
120 | ||
46900298 | 121 | /* Build IBSS probe response */ |
af8cdcd8 | 122 | mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon)); |
46900298 JB |
123 | memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon)); |
124 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | | |
125 | IEEE80211_STYPE_PROBE_RESP); | |
126 | memset(mgmt->da, 0xff, ETH_ALEN); | |
47846c9b | 127 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
46900298 | 128 | memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN); |
57c4d7b4 | 129 | mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int); |
707c1b4e | 130 | mgmt->u.beacon.timestamp = cpu_to_le64(tsf); |
46900298 JB |
131 | mgmt->u.beacon.capab_info = cpu_to_le16(capability); |
132 | ||
133 | pos = skb_put(skb, 2 + ifibss->ssid_len); | |
134 | *pos++ = WLAN_EID_SSID; | |
135 | *pos++ = ifibss->ssid_len; | |
136 | memcpy(pos, ifibss->ssid, ifibss->ssid_len); | |
137 | ||
b59066a2 | 138 | rates = sband->n_bitrates; |
46900298 JB |
139 | if (rates > 8) |
140 | rates = 8; | |
141 | pos = skb_put(skb, 2 + rates); | |
142 | *pos++ = WLAN_EID_SUPP_RATES; | |
143 | *pos++ = rates; | |
144 | memcpy(pos, supp_rates, rates); | |
145 | ||
146 | if (sband->band == IEEE80211_BAND_2GHZ) { | |
147 | pos = skb_put(skb, 2 + 1); | |
148 | *pos++ = WLAN_EID_DS_PARAMS; | |
149 | *pos++ = 1; | |
af8cdcd8 | 150 | *pos++ = ieee80211_frequency_to_channel(chan->center_freq); |
46900298 JB |
151 | } |
152 | ||
153 | pos = skb_put(skb, 2 + 2); | |
154 | *pos++ = WLAN_EID_IBSS_PARAMS; | |
155 | *pos++ = 2; | |
156 | /* FIX: set ATIM window based on scan results */ | |
157 | *pos++ = 0; | |
158 | *pos++ = 0; | |
159 | ||
b59066a2 JB |
160 | if (sband->n_bitrates > 8) { |
161 | rates = sband->n_bitrates - 8; | |
46900298 JB |
162 | pos = skb_put(skb, 2 + rates); |
163 | *pos++ = WLAN_EID_EXT_SUPP_RATES; | |
164 | *pos++ = rates; | |
165 | memcpy(pos, &supp_rates[8], rates); | |
166 | } | |
167 | ||
af8cdcd8 JB |
168 | if (ifibss->ie_len) |
169 | memcpy(skb_put(skb, ifibss->ie_len), | |
170 | ifibss->ie, ifibss->ie_len); | |
171 | ||
172 | rcu_assign_pointer(ifibss->presp, skb); | |
46900298 | 173 | |
2d0ddec5 JB |
174 | sdata->vif.bss_conf.beacon_int = beacon_int; |
175 | bss_change = BSS_CHANGED_BEACON_INT; | |
176 | bss_change |= ieee80211_reset_erp_info(sdata); | |
177 | bss_change |= BSS_CHANGED_BSSID; | |
178 | bss_change |= BSS_CHANGED_BEACON; | |
179 | bss_change |= BSS_CHANGED_BEACON_ENABLED; | |
8fc214ba JB |
180 | bss_change |= BSS_CHANGED_IBSS; |
181 | sdata->vif.bss_conf.ibss_joined = true; | |
2d0ddec5 | 182 | ieee80211_bss_info_change_notify(sdata, bss_change); |
46900298 | 183 | |
b59066a2 | 184 | ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates); |
46900298 | 185 | |
46900298 | 186 | ifibss->state = IEEE80211_IBSS_MLME_JOINED; |
af8cdcd8 JB |
187 | mod_timer(&ifibss->timer, |
188 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 | 189 | |
f446d10f JB |
190 | bss = cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel, |
191 | mgmt, skb->len, 0, GFP_KERNEL); | |
192 | cfg80211_put_bss(bss); | |
af8cdcd8 | 193 | cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL); |
46900298 JB |
194 | } |
195 | ||
af8cdcd8 JB |
196 | static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
197 | struct ieee80211_bss *bss) | |
46900298 | 198 | { |
0c1ad2ca JB |
199 | struct cfg80211_bss *cbss = |
200 | container_of((void *)bss, struct cfg80211_bss, priv); | |
b59066a2 JB |
201 | struct ieee80211_supported_band *sband; |
202 | u32 basic_rates; | |
203 | int i, j; | |
0c1ad2ca | 204 | u16 beacon_int = cbss->beacon_interval; |
57c4d7b4 JB |
205 | |
206 | if (beacon_int < 10) | |
207 | beacon_int = 10; | |
208 | ||
0c1ad2ca | 209 | sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; |
b59066a2 JB |
210 | |
211 | basic_rates = 0; | |
212 | ||
213 | for (i = 0; i < bss->supp_rates_len; i++) { | |
214 | int rate = (bss->supp_rates[i] & 0x7f) * 5; | |
215 | bool is_basic = !!(bss->supp_rates[i] & 0x80); | |
216 | ||
217 | for (j = 0; j < sband->n_bitrates; j++) { | |
218 | if (sband->bitrates[j].bitrate == rate) { | |
219 | if (is_basic) | |
220 | basic_rates |= BIT(j); | |
221 | break; | |
222 | } | |
223 | } | |
224 | } | |
225 | ||
0c1ad2ca | 226 | __ieee80211_sta_join_ibss(sdata, cbss->bssid, |
57c4d7b4 | 227 | beacon_int, |
0c1ad2ca | 228 | cbss->channel, |
b59066a2 | 229 | basic_rates, |
0c1ad2ca JB |
230 | cbss->capability, |
231 | cbss->tsf); | |
46900298 JB |
232 | } |
233 | ||
234 | static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, | |
235 | struct ieee80211_mgmt *mgmt, | |
236 | size_t len, | |
237 | struct ieee80211_rx_status *rx_status, | |
238 | struct ieee802_11_elems *elems, | |
239 | bool beacon) | |
240 | { | |
241 | struct ieee80211_local *local = sdata->local; | |
242 | int freq; | |
0c1ad2ca | 243 | struct cfg80211_bss *cbss; |
46900298 JB |
244 | struct ieee80211_bss *bss; |
245 | struct sta_info *sta; | |
246 | struct ieee80211_channel *channel; | |
247 | u64 beacon_timestamp, rx_timestamp; | |
248 | u32 supp_rates = 0; | |
249 | enum ieee80211_band band = rx_status->band; | |
250 | ||
251 | if (elems->ds_params && elems->ds_params_len == 1) | |
252 | freq = ieee80211_channel_to_frequency(elems->ds_params[0]); | |
253 | else | |
254 | freq = rx_status->freq; | |
255 | ||
256 | channel = ieee80211_get_channel(local->hw.wiphy, freq); | |
257 | ||
258 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
259 | return; | |
260 | ||
261 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates && | |
262 | memcmp(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) { | |
263 | supp_rates = ieee80211_sta_get_rates(local, elems, band); | |
264 | ||
265 | rcu_read_lock(); | |
266 | ||
abe60632 | 267 | sta = sta_info_get(sdata, mgmt->sa); |
46900298 JB |
268 | if (sta) { |
269 | u32 prev_rates; | |
270 | ||
271 | prev_rates = sta->sta.supp_rates[band]; | |
272 | /* make sure mandatory rates are always added */ | |
273 | sta->sta.supp_rates[band] = supp_rates | | |
274 | ieee80211_mandatory_rates(local, band); | |
275 | ||
09a08cff | 276 | if (sta->sta.supp_rates[band] != prev_rates) { |
46900298 | 277 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
46900298 | 278 | printk(KERN_DEBUG "%s: updated supp_rates set " |
09a08cff BR |
279 | "for %pM based on beacon/probe_response " |
280 | "(0x%x -> 0x%x)\n", | |
281 | sdata->name, sta->sta.addr, | |
282 | prev_rates, sta->sta.supp_rates[band]); | |
46900298 | 283 | #endif |
09a08cff BR |
284 | rate_control_rate_init(sta); |
285 | } | |
34e89507 JB |
286 | rcu_read_unlock(); |
287 | } else { | |
288 | rcu_read_unlock(); | |
289 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, | |
290 | supp_rates, GFP_KERNEL); | |
291 | } | |
46900298 JB |
292 | } |
293 | ||
294 | bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, | |
295 | channel, beacon); | |
296 | if (!bss) | |
297 | return; | |
298 | ||
0c1ad2ca JB |
299 | cbss = container_of((void *)bss, struct cfg80211_bss, priv); |
300 | ||
46900298 | 301 | /* was just updated in ieee80211_bss_info_update */ |
0c1ad2ca | 302 | beacon_timestamp = cbss->tsf; |
46900298 JB |
303 | |
304 | /* check if we need to merge IBSS */ | |
305 | ||
46900298 | 306 | /* we use a fixed BSSID */ |
a98bfec2 | 307 | if (sdata->u.ibss.fixed_bssid) |
46900298 JB |
308 | goto put_bss; |
309 | ||
310 | /* not an IBSS */ | |
0c1ad2ca | 311 | if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) |
46900298 JB |
312 | goto put_bss; |
313 | ||
314 | /* different channel */ | |
0c1ad2ca | 315 | if (cbss->channel != local->oper_channel) |
46900298 JB |
316 | goto put_bss; |
317 | ||
318 | /* different SSID */ | |
319 | if (elems->ssid_len != sdata->u.ibss.ssid_len || | |
320 | memcmp(elems->ssid, sdata->u.ibss.ssid, | |
321 | sdata->u.ibss.ssid_len)) | |
322 | goto put_bss; | |
323 | ||
34e8f082 | 324 | /* same BSSID */ |
0c1ad2ca | 325 | if (memcmp(cbss->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) |
34e8f082 AF |
326 | goto put_bss; |
327 | ||
46900298 JB |
328 | if (rx_status->flag & RX_FLAG_TSFT) { |
329 | /* | |
330 | * For correct IBSS merging we need mactime; since mactime is | |
331 | * defined as the time the first data symbol of the frame hits | |
332 | * the PHY, and the timestamp of the beacon is defined as "the | |
333 | * time that the data symbol containing the first bit of the | |
334 | * timestamp is transmitted to the PHY plus the transmitting | |
335 | * STA's delays through its local PHY from the MAC-PHY | |
336 | * interface to its interface with the WM" (802.11 11.1.2) | |
337 | * - equals the time this bit arrives at the receiver - we have | |
338 | * to take into account the offset between the two. | |
339 | * | |
340 | * E.g. at 1 MBit that means mactime is 192 usec earlier | |
341 | * (=24 bytes * 8 usecs/byte) than the beacon timestamp. | |
342 | */ | |
343 | int rate; | |
344 | ||
345 | if (rx_status->flag & RX_FLAG_HT) | |
346 | rate = 65; /* TODO: HT rates */ | |
347 | else | |
348 | rate = local->hw.wiphy->bands[band]-> | |
349 | bitrates[rx_status->rate_idx].bitrate; | |
350 | ||
351 | rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate); | |
24487981 JB |
352 | } else { |
353 | /* | |
354 | * second best option: get current TSF | |
355 | * (will return -1 if not supported) | |
356 | */ | |
357 | rx_timestamp = drv_get_tsf(local); | |
358 | } | |
46900298 JB |
359 | |
360 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
361 | printk(KERN_DEBUG "RX beacon SA=%pM BSSID=" | |
362 | "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", | |
363 | mgmt->sa, mgmt->bssid, | |
364 | (unsigned long long)rx_timestamp, | |
365 | (unsigned long long)beacon_timestamp, | |
366 | (unsigned long long)(rx_timestamp - beacon_timestamp), | |
367 | jiffies); | |
368 | #endif | |
369 | ||
4a332a38 AF |
370 | /* give slow hardware some time to do the TSF sync */ |
371 | if (rx_timestamp < IEEE80211_IBSS_MERGE_DELAY) | |
372 | goto put_bss; | |
373 | ||
46900298 JB |
374 | if (beacon_timestamp > rx_timestamp) { |
375 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
376 | printk(KERN_DEBUG "%s: beacon TSF higher than " | |
377 | "local TSF - IBSS merge with BSSID %pM\n", | |
47846c9b | 378 | sdata->name, mgmt->bssid); |
46900298 JB |
379 | #endif |
380 | ieee80211_sta_join_ibss(sdata, bss); | |
09a08cff | 381 | supp_rates = ieee80211_sta_get_rates(local, elems, band); |
34e89507 JB |
382 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, |
383 | supp_rates, GFP_KERNEL); | |
46900298 JB |
384 | } |
385 | ||
386 | put_bss: | |
387 | ieee80211_rx_bss_put(local, bss); | |
388 | } | |
389 | ||
390 | /* | |
391 | * Add a new IBSS station, will also be called by the RX code when, | |
392 | * in IBSS mode, receiving a frame from a yet-unknown station, hence | |
393 | * must be callable in atomic context. | |
394 | */ | |
395 | struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, | |
34e89507 JB |
396 | u8 *bssid,u8 *addr, u32 supp_rates, |
397 | gfp_t gfp) | |
46900298 | 398 | { |
2e10d330 | 399 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
46900298 JB |
400 | struct ieee80211_local *local = sdata->local; |
401 | struct sta_info *sta; | |
402 | int band = local->hw.conf.channel->band; | |
403 | ||
af8cdcd8 JB |
404 | /* |
405 | * XXX: Consider removing the least recently used entry and | |
406 | * allow new one to be added. | |
407 | */ | |
46900298 | 408 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { |
af8cdcd8 JB |
409 | if (net_ratelimit()) |
410 | printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n", | |
47846c9b | 411 | sdata->name, addr); |
46900298 JB |
412 | return NULL; |
413 | } | |
414 | ||
2e10d330 FF |
415 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) |
416 | return NULL; | |
417 | ||
46900298 JB |
418 | if (compare_ether_addr(bssid, sdata->u.ibss.bssid)) |
419 | return NULL; | |
420 | ||
421 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
422 | printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n", | |
47846c9b | 423 | wiphy_name(local->hw.wiphy), addr, sdata->name); |
46900298 JB |
424 | #endif |
425 | ||
34e89507 | 426 | sta = sta_info_alloc(sdata, addr, gfp); |
46900298 JB |
427 | if (!sta) |
428 | return NULL; | |
429 | ||
430 | set_sta_flags(sta, WLAN_STA_AUTHORIZED); | |
431 | ||
432 | /* make sure mandatory rates are always added */ | |
433 | sta->sta.supp_rates[band] = supp_rates | | |
434 | ieee80211_mandatory_rates(local, band); | |
435 | ||
436 | rate_control_rate_init(sta); | |
437 | ||
34e89507 | 438 | /* If it fails, maybe we raced another insertion? */ |
46900298 | 439 | if (sta_info_insert(sta)) |
34e89507 | 440 | return sta_info_get(sdata, addr); |
46900298 JB |
441 | return sta; |
442 | } | |
443 | ||
444 | static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) | |
445 | { | |
446 | struct ieee80211_local *local = sdata->local; | |
447 | int active = 0; | |
448 | struct sta_info *sta; | |
449 | ||
450 | rcu_read_lock(); | |
451 | ||
452 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
453 | if (sta->sdata == sdata && | |
454 | time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL, | |
455 | jiffies)) { | |
456 | active++; | |
457 | break; | |
458 | } | |
459 | } | |
460 | ||
461 | rcu_read_unlock(); | |
462 | ||
463 | return active; | |
464 | } | |
465 | ||
ce9058ae BP |
466 | /* |
467 | * This function is called with state == IEEE80211_IBSS_MLME_JOINED | |
468 | */ | |
46900298 JB |
469 | |
470 | static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) | |
471 | { | |
472 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
473 | ||
af8cdcd8 JB |
474 | mod_timer(&ifibss->timer, |
475 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 JB |
476 | |
477 | ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT); | |
af8cdcd8 | 478 | |
450aae3d S |
479 | if (time_before(jiffies, ifibss->last_scan_completed + |
480 | IEEE80211_IBSS_MERGE_INTERVAL)) | |
481 | return; | |
482 | ||
46900298 JB |
483 | if (ieee80211_sta_active_ibss(sdata)) |
484 | return; | |
485 | ||
af8cdcd8 | 486 | if (ifibss->fixed_channel) |
46900298 JB |
487 | return; |
488 | ||
489 | printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other " | |
47846c9b | 490 | "IBSS networks with same SSID (merge)\n", sdata->name); |
46900298 | 491 | |
be4a4b6a JB |
492 | ieee80211_request_internal_scan(sdata, |
493 | ifibss->ssid, ifibss->ssid_len, | |
494 | ifibss->fixed_channel ? ifibss->channel : NULL); | |
46900298 JB |
495 | } |
496 | ||
af8cdcd8 | 497 | static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
498 | { |
499 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
500 | struct ieee80211_local *local = sdata->local; | |
501 | struct ieee80211_supported_band *sband; | |
46900298 | 502 | u8 bssid[ETH_ALEN]; |
46900298 JB |
503 | u16 capability; |
504 | int i; | |
505 | ||
af8cdcd8 | 506 | if (ifibss->fixed_bssid) { |
46900298 JB |
507 | memcpy(bssid, ifibss->bssid, ETH_ALEN); |
508 | } else { | |
509 | /* Generate random, not broadcast, locally administered BSSID. Mix in | |
510 | * own MAC address to make sure that devices that do not have proper | |
511 | * random number generator get different BSSID. */ | |
512 | get_random_bytes(bssid, ETH_ALEN); | |
513 | for (i = 0; i < ETH_ALEN; i++) | |
47846c9b | 514 | bssid[i] ^= sdata->vif.addr[i]; |
46900298 JB |
515 | bssid[0] &= ~0x01; |
516 | bssid[0] |= 0x02; | |
517 | } | |
518 | ||
519 | printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n", | |
47846c9b | 520 | sdata->name, bssid); |
46900298 | 521 | |
af8cdcd8 | 522 | sband = local->hw.wiphy->bands[ifibss->channel->band]; |
46900298 | 523 | |
46900298 JB |
524 | capability = WLAN_CAPABILITY_IBSS; |
525 | ||
fffd0934 | 526 | if (ifibss->privacy) |
46900298 JB |
527 | capability |= WLAN_CAPABILITY_PRIVACY; |
528 | else | |
529 | sdata->drop_unencrypted = 0; | |
530 | ||
57c4d7b4 | 531 | __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, |
b59066a2 JB |
532 | ifibss->channel, 3, /* first two are basic */ |
533 | capability, 0); | |
46900298 JB |
534 | } |
535 | ||
ce9058ae BP |
536 | /* |
537 | * This function is called with state == IEEE80211_IBSS_MLME_SEARCH | |
538 | */ | |
539 | ||
af8cdcd8 | 540 | static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
541 | { |
542 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
543 | struct ieee80211_local *local = sdata->local; | |
0c1ad2ca | 544 | struct cfg80211_bss *cbss; |
af8cdcd8 | 545 | struct ieee80211_channel *chan = NULL; |
46900298 JB |
546 | const u8 *bssid = NULL; |
547 | int active_ibss; | |
e0d61887 | 548 | u16 capability; |
46900298 | 549 | |
46900298 JB |
550 | active_ibss = ieee80211_sta_active_ibss(sdata); |
551 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
552 | printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n", | |
47846c9b | 553 | sdata->name, active_ibss); |
46900298 JB |
554 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
555 | ||
556 | if (active_ibss) | |
af8cdcd8 | 557 | return; |
46900298 | 558 | |
e0d61887 | 559 | capability = WLAN_CAPABILITY_IBSS; |
fffd0934 | 560 | if (ifibss->privacy) |
e0d61887 | 561 | capability |= WLAN_CAPABILITY_PRIVACY; |
af8cdcd8 JB |
562 | if (ifibss->fixed_bssid) |
563 | bssid = ifibss->bssid; | |
564 | if (ifibss->fixed_channel) | |
565 | chan = ifibss->channel; | |
566 | if (!is_zero_ether_addr(ifibss->bssid)) | |
46900298 | 567 | bssid = ifibss->bssid; |
0c1ad2ca JB |
568 | cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, |
569 | ifibss->ssid, ifibss->ssid_len, | |
570 | WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY, | |
571 | capability); | |
572 | ||
573 | if (cbss) { | |
574 | struct ieee80211_bss *bss; | |
46900298 | 575 | |
0c1ad2ca | 576 | bss = (void *)cbss->priv; |
46900298 | 577 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
46900298 | 578 | printk(KERN_DEBUG " sta_find_ibss: selected %pM current " |
0c1ad2ca | 579 | "%pM\n", cbss->bssid, ifibss->bssid); |
46900298 JB |
580 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
581 | ||
46900298 JB |
582 | printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM" |
583 | " based on configured SSID\n", | |
0c1ad2ca | 584 | sdata->name, cbss->bssid); |
46900298 | 585 | |
af8cdcd8 | 586 | ieee80211_sta_join_ibss(sdata, bss); |
46900298 | 587 | ieee80211_rx_bss_put(local, bss); |
af8cdcd8 | 588 | return; |
d419b9f0 | 589 | } |
46900298 JB |
590 | |
591 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
592 | printk(KERN_DEBUG " did not try to join ibss\n"); | |
593 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ | |
594 | ||
595 | /* Selected IBSS not found in current scan results - try to scan */ | |
ce9058ae | 596 | if (time_after(jiffies, ifibss->last_scan_completed + |
46900298 JB |
597 | IEEE80211_SCAN_INTERVAL)) { |
598 | printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to " | |
47846c9b | 599 | "join\n", sdata->name); |
46900298 | 600 | |
be4a4b6a JB |
601 | ieee80211_request_internal_scan(sdata, |
602 | ifibss->ssid, ifibss->ssid_len, | |
603 | ifibss->fixed_channel ? ifibss->channel : NULL); | |
ce9058ae | 604 | } else { |
46900298 JB |
605 | int interval = IEEE80211_SCAN_INTERVAL; |
606 | ||
607 | if (time_after(jiffies, ifibss->ibss_join_req + | |
608 | IEEE80211_IBSS_JOIN_TIMEOUT)) { | |
af8cdcd8 JB |
609 | if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) { |
610 | ieee80211_sta_create_ibss(sdata); | |
611 | return; | |
612 | } | |
46900298 | 613 | printk(KERN_DEBUG "%s: IBSS not allowed on" |
47846c9b | 614 | " %d MHz\n", sdata->name, |
46900298 JB |
615 | local->hw.conf.channel->center_freq); |
616 | ||
617 | /* No IBSS found - decrease scan interval and continue | |
618 | * scanning. */ | |
619 | interval = IEEE80211_SCAN_INTERVAL_SLOW; | |
620 | } | |
621 | ||
af8cdcd8 JB |
622 | mod_timer(&ifibss->timer, |
623 | round_jiffies(jiffies + interval)); | |
46900298 | 624 | } |
46900298 JB |
625 | } |
626 | ||
627 | static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, | |
628 | struct ieee80211_mgmt *mgmt, | |
629 | size_t len) | |
630 | { | |
631 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
632 | struct ieee80211_local *local = sdata->local; | |
633 | int tx_last_beacon; | |
634 | struct sk_buff *skb; | |
635 | struct ieee80211_mgmt *resp; | |
636 | u8 *pos, *end; | |
637 | ||
638 | if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || | |
af8cdcd8 | 639 | len < 24 + 2 || !ifibss->presp) |
46900298 JB |
640 | return; |
641 | ||
24487981 | 642 | tx_last_beacon = drv_tx_last_beacon(local); |
46900298 JB |
643 | |
644 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
645 | printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM" | |
646 | " (tx_last_beacon=%d)\n", | |
47846c9b | 647 | sdata->name, mgmt->sa, mgmt->da, |
46900298 JB |
648 | mgmt->bssid, tx_last_beacon); |
649 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ | |
650 | ||
651 | if (!tx_last_beacon) | |
652 | return; | |
653 | ||
654 | if (memcmp(mgmt->bssid, ifibss->bssid, ETH_ALEN) != 0 && | |
655 | memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0) | |
656 | return; | |
657 | ||
658 | end = ((u8 *) mgmt) + len; | |
659 | pos = mgmt->u.probe_req.variable; | |
660 | if (pos[0] != WLAN_EID_SSID || | |
661 | pos + 2 + pos[1] > end) { | |
662 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
663 | printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq " | |
664 | "from %pM\n", | |
47846c9b | 665 | sdata->name, mgmt->sa); |
46900298 JB |
666 | #endif |
667 | return; | |
668 | } | |
669 | if (pos[1] != 0 && | |
670 | (pos[1] != ifibss->ssid_len || | |
0da780c2 | 671 | memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { |
46900298 JB |
672 | /* Ignore ProbeReq for foreign SSID */ |
673 | return; | |
674 | } | |
675 | ||
676 | /* Reply with ProbeResp */ | |
af8cdcd8 | 677 | skb = skb_copy(ifibss->presp, GFP_KERNEL); |
46900298 JB |
678 | if (!skb) |
679 | return; | |
680 | ||
681 | resp = (struct ieee80211_mgmt *) skb->data; | |
682 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
683 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
684 | printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n", | |
47846c9b | 685 | sdata->name, resp->da); |
46900298 | 686 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
62ae67be JB |
687 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
688 | ieee80211_tx_skb(sdata, skb); | |
46900298 JB |
689 | } |
690 | ||
691 | static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, | |
692 | struct ieee80211_mgmt *mgmt, | |
693 | size_t len, | |
694 | struct ieee80211_rx_status *rx_status) | |
695 | { | |
696 | size_t baselen; | |
697 | struct ieee802_11_elems elems; | |
698 | ||
47846c9b | 699 | if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN)) |
46900298 JB |
700 | return; /* ignore ProbeResp to foreign address */ |
701 | ||
702 | baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; | |
703 | if (baselen > len) | |
704 | return; | |
705 | ||
706 | ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, | |
707 | &elems); | |
708 | ||
709 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); | |
710 | } | |
711 | ||
712 | static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, | |
713 | struct ieee80211_mgmt *mgmt, | |
714 | size_t len, | |
715 | struct ieee80211_rx_status *rx_status) | |
716 | { | |
717 | size_t baselen; | |
718 | struct ieee802_11_elems elems; | |
719 | ||
720 | /* Process beacon from the current BSS */ | |
721 | baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; | |
722 | if (baselen > len) | |
723 | return; | |
724 | ||
725 | ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems); | |
726 | ||
727 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true); | |
728 | } | |
729 | ||
730 | static void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, | |
731 | struct sk_buff *skb) | |
732 | { | |
733 | struct ieee80211_rx_status *rx_status; | |
734 | struct ieee80211_mgmt *mgmt; | |
735 | u16 fc; | |
736 | ||
f1d58c25 | 737 | rx_status = IEEE80211_SKB_RXCB(skb); |
46900298 JB |
738 | mgmt = (struct ieee80211_mgmt *) skb->data; |
739 | fc = le16_to_cpu(mgmt->frame_control); | |
740 | ||
741 | switch (fc & IEEE80211_FCTL_STYPE) { | |
742 | case IEEE80211_STYPE_PROBE_REQ: | |
743 | ieee80211_rx_mgmt_probe_req(sdata, mgmt, skb->len); | |
744 | break; | |
745 | case IEEE80211_STYPE_PROBE_RESP: | |
746 | ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, | |
747 | rx_status); | |
748 | break; | |
749 | case IEEE80211_STYPE_BEACON: | |
750 | ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, | |
751 | rx_status); | |
752 | break; | |
753 | case IEEE80211_STYPE_AUTH: | |
754 | ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); | |
755 | break; | |
756 | } | |
757 | ||
758 | kfree_skb(skb); | |
759 | } | |
760 | ||
761 | static void ieee80211_ibss_work(struct work_struct *work) | |
762 | { | |
763 | struct ieee80211_sub_if_data *sdata = | |
764 | container_of(work, struct ieee80211_sub_if_data, u.ibss.work); | |
765 | struct ieee80211_local *local = sdata->local; | |
766 | struct ieee80211_if_ibss *ifibss; | |
767 | struct sk_buff *skb; | |
768 | ||
5bb644a0 JB |
769 | if (WARN_ON(local->suspended)) |
770 | return; | |
771 | ||
9607e6b6 | 772 | if (!ieee80211_sdata_running(sdata)) |
46900298 JB |
773 | return; |
774 | ||
fbe9c429 | 775 | if (local->scanning) |
46900298 JB |
776 | return; |
777 | ||
778 | if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_ADHOC)) | |
779 | return; | |
780 | ifibss = &sdata->u.ibss; | |
781 | ||
782 | while ((skb = skb_dequeue(&ifibss->skb_queue))) | |
783 | ieee80211_ibss_rx_queued_mgmt(sdata, skb); | |
784 | ||
785 | if (!test_and_clear_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request)) | |
786 | return; | |
787 | ||
788 | switch (ifibss->state) { | |
789 | case IEEE80211_IBSS_MLME_SEARCH: | |
790 | ieee80211_sta_find_ibss(sdata); | |
791 | break; | |
792 | case IEEE80211_IBSS_MLME_JOINED: | |
793 | ieee80211_sta_merge_ibss(sdata); | |
794 | break; | |
795 | default: | |
796 | WARN_ON(1); | |
797 | break; | |
798 | } | |
799 | } | |
800 | ||
801 | static void ieee80211_ibss_timer(unsigned long data) | |
802 | { | |
803 | struct ieee80211_sub_if_data *sdata = | |
804 | (struct ieee80211_sub_if_data *) data; | |
805 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
806 | struct ieee80211_local *local = sdata->local; | |
807 | ||
5bb644a0 JB |
808 | if (local->quiescing) { |
809 | ifibss->timer_running = true; | |
810 | return; | |
811 | } | |
812 | ||
46900298 | 813 | set_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request); |
42935eca | 814 | ieee80211_queue_work(&local->hw, &ifibss->work); |
46900298 JB |
815 | } |
816 | ||
5bb644a0 JB |
817 | #ifdef CONFIG_PM |
818 | void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata) | |
819 | { | |
820 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
821 | ||
822 | cancel_work_sync(&ifibss->work); | |
823 | if (del_timer_sync(&ifibss->timer)) | |
824 | ifibss->timer_running = true; | |
825 | } | |
826 | ||
827 | void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata) | |
828 | { | |
829 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
830 | ||
831 | if (ifibss->timer_running) { | |
832 | add_timer(&ifibss->timer); | |
833 | ifibss->timer_running = false; | |
834 | } | |
835 | } | |
836 | #endif | |
837 | ||
46900298 JB |
838 | void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) |
839 | { | |
840 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
841 | ||
842 | INIT_WORK(&ifibss->work, ieee80211_ibss_work); | |
843 | setup_timer(&ifibss->timer, ieee80211_ibss_timer, | |
844 | (unsigned long) sdata); | |
845 | skb_queue_head_init(&ifibss->skb_queue); | |
46900298 JB |
846 | } |
847 | ||
848 | /* scan finished notification */ | |
849 | void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) | |
850 | { | |
af8cdcd8 | 851 | struct ieee80211_sub_if_data *sdata; |
46900298 | 852 | |
29b4a4f7 JB |
853 | mutex_lock(&local->iflist_mtx); |
854 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 855 | if (!ieee80211_sdata_running(sdata)) |
0e41f715 | 856 | continue; |
af8cdcd8 JB |
857 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
858 | continue; | |
0e41f715 JB |
859 | if (!sdata->u.ibss.ssid_len) |
860 | continue; | |
af8cdcd8 | 861 | sdata->u.ibss.last_scan_completed = jiffies; |
51f98f13 | 862 | mod_timer(&sdata->u.ibss.timer, 0); |
46900298 | 863 | } |
29b4a4f7 | 864 | mutex_unlock(&local->iflist_mtx); |
46900298 JB |
865 | } |
866 | ||
867 | ieee80211_rx_result | |
f1d58c25 | 868 | ieee80211_ibss_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) |
46900298 JB |
869 | { |
870 | struct ieee80211_local *local = sdata->local; | |
871 | struct ieee80211_mgmt *mgmt; | |
872 | u16 fc; | |
873 | ||
874 | if (skb->len < 24) | |
875 | return RX_DROP_MONITOR; | |
876 | ||
877 | mgmt = (struct ieee80211_mgmt *) skb->data; | |
878 | fc = le16_to_cpu(mgmt->frame_control); | |
879 | ||
880 | switch (fc & IEEE80211_FCTL_STYPE) { | |
881 | case IEEE80211_STYPE_PROBE_RESP: | |
882 | case IEEE80211_STYPE_BEACON: | |
46900298 JB |
883 | case IEEE80211_STYPE_PROBE_REQ: |
884 | case IEEE80211_STYPE_AUTH: | |
885 | skb_queue_tail(&sdata->u.ibss.skb_queue, skb); | |
42935eca | 886 | ieee80211_queue_work(&local->hw, &sdata->u.ibss.work); |
46900298 JB |
887 | return RX_QUEUED; |
888 | } | |
889 | ||
890 | return RX_DROP_MONITOR; | |
891 | } | |
af8cdcd8 JB |
892 | |
893 | int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, | |
894 | struct cfg80211_ibss_params *params) | |
895 | { | |
896 | struct sk_buff *skb; | |
897 | ||
af8cdcd8 JB |
898 | if (params->bssid) { |
899 | memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); | |
900 | sdata->u.ibss.fixed_bssid = true; | |
901 | } else | |
902 | sdata->u.ibss.fixed_bssid = false; | |
903 | ||
fffd0934 JB |
904 | sdata->u.ibss.privacy = params->privacy; |
905 | ||
57c4d7b4 JB |
906 | sdata->vif.bss_conf.beacon_int = params->beacon_interval; |
907 | ||
af8cdcd8 JB |
908 | sdata->u.ibss.channel = params->channel; |
909 | sdata->u.ibss.fixed_channel = params->channel_fixed; | |
910 | ||
adfba3c7 JB |
911 | /* fix ourselves to that channel now already */ |
912 | if (params->channel_fixed) { | |
913 | sdata->local->oper_channel = params->channel; | |
0aaffa9b JB |
914 | WARN_ON(!ieee80211_set_channel_type(sdata->local, sdata, |
915 | NL80211_CHAN_NO_HT)); | |
adfba3c7 JB |
916 | } |
917 | ||
af8cdcd8 JB |
918 | if (params->ie) { |
919 | sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, | |
920 | GFP_KERNEL); | |
921 | if (sdata->u.ibss.ie) | |
922 | sdata->u.ibss.ie_len = params->ie_len; | |
923 | } | |
924 | ||
925 | skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + | |
926 | 36 /* bitrates */ + | |
927 | 34 /* SSID */ + | |
928 | 3 /* DS params */ + | |
929 | 4 /* IBSS params */ + | |
930 | params->ie_len); | |
931 | if (!skb) | |
932 | return -ENOMEM; | |
933 | ||
934 | sdata->u.ibss.skb = skb; | |
935 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; | |
936 | sdata->u.ibss.ibss_join_req = jiffies; | |
937 | ||
0e41f715 JB |
938 | memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN); |
939 | ||
940 | /* | |
941 | * The ssid_len setting below is used to see whether | |
942 | * we are active, and we need all other settings | |
943 | * before that may get visible. | |
944 | */ | |
945 | mb(); | |
946 | ||
947 | sdata->u.ibss.ssid_len = params->ssid_len; | |
948 | ||
5cff20e6 JB |
949 | ieee80211_recalc_idle(sdata->local); |
950 | ||
af8cdcd8 | 951 | set_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request); |
42935eca | 952 | ieee80211_queue_work(&sdata->local->hw, &sdata->u.ibss.work); |
af8cdcd8 JB |
953 | |
954 | return 0; | |
955 | } | |
956 | ||
957 | int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) | |
958 | { | |
959 | struct sk_buff *skb; | |
960 | ||
961 | del_timer_sync(&sdata->u.ibss.timer); | |
962 | clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request); | |
963 | cancel_work_sync(&sdata->u.ibss.work); | |
964 | clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request); | |
965 | ||
966 | sta_info_flush(sdata->local, sdata); | |
967 | ||
968 | /* remove beacon */ | |
969 | kfree(sdata->u.ibss.ie); | |
970 | skb = sdata->u.ibss.presp; | |
971 | rcu_assign_pointer(sdata->u.ibss.presp, NULL); | |
8fc214ba JB |
972 | sdata->vif.bss_conf.ibss_joined = false; |
973 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | | |
974 | BSS_CHANGED_IBSS); | |
af8cdcd8 JB |
975 | synchronize_rcu(); |
976 | kfree_skb(skb); | |
977 | ||
978 | skb_queue_purge(&sdata->u.ibss.skb_queue); | |
979 | memset(sdata->u.ibss.bssid, 0, ETH_ALEN); | |
5cff20e6 JB |
980 | sdata->u.ibss.ssid_len = 0; |
981 | ||
982 | ieee80211_recalc_idle(sdata->local); | |
af8cdcd8 JB |
983 | |
984 | return 0; | |
985 | } |