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) | |
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 | { | |
0915cba3 | 43 | u16 auth_alg, auth_transaction; |
46900298 | 44 | |
7a17a33c JB |
45 | lockdep_assert_held(&sdata->u.ibss.mtx); |
46 | ||
46900298 JB |
47 | if (len < 24 + 6) |
48 | return; | |
49 | ||
50 | auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); | |
51 | auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); | |
46900298 JB |
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]; |
13c40c54 | 80 | enum nl80211_channel_type channel_type; |
24487981 | 81 | |
7a17a33c JB |
82 | lockdep_assert_held(&ifibss->mtx); |
83 | ||
24487981 | 84 | /* Reset own TSF to allow time synchronization work. */ |
37a41b4a | 85 | drv_reset_tsf(local, sdata); |
46900298 | 86 | |
af8cdcd8 | 87 | skb = ifibss->skb; |
a9b3cd7f | 88 | RCU_INIT_POINTER(ifibss->presp, NULL); |
af8cdcd8 JB |
89 | synchronize_rcu(); |
90 | skb->data = skb->head; | |
91 | skb->len = 0; | |
92 | skb_reset_tail_pointer(skb); | |
93 | skb_reserve(skb, sdata->local->hw.extra_tx_headroom); | |
46900298 | 94 | |
af8cdcd8 JB |
95 | if (memcmp(ifibss->bssid, bssid, ETH_ALEN)) |
96 | sta_info_flush(sdata->local, sdata); | |
46900298 | 97 | |
49b5c7f4 JB |
98 | /* if merging, indicate to driver that we leave the old IBSS */ |
99 | if (sdata->vif.bss_conf.ibss_joined) { | |
100 | sdata->vif.bss_conf.ibss_joined = false; | |
86a2ea41 | 101 | netif_carrier_off(sdata->dev); |
49b5c7f4 JB |
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 | |
13c40c54 AS |
109 | channel_type = ifibss->channel_type; |
110 | if (channel_type > NL80211_CHAN_HT20 && | |
111 | !cfg80211_can_beacon_sec_chan(local->hw.wiphy, chan, channel_type)) | |
112 | channel_type = NL80211_CHAN_HT20; | |
113 | if (!ieee80211_set_channel_type(local, sdata, channel_type)) { | |
114 | /* can only fail due to HT40+/- mismatch */ | |
115 | channel_type = NL80211_CHAN_HT20; | |
116 | WARN_ON(!ieee80211_set_channel_type(local, sdata, | |
117 | NL80211_CHAN_HT20)); | |
118 | } | |
af8cdcd8 | 119 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); |
57c4d7b4 | 120 | |
af8cdcd8 | 121 | sband = local->hw.wiphy->bands[chan->band]; |
46900298 | 122 | |
b59066a2 JB |
123 | /* build supported rates array */ |
124 | pos = supp_rates; | |
125 | for (i = 0; i < sband->n_bitrates; i++) { | |
126 | int rate = sband->bitrates[i].bitrate; | |
127 | u8 basic = 0; | |
128 | if (basic_rates & BIT(i)) | |
129 | basic = 0x80; | |
130 | *pos++ = basic | (u8) (rate / 5); | |
131 | } | |
132 | ||
46900298 | 133 | /* Build IBSS probe response */ |
af8cdcd8 | 134 | mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon)); |
46900298 JB |
135 | memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon)); |
136 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | | |
137 | IEEE80211_STYPE_PROBE_RESP); | |
138 | memset(mgmt->da, 0xff, ETH_ALEN); | |
47846c9b | 139 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
46900298 | 140 | memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN); |
57c4d7b4 | 141 | mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int); |
707c1b4e | 142 | mgmt->u.beacon.timestamp = cpu_to_le64(tsf); |
46900298 JB |
143 | mgmt->u.beacon.capab_info = cpu_to_le16(capability); |
144 | ||
145 | pos = skb_put(skb, 2 + ifibss->ssid_len); | |
146 | *pos++ = WLAN_EID_SSID; | |
147 | *pos++ = ifibss->ssid_len; | |
148 | memcpy(pos, ifibss->ssid, ifibss->ssid_len); | |
149 | ||
b59066a2 | 150 | rates = sband->n_bitrates; |
46900298 JB |
151 | if (rates > 8) |
152 | rates = 8; | |
153 | pos = skb_put(skb, 2 + rates); | |
154 | *pos++ = WLAN_EID_SUPP_RATES; | |
155 | *pos++ = rates; | |
156 | memcpy(pos, supp_rates, rates); | |
157 | ||
158 | if (sband->band == IEEE80211_BAND_2GHZ) { | |
159 | pos = skb_put(skb, 2 + 1); | |
160 | *pos++ = WLAN_EID_DS_PARAMS; | |
161 | *pos++ = 1; | |
af8cdcd8 | 162 | *pos++ = ieee80211_frequency_to_channel(chan->center_freq); |
46900298 JB |
163 | } |
164 | ||
165 | pos = skb_put(skb, 2 + 2); | |
166 | *pos++ = WLAN_EID_IBSS_PARAMS; | |
167 | *pos++ = 2; | |
168 | /* FIX: set ATIM window based on scan results */ | |
169 | *pos++ = 0; | |
170 | *pos++ = 0; | |
171 | ||
b59066a2 JB |
172 | if (sband->n_bitrates > 8) { |
173 | rates = sband->n_bitrates - 8; | |
46900298 JB |
174 | pos = skb_put(skb, 2 + rates); |
175 | *pos++ = WLAN_EID_EXT_SUPP_RATES; | |
176 | *pos++ = rates; | |
177 | memcpy(pos, &supp_rates[8], rates); | |
178 | } | |
179 | ||
af8cdcd8 JB |
180 | if (ifibss->ie_len) |
181 | memcpy(skb_put(skb, ifibss->ie_len), | |
182 | ifibss->ie, ifibss->ie_len); | |
183 | ||
13c40c54 AS |
184 | /* add HT capability and information IEs */ |
185 | if (channel_type && sband->ht_cap.ht_supported) { | |
186 | pos = skb_put(skb, 4 + | |
187 | sizeof(struct ieee80211_ht_cap) + | |
188 | sizeof(struct ieee80211_ht_info)); | |
189 | pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, | |
190 | sband->ht_cap.cap); | |
191 | pos = ieee80211_ie_build_ht_info(pos, | |
192 | &sband->ht_cap, | |
193 | chan, | |
194 | channel_type); | |
195 | } | |
196 | ||
9eba6125 BR |
197 | if (local->hw.queues >= 4) { |
198 | pos = skb_put(skb, 9); | |
199 | *pos++ = WLAN_EID_VENDOR_SPECIFIC; | |
200 | *pos++ = 7; /* len */ | |
201 | *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */ | |
202 | *pos++ = 0x50; | |
203 | *pos++ = 0xf2; | |
204 | *pos++ = 2; /* WME */ | |
205 | *pos++ = 0; /* WME info */ | |
206 | *pos++ = 1; /* WME ver */ | |
207 | *pos++ = 0; /* U-APSD no in use */ | |
208 | } | |
209 | ||
a9b3cd7f | 210 | RCU_INIT_POINTER(ifibss->presp, skb); |
46900298 | 211 | |
2d0ddec5 | 212 | sdata->vif.bss_conf.beacon_int = beacon_int; |
fbd2c8dc | 213 | sdata->vif.bss_conf.basic_rates = basic_rates; |
2d0ddec5 JB |
214 | bss_change = BSS_CHANGED_BEACON_INT; |
215 | bss_change |= ieee80211_reset_erp_info(sdata); | |
216 | bss_change |= BSS_CHANGED_BSSID; | |
217 | bss_change |= BSS_CHANGED_BEACON; | |
218 | bss_change |= BSS_CHANGED_BEACON_ENABLED; | |
392cfdb1 | 219 | bss_change |= BSS_CHANGED_BASIC_RATES; |
13c40c54 | 220 | bss_change |= BSS_CHANGED_HT; |
8fc214ba JB |
221 | bss_change |= BSS_CHANGED_IBSS; |
222 | sdata->vif.bss_conf.ibss_joined = true; | |
2d0ddec5 | 223 | ieee80211_bss_info_change_notify(sdata, bss_change); |
46900298 | 224 | |
b59066a2 | 225 | ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates); |
46900298 | 226 | |
46900298 | 227 | ifibss->state = IEEE80211_IBSS_MLME_JOINED; |
af8cdcd8 JB |
228 | mod_timer(&ifibss->timer, |
229 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 | 230 | |
f446d10f JB |
231 | bss = cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel, |
232 | mgmt, skb->len, 0, GFP_KERNEL); | |
233 | cfg80211_put_bss(bss); | |
86a2ea41 | 234 | netif_carrier_on(sdata->dev); |
af8cdcd8 | 235 | cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL); |
46900298 JB |
236 | } |
237 | ||
af8cdcd8 JB |
238 | static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
239 | struct ieee80211_bss *bss) | |
46900298 | 240 | { |
0c1ad2ca JB |
241 | struct cfg80211_bss *cbss = |
242 | container_of((void *)bss, struct cfg80211_bss, priv); | |
b59066a2 JB |
243 | struct ieee80211_supported_band *sband; |
244 | u32 basic_rates; | |
245 | int i, j; | |
0c1ad2ca | 246 | u16 beacon_int = cbss->beacon_interval; |
57c4d7b4 | 247 | |
7a17a33c JB |
248 | lockdep_assert_held(&sdata->u.ibss.mtx); |
249 | ||
57c4d7b4 JB |
250 | if (beacon_int < 10) |
251 | beacon_int = 10; | |
252 | ||
0c1ad2ca | 253 | sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; |
b59066a2 JB |
254 | |
255 | basic_rates = 0; | |
256 | ||
257 | for (i = 0; i < bss->supp_rates_len; i++) { | |
258 | int rate = (bss->supp_rates[i] & 0x7f) * 5; | |
259 | bool is_basic = !!(bss->supp_rates[i] & 0x80); | |
260 | ||
261 | for (j = 0; j < sband->n_bitrates; j++) { | |
262 | if (sband->bitrates[j].bitrate == rate) { | |
263 | if (is_basic) | |
264 | basic_rates |= BIT(j); | |
265 | break; | |
266 | } | |
267 | } | |
268 | } | |
269 | ||
0c1ad2ca | 270 | __ieee80211_sta_join_ibss(sdata, cbss->bssid, |
57c4d7b4 | 271 | beacon_int, |
0c1ad2ca | 272 | cbss->channel, |
b59066a2 | 273 | basic_rates, |
0c1ad2ca JB |
274 | cbss->capability, |
275 | cbss->tsf); | |
46900298 JB |
276 | } |
277 | ||
278 | static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, | |
279 | struct ieee80211_mgmt *mgmt, | |
280 | size_t len, | |
281 | struct ieee80211_rx_status *rx_status, | |
282 | struct ieee802_11_elems *elems, | |
283 | bool beacon) | |
284 | { | |
285 | struct ieee80211_local *local = sdata->local; | |
286 | int freq; | |
0c1ad2ca | 287 | struct cfg80211_bss *cbss; |
46900298 JB |
288 | struct ieee80211_bss *bss; |
289 | struct sta_info *sta; | |
290 | struct ieee80211_channel *channel; | |
291 | u64 beacon_timestamp, rx_timestamp; | |
292 | u32 supp_rates = 0; | |
293 | enum ieee80211_band band = rx_status->band; | |
13c40c54 AS |
294 | struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; |
295 | bool rates_updated = false; | |
46900298 JB |
296 | |
297 | if (elems->ds_params && elems->ds_params_len == 1) | |
59eb21a6 BR |
298 | freq = ieee80211_channel_to_frequency(elems->ds_params[0], |
299 | band); | |
46900298 JB |
300 | else |
301 | freq = rx_status->freq; | |
302 | ||
303 | channel = ieee80211_get_channel(local->hw.wiphy, freq); | |
304 | ||
305 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
306 | return; | |
307 | ||
9eba6125 | 308 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC && |
46900298 | 309 | memcmp(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) { |
46900298 JB |
310 | |
311 | rcu_read_lock(); | |
abe60632 | 312 | sta = sta_info_get(sdata, mgmt->sa); |
46900298 | 313 | |
9eba6125 BR |
314 | if (elems->supp_rates) { |
315 | supp_rates = ieee80211_sta_get_rates(local, elems, | |
316 | band); | |
317 | if (sta) { | |
318 | u32 prev_rates; | |
319 | ||
320 | prev_rates = sta->sta.supp_rates[band]; | |
321 | /* make sure mandatory rates are always added */ | |
322 | sta->sta.supp_rates[band] = supp_rates | | |
323 | ieee80211_mandatory_rates(local, band); | |
46900298 | 324 | |
9eba6125 | 325 | if (sta->sta.supp_rates[band] != prev_rates) { |
46900298 | 326 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
9eba6125 BR |
327 | printk(KERN_DEBUG |
328 | "%s: updated supp_rates set " | |
329 | "for %pM based on beacon" | |
330 | "/probe_resp (0x%x -> 0x%x)\n", | |
331 | sdata->name, sta->sta.addr, | |
332 | prev_rates, | |
333 | sta->sta.supp_rates[band]); | |
46900298 | 334 | #endif |
13c40c54 | 335 | rates_updated = true; |
9eba6125 BR |
336 | } |
337 | } else | |
338 | sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, | |
339 | mgmt->sa, supp_rates, | |
340 | GFP_ATOMIC); | |
34e89507 | 341 | } |
9eba6125 BR |
342 | |
343 | if (sta && elems->wmm_info) | |
c2c98fde | 344 | set_sta_flag(sta, WLAN_STA_WME); |
9eba6125 | 345 | |
13c40c54 AS |
346 | if (sta && elems->ht_info_elem && elems->ht_cap_elem && |
347 | sdata->u.ibss.channel_type != NL80211_CHAN_NO_HT) { | |
348 | /* we both use HT */ | |
349 | struct ieee80211_sta_ht_cap sta_ht_cap_new; | |
350 | enum nl80211_channel_type channel_type = | |
351 | ieee80211_ht_info_to_channel_type( | |
352 | elems->ht_info_elem); | |
353 | ||
354 | ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, | |
355 | elems->ht_cap_elem, | |
356 | &sta_ht_cap_new); | |
357 | ||
358 | /* | |
359 | * fall back to HT20 if we don't use or use | |
360 | * the other extension channel | |
361 | */ | |
362 | if ((channel_type == NL80211_CHAN_HT40MINUS || | |
363 | channel_type == NL80211_CHAN_HT40PLUS) && | |
364 | channel_type != sdata->u.ibss.channel_type) | |
365 | sta_ht_cap_new.cap &= | |
366 | ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; | |
367 | ||
368 | if (memcmp(&sta->sta.ht_cap, &sta_ht_cap_new, | |
369 | sizeof(sta_ht_cap_new))) { | |
370 | memcpy(&sta->sta.ht_cap, &sta_ht_cap_new, | |
371 | sizeof(sta_ht_cap_new)); | |
372 | rates_updated = true; | |
373 | } | |
374 | } | |
375 | ||
376 | if (sta && rates_updated) | |
377 | rate_control_rate_init(sta); | |
378 | ||
9eba6125 | 379 | rcu_read_unlock(); |
46900298 JB |
380 | } |
381 | ||
382 | bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, | |
383 | channel, beacon); | |
384 | if (!bss) | |
385 | return; | |
386 | ||
0c1ad2ca JB |
387 | cbss = container_of((void *)bss, struct cfg80211_bss, priv); |
388 | ||
46900298 | 389 | /* was just updated in ieee80211_bss_info_update */ |
0c1ad2ca | 390 | beacon_timestamp = cbss->tsf; |
46900298 JB |
391 | |
392 | /* check if we need to merge IBSS */ | |
393 | ||
46900298 | 394 | /* we use a fixed BSSID */ |
a98bfec2 | 395 | if (sdata->u.ibss.fixed_bssid) |
46900298 JB |
396 | goto put_bss; |
397 | ||
398 | /* not an IBSS */ | |
0c1ad2ca | 399 | if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) |
46900298 JB |
400 | goto put_bss; |
401 | ||
402 | /* different channel */ | |
0c1ad2ca | 403 | if (cbss->channel != local->oper_channel) |
46900298 JB |
404 | goto put_bss; |
405 | ||
406 | /* different SSID */ | |
407 | if (elems->ssid_len != sdata->u.ibss.ssid_len || | |
408 | memcmp(elems->ssid, sdata->u.ibss.ssid, | |
409 | sdata->u.ibss.ssid_len)) | |
410 | goto put_bss; | |
411 | ||
34e8f082 | 412 | /* same BSSID */ |
0c1ad2ca | 413 | if (memcmp(cbss->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) |
34e8f082 AF |
414 | goto put_bss; |
415 | ||
6ebacbb7 | 416 | if (rx_status->flag & RX_FLAG_MACTIME_MPDU) { |
46900298 JB |
417 | /* |
418 | * For correct IBSS merging we need mactime; since mactime is | |
419 | * defined as the time the first data symbol of the frame hits | |
420 | * the PHY, and the timestamp of the beacon is defined as "the | |
421 | * time that the data symbol containing the first bit of the | |
422 | * timestamp is transmitted to the PHY plus the transmitting | |
423 | * STA's delays through its local PHY from the MAC-PHY | |
424 | * interface to its interface with the WM" (802.11 11.1.2) | |
425 | * - equals the time this bit arrives at the receiver - we have | |
426 | * to take into account the offset between the two. | |
427 | * | |
428 | * E.g. at 1 MBit that means mactime is 192 usec earlier | |
429 | * (=24 bytes * 8 usecs/byte) than the beacon timestamp. | |
430 | */ | |
431 | int rate; | |
432 | ||
433 | if (rx_status->flag & RX_FLAG_HT) | |
434 | rate = 65; /* TODO: HT rates */ | |
435 | else | |
436 | rate = local->hw.wiphy->bands[band]-> | |
437 | bitrates[rx_status->rate_idx].bitrate; | |
438 | ||
439 | rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate); | |
24487981 JB |
440 | } else { |
441 | /* | |
442 | * second best option: get current TSF | |
443 | * (will return -1 if not supported) | |
444 | */ | |
37a41b4a | 445 | rx_timestamp = drv_get_tsf(local, sdata); |
24487981 | 446 | } |
46900298 JB |
447 | |
448 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
449 | printk(KERN_DEBUG "RX beacon SA=%pM BSSID=" | |
450 | "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", | |
451 | mgmt->sa, mgmt->bssid, | |
452 | (unsigned long long)rx_timestamp, | |
453 | (unsigned long long)beacon_timestamp, | |
454 | (unsigned long long)(rx_timestamp - beacon_timestamp), | |
455 | jiffies); | |
456 | #endif | |
457 | ||
458 | if (beacon_timestamp > rx_timestamp) { | |
459 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
460 | printk(KERN_DEBUG "%s: beacon TSF higher than " | |
461 | "local TSF - IBSS merge with BSSID %pM\n", | |
47846c9b | 462 | sdata->name, mgmt->bssid); |
46900298 JB |
463 | #endif |
464 | ieee80211_sta_join_ibss(sdata, bss); | |
09a08cff | 465 | supp_rates = ieee80211_sta_get_rates(local, elems, band); |
34e89507 JB |
466 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, |
467 | supp_rates, GFP_KERNEL); | |
46900298 JB |
468 | } |
469 | ||
470 | put_bss: | |
471 | ieee80211_rx_bss_put(local, bss); | |
472 | } | |
473 | ||
474 | /* | |
475 | * Add a new IBSS station, will also be called by the RX code when, | |
476 | * in IBSS mode, receiving a frame from a yet-unknown station, hence | |
477 | * must be callable in atomic context. | |
478 | */ | |
479 | struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, | |
a7ce1c94 | 480 | u8 *bssid, u8 *addr, u32 supp_rates, |
34e89507 | 481 | gfp_t gfp) |
46900298 | 482 | { |
2e10d330 | 483 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
46900298 JB |
484 | struct ieee80211_local *local = sdata->local; |
485 | struct sta_info *sta; | |
486 | int band = local->hw.conf.channel->band; | |
487 | ||
af8cdcd8 JB |
488 | /* |
489 | * XXX: Consider removing the least recently used entry and | |
490 | * allow new one to be added. | |
491 | */ | |
46900298 | 492 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { |
af8cdcd8 JB |
493 | if (net_ratelimit()) |
494 | printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n", | |
47846c9b | 495 | sdata->name, addr); |
46900298 JB |
496 | return NULL; |
497 | } | |
498 | ||
2e10d330 FF |
499 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) |
500 | return NULL; | |
501 | ||
46900298 JB |
502 | if (compare_ether_addr(bssid, sdata->u.ibss.bssid)) |
503 | return NULL; | |
504 | ||
505 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
0fb9a9ec JP |
506 | wiphy_debug(local->hw.wiphy, "Adding new IBSS station %pM (dev=%s)\n", |
507 | addr, sdata->name); | |
46900298 JB |
508 | #endif |
509 | ||
34e89507 | 510 | sta = sta_info_alloc(sdata, addr, gfp); |
46900298 JB |
511 | if (!sta) |
512 | return NULL; | |
513 | ||
c8716d9d | 514 | sta->last_rx = jiffies; |
d9a7ddb0 JB |
515 | |
516 | sta_info_move_state(sta, IEEE80211_STA_AUTH); | |
517 | sta_info_move_state(sta, IEEE80211_STA_ASSOC); | |
518 | sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED); | |
46900298 JB |
519 | |
520 | /* make sure mandatory rates are always added */ | |
521 | sta->sta.supp_rates[band] = supp_rates | | |
522 | ieee80211_mandatory_rates(local, band); | |
523 | ||
524 | rate_control_rate_init(sta); | |
525 | ||
34e89507 | 526 | /* If it fails, maybe we raced another insertion? */ |
46900298 | 527 | if (sta_info_insert(sta)) |
34e89507 | 528 | return sta_info_get(sdata, addr); |
46900298 JB |
529 | return sta; |
530 | } | |
531 | ||
532 | static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) | |
533 | { | |
534 | struct ieee80211_local *local = sdata->local; | |
535 | int active = 0; | |
536 | struct sta_info *sta; | |
537 | ||
7a17a33c JB |
538 | lockdep_assert_held(&sdata->u.ibss.mtx); |
539 | ||
46900298 JB |
540 | rcu_read_lock(); |
541 | ||
542 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
543 | if (sta->sdata == sdata && | |
544 | time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL, | |
545 | jiffies)) { | |
546 | active++; | |
547 | break; | |
548 | } | |
549 | } | |
550 | ||
551 | rcu_read_unlock(); | |
552 | ||
553 | return active; | |
554 | } | |
555 | ||
ce9058ae BP |
556 | /* |
557 | * This function is called with state == IEEE80211_IBSS_MLME_JOINED | |
558 | */ | |
46900298 JB |
559 | |
560 | static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) | |
561 | { | |
562 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
563 | ||
7a17a33c JB |
564 | lockdep_assert_held(&ifibss->mtx); |
565 | ||
af8cdcd8 JB |
566 | mod_timer(&ifibss->timer, |
567 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 JB |
568 | |
569 | ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT); | |
af8cdcd8 | 570 | |
450aae3d S |
571 | if (time_before(jiffies, ifibss->last_scan_completed + |
572 | IEEE80211_IBSS_MERGE_INTERVAL)) | |
573 | return; | |
574 | ||
46900298 JB |
575 | if (ieee80211_sta_active_ibss(sdata)) |
576 | return; | |
577 | ||
af8cdcd8 | 578 | if (ifibss->fixed_channel) |
46900298 JB |
579 | return; |
580 | ||
581 | printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other " | |
47846c9b | 582 | "IBSS networks with same SSID (merge)\n", sdata->name); |
46900298 | 583 | |
be4a4b6a JB |
584 | ieee80211_request_internal_scan(sdata, |
585 | ifibss->ssid, ifibss->ssid_len, | |
586 | ifibss->fixed_channel ? ifibss->channel : NULL); | |
46900298 JB |
587 | } |
588 | ||
af8cdcd8 | 589 | static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
590 | { |
591 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
46900298 | 592 | u8 bssid[ETH_ALEN]; |
46900298 JB |
593 | u16 capability; |
594 | int i; | |
595 | ||
7a17a33c JB |
596 | lockdep_assert_held(&ifibss->mtx); |
597 | ||
af8cdcd8 | 598 | if (ifibss->fixed_bssid) { |
46900298 JB |
599 | memcpy(bssid, ifibss->bssid, ETH_ALEN); |
600 | } else { | |
601 | /* Generate random, not broadcast, locally administered BSSID. Mix in | |
602 | * own MAC address to make sure that devices that do not have proper | |
603 | * random number generator get different BSSID. */ | |
604 | get_random_bytes(bssid, ETH_ALEN); | |
605 | for (i = 0; i < ETH_ALEN; i++) | |
47846c9b | 606 | bssid[i] ^= sdata->vif.addr[i]; |
46900298 JB |
607 | bssid[0] &= ~0x01; |
608 | bssid[0] |= 0x02; | |
609 | } | |
610 | ||
611 | printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n", | |
47846c9b | 612 | sdata->name, bssid); |
46900298 | 613 | |
46900298 JB |
614 | capability = WLAN_CAPABILITY_IBSS; |
615 | ||
fffd0934 | 616 | if (ifibss->privacy) |
46900298 JB |
617 | capability |= WLAN_CAPABILITY_PRIVACY; |
618 | else | |
619 | sdata->drop_unencrypted = 0; | |
620 | ||
57c4d7b4 | 621 | __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, |
fbd2c8dc | 622 | ifibss->channel, ifibss->basic_rates, |
b59066a2 | 623 | capability, 0); |
46900298 JB |
624 | } |
625 | ||
ce9058ae BP |
626 | /* |
627 | * This function is called with state == IEEE80211_IBSS_MLME_SEARCH | |
628 | */ | |
629 | ||
af8cdcd8 | 630 | static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
631 | { |
632 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
633 | struct ieee80211_local *local = sdata->local; | |
0c1ad2ca | 634 | struct cfg80211_bss *cbss; |
af8cdcd8 | 635 | struct ieee80211_channel *chan = NULL; |
46900298 JB |
636 | const u8 *bssid = NULL; |
637 | int active_ibss; | |
e0d61887 | 638 | u16 capability; |
46900298 | 639 | |
7a17a33c JB |
640 | lockdep_assert_held(&ifibss->mtx); |
641 | ||
46900298 JB |
642 | active_ibss = ieee80211_sta_active_ibss(sdata); |
643 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
644 | printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n", | |
47846c9b | 645 | sdata->name, active_ibss); |
46900298 JB |
646 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
647 | ||
648 | if (active_ibss) | |
af8cdcd8 | 649 | return; |
46900298 | 650 | |
e0d61887 | 651 | capability = WLAN_CAPABILITY_IBSS; |
fffd0934 | 652 | if (ifibss->privacy) |
e0d61887 | 653 | capability |= WLAN_CAPABILITY_PRIVACY; |
af8cdcd8 JB |
654 | if (ifibss->fixed_bssid) |
655 | bssid = ifibss->bssid; | |
656 | if (ifibss->fixed_channel) | |
657 | chan = ifibss->channel; | |
658 | if (!is_zero_ether_addr(ifibss->bssid)) | |
46900298 | 659 | bssid = ifibss->bssid; |
0c1ad2ca JB |
660 | cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, |
661 | ifibss->ssid, ifibss->ssid_len, | |
662 | WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY, | |
663 | capability); | |
664 | ||
665 | if (cbss) { | |
666 | struct ieee80211_bss *bss; | |
46900298 | 667 | |
0c1ad2ca | 668 | bss = (void *)cbss->priv; |
46900298 | 669 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
46900298 | 670 | printk(KERN_DEBUG " sta_find_ibss: selected %pM current " |
0c1ad2ca | 671 | "%pM\n", cbss->bssid, ifibss->bssid); |
46900298 JB |
672 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
673 | ||
46900298 JB |
674 | printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM" |
675 | " based on configured SSID\n", | |
0c1ad2ca | 676 | sdata->name, cbss->bssid); |
46900298 | 677 | |
af8cdcd8 | 678 | ieee80211_sta_join_ibss(sdata, bss); |
46900298 | 679 | ieee80211_rx_bss_put(local, bss); |
af8cdcd8 | 680 | return; |
d419b9f0 | 681 | } |
46900298 JB |
682 | |
683 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
684 | printk(KERN_DEBUG " did not try to join ibss\n"); | |
685 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ | |
686 | ||
687 | /* Selected IBSS not found in current scan results - try to scan */ | |
ce9058ae | 688 | if (time_after(jiffies, ifibss->last_scan_completed + |
46900298 JB |
689 | IEEE80211_SCAN_INTERVAL)) { |
690 | printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to " | |
47846c9b | 691 | "join\n", sdata->name); |
46900298 | 692 | |
be4a4b6a JB |
693 | ieee80211_request_internal_scan(sdata, |
694 | ifibss->ssid, ifibss->ssid_len, | |
695 | ifibss->fixed_channel ? ifibss->channel : NULL); | |
ce9058ae | 696 | } else { |
46900298 JB |
697 | int interval = IEEE80211_SCAN_INTERVAL; |
698 | ||
699 | if (time_after(jiffies, ifibss->ibss_join_req + | |
700 | IEEE80211_IBSS_JOIN_TIMEOUT)) { | |
af8cdcd8 JB |
701 | if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) { |
702 | ieee80211_sta_create_ibss(sdata); | |
703 | return; | |
704 | } | |
46900298 | 705 | printk(KERN_DEBUG "%s: IBSS not allowed on" |
47846c9b | 706 | " %d MHz\n", sdata->name, |
46900298 JB |
707 | local->hw.conf.channel->center_freq); |
708 | ||
709 | /* No IBSS found - decrease scan interval and continue | |
710 | * scanning. */ | |
711 | interval = IEEE80211_SCAN_INTERVAL_SLOW; | |
712 | } | |
713 | ||
af8cdcd8 JB |
714 | mod_timer(&ifibss->timer, |
715 | round_jiffies(jiffies + interval)); | |
46900298 | 716 | } |
46900298 JB |
717 | } |
718 | ||
719 | static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, | |
c269a203 | 720 | struct sk_buff *req) |
46900298 | 721 | { |
c269a203 | 722 | struct ieee80211_mgmt *mgmt = (void *)req->data; |
46900298 JB |
723 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
724 | struct ieee80211_local *local = sdata->local; | |
c269a203 | 725 | int tx_last_beacon, len = req->len; |
46900298 JB |
726 | struct sk_buff *skb; |
727 | struct ieee80211_mgmt *resp; | |
40b275b6 | 728 | struct sk_buff *presp; |
46900298 JB |
729 | u8 *pos, *end; |
730 | ||
7a17a33c JB |
731 | lockdep_assert_held(&ifibss->mtx); |
732 | ||
40b275b6 JB |
733 | presp = rcu_dereference_protected(ifibss->presp, |
734 | lockdep_is_held(&ifibss->mtx)); | |
735 | ||
46900298 | 736 | if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || |
40b275b6 | 737 | len < 24 + 2 || !presp) |
46900298 JB |
738 | return; |
739 | ||
24487981 | 740 | tx_last_beacon = drv_tx_last_beacon(local); |
46900298 JB |
741 | |
742 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
743 | printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM" | |
744 | " (tx_last_beacon=%d)\n", | |
47846c9b | 745 | sdata->name, mgmt->sa, mgmt->da, |
46900298 JB |
746 | mgmt->bssid, tx_last_beacon); |
747 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ | |
748 | ||
1ed76487 | 749 | if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) |
46900298 JB |
750 | return; |
751 | ||
752 | if (memcmp(mgmt->bssid, ifibss->bssid, ETH_ALEN) != 0 && | |
753 | memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0) | |
754 | return; | |
755 | ||
756 | end = ((u8 *) mgmt) + len; | |
757 | pos = mgmt->u.probe_req.variable; | |
758 | if (pos[0] != WLAN_EID_SSID || | |
759 | pos + 2 + pos[1] > end) { | |
760 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
761 | printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq " | |
762 | "from %pM\n", | |
47846c9b | 763 | sdata->name, mgmt->sa); |
46900298 JB |
764 | #endif |
765 | return; | |
766 | } | |
767 | if (pos[1] != 0 && | |
768 | (pos[1] != ifibss->ssid_len || | |
0da780c2 | 769 | memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { |
46900298 JB |
770 | /* Ignore ProbeReq for foreign SSID */ |
771 | return; | |
772 | } | |
773 | ||
774 | /* Reply with ProbeResp */ | |
40b275b6 | 775 | skb = skb_copy(presp, GFP_KERNEL); |
46900298 JB |
776 | if (!skb) |
777 | return; | |
778 | ||
779 | resp = (struct ieee80211_mgmt *) skb->data; | |
780 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
781 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
782 | printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n", | |
47846c9b | 783 | sdata->name, resp->da); |
46900298 | 784 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
62ae67be JB |
785 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
786 | ieee80211_tx_skb(sdata, skb); | |
46900298 JB |
787 | } |
788 | ||
789 | static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, | |
790 | struct ieee80211_mgmt *mgmt, | |
791 | size_t len, | |
792 | struct ieee80211_rx_status *rx_status) | |
793 | { | |
794 | size_t baselen; | |
795 | struct ieee802_11_elems elems; | |
796 | ||
47846c9b | 797 | if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN)) |
46900298 JB |
798 | return; /* ignore ProbeResp to foreign address */ |
799 | ||
800 | baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; | |
801 | if (baselen > len) | |
802 | return; | |
803 | ||
804 | ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, | |
805 | &elems); | |
806 | ||
807 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); | |
808 | } | |
809 | ||
810 | static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, | |
811 | struct ieee80211_mgmt *mgmt, | |
812 | size_t len, | |
813 | struct ieee80211_rx_status *rx_status) | |
814 | { | |
815 | size_t baselen; | |
816 | struct ieee802_11_elems elems; | |
817 | ||
818 | /* Process beacon from the current BSS */ | |
819 | baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; | |
820 | if (baselen > len) | |
821 | return; | |
822 | ||
823 | ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems); | |
824 | ||
825 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true); | |
826 | } | |
827 | ||
1fa57d01 JB |
828 | void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, |
829 | struct sk_buff *skb) | |
46900298 JB |
830 | { |
831 | struct ieee80211_rx_status *rx_status; | |
832 | struct ieee80211_mgmt *mgmt; | |
833 | u16 fc; | |
834 | ||
f1d58c25 | 835 | rx_status = IEEE80211_SKB_RXCB(skb); |
46900298 JB |
836 | mgmt = (struct ieee80211_mgmt *) skb->data; |
837 | fc = le16_to_cpu(mgmt->frame_control); | |
838 | ||
7a17a33c JB |
839 | mutex_lock(&sdata->u.ibss.mtx); |
840 | ||
c926d006 TH |
841 | if (!sdata->u.ibss.ssid_len) |
842 | goto mgmt_out; /* not ready to merge yet */ | |
843 | ||
46900298 JB |
844 | switch (fc & IEEE80211_FCTL_STYPE) { |
845 | case IEEE80211_STYPE_PROBE_REQ: | |
c269a203 | 846 | ieee80211_rx_mgmt_probe_req(sdata, skb); |
46900298 JB |
847 | break; |
848 | case IEEE80211_STYPE_PROBE_RESP: | |
849 | ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, | |
850 | rx_status); | |
851 | break; | |
852 | case IEEE80211_STYPE_BEACON: | |
853 | ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, | |
854 | rx_status); | |
855 | break; | |
856 | case IEEE80211_STYPE_AUTH: | |
857 | ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); | |
858 | break; | |
859 | } | |
7a17a33c | 860 | |
c926d006 | 861 | mgmt_out: |
7a17a33c | 862 | mutex_unlock(&sdata->u.ibss.mtx); |
46900298 JB |
863 | } |
864 | ||
1fa57d01 | 865 | void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) |
46900298 | 866 | { |
1fa57d01 | 867 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
46900298 | 868 | |
7a17a33c JB |
869 | mutex_lock(&ifibss->mtx); |
870 | ||
871 | /* | |
872 | * Work could be scheduled after scan or similar | |
873 | * when we aren't even joined (or trying) with a | |
874 | * network. | |
875 | */ | |
876 | if (!ifibss->ssid_len) | |
877 | goto out; | |
46900298 JB |
878 | |
879 | switch (ifibss->state) { | |
880 | case IEEE80211_IBSS_MLME_SEARCH: | |
881 | ieee80211_sta_find_ibss(sdata); | |
882 | break; | |
883 | case IEEE80211_IBSS_MLME_JOINED: | |
884 | ieee80211_sta_merge_ibss(sdata); | |
885 | break; | |
886 | default: | |
887 | WARN_ON(1); | |
888 | break; | |
889 | } | |
46900298 | 890 | |
7a17a33c JB |
891 | out: |
892 | mutex_unlock(&ifibss->mtx); | |
3a4d4aa2 JB |
893 | } |
894 | ||
46900298 JB |
895 | static void ieee80211_ibss_timer(unsigned long data) |
896 | { | |
897 | struct ieee80211_sub_if_data *sdata = | |
898 | (struct ieee80211_sub_if_data *) data; | |
899 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
900 | struct ieee80211_local *local = sdata->local; | |
901 | ||
5bb644a0 JB |
902 | if (local->quiescing) { |
903 | ifibss->timer_running = true; | |
904 | return; | |
905 | } | |
906 | ||
7a17a33c | 907 | ieee80211_queue_work(&local->hw, &sdata->work); |
46900298 JB |
908 | } |
909 | ||
5bb644a0 JB |
910 | #ifdef CONFIG_PM |
911 | void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata) | |
912 | { | |
913 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
914 | ||
5bb644a0 JB |
915 | if (del_timer_sync(&ifibss->timer)) |
916 | ifibss->timer_running = true; | |
917 | } | |
918 | ||
919 | void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata) | |
920 | { | |
921 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
922 | ||
923 | if (ifibss->timer_running) { | |
924 | add_timer(&ifibss->timer); | |
925 | ifibss->timer_running = false; | |
926 | } | |
927 | } | |
928 | #endif | |
929 | ||
46900298 JB |
930 | void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) |
931 | { | |
932 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
933 | ||
46900298 JB |
934 | setup_timer(&ifibss->timer, ieee80211_ibss_timer, |
935 | (unsigned long) sdata); | |
7a17a33c | 936 | mutex_init(&ifibss->mtx); |
46900298 JB |
937 | } |
938 | ||
939 | /* scan finished notification */ | |
940 | void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) | |
941 | { | |
af8cdcd8 | 942 | struct ieee80211_sub_if_data *sdata; |
46900298 | 943 | |
29b4a4f7 JB |
944 | mutex_lock(&local->iflist_mtx); |
945 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 946 | if (!ieee80211_sdata_running(sdata)) |
0e41f715 | 947 | continue; |
af8cdcd8 JB |
948 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
949 | continue; | |
950 | sdata->u.ibss.last_scan_completed = jiffies; | |
7a17a33c | 951 | ieee80211_queue_work(&local->hw, &sdata->work); |
46900298 | 952 | } |
29b4a4f7 | 953 | mutex_unlock(&local->iflist_mtx); |
46900298 JB |
954 | } |
955 | ||
af8cdcd8 JB |
956 | int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, |
957 | struct cfg80211_ibss_params *params) | |
958 | { | |
959 | struct sk_buff *skb; | |
ff3cc5f4 | 960 | u32 changed = 0; |
af8cdcd8 | 961 | |
7a17a33c | 962 | skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + |
13c40c54 AS |
963 | sizeof(struct ieee80211_hdr_3addr) + |
964 | 12 /* struct ieee80211_mgmt.u.beacon */ + | |
965 | 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ + | |
966 | 2 + 8 /* max Supported Rates */ + | |
967 | 3 /* max DS params */ + | |
968 | 4 /* IBSS params */ + | |
969 | 2 + (IEEE80211_MAX_SUPP_RATES - 8) + | |
970 | 2 + sizeof(struct ieee80211_ht_cap) + | |
971 | 2 + sizeof(struct ieee80211_ht_info) + | |
7a17a33c JB |
972 | params->ie_len); |
973 | if (!skb) | |
974 | return -ENOMEM; | |
975 | ||
976 | mutex_lock(&sdata->u.ibss.mtx); | |
977 | ||
af8cdcd8 JB |
978 | if (params->bssid) { |
979 | memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); | |
980 | sdata->u.ibss.fixed_bssid = true; | |
981 | } else | |
982 | sdata->u.ibss.fixed_bssid = false; | |
983 | ||
fffd0934 | 984 | sdata->u.ibss.privacy = params->privacy; |
fbd2c8dc | 985 | sdata->u.ibss.basic_rates = params->basic_rates; |
dd5b4cc7 FF |
986 | memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, |
987 | sizeof(params->mcast_rate)); | |
fffd0934 | 988 | |
57c4d7b4 JB |
989 | sdata->vif.bss_conf.beacon_int = params->beacon_interval; |
990 | ||
af8cdcd8 | 991 | sdata->u.ibss.channel = params->channel; |
13c40c54 | 992 | sdata->u.ibss.channel_type = params->channel_type; |
af8cdcd8 JB |
993 | sdata->u.ibss.fixed_channel = params->channel_fixed; |
994 | ||
adfba3c7 JB |
995 | /* fix ourselves to that channel now already */ |
996 | if (params->channel_fixed) { | |
997 | sdata->local->oper_channel = params->channel; | |
13c40c54 | 998 | if (!ieee80211_set_channel_type(sdata->local, sdata, |
fb03c5eb DC |
999 | params->channel_type)) { |
1000 | mutex_unlock(&sdata->u.ibss.mtx); | |
cb71b8d8 | 1001 | kfree_skb(skb); |
13c40c54 | 1002 | return -EINVAL; |
fb03c5eb | 1003 | } |
adfba3c7 JB |
1004 | } |
1005 | ||
af8cdcd8 JB |
1006 | if (params->ie) { |
1007 | sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, | |
1008 | GFP_KERNEL); | |
1009 | if (sdata->u.ibss.ie) | |
1010 | sdata->u.ibss.ie_len = params->ie_len; | |
1011 | } | |
1012 | ||
af8cdcd8 JB |
1013 | sdata->u.ibss.skb = skb; |
1014 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; | |
1015 | sdata->u.ibss.ibss_join_req = jiffies; | |
1016 | ||
0e41f715 | 1017 | memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN); |
0e41f715 JB |
1018 | sdata->u.ibss.ssid_len = params->ssid_len; |
1019 | ||
7da7cc1d JB |
1020 | mutex_unlock(&sdata->u.ibss.mtx); |
1021 | ||
1022 | mutex_lock(&sdata->local->mtx); | |
5cff20e6 | 1023 | ieee80211_recalc_idle(sdata->local); |
7da7cc1d | 1024 | mutex_unlock(&sdata->local->mtx); |
5cff20e6 | 1025 | |
ff3cc5f4 SW |
1026 | /* |
1027 | * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is | |
1028 | * reserved, but an HT STA shall protect HT transmissions as though | |
1029 | * the HT Protection field were set to non-HT mixed mode. | |
1030 | * | |
1031 | * In an IBSS, the RIFS Mode field of the HT Operation element is | |
1032 | * also reserved, but an HT STA shall operate as though this field | |
1033 | * were set to 1. | |
1034 | */ | |
1035 | ||
1036 | sdata->vif.bss_conf.ht_operation_mode |= | |
1037 | IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | |
1038 | | IEEE80211_HT_PARAM_RIFS_MODE; | |
1039 | ||
1040 | changed |= BSS_CHANGED_HT; | |
1041 | ieee80211_bss_info_change_notify(sdata, changed); | |
1042 | ||
64592c8f | 1043 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
af8cdcd8 JB |
1044 | |
1045 | return 0; | |
1046 | } | |
1047 | ||
1048 | int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) | |
1049 | { | |
1050 | struct sk_buff *skb; | |
5ea096c0 TP |
1051 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
1052 | struct ieee80211_local *local = sdata->local; | |
1053 | struct cfg80211_bss *cbss; | |
1054 | u16 capability; | |
7a17a33c JB |
1055 | int active_ibss; |
1056 | ||
1057 | mutex_lock(&sdata->u.ibss.mtx); | |
5ea096c0 | 1058 | |
f3209bea JB |
1059 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; |
1060 | memset(sdata->u.ibss.bssid, 0, ETH_ALEN); | |
1061 | sdata->u.ibss.ssid_len = 0; | |
1062 | ||
5ea096c0 TP |
1063 | active_ibss = ieee80211_sta_active_ibss(sdata); |
1064 | ||
1065 | if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) { | |
1066 | capability = WLAN_CAPABILITY_IBSS; | |
1067 | ||
1068 | if (ifibss->privacy) | |
1069 | capability |= WLAN_CAPABILITY_PRIVACY; | |
1070 | ||
1071 | cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->channel, | |
1072 | ifibss->bssid, ifibss->ssid, | |
1073 | ifibss->ssid_len, WLAN_CAPABILITY_IBSS | | |
1074 | WLAN_CAPABILITY_PRIVACY, | |
1075 | capability); | |
1076 | ||
1077 | if (cbss) { | |
1078 | cfg80211_unlink_bss(local->hw.wiphy, cbss); | |
1079 | cfg80211_put_bss(cbss); | |
1080 | } | |
1081 | } | |
af8cdcd8 | 1082 | |
af8cdcd8 | 1083 | sta_info_flush(sdata->local, sdata); |
86a2ea41 | 1084 | netif_carrier_off(sdata->dev); |
af8cdcd8 JB |
1085 | |
1086 | /* remove beacon */ | |
1087 | kfree(sdata->u.ibss.ie); | |
40b275b6 JB |
1088 | skb = rcu_dereference_protected(sdata->u.ibss.presp, |
1089 | lockdep_is_held(&sdata->u.ibss.mtx)); | |
a9b3cd7f | 1090 | RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); |
8fc214ba JB |
1091 | sdata->vif.bss_conf.ibss_joined = false; |
1092 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | | |
1093 | BSS_CHANGED_IBSS); | |
af8cdcd8 JB |
1094 | synchronize_rcu(); |
1095 | kfree_skb(skb); | |
1096 | ||
35f20c14 | 1097 | skb_queue_purge(&sdata->skb_queue); |
5cff20e6 | 1098 | |
bc05d19f | 1099 | del_timer_sync(&sdata->u.ibss.timer); |
7a17a33c JB |
1100 | |
1101 | mutex_unlock(&sdata->u.ibss.mtx); | |
bc05d19f | 1102 | |
7da7cc1d | 1103 | mutex_lock(&local->mtx); |
5cff20e6 | 1104 | ieee80211_recalc_idle(sdata->local); |
7da7cc1d | 1105 | mutex_unlock(&local->mtx); |
af8cdcd8 JB |
1106 | |
1107 | return 0; | |
1108 | } |