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) | |
34 | #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ) | |
35 | ||
36 | #define IEEE80211_IBSS_MAX_STA_ENTRIES 128 | |
37 | ||
38 | ||
af8cdcd8 JB |
39 | static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
40 | const u8 *bssid, const int beacon_int, | |
41 | struct ieee80211_channel *chan, | |
b59066a2 | 42 | const u32 basic_rates, |
af8cdcd8 | 43 | const u16 capability, u64 tsf) |
46900298 JB |
44 | { |
45 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
46 | struct ieee80211_local *local = sdata->local; | |
b59066a2 | 47 | int rates, i; |
46900298 JB |
48 | struct sk_buff *skb; |
49 | struct ieee80211_mgmt *mgmt; | |
50 | u8 *pos; | |
51 | struct ieee80211_supported_band *sband; | |
f446d10f | 52 | struct cfg80211_bss *bss; |
57c4d7b4 | 53 | u32 bss_change; |
b59066a2 | 54 | u8 supp_rates[IEEE80211_MAX_SUPP_RATES]; |
13c40c54 | 55 | enum nl80211_channel_type channel_type; |
24487981 | 56 | |
7a17a33c JB |
57 | lockdep_assert_held(&ifibss->mtx); |
58 | ||
24487981 | 59 | /* Reset own TSF to allow time synchronization work. */ |
37a41b4a | 60 | drv_reset_tsf(local, sdata); |
46900298 | 61 | |
af8cdcd8 | 62 | skb = ifibss->skb; |
a9b3cd7f | 63 | RCU_INIT_POINTER(ifibss->presp, NULL); |
af8cdcd8 JB |
64 | synchronize_rcu(); |
65 | skb->data = skb->head; | |
66 | skb->len = 0; | |
67 | skb_reset_tail_pointer(skb); | |
68 | skb_reserve(skb, sdata->local->hw.extra_tx_headroom); | |
46900298 | 69 | |
af8cdcd8 JB |
70 | if (memcmp(ifibss->bssid, bssid, ETH_ALEN)) |
71 | sta_info_flush(sdata->local, sdata); | |
46900298 | 72 | |
49b5c7f4 JB |
73 | /* if merging, indicate to driver that we leave the old IBSS */ |
74 | if (sdata->vif.bss_conf.ibss_joined) { | |
75 | sdata->vif.bss_conf.ibss_joined = false; | |
86a2ea41 | 76 | netif_carrier_off(sdata->dev); |
49b5c7f4 JB |
77 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IBSS); |
78 | } | |
79 | ||
46900298 | 80 | memcpy(ifibss->bssid, bssid, ETH_ALEN); |
46900298 | 81 | |
af8cdcd8 | 82 | sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0; |
46900298 | 83 | |
13c40c54 AS |
84 | channel_type = ifibss->channel_type; |
85 | if (channel_type > NL80211_CHAN_HT20 && | |
86 | !cfg80211_can_beacon_sec_chan(local->hw.wiphy, chan, channel_type)) | |
87 | channel_type = NL80211_CHAN_HT20; | |
88 | if (!ieee80211_set_channel_type(local, sdata, channel_type)) { | |
89 | /* can only fail due to HT40+/- mismatch */ | |
90 | channel_type = NL80211_CHAN_HT20; | |
91 | WARN_ON(!ieee80211_set_channel_type(local, sdata, | |
92 | NL80211_CHAN_HT20)); | |
93 | } | |
af8cdcd8 | 94 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); |
57c4d7b4 | 95 | |
af8cdcd8 | 96 | sband = local->hw.wiphy->bands[chan->band]; |
46900298 | 97 | |
b59066a2 JB |
98 | /* build supported rates array */ |
99 | pos = supp_rates; | |
100 | for (i = 0; i < sband->n_bitrates; i++) { | |
101 | int rate = sband->bitrates[i].bitrate; | |
102 | u8 basic = 0; | |
103 | if (basic_rates & BIT(i)) | |
104 | basic = 0x80; | |
105 | *pos++ = basic | (u8) (rate / 5); | |
106 | } | |
107 | ||
46900298 | 108 | /* Build IBSS probe response */ |
af8cdcd8 | 109 | mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon)); |
46900298 JB |
110 | memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon)); |
111 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | | |
112 | IEEE80211_STYPE_PROBE_RESP); | |
113 | memset(mgmt->da, 0xff, ETH_ALEN); | |
47846c9b | 114 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
46900298 | 115 | memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN); |
57c4d7b4 | 116 | mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int); |
707c1b4e | 117 | mgmt->u.beacon.timestamp = cpu_to_le64(tsf); |
46900298 JB |
118 | mgmt->u.beacon.capab_info = cpu_to_le16(capability); |
119 | ||
120 | pos = skb_put(skb, 2 + ifibss->ssid_len); | |
121 | *pos++ = WLAN_EID_SSID; | |
122 | *pos++ = ifibss->ssid_len; | |
123 | memcpy(pos, ifibss->ssid, ifibss->ssid_len); | |
124 | ||
b59066a2 | 125 | rates = sband->n_bitrates; |
46900298 JB |
126 | if (rates > 8) |
127 | rates = 8; | |
128 | pos = skb_put(skb, 2 + rates); | |
129 | *pos++ = WLAN_EID_SUPP_RATES; | |
130 | *pos++ = rates; | |
131 | memcpy(pos, supp_rates, rates); | |
132 | ||
133 | if (sband->band == IEEE80211_BAND_2GHZ) { | |
134 | pos = skb_put(skb, 2 + 1); | |
135 | *pos++ = WLAN_EID_DS_PARAMS; | |
136 | *pos++ = 1; | |
af8cdcd8 | 137 | *pos++ = ieee80211_frequency_to_channel(chan->center_freq); |
46900298 JB |
138 | } |
139 | ||
140 | pos = skb_put(skb, 2 + 2); | |
141 | *pos++ = WLAN_EID_IBSS_PARAMS; | |
142 | *pos++ = 2; | |
143 | /* FIX: set ATIM window based on scan results */ | |
144 | *pos++ = 0; | |
145 | *pos++ = 0; | |
146 | ||
b59066a2 JB |
147 | if (sband->n_bitrates > 8) { |
148 | rates = sband->n_bitrates - 8; | |
46900298 JB |
149 | pos = skb_put(skb, 2 + rates); |
150 | *pos++ = WLAN_EID_EXT_SUPP_RATES; | |
151 | *pos++ = rates; | |
152 | memcpy(pos, &supp_rates[8], rates); | |
153 | } | |
154 | ||
af8cdcd8 JB |
155 | if (ifibss->ie_len) |
156 | memcpy(skb_put(skb, ifibss->ie_len), | |
157 | ifibss->ie, ifibss->ie_len); | |
158 | ||
13c40c54 AS |
159 | /* add HT capability and information IEs */ |
160 | if (channel_type && sband->ht_cap.ht_supported) { | |
161 | pos = skb_put(skb, 4 + | |
162 | sizeof(struct ieee80211_ht_cap) + | |
163 | sizeof(struct ieee80211_ht_info)); | |
164 | pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, | |
165 | sband->ht_cap.cap); | |
166 | pos = ieee80211_ie_build_ht_info(pos, | |
167 | &sband->ht_cap, | |
168 | chan, | |
169 | channel_type); | |
170 | } | |
171 | ||
9eba6125 BR |
172 | if (local->hw.queues >= 4) { |
173 | pos = skb_put(skb, 9); | |
174 | *pos++ = WLAN_EID_VENDOR_SPECIFIC; | |
175 | *pos++ = 7; /* len */ | |
176 | *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */ | |
177 | *pos++ = 0x50; | |
178 | *pos++ = 0xf2; | |
179 | *pos++ = 2; /* WME */ | |
180 | *pos++ = 0; /* WME info */ | |
181 | *pos++ = 1; /* WME ver */ | |
182 | *pos++ = 0; /* U-APSD no in use */ | |
183 | } | |
184 | ||
cf778b00 | 185 | rcu_assign_pointer(ifibss->presp, skb); |
46900298 | 186 | |
2d0ddec5 | 187 | sdata->vif.bss_conf.beacon_int = beacon_int; |
fbd2c8dc | 188 | sdata->vif.bss_conf.basic_rates = basic_rates; |
2d0ddec5 JB |
189 | bss_change = BSS_CHANGED_BEACON_INT; |
190 | bss_change |= ieee80211_reset_erp_info(sdata); | |
191 | bss_change |= BSS_CHANGED_BSSID; | |
192 | bss_change |= BSS_CHANGED_BEACON; | |
193 | bss_change |= BSS_CHANGED_BEACON_ENABLED; | |
392cfdb1 | 194 | bss_change |= BSS_CHANGED_BASIC_RATES; |
13c40c54 | 195 | bss_change |= BSS_CHANGED_HT; |
8fc214ba JB |
196 | bss_change |= BSS_CHANGED_IBSS; |
197 | sdata->vif.bss_conf.ibss_joined = true; | |
2d0ddec5 | 198 | ieee80211_bss_info_change_notify(sdata, bss_change); |
46900298 | 199 | |
b59066a2 | 200 | ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates); |
46900298 | 201 | |
46900298 | 202 | ifibss->state = IEEE80211_IBSS_MLME_JOINED; |
af8cdcd8 JB |
203 | mod_timer(&ifibss->timer, |
204 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 | 205 | |
f446d10f JB |
206 | bss = cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel, |
207 | mgmt, skb->len, 0, GFP_KERNEL); | |
208 | cfg80211_put_bss(bss); | |
86a2ea41 | 209 | netif_carrier_on(sdata->dev); |
af8cdcd8 | 210 | cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL); |
46900298 JB |
211 | } |
212 | ||
af8cdcd8 JB |
213 | static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
214 | struct ieee80211_bss *bss) | |
46900298 | 215 | { |
0c1ad2ca JB |
216 | struct cfg80211_bss *cbss = |
217 | container_of((void *)bss, struct cfg80211_bss, priv); | |
b59066a2 JB |
218 | struct ieee80211_supported_band *sband; |
219 | u32 basic_rates; | |
220 | int i, j; | |
0c1ad2ca | 221 | u16 beacon_int = cbss->beacon_interval; |
57c4d7b4 | 222 | |
7a17a33c JB |
223 | lockdep_assert_held(&sdata->u.ibss.mtx); |
224 | ||
57c4d7b4 JB |
225 | if (beacon_int < 10) |
226 | beacon_int = 10; | |
227 | ||
0c1ad2ca | 228 | sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; |
b59066a2 JB |
229 | |
230 | basic_rates = 0; | |
231 | ||
232 | for (i = 0; i < bss->supp_rates_len; i++) { | |
233 | int rate = (bss->supp_rates[i] & 0x7f) * 5; | |
234 | bool is_basic = !!(bss->supp_rates[i] & 0x80); | |
235 | ||
236 | for (j = 0; j < sband->n_bitrates; j++) { | |
237 | if (sband->bitrates[j].bitrate == rate) { | |
238 | if (is_basic) | |
239 | basic_rates |= BIT(j); | |
240 | break; | |
241 | } | |
242 | } | |
243 | } | |
244 | ||
0c1ad2ca | 245 | __ieee80211_sta_join_ibss(sdata, cbss->bssid, |
57c4d7b4 | 246 | beacon_int, |
0c1ad2ca | 247 | cbss->channel, |
b59066a2 | 248 | basic_rates, |
0c1ad2ca JB |
249 | cbss->capability, |
250 | cbss->tsf); | |
46900298 JB |
251 | } |
252 | ||
6d810f10 AQ |
253 | static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta, |
254 | bool auth) | |
8bf11d8d JB |
255 | __acquires(RCU) |
256 | { | |
257 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
258 | u8 addr[ETH_ALEN]; | |
259 | ||
260 | memcpy(addr, sta->sta.addr, ETH_ALEN); | |
261 | ||
262 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
263 | wiphy_debug(sdata->local->hw.wiphy, | |
264 | "Adding new IBSS station %pM (dev=%s)\n", | |
265 | addr, sdata->name); | |
266 | #endif | |
267 | ||
268 | sta_info_move_state(sta, IEEE80211_STA_AUTH); | |
269 | sta_info_move_state(sta, IEEE80211_STA_ASSOC); | |
270 | sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED); | |
271 | ||
272 | rate_control_rate_init(sta); | |
273 | ||
274 | /* If it fails, maybe we raced another insertion? */ | |
275 | if (sta_info_insert_rcu(sta)) | |
276 | return sta_info_get(sdata, addr); | |
6d810f10 | 277 | if (auth) { |
24dd0dd7 | 278 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
6d810f10 AQ |
279 | printk(KERN_DEBUG "TX Auth SA=%pM DA=%pM BSSID=%pM" |
280 | "(auth_transaction=1)\n", sdata->vif.addr, | |
281 | sdata->u.ibss.bssid, addr); | |
24dd0dd7 | 282 | #endif |
6d810f10 AQ |
283 | ieee80211_send_auth(sdata, 1, WLAN_AUTH_OPEN, NULL, 0, |
284 | addr, sdata->u.ibss.bssid, NULL, 0, 0); | |
285 | } | |
8bf11d8d JB |
286 | return sta; |
287 | } | |
288 | ||
289 | static struct sta_info * | |
290 | ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, | |
291 | const u8 *bssid, const u8 *addr, | |
6d810f10 | 292 | u32 supp_rates, bool auth) |
8bf11d8d JB |
293 | __acquires(RCU) |
294 | { | |
295 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
296 | struct ieee80211_local *local = sdata->local; | |
297 | struct sta_info *sta; | |
298 | int band = local->hw.conf.channel->band; | |
299 | ||
300 | /* | |
301 | * XXX: Consider removing the least recently used entry and | |
302 | * allow new one to be added. | |
303 | */ | |
304 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { | |
305 | if (net_ratelimit()) | |
306 | printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n", | |
307 | sdata->name, addr); | |
308 | rcu_read_lock(); | |
309 | return NULL; | |
310 | } | |
311 | ||
312 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { | |
313 | rcu_read_lock(); | |
314 | return NULL; | |
315 | } | |
316 | ||
317 | if (compare_ether_addr(bssid, sdata->u.ibss.bssid)) { | |
318 | rcu_read_lock(); | |
319 | return NULL; | |
320 | } | |
321 | ||
322 | sta = sta_info_alloc(sdata, addr, GFP_KERNEL); | |
323 | if (!sta) { | |
324 | rcu_read_lock(); | |
325 | return NULL; | |
326 | } | |
327 | ||
328 | sta->last_rx = jiffies; | |
329 | ||
330 | /* make sure mandatory rates are always added */ | |
331 | sta->sta.supp_rates[band] = supp_rates | | |
332 | ieee80211_mandatory_rates(local, band); | |
333 | ||
6d810f10 AQ |
334 | return ieee80211_ibss_finish_sta(sta, auth); |
335 | } | |
336 | ||
337 | static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, | |
338 | struct ieee80211_mgmt *mgmt, | |
339 | size_t len) | |
340 | { | |
341 | u16 auth_alg, auth_transaction; | |
342 | ||
343 | lockdep_assert_held(&sdata->u.ibss.mtx); | |
344 | ||
345 | if (len < 24 + 6) | |
346 | return; | |
347 | ||
348 | auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); | |
349 | auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); | |
350 | ||
351 | if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) | |
352 | return; | |
353 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
354 | printk(KERN_DEBUG "%s: RX Auth SA=%pM DA=%pM BSSID=%pM." | |
355 | "(auth_transaction=%d)\n", | |
356 | sdata->name, mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction); | |
357 | #endif | |
358 | sta_info_destroy_addr(sdata, mgmt->sa); | |
359 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 0, false); | |
360 | rcu_read_unlock(); | |
361 | ||
362 | /* | |
363 | * IEEE 802.11 standard does not require authentication in IBSS | |
364 | * networks and most implementations do not seem to use it. | |
365 | * However, try to reply to authentication attempts if someone | |
366 | * has actually implemented this. | |
367 | */ | |
368 | ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, NULL, 0, | |
369 | mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0); | |
8bf11d8d JB |
370 | } |
371 | ||
46900298 JB |
372 | static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, |
373 | struct ieee80211_mgmt *mgmt, | |
374 | size_t len, | |
375 | struct ieee80211_rx_status *rx_status, | |
376 | struct ieee802_11_elems *elems, | |
377 | bool beacon) | |
378 | { | |
379 | struct ieee80211_local *local = sdata->local; | |
380 | int freq; | |
0c1ad2ca | 381 | struct cfg80211_bss *cbss; |
46900298 JB |
382 | struct ieee80211_bss *bss; |
383 | struct sta_info *sta; | |
384 | struct ieee80211_channel *channel; | |
385 | u64 beacon_timestamp, rx_timestamp; | |
386 | u32 supp_rates = 0; | |
387 | enum ieee80211_band band = rx_status->band; | |
13c40c54 AS |
388 | struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; |
389 | bool rates_updated = false; | |
46900298 JB |
390 | |
391 | if (elems->ds_params && elems->ds_params_len == 1) | |
59eb21a6 BR |
392 | freq = ieee80211_channel_to_frequency(elems->ds_params[0], |
393 | band); | |
46900298 JB |
394 | else |
395 | freq = rx_status->freq; | |
396 | ||
397 | channel = ieee80211_get_channel(local->hw.wiphy, freq); | |
398 | ||
399 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
400 | return; | |
401 | ||
9eba6125 | 402 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC && |
46900298 | 403 | memcmp(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) { |
46900298 JB |
404 | |
405 | rcu_read_lock(); | |
abe60632 | 406 | sta = sta_info_get(sdata, mgmt->sa); |
46900298 | 407 | |
9eba6125 BR |
408 | if (elems->supp_rates) { |
409 | supp_rates = ieee80211_sta_get_rates(local, elems, | |
410 | band); | |
411 | if (sta) { | |
412 | u32 prev_rates; | |
413 | ||
414 | prev_rates = sta->sta.supp_rates[band]; | |
415 | /* make sure mandatory rates are always added */ | |
416 | sta->sta.supp_rates[band] = supp_rates | | |
417 | ieee80211_mandatory_rates(local, band); | |
46900298 | 418 | |
9eba6125 | 419 | if (sta->sta.supp_rates[band] != prev_rates) { |
46900298 | 420 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
9eba6125 BR |
421 | printk(KERN_DEBUG |
422 | "%s: updated supp_rates set " | |
423 | "for %pM based on beacon" | |
424 | "/probe_resp (0x%x -> 0x%x)\n", | |
425 | sdata->name, sta->sta.addr, | |
426 | prev_rates, | |
427 | sta->sta.supp_rates[band]); | |
46900298 | 428 | #endif |
13c40c54 | 429 | rates_updated = true; |
9eba6125 | 430 | } |
8bf11d8d JB |
431 | } else { |
432 | rcu_read_unlock(); | |
9eba6125 | 433 | sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, |
6d810f10 | 434 | mgmt->sa, supp_rates, true); |
8bf11d8d | 435 | } |
34e89507 | 436 | } |
9eba6125 BR |
437 | |
438 | if (sta && elems->wmm_info) | |
c2c98fde | 439 | set_sta_flag(sta, WLAN_STA_WME); |
9eba6125 | 440 | |
13c40c54 AS |
441 | if (sta && elems->ht_info_elem && elems->ht_cap_elem && |
442 | sdata->u.ibss.channel_type != NL80211_CHAN_NO_HT) { | |
443 | /* we both use HT */ | |
444 | struct ieee80211_sta_ht_cap sta_ht_cap_new; | |
445 | enum nl80211_channel_type channel_type = | |
446 | ieee80211_ht_info_to_channel_type( | |
447 | elems->ht_info_elem); | |
448 | ||
449 | ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, | |
450 | elems->ht_cap_elem, | |
451 | &sta_ht_cap_new); | |
452 | ||
453 | /* | |
454 | * fall back to HT20 if we don't use or use | |
455 | * the other extension channel | |
456 | */ | |
457 | if ((channel_type == NL80211_CHAN_HT40MINUS || | |
458 | channel_type == NL80211_CHAN_HT40PLUS) && | |
459 | channel_type != sdata->u.ibss.channel_type) | |
460 | sta_ht_cap_new.cap &= | |
461 | ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; | |
462 | ||
463 | if (memcmp(&sta->sta.ht_cap, &sta_ht_cap_new, | |
464 | sizeof(sta_ht_cap_new))) { | |
465 | memcpy(&sta->sta.ht_cap, &sta_ht_cap_new, | |
466 | sizeof(sta_ht_cap_new)); | |
467 | rates_updated = true; | |
468 | } | |
469 | } | |
470 | ||
471 | if (sta && rates_updated) | |
472 | rate_control_rate_init(sta); | |
473 | ||
9eba6125 | 474 | rcu_read_unlock(); |
46900298 JB |
475 | } |
476 | ||
477 | bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, | |
478 | channel, beacon); | |
479 | if (!bss) | |
480 | return; | |
481 | ||
0c1ad2ca JB |
482 | cbss = container_of((void *)bss, struct cfg80211_bss, priv); |
483 | ||
46900298 | 484 | /* was just updated in ieee80211_bss_info_update */ |
0c1ad2ca | 485 | beacon_timestamp = cbss->tsf; |
46900298 JB |
486 | |
487 | /* check if we need to merge IBSS */ | |
488 | ||
46900298 | 489 | /* we use a fixed BSSID */ |
a98bfec2 | 490 | if (sdata->u.ibss.fixed_bssid) |
46900298 JB |
491 | goto put_bss; |
492 | ||
493 | /* not an IBSS */ | |
0c1ad2ca | 494 | if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) |
46900298 JB |
495 | goto put_bss; |
496 | ||
497 | /* different channel */ | |
0c1ad2ca | 498 | if (cbss->channel != local->oper_channel) |
46900298 JB |
499 | goto put_bss; |
500 | ||
501 | /* different SSID */ | |
502 | if (elems->ssid_len != sdata->u.ibss.ssid_len || | |
503 | memcmp(elems->ssid, sdata->u.ibss.ssid, | |
504 | sdata->u.ibss.ssid_len)) | |
505 | goto put_bss; | |
506 | ||
34e8f082 | 507 | /* same BSSID */ |
0c1ad2ca | 508 | if (memcmp(cbss->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) |
34e8f082 AF |
509 | goto put_bss; |
510 | ||
6ebacbb7 | 511 | if (rx_status->flag & RX_FLAG_MACTIME_MPDU) { |
46900298 JB |
512 | /* |
513 | * For correct IBSS merging we need mactime; since mactime is | |
514 | * defined as the time the first data symbol of the frame hits | |
515 | * the PHY, and the timestamp of the beacon is defined as "the | |
516 | * time that the data symbol containing the first bit of the | |
517 | * timestamp is transmitted to the PHY plus the transmitting | |
518 | * STA's delays through its local PHY from the MAC-PHY | |
519 | * interface to its interface with the WM" (802.11 11.1.2) | |
520 | * - equals the time this bit arrives at the receiver - we have | |
521 | * to take into account the offset between the two. | |
522 | * | |
523 | * E.g. at 1 MBit that means mactime is 192 usec earlier | |
524 | * (=24 bytes * 8 usecs/byte) than the beacon timestamp. | |
525 | */ | |
526 | int rate; | |
527 | ||
528 | if (rx_status->flag & RX_FLAG_HT) | |
529 | rate = 65; /* TODO: HT rates */ | |
530 | else | |
531 | rate = local->hw.wiphy->bands[band]-> | |
532 | bitrates[rx_status->rate_idx].bitrate; | |
533 | ||
534 | rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate); | |
24487981 JB |
535 | } else { |
536 | /* | |
537 | * second best option: get current TSF | |
538 | * (will return -1 if not supported) | |
539 | */ | |
37a41b4a | 540 | rx_timestamp = drv_get_tsf(local, sdata); |
24487981 | 541 | } |
46900298 JB |
542 | |
543 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
544 | printk(KERN_DEBUG "RX beacon SA=%pM BSSID=" | |
545 | "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", | |
546 | mgmt->sa, mgmt->bssid, | |
547 | (unsigned long long)rx_timestamp, | |
548 | (unsigned long long)beacon_timestamp, | |
549 | (unsigned long long)(rx_timestamp - beacon_timestamp), | |
550 | jiffies); | |
551 | #endif | |
552 | ||
553 | if (beacon_timestamp > rx_timestamp) { | |
554 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
555 | printk(KERN_DEBUG "%s: beacon TSF higher than " | |
556 | "local TSF - IBSS merge with BSSID %pM\n", | |
47846c9b | 557 | sdata->name, mgmt->bssid); |
46900298 JB |
558 | #endif |
559 | ieee80211_sta_join_ibss(sdata, bss); | |
09a08cff | 560 | supp_rates = ieee80211_sta_get_rates(local, elems, band); |
34e89507 | 561 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, |
6d810f10 | 562 | supp_rates, true); |
8bf11d8d | 563 | rcu_read_unlock(); |
46900298 JB |
564 | } |
565 | ||
566 | put_bss: | |
567 | ieee80211_rx_bss_put(local, bss); | |
568 | } | |
569 | ||
8bf11d8d JB |
570 | void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, |
571 | const u8 *bssid, const u8 *addr, | |
572 | u32 supp_rates) | |
46900298 | 573 | { |
2e10d330 | 574 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
46900298 JB |
575 | struct ieee80211_local *local = sdata->local; |
576 | struct sta_info *sta; | |
577 | int band = local->hw.conf.channel->band; | |
578 | ||
af8cdcd8 JB |
579 | /* |
580 | * XXX: Consider removing the least recently used entry and | |
581 | * allow new one to be added. | |
582 | */ | |
46900298 | 583 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { |
af8cdcd8 JB |
584 | if (net_ratelimit()) |
585 | printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n", | |
47846c9b | 586 | sdata->name, addr); |
8bf11d8d | 587 | return; |
46900298 JB |
588 | } |
589 | ||
2e10d330 | 590 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) |
8bf11d8d | 591 | return; |
2e10d330 | 592 | |
46900298 | 593 | if (compare_ether_addr(bssid, sdata->u.ibss.bssid)) |
8bf11d8d | 594 | return; |
46900298 | 595 | |
8bf11d8d | 596 | sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); |
46900298 | 597 | if (!sta) |
8bf11d8d | 598 | return; |
46900298 | 599 | |
c8716d9d | 600 | sta->last_rx = jiffies; |
d9a7ddb0 | 601 | |
46900298 JB |
602 | /* make sure mandatory rates are always added */ |
603 | sta->sta.supp_rates[band] = supp_rates | | |
604 | ieee80211_mandatory_rates(local, band); | |
605 | ||
8bf11d8d JB |
606 | spin_lock(&ifibss->incomplete_lock); |
607 | list_add(&sta->list, &ifibss->incomplete_stations); | |
608 | spin_unlock(&ifibss->incomplete_lock); | |
609 | ieee80211_queue_work(&local->hw, &sdata->work); | |
46900298 JB |
610 | } |
611 | ||
612 | static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) | |
613 | { | |
614 | struct ieee80211_local *local = sdata->local; | |
615 | int active = 0; | |
616 | struct sta_info *sta; | |
617 | ||
7a17a33c JB |
618 | lockdep_assert_held(&sdata->u.ibss.mtx); |
619 | ||
46900298 JB |
620 | rcu_read_lock(); |
621 | ||
622 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
623 | if (sta->sdata == sdata && | |
624 | time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL, | |
625 | jiffies)) { | |
626 | active++; | |
627 | break; | |
628 | } | |
629 | } | |
630 | ||
631 | rcu_read_unlock(); | |
632 | ||
633 | return active; | |
634 | } | |
635 | ||
ce9058ae BP |
636 | /* |
637 | * This function is called with state == IEEE80211_IBSS_MLME_JOINED | |
638 | */ | |
46900298 JB |
639 | |
640 | static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) | |
641 | { | |
642 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
643 | ||
7a17a33c JB |
644 | lockdep_assert_held(&ifibss->mtx); |
645 | ||
af8cdcd8 JB |
646 | mod_timer(&ifibss->timer, |
647 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 JB |
648 | |
649 | ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT); | |
af8cdcd8 | 650 | |
450aae3d S |
651 | if (time_before(jiffies, ifibss->last_scan_completed + |
652 | IEEE80211_IBSS_MERGE_INTERVAL)) | |
653 | return; | |
654 | ||
46900298 JB |
655 | if (ieee80211_sta_active_ibss(sdata)) |
656 | return; | |
657 | ||
f1e3be15 | 658 | if (ifibss->fixed_bssid) |
46900298 JB |
659 | return; |
660 | ||
661 | printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other " | |
47846c9b | 662 | "IBSS networks with same SSID (merge)\n", sdata->name); |
46900298 | 663 | |
be4a4b6a | 664 | ieee80211_request_internal_scan(sdata, |
f1e3be15 NC |
665 | ifibss->ssid, ifibss->ssid_len, |
666 | ifibss->fixed_channel ? ifibss->channel : NULL); | |
46900298 JB |
667 | } |
668 | ||
af8cdcd8 | 669 | static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
670 | { |
671 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
46900298 | 672 | u8 bssid[ETH_ALEN]; |
46900298 JB |
673 | u16 capability; |
674 | int i; | |
675 | ||
7a17a33c JB |
676 | lockdep_assert_held(&ifibss->mtx); |
677 | ||
af8cdcd8 | 678 | if (ifibss->fixed_bssid) { |
46900298 JB |
679 | memcpy(bssid, ifibss->bssid, ETH_ALEN); |
680 | } else { | |
681 | /* Generate random, not broadcast, locally administered BSSID. Mix in | |
682 | * own MAC address to make sure that devices that do not have proper | |
683 | * random number generator get different BSSID. */ | |
684 | get_random_bytes(bssid, ETH_ALEN); | |
685 | for (i = 0; i < ETH_ALEN; i++) | |
47846c9b | 686 | bssid[i] ^= sdata->vif.addr[i]; |
46900298 JB |
687 | bssid[0] &= ~0x01; |
688 | bssid[0] |= 0x02; | |
689 | } | |
690 | ||
691 | printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n", | |
47846c9b | 692 | sdata->name, bssid); |
46900298 | 693 | |
46900298 JB |
694 | capability = WLAN_CAPABILITY_IBSS; |
695 | ||
fffd0934 | 696 | if (ifibss->privacy) |
46900298 JB |
697 | capability |= WLAN_CAPABILITY_PRIVACY; |
698 | else | |
699 | sdata->drop_unencrypted = 0; | |
700 | ||
57c4d7b4 | 701 | __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, |
fbd2c8dc | 702 | ifibss->channel, ifibss->basic_rates, |
b59066a2 | 703 | capability, 0); |
46900298 JB |
704 | } |
705 | ||
ce9058ae BP |
706 | /* |
707 | * This function is called with state == IEEE80211_IBSS_MLME_SEARCH | |
708 | */ | |
709 | ||
af8cdcd8 | 710 | static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
711 | { |
712 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
713 | struct ieee80211_local *local = sdata->local; | |
0c1ad2ca | 714 | struct cfg80211_bss *cbss; |
af8cdcd8 | 715 | struct ieee80211_channel *chan = NULL; |
46900298 JB |
716 | const u8 *bssid = NULL; |
717 | int active_ibss; | |
e0d61887 | 718 | u16 capability; |
46900298 | 719 | |
7a17a33c JB |
720 | lockdep_assert_held(&ifibss->mtx); |
721 | ||
46900298 JB |
722 | active_ibss = ieee80211_sta_active_ibss(sdata); |
723 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
724 | printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n", | |
47846c9b | 725 | sdata->name, active_ibss); |
46900298 JB |
726 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
727 | ||
728 | if (active_ibss) | |
af8cdcd8 | 729 | return; |
46900298 | 730 | |
e0d61887 | 731 | capability = WLAN_CAPABILITY_IBSS; |
fffd0934 | 732 | if (ifibss->privacy) |
e0d61887 | 733 | capability |= WLAN_CAPABILITY_PRIVACY; |
af8cdcd8 JB |
734 | if (ifibss->fixed_bssid) |
735 | bssid = ifibss->bssid; | |
736 | if (ifibss->fixed_channel) | |
737 | chan = ifibss->channel; | |
738 | if (!is_zero_ether_addr(ifibss->bssid)) | |
46900298 | 739 | bssid = ifibss->bssid; |
0c1ad2ca JB |
740 | cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, |
741 | ifibss->ssid, ifibss->ssid_len, | |
742 | WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY, | |
743 | capability); | |
744 | ||
745 | if (cbss) { | |
746 | struct ieee80211_bss *bss; | |
46900298 | 747 | |
0c1ad2ca | 748 | bss = (void *)cbss->priv; |
46900298 | 749 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
46900298 | 750 | printk(KERN_DEBUG " sta_find_ibss: selected %pM current " |
0c1ad2ca | 751 | "%pM\n", cbss->bssid, ifibss->bssid); |
46900298 JB |
752 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
753 | ||
46900298 JB |
754 | printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM" |
755 | " based on configured SSID\n", | |
0c1ad2ca | 756 | sdata->name, cbss->bssid); |
46900298 | 757 | |
af8cdcd8 | 758 | ieee80211_sta_join_ibss(sdata, bss); |
46900298 | 759 | ieee80211_rx_bss_put(local, bss); |
af8cdcd8 | 760 | return; |
d419b9f0 | 761 | } |
46900298 JB |
762 | |
763 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
764 | printk(KERN_DEBUG " did not try to join ibss\n"); | |
765 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ | |
766 | ||
767 | /* Selected IBSS not found in current scan results - try to scan */ | |
ce9058ae | 768 | if (time_after(jiffies, ifibss->last_scan_completed + |
46900298 JB |
769 | IEEE80211_SCAN_INTERVAL)) { |
770 | printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to " | |
47846c9b | 771 | "join\n", sdata->name); |
46900298 | 772 | |
be4a4b6a JB |
773 | ieee80211_request_internal_scan(sdata, |
774 | ifibss->ssid, ifibss->ssid_len, | |
775 | ifibss->fixed_channel ? ifibss->channel : NULL); | |
ce9058ae | 776 | } else { |
46900298 JB |
777 | int interval = IEEE80211_SCAN_INTERVAL; |
778 | ||
779 | if (time_after(jiffies, ifibss->ibss_join_req + | |
780 | IEEE80211_IBSS_JOIN_TIMEOUT)) { | |
af8cdcd8 JB |
781 | if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) { |
782 | ieee80211_sta_create_ibss(sdata); | |
783 | return; | |
784 | } | |
46900298 | 785 | printk(KERN_DEBUG "%s: IBSS not allowed on" |
47846c9b | 786 | " %d MHz\n", sdata->name, |
46900298 JB |
787 | local->hw.conf.channel->center_freq); |
788 | ||
789 | /* No IBSS found - decrease scan interval and continue | |
790 | * scanning. */ | |
791 | interval = IEEE80211_SCAN_INTERVAL_SLOW; | |
792 | } | |
793 | ||
af8cdcd8 JB |
794 | mod_timer(&ifibss->timer, |
795 | round_jiffies(jiffies + interval)); | |
46900298 | 796 | } |
46900298 JB |
797 | } |
798 | ||
799 | static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, | |
c269a203 | 800 | struct sk_buff *req) |
46900298 | 801 | { |
c269a203 | 802 | struct ieee80211_mgmt *mgmt = (void *)req->data; |
46900298 JB |
803 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
804 | struct ieee80211_local *local = sdata->local; | |
c269a203 | 805 | int tx_last_beacon, len = req->len; |
46900298 JB |
806 | struct sk_buff *skb; |
807 | struct ieee80211_mgmt *resp; | |
40b275b6 | 808 | struct sk_buff *presp; |
46900298 JB |
809 | u8 *pos, *end; |
810 | ||
7a17a33c JB |
811 | lockdep_assert_held(&ifibss->mtx); |
812 | ||
40b275b6 JB |
813 | presp = rcu_dereference_protected(ifibss->presp, |
814 | lockdep_is_held(&ifibss->mtx)); | |
815 | ||
46900298 | 816 | if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || |
40b275b6 | 817 | len < 24 + 2 || !presp) |
46900298 JB |
818 | return; |
819 | ||
24487981 | 820 | tx_last_beacon = drv_tx_last_beacon(local); |
46900298 JB |
821 | |
822 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
823 | printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM" | |
824 | " (tx_last_beacon=%d)\n", | |
47846c9b | 825 | sdata->name, mgmt->sa, mgmt->da, |
46900298 JB |
826 | mgmt->bssid, tx_last_beacon); |
827 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ | |
828 | ||
1ed76487 | 829 | if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) |
46900298 JB |
830 | return; |
831 | ||
832 | if (memcmp(mgmt->bssid, ifibss->bssid, ETH_ALEN) != 0 && | |
833 | memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0) | |
834 | return; | |
835 | ||
836 | end = ((u8 *) mgmt) + len; | |
837 | pos = mgmt->u.probe_req.variable; | |
838 | if (pos[0] != WLAN_EID_SSID || | |
839 | pos + 2 + pos[1] > end) { | |
840 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
841 | printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq " | |
842 | "from %pM\n", | |
47846c9b | 843 | sdata->name, mgmt->sa); |
46900298 JB |
844 | #endif |
845 | return; | |
846 | } | |
847 | if (pos[1] != 0 && | |
848 | (pos[1] != ifibss->ssid_len || | |
0da780c2 | 849 | memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { |
46900298 JB |
850 | /* Ignore ProbeReq for foreign SSID */ |
851 | return; | |
852 | } | |
853 | ||
854 | /* Reply with ProbeResp */ | |
40b275b6 | 855 | skb = skb_copy(presp, GFP_KERNEL); |
46900298 JB |
856 | if (!skb) |
857 | return; | |
858 | ||
859 | resp = (struct ieee80211_mgmt *) skb->data; | |
860 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
861 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
862 | printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n", | |
47846c9b | 863 | sdata->name, resp->da); |
46900298 | 864 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
62ae67be JB |
865 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
866 | ieee80211_tx_skb(sdata, skb); | |
46900298 JB |
867 | } |
868 | ||
869 | static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, | |
870 | struct ieee80211_mgmt *mgmt, | |
871 | size_t len, | |
872 | struct ieee80211_rx_status *rx_status) | |
873 | { | |
874 | size_t baselen; | |
875 | struct ieee802_11_elems elems; | |
876 | ||
46900298 JB |
877 | baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; |
878 | if (baselen > len) | |
879 | return; | |
880 | ||
881 | ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, | |
882 | &elems); | |
883 | ||
884 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); | |
885 | } | |
886 | ||
887 | static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, | |
888 | struct ieee80211_mgmt *mgmt, | |
889 | size_t len, | |
890 | struct ieee80211_rx_status *rx_status) | |
891 | { | |
892 | size_t baselen; | |
893 | struct ieee802_11_elems elems; | |
894 | ||
895 | /* Process beacon from the current BSS */ | |
896 | baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; | |
897 | if (baselen > len) | |
898 | return; | |
899 | ||
900 | ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems); | |
901 | ||
902 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true); | |
903 | } | |
904 | ||
1fa57d01 JB |
905 | void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, |
906 | struct sk_buff *skb) | |
46900298 JB |
907 | { |
908 | struct ieee80211_rx_status *rx_status; | |
909 | struct ieee80211_mgmt *mgmt; | |
910 | u16 fc; | |
911 | ||
f1d58c25 | 912 | rx_status = IEEE80211_SKB_RXCB(skb); |
46900298 JB |
913 | mgmt = (struct ieee80211_mgmt *) skb->data; |
914 | fc = le16_to_cpu(mgmt->frame_control); | |
915 | ||
7a17a33c JB |
916 | mutex_lock(&sdata->u.ibss.mtx); |
917 | ||
c926d006 TH |
918 | if (!sdata->u.ibss.ssid_len) |
919 | goto mgmt_out; /* not ready to merge yet */ | |
920 | ||
46900298 JB |
921 | switch (fc & IEEE80211_FCTL_STYPE) { |
922 | case IEEE80211_STYPE_PROBE_REQ: | |
c269a203 | 923 | ieee80211_rx_mgmt_probe_req(sdata, skb); |
46900298 JB |
924 | break; |
925 | case IEEE80211_STYPE_PROBE_RESP: | |
926 | ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, | |
927 | rx_status); | |
928 | break; | |
929 | case IEEE80211_STYPE_BEACON: | |
930 | ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, | |
931 | rx_status); | |
932 | break; | |
933 | case IEEE80211_STYPE_AUTH: | |
934 | ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); | |
935 | break; | |
936 | } | |
7a17a33c | 937 | |
c926d006 | 938 | mgmt_out: |
7a17a33c | 939 | mutex_unlock(&sdata->u.ibss.mtx); |
46900298 JB |
940 | } |
941 | ||
1fa57d01 | 942 | void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) |
46900298 | 943 | { |
1fa57d01 | 944 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
8bf11d8d | 945 | struct sta_info *sta; |
46900298 | 946 | |
7a17a33c JB |
947 | mutex_lock(&ifibss->mtx); |
948 | ||
949 | /* | |
950 | * Work could be scheduled after scan or similar | |
951 | * when we aren't even joined (or trying) with a | |
952 | * network. | |
953 | */ | |
954 | if (!ifibss->ssid_len) | |
955 | goto out; | |
46900298 | 956 | |
8bf11d8d JB |
957 | spin_lock_bh(&ifibss->incomplete_lock); |
958 | while (!list_empty(&ifibss->incomplete_stations)) { | |
959 | sta = list_first_entry(&ifibss->incomplete_stations, | |
960 | struct sta_info, list); | |
961 | list_del(&sta->list); | |
962 | spin_unlock_bh(&ifibss->incomplete_lock); | |
963 | ||
6d810f10 | 964 | ieee80211_ibss_finish_sta(sta, true); |
8bf11d8d JB |
965 | rcu_read_unlock(); |
966 | spin_lock_bh(&ifibss->incomplete_lock); | |
967 | } | |
968 | spin_unlock_bh(&ifibss->incomplete_lock); | |
969 | ||
46900298 JB |
970 | switch (ifibss->state) { |
971 | case IEEE80211_IBSS_MLME_SEARCH: | |
972 | ieee80211_sta_find_ibss(sdata); | |
973 | break; | |
974 | case IEEE80211_IBSS_MLME_JOINED: | |
975 | ieee80211_sta_merge_ibss(sdata); | |
976 | break; | |
977 | default: | |
978 | WARN_ON(1); | |
979 | break; | |
980 | } | |
46900298 | 981 | |
7a17a33c JB |
982 | out: |
983 | mutex_unlock(&ifibss->mtx); | |
3a4d4aa2 JB |
984 | } |
985 | ||
46900298 JB |
986 | static void ieee80211_ibss_timer(unsigned long data) |
987 | { | |
988 | struct ieee80211_sub_if_data *sdata = | |
989 | (struct ieee80211_sub_if_data *) data; | |
990 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
991 | struct ieee80211_local *local = sdata->local; | |
992 | ||
5bb644a0 JB |
993 | if (local->quiescing) { |
994 | ifibss->timer_running = true; | |
995 | return; | |
996 | } | |
997 | ||
7a17a33c | 998 | ieee80211_queue_work(&local->hw, &sdata->work); |
46900298 JB |
999 | } |
1000 | ||
5bb644a0 JB |
1001 | #ifdef CONFIG_PM |
1002 | void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata) | |
1003 | { | |
1004 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1005 | ||
5bb644a0 JB |
1006 | if (del_timer_sync(&ifibss->timer)) |
1007 | ifibss->timer_running = true; | |
1008 | } | |
1009 | ||
1010 | void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata) | |
1011 | { | |
1012 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1013 | ||
1014 | if (ifibss->timer_running) { | |
1015 | add_timer(&ifibss->timer); | |
1016 | ifibss->timer_running = false; | |
1017 | } | |
1018 | } | |
1019 | #endif | |
1020 | ||
46900298 JB |
1021 | void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) |
1022 | { | |
1023 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1024 | ||
46900298 JB |
1025 | setup_timer(&ifibss->timer, ieee80211_ibss_timer, |
1026 | (unsigned long) sdata); | |
7a17a33c | 1027 | mutex_init(&ifibss->mtx); |
8bf11d8d JB |
1028 | INIT_LIST_HEAD(&ifibss->incomplete_stations); |
1029 | spin_lock_init(&ifibss->incomplete_lock); | |
46900298 JB |
1030 | } |
1031 | ||
1032 | /* scan finished notification */ | |
1033 | void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) | |
1034 | { | |
af8cdcd8 | 1035 | struct ieee80211_sub_if_data *sdata; |
46900298 | 1036 | |
29b4a4f7 JB |
1037 | mutex_lock(&local->iflist_mtx); |
1038 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 1039 | if (!ieee80211_sdata_running(sdata)) |
0e41f715 | 1040 | continue; |
af8cdcd8 JB |
1041 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
1042 | continue; | |
1043 | sdata->u.ibss.last_scan_completed = jiffies; | |
7a17a33c | 1044 | ieee80211_queue_work(&local->hw, &sdata->work); |
46900298 | 1045 | } |
29b4a4f7 | 1046 | mutex_unlock(&local->iflist_mtx); |
46900298 JB |
1047 | } |
1048 | ||
af8cdcd8 JB |
1049 | int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, |
1050 | struct cfg80211_ibss_params *params) | |
1051 | { | |
1052 | struct sk_buff *skb; | |
ff3cc5f4 | 1053 | u32 changed = 0; |
af8cdcd8 | 1054 | |
7a17a33c | 1055 | skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + |
13c40c54 AS |
1056 | sizeof(struct ieee80211_hdr_3addr) + |
1057 | 12 /* struct ieee80211_mgmt.u.beacon */ + | |
1058 | 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ + | |
1059 | 2 + 8 /* max Supported Rates */ + | |
1060 | 3 /* max DS params */ + | |
1061 | 4 /* IBSS params */ + | |
1062 | 2 + (IEEE80211_MAX_SUPP_RATES - 8) + | |
1063 | 2 + sizeof(struct ieee80211_ht_cap) + | |
1064 | 2 + sizeof(struct ieee80211_ht_info) + | |
7a17a33c JB |
1065 | params->ie_len); |
1066 | if (!skb) | |
1067 | return -ENOMEM; | |
1068 | ||
1069 | mutex_lock(&sdata->u.ibss.mtx); | |
1070 | ||
af8cdcd8 JB |
1071 | if (params->bssid) { |
1072 | memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); | |
1073 | sdata->u.ibss.fixed_bssid = true; | |
1074 | } else | |
1075 | sdata->u.ibss.fixed_bssid = false; | |
1076 | ||
fffd0934 | 1077 | sdata->u.ibss.privacy = params->privacy; |
fbd2c8dc | 1078 | sdata->u.ibss.basic_rates = params->basic_rates; |
dd5b4cc7 FF |
1079 | memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, |
1080 | sizeof(params->mcast_rate)); | |
fffd0934 | 1081 | |
57c4d7b4 JB |
1082 | sdata->vif.bss_conf.beacon_int = params->beacon_interval; |
1083 | ||
af8cdcd8 | 1084 | sdata->u.ibss.channel = params->channel; |
13c40c54 | 1085 | sdata->u.ibss.channel_type = params->channel_type; |
af8cdcd8 JB |
1086 | sdata->u.ibss.fixed_channel = params->channel_fixed; |
1087 | ||
adfba3c7 JB |
1088 | /* fix ourselves to that channel now already */ |
1089 | if (params->channel_fixed) { | |
1090 | sdata->local->oper_channel = params->channel; | |
13c40c54 | 1091 | if (!ieee80211_set_channel_type(sdata->local, sdata, |
fb03c5eb DC |
1092 | params->channel_type)) { |
1093 | mutex_unlock(&sdata->u.ibss.mtx); | |
cb71b8d8 | 1094 | kfree_skb(skb); |
13c40c54 | 1095 | return -EINVAL; |
fb03c5eb | 1096 | } |
adfba3c7 JB |
1097 | } |
1098 | ||
af8cdcd8 JB |
1099 | if (params->ie) { |
1100 | sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, | |
1101 | GFP_KERNEL); | |
1102 | if (sdata->u.ibss.ie) | |
1103 | sdata->u.ibss.ie_len = params->ie_len; | |
1104 | } | |
1105 | ||
af8cdcd8 JB |
1106 | sdata->u.ibss.skb = skb; |
1107 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; | |
1108 | sdata->u.ibss.ibss_join_req = jiffies; | |
1109 | ||
0e41f715 | 1110 | memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN); |
0e41f715 JB |
1111 | sdata->u.ibss.ssid_len = params->ssid_len; |
1112 | ||
7da7cc1d JB |
1113 | mutex_unlock(&sdata->u.ibss.mtx); |
1114 | ||
1115 | mutex_lock(&sdata->local->mtx); | |
5cff20e6 | 1116 | ieee80211_recalc_idle(sdata->local); |
7da7cc1d | 1117 | mutex_unlock(&sdata->local->mtx); |
5cff20e6 | 1118 | |
ff3cc5f4 SW |
1119 | /* |
1120 | * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is | |
1121 | * reserved, but an HT STA shall protect HT transmissions as though | |
1122 | * the HT Protection field were set to non-HT mixed mode. | |
1123 | * | |
1124 | * In an IBSS, the RIFS Mode field of the HT Operation element is | |
1125 | * also reserved, but an HT STA shall operate as though this field | |
1126 | * were set to 1. | |
1127 | */ | |
1128 | ||
1129 | sdata->vif.bss_conf.ht_operation_mode |= | |
1130 | IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | |
1131 | | IEEE80211_HT_PARAM_RIFS_MODE; | |
1132 | ||
1133 | changed |= BSS_CHANGED_HT; | |
1134 | ieee80211_bss_info_change_notify(sdata, changed); | |
1135 | ||
64592c8f | 1136 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
af8cdcd8 JB |
1137 | |
1138 | return 0; | |
1139 | } | |
1140 | ||
1141 | int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) | |
1142 | { | |
1143 | struct sk_buff *skb; | |
5ea096c0 TP |
1144 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
1145 | struct ieee80211_local *local = sdata->local; | |
1146 | struct cfg80211_bss *cbss; | |
1147 | u16 capability; | |
7a17a33c | 1148 | int active_ibss; |
8bf11d8d | 1149 | struct sta_info *sta; |
7a17a33c JB |
1150 | |
1151 | mutex_lock(&sdata->u.ibss.mtx); | |
5ea096c0 | 1152 | |
f3209bea JB |
1153 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; |
1154 | memset(sdata->u.ibss.bssid, 0, ETH_ALEN); | |
1155 | sdata->u.ibss.ssid_len = 0; | |
1156 | ||
5ea096c0 TP |
1157 | active_ibss = ieee80211_sta_active_ibss(sdata); |
1158 | ||
1159 | if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) { | |
1160 | capability = WLAN_CAPABILITY_IBSS; | |
1161 | ||
1162 | if (ifibss->privacy) | |
1163 | capability |= WLAN_CAPABILITY_PRIVACY; | |
1164 | ||
1165 | cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->channel, | |
1166 | ifibss->bssid, ifibss->ssid, | |
1167 | ifibss->ssid_len, WLAN_CAPABILITY_IBSS | | |
1168 | WLAN_CAPABILITY_PRIVACY, | |
1169 | capability); | |
1170 | ||
1171 | if (cbss) { | |
1172 | cfg80211_unlink_bss(local->hw.wiphy, cbss); | |
1173 | cfg80211_put_bss(cbss); | |
1174 | } | |
1175 | } | |
af8cdcd8 | 1176 | |
af8cdcd8 | 1177 | sta_info_flush(sdata->local, sdata); |
8bf11d8d JB |
1178 | |
1179 | spin_lock_bh(&ifibss->incomplete_lock); | |
1180 | while (!list_empty(&ifibss->incomplete_stations)) { | |
1181 | sta = list_first_entry(&ifibss->incomplete_stations, | |
1182 | struct sta_info, list); | |
1183 | list_del(&sta->list); | |
1184 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1185 | ||
1186 | sta_info_free(local, sta); | |
1187 | spin_lock_bh(&ifibss->incomplete_lock); | |
1188 | } | |
1189 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1190 | ||
86a2ea41 | 1191 | netif_carrier_off(sdata->dev); |
af8cdcd8 JB |
1192 | |
1193 | /* remove beacon */ | |
1194 | kfree(sdata->u.ibss.ie); | |
40b275b6 JB |
1195 | skb = rcu_dereference_protected(sdata->u.ibss.presp, |
1196 | lockdep_is_held(&sdata->u.ibss.mtx)); | |
a9b3cd7f | 1197 | RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); |
8fc214ba JB |
1198 | sdata->vif.bss_conf.ibss_joined = false; |
1199 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | | |
1200 | BSS_CHANGED_IBSS); | |
af8cdcd8 JB |
1201 | synchronize_rcu(); |
1202 | kfree_skb(skb); | |
1203 | ||
35f20c14 | 1204 | skb_queue_purge(&sdata->skb_queue); |
5cff20e6 | 1205 | |
bc05d19f | 1206 | del_timer_sync(&sdata->u.ibss.timer); |
7a17a33c JB |
1207 | |
1208 | mutex_unlock(&sdata->u.ibss.mtx); | |
bc05d19f | 1209 | |
7da7cc1d | 1210 | mutex_lock(&local->mtx); |
5cff20e6 | 1211 | ieee80211_recalc_idle(sdata->local); |
7da7cc1d | 1212 | mutex_unlock(&local->mtx); |
af8cdcd8 JB |
1213 | |
1214 | return 0; | |
1215 | } |