]>
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> | |
46900298 JB |
23 | |
24 | #include "ieee80211_i.h" | |
24487981 | 25 | #include "driver-ops.h" |
46900298 JB |
26 | #include "rate.h" |
27 | ||
28 | #define IEEE80211_SCAN_INTERVAL (2 * HZ) | |
29 | #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ) | |
30 | #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ) | |
31 | ||
32 | #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ) | |
33 | #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ) | |
34 | ||
35 | #define IEEE80211_IBSS_MAX_STA_ENTRIES 128 | |
36 | ||
37 | ||
af8cdcd8 JB |
38 | static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
39 | const u8 *bssid, const int beacon_int, | |
40 | struct ieee80211_channel *chan, | |
b59066a2 | 41 | const u32 basic_rates, |
af8cdcd8 | 42 | const u16 capability, u64 tsf) |
46900298 JB |
43 | { |
44 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
45 | struct ieee80211_local *local = sdata->local; | |
b59066a2 | 46 | int rates, i; |
46900298 JB |
47 | struct sk_buff *skb; |
48 | struct ieee80211_mgmt *mgmt; | |
49 | u8 *pos; | |
50 | struct ieee80211_supported_band *sband; | |
f446d10f | 51 | struct cfg80211_bss *bss; |
57c4d7b4 | 52 | u32 bss_change; |
b59066a2 | 53 | u8 supp_rates[IEEE80211_MAX_SUPP_RATES]; |
13c40c54 | 54 | enum nl80211_channel_type channel_type; |
24487981 | 55 | |
7a17a33c JB |
56 | lockdep_assert_held(&ifibss->mtx); |
57 | ||
24487981 | 58 | /* Reset own TSF to allow time synchronization work. */ |
37a41b4a | 59 | drv_reset_tsf(local, sdata); |
46900298 | 60 | |
af8cdcd8 | 61 | skb = ifibss->skb; |
a9b3cd7f | 62 | RCU_INIT_POINTER(ifibss->presp, NULL); |
af8cdcd8 JB |
63 | synchronize_rcu(); |
64 | skb->data = skb->head; | |
65 | skb->len = 0; | |
66 | skb_reset_tail_pointer(skb); | |
67 | skb_reserve(skb, sdata->local->hw.extra_tx_headroom); | |
46900298 | 68 | |
b203ca39 | 69 | if (!ether_addr_equal(ifibss->bssid, bssid)) |
af8cdcd8 | 70 | sta_info_flush(sdata->local, sdata); |
46900298 | 71 | |
49b5c7f4 JB |
72 | /* if merging, indicate to driver that we leave the old IBSS */ |
73 | if (sdata->vif.bss_conf.ibss_joined) { | |
74 | sdata->vif.bss_conf.ibss_joined = false; | |
86a2ea41 | 75 | netif_carrier_off(sdata->dev); |
49b5c7f4 JB |
76 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IBSS); |
77 | } | |
78 | ||
46900298 | 79 | memcpy(ifibss->bssid, bssid, ETH_ALEN); |
46900298 | 80 | |
af8cdcd8 | 81 | sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0; |
46900298 | 82 | |
ba196025 | 83 | local->oper_channel = chan; |
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) + | |
074d46d1 | 163 | sizeof(struct ieee80211_ht_operation)); |
13c40c54 AS |
164 | pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, |
165 | sband->ht_cap.cap); | |
0d894ec5 AN |
166 | /* |
167 | * Note: According to 802.11n-2009 9.13.3.1, HT Protection | |
168 | * field and RIFS Mode are reserved in IBSS mode, therefore | |
169 | * keep them at 0 | |
170 | */ | |
074d46d1 | 171 | pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap, |
431e3154 | 172 | chan, channel_type, 0); |
13c40c54 AS |
173 | } |
174 | ||
32c5057b | 175 | if (local->hw.queues >= IEEE80211_NUM_ACS) { |
9eba6125 BR |
176 | pos = skb_put(skb, 9); |
177 | *pos++ = WLAN_EID_VENDOR_SPECIFIC; | |
178 | *pos++ = 7; /* len */ | |
179 | *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */ | |
180 | *pos++ = 0x50; | |
181 | *pos++ = 0xf2; | |
182 | *pos++ = 2; /* WME */ | |
183 | *pos++ = 0; /* WME info */ | |
184 | *pos++ = 1; /* WME ver */ | |
185 | *pos++ = 0; /* U-APSD no in use */ | |
186 | } | |
187 | ||
cf778b00 | 188 | rcu_assign_pointer(ifibss->presp, skb); |
46900298 | 189 | |
2d0ddec5 | 190 | sdata->vif.bss_conf.beacon_int = beacon_int; |
fbd2c8dc | 191 | sdata->vif.bss_conf.basic_rates = basic_rates; |
2d0ddec5 JB |
192 | bss_change = BSS_CHANGED_BEACON_INT; |
193 | bss_change |= ieee80211_reset_erp_info(sdata); | |
194 | bss_change |= BSS_CHANGED_BSSID; | |
195 | bss_change |= BSS_CHANGED_BEACON; | |
196 | bss_change |= BSS_CHANGED_BEACON_ENABLED; | |
392cfdb1 | 197 | bss_change |= BSS_CHANGED_BASIC_RATES; |
13c40c54 | 198 | bss_change |= BSS_CHANGED_HT; |
8fc214ba JB |
199 | bss_change |= BSS_CHANGED_IBSS; |
200 | sdata->vif.bss_conf.ibss_joined = true; | |
2d0ddec5 | 201 | ieee80211_bss_info_change_notify(sdata, bss_change); |
46900298 | 202 | |
b59066a2 | 203 | ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates); |
46900298 | 204 | |
46900298 | 205 | ifibss->state = IEEE80211_IBSS_MLME_JOINED; |
af8cdcd8 JB |
206 | mod_timer(&ifibss->timer, |
207 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 | 208 | |
f446d10f JB |
209 | bss = cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel, |
210 | mgmt, skb->len, 0, GFP_KERNEL); | |
211 | cfg80211_put_bss(bss); | |
86a2ea41 | 212 | netif_carrier_on(sdata->dev); |
af8cdcd8 | 213 | cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL); |
46900298 JB |
214 | } |
215 | ||
af8cdcd8 JB |
216 | static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
217 | struct ieee80211_bss *bss) | |
46900298 | 218 | { |
0c1ad2ca JB |
219 | struct cfg80211_bss *cbss = |
220 | container_of((void *)bss, struct cfg80211_bss, priv); | |
b59066a2 JB |
221 | struct ieee80211_supported_band *sband; |
222 | u32 basic_rates; | |
223 | int i, j; | |
0c1ad2ca | 224 | u16 beacon_int = cbss->beacon_interval; |
57c4d7b4 | 225 | |
7a17a33c JB |
226 | lockdep_assert_held(&sdata->u.ibss.mtx); |
227 | ||
57c4d7b4 JB |
228 | if (beacon_int < 10) |
229 | beacon_int = 10; | |
230 | ||
0c1ad2ca | 231 | sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; |
b59066a2 JB |
232 | |
233 | basic_rates = 0; | |
234 | ||
235 | for (i = 0; i < bss->supp_rates_len; i++) { | |
236 | int rate = (bss->supp_rates[i] & 0x7f) * 5; | |
237 | bool is_basic = !!(bss->supp_rates[i] & 0x80); | |
238 | ||
239 | for (j = 0; j < sband->n_bitrates; j++) { | |
240 | if (sband->bitrates[j].bitrate == rate) { | |
241 | if (is_basic) | |
242 | basic_rates |= BIT(j); | |
243 | break; | |
244 | } | |
245 | } | |
246 | } | |
247 | ||
0c1ad2ca | 248 | __ieee80211_sta_join_ibss(sdata, cbss->bssid, |
57c4d7b4 | 249 | beacon_int, |
0c1ad2ca | 250 | cbss->channel, |
b59066a2 | 251 | basic_rates, |
0c1ad2ca JB |
252 | cbss->capability, |
253 | cbss->tsf); | |
46900298 JB |
254 | } |
255 | ||
6d810f10 AQ |
256 | static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta, |
257 | bool auth) | |
8bf11d8d JB |
258 | __acquires(RCU) |
259 | { | |
260 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
261 | u8 addr[ETH_ALEN]; | |
262 | ||
263 | memcpy(addr, sta->sta.addr, ETH_ALEN); | |
264 | ||
265 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
266 | wiphy_debug(sdata->local->hw.wiphy, | |
267 | "Adding new IBSS station %pM (dev=%s)\n", | |
268 | addr, sdata->name); | |
269 | #endif | |
270 | ||
83d5cc01 JB |
271 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); |
272 | sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); | |
267335d6 AQ |
273 | /* authorize the station only if the network is not RSN protected. If |
274 | * not wait for the userspace to authorize it */ | |
275 | if (!sta->sdata->u.ibss.control_port) | |
276 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); | |
8bf11d8d JB |
277 | |
278 | rate_control_rate_init(sta); | |
279 | ||
280 | /* If it fails, maybe we raced another insertion? */ | |
281 | if (sta_info_insert_rcu(sta)) | |
282 | return sta_info_get(sdata, addr); | |
6d810f10 | 283 | if (auth) { |
499f42bb JP |
284 | ibss_vdbg("TX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=1)\n", |
285 | sdata->vif.addr, sdata->u.ibss.bssid, addr); | |
6d810f10 AQ |
286 | ieee80211_send_auth(sdata, 1, WLAN_AUTH_OPEN, NULL, 0, |
287 | addr, sdata->u.ibss.bssid, NULL, 0, 0); | |
288 | } | |
8bf11d8d JB |
289 | return sta; |
290 | } | |
291 | ||
292 | static struct sta_info * | |
293 | ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, | |
294 | const u8 *bssid, const u8 *addr, | |
6d810f10 | 295 | u32 supp_rates, bool auth) |
8bf11d8d JB |
296 | __acquires(RCU) |
297 | { | |
298 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
299 | struct ieee80211_local *local = sdata->local; | |
300 | struct sta_info *sta; | |
301 | int band = local->hw.conf.channel->band; | |
302 | ||
303 | /* | |
304 | * XXX: Consider removing the least recently used entry and | |
305 | * allow new one to be added. | |
306 | */ | |
307 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { | |
e87cc472 JP |
308 | net_dbg_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
309 | sdata->name, addr); | |
8bf11d8d JB |
310 | rcu_read_lock(); |
311 | return NULL; | |
312 | } | |
313 | ||
314 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { | |
315 | rcu_read_lock(); | |
316 | return NULL; | |
317 | } | |
318 | ||
b203ca39 | 319 | if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) { |
8bf11d8d JB |
320 | rcu_read_lock(); |
321 | return NULL; | |
322 | } | |
323 | ||
324 | sta = sta_info_alloc(sdata, addr, GFP_KERNEL); | |
325 | if (!sta) { | |
326 | rcu_read_lock(); | |
327 | return NULL; | |
328 | } | |
329 | ||
330 | sta->last_rx = jiffies; | |
331 | ||
332 | /* make sure mandatory rates are always added */ | |
333 | sta->sta.supp_rates[band] = supp_rates | | |
334 | ieee80211_mandatory_rates(local, band); | |
335 | ||
6d810f10 AQ |
336 | return ieee80211_ibss_finish_sta(sta, auth); |
337 | } | |
338 | ||
339 | static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, | |
340 | struct ieee80211_mgmt *mgmt, | |
341 | size_t len) | |
342 | { | |
343 | u16 auth_alg, auth_transaction; | |
344 | ||
345 | lockdep_assert_held(&sdata->u.ibss.mtx); | |
346 | ||
347 | if (len < 24 + 6) | |
348 | return; | |
349 | ||
350 | auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); | |
351 | auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); | |
352 | ||
353 | if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) | |
354 | return; | |
499f42bb JP |
355 | ibss_vdbg("%s: RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n", |
356 | sdata->name, mgmt->sa, mgmt->da, mgmt->bssid, | |
357 | auth_transaction); | |
6d810f10 AQ |
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 && |
b203ca39 | 403 | ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) { |
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, | |
9ebb61a2 | 410 | band, NULL); |
9eba6125 BR |
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) { |
499f42bb JP |
420 | ibss_vdbg("%s: updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", |
421 | sdata->name, sta->sta.addr, | |
422 | prev_rates, | |
423 | sta->sta.supp_rates[band]); | |
13c40c54 | 424 | rates_updated = true; |
9eba6125 | 425 | } |
8bf11d8d JB |
426 | } else { |
427 | rcu_read_unlock(); | |
9eba6125 | 428 | sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, |
6d810f10 | 429 | mgmt->sa, supp_rates, true); |
8bf11d8d | 430 | } |
34e89507 | 431 | } |
9eba6125 BR |
432 | |
433 | if (sta && elems->wmm_info) | |
c2c98fde | 434 | set_sta_flag(sta, WLAN_STA_WME); |
9eba6125 | 435 | |
074d46d1 | 436 | if (sta && elems->ht_operation && elems->ht_cap_elem && |
13c40c54 AS |
437 | sdata->u.ibss.channel_type != NL80211_CHAN_NO_HT) { |
438 | /* we both use HT */ | |
439 | struct ieee80211_sta_ht_cap sta_ht_cap_new; | |
440 | enum nl80211_channel_type channel_type = | |
074d46d1 JB |
441 | ieee80211_ht_oper_to_channel_type( |
442 | elems->ht_operation); | |
13c40c54 AS |
443 | |
444 | ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, | |
445 | elems->ht_cap_elem, | |
446 | &sta_ht_cap_new); | |
447 | ||
448 | /* | |
449 | * fall back to HT20 if we don't use or use | |
450 | * the other extension channel | |
451 | */ | |
6741e7f0 FF |
452 | if (!(channel_type == NL80211_CHAN_HT40MINUS || |
453 | channel_type == NL80211_CHAN_HT40PLUS) || | |
13c40c54 AS |
454 | channel_type != sdata->u.ibss.channel_type) |
455 | sta_ht_cap_new.cap &= | |
456 | ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; | |
457 | ||
458 | if (memcmp(&sta->sta.ht_cap, &sta_ht_cap_new, | |
459 | sizeof(sta_ht_cap_new))) { | |
460 | memcpy(&sta->sta.ht_cap, &sta_ht_cap_new, | |
461 | sizeof(sta_ht_cap_new)); | |
462 | rates_updated = true; | |
463 | } | |
464 | } | |
465 | ||
466 | if (sta && rates_updated) | |
467 | rate_control_rate_init(sta); | |
468 | ||
9eba6125 | 469 | rcu_read_unlock(); |
46900298 JB |
470 | } |
471 | ||
472 | bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, | |
473 | channel, beacon); | |
474 | if (!bss) | |
475 | return; | |
476 | ||
0c1ad2ca JB |
477 | cbss = container_of((void *)bss, struct cfg80211_bss, priv); |
478 | ||
46900298 | 479 | /* was just updated in ieee80211_bss_info_update */ |
0c1ad2ca | 480 | beacon_timestamp = cbss->tsf; |
46900298 JB |
481 | |
482 | /* check if we need to merge IBSS */ | |
483 | ||
46900298 | 484 | /* we use a fixed BSSID */ |
a98bfec2 | 485 | if (sdata->u.ibss.fixed_bssid) |
46900298 JB |
486 | goto put_bss; |
487 | ||
488 | /* not an IBSS */ | |
0c1ad2ca | 489 | if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) |
46900298 JB |
490 | goto put_bss; |
491 | ||
492 | /* different channel */ | |
0c1ad2ca | 493 | if (cbss->channel != local->oper_channel) |
46900298 JB |
494 | goto put_bss; |
495 | ||
496 | /* different SSID */ | |
497 | if (elems->ssid_len != sdata->u.ibss.ssid_len || | |
498 | memcmp(elems->ssid, sdata->u.ibss.ssid, | |
499 | sdata->u.ibss.ssid_len)) | |
500 | goto put_bss; | |
501 | ||
34e8f082 | 502 | /* same BSSID */ |
b203ca39 | 503 | if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) |
34e8f082 AF |
504 | goto put_bss; |
505 | ||
6ebacbb7 | 506 | if (rx_status->flag & RX_FLAG_MACTIME_MPDU) { |
46900298 JB |
507 | /* |
508 | * For correct IBSS merging we need mactime; since mactime is | |
509 | * defined as the time the first data symbol of the frame hits | |
510 | * the PHY, and the timestamp of the beacon is defined as "the | |
511 | * time that the data symbol containing the first bit of the | |
512 | * timestamp is transmitted to the PHY plus the transmitting | |
513 | * STA's delays through its local PHY from the MAC-PHY | |
514 | * interface to its interface with the WM" (802.11 11.1.2) | |
515 | * - equals the time this bit arrives at the receiver - we have | |
516 | * to take into account the offset between the two. | |
517 | * | |
518 | * E.g. at 1 MBit that means mactime is 192 usec earlier | |
519 | * (=24 bytes * 8 usecs/byte) than the beacon timestamp. | |
520 | */ | |
521 | int rate; | |
522 | ||
523 | if (rx_status->flag & RX_FLAG_HT) | |
524 | rate = 65; /* TODO: HT rates */ | |
525 | else | |
526 | rate = local->hw.wiphy->bands[band]-> | |
527 | bitrates[rx_status->rate_idx].bitrate; | |
528 | ||
529 | rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate); | |
24487981 JB |
530 | } else { |
531 | /* | |
532 | * second best option: get current TSF | |
533 | * (will return -1 if not supported) | |
534 | */ | |
37a41b4a | 535 | rx_timestamp = drv_get_tsf(local, sdata); |
24487981 | 536 | } |
46900298 | 537 | |
499f42bb JP |
538 | ibss_vdbg("RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", |
539 | mgmt->sa, mgmt->bssid, | |
540 | (unsigned long long)rx_timestamp, | |
541 | (unsigned long long)beacon_timestamp, | |
542 | (unsigned long long)(rx_timestamp - beacon_timestamp), | |
543 | jiffies); | |
46900298 JB |
544 | |
545 | if (beacon_timestamp > rx_timestamp) { | |
499f42bb JP |
546 | ibss_vdbg("%s: beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", |
547 | sdata->name, mgmt->bssid); | |
46900298 | 548 | ieee80211_sta_join_ibss(sdata, bss); |
9ebb61a2 | 549 | supp_rates = ieee80211_sta_get_rates(local, elems, band, NULL); |
34e89507 | 550 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, |
6d810f10 | 551 | supp_rates, true); |
8bf11d8d | 552 | rcu_read_unlock(); |
46900298 JB |
553 | } |
554 | ||
555 | put_bss: | |
556 | ieee80211_rx_bss_put(local, bss); | |
557 | } | |
558 | ||
8bf11d8d JB |
559 | void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, |
560 | const u8 *bssid, const u8 *addr, | |
561 | u32 supp_rates) | |
46900298 | 562 | { |
2e10d330 | 563 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
46900298 JB |
564 | struct ieee80211_local *local = sdata->local; |
565 | struct sta_info *sta; | |
566 | int band = local->hw.conf.channel->band; | |
567 | ||
af8cdcd8 JB |
568 | /* |
569 | * XXX: Consider removing the least recently used entry and | |
570 | * allow new one to be added. | |
571 | */ | |
46900298 | 572 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { |
e87cc472 JP |
573 | net_dbg_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
574 | sdata->name, addr); | |
8bf11d8d | 575 | return; |
46900298 JB |
576 | } |
577 | ||
2e10d330 | 578 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) |
8bf11d8d | 579 | return; |
2e10d330 | 580 | |
b203ca39 | 581 | if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) |
8bf11d8d | 582 | return; |
46900298 | 583 | |
8bf11d8d | 584 | sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); |
46900298 | 585 | if (!sta) |
8bf11d8d | 586 | return; |
46900298 | 587 | |
c8716d9d | 588 | sta->last_rx = jiffies; |
d9a7ddb0 | 589 | |
46900298 JB |
590 | /* make sure mandatory rates are always added */ |
591 | sta->sta.supp_rates[band] = supp_rates | | |
592 | ieee80211_mandatory_rates(local, band); | |
593 | ||
8bf11d8d JB |
594 | spin_lock(&ifibss->incomplete_lock); |
595 | list_add(&sta->list, &ifibss->incomplete_stations); | |
596 | spin_unlock(&ifibss->incomplete_lock); | |
597 | ieee80211_queue_work(&local->hw, &sdata->work); | |
46900298 JB |
598 | } |
599 | ||
600 | static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) | |
601 | { | |
602 | struct ieee80211_local *local = sdata->local; | |
603 | int active = 0; | |
604 | struct sta_info *sta; | |
605 | ||
7a17a33c JB |
606 | lockdep_assert_held(&sdata->u.ibss.mtx); |
607 | ||
46900298 JB |
608 | rcu_read_lock(); |
609 | ||
610 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
611 | if (sta->sdata == sdata && | |
612 | time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL, | |
613 | jiffies)) { | |
614 | active++; | |
615 | break; | |
616 | } | |
617 | } | |
618 | ||
619 | rcu_read_unlock(); | |
620 | ||
621 | return active; | |
622 | } | |
623 | ||
ce9058ae BP |
624 | /* |
625 | * This function is called with state == IEEE80211_IBSS_MLME_JOINED | |
626 | */ | |
46900298 JB |
627 | |
628 | static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) | |
629 | { | |
630 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
631 | ||
7a17a33c JB |
632 | lockdep_assert_held(&ifibss->mtx); |
633 | ||
af8cdcd8 JB |
634 | mod_timer(&ifibss->timer, |
635 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 JB |
636 | |
637 | ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT); | |
af8cdcd8 | 638 | |
450aae3d S |
639 | if (time_before(jiffies, ifibss->last_scan_completed + |
640 | IEEE80211_IBSS_MERGE_INTERVAL)) | |
641 | return; | |
642 | ||
46900298 JB |
643 | if (ieee80211_sta_active_ibss(sdata)) |
644 | return; | |
645 | ||
c037b836 | 646 | if (ifibss->fixed_channel) |
46900298 JB |
647 | return; |
648 | ||
f0d23208 JP |
649 | pr_debug("%s: No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n", |
650 | sdata->name); | |
46900298 | 651 | |
be4a4b6a | 652 | ieee80211_request_internal_scan(sdata, |
c037b836 | 653 | ifibss->ssid, ifibss->ssid_len, NULL); |
46900298 JB |
654 | } |
655 | ||
af8cdcd8 | 656 | static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
657 | { |
658 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
46900298 | 659 | u8 bssid[ETH_ALEN]; |
46900298 JB |
660 | u16 capability; |
661 | int i; | |
662 | ||
7a17a33c JB |
663 | lockdep_assert_held(&ifibss->mtx); |
664 | ||
af8cdcd8 | 665 | if (ifibss->fixed_bssid) { |
46900298 JB |
666 | memcpy(bssid, ifibss->bssid, ETH_ALEN); |
667 | } else { | |
668 | /* Generate random, not broadcast, locally administered BSSID. Mix in | |
669 | * own MAC address to make sure that devices that do not have proper | |
670 | * random number generator get different BSSID. */ | |
671 | get_random_bytes(bssid, ETH_ALEN); | |
672 | for (i = 0; i < ETH_ALEN; i++) | |
47846c9b | 673 | bssid[i] ^= sdata->vif.addr[i]; |
46900298 JB |
674 | bssid[0] &= ~0x01; |
675 | bssid[0] |= 0x02; | |
676 | } | |
677 | ||
f0d23208 JP |
678 | pr_debug("%s: Creating new IBSS network, BSSID %pM\n", |
679 | sdata->name, bssid); | |
46900298 | 680 | |
46900298 JB |
681 | capability = WLAN_CAPABILITY_IBSS; |
682 | ||
fffd0934 | 683 | if (ifibss->privacy) |
46900298 JB |
684 | capability |= WLAN_CAPABILITY_PRIVACY; |
685 | else | |
686 | sdata->drop_unencrypted = 0; | |
687 | ||
57c4d7b4 | 688 | __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, |
fbd2c8dc | 689 | ifibss->channel, ifibss->basic_rates, |
b59066a2 | 690 | capability, 0); |
46900298 JB |
691 | } |
692 | ||
ce9058ae BP |
693 | /* |
694 | * This function is called with state == IEEE80211_IBSS_MLME_SEARCH | |
695 | */ | |
696 | ||
af8cdcd8 | 697 | static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
698 | { |
699 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
700 | struct ieee80211_local *local = sdata->local; | |
0c1ad2ca | 701 | struct cfg80211_bss *cbss; |
af8cdcd8 | 702 | struct ieee80211_channel *chan = NULL; |
46900298 JB |
703 | const u8 *bssid = NULL; |
704 | int active_ibss; | |
e0d61887 | 705 | u16 capability; |
46900298 | 706 | |
7a17a33c JB |
707 | lockdep_assert_held(&ifibss->mtx); |
708 | ||
46900298 | 709 | active_ibss = ieee80211_sta_active_ibss(sdata); |
499f42bb JP |
710 | ibss_vdbg("%s: sta_find_ibss (active_ibss=%d)\n", |
711 | sdata->name, active_ibss); | |
46900298 JB |
712 | |
713 | if (active_ibss) | |
af8cdcd8 | 714 | return; |
46900298 | 715 | |
e0d61887 | 716 | capability = WLAN_CAPABILITY_IBSS; |
fffd0934 | 717 | if (ifibss->privacy) |
e0d61887 | 718 | capability |= WLAN_CAPABILITY_PRIVACY; |
af8cdcd8 JB |
719 | if (ifibss->fixed_bssid) |
720 | bssid = ifibss->bssid; | |
721 | if (ifibss->fixed_channel) | |
722 | chan = ifibss->channel; | |
723 | if (!is_zero_ether_addr(ifibss->bssid)) | |
46900298 | 724 | bssid = ifibss->bssid; |
0c1ad2ca JB |
725 | cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, |
726 | ifibss->ssid, ifibss->ssid_len, | |
727 | WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY, | |
728 | capability); | |
729 | ||
730 | if (cbss) { | |
731 | struct ieee80211_bss *bss; | |
46900298 | 732 | |
0c1ad2ca | 733 | bss = (void *)cbss->priv; |
499f42bb JP |
734 | ibss_vdbg(" sta_find_ibss: selected %pM current %pM\n", |
735 | cbss->bssid, ifibss->bssid); | |
f0d23208 JP |
736 | pr_debug("%s: Selected IBSS BSSID %pM based on configured SSID\n", |
737 | sdata->name, cbss->bssid); | |
46900298 | 738 | |
af8cdcd8 | 739 | ieee80211_sta_join_ibss(sdata, bss); |
46900298 | 740 | ieee80211_rx_bss_put(local, bss); |
af8cdcd8 | 741 | return; |
d419b9f0 | 742 | } |
46900298 | 743 | |
499f42bb | 744 | ibss_vdbg(" did not try to join ibss\n"); |
46900298 JB |
745 | |
746 | /* Selected IBSS not found in current scan results - try to scan */ | |
ce9058ae | 747 | if (time_after(jiffies, ifibss->last_scan_completed + |
46900298 | 748 | IEEE80211_SCAN_INTERVAL)) { |
f0d23208 JP |
749 | pr_debug("%s: Trigger new scan to find an IBSS to join\n", |
750 | sdata->name); | |
46900298 | 751 | |
be4a4b6a JB |
752 | ieee80211_request_internal_scan(sdata, |
753 | ifibss->ssid, ifibss->ssid_len, | |
754 | ifibss->fixed_channel ? ifibss->channel : NULL); | |
ce9058ae | 755 | } else { |
46900298 JB |
756 | int interval = IEEE80211_SCAN_INTERVAL; |
757 | ||
758 | if (time_after(jiffies, ifibss->ibss_join_req + | |
759 | IEEE80211_IBSS_JOIN_TIMEOUT)) { | |
af8cdcd8 JB |
760 | if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) { |
761 | ieee80211_sta_create_ibss(sdata); | |
762 | return; | |
763 | } | |
f0d23208 JP |
764 | pr_debug("%s: IBSS not allowed on %d MHz\n", |
765 | sdata->name, | |
766 | local->hw.conf.channel->center_freq); | |
46900298 JB |
767 | |
768 | /* No IBSS found - decrease scan interval and continue | |
769 | * scanning. */ | |
770 | interval = IEEE80211_SCAN_INTERVAL_SLOW; | |
771 | } | |
772 | ||
af8cdcd8 JB |
773 | mod_timer(&ifibss->timer, |
774 | round_jiffies(jiffies + interval)); | |
46900298 | 775 | } |
46900298 JB |
776 | } |
777 | ||
778 | static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, | |
c269a203 | 779 | struct sk_buff *req) |
46900298 | 780 | { |
c269a203 | 781 | struct ieee80211_mgmt *mgmt = (void *)req->data; |
46900298 JB |
782 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
783 | struct ieee80211_local *local = sdata->local; | |
c269a203 | 784 | int tx_last_beacon, len = req->len; |
46900298 JB |
785 | struct sk_buff *skb; |
786 | struct ieee80211_mgmt *resp; | |
40b275b6 | 787 | struct sk_buff *presp; |
46900298 JB |
788 | u8 *pos, *end; |
789 | ||
7a17a33c JB |
790 | lockdep_assert_held(&ifibss->mtx); |
791 | ||
40b275b6 JB |
792 | presp = rcu_dereference_protected(ifibss->presp, |
793 | lockdep_is_held(&ifibss->mtx)); | |
794 | ||
46900298 | 795 | if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || |
40b275b6 | 796 | len < 24 + 2 || !presp) |
46900298 JB |
797 | return; |
798 | ||
24487981 | 799 | tx_last_beacon = drv_tx_last_beacon(local); |
46900298 | 800 | |
499f42bb JP |
801 | ibss_vdbg("%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n", |
802 | sdata->name, mgmt->sa, mgmt->da, | |
803 | mgmt->bssid, tx_last_beacon); | |
46900298 | 804 | |
1ed76487 | 805 | if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) |
46900298 JB |
806 | return; |
807 | ||
b203ca39 | 808 | if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && |
888d04df | 809 | !is_broadcast_ether_addr(mgmt->bssid)) |
46900298 JB |
810 | return; |
811 | ||
812 | end = ((u8 *) mgmt) + len; | |
813 | pos = mgmt->u.probe_req.variable; | |
814 | if (pos[0] != WLAN_EID_SSID || | |
815 | pos + 2 + pos[1] > end) { | |
499f42bb JP |
816 | ibss_vdbg("%s: Invalid SSID IE in ProbeReq from %pM\n", |
817 | sdata->name, mgmt->sa); | |
46900298 JB |
818 | return; |
819 | } | |
820 | if (pos[1] != 0 && | |
821 | (pos[1] != ifibss->ssid_len || | |
0da780c2 | 822 | memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { |
46900298 JB |
823 | /* Ignore ProbeReq for foreign SSID */ |
824 | return; | |
825 | } | |
826 | ||
827 | /* Reply with ProbeResp */ | |
40b275b6 | 828 | skb = skb_copy(presp, GFP_KERNEL); |
46900298 JB |
829 | if (!skb) |
830 | return; | |
831 | ||
832 | resp = (struct ieee80211_mgmt *) skb->data; | |
833 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
499f42bb | 834 | ibss_vdbg("%s: Sending ProbeResp to %pM\n", sdata->name, resp->da); |
62ae67be JB |
835 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
836 | ieee80211_tx_skb(sdata, skb); | |
46900298 JB |
837 | } |
838 | ||
839 | static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, | |
840 | struct ieee80211_mgmt *mgmt, | |
841 | size_t len, | |
842 | struct ieee80211_rx_status *rx_status) | |
843 | { | |
844 | size_t baselen; | |
845 | struct ieee802_11_elems elems; | |
846 | ||
46900298 JB |
847 | baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; |
848 | if (baselen > len) | |
849 | return; | |
850 | ||
851 | ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, | |
852 | &elems); | |
853 | ||
854 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); | |
855 | } | |
856 | ||
857 | static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, | |
858 | struct ieee80211_mgmt *mgmt, | |
859 | size_t len, | |
860 | struct ieee80211_rx_status *rx_status) | |
861 | { | |
862 | size_t baselen; | |
863 | struct ieee802_11_elems elems; | |
864 | ||
865 | /* Process beacon from the current BSS */ | |
866 | baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; | |
867 | if (baselen > len) | |
868 | return; | |
869 | ||
870 | ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems); | |
871 | ||
872 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true); | |
873 | } | |
874 | ||
1fa57d01 JB |
875 | void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, |
876 | struct sk_buff *skb) | |
46900298 JB |
877 | { |
878 | struct ieee80211_rx_status *rx_status; | |
879 | struct ieee80211_mgmt *mgmt; | |
880 | u16 fc; | |
881 | ||
f1d58c25 | 882 | rx_status = IEEE80211_SKB_RXCB(skb); |
46900298 JB |
883 | mgmt = (struct ieee80211_mgmt *) skb->data; |
884 | fc = le16_to_cpu(mgmt->frame_control); | |
885 | ||
7a17a33c JB |
886 | mutex_lock(&sdata->u.ibss.mtx); |
887 | ||
c926d006 TH |
888 | if (!sdata->u.ibss.ssid_len) |
889 | goto mgmt_out; /* not ready to merge yet */ | |
890 | ||
46900298 JB |
891 | switch (fc & IEEE80211_FCTL_STYPE) { |
892 | case IEEE80211_STYPE_PROBE_REQ: | |
c269a203 | 893 | ieee80211_rx_mgmt_probe_req(sdata, skb); |
46900298 JB |
894 | break; |
895 | case IEEE80211_STYPE_PROBE_RESP: | |
896 | ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, | |
897 | rx_status); | |
898 | break; | |
899 | case IEEE80211_STYPE_BEACON: | |
900 | ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, | |
901 | rx_status); | |
902 | break; | |
903 | case IEEE80211_STYPE_AUTH: | |
904 | ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); | |
905 | break; | |
906 | } | |
7a17a33c | 907 | |
c926d006 | 908 | mgmt_out: |
7a17a33c | 909 | mutex_unlock(&sdata->u.ibss.mtx); |
46900298 JB |
910 | } |
911 | ||
1fa57d01 | 912 | void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) |
46900298 | 913 | { |
1fa57d01 | 914 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
8bf11d8d | 915 | struct sta_info *sta; |
46900298 | 916 | |
7a17a33c JB |
917 | mutex_lock(&ifibss->mtx); |
918 | ||
919 | /* | |
920 | * Work could be scheduled after scan or similar | |
921 | * when we aren't even joined (or trying) with a | |
922 | * network. | |
923 | */ | |
924 | if (!ifibss->ssid_len) | |
925 | goto out; | |
46900298 | 926 | |
8bf11d8d JB |
927 | spin_lock_bh(&ifibss->incomplete_lock); |
928 | while (!list_empty(&ifibss->incomplete_stations)) { | |
929 | sta = list_first_entry(&ifibss->incomplete_stations, | |
930 | struct sta_info, list); | |
931 | list_del(&sta->list); | |
932 | spin_unlock_bh(&ifibss->incomplete_lock); | |
933 | ||
6d810f10 | 934 | ieee80211_ibss_finish_sta(sta, true); |
8bf11d8d JB |
935 | rcu_read_unlock(); |
936 | spin_lock_bh(&ifibss->incomplete_lock); | |
937 | } | |
938 | spin_unlock_bh(&ifibss->incomplete_lock); | |
939 | ||
46900298 JB |
940 | switch (ifibss->state) { |
941 | case IEEE80211_IBSS_MLME_SEARCH: | |
942 | ieee80211_sta_find_ibss(sdata); | |
943 | break; | |
944 | case IEEE80211_IBSS_MLME_JOINED: | |
945 | ieee80211_sta_merge_ibss(sdata); | |
946 | break; | |
947 | default: | |
948 | WARN_ON(1); | |
949 | break; | |
950 | } | |
46900298 | 951 | |
7a17a33c JB |
952 | out: |
953 | mutex_unlock(&ifibss->mtx); | |
3a4d4aa2 JB |
954 | } |
955 | ||
46900298 JB |
956 | static void ieee80211_ibss_timer(unsigned long data) |
957 | { | |
958 | struct ieee80211_sub_if_data *sdata = | |
959 | (struct ieee80211_sub_if_data *) data; | |
960 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
961 | struct ieee80211_local *local = sdata->local; | |
962 | ||
5bb644a0 JB |
963 | if (local->quiescing) { |
964 | ifibss->timer_running = true; | |
965 | return; | |
966 | } | |
967 | ||
7a17a33c | 968 | ieee80211_queue_work(&local->hw, &sdata->work); |
46900298 JB |
969 | } |
970 | ||
5bb644a0 JB |
971 | #ifdef CONFIG_PM |
972 | void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata) | |
973 | { | |
974 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
975 | ||
5bb644a0 JB |
976 | if (del_timer_sync(&ifibss->timer)) |
977 | ifibss->timer_running = true; | |
978 | } | |
979 | ||
980 | void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata) | |
981 | { | |
982 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
983 | ||
984 | if (ifibss->timer_running) { | |
985 | add_timer(&ifibss->timer); | |
986 | ifibss->timer_running = false; | |
987 | } | |
988 | } | |
989 | #endif | |
990 | ||
46900298 JB |
991 | void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) |
992 | { | |
993 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
994 | ||
46900298 JB |
995 | setup_timer(&ifibss->timer, ieee80211_ibss_timer, |
996 | (unsigned long) sdata); | |
7a17a33c | 997 | mutex_init(&ifibss->mtx); |
8bf11d8d JB |
998 | INIT_LIST_HEAD(&ifibss->incomplete_stations); |
999 | spin_lock_init(&ifibss->incomplete_lock); | |
46900298 JB |
1000 | } |
1001 | ||
1002 | /* scan finished notification */ | |
1003 | void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) | |
1004 | { | |
af8cdcd8 | 1005 | struct ieee80211_sub_if_data *sdata; |
46900298 | 1006 | |
29b4a4f7 JB |
1007 | mutex_lock(&local->iflist_mtx); |
1008 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 1009 | if (!ieee80211_sdata_running(sdata)) |
0e41f715 | 1010 | continue; |
af8cdcd8 JB |
1011 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
1012 | continue; | |
1013 | sdata->u.ibss.last_scan_completed = jiffies; | |
7a17a33c | 1014 | ieee80211_queue_work(&local->hw, &sdata->work); |
46900298 | 1015 | } |
29b4a4f7 | 1016 | mutex_unlock(&local->iflist_mtx); |
46900298 JB |
1017 | } |
1018 | ||
af8cdcd8 JB |
1019 | int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, |
1020 | struct cfg80211_ibss_params *params) | |
1021 | { | |
1022 | struct sk_buff *skb; | |
ff3cc5f4 | 1023 | u32 changed = 0; |
af8cdcd8 | 1024 | |
7a17a33c | 1025 | skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + |
13c40c54 AS |
1026 | sizeof(struct ieee80211_hdr_3addr) + |
1027 | 12 /* struct ieee80211_mgmt.u.beacon */ + | |
1028 | 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ + | |
1029 | 2 + 8 /* max Supported Rates */ + | |
1030 | 3 /* max DS params */ + | |
1031 | 4 /* IBSS params */ + | |
1032 | 2 + (IEEE80211_MAX_SUPP_RATES - 8) + | |
1033 | 2 + sizeof(struct ieee80211_ht_cap) + | |
074d46d1 | 1034 | 2 + sizeof(struct ieee80211_ht_operation) + |
7a17a33c JB |
1035 | params->ie_len); |
1036 | if (!skb) | |
1037 | return -ENOMEM; | |
1038 | ||
1039 | mutex_lock(&sdata->u.ibss.mtx); | |
1040 | ||
af8cdcd8 JB |
1041 | if (params->bssid) { |
1042 | memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); | |
1043 | sdata->u.ibss.fixed_bssid = true; | |
1044 | } else | |
1045 | sdata->u.ibss.fixed_bssid = false; | |
1046 | ||
fffd0934 | 1047 | sdata->u.ibss.privacy = params->privacy; |
267335d6 | 1048 | sdata->u.ibss.control_port = params->control_port; |
fbd2c8dc | 1049 | sdata->u.ibss.basic_rates = params->basic_rates; |
dd5b4cc7 FF |
1050 | memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, |
1051 | sizeof(params->mcast_rate)); | |
fffd0934 | 1052 | |
57c4d7b4 JB |
1053 | sdata->vif.bss_conf.beacon_int = params->beacon_interval; |
1054 | ||
af8cdcd8 | 1055 | sdata->u.ibss.channel = params->channel; |
13c40c54 | 1056 | sdata->u.ibss.channel_type = params->channel_type; |
af8cdcd8 JB |
1057 | sdata->u.ibss.fixed_channel = params->channel_fixed; |
1058 | ||
adfba3c7 JB |
1059 | /* fix ourselves to that channel now already */ |
1060 | if (params->channel_fixed) { | |
1061 | sdata->local->oper_channel = params->channel; | |
13c40c54 | 1062 | if (!ieee80211_set_channel_type(sdata->local, sdata, |
fb03c5eb DC |
1063 | params->channel_type)) { |
1064 | mutex_unlock(&sdata->u.ibss.mtx); | |
cb71b8d8 | 1065 | kfree_skb(skb); |
13c40c54 | 1066 | return -EINVAL; |
fb03c5eb | 1067 | } |
adfba3c7 JB |
1068 | } |
1069 | ||
af8cdcd8 JB |
1070 | if (params->ie) { |
1071 | sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, | |
1072 | GFP_KERNEL); | |
1073 | if (sdata->u.ibss.ie) | |
1074 | sdata->u.ibss.ie_len = params->ie_len; | |
1075 | } | |
1076 | ||
af8cdcd8 JB |
1077 | sdata->u.ibss.skb = skb; |
1078 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; | |
1079 | sdata->u.ibss.ibss_join_req = jiffies; | |
1080 | ||
0e41f715 | 1081 | memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN); |
0e41f715 JB |
1082 | sdata->u.ibss.ssid_len = params->ssid_len; |
1083 | ||
7da7cc1d JB |
1084 | mutex_unlock(&sdata->u.ibss.mtx); |
1085 | ||
1086 | mutex_lock(&sdata->local->mtx); | |
5cff20e6 | 1087 | ieee80211_recalc_idle(sdata->local); |
7da7cc1d | 1088 | mutex_unlock(&sdata->local->mtx); |
5cff20e6 | 1089 | |
ff3cc5f4 SW |
1090 | /* |
1091 | * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is | |
1092 | * reserved, but an HT STA shall protect HT transmissions as though | |
1093 | * the HT Protection field were set to non-HT mixed mode. | |
1094 | * | |
1095 | * In an IBSS, the RIFS Mode field of the HT Operation element is | |
1096 | * also reserved, but an HT STA shall operate as though this field | |
1097 | * were set to 1. | |
1098 | */ | |
1099 | ||
1100 | sdata->vif.bss_conf.ht_operation_mode |= | |
1101 | IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | |
1102 | | IEEE80211_HT_PARAM_RIFS_MODE; | |
1103 | ||
1104 | changed |= BSS_CHANGED_HT; | |
1105 | ieee80211_bss_info_change_notify(sdata, changed); | |
1106 | ||
64592c8f | 1107 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
af8cdcd8 JB |
1108 | |
1109 | return 0; | |
1110 | } | |
1111 | ||
1112 | int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) | |
1113 | { | |
1114 | struct sk_buff *skb; | |
5ea096c0 TP |
1115 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
1116 | struct ieee80211_local *local = sdata->local; | |
1117 | struct cfg80211_bss *cbss; | |
1118 | u16 capability; | |
7a17a33c | 1119 | int active_ibss; |
8bf11d8d | 1120 | struct sta_info *sta; |
7a17a33c JB |
1121 | |
1122 | mutex_lock(&sdata->u.ibss.mtx); | |
5ea096c0 | 1123 | |
f3209bea JB |
1124 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; |
1125 | memset(sdata->u.ibss.bssid, 0, ETH_ALEN); | |
1126 | sdata->u.ibss.ssid_len = 0; | |
1127 | ||
5ea096c0 TP |
1128 | active_ibss = ieee80211_sta_active_ibss(sdata); |
1129 | ||
1130 | if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) { | |
1131 | capability = WLAN_CAPABILITY_IBSS; | |
1132 | ||
1133 | if (ifibss->privacy) | |
1134 | capability |= WLAN_CAPABILITY_PRIVACY; | |
1135 | ||
1136 | cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->channel, | |
1137 | ifibss->bssid, ifibss->ssid, | |
1138 | ifibss->ssid_len, WLAN_CAPABILITY_IBSS | | |
1139 | WLAN_CAPABILITY_PRIVACY, | |
1140 | capability); | |
1141 | ||
1142 | if (cbss) { | |
1143 | cfg80211_unlink_bss(local->hw.wiphy, cbss); | |
1144 | cfg80211_put_bss(cbss); | |
1145 | } | |
1146 | } | |
af8cdcd8 | 1147 | |
af8cdcd8 | 1148 | sta_info_flush(sdata->local, sdata); |
8bf11d8d JB |
1149 | |
1150 | spin_lock_bh(&ifibss->incomplete_lock); | |
1151 | while (!list_empty(&ifibss->incomplete_stations)) { | |
1152 | sta = list_first_entry(&ifibss->incomplete_stations, | |
1153 | struct sta_info, list); | |
1154 | list_del(&sta->list); | |
1155 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1156 | ||
1157 | sta_info_free(local, sta); | |
1158 | spin_lock_bh(&ifibss->incomplete_lock); | |
1159 | } | |
1160 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1161 | ||
86a2ea41 | 1162 | netif_carrier_off(sdata->dev); |
af8cdcd8 JB |
1163 | |
1164 | /* remove beacon */ | |
1165 | kfree(sdata->u.ibss.ie); | |
40b275b6 JB |
1166 | skb = rcu_dereference_protected(sdata->u.ibss.presp, |
1167 | lockdep_is_held(&sdata->u.ibss.mtx)); | |
a9b3cd7f | 1168 | RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); |
8fc214ba JB |
1169 | sdata->vif.bss_conf.ibss_joined = false; |
1170 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | | |
1171 | BSS_CHANGED_IBSS); | |
af8cdcd8 JB |
1172 | synchronize_rcu(); |
1173 | kfree_skb(skb); | |
1174 | ||
35f20c14 | 1175 | skb_queue_purge(&sdata->skb_queue); |
5cff20e6 | 1176 | |
bc05d19f | 1177 | del_timer_sync(&sdata->u.ibss.timer); |
7a17a33c JB |
1178 | |
1179 | mutex_unlock(&sdata->u.ibss.mtx); | |
bc05d19f | 1180 | |
7da7cc1d | 1181 | mutex_lock(&local->mtx); |
5cff20e6 | 1182 | ieee80211_recalc_idle(sdata->local); |
7da7cc1d | 1183 | mutex_unlock(&local->mtx); |
af8cdcd8 JB |
1184 | |
1185 | return 0; | |
1186 | } |