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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> | |
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 | |
888d04df | 69 | if (compare_ether_addr(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) + | |
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 | ||
83d5cc01 JB |
268 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); |
269 | sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); | |
267335d6 AQ |
270 | /* authorize the station only if the network is not RSN protected. If |
271 | * not wait for the userspace to authorize it */ | |
272 | if (!sta->sdata->u.ibss.control_port) | |
273 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); | |
8bf11d8d JB |
274 | |
275 | rate_control_rate_init(sta); | |
276 | ||
277 | /* If it fails, maybe we raced another insertion? */ | |
278 | if (sta_info_insert_rcu(sta)) | |
279 | return sta_info_get(sdata, addr); | |
6d810f10 | 280 | if (auth) { |
24dd0dd7 | 281 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
6d810f10 AQ |
282 | printk(KERN_DEBUG "TX Auth SA=%pM DA=%pM BSSID=%pM" |
283 | "(auth_transaction=1)\n", sdata->vif.addr, | |
284 | sdata->u.ibss.bssid, addr); | |
24dd0dd7 | 285 | #endif |
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) { | |
308 | if (net_ratelimit()) | |
309 | printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n", | |
310 | sdata->name, addr); | |
311 | rcu_read_lock(); | |
312 | return NULL; | |
313 | } | |
314 | ||
315 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { | |
316 | rcu_read_lock(); | |
317 | return NULL; | |
318 | } | |
319 | ||
320 | if (compare_ether_addr(bssid, sdata->u.ibss.bssid)) { | |
321 | rcu_read_lock(); | |
322 | return NULL; | |
323 | } | |
324 | ||
325 | sta = sta_info_alloc(sdata, addr, GFP_KERNEL); | |
326 | if (!sta) { | |
327 | rcu_read_lock(); | |
328 | return NULL; | |
329 | } | |
330 | ||
331 | sta->last_rx = jiffies; | |
332 | ||
333 | /* make sure mandatory rates are always added */ | |
334 | sta->sta.supp_rates[band] = supp_rates | | |
335 | ieee80211_mandatory_rates(local, band); | |
336 | ||
6d810f10 AQ |
337 | return ieee80211_ibss_finish_sta(sta, auth); |
338 | } | |
339 | ||
340 | static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, | |
341 | struct ieee80211_mgmt *mgmt, | |
342 | size_t len) | |
343 | { | |
344 | u16 auth_alg, auth_transaction; | |
345 | ||
346 | lockdep_assert_held(&sdata->u.ibss.mtx); | |
347 | ||
348 | if (len < 24 + 6) | |
349 | return; | |
350 | ||
351 | auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); | |
352 | auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); | |
353 | ||
354 | if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) | |
355 | return; | |
356 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
357 | printk(KERN_DEBUG "%s: RX Auth SA=%pM DA=%pM BSSID=%pM." | |
358 | "(auth_transaction=%d)\n", | |
359 | sdata->name, mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction); | |
360 | #endif | |
361 | sta_info_destroy_addr(sdata, mgmt->sa); | |
362 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 0, false); | |
363 | rcu_read_unlock(); | |
364 | ||
365 | /* | |
366 | * IEEE 802.11 standard does not require authentication in IBSS | |
367 | * networks and most implementations do not seem to use it. | |
368 | * However, try to reply to authentication attempts if someone | |
369 | * has actually implemented this. | |
370 | */ | |
371 | ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, NULL, 0, | |
372 | mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0); | |
8bf11d8d JB |
373 | } |
374 | ||
46900298 JB |
375 | static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, |
376 | struct ieee80211_mgmt *mgmt, | |
377 | size_t len, | |
378 | struct ieee80211_rx_status *rx_status, | |
379 | struct ieee802_11_elems *elems, | |
380 | bool beacon) | |
381 | { | |
382 | struct ieee80211_local *local = sdata->local; | |
383 | int freq; | |
0c1ad2ca | 384 | struct cfg80211_bss *cbss; |
46900298 JB |
385 | struct ieee80211_bss *bss; |
386 | struct sta_info *sta; | |
387 | struct ieee80211_channel *channel; | |
388 | u64 beacon_timestamp, rx_timestamp; | |
389 | u32 supp_rates = 0; | |
390 | enum ieee80211_band band = rx_status->band; | |
13c40c54 AS |
391 | struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; |
392 | bool rates_updated = false; | |
46900298 JB |
393 | |
394 | if (elems->ds_params && elems->ds_params_len == 1) | |
59eb21a6 BR |
395 | freq = ieee80211_channel_to_frequency(elems->ds_params[0], |
396 | band); | |
46900298 JB |
397 | else |
398 | freq = rx_status->freq; | |
399 | ||
400 | channel = ieee80211_get_channel(local->hw.wiphy, freq); | |
401 | ||
402 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
403 | return; | |
404 | ||
9eba6125 | 405 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC && |
888d04df | 406 | compare_ether_addr(mgmt->bssid, sdata->u.ibss.bssid) == 0) { |
46900298 JB |
407 | |
408 | rcu_read_lock(); | |
abe60632 | 409 | sta = sta_info_get(sdata, mgmt->sa); |
46900298 | 410 | |
9eba6125 BR |
411 | if (elems->supp_rates) { |
412 | supp_rates = ieee80211_sta_get_rates(local, elems, | |
413 | band); | |
414 | if (sta) { | |
415 | u32 prev_rates; | |
416 | ||
417 | prev_rates = sta->sta.supp_rates[band]; | |
418 | /* make sure mandatory rates are always added */ | |
419 | sta->sta.supp_rates[band] = supp_rates | | |
420 | ieee80211_mandatory_rates(local, band); | |
46900298 | 421 | |
9eba6125 | 422 | if (sta->sta.supp_rates[band] != prev_rates) { |
46900298 | 423 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
9eba6125 BR |
424 | printk(KERN_DEBUG |
425 | "%s: updated supp_rates set " | |
426 | "for %pM based on beacon" | |
427 | "/probe_resp (0x%x -> 0x%x)\n", | |
428 | sdata->name, sta->sta.addr, | |
429 | prev_rates, | |
430 | sta->sta.supp_rates[band]); | |
46900298 | 431 | #endif |
13c40c54 | 432 | rates_updated = true; |
9eba6125 | 433 | } |
8bf11d8d JB |
434 | } else { |
435 | rcu_read_unlock(); | |
9eba6125 | 436 | sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, |
6d810f10 | 437 | mgmt->sa, supp_rates, true); |
8bf11d8d | 438 | } |
34e89507 | 439 | } |
9eba6125 BR |
440 | |
441 | if (sta && elems->wmm_info) | |
c2c98fde | 442 | set_sta_flag(sta, WLAN_STA_WME); |
9eba6125 | 443 | |
13c40c54 AS |
444 | if (sta && elems->ht_info_elem && elems->ht_cap_elem && |
445 | sdata->u.ibss.channel_type != NL80211_CHAN_NO_HT) { | |
446 | /* we both use HT */ | |
447 | struct ieee80211_sta_ht_cap sta_ht_cap_new; | |
448 | enum nl80211_channel_type channel_type = | |
449 | ieee80211_ht_info_to_channel_type( | |
450 | elems->ht_info_elem); | |
451 | ||
452 | ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, | |
453 | elems->ht_cap_elem, | |
454 | &sta_ht_cap_new); | |
455 | ||
456 | /* | |
457 | * fall back to HT20 if we don't use or use | |
458 | * the other extension channel | |
459 | */ | |
460 | if ((channel_type == NL80211_CHAN_HT40MINUS || | |
461 | channel_type == NL80211_CHAN_HT40PLUS) && | |
462 | channel_type != sdata->u.ibss.channel_type) | |
463 | sta_ht_cap_new.cap &= | |
464 | ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; | |
465 | ||
466 | if (memcmp(&sta->sta.ht_cap, &sta_ht_cap_new, | |
467 | sizeof(sta_ht_cap_new))) { | |
468 | memcpy(&sta->sta.ht_cap, &sta_ht_cap_new, | |
469 | sizeof(sta_ht_cap_new)); | |
470 | rates_updated = true; | |
471 | } | |
472 | } | |
473 | ||
474 | if (sta && rates_updated) | |
475 | rate_control_rate_init(sta); | |
476 | ||
9eba6125 | 477 | rcu_read_unlock(); |
46900298 JB |
478 | } |
479 | ||
480 | bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, | |
481 | channel, beacon); | |
482 | if (!bss) | |
483 | return; | |
484 | ||
0c1ad2ca JB |
485 | cbss = container_of((void *)bss, struct cfg80211_bss, priv); |
486 | ||
46900298 | 487 | /* was just updated in ieee80211_bss_info_update */ |
0c1ad2ca | 488 | beacon_timestamp = cbss->tsf; |
46900298 JB |
489 | |
490 | /* check if we need to merge IBSS */ | |
491 | ||
46900298 | 492 | /* we use a fixed BSSID */ |
a98bfec2 | 493 | if (sdata->u.ibss.fixed_bssid) |
46900298 JB |
494 | goto put_bss; |
495 | ||
496 | /* not an IBSS */ | |
0c1ad2ca | 497 | if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) |
46900298 JB |
498 | goto put_bss; |
499 | ||
500 | /* different channel */ | |
0c1ad2ca | 501 | if (cbss->channel != local->oper_channel) |
46900298 JB |
502 | goto put_bss; |
503 | ||
504 | /* different SSID */ | |
505 | if (elems->ssid_len != sdata->u.ibss.ssid_len || | |
506 | memcmp(elems->ssid, sdata->u.ibss.ssid, | |
507 | sdata->u.ibss.ssid_len)) | |
508 | goto put_bss; | |
509 | ||
34e8f082 | 510 | /* same BSSID */ |
888d04df | 511 | if (compare_ether_addr(cbss->bssid, sdata->u.ibss.bssid) == 0) |
34e8f082 AF |
512 | goto put_bss; |
513 | ||
6ebacbb7 | 514 | if (rx_status->flag & RX_FLAG_MACTIME_MPDU) { |
46900298 JB |
515 | /* |
516 | * For correct IBSS merging we need mactime; since mactime is | |
517 | * defined as the time the first data symbol of the frame hits | |
518 | * the PHY, and the timestamp of the beacon is defined as "the | |
519 | * time that the data symbol containing the first bit of the | |
520 | * timestamp is transmitted to the PHY plus the transmitting | |
521 | * STA's delays through its local PHY from the MAC-PHY | |
522 | * interface to its interface with the WM" (802.11 11.1.2) | |
523 | * - equals the time this bit arrives at the receiver - we have | |
524 | * to take into account the offset between the two. | |
525 | * | |
526 | * E.g. at 1 MBit that means mactime is 192 usec earlier | |
527 | * (=24 bytes * 8 usecs/byte) than the beacon timestamp. | |
528 | */ | |
529 | int rate; | |
530 | ||
531 | if (rx_status->flag & RX_FLAG_HT) | |
532 | rate = 65; /* TODO: HT rates */ | |
533 | else | |
534 | rate = local->hw.wiphy->bands[band]-> | |
535 | bitrates[rx_status->rate_idx].bitrate; | |
536 | ||
537 | rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate); | |
24487981 JB |
538 | } else { |
539 | /* | |
540 | * second best option: get current TSF | |
541 | * (will return -1 if not supported) | |
542 | */ | |
37a41b4a | 543 | rx_timestamp = drv_get_tsf(local, sdata); |
24487981 | 544 | } |
46900298 JB |
545 | |
546 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
547 | printk(KERN_DEBUG "RX beacon SA=%pM BSSID=" | |
548 | "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", | |
549 | mgmt->sa, mgmt->bssid, | |
550 | (unsigned long long)rx_timestamp, | |
551 | (unsigned long long)beacon_timestamp, | |
552 | (unsigned long long)(rx_timestamp - beacon_timestamp), | |
553 | jiffies); | |
554 | #endif | |
555 | ||
556 | if (beacon_timestamp > rx_timestamp) { | |
557 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
558 | printk(KERN_DEBUG "%s: beacon TSF higher than " | |
559 | "local TSF - IBSS merge with BSSID %pM\n", | |
47846c9b | 560 | sdata->name, mgmt->bssid); |
46900298 JB |
561 | #endif |
562 | ieee80211_sta_join_ibss(sdata, bss); | |
09a08cff | 563 | supp_rates = ieee80211_sta_get_rates(local, elems, band); |
34e89507 | 564 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, |
6d810f10 | 565 | supp_rates, true); |
8bf11d8d | 566 | rcu_read_unlock(); |
46900298 JB |
567 | } |
568 | ||
569 | put_bss: | |
570 | ieee80211_rx_bss_put(local, bss); | |
571 | } | |
572 | ||
8bf11d8d JB |
573 | void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, |
574 | const u8 *bssid, const u8 *addr, | |
575 | u32 supp_rates) | |
46900298 | 576 | { |
2e10d330 | 577 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
46900298 JB |
578 | struct ieee80211_local *local = sdata->local; |
579 | struct sta_info *sta; | |
580 | int band = local->hw.conf.channel->band; | |
581 | ||
af8cdcd8 JB |
582 | /* |
583 | * XXX: Consider removing the least recently used entry and | |
584 | * allow new one to be added. | |
585 | */ | |
46900298 | 586 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { |
af8cdcd8 JB |
587 | if (net_ratelimit()) |
588 | printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n", | |
47846c9b | 589 | sdata->name, addr); |
8bf11d8d | 590 | return; |
46900298 JB |
591 | } |
592 | ||
2e10d330 | 593 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) |
8bf11d8d | 594 | return; |
2e10d330 | 595 | |
46900298 | 596 | if (compare_ether_addr(bssid, sdata->u.ibss.bssid)) |
8bf11d8d | 597 | return; |
46900298 | 598 | |
8bf11d8d | 599 | sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); |
46900298 | 600 | if (!sta) |
8bf11d8d | 601 | return; |
46900298 | 602 | |
c8716d9d | 603 | sta->last_rx = jiffies; |
d9a7ddb0 | 604 | |
46900298 JB |
605 | /* make sure mandatory rates are always added */ |
606 | sta->sta.supp_rates[band] = supp_rates | | |
607 | ieee80211_mandatory_rates(local, band); | |
608 | ||
8bf11d8d JB |
609 | spin_lock(&ifibss->incomplete_lock); |
610 | list_add(&sta->list, &ifibss->incomplete_stations); | |
611 | spin_unlock(&ifibss->incomplete_lock); | |
612 | ieee80211_queue_work(&local->hw, &sdata->work); | |
46900298 JB |
613 | } |
614 | ||
615 | static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) | |
616 | { | |
617 | struct ieee80211_local *local = sdata->local; | |
618 | int active = 0; | |
619 | struct sta_info *sta; | |
620 | ||
7a17a33c JB |
621 | lockdep_assert_held(&sdata->u.ibss.mtx); |
622 | ||
46900298 JB |
623 | rcu_read_lock(); |
624 | ||
625 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
626 | if (sta->sdata == sdata && | |
627 | time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL, | |
628 | jiffies)) { | |
629 | active++; | |
630 | break; | |
631 | } | |
632 | } | |
633 | ||
634 | rcu_read_unlock(); | |
635 | ||
636 | return active; | |
637 | } | |
638 | ||
ce9058ae BP |
639 | /* |
640 | * This function is called with state == IEEE80211_IBSS_MLME_JOINED | |
641 | */ | |
46900298 JB |
642 | |
643 | static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) | |
644 | { | |
645 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
646 | ||
7a17a33c JB |
647 | lockdep_assert_held(&ifibss->mtx); |
648 | ||
af8cdcd8 JB |
649 | mod_timer(&ifibss->timer, |
650 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 JB |
651 | |
652 | ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT); | |
af8cdcd8 | 653 | |
450aae3d S |
654 | if (time_before(jiffies, ifibss->last_scan_completed + |
655 | IEEE80211_IBSS_MERGE_INTERVAL)) | |
656 | return; | |
657 | ||
46900298 JB |
658 | if (ieee80211_sta_active_ibss(sdata)) |
659 | return; | |
660 | ||
c037b836 | 661 | if (ifibss->fixed_channel) |
46900298 JB |
662 | return; |
663 | ||
664 | printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other " | |
47846c9b | 665 | "IBSS networks with same SSID (merge)\n", sdata->name); |
46900298 | 666 | |
be4a4b6a | 667 | ieee80211_request_internal_scan(sdata, |
c037b836 | 668 | ifibss->ssid, ifibss->ssid_len, NULL); |
46900298 JB |
669 | } |
670 | ||
af8cdcd8 | 671 | static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
672 | { |
673 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
46900298 | 674 | u8 bssid[ETH_ALEN]; |
46900298 JB |
675 | u16 capability; |
676 | int i; | |
677 | ||
7a17a33c JB |
678 | lockdep_assert_held(&ifibss->mtx); |
679 | ||
af8cdcd8 | 680 | if (ifibss->fixed_bssid) { |
46900298 JB |
681 | memcpy(bssid, ifibss->bssid, ETH_ALEN); |
682 | } else { | |
683 | /* Generate random, not broadcast, locally administered BSSID. Mix in | |
684 | * own MAC address to make sure that devices that do not have proper | |
685 | * random number generator get different BSSID. */ | |
686 | get_random_bytes(bssid, ETH_ALEN); | |
687 | for (i = 0; i < ETH_ALEN; i++) | |
47846c9b | 688 | bssid[i] ^= sdata->vif.addr[i]; |
46900298 JB |
689 | bssid[0] &= ~0x01; |
690 | bssid[0] |= 0x02; | |
691 | } | |
692 | ||
693 | printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n", | |
47846c9b | 694 | sdata->name, bssid); |
46900298 | 695 | |
46900298 JB |
696 | capability = WLAN_CAPABILITY_IBSS; |
697 | ||
fffd0934 | 698 | if (ifibss->privacy) |
46900298 JB |
699 | capability |= WLAN_CAPABILITY_PRIVACY; |
700 | else | |
701 | sdata->drop_unencrypted = 0; | |
702 | ||
57c4d7b4 | 703 | __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, |
fbd2c8dc | 704 | ifibss->channel, ifibss->basic_rates, |
b59066a2 | 705 | capability, 0); |
46900298 JB |
706 | } |
707 | ||
ce9058ae BP |
708 | /* |
709 | * This function is called with state == IEEE80211_IBSS_MLME_SEARCH | |
710 | */ | |
711 | ||
af8cdcd8 | 712 | static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
713 | { |
714 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
715 | struct ieee80211_local *local = sdata->local; | |
0c1ad2ca | 716 | struct cfg80211_bss *cbss; |
af8cdcd8 | 717 | struct ieee80211_channel *chan = NULL; |
46900298 JB |
718 | const u8 *bssid = NULL; |
719 | int active_ibss; | |
e0d61887 | 720 | u16 capability; |
46900298 | 721 | |
7a17a33c JB |
722 | lockdep_assert_held(&ifibss->mtx); |
723 | ||
46900298 JB |
724 | active_ibss = ieee80211_sta_active_ibss(sdata); |
725 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
726 | printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n", | |
47846c9b | 727 | sdata->name, active_ibss); |
46900298 JB |
728 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
729 | ||
730 | if (active_ibss) | |
af8cdcd8 | 731 | return; |
46900298 | 732 | |
e0d61887 | 733 | capability = WLAN_CAPABILITY_IBSS; |
fffd0934 | 734 | if (ifibss->privacy) |
e0d61887 | 735 | capability |= WLAN_CAPABILITY_PRIVACY; |
af8cdcd8 JB |
736 | if (ifibss->fixed_bssid) |
737 | bssid = ifibss->bssid; | |
738 | if (ifibss->fixed_channel) | |
739 | chan = ifibss->channel; | |
740 | if (!is_zero_ether_addr(ifibss->bssid)) | |
46900298 | 741 | bssid = ifibss->bssid; |
0c1ad2ca JB |
742 | cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, |
743 | ifibss->ssid, ifibss->ssid_len, | |
744 | WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY, | |
745 | capability); | |
746 | ||
747 | if (cbss) { | |
748 | struct ieee80211_bss *bss; | |
46900298 | 749 | |
0c1ad2ca | 750 | bss = (void *)cbss->priv; |
46900298 | 751 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
46900298 | 752 | printk(KERN_DEBUG " sta_find_ibss: selected %pM current " |
0c1ad2ca | 753 | "%pM\n", cbss->bssid, ifibss->bssid); |
46900298 JB |
754 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
755 | ||
46900298 JB |
756 | printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM" |
757 | " based on configured SSID\n", | |
0c1ad2ca | 758 | sdata->name, cbss->bssid); |
46900298 | 759 | |
af8cdcd8 | 760 | ieee80211_sta_join_ibss(sdata, bss); |
46900298 | 761 | ieee80211_rx_bss_put(local, bss); |
af8cdcd8 | 762 | return; |
d419b9f0 | 763 | } |
46900298 JB |
764 | |
765 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
766 | printk(KERN_DEBUG " did not try to join ibss\n"); | |
767 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ | |
768 | ||
769 | /* Selected IBSS not found in current scan results - try to scan */ | |
ce9058ae | 770 | if (time_after(jiffies, ifibss->last_scan_completed + |
46900298 JB |
771 | IEEE80211_SCAN_INTERVAL)) { |
772 | printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to " | |
47846c9b | 773 | "join\n", sdata->name); |
46900298 | 774 | |
be4a4b6a JB |
775 | ieee80211_request_internal_scan(sdata, |
776 | ifibss->ssid, ifibss->ssid_len, | |
777 | ifibss->fixed_channel ? ifibss->channel : NULL); | |
ce9058ae | 778 | } else { |
46900298 JB |
779 | int interval = IEEE80211_SCAN_INTERVAL; |
780 | ||
781 | if (time_after(jiffies, ifibss->ibss_join_req + | |
782 | IEEE80211_IBSS_JOIN_TIMEOUT)) { | |
af8cdcd8 JB |
783 | if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) { |
784 | ieee80211_sta_create_ibss(sdata); | |
785 | return; | |
786 | } | |
46900298 | 787 | printk(KERN_DEBUG "%s: IBSS not allowed on" |
47846c9b | 788 | " %d MHz\n", sdata->name, |
46900298 JB |
789 | local->hw.conf.channel->center_freq); |
790 | ||
791 | /* No IBSS found - decrease scan interval and continue | |
792 | * scanning. */ | |
793 | interval = IEEE80211_SCAN_INTERVAL_SLOW; | |
794 | } | |
795 | ||
af8cdcd8 JB |
796 | mod_timer(&ifibss->timer, |
797 | round_jiffies(jiffies + interval)); | |
46900298 | 798 | } |
46900298 JB |
799 | } |
800 | ||
801 | static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, | |
c269a203 | 802 | struct sk_buff *req) |
46900298 | 803 | { |
c269a203 | 804 | struct ieee80211_mgmt *mgmt = (void *)req->data; |
46900298 JB |
805 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
806 | struct ieee80211_local *local = sdata->local; | |
c269a203 | 807 | int tx_last_beacon, len = req->len; |
46900298 JB |
808 | struct sk_buff *skb; |
809 | struct ieee80211_mgmt *resp; | |
40b275b6 | 810 | struct sk_buff *presp; |
46900298 JB |
811 | u8 *pos, *end; |
812 | ||
7a17a33c JB |
813 | lockdep_assert_held(&ifibss->mtx); |
814 | ||
40b275b6 JB |
815 | presp = rcu_dereference_protected(ifibss->presp, |
816 | lockdep_is_held(&ifibss->mtx)); | |
817 | ||
46900298 | 818 | if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || |
40b275b6 | 819 | len < 24 + 2 || !presp) |
46900298 JB |
820 | return; |
821 | ||
24487981 | 822 | tx_last_beacon = drv_tx_last_beacon(local); |
46900298 JB |
823 | |
824 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
825 | printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM" | |
826 | " (tx_last_beacon=%d)\n", | |
47846c9b | 827 | sdata->name, mgmt->sa, mgmt->da, |
46900298 JB |
828 | mgmt->bssid, tx_last_beacon); |
829 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ | |
830 | ||
1ed76487 | 831 | if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) |
46900298 JB |
832 | return; |
833 | ||
888d04df FF |
834 | if (compare_ether_addr(mgmt->bssid, ifibss->bssid) != 0 && |
835 | !is_broadcast_ether_addr(mgmt->bssid)) | |
46900298 JB |
836 | return; |
837 | ||
838 | end = ((u8 *) mgmt) + len; | |
839 | pos = mgmt->u.probe_req.variable; | |
840 | if (pos[0] != WLAN_EID_SSID || | |
841 | pos + 2 + pos[1] > end) { | |
842 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
843 | printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq " | |
844 | "from %pM\n", | |
47846c9b | 845 | sdata->name, mgmt->sa); |
46900298 JB |
846 | #endif |
847 | return; | |
848 | } | |
849 | if (pos[1] != 0 && | |
850 | (pos[1] != ifibss->ssid_len || | |
0da780c2 | 851 | memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { |
46900298 JB |
852 | /* Ignore ProbeReq for foreign SSID */ |
853 | return; | |
854 | } | |
855 | ||
856 | /* Reply with ProbeResp */ | |
40b275b6 | 857 | skb = skb_copy(presp, GFP_KERNEL); |
46900298 JB |
858 | if (!skb) |
859 | return; | |
860 | ||
861 | resp = (struct ieee80211_mgmt *) skb->data; | |
862 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
863 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
864 | printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n", | |
47846c9b | 865 | sdata->name, resp->da); |
46900298 | 866 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
62ae67be JB |
867 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
868 | ieee80211_tx_skb(sdata, skb); | |
46900298 JB |
869 | } |
870 | ||
871 | static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, | |
872 | struct ieee80211_mgmt *mgmt, | |
873 | size_t len, | |
874 | struct ieee80211_rx_status *rx_status) | |
875 | { | |
876 | size_t baselen; | |
877 | struct ieee802_11_elems elems; | |
878 | ||
46900298 JB |
879 | baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; |
880 | if (baselen > len) | |
881 | return; | |
882 | ||
883 | ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, | |
884 | &elems); | |
885 | ||
886 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); | |
887 | } | |
888 | ||
889 | static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, | |
890 | struct ieee80211_mgmt *mgmt, | |
891 | size_t len, | |
892 | struct ieee80211_rx_status *rx_status) | |
893 | { | |
894 | size_t baselen; | |
895 | struct ieee802_11_elems elems; | |
896 | ||
897 | /* Process beacon from the current BSS */ | |
898 | baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; | |
899 | if (baselen > len) | |
900 | return; | |
901 | ||
902 | ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems); | |
903 | ||
904 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true); | |
905 | } | |
906 | ||
1fa57d01 JB |
907 | void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, |
908 | struct sk_buff *skb) | |
46900298 JB |
909 | { |
910 | struct ieee80211_rx_status *rx_status; | |
911 | struct ieee80211_mgmt *mgmt; | |
912 | u16 fc; | |
913 | ||
f1d58c25 | 914 | rx_status = IEEE80211_SKB_RXCB(skb); |
46900298 JB |
915 | mgmt = (struct ieee80211_mgmt *) skb->data; |
916 | fc = le16_to_cpu(mgmt->frame_control); | |
917 | ||
7a17a33c JB |
918 | mutex_lock(&sdata->u.ibss.mtx); |
919 | ||
c926d006 TH |
920 | if (!sdata->u.ibss.ssid_len) |
921 | goto mgmt_out; /* not ready to merge yet */ | |
922 | ||
46900298 JB |
923 | switch (fc & IEEE80211_FCTL_STYPE) { |
924 | case IEEE80211_STYPE_PROBE_REQ: | |
c269a203 | 925 | ieee80211_rx_mgmt_probe_req(sdata, skb); |
46900298 JB |
926 | break; |
927 | case IEEE80211_STYPE_PROBE_RESP: | |
928 | ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, | |
929 | rx_status); | |
930 | break; | |
931 | case IEEE80211_STYPE_BEACON: | |
932 | ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, | |
933 | rx_status); | |
934 | break; | |
935 | case IEEE80211_STYPE_AUTH: | |
936 | ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); | |
937 | break; | |
938 | } | |
7a17a33c | 939 | |
c926d006 | 940 | mgmt_out: |
7a17a33c | 941 | mutex_unlock(&sdata->u.ibss.mtx); |
46900298 JB |
942 | } |
943 | ||
1fa57d01 | 944 | void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) |
46900298 | 945 | { |
1fa57d01 | 946 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
8bf11d8d | 947 | struct sta_info *sta; |
46900298 | 948 | |
7a17a33c JB |
949 | mutex_lock(&ifibss->mtx); |
950 | ||
951 | /* | |
952 | * Work could be scheduled after scan or similar | |
953 | * when we aren't even joined (or trying) with a | |
954 | * network. | |
955 | */ | |
956 | if (!ifibss->ssid_len) | |
957 | goto out; | |
46900298 | 958 | |
8bf11d8d JB |
959 | spin_lock_bh(&ifibss->incomplete_lock); |
960 | while (!list_empty(&ifibss->incomplete_stations)) { | |
961 | sta = list_first_entry(&ifibss->incomplete_stations, | |
962 | struct sta_info, list); | |
963 | list_del(&sta->list); | |
964 | spin_unlock_bh(&ifibss->incomplete_lock); | |
965 | ||
6d810f10 | 966 | ieee80211_ibss_finish_sta(sta, true); |
8bf11d8d JB |
967 | rcu_read_unlock(); |
968 | spin_lock_bh(&ifibss->incomplete_lock); | |
969 | } | |
970 | spin_unlock_bh(&ifibss->incomplete_lock); | |
971 | ||
46900298 JB |
972 | switch (ifibss->state) { |
973 | case IEEE80211_IBSS_MLME_SEARCH: | |
974 | ieee80211_sta_find_ibss(sdata); | |
975 | break; | |
976 | case IEEE80211_IBSS_MLME_JOINED: | |
977 | ieee80211_sta_merge_ibss(sdata); | |
978 | break; | |
979 | default: | |
980 | WARN_ON(1); | |
981 | break; | |
982 | } | |
46900298 | 983 | |
7a17a33c JB |
984 | out: |
985 | mutex_unlock(&ifibss->mtx); | |
3a4d4aa2 JB |
986 | } |
987 | ||
46900298 JB |
988 | static void ieee80211_ibss_timer(unsigned long data) |
989 | { | |
990 | struct ieee80211_sub_if_data *sdata = | |
991 | (struct ieee80211_sub_if_data *) data; | |
992 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
993 | struct ieee80211_local *local = sdata->local; | |
994 | ||
5bb644a0 JB |
995 | if (local->quiescing) { |
996 | ifibss->timer_running = true; | |
997 | return; | |
998 | } | |
999 | ||
7a17a33c | 1000 | ieee80211_queue_work(&local->hw, &sdata->work); |
46900298 JB |
1001 | } |
1002 | ||
5bb644a0 JB |
1003 | #ifdef CONFIG_PM |
1004 | void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata) | |
1005 | { | |
1006 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1007 | ||
5bb644a0 JB |
1008 | if (del_timer_sync(&ifibss->timer)) |
1009 | ifibss->timer_running = true; | |
1010 | } | |
1011 | ||
1012 | void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata) | |
1013 | { | |
1014 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1015 | ||
1016 | if (ifibss->timer_running) { | |
1017 | add_timer(&ifibss->timer); | |
1018 | ifibss->timer_running = false; | |
1019 | } | |
1020 | } | |
1021 | #endif | |
1022 | ||
46900298 JB |
1023 | void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) |
1024 | { | |
1025 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1026 | ||
46900298 JB |
1027 | setup_timer(&ifibss->timer, ieee80211_ibss_timer, |
1028 | (unsigned long) sdata); | |
7a17a33c | 1029 | mutex_init(&ifibss->mtx); |
8bf11d8d JB |
1030 | INIT_LIST_HEAD(&ifibss->incomplete_stations); |
1031 | spin_lock_init(&ifibss->incomplete_lock); | |
46900298 JB |
1032 | } |
1033 | ||
1034 | /* scan finished notification */ | |
1035 | void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) | |
1036 | { | |
af8cdcd8 | 1037 | struct ieee80211_sub_if_data *sdata; |
46900298 | 1038 | |
29b4a4f7 JB |
1039 | mutex_lock(&local->iflist_mtx); |
1040 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 1041 | if (!ieee80211_sdata_running(sdata)) |
0e41f715 | 1042 | continue; |
af8cdcd8 JB |
1043 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
1044 | continue; | |
1045 | sdata->u.ibss.last_scan_completed = jiffies; | |
7a17a33c | 1046 | ieee80211_queue_work(&local->hw, &sdata->work); |
46900298 | 1047 | } |
29b4a4f7 | 1048 | mutex_unlock(&local->iflist_mtx); |
46900298 JB |
1049 | } |
1050 | ||
af8cdcd8 JB |
1051 | int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, |
1052 | struct cfg80211_ibss_params *params) | |
1053 | { | |
1054 | struct sk_buff *skb; | |
ff3cc5f4 | 1055 | u32 changed = 0; |
af8cdcd8 | 1056 | |
7a17a33c | 1057 | skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + |
13c40c54 AS |
1058 | sizeof(struct ieee80211_hdr_3addr) + |
1059 | 12 /* struct ieee80211_mgmt.u.beacon */ + | |
1060 | 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ + | |
1061 | 2 + 8 /* max Supported Rates */ + | |
1062 | 3 /* max DS params */ + | |
1063 | 4 /* IBSS params */ + | |
1064 | 2 + (IEEE80211_MAX_SUPP_RATES - 8) + | |
1065 | 2 + sizeof(struct ieee80211_ht_cap) + | |
1066 | 2 + sizeof(struct ieee80211_ht_info) + | |
7a17a33c JB |
1067 | params->ie_len); |
1068 | if (!skb) | |
1069 | return -ENOMEM; | |
1070 | ||
1071 | mutex_lock(&sdata->u.ibss.mtx); | |
1072 | ||
af8cdcd8 JB |
1073 | if (params->bssid) { |
1074 | memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); | |
1075 | sdata->u.ibss.fixed_bssid = true; | |
1076 | } else | |
1077 | sdata->u.ibss.fixed_bssid = false; | |
1078 | ||
fffd0934 | 1079 | sdata->u.ibss.privacy = params->privacy; |
267335d6 | 1080 | sdata->u.ibss.control_port = params->control_port; |
fbd2c8dc | 1081 | sdata->u.ibss.basic_rates = params->basic_rates; |
dd5b4cc7 FF |
1082 | memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, |
1083 | sizeof(params->mcast_rate)); | |
fffd0934 | 1084 | |
57c4d7b4 JB |
1085 | sdata->vif.bss_conf.beacon_int = params->beacon_interval; |
1086 | ||
af8cdcd8 | 1087 | sdata->u.ibss.channel = params->channel; |
13c40c54 | 1088 | sdata->u.ibss.channel_type = params->channel_type; |
af8cdcd8 JB |
1089 | sdata->u.ibss.fixed_channel = params->channel_fixed; |
1090 | ||
adfba3c7 JB |
1091 | /* fix ourselves to that channel now already */ |
1092 | if (params->channel_fixed) { | |
1093 | sdata->local->oper_channel = params->channel; | |
13c40c54 | 1094 | if (!ieee80211_set_channel_type(sdata->local, sdata, |
fb03c5eb DC |
1095 | params->channel_type)) { |
1096 | mutex_unlock(&sdata->u.ibss.mtx); | |
cb71b8d8 | 1097 | kfree_skb(skb); |
13c40c54 | 1098 | return -EINVAL; |
fb03c5eb | 1099 | } |
adfba3c7 JB |
1100 | } |
1101 | ||
af8cdcd8 JB |
1102 | if (params->ie) { |
1103 | sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, | |
1104 | GFP_KERNEL); | |
1105 | if (sdata->u.ibss.ie) | |
1106 | sdata->u.ibss.ie_len = params->ie_len; | |
1107 | } | |
1108 | ||
af8cdcd8 JB |
1109 | sdata->u.ibss.skb = skb; |
1110 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; | |
1111 | sdata->u.ibss.ibss_join_req = jiffies; | |
1112 | ||
0e41f715 | 1113 | memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN); |
0e41f715 JB |
1114 | sdata->u.ibss.ssid_len = params->ssid_len; |
1115 | ||
7da7cc1d JB |
1116 | mutex_unlock(&sdata->u.ibss.mtx); |
1117 | ||
1118 | mutex_lock(&sdata->local->mtx); | |
5cff20e6 | 1119 | ieee80211_recalc_idle(sdata->local); |
7da7cc1d | 1120 | mutex_unlock(&sdata->local->mtx); |
5cff20e6 | 1121 | |
ff3cc5f4 SW |
1122 | /* |
1123 | * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is | |
1124 | * reserved, but an HT STA shall protect HT transmissions as though | |
1125 | * the HT Protection field were set to non-HT mixed mode. | |
1126 | * | |
1127 | * In an IBSS, the RIFS Mode field of the HT Operation element is | |
1128 | * also reserved, but an HT STA shall operate as though this field | |
1129 | * were set to 1. | |
1130 | */ | |
1131 | ||
1132 | sdata->vif.bss_conf.ht_operation_mode |= | |
1133 | IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | |
1134 | | IEEE80211_HT_PARAM_RIFS_MODE; | |
1135 | ||
1136 | changed |= BSS_CHANGED_HT; | |
1137 | ieee80211_bss_info_change_notify(sdata, changed); | |
1138 | ||
64592c8f | 1139 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
af8cdcd8 JB |
1140 | |
1141 | return 0; | |
1142 | } | |
1143 | ||
1144 | int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) | |
1145 | { | |
1146 | struct sk_buff *skb; | |
5ea096c0 TP |
1147 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
1148 | struct ieee80211_local *local = sdata->local; | |
1149 | struct cfg80211_bss *cbss; | |
1150 | u16 capability; | |
7a17a33c | 1151 | int active_ibss; |
8bf11d8d | 1152 | struct sta_info *sta; |
7a17a33c JB |
1153 | |
1154 | mutex_lock(&sdata->u.ibss.mtx); | |
5ea096c0 | 1155 | |
f3209bea JB |
1156 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; |
1157 | memset(sdata->u.ibss.bssid, 0, ETH_ALEN); | |
1158 | sdata->u.ibss.ssid_len = 0; | |
1159 | ||
5ea096c0 TP |
1160 | active_ibss = ieee80211_sta_active_ibss(sdata); |
1161 | ||
1162 | if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) { | |
1163 | capability = WLAN_CAPABILITY_IBSS; | |
1164 | ||
1165 | if (ifibss->privacy) | |
1166 | capability |= WLAN_CAPABILITY_PRIVACY; | |
1167 | ||
1168 | cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->channel, | |
1169 | ifibss->bssid, ifibss->ssid, | |
1170 | ifibss->ssid_len, WLAN_CAPABILITY_IBSS | | |
1171 | WLAN_CAPABILITY_PRIVACY, | |
1172 | capability); | |
1173 | ||
1174 | if (cbss) { | |
1175 | cfg80211_unlink_bss(local->hw.wiphy, cbss); | |
1176 | cfg80211_put_bss(cbss); | |
1177 | } | |
1178 | } | |
af8cdcd8 | 1179 | |
af8cdcd8 | 1180 | sta_info_flush(sdata->local, sdata); |
8bf11d8d JB |
1181 | |
1182 | spin_lock_bh(&ifibss->incomplete_lock); | |
1183 | while (!list_empty(&ifibss->incomplete_stations)) { | |
1184 | sta = list_first_entry(&ifibss->incomplete_stations, | |
1185 | struct sta_info, list); | |
1186 | list_del(&sta->list); | |
1187 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1188 | ||
1189 | sta_info_free(local, sta); | |
1190 | spin_lock_bh(&ifibss->incomplete_lock); | |
1191 | } | |
1192 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1193 | ||
86a2ea41 | 1194 | netif_carrier_off(sdata->dev); |
af8cdcd8 JB |
1195 | |
1196 | /* remove beacon */ | |
1197 | kfree(sdata->u.ibss.ie); | |
40b275b6 JB |
1198 | skb = rcu_dereference_protected(sdata->u.ibss.presp, |
1199 | lockdep_is_held(&sdata->u.ibss.mtx)); | |
a9b3cd7f | 1200 | RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); |
8fc214ba JB |
1201 | sdata->vif.bss_conf.ibss_joined = false; |
1202 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | | |
1203 | BSS_CHANGED_IBSS); | |
af8cdcd8 JB |
1204 | synchronize_rcu(); |
1205 | kfree_skb(skb); | |
1206 | ||
35f20c14 | 1207 | skb_queue_purge(&sdata->skb_queue); |
5cff20e6 | 1208 | |
bc05d19f | 1209 | del_timer_sync(&sdata->u.ibss.timer); |
7a17a33c JB |
1210 | |
1211 | mutex_unlock(&sdata->u.ibss.mtx); | |
bc05d19f | 1212 | |
7da7cc1d | 1213 | mutex_lock(&local->mtx); |
5cff20e6 | 1214 | ieee80211_recalc_idle(sdata->local); |
7da7cc1d | 1215 | mutex_unlock(&local->mtx); |
af8cdcd8 JB |
1216 | |
1217 | return 0; | |
1218 | } |