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Commit | Line | Data |
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46900298 JB |
1 | /* |
2 | * IBSS mode implementation | |
3 | * Copyright 2003-2008, Jouni Malinen <j@w1.fi> | |
4 | * Copyright 2004, Instant802 Networks, Inc. | |
5 | * Copyright 2005, Devicescape Software, Inc. | |
6 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
7 | * Copyright 2007, Michael Wu <flamingice@sourmilk.net> | |
8 | * Copyright 2009, Johannes Berg <johannes@sipsolutions.net> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
13 | */ | |
14 | ||
15 | #include <linux/delay.h> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
46900298 JB |
17 | #include <linux/if_ether.h> |
18 | #include <linux/skbuff.h> | |
19 | #include <linux/if_arp.h> | |
20 | #include <linux/etherdevice.h> | |
21 | #include <linux/rtnetlink.h> | |
22 | #include <net/mac80211.h> | |
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 | 84 | channel_type = ifibss->channel_type; |
d58e7e37 | 85 | if (!cfg80211_can_beacon_sec_chan(local->hw.wiphy, chan, channel_type)) |
13c40c54 AS |
86 | channel_type = NL80211_CHAN_HT20; |
87 | if (!ieee80211_set_channel_type(local, sdata, channel_type)) { | |
88 | /* can only fail due to HT40+/- mismatch */ | |
89 | channel_type = NL80211_CHAN_HT20; | |
90 | WARN_ON(!ieee80211_set_channel_type(local, sdata, | |
91 | NL80211_CHAN_HT20)); | |
92 | } | |
af8cdcd8 | 93 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); |
57c4d7b4 | 94 | |
af8cdcd8 | 95 | sband = local->hw.wiphy->bands[chan->band]; |
46900298 | 96 | |
b59066a2 JB |
97 | /* build supported rates array */ |
98 | pos = supp_rates; | |
99 | for (i = 0; i < sband->n_bitrates; i++) { | |
100 | int rate = sband->bitrates[i].bitrate; | |
101 | u8 basic = 0; | |
102 | if (basic_rates & BIT(i)) | |
103 | basic = 0x80; | |
104 | *pos++ = basic | (u8) (rate / 5); | |
105 | } | |
106 | ||
46900298 | 107 | /* Build IBSS probe response */ |
af8cdcd8 | 108 | mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon)); |
46900298 JB |
109 | memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon)); |
110 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | | |
111 | IEEE80211_STYPE_PROBE_RESP); | |
e83e6541 | 112 | eth_broadcast_addr(mgmt->da); |
47846c9b | 113 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
46900298 | 114 | memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN); |
57c4d7b4 | 115 | mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int); |
707c1b4e | 116 | mgmt->u.beacon.timestamp = cpu_to_le64(tsf); |
46900298 JB |
117 | mgmt->u.beacon.capab_info = cpu_to_le16(capability); |
118 | ||
119 | pos = skb_put(skb, 2 + ifibss->ssid_len); | |
120 | *pos++ = WLAN_EID_SSID; | |
121 | *pos++ = ifibss->ssid_len; | |
122 | memcpy(pos, ifibss->ssid, ifibss->ssid_len); | |
123 | ||
b59066a2 | 124 | rates = sband->n_bitrates; |
46900298 JB |
125 | if (rates > 8) |
126 | rates = 8; | |
127 | pos = skb_put(skb, 2 + rates); | |
128 | *pos++ = WLAN_EID_SUPP_RATES; | |
129 | *pos++ = rates; | |
130 | memcpy(pos, supp_rates, rates); | |
131 | ||
132 | if (sband->band == IEEE80211_BAND_2GHZ) { | |
133 | pos = skb_put(skb, 2 + 1); | |
134 | *pos++ = WLAN_EID_DS_PARAMS; | |
135 | *pos++ = 1; | |
af8cdcd8 | 136 | *pos++ = ieee80211_frequency_to_channel(chan->center_freq); |
46900298 JB |
137 | } |
138 | ||
139 | pos = skb_put(skb, 2 + 2); | |
140 | *pos++ = WLAN_EID_IBSS_PARAMS; | |
141 | *pos++ = 2; | |
142 | /* FIX: set ATIM window based on scan results */ | |
143 | *pos++ = 0; | |
144 | *pos++ = 0; | |
145 | ||
b59066a2 JB |
146 | if (sband->n_bitrates > 8) { |
147 | rates = sband->n_bitrates - 8; | |
46900298 JB |
148 | pos = skb_put(skb, 2 + rates); |
149 | *pos++ = WLAN_EID_EXT_SUPP_RATES; | |
150 | *pos++ = rates; | |
151 | memcpy(pos, &supp_rates[8], rates); | |
152 | } | |
153 | ||
af8cdcd8 JB |
154 | if (ifibss->ie_len) |
155 | memcpy(skb_put(skb, ifibss->ie_len), | |
156 | ifibss->ie, ifibss->ie_len); | |
157 | ||
13c40c54 AS |
158 | /* add HT capability and information IEs */ |
159 | if (channel_type && sband->ht_cap.ht_supported) { | |
160 | pos = skb_put(skb, 4 + | |
161 | sizeof(struct ieee80211_ht_cap) + | |
074d46d1 | 162 | sizeof(struct ieee80211_ht_operation)); |
13c40c54 AS |
163 | pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, |
164 | sband->ht_cap.cap); | |
0d894ec5 AN |
165 | /* |
166 | * Note: According to 802.11n-2009 9.13.3.1, HT Protection | |
167 | * field and RIFS Mode are reserved in IBSS mode, therefore | |
168 | * keep them at 0 | |
169 | */ | |
074d46d1 | 170 | pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap, |
431e3154 | 171 | chan, channel_type, 0); |
13c40c54 AS |
172 | } |
173 | ||
32c5057b | 174 | if (local->hw.queues >= IEEE80211_NUM_ACS) { |
9eba6125 BR |
175 | pos = skb_put(skb, 9); |
176 | *pos++ = WLAN_EID_VENDOR_SPECIFIC; | |
177 | *pos++ = 7; /* len */ | |
178 | *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */ | |
179 | *pos++ = 0x50; | |
180 | *pos++ = 0xf2; | |
181 | *pos++ = 2; /* WME */ | |
182 | *pos++ = 0; /* WME info */ | |
183 | *pos++ = 1; /* WME ver */ | |
184 | *pos++ = 0; /* U-APSD no in use */ | |
185 | } | |
186 | ||
cf778b00 | 187 | rcu_assign_pointer(ifibss->presp, skb); |
46900298 | 188 | |
2d0ddec5 | 189 | sdata->vif.bss_conf.beacon_int = beacon_int; |
fbd2c8dc | 190 | sdata->vif.bss_conf.basic_rates = basic_rates; |
2d0ddec5 JB |
191 | bss_change = BSS_CHANGED_BEACON_INT; |
192 | bss_change |= ieee80211_reset_erp_info(sdata); | |
193 | bss_change |= BSS_CHANGED_BSSID; | |
194 | bss_change |= BSS_CHANGED_BEACON; | |
195 | bss_change |= BSS_CHANGED_BEACON_ENABLED; | |
392cfdb1 | 196 | bss_change |= BSS_CHANGED_BASIC_RATES; |
13c40c54 | 197 | bss_change |= BSS_CHANGED_HT; |
8fc214ba JB |
198 | bss_change |= BSS_CHANGED_IBSS; |
199 | sdata->vif.bss_conf.ibss_joined = true; | |
2d0ddec5 | 200 | ieee80211_bss_info_change_notify(sdata, bss_change); |
46900298 | 201 | |
b59066a2 | 202 | ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates); |
46900298 | 203 | |
46900298 | 204 | ifibss->state = IEEE80211_IBSS_MLME_JOINED; |
af8cdcd8 JB |
205 | mod_timer(&ifibss->timer, |
206 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 | 207 | |
273686d6 | 208 | bss = cfg80211_inform_bss_frame(local->hw.wiphy, chan, |
f446d10f JB |
209 | mgmt, skb->len, 0, GFP_KERNEL); |
210 | cfg80211_put_bss(bss); | |
86a2ea41 | 211 | netif_carrier_on(sdata->dev); |
af8cdcd8 | 212 | cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL); |
46900298 JB |
213 | } |
214 | ||
af8cdcd8 JB |
215 | static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
216 | struct ieee80211_bss *bss) | |
46900298 | 217 | { |
0c1ad2ca JB |
218 | struct cfg80211_bss *cbss = |
219 | container_of((void *)bss, struct cfg80211_bss, priv); | |
b59066a2 JB |
220 | struct ieee80211_supported_band *sband; |
221 | u32 basic_rates; | |
222 | int i, j; | |
0c1ad2ca | 223 | u16 beacon_int = cbss->beacon_interval; |
57c4d7b4 | 224 | |
7a17a33c JB |
225 | lockdep_assert_held(&sdata->u.ibss.mtx); |
226 | ||
57c4d7b4 JB |
227 | if (beacon_int < 10) |
228 | beacon_int = 10; | |
229 | ||
0c1ad2ca | 230 | sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; |
b59066a2 JB |
231 | |
232 | basic_rates = 0; | |
233 | ||
234 | for (i = 0; i < bss->supp_rates_len; i++) { | |
235 | int rate = (bss->supp_rates[i] & 0x7f) * 5; | |
236 | bool is_basic = !!(bss->supp_rates[i] & 0x80); | |
237 | ||
238 | for (j = 0; j < sband->n_bitrates; j++) { | |
239 | if (sband->bitrates[j].bitrate == rate) { | |
240 | if (is_basic) | |
241 | basic_rates |= BIT(j); | |
242 | break; | |
243 | } | |
244 | } | |
245 | } | |
246 | ||
0c1ad2ca | 247 | __ieee80211_sta_join_ibss(sdata, cbss->bssid, |
57c4d7b4 | 248 | beacon_int, |
0c1ad2ca | 249 | cbss->channel, |
b59066a2 | 250 | basic_rates, |
0c1ad2ca JB |
251 | cbss->capability, |
252 | cbss->tsf); | |
46900298 JB |
253 | } |
254 | ||
6d810f10 AQ |
255 | static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta, |
256 | bool auth) | |
8bf11d8d JB |
257 | __acquires(RCU) |
258 | { | |
259 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
260 | u8 addr[ETH_ALEN]; | |
261 | ||
262 | memcpy(addr, sta->sta.addr, ETH_ALEN); | |
263 | ||
bdcbd8e0 | 264 | ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr); |
8bf11d8d | 265 | |
83d5cc01 JB |
266 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); |
267 | sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); | |
267335d6 AQ |
268 | /* authorize the station only if the network is not RSN protected. If |
269 | * not wait for the userspace to authorize it */ | |
270 | if (!sta->sdata->u.ibss.control_port) | |
271 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); | |
8bf11d8d JB |
272 | |
273 | rate_control_rate_init(sta); | |
274 | ||
275 | /* If it fails, maybe we raced another insertion? */ | |
276 | if (sta_info_insert_rcu(sta)) | |
277 | return sta_info_get(sdata, addr); | |
452a6d22 | 278 | if (auth && !sdata->u.ibss.auth_frame_registrations) { |
bdcbd8e0 JB |
279 | ibss_dbg(sdata, |
280 | "TX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=1)\n", | |
2514ec86 | 281 | sdata->vif.addr, addr, sdata->u.ibss.bssid); |
6d810f10 AQ |
282 | ieee80211_send_auth(sdata, 1, WLAN_AUTH_OPEN, NULL, 0, |
283 | addr, sdata->u.ibss.bssid, NULL, 0, 0); | |
284 | } | |
8bf11d8d JB |
285 | return sta; |
286 | } | |
287 | ||
288 | static struct sta_info * | |
289 | ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, | |
290 | const u8 *bssid, const u8 *addr, | |
6d810f10 | 291 | u32 supp_rates, bool auth) |
8bf11d8d JB |
292 | __acquires(RCU) |
293 | { | |
294 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
295 | struct ieee80211_local *local = sdata->local; | |
296 | struct sta_info *sta; | |
273686d6 | 297 | int band = local->oper_channel->band; |
8bf11d8d JB |
298 | |
299 | /* | |
300 | * XXX: Consider removing the least recently used entry and | |
301 | * allow new one to be added. | |
302 | */ | |
303 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { | |
bdcbd8e0 | 304 | net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
e87cc472 | 305 | sdata->name, addr); |
8bf11d8d JB |
306 | rcu_read_lock(); |
307 | return NULL; | |
308 | } | |
309 | ||
310 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { | |
311 | rcu_read_lock(); | |
312 | return NULL; | |
313 | } | |
314 | ||
b203ca39 | 315 | if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) { |
8bf11d8d JB |
316 | rcu_read_lock(); |
317 | return NULL; | |
318 | } | |
319 | ||
320 | sta = sta_info_alloc(sdata, addr, GFP_KERNEL); | |
321 | if (!sta) { | |
322 | rcu_read_lock(); | |
323 | return NULL; | |
324 | } | |
325 | ||
326 | sta->last_rx = jiffies; | |
327 | ||
328 | /* make sure mandatory rates are always added */ | |
329 | sta->sta.supp_rates[band] = supp_rates | | |
330 | ieee80211_mandatory_rates(local, band); | |
331 | ||
6d810f10 AQ |
332 | return ieee80211_ibss_finish_sta(sta, auth); |
333 | } | |
334 | ||
2cc59e78 AQ |
335 | static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata, |
336 | struct ieee80211_mgmt *mgmt, | |
337 | size_t len) | |
338 | { | |
339 | u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code); | |
340 | ||
341 | if (len < IEEE80211_DEAUTH_FRAME_LEN) | |
342 | return; | |
343 | ||
344 | ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n", | |
345 | mgmt->sa, mgmt->da, mgmt->bssid, reason); | |
346 | sta_info_destroy_addr(sdata, mgmt->sa); | |
347 | } | |
348 | ||
6d810f10 AQ |
349 | static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, |
350 | struct ieee80211_mgmt *mgmt, | |
351 | size_t len) | |
352 | { | |
353 | u16 auth_alg, auth_transaction; | |
2cc59e78 AQ |
354 | struct sta_info *sta; |
355 | u8 deauth_frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; | |
6d810f10 AQ |
356 | |
357 | lockdep_assert_held(&sdata->u.ibss.mtx); | |
358 | ||
359 | if (len < 24 + 6) | |
360 | return; | |
361 | ||
362 | auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); | |
363 | auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); | |
364 | ||
365 | if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) | |
366 | return; | |
bdcbd8e0 JB |
367 | ibss_dbg(sdata, |
368 | "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n", | |
369 | mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction); | |
6d810f10 | 370 | sta_info_destroy_addr(sdata, mgmt->sa); |
2cc59e78 | 371 | sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 0, false); |
6d810f10 AQ |
372 | rcu_read_unlock(); |
373 | ||
2cc59e78 AQ |
374 | /* |
375 | * if we have any problem in allocating the new station, we reply with a | |
376 | * DEAUTH frame to tell the other end that we had a problem | |
377 | */ | |
378 | if (!sta) { | |
379 | ieee80211_send_deauth_disassoc(sdata, sdata->u.ibss.bssid, | |
380 | IEEE80211_STYPE_DEAUTH, | |
381 | WLAN_REASON_UNSPECIFIED, true, | |
382 | deauth_frame_buf); | |
383 | return; | |
384 | } | |
385 | ||
6d810f10 AQ |
386 | /* |
387 | * IEEE 802.11 standard does not require authentication in IBSS | |
388 | * networks and most implementations do not seem to use it. | |
389 | * However, try to reply to authentication attempts if someone | |
390 | * has actually implemented this. | |
391 | */ | |
392 | ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, NULL, 0, | |
393 | mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0); | |
8bf11d8d JB |
394 | } |
395 | ||
46900298 JB |
396 | static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, |
397 | struct ieee80211_mgmt *mgmt, | |
398 | size_t len, | |
399 | struct ieee80211_rx_status *rx_status, | |
400 | struct ieee802_11_elems *elems, | |
401 | bool beacon) | |
402 | { | |
403 | struct ieee80211_local *local = sdata->local; | |
404 | int freq; | |
0c1ad2ca | 405 | struct cfg80211_bss *cbss; |
46900298 JB |
406 | struct ieee80211_bss *bss; |
407 | struct sta_info *sta; | |
408 | struct ieee80211_channel *channel; | |
409 | u64 beacon_timestamp, rx_timestamp; | |
410 | u32 supp_rates = 0; | |
411 | enum ieee80211_band band = rx_status->band; | |
13c40c54 AS |
412 | struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; |
413 | bool rates_updated = false; | |
46900298 JB |
414 | |
415 | if (elems->ds_params && elems->ds_params_len == 1) | |
59eb21a6 BR |
416 | freq = ieee80211_channel_to_frequency(elems->ds_params[0], |
417 | band); | |
46900298 JB |
418 | else |
419 | freq = rx_status->freq; | |
420 | ||
421 | channel = ieee80211_get_channel(local->hw.wiphy, freq); | |
422 | ||
423 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
424 | return; | |
425 | ||
9eba6125 | 426 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC && |
b203ca39 | 427 | ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) { |
46900298 JB |
428 | |
429 | rcu_read_lock(); | |
abe60632 | 430 | sta = sta_info_get(sdata, mgmt->sa); |
46900298 | 431 | |
9eba6125 BR |
432 | if (elems->supp_rates) { |
433 | supp_rates = ieee80211_sta_get_rates(local, elems, | |
9ebb61a2 | 434 | band, NULL); |
9eba6125 BR |
435 | if (sta) { |
436 | u32 prev_rates; | |
437 | ||
438 | prev_rates = sta->sta.supp_rates[band]; | |
439 | /* make sure mandatory rates are always added */ | |
440 | sta->sta.supp_rates[band] = supp_rates | | |
441 | ieee80211_mandatory_rates(local, band); | |
46900298 | 442 | |
9eba6125 | 443 | if (sta->sta.supp_rates[band] != prev_rates) { |
bdcbd8e0 JB |
444 | ibss_dbg(sdata, |
445 | "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", | |
446 | sta->sta.addr, prev_rates, | |
447 | sta->sta.supp_rates[band]); | |
13c40c54 | 448 | rates_updated = true; |
9eba6125 | 449 | } |
8bf11d8d JB |
450 | } else { |
451 | rcu_read_unlock(); | |
9eba6125 | 452 | sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, |
6d810f10 | 453 | mgmt->sa, supp_rates, true); |
8bf11d8d | 454 | } |
34e89507 | 455 | } |
9eba6125 BR |
456 | |
457 | if (sta && elems->wmm_info) | |
c2c98fde | 458 | set_sta_flag(sta, WLAN_STA_WME); |
9eba6125 | 459 | |
074d46d1 | 460 | if (sta && elems->ht_operation && elems->ht_cap_elem && |
13c40c54 AS |
461 | sdata->u.ibss.channel_type != NL80211_CHAN_NO_HT) { |
462 | /* we both use HT */ | |
463 | struct ieee80211_sta_ht_cap sta_ht_cap_new; | |
464 | enum nl80211_channel_type channel_type = | |
074d46d1 JB |
465 | ieee80211_ht_oper_to_channel_type( |
466 | elems->ht_operation); | |
13c40c54 AS |
467 | |
468 | ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, | |
469 | elems->ht_cap_elem, | |
470 | &sta_ht_cap_new); | |
471 | ||
472 | /* | |
473 | * fall back to HT20 if we don't use or use | |
474 | * the other extension channel | |
475 | */ | |
6741e7f0 FF |
476 | if (!(channel_type == NL80211_CHAN_HT40MINUS || |
477 | channel_type == NL80211_CHAN_HT40PLUS) || | |
13c40c54 AS |
478 | channel_type != sdata->u.ibss.channel_type) |
479 | sta_ht_cap_new.cap &= | |
480 | ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; | |
481 | ||
482 | if (memcmp(&sta->sta.ht_cap, &sta_ht_cap_new, | |
483 | sizeof(sta_ht_cap_new))) { | |
484 | memcpy(&sta->sta.ht_cap, &sta_ht_cap_new, | |
485 | sizeof(sta_ht_cap_new)); | |
486 | rates_updated = true; | |
487 | } | |
488 | } | |
489 | ||
e687f61e AQ |
490 | if (sta && rates_updated) { |
491 | drv_sta_rc_update(local, sdata, &sta->sta, | |
492 | IEEE80211_RC_SUPP_RATES_CHANGED); | |
13c40c54 | 493 | rate_control_rate_init(sta); |
e687f61e | 494 | } |
13c40c54 | 495 | |
9eba6125 | 496 | rcu_read_unlock(); |
46900298 JB |
497 | } |
498 | ||
499 | bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, | |
500 | channel, beacon); | |
501 | if (!bss) | |
502 | return; | |
503 | ||
0c1ad2ca JB |
504 | cbss = container_of((void *)bss, struct cfg80211_bss, priv); |
505 | ||
46900298 | 506 | /* was just updated in ieee80211_bss_info_update */ |
0c1ad2ca | 507 | beacon_timestamp = cbss->tsf; |
46900298 JB |
508 | |
509 | /* check if we need to merge IBSS */ | |
510 | ||
46900298 | 511 | /* we use a fixed BSSID */ |
a98bfec2 | 512 | if (sdata->u.ibss.fixed_bssid) |
46900298 JB |
513 | goto put_bss; |
514 | ||
515 | /* not an IBSS */ | |
0c1ad2ca | 516 | if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) |
46900298 JB |
517 | goto put_bss; |
518 | ||
519 | /* different channel */ | |
0c1ad2ca | 520 | if (cbss->channel != local->oper_channel) |
46900298 JB |
521 | goto put_bss; |
522 | ||
523 | /* different SSID */ | |
524 | if (elems->ssid_len != sdata->u.ibss.ssid_len || | |
525 | memcmp(elems->ssid, sdata->u.ibss.ssid, | |
526 | sdata->u.ibss.ssid_len)) | |
527 | goto put_bss; | |
528 | ||
34e8f082 | 529 | /* same BSSID */ |
b203ca39 | 530 | if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) |
34e8f082 AF |
531 | goto put_bss; |
532 | ||
6ebacbb7 | 533 | if (rx_status->flag & RX_FLAG_MACTIME_MPDU) { |
46900298 JB |
534 | /* |
535 | * For correct IBSS merging we need mactime; since mactime is | |
536 | * defined as the time the first data symbol of the frame hits | |
537 | * the PHY, and the timestamp of the beacon is defined as "the | |
538 | * time that the data symbol containing the first bit of the | |
539 | * timestamp is transmitted to the PHY plus the transmitting | |
540 | * STA's delays through its local PHY from the MAC-PHY | |
541 | * interface to its interface with the WM" (802.11 11.1.2) | |
542 | * - equals the time this bit arrives at the receiver - we have | |
543 | * to take into account the offset between the two. | |
544 | * | |
545 | * E.g. at 1 MBit that means mactime is 192 usec earlier | |
546 | * (=24 bytes * 8 usecs/byte) than the beacon timestamp. | |
547 | */ | |
548 | int rate; | |
549 | ||
550 | if (rx_status->flag & RX_FLAG_HT) | |
551 | rate = 65; /* TODO: HT rates */ | |
552 | else | |
553 | rate = local->hw.wiphy->bands[band]-> | |
554 | bitrates[rx_status->rate_idx].bitrate; | |
555 | ||
556 | rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate); | |
24487981 JB |
557 | } else { |
558 | /* | |
559 | * second best option: get current TSF | |
560 | * (will return -1 if not supported) | |
561 | */ | |
37a41b4a | 562 | rx_timestamp = drv_get_tsf(local, sdata); |
24487981 | 563 | } |
46900298 | 564 | |
bdcbd8e0 JB |
565 | ibss_dbg(sdata, |
566 | "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", | |
567 | mgmt->sa, mgmt->bssid, | |
568 | (unsigned long long)rx_timestamp, | |
569 | (unsigned long long)beacon_timestamp, | |
570 | (unsigned long long)(rx_timestamp - beacon_timestamp), | |
571 | jiffies); | |
46900298 JB |
572 | |
573 | if (beacon_timestamp > rx_timestamp) { | |
bdcbd8e0 JB |
574 | ibss_dbg(sdata, |
575 | "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", | |
576 | mgmt->bssid); | |
46900298 | 577 | ieee80211_sta_join_ibss(sdata, bss); |
9ebb61a2 | 578 | supp_rates = ieee80211_sta_get_rates(local, elems, band, NULL); |
34e89507 | 579 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, |
6d810f10 | 580 | supp_rates, true); |
8bf11d8d | 581 | rcu_read_unlock(); |
46900298 JB |
582 | } |
583 | ||
584 | put_bss: | |
585 | ieee80211_rx_bss_put(local, bss); | |
586 | } | |
587 | ||
8bf11d8d JB |
588 | void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, |
589 | const u8 *bssid, const u8 *addr, | |
590 | u32 supp_rates) | |
46900298 | 591 | { |
2e10d330 | 592 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
46900298 JB |
593 | struct ieee80211_local *local = sdata->local; |
594 | struct sta_info *sta; | |
273686d6 | 595 | int band = local->oper_channel->band; |
46900298 | 596 | |
af8cdcd8 JB |
597 | /* |
598 | * XXX: Consider removing the least recently used entry and | |
599 | * allow new one to be added. | |
600 | */ | |
46900298 | 601 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { |
bdcbd8e0 | 602 | net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
e87cc472 | 603 | sdata->name, addr); |
8bf11d8d | 604 | return; |
46900298 JB |
605 | } |
606 | ||
2e10d330 | 607 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) |
8bf11d8d | 608 | return; |
2e10d330 | 609 | |
b203ca39 | 610 | if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) |
8bf11d8d | 611 | return; |
46900298 | 612 | |
8bf11d8d | 613 | sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); |
46900298 | 614 | if (!sta) |
8bf11d8d | 615 | return; |
46900298 | 616 | |
c8716d9d | 617 | sta->last_rx = jiffies; |
d9a7ddb0 | 618 | |
46900298 JB |
619 | /* make sure mandatory rates are always added */ |
620 | sta->sta.supp_rates[band] = supp_rates | | |
621 | ieee80211_mandatory_rates(local, band); | |
622 | ||
8bf11d8d JB |
623 | spin_lock(&ifibss->incomplete_lock); |
624 | list_add(&sta->list, &ifibss->incomplete_stations); | |
625 | spin_unlock(&ifibss->incomplete_lock); | |
626 | ieee80211_queue_work(&local->hw, &sdata->work); | |
46900298 JB |
627 | } |
628 | ||
629 | static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) | |
630 | { | |
631 | struct ieee80211_local *local = sdata->local; | |
632 | int active = 0; | |
633 | struct sta_info *sta; | |
634 | ||
7a17a33c JB |
635 | lockdep_assert_held(&sdata->u.ibss.mtx); |
636 | ||
46900298 JB |
637 | rcu_read_lock(); |
638 | ||
639 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
640 | if (sta->sdata == sdata && | |
641 | time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL, | |
642 | jiffies)) { | |
643 | active++; | |
644 | break; | |
645 | } | |
646 | } | |
647 | ||
648 | rcu_read_unlock(); | |
649 | ||
650 | return active; | |
651 | } | |
652 | ||
ce9058ae BP |
653 | /* |
654 | * This function is called with state == IEEE80211_IBSS_MLME_JOINED | |
655 | */ | |
46900298 JB |
656 | |
657 | static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) | |
658 | { | |
659 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
660 | ||
7a17a33c JB |
661 | lockdep_assert_held(&ifibss->mtx); |
662 | ||
af8cdcd8 JB |
663 | mod_timer(&ifibss->timer, |
664 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 JB |
665 | |
666 | ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT); | |
af8cdcd8 | 667 | |
450aae3d S |
668 | if (time_before(jiffies, ifibss->last_scan_completed + |
669 | IEEE80211_IBSS_MERGE_INTERVAL)) | |
670 | return; | |
671 | ||
46900298 JB |
672 | if (ieee80211_sta_active_ibss(sdata)) |
673 | return; | |
674 | ||
c037b836 | 675 | if (ifibss->fixed_channel) |
46900298 JB |
676 | return; |
677 | ||
bdcbd8e0 JB |
678 | sdata_info(sdata, |
679 | "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); | |
46900298 | 680 | |
be4a4b6a | 681 | ieee80211_request_internal_scan(sdata, |
c037b836 | 682 | ifibss->ssid, ifibss->ssid_len, NULL); |
46900298 JB |
683 | } |
684 | ||
af8cdcd8 | 685 | static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
686 | { |
687 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
46900298 | 688 | u8 bssid[ETH_ALEN]; |
46900298 JB |
689 | u16 capability; |
690 | int i; | |
691 | ||
7a17a33c JB |
692 | lockdep_assert_held(&ifibss->mtx); |
693 | ||
af8cdcd8 | 694 | if (ifibss->fixed_bssid) { |
46900298 JB |
695 | memcpy(bssid, ifibss->bssid, ETH_ALEN); |
696 | } else { | |
697 | /* Generate random, not broadcast, locally administered BSSID. Mix in | |
698 | * own MAC address to make sure that devices that do not have proper | |
699 | * random number generator get different BSSID. */ | |
700 | get_random_bytes(bssid, ETH_ALEN); | |
701 | for (i = 0; i < ETH_ALEN; i++) | |
47846c9b | 702 | bssid[i] ^= sdata->vif.addr[i]; |
46900298 JB |
703 | bssid[0] &= ~0x01; |
704 | bssid[0] |= 0x02; | |
705 | } | |
706 | ||
bdcbd8e0 | 707 | sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); |
46900298 | 708 | |
46900298 JB |
709 | capability = WLAN_CAPABILITY_IBSS; |
710 | ||
fffd0934 | 711 | if (ifibss->privacy) |
46900298 JB |
712 | capability |= WLAN_CAPABILITY_PRIVACY; |
713 | else | |
714 | sdata->drop_unencrypted = 0; | |
715 | ||
57c4d7b4 | 716 | __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, |
fbd2c8dc | 717 | ifibss->channel, ifibss->basic_rates, |
b59066a2 | 718 | capability, 0); |
46900298 JB |
719 | } |
720 | ||
ce9058ae BP |
721 | /* |
722 | * This function is called with state == IEEE80211_IBSS_MLME_SEARCH | |
723 | */ | |
724 | ||
af8cdcd8 | 725 | static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
726 | { |
727 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
728 | struct ieee80211_local *local = sdata->local; | |
0c1ad2ca | 729 | struct cfg80211_bss *cbss; |
af8cdcd8 | 730 | struct ieee80211_channel *chan = NULL; |
46900298 JB |
731 | const u8 *bssid = NULL; |
732 | int active_ibss; | |
e0d61887 | 733 | u16 capability; |
46900298 | 734 | |
7a17a33c JB |
735 | lockdep_assert_held(&ifibss->mtx); |
736 | ||
46900298 | 737 | active_ibss = ieee80211_sta_active_ibss(sdata); |
bdcbd8e0 | 738 | ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); |
46900298 JB |
739 | |
740 | if (active_ibss) | |
af8cdcd8 | 741 | return; |
46900298 | 742 | |
e0d61887 | 743 | capability = WLAN_CAPABILITY_IBSS; |
fffd0934 | 744 | if (ifibss->privacy) |
e0d61887 | 745 | capability |= WLAN_CAPABILITY_PRIVACY; |
af8cdcd8 JB |
746 | if (ifibss->fixed_bssid) |
747 | bssid = ifibss->bssid; | |
748 | if (ifibss->fixed_channel) | |
749 | chan = ifibss->channel; | |
750 | if (!is_zero_ether_addr(ifibss->bssid)) | |
46900298 | 751 | bssid = ifibss->bssid; |
0c1ad2ca JB |
752 | cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, |
753 | ifibss->ssid, ifibss->ssid_len, | |
754 | WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY, | |
755 | capability); | |
756 | ||
757 | if (cbss) { | |
758 | struct ieee80211_bss *bss; | |
46900298 | 759 | |
0c1ad2ca | 760 | bss = (void *)cbss->priv; |
bdcbd8e0 JB |
761 | ibss_dbg(sdata, |
762 | "sta_find_ibss: selected %pM current %pM\n", | |
763 | cbss->bssid, ifibss->bssid); | |
764 | sdata_info(sdata, | |
765 | "Selected IBSS BSSID %pM based on configured SSID\n", | |
766 | cbss->bssid); | |
46900298 | 767 | |
af8cdcd8 | 768 | ieee80211_sta_join_ibss(sdata, bss); |
46900298 | 769 | ieee80211_rx_bss_put(local, bss); |
af8cdcd8 | 770 | return; |
d419b9f0 | 771 | } |
46900298 | 772 | |
bdcbd8e0 | 773 | ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); |
46900298 JB |
774 | |
775 | /* Selected IBSS not found in current scan results - try to scan */ | |
ce9058ae | 776 | if (time_after(jiffies, ifibss->last_scan_completed + |
46900298 | 777 | IEEE80211_SCAN_INTERVAL)) { |
bdcbd8e0 | 778 | sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); |
46900298 | 779 | |
be4a4b6a JB |
780 | ieee80211_request_internal_scan(sdata, |
781 | ifibss->ssid, ifibss->ssid_len, | |
782 | ifibss->fixed_channel ? ifibss->channel : NULL); | |
ce9058ae | 783 | } else { |
46900298 JB |
784 | int interval = IEEE80211_SCAN_INTERVAL; |
785 | ||
786 | if (time_after(jiffies, ifibss->ibss_join_req + | |
787 | IEEE80211_IBSS_JOIN_TIMEOUT)) { | |
af8cdcd8 JB |
788 | if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) { |
789 | ieee80211_sta_create_ibss(sdata); | |
790 | return; | |
791 | } | |
bdcbd8e0 | 792 | sdata_info(sdata, "IBSS not allowed on %d MHz\n", |
273686d6 | 793 | local->oper_channel->center_freq); |
46900298 JB |
794 | |
795 | /* No IBSS found - decrease scan interval and continue | |
796 | * scanning. */ | |
797 | interval = IEEE80211_SCAN_INTERVAL_SLOW; | |
798 | } | |
799 | ||
af8cdcd8 JB |
800 | mod_timer(&ifibss->timer, |
801 | round_jiffies(jiffies + interval)); | |
46900298 | 802 | } |
46900298 JB |
803 | } |
804 | ||
805 | static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, | |
c269a203 | 806 | struct sk_buff *req) |
46900298 | 807 | { |
c269a203 | 808 | struct ieee80211_mgmt *mgmt = (void *)req->data; |
46900298 JB |
809 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
810 | struct ieee80211_local *local = sdata->local; | |
c269a203 | 811 | int tx_last_beacon, len = req->len; |
46900298 JB |
812 | struct sk_buff *skb; |
813 | struct ieee80211_mgmt *resp; | |
40b275b6 | 814 | struct sk_buff *presp; |
46900298 JB |
815 | u8 *pos, *end; |
816 | ||
7a17a33c JB |
817 | lockdep_assert_held(&ifibss->mtx); |
818 | ||
40b275b6 JB |
819 | presp = rcu_dereference_protected(ifibss->presp, |
820 | lockdep_is_held(&ifibss->mtx)); | |
821 | ||
46900298 | 822 | if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || |
40b275b6 | 823 | len < 24 + 2 || !presp) |
46900298 JB |
824 | return; |
825 | ||
24487981 | 826 | tx_last_beacon = drv_tx_last_beacon(local); |
46900298 | 827 | |
bdcbd8e0 JB |
828 | ibss_dbg(sdata, |
829 | "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n", | |
830 | mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon); | |
46900298 | 831 | |
1ed76487 | 832 | if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) |
46900298 JB |
833 | return; |
834 | ||
b203ca39 | 835 | if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && |
888d04df | 836 | !is_broadcast_ether_addr(mgmt->bssid)) |
46900298 JB |
837 | return; |
838 | ||
839 | end = ((u8 *) mgmt) + len; | |
840 | pos = mgmt->u.probe_req.variable; | |
841 | if (pos[0] != WLAN_EID_SSID || | |
842 | pos + 2 + pos[1] > end) { | |
bdcbd8e0 JB |
843 | ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", |
844 | mgmt->sa); | |
46900298 JB |
845 | return; |
846 | } | |
847 | if (pos[1] != 0 && | |
848 | (pos[1] != ifibss->ssid_len || | |
0da780c2 | 849 | memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { |
46900298 JB |
850 | /* Ignore ProbeReq for foreign SSID */ |
851 | return; | |
852 | } | |
853 | ||
854 | /* Reply with ProbeResp */ | |
40b275b6 | 855 | skb = skb_copy(presp, GFP_KERNEL); |
46900298 JB |
856 | if (!skb) |
857 | return; | |
858 | ||
859 | resp = (struct ieee80211_mgmt *) skb->data; | |
860 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
bdcbd8e0 | 861 | ibss_dbg(sdata, "Sending ProbeResp to %pM\n", resp->da); |
62ae67be JB |
862 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
863 | ieee80211_tx_skb(sdata, skb); | |
46900298 JB |
864 | } |
865 | ||
866 | static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, | |
867 | struct ieee80211_mgmt *mgmt, | |
868 | size_t len, | |
869 | struct ieee80211_rx_status *rx_status) | |
870 | { | |
871 | size_t baselen; | |
872 | struct ieee802_11_elems elems; | |
873 | ||
46900298 JB |
874 | baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; |
875 | if (baselen > len) | |
876 | return; | |
877 | ||
878 | ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, | |
879 | &elems); | |
880 | ||
881 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); | |
882 | } | |
883 | ||
884 | static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, | |
885 | struct ieee80211_mgmt *mgmt, | |
886 | size_t len, | |
887 | struct ieee80211_rx_status *rx_status) | |
888 | { | |
889 | size_t baselen; | |
890 | struct ieee802_11_elems elems; | |
891 | ||
892 | /* Process beacon from the current BSS */ | |
893 | baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; | |
894 | if (baselen > len) | |
895 | return; | |
896 | ||
897 | ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems); | |
898 | ||
899 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true); | |
900 | } | |
901 | ||
1fa57d01 JB |
902 | void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, |
903 | struct sk_buff *skb) | |
46900298 JB |
904 | { |
905 | struct ieee80211_rx_status *rx_status; | |
906 | struct ieee80211_mgmt *mgmt; | |
907 | u16 fc; | |
908 | ||
f1d58c25 | 909 | rx_status = IEEE80211_SKB_RXCB(skb); |
46900298 JB |
910 | mgmt = (struct ieee80211_mgmt *) skb->data; |
911 | fc = le16_to_cpu(mgmt->frame_control); | |
912 | ||
7a17a33c JB |
913 | mutex_lock(&sdata->u.ibss.mtx); |
914 | ||
c926d006 TH |
915 | if (!sdata->u.ibss.ssid_len) |
916 | goto mgmt_out; /* not ready to merge yet */ | |
917 | ||
46900298 JB |
918 | switch (fc & IEEE80211_FCTL_STYPE) { |
919 | case IEEE80211_STYPE_PROBE_REQ: | |
c269a203 | 920 | ieee80211_rx_mgmt_probe_req(sdata, skb); |
46900298 JB |
921 | break; |
922 | case IEEE80211_STYPE_PROBE_RESP: | |
923 | ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, | |
924 | rx_status); | |
925 | break; | |
926 | case IEEE80211_STYPE_BEACON: | |
927 | ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, | |
928 | rx_status); | |
929 | break; | |
930 | case IEEE80211_STYPE_AUTH: | |
931 | ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); | |
932 | break; | |
2cc59e78 AQ |
933 | case IEEE80211_STYPE_DEAUTH: |
934 | ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); | |
935 | break; | |
46900298 | 936 | } |
7a17a33c | 937 | |
c926d006 | 938 | mgmt_out: |
7a17a33c | 939 | mutex_unlock(&sdata->u.ibss.mtx); |
46900298 JB |
940 | } |
941 | ||
1fa57d01 | 942 | void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) |
46900298 | 943 | { |
1fa57d01 | 944 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
8bf11d8d | 945 | struct sta_info *sta; |
46900298 | 946 | |
7a17a33c JB |
947 | mutex_lock(&ifibss->mtx); |
948 | ||
949 | /* | |
950 | * Work could be scheduled after scan or similar | |
951 | * when we aren't even joined (or trying) with a | |
952 | * network. | |
953 | */ | |
954 | if (!ifibss->ssid_len) | |
955 | goto out; | |
46900298 | 956 | |
8bf11d8d JB |
957 | spin_lock_bh(&ifibss->incomplete_lock); |
958 | while (!list_empty(&ifibss->incomplete_stations)) { | |
959 | sta = list_first_entry(&ifibss->incomplete_stations, | |
960 | struct sta_info, list); | |
961 | list_del(&sta->list); | |
962 | spin_unlock_bh(&ifibss->incomplete_lock); | |
963 | ||
6d810f10 | 964 | ieee80211_ibss_finish_sta(sta, true); |
8bf11d8d JB |
965 | rcu_read_unlock(); |
966 | spin_lock_bh(&ifibss->incomplete_lock); | |
967 | } | |
968 | spin_unlock_bh(&ifibss->incomplete_lock); | |
969 | ||
46900298 JB |
970 | switch (ifibss->state) { |
971 | case IEEE80211_IBSS_MLME_SEARCH: | |
972 | ieee80211_sta_find_ibss(sdata); | |
973 | break; | |
974 | case IEEE80211_IBSS_MLME_JOINED: | |
975 | ieee80211_sta_merge_ibss(sdata); | |
976 | break; | |
977 | default: | |
978 | WARN_ON(1); | |
979 | break; | |
980 | } | |
46900298 | 981 | |
7a17a33c JB |
982 | out: |
983 | mutex_unlock(&ifibss->mtx); | |
3a4d4aa2 JB |
984 | } |
985 | ||
46900298 JB |
986 | static void ieee80211_ibss_timer(unsigned long data) |
987 | { | |
988 | struct ieee80211_sub_if_data *sdata = | |
989 | (struct ieee80211_sub_if_data *) data; | |
990 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
991 | struct ieee80211_local *local = sdata->local; | |
992 | ||
5bb644a0 JB |
993 | if (local->quiescing) { |
994 | ifibss->timer_running = true; | |
995 | return; | |
996 | } | |
997 | ||
7a17a33c | 998 | ieee80211_queue_work(&local->hw, &sdata->work); |
46900298 JB |
999 | } |
1000 | ||
5bb644a0 JB |
1001 | #ifdef CONFIG_PM |
1002 | void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata) | |
1003 | { | |
1004 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1005 | ||
5bb644a0 JB |
1006 | if (del_timer_sync(&ifibss->timer)) |
1007 | ifibss->timer_running = true; | |
1008 | } | |
1009 | ||
1010 | void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata) | |
1011 | { | |
1012 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1013 | ||
1014 | if (ifibss->timer_running) { | |
1015 | add_timer(&ifibss->timer); | |
1016 | ifibss->timer_running = false; | |
1017 | } | |
1018 | } | |
1019 | #endif | |
1020 | ||
46900298 JB |
1021 | void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) |
1022 | { | |
1023 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1024 | ||
46900298 JB |
1025 | setup_timer(&ifibss->timer, ieee80211_ibss_timer, |
1026 | (unsigned long) sdata); | |
7a17a33c | 1027 | mutex_init(&ifibss->mtx); |
8bf11d8d JB |
1028 | INIT_LIST_HEAD(&ifibss->incomplete_stations); |
1029 | spin_lock_init(&ifibss->incomplete_lock); | |
46900298 JB |
1030 | } |
1031 | ||
1032 | /* scan finished notification */ | |
1033 | void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) | |
1034 | { | |
af8cdcd8 | 1035 | struct ieee80211_sub_if_data *sdata; |
46900298 | 1036 | |
29b4a4f7 JB |
1037 | mutex_lock(&local->iflist_mtx); |
1038 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 1039 | if (!ieee80211_sdata_running(sdata)) |
0e41f715 | 1040 | continue; |
af8cdcd8 JB |
1041 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
1042 | continue; | |
1043 | sdata->u.ibss.last_scan_completed = jiffies; | |
7a17a33c | 1044 | ieee80211_queue_work(&local->hw, &sdata->work); |
46900298 | 1045 | } |
29b4a4f7 | 1046 | mutex_unlock(&local->iflist_mtx); |
46900298 JB |
1047 | } |
1048 | ||
af8cdcd8 JB |
1049 | int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, |
1050 | struct cfg80211_ibss_params *params) | |
1051 | { | |
1052 | struct sk_buff *skb; | |
ff3cc5f4 | 1053 | u32 changed = 0; |
af8cdcd8 | 1054 | |
7a17a33c | 1055 | skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + |
13c40c54 AS |
1056 | sizeof(struct ieee80211_hdr_3addr) + |
1057 | 12 /* struct ieee80211_mgmt.u.beacon */ + | |
1058 | 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ + | |
1059 | 2 + 8 /* max Supported Rates */ + | |
1060 | 3 /* max DS params */ + | |
1061 | 4 /* IBSS params */ + | |
1062 | 2 + (IEEE80211_MAX_SUPP_RATES - 8) + | |
1063 | 2 + sizeof(struct ieee80211_ht_cap) + | |
074d46d1 | 1064 | 2 + sizeof(struct ieee80211_ht_operation) + |
7a17a33c JB |
1065 | params->ie_len); |
1066 | if (!skb) | |
1067 | return -ENOMEM; | |
1068 | ||
1069 | mutex_lock(&sdata->u.ibss.mtx); | |
1070 | ||
af8cdcd8 JB |
1071 | if (params->bssid) { |
1072 | memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); | |
1073 | sdata->u.ibss.fixed_bssid = true; | |
1074 | } else | |
1075 | sdata->u.ibss.fixed_bssid = false; | |
1076 | ||
fffd0934 | 1077 | sdata->u.ibss.privacy = params->privacy; |
267335d6 | 1078 | sdata->u.ibss.control_port = params->control_port; |
fbd2c8dc | 1079 | sdata->u.ibss.basic_rates = params->basic_rates; |
dd5b4cc7 FF |
1080 | memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, |
1081 | sizeof(params->mcast_rate)); | |
fffd0934 | 1082 | |
57c4d7b4 JB |
1083 | sdata->vif.bss_conf.beacon_int = params->beacon_interval; |
1084 | ||
af8cdcd8 | 1085 | sdata->u.ibss.channel = params->channel; |
13c40c54 | 1086 | sdata->u.ibss.channel_type = params->channel_type; |
af8cdcd8 JB |
1087 | sdata->u.ibss.fixed_channel = params->channel_fixed; |
1088 | ||
adfba3c7 JB |
1089 | /* fix ourselves to that channel now already */ |
1090 | if (params->channel_fixed) { | |
1091 | sdata->local->oper_channel = params->channel; | |
13c40c54 | 1092 | if (!ieee80211_set_channel_type(sdata->local, sdata, |
fb03c5eb DC |
1093 | params->channel_type)) { |
1094 | mutex_unlock(&sdata->u.ibss.mtx); | |
cb71b8d8 | 1095 | kfree_skb(skb); |
13c40c54 | 1096 | return -EINVAL; |
fb03c5eb | 1097 | } |
adfba3c7 JB |
1098 | } |
1099 | ||
af8cdcd8 JB |
1100 | if (params->ie) { |
1101 | sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, | |
1102 | GFP_KERNEL); | |
1103 | if (sdata->u.ibss.ie) | |
1104 | sdata->u.ibss.ie_len = params->ie_len; | |
1105 | } | |
1106 | ||
af8cdcd8 JB |
1107 | sdata->u.ibss.skb = skb; |
1108 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; | |
1109 | sdata->u.ibss.ibss_join_req = jiffies; | |
1110 | ||
badecb00 | 1111 | memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); |
0e41f715 JB |
1112 | sdata->u.ibss.ssid_len = params->ssid_len; |
1113 | ||
7da7cc1d JB |
1114 | mutex_unlock(&sdata->u.ibss.mtx); |
1115 | ||
1116 | mutex_lock(&sdata->local->mtx); | |
5cff20e6 | 1117 | ieee80211_recalc_idle(sdata->local); |
7da7cc1d | 1118 | mutex_unlock(&sdata->local->mtx); |
5cff20e6 | 1119 | |
ff3cc5f4 SW |
1120 | /* |
1121 | * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is | |
1122 | * reserved, but an HT STA shall protect HT transmissions as though | |
1123 | * the HT Protection field were set to non-HT mixed mode. | |
1124 | * | |
1125 | * In an IBSS, the RIFS Mode field of the HT Operation element is | |
1126 | * also reserved, but an HT STA shall operate as though this field | |
1127 | * were set to 1. | |
1128 | */ | |
1129 | ||
1130 | sdata->vif.bss_conf.ht_operation_mode |= | |
1131 | IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | |
1132 | | IEEE80211_HT_PARAM_RIFS_MODE; | |
1133 | ||
1134 | changed |= BSS_CHANGED_HT; | |
1135 | ieee80211_bss_info_change_notify(sdata, changed); | |
1136 | ||
64592c8f | 1137 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
af8cdcd8 JB |
1138 | |
1139 | return 0; | |
1140 | } | |
1141 | ||
1142 | int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) | |
1143 | { | |
1144 | struct sk_buff *skb; | |
5ea096c0 TP |
1145 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
1146 | struct ieee80211_local *local = sdata->local; | |
1147 | struct cfg80211_bss *cbss; | |
1148 | u16 capability; | |
7a17a33c | 1149 | int active_ibss; |
8bf11d8d | 1150 | struct sta_info *sta; |
7a17a33c JB |
1151 | |
1152 | mutex_lock(&sdata->u.ibss.mtx); | |
5ea096c0 | 1153 | |
f3209bea JB |
1154 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; |
1155 | memset(sdata->u.ibss.bssid, 0, ETH_ALEN); | |
1156 | sdata->u.ibss.ssid_len = 0; | |
1157 | ||
5ea096c0 TP |
1158 | active_ibss = ieee80211_sta_active_ibss(sdata); |
1159 | ||
1160 | if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) { | |
1161 | capability = WLAN_CAPABILITY_IBSS; | |
1162 | ||
1163 | if (ifibss->privacy) | |
1164 | capability |= WLAN_CAPABILITY_PRIVACY; | |
1165 | ||
1166 | cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->channel, | |
1167 | ifibss->bssid, ifibss->ssid, | |
1168 | ifibss->ssid_len, WLAN_CAPABILITY_IBSS | | |
1169 | WLAN_CAPABILITY_PRIVACY, | |
1170 | capability); | |
1171 | ||
1172 | if (cbss) { | |
1173 | cfg80211_unlink_bss(local->hw.wiphy, cbss); | |
1174 | cfg80211_put_bss(cbss); | |
1175 | } | |
1176 | } | |
af8cdcd8 | 1177 | |
af8cdcd8 | 1178 | sta_info_flush(sdata->local, sdata); |
8bf11d8d JB |
1179 | |
1180 | spin_lock_bh(&ifibss->incomplete_lock); | |
1181 | while (!list_empty(&ifibss->incomplete_stations)) { | |
1182 | sta = list_first_entry(&ifibss->incomplete_stations, | |
1183 | struct sta_info, list); | |
1184 | list_del(&sta->list); | |
1185 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1186 | ||
1187 | sta_info_free(local, sta); | |
1188 | spin_lock_bh(&ifibss->incomplete_lock); | |
1189 | } | |
1190 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1191 | ||
86a2ea41 | 1192 | netif_carrier_off(sdata->dev); |
af8cdcd8 JB |
1193 | |
1194 | /* remove beacon */ | |
1195 | kfree(sdata->u.ibss.ie); | |
40b275b6 JB |
1196 | skb = rcu_dereference_protected(sdata->u.ibss.presp, |
1197 | lockdep_is_held(&sdata->u.ibss.mtx)); | |
a9b3cd7f | 1198 | RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); |
8fc214ba JB |
1199 | sdata->vif.bss_conf.ibss_joined = false; |
1200 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | | |
1201 | BSS_CHANGED_IBSS); | |
af8cdcd8 JB |
1202 | synchronize_rcu(); |
1203 | kfree_skb(skb); | |
1204 | ||
35f20c14 | 1205 | skb_queue_purge(&sdata->skb_queue); |
5cff20e6 | 1206 | |
bc05d19f | 1207 | del_timer_sync(&sdata->u.ibss.timer); |
7a17a33c JB |
1208 | |
1209 | mutex_unlock(&sdata->u.ibss.mtx); | |
bc05d19f | 1210 | |
7da7cc1d | 1211 | mutex_lock(&local->mtx); |
5cff20e6 | 1212 | ieee80211_recalc_idle(sdata->local); |
7da7cc1d | 1213 | mutex_unlock(&local->mtx); |
af8cdcd8 JB |
1214 | |
1215 | return 0; | |
1216 | } |