Commit | Line | Data |
---|---|---|
46900298 JB |
1 | /* |
2 | * IBSS mode implementation | |
3 | * Copyright 2003-2008, Jouni Malinen <j@w1.fi> | |
4 | * Copyright 2004, Instant802 Networks, Inc. | |
5 | * Copyright 2005, Devicescape Software, Inc. | |
6 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
7 | * Copyright 2007, Michael Wu <flamingice@sourmilk.net> | |
8 | * Copyright 2009, Johannes Berg <johannes@sipsolutions.net> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
13 | */ | |
14 | ||
15 | #include <linux/delay.h> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
46900298 JB |
17 | #include <linux/if_ether.h> |
18 | #include <linux/skbuff.h> | |
19 | #include <linux/if_arp.h> | |
20 | #include <linux/etherdevice.h> | |
21 | #include <linux/rtnetlink.h> | |
22 | #include <net/mac80211.h> | |
46900298 JB |
23 | |
24 | #include "ieee80211_i.h" | |
24487981 | 25 | #include "driver-ops.h" |
46900298 JB |
26 | #include "rate.h" |
27 | ||
28 | #define IEEE80211_SCAN_INTERVAL (2 * HZ) | |
46900298 JB |
29 | #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ) |
30 | ||
31 | #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ) | |
32 | #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ) | |
33 | ||
34 | #define IEEE80211_IBSS_MAX_STA_ENTRIES 128 | |
35 | ||
36 | ||
af8cdcd8 JB |
37 | static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
38 | const u8 *bssid, const int beacon_int, | |
39 | struct ieee80211_channel *chan, | |
b59066a2 | 40 | const u32 basic_rates, |
c13a765b SM |
41 | const u16 capability, u64 tsf, |
42 | bool creator) | |
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; | |
c13a765b | 75 | sdata->vif.bss_conf.ibss_creator = false; |
86a2ea41 | 76 | netif_carrier_off(sdata->dev); |
49b5c7f4 JB |
77 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IBSS); |
78 | } | |
79 | ||
af8cdcd8 | 80 | sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0; |
46900298 | 81 | |
13c40c54 | 82 | channel_type = ifibss->channel_type; |
d58e7e37 | 83 | if (!cfg80211_can_beacon_sec_chan(local->hw.wiphy, chan, channel_type)) |
13c40c54 | 84 | channel_type = NL80211_CHAN_HT20; |
55de908a JB |
85 | |
86 | ieee80211_vif_release_channel(sdata); | |
87 | if (ieee80211_vif_use_channel(sdata, chan, channel_type, | |
88 | ifibss->fixed_channel ? | |
89 | IEEE80211_CHANCTX_SHARED : | |
90 | IEEE80211_CHANCTX_EXCLUSIVE)) { | |
91 | sdata_info(sdata, "Failed to join IBSS, no channel context\n"); | |
92 | return; | |
13c40c54 | 93 | } |
55de908a JB |
94 | |
95 | memcpy(ifibss->bssid, bssid, ETH_ALEN); | |
57c4d7b4 | 96 | |
af8cdcd8 | 97 | sband = local->hw.wiphy->bands[chan->band]; |
46900298 | 98 | |
b59066a2 JB |
99 | /* build supported rates array */ |
100 | pos = supp_rates; | |
101 | for (i = 0; i < sband->n_bitrates; i++) { | |
102 | int rate = sband->bitrates[i].bitrate; | |
103 | u8 basic = 0; | |
104 | if (basic_rates & BIT(i)) | |
105 | basic = 0x80; | |
106 | *pos++ = basic | (u8) (rate / 5); | |
107 | } | |
108 | ||
46900298 | 109 | /* Build IBSS probe response */ |
af8cdcd8 | 110 | mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon)); |
46900298 JB |
111 | memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon)); |
112 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | | |
113 | IEEE80211_STYPE_PROBE_RESP); | |
e83e6541 | 114 | eth_broadcast_addr(mgmt->da); |
47846c9b | 115 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
46900298 | 116 | memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN); |
57c4d7b4 | 117 | mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int); |
707c1b4e | 118 | mgmt->u.beacon.timestamp = cpu_to_le64(tsf); |
46900298 JB |
119 | mgmt->u.beacon.capab_info = cpu_to_le16(capability); |
120 | ||
121 | pos = skb_put(skb, 2 + ifibss->ssid_len); | |
122 | *pos++ = WLAN_EID_SSID; | |
123 | *pos++ = ifibss->ssid_len; | |
124 | memcpy(pos, ifibss->ssid, ifibss->ssid_len); | |
125 | ||
b59066a2 | 126 | rates = sband->n_bitrates; |
46900298 JB |
127 | if (rates > 8) |
128 | rates = 8; | |
129 | pos = skb_put(skb, 2 + rates); | |
130 | *pos++ = WLAN_EID_SUPP_RATES; | |
131 | *pos++ = rates; | |
132 | memcpy(pos, supp_rates, rates); | |
133 | ||
134 | if (sband->band == IEEE80211_BAND_2GHZ) { | |
135 | pos = skb_put(skb, 2 + 1); | |
136 | *pos++ = WLAN_EID_DS_PARAMS; | |
137 | *pos++ = 1; | |
af8cdcd8 | 138 | *pos++ = ieee80211_frequency_to_channel(chan->center_freq); |
46900298 JB |
139 | } |
140 | ||
141 | pos = skb_put(skb, 2 + 2); | |
142 | *pos++ = WLAN_EID_IBSS_PARAMS; | |
143 | *pos++ = 2; | |
144 | /* FIX: set ATIM window based on scan results */ | |
145 | *pos++ = 0; | |
146 | *pos++ = 0; | |
147 | ||
b59066a2 JB |
148 | if (sband->n_bitrates > 8) { |
149 | rates = sband->n_bitrates - 8; | |
46900298 JB |
150 | pos = skb_put(skb, 2 + rates); |
151 | *pos++ = WLAN_EID_EXT_SUPP_RATES; | |
152 | *pos++ = rates; | |
153 | memcpy(pos, &supp_rates[8], rates); | |
154 | } | |
155 | ||
af8cdcd8 JB |
156 | if (ifibss->ie_len) |
157 | memcpy(skb_put(skb, ifibss->ie_len), | |
158 | ifibss->ie, ifibss->ie_len); | |
159 | ||
13c40c54 AS |
160 | /* add HT capability and information IEs */ |
161 | if (channel_type && sband->ht_cap.ht_supported) { | |
162 | pos = skb_put(skb, 4 + | |
163 | sizeof(struct ieee80211_ht_cap) + | |
074d46d1 | 164 | sizeof(struct ieee80211_ht_operation)); |
13c40c54 AS |
165 | pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, |
166 | sband->ht_cap.cap); | |
0d894ec5 AN |
167 | /* |
168 | * Note: According to 802.11n-2009 9.13.3.1, HT Protection | |
169 | * field and RIFS Mode are reserved in IBSS mode, therefore | |
170 | * keep them at 0 | |
171 | */ | |
074d46d1 | 172 | pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap, |
431e3154 | 173 | chan, channel_type, 0); |
13c40c54 AS |
174 | } |
175 | ||
32c5057b | 176 | if (local->hw.queues >= IEEE80211_NUM_ACS) { |
9eba6125 BR |
177 | pos = skb_put(skb, 9); |
178 | *pos++ = WLAN_EID_VENDOR_SPECIFIC; | |
179 | *pos++ = 7; /* len */ | |
180 | *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */ | |
181 | *pos++ = 0x50; | |
182 | *pos++ = 0xf2; | |
183 | *pos++ = 2; /* WME */ | |
184 | *pos++ = 0; /* WME info */ | |
185 | *pos++ = 1; /* WME ver */ | |
186 | *pos++ = 0; /* U-APSD no in use */ | |
187 | } | |
188 | ||
cf778b00 | 189 | rcu_assign_pointer(ifibss->presp, skb); |
46900298 | 190 | |
2d0ddec5 | 191 | sdata->vif.bss_conf.beacon_int = beacon_int; |
fbd2c8dc | 192 | sdata->vif.bss_conf.basic_rates = basic_rates; |
2d0ddec5 JB |
193 | bss_change = BSS_CHANGED_BEACON_INT; |
194 | bss_change |= ieee80211_reset_erp_info(sdata); | |
195 | bss_change |= BSS_CHANGED_BSSID; | |
196 | bss_change |= BSS_CHANGED_BEACON; | |
197 | bss_change |= BSS_CHANGED_BEACON_ENABLED; | |
392cfdb1 | 198 | bss_change |= BSS_CHANGED_BASIC_RATES; |
13c40c54 | 199 | bss_change |= BSS_CHANGED_HT; |
8fc214ba JB |
200 | bss_change |= BSS_CHANGED_IBSS; |
201 | sdata->vif.bss_conf.ibss_joined = true; | |
c13a765b | 202 | sdata->vif.bss_conf.ibss_creator = creator; |
2d0ddec5 | 203 | ieee80211_bss_info_change_notify(sdata, bss_change); |
46900298 | 204 | |
b59066a2 | 205 | ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates); |
46900298 | 206 | |
46900298 | 207 | ifibss->state = IEEE80211_IBSS_MLME_JOINED; |
af8cdcd8 JB |
208 | mod_timer(&ifibss->timer, |
209 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 | 210 | |
273686d6 | 211 | bss = cfg80211_inform_bss_frame(local->hw.wiphy, chan, |
f446d10f JB |
212 | mgmt, skb->len, 0, GFP_KERNEL); |
213 | cfg80211_put_bss(bss); | |
86a2ea41 | 214 | netif_carrier_on(sdata->dev); |
af8cdcd8 | 215 | cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL); |
46900298 JB |
216 | } |
217 | ||
af8cdcd8 JB |
218 | static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
219 | struct ieee80211_bss *bss) | |
46900298 | 220 | { |
0c1ad2ca JB |
221 | struct cfg80211_bss *cbss = |
222 | container_of((void *)bss, struct cfg80211_bss, priv); | |
b59066a2 JB |
223 | struct ieee80211_supported_band *sband; |
224 | u32 basic_rates; | |
225 | int i, j; | |
0c1ad2ca | 226 | u16 beacon_int = cbss->beacon_interval; |
57c4d7b4 | 227 | |
7a17a33c JB |
228 | lockdep_assert_held(&sdata->u.ibss.mtx); |
229 | ||
57c4d7b4 JB |
230 | if (beacon_int < 10) |
231 | beacon_int = 10; | |
232 | ||
0c1ad2ca | 233 | sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; |
b59066a2 JB |
234 | |
235 | basic_rates = 0; | |
236 | ||
237 | for (i = 0; i < bss->supp_rates_len; i++) { | |
238 | int rate = (bss->supp_rates[i] & 0x7f) * 5; | |
239 | bool is_basic = !!(bss->supp_rates[i] & 0x80); | |
240 | ||
241 | for (j = 0; j < sband->n_bitrates; j++) { | |
242 | if (sband->bitrates[j].bitrate == rate) { | |
243 | if (is_basic) | |
244 | basic_rates |= BIT(j); | |
245 | break; | |
246 | } | |
247 | } | |
248 | } | |
249 | ||
0c1ad2ca | 250 | __ieee80211_sta_join_ibss(sdata, cbss->bssid, |
57c4d7b4 | 251 | beacon_int, |
0c1ad2ca | 252 | cbss->channel, |
b59066a2 | 253 | basic_rates, |
0c1ad2ca | 254 | cbss->capability, |
c13a765b SM |
255 | cbss->tsf, |
256 | false); | |
46900298 JB |
257 | } |
258 | ||
6d810f10 AQ |
259 | static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta, |
260 | bool auth) | |
8bf11d8d JB |
261 | __acquires(RCU) |
262 | { | |
263 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
264 | u8 addr[ETH_ALEN]; | |
265 | ||
266 | memcpy(addr, sta->sta.addr, ETH_ALEN); | |
267 | ||
bdcbd8e0 | 268 | ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr); |
8bf11d8d | 269 | |
83d5cc01 JB |
270 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); |
271 | sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); | |
267335d6 AQ |
272 | /* authorize the station only if the network is not RSN protected. If |
273 | * not wait for the userspace to authorize it */ | |
274 | if (!sta->sdata->u.ibss.control_port) | |
275 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); | |
8bf11d8d JB |
276 | |
277 | rate_control_rate_init(sta); | |
278 | ||
279 | /* If it fails, maybe we raced another insertion? */ | |
280 | if (sta_info_insert_rcu(sta)) | |
281 | return sta_info_get(sdata, addr); | |
452a6d22 | 282 | if (auth && !sdata->u.ibss.auth_frame_registrations) { |
bdcbd8e0 JB |
283 | ibss_dbg(sdata, |
284 | "TX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=1)\n", | |
2514ec86 | 285 | sdata->vif.addr, addr, sdata->u.ibss.bssid); |
700e8ea6 | 286 | ieee80211_send_auth(sdata, 1, WLAN_AUTH_OPEN, 0, NULL, 0, |
6d810f10 AQ |
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; | |
55de908a JB |
301 | struct ieee80211_chanctx_conf *chanctx_conf; |
302 | int band; | |
8bf11d8d JB |
303 | |
304 | /* | |
305 | * XXX: Consider removing the least recently used entry and | |
306 | * allow new one to be added. | |
307 | */ | |
308 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { | |
bdcbd8e0 | 309 | net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
e87cc472 | 310 | sdata->name, addr); |
8bf11d8d JB |
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 | ||
b203ca39 | 320 | if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) { |
8bf11d8d JB |
321 | rcu_read_lock(); |
322 | return NULL; | |
323 | } | |
324 | ||
55de908a JB |
325 | rcu_read_lock(); |
326 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
327 | if (WARN_ON_ONCE(!chanctx_conf)) | |
328 | return NULL; | |
329 | band = chanctx_conf->channel->band; | |
330 | rcu_read_unlock(); | |
331 | ||
8bf11d8d JB |
332 | sta = sta_info_alloc(sdata, addr, GFP_KERNEL); |
333 | if (!sta) { | |
334 | rcu_read_lock(); | |
335 | return NULL; | |
336 | } | |
337 | ||
338 | sta->last_rx = jiffies; | |
339 | ||
340 | /* make sure mandatory rates are always added */ | |
341 | sta->sta.supp_rates[band] = supp_rates | | |
342 | ieee80211_mandatory_rates(local, band); | |
343 | ||
6d810f10 AQ |
344 | return ieee80211_ibss_finish_sta(sta, auth); |
345 | } | |
346 | ||
2cc59e78 AQ |
347 | static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata, |
348 | struct ieee80211_mgmt *mgmt, | |
349 | size_t len) | |
350 | { | |
351 | u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code); | |
352 | ||
353 | if (len < IEEE80211_DEAUTH_FRAME_LEN) | |
354 | return; | |
355 | ||
356 | ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n", | |
357 | mgmt->sa, mgmt->da, mgmt->bssid, reason); | |
358 | sta_info_destroy_addr(sdata, mgmt->sa); | |
359 | } | |
360 | ||
6d810f10 AQ |
361 | static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, |
362 | struct ieee80211_mgmt *mgmt, | |
363 | size_t len) | |
364 | { | |
365 | u16 auth_alg, auth_transaction; | |
2cc59e78 AQ |
366 | struct sta_info *sta; |
367 | u8 deauth_frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; | |
6d810f10 AQ |
368 | |
369 | lockdep_assert_held(&sdata->u.ibss.mtx); | |
370 | ||
371 | if (len < 24 + 6) | |
372 | return; | |
373 | ||
374 | auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); | |
375 | auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); | |
376 | ||
377 | if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) | |
378 | return; | |
bdcbd8e0 JB |
379 | ibss_dbg(sdata, |
380 | "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n", | |
381 | mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction); | |
6d810f10 | 382 | sta_info_destroy_addr(sdata, mgmt->sa); |
2cc59e78 | 383 | sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 0, false); |
6d810f10 AQ |
384 | rcu_read_unlock(); |
385 | ||
2cc59e78 AQ |
386 | /* |
387 | * if we have any problem in allocating the new station, we reply with a | |
388 | * DEAUTH frame to tell the other end that we had a problem | |
389 | */ | |
390 | if (!sta) { | |
391 | ieee80211_send_deauth_disassoc(sdata, sdata->u.ibss.bssid, | |
392 | IEEE80211_STYPE_DEAUTH, | |
393 | WLAN_REASON_UNSPECIFIED, true, | |
394 | deauth_frame_buf); | |
395 | return; | |
396 | } | |
397 | ||
6d810f10 AQ |
398 | /* |
399 | * IEEE 802.11 standard does not require authentication in IBSS | |
400 | * networks and most implementations do not seem to use it. | |
401 | * However, try to reply to authentication attempts if someone | |
402 | * has actually implemented this. | |
403 | */ | |
700e8ea6 | 404 | ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0, |
6d810f10 | 405 | mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0); |
8bf11d8d JB |
406 | } |
407 | ||
46900298 JB |
408 | static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, |
409 | struct ieee80211_mgmt *mgmt, | |
410 | size_t len, | |
411 | struct ieee80211_rx_status *rx_status, | |
412 | struct ieee802_11_elems *elems, | |
413 | bool beacon) | |
414 | { | |
415 | struct ieee80211_local *local = sdata->local; | |
416 | int freq; | |
0c1ad2ca | 417 | struct cfg80211_bss *cbss; |
46900298 JB |
418 | struct ieee80211_bss *bss; |
419 | struct sta_info *sta; | |
420 | struct ieee80211_channel *channel; | |
421 | u64 beacon_timestamp, rx_timestamp; | |
422 | u32 supp_rates = 0; | |
423 | enum ieee80211_band band = rx_status->band; | |
13c40c54 AS |
424 | struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; |
425 | bool rates_updated = false; | |
46900298 JB |
426 | |
427 | if (elems->ds_params && elems->ds_params_len == 1) | |
59eb21a6 BR |
428 | freq = ieee80211_channel_to_frequency(elems->ds_params[0], |
429 | band); | |
46900298 JB |
430 | else |
431 | freq = rx_status->freq; | |
432 | ||
433 | channel = ieee80211_get_channel(local->hw.wiphy, freq); | |
434 | ||
435 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
436 | return; | |
437 | ||
9eba6125 | 438 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC && |
b203ca39 | 439 | ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) { |
46900298 JB |
440 | |
441 | rcu_read_lock(); | |
abe60632 | 442 | sta = sta_info_get(sdata, mgmt->sa); |
46900298 | 443 | |
9eba6125 BR |
444 | if (elems->supp_rates) { |
445 | supp_rates = ieee80211_sta_get_rates(local, elems, | |
9ebb61a2 | 446 | band, NULL); |
9eba6125 BR |
447 | if (sta) { |
448 | u32 prev_rates; | |
449 | ||
450 | prev_rates = sta->sta.supp_rates[band]; | |
451 | /* make sure mandatory rates are always added */ | |
452 | sta->sta.supp_rates[band] = supp_rates | | |
453 | ieee80211_mandatory_rates(local, band); | |
46900298 | 454 | |
9eba6125 | 455 | if (sta->sta.supp_rates[band] != prev_rates) { |
bdcbd8e0 JB |
456 | ibss_dbg(sdata, |
457 | "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", | |
458 | sta->sta.addr, prev_rates, | |
459 | sta->sta.supp_rates[band]); | |
13c40c54 | 460 | rates_updated = true; |
9eba6125 | 461 | } |
8bf11d8d JB |
462 | } else { |
463 | rcu_read_unlock(); | |
9eba6125 | 464 | sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, |
6d810f10 | 465 | mgmt->sa, supp_rates, true); |
8bf11d8d | 466 | } |
34e89507 | 467 | } |
9eba6125 BR |
468 | |
469 | if (sta && elems->wmm_info) | |
c2c98fde | 470 | set_sta_flag(sta, WLAN_STA_WME); |
9eba6125 | 471 | |
074d46d1 | 472 | if (sta && elems->ht_operation && elems->ht_cap_elem && |
13c40c54 AS |
473 | sdata->u.ibss.channel_type != NL80211_CHAN_NO_HT) { |
474 | /* we both use HT */ | |
475 | struct ieee80211_sta_ht_cap sta_ht_cap_new; | |
476 | enum nl80211_channel_type channel_type = | |
074d46d1 JB |
477 | ieee80211_ht_oper_to_channel_type( |
478 | elems->ht_operation); | |
13c40c54 AS |
479 | |
480 | ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, | |
481 | elems->ht_cap_elem, | |
482 | &sta_ht_cap_new); | |
483 | ||
484 | /* | |
485 | * fall back to HT20 if we don't use or use | |
486 | * the other extension channel | |
487 | */ | |
6741e7f0 FF |
488 | if (!(channel_type == NL80211_CHAN_HT40MINUS || |
489 | channel_type == NL80211_CHAN_HT40PLUS) || | |
13c40c54 AS |
490 | channel_type != sdata->u.ibss.channel_type) |
491 | sta_ht_cap_new.cap &= | |
492 | ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; | |
493 | ||
494 | if (memcmp(&sta->sta.ht_cap, &sta_ht_cap_new, | |
495 | sizeof(sta_ht_cap_new))) { | |
496 | memcpy(&sta->sta.ht_cap, &sta_ht_cap_new, | |
497 | sizeof(sta_ht_cap_new)); | |
498 | rates_updated = true; | |
499 | } | |
500 | } | |
501 | ||
e687f61e AQ |
502 | if (sta && rates_updated) { |
503 | drv_sta_rc_update(local, sdata, &sta->sta, | |
504 | IEEE80211_RC_SUPP_RATES_CHANGED); | |
13c40c54 | 505 | rate_control_rate_init(sta); |
e687f61e | 506 | } |
13c40c54 | 507 | |
9eba6125 | 508 | rcu_read_unlock(); |
46900298 JB |
509 | } |
510 | ||
511 | bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, | |
512 | channel, beacon); | |
513 | if (!bss) | |
514 | return; | |
515 | ||
0c1ad2ca JB |
516 | cbss = container_of((void *)bss, struct cfg80211_bss, priv); |
517 | ||
46900298 | 518 | /* was just updated in ieee80211_bss_info_update */ |
0c1ad2ca | 519 | beacon_timestamp = cbss->tsf; |
46900298 JB |
520 | |
521 | /* check if we need to merge IBSS */ | |
522 | ||
46900298 | 523 | /* we use a fixed BSSID */ |
a98bfec2 | 524 | if (sdata->u.ibss.fixed_bssid) |
46900298 JB |
525 | goto put_bss; |
526 | ||
527 | /* not an IBSS */ | |
0c1ad2ca | 528 | if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) |
46900298 JB |
529 | goto put_bss; |
530 | ||
531 | /* different channel */ | |
55de908a JB |
532 | if (sdata->u.ibss.fixed_channel && |
533 | sdata->u.ibss.channel != cbss->channel) | |
46900298 JB |
534 | goto put_bss; |
535 | ||
536 | /* different SSID */ | |
537 | if (elems->ssid_len != sdata->u.ibss.ssid_len || | |
538 | memcmp(elems->ssid, sdata->u.ibss.ssid, | |
539 | sdata->u.ibss.ssid_len)) | |
540 | goto put_bss; | |
541 | ||
34e8f082 | 542 | /* same BSSID */ |
b203ca39 | 543 | if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) |
34e8f082 AF |
544 | goto put_bss; |
545 | ||
f4bda337 TP |
546 | if (ieee80211_have_rx_timestamp(rx_status)) { |
547 | /* time when timestamp field was received */ | |
548 | rx_timestamp = | |
549 | ieee80211_calculate_rx_timestamp(local, rx_status, | |
550 | len + FCS_LEN, 24); | |
24487981 JB |
551 | } else { |
552 | /* | |
553 | * second best option: get current TSF | |
554 | * (will return -1 if not supported) | |
555 | */ | |
37a41b4a | 556 | rx_timestamp = drv_get_tsf(local, sdata); |
24487981 | 557 | } |
46900298 | 558 | |
bdcbd8e0 JB |
559 | ibss_dbg(sdata, |
560 | "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", | |
561 | mgmt->sa, mgmt->bssid, | |
562 | (unsigned long long)rx_timestamp, | |
563 | (unsigned long long)beacon_timestamp, | |
564 | (unsigned long long)(rx_timestamp - beacon_timestamp), | |
565 | jiffies); | |
46900298 JB |
566 | |
567 | if (beacon_timestamp > rx_timestamp) { | |
bdcbd8e0 JB |
568 | ibss_dbg(sdata, |
569 | "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", | |
570 | mgmt->bssid); | |
46900298 | 571 | ieee80211_sta_join_ibss(sdata, bss); |
9ebb61a2 | 572 | supp_rates = ieee80211_sta_get_rates(local, elems, band, NULL); |
34e89507 | 573 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, |
6d810f10 | 574 | supp_rates, true); |
8bf11d8d | 575 | rcu_read_unlock(); |
46900298 JB |
576 | } |
577 | ||
578 | put_bss: | |
579 | ieee80211_rx_bss_put(local, bss); | |
580 | } | |
581 | ||
8bf11d8d JB |
582 | void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, |
583 | const u8 *bssid, const u8 *addr, | |
584 | u32 supp_rates) | |
46900298 | 585 | { |
2e10d330 | 586 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
46900298 JB |
587 | struct ieee80211_local *local = sdata->local; |
588 | struct sta_info *sta; | |
55de908a JB |
589 | struct ieee80211_chanctx_conf *chanctx_conf; |
590 | int band; | |
46900298 | 591 | |
af8cdcd8 JB |
592 | /* |
593 | * XXX: Consider removing the least recently used entry and | |
594 | * allow new one to be added. | |
595 | */ | |
46900298 | 596 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { |
bdcbd8e0 | 597 | net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
e87cc472 | 598 | sdata->name, addr); |
8bf11d8d | 599 | return; |
46900298 JB |
600 | } |
601 | ||
2e10d330 | 602 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) |
8bf11d8d | 603 | return; |
2e10d330 | 604 | |
b203ca39 | 605 | if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) |
8bf11d8d | 606 | return; |
46900298 | 607 | |
55de908a JB |
608 | rcu_read_lock(); |
609 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
610 | if (WARN_ON_ONCE(!chanctx_conf)) { | |
611 | rcu_read_unlock(); | |
612 | return; | |
613 | } | |
614 | band = chanctx_conf->channel->band; | |
615 | rcu_read_unlock(); | |
616 | ||
8bf11d8d | 617 | sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); |
46900298 | 618 | if (!sta) |
8bf11d8d | 619 | return; |
46900298 | 620 | |
c8716d9d | 621 | sta->last_rx = jiffies; |
d9a7ddb0 | 622 | |
46900298 JB |
623 | /* make sure mandatory rates are always added */ |
624 | sta->sta.supp_rates[band] = supp_rates | | |
625 | ieee80211_mandatory_rates(local, band); | |
626 | ||
8bf11d8d JB |
627 | spin_lock(&ifibss->incomplete_lock); |
628 | list_add(&sta->list, &ifibss->incomplete_stations); | |
629 | spin_unlock(&ifibss->incomplete_lock); | |
630 | ieee80211_queue_work(&local->hw, &sdata->work); | |
46900298 JB |
631 | } |
632 | ||
633 | static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) | |
634 | { | |
635 | struct ieee80211_local *local = sdata->local; | |
636 | int active = 0; | |
637 | struct sta_info *sta; | |
638 | ||
7a17a33c JB |
639 | lockdep_assert_held(&sdata->u.ibss.mtx); |
640 | ||
46900298 JB |
641 | rcu_read_lock(); |
642 | ||
643 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
644 | if (sta->sdata == sdata && | |
645 | time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL, | |
646 | jiffies)) { | |
647 | active++; | |
648 | break; | |
649 | } | |
650 | } | |
651 | ||
652 | rcu_read_unlock(); | |
653 | ||
654 | return active; | |
655 | } | |
656 | ||
ce9058ae BP |
657 | /* |
658 | * This function is called with state == IEEE80211_IBSS_MLME_JOINED | |
659 | */ | |
46900298 JB |
660 | |
661 | static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) | |
662 | { | |
663 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
664 | ||
7a17a33c JB |
665 | lockdep_assert_held(&ifibss->mtx); |
666 | ||
af8cdcd8 JB |
667 | mod_timer(&ifibss->timer, |
668 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 JB |
669 | |
670 | ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT); | |
af8cdcd8 | 671 | |
450aae3d S |
672 | if (time_before(jiffies, ifibss->last_scan_completed + |
673 | IEEE80211_IBSS_MERGE_INTERVAL)) | |
674 | return; | |
675 | ||
46900298 JB |
676 | if (ieee80211_sta_active_ibss(sdata)) |
677 | return; | |
678 | ||
c037b836 | 679 | if (ifibss->fixed_channel) |
46900298 JB |
680 | return; |
681 | ||
bdcbd8e0 JB |
682 | sdata_info(sdata, |
683 | "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); | |
46900298 | 684 | |
be4a4b6a | 685 | ieee80211_request_internal_scan(sdata, |
c037b836 | 686 | ifibss->ssid, ifibss->ssid_len, NULL); |
46900298 JB |
687 | } |
688 | ||
af8cdcd8 | 689 | static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
690 | { |
691 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
46900298 | 692 | u8 bssid[ETH_ALEN]; |
46900298 JB |
693 | u16 capability; |
694 | int i; | |
695 | ||
7a17a33c JB |
696 | lockdep_assert_held(&ifibss->mtx); |
697 | ||
af8cdcd8 | 698 | if (ifibss->fixed_bssid) { |
46900298 JB |
699 | memcpy(bssid, ifibss->bssid, ETH_ALEN); |
700 | } else { | |
701 | /* Generate random, not broadcast, locally administered BSSID. Mix in | |
702 | * own MAC address to make sure that devices that do not have proper | |
703 | * random number generator get different BSSID. */ | |
704 | get_random_bytes(bssid, ETH_ALEN); | |
705 | for (i = 0; i < ETH_ALEN; i++) | |
47846c9b | 706 | bssid[i] ^= sdata->vif.addr[i]; |
46900298 JB |
707 | bssid[0] &= ~0x01; |
708 | bssid[0] |= 0x02; | |
709 | } | |
710 | ||
bdcbd8e0 | 711 | sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); |
46900298 | 712 | |
46900298 JB |
713 | capability = WLAN_CAPABILITY_IBSS; |
714 | ||
fffd0934 | 715 | if (ifibss->privacy) |
46900298 JB |
716 | capability |= WLAN_CAPABILITY_PRIVACY; |
717 | else | |
718 | sdata->drop_unencrypted = 0; | |
719 | ||
57c4d7b4 | 720 | __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, |
fbd2c8dc | 721 | ifibss->channel, ifibss->basic_rates, |
c13a765b | 722 | capability, 0, true); |
46900298 JB |
723 | } |
724 | ||
ce9058ae BP |
725 | /* |
726 | * This function is called with state == IEEE80211_IBSS_MLME_SEARCH | |
727 | */ | |
728 | ||
af8cdcd8 | 729 | static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
730 | { |
731 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
732 | struct ieee80211_local *local = sdata->local; | |
0c1ad2ca | 733 | struct cfg80211_bss *cbss; |
af8cdcd8 | 734 | struct ieee80211_channel *chan = NULL; |
46900298 JB |
735 | const u8 *bssid = NULL; |
736 | int active_ibss; | |
e0d61887 | 737 | u16 capability; |
46900298 | 738 | |
7a17a33c JB |
739 | lockdep_assert_held(&ifibss->mtx); |
740 | ||
46900298 | 741 | active_ibss = ieee80211_sta_active_ibss(sdata); |
bdcbd8e0 | 742 | ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); |
46900298 JB |
743 | |
744 | if (active_ibss) | |
af8cdcd8 | 745 | return; |
46900298 | 746 | |
e0d61887 | 747 | capability = WLAN_CAPABILITY_IBSS; |
fffd0934 | 748 | if (ifibss->privacy) |
e0d61887 | 749 | capability |= WLAN_CAPABILITY_PRIVACY; |
af8cdcd8 JB |
750 | if (ifibss->fixed_bssid) |
751 | bssid = ifibss->bssid; | |
752 | if (ifibss->fixed_channel) | |
753 | chan = ifibss->channel; | |
754 | if (!is_zero_ether_addr(ifibss->bssid)) | |
46900298 | 755 | bssid = ifibss->bssid; |
0c1ad2ca JB |
756 | cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, |
757 | ifibss->ssid, ifibss->ssid_len, | |
758 | WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY, | |
759 | capability); | |
760 | ||
761 | if (cbss) { | |
762 | struct ieee80211_bss *bss; | |
46900298 | 763 | |
0c1ad2ca | 764 | bss = (void *)cbss->priv; |
bdcbd8e0 JB |
765 | ibss_dbg(sdata, |
766 | "sta_find_ibss: selected %pM current %pM\n", | |
767 | cbss->bssid, ifibss->bssid); | |
768 | sdata_info(sdata, | |
769 | "Selected IBSS BSSID %pM based on configured SSID\n", | |
770 | cbss->bssid); | |
46900298 | 771 | |
af8cdcd8 | 772 | ieee80211_sta_join_ibss(sdata, bss); |
46900298 | 773 | ieee80211_rx_bss_put(local, bss); |
af8cdcd8 | 774 | return; |
d419b9f0 | 775 | } |
46900298 | 776 | |
bdcbd8e0 | 777 | ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); |
46900298 JB |
778 | |
779 | /* Selected IBSS not found in current scan results - try to scan */ | |
ce9058ae | 780 | if (time_after(jiffies, ifibss->last_scan_completed + |
46900298 | 781 | IEEE80211_SCAN_INTERVAL)) { |
bdcbd8e0 | 782 | sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); |
46900298 | 783 | |
be4a4b6a JB |
784 | ieee80211_request_internal_scan(sdata, |
785 | ifibss->ssid, ifibss->ssid_len, | |
786 | ifibss->fixed_channel ? ifibss->channel : NULL); | |
ce9058ae | 787 | } else { |
46900298 JB |
788 | int interval = IEEE80211_SCAN_INTERVAL; |
789 | ||
790 | if (time_after(jiffies, ifibss->ibss_join_req + | |
55de908a JB |
791 | IEEE80211_IBSS_JOIN_TIMEOUT)) |
792 | ieee80211_sta_create_ibss(sdata); | |
46900298 | 793 | |
af8cdcd8 JB |
794 | mod_timer(&ifibss->timer, |
795 | round_jiffies(jiffies + interval)); | |
46900298 | 796 | } |
46900298 JB |
797 | } |
798 | ||
799 | static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, | |
c269a203 | 800 | struct sk_buff *req) |
46900298 | 801 | { |
c269a203 | 802 | struct ieee80211_mgmt *mgmt = (void *)req->data; |
46900298 JB |
803 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
804 | struct ieee80211_local *local = sdata->local; | |
c269a203 | 805 | int tx_last_beacon, len = req->len; |
46900298 JB |
806 | struct sk_buff *skb; |
807 | struct ieee80211_mgmt *resp; | |
40b275b6 | 808 | struct sk_buff *presp; |
46900298 JB |
809 | u8 *pos, *end; |
810 | ||
7a17a33c JB |
811 | lockdep_assert_held(&ifibss->mtx); |
812 | ||
40b275b6 JB |
813 | presp = rcu_dereference_protected(ifibss->presp, |
814 | lockdep_is_held(&ifibss->mtx)); | |
815 | ||
46900298 | 816 | if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || |
40b275b6 | 817 | len < 24 + 2 || !presp) |
46900298 JB |
818 | return; |
819 | ||
24487981 | 820 | tx_last_beacon = drv_tx_last_beacon(local); |
46900298 | 821 | |
bdcbd8e0 JB |
822 | ibss_dbg(sdata, |
823 | "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n", | |
824 | mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon); | |
46900298 | 825 | |
1ed76487 | 826 | if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) |
46900298 JB |
827 | return; |
828 | ||
b203ca39 | 829 | if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && |
888d04df | 830 | !is_broadcast_ether_addr(mgmt->bssid)) |
46900298 JB |
831 | return; |
832 | ||
833 | end = ((u8 *) mgmt) + len; | |
834 | pos = mgmt->u.probe_req.variable; | |
835 | if (pos[0] != WLAN_EID_SSID || | |
836 | pos + 2 + pos[1] > end) { | |
bdcbd8e0 JB |
837 | ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", |
838 | mgmt->sa); | |
46900298 JB |
839 | return; |
840 | } | |
841 | if (pos[1] != 0 && | |
842 | (pos[1] != ifibss->ssid_len || | |
0da780c2 | 843 | memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { |
46900298 JB |
844 | /* Ignore ProbeReq for foreign SSID */ |
845 | return; | |
846 | } | |
847 | ||
848 | /* Reply with ProbeResp */ | |
40b275b6 | 849 | skb = skb_copy(presp, GFP_KERNEL); |
46900298 JB |
850 | if (!skb) |
851 | return; | |
852 | ||
853 | resp = (struct ieee80211_mgmt *) skb->data; | |
854 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
bdcbd8e0 | 855 | ibss_dbg(sdata, "Sending ProbeResp to %pM\n", resp->da); |
62ae67be JB |
856 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
857 | ieee80211_tx_skb(sdata, skb); | |
46900298 JB |
858 | } |
859 | ||
860 | static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, | |
861 | struct ieee80211_mgmt *mgmt, | |
862 | size_t len, | |
863 | struct ieee80211_rx_status *rx_status) | |
864 | { | |
865 | size_t baselen; | |
866 | struct ieee802_11_elems elems; | |
867 | ||
46900298 JB |
868 | baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; |
869 | if (baselen > len) | |
870 | return; | |
871 | ||
872 | ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, | |
873 | &elems); | |
874 | ||
875 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); | |
876 | } | |
877 | ||
878 | static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, | |
879 | struct ieee80211_mgmt *mgmt, | |
880 | size_t len, | |
881 | struct ieee80211_rx_status *rx_status) | |
882 | { | |
883 | size_t baselen; | |
884 | struct ieee802_11_elems elems; | |
885 | ||
886 | /* Process beacon from the current BSS */ | |
887 | baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; | |
888 | if (baselen > len) | |
889 | return; | |
890 | ||
891 | ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems); | |
892 | ||
893 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true); | |
894 | } | |
895 | ||
1fa57d01 JB |
896 | void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, |
897 | struct sk_buff *skb) | |
46900298 JB |
898 | { |
899 | struct ieee80211_rx_status *rx_status; | |
900 | struct ieee80211_mgmt *mgmt; | |
901 | u16 fc; | |
902 | ||
f1d58c25 | 903 | rx_status = IEEE80211_SKB_RXCB(skb); |
46900298 JB |
904 | mgmt = (struct ieee80211_mgmt *) skb->data; |
905 | fc = le16_to_cpu(mgmt->frame_control); | |
906 | ||
7a17a33c JB |
907 | mutex_lock(&sdata->u.ibss.mtx); |
908 | ||
c926d006 TH |
909 | if (!sdata->u.ibss.ssid_len) |
910 | goto mgmt_out; /* not ready to merge yet */ | |
911 | ||
46900298 JB |
912 | switch (fc & IEEE80211_FCTL_STYPE) { |
913 | case IEEE80211_STYPE_PROBE_REQ: | |
c269a203 | 914 | ieee80211_rx_mgmt_probe_req(sdata, skb); |
46900298 JB |
915 | break; |
916 | case IEEE80211_STYPE_PROBE_RESP: | |
917 | ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, | |
918 | rx_status); | |
919 | break; | |
920 | case IEEE80211_STYPE_BEACON: | |
921 | ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, | |
922 | rx_status); | |
923 | break; | |
924 | case IEEE80211_STYPE_AUTH: | |
925 | ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); | |
926 | break; | |
2cc59e78 AQ |
927 | case IEEE80211_STYPE_DEAUTH: |
928 | ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); | |
929 | break; | |
46900298 | 930 | } |
7a17a33c | 931 | |
c926d006 | 932 | mgmt_out: |
7a17a33c | 933 | mutex_unlock(&sdata->u.ibss.mtx); |
46900298 JB |
934 | } |
935 | ||
1fa57d01 | 936 | void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) |
46900298 | 937 | { |
1fa57d01 | 938 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
8bf11d8d | 939 | struct sta_info *sta; |
46900298 | 940 | |
7a17a33c JB |
941 | mutex_lock(&ifibss->mtx); |
942 | ||
943 | /* | |
944 | * Work could be scheduled after scan or similar | |
945 | * when we aren't even joined (or trying) with a | |
946 | * network. | |
947 | */ | |
948 | if (!ifibss->ssid_len) | |
949 | goto out; | |
46900298 | 950 | |
8bf11d8d JB |
951 | spin_lock_bh(&ifibss->incomplete_lock); |
952 | while (!list_empty(&ifibss->incomplete_stations)) { | |
953 | sta = list_first_entry(&ifibss->incomplete_stations, | |
954 | struct sta_info, list); | |
955 | list_del(&sta->list); | |
956 | spin_unlock_bh(&ifibss->incomplete_lock); | |
957 | ||
6d810f10 | 958 | ieee80211_ibss_finish_sta(sta, true); |
8bf11d8d JB |
959 | rcu_read_unlock(); |
960 | spin_lock_bh(&ifibss->incomplete_lock); | |
961 | } | |
962 | spin_unlock_bh(&ifibss->incomplete_lock); | |
963 | ||
46900298 JB |
964 | switch (ifibss->state) { |
965 | case IEEE80211_IBSS_MLME_SEARCH: | |
966 | ieee80211_sta_find_ibss(sdata); | |
967 | break; | |
968 | case IEEE80211_IBSS_MLME_JOINED: | |
969 | ieee80211_sta_merge_ibss(sdata); | |
970 | break; | |
971 | default: | |
972 | WARN_ON(1); | |
973 | break; | |
974 | } | |
46900298 | 975 | |
7a17a33c JB |
976 | out: |
977 | mutex_unlock(&ifibss->mtx); | |
3a4d4aa2 JB |
978 | } |
979 | ||
46900298 JB |
980 | static void ieee80211_ibss_timer(unsigned long data) |
981 | { | |
982 | struct ieee80211_sub_if_data *sdata = | |
983 | (struct ieee80211_sub_if_data *) data; | |
984 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
985 | struct ieee80211_local *local = sdata->local; | |
986 | ||
5bb644a0 JB |
987 | if (local->quiescing) { |
988 | ifibss->timer_running = true; | |
989 | return; | |
990 | } | |
991 | ||
7a17a33c | 992 | ieee80211_queue_work(&local->hw, &sdata->work); |
46900298 JB |
993 | } |
994 | ||
5bb644a0 JB |
995 | #ifdef CONFIG_PM |
996 | void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata) | |
997 | { | |
998 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
999 | ||
5bb644a0 JB |
1000 | if (del_timer_sync(&ifibss->timer)) |
1001 | ifibss->timer_running = true; | |
1002 | } | |
1003 | ||
1004 | void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata) | |
1005 | { | |
1006 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1007 | ||
1008 | if (ifibss->timer_running) { | |
1009 | add_timer(&ifibss->timer); | |
1010 | ifibss->timer_running = false; | |
1011 | } | |
1012 | } | |
1013 | #endif | |
1014 | ||
46900298 JB |
1015 | void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) |
1016 | { | |
1017 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1018 | ||
46900298 JB |
1019 | setup_timer(&ifibss->timer, ieee80211_ibss_timer, |
1020 | (unsigned long) sdata); | |
7a17a33c | 1021 | mutex_init(&ifibss->mtx); |
8bf11d8d JB |
1022 | INIT_LIST_HEAD(&ifibss->incomplete_stations); |
1023 | spin_lock_init(&ifibss->incomplete_lock); | |
46900298 JB |
1024 | } |
1025 | ||
1026 | /* scan finished notification */ | |
1027 | void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) | |
1028 | { | |
af8cdcd8 | 1029 | struct ieee80211_sub_if_data *sdata; |
46900298 | 1030 | |
29b4a4f7 JB |
1031 | mutex_lock(&local->iflist_mtx); |
1032 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 1033 | if (!ieee80211_sdata_running(sdata)) |
0e41f715 | 1034 | continue; |
af8cdcd8 JB |
1035 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
1036 | continue; | |
1037 | sdata->u.ibss.last_scan_completed = jiffies; | |
7a17a33c | 1038 | ieee80211_queue_work(&local->hw, &sdata->work); |
46900298 | 1039 | } |
29b4a4f7 | 1040 | mutex_unlock(&local->iflist_mtx); |
46900298 JB |
1041 | } |
1042 | ||
af8cdcd8 JB |
1043 | int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, |
1044 | struct cfg80211_ibss_params *params) | |
1045 | { | |
1046 | struct sk_buff *skb; | |
ff3cc5f4 | 1047 | u32 changed = 0; |
af8cdcd8 | 1048 | |
7a17a33c | 1049 | skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + |
13c40c54 AS |
1050 | sizeof(struct ieee80211_hdr_3addr) + |
1051 | 12 /* struct ieee80211_mgmt.u.beacon */ + | |
1052 | 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ + | |
1053 | 2 + 8 /* max Supported Rates */ + | |
1054 | 3 /* max DS params */ + | |
1055 | 4 /* IBSS params */ + | |
1056 | 2 + (IEEE80211_MAX_SUPP_RATES - 8) + | |
1057 | 2 + sizeof(struct ieee80211_ht_cap) + | |
074d46d1 | 1058 | 2 + sizeof(struct ieee80211_ht_operation) + |
7a17a33c JB |
1059 | params->ie_len); |
1060 | if (!skb) | |
1061 | return -ENOMEM; | |
1062 | ||
1063 | mutex_lock(&sdata->u.ibss.mtx); | |
1064 | ||
af8cdcd8 JB |
1065 | if (params->bssid) { |
1066 | memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); | |
1067 | sdata->u.ibss.fixed_bssid = true; | |
1068 | } else | |
1069 | sdata->u.ibss.fixed_bssid = false; | |
1070 | ||
fffd0934 | 1071 | sdata->u.ibss.privacy = params->privacy; |
267335d6 | 1072 | sdata->u.ibss.control_port = params->control_port; |
fbd2c8dc | 1073 | sdata->u.ibss.basic_rates = params->basic_rates; |
dd5b4cc7 FF |
1074 | memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, |
1075 | sizeof(params->mcast_rate)); | |
fffd0934 | 1076 | |
57c4d7b4 JB |
1077 | sdata->vif.bss_conf.beacon_int = params->beacon_interval; |
1078 | ||
af8cdcd8 | 1079 | sdata->u.ibss.channel = params->channel; |
13c40c54 | 1080 | sdata->u.ibss.channel_type = params->channel_type; |
af8cdcd8 JB |
1081 | sdata->u.ibss.fixed_channel = params->channel_fixed; |
1082 | ||
1083 | if (params->ie) { | |
1084 | sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, | |
1085 | GFP_KERNEL); | |
1086 | if (sdata->u.ibss.ie) | |
1087 | sdata->u.ibss.ie_len = params->ie_len; | |
1088 | } | |
1089 | ||
af8cdcd8 JB |
1090 | sdata->u.ibss.skb = skb; |
1091 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; | |
1092 | sdata->u.ibss.ibss_join_req = jiffies; | |
1093 | ||
badecb00 | 1094 | memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); |
0e41f715 JB |
1095 | sdata->u.ibss.ssid_len = params->ssid_len; |
1096 | ||
7da7cc1d JB |
1097 | mutex_unlock(&sdata->u.ibss.mtx); |
1098 | ||
1099 | mutex_lock(&sdata->local->mtx); | |
5cff20e6 | 1100 | ieee80211_recalc_idle(sdata->local); |
7da7cc1d | 1101 | mutex_unlock(&sdata->local->mtx); |
5cff20e6 | 1102 | |
ff3cc5f4 SW |
1103 | /* |
1104 | * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is | |
1105 | * reserved, but an HT STA shall protect HT transmissions as though | |
1106 | * the HT Protection field were set to non-HT mixed mode. | |
1107 | * | |
1108 | * In an IBSS, the RIFS Mode field of the HT Operation element is | |
1109 | * also reserved, but an HT STA shall operate as though this field | |
1110 | * were set to 1. | |
1111 | */ | |
1112 | ||
1113 | sdata->vif.bss_conf.ht_operation_mode |= | |
1114 | IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | |
1115 | | IEEE80211_HT_PARAM_RIFS_MODE; | |
1116 | ||
1117 | changed |= BSS_CHANGED_HT; | |
1118 | ieee80211_bss_info_change_notify(sdata, changed); | |
1119 | ||
04ecd257 JB |
1120 | sdata->smps_mode = IEEE80211_SMPS_OFF; |
1121 | sdata->needed_rx_chains = sdata->local->rx_chains; | |
1122 | ||
64592c8f | 1123 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
af8cdcd8 JB |
1124 | |
1125 | return 0; | |
1126 | } | |
1127 | ||
1128 | int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) | |
1129 | { | |
1130 | struct sk_buff *skb; | |
5ea096c0 TP |
1131 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
1132 | struct ieee80211_local *local = sdata->local; | |
1133 | struct cfg80211_bss *cbss; | |
1134 | u16 capability; | |
7a17a33c | 1135 | int active_ibss; |
8bf11d8d | 1136 | struct sta_info *sta; |
7a17a33c JB |
1137 | |
1138 | mutex_lock(&sdata->u.ibss.mtx); | |
5ea096c0 | 1139 | |
f3209bea JB |
1140 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; |
1141 | memset(sdata->u.ibss.bssid, 0, ETH_ALEN); | |
1142 | sdata->u.ibss.ssid_len = 0; | |
1143 | ||
5ea096c0 TP |
1144 | active_ibss = ieee80211_sta_active_ibss(sdata); |
1145 | ||
1146 | if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) { | |
1147 | capability = WLAN_CAPABILITY_IBSS; | |
1148 | ||
1149 | if (ifibss->privacy) | |
1150 | capability |= WLAN_CAPABILITY_PRIVACY; | |
1151 | ||
1152 | cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->channel, | |
1153 | ifibss->bssid, ifibss->ssid, | |
1154 | ifibss->ssid_len, WLAN_CAPABILITY_IBSS | | |
1155 | WLAN_CAPABILITY_PRIVACY, | |
1156 | capability); | |
1157 | ||
1158 | if (cbss) { | |
1159 | cfg80211_unlink_bss(local->hw.wiphy, cbss); | |
1160 | cfg80211_put_bss(cbss); | |
1161 | } | |
1162 | } | |
af8cdcd8 | 1163 | |
af8cdcd8 | 1164 | sta_info_flush(sdata->local, sdata); |
8bf11d8d JB |
1165 | |
1166 | spin_lock_bh(&ifibss->incomplete_lock); | |
1167 | while (!list_empty(&ifibss->incomplete_stations)) { | |
1168 | sta = list_first_entry(&ifibss->incomplete_stations, | |
1169 | struct sta_info, list); | |
1170 | list_del(&sta->list); | |
1171 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1172 | ||
1173 | sta_info_free(local, sta); | |
1174 | spin_lock_bh(&ifibss->incomplete_lock); | |
1175 | } | |
1176 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1177 | ||
86a2ea41 | 1178 | netif_carrier_off(sdata->dev); |
af8cdcd8 JB |
1179 | |
1180 | /* remove beacon */ | |
1181 | kfree(sdata->u.ibss.ie); | |
40b275b6 JB |
1182 | skb = rcu_dereference_protected(sdata->u.ibss.presp, |
1183 | lockdep_is_held(&sdata->u.ibss.mtx)); | |
a9b3cd7f | 1184 | RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); |
8fc214ba | 1185 | sdata->vif.bss_conf.ibss_joined = false; |
c13a765b | 1186 | sdata->vif.bss_conf.ibss_creator = false; |
8fc214ba JB |
1187 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | |
1188 | BSS_CHANGED_IBSS); | |
af8cdcd8 JB |
1189 | synchronize_rcu(); |
1190 | kfree_skb(skb); | |
1191 | ||
35f20c14 | 1192 | skb_queue_purge(&sdata->skb_queue); |
5cff20e6 | 1193 | |
bc05d19f | 1194 | del_timer_sync(&sdata->u.ibss.timer); |
7a17a33c JB |
1195 | |
1196 | mutex_unlock(&sdata->u.ibss.mtx); | |
bc05d19f | 1197 | |
7da7cc1d | 1198 | mutex_lock(&local->mtx); |
5cff20e6 | 1199 | ieee80211_recalc_idle(sdata->local); |
7da7cc1d | 1200 | mutex_unlock(&local->mtx); |
af8cdcd8 JB |
1201 | |
1202 | return 0; | |
1203 | } |