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) | |
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]; |
683b6d3b | 54 | struct cfg80211_chan_def chandef; |
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 | |
4bf88530 JB |
82 | cfg80211_chandef_create(&chandef, chan, ifibss->channel_type); |
83 | if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) { | |
84 | chandef.width = NL80211_CHAN_WIDTH_20; | |
85 | chandef.center_freq1 = chan->center_freq; | |
86 | } | |
55de908a JB |
87 | |
88 | ieee80211_vif_release_channel(sdata); | |
4bf88530 | 89 | if (ieee80211_vif_use_channel(sdata, &chandef, |
55de908a JB |
90 | ifibss->fixed_channel ? |
91 | IEEE80211_CHANCTX_SHARED : | |
92 | IEEE80211_CHANCTX_EXCLUSIVE)) { | |
93 | sdata_info(sdata, "Failed to join IBSS, no channel context\n"); | |
94 | return; | |
13c40c54 | 95 | } |
55de908a JB |
96 | |
97 | memcpy(ifibss->bssid, bssid, ETH_ALEN); | |
57c4d7b4 | 98 | |
af8cdcd8 | 99 | sband = local->hw.wiphy->bands[chan->band]; |
46900298 | 100 | |
b59066a2 JB |
101 | /* build supported rates array */ |
102 | pos = supp_rates; | |
103 | for (i = 0; i < sband->n_bitrates; i++) { | |
104 | int rate = sband->bitrates[i].bitrate; | |
105 | u8 basic = 0; | |
106 | if (basic_rates & BIT(i)) | |
107 | basic = 0x80; | |
108 | *pos++ = basic | (u8) (rate / 5); | |
109 | } | |
110 | ||
46900298 | 111 | /* Build IBSS probe response */ |
af8cdcd8 | 112 | mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon)); |
46900298 JB |
113 | memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon)); |
114 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | | |
115 | IEEE80211_STYPE_PROBE_RESP); | |
e83e6541 | 116 | eth_broadcast_addr(mgmt->da); |
47846c9b | 117 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
46900298 | 118 | memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN); |
57c4d7b4 | 119 | mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int); |
707c1b4e | 120 | mgmt->u.beacon.timestamp = cpu_to_le64(tsf); |
46900298 JB |
121 | mgmt->u.beacon.capab_info = cpu_to_le16(capability); |
122 | ||
123 | pos = skb_put(skb, 2 + ifibss->ssid_len); | |
124 | *pos++ = WLAN_EID_SSID; | |
125 | *pos++ = ifibss->ssid_len; | |
126 | memcpy(pos, ifibss->ssid, ifibss->ssid_len); | |
127 | ||
b59066a2 | 128 | rates = sband->n_bitrates; |
46900298 JB |
129 | if (rates > 8) |
130 | rates = 8; | |
131 | pos = skb_put(skb, 2 + rates); | |
132 | *pos++ = WLAN_EID_SUPP_RATES; | |
133 | *pos++ = rates; | |
134 | memcpy(pos, supp_rates, rates); | |
135 | ||
136 | if (sband->band == IEEE80211_BAND_2GHZ) { | |
137 | pos = skb_put(skb, 2 + 1); | |
138 | *pos++ = WLAN_EID_DS_PARAMS; | |
139 | *pos++ = 1; | |
af8cdcd8 | 140 | *pos++ = ieee80211_frequency_to_channel(chan->center_freq); |
46900298 JB |
141 | } |
142 | ||
143 | pos = skb_put(skb, 2 + 2); | |
144 | *pos++ = WLAN_EID_IBSS_PARAMS; | |
145 | *pos++ = 2; | |
146 | /* FIX: set ATIM window based on scan results */ | |
147 | *pos++ = 0; | |
148 | *pos++ = 0; | |
149 | ||
b59066a2 JB |
150 | if (sband->n_bitrates > 8) { |
151 | rates = sband->n_bitrates - 8; | |
46900298 JB |
152 | pos = skb_put(skb, 2 + rates); |
153 | *pos++ = WLAN_EID_EXT_SUPP_RATES; | |
154 | *pos++ = rates; | |
155 | memcpy(pos, &supp_rates[8], rates); | |
156 | } | |
157 | ||
af8cdcd8 JB |
158 | if (ifibss->ie_len) |
159 | memcpy(skb_put(skb, ifibss->ie_len), | |
160 | ifibss->ie, ifibss->ie_len); | |
161 | ||
13c40c54 | 162 | /* add HT capability and information IEs */ |
4bf88530 | 163 | if (chandef.width != NL80211_CHAN_WIDTH_20_NOHT && |
683b6d3b | 164 | sband->ht_cap.ht_supported) { |
13c40c54 AS |
165 | pos = skb_put(skb, 4 + |
166 | sizeof(struct ieee80211_ht_cap) + | |
074d46d1 | 167 | sizeof(struct ieee80211_ht_operation)); |
13c40c54 AS |
168 | pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, |
169 | sband->ht_cap.cap); | |
0d894ec5 AN |
170 | /* |
171 | * Note: According to 802.11n-2009 9.13.3.1, HT Protection | |
172 | * field and RIFS Mode are reserved in IBSS mode, therefore | |
173 | * keep them at 0 | |
174 | */ | |
074d46d1 | 175 | pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap, |
4bf88530 | 176 | &chandef, 0); |
13c40c54 AS |
177 | } |
178 | ||
32c5057b | 179 | if (local->hw.queues >= IEEE80211_NUM_ACS) { |
9eba6125 BR |
180 | pos = skb_put(skb, 9); |
181 | *pos++ = WLAN_EID_VENDOR_SPECIFIC; | |
182 | *pos++ = 7; /* len */ | |
183 | *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */ | |
184 | *pos++ = 0x50; | |
185 | *pos++ = 0xf2; | |
186 | *pos++ = 2; /* WME */ | |
187 | *pos++ = 0; /* WME info */ | |
188 | *pos++ = 1; /* WME ver */ | |
189 | *pos++ = 0; /* U-APSD no in use */ | |
190 | } | |
191 | ||
cf778b00 | 192 | rcu_assign_pointer(ifibss->presp, skb); |
46900298 | 193 | |
2d0ddec5 | 194 | sdata->vif.bss_conf.beacon_int = beacon_int; |
fbd2c8dc | 195 | sdata->vif.bss_conf.basic_rates = basic_rates; |
2d0ddec5 JB |
196 | bss_change = BSS_CHANGED_BEACON_INT; |
197 | bss_change |= ieee80211_reset_erp_info(sdata); | |
198 | bss_change |= BSS_CHANGED_BSSID; | |
199 | bss_change |= BSS_CHANGED_BEACON; | |
200 | bss_change |= BSS_CHANGED_BEACON_ENABLED; | |
392cfdb1 | 201 | bss_change |= BSS_CHANGED_BASIC_RATES; |
13c40c54 | 202 | bss_change |= BSS_CHANGED_HT; |
8fc214ba | 203 | bss_change |= BSS_CHANGED_IBSS; |
2f91a967 SW |
204 | |
205 | /* | |
206 | * In 5 GHz/802.11a, we can always use short slot time. | |
207 | * (IEEE 802.11-2012 18.3.8.7) | |
208 | * | |
209 | * In 2.4GHz, we must always use long slots in IBSS for compatibility | |
210 | * reasons. | |
211 | * (IEEE 802.11-2012 19.4.5) | |
212 | * | |
213 | * HT follows these specifications (IEEE 802.11-2012 20.3.18) | |
214 | */ | |
215 | sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ; | |
216 | bss_change |= BSS_CHANGED_ERP_SLOT; | |
217 | ||
8fc214ba | 218 | sdata->vif.bss_conf.ibss_joined = true; |
c13a765b | 219 | sdata->vif.bss_conf.ibss_creator = creator; |
2d0ddec5 | 220 | ieee80211_bss_info_change_notify(sdata, bss_change); |
46900298 | 221 | |
b59066a2 | 222 | ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates); |
46900298 | 223 | |
46900298 | 224 | ifibss->state = IEEE80211_IBSS_MLME_JOINED; |
af8cdcd8 JB |
225 | mod_timer(&ifibss->timer, |
226 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 | 227 | |
273686d6 | 228 | bss = cfg80211_inform_bss_frame(local->hw.wiphy, chan, |
f446d10f JB |
229 | mgmt, skb->len, 0, GFP_KERNEL); |
230 | cfg80211_put_bss(bss); | |
86a2ea41 | 231 | netif_carrier_on(sdata->dev); |
af8cdcd8 | 232 | cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL); |
46900298 JB |
233 | } |
234 | ||
af8cdcd8 JB |
235 | static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
236 | struct ieee80211_bss *bss) | |
46900298 | 237 | { |
0c1ad2ca JB |
238 | struct cfg80211_bss *cbss = |
239 | container_of((void *)bss, struct cfg80211_bss, priv); | |
b59066a2 JB |
240 | struct ieee80211_supported_band *sband; |
241 | u32 basic_rates; | |
242 | int i, j; | |
0c1ad2ca | 243 | u16 beacon_int = cbss->beacon_interval; |
57c4d7b4 | 244 | |
7a17a33c JB |
245 | lockdep_assert_held(&sdata->u.ibss.mtx); |
246 | ||
57c4d7b4 JB |
247 | if (beacon_int < 10) |
248 | beacon_int = 10; | |
249 | ||
0c1ad2ca | 250 | sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; |
b59066a2 JB |
251 | |
252 | basic_rates = 0; | |
253 | ||
254 | for (i = 0; i < bss->supp_rates_len; i++) { | |
255 | int rate = (bss->supp_rates[i] & 0x7f) * 5; | |
256 | bool is_basic = !!(bss->supp_rates[i] & 0x80); | |
257 | ||
258 | for (j = 0; j < sband->n_bitrates; j++) { | |
259 | if (sband->bitrates[j].bitrate == rate) { | |
260 | if (is_basic) | |
261 | basic_rates |= BIT(j); | |
262 | break; | |
263 | } | |
264 | } | |
265 | } | |
266 | ||
0c1ad2ca | 267 | __ieee80211_sta_join_ibss(sdata, cbss->bssid, |
57c4d7b4 | 268 | beacon_int, |
0c1ad2ca | 269 | cbss->channel, |
b59066a2 | 270 | basic_rates, |
0c1ad2ca | 271 | cbss->capability, |
c13a765b SM |
272 | cbss->tsf, |
273 | false); | |
46900298 JB |
274 | } |
275 | ||
6d810f10 AQ |
276 | static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta, |
277 | bool auth) | |
8bf11d8d JB |
278 | __acquires(RCU) |
279 | { | |
280 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
281 | u8 addr[ETH_ALEN]; | |
282 | ||
283 | memcpy(addr, sta->sta.addr, ETH_ALEN); | |
284 | ||
bdcbd8e0 | 285 | ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr); |
8bf11d8d | 286 | |
83d5cc01 JB |
287 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); |
288 | sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); | |
267335d6 AQ |
289 | /* authorize the station only if the network is not RSN protected. If |
290 | * not wait for the userspace to authorize it */ | |
291 | if (!sta->sdata->u.ibss.control_port) | |
292 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); | |
8bf11d8d JB |
293 | |
294 | rate_control_rate_init(sta); | |
295 | ||
296 | /* If it fails, maybe we raced another insertion? */ | |
297 | if (sta_info_insert_rcu(sta)) | |
298 | return sta_info_get(sdata, addr); | |
452a6d22 | 299 | if (auth && !sdata->u.ibss.auth_frame_registrations) { |
bdcbd8e0 JB |
300 | ibss_dbg(sdata, |
301 | "TX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=1)\n", | |
2514ec86 | 302 | sdata->vif.addr, addr, sdata->u.ibss.bssid); |
700e8ea6 | 303 | ieee80211_send_auth(sdata, 1, WLAN_AUTH_OPEN, 0, NULL, 0, |
6d810f10 AQ |
304 | addr, sdata->u.ibss.bssid, NULL, 0, 0); |
305 | } | |
8bf11d8d JB |
306 | return sta; |
307 | } | |
308 | ||
309 | static struct sta_info * | |
310 | ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, | |
311 | const u8 *bssid, const u8 *addr, | |
6d810f10 | 312 | u32 supp_rates, bool auth) |
8bf11d8d JB |
313 | __acquires(RCU) |
314 | { | |
315 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
316 | struct ieee80211_local *local = sdata->local; | |
317 | struct sta_info *sta; | |
55de908a JB |
318 | struct ieee80211_chanctx_conf *chanctx_conf; |
319 | int band; | |
8bf11d8d JB |
320 | |
321 | /* | |
322 | * XXX: Consider removing the least recently used entry and | |
323 | * allow new one to be added. | |
324 | */ | |
325 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { | |
bdcbd8e0 | 326 | net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
e87cc472 | 327 | sdata->name, addr); |
8bf11d8d JB |
328 | rcu_read_lock(); |
329 | return NULL; | |
330 | } | |
331 | ||
332 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { | |
333 | rcu_read_lock(); | |
334 | return NULL; | |
335 | } | |
336 | ||
b203ca39 | 337 | if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) { |
8bf11d8d JB |
338 | rcu_read_lock(); |
339 | return NULL; | |
340 | } | |
341 | ||
55de908a JB |
342 | rcu_read_lock(); |
343 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
344 | if (WARN_ON_ONCE(!chanctx_conf)) | |
345 | return NULL; | |
4bf88530 | 346 | band = chanctx_conf->def.chan->band; |
55de908a JB |
347 | rcu_read_unlock(); |
348 | ||
8bf11d8d JB |
349 | sta = sta_info_alloc(sdata, addr, GFP_KERNEL); |
350 | if (!sta) { | |
351 | rcu_read_lock(); | |
352 | return NULL; | |
353 | } | |
354 | ||
355 | sta->last_rx = jiffies; | |
356 | ||
357 | /* make sure mandatory rates are always added */ | |
358 | sta->sta.supp_rates[band] = supp_rates | | |
359 | ieee80211_mandatory_rates(local, band); | |
360 | ||
6d810f10 AQ |
361 | return ieee80211_ibss_finish_sta(sta, auth); |
362 | } | |
363 | ||
2cc59e78 AQ |
364 | static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata, |
365 | struct ieee80211_mgmt *mgmt, | |
366 | size_t len) | |
367 | { | |
368 | u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code); | |
369 | ||
370 | if (len < IEEE80211_DEAUTH_FRAME_LEN) | |
371 | return; | |
372 | ||
373 | ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n", | |
374 | mgmt->sa, mgmt->da, mgmt->bssid, reason); | |
375 | sta_info_destroy_addr(sdata, mgmt->sa); | |
376 | } | |
377 | ||
6d810f10 AQ |
378 | static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, |
379 | struct ieee80211_mgmt *mgmt, | |
380 | size_t len) | |
381 | { | |
382 | u16 auth_alg, auth_transaction; | |
2cc59e78 AQ |
383 | struct sta_info *sta; |
384 | u8 deauth_frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; | |
6d810f10 AQ |
385 | |
386 | lockdep_assert_held(&sdata->u.ibss.mtx); | |
387 | ||
388 | if (len < 24 + 6) | |
389 | return; | |
390 | ||
391 | auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); | |
392 | auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); | |
393 | ||
bdcbd8e0 JB |
394 | ibss_dbg(sdata, |
395 | "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n", | |
396 | mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction); | |
7bed2050 AQ |
397 | |
398 | if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) | |
399 | return; | |
400 | ||
6d810f10 | 401 | sta_info_destroy_addr(sdata, mgmt->sa); |
2cc59e78 | 402 | sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 0, false); |
6d810f10 AQ |
403 | rcu_read_unlock(); |
404 | ||
2cc59e78 AQ |
405 | /* |
406 | * if we have any problem in allocating the new station, we reply with a | |
407 | * DEAUTH frame to tell the other end that we had a problem | |
408 | */ | |
409 | if (!sta) { | |
410 | ieee80211_send_deauth_disassoc(sdata, sdata->u.ibss.bssid, | |
411 | IEEE80211_STYPE_DEAUTH, | |
412 | WLAN_REASON_UNSPECIFIED, true, | |
413 | deauth_frame_buf); | |
414 | return; | |
415 | } | |
416 | ||
6d810f10 AQ |
417 | /* |
418 | * IEEE 802.11 standard does not require authentication in IBSS | |
419 | * networks and most implementations do not seem to use it. | |
420 | * However, try to reply to authentication attempts if someone | |
421 | * has actually implemented this. | |
422 | */ | |
700e8ea6 | 423 | ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0, |
6d810f10 | 424 | mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0); |
8bf11d8d JB |
425 | } |
426 | ||
46900298 JB |
427 | static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, |
428 | struct ieee80211_mgmt *mgmt, | |
429 | size_t len, | |
430 | struct ieee80211_rx_status *rx_status, | |
431 | struct ieee802_11_elems *elems, | |
432 | bool beacon) | |
433 | { | |
434 | struct ieee80211_local *local = sdata->local; | |
435 | int freq; | |
0c1ad2ca | 436 | struct cfg80211_bss *cbss; |
46900298 JB |
437 | struct ieee80211_bss *bss; |
438 | struct sta_info *sta; | |
439 | struct ieee80211_channel *channel; | |
440 | u64 beacon_timestamp, rx_timestamp; | |
441 | u32 supp_rates = 0; | |
442 | enum ieee80211_band band = rx_status->band; | |
13c40c54 AS |
443 | struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; |
444 | bool rates_updated = false; | |
46900298 JB |
445 | |
446 | if (elems->ds_params && elems->ds_params_len == 1) | |
59eb21a6 BR |
447 | freq = ieee80211_channel_to_frequency(elems->ds_params[0], |
448 | band); | |
46900298 JB |
449 | else |
450 | freq = rx_status->freq; | |
451 | ||
452 | channel = ieee80211_get_channel(local->hw.wiphy, freq); | |
453 | ||
454 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
455 | return; | |
456 | ||
9eba6125 | 457 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC && |
b203ca39 | 458 | ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) { |
46900298 JB |
459 | |
460 | rcu_read_lock(); | |
abe60632 | 461 | sta = sta_info_get(sdata, mgmt->sa); |
46900298 | 462 | |
9eba6125 BR |
463 | if (elems->supp_rates) { |
464 | supp_rates = ieee80211_sta_get_rates(local, elems, | |
9ebb61a2 | 465 | band, NULL); |
9eba6125 BR |
466 | if (sta) { |
467 | u32 prev_rates; | |
468 | ||
469 | prev_rates = sta->sta.supp_rates[band]; | |
470 | /* make sure mandatory rates are always added */ | |
471 | sta->sta.supp_rates[band] = supp_rates | | |
472 | ieee80211_mandatory_rates(local, band); | |
46900298 | 473 | |
9eba6125 | 474 | if (sta->sta.supp_rates[band] != prev_rates) { |
bdcbd8e0 JB |
475 | ibss_dbg(sdata, |
476 | "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", | |
477 | sta->sta.addr, prev_rates, | |
478 | sta->sta.supp_rates[band]); | |
13c40c54 | 479 | rates_updated = true; |
9eba6125 | 480 | } |
8bf11d8d JB |
481 | } else { |
482 | rcu_read_unlock(); | |
9eba6125 | 483 | sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, |
6d810f10 | 484 | mgmt->sa, supp_rates, true); |
8bf11d8d | 485 | } |
34e89507 | 486 | } |
9eba6125 BR |
487 | |
488 | if (sta && elems->wmm_info) | |
c2c98fde | 489 | set_sta_flag(sta, WLAN_STA_WME); |
9eba6125 | 490 | |
074d46d1 | 491 | if (sta && elems->ht_operation && elems->ht_cap_elem && |
13c40c54 AS |
492 | sdata->u.ibss.channel_type != NL80211_CHAN_NO_HT) { |
493 | /* we both use HT */ | |
494 | struct ieee80211_sta_ht_cap sta_ht_cap_new; | |
4bf88530 JB |
495 | struct cfg80211_chan_def chandef; |
496 | ||
497 | ieee80211_ht_oper_to_chandef(channel, | |
498 | elems->ht_operation, | |
499 | &chandef); | |
13c40c54 AS |
500 | |
501 | ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, | |
502 | elems->ht_cap_elem, | |
503 | &sta_ht_cap_new); | |
504 | ||
505 | /* | |
506 | * fall back to HT20 if we don't use or use | |
507 | * the other extension channel | |
508 | */ | |
4bf88530 JB |
509 | if (chandef.width != NL80211_CHAN_WIDTH_40 || |
510 | cfg80211_get_chandef_type(&chandef) != | |
511 | sdata->u.ibss.channel_type) | |
13c40c54 AS |
512 | sta_ht_cap_new.cap &= |
513 | ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; | |
514 | ||
515 | if (memcmp(&sta->sta.ht_cap, &sta_ht_cap_new, | |
516 | sizeof(sta_ht_cap_new))) { | |
517 | memcpy(&sta->sta.ht_cap, &sta_ht_cap_new, | |
518 | sizeof(sta_ht_cap_new)); | |
519 | rates_updated = true; | |
520 | } | |
521 | } | |
522 | ||
e687f61e AQ |
523 | if (sta && rates_updated) { |
524 | drv_sta_rc_update(local, sdata, &sta->sta, | |
525 | IEEE80211_RC_SUPP_RATES_CHANGED); | |
13c40c54 | 526 | rate_control_rate_init(sta); |
e687f61e | 527 | } |
13c40c54 | 528 | |
9eba6125 | 529 | rcu_read_unlock(); |
46900298 JB |
530 | } |
531 | ||
532 | bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, | |
533 | channel, beacon); | |
534 | if (!bss) | |
535 | return; | |
536 | ||
0c1ad2ca JB |
537 | cbss = container_of((void *)bss, struct cfg80211_bss, priv); |
538 | ||
46900298 | 539 | /* was just updated in ieee80211_bss_info_update */ |
0c1ad2ca | 540 | beacon_timestamp = cbss->tsf; |
46900298 JB |
541 | |
542 | /* check if we need to merge IBSS */ | |
543 | ||
46900298 | 544 | /* we use a fixed BSSID */ |
a98bfec2 | 545 | if (sdata->u.ibss.fixed_bssid) |
46900298 JB |
546 | goto put_bss; |
547 | ||
548 | /* not an IBSS */ | |
0c1ad2ca | 549 | if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) |
46900298 JB |
550 | goto put_bss; |
551 | ||
552 | /* different channel */ | |
55de908a JB |
553 | if (sdata->u.ibss.fixed_channel && |
554 | sdata->u.ibss.channel != cbss->channel) | |
46900298 JB |
555 | goto put_bss; |
556 | ||
557 | /* different SSID */ | |
558 | if (elems->ssid_len != sdata->u.ibss.ssid_len || | |
559 | memcmp(elems->ssid, sdata->u.ibss.ssid, | |
560 | sdata->u.ibss.ssid_len)) | |
561 | goto put_bss; | |
562 | ||
34e8f082 | 563 | /* same BSSID */ |
b203ca39 | 564 | if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) |
34e8f082 AF |
565 | goto put_bss; |
566 | ||
f4bda337 TP |
567 | if (ieee80211_have_rx_timestamp(rx_status)) { |
568 | /* time when timestamp field was received */ | |
569 | rx_timestamp = | |
570 | ieee80211_calculate_rx_timestamp(local, rx_status, | |
571 | len + FCS_LEN, 24); | |
24487981 JB |
572 | } else { |
573 | /* | |
574 | * second best option: get current TSF | |
575 | * (will return -1 if not supported) | |
576 | */ | |
37a41b4a | 577 | rx_timestamp = drv_get_tsf(local, sdata); |
24487981 | 578 | } |
46900298 | 579 | |
bdcbd8e0 JB |
580 | ibss_dbg(sdata, |
581 | "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", | |
582 | mgmt->sa, mgmt->bssid, | |
583 | (unsigned long long)rx_timestamp, | |
584 | (unsigned long long)beacon_timestamp, | |
585 | (unsigned long long)(rx_timestamp - beacon_timestamp), | |
586 | jiffies); | |
46900298 JB |
587 | |
588 | if (beacon_timestamp > rx_timestamp) { | |
bdcbd8e0 JB |
589 | ibss_dbg(sdata, |
590 | "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", | |
591 | mgmt->bssid); | |
46900298 | 592 | ieee80211_sta_join_ibss(sdata, bss); |
9ebb61a2 | 593 | supp_rates = ieee80211_sta_get_rates(local, elems, band, NULL); |
34e89507 | 594 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, |
6d810f10 | 595 | supp_rates, true); |
8bf11d8d | 596 | rcu_read_unlock(); |
46900298 JB |
597 | } |
598 | ||
599 | put_bss: | |
600 | ieee80211_rx_bss_put(local, bss); | |
601 | } | |
602 | ||
8bf11d8d JB |
603 | void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, |
604 | const u8 *bssid, const u8 *addr, | |
605 | u32 supp_rates) | |
46900298 | 606 | { |
2e10d330 | 607 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
46900298 JB |
608 | struct ieee80211_local *local = sdata->local; |
609 | struct sta_info *sta; | |
55de908a JB |
610 | struct ieee80211_chanctx_conf *chanctx_conf; |
611 | int band; | |
46900298 | 612 | |
af8cdcd8 JB |
613 | /* |
614 | * XXX: Consider removing the least recently used entry and | |
615 | * allow new one to be added. | |
616 | */ | |
46900298 | 617 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { |
bdcbd8e0 | 618 | net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
e87cc472 | 619 | sdata->name, addr); |
8bf11d8d | 620 | return; |
46900298 JB |
621 | } |
622 | ||
2e10d330 | 623 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) |
8bf11d8d | 624 | return; |
2e10d330 | 625 | |
b203ca39 | 626 | if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) |
8bf11d8d | 627 | return; |
46900298 | 628 | |
55de908a JB |
629 | rcu_read_lock(); |
630 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
631 | if (WARN_ON_ONCE(!chanctx_conf)) { | |
632 | rcu_read_unlock(); | |
633 | return; | |
634 | } | |
4bf88530 | 635 | band = chanctx_conf->def.chan->band; |
55de908a JB |
636 | rcu_read_unlock(); |
637 | ||
8bf11d8d | 638 | sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); |
46900298 | 639 | if (!sta) |
8bf11d8d | 640 | return; |
46900298 | 641 | |
c8716d9d | 642 | sta->last_rx = jiffies; |
d9a7ddb0 | 643 | |
46900298 JB |
644 | /* make sure mandatory rates are always added */ |
645 | sta->sta.supp_rates[band] = supp_rates | | |
646 | ieee80211_mandatory_rates(local, band); | |
647 | ||
8bf11d8d JB |
648 | spin_lock(&ifibss->incomplete_lock); |
649 | list_add(&sta->list, &ifibss->incomplete_stations); | |
650 | spin_unlock(&ifibss->incomplete_lock); | |
651 | ieee80211_queue_work(&local->hw, &sdata->work); | |
46900298 JB |
652 | } |
653 | ||
654 | static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) | |
655 | { | |
656 | struct ieee80211_local *local = sdata->local; | |
657 | int active = 0; | |
658 | struct sta_info *sta; | |
659 | ||
7a17a33c JB |
660 | lockdep_assert_held(&sdata->u.ibss.mtx); |
661 | ||
46900298 JB |
662 | rcu_read_lock(); |
663 | ||
664 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
665 | if (sta->sdata == sdata && | |
666 | time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL, | |
667 | jiffies)) { | |
668 | active++; | |
669 | break; | |
670 | } | |
671 | } | |
672 | ||
673 | rcu_read_unlock(); | |
674 | ||
675 | return active; | |
676 | } | |
677 | ||
ce9058ae BP |
678 | /* |
679 | * This function is called with state == IEEE80211_IBSS_MLME_JOINED | |
680 | */ | |
46900298 JB |
681 | |
682 | static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) | |
683 | { | |
684 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
685 | ||
7a17a33c JB |
686 | lockdep_assert_held(&ifibss->mtx); |
687 | ||
af8cdcd8 JB |
688 | mod_timer(&ifibss->timer, |
689 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 JB |
690 | |
691 | ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT); | |
af8cdcd8 | 692 | |
450aae3d S |
693 | if (time_before(jiffies, ifibss->last_scan_completed + |
694 | IEEE80211_IBSS_MERGE_INTERVAL)) | |
695 | return; | |
696 | ||
46900298 JB |
697 | if (ieee80211_sta_active_ibss(sdata)) |
698 | return; | |
699 | ||
c037b836 | 700 | if (ifibss->fixed_channel) |
46900298 JB |
701 | return; |
702 | ||
bdcbd8e0 JB |
703 | sdata_info(sdata, |
704 | "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); | |
46900298 | 705 | |
34bcf715 SG |
706 | ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len, |
707 | NULL); | |
46900298 JB |
708 | } |
709 | ||
af8cdcd8 | 710 | static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
711 | { |
712 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
46900298 | 713 | u8 bssid[ETH_ALEN]; |
46900298 JB |
714 | u16 capability; |
715 | int i; | |
716 | ||
7a17a33c JB |
717 | lockdep_assert_held(&ifibss->mtx); |
718 | ||
af8cdcd8 | 719 | if (ifibss->fixed_bssid) { |
46900298 JB |
720 | memcpy(bssid, ifibss->bssid, ETH_ALEN); |
721 | } else { | |
722 | /* Generate random, not broadcast, locally administered BSSID. Mix in | |
723 | * own MAC address to make sure that devices that do not have proper | |
724 | * random number generator get different BSSID. */ | |
725 | get_random_bytes(bssid, ETH_ALEN); | |
726 | for (i = 0; i < ETH_ALEN; i++) | |
47846c9b | 727 | bssid[i] ^= sdata->vif.addr[i]; |
46900298 JB |
728 | bssid[0] &= ~0x01; |
729 | bssid[0] |= 0x02; | |
730 | } | |
731 | ||
bdcbd8e0 | 732 | sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); |
46900298 | 733 | |
46900298 JB |
734 | capability = WLAN_CAPABILITY_IBSS; |
735 | ||
fffd0934 | 736 | if (ifibss->privacy) |
46900298 JB |
737 | capability |= WLAN_CAPABILITY_PRIVACY; |
738 | else | |
739 | sdata->drop_unencrypted = 0; | |
740 | ||
57c4d7b4 | 741 | __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, |
fbd2c8dc | 742 | ifibss->channel, ifibss->basic_rates, |
c13a765b | 743 | capability, 0, true); |
46900298 JB |
744 | } |
745 | ||
ce9058ae BP |
746 | /* |
747 | * This function is called with state == IEEE80211_IBSS_MLME_SEARCH | |
748 | */ | |
749 | ||
af8cdcd8 | 750 | static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
751 | { |
752 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
753 | struct ieee80211_local *local = sdata->local; | |
0c1ad2ca | 754 | struct cfg80211_bss *cbss; |
af8cdcd8 | 755 | struct ieee80211_channel *chan = NULL; |
46900298 JB |
756 | const u8 *bssid = NULL; |
757 | int active_ibss; | |
e0d61887 | 758 | u16 capability; |
46900298 | 759 | |
7a17a33c JB |
760 | lockdep_assert_held(&ifibss->mtx); |
761 | ||
46900298 | 762 | active_ibss = ieee80211_sta_active_ibss(sdata); |
bdcbd8e0 | 763 | ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); |
46900298 JB |
764 | |
765 | if (active_ibss) | |
af8cdcd8 | 766 | return; |
46900298 | 767 | |
e0d61887 | 768 | capability = WLAN_CAPABILITY_IBSS; |
fffd0934 | 769 | if (ifibss->privacy) |
e0d61887 | 770 | capability |= WLAN_CAPABILITY_PRIVACY; |
af8cdcd8 JB |
771 | if (ifibss->fixed_bssid) |
772 | bssid = ifibss->bssid; | |
773 | if (ifibss->fixed_channel) | |
774 | chan = ifibss->channel; | |
775 | if (!is_zero_ether_addr(ifibss->bssid)) | |
46900298 | 776 | bssid = ifibss->bssid; |
0c1ad2ca JB |
777 | cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, |
778 | ifibss->ssid, ifibss->ssid_len, | |
779 | WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY, | |
780 | capability); | |
781 | ||
782 | if (cbss) { | |
783 | struct ieee80211_bss *bss; | |
46900298 | 784 | |
0c1ad2ca | 785 | bss = (void *)cbss->priv; |
bdcbd8e0 JB |
786 | ibss_dbg(sdata, |
787 | "sta_find_ibss: selected %pM current %pM\n", | |
788 | cbss->bssid, ifibss->bssid); | |
789 | sdata_info(sdata, | |
790 | "Selected IBSS BSSID %pM based on configured SSID\n", | |
791 | cbss->bssid); | |
46900298 | 792 | |
af8cdcd8 | 793 | ieee80211_sta_join_ibss(sdata, bss); |
46900298 | 794 | ieee80211_rx_bss_put(local, bss); |
af8cdcd8 | 795 | return; |
d419b9f0 | 796 | } |
46900298 | 797 | |
bdcbd8e0 | 798 | ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); |
46900298 JB |
799 | |
800 | /* Selected IBSS not found in current scan results - try to scan */ | |
ce9058ae | 801 | if (time_after(jiffies, ifibss->last_scan_completed + |
46900298 | 802 | IEEE80211_SCAN_INTERVAL)) { |
bdcbd8e0 | 803 | sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); |
46900298 | 804 | |
34bcf715 SG |
805 | ieee80211_request_ibss_scan(sdata, ifibss->ssid, |
806 | ifibss->ssid_len, chan); | |
ce9058ae | 807 | } else { |
46900298 JB |
808 | int interval = IEEE80211_SCAN_INTERVAL; |
809 | ||
810 | if (time_after(jiffies, ifibss->ibss_join_req + | |
55de908a JB |
811 | IEEE80211_IBSS_JOIN_TIMEOUT)) |
812 | ieee80211_sta_create_ibss(sdata); | |
46900298 | 813 | |
af8cdcd8 JB |
814 | mod_timer(&ifibss->timer, |
815 | round_jiffies(jiffies + interval)); | |
46900298 | 816 | } |
46900298 JB |
817 | } |
818 | ||
819 | static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, | |
c269a203 | 820 | struct sk_buff *req) |
46900298 | 821 | { |
c269a203 | 822 | struct ieee80211_mgmt *mgmt = (void *)req->data; |
46900298 JB |
823 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
824 | struct ieee80211_local *local = sdata->local; | |
c269a203 | 825 | int tx_last_beacon, len = req->len; |
46900298 JB |
826 | struct sk_buff *skb; |
827 | struct ieee80211_mgmt *resp; | |
40b275b6 | 828 | struct sk_buff *presp; |
46900298 JB |
829 | u8 *pos, *end; |
830 | ||
7a17a33c JB |
831 | lockdep_assert_held(&ifibss->mtx); |
832 | ||
40b275b6 JB |
833 | presp = rcu_dereference_protected(ifibss->presp, |
834 | lockdep_is_held(&ifibss->mtx)); | |
835 | ||
46900298 | 836 | if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || |
40b275b6 | 837 | len < 24 + 2 || !presp) |
46900298 JB |
838 | return; |
839 | ||
24487981 | 840 | tx_last_beacon = drv_tx_last_beacon(local); |
46900298 | 841 | |
bdcbd8e0 JB |
842 | ibss_dbg(sdata, |
843 | "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n", | |
844 | mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon); | |
46900298 | 845 | |
1ed76487 | 846 | if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) |
46900298 JB |
847 | return; |
848 | ||
b203ca39 | 849 | if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && |
888d04df | 850 | !is_broadcast_ether_addr(mgmt->bssid)) |
46900298 JB |
851 | return; |
852 | ||
853 | end = ((u8 *) mgmt) + len; | |
854 | pos = mgmt->u.probe_req.variable; | |
855 | if (pos[0] != WLAN_EID_SSID || | |
856 | pos + 2 + pos[1] > end) { | |
bdcbd8e0 JB |
857 | ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", |
858 | mgmt->sa); | |
46900298 JB |
859 | return; |
860 | } | |
861 | if (pos[1] != 0 && | |
862 | (pos[1] != ifibss->ssid_len || | |
0da780c2 | 863 | memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { |
46900298 JB |
864 | /* Ignore ProbeReq for foreign SSID */ |
865 | return; | |
866 | } | |
867 | ||
868 | /* Reply with ProbeResp */ | |
40b275b6 | 869 | skb = skb_copy(presp, GFP_KERNEL); |
46900298 JB |
870 | if (!skb) |
871 | return; | |
872 | ||
873 | resp = (struct ieee80211_mgmt *) skb->data; | |
874 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
bdcbd8e0 | 875 | ibss_dbg(sdata, "Sending ProbeResp to %pM\n", resp->da); |
62ae67be JB |
876 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
877 | ieee80211_tx_skb(sdata, skb); | |
46900298 JB |
878 | } |
879 | ||
880 | static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, | |
881 | struct ieee80211_mgmt *mgmt, | |
882 | size_t len, | |
883 | struct ieee80211_rx_status *rx_status) | |
884 | { | |
885 | size_t baselen; | |
886 | struct ieee802_11_elems elems; | |
887 | ||
46900298 JB |
888 | baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; |
889 | if (baselen > len) | |
890 | return; | |
891 | ||
892 | ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, | |
893 | &elems); | |
894 | ||
895 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); | |
896 | } | |
897 | ||
898 | static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, | |
899 | struct ieee80211_mgmt *mgmt, | |
900 | size_t len, | |
901 | struct ieee80211_rx_status *rx_status) | |
902 | { | |
903 | size_t baselen; | |
904 | struct ieee802_11_elems elems; | |
905 | ||
906 | /* Process beacon from the current BSS */ | |
907 | baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; | |
908 | if (baselen > len) | |
909 | return; | |
910 | ||
911 | ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems); | |
912 | ||
913 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true); | |
914 | } | |
915 | ||
1fa57d01 JB |
916 | void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, |
917 | struct sk_buff *skb) | |
46900298 JB |
918 | { |
919 | struct ieee80211_rx_status *rx_status; | |
920 | struct ieee80211_mgmt *mgmt; | |
921 | u16 fc; | |
922 | ||
f1d58c25 | 923 | rx_status = IEEE80211_SKB_RXCB(skb); |
46900298 JB |
924 | mgmt = (struct ieee80211_mgmt *) skb->data; |
925 | fc = le16_to_cpu(mgmt->frame_control); | |
926 | ||
7a17a33c JB |
927 | mutex_lock(&sdata->u.ibss.mtx); |
928 | ||
c926d006 TH |
929 | if (!sdata->u.ibss.ssid_len) |
930 | goto mgmt_out; /* not ready to merge yet */ | |
931 | ||
46900298 JB |
932 | switch (fc & IEEE80211_FCTL_STYPE) { |
933 | case IEEE80211_STYPE_PROBE_REQ: | |
c269a203 | 934 | ieee80211_rx_mgmt_probe_req(sdata, skb); |
46900298 JB |
935 | break; |
936 | case IEEE80211_STYPE_PROBE_RESP: | |
937 | ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, | |
938 | rx_status); | |
939 | break; | |
940 | case IEEE80211_STYPE_BEACON: | |
941 | ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, | |
942 | rx_status); | |
943 | break; | |
944 | case IEEE80211_STYPE_AUTH: | |
945 | ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); | |
946 | break; | |
2cc59e78 AQ |
947 | case IEEE80211_STYPE_DEAUTH: |
948 | ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); | |
949 | break; | |
46900298 | 950 | } |
7a17a33c | 951 | |
c926d006 | 952 | mgmt_out: |
7a17a33c | 953 | mutex_unlock(&sdata->u.ibss.mtx); |
46900298 JB |
954 | } |
955 | ||
1fa57d01 | 956 | void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) |
46900298 | 957 | { |
1fa57d01 | 958 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
8bf11d8d | 959 | struct sta_info *sta; |
46900298 | 960 | |
7a17a33c JB |
961 | mutex_lock(&ifibss->mtx); |
962 | ||
963 | /* | |
964 | * Work could be scheduled after scan or similar | |
965 | * when we aren't even joined (or trying) with a | |
966 | * network. | |
967 | */ | |
968 | if (!ifibss->ssid_len) | |
969 | goto out; | |
46900298 | 970 | |
8bf11d8d JB |
971 | spin_lock_bh(&ifibss->incomplete_lock); |
972 | while (!list_empty(&ifibss->incomplete_stations)) { | |
973 | sta = list_first_entry(&ifibss->incomplete_stations, | |
974 | struct sta_info, list); | |
975 | list_del(&sta->list); | |
976 | spin_unlock_bh(&ifibss->incomplete_lock); | |
977 | ||
6d810f10 | 978 | ieee80211_ibss_finish_sta(sta, true); |
8bf11d8d JB |
979 | rcu_read_unlock(); |
980 | spin_lock_bh(&ifibss->incomplete_lock); | |
981 | } | |
982 | spin_unlock_bh(&ifibss->incomplete_lock); | |
983 | ||
46900298 JB |
984 | switch (ifibss->state) { |
985 | case IEEE80211_IBSS_MLME_SEARCH: | |
986 | ieee80211_sta_find_ibss(sdata); | |
987 | break; | |
988 | case IEEE80211_IBSS_MLME_JOINED: | |
989 | ieee80211_sta_merge_ibss(sdata); | |
990 | break; | |
991 | default: | |
992 | WARN_ON(1); | |
993 | break; | |
994 | } | |
46900298 | 995 | |
7a17a33c JB |
996 | out: |
997 | mutex_unlock(&ifibss->mtx); | |
3a4d4aa2 JB |
998 | } |
999 | ||
46900298 JB |
1000 | static void ieee80211_ibss_timer(unsigned long data) |
1001 | { | |
1002 | struct ieee80211_sub_if_data *sdata = | |
1003 | (struct ieee80211_sub_if_data *) data; | |
1004 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1005 | struct ieee80211_local *local = sdata->local; | |
1006 | ||
5bb644a0 JB |
1007 | if (local->quiescing) { |
1008 | ifibss->timer_running = true; | |
1009 | return; | |
1010 | } | |
1011 | ||
7a17a33c | 1012 | ieee80211_queue_work(&local->hw, &sdata->work); |
46900298 JB |
1013 | } |
1014 | ||
5bb644a0 JB |
1015 | #ifdef CONFIG_PM |
1016 | void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata) | |
1017 | { | |
1018 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1019 | ||
5bb644a0 JB |
1020 | if (del_timer_sync(&ifibss->timer)) |
1021 | ifibss->timer_running = true; | |
1022 | } | |
1023 | ||
1024 | void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata) | |
1025 | { | |
1026 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1027 | ||
1028 | if (ifibss->timer_running) { | |
1029 | add_timer(&ifibss->timer); | |
1030 | ifibss->timer_running = false; | |
1031 | } | |
1032 | } | |
1033 | #endif | |
1034 | ||
46900298 JB |
1035 | void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) |
1036 | { | |
1037 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1038 | ||
46900298 JB |
1039 | setup_timer(&ifibss->timer, ieee80211_ibss_timer, |
1040 | (unsigned long) sdata); | |
7a17a33c | 1041 | mutex_init(&ifibss->mtx); |
8bf11d8d JB |
1042 | INIT_LIST_HEAD(&ifibss->incomplete_stations); |
1043 | spin_lock_init(&ifibss->incomplete_lock); | |
46900298 JB |
1044 | } |
1045 | ||
1046 | /* scan finished notification */ | |
1047 | void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) | |
1048 | { | |
af8cdcd8 | 1049 | struct ieee80211_sub_if_data *sdata; |
46900298 | 1050 | |
29b4a4f7 JB |
1051 | mutex_lock(&local->iflist_mtx); |
1052 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 1053 | if (!ieee80211_sdata_running(sdata)) |
0e41f715 | 1054 | continue; |
af8cdcd8 JB |
1055 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
1056 | continue; | |
1057 | sdata->u.ibss.last_scan_completed = jiffies; | |
7a17a33c | 1058 | ieee80211_queue_work(&local->hw, &sdata->work); |
46900298 | 1059 | } |
29b4a4f7 | 1060 | mutex_unlock(&local->iflist_mtx); |
46900298 JB |
1061 | } |
1062 | ||
af8cdcd8 JB |
1063 | int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, |
1064 | struct cfg80211_ibss_params *params) | |
1065 | { | |
1066 | struct sk_buff *skb; | |
ff3cc5f4 | 1067 | u32 changed = 0; |
af8cdcd8 | 1068 | |
7a17a33c | 1069 | skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + |
13c40c54 AS |
1070 | sizeof(struct ieee80211_hdr_3addr) + |
1071 | 12 /* struct ieee80211_mgmt.u.beacon */ + | |
1072 | 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ + | |
1073 | 2 + 8 /* max Supported Rates */ + | |
1074 | 3 /* max DS params */ + | |
1075 | 4 /* IBSS params */ + | |
1076 | 2 + (IEEE80211_MAX_SUPP_RATES - 8) + | |
1077 | 2 + sizeof(struct ieee80211_ht_cap) + | |
074d46d1 | 1078 | 2 + sizeof(struct ieee80211_ht_operation) + |
7a17a33c JB |
1079 | params->ie_len); |
1080 | if (!skb) | |
1081 | return -ENOMEM; | |
1082 | ||
1083 | mutex_lock(&sdata->u.ibss.mtx); | |
1084 | ||
af8cdcd8 JB |
1085 | if (params->bssid) { |
1086 | memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); | |
1087 | sdata->u.ibss.fixed_bssid = true; | |
1088 | } else | |
1089 | sdata->u.ibss.fixed_bssid = false; | |
1090 | ||
fffd0934 | 1091 | sdata->u.ibss.privacy = params->privacy; |
267335d6 | 1092 | sdata->u.ibss.control_port = params->control_port; |
fbd2c8dc | 1093 | sdata->u.ibss.basic_rates = params->basic_rates; |
dd5b4cc7 FF |
1094 | memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, |
1095 | sizeof(params->mcast_rate)); | |
fffd0934 | 1096 | |
57c4d7b4 JB |
1097 | sdata->vif.bss_conf.beacon_int = params->beacon_interval; |
1098 | ||
683b6d3b JB |
1099 | sdata->u.ibss.channel = params->chandef.chan; |
1100 | sdata->u.ibss.channel_type = | |
1101 | cfg80211_get_chandef_type(¶ms->chandef); | |
af8cdcd8 JB |
1102 | sdata->u.ibss.fixed_channel = params->channel_fixed; |
1103 | ||
1104 | if (params->ie) { | |
1105 | sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, | |
1106 | GFP_KERNEL); | |
1107 | if (sdata->u.ibss.ie) | |
1108 | sdata->u.ibss.ie_len = params->ie_len; | |
1109 | } | |
1110 | ||
af8cdcd8 JB |
1111 | sdata->u.ibss.skb = skb; |
1112 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; | |
1113 | sdata->u.ibss.ibss_join_req = jiffies; | |
1114 | ||
badecb00 | 1115 | memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); |
0e41f715 JB |
1116 | sdata->u.ibss.ssid_len = params->ssid_len; |
1117 | ||
7da7cc1d JB |
1118 | mutex_unlock(&sdata->u.ibss.mtx); |
1119 | ||
1120 | mutex_lock(&sdata->local->mtx); | |
5cff20e6 | 1121 | ieee80211_recalc_idle(sdata->local); |
7da7cc1d | 1122 | mutex_unlock(&sdata->local->mtx); |
5cff20e6 | 1123 | |
ff3cc5f4 SW |
1124 | /* |
1125 | * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is | |
1126 | * reserved, but an HT STA shall protect HT transmissions as though | |
1127 | * the HT Protection field were set to non-HT mixed mode. | |
1128 | * | |
1129 | * In an IBSS, the RIFS Mode field of the HT Operation element is | |
1130 | * also reserved, but an HT STA shall operate as though this field | |
1131 | * were set to 1. | |
1132 | */ | |
1133 | ||
1134 | sdata->vif.bss_conf.ht_operation_mode |= | |
1135 | IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | |
1136 | | IEEE80211_HT_PARAM_RIFS_MODE; | |
1137 | ||
1138 | changed |= BSS_CHANGED_HT; | |
1139 | ieee80211_bss_info_change_notify(sdata, changed); | |
1140 | ||
04ecd257 JB |
1141 | sdata->smps_mode = IEEE80211_SMPS_OFF; |
1142 | sdata->needed_rx_chains = sdata->local->rx_chains; | |
1143 | ||
64592c8f | 1144 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
af8cdcd8 JB |
1145 | |
1146 | return 0; | |
1147 | } | |
1148 | ||
1149 | int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) | |
1150 | { | |
1151 | struct sk_buff *skb; | |
5ea096c0 TP |
1152 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
1153 | struct ieee80211_local *local = sdata->local; | |
1154 | struct cfg80211_bss *cbss; | |
1155 | u16 capability; | |
7a17a33c | 1156 | int active_ibss; |
8bf11d8d | 1157 | struct sta_info *sta; |
7a17a33c JB |
1158 | |
1159 | mutex_lock(&sdata->u.ibss.mtx); | |
5ea096c0 TP |
1160 | |
1161 | active_ibss = ieee80211_sta_active_ibss(sdata); | |
1162 | ||
1163 | if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) { | |
1164 | capability = WLAN_CAPABILITY_IBSS; | |
1165 | ||
1166 | if (ifibss->privacy) | |
1167 | capability |= WLAN_CAPABILITY_PRIVACY; | |
1168 | ||
1169 | cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->channel, | |
1170 | ifibss->bssid, ifibss->ssid, | |
1171 | ifibss->ssid_len, WLAN_CAPABILITY_IBSS | | |
1172 | WLAN_CAPABILITY_PRIVACY, | |
1173 | capability); | |
1174 | ||
1175 | if (cbss) { | |
1176 | cfg80211_unlink_bss(local->hw.wiphy, cbss); | |
1177 | cfg80211_put_bss(cbss); | |
1178 | } | |
1179 | } | |
af8cdcd8 | 1180 | |
b78a4932 SW |
1181 | ifibss->state = IEEE80211_IBSS_MLME_SEARCH; |
1182 | memset(ifibss->bssid, 0, ETH_ALEN); | |
1183 | ifibss->ssid_len = 0; | |
1184 | ||
af8cdcd8 | 1185 | sta_info_flush(sdata->local, sdata); |
8bf11d8d JB |
1186 | |
1187 | spin_lock_bh(&ifibss->incomplete_lock); | |
1188 | while (!list_empty(&ifibss->incomplete_stations)) { | |
1189 | sta = list_first_entry(&ifibss->incomplete_stations, | |
1190 | struct sta_info, list); | |
1191 | list_del(&sta->list); | |
1192 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1193 | ||
1194 | sta_info_free(local, sta); | |
1195 | spin_lock_bh(&ifibss->incomplete_lock); | |
1196 | } | |
1197 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1198 | ||
86a2ea41 | 1199 | netif_carrier_off(sdata->dev); |
af8cdcd8 JB |
1200 | |
1201 | /* remove beacon */ | |
1202 | kfree(sdata->u.ibss.ie); | |
40b275b6 JB |
1203 | skb = rcu_dereference_protected(sdata->u.ibss.presp, |
1204 | lockdep_is_held(&sdata->u.ibss.mtx)); | |
a9b3cd7f | 1205 | RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); |
8fc214ba | 1206 | sdata->vif.bss_conf.ibss_joined = false; |
c13a765b | 1207 | sdata->vif.bss_conf.ibss_creator = false; |
8fc214ba JB |
1208 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | |
1209 | BSS_CHANGED_IBSS); | |
af8cdcd8 JB |
1210 | synchronize_rcu(); |
1211 | kfree_skb(skb); | |
1212 | ||
35f20c14 | 1213 | skb_queue_purge(&sdata->skb_queue); |
5cff20e6 | 1214 | |
bc05d19f | 1215 | del_timer_sync(&sdata->u.ibss.timer); |
7a17a33c JB |
1216 | |
1217 | mutex_unlock(&sdata->u.ibss.mtx); | |
bc05d19f | 1218 | |
7da7cc1d | 1219 | mutex_lock(&local->mtx); |
5cff20e6 | 1220 | ieee80211_recalc_idle(sdata->local); |
7da7cc1d | 1221 | mutex_unlock(&local->mtx); |
af8cdcd8 JB |
1222 | |
1223 | return 0; | |
1224 | } |