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 | |
683b6d3b JB |
82 | chandef.chan = chan; |
83 | chandef._type = ifibss->channel_type; | |
84 | if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) | |
85 | chandef._type = NL80211_CHAN_HT20; | |
55de908a JB |
86 | |
87 | ieee80211_vif_release_channel(sdata); | |
683b6d3b | 88 | if (ieee80211_vif_use_channel(sdata, chan, chandef._type, |
55de908a JB |
89 | ifibss->fixed_channel ? |
90 | IEEE80211_CHANCTX_SHARED : | |
91 | IEEE80211_CHANCTX_EXCLUSIVE)) { | |
92 | sdata_info(sdata, "Failed to join IBSS, no channel context\n"); | |
93 | return; | |
13c40c54 | 94 | } |
55de908a JB |
95 | |
96 | memcpy(ifibss->bssid, bssid, ETH_ALEN); | |
57c4d7b4 | 97 | |
af8cdcd8 | 98 | sband = local->hw.wiphy->bands[chan->band]; |
46900298 | 99 | |
b59066a2 JB |
100 | /* build supported rates array */ |
101 | pos = supp_rates; | |
102 | for (i = 0; i < sband->n_bitrates; i++) { | |
103 | int rate = sband->bitrates[i].bitrate; | |
104 | u8 basic = 0; | |
105 | if (basic_rates & BIT(i)) | |
106 | basic = 0x80; | |
107 | *pos++ = basic | (u8) (rate / 5); | |
108 | } | |
109 | ||
46900298 | 110 | /* Build IBSS probe response */ |
af8cdcd8 | 111 | mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon)); |
46900298 JB |
112 | memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon)); |
113 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | | |
114 | IEEE80211_STYPE_PROBE_RESP); | |
e83e6541 | 115 | eth_broadcast_addr(mgmt->da); |
47846c9b | 116 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
46900298 | 117 | memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN); |
57c4d7b4 | 118 | mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int); |
707c1b4e | 119 | mgmt->u.beacon.timestamp = cpu_to_le64(tsf); |
46900298 JB |
120 | mgmt->u.beacon.capab_info = cpu_to_le16(capability); |
121 | ||
122 | pos = skb_put(skb, 2 + ifibss->ssid_len); | |
123 | *pos++ = WLAN_EID_SSID; | |
124 | *pos++ = ifibss->ssid_len; | |
125 | memcpy(pos, ifibss->ssid, ifibss->ssid_len); | |
126 | ||
b59066a2 | 127 | rates = sband->n_bitrates; |
46900298 JB |
128 | if (rates > 8) |
129 | rates = 8; | |
130 | pos = skb_put(skb, 2 + rates); | |
131 | *pos++ = WLAN_EID_SUPP_RATES; | |
132 | *pos++ = rates; | |
133 | memcpy(pos, supp_rates, rates); | |
134 | ||
135 | if (sband->band == IEEE80211_BAND_2GHZ) { | |
136 | pos = skb_put(skb, 2 + 1); | |
137 | *pos++ = WLAN_EID_DS_PARAMS; | |
138 | *pos++ = 1; | |
af8cdcd8 | 139 | *pos++ = ieee80211_frequency_to_channel(chan->center_freq); |
46900298 JB |
140 | } |
141 | ||
142 | pos = skb_put(skb, 2 + 2); | |
143 | *pos++ = WLAN_EID_IBSS_PARAMS; | |
144 | *pos++ = 2; | |
145 | /* FIX: set ATIM window based on scan results */ | |
146 | *pos++ = 0; | |
147 | *pos++ = 0; | |
148 | ||
b59066a2 JB |
149 | if (sband->n_bitrates > 8) { |
150 | rates = sband->n_bitrates - 8; | |
46900298 JB |
151 | pos = skb_put(skb, 2 + rates); |
152 | *pos++ = WLAN_EID_EXT_SUPP_RATES; | |
153 | *pos++ = rates; | |
154 | memcpy(pos, &supp_rates[8], rates); | |
155 | } | |
156 | ||
af8cdcd8 JB |
157 | if (ifibss->ie_len) |
158 | memcpy(skb_put(skb, ifibss->ie_len), | |
159 | ifibss->ie, ifibss->ie_len); | |
160 | ||
13c40c54 | 161 | /* add HT capability and information IEs */ |
683b6d3b JB |
162 | if (chandef._type != NL80211_CHAN_NO_HT && |
163 | sband->ht_cap.ht_supported) { | |
13c40c54 AS |
164 | pos = skb_put(skb, 4 + |
165 | sizeof(struct ieee80211_ht_cap) + | |
074d46d1 | 166 | sizeof(struct ieee80211_ht_operation)); |
13c40c54 AS |
167 | pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, |
168 | sband->ht_cap.cap); | |
0d894ec5 AN |
169 | /* |
170 | * Note: According to 802.11n-2009 9.13.3.1, HT Protection | |
171 | * field and RIFS Mode are reserved in IBSS mode, therefore | |
172 | * keep them at 0 | |
173 | */ | |
074d46d1 | 174 | pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap, |
683b6d3b | 175 | chan, chandef._type, 0); |
13c40c54 AS |
176 | } |
177 | ||
32c5057b | 178 | if (local->hw.queues >= IEEE80211_NUM_ACS) { |
9eba6125 BR |
179 | pos = skb_put(skb, 9); |
180 | *pos++ = WLAN_EID_VENDOR_SPECIFIC; | |
181 | *pos++ = 7; /* len */ | |
182 | *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */ | |
183 | *pos++ = 0x50; | |
184 | *pos++ = 0xf2; | |
185 | *pos++ = 2; /* WME */ | |
186 | *pos++ = 0; /* WME info */ | |
187 | *pos++ = 1; /* WME ver */ | |
188 | *pos++ = 0; /* U-APSD no in use */ | |
189 | } | |
190 | ||
cf778b00 | 191 | rcu_assign_pointer(ifibss->presp, skb); |
46900298 | 192 | |
2d0ddec5 | 193 | sdata->vif.bss_conf.beacon_int = beacon_int; |
fbd2c8dc | 194 | sdata->vif.bss_conf.basic_rates = basic_rates; |
2d0ddec5 JB |
195 | bss_change = BSS_CHANGED_BEACON_INT; |
196 | bss_change |= ieee80211_reset_erp_info(sdata); | |
197 | bss_change |= BSS_CHANGED_BSSID; | |
198 | bss_change |= BSS_CHANGED_BEACON; | |
199 | bss_change |= BSS_CHANGED_BEACON_ENABLED; | |
392cfdb1 | 200 | bss_change |= BSS_CHANGED_BASIC_RATES; |
13c40c54 | 201 | bss_change |= BSS_CHANGED_HT; |
8fc214ba JB |
202 | bss_change |= BSS_CHANGED_IBSS; |
203 | sdata->vif.bss_conf.ibss_joined = true; | |
c13a765b | 204 | sdata->vif.bss_conf.ibss_creator = creator; |
2d0ddec5 | 205 | ieee80211_bss_info_change_notify(sdata, bss_change); |
46900298 | 206 | |
b59066a2 | 207 | ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates); |
46900298 | 208 | |
46900298 | 209 | ifibss->state = IEEE80211_IBSS_MLME_JOINED; |
af8cdcd8 JB |
210 | mod_timer(&ifibss->timer, |
211 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 | 212 | |
273686d6 | 213 | bss = cfg80211_inform_bss_frame(local->hw.wiphy, chan, |
f446d10f JB |
214 | mgmt, skb->len, 0, GFP_KERNEL); |
215 | cfg80211_put_bss(bss); | |
86a2ea41 | 216 | netif_carrier_on(sdata->dev); |
af8cdcd8 | 217 | cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL); |
46900298 JB |
218 | } |
219 | ||
af8cdcd8 JB |
220 | static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
221 | struct ieee80211_bss *bss) | |
46900298 | 222 | { |
0c1ad2ca JB |
223 | struct cfg80211_bss *cbss = |
224 | container_of((void *)bss, struct cfg80211_bss, priv); | |
b59066a2 JB |
225 | struct ieee80211_supported_band *sband; |
226 | u32 basic_rates; | |
227 | int i, j; | |
0c1ad2ca | 228 | u16 beacon_int = cbss->beacon_interval; |
57c4d7b4 | 229 | |
7a17a33c JB |
230 | lockdep_assert_held(&sdata->u.ibss.mtx); |
231 | ||
57c4d7b4 JB |
232 | if (beacon_int < 10) |
233 | beacon_int = 10; | |
234 | ||
0c1ad2ca | 235 | sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; |
b59066a2 JB |
236 | |
237 | basic_rates = 0; | |
238 | ||
239 | for (i = 0; i < bss->supp_rates_len; i++) { | |
240 | int rate = (bss->supp_rates[i] & 0x7f) * 5; | |
241 | bool is_basic = !!(bss->supp_rates[i] & 0x80); | |
242 | ||
243 | for (j = 0; j < sband->n_bitrates; j++) { | |
244 | if (sband->bitrates[j].bitrate == rate) { | |
245 | if (is_basic) | |
246 | basic_rates |= BIT(j); | |
247 | break; | |
248 | } | |
249 | } | |
250 | } | |
251 | ||
0c1ad2ca | 252 | __ieee80211_sta_join_ibss(sdata, cbss->bssid, |
57c4d7b4 | 253 | beacon_int, |
0c1ad2ca | 254 | cbss->channel, |
b59066a2 | 255 | basic_rates, |
0c1ad2ca | 256 | cbss->capability, |
c13a765b SM |
257 | cbss->tsf, |
258 | false); | |
46900298 JB |
259 | } |
260 | ||
6d810f10 AQ |
261 | static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta, |
262 | bool auth) | |
8bf11d8d JB |
263 | __acquires(RCU) |
264 | { | |
265 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
266 | u8 addr[ETH_ALEN]; | |
267 | ||
268 | memcpy(addr, sta->sta.addr, ETH_ALEN); | |
269 | ||
bdcbd8e0 | 270 | ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr); |
8bf11d8d | 271 | |
83d5cc01 JB |
272 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); |
273 | sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); | |
267335d6 AQ |
274 | /* authorize the station only if the network is not RSN protected. If |
275 | * not wait for the userspace to authorize it */ | |
276 | if (!sta->sdata->u.ibss.control_port) | |
277 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); | |
8bf11d8d JB |
278 | |
279 | rate_control_rate_init(sta); | |
280 | ||
281 | /* If it fails, maybe we raced another insertion? */ | |
282 | if (sta_info_insert_rcu(sta)) | |
283 | return sta_info_get(sdata, addr); | |
452a6d22 | 284 | if (auth && !sdata->u.ibss.auth_frame_registrations) { |
bdcbd8e0 JB |
285 | ibss_dbg(sdata, |
286 | "TX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=1)\n", | |
2514ec86 | 287 | sdata->vif.addr, addr, sdata->u.ibss.bssid); |
700e8ea6 | 288 | ieee80211_send_auth(sdata, 1, WLAN_AUTH_OPEN, 0, NULL, 0, |
6d810f10 AQ |
289 | addr, sdata->u.ibss.bssid, NULL, 0, 0); |
290 | } | |
8bf11d8d JB |
291 | return sta; |
292 | } | |
293 | ||
294 | static struct sta_info * | |
295 | ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, | |
296 | const u8 *bssid, const u8 *addr, | |
6d810f10 | 297 | u32 supp_rates, bool auth) |
8bf11d8d JB |
298 | __acquires(RCU) |
299 | { | |
300 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
301 | struct ieee80211_local *local = sdata->local; | |
302 | struct sta_info *sta; | |
55de908a JB |
303 | struct ieee80211_chanctx_conf *chanctx_conf; |
304 | int band; | |
8bf11d8d JB |
305 | |
306 | /* | |
307 | * XXX: Consider removing the least recently used entry and | |
308 | * allow new one to be added. | |
309 | */ | |
310 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { | |
bdcbd8e0 | 311 | net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
e87cc472 | 312 | sdata->name, addr); |
8bf11d8d JB |
313 | rcu_read_lock(); |
314 | return NULL; | |
315 | } | |
316 | ||
317 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { | |
318 | rcu_read_lock(); | |
319 | return NULL; | |
320 | } | |
321 | ||
b203ca39 | 322 | if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) { |
8bf11d8d JB |
323 | rcu_read_lock(); |
324 | return NULL; | |
325 | } | |
326 | ||
55de908a JB |
327 | rcu_read_lock(); |
328 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
329 | if (WARN_ON_ONCE(!chanctx_conf)) | |
330 | return NULL; | |
331 | band = chanctx_conf->channel->band; | |
332 | rcu_read_unlock(); | |
333 | ||
8bf11d8d JB |
334 | sta = sta_info_alloc(sdata, addr, GFP_KERNEL); |
335 | if (!sta) { | |
336 | rcu_read_lock(); | |
337 | return NULL; | |
338 | } | |
339 | ||
340 | sta->last_rx = jiffies; | |
341 | ||
342 | /* make sure mandatory rates are always added */ | |
343 | sta->sta.supp_rates[band] = supp_rates | | |
344 | ieee80211_mandatory_rates(local, band); | |
345 | ||
6d810f10 AQ |
346 | return ieee80211_ibss_finish_sta(sta, auth); |
347 | } | |
348 | ||
2cc59e78 AQ |
349 | static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata, |
350 | struct ieee80211_mgmt *mgmt, | |
351 | size_t len) | |
352 | { | |
353 | u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code); | |
354 | ||
355 | if (len < IEEE80211_DEAUTH_FRAME_LEN) | |
356 | return; | |
357 | ||
358 | ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n", | |
359 | mgmt->sa, mgmt->da, mgmt->bssid, reason); | |
360 | sta_info_destroy_addr(sdata, mgmt->sa); | |
361 | } | |
362 | ||
6d810f10 AQ |
363 | static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, |
364 | struct ieee80211_mgmt *mgmt, | |
365 | size_t len) | |
366 | { | |
367 | u16 auth_alg, auth_transaction; | |
2cc59e78 AQ |
368 | struct sta_info *sta; |
369 | u8 deauth_frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; | |
6d810f10 AQ |
370 | |
371 | lockdep_assert_held(&sdata->u.ibss.mtx); | |
372 | ||
373 | if (len < 24 + 6) | |
374 | return; | |
375 | ||
376 | auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); | |
377 | auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); | |
378 | ||
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); | |
7bed2050 AQ |
382 | |
383 | if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) | |
384 | return; | |
385 | ||
6d810f10 | 386 | sta_info_destroy_addr(sdata, mgmt->sa); |
2cc59e78 | 387 | sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 0, false); |
6d810f10 AQ |
388 | rcu_read_unlock(); |
389 | ||
2cc59e78 AQ |
390 | /* |
391 | * if we have any problem in allocating the new station, we reply with a | |
392 | * DEAUTH frame to tell the other end that we had a problem | |
393 | */ | |
394 | if (!sta) { | |
395 | ieee80211_send_deauth_disassoc(sdata, sdata->u.ibss.bssid, | |
396 | IEEE80211_STYPE_DEAUTH, | |
397 | WLAN_REASON_UNSPECIFIED, true, | |
398 | deauth_frame_buf); | |
399 | return; | |
400 | } | |
401 | ||
6d810f10 AQ |
402 | /* |
403 | * IEEE 802.11 standard does not require authentication in IBSS | |
404 | * networks and most implementations do not seem to use it. | |
405 | * However, try to reply to authentication attempts if someone | |
406 | * has actually implemented this. | |
407 | */ | |
700e8ea6 | 408 | ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0, |
6d810f10 | 409 | mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0); |
8bf11d8d JB |
410 | } |
411 | ||
46900298 JB |
412 | static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, |
413 | struct ieee80211_mgmt *mgmt, | |
414 | size_t len, | |
415 | struct ieee80211_rx_status *rx_status, | |
416 | struct ieee802_11_elems *elems, | |
417 | bool beacon) | |
418 | { | |
419 | struct ieee80211_local *local = sdata->local; | |
420 | int freq; | |
0c1ad2ca | 421 | struct cfg80211_bss *cbss; |
46900298 JB |
422 | struct ieee80211_bss *bss; |
423 | struct sta_info *sta; | |
424 | struct ieee80211_channel *channel; | |
425 | u64 beacon_timestamp, rx_timestamp; | |
426 | u32 supp_rates = 0; | |
427 | enum ieee80211_band band = rx_status->band; | |
13c40c54 AS |
428 | struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; |
429 | bool rates_updated = false; | |
46900298 JB |
430 | |
431 | if (elems->ds_params && elems->ds_params_len == 1) | |
59eb21a6 BR |
432 | freq = ieee80211_channel_to_frequency(elems->ds_params[0], |
433 | band); | |
46900298 JB |
434 | else |
435 | freq = rx_status->freq; | |
436 | ||
437 | channel = ieee80211_get_channel(local->hw.wiphy, freq); | |
438 | ||
439 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
440 | return; | |
441 | ||
9eba6125 | 442 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC && |
b203ca39 | 443 | ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) { |
46900298 JB |
444 | |
445 | rcu_read_lock(); | |
abe60632 | 446 | sta = sta_info_get(sdata, mgmt->sa); |
46900298 | 447 | |
9eba6125 BR |
448 | if (elems->supp_rates) { |
449 | supp_rates = ieee80211_sta_get_rates(local, elems, | |
9ebb61a2 | 450 | band, NULL); |
9eba6125 BR |
451 | if (sta) { |
452 | u32 prev_rates; | |
453 | ||
454 | prev_rates = sta->sta.supp_rates[band]; | |
455 | /* make sure mandatory rates are always added */ | |
456 | sta->sta.supp_rates[band] = supp_rates | | |
457 | ieee80211_mandatory_rates(local, band); | |
46900298 | 458 | |
9eba6125 | 459 | if (sta->sta.supp_rates[band] != prev_rates) { |
bdcbd8e0 JB |
460 | ibss_dbg(sdata, |
461 | "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", | |
462 | sta->sta.addr, prev_rates, | |
463 | sta->sta.supp_rates[band]); | |
13c40c54 | 464 | rates_updated = true; |
9eba6125 | 465 | } |
8bf11d8d JB |
466 | } else { |
467 | rcu_read_unlock(); | |
9eba6125 | 468 | sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, |
6d810f10 | 469 | mgmt->sa, supp_rates, true); |
8bf11d8d | 470 | } |
34e89507 | 471 | } |
9eba6125 BR |
472 | |
473 | if (sta && elems->wmm_info) | |
c2c98fde | 474 | set_sta_flag(sta, WLAN_STA_WME); |
9eba6125 | 475 | |
074d46d1 | 476 | if (sta && elems->ht_operation && elems->ht_cap_elem && |
13c40c54 AS |
477 | sdata->u.ibss.channel_type != NL80211_CHAN_NO_HT) { |
478 | /* we both use HT */ | |
479 | struct ieee80211_sta_ht_cap sta_ht_cap_new; | |
480 | enum nl80211_channel_type channel_type = | |
074d46d1 JB |
481 | ieee80211_ht_oper_to_channel_type( |
482 | elems->ht_operation); | |
13c40c54 AS |
483 | |
484 | ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, | |
485 | elems->ht_cap_elem, | |
486 | &sta_ht_cap_new); | |
487 | ||
488 | /* | |
489 | * fall back to HT20 if we don't use or use | |
490 | * the other extension channel | |
491 | */ | |
6741e7f0 FF |
492 | if (!(channel_type == NL80211_CHAN_HT40MINUS || |
493 | channel_type == NL80211_CHAN_HT40PLUS) || | |
13c40c54 AS |
494 | channel_type != sdata->u.ibss.channel_type) |
495 | sta_ht_cap_new.cap &= | |
496 | ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; | |
497 | ||
498 | if (memcmp(&sta->sta.ht_cap, &sta_ht_cap_new, | |
499 | sizeof(sta_ht_cap_new))) { | |
500 | memcpy(&sta->sta.ht_cap, &sta_ht_cap_new, | |
501 | sizeof(sta_ht_cap_new)); | |
502 | rates_updated = true; | |
503 | } | |
504 | } | |
505 | ||
e687f61e AQ |
506 | if (sta && rates_updated) { |
507 | drv_sta_rc_update(local, sdata, &sta->sta, | |
508 | IEEE80211_RC_SUPP_RATES_CHANGED); | |
13c40c54 | 509 | rate_control_rate_init(sta); |
e687f61e | 510 | } |
13c40c54 | 511 | |
9eba6125 | 512 | rcu_read_unlock(); |
46900298 JB |
513 | } |
514 | ||
515 | bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, | |
516 | channel, beacon); | |
517 | if (!bss) | |
518 | return; | |
519 | ||
0c1ad2ca JB |
520 | cbss = container_of((void *)bss, struct cfg80211_bss, priv); |
521 | ||
46900298 | 522 | /* was just updated in ieee80211_bss_info_update */ |
0c1ad2ca | 523 | beacon_timestamp = cbss->tsf; |
46900298 JB |
524 | |
525 | /* check if we need to merge IBSS */ | |
526 | ||
46900298 | 527 | /* we use a fixed BSSID */ |
a98bfec2 | 528 | if (sdata->u.ibss.fixed_bssid) |
46900298 JB |
529 | goto put_bss; |
530 | ||
531 | /* not an IBSS */ | |
0c1ad2ca | 532 | if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) |
46900298 JB |
533 | goto put_bss; |
534 | ||
535 | /* different channel */ | |
55de908a JB |
536 | if (sdata->u.ibss.fixed_channel && |
537 | sdata->u.ibss.channel != cbss->channel) | |
46900298 JB |
538 | goto put_bss; |
539 | ||
540 | /* different SSID */ | |
541 | if (elems->ssid_len != sdata->u.ibss.ssid_len || | |
542 | memcmp(elems->ssid, sdata->u.ibss.ssid, | |
543 | sdata->u.ibss.ssid_len)) | |
544 | goto put_bss; | |
545 | ||
34e8f082 | 546 | /* same BSSID */ |
b203ca39 | 547 | if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) |
34e8f082 AF |
548 | goto put_bss; |
549 | ||
f4bda337 TP |
550 | if (ieee80211_have_rx_timestamp(rx_status)) { |
551 | /* time when timestamp field was received */ | |
552 | rx_timestamp = | |
553 | ieee80211_calculate_rx_timestamp(local, rx_status, | |
554 | len + FCS_LEN, 24); | |
24487981 JB |
555 | } else { |
556 | /* | |
557 | * second best option: get current TSF | |
558 | * (will return -1 if not supported) | |
559 | */ | |
37a41b4a | 560 | rx_timestamp = drv_get_tsf(local, sdata); |
24487981 | 561 | } |
46900298 | 562 | |
bdcbd8e0 JB |
563 | ibss_dbg(sdata, |
564 | "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", | |
565 | mgmt->sa, mgmt->bssid, | |
566 | (unsigned long long)rx_timestamp, | |
567 | (unsigned long long)beacon_timestamp, | |
568 | (unsigned long long)(rx_timestamp - beacon_timestamp), | |
569 | jiffies); | |
46900298 JB |
570 | |
571 | if (beacon_timestamp > rx_timestamp) { | |
bdcbd8e0 JB |
572 | ibss_dbg(sdata, |
573 | "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", | |
574 | mgmt->bssid); | |
46900298 | 575 | ieee80211_sta_join_ibss(sdata, bss); |
9ebb61a2 | 576 | supp_rates = ieee80211_sta_get_rates(local, elems, band, NULL); |
34e89507 | 577 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, |
6d810f10 | 578 | supp_rates, true); |
8bf11d8d | 579 | rcu_read_unlock(); |
46900298 JB |
580 | } |
581 | ||
582 | put_bss: | |
583 | ieee80211_rx_bss_put(local, bss); | |
584 | } | |
585 | ||
8bf11d8d JB |
586 | void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, |
587 | const u8 *bssid, const u8 *addr, | |
588 | u32 supp_rates) | |
46900298 | 589 | { |
2e10d330 | 590 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
46900298 JB |
591 | struct ieee80211_local *local = sdata->local; |
592 | struct sta_info *sta; | |
55de908a JB |
593 | struct ieee80211_chanctx_conf *chanctx_conf; |
594 | int band; | |
46900298 | 595 | |
af8cdcd8 JB |
596 | /* |
597 | * XXX: Consider removing the least recently used entry and | |
598 | * allow new one to be added. | |
599 | */ | |
46900298 | 600 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { |
bdcbd8e0 | 601 | net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
e87cc472 | 602 | sdata->name, addr); |
8bf11d8d | 603 | return; |
46900298 JB |
604 | } |
605 | ||
2e10d330 | 606 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) |
8bf11d8d | 607 | return; |
2e10d330 | 608 | |
b203ca39 | 609 | if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) |
8bf11d8d | 610 | return; |
46900298 | 611 | |
55de908a JB |
612 | rcu_read_lock(); |
613 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
614 | if (WARN_ON_ONCE(!chanctx_conf)) { | |
615 | rcu_read_unlock(); | |
616 | return; | |
617 | } | |
618 | band = chanctx_conf->channel->band; | |
619 | rcu_read_unlock(); | |
620 | ||
8bf11d8d | 621 | sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); |
46900298 | 622 | if (!sta) |
8bf11d8d | 623 | return; |
46900298 | 624 | |
c8716d9d | 625 | sta->last_rx = jiffies; |
d9a7ddb0 | 626 | |
46900298 JB |
627 | /* make sure mandatory rates are always added */ |
628 | sta->sta.supp_rates[band] = supp_rates | | |
629 | ieee80211_mandatory_rates(local, band); | |
630 | ||
8bf11d8d JB |
631 | spin_lock(&ifibss->incomplete_lock); |
632 | list_add(&sta->list, &ifibss->incomplete_stations); | |
633 | spin_unlock(&ifibss->incomplete_lock); | |
634 | ieee80211_queue_work(&local->hw, &sdata->work); | |
46900298 JB |
635 | } |
636 | ||
637 | static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) | |
638 | { | |
639 | struct ieee80211_local *local = sdata->local; | |
640 | int active = 0; | |
641 | struct sta_info *sta; | |
642 | ||
7a17a33c JB |
643 | lockdep_assert_held(&sdata->u.ibss.mtx); |
644 | ||
46900298 JB |
645 | rcu_read_lock(); |
646 | ||
647 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
648 | if (sta->sdata == sdata && | |
649 | time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL, | |
650 | jiffies)) { | |
651 | active++; | |
652 | break; | |
653 | } | |
654 | } | |
655 | ||
656 | rcu_read_unlock(); | |
657 | ||
658 | return active; | |
659 | } | |
660 | ||
ce9058ae BP |
661 | /* |
662 | * This function is called with state == IEEE80211_IBSS_MLME_JOINED | |
663 | */ | |
46900298 JB |
664 | |
665 | static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) | |
666 | { | |
667 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
668 | ||
7a17a33c JB |
669 | lockdep_assert_held(&ifibss->mtx); |
670 | ||
af8cdcd8 JB |
671 | mod_timer(&ifibss->timer, |
672 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 JB |
673 | |
674 | ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT); | |
af8cdcd8 | 675 | |
450aae3d S |
676 | if (time_before(jiffies, ifibss->last_scan_completed + |
677 | IEEE80211_IBSS_MERGE_INTERVAL)) | |
678 | return; | |
679 | ||
46900298 JB |
680 | if (ieee80211_sta_active_ibss(sdata)) |
681 | return; | |
682 | ||
c037b836 | 683 | if (ifibss->fixed_channel) |
46900298 JB |
684 | return; |
685 | ||
bdcbd8e0 JB |
686 | sdata_info(sdata, |
687 | "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); | |
46900298 | 688 | |
be4a4b6a | 689 | ieee80211_request_internal_scan(sdata, |
c037b836 | 690 | ifibss->ssid, ifibss->ssid_len, NULL); |
46900298 JB |
691 | } |
692 | ||
af8cdcd8 | 693 | static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
694 | { |
695 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
46900298 | 696 | u8 bssid[ETH_ALEN]; |
46900298 JB |
697 | u16 capability; |
698 | int i; | |
699 | ||
7a17a33c JB |
700 | lockdep_assert_held(&ifibss->mtx); |
701 | ||
af8cdcd8 | 702 | if (ifibss->fixed_bssid) { |
46900298 JB |
703 | memcpy(bssid, ifibss->bssid, ETH_ALEN); |
704 | } else { | |
705 | /* Generate random, not broadcast, locally administered BSSID. Mix in | |
706 | * own MAC address to make sure that devices that do not have proper | |
707 | * random number generator get different BSSID. */ | |
708 | get_random_bytes(bssid, ETH_ALEN); | |
709 | for (i = 0; i < ETH_ALEN; i++) | |
47846c9b | 710 | bssid[i] ^= sdata->vif.addr[i]; |
46900298 JB |
711 | bssid[0] &= ~0x01; |
712 | bssid[0] |= 0x02; | |
713 | } | |
714 | ||
bdcbd8e0 | 715 | sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); |
46900298 | 716 | |
46900298 JB |
717 | capability = WLAN_CAPABILITY_IBSS; |
718 | ||
fffd0934 | 719 | if (ifibss->privacy) |
46900298 JB |
720 | capability |= WLAN_CAPABILITY_PRIVACY; |
721 | else | |
722 | sdata->drop_unencrypted = 0; | |
723 | ||
57c4d7b4 | 724 | __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, |
fbd2c8dc | 725 | ifibss->channel, ifibss->basic_rates, |
c13a765b | 726 | capability, 0, true); |
46900298 JB |
727 | } |
728 | ||
ce9058ae BP |
729 | /* |
730 | * This function is called with state == IEEE80211_IBSS_MLME_SEARCH | |
731 | */ | |
732 | ||
af8cdcd8 | 733 | static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
734 | { |
735 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
736 | struct ieee80211_local *local = sdata->local; | |
0c1ad2ca | 737 | struct cfg80211_bss *cbss; |
af8cdcd8 | 738 | struct ieee80211_channel *chan = NULL; |
46900298 JB |
739 | const u8 *bssid = NULL; |
740 | int active_ibss; | |
e0d61887 | 741 | u16 capability; |
46900298 | 742 | |
7a17a33c JB |
743 | lockdep_assert_held(&ifibss->mtx); |
744 | ||
46900298 | 745 | active_ibss = ieee80211_sta_active_ibss(sdata); |
bdcbd8e0 | 746 | ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); |
46900298 JB |
747 | |
748 | if (active_ibss) | |
af8cdcd8 | 749 | return; |
46900298 | 750 | |
e0d61887 | 751 | capability = WLAN_CAPABILITY_IBSS; |
fffd0934 | 752 | if (ifibss->privacy) |
e0d61887 | 753 | capability |= WLAN_CAPABILITY_PRIVACY; |
af8cdcd8 JB |
754 | if (ifibss->fixed_bssid) |
755 | bssid = ifibss->bssid; | |
756 | if (ifibss->fixed_channel) | |
757 | chan = ifibss->channel; | |
758 | if (!is_zero_ether_addr(ifibss->bssid)) | |
46900298 | 759 | bssid = ifibss->bssid; |
0c1ad2ca JB |
760 | cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, |
761 | ifibss->ssid, ifibss->ssid_len, | |
762 | WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY, | |
763 | capability); | |
764 | ||
765 | if (cbss) { | |
766 | struct ieee80211_bss *bss; | |
46900298 | 767 | |
0c1ad2ca | 768 | bss = (void *)cbss->priv; |
bdcbd8e0 JB |
769 | ibss_dbg(sdata, |
770 | "sta_find_ibss: selected %pM current %pM\n", | |
771 | cbss->bssid, ifibss->bssid); | |
772 | sdata_info(sdata, | |
773 | "Selected IBSS BSSID %pM based on configured SSID\n", | |
774 | cbss->bssid); | |
46900298 | 775 | |
af8cdcd8 | 776 | ieee80211_sta_join_ibss(sdata, bss); |
46900298 | 777 | ieee80211_rx_bss_put(local, bss); |
af8cdcd8 | 778 | return; |
d419b9f0 | 779 | } |
46900298 | 780 | |
bdcbd8e0 | 781 | ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); |
46900298 JB |
782 | |
783 | /* Selected IBSS not found in current scan results - try to scan */ | |
ce9058ae | 784 | if (time_after(jiffies, ifibss->last_scan_completed + |
46900298 | 785 | IEEE80211_SCAN_INTERVAL)) { |
bdcbd8e0 | 786 | sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); |
46900298 | 787 | |
be4a4b6a JB |
788 | ieee80211_request_internal_scan(sdata, |
789 | ifibss->ssid, ifibss->ssid_len, | |
790 | ifibss->fixed_channel ? ifibss->channel : NULL); | |
ce9058ae | 791 | } else { |
46900298 JB |
792 | int interval = IEEE80211_SCAN_INTERVAL; |
793 | ||
794 | if (time_after(jiffies, ifibss->ibss_join_req + | |
55de908a JB |
795 | IEEE80211_IBSS_JOIN_TIMEOUT)) |
796 | ieee80211_sta_create_ibss(sdata); | |
46900298 | 797 | |
af8cdcd8 JB |
798 | mod_timer(&ifibss->timer, |
799 | round_jiffies(jiffies + interval)); | |
46900298 | 800 | } |
46900298 JB |
801 | } |
802 | ||
803 | static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, | |
c269a203 | 804 | struct sk_buff *req) |
46900298 | 805 | { |
c269a203 | 806 | struct ieee80211_mgmt *mgmt = (void *)req->data; |
46900298 JB |
807 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
808 | struct ieee80211_local *local = sdata->local; | |
c269a203 | 809 | int tx_last_beacon, len = req->len; |
46900298 JB |
810 | struct sk_buff *skb; |
811 | struct ieee80211_mgmt *resp; | |
40b275b6 | 812 | struct sk_buff *presp; |
46900298 JB |
813 | u8 *pos, *end; |
814 | ||
7a17a33c JB |
815 | lockdep_assert_held(&ifibss->mtx); |
816 | ||
40b275b6 JB |
817 | presp = rcu_dereference_protected(ifibss->presp, |
818 | lockdep_is_held(&ifibss->mtx)); | |
819 | ||
46900298 | 820 | if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || |
40b275b6 | 821 | len < 24 + 2 || !presp) |
46900298 JB |
822 | return; |
823 | ||
24487981 | 824 | tx_last_beacon = drv_tx_last_beacon(local); |
46900298 | 825 | |
bdcbd8e0 JB |
826 | ibss_dbg(sdata, |
827 | "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n", | |
828 | mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon); | |
46900298 | 829 | |
1ed76487 | 830 | if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) |
46900298 JB |
831 | return; |
832 | ||
b203ca39 | 833 | if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && |
888d04df | 834 | !is_broadcast_ether_addr(mgmt->bssid)) |
46900298 JB |
835 | return; |
836 | ||
837 | end = ((u8 *) mgmt) + len; | |
838 | pos = mgmt->u.probe_req.variable; | |
839 | if (pos[0] != WLAN_EID_SSID || | |
840 | pos + 2 + pos[1] > end) { | |
bdcbd8e0 JB |
841 | ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", |
842 | mgmt->sa); | |
46900298 JB |
843 | return; |
844 | } | |
845 | if (pos[1] != 0 && | |
846 | (pos[1] != ifibss->ssid_len || | |
0da780c2 | 847 | memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { |
46900298 JB |
848 | /* Ignore ProbeReq for foreign SSID */ |
849 | return; | |
850 | } | |
851 | ||
852 | /* Reply with ProbeResp */ | |
40b275b6 | 853 | skb = skb_copy(presp, GFP_KERNEL); |
46900298 JB |
854 | if (!skb) |
855 | return; | |
856 | ||
857 | resp = (struct ieee80211_mgmt *) skb->data; | |
858 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
bdcbd8e0 | 859 | ibss_dbg(sdata, "Sending ProbeResp to %pM\n", resp->da); |
62ae67be JB |
860 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
861 | ieee80211_tx_skb(sdata, skb); | |
46900298 JB |
862 | } |
863 | ||
864 | static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, | |
865 | struct ieee80211_mgmt *mgmt, | |
866 | size_t len, | |
867 | struct ieee80211_rx_status *rx_status) | |
868 | { | |
869 | size_t baselen; | |
870 | struct ieee802_11_elems elems; | |
871 | ||
46900298 JB |
872 | baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; |
873 | if (baselen > len) | |
874 | return; | |
875 | ||
876 | ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, | |
877 | &elems); | |
878 | ||
879 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); | |
880 | } | |
881 | ||
882 | static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, | |
883 | struct ieee80211_mgmt *mgmt, | |
884 | size_t len, | |
885 | struct ieee80211_rx_status *rx_status) | |
886 | { | |
887 | size_t baselen; | |
888 | struct ieee802_11_elems elems; | |
889 | ||
890 | /* Process beacon from the current BSS */ | |
891 | baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; | |
892 | if (baselen > len) | |
893 | return; | |
894 | ||
895 | ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems); | |
896 | ||
897 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true); | |
898 | } | |
899 | ||
1fa57d01 JB |
900 | void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, |
901 | struct sk_buff *skb) | |
46900298 JB |
902 | { |
903 | struct ieee80211_rx_status *rx_status; | |
904 | struct ieee80211_mgmt *mgmt; | |
905 | u16 fc; | |
906 | ||
f1d58c25 | 907 | rx_status = IEEE80211_SKB_RXCB(skb); |
46900298 JB |
908 | mgmt = (struct ieee80211_mgmt *) skb->data; |
909 | fc = le16_to_cpu(mgmt->frame_control); | |
910 | ||
7a17a33c JB |
911 | mutex_lock(&sdata->u.ibss.mtx); |
912 | ||
c926d006 TH |
913 | if (!sdata->u.ibss.ssid_len) |
914 | goto mgmt_out; /* not ready to merge yet */ | |
915 | ||
46900298 JB |
916 | switch (fc & IEEE80211_FCTL_STYPE) { |
917 | case IEEE80211_STYPE_PROBE_REQ: | |
c269a203 | 918 | ieee80211_rx_mgmt_probe_req(sdata, skb); |
46900298 JB |
919 | break; |
920 | case IEEE80211_STYPE_PROBE_RESP: | |
921 | ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, | |
922 | rx_status); | |
923 | break; | |
924 | case IEEE80211_STYPE_BEACON: | |
925 | ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, | |
926 | rx_status); | |
927 | break; | |
928 | case IEEE80211_STYPE_AUTH: | |
929 | ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); | |
930 | break; | |
2cc59e78 AQ |
931 | case IEEE80211_STYPE_DEAUTH: |
932 | ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); | |
933 | break; | |
46900298 | 934 | } |
7a17a33c | 935 | |
c926d006 | 936 | mgmt_out: |
7a17a33c | 937 | mutex_unlock(&sdata->u.ibss.mtx); |
46900298 JB |
938 | } |
939 | ||
1fa57d01 | 940 | void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) |
46900298 | 941 | { |
1fa57d01 | 942 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
8bf11d8d | 943 | struct sta_info *sta; |
46900298 | 944 | |
7a17a33c JB |
945 | mutex_lock(&ifibss->mtx); |
946 | ||
947 | /* | |
948 | * Work could be scheduled after scan or similar | |
949 | * when we aren't even joined (or trying) with a | |
950 | * network. | |
951 | */ | |
952 | if (!ifibss->ssid_len) | |
953 | goto out; | |
46900298 | 954 | |
8bf11d8d JB |
955 | spin_lock_bh(&ifibss->incomplete_lock); |
956 | while (!list_empty(&ifibss->incomplete_stations)) { | |
957 | sta = list_first_entry(&ifibss->incomplete_stations, | |
958 | struct sta_info, list); | |
959 | list_del(&sta->list); | |
960 | spin_unlock_bh(&ifibss->incomplete_lock); | |
961 | ||
6d810f10 | 962 | ieee80211_ibss_finish_sta(sta, true); |
8bf11d8d JB |
963 | rcu_read_unlock(); |
964 | spin_lock_bh(&ifibss->incomplete_lock); | |
965 | } | |
966 | spin_unlock_bh(&ifibss->incomplete_lock); | |
967 | ||
46900298 JB |
968 | switch (ifibss->state) { |
969 | case IEEE80211_IBSS_MLME_SEARCH: | |
970 | ieee80211_sta_find_ibss(sdata); | |
971 | break; | |
972 | case IEEE80211_IBSS_MLME_JOINED: | |
973 | ieee80211_sta_merge_ibss(sdata); | |
974 | break; | |
975 | default: | |
976 | WARN_ON(1); | |
977 | break; | |
978 | } | |
46900298 | 979 | |
7a17a33c JB |
980 | out: |
981 | mutex_unlock(&ifibss->mtx); | |
3a4d4aa2 JB |
982 | } |
983 | ||
46900298 JB |
984 | static void ieee80211_ibss_timer(unsigned long data) |
985 | { | |
986 | struct ieee80211_sub_if_data *sdata = | |
987 | (struct ieee80211_sub_if_data *) data; | |
988 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
989 | struct ieee80211_local *local = sdata->local; | |
990 | ||
5bb644a0 JB |
991 | if (local->quiescing) { |
992 | ifibss->timer_running = true; | |
993 | return; | |
994 | } | |
995 | ||
7a17a33c | 996 | ieee80211_queue_work(&local->hw, &sdata->work); |
46900298 JB |
997 | } |
998 | ||
5bb644a0 JB |
999 | #ifdef CONFIG_PM |
1000 | void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata) | |
1001 | { | |
1002 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1003 | ||
5bb644a0 JB |
1004 | if (del_timer_sync(&ifibss->timer)) |
1005 | ifibss->timer_running = true; | |
1006 | } | |
1007 | ||
1008 | void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata) | |
1009 | { | |
1010 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1011 | ||
1012 | if (ifibss->timer_running) { | |
1013 | add_timer(&ifibss->timer); | |
1014 | ifibss->timer_running = false; | |
1015 | } | |
1016 | } | |
1017 | #endif | |
1018 | ||
46900298 JB |
1019 | void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) |
1020 | { | |
1021 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1022 | ||
46900298 JB |
1023 | setup_timer(&ifibss->timer, ieee80211_ibss_timer, |
1024 | (unsigned long) sdata); | |
7a17a33c | 1025 | mutex_init(&ifibss->mtx); |
8bf11d8d JB |
1026 | INIT_LIST_HEAD(&ifibss->incomplete_stations); |
1027 | spin_lock_init(&ifibss->incomplete_lock); | |
46900298 JB |
1028 | } |
1029 | ||
1030 | /* scan finished notification */ | |
1031 | void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) | |
1032 | { | |
af8cdcd8 | 1033 | struct ieee80211_sub_if_data *sdata; |
46900298 | 1034 | |
29b4a4f7 JB |
1035 | mutex_lock(&local->iflist_mtx); |
1036 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 1037 | if (!ieee80211_sdata_running(sdata)) |
0e41f715 | 1038 | continue; |
af8cdcd8 JB |
1039 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
1040 | continue; | |
1041 | sdata->u.ibss.last_scan_completed = jiffies; | |
7a17a33c | 1042 | ieee80211_queue_work(&local->hw, &sdata->work); |
46900298 | 1043 | } |
29b4a4f7 | 1044 | mutex_unlock(&local->iflist_mtx); |
46900298 JB |
1045 | } |
1046 | ||
af8cdcd8 JB |
1047 | int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, |
1048 | struct cfg80211_ibss_params *params) | |
1049 | { | |
1050 | struct sk_buff *skb; | |
ff3cc5f4 | 1051 | u32 changed = 0; |
af8cdcd8 | 1052 | |
7a17a33c | 1053 | skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + |
13c40c54 AS |
1054 | sizeof(struct ieee80211_hdr_3addr) + |
1055 | 12 /* struct ieee80211_mgmt.u.beacon */ + | |
1056 | 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ + | |
1057 | 2 + 8 /* max Supported Rates */ + | |
1058 | 3 /* max DS params */ + | |
1059 | 4 /* IBSS params */ + | |
1060 | 2 + (IEEE80211_MAX_SUPP_RATES - 8) + | |
1061 | 2 + sizeof(struct ieee80211_ht_cap) + | |
074d46d1 | 1062 | 2 + sizeof(struct ieee80211_ht_operation) + |
7a17a33c JB |
1063 | params->ie_len); |
1064 | if (!skb) | |
1065 | return -ENOMEM; | |
1066 | ||
1067 | mutex_lock(&sdata->u.ibss.mtx); | |
1068 | ||
af8cdcd8 JB |
1069 | if (params->bssid) { |
1070 | memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); | |
1071 | sdata->u.ibss.fixed_bssid = true; | |
1072 | } else | |
1073 | sdata->u.ibss.fixed_bssid = false; | |
1074 | ||
fffd0934 | 1075 | sdata->u.ibss.privacy = params->privacy; |
267335d6 | 1076 | sdata->u.ibss.control_port = params->control_port; |
fbd2c8dc | 1077 | sdata->u.ibss.basic_rates = params->basic_rates; |
dd5b4cc7 FF |
1078 | memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, |
1079 | sizeof(params->mcast_rate)); | |
fffd0934 | 1080 | |
57c4d7b4 JB |
1081 | sdata->vif.bss_conf.beacon_int = params->beacon_interval; |
1082 | ||
683b6d3b JB |
1083 | sdata->u.ibss.channel = params->chandef.chan; |
1084 | sdata->u.ibss.channel_type = | |
1085 | cfg80211_get_chandef_type(¶ms->chandef); | |
af8cdcd8 JB |
1086 | sdata->u.ibss.fixed_channel = params->channel_fixed; |
1087 | ||
1088 | if (params->ie) { | |
1089 | sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, | |
1090 | GFP_KERNEL); | |
1091 | if (sdata->u.ibss.ie) | |
1092 | sdata->u.ibss.ie_len = params->ie_len; | |
1093 | } | |
1094 | ||
af8cdcd8 JB |
1095 | sdata->u.ibss.skb = skb; |
1096 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; | |
1097 | sdata->u.ibss.ibss_join_req = jiffies; | |
1098 | ||
badecb00 | 1099 | memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); |
0e41f715 JB |
1100 | sdata->u.ibss.ssid_len = params->ssid_len; |
1101 | ||
7da7cc1d JB |
1102 | mutex_unlock(&sdata->u.ibss.mtx); |
1103 | ||
1104 | mutex_lock(&sdata->local->mtx); | |
5cff20e6 | 1105 | ieee80211_recalc_idle(sdata->local); |
7da7cc1d | 1106 | mutex_unlock(&sdata->local->mtx); |
5cff20e6 | 1107 | |
ff3cc5f4 SW |
1108 | /* |
1109 | * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is | |
1110 | * reserved, but an HT STA shall protect HT transmissions as though | |
1111 | * the HT Protection field were set to non-HT mixed mode. | |
1112 | * | |
1113 | * In an IBSS, the RIFS Mode field of the HT Operation element is | |
1114 | * also reserved, but an HT STA shall operate as though this field | |
1115 | * were set to 1. | |
1116 | */ | |
1117 | ||
1118 | sdata->vif.bss_conf.ht_operation_mode |= | |
1119 | IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | |
1120 | | IEEE80211_HT_PARAM_RIFS_MODE; | |
1121 | ||
1122 | changed |= BSS_CHANGED_HT; | |
1123 | ieee80211_bss_info_change_notify(sdata, changed); | |
1124 | ||
04ecd257 JB |
1125 | sdata->smps_mode = IEEE80211_SMPS_OFF; |
1126 | sdata->needed_rx_chains = sdata->local->rx_chains; | |
1127 | ||
64592c8f | 1128 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
af8cdcd8 JB |
1129 | |
1130 | return 0; | |
1131 | } | |
1132 | ||
1133 | int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) | |
1134 | { | |
1135 | struct sk_buff *skb; | |
5ea096c0 TP |
1136 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
1137 | struct ieee80211_local *local = sdata->local; | |
1138 | struct cfg80211_bss *cbss; | |
1139 | u16 capability; | |
7a17a33c | 1140 | int active_ibss; |
8bf11d8d | 1141 | struct sta_info *sta; |
7a17a33c JB |
1142 | |
1143 | mutex_lock(&sdata->u.ibss.mtx); | |
5ea096c0 | 1144 | |
f3209bea JB |
1145 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; |
1146 | memset(sdata->u.ibss.bssid, 0, ETH_ALEN); | |
1147 | sdata->u.ibss.ssid_len = 0; | |
1148 | ||
5ea096c0 TP |
1149 | active_ibss = ieee80211_sta_active_ibss(sdata); |
1150 | ||
1151 | if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) { | |
1152 | capability = WLAN_CAPABILITY_IBSS; | |
1153 | ||
1154 | if (ifibss->privacy) | |
1155 | capability |= WLAN_CAPABILITY_PRIVACY; | |
1156 | ||
1157 | cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->channel, | |
1158 | ifibss->bssid, ifibss->ssid, | |
1159 | ifibss->ssid_len, WLAN_CAPABILITY_IBSS | | |
1160 | WLAN_CAPABILITY_PRIVACY, | |
1161 | capability); | |
1162 | ||
1163 | if (cbss) { | |
1164 | cfg80211_unlink_bss(local->hw.wiphy, cbss); | |
1165 | cfg80211_put_bss(cbss); | |
1166 | } | |
1167 | } | |
af8cdcd8 | 1168 | |
af8cdcd8 | 1169 | sta_info_flush(sdata->local, sdata); |
8bf11d8d JB |
1170 | |
1171 | spin_lock_bh(&ifibss->incomplete_lock); | |
1172 | while (!list_empty(&ifibss->incomplete_stations)) { | |
1173 | sta = list_first_entry(&ifibss->incomplete_stations, | |
1174 | struct sta_info, list); | |
1175 | list_del(&sta->list); | |
1176 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1177 | ||
1178 | sta_info_free(local, sta); | |
1179 | spin_lock_bh(&ifibss->incomplete_lock); | |
1180 | } | |
1181 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1182 | ||
86a2ea41 | 1183 | netif_carrier_off(sdata->dev); |
af8cdcd8 JB |
1184 | |
1185 | /* remove beacon */ | |
1186 | kfree(sdata->u.ibss.ie); | |
40b275b6 JB |
1187 | skb = rcu_dereference_protected(sdata->u.ibss.presp, |
1188 | lockdep_is_held(&sdata->u.ibss.mtx)); | |
a9b3cd7f | 1189 | RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); |
8fc214ba | 1190 | sdata->vif.bss_conf.ibss_joined = false; |
c13a765b | 1191 | sdata->vif.bss_conf.ibss_creator = false; |
8fc214ba JB |
1192 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | |
1193 | BSS_CHANGED_IBSS); | |
af8cdcd8 JB |
1194 | synchronize_rcu(); |
1195 | kfree_skb(skb); | |
1196 | ||
35f20c14 | 1197 | skb_queue_purge(&sdata->skb_queue); |
5cff20e6 | 1198 | |
bc05d19f | 1199 | del_timer_sync(&sdata->u.ibss.timer); |
7a17a33c JB |
1200 | |
1201 | mutex_unlock(&sdata->u.ibss.mtx); | |
bc05d19f | 1202 | |
7da7cc1d | 1203 | mutex_lock(&local->mtx); |
5cff20e6 | 1204 | ieee80211_recalc_idle(sdata->local); |
7da7cc1d | 1205 | mutex_unlock(&local->mtx); |
af8cdcd8 JB |
1206 | |
1207 | return 0; | |
1208 | } |