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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 JB |
203 | bss_change |= BSS_CHANGED_IBSS; |
204 | sdata->vif.bss_conf.ibss_joined = true; | |
c13a765b | 205 | sdata->vif.bss_conf.ibss_creator = creator; |
2d0ddec5 | 206 | ieee80211_bss_info_change_notify(sdata, bss_change); |
46900298 | 207 | |
b59066a2 | 208 | ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates); |
46900298 | 209 | |
46900298 | 210 | ifibss->state = IEEE80211_IBSS_MLME_JOINED; |
af8cdcd8 JB |
211 | mod_timer(&ifibss->timer, |
212 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 | 213 | |
273686d6 | 214 | bss = cfg80211_inform_bss_frame(local->hw.wiphy, chan, |
f446d10f JB |
215 | mgmt, skb->len, 0, GFP_KERNEL); |
216 | cfg80211_put_bss(bss); | |
86a2ea41 | 217 | netif_carrier_on(sdata->dev); |
af8cdcd8 | 218 | cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL); |
46900298 JB |
219 | } |
220 | ||
af8cdcd8 JB |
221 | static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
222 | struct ieee80211_bss *bss) | |
46900298 | 223 | { |
0c1ad2ca JB |
224 | struct cfg80211_bss *cbss = |
225 | container_of((void *)bss, struct cfg80211_bss, priv); | |
b59066a2 JB |
226 | struct ieee80211_supported_band *sband; |
227 | u32 basic_rates; | |
228 | int i, j; | |
0c1ad2ca | 229 | u16 beacon_int = cbss->beacon_interval; |
57c4d7b4 | 230 | |
7a17a33c JB |
231 | lockdep_assert_held(&sdata->u.ibss.mtx); |
232 | ||
57c4d7b4 JB |
233 | if (beacon_int < 10) |
234 | beacon_int = 10; | |
235 | ||
0c1ad2ca | 236 | sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; |
b59066a2 JB |
237 | |
238 | basic_rates = 0; | |
239 | ||
240 | for (i = 0; i < bss->supp_rates_len; i++) { | |
241 | int rate = (bss->supp_rates[i] & 0x7f) * 5; | |
242 | bool is_basic = !!(bss->supp_rates[i] & 0x80); | |
243 | ||
244 | for (j = 0; j < sband->n_bitrates; j++) { | |
245 | if (sband->bitrates[j].bitrate == rate) { | |
246 | if (is_basic) | |
247 | basic_rates |= BIT(j); | |
248 | break; | |
249 | } | |
250 | } | |
251 | } | |
252 | ||
0c1ad2ca | 253 | __ieee80211_sta_join_ibss(sdata, cbss->bssid, |
57c4d7b4 | 254 | beacon_int, |
0c1ad2ca | 255 | cbss->channel, |
b59066a2 | 256 | basic_rates, |
0c1ad2ca | 257 | cbss->capability, |
c13a765b SM |
258 | cbss->tsf, |
259 | false); | |
46900298 JB |
260 | } |
261 | ||
6d810f10 AQ |
262 | static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta, |
263 | bool auth) | |
8bf11d8d JB |
264 | __acquires(RCU) |
265 | { | |
266 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
267 | u8 addr[ETH_ALEN]; | |
268 | ||
269 | memcpy(addr, sta->sta.addr, ETH_ALEN); | |
270 | ||
bdcbd8e0 | 271 | ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr); |
8bf11d8d | 272 | |
83d5cc01 JB |
273 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); |
274 | sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); | |
267335d6 AQ |
275 | /* authorize the station only if the network is not RSN protected. If |
276 | * not wait for the userspace to authorize it */ | |
277 | if (!sta->sdata->u.ibss.control_port) | |
278 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); | |
8bf11d8d JB |
279 | |
280 | rate_control_rate_init(sta); | |
281 | ||
282 | /* If it fails, maybe we raced another insertion? */ | |
283 | if (sta_info_insert_rcu(sta)) | |
284 | return sta_info_get(sdata, addr); | |
452a6d22 | 285 | if (auth && !sdata->u.ibss.auth_frame_registrations) { |
bdcbd8e0 JB |
286 | ibss_dbg(sdata, |
287 | "TX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=1)\n", | |
2514ec86 | 288 | sdata->vif.addr, addr, sdata->u.ibss.bssid); |
700e8ea6 | 289 | ieee80211_send_auth(sdata, 1, WLAN_AUTH_OPEN, 0, NULL, 0, |
6d810f10 AQ |
290 | addr, sdata->u.ibss.bssid, NULL, 0, 0); |
291 | } | |
8bf11d8d JB |
292 | return sta; |
293 | } | |
294 | ||
295 | static struct sta_info * | |
296 | ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, | |
297 | const u8 *bssid, const u8 *addr, | |
6d810f10 | 298 | u32 supp_rates, bool auth) |
8bf11d8d JB |
299 | __acquires(RCU) |
300 | { | |
301 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
302 | struct ieee80211_local *local = sdata->local; | |
303 | struct sta_info *sta; | |
55de908a JB |
304 | struct ieee80211_chanctx_conf *chanctx_conf; |
305 | int band; | |
8bf11d8d JB |
306 | |
307 | /* | |
308 | * XXX: Consider removing the least recently used entry and | |
309 | * allow new one to be added. | |
310 | */ | |
311 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { | |
bdcbd8e0 | 312 | net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
e87cc472 | 313 | sdata->name, addr); |
8bf11d8d JB |
314 | rcu_read_lock(); |
315 | return NULL; | |
316 | } | |
317 | ||
318 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { | |
319 | rcu_read_lock(); | |
320 | return NULL; | |
321 | } | |
322 | ||
b203ca39 | 323 | if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) { |
8bf11d8d JB |
324 | rcu_read_lock(); |
325 | return NULL; | |
326 | } | |
327 | ||
55de908a JB |
328 | rcu_read_lock(); |
329 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
330 | if (WARN_ON_ONCE(!chanctx_conf)) | |
331 | return NULL; | |
4bf88530 | 332 | band = chanctx_conf->def.chan->band; |
55de908a JB |
333 | rcu_read_unlock(); |
334 | ||
8bf11d8d JB |
335 | sta = sta_info_alloc(sdata, addr, GFP_KERNEL); |
336 | if (!sta) { | |
337 | rcu_read_lock(); | |
338 | return NULL; | |
339 | } | |
340 | ||
341 | sta->last_rx = jiffies; | |
342 | ||
343 | /* make sure mandatory rates are always added */ | |
344 | sta->sta.supp_rates[band] = supp_rates | | |
345 | ieee80211_mandatory_rates(local, band); | |
346 | ||
6d810f10 AQ |
347 | return ieee80211_ibss_finish_sta(sta, auth); |
348 | } | |
349 | ||
2cc59e78 AQ |
350 | static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata, |
351 | struct ieee80211_mgmt *mgmt, | |
352 | size_t len) | |
353 | { | |
354 | u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code); | |
355 | ||
356 | if (len < IEEE80211_DEAUTH_FRAME_LEN) | |
357 | return; | |
358 | ||
359 | ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n", | |
360 | mgmt->sa, mgmt->da, mgmt->bssid, reason); | |
361 | sta_info_destroy_addr(sdata, mgmt->sa); | |
362 | } | |
363 | ||
6d810f10 AQ |
364 | static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, |
365 | struct ieee80211_mgmt *mgmt, | |
366 | size_t len) | |
367 | { | |
368 | u16 auth_alg, auth_transaction; | |
2cc59e78 AQ |
369 | struct sta_info *sta; |
370 | u8 deauth_frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; | |
6d810f10 AQ |
371 | |
372 | lockdep_assert_held(&sdata->u.ibss.mtx); | |
373 | ||
374 | if (len < 24 + 6) | |
375 | return; | |
376 | ||
377 | auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); | |
378 | auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); | |
379 | ||
bdcbd8e0 JB |
380 | ibss_dbg(sdata, |
381 | "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n", | |
382 | mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction); | |
7bed2050 AQ |
383 | |
384 | if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) | |
385 | return; | |
386 | ||
6d810f10 | 387 | sta_info_destroy_addr(sdata, mgmt->sa); |
2cc59e78 | 388 | sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 0, false); |
6d810f10 AQ |
389 | rcu_read_unlock(); |
390 | ||
2cc59e78 AQ |
391 | /* |
392 | * if we have any problem in allocating the new station, we reply with a | |
393 | * DEAUTH frame to tell the other end that we had a problem | |
394 | */ | |
395 | if (!sta) { | |
396 | ieee80211_send_deauth_disassoc(sdata, sdata->u.ibss.bssid, | |
397 | IEEE80211_STYPE_DEAUTH, | |
398 | WLAN_REASON_UNSPECIFIED, true, | |
399 | deauth_frame_buf); | |
400 | return; | |
401 | } | |
402 | ||
6d810f10 AQ |
403 | /* |
404 | * IEEE 802.11 standard does not require authentication in IBSS | |
405 | * networks and most implementations do not seem to use it. | |
406 | * However, try to reply to authentication attempts if someone | |
407 | * has actually implemented this. | |
408 | */ | |
700e8ea6 | 409 | ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0, |
6d810f10 | 410 | mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0); |
8bf11d8d JB |
411 | } |
412 | ||
46900298 JB |
413 | static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, |
414 | struct ieee80211_mgmt *mgmt, | |
415 | size_t len, | |
416 | struct ieee80211_rx_status *rx_status, | |
417 | struct ieee802_11_elems *elems, | |
418 | bool beacon) | |
419 | { | |
420 | struct ieee80211_local *local = sdata->local; | |
421 | int freq; | |
0c1ad2ca | 422 | struct cfg80211_bss *cbss; |
46900298 JB |
423 | struct ieee80211_bss *bss; |
424 | struct sta_info *sta; | |
425 | struct ieee80211_channel *channel; | |
426 | u64 beacon_timestamp, rx_timestamp; | |
427 | u32 supp_rates = 0; | |
428 | enum ieee80211_band band = rx_status->band; | |
13c40c54 AS |
429 | struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; |
430 | bool rates_updated = false; | |
46900298 JB |
431 | |
432 | if (elems->ds_params && elems->ds_params_len == 1) | |
59eb21a6 BR |
433 | freq = ieee80211_channel_to_frequency(elems->ds_params[0], |
434 | band); | |
46900298 JB |
435 | else |
436 | freq = rx_status->freq; | |
437 | ||
438 | channel = ieee80211_get_channel(local->hw.wiphy, freq); | |
439 | ||
440 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
441 | return; | |
442 | ||
9eba6125 | 443 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC && |
b203ca39 | 444 | ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) { |
46900298 JB |
445 | |
446 | rcu_read_lock(); | |
abe60632 | 447 | sta = sta_info_get(sdata, mgmt->sa); |
46900298 | 448 | |
9eba6125 BR |
449 | if (elems->supp_rates) { |
450 | supp_rates = ieee80211_sta_get_rates(local, elems, | |
9ebb61a2 | 451 | band, NULL); |
9eba6125 BR |
452 | if (sta) { |
453 | u32 prev_rates; | |
454 | ||
455 | prev_rates = sta->sta.supp_rates[band]; | |
456 | /* make sure mandatory rates are always added */ | |
457 | sta->sta.supp_rates[band] = supp_rates | | |
458 | ieee80211_mandatory_rates(local, band); | |
46900298 | 459 | |
9eba6125 | 460 | if (sta->sta.supp_rates[band] != prev_rates) { |
bdcbd8e0 JB |
461 | ibss_dbg(sdata, |
462 | "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", | |
463 | sta->sta.addr, prev_rates, | |
464 | sta->sta.supp_rates[band]); | |
13c40c54 | 465 | rates_updated = true; |
9eba6125 | 466 | } |
8bf11d8d JB |
467 | } else { |
468 | rcu_read_unlock(); | |
9eba6125 | 469 | sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, |
6d810f10 | 470 | mgmt->sa, supp_rates, true); |
8bf11d8d | 471 | } |
34e89507 | 472 | } |
9eba6125 BR |
473 | |
474 | if (sta && elems->wmm_info) | |
c2c98fde | 475 | set_sta_flag(sta, WLAN_STA_WME); |
9eba6125 | 476 | |
074d46d1 | 477 | if (sta && elems->ht_operation && elems->ht_cap_elem && |
13c40c54 AS |
478 | sdata->u.ibss.channel_type != NL80211_CHAN_NO_HT) { |
479 | /* we both use HT */ | |
480 | struct ieee80211_sta_ht_cap sta_ht_cap_new; | |
4bf88530 JB |
481 | struct cfg80211_chan_def chandef; |
482 | ||
483 | ieee80211_ht_oper_to_chandef(channel, | |
484 | elems->ht_operation, | |
485 | &chandef); | |
13c40c54 AS |
486 | |
487 | ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, | |
488 | elems->ht_cap_elem, | |
489 | &sta_ht_cap_new); | |
490 | ||
491 | /* | |
492 | * fall back to HT20 if we don't use or use | |
493 | * the other extension channel | |
494 | */ | |
4bf88530 JB |
495 | if (chandef.width != NL80211_CHAN_WIDTH_40 || |
496 | cfg80211_get_chandef_type(&chandef) != | |
497 | sdata->u.ibss.channel_type) | |
13c40c54 AS |
498 | sta_ht_cap_new.cap &= |
499 | ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; | |
500 | ||
501 | if (memcmp(&sta->sta.ht_cap, &sta_ht_cap_new, | |
502 | sizeof(sta_ht_cap_new))) { | |
503 | memcpy(&sta->sta.ht_cap, &sta_ht_cap_new, | |
504 | sizeof(sta_ht_cap_new)); | |
505 | rates_updated = true; | |
506 | } | |
507 | } | |
508 | ||
e687f61e AQ |
509 | if (sta && rates_updated) { |
510 | drv_sta_rc_update(local, sdata, &sta->sta, | |
511 | IEEE80211_RC_SUPP_RATES_CHANGED); | |
13c40c54 | 512 | rate_control_rate_init(sta); |
e687f61e | 513 | } |
13c40c54 | 514 | |
9eba6125 | 515 | rcu_read_unlock(); |
46900298 JB |
516 | } |
517 | ||
518 | bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, | |
519 | channel, beacon); | |
520 | if (!bss) | |
521 | return; | |
522 | ||
0c1ad2ca JB |
523 | cbss = container_of((void *)bss, struct cfg80211_bss, priv); |
524 | ||
46900298 | 525 | /* was just updated in ieee80211_bss_info_update */ |
0c1ad2ca | 526 | beacon_timestamp = cbss->tsf; |
46900298 JB |
527 | |
528 | /* check if we need to merge IBSS */ | |
529 | ||
46900298 | 530 | /* we use a fixed BSSID */ |
a98bfec2 | 531 | if (sdata->u.ibss.fixed_bssid) |
46900298 JB |
532 | goto put_bss; |
533 | ||
534 | /* not an IBSS */ | |
0c1ad2ca | 535 | if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) |
46900298 JB |
536 | goto put_bss; |
537 | ||
538 | /* different channel */ | |
55de908a JB |
539 | if (sdata->u.ibss.fixed_channel && |
540 | sdata->u.ibss.channel != cbss->channel) | |
46900298 JB |
541 | goto put_bss; |
542 | ||
543 | /* different SSID */ | |
544 | if (elems->ssid_len != sdata->u.ibss.ssid_len || | |
545 | memcmp(elems->ssid, sdata->u.ibss.ssid, | |
546 | sdata->u.ibss.ssid_len)) | |
547 | goto put_bss; | |
548 | ||
34e8f082 | 549 | /* same BSSID */ |
b203ca39 | 550 | if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) |
34e8f082 AF |
551 | goto put_bss; |
552 | ||
f4bda337 TP |
553 | if (ieee80211_have_rx_timestamp(rx_status)) { |
554 | /* time when timestamp field was received */ | |
555 | rx_timestamp = | |
556 | ieee80211_calculate_rx_timestamp(local, rx_status, | |
557 | len + FCS_LEN, 24); | |
24487981 JB |
558 | } else { |
559 | /* | |
560 | * second best option: get current TSF | |
561 | * (will return -1 if not supported) | |
562 | */ | |
37a41b4a | 563 | rx_timestamp = drv_get_tsf(local, sdata); |
24487981 | 564 | } |
46900298 | 565 | |
bdcbd8e0 JB |
566 | ibss_dbg(sdata, |
567 | "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", | |
568 | mgmt->sa, mgmt->bssid, | |
569 | (unsigned long long)rx_timestamp, | |
570 | (unsigned long long)beacon_timestamp, | |
571 | (unsigned long long)(rx_timestamp - beacon_timestamp), | |
572 | jiffies); | |
46900298 JB |
573 | |
574 | if (beacon_timestamp > rx_timestamp) { | |
bdcbd8e0 JB |
575 | ibss_dbg(sdata, |
576 | "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", | |
577 | mgmt->bssid); | |
46900298 | 578 | ieee80211_sta_join_ibss(sdata, bss); |
9ebb61a2 | 579 | supp_rates = ieee80211_sta_get_rates(local, elems, band, NULL); |
34e89507 | 580 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, |
6d810f10 | 581 | supp_rates, true); |
8bf11d8d | 582 | rcu_read_unlock(); |
46900298 JB |
583 | } |
584 | ||
585 | put_bss: | |
586 | ieee80211_rx_bss_put(local, bss); | |
587 | } | |
588 | ||
8bf11d8d JB |
589 | void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, |
590 | const u8 *bssid, const u8 *addr, | |
591 | u32 supp_rates) | |
46900298 | 592 | { |
2e10d330 | 593 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
46900298 JB |
594 | struct ieee80211_local *local = sdata->local; |
595 | struct sta_info *sta; | |
55de908a JB |
596 | struct ieee80211_chanctx_conf *chanctx_conf; |
597 | int band; | |
46900298 | 598 | |
af8cdcd8 JB |
599 | /* |
600 | * XXX: Consider removing the least recently used entry and | |
601 | * allow new one to be added. | |
602 | */ | |
46900298 | 603 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { |
bdcbd8e0 | 604 | net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
e87cc472 | 605 | sdata->name, addr); |
8bf11d8d | 606 | return; |
46900298 JB |
607 | } |
608 | ||
2e10d330 | 609 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) |
8bf11d8d | 610 | return; |
2e10d330 | 611 | |
b203ca39 | 612 | if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) |
8bf11d8d | 613 | return; |
46900298 | 614 | |
55de908a JB |
615 | rcu_read_lock(); |
616 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
617 | if (WARN_ON_ONCE(!chanctx_conf)) { | |
618 | rcu_read_unlock(); | |
619 | return; | |
620 | } | |
4bf88530 | 621 | band = chanctx_conf->def.chan->band; |
55de908a JB |
622 | rcu_read_unlock(); |
623 | ||
8bf11d8d | 624 | sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); |
46900298 | 625 | if (!sta) |
8bf11d8d | 626 | return; |
46900298 | 627 | |
c8716d9d | 628 | sta->last_rx = jiffies; |
d9a7ddb0 | 629 | |
46900298 JB |
630 | /* make sure mandatory rates are always added */ |
631 | sta->sta.supp_rates[band] = supp_rates | | |
632 | ieee80211_mandatory_rates(local, band); | |
633 | ||
8bf11d8d JB |
634 | spin_lock(&ifibss->incomplete_lock); |
635 | list_add(&sta->list, &ifibss->incomplete_stations); | |
636 | spin_unlock(&ifibss->incomplete_lock); | |
637 | ieee80211_queue_work(&local->hw, &sdata->work); | |
46900298 JB |
638 | } |
639 | ||
640 | static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) | |
641 | { | |
642 | struct ieee80211_local *local = sdata->local; | |
643 | int active = 0; | |
644 | struct sta_info *sta; | |
645 | ||
7a17a33c JB |
646 | lockdep_assert_held(&sdata->u.ibss.mtx); |
647 | ||
46900298 JB |
648 | rcu_read_lock(); |
649 | ||
650 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
651 | if (sta->sdata == sdata && | |
652 | time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL, | |
653 | jiffies)) { | |
654 | active++; | |
655 | break; | |
656 | } | |
657 | } | |
658 | ||
659 | rcu_read_unlock(); | |
660 | ||
661 | return active; | |
662 | } | |
663 | ||
ce9058ae BP |
664 | /* |
665 | * This function is called with state == IEEE80211_IBSS_MLME_JOINED | |
666 | */ | |
46900298 JB |
667 | |
668 | static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) | |
669 | { | |
670 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
671 | ||
7a17a33c JB |
672 | lockdep_assert_held(&ifibss->mtx); |
673 | ||
af8cdcd8 JB |
674 | mod_timer(&ifibss->timer, |
675 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 JB |
676 | |
677 | ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT); | |
af8cdcd8 | 678 | |
450aae3d S |
679 | if (time_before(jiffies, ifibss->last_scan_completed + |
680 | IEEE80211_IBSS_MERGE_INTERVAL)) | |
681 | return; | |
682 | ||
46900298 JB |
683 | if (ieee80211_sta_active_ibss(sdata)) |
684 | return; | |
685 | ||
c037b836 | 686 | if (ifibss->fixed_channel) |
46900298 JB |
687 | return; |
688 | ||
bdcbd8e0 JB |
689 | sdata_info(sdata, |
690 | "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); | |
46900298 | 691 | |
be4a4b6a | 692 | ieee80211_request_internal_scan(sdata, |
c037b836 | 693 | ifibss->ssid, ifibss->ssid_len, NULL); |
46900298 JB |
694 | } |
695 | ||
af8cdcd8 | 696 | static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
697 | { |
698 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
46900298 | 699 | u8 bssid[ETH_ALEN]; |
46900298 JB |
700 | u16 capability; |
701 | int i; | |
702 | ||
7a17a33c JB |
703 | lockdep_assert_held(&ifibss->mtx); |
704 | ||
af8cdcd8 | 705 | if (ifibss->fixed_bssid) { |
46900298 JB |
706 | memcpy(bssid, ifibss->bssid, ETH_ALEN); |
707 | } else { | |
708 | /* Generate random, not broadcast, locally administered BSSID. Mix in | |
709 | * own MAC address to make sure that devices that do not have proper | |
710 | * random number generator get different BSSID. */ | |
711 | get_random_bytes(bssid, ETH_ALEN); | |
712 | for (i = 0; i < ETH_ALEN; i++) | |
47846c9b | 713 | bssid[i] ^= sdata->vif.addr[i]; |
46900298 JB |
714 | bssid[0] &= ~0x01; |
715 | bssid[0] |= 0x02; | |
716 | } | |
717 | ||
bdcbd8e0 | 718 | sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); |
46900298 | 719 | |
46900298 JB |
720 | capability = WLAN_CAPABILITY_IBSS; |
721 | ||
fffd0934 | 722 | if (ifibss->privacy) |
46900298 JB |
723 | capability |= WLAN_CAPABILITY_PRIVACY; |
724 | else | |
725 | sdata->drop_unencrypted = 0; | |
726 | ||
57c4d7b4 | 727 | __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, |
fbd2c8dc | 728 | ifibss->channel, ifibss->basic_rates, |
c13a765b | 729 | capability, 0, true); |
46900298 JB |
730 | } |
731 | ||
ce9058ae BP |
732 | /* |
733 | * This function is called with state == IEEE80211_IBSS_MLME_SEARCH | |
734 | */ | |
735 | ||
af8cdcd8 | 736 | static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
737 | { |
738 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
739 | struct ieee80211_local *local = sdata->local; | |
0c1ad2ca | 740 | struct cfg80211_bss *cbss; |
af8cdcd8 | 741 | struct ieee80211_channel *chan = NULL; |
46900298 JB |
742 | const u8 *bssid = NULL; |
743 | int active_ibss; | |
e0d61887 | 744 | u16 capability; |
46900298 | 745 | |
7a17a33c JB |
746 | lockdep_assert_held(&ifibss->mtx); |
747 | ||
46900298 | 748 | active_ibss = ieee80211_sta_active_ibss(sdata); |
bdcbd8e0 | 749 | ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); |
46900298 JB |
750 | |
751 | if (active_ibss) | |
af8cdcd8 | 752 | return; |
46900298 | 753 | |
e0d61887 | 754 | capability = WLAN_CAPABILITY_IBSS; |
fffd0934 | 755 | if (ifibss->privacy) |
e0d61887 | 756 | capability |= WLAN_CAPABILITY_PRIVACY; |
af8cdcd8 JB |
757 | if (ifibss->fixed_bssid) |
758 | bssid = ifibss->bssid; | |
759 | if (ifibss->fixed_channel) | |
760 | chan = ifibss->channel; | |
761 | if (!is_zero_ether_addr(ifibss->bssid)) | |
46900298 | 762 | bssid = ifibss->bssid; |
0c1ad2ca JB |
763 | cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, |
764 | ifibss->ssid, ifibss->ssid_len, | |
765 | WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY, | |
766 | capability); | |
767 | ||
768 | if (cbss) { | |
769 | struct ieee80211_bss *bss; | |
46900298 | 770 | |
0c1ad2ca | 771 | bss = (void *)cbss->priv; |
bdcbd8e0 JB |
772 | ibss_dbg(sdata, |
773 | "sta_find_ibss: selected %pM current %pM\n", | |
774 | cbss->bssid, ifibss->bssid); | |
775 | sdata_info(sdata, | |
776 | "Selected IBSS BSSID %pM based on configured SSID\n", | |
777 | cbss->bssid); | |
46900298 | 778 | |
af8cdcd8 | 779 | ieee80211_sta_join_ibss(sdata, bss); |
46900298 | 780 | ieee80211_rx_bss_put(local, bss); |
af8cdcd8 | 781 | return; |
d419b9f0 | 782 | } |
46900298 | 783 | |
bdcbd8e0 | 784 | ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); |
46900298 JB |
785 | |
786 | /* Selected IBSS not found in current scan results - try to scan */ | |
ce9058ae | 787 | if (time_after(jiffies, ifibss->last_scan_completed + |
46900298 | 788 | IEEE80211_SCAN_INTERVAL)) { |
bdcbd8e0 | 789 | sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); |
46900298 | 790 | |
be4a4b6a JB |
791 | ieee80211_request_internal_scan(sdata, |
792 | ifibss->ssid, ifibss->ssid_len, | |
793 | ifibss->fixed_channel ? ifibss->channel : NULL); | |
ce9058ae | 794 | } else { |
46900298 JB |
795 | int interval = IEEE80211_SCAN_INTERVAL; |
796 | ||
797 | if (time_after(jiffies, ifibss->ibss_join_req + | |
55de908a JB |
798 | IEEE80211_IBSS_JOIN_TIMEOUT)) |
799 | ieee80211_sta_create_ibss(sdata); | |
46900298 | 800 | |
af8cdcd8 JB |
801 | mod_timer(&ifibss->timer, |
802 | round_jiffies(jiffies + interval)); | |
46900298 | 803 | } |
46900298 JB |
804 | } |
805 | ||
806 | static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, | |
c269a203 | 807 | struct sk_buff *req) |
46900298 | 808 | { |
c269a203 | 809 | struct ieee80211_mgmt *mgmt = (void *)req->data; |
46900298 JB |
810 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
811 | struct ieee80211_local *local = sdata->local; | |
c269a203 | 812 | int tx_last_beacon, len = req->len; |
46900298 JB |
813 | struct sk_buff *skb; |
814 | struct ieee80211_mgmt *resp; | |
40b275b6 | 815 | struct sk_buff *presp; |
46900298 JB |
816 | u8 *pos, *end; |
817 | ||
7a17a33c JB |
818 | lockdep_assert_held(&ifibss->mtx); |
819 | ||
40b275b6 JB |
820 | presp = rcu_dereference_protected(ifibss->presp, |
821 | lockdep_is_held(&ifibss->mtx)); | |
822 | ||
46900298 | 823 | if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || |
40b275b6 | 824 | len < 24 + 2 || !presp) |
46900298 JB |
825 | return; |
826 | ||
24487981 | 827 | tx_last_beacon = drv_tx_last_beacon(local); |
46900298 | 828 | |
bdcbd8e0 JB |
829 | ibss_dbg(sdata, |
830 | "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n", | |
831 | mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon); | |
46900298 | 832 | |
1ed76487 | 833 | if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) |
46900298 JB |
834 | return; |
835 | ||
b203ca39 | 836 | if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && |
888d04df | 837 | !is_broadcast_ether_addr(mgmt->bssid)) |
46900298 JB |
838 | return; |
839 | ||
840 | end = ((u8 *) mgmt) + len; | |
841 | pos = mgmt->u.probe_req.variable; | |
842 | if (pos[0] != WLAN_EID_SSID || | |
843 | pos + 2 + pos[1] > end) { | |
bdcbd8e0 JB |
844 | ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", |
845 | mgmt->sa); | |
46900298 JB |
846 | return; |
847 | } | |
848 | if (pos[1] != 0 && | |
849 | (pos[1] != ifibss->ssid_len || | |
0da780c2 | 850 | memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { |
46900298 JB |
851 | /* Ignore ProbeReq for foreign SSID */ |
852 | return; | |
853 | } | |
854 | ||
855 | /* Reply with ProbeResp */ | |
40b275b6 | 856 | skb = skb_copy(presp, GFP_KERNEL); |
46900298 JB |
857 | if (!skb) |
858 | return; | |
859 | ||
860 | resp = (struct ieee80211_mgmt *) skb->data; | |
861 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
bdcbd8e0 | 862 | ibss_dbg(sdata, "Sending ProbeResp to %pM\n", resp->da); |
62ae67be JB |
863 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
864 | ieee80211_tx_skb(sdata, skb); | |
46900298 JB |
865 | } |
866 | ||
867 | static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, | |
868 | struct ieee80211_mgmt *mgmt, | |
869 | size_t len, | |
870 | struct ieee80211_rx_status *rx_status) | |
871 | { | |
872 | size_t baselen; | |
873 | struct ieee802_11_elems elems; | |
874 | ||
46900298 JB |
875 | baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; |
876 | if (baselen > len) | |
877 | return; | |
878 | ||
879 | ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, | |
880 | &elems); | |
881 | ||
882 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); | |
883 | } | |
884 | ||
885 | static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, | |
886 | struct ieee80211_mgmt *mgmt, | |
887 | size_t len, | |
888 | struct ieee80211_rx_status *rx_status) | |
889 | { | |
890 | size_t baselen; | |
891 | struct ieee802_11_elems elems; | |
892 | ||
893 | /* Process beacon from the current BSS */ | |
894 | baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; | |
895 | if (baselen > len) | |
896 | return; | |
897 | ||
898 | ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems); | |
899 | ||
900 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true); | |
901 | } | |
902 | ||
1fa57d01 JB |
903 | void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, |
904 | struct sk_buff *skb) | |
46900298 JB |
905 | { |
906 | struct ieee80211_rx_status *rx_status; | |
907 | struct ieee80211_mgmt *mgmt; | |
908 | u16 fc; | |
909 | ||
f1d58c25 | 910 | rx_status = IEEE80211_SKB_RXCB(skb); |
46900298 JB |
911 | mgmt = (struct ieee80211_mgmt *) skb->data; |
912 | fc = le16_to_cpu(mgmt->frame_control); | |
913 | ||
7a17a33c JB |
914 | mutex_lock(&sdata->u.ibss.mtx); |
915 | ||
c926d006 TH |
916 | if (!sdata->u.ibss.ssid_len) |
917 | goto mgmt_out; /* not ready to merge yet */ | |
918 | ||
46900298 JB |
919 | switch (fc & IEEE80211_FCTL_STYPE) { |
920 | case IEEE80211_STYPE_PROBE_REQ: | |
c269a203 | 921 | ieee80211_rx_mgmt_probe_req(sdata, skb); |
46900298 JB |
922 | break; |
923 | case IEEE80211_STYPE_PROBE_RESP: | |
924 | ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, | |
925 | rx_status); | |
926 | break; | |
927 | case IEEE80211_STYPE_BEACON: | |
928 | ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, | |
929 | rx_status); | |
930 | break; | |
931 | case IEEE80211_STYPE_AUTH: | |
932 | ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); | |
933 | break; | |
2cc59e78 AQ |
934 | case IEEE80211_STYPE_DEAUTH: |
935 | ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); | |
936 | break; | |
46900298 | 937 | } |
7a17a33c | 938 | |
c926d006 | 939 | mgmt_out: |
7a17a33c | 940 | mutex_unlock(&sdata->u.ibss.mtx); |
46900298 JB |
941 | } |
942 | ||
1fa57d01 | 943 | void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) |
46900298 | 944 | { |
1fa57d01 | 945 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
8bf11d8d | 946 | struct sta_info *sta; |
46900298 | 947 | |
7a17a33c JB |
948 | mutex_lock(&ifibss->mtx); |
949 | ||
950 | /* | |
951 | * Work could be scheduled after scan or similar | |
952 | * when we aren't even joined (or trying) with a | |
953 | * network. | |
954 | */ | |
955 | if (!ifibss->ssid_len) | |
956 | goto out; | |
46900298 | 957 | |
8bf11d8d JB |
958 | spin_lock_bh(&ifibss->incomplete_lock); |
959 | while (!list_empty(&ifibss->incomplete_stations)) { | |
960 | sta = list_first_entry(&ifibss->incomplete_stations, | |
961 | struct sta_info, list); | |
962 | list_del(&sta->list); | |
963 | spin_unlock_bh(&ifibss->incomplete_lock); | |
964 | ||
6d810f10 | 965 | ieee80211_ibss_finish_sta(sta, true); |
8bf11d8d JB |
966 | rcu_read_unlock(); |
967 | spin_lock_bh(&ifibss->incomplete_lock); | |
968 | } | |
969 | spin_unlock_bh(&ifibss->incomplete_lock); | |
970 | ||
46900298 JB |
971 | switch (ifibss->state) { |
972 | case IEEE80211_IBSS_MLME_SEARCH: | |
973 | ieee80211_sta_find_ibss(sdata); | |
974 | break; | |
975 | case IEEE80211_IBSS_MLME_JOINED: | |
976 | ieee80211_sta_merge_ibss(sdata); | |
977 | break; | |
978 | default: | |
979 | WARN_ON(1); | |
980 | break; | |
981 | } | |
46900298 | 982 | |
7a17a33c JB |
983 | out: |
984 | mutex_unlock(&ifibss->mtx); | |
3a4d4aa2 JB |
985 | } |
986 | ||
46900298 JB |
987 | static void ieee80211_ibss_timer(unsigned long data) |
988 | { | |
989 | struct ieee80211_sub_if_data *sdata = | |
990 | (struct ieee80211_sub_if_data *) data; | |
991 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
992 | struct ieee80211_local *local = sdata->local; | |
993 | ||
5bb644a0 JB |
994 | if (local->quiescing) { |
995 | ifibss->timer_running = true; | |
996 | return; | |
997 | } | |
998 | ||
7a17a33c | 999 | ieee80211_queue_work(&local->hw, &sdata->work); |
46900298 JB |
1000 | } |
1001 | ||
5bb644a0 JB |
1002 | #ifdef CONFIG_PM |
1003 | void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata) | |
1004 | { | |
1005 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1006 | ||
5bb644a0 JB |
1007 | if (del_timer_sync(&ifibss->timer)) |
1008 | ifibss->timer_running = true; | |
1009 | } | |
1010 | ||
1011 | void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata) | |
1012 | { | |
1013 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1014 | ||
1015 | if (ifibss->timer_running) { | |
1016 | add_timer(&ifibss->timer); | |
1017 | ifibss->timer_running = false; | |
1018 | } | |
1019 | } | |
1020 | #endif | |
1021 | ||
46900298 JB |
1022 | void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) |
1023 | { | |
1024 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1025 | ||
46900298 JB |
1026 | setup_timer(&ifibss->timer, ieee80211_ibss_timer, |
1027 | (unsigned long) sdata); | |
7a17a33c | 1028 | mutex_init(&ifibss->mtx); |
8bf11d8d JB |
1029 | INIT_LIST_HEAD(&ifibss->incomplete_stations); |
1030 | spin_lock_init(&ifibss->incomplete_lock); | |
46900298 JB |
1031 | } |
1032 | ||
1033 | /* scan finished notification */ | |
1034 | void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) | |
1035 | { | |
af8cdcd8 | 1036 | struct ieee80211_sub_if_data *sdata; |
46900298 | 1037 | |
29b4a4f7 JB |
1038 | mutex_lock(&local->iflist_mtx); |
1039 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 1040 | if (!ieee80211_sdata_running(sdata)) |
0e41f715 | 1041 | continue; |
af8cdcd8 JB |
1042 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
1043 | continue; | |
1044 | sdata->u.ibss.last_scan_completed = jiffies; | |
7a17a33c | 1045 | ieee80211_queue_work(&local->hw, &sdata->work); |
46900298 | 1046 | } |
29b4a4f7 | 1047 | mutex_unlock(&local->iflist_mtx); |
46900298 JB |
1048 | } |
1049 | ||
af8cdcd8 JB |
1050 | int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, |
1051 | struct cfg80211_ibss_params *params) | |
1052 | { | |
1053 | struct sk_buff *skb; | |
ff3cc5f4 | 1054 | u32 changed = 0; |
af8cdcd8 | 1055 | |
7a17a33c | 1056 | skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + |
13c40c54 AS |
1057 | sizeof(struct ieee80211_hdr_3addr) + |
1058 | 12 /* struct ieee80211_mgmt.u.beacon */ + | |
1059 | 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ + | |
1060 | 2 + 8 /* max Supported Rates */ + | |
1061 | 3 /* max DS params */ + | |
1062 | 4 /* IBSS params */ + | |
1063 | 2 + (IEEE80211_MAX_SUPP_RATES - 8) + | |
1064 | 2 + sizeof(struct ieee80211_ht_cap) + | |
074d46d1 | 1065 | 2 + sizeof(struct ieee80211_ht_operation) + |
7a17a33c JB |
1066 | params->ie_len); |
1067 | if (!skb) | |
1068 | return -ENOMEM; | |
1069 | ||
1070 | mutex_lock(&sdata->u.ibss.mtx); | |
1071 | ||
af8cdcd8 JB |
1072 | if (params->bssid) { |
1073 | memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); | |
1074 | sdata->u.ibss.fixed_bssid = true; | |
1075 | } else | |
1076 | sdata->u.ibss.fixed_bssid = false; | |
1077 | ||
fffd0934 | 1078 | sdata->u.ibss.privacy = params->privacy; |
267335d6 | 1079 | sdata->u.ibss.control_port = params->control_port; |
fbd2c8dc | 1080 | sdata->u.ibss.basic_rates = params->basic_rates; |
dd5b4cc7 FF |
1081 | memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, |
1082 | sizeof(params->mcast_rate)); | |
fffd0934 | 1083 | |
57c4d7b4 JB |
1084 | sdata->vif.bss_conf.beacon_int = params->beacon_interval; |
1085 | ||
683b6d3b JB |
1086 | sdata->u.ibss.channel = params->chandef.chan; |
1087 | sdata->u.ibss.channel_type = | |
1088 | cfg80211_get_chandef_type(¶ms->chandef); | |
af8cdcd8 JB |
1089 | sdata->u.ibss.fixed_channel = params->channel_fixed; |
1090 | ||
1091 | if (params->ie) { | |
1092 | sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, | |
1093 | GFP_KERNEL); | |
1094 | if (sdata->u.ibss.ie) | |
1095 | sdata->u.ibss.ie_len = params->ie_len; | |
1096 | } | |
1097 | ||
af8cdcd8 JB |
1098 | sdata->u.ibss.skb = skb; |
1099 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; | |
1100 | sdata->u.ibss.ibss_join_req = jiffies; | |
1101 | ||
badecb00 | 1102 | memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); |
0e41f715 JB |
1103 | sdata->u.ibss.ssid_len = params->ssid_len; |
1104 | ||
7da7cc1d JB |
1105 | mutex_unlock(&sdata->u.ibss.mtx); |
1106 | ||
1107 | mutex_lock(&sdata->local->mtx); | |
5cff20e6 | 1108 | ieee80211_recalc_idle(sdata->local); |
7da7cc1d | 1109 | mutex_unlock(&sdata->local->mtx); |
5cff20e6 | 1110 | |
ff3cc5f4 SW |
1111 | /* |
1112 | * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is | |
1113 | * reserved, but an HT STA shall protect HT transmissions as though | |
1114 | * the HT Protection field were set to non-HT mixed mode. | |
1115 | * | |
1116 | * In an IBSS, the RIFS Mode field of the HT Operation element is | |
1117 | * also reserved, but an HT STA shall operate as though this field | |
1118 | * were set to 1. | |
1119 | */ | |
1120 | ||
1121 | sdata->vif.bss_conf.ht_operation_mode |= | |
1122 | IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | |
1123 | | IEEE80211_HT_PARAM_RIFS_MODE; | |
1124 | ||
1125 | changed |= BSS_CHANGED_HT; | |
1126 | ieee80211_bss_info_change_notify(sdata, changed); | |
1127 | ||
04ecd257 JB |
1128 | sdata->smps_mode = IEEE80211_SMPS_OFF; |
1129 | sdata->needed_rx_chains = sdata->local->rx_chains; | |
1130 | ||
64592c8f | 1131 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
af8cdcd8 JB |
1132 | |
1133 | return 0; | |
1134 | } | |
1135 | ||
1136 | int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) | |
1137 | { | |
1138 | struct sk_buff *skb; | |
5ea096c0 TP |
1139 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
1140 | struct ieee80211_local *local = sdata->local; | |
1141 | struct cfg80211_bss *cbss; | |
1142 | u16 capability; | |
7a17a33c | 1143 | int active_ibss; |
8bf11d8d | 1144 | struct sta_info *sta; |
7a17a33c JB |
1145 | |
1146 | mutex_lock(&sdata->u.ibss.mtx); | |
5ea096c0 | 1147 | |
f3209bea JB |
1148 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; |
1149 | memset(sdata->u.ibss.bssid, 0, ETH_ALEN); | |
1150 | sdata->u.ibss.ssid_len = 0; | |
1151 | ||
5ea096c0 TP |
1152 | active_ibss = ieee80211_sta_active_ibss(sdata); |
1153 | ||
1154 | if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) { | |
1155 | capability = WLAN_CAPABILITY_IBSS; | |
1156 | ||
1157 | if (ifibss->privacy) | |
1158 | capability |= WLAN_CAPABILITY_PRIVACY; | |
1159 | ||
1160 | cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->channel, | |
1161 | ifibss->bssid, ifibss->ssid, | |
1162 | ifibss->ssid_len, WLAN_CAPABILITY_IBSS | | |
1163 | WLAN_CAPABILITY_PRIVACY, | |
1164 | capability); | |
1165 | ||
1166 | if (cbss) { | |
1167 | cfg80211_unlink_bss(local->hw.wiphy, cbss); | |
1168 | cfg80211_put_bss(cbss); | |
1169 | } | |
1170 | } | |
af8cdcd8 | 1171 | |
af8cdcd8 | 1172 | sta_info_flush(sdata->local, sdata); |
8bf11d8d JB |
1173 | |
1174 | spin_lock_bh(&ifibss->incomplete_lock); | |
1175 | while (!list_empty(&ifibss->incomplete_stations)) { | |
1176 | sta = list_first_entry(&ifibss->incomplete_stations, | |
1177 | struct sta_info, list); | |
1178 | list_del(&sta->list); | |
1179 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1180 | ||
1181 | sta_info_free(local, sta); | |
1182 | spin_lock_bh(&ifibss->incomplete_lock); | |
1183 | } | |
1184 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1185 | ||
86a2ea41 | 1186 | netif_carrier_off(sdata->dev); |
af8cdcd8 JB |
1187 | |
1188 | /* remove beacon */ | |
1189 | kfree(sdata->u.ibss.ie); | |
40b275b6 JB |
1190 | skb = rcu_dereference_protected(sdata->u.ibss.presp, |
1191 | lockdep_is_held(&sdata->u.ibss.mtx)); | |
a9b3cd7f | 1192 | RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); |
8fc214ba | 1193 | sdata->vif.bss_conf.ibss_joined = false; |
c13a765b | 1194 | sdata->vif.bss_conf.ibss_creator = false; |
8fc214ba JB |
1195 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | |
1196 | BSS_CHANGED_IBSS); | |
af8cdcd8 JB |
1197 | synchronize_rcu(); |
1198 | kfree_skb(skb); | |
1199 | ||
35f20c14 | 1200 | skb_queue_purge(&sdata->skb_queue); |
5cff20e6 | 1201 | |
bc05d19f | 1202 | del_timer_sync(&sdata->u.ibss.timer); |
7a17a33c JB |
1203 | |
1204 | mutex_unlock(&sdata->u.ibss.mtx); | |
bc05d19f | 1205 | |
7da7cc1d | 1206 | mutex_lock(&local->mtx); |
5cff20e6 | 1207 | ieee80211_recalc_idle(sdata->local); |
7da7cc1d | 1208 | mutex_unlock(&local->mtx); |
af8cdcd8 JB |
1209 | |
1210 | return 0; | |
1211 | } |