Commit | Line | Data |
---|---|---|
46900298 JB |
1 | /* |
2 | * IBSS mode implementation | |
3 | * Copyright 2003-2008, Jouni Malinen <j@w1.fi> | |
4 | * Copyright 2004, Instant802 Networks, Inc. | |
5 | * Copyright 2005, Devicescape Software, Inc. | |
6 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
7 | * Copyright 2007, Michael Wu <flamingice@sourmilk.net> | |
8 | * Copyright 2009, Johannes Berg <johannes@sipsolutions.net> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
13 | */ | |
14 | ||
15 | #include <linux/delay.h> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
46900298 JB |
17 | #include <linux/if_ether.h> |
18 | #include <linux/skbuff.h> | |
19 | #include <linux/if_arp.h> | |
20 | #include <linux/etherdevice.h> | |
21 | #include <linux/rtnetlink.h> | |
22 | #include <net/mac80211.h> | |
46900298 JB |
23 | |
24 | #include "ieee80211_i.h" | |
24487981 | 25 | #include "driver-ops.h" |
46900298 JB |
26 | #include "rate.h" |
27 | ||
28 | #define IEEE80211_SCAN_INTERVAL (2 * HZ) | |
46900298 JB |
29 | #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ) |
30 | ||
31 | #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ) | |
32 | #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ) | |
33 | ||
34 | #define IEEE80211_IBSS_MAX_STA_ENTRIES 128 | |
35 | ||
36 | ||
af8cdcd8 JB |
37 | static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
38 | const u8 *bssid, const int beacon_int, | |
39 | struct ieee80211_channel *chan, | |
b59066a2 | 40 | const u32 basic_rates, |
af8cdcd8 | 41 | const u16 capability, u64 tsf) |
46900298 JB |
42 | { |
43 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
44 | struct ieee80211_local *local = sdata->local; | |
b59066a2 | 45 | int rates, i; |
46900298 JB |
46 | struct sk_buff *skb; |
47 | struct ieee80211_mgmt *mgmt; | |
48 | u8 *pos; | |
49 | struct ieee80211_supported_band *sband; | |
f446d10f | 50 | struct cfg80211_bss *bss; |
57c4d7b4 | 51 | u32 bss_change; |
b59066a2 | 52 | u8 supp_rates[IEEE80211_MAX_SUPP_RATES]; |
13c40c54 | 53 | enum nl80211_channel_type channel_type; |
24487981 | 54 | |
7a17a33c JB |
55 | lockdep_assert_held(&ifibss->mtx); |
56 | ||
24487981 | 57 | /* Reset own TSF to allow time synchronization work. */ |
37a41b4a | 58 | drv_reset_tsf(local, sdata); |
46900298 | 59 | |
af8cdcd8 | 60 | skb = ifibss->skb; |
a9b3cd7f | 61 | RCU_INIT_POINTER(ifibss->presp, NULL); |
af8cdcd8 JB |
62 | synchronize_rcu(); |
63 | skb->data = skb->head; | |
64 | skb->len = 0; | |
65 | skb_reset_tail_pointer(skb); | |
66 | skb_reserve(skb, sdata->local->hw.extra_tx_headroom); | |
46900298 | 67 | |
b203ca39 | 68 | if (!ether_addr_equal(ifibss->bssid, bssid)) |
af8cdcd8 | 69 | sta_info_flush(sdata->local, sdata); |
46900298 | 70 | |
49b5c7f4 JB |
71 | /* if merging, indicate to driver that we leave the old IBSS */ |
72 | if (sdata->vif.bss_conf.ibss_joined) { | |
73 | sdata->vif.bss_conf.ibss_joined = false; | |
86a2ea41 | 74 | netif_carrier_off(sdata->dev); |
49b5c7f4 JB |
75 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IBSS); |
76 | } | |
77 | ||
af8cdcd8 | 78 | sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0; |
46900298 | 79 | |
13c40c54 | 80 | channel_type = ifibss->channel_type; |
d58e7e37 | 81 | if (!cfg80211_can_beacon_sec_chan(local->hw.wiphy, chan, channel_type)) |
13c40c54 | 82 | channel_type = NL80211_CHAN_HT20; |
55de908a JB |
83 | |
84 | ieee80211_vif_release_channel(sdata); | |
85 | if (ieee80211_vif_use_channel(sdata, chan, channel_type, | |
86 | ifibss->fixed_channel ? | |
87 | IEEE80211_CHANCTX_SHARED : | |
88 | IEEE80211_CHANCTX_EXCLUSIVE)) { | |
89 | sdata_info(sdata, "Failed to join IBSS, no channel context\n"); | |
90 | return; | |
13c40c54 | 91 | } |
55de908a JB |
92 | |
93 | memcpy(ifibss->bssid, bssid, ETH_ALEN); | |
57c4d7b4 | 94 | |
af8cdcd8 | 95 | sband = local->hw.wiphy->bands[chan->band]; |
46900298 | 96 | |
b59066a2 JB |
97 | /* build supported rates array */ |
98 | pos = supp_rates; | |
99 | for (i = 0; i < sband->n_bitrates; i++) { | |
100 | int rate = sband->bitrates[i].bitrate; | |
101 | u8 basic = 0; | |
102 | if (basic_rates & BIT(i)) | |
103 | basic = 0x80; | |
104 | *pos++ = basic | (u8) (rate / 5); | |
105 | } | |
106 | ||
46900298 | 107 | /* Build IBSS probe response */ |
af8cdcd8 | 108 | mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon)); |
46900298 JB |
109 | memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon)); |
110 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | | |
111 | IEEE80211_STYPE_PROBE_RESP); | |
e83e6541 | 112 | eth_broadcast_addr(mgmt->da); |
47846c9b | 113 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
46900298 | 114 | memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN); |
57c4d7b4 | 115 | mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int); |
707c1b4e | 116 | mgmt->u.beacon.timestamp = cpu_to_le64(tsf); |
46900298 JB |
117 | mgmt->u.beacon.capab_info = cpu_to_le16(capability); |
118 | ||
119 | pos = skb_put(skb, 2 + ifibss->ssid_len); | |
120 | *pos++ = WLAN_EID_SSID; | |
121 | *pos++ = ifibss->ssid_len; | |
122 | memcpy(pos, ifibss->ssid, ifibss->ssid_len); | |
123 | ||
b59066a2 | 124 | rates = sband->n_bitrates; |
46900298 JB |
125 | if (rates > 8) |
126 | rates = 8; | |
127 | pos = skb_put(skb, 2 + rates); | |
128 | *pos++ = WLAN_EID_SUPP_RATES; | |
129 | *pos++ = rates; | |
130 | memcpy(pos, supp_rates, rates); | |
131 | ||
132 | if (sband->band == IEEE80211_BAND_2GHZ) { | |
133 | pos = skb_put(skb, 2 + 1); | |
134 | *pos++ = WLAN_EID_DS_PARAMS; | |
135 | *pos++ = 1; | |
af8cdcd8 | 136 | *pos++ = ieee80211_frequency_to_channel(chan->center_freq); |
46900298 JB |
137 | } |
138 | ||
139 | pos = skb_put(skb, 2 + 2); | |
140 | *pos++ = WLAN_EID_IBSS_PARAMS; | |
141 | *pos++ = 2; | |
142 | /* FIX: set ATIM window based on scan results */ | |
143 | *pos++ = 0; | |
144 | *pos++ = 0; | |
145 | ||
b59066a2 JB |
146 | if (sband->n_bitrates > 8) { |
147 | rates = sband->n_bitrates - 8; | |
46900298 JB |
148 | pos = skb_put(skb, 2 + rates); |
149 | *pos++ = WLAN_EID_EXT_SUPP_RATES; | |
150 | *pos++ = rates; | |
151 | memcpy(pos, &supp_rates[8], rates); | |
152 | } | |
153 | ||
af8cdcd8 JB |
154 | if (ifibss->ie_len) |
155 | memcpy(skb_put(skb, ifibss->ie_len), | |
156 | ifibss->ie, ifibss->ie_len); | |
157 | ||
13c40c54 AS |
158 | /* add HT capability and information IEs */ |
159 | if (channel_type && sband->ht_cap.ht_supported) { | |
160 | pos = skb_put(skb, 4 + | |
161 | sizeof(struct ieee80211_ht_cap) + | |
074d46d1 | 162 | sizeof(struct ieee80211_ht_operation)); |
13c40c54 AS |
163 | pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, |
164 | sband->ht_cap.cap); | |
0d894ec5 AN |
165 | /* |
166 | * Note: According to 802.11n-2009 9.13.3.1, HT Protection | |
167 | * field and RIFS Mode are reserved in IBSS mode, therefore | |
168 | * keep them at 0 | |
169 | */ | |
074d46d1 | 170 | pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap, |
431e3154 | 171 | chan, channel_type, 0); |
13c40c54 AS |
172 | } |
173 | ||
32c5057b | 174 | if (local->hw.queues >= IEEE80211_NUM_ACS) { |
9eba6125 BR |
175 | pos = skb_put(skb, 9); |
176 | *pos++ = WLAN_EID_VENDOR_SPECIFIC; | |
177 | *pos++ = 7; /* len */ | |
178 | *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */ | |
179 | *pos++ = 0x50; | |
180 | *pos++ = 0xf2; | |
181 | *pos++ = 2; /* WME */ | |
182 | *pos++ = 0; /* WME info */ | |
183 | *pos++ = 1; /* WME ver */ | |
184 | *pos++ = 0; /* U-APSD no in use */ | |
185 | } | |
186 | ||
cf778b00 | 187 | rcu_assign_pointer(ifibss->presp, skb); |
46900298 | 188 | |
2d0ddec5 | 189 | sdata->vif.bss_conf.beacon_int = beacon_int; |
fbd2c8dc | 190 | sdata->vif.bss_conf.basic_rates = basic_rates; |
2d0ddec5 JB |
191 | bss_change = BSS_CHANGED_BEACON_INT; |
192 | bss_change |= ieee80211_reset_erp_info(sdata); | |
193 | bss_change |= BSS_CHANGED_BSSID; | |
194 | bss_change |= BSS_CHANGED_BEACON; | |
195 | bss_change |= BSS_CHANGED_BEACON_ENABLED; | |
392cfdb1 | 196 | bss_change |= BSS_CHANGED_BASIC_RATES; |
13c40c54 | 197 | bss_change |= BSS_CHANGED_HT; |
8fc214ba JB |
198 | bss_change |= BSS_CHANGED_IBSS; |
199 | sdata->vif.bss_conf.ibss_joined = true; | |
2d0ddec5 | 200 | ieee80211_bss_info_change_notify(sdata, bss_change); |
46900298 | 201 | |
b59066a2 | 202 | ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates); |
46900298 | 203 | |
46900298 | 204 | ifibss->state = IEEE80211_IBSS_MLME_JOINED; |
af8cdcd8 JB |
205 | mod_timer(&ifibss->timer, |
206 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 | 207 | |
273686d6 | 208 | bss = cfg80211_inform_bss_frame(local->hw.wiphy, chan, |
f446d10f JB |
209 | mgmt, skb->len, 0, GFP_KERNEL); |
210 | cfg80211_put_bss(bss); | |
86a2ea41 | 211 | netif_carrier_on(sdata->dev); |
af8cdcd8 | 212 | cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL); |
46900298 JB |
213 | } |
214 | ||
af8cdcd8 JB |
215 | static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
216 | struct ieee80211_bss *bss) | |
46900298 | 217 | { |
0c1ad2ca JB |
218 | struct cfg80211_bss *cbss = |
219 | container_of((void *)bss, struct cfg80211_bss, priv); | |
b59066a2 JB |
220 | struct ieee80211_supported_band *sband; |
221 | u32 basic_rates; | |
222 | int i, j; | |
0c1ad2ca | 223 | u16 beacon_int = cbss->beacon_interval; |
57c4d7b4 | 224 | |
7a17a33c JB |
225 | lockdep_assert_held(&sdata->u.ibss.mtx); |
226 | ||
57c4d7b4 JB |
227 | if (beacon_int < 10) |
228 | beacon_int = 10; | |
229 | ||
0c1ad2ca | 230 | sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; |
b59066a2 JB |
231 | |
232 | basic_rates = 0; | |
233 | ||
234 | for (i = 0; i < bss->supp_rates_len; i++) { | |
235 | int rate = (bss->supp_rates[i] & 0x7f) * 5; | |
236 | bool is_basic = !!(bss->supp_rates[i] & 0x80); | |
237 | ||
238 | for (j = 0; j < sband->n_bitrates; j++) { | |
239 | if (sband->bitrates[j].bitrate == rate) { | |
240 | if (is_basic) | |
241 | basic_rates |= BIT(j); | |
242 | break; | |
243 | } | |
244 | } | |
245 | } | |
246 | ||
0c1ad2ca | 247 | __ieee80211_sta_join_ibss(sdata, cbss->bssid, |
57c4d7b4 | 248 | beacon_int, |
0c1ad2ca | 249 | cbss->channel, |
b59066a2 | 250 | basic_rates, |
0c1ad2ca JB |
251 | cbss->capability, |
252 | cbss->tsf); | |
46900298 JB |
253 | } |
254 | ||
6d810f10 AQ |
255 | static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta, |
256 | bool auth) | |
8bf11d8d JB |
257 | __acquires(RCU) |
258 | { | |
259 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
260 | u8 addr[ETH_ALEN]; | |
261 | ||
262 | memcpy(addr, sta->sta.addr, ETH_ALEN); | |
263 | ||
bdcbd8e0 | 264 | ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr); |
8bf11d8d | 265 | |
83d5cc01 JB |
266 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); |
267 | sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); | |
267335d6 AQ |
268 | /* authorize the station only if the network is not RSN protected. If |
269 | * not wait for the userspace to authorize it */ | |
270 | if (!sta->sdata->u.ibss.control_port) | |
271 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); | |
8bf11d8d JB |
272 | |
273 | rate_control_rate_init(sta); | |
274 | ||
275 | /* If it fails, maybe we raced another insertion? */ | |
276 | if (sta_info_insert_rcu(sta)) | |
277 | return sta_info_get(sdata, addr); | |
452a6d22 | 278 | if (auth && !sdata->u.ibss.auth_frame_registrations) { |
bdcbd8e0 JB |
279 | ibss_dbg(sdata, |
280 | "TX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=1)\n", | |
2514ec86 | 281 | sdata->vif.addr, addr, sdata->u.ibss.bssid); |
6d810f10 AQ |
282 | ieee80211_send_auth(sdata, 1, WLAN_AUTH_OPEN, NULL, 0, |
283 | addr, sdata->u.ibss.bssid, NULL, 0, 0); | |
284 | } | |
8bf11d8d JB |
285 | return sta; |
286 | } | |
287 | ||
288 | static struct sta_info * | |
289 | ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, | |
290 | const u8 *bssid, const u8 *addr, | |
6d810f10 | 291 | u32 supp_rates, bool auth) |
8bf11d8d JB |
292 | __acquires(RCU) |
293 | { | |
294 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
295 | struct ieee80211_local *local = sdata->local; | |
296 | struct sta_info *sta; | |
55de908a JB |
297 | struct ieee80211_chanctx_conf *chanctx_conf; |
298 | int band; | |
8bf11d8d JB |
299 | |
300 | /* | |
301 | * XXX: Consider removing the least recently used entry and | |
302 | * allow new one to be added. | |
303 | */ | |
304 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { | |
bdcbd8e0 | 305 | net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
e87cc472 | 306 | sdata->name, addr); |
8bf11d8d JB |
307 | rcu_read_lock(); |
308 | return NULL; | |
309 | } | |
310 | ||
311 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { | |
312 | rcu_read_lock(); | |
313 | return NULL; | |
314 | } | |
315 | ||
b203ca39 | 316 | if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) { |
8bf11d8d JB |
317 | rcu_read_lock(); |
318 | return NULL; | |
319 | } | |
320 | ||
55de908a JB |
321 | rcu_read_lock(); |
322 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
323 | if (WARN_ON_ONCE(!chanctx_conf)) | |
324 | return NULL; | |
325 | band = chanctx_conf->channel->band; | |
326 | rcu_read_unlock(); | |
327 | ||
8bf11d8d JB |
328 | sta = sta_info_alloc(sdata, addr, GFP_KERNEL); |
329 | if (!sta) { | |
330 | rcu_read_lock(); | |
331 | return NULL; | |
332 | } | |
333 | ||
334 | sta->last_rx = jiffies; | |
335 | ||
336 | /* make sure mandatory rates are always added */ | |
337 | sta->sta.supp_rates[band] = supp_rates | | |
338 | ieee80211_mandatory_rates(local, band); | |
339 | ||
6d810f10 AQ |
340 | return ieee80211_ibss_finish_sta(sta, auth); |
341 | } | |
342 | ||
2cc59e78 AQ |
343 | static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata, |
344 | struct ieee80211_mgmt *mgmt, | |
345 | size_t len) | |
346 | { | |
347 | u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code); | |
348 | ||
349 | if (len < IEEE80211_DEAUTH_FRAME_LEN) | |
350 | return; | |
351 | ||
352 | ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n", | |
353 | mgmt->sa, mgmt->da, mgmt->bssid, reason); | |
354 | sta_info_destroy_addr(sdata, mgmt->sa); | |
355 | } | |
356 | ||
6d810f10 AQ |
357 | static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, |
358 | struct ieee80211_mgmt *mgmt, | |
359 | size_t len) | |
360 | { | |
361 | u16 auth_alg, auth_transaction; | |
2cc59e78 AQ |
362 | struct sta_info *sta; |
363 | u8 deauth_frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; | |
6d810f10 AQ |
364 | |
365 | lockdep_assert_held(&sdata->u.ibss.mtx); | |
366 | ||
367 | if (len < 24 + 6) | |
368 | return; | |
369 | ||
370 | auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); | |
371 | auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); | |
372 | ||
373 | if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) | |
374 | return; | |
bdcbd8e0 JB |
375 | ibss_dbg(sdata, |
376 | "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n", | |
377 | mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction); | |
6d810f10 | 378 | sta_info_destroy_addr(sdata, mgmt->sa); |
2cc59e78 | 379 | sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 0, false); |
6d810f10 AQ |
380 | rcu_read_unlock(); |
381 | ||
2cc59e78 AQ |
382 | /* |
383 | * if we have any problem in allocating the new station, we reply with a | |
384 | * DEAUTH frame to tell the other end that we had a problem | |
385 | */ | |
386 | if (!sta) { | |
387 | ieee80211_send_deauth_disassoc(sdata, sdata->u.ibss.bssid, | |
388 | IEEE80211_STYPE_DEAUTH, | |
389 | WLAN_REASON_UNSPECIFIED, true, | |
390 | deauth_frame_buf); | |
391 | return; | |
392 | } | |
393 | ||
6d810f10 AQ |
394 | /* |
395 | * IEEE 802.11 standard does not require authentication in IBSS | |
396 | * networks and most implementations do not seem to use it. | |
397 | * However, try to reply to authentication attempts if someone | |
398 | * has actually implemented this. | |
399 | */ | |
400 | ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, NULL, 0, | |
401 | mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0); | |
8bf11d8d JB |
402 | } |
403 | ||
46900298 JB |
404 | static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, |
405 | struct ieee80211_mgmt *mgmt, | |
406 | size_t len, | |
407 | struct ieee80211_rx_status *rx_status, | |
408 | struct ieee802_11_elems *elems, | |
409 | bool beacon) | |
410 | { | |
411 | struct ieee80211_local *local = sdata->local; | |
412 | int freq; | |
0c1ad2ca | 413 | struct cfg80211_bss *cbss; |
46900298 JB |
414 | struct ieee80211_bss *bss; |
415 | struct sta_info *sta; | |
416 | struct ieee80211_channel *channel; | |
417 | u64 beacon_timestamp, rx_timestamp; | |
418 | u32 supp_rates = 0; | |
419 | enum ieee80211_band band = rx_status->band; | |
13c40c54 AS |
420 | struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; |
421 | bool rates_updated = false; | |
46900298 JB |
422 | |
423 | if (elems->ds_params && elems->ds_params_len == 1) | |
59eb21a6 BR |
424 | freq = ieee80211_channel_to_frequency(elems->ds_params[0], |
425 | band); | |
46900298 JB |
426 | else |
427 | freq = rx_status->freq; | |
428 | ||
429 | channel = ieee80211_get_channel(local->hw.wiphy, freq); | |
430 | ||
431 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
432 | return; | |
433 | ||
9eba6125 | 434 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC && |
b203ca39 | 435 | ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) { |
46900298 JB |
436 | |
437 | rcu_read_lock(); | |
abe60632 | 438 | sta = sta_info_get(sdata, mgmt->sa); |
46900298 | 439 | |
9eba6125 BR |
440 | if (elems->supp_rates) { |
441 | supp_rates = ieee80211_sta_get_rates(local, elems, | |
9ebb61a2 | 442 | band, NULL); |
9eba6125 BR |
443 | if (sta) { |
444 | u32 prev_rates; | |
445 | ||
446 | prev_rates = sta->sta.supp_rates[band]; | |
447 | /* make sure mandatory rates are always added */ | |
448 | sta->sta.supp_rates[band] = supp_rates | | |
449 | ieee80211_mandatory_rates(local, band); | |
46900298 | 450 | |
9eba6125 | 451 | if (sta->sta.supp_rates[band] != prev_rates) { |
bdcbd8e0 JB |
452 | ibss_dbg(sdata, |
453 | "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", | |
454 | sta->sta.addr, prev_rates, | |
455 | sta->sta.supp_rates[band]); | |
13c40c54 | 456 | rates_updated = true; |
9eba6125 | 457 | } |
8bf11d8d JB |
458 | } else { |
459 | rcu_read_unlock(); | |
9eba6125 | 460 | sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, |
6d810f10 | 461 | mgmt->sa, supp_rates, true); |
8bf11d8d | 462 | } |
34e89507 | 463 | } |
9eba6125 BR |
464 | |
465 | if (sta && elems->wmm_info) | |
c2c98fde | 466 | set_sta_flag(sta, WLAN_STA_WME); |
9eba6125 | 467 | |
074d46d1 | 468 | if (sta && elems->ht_operation && elems->ht_cap_elem && |
13c40c54 AS |
469 | sdata->u.ibss.channel_type != NL80211_CHAN_NO_HT) { |
470 | /* we both use HT */ | |
471 | struct ieee80211_sta_ht_cap sta_ht_cap_new; | |
472 | enum nl80211_channel_type channel_type = | |
074d46d1 JB |
473 | ieee80211_ht_oper_to_channel_type( |
474 | elems->ht_operation); | |
13c40c54 AS |
475 | |
476 | ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, | |
477 | elems->ht_cap_elem, | |
478 | &sta_ht_cap_new); | |
479 | ||
480 | /* | |
481 | * fall back to HT20 if we don't use or use | |
482 | * the other extension channel | |
483 | */ | |
6741e7f0 FF |
484 | if (!(channel_type == NL80211_CHAN_HT40MINUS || |
485 | channel_type == NL80211_CHAN_HT40PLUS) || | |
13c40c54 AS |
486 | channel_type != sdata->u.ibss.channel_type) |
487 | sta_ht_cap_new.cap &= | |
488 | ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; | |
489 | ||
490 | if (memcmp(&sta->sta.ht_cap, &sta_ht_cap_new, | |
491 | sizeof(sta_ht_cap_new))) { | |
492 | memcpy(&sta->sta.ht_cap, &sta_ht_cap_new, | |
493 | sizeof(sta_ht_cap_new)); | |
494 | rates_updated = true; | |
495 | } | |
496 | } | |
497 | ||
e687f61e AQ |
498 | if (sta && rates_updated) { |
499 | drv_sta_rc_update(local, sdata, &sta->sta, | |
500 | IEEE80211_RC_SUPP_RATES_CHANGED); | |
13c40c54 | 501 | rate_control_rate_init(sta); |
e687f61e | 502 | } |
13c40c54 | 503 | |
9eba6125 | 504 | rcu_read_unlock(); |
46900298 JB |
505 | } |
506 | ||
507 | bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, | |
508 | channel, beacon); | |
509 | if (!bss) | |
510 | return; | |
511 | ||
0c1ad2ca JB |
512 | cbss = container_of((void *)bss, struct cfg80211_bss, priv); |
513 | ||
46900298 | 514 | /* was just updated in ieee80211_bss_info_update */ |
0c1ad2ca | 515 | beacon_timestamp = cbss->tsf; |
46900298 JB |
516 | |
517 | /* check if we need to merge IBSS */ | |
518 | ||
46900298 | 519 | /* we use a fixed BSSID */ |
a98bfec2 | 520 | if (sdata->u.ibss.fixed_bssid) |
46900298 JB |
521 | goto put_bss; |
522 | ||
523 | /* not an IBSS */ | |
0c1ad2ca | 524 | if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) |
46900298 JB |
525 | goto put_bss; |
526 | ||
527 | /* different channel */ | |
55de908a JB |
528 | if (sdata->u.ibss.fixed_channel && |
529 | sdata->u.ibss.channel != cbss->channel) | |
46900298 JB |
530 | goto put_bss; |
531 | ||
532 | /* different SSID */ | |
533 | if (elems->ssid_len != sdata->u.ibss.ssid_len || | |
534 | memcmp(elems->ssid, sdata->u.ibss.ssid, | |
535 | sdata->u.ibss.ssid_len)) | |
536 | goto put_bss; | |
537 | ||
34e8f082 | 538 | /* same BSSID */ |
b203ca39 | 539 | if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) |
34e8f082 AF |
540 | goto put_bss; |
541 | ||
6ebacbb7 | 542 | if (rx_status->flag & RX_FLAG_MACTIME_MPDU) { |
46900298 JB |
543 | /* |
544 | * For correct IBSS merging we need mactime; since mactime is | |
545 | * defined as the time the first data symbol of the frame hits | |
546 | * the PHY, and the timestamp of the beacon is defined as "the | |
547 | * time that the data symbol containing the first bit of the | |
548 | * timestamp is transmitted to the PHY plus the transmitting | |
549 | * STA's delays through its local PHY from the MAC-PHY | |
550 | * interface to its interface with the WM" (802.11 11.1.2) | |
551 | * - equals the time this bit arrives at the receiver - we have | |
552 | * to take into account the offset between the two. | |
553 | * | |
554 | * E.g. at 1 MBit that means mactime is 192 usec earlier | |
555 | * (=24 bytes * 8 usecs/byte) than the beacon timestamp. | |
556 | */ | |
557 | int rate; | |
558 | ||
559 | if (rx_status->flag & RX_FLAG_HT) | |
560 | rate = 65; /* TODO: HT rates */ | |
561 | else | |
562 | rate = local->hw.wiphy->bands[band]-> | |
563 | bitrates[rx_status->rate_idx].bitrate; | |
564 | ||
565 | rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate); | |
24487981 JB |
566 | } else { |
567 | /* | |
568 | * second best option: get current TSF | |
569 | * (will return -1 if not supported) | |
570 | */ | |
37a41b4a | 571 | rx_timestamp = drv_get_tsf(local, sdata); |
24487981 | 572 | } |
46900298 | 573 | |
bdcbd8e0 JB |
574 | ibss_dbg(sdata, |
575 | "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", | |
576 | mgmt->sa, mgmt->bssid, | |
577 | (unsigned long long)rx_timestamp, | |
578 | (unsigned long long)beacon_timestamp, | |
579 | (unsigned long long)(rx_timestamp - beacon_timestamp), | |
580 | jiffies); | |
46900298 JB |
581 | |
582 | if (beacon_timestamp > rx_timestamp) { | |
bdcbd8e0 JB |
583 | ibss_dbg(sdata, |
584 | "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", | |
585 | mgmt->bssid); | |
46900298 | 586 | ieee80211_sta_join_ibss(sdata, bss); |
9ebb61a2 | 587 | supp_rates = ieee80211_sta_get_rates(local, elems, band, NULL); |
34e89507 | 588 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, |
6d810f10 | 589 | supp_rates, true); |
8bf11d8d | 590 | rcu_read_unlock(); |
46900298 JB |
591 | } |
592 | ||
593 | put_bss: | |
594 | ieee80211_rx_bss_put(local, bss); | |
595 | } | |
596 | ||
8bf11d8d JB |
597 | void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, |
598 | const u8 *bssid, const u8 *addr, | |
599 | u32 supp_rates) | |
46900298 | 600 | { |
2e10d330 | 601 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
46900298 JB |
602 | struct ieee80211_local *local = sdata->local; |
603 | struct sta_info *sta; | |
55de908a JB |
604 | struct ieee80211_chanctx_conf *chanctx_conf; |
605 | int band; | |
46900298 | 606 | |
af8cdcd8 JB |
607 | /* |
608 | * XXX: Consider removing the least recently used entry and | |
609 | * allow new one to be added. | |
610 | */ | |
46900298 | 611 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { |
bdcbd8e0 | 612 | net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
e87cc472 | 613 | sdata->name, addr); |
8bf11d8d | 614 | return; |
46900298 JB |
615 | } |
616 | ||
2e10d330 | 617 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) |
8bf11d8d | 618 | return; |
2e10d330 | 619 | |
b203ca39 | 620 | if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) |
8bf11d8d | 621 | return; |
46900298 | 622 | |
55de908a JB |
623 | rcu_read_lock(); |
624 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
625 | if (WARN_ON_ONCE(!chanctx_conf)) { | |
626 | rcu_read_unlock(); | |
627 | return; | |
628 | } | |
629 | band = chanctx_conf->channel->band; | |
630 | rcu_read_unlock(); | |
631 | ||
8bf11d8d | 632 | sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); |
46900298 | 633 | if (!sta) |
8bf11d8d | 634 | return; |
46900298 | 635 | |
c8716d9d | 636 | sta->last_rx = jiffies; |
d9a7ddb0 | 637 | |
46900298 JB |
638 | /* make sure mandatory rates are always added */ |
639 | sta->sta.supp_rates[band] = supp_rates | | |
640 | ieee80211_mandatory_rates(local, band); | |
641 | ||
8bf11d8d JB |
642 | spin_lock(&ifibss->incomplete_lock); |
643 | list_add(&sta->list, &ifibss->incomplete_stations); | |
644 | spin_unlock(&ifibss->incomplete_lock); | |
645 | ieee80211_queue_work(&local->hw, &sdata->work); | |
46900298 JB |
646 | } |
647 | ||
648 | static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) | |
649 | { | |
650 | struct ieee80211_local *local = sdata->local; | |
651 | int active = 0; | |
652 | struct sta_info *sta; | |
653 | ||
7a17a33c JB |
654 | lockdep_assert_held(&sdata->u.ibss.mtx); |
655 | ||
46900298 JB |
656 | rcu_read_lock(); |
657 | ||
658 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
659 | if (sta->sdata == sdata && | |
660 | time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL, | |
661 | jiffies)) { | |
662 | active++; | |
663 | break; | |
664 | } | |
665 | } | |
666 | ||
667 | rcu_read_unlock(); | |
668 | ||
669 | return active; | |
670 | } | |
671 | ||
ce9058ae BP |
672 | /* |
673 | * This function is called with state == IEEE80211_IBSS_MLME_JOINED | |
674 | */ | |
46900298 JB |
675 | |
676 | static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) | |
677 | { | |
678 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
679 | ||
7a17a33c JB |
680 | lockdep_assert_held(&ifibss->mtx); |
681 | ||
af8cdcd8 JB |
682 | mod_timer(&ifibss->timer, |
683 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 JB |
684 | |
685 | ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT); | |
af8cdcd8 | 686 | |
450aae3d S |
687 | if (time_before(jiffies, ifibss->last_scan_completed + |
688 | IEEE80211_IBSS_MERGE_INTERVAL)) | |
689 | return; | |
690 | ||
46900298 JB |
691 | if (ieee80211_sta_active_ibss(sdata)) |
692 | return; | |
693 | ||
c037b836 | 694 | if (ifibss->fixed_channel) |
46900298 JB |
695 | return; |
696 | ||
bdcbd8e0 JB |
697 | sdata_info(sdata, |
698 | "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); | |
46900298 | 699 | |
be4a4b6a | 700 | ieee80211_request_internal_scan(sdata, |
c037b836 | 701 | ifibss->ssid, ifibss->ssid_len, NULL); |
46900298 JB |
702 | } |
703 | ||
af8cdcd8 | 704 | static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
705 | { |
706 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
46900298 | 707 | u8 bssid[ETH_ALEN]; |
46900298 JB |
708 | u16 capability; |
709 | int i; | |
710 | ||
7a17a33c JB |
711 | lockdep_assert_held(&ifibss->mtx); |
712 | ||
af8cdcd8 | 713 | if (ifibss->fixed_bssid) { |
46900298 JB |
714 | memcpy(bssid, ifibss->bssid, ETH_ALEN); |
715 | } else { | |
716 | /* Generate random, not broadcast, locally administered BSSID. Mix in | |
717 | * own MAC address to make sure that devices that do not have proper | |
718 | * random number generator get different BSSID. */ | |
719 | get_random_bytes(bssid, ETH_ALEN); | |
720 | for (i = 0; i < ETH_ALEN; i++) | |
47846c9b | 721 | bssid[i] ^= sdata->vif.addr[i]; |
46900298 JB |
722 | bssid[0] &= ~0x01; |
723 | bssid[0] |= 0x02; | |
724 | } | |
725 | ||
bdcbd8e0 | 726 | sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); |
46900298 | 727 | |
46900298 JB |
728 | capability = WLAN_CAPABILITY_IBSS; |
729 | ||
fffd0934 | 730 | if (ifibss->privacy) |
46900298 JB |
731 | capability |= WLAN_CAPABILITY_PRIVACY; |
732 | else | |
733 | sdata->drop_unencrypted = 0; | |
734 | ||
57c4d7b4 | 735 | __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, |
fbd2c8dc | 736 | ifibss->channel, ifibss->basic_rates, |
b59066a2 | 737 | capability, 0); |
46900298 JB |
738 | } |
739 | ||
ce9058ae BP |
740 | /* |
741 | * This function is called with state == IEEE80211_IBSS_MLME_SEARCH | |
742 | */ | |
743 | ||
af8cdcd8 | 744 | static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
745 | { |
746 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
747 | struct ieee80211_local *local = sdata->local; | |
0c1ad2ca | 748 | struct cfg80211_bss *cbss; |
af8cdcd8 | 749 | struct ieee80211_channel *chan = NULL; |
46900298 JB |
750 | const u8 *bssid = NULL; |
751 | int active_ibss; | |
e0d61887 | 752 | u16 capability; |
46900298 | 753 | |
7a17a33c JB |
754 | lockdep_assert_held(&ifibss->mtx); |
755 | ||
46900298 | 756 | active_ibss = ieee80211_sta_active_ibss(sdata); |
bdcbd8e0 | 757 | ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); |
46900298 JB |
758 | |
759 | if (active_ibss) | |
af8cdcd8 | 760 | return; |
46900298 | 761 | |
e0d61887 | 762 | capability = WLAN_CAPABILITY_IBSS; |
fffd0934 | 763 | if (ifibss->privacy) |
e0d61887 | 764 | capability |= WLAN_CAPABILITY_PRIVACY; |
af8cdcd8 JB |
765 | if (ifibss->fixed_bssid) |
766 | bssid = ifibss->bssid; | |
767 | if (ifibss->fixed_channel) | |
768 | chan = ifibss->channel; | |
769 | if (!is_zero_ether_addr(ifibss->bssid)) | |
46900298 | 770 | bssid = ifibss->bssid; |
0c1ad2ca JB |
771 | cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, |
772 | ifibss->ssid, ifibss->ssid_len, | |
773 | WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY, | |
774 | capability); | |
775 | ||
776 | if (cbss) { | |
777 | struct ieee80211_bss *bss; | |
46900298 | 778 | |
0c1ad2ca | 779 | bss = (void *)cbss->priv; |
bdcbd8e0 JB |
780 | ibss_dbg(sdata, |
781 | "sta_find_ibss: selected %pM current %pM\n", | |
782 | cbss->bssid, ifibss->bssid); | |
783 | sdata_info(sdata, | |
784 | "Selected IBSS BSSID %pM based on configured SSID\n", | |
785 | cbss->bssid); | |
46900298 | 786 | |
af8cdcd8 | 787 | ieee80211_sta_join_ibss(sdata, bss); |
46900298 | 788 | ieee80211_rx_bss_put(local, bss); |
af8cdcd8 | 789 | return; |
d419b9f0 | 790 | } |
46900298 | 791 | |
bdcbd8e0 | 792 | ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); |
46900298 JB |
793 | |
794 | /* Selected IBSS not found in current scan results - try to scan */ | |
ce9058ae | 795 | if (time_after(jiffies, ifibss->last_scan_completed + |
46900298 | 796 | IEEE80211_SCAN_INTERVAL)) { |
bdcbd8e0 | 797 | sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); |
46900298 | 798 | |
be4a4b6a JB |
799 | ieee80211_request_internal_scan(sdata, |
800 | ifibss->ssid, ifibss->ssid_len, | |
801 | ifibss->fixed_channel ? ifibss->channel : NULL); | |
ce9058ae | 802 | } else { |
46900298 JB |
803 | int interval = IEEE80211_SCAN_INTERVAL; |
804 | ||
805 | if (time_after(jiffies, ifibss->ibss_join_req + | |
55de908a JB |
806 | IEEE80211_IBSS_JOIN_TIMEOUT)) |
807 | ieee80211_sta_create_ibss(sdata); | |
46900298 | 808 | |
af8cdcd8 JB |
809 | mod_timer(&ifibss->timer, |
810 | round_jiffies(jiffies + interval)); | |
46900298 | 811 | } |
46900298 JB |
812 | } |
813 | ||
814 | static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, | |
c269a203 | 815 | struct sk_buff *req) |
46900298 | 816 | { |
c269a203 | 817 | struct ieee80211_mgmt *mgmt = (void *)req->data; |
46900298 JB |
818 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
819 | struct ieee80211_local *local = sdata->local; | |
c269a203 | 820 | int tx_last_beacon, len = req->len; |
46900298 JB |
821 | struct sk_buff *skb; |
822 | struct ieee80211_mgmt *resp; | |
40b275b6 | 823 | struct sk_buff *presp; |
46900298 JB |
824 | u8 *pos, *end; |
825 | ||
7a17a33c JB |
826 | lockdep_assert_held(&ifibss->mtx); |
827 | ||
40b275b6 JB |
828 | presp = rcu_dereference_protected(ifibss->presp, |
829 | lockdep_is_held(&ifibss->mtx)); | |
830 | ||
46900298 | 831 | if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || |
40b275b6 | 832 | len < 24 + 2 || !presp) |
46900298 JB |
833 | return; |
834 | ||
24487981 | 835 | tx_last_beacon = drv_tx_last_beacon(local); |
46900298 | 836 | |
bdcbd8e0 JB |
837 | ibss_dbg(sdata, |
838 | "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n", | |
839 | mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon); | |
46900298 | 840 | |
1ed76487 | 841 | if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) |
46900298 JB |
842 | return; |
843 | ||
b203ca39 | 844 | if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && |
888d04df | 845 | !is_broadcast_ether_addr(mgmt->bssid)) |
46900298 JB |
846 | return; |
847 | ||
848 | end = ((u8 *) mgmt) + len; | |
849 | pos = mgmt->u.probe_req.variable; | |
850 | if (pos[0] != WLAN_EID_SSID || | |
851 | pos + 2 + pos[1] > end) { | |
bdcbd8e0 JB |
852 | ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", |
853 | mgmt->sa); | |
46900298 JB |
854 | return; |
855 | } | |
856 | if (pos[1] != 0 && | |
857 | (pos[1] != ifibss->ssid_len || | |
0da780c2 | 858 | memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { |
46900298 JB |
859 | /* Ignore ProbeReq for foreign SSID */ |
860 | return; | |
861 | } | |
862 | ||
863 | /* Reply with ProbeResp */ | |
40b275b6 | 864 | skb = skb_copy(presp, GFP_KERNEL); |
46900298 JB |
865 | if (!skb) |
866 | return; | |
867 | ||
868 | resp = (struct ieee80211_mgmt *) skb->data; | |
869 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
bdcbd8e0 | 870 | ibss_dbg(sdata, "Sending ProbeResp to %pM\n", resp->da); |
62ae67be JB |
871 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
872 | ieee80211_tx_skb(sdata, skb); | |
46900298 JB |
873 | } |
874 | ||
875 | static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, | |
876 | struct ieee80211_mgmt *mgmt, | |
877 | size_t len, | |
878 | struct ieee80211_rx_status *rx_status) | |
879 | { | |
880 | size_t baselen; | |
881 | struct ieee802_11_elems elems; | |
882 | ||
46900298 JB |
883 | baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; |
884 | if (baselen > len) | |
885 | return; | |
886 | ||
887 | ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, | |
888 | &elems); | |
889 | ||
890 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); | |
891 | } | |
892 | ||
893 | static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, | |
894 | struct ieee80211_mgmt *mgmt, | |
895 | size_t len, | |
896 | struct ieee80211_rx_status *rx_status) | |
897 | { | |
898 | size_t baselen; | |
899 | struct ieee802_11_elems elems; | |
900 | ||
901 | /* Process beacon from the current BSS */ | |
902 | baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; | |
903 | if (baselen > len) | |
904 | return; | |
905 | ||
906 | ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems); | |
907 | ||
908 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true); | |
909 | } | |
910 | ||
1fa57d01 JB |
911 | void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, |
912 | struct sk_buff *skb) | |
46900298 JB |
913 | { |
914 | struct ieee80211_rx_status *rx_status; | |
915 | struct ieee80211_mgmt *mgmt; | |
916 | u16 fc; | |
917 | ||
f1d58c25 | 918 | rx_status = IEEE80211_SKB_RXCB(skb); |
46900298 JB |
919 | mgmt = (struct ieee80211_mgmt *) skb->data; |
920 | fc = le16_to_cpu(mgmt->frame_control); | |
921 | ||
7a17a33c JB |
922 | mutex_lock(&sdata->u.ibss.mtx); |
923 | ||
c926d006 TH |
924 | if (!sdata->u.ibss.ssid_len) |
925 | goto mgmt_out; /* not ready to merge yet */ | |
926 | ||
46900298 JB |
927 | switch (fc & IEEE80211_FCTL_STYPE) { |
928 | case IEEE80211_STYPE_PROBE_REQ: | |
c269a203 | 929 | ieee80211_rx_mgmt_probe_req(sdata, skb); |
46900298 JB |
930 | break; |
931 | case IEEE80211_STYPE_PROBE_RESP: | |
932 | ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, | |
933 | rx_status); | |
934 | break; | |
935 | case IEEE80211_STYPE_BEACON: | |
936 | ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, | |
937 | rx_status); | |
938 | break; | |
939 | case IEEE80211_STYPE_AUTH: | |
940 | ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); | |
941 | break; | |
2cc59e78 AQ |
942 | case IEEE80211_STYPE_DEAUTH: |
943 | ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); | |
944 | break; | |
46900298 | 945 | } |
7a17a33c | 946 | |
c926d006 | 947 | mgmt_out: |
7a17a33c | 948 | mutex_unlock(&sdata->u.ibss.mtx); |
46900298 JB |
949 | } |
950 | ||
1fa57d01 | 951 | void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) |
46900298 | 952 | { |
1fa57d01 | 953 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
8bf11d8d | 954 | struct sta_info *sta; |
46900298 | 955 | |
7a17a33c JB |
956 | mutex_lock(&ifibss->mtx); |
957 | ||
958 | /* | |
959 | * Work could be scheduled after scan or similar | |
960 | * when we aren't even joined (or trying) with a | |
961 | * network. | |
962 | */ | |
963 | if (!ifibss->ssid_len) | |
964 | goto out; | |
46900298 | 965 | |
8bf11d8d JB |
966 | spin_lock_bh(&ifibss->incomplete_lock); |
967 | while (!list_empty(&ifibss->incomplete_stations)) { | |
968 | sta = list_first_entry(&ifibss->incomplete_stations, | |
969 | struct sta_info, list); | |
970 | list_del(&sta->list); | |
971 | spin_unlock_bh(&ifibss->incomplete_lock); | |
972 | ||
6d810f10 | 973 | ieee80211_ibss_finish_sta(sta, true); |
8bf11d8d JB |
974 | rcu_read_unlock(); |
975 | spin_lock_bh(&ifibss->incomplete_lock); | |
976 | } | |
977 | spin_unlock_bh(&ifibss->incomplete_lock); | |
978 | ||
46900298 JB |
979 | switch (ifibss->state) { |
980 | case IEEE80211_IBSS_MLME_SEARCH: | |
981 | ieee80211_sta_find_ibss(sdata); | |
982 | break; | |
983 | case IEEE80211_IBSS_MLME_JOINED: | |
984 | ieee80211_sta_merge_ibss(sdata); | |
985 | break; | |
986 | default: | |
987 | WARN_ON(1); | |
988 | break; | |
989 | } | |
46900298 | 990 | |
7a17a33c JB |
991 | out: |
992 | mutex_unlock(&ifibss->mtx); | |
3a4d4aa2 JB |
993 | } |
994 | ||
46900298 JB |
995 | static void ieee80211_ibss_timer(unsigned long data) |
996 | { | |
997 | struct ieee80211_sub_if_data *sdata = | |
998 | (struct ieee80211_sub_if_data *) data; | |
999 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1000 | struct ieee80211_local *local = sdata->local; | |
1001 | ||
5bb644a0 JB |
1002 | if (local->quiescing) { |
1003 | ifibss->timer_running = true; | |
1004 | return; | |
1005 | } | |
1006 | ||
7a17a33c | 1007 | ieee80211_queue_work(&local->hw, &sdata->work); |
46900298 JB |
1008 | } |
1009 | ||
5bb644a0 JB |
1010 | #ifdef CONFIG_PM |
1011 | void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata) | |
1012 | { | |
1013 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1014 | ||
5bb644a0 JB |
1015 | if (del_timer_sync(&ifibss->timer)) |
1016 | ifibss->timer_running = true; | |
1017 | } | |
1018 | ||
1019 | void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata) | |
1020 | { | |
1021 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1022 | ||
1023 | if (ifibss->timer_running) { | |
1024 | add_timer(&ifibss->timer); | |
1025 | ifibss->timer_running = false; | |
1026 | } | |
1027 | } | |
1028 | #endif | |
1029 | ||
46900298 JB |
1030 | void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) |
1031 | { | |
1032 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1033 | ||
46900298 JB |
1034 | setup_timer(&ifibss->timer, ieee80211_ibss_timer, |
1035 | (unsigned long) sdata); | |
7a17a33c | 1036 | mutex_init(&ifibss->mtx); |
8bf11d8d JB |
1037 | INIT_LIST_HEAD(&ifibss->incomplete_stations); |
1038 | spin_lock_init(&ifibss->incomplete_lock); | |
46900298 JB |
1039 | } |
1040 | ||
1041 | /* scan finished notification */ | |
1042 | void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) | |
1043 | { | |
af8cdcd8 | 1044 | struct ieee80211_sub_if_data *sdata; |
46900298 | 1045 | |
29b4a4f7 JB |
1046 | mutex_lock(&local->iflist_mtx); |
1047 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 1048 | if (!ieee80211_sdata_running(sdata)) |
0e41f715 | 1049 | continue; |
af8cdcd8 JB |
1050 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
1051 | continue; | |
1052 | sdata->u.ibss.last_scan_completed = jiffies; | |
7a17a33c | 1053 | ieee80211_queue_work(&local->hw, &sdata->work); |
46900298 | 1054 | } |
29b4a4f7 | 1055 | mutex_unlock(&local->iflist_mtx); |
46900298 JB |
1056 | } |
1057 | ||
af8cdcd8 JB |
1058 | int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, |
1059 | struct cfg80211_ibss_params *params) | |
1060 | { | |
1061 | struct sk_buff *skb; | |
ff3cc5f4 | 1062 | u32 changed = 0; |
af8cdcd8 | 1063 | |
7a17a33c | 1064 | skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + |
13c40c54 AS |
1065 | sizeof(struct ieee80211_hdr_3addr) + |
1066 | 12 /* struct ieee80211_mgmt.u.beacon */ + | |
1067 | 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ + | |
1068 | 2 + 8 /* max Supported Rates */ + | |
1069 | 3 /* max DS params */ + | |
1070 | 4 /* IBSS params */ + | |
1071 | 2 + (IEEE80211_MAX_SUPP_RATES - 8) + | |
1072 | 2 + sizeof(struct ieee80211_ht_cap) + | |
074d46d1 | 1073 | 2 + sizeof(struct ieee80211_ht_operation) + |
7a17a33c JB |
1074 | params->ie_len); |
1075 | if (!skb) | |
1076 | return -ENOMEM; | |
1077 | ||
1078 | mutex_lock(&sdata->u.ibss.mtx); | |
1079 | ||
af8cdcd8 JB |
1080 | if (params->bssid) { |
1081 | memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); | |
1082 | sdata->u.ibss.fixed_bssid = true; | |
1083 | } else | |
1084 | sdata->u.ibss.fixed_bssid = false; | |
1085 | ||
fffd0934 | 1086 | sdata->u.ibss.privacy = params->privacy; |
267335d6 | 1087 | sdata->u.ibss.control_port = params->control_port; |
fbd2c8dc | 1088 | sdata->u.ibss.basic_rates = params->basic_rates; |
dd5b4cc7 FF |
1089 | memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, |
1090 | sizeof(params->mcast_rate)); | |
fffd0934 | 1091 | |
57c4d7b4 JB |
1092 | sdata->vif.bss_conf.beacon_int = params->beacon_interval; |
1093 | ||
af8cdcd8 | 1094 | sdata->u.ibss.channel = params->channel; |
13c40c54 | 1095 | sdata->u.ibss.channel_type = params->channel_type; |
af8cdcd8 JB |
1096 | sdata->u.ibss.fixed_channel = params->channel_fixed; |
1097 | ||
1098 | if (params->ie) { | |
1099 | sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, | |
1100 | GFP_KERNEL); | |
1101 | if (sdata->u.ibss.ie) | |
1102 | sdata->u.ibss.ie_len = params->ie_len; | |
1103 | } | |
1104 | ||
af8cdcd8 JB |
1105 | sdata->u.ibss.skb = skb; |
1106 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; | |
1107 | sdata->u.ibss.ibss_join_req = jiffies; | |
1108 | ||
0e41f715 | 1109 | memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN); |
0e41f715 JB |
1110 | sdata->u.ibss.ssid_len = params->ssid_len; |
1111 | ||
7da7cc1d JB |
1112 | mutex_unlock(&sdata->u.ibss.mtx); |
1113 | ||
1114 | mutex_lock(&sdata->local->mtx); | |
5cff20e6 | 1115 | ieee80211_recalc_idle(sdata->local); |
7da7cc1d | 1116 | mutex_unlock(&sdata->local->mtx); |
5cff20e6 | 1117 | |
ff3cc5f4 SW |
1118 | /* |
1119 | * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is | |
1120 | * reserved, but an HT STA shall protect HT transmissions as though | |
1121 | * the HT Protection field were set to non-HT mixed mode. | |
1122 | * | |
1123 | * In an IBSS, the RIFS Mode field of the HT Operation element is | |
1124 | * also reserved, but an HT STA shall operate as though this field | |
1125 | * were set to 1. | |
1126 | */ | |
1127 | ||
1128 | sdata->vif.bss_conf.ht_operation_mode |= | |
1129 | IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | |
1130 | | IEEE80211_HT_PARAM_RIFS_MODE; | |
1131 | ||
1132 | changed |= BSS_CHANGED_HT; | |
1133 | ieee80211_bss_info_change_notify(sdata, changed); | |
1134 | ||
64592c8f | 1135 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
af8cdcd8 JB |
1136 | |
1137 | return 0; | |
1138 | } | |
1139 | ||
1140 | int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) | |
1141 | { | |
1142 | struct sk_buff *skb; | |
5ea096c0 TP |
1143 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
1144 | struct ieee80211_local *local = sdata->local; | |
1145 | struct cfg80211_bss *cbss; | |
1146 | u16 capability; | |
7a17a33c | 1147 | int active_ibss; |
8bf11d8d | 1148 | struct sta_info *sta; |
7a17a33c JB |
1149 | |
1150 | mutex_lock(&sdata->u.ibss.mtx); | |
5ea096c0 | 1151 | |
f3209bea JB |
1152 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; |
1153 | memset(sdata->u.ibss.bssid, 0, ETH_ALEN); | |
1154 | sdata->u.ibss.ssid_len = 0; | |
1155 | ||
5ea096c0 TP |
1156 | active_ibss = ieee80211_sta_active_ibss(sdata); |
1157 | ||
1158 | if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) { | |
1159 | capability = WLAN_CAPABILITY_IBSS; | |
1160 | ||
1161 | if (ifibss->privacy) | |
1162 | capability |= WLAN_CAPABILITY_PRIVACY; | |
1163 | ||
1164 | cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->channel, | |
1165 | ifibss->bssid, ifibss->ssid, | |
1166 | ifibss->ssid_len, WLAN_CAPABILITY_IBSS | | |
1167 | WLAN_CAPABILITY_PRIVACY, | |
1168 | capability); | |
1169 | ||
1170 | if (cbss) { | |
1171 | cfg80211_unlink_bss(local->hw.wiphy, cbss); | |
1172 | cfg80211_put_bss(cbss); | |
1173 | } | |
1174 | } | |
af8cdcd8 | 1175 | |
af8cdcd8 | 1176 | sta_info_flush(sdata->local, sdata); |
8bf11d8d JB |
1177 | |
1178 | spin_lock_bh(&ifibss->incomplete_lock); | |
1179 | while (!list_empty(&ifibss->incomplete_stations)) { | |
1180 | sta = list_first_entry(&ifibss->incomplete_stations, | |
1181 | struct sta_info, list); | |
1182 | list_del(&sta->list); | |
1183 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1184 | ||
1185 | sta_info_free(local, sta); | |
1186 | spin_lock_bh(&ifibss->incomplete_lock); | |
1187 | } | |
1188 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1189 | ||
86a2ea41 | 1190 | netif_carrier_off(sdata->dev); |
af8cdcd8 JB |
1191 | |
1192 | /* remove beacon */ | |
1193 | kfree(sdata->u.ibss.ie); | |
40b275b6 JB |
1194 | skb = rcu_dereference_protected(sdata->u.ibss.presp, |
1195 | lockdep_is_held(&sdata->u.ibss.mtx)); | |
a9b3cd7f | 1196 | RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); |
8fc214ba JB |
1197 | sdata->vif.bss_conf.ibss_joined = false; |
1198 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | | |
1199 | BSS_CHANGED_IBSS); | |
af8cdcd8 JB |
1200 | synchronize_rcu(); |
1201 | kfree_skb(skb); | |
1202 | ||
35f20c14 | 1203 | skb_queue_purge(&sdata->skb_queue); |
5cff20e6 | 1204 | |
bc05d19f | 1205 | del_timer_sync(&sdata->u.ibss.timer); |
7a17a33c JB |
1206 | |
1207 | mutex_unlock(&sdata->u.ibss.mtx); | |
bc05d19f | 1208 | |
7da7cc1d | 1209 | mutex_lock(&local->mtx); |
5cff20e6 | 1210 | ieee80211_recalc_idle(sdata->local); |
7da7cc1d | 1211 | mutex_unlock(&local->mtx); |
af8cdcd8 JB |
1212 | |
1213 | return 0; | |
1214 | } |