Commit | Line | Data |
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46900298 JB |
1 | /* |
2 | * IBSS mode implementation | |
3 | * Copyright 2003-2008, Jouni Malinen <j@w1.fi> | |
4 | * Copyright 2004, Instant802 Networks, Inc. | |
5 | * Copyright 2005, Devicescape Software, Inc. | |
6 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
7 | * Copyright 2007, Michael Wu <flamingice@sourmilk.net> | |
8 | * Copyright 2009, Johannes Berg <johannes@sipsolutions.net> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
13 | */ | |
14 | ||
15 | #include <linux/delay.h> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
46900298 JB |
17 | #include <linux/if_ether.h> |
18 | #include <linux/skbuff.h> | |
19 | #include <linux/if_arp.h> | |
20 | #include <linux/etherdevice.h> | |
21 | #include <linux/rtnetlink.h> | |
22 | #include <net/mac80211.h> | |
46900298 JB |
23 | |
24 | #include "ieee80211_i.h" | |
24487981 | 25 | #include "driver-ops.h" |
46900298 JB |
26 | #include "rate.h" |
27 | ||
28 | #define IEEE80211_SCAN_INTERVAL (2 * HZ) | |
46900298 JB |
29 | #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ) |
30 | ||
31 | #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ) | |
32 | #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ) | |
33 | ||
34 | #define IEEE80211_IBSS_MAX_STA_ENTRIES 128 | |
35 | ||
36 | ||
af8cdcd8 JB |
37 | static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
38 | const u8 *bssid, const int beacon_int, | |
39 | struct ieee80211_channel *chan, | |
b59066a2 | 40 | const u32 basic_rates, |
c13a765b SM |
41 | const u16 capability, u64 tsf, |
42 | bool creator) | |
46900298 JB |
43 | { |
44 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
45 | struct ieee80211_local *local = sdata->local; | |
b59066a2 | 46 | int rates, i; |
46900298 JB |
47 | struct 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]; |
683b6d3b | 53 | struct cfg80211_chan_def chandef; |
c3ffeab4 JB |
54 | struct beacon_data *presp; |
55 | int frame_len; | |
24487981 | 56 | |
7a17a33c JB |
57 | lockdep_assert_held(&ifibss->mtx); |
58 | ||
24487981 | 59 | /* Reset own TSF to allow time synchronization work. */ |
37a41b4a | 60 | drv_reset_tsf(local, sdata); |
46900298 | 61 | |
b203ca39 | 62 | if (!ether_addr_equal(ifibss->bssid, bssid)) |
b998e8bb | 63 | sta_info_flush(sdata); |
46900298 | 64 | |
49b5c7f4 JB |
65 | /* if merging, indicate to driver that we leave the old IBSS */ |
66 | if (sdata->vif.bss_conf.ibss_joined) { | |
67 | sdata->vif.bss_conf.ibss_joined = false; | |
c13a765b | 68 | sdata->vif.bss_conf.ibss_creator = false; |
1852d40e | 69 | sdata->vif.bss_conf.enable_beacon = false; |
86a2ea41 | 70 | netif_carrier_off(sdata->dev); |
1852d40e JB |
71 | ieee80211_bss_info_change_notify(sdata, |
72 | BSS_CHANGED_IBSS | | |
73 | BSS_CHANGED_BEACON_ENABLED); | |
49b5c7f4 JB |
74 | } |
75 | ||
c3ffeab4 JB |
76 | presp = rcu_dereference_protected(ifibss->presp, |
77 | lockdep_is_held(&ifibss->mtx)); | |
78 | rcu_assign_pointer(ifibss->presp, NULL); | |
79 | if (presp) | |
80 | kfree_rcu(presp, rcu_head); | |
1852d40e | 81 | |
af8cdcd8 | 82 | sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0; |
46900298 | 83 | |
4bf88530 JB |
84 | cfg80211_chandef_create(&chandef, chan, ifibss->channel_type); |
85 | if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) { | |
86 | chandef.width = NL80211_CHAN_WIDTH_20; | |
87 | chandef.center_freq1 = chan->center_freq; | |
88 | } | |
55de908a JB |
89 | |
90 | ieee80211_vif_release_channel(sdata); | |
4bf88530 | 91 | if (ieee80211_vif_use_channel(sdata, &chandef, |
55de908a JB |
92 | ifibss->fixed_channel ? |
93 | IEEE80211_CHANCTX_SHARED : | |
94 | IEEE80211_CHANCTX_EXCLUSIVE)) { | |
95 | sdata_info(sdata, "Failed to join IBSS, no channel context\n"); | |
96 | return; | |
13c40c54 | 97 | } |
55de908a JB |
98 | |
99 | memcpy(ifibss->bssid, bssid, ETH_ALEN); | |
57c4d7b4 | 100 | |
af8cdcd8 | 101 | sband = local->hw.wiphy->bands[chan->band]; |
46900298 JB |
102 | |
103 | /* Build IBSS probe response */ | |
c3ffeab4 JB |
104 | frame_len = sizeof(struct ieee80211_hdr_3addr) + |
105 | 12 /* struct ieee80211_mgmt.u.beacon */ + | |
106 | 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ + | |
107 | 2 + 8 /* max Supported Rates */ + | |
108 | 3 /* max DS params */ + | |
109 | 4 /* IBSS params */ + | |
110 | 2 + (IEEE80211_MAX_SUPP_RATES - 8) + | |
111 | 2 + sizeof(struct ieee80211_ht_cap) + | |
112 | 2 + sizeof(struct ieee80211_ht_operation) + | |
113 | ifibss->ie_len; | |
114 | presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL); | |
115 | if (!presp) | |
116 | return; | |
117 | ||
118 | presp->head = (void *)(presp + 1); | |
119 | ||
120 | mgmt = (void *) presp->head; | |
46900298 JB |
121 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
122 | IEEE80211_STYPE_PROBE_RESP); | |
e83e6541 | 123 | eth_broadcast_addr(mgmt->da); |
47846c9b | 124 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
46900298 | 125 | memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN); |
57c4d7b4 | 126 | mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int); |
707c1b4e | 127 | mgmt->u.beacon.timestamp = cpu_to_le64(tsf); |
46900298 JB |
128 | mgmt->u.beacon.capab_info = cpu_to_le16(capability); |
129 | ||
c3ffeab4 JB |
130 | pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable); |
131 | ||
46900298 JB |
132 | *pos++ = WLAN_EID_SSID; |
133 | *pos++ = ifibss->ssid_len; | |
134 | memcpy(pos, ifibss->ssid, ifibss->ssid_len); | |
c3ffeab4 | 135 | pos += ifibss->ssid_len; |
46900298 | 136 | |
c3ffeab4 | 137 | rates = min_t(int, 8, sband->n_bitrates); |
46900298 JB |
138 | *pos++ = WLAN_EID_SUPP_RATES; |
139 | *pos++ = rates; | |
c3ffeab4 JB |
140 | for (i = 0; i < rates; i++) { |
141 | int rate = sband->bitrates[i].bitrate; | |
142 | u8 basic = 0; | |
143 | if (basic_rates & BIT(i)) | |
144 | basic = 0x80; | |
145 | *pos++ = basic | (u8) (rate / 5); | |
146 | } | |
46900298 JB |
147 | |
148 | if (sband->band == IEEE80211_BAND_2GHZ) { | |
46900298 JB |
149 | *pos++ = WLAN_EID_DS_PARAMS; |
150 | *pos++ = 1; | |
af8cdcd8 | 151 | *pos++ = ieee80211_frequency_to_channel(chan->center_freq); |
46900298 JB |
152 | } |
153 | ||
46900298 JB |
154 | *pos++ = WLAN_EID_IBSS_PARAMS; |
155 | *pos++ = 2; | |
156 | /* FIX: set ATIM window based on scan results */ | |
157 | *pos++ = 0; | |
158 | *pos++ = 0; | |
159 | ||
b59066a2 | 160 | if (sband->n_bitrates > 8) { |
46900298 | 161 | *pos++ = WLAN_EID_EXT_SUPP_RATES; |
c3ffeab4 JB |
162 | *pos++ = sband->n_bitrates - 8; |
163 | for (i = 8; i < sband->n_bitrates; i++) { | |
164 | int rate = sband->bitrates[i].bitrate; | |
165 | u8 basic = 0; | |
166 | if (basic_rates & BIT(i)) | |
167 | basic = 0x80; | |
168 | *pos++ = basic | (u8) (rate / 5); | |
169 | } | |
46900298 JB |
170 | } |
171 | ||
c3ffeab4 JB |
172 | if (ifibss->ie_len) { |
173 | memcpy(pos, ifibss->ie, ifibss->ie_len); | |
174 | pos += ifibss->ie_len; | |
175 | } | |
af8cdcd8 | 176 | |
13c40c54 | 177 | /* add HT capability and information IEs */ |
4bf88530 | 178 | if (chandef.width != NL80211_CHAN_WIDTH_20_NOHT && |
683b6d3b | 179 | sband->ht_cap.ht_supported) { |
13c40c54 AS |
180 | pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, |
181 | sband->ht_cap.cap); | |
0d894ec5 AN |
182 | /* |
183 | * Note: According to 802.11n-2009 9.13.3.1, HT Protection | |
184 | * field and RIFS Mode are reserved in IBSS mode, therefore | |
185 | * keep them at 0 | |
186 | */ | |
074d46d1 | 187 | pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap, |
4bf88530 | 188 | &chandef, 0); |
13c40c54 AS |
189 | } |
190 | ||
32c5057b | 191 | if (local->hw.queues >= IEEE80211_NUM_ACS) { |
9eba6125 BR |
192 | *pos++ = WLAN_EID_VENDOR_SPECIFIC; |
193 | *pos++ = 7; /* len */ | |
194 | *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */ | |
195 | *pos++ = 0x50; | |
196 | *pos++ = 0xf2; | |
197 | *pos++ = 2; /* WME */ | |
198 | *pos++ = 0; /* WME info */ | |
199 | *pos++ = 1; /* WME ver */ | |
200 | *pos++ = 0; /* U-APSD no in use */ | |
201 | } | |
202 | ||
c3ffeab4 JB |
203 | presp->head_len = pos - presp->head; |
204 | if (WARN_ON(presp->head_len > frame_len)) | |
205 | return; | |
206 | ||
207 | rcu_assign_pointer(ifibss->presp, presp); | |
46900298 | 208 | |
d6a83228 | 209 | sdata->vif.bss_conf.enable_beacon = true; |
2d0ddec5 | 210 | sdata->vif.bss_conf.beacon_int = beacon_int; |
fbd2c8dc | 211 | sdata->vif.bss_conf.basic_rates = basic_rates; |
0ca54f6c MP |
212 | sdata->vif.bss_conf.ssid_len = ifibss->ssid_len; |
213 | memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len); | |
2d0ddec5 JB |
214 | bss_change = BSS_CHANGED_BEACON_INT; |
215 | bss_change |= ieee80211_reset_erp_info(sdata); | |
216 | bss_change |= BSS_CHANGED_BSSID; | |
217 | bss_change |= BSS_CHANGED_BEACON; | |
218 | bss_change |= BSS_CHANGED_BEACON_ENABLED; | |
392cfdb1 | 219 | bss_change |= BSS_CHANGED_BASIC_RATES; |
13c40c54 | 220 | bss_change |= BSS_CHANGED_HT; |
8fc214ba | 221 | bss_change |= BSS_CHANGED_IBSS; |
0ca54f6c | 222 | bss_change |= BSS_CHANGED_SSID; |
2f91a967 SW |
223 | |
224 | /* | |
225 | * In 5 GHz/802.11a, we can always use short slot time. | |
226 | * (IEEE 802.11-2012 18.3.8.7) | |
227 | * | |
228 | * In 2.4GHz, we must always use long slots in IBSS for compatibility | |
229 | * reasons. | |
230 | * (IEEE 802.11-2012 19.4.5) | |
231 | * | |
232 | * HT follows these specifications (IEEE 802.11-2012 20.3.18) | |
233 | */ | |
234 | sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ; | |
235 | bss_change |= BSS_CHANGED_ERP_SLOT; | |
236 | ||
8fc214ba | 237 | sdata->vif.bss_conf.ibss_joined = true; |
c13a765b | 238 | sdata->vif.bss_conf.ibss_creator = creator; |
2d0ddec5 | 239 | ieee80211_bss_info_change_notify(sdata, bss_change); |
46900298 | 240 | |
b59066a2 | 241 | ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates); |
46900298 | 242 | |
46900298 | 243 | ifibss->state = IEEE80211_IBSS_MLME_JOINED; |
af8cdcd8 JB |
244 | mod_timer(&ifibss->timer, |
245 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 | 246 | |
273686d6 | 247 | bss = cfg80211_inform_bss_frame(local->hw.wiphy, chan, |
c3ffeab4 | 248 | mgmt, presp->head_len, 0, GFP_KERNEL); |
5b112d3d | 249 | cfg80211_put_bss(local->hw.wiphy, bss); |
86a2ea41 | 250 | netif_carrier_on(sdata->dev); |
af8cdcd8 | 251 | cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL); |
46900298 JB |
252 | } |
253 | ||
af8cdcd8 JB |
254 | static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
255 | struct ieee80211_bss *bss) | |
46900298 | 256 | { |
0c1ad2ca JB |
257 | struct cfg80211_bss *cbss = |
258 | container_of((void *)bss, struct cfg80211_bss, priv); | |
b59066a2 JB |
259 | struct ieee80211_supported_band *sband; |
260 | u32 basic_rates; | |
261 | int i, j; | |
0c1ad2ca | 262 | u16 beacon_int = cbss->beacon_interval; |
8cef2c9d JB |
263 | const struct cfg80211_bss_ies *ies; |
264 | u64 tsf; | |
57c4d7b4 | 265 | |
7a17a33c JB |
266 | lockdep_assert_held(&sdata->u.ibss.mtx); |
267 | ||
57c4d7b4 JB |
268 | if (beacon_int < 10) |
269 | beacon_int = 10; | |
270 | ||
0c1ad2ca | 271 | sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; |
b59066a2 JB |
272 | |
273 | basic_rates = 0; | |
274 | ||
275 | for (i = 0; i < bss->supp_rates_len; i++) { | |
276 | int rate = (bss->supp_rates[i] & 0x7f) * 5; | |
277 | bool is_basic = !!(bss->supp_rates[i] & 0x80); | |
278 | ||
279 | for (j = 0; j < sband->n_bitrates; j++) { | |
280 | if (sband->bitrates[j].bitrate == rate) { | |
281 | if (is_basic) | |
282 | basic_rates |= BIT(j); | |
283 | break; | |
284 | } | |
285 | } | |
286 | } | |
287 | ||
8cef2c9d JB |
288 | rcu_read_lock(); |
289 | ies = rcu_dereference(cbss->ies); | |
290 | tsf = ies->tsf; | |
291 | rcu_read_unlock(); | |
292 | ||
0c1ad2ca | 293 | __ieee80211_sta_join_ibss(sdata, cbss->bssid, |
57c4d7b4 | 294 | beacon_int, |
0c1ad2ca | 295 | cbss->channel, |
b59066a2 | 296 | basic_rates, |
0c1ad2ca | 297 | cbss->capability, |
8cef2c9d | 298 | tsf, false); |
46900298 JB |
299 | } |
300 | ||
6d810f10 AQ |
301 | static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta, |
302 | bool auth) | |
8bf11d8d JB |
303 | __acquires(RCU) |
304 | { | |
305 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
306 | u8 addr[ETH_ALEN]; | |
307 | ||
308 | memcpy(addr, sta->sta.addr, ETH_ALEN); | |
309 | ||
bdcbd8e0 | 310 | ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr); |
8bf11d8d | 311 | |
83d5cc01 JB |
312 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); |
313 | sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); | |
267335d6 AQ |
314 | /* authorize the station only if the network is not RSN protected. If |
315 | * not wait for the userspace to authorize it */ | |
316 | if (!sta->sdata->u.ibss.control_port) | |
317 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); | |
8bf11d8d JB |
318 | |
319 | rate_control_rate_init(sta); | |
320 | ||
321 | /* If it fails, maybe we raced another insertion? */ | |
322 | if (sta_info_insert_rcu(sta)) | |
323 | return sta_info_get(sdata, addr); | |
452a6d22 | 324 | if (auth && !sdata->u.ibss.auth_frame_registrations) { |
bdcbd8e0 JB |
325 | ibss_dbg(sdata, |
326 | "TX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=1)\n", | |
2514ec86 | 327 | sdata->vif.addr, addr, sdata->u.ibss.bssid); |
700e8ea6 | 328 | ieee80211_send_auth(sdata, 1, WLAN_AUTH_OPEN, 0, NULL, 0, |
1672c0e3 | 329 | addr, sdata->u.ibss.bssid, NULL, 0, 0, 0); |
6d810f10 | 330 | } |
8bf11d8d JB |
331 | return sta; |
332 | } | |
333 | ||
334 | static struct sta_info * | |
335 | ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, | |
336 | const u8 *bssid, const u8 *addr, | |
6d810f10 | 337 | u32 supp_rates, bool auth) |
8bf11d8d JB |
338 | __acquires(RCU) |
339 | { | |
340 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
341 | struct ieee80211_local *local = sdata->local; | |
342 | struct sta_info *sta; | |
55de908a | 343 | struct ieee80211_chanctx_conf *chanctx_conf; |
b422c6cd | 344 | struct ieee80211_supported_band *sband; |
55de908a | 345 | int band; |
8bf11d8d JB |
346 | |
347 | /* | |
348 | * XXX: Consider removing the least recently used entry and | |
349 | * allow new one to be added. | |
350 | */ | |
351 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { | |
bdcbd8e0 | 352 | net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
e87cc472 | 353 | sdata->name, addr); |
8bf11d8d JB |
354 | rcu_read_lock(); |
355 | return NULL; | |
356 | } | |
357 | ||
358 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { | |
359 | rcu_read_lock(); | |
360 | return NULL; | |
361 | } | |
362 | ||
b203ca39 | 363 | if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) { |
8bf11d8d JB |
364 | rcu_read_lock(); |
365 | return NULL; | |
366 | } | |
367 | ||
55de908a JB |
368 | rcu_read_lock(); |
369 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
370 | if (WARN_ON_ONCE(!chanctx_conf)) | |
371 | return NULL; | |
4bf88530 | 372 | band = chanctx_conf->def.chan->band; |
55de908a JB |
373 | rcu_read_unlock(); |
374 | ||
8bf11d8d JB |
375 | sta = sta_info_alloc(sdata, addr, GFP_KERNEL); |
376 | if (!sta) { | |
377 | rcu_read_lock(); | |
378 | return NULL; | |
379 | } | |
380 | ||
381 | sta->last_rx = jiffies; | |
382 | ||
383 | /* make sure mandatory rates are always added */ | |
b422c6cd | 384 | sband = local->hw.wiphy->bands[band]; |
8bf11d8d | 385 | sta->sta.supp_rates[band] = supp_rates | |
b422c6cd | 386 | ieee80211_mandatory_rates(sband); |
8bf11d8d | 387 | |
6d810f10 AQ |
388 | return ieee80211_ibss_finish_sta(sta, auth); |
389 | } | |
390 | ||
2cc59e78 AQ |
391 | static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata, |
392 | struct ieee80211_mgmt *mgmt, | |
393 | size_t len) | |
394 | { | |
395 | u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code); | |
396 | ||
397 | if (len < IEEE80211_DEAUTH_FRAME_LEN) | |
398 | return; | |
399 | ||
400 | ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n", | |
401 | mgmt->sa, mgmt->da, mgmt->bssid, reason); | |
402 | sta_info_destroy_addr(sdata, mgmt->sa); | |
403 | } | |
404 | ||
6d810f10 AQ |
405 | static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, |
406 | struct ieee80211_mgmt *mgmt, | |
407 | size_t len) | |
408 | { | |
409 | u16 auth_alg, auth_transaction; | |
2cc59e78 AQ |
410 | struct sta_info *sta; |
411 | u8 deauth_frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; | |
6d810f10 AQ |
412 | |
413 | lockdep_assert_held(&sdata->u.ibss.mtx); | |
414 | ||
415 | if (len < 24 + 6) | |
416 | return; | |
417 | ||
418 | auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); | |
419 | auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); | |
420 | ||
bdcbd8e0 JB |
421 | ibss_dbg(sdata, |
422 | "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n", | |
423 | mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction); | |
7bed2050 AQ |
424 | |
425 | if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) | |
426 | return; | |
427 | ||
6d810f10 | 428 | sta_info_destroy_addr(sdata, mgmt->sa); |
2cc59e78 | 429 | sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 0, false); |
6d810f10 AQ |
430 | rcu_read_unlock(); |
431 | ||
2cc59e78 AQ |
432 | /* |
433 | * if we have any problem in allocating the new station, we reply with a | |
434 | * DEAUTH frame to tell the other end that we had a problem | |
435 | */ | |
436 | if (!sta) { | |
437 | ieee80211_send_deauth_disassoc(sdata, sdata->u.ibss.bssid, | |
438 | IEEE80211_STYPE_DEAUTH, | |
439 | WLAN_REASON_UNSPECIFIED, true, | |
440 | deauth_frame_buf); | |
441 | return; | |
442 | } | |
443 | ||
6d810f10 AQ |
444 | /* |
445 | * IEEE 802.11 standard does not require authentication in IBSS | |
446 | * networks and most implementations do not seem to use it. | |
447 | * However, try to reply to authentication attempts if someone | |
448 | * has actually implemented this. | |
449 | */ | |
700e8ea6 | 450 | ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0, |
1672c0e3 | 451 | mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0); |
8bf11d8d JB |
452 | } |
453 | ||
46900298 | 454 | static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, |
d45c4172 | 455 | struct ieee80211_mgmt *mgmt, size_t len, |
46900298 | 456 | struct ieee80211_rx_status *rx_status, |
d45c4172 | 457 | struct ieee802_11_elems *elems) |
46900298 JB |
458 | { |
459 | struct ieee80211_local *local = sdata->local; | |
460 | int freq; | |
0c1ad2ca | 461 | struct cfg80211_bss *cbss; |
46900298 JB |
462 | struct ieee80211_bss *bss; |
463 | struct sta_info *sta; | |
464 | struct ieee80211_channel *channel; | |
465 | u64 beacon_timestamp, rx_timestamp; | |
466 | u32 supp_rates = 0; | |
467 | enum ieee80211_band band = rx_status->band; | |
13c40c54 AS |
468 | struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; |
469 | bool rates_updated = false; | |
46900298 | 470 | |
1cd8e88e | 471 | if (elems->ds_params) |
59eb21a6 BR |
472 | freq = ieee80211_channel_to_frequency(elems->ds_params[0], |
473 | band); | |
46900298 JB |
474 | else |
475 | freq = rx_status->freq; | |
476 | ||
477 | channel = ieee80211_get_channel(local->hw.wiphy, freq); | |
478 | ||
479 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
480 | return; | |
481 | ||
9eba6125 | 482 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC && |
b203ca39 | 483 | ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) { |
46900298 JB |
484 | |
485 | rcu_read_lock(); | |
abe60632 | 486 | sta = sta_info_get(sdata, mgmt->sa); |
46900298 | 487 | |
9eba6125 BR |
488 | if (elems->supp_rates) { |
489 | supp_rates = ieee80211_sta_get_rates(local, elems, | |
9ebb61a2 | 490 | band, NULL); |
9eba6125 BR |
491 | if (sta) { |
492 | u32 prev_rates; | |
493 | ||
494 | prev_rates = sta->sta.supp_rates[band]; | |
495 | /* make sure mandatory rates are always added */ | |
496 | sta->sta.supp_rates[band] = supp_rates | | |
b422c6cd | 497 | ieee80211_mandatory_rates(sband); |
46900298 | 498 | |
9eba6125 | 499 | if (sta->sta.supp_rates[band] != prev_rates) { |
bdcbd8e0 JB |
500 | ibss_dbg(sdata, |
501 | "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", | |
502 | sta->sta.addr, prev_rates, | |
503 | sta->sta.supp_rates[band]); | |
13c40c54 | 504 | rates_updated = true; |
9eba6125 | 505 | } |
8bf11d8d JB |
506 | } else { |
507 | rcu_read_unlock(); | |
9eba6125 | 508 | sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, |
6d810f10 | 509 | mgmt->sa, supp_rates, true); |
8bf11d8d | 510 | } |
34e89507 | 511 | } |
9eba6125 BR |
512 | |
513 | if (sta && elems->wmm_info) | |
c2c98fde | 514 | set_sta_flag(sta, WLAN_STA_WME); |
9eba6125 | 515 | |
074d46d1 | 516 | if (sta && elems->ht_operation && elems->ht_cap_elem && |
13c40c54 AS |
517 | sdata->u.ibss.channel_type != NL80211_CHAN_NO_HT) { |
518 | /* we both use HT */ | |
e1a0c6b3 | 519 | struct ieee80211_ht_cap htcap_ie; |
4bf88530 JB |
520 | struct cfg80211_chan_def chandef; |
521 | ||
522 | ieee80211_ht_oper_to_chandef(channel, | |
523 | elems->ht_operation, | |
524 | &chandef); | |
13c40c54 | 525 | |
e1a0c6b3 | 526 | memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie)); |
13c40c54 AS |
527 | |
528 | /* | |
529 | * fall back to HT20 if we don't use or use | |
530 | * the other extension channel | |
531 | */ | |
e1a0c6b3 | 532 | if (cfg80211_get_chandef_type(&chandef) != |
4bf88530 | 533 | sdata->u.ibss.channel_type) |
e1a0c6b3 JB |
534 | htcap_ie.cap_info &= |
535 | cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40); | |
536 | ||
537 | rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap( | |
538 | sdata, sband, &htcap_ie, sta); | |
13c40c54 AS |
539 | } |
540 | ||
e687f61e AQ |
541 | if (sta && rates_updated) { |
542 | drv_sta_rc_update(local, sdata, &sta->sta, | |
543 | IEEE80211_RC_SUPP_RATES_CHANGED); | |
13c40c54 | 544 | rate_control_rate_init(sta); |
e687f61e | 545 | } |
13c40c54 | 546 | |
9eba6125 | 547 | rcu_read_unlock(); |
46900298 JB |
548 | } |
549 | ||
550 | bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, | |
d45c4172 | 551 | channel); |
46900298 JB |
552 | if (!bss) |
553 | return; | |
554 | ||
0c1ad2ca JB |
555 | cbss = container_of((void *)bss, struct cfg80211_bss, priv); |
556 | ||
8cef2c9d JB |
557 | /* same for beacon and probe response */ |
558 | beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp); | |
46900298 JB |
559 | |
560 | /* check if we need to merge IBSS */ | |
561 | ||
46900298 | 562 | /* we use a fixed BSSID */ |
a98bfec2 | 563 | if (sdata->u.ibss.fixed_bssid) |
46900298 JB |
564 | goto put_bss; |
565 | ||
566 | /* not an IBSS */ | |
0c1ad2ca | 567 | if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) |
46900298 JB |
568 | goto put_bss; |
569 | ||
570 | /* different channel */ | |
55de908a JB |
571 | if (sdata->u.ibss.fixed_channel && |
572 | sdata->u.ibss.channel != cbss->channel) | |
46900298 JB |
573 | goto put_bss; |
574 | ||
575 | /* different SSID */ | |
576 | if (elems->ssid_len != sdata->u.ibss.ssid_len || | |
577 | memcmp(elems->ssid, sdata->u.ibss.ssid, | |
578 | sdata->u.ibss.ssid_len)) | |
579 | goto put_bss; | |
580 | ||
34e8f082 | 581 | /* same BSSID */ |
b203ca39 | 582 | if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) |
34e8f082 AF |
583 | goto put_bss; |
584 | ||
f4bda337 TP |
585 | if (ieee80211_have_rx_timestamp(rx_status)) { |
586 | /* time when timestamp field was received */ | |
587 | rx_timestamp = | |
588 | ieee80211_calculate_rx_timestamp(local, rx_status, | |
589 | len + FCS_LEN, 24); | |
24487981 JB |
590 | } else { |
591 | /* | |
592 | * second best option: get current TSF | |
593 | * (will return -1 if not supported) | |
594 | */ | |
37a41b4a | 595 | rx_timestamp = drv_get_tsf(local, sdata); |
24487981 | 596 | } |
46900298 | 597 | |
bdcbd8e0 JB |
598 | ibss_dbg(sdata, |
599 | "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", | |
600 | mgmt->sa, mgmt->bssid, | |
601 | (unsigned long long)rx_timestamp, | |
602 | (unsigned long long)beacon_timestamp, | |
603 | (unsigned long long)(rx_timestamp - beacon_timestamp), | |
604 | jiffies); | |
46900298 JB |
605 | |
606 | if (beacon_timestamp > rx_timestamp) { | |
bdcbd8e0 JB |
607 | ibss_dbg(sdata, |
608 | "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", | |
609 | mgmt->bssid); | |
46900298 | 610 | ieee80211_sta_join_ibss(sdata, bss); |
9ebb61a2 | 611 | supp_rates = ieee80211_sta_get_rates(local, elems, band, NULL); |
34e89507 | 612 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, |
6d810f10 | 613 | supp_rates, true); |
8bf11d8d | 614 | rcu_read_unlock(); |
46900298 JB |
615 | } |
616 | ||
617 | put_bss: | |
618 | ieee80211_rx_bss_put(local, bss); | |
619 | } | |
620 | ||
8bf11d8d JB |
621 | void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, |
622 | const u8 *bssid, const u8 *addr, | |
623 | u32 supp_rates) | |
46900298 | 624 | { |
2e10d330 | 625 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
46900298 JB |
626 | struct ieee80211_local *local = sdata->local; |
627 | struct sta_info *sta; | |
55de908a | 628 | struct ieee80211_chanctx_conf *chanctx_conf; |
b422c6cd | 629 | struct ieee80211_supported_band *sband; |
55de908a | 630 | int band; |
46900298 | 631 | |
af8cdcd8 JB |
632 | /* |
633 | * XXX: Consider removing the least recently used entry and | |
634 | * allow new one to be added. | |
635 | */ | |
46900298 | 636 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { |
bdcbd8e0 | 637 | net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
e87cc472 | 638 | sdata->name, addr); |
8bf11d8d | 639 | return; |
46900298 JB |
640 | } |
641 | ||
2e10d330 | 642 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) |
8bf11d8d | 643 | return; |
2e10d330 | 644 | |
b203ca39 | 645 | if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) |
8bf11d8d | 646 | return; |
46900298 | 647 | |
55de908a JB |
648 | rcu_read_lock(); |
649 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
650 | if (WARN_ON_ONCE(!chanctx_conf)) { | |
651 | rcu_read_unlock(); | |
652 | return; | |
653 | } | |
4bf88530 | 654 | band = chanctx_conf->def.chan->band; |
55de908a JB |
655 | rcu_read_unlock(); |
656 | ||
8bf11d8d | 657 | sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); |
46900298 | 658 | if (!sta) |
8bf11d8d | 659 | return; |
46900298 | 660 | |
c8716d9d | 661 | sta->last_rx = jiffies; |
d9a7ddb0 | 662 | |
46900298 | 663 | /* make sure mandatory rates are always added */ |
b422c6cd | 664 | sband = local->hw.wiphy->bands[band]; |
46900298 | 665 | sta->sta.supp_rates[band] = supp_rates | |
b422c6cd | 666 | ieee80211_mandatory_rates(sband); |
46900298 | 667 | |
8bf11d8d JB |
668 | spin_lock(&ifibss->incomplete_lock); |
669 | list_add(&sta->list, &ifibss->incomplete_stations); | |
670 | spin_unlock(&ifibss->incomplete_lock); | |
671 | ieee80211_queue_work(&local->hw, &sdata->work); | |
46900298 JB |
672 | } |
673 | ||
674 | static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) | |
675 | { | |
676 | struct ieee80211_local *local = sdata->local; | |
677 | int active = 0; | |
678 | struct sta_info *sta; | |
679 | ||
7a17a33c JB |
680 | lockdep_assert_held(&sdata->u.ibss.mtx); |
681 | ||
46900298 JB |
682 | rcu_read_lock(); |
683 | ||
684 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
685 | if (sta->sdata == sdata && | |
686 | time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL, | |
687 | jiffies)) { | |
688 | active++; | |
689 | break; | |
690 | } | |
691 | } | |
692 | ||
693 | rcu_read_unlock(); | |
694 | ||
695 | return active; | |
696 | } | |
697 | ||
ce9058ae BP |
698 | /* |
699 | * This function is called with state == IEEE80211_IBSS_MLME_JOINED | |
700 | */ | |
46900298 JB |
701 | |
702 | static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) | |
703 | { | |
704 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
705 | ||
7a17a33c JB |
706 | lockdep_assert_held(&ifibss->mtx); |
707 | ||
af8cdcd8 JB |
708 | mod_timer(&ifibss->timer, |
709 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 JB |
710 | |
711 | ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT); | |
af8cdcd8 | 712 | |
450aae3d S |
713 | if (time_before(jiffies, ifibss->last_scan_completed + |
714 | IEEE80211_IBSS_MERGE_INTERVAL)) | |
715 | return; | |
716 | ||
46900298 JB |
717 | if (ieee80211_sta_active_ibss(sdata)) |
718 | return; | |
719 | ||
c037b836 | 720 | if (ifibss->fixed_channel) |
46900298 JB |
721 | return; |
722 | ||
bdcbd8e0 JB |
723 | sdata_info(sdata, |
724 | "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); | |
46900298 | 725 | |
34bcf715 SG |
726 | ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len, |
727 | NULL); | |
46900298 JB |
728 | } |
729 | ||
af8cdcd8 | 730 | static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
731 | { |
732 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
46900298 | 733 | u8 bssid[ETH_ALEN]; |
46900298 JB |
734 | u16 capability; |
735 | int i; | |
736 | ||
7a17a33c JB |
737 | lockdep_assert_held(&ifibss->mtx); |
738 | ||
af8cdcd8 | 739 | if (ifibss->fixed_bssid) { |
46900298 JB |
740 | memcpy(bssid, ifibss->bssid, ETH_ALEN); |
741 | } else { | |
742 | /* Generate random, not broadcast, locally administered BSSID. Mix in | |
743 | * own MAC address to make sure that devices that do not have proper | |
744 | * random number generator get different BSSID. */ | |
745 | get_random_bytes(bssid, ETH_ALEN); | |
746 | for (i = 0; i < ETH_ALEN; i++) | |
47846c9b | 747 | bssid[i] ^= sdata->vif.addr[i]; |
46900298 JB |
748 | bssid[0] &= ~0x01; |
749 | bssid[0] |= 0x02; | |
750 | } | |
751 | ||
bdcbd8e0 | 752 | sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); |
46900298 | 753 | |
46900298 JB |
754 | capability = WLAN_CAPABILITY_IBSS; |
755 | ||
fffd0934 | 756 | if (ifibss->privacy) |
46900298 JB |
757 | capability |= WLAN_CAPABILITY_PRIVACY; |
758 | else | |
759 | sdata->drop_unencrypted = 0; | |
760 | ||
57c4d7b4 | 761 | __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, |
fbd2c8dc | 762 | ifibss->channel, ifibss->basic_rates, |
c13a765b | 763 | capability, 0, true); |
46900298 JB |
764 | } |
765 | ||
ce9058ae BP |
766 | /* |
767 | * This function is called with state == IEEE80211_IBSS_MLME_SEARCH | |
768 | */ | |
769 | ||
af8cdcd8 | 770 | static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
771 | { |
772 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
773 | struct ieee80211_local *local = sdata->local; | |
0c1ad2ca | 774 | struct cfg80211_bss *cbss; |
af8cdcd8 | 775 | struct ieee80211_channel *chan = NULL; |
46900298 JB |
776 | const u8 *bssid = NULL; |
777 | int active_ibss; | |
e0d61887 | 778 | u16 capability; |
46900298 | 779 | |
7a17a33c JB |
780 | lockdep_assert_held(&ifibss->mtx); |
781 | ||
46900298 | 782 | active_ibss = ieee80211_sta_active_ibss(sdata); |
bdcbd8e0 | 783 | ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); |
46900298 JB |
784 | |
785 | if (active_ibss) | |
af8cdcd8 | 786 | return; |
46900298 | 787 | |
e0d61887 | 788 | capability = WLAN_CAPABILITY_IBSS; |
fffd0934 | 789 | if (ifibss->privacy) |
e0d61887 | 790 | capability |= WLAN_CAPABILITY_PRIVACY; |
af8cdcd8 JB |
791 | if (ifibss->fixed_bssid) |
792 | bssid = ifibss->bssid; | |
793 | if (ifibss->fixed_channel) | |
794 | chan = ifibss->channel; | |
795 | if (!is_zero_ether_addr(ifibss->bssid)) | |
46900298 | 796 | bssid = ifibss->bssid; |
0c1ad2ca JB |
797 | cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, |
798 | ifibss->ssid, ifibss->ssid_len, | |
799 | WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY, | |
800 | capability); | |
801 | ||
802 | if (cbss) { | |
803 | struct ieee80211_bss *bss; | |
46900298 | 804 | |
0c1ad2ca | 805 | bss = (void *)cbss->priv; |
bdcbd8e0 JB |
806 | ibss_dbg(sdata, |
807 | "sta_find_ibss: selected %pM current %pM\n", | |
808 | cbss->bssid, ifibss->bssid); | |
809 | sdata_info(sdata, | |
810 | "Selected IBSS BSSID %pM based on configured SSID\n", | |
811 | cbss->bssid); | |
46900298 | 812 | |
af8cdcd8 | 813 | ieee80211_sta_join_ibss(sdata, bss); |
46900298 | 814 | ieee80211_rx_bss_put(local, bss); |
af8cdcd8 | 815 | return; |
d419b9f0 | 816 | } |
46900298 | 817 | |
bdcbd8e0 | 818 | ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); |
46900298 JB |
819 | |
820 | /* Selected IBSS not found in current scan results - try to scan */ | |
ce9058ae | 821 | if (time_after(jiffies, ifibss->last_scan_completed + |
46900298 | 822 | IEEE80211_SCAN_INTERVAL)) { |
bdcbd8e0 | 823 | sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); |
46900298 | 824 | |
34bcf715 SG |
825 | ieee80211_request_ibss_scan(sdata, ifibss->ssid, |
826 | ifibss->ssid_len, chan); | |
ce9058ae | 827 | } else { |
46900298 JB |
828 | int interval = IEEE80211_SCAN_INTERVAL; |
829 | ||
830 | if (time_after(jiffies, ifibss->ibss_join_req + | |
55de908a JB |
831 | IEEE80211_IBSS_JOIN_TIMEOUT)) |
832 | ieee80211_sta_create_ibss(sdata); | |
46900298 | 833 | |
af8cdcd8 JB |
834 | mod_timer(&ifibss->timer, |
835 | round_jiffies(jiffies + interval)); | |
46900298 | 836 | } |
46900298 JB |
837 | } |
838 | ||
839 | static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, | |
c269a203 | 840 | struct sk_buff *req) |
46900298 | 841 | { |
c269a203 | 842 | struct ieee80211_mgmt *mgmt = (void *)req->data; |
46900298 JB |
843 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
844 | struct ieee80211_local *local = sdata->local; | |
c269a203 | 845 | int tx_last_beacon, len = req->len; |
46900298 | 846 | struct sk_buff *skb; |
c3ffeab4 | 847 | struct beacon_data *presp; |
46900298 JB |
848 | u8 *pos, *end; |
849 | ||
7a17a33c JB |
850 | lockdep_assert_held(&ifibss->mtx); |
851 | ||
40b275b6 JB |
852 | presp = rcu_dereference_protected(ifibss->presp, |
853 | lockdep_is_held(&ifibss->mtx)); | |
854 | ||
46900298 | 855 | if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || |
40b275b6 | 856 | len < 24 + 2 || !presp) |
46900298 JB |
857 | return; |
858 | ||
24487981 | 859 | tx_last_beacon = drv_tx_last_beacon(local); |
46900298 | 860 | |
bdcbd8e0 JB |
861 | ibss_dbg(sdata, |
862 | "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n", | |
863 | mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon); | |
46900298 | 864 | |
1ed76487 | 865 | if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) |
46900298 JB |
866 | return; |
867 | ||
b203ca39 | 868 | if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && |
888d04df | 869 | !is_broadcast_ether_addr(mgmt->bssid)) |
46900298 JB |
870 | return; |
871 | ||
872 | end = ((u8 *) mgmt) + len; | |
873 | pos = mgmt->u.probe_req.variable; | |
874 | if (pos[0] != WLAN_EID_SSID || | |
875 | pos + 2 + pos[1] > end) { | |
bdcbd8e0 JB |
876 | ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", |
877 | mgmt->sa); | |
46900298 JB |
878 | return; |
879 | } | |
880 | if (pos[1] != 0 && | |
881 | (pos[1] != ifibss->ssid_len || | |
0da780c2 | 882 | memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { |
46900298 JB |
883 | /* Ignore ProbeReq for foreign SSID */ |
884 | return; | |
885 | } | |
886 | ||
887 | /* Reply with ProbeResp */ | |
c3ffeab4 | 888 | skb = dev_alloc_skb(local->tx_headroom + presp->head_len); |
46900298 JB |
889 | if (!skb) |
890 | return; | |
891 | ||
c3ffeab4 JB |
892 | skb_reserve(skb, local->tx_headroom); |
893 | memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len); | |
894 | ||
895 | memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN); | |
896 | ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa); | |
62ae67be JB |
897 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
898 | ieee80211_tx_skb(sdata, skb); | |
46900298 JB |
899 | } |
900 | ||
d45c4172 EG |
901 | static |
902 | void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata, | |
903 | struct ieee80211_mgmt *mgmt, size_t len, | |
904 | struct ieee80211_rx_status *rx_status) | |
46900298 JB |
905 | { |
906 | size_t baselen; | |
907 | struct ieee802_11_elems elems; | |
908 | ||
d45c4172 EG |
909 | BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) != |
910 | offsetof(typeof(mgmt->u.beacon), variable)); | |
911 | ||
912 | /* | |
913 | * either beacon or probe_resp but the variable field is at the | |
914 | * same offset | |
915 | */ | |
46900298 JB |
916 | baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; |
917 | if (baselen > len) | |
918 | return; | |
919 | ||
920 | ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, | |
b2e506bf | 921 | false, &elems); |
46900298 | 922 | |
d45c4172 | 923 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); |
46900298 JB |
924 | } |
925 | ||
1fa57d01 JB |
926 | void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, |
927 | struct sk_buff *skb) | |
46900298 JB |
928 | { |
929 | struct ieee80211_rx_status *rx_status; | |
930 | struct ieee80211_mgmt *mgmt; | |
931 | u16 fc; | |
932 | ||
f1d58c25 | 933 | rx_status = IEEE80211_SKB_RXCB(skb); |
46900298 JB |
934 | mgmt = (struct ieee80211_mgmt *) skb->data; |
935 | fc = le16_to_cpu(mgmt->frame_control); | |
936 | ||
7a17a33c JB |
937 | mutex_lock(&sdata->u.ibss.mtx); |
938 | ||
c926d006 TH |
939 | if (!sdata->u.ibss.ssid_len) |
940 | goto mgmt_out; /* not ready to merge yet */ | |
941 | ||
46900298 JB |
942 | switch (fc & IEEE80211_FCTL_STYPE) { |
943 | case IEEE80211_STYPE_PROBE_REQ: | |
c269a203 | 944 | ieee80211_rx_mgmt_probe_req(sdata, skb); |
46900298 JB |
945 | break; |
946 | case IEEE80211_STYPE_PROBE_RESP: | |
46900298 | 947 | case IEEE80211_STYPE_BEACON: |
d45c4172 EG |
948 | ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len, |
949 | rx_status); | |
46900298 JB |
950 | break; |
951 | case IEEE80211_STYPE_AUTH: | |
952 | ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); | |
953 | break; | |
2cc59e78 AQ |
954 | case IEEE80211_STYPE_DEAUTH: |
955 | ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); | |
956 | break; | |
46900298 | 957 | } |
7a17a33c | 958 | |
c926d006 | 959 | mgmt_out: |
7a17a33c | 960 | mutex_unlock(&sdata->u.ibss.mtx); |
46900298 JB |
961 | } |
962 | ||
1fa57d01 | 963 | void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) |
46900298 | 964 | { |
1fa57d01 | 965 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
8bf11d8d | 966 | struct sta_info *sta; |
46900298 | 967 | |
7a17a33c JB |
968 | mutex_lock(&ifibss->mtx); |
969 | ||
970 | /* | |
971 | * Work could be scheduled after scan or similar | |
972 | * when we aren't even joined (or trying) with a | |
973 | * network. | |
974 | */ | |
975 | if (!ifibss->ssid_len) | |
976 | goto out; | |
46900298 | 977 | |
8bf11d8d JB |
978 | spin_lock_bh(&ifibss->incomplete_lock); |
979 | while (!list_empty(&ifibss->incomplete_stations)) { | |
980 | sta = list_first_entry(&ifibss->incomplete_stations, | |
981 | struct sta_info, list); | |
982 | list_del(&sta->list); | |
983 | spin_unlock_bh(&ifibss->incomplete_lock); | |
984 | ||
6d810f10 | 985 | ieee80211_ibss_finish_sta(sta, true); |
8bf11d8d JB |
986 | rcu_read_unlock(); |
987 | spin_lock_bh(&ifibss->incomplete_lock); | |
988 | } | |
989 | spin_unlock_bh(&ifibss->incomplete_lock); | |
990 | ||
46900298 JB |
991 | switch (ifibss->state) { |
992 | case IEEE80211_IBSS_MLME_SEARCH: | |
993 | ieee80211_sta_find_ibss(sdata); | |
994 | break; | |
995 | case IEEE80211_IBSS_MLME_JOINED: | |
996 | ieee80211_sta_merge_ibss(sdata); | |
997 | break; | |
998 | default: | |
999 | WARN_ON(1); | |
1000 | break; | |
1001 | } | |
46900298 | 1002 | |
7a17a33c JB |
1003 | out: |
1004 | mutex_unlock(&ifibss->mtx); | |
3a4d4aa2 JB |
1005 | } |
1006 | ||
46900298 JB |
1007 | static void ieee80211_ibss_timer(unsigned long data) |
1008 | { | |
1009 | struct ieee80211_sub_if_data *sdata = | |
1010 | (struct ieee80211_sub_if_data *) data; | |
5bb644a0 | 1011 | |
a6182943 | 1012 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
5bb644a0 | 1013 | } |
5bb644a0 | 1014 | |
46900298 JB |
1015 | void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) |
1016 | { | |
1017 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1018 | ||
46900298 JB |
1019 | setup_timer(&ifibss->timer, ieee80211_ibss_timer, |
1020 | (unsigned long) sdata); | |
7a17a33c | 1021 | mutex_init(&ifibss->mtx); |
8bf11d8d JB |
1022 | INIT_LIST_HEAD(&ifibss->incomplete_stations); |
1023 | spin_lock_init(&ifibss->incomplete_lock); | |
46900298 JB |
1024 | } |
1025 | ||
1026 | /* scan finished notification */ | |
1027 | void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) | |
1028 | { | |
af8cdcd8 | 1029 | struct ieee80211_sub_if_data *sdata; |
46900298 | 1030 | |
29b4a4f7 JB |
1031 | mutex_lock(&local->iflist_mtx); |
1032 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 1033 | if (!ieee80211_sdata_running(sdata)) |
0e41f715 | 1034 | continue; |
af8cdcd8 JB |
1035 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
1036 | continue; | |
1037 | sdata->u.ibss.last_scan_completed = jiffies; | |
7a17a33c | 1038 | ieee80211_queue_work(&local->hw, &sdata->work); |
46900298 | 1039 | } |
29b4a4f7 | 1040 | mutex_unlock(&local->iflist_mtx); |
46900298 JB |
1041 | } |
1042 | ||
af8cdcd8 JB |
1043 | int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, |
1044 | struct cfg80211_ibss_params *params) | |
1045 | { | |
ff3cc5f4 | 1046 | u32 changed = 0; |
af8cdcd8 | 1047 | |
7a17a33c JB |
1048 | mutex_lock(&sdata->u.ibss.mtx); |
1049 | ||
af8cdcd8 JB |
1050 | if (params->bssid) { |
1051 | memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); | |
1052 | sdata->u.ibss.fixed_bssid = true; | |
1053 | } else | |
1054 | sdata->u.ibss.fixed_bssid = false; | |
1055 | ||
fffd0934 | 1056 | sdata->u.ibss.privacy = params->privacy; |
267335d6 | 1057 | sdata->u.ibss.control_port = params->control_port; |
fbd2c8dc | 1058 | sdata->u.ibss.basic_rates = params->basic_rates; |
dd5b4cc7 FF |
1059 | memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, |
1060 | sizeof(params->mcast_rate)); | |
fffd0934 | 1061 | |
57c4d7b4 JB |
1062 | sdata->vif.bss_conf.beacon_int = params->beacon_interval; |
1063 | ||
683b6d3b JB |
1064 | sdata->u.ibss.channel = params->chandef.chan; |
1065 | sdata->u.ibss.channel_type = | |
1066 | cfg80211_get_chandef_type(¶ms->chandef); | |
af8cdcd8 JB |
1067 | sdata->u.ibss.fixed_channel = params->channel_fixed; |
1068 | ||
1069 | if (params->ie) { | |
1070 | sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, | |
1071 | GFP_KERNEL); | |
1072 | if (sdata->u.ibss.ie) | |
1073 | sdata->u.ibss.ie_len = params->ie_len; | |
1074 | } | |
1075 | ||
af8cdcd8 JB |
1076 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; |
1077 | sdata->u.ibss.ibss_join_req = jiffies; | |
1078 | ||
badecb00 | 1079 | memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); |
0e41f715 JB |
1080 | sdata->u.ibss.ssid_len = params->ssid_len; |
1081 | ||
7da7cc1d JB |
1082 | mutex_unlock(&sdata->u.ibss.mtx); |
1083 | ||
ff3cc5f4 SW |
1084 | /* |
1085 | * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is | |
1086 | * reserved, but an HT STA shall protect HT transmissions as though | |
1087 | * the HT Protection field were set to non-HT mixed mode. | |
1088 | * | |
1089 | * In an IBSS, the RIFS Mode field of the HT Operation element is | |
1090 | * also reserved, but an HT STA shall operate as though this field | |
1091 | * were set to 1. | |
1092 | */ | |
1093 | ||
1094 | sdata->vif.bss_conf.ht_operation_mode |= | |
1095 | IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | |
1096 | | IEEE80211_HT_PARAM_RIFS_MODE; | |
1097 | ||
1098 | changed |= BSS_CHANGED_HT; | |
1099 | ieee80211_bss_info_change_notify(sdata, changed); | |
1100 | ||
04ecd257 JB |
1101 | sdata->smps_mode = IEEE80211_SMPS_OFF; |
1102 | sdata->needed_rx_chains = sdata->local->rx_chains; | |
1103 | ||
64592c8f | 1104 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
af8cdcd8 JB |
1105 | |
1106 | return 0; | |
1107 | } | |
1108 | ||
1109 | int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) | |
1110 | { | |
5ea096c0 TP |
1111 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
1112 | struct ieee80211_local *local = sdata->local; | |
1113 | struct cfg80211_bss *cbss; | |
1114 | u16 capability; | |
7a17a33c | 1115 | int active_ibss; |
8bf11d8d | 1116 | struct sta_info *sta; |
c3ffeab4 | 1117 | struct beacon_data *presp; |
7a17a33c JB |
1118 | |
1119 | mutex_lock(&sdata->u.ibss.mtx); | |
5ea096c0 TP |
1120 | |
1121 | active_ibss = ieee80211_sta_active_ibss(sdata); | |
1122 | ||
1123 | if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) { | |
1124 | capability = WLAN_CAPABILITY_IBSS; | |
1125 | ||
1126 | if (ifibss->privacy) | |
1127 | capability |= WLAN_CAPABILITY_PRIVACY; | |
1128 | ||
1129 | cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->channel, | |
1130 | ifibss->bssid, ifibss->ssid, | |
1131 | ifibss->ssid_len, WLAN_CAPABILITY_IBSS | | |
1132 | WLAN_CAPABILITY_PRIVACY, | |
1133 | capability); | |
1134 | ||
1135 | if (cbss) { | |
1136 | cfg80211_unlink_bss(local->hw.wiphy, cbss); | |
5b112d3d | 1137 | cfg80211_put_bss(local->hw.wiphy, cbss); |
5ea096c0 TP |
1138 | } |
1139 | } | |
af8cdcd8 | 1140 | |
b78a4932 SW |
1141 | ifibss->state = IEEE80211_IBSS_MLME_SEARCH; |
1142 | memset(ifibss->bssid, 0, ETH_ALEN); | |
1143 | ifibss->ssid_len = 0; | |
1144 | ||
b998e8bb | 1145 | sta_info_flush(sdata); |
8bf11d8d JB |
1146 | |
1147 | spin_lock_bh(&ifibss->incomplete_lock); | |
1148 | while (!list_empty(&ifibss->incomplete_stations)) { | |
1149 | sta = list_first_entry(&ifibss->incomplete_stations, | |
1150 | struct sta_info, list); | |
1151 | list_del(&sta->list); | |
1152 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1153 | ||
1154 | sta_info_free(local, sta); | |
1155 | spin_lock_bh(&ifibss->incomplete_lock); | |
1156 | } | |
1157 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1158 | ||
86a2ea41 | 1159 | netif_carrier_off(sdata->dev); |
af8cdcd8 JB |
1160 | |
1161 | /* remove beacon */ | |
1162 | kfree(sdata->u.ibss.ie); | |
c3ffeab4 JB |
1163 | presp = rcu_dereference_protected(ifibss->presp, |
1164 | lockdep_is_held(&sdata->u.ibss.mtx)); | |
a9b3cd7f | 1165 | RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); |
8fc214ba | 1166 | sdata->vif.bss_conf.ibss_joined = false; |
c13a765b | 1167 | sdata->vif.bss_conf.ibss_creator = false; |
d6a83228 | 1168 | sdata->vif.bss_conf.enable_beacon = false; |
0ca54f6c | 1169 | sdata->vif.bss_conf.ssid_len = 0; |
d6a83228 | 1170 | clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); |
8fc214ba JB |
1171 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | |
1172 | BSS_CHANGED_IBSS); | |
af8cdcd8 | 1173 | synchronize_rcu(); |
c3ffeab4 | 1174 | kfree(presp); |
af8cdcd8 | 1175 | |
35f20c14 | 1176 | skb_queue_purge(&sdata->skb_queue); |
5cff20e6 | 1177 | |
bc05d19f | 1178 | del_timer_sync(&sdata->u.ibss.timer); |
7a17a33c JB |
1179 | |
1180 | mutex_unlock(&sdata->u.ibss.mtx); | |
bc05d19f | 1181 | |
af8cdcd8 JB |
1182 | return 0; |
1183 | } |