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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 | |
8d61ffa5 | 57 | sdata_assert_lock(sdata); |
7a17a33c | 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 | 76 | presp = rcu_dereference_protected(ifibss->presp, |
8d61ffa5 | 77 | lockdep_is_held(&sdata->wdev.mtx)); |
c3ffeab4 JB |
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 | |
3aede78a | 84 | chandef = ifibss->chandef; |
4bf88530 JB |
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 && |
0418a445 SW |
179 | chandef.width != NL80211_CHAN_WIDTH_5 && |
180 | chandef.width != NL80211_CHAN_WIDTH_10 && | |
683b6d3b | 181 | sband->ht_cap.ht_supported) { |
13c40c54 AS |
182 | pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, |
183 | sband->ht_cap.cap); | |
0d894ec5 AN |
184 | /* |
185 | * Note: According to 802.11n-2009 9.13.3.1, HT Protection | |
186 | * field and RIFS Mode are reserved in IBSS mode, therefore | |
187 | * keep them at 0 | |
188 | */ | |
074d46d1 | 189 | pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap, |
4bf88530 | 190 | &chandef, 0); |
13c40c54 AS |
191 | } |
192 | ||
32c5057b | 193 | if (local->hw.queues >= IEEE80211_NUM_ACS) { |
9eba6125 BR |
194 | *pos++ = WLAN_EID_VENDOR_SPECIFIC; |
195 | *pos++ = 7; /* len */ | |
196 | *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */ | |
197 | *pos++ = 0x50; | |
198 | *pos++ = 0xf2; | |
199 | *pos++ = 2; /* WME */ | |
200 | *pos++ = 0; /* WME info */ | |
201 | *pos++ = 1; /* WME ver */ | |
202 | *pos++ = 0; /* U-APSD no in use */ | |
203 | } | |
204 | ||
c3ffeab4 JB |
205 | presp->head_len = pos - presp->head; |
206 | if (WARN_ON(presp->head_len > frame_len)) | |
207 | return; | |
208 | ||
209 | rcu_assign_pointer(ifibss->presp, presp); | |
46900298 | 210 | |
d6a83228 | 211 | sdata->vif.bss_conf.enable_beacon = true; |
2d0ddec5 | 212 | sdata->vif.bss_conf.beacon_int = beacon_int; |
fbd2c8dc | 213 | sdata->vif.bss_conf.basic_rates = basic_rates; |
0ca54f6c MP |
214 | sdata->vif.bss_conf.ssid_len = ifibss->ssid_len; |
215 | memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len); | |
2d0ddec5 JB |
216 | bss_change = BSS_CHANGED_BEACON_INT; |
217 | bss_change |= ieee80211_reset_erp_info(sdata); | |
218 | bss_change |= BSS_CHANGED_BSSID; | |
219 | bss_change |= BSS_CHANGED_BEACON; | |
220 | bss_change |= BSS_CHANGED_BEACON_ENABLED; | |
392cfdb1 | 221 | bss_change |= BSS_CHANGED_BASIC_RATES; |
13c40c54 | 222 | bss_change |= BSS_CHANGED_HT; |
8fc214ba | 223 | bss_change |= BSS_CHANGED_IBSS; |
0ca54f6c | 224 | bss_change |= BSS_CHANGED_SSID; |
2f91a967 SW |
225 | |
226 | /* | |
227 | * In 5 GHz/802.11a, we can always use short slot time. | |
228 | * (IEEE 802.11-2012 18.3.8.7) | |
229 | * | |
230 | * In 2.4GHz, we must always use long slots in IBSS for compatibility | |
231 | * reasons. | |
232 | * (IEEE 802.11-2012 19.4.5) | |
233 | * | |
234 | * HT follows these specifications (IEEE 802.11-2012 20.3.18) | |
235 | */ | |
236 | sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ; | |
237 | bss_change |= BSS_CHANGED_ERP_SLOT; | |
238 | ||
8fc214ba | 239 | sdata->vif.bss_conf.ibss_joined = true; |
c13a765b | 240 | sdata->vif.bss_conf.ibss_creator = creator; |
2d0ddec5 | 241 | ieee80211_bss_info_change_notify(sdata, bss_change); |
46900298 | 242 | |
b59066a2 | 243 | ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates); |
46900298 | 244 | |
46900298 | 245 | ifibss->state = IEEE80211_IBSS_MLME_JOINED; |
af8cdcd8 JB |
246 | mod_timer(&ifibss->timer, |
247 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 | 248 | |
273686d6 | 249 | bss = cfg80211_inform_bss_frame(local->hw.wiphy, chan, |
c3ffeab4 | 250 | mgmt, presp->head_len, 0, GFP_KERNEL); |
5b112d3d | 251 | cfg80211_put_bss(local->hw.wiphy, bss); |
86a2ea41 | 252 | netif_carrier_on(sdata->dev); |
af8cdcd8 | 253 | cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL); |
46900298 JB |
254 | } |
255 | ||
af8cdcd8 JB |
256 | static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
257 | struct ieee80211_bss *bss) | |
46900298 | 258 | { |
0c1ad2ca JB |
259 | struct cfg80211_bss *cbss = |
260 | container_of((void *)bss, struct cfg80211_bss, priv); | |
b59066a2 JB |
261 | struct ieee80211_supported_band *sband; |
262 | u32 basic_rates; | |
263 | int i, j; | |
0c1ad2ca | 264 | u16 beacon_int = cbss->beacon_interval; |
8cef2c9d JB |
265 | const struct cfg80211_bss_ies *ies; |
266 | u64 tsf; | |
57c4d7b4 | 267 | |
8d61ffa5 | 268 | sdata_assert_lock(sdata); |
7a17a33c | 269 | |
57c4d7b4 JB |
270 | if (beacon_int < 10) |
271 | beacon_int = 10; | |
272 | ||
0c1ad2ca | 273 | sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; |
b59066a2 JB |
274 | |
275 | basic_rates = 0; | |
276 | ||
277 | for (i = 0; i < bss->supp_rates_len; i++) { | |
278 | int rate = (bss->supp_rates[i] & 0x7f) * 5; | |
279 | bool is_basic = !!(bss->supp_rates[i] & 0x80); | |
280 | ||
281 | for (j = 0; j < sband->n_bitrates; j++) { | |
282 | if (sband->bitrates[j].bitrate == rate) { | |
283 | if (is_basic) | |
284 | basic_rates |= BIT(j); | |
285 | break; | |
286 | } | |
287 | } | |
288 | } | |
289 | ||
8cef2c9d JB |
290 | rcu_read_lock(); |
291 | ies = rcu_dereference(cbss->ies); | |
292 | tsf = ies->tsf; | |
293 | rcu_read_unlock(); | |
294 | ||
0c1ad2ca | 295 | __ieee80211_sta_join_ibss(sdata, cbss->bssid, |
57c4d7b4 | 296 | beacon_int, |
0c1ad2ca | 297 | cbss->channel, |
b59066a2 | 298 | basic_rates, |
0c1ad2ca | 299 | cbss->capability, |
8cef2c9d | 300 | tsf, false); |
46900298 JB |
301 | } |
302 | ||
6d810f10 AQ |
303 | static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta, |
304 | bool auth) | |
8bf11d8d JB |
305 | __acquires(RCU) |
306 | { | |
307 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
308 | u8 addr[ETH_ALEN]; | |
309 | ||
310 | memcpy(addr, sta->sta.addr, ETH_ALEN); | |
311 | ||
bdcbd8e0 | 312 | ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr); |
8bf11d8d | 313 | |
83d5cc01 JB |
314 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); |
315 | sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); | |
267335d6 AQ |
316 | /* authorize the station only if the network is not RSN protected. If |
317 | * not wait for the userspace to authorize it */ | |
318 | if (!sta->sdata->u.ibss.control_port) | |
319 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); | |
8bf11d8d JB |
320 | |
321 | rate_control_rate_init(sta); | |
322 | ||
323 | /* If it fails, maybe we raced another insertion? */ | |
324 | if (sta_info_insert_rcu(sta)) | |
325 | return sta_info_get(sdata, addr); | |
452a6d22 | 326 | if (auth && !sdata->u.ibss.auth_frame_registrations) { |
bdcbd8e0 JB |
327 | ibss_dbg(sdata, |
328 | "TX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=1)\n", | |
2514ec86 | 329 | sdata->vif.addr, addr, sdata->u.ibss.bssid); |
700e8ea6 | 330 | ieee80211_send_auth(sdata, 1, WLAN_AUTH_OPEN, 0, NULL, 0, |
1672c0e3 | 331 | addr, sdata->u.ibss.bssid, NULL, 0, 0, 0); |
6d810f10 | 332 | } |
8bf11d8d JB |
333 | return sta; |
334 | } | |
335 | ||
336 | static struct sta_info * | |
337 | ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, | |
338 | const u8 *bssid, const u8 *addr, | |
6d810f10 | 339 | u32 supp_rates, bool auth) |
8bf11d8d JB |
340 | __acquires(RCU) |
341 | { | |
342 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
343 | struct ieee80211_local *local = sdata->local; | |
344 | struct sta_info *sta; | |
55de908a | 345 | struct ieee80211_chanctx_conf *chanctx_conf; |
b422c6cd | 346 | struct ieee80211_supported_band *sband; |
55de908a | 347 | int band; |
8bf11d8d JB |
348 | |
349 | /* | |
350 | * XXX: Consider removing the least recently used entry and | |
351 | * allow new one to be added. | |
352 | */ | |
353 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { | |
bdcbd8e0 | 354 | net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
e87cc472 | 355 | sdata->name, addr); |
8bf11d8d JB |
356 | rcu_read_lock(); |
357 | return NULL; | |
358 | } | |
359 | ||
360 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { | |
361 | rcu_read_lock(); | |
362 | return NULL; | |
363 | } | |
364 | ||
b203ca39 | 365 | if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) { |
8bf11d8d JB |
366 | rcu_read_lock(); |
367 | return NULL; | |
368 | } | |
369 | ||
55de908a JB |
370 | rcu_read_lock(); |
371 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
372 | if (WARN_ON_ONCE(!chanctx_conf)) | |
373 | return NULL; | |
4bf88530 | 374 | band = chanctx_conf->def.chan->band; |
55de908a JB |
375 | rcu_read_unlock(); |
376 | ||
8bf11d8d JB |
377 | sta = sta_info_alloc(sdata, addr, GFP_KERNEL); |
378 | if (!sta) { | |
379 | rcu_read_lock(); | |
380 | return NULL; | |
381 | } | |
382 | ||
383 | sta->last_rx = jiffies; | |
384 | ||
385 | /* make sure mandatory rates are always added */ | |
b422c6cd | 386 | sband = local->hw.wiphy->bands[band]; |
8bf11d8d | 387 | sta->sta.supp_rates[band] = supp_rates | |
b422c6cd | 388 | ieee80211_mandatory_rates(sband); |
8bf11d8d | 389 | |
6d810f10 AQ |
390 | return ieee80211_ibss_finish_sta(sta, auth); |
391 | } | |
392 | ||
2cc59e78 AQ |
393 | static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata, |
394 | struct ieee80211_mgmt *mgmt, | |
395 | size_t len) | |
396 | { | |
397 | u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code); | |
398 | ||
399 | if (len < IEEE80211_DEAUTH_FRAME_LEN) | |
400 | return; | |
401 | ||
402 | ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n", | |
403 | mgmt->sa, mgmt->da, mgmt->bssid, reason); | |
404 | sta_info_destroy_addr(sdata, mgmt->sa); | |
405 | } | |
406 | ||
6d810f10 AQ |
407 | static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, |
408 | struct ieee80211_mgmt *mgmt, | |
409 | size_t len) | |
410 | { | |
411 | u16 auth_alg, auth_transaction; | |
2cc59e78 AQ |
412 | struct sta_info *sta; |
413 | u8 deauth_frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; | |
6d810f10 | 414 | |
8d61ffa5 | 415 | sdata_assert_lock(sdata); |
6d810f10 AQ |
416 | |
417 | if (len < 24 + 6) | |
418 | return; | |
419 | ||
420 | auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); | |
421 | auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); | |
422 | ||
bdcbd8e0 JB |
423 | ibss_dbg(sdata, |
424 | "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n", | |
425 | mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction); | |
7bed2050 AQ |
426 | |
427 | if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) | |
428 | return; | |
429 | ||
6d810f10 | 430 | sta_info_destroy_addr(sdata, mgmt->sa); |
2cc59e78 | 431 | sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 0, false); |
6d810f10 AQ |
432 | rcu_read_unlock(); |
433 | ||
2cc59e78 AQ |
434 | /* |
435 | * if we have any problem in allocating the new station, we reply with a | |
436 | * DEAUTH frame to tell the other end that we had a problem | |
437 | */ | |
438 | if (!sta) { | |
439 | ieee80211_send_deauth_disassoc(sdata, sdata->u.ibss.bssid, | |
440 | IEEE80211_STYPE_DEAUTH, | |
441 | WLAN_REASON_UNSPECIFIED, true, | |
442 | deauth_frame_buf); | |
443 | return; | |
444 | } | |
445 | ||
6d810f10 AQ |
446 | /* |
447 | * IEEE 802.11 standard does not require authentication in IBSS | |
448 | * networks and most implementations do not seem to use it. | |
449 | * However, try to reply to authentication attempts if someone | |
450 | * has actually implemented this. | |
451 | */ | |
700e8ea6 | 452 | ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0, |
1672c0e3 | 453 | mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0); |
8bf11d8d JB |
454 | } |
455 | ||
46900298 | 456 | static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, |
d45c4172 | 457 | struct ieee80211_mgmt *mgmt, size_t len, |
46900298 | 458 | struct ieee80211_rx_status *rx_status, |
d45c4172 | 459 | struct ieee802_11_elems *elems) |
46900298 JB |
460 | { |
461 | struct ieee80211_local *local = sdata->local; | |
462 | int freq; | |
0c1ad2ca | 463 | struct cfg80211_bss *cbss; |
46900298 JB |
464 | struct ieee80211_bss *bss; |
465 | struct sta_info *sta; | |
466 | struct ieee80211_channel *channel; | |
467 | u64 beacon_timestamp, rx_timestamp; | |
468 | u32 supp_rates = 0; | |
469 | enum ieee80211_band band = rx_status->band; | |
13c40c54 AS |
470 | struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; |
471 | bool rates_updated = false; | |
46900298 | 472 | |
1cd8e88e | 473 | if (elems->ds_params) |
59eb21a6 BR |
474 | freq = ieee80211_channel_to_frequency(elems->ds_params[0], |
475 | band); | |
46900298 JB |
476 | else |
477 | freq = rx_status->freq; | |
478 | ||
479 | channel = ieee80211_get_channel(local->hw.wiphy, freq); | |
480 | ||
481 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
482 | return; | |
483 | ||
9eba6125 | 484 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC && |
b203ca39 | 485 | ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) { |
46900298 JB |
486 | |
487 | rcu_read_lock(); | |
abe60632 | 488 | sta = sta_info_get(sdata, mgmt->sa); |
46900298 | 489 | |
9eba6125 BR |
490 | if (elems->supp_rates) { |
491 | supp_rates = ieee80211_sta_get_rates(local, elems, | |
9ebb61a2 | 492 | band, NULL); |
9eba6125 BR |
493 | if (sta) { |
494 | u32 prev_rates; | |
495 | ||
496 | prev_rates = sta->sta.supp_rates[band]; | |
497 | /* make sure mandatory rates are always added */ | |
498 | sta->sta.supp_rates[band] = supp_rates | | |
b422c6cd | 499 | ieee80211_mandatory_rates(sband); |
46900298 | 500 | |
9eba6125 | 501 | if (sta->sta.supp_rates[band] != prev_rates) { |
bdcbd8e0 JB |
502 | ibss_dbg(sdata, |
503 | "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", | |
504 | sta->sta.addr, prev_rates, | |
505 | sta->sta.supp_rates[band]); | |
13c40c54 | 506 | rates_updated = true; |
9eba6125 | 507 | } |
8bf11d8d JB |
508 | } else { |
509 | rcu_read_unlock(); | |
9eba6125 | 510 | sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, |
6d810f10 | 511 | mgmt->sa, supp_rates, true); |
8bf11d8d | 512 | } |
34e89507 | 513 | } |
9eba6125 BR |
514 | |
515 | if (sta && elems->wmm_info) | |
c2c98fde | 516 | set_sta_flag(sta, WLAN_STA_WME); |
9eba6125 | 517 | |
074d46d1 | 518 | if (sta && elems->ht_operation && elems->ht_cap_elem && |
3aede78a SW |
519 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT && |
520 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 && | |
521 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) { | |
13c40c54 | 522 | /* we both use HT */ |
e1a0c6b3 | 523 | struct ieee80211_ht_cap htcap_ie; |
4bf88530 JB |
524 | struct cfg80211_chan_def chandef; |
525 | ||
526 | ieee80211_ht_oper_to_chandef(channel, | |
527 | elems->ht_operation, | |
528 | &chandef); | |
13c40c54 | 529 | |
e1a0c6b3 | 530 | memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie)); |
13c40c54 AS |
531 | |
532 | /* | |
533 | * fall back to HT20 if we don't use or use | |
534 | * the other extension channel | |
535 | */ | |
3aede78a SW |
536 | if (chandef.center_freq1 != |
537 | sdata->u.ibss.chandef.center_freq1) | |
e1a0c6b3 JB |
538 | htcap_ie.cap_info &= |
539 | cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40); | |
540 | ||
541 | rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap( | |
542 | sdata, sband, &htcap_ie, sta); | |
13c40c54 AS |
543 | } |
544 | ||
e687f61e AQ |
545 | if (sta && rates_updated) { |
546 | drv_sta_rc_update(local, sdata, &sta->sta, | |
547 | IEEE80211_RC_SUPP_RATES_CHANGED); | |
13c40c54 | 548 | rate_control_rate_init(sta); |
e687f61e | 549 | } |
13c40c54 | 550 | |
9eba6125 | 551 | rcu_read_unlock(); |
46900298 JB |
552 | } |
553 | ||
554 | bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, | |
d45c4172 | 555 | channel); |
46900298 JB |
556 | if (!bss) |
557 | return; | |
558 | ||
0c1ad2ca JB |
559 | cbss = container_of((void *)bss, struct cfg80211_bss, priv); |
560 | ||
8cef2c9d JB |
561 | /* same for beacon and probe response */ |
562 | beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp); | |
46900298 JB |
563 | |
564 | /* check if we need to merge IBSS */ | |
565 | ||
46900298 | 566 | /* we use a fixed BSSID */ |
a98bfec2 | 567 | if (sdata->u.ibss.fixed_bssid) |
46900298 JB |
568 | goto put_bss; |
569 | ||
570 | /* not an IBSS */ | |
0c1ad2ca | 571 | if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) |
46900298 JB |
572 | goto put_bss; |
573 | ||
574 | /* different channel */ | |
55de908a | 575 | if (sdata->u.ibss.fixed_channel && |
3aede78a | 576 | sdata->u.ibss.chandef.chan != cbss->channel) |
46900298 JB |
577 | goto put_bss; |
578 | ||
579 | /* different SSID */ | |
580 | if (elems->ssid_len != sdata->u.ibss.ssid_len || | |
581 | memcmp(elems->ssid, sdata->u.ibss.ssid, | |
582 | sdata->u.ibss.ssid_len)) | |
583 | goto put_bss; | |
584 | ||
34e8f082 | 585 | /* same BSSID */ |
b203ca39 | 586 | if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) |
34e8f082 AF |
587 | goto put_bss; |
588 | ||
f4bda337 TP |
589 | if (ieee80211_have_rx_timestamp(rx_status)) { |
590 | /* time when timestamp field was received */ | |
591 | rx_timestamp = | |
592 | ieee80211_calculate_rx_timestamp(local, rx_status, | |
593 | len + FCS_LEN, 24); | |
24487981 JB |
594 | } else { |
595 | /* | |
596 | * second best option: get current TSF | |
597 | * (will return -1 if not supported) | |
598 | */ | |
37a41b4a | 599 | rx_timestamp = drv_get_tsf(local, sdata); |
24487981 | 600 | } |
46900298 | 601 | |
bdcbd8e0 JB |
602 | ibss_dbg(sdata, |
603 | "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", | |
604 | mgmt->sa, mgmt->bssid, | |
605 | (unsigned long long)rx_timestamp, | |
606 | (unsigned long long)beacon_timestamp, | |
607 | (unsigned long long)(rx_timestamp - beacon_timestamp), | |
608 | jiffies); | |
46900298 JB |
609 | |
610 | if (beacon_timestamp > rx_timestamp) { | |
bdcbd8e0 JB |
611 | ibss_dbg(sdata, |
612 | "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", | |
613 | mgmt->bssid); | |
46900298 | 614 | ieee80211_sta_join_ibss(sdata, bss); |
9ebb61a2 | 615 | supp_rates = ieee80211_sta_get_rates(local, elems, band, NULL); |
34e89507 | 616 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, |
6d810f10 | 617 | supp_rates, true); |
8bf11d8d | 618 | rcu_read_unlock(); |
46900298 JB |
619 | } |
620 | ||
621 | put_bss: | |
622 | ieee80211_rx_bss_put(local, bss); | |
623 | } | |
624 | ||
8bf11d8d JB |
625 | void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, |
626 | const u8 *bssid, const u8 *addr, | |
627 | u32 supp_rates) | |
46900298 | 628 | { |
2e10d330 | 629 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
46900298 JB |
630 | struct ieee80211_local *local = sdata->local; |
631 | struct sta_info *sta; | |
55de908a | 632 | struct ieee80211_chanctx_conf *chanctx_conf; |
b422c6cd | 633 | struct ieee80211_supported_band *sband; |
55de908a | 634 | int band; |
46900298 | 635 | |
af8cdcd8 JB |
636 | /* |
637 | * XXX: Consider removing the least recently used entry and | |
638 | * allow new one to be added. | |
639 | */ | |
46900298 | 640 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { |
bdcbd8e0 | 641 | net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
e87cc472 | 642 | sdata->name, addr); |
8bf11d8d | 643 | return; |
46900298 JB |
644 | } |
645 | ||
2e10d330 | 646 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) |
8bf11d8d | 647 | return; |
2e10d330 | 648 | |
b203ca39 | 649 | if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) |
8bf11d8d | 650 | return; |
46900298 | 651 | |
55de908a JB |
652 | rcu_read_lock(); |
653 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
654 | if (WARN_ON_ONCE(!chanctx_conf)) { | |
655 | rcu_read_unlock(); | |
656 | return; | |
657 | } | |
4bf88530 | 658 | band = chanctx_conf->def.chan->band; |
55de908a JB |
659 | rcu_read_unlock(); |
660 | ||
8bf11d8d | 661 | sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); |
46900298 | 662 | if (!sta) |
8bf11d8d | 663 | return; |
46900298 | 664 | |
c8716d9d | 665 | sta->last_rx = jiffies; |
d9a7ddb0 | 666 | |
46900298 | 667 | /* make sure mandatory rates are always added */ |
b422c6cd | 668 | sband = local->hw.wiphy->bands[band]; |
46900298 | 669 | sta->sta.supp_rates[band] = supp_rates | |
b422c6cd | 670 | ieee80211_mandatory_rates(sband); |
46900298 | 671 | |
8bf11d8d JB |
672 | spin_lock(&ifibss->incomplete_lock); |
673 | list_add(&sta->list, &ifibss->incomplete_stations); | |
674 | spin_unlock(&ifibss->incomplete_lock); | |
675 | ieee80211_queue_work(&local->hw, &sdata->work); | |
46900298 JB |
676 | } |
677 | ||
678 | static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) | |
679 | { | |
680 | struct ieee80211_local *local = sdata->local; | |
681 | int active = 0; | |
682 | struct sta_info *sta; | |
683 | ||
8d61ffa5 | 684 | sdata_assert_lock(sdata); |
7a17a33c | 685 | |
46900298 JB |
686 | rcu_read_lock(); |
687 | ||
688 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
689 | if (sta->sdata == sdata && | |
690 | time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL, | |
691 | jiffies)) { | |
692 | active++; | |
693 | break; | |
694 | } | |
695 | } | |
696 | ||
697 | rcu_read_unlock(); | |
698 | ||
699 | return active; | |
700 | } | |
701 | ||
ce9058ae BP |
702 | /* |
703 | * This function is called with state == IEEE80211_IBSS_MLME_JOINED | |
704 | */ | |
46900298 JB |
705 | |
706 | static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) | |
707 | { | |
708 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
709 | ||
8d61ffa5 | 710 | sdata_assert_lock(sdata); |
7a17a33c | 711 | |
af8cdcd8 JB |
712 | mod_timer(&ifibss->timer, |
713 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 JB |
714 | |
715 | ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT); | |
af8cdcd8 | 716 | |
450aae3d S |
717 | if (time_before(jiffies, ifibss->last_scan_completed + |
718 | IEEE80211_IBSS_MERGE_INTERVAL)) | |
719 | return; | |
720 | ||
46900298 JB |
721 | if (ieee80211_sta_active_ibss(sdata)) |
722 | return; | |
723 | ||
c037b836 | 724 | if (ifibss->fixed_channel) |
46900298 JB |
725 | return; |
726 | ||
bdcbd8e0 JB |
727 | sdata_info(sdata, |
728 | "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); | |
46900298 | 729 | |
34bcf715 SG |
730 | ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len, |
731 | NULL); | |
46900298 JB |
732 | } |
733 | ||
af8cdcd8 | 734 | static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
735 | { |
736 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
46900298 | 737 | u8 bssid[ETH_ALEN]; |
46900298 JB |
738 | u16 capability; |
739 | int i; | |
740 | ||
8d61ffa5 | 741 | sdata_assert_lock(sdata); |
7a17a33c | 742 | |
af8cdcd8 | 743 | if (ifibss->fixed_bssid) { |
46900298 JB |
744 | memcpy(bssid, ifibss->bssid, ETH_ALEN); |
745 | } else { | |
746 | /* Generate random, not broadcast, locally administered BSSID. Mix in | |
747 | * own MAC address to make sure that devices that do not have proper | |
748 | * random number generator get different BSSID. */ | |
749 | get_random_bytes(bssid, ETH_ALEN); | |
750 | for (i = 0; i < ETH_ALEN; i++) | |
47846c9b | 751 | bssid[i] ^= sdata->vif.addr[i]; |
46900298 JB |
752 | bssid[0] &= ~0x01; |
753 | bssid[0] |= 0x02; | |
754 | } | |
755 | ||
bdcbd8e0 | 756 | sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); |
46900298 | 757 | |
46900298 JB |
758 | capability = WLAN_CAPABILITY_IBSS; |
759 | ||
fffd0934 | 760 | if (ifibss->privacy) |
46900298 JB |
761 | capability |= WLAN_CAPABILITY_PRIVACY; |
762 | else | |
763 | sdata->drop_unencrypted = 0; | |
764 | ||
57c4d7b4 | 765 | __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, |
3aede78a | 766 | ifibss->chandef.chan, ifibss->basic_rates, |
c13a765b | 767 | capability, 0, true); |
46900298 JB |
768 | } |
769 | ||
ce9058ae BP |
770 | /* |
771 | * This function is called with state == IEEE80211_IBSS_MLME_SEARCH | |
772 | */ | |
773 | ||
af8cdcd8 | 774 | static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
775 | { |
776 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
777 | struct ieee80211_local *local = sdata->local; | |
0c1ad2ca | 778 | struct cfg80211_bss *cbss; |
af8cdcd8 | 779 | struct ieee80211_channel *chan = NULL; |
46900298 JB |
780 | const u8 *bssid = NULL; |
781 | int active_ibss; | |
e0d61887 | 782 | u16 capability; |
46900298 | 783 | |
8d61ffa5 | 784 | sdata_assert_lock(sdata); |
7a17a33c | 785 | |
46900298 | 786 | active_ibss = ieee80211_sta_active_ibss(sdata); |
bdcbd8e0 | 787 | ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); |
46900298 JB |
788 | |
789 | if (active_ibss) | |
af8cdcd8 | 790 | return; |
46900298 | 791 | |
e0d61887 | 792 | capability = WLAN_CAPABILITY_IBSS; |
fffd0934 | 793 | if (ifibss->privacy) |
e0d61887 | 794 | capability |= WLAN_CAPABILITY_PRIVACY; |
af8cdcd8 JB |
795 | if (ifibss->fixed_bssid) |
796 | bssid = ifibss->bssid; | |
797 | if (ifibss->fixed_channel) | |
3aede78a | 798 | chan = ifibss->chandef.chan; |
af8cdcd8 | 799 | if (!is_zero_ether_addr(ifibss->bssid)) |
46900298 | 800 | bssid = ifibss->bssid; |
0c1ad2ca JB |
801 | cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, |
802 | ifibss->ssid, ifibss->ssid_len, | |
803 | WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY, | |
804 | capability); | |
805 | ||
806 | if (cbss) { | |
807 | struct ieee80211_bss *bss; | |
46900298 | 808 | |
0c1ad2ca | 809 | bss = (void *)cbss->priv; |
bdcbd8e0 JB |
810 | ibss_dbg(sdata, |
811 | "sta_find_ibss: selected %pM current %pM\n", | |
812 | cbss->bssid, ifibss->bssid); | |
813 | sdata_info(sdata, | |
814 | "Selected IBSS BSSID %pM based on configured SSID\n", | |
815 | cbss->bssid); | |
46900298 | 816 | |
af8cdcd8 | 817 | ieee80211_sta_join_ibss(sdata, bss); |
46900298 | 818 | ieee80211_rx_bss_put(local, bss); |
af8cdcd8 | 819 | return; |
d419b9f0 | 820 | } |
46900298 | 821 | |
bdcbd8e0 | 822 | ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); |
46900298 JB |
823 | |
824 | /* Selected IBSS not found in current scan results - try to scan */ | |
ce9058ae | 825 | if (time_after(jiffies, ifibss->last_scan_completed + |
46900298 | 826 | IEEE80211_SCAN_INTERVAL)) { |
bdcbd8e0 | 827 | sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); |
46900298 | 828 | |
34bcf715 SG |
829 | ieee80211_request_ibss_scan(sdata, ifibss->ssid, |
830 | ifibss->ssid_len, chan); | |
ce9058ae | 831 | } else { |
46900298 JB |
832 | int interval = IEEE80211_SCAN_INTERVAL; |
833 | ||
834 | if (time_after(jiffies, ifibss->ibss_join_req + | |
55de908a JB |
835 | IEEE80211_IBSS_JOIN_TIMEOUT)) |
836 | ieee80211_sta_create_ibss(sdata); | |
46900298 | 837 | |
af8cdcd8 JB |
838 | mod_timer(&ifibss->timer, |
839 | round_jiffies(jiffies + interval)); | |
46900298 | 840 | } |
46900298 JB |
841 | } |
842 | ||
843 | static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, | |
c269a203 | 844 | struct sk_buff *req) |
46900298 | 845 | { |
c269a203 | 846 | struct ieee80211_mgmt *mgmt = (void *)req->data; |
46900298 JB |
847 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
848 | struct ieee80211_local *local = sdata->local; | |
c269a203 | 849 | int tx_last_beacon, len = req->len; |
46900298 | 850 | struct sk_buff *skb; |
c3ffeab4 | 851 | struct beacon_data *presp; |
46900298 JB |
852 | u8 *pos, *end; |
853 | ||
8d61ffa5 | 854 | sdata_assert_lock(sdata); |
7a17a33c | 855 | |
40b275b6 | 856 | presp = rcu_dereference_protected(ifibss->presp, |
8d61ffa5 | 857 | lockdep_is_held(&sdata->wdev.mtx)); |
40b275b6 | 858 | |
46900298 | 859 | if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || |
40b275b6 | 860 | len < 24 + 2 || !presp) |
46900298 JB |
861 | return; |
862 | ||
24487981 | 863 | tx_last_beacon = drv_tx_last_beacon(local); |
46900298 | 864 | |
bdcbd8e0 JB |
865 | ibss_dbg(sdata, |
866 | "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n", | |
867 | mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon); | |
46900298 | 868 | |
1ed76487 | 869 | if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) |
46900298 JB |
870 | return; |
871 | ||
b203ca39 | 872 | if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && |
888d04df | 873 | !is_broadcast_ether_addr(mgmt->bssid)) |
46900298 JB |
874 | return; |
875 | ||
876 | end = ((u8 *) mgmt) + len; | |
877 | pos = mgmt->u.probe_req.variable; | |
878 | if (pos[0] != WLAN_EID_SSID || | |
879 | pos + 2 + pos[1] > end) { | |
bdcbd8e0 JB |
880 | ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", |
881 | mgmt->sa); | |
46900298 JB |
882 | return; |
883 | } | |
884 | if (pos[1] != 0 && | |
885 | (pos[1] != ifibss->ssid_len || | |
0da780c2 | 886 | memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { |
46900298 JB |
887 | /* Ignore ProbeReq for foreign SSID */ |
888 | return; | |
889 | } | |
890 | ||
891 | /* Reply with ProbeResp */ | |
c3ffeab4 | 892 | skb = dev_alloc_skb(local->tx_headroom + presp->head_len); |
46900298 JB |
893 | if (!skb) |
894 | return; | |
895 | ||
c3ffeab4 JB |
896 | skb_reserve(skb, local->tx_headroom); |
897 | memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len); | |
898 | ||
899 | memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN); | |
900 | ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa); | |
62ae67be JB |
901 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
902 | ieee80211_tx_skb(sdata, skb); | |
46900298 JB |
903 | } |
904 | ||
d45c4172 EG |
905 | static |
906 | void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata, | |
907 | struct ieee80211_mgmt *mgmt, size_t len, | |
908 | struct ieee80211_rx_status *rx_status) | |
46900298 JB |
909 | { |
910 | size_t baselen; | |
911 | struct ieee802_11_elems elems; | |
912 | ||
d45c4172 EG |
913 | BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) != |
914 | offsetof(typeof(mgmt->u.beacon), variable)); | |
915 | ||
916 | /* | |
917 | * either beacon or probe_resp but the variable field is at the | |
918 | * same offset | |
919 | */ | |
46900298 JB |
920 | baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; |
921 | if (baselen > len) | |
922 | return; | |
923 | ||
924 | ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, | |
b2e506bf | 925 | false, &elems); |
46900298 | 926 | |
d45c4172 | 927 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); |
46900298 JB |
928 | } |
929 | ||
1fa57d01 JB |
930 | void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, |
931 | struct sk_buff *skb) | |
46900298 JB |
932 | { |
933 | struct ieee80211_rx_status *rx_status; | |
934 | struct ieee80211_mgmt *mgmt; | |
935 | u16 fc; | |
936 | ||
f1d58c25 | 937 | rx_status = IEEE80211_SKB_RXCB(skb); |
46900298 JB |
938 | mgmt = (struct ieee80211_mgmt *) skb->data; |
939 | fc = le16_to_cpu(mgmt->frame_control); | |
940 | ||
8d61ffa5 | 941 | sdata_lock(sdata); |
7a17a33c | 942 | |
c926d006 TH |
943 | if (!sdata->u.ibss.ssid_len) |
944 | goto mgmt_out; /* not ready to merge yet */ | |
945 | ||
46900298 JB |
946 | switch (fc & IEEE80211_FCTL_STYPE) { |
947 | case IEEE80211_STYPE_PROBE_REQ: | |
c269a203 | 948 | ieee80211_rx_mgmt_probe_req(sdata, skb); |
46900298 JB |
949 | break; |
950 | case IEEE80211_STYPE_PROBE_RESP: | |
46900298 | 951 | case IEEE80211_STYPE_BEACON: |
d45c4172 EG |
952 | ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len, |
953 | rx_status); | |
46900298 JB |
954 | break; |
955 | case IEEE80211_STYPE_AUTH: | |
956 | ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); | |
957 | break; | |
2cc59e78 AQ |
958 | case IEEE80211_STYPE_DEAUTH: |
959 | ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); | |
960 | break; | |
46900298 | 961 | } |
7a17a33c | 962 | |
c926d006 | 963 | mgmt_out: |
8d61ffa5 | 964 | sdata_unlock(sdata); |
46900298 JB |
965 | } |
966 | ||
1fa57d01 | 967 | void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) |
46900298 | 968 | { |
1fa57d01 | 969 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
8bf11d8d | 970 | struct sta_info *sta; |
46900298 | 971 | |
8d61ffa5 | 972 | sdata_lock(sdata); |
7a17a33c JB |
973 | |
974 | /* | |
975 | * Work could be scheduled after scan or similar | |
976 | * when we aren't even joined (or trying) with a | |
977 | * network. | |
978 | */ | |
979 | if (!ifibss->ssid_len) | |
980 | goto out; | |
46900298 | 981 | |
8bf11d8d JB |
982 | spin_lock_bh(&ifibss->incomplete_lock); |
983 | while (!list_empty(&ifibss->incomplete_stations)) { | |
984 | sta = list_first_entry(&ifibss->incomplete_stations, | |
985 | struct sta_info, list); | |
986 | list_del(&sta->list); | |
987 | spin_unlock_bh(&ifibss->incomplete_lock); | |
988 | ||
6d810f10 | 989 | ieee80211_ibss_finish_sta(sta, true); |
8bf11d8d JB |
990 | rcu_read_unlock(); |
991 | spin_lock_bh(&ifibss->incomplete_lock); | |
992 | } | |
993 | spin_unlock_bh(&ifibss->incomplete_lock); | |
994 | ||
46900298 JB |
995 | switch (ifibss->state) { |
996 | case IEEE80211_IBSS_MLME_SEARCH: | |
997 | ieee80211_sta_find_ibss(sdata); | |
998 | break; | |
999 | case IEEE80211_IBSS_MLME_JOINED: | |
1000 | ieee80211_sta_merge_ibss(sdata); | |
1001 | break; | |
1002 | default: | |
1003 | WARN_ON(1); | |
1004 | break; | |
1005 | } | |
46900298 | 1006 | |
7a17a33c | 1007 | out: |
8d61ffa5 | 1008 | sdata_unlock(sdata); |
3a4d4aa2 JB |
1009 | } |
1010 | ||
46900298 JB |
1011 | static void ieee80211_ibss_timer(unsigned long data) |
1012 | { | |
1013 | struct ieee80211_sub_if_data *sdata = | |
1014 | (struct ieee80211_sub_if_data *) data; | |
5bb644a0 | 1015 | |
a6182943 | 1016 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
5bb644a0 | 1017 | } |
5bb644a0 | 1018 | |
46900298 JB |
1019 | void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) |
1020 | { | |
1021 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1022 | ||
46900298 JB |
1023 | setup_timer(&ifibss->timer, ieee80211_ibss_timer, |
1024 | (unsigned long) sdata); | |
8bf11d8d JB |
1025 | INIT_LIST_HEAD(&ifibss->incomplete_stations); |
1026 | spin_lock_init(&ifibss->incomplete_lock); | |
46900298 JB |
1027 | } |
1028 | ||
1029 | /* scan finished notification */ | |
1030 | void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) | |
1031 | { | |
af8cdcd8 | 1032 | struct ieee80211_sub_if_data *sdata; |
46900298 | 1033 | |
29b4a4f7 JB |
1034 | mutex_lock(&local->iflist_mtx); |
1035 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 1036 | if (!ieee80211_sdata_running(sdata)) |
0e41f715 | 1037 | continue; |
af8cdcd8 JB |
1038 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
1039 | continue; | |
1040 | sdata->u.ibss.last_scan_completed = jiffies; | |
7a17a33c | 1041 | ieee80211_queue_work(&local->hw, &sdata->work); |
46900298 | 1042 | } |
29b4a4f7 | 1043 | mutex_unlock(&local->iflist_mtx); |
46900298 JB |
1044 | } |
1045 | ||
af8cdcd8 JB |
1046 | int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, |
1047 | struct cfg80211_ibss_params *params) | |
1048 | { | |
ff3cc5f4 | 1049 | u32 changed = 0; |
af8cdcd8 | 1050 | |
af8cdcd8 JB |
1051 | if (params->bssid) { |
1052 | memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); | |
1053 | sdata->u.ibss.fixed_bssid = true; | |
1054 | } else | |
1055 | sdata->u.ibss.fixed_bssid = false; | |
1056 | ||
fffd0934 | 1057 | sdata->u.ibss.privacy = params->privacy; |
267335d6 | 1058 | sdata->u.ibss.control_port = params->control_port; |
fbd2c8dc | 1059 | sdata->u.ibss.basic_rates = params->basic_rates; |
dd5b4cc7 FF |
1060 | memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, |
1061 | sizeof(params->mcast_rate)); | |
fffd0934 | 1062 | |
57c4d7b4 JB |
1063 | sdata->vif.bss_conf.beacon_int = params->beacon_interval; |
1064 | ||
3aede78a | 1065 | sdata->u.ibss.chandef = params->chandef; |
af8cdcd8 JB |
1066 | sdata->u.ibss.fixed_channel = params->channel_fixed; |
1067 | ||
1068 | if (params->ie) { | |
1069 | sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, | |
1070 | GFP_KERNEL); | |
1071 | if (sdata->u.ibss.ie) | |
1072 | sdata->u.ibss.ie_len = params->ie_len; | |
1073 | } | |
1074 | ||
af8cdcd8 JB |
1075 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; |
1076 | sdata->u.ibss.ibss_join_req = jiffies; | |
1077 | ||
badecb00 | 1078 | memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); |
0e41f715 JB |
1079 | sdata->u.ibss.ssid_len = params->ssid_len; |
1080 | ||
ff3cc5f4 SW |
1081 | /* |
1082 | * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is | |
1083 | * reserved, but an HT STA shall protect HT transmissions as though | |
1084 | * the HT Protection field were set to non-HT mixed mode. | |
1085 | * | |
1086 | * In an IBSS, the RIFS Mode field of the HT Operation element is | |
1087 | * also reserved, but an HT STA shall operate as though this field | |
1088 | * were set to 1. | |
1089 | */ | |
1090 | ||
1091 | sdata->vif.bss_conf.ht_operation_mode |= | |
1092 | IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | |
1093 | | IEEE80211_HT_PARAM_RIFS_MODE; | |
1094 | ||
1095 | changed |= BSS_CHANGED_HT; | |
1096 | ieee80211_bss_info_change_notify(sdata, changed); | |
1097 | ||
04ecd257 JB |
1098 | sdata->smps_mode = IEEE80211_SMPS_OFF; |
1099 | sdata->needed_rx_chains = sdata->local->rx_chains; | |
1100 | ||
64592c8f | 1101 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
af8cdcd8 JB |
1102 | |
1103 | return 0; | |
1104 | } | |
1105 | ||
1106 | int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) | |
1107 | { | |
5ea096c0 TP |
1108 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
1109 | struct ieee80211_local *local = sdata->local; | |
1110 | struct cfg80211_bss *cbss; | |
1111 | u16 capability; | |
7a17a33c | 1112 | int active_ibss; |
8bf11d8d | 1113 | struct sta_info *sta; |
c3ffeab4 | 1114 | struct beacon_data *presp; |
7a17a33c | 1115 | |
5ea096c0 TP |
1116 | active_ibss = ieee80211_sta_active_ibss(sdata); |
1117 | ||
1118 | if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) { | |
1119 | capability = WLAN_CAPABILITY_IBSS; | |
1120 | ||
1121 | if (ifibss->privacy) | |
1122 | capability |= WLAN_CAPABILITY_PRIVACY; | |
1123 | ||
3aede78a | 1124 | cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan, |
5ea096c0 TP |
1125 | ifibss->bssid, ifibss->ssid, |
1126 | ifibss->ssid_len, WLAN_CAPABILITY_IBSS | | |
1127 | WLAN_CAPABILITY_PRIVACY, | |
1128 | capability); | |
1129 | ||
1130 | if (cbss) { | |
1131 | cfg80211_unlink_bss(local->hw.wiphy, cbss); | |
5b112d3d | 1132 | cfg80211_put_bss(local->hw.wiphy, cbss); |
5ea096c0 TP |
1133 | } |
1134 | } | |
af8cdcd8 | 1135 | |
b78a4932 SW |
1136 | ifibss->state = IEEE80211_IBSS_MLME_SEARCH; |
1137 | memset(ifibss->bssid, 0, ETH_ALEN); | |
1138 | ifibss->ssid_len = 0; | |
1139 | ||
b998e8bb | 1140 | sta_info_flush(sdata); |
8bf11d8d JB |
1141 | |
1142 | spin_lock_bh(&ifibss->incomplete_lock); | |
1143 | while (!list_empty(&ifibss->incomplete_stations)) { | |
1144 | sta = list_first_entry(&ifibss->incomplete_stations, | |
1145 | struct sta_info, list); | |
1146 | list_del(&sta->list); | |
1147 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1148 | ||
1149 | sta_info_free(local, sta); | |
1150 | spin_lock_bh(&ifibss->incomplete_lock); | |
1151 | } | |
1152 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1153 | ||
86a2ea41 | 1154 | netif_carrier_off(sdata->dev); |
af8cdcd8 JB |
1155 | |
1156 | /* remove beacon */ | |
1157 | kfree(sdata->u.ibss.ie); | |
c3ffeab4 | 1158 | presp = rcu_dereference_protected(ifibss->presp, |
8d61ffa5 | 1159 | lockdep_is_held(&sdata->wdev.mtx)); |
a9b3cd7f | 1160 | RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); |
8fc214ba | 1161 | sdata->vif.bss_conf.ibss_joined = false; |
c13a765b | 1162 | sdata->vif.bss_conf.ibss_creator = false; |
d6a83228 | 1163 | sdata->vif.bss_conf.enable_beacon = false; |
0ca54f6c | 1164 | sdata->vif.bss_conf.ssid_len = 0; |
d6a83228 | 1165 | clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); |
8fc214ba JB |
1166 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | |
1167 | BSS_CHANGED_IBSS); | |
af8cdcd8 | 1168 | synchronize_rcu(); |
c3ffeab4 | 1169 | kfree(presp); |
af8cdcd8 | 1170 | |
35f20c14 | 1171 | skb_queue_purge(&sdata->skb_queue); |
5cff20e6 | 1172 | |
bc05d19f | 1173 | del_timer_sync(&sdata->u.ibss.timer); |
7a17a33c | 1174 | |
af8cdcd8 JB |
1175 | return 0; |
1176 | } |