Commit | Line | Data |
---|---|---|
46900298 JB |
1 | /* |
2 | * IBSS mode implementation | |
3 | * Copyright 2003-2008, Jouni Malinen <j@w1.fi> | |
4 | * Copyright 2004, Instant802 Networks, Inc. | |
5 | * Copyright 2005, Devicescape Software, Inc. | |
6 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
7 | * Copyright 2007, Michael Wu <flamingice@sourmilk.net> | |
8 | * Copyright 2009, Johannes Berg <johannes@sipsolutions.net> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
13 | */ | |
14 | ||
15 | #include <linux/delay.h> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
46900298 JB |
17 | #include <linux/if_ether.h> |
18 | #include <linux/skbuff.h> | |
19 | #include <linux/if_arp.h> | |
20 | #include <linux/etherdevice.h> | |
21 | #include <linux/rtnetlink.h> | |
22 | #include <net/mac80211.h> | |
46900298 JB |
23 | |
24 | #include "ieee80211_i.h" | |
24487981 | 25 | #include "driver-ops.h" |
46900298 JB |
26 | #include "rate.h" |
27 | ||
28 | #define IEEE80211_SCAN_INTERVAL (2 * HZ) | |
46900298 JB |
29 | #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ) |
30 | ||
31 | #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ) | |
32 | #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ) | |
33 | ||
34 | #define IEEE80211_IBSS_MAX_STA_ENTRIES 128 | |
35 | ||
36 | ||
af8cdcd8 JB |
37 | static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
38 | const u8 *bssid, const int beacon_int, | |
39 | struct ieee80211_channel *chan, | |
b59066a2 | 40 | const u32 basic_rates, |
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; | |
2103dec1 | 46 | int rates_n = 0, i, ri; |
46900298 JB |
47 | struct ieee80211_mgmt *mgmt; |
48 | u8 *pos; | |
49 | struct ieee80211_supported_band *sband; | |
f446d10f | 50 | struct cfg80211_bss *bss; |
2103dec1 | 51 | u32 bss_change, rate_flags, rates = 0, rates_added = 0; |
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; | |
2103dec1 | 56 | int shift; |
24487981 | 57 | |
8d61ffa5 | 58 | sdata_assert_lock(sdata); |
7a17a33c | 59 | |
24487981 | 60 | /* Reset own TSF to allow time synchronization work. */ |
37a41b4a | 61 | drv_reset_tsf(local, sdata); |
46900298 | 62 | |
b203ca39 | 63 | if (!ether_addr_equal(ifibss->bssid, bssid)) |
b998e8bb | 64 | sta_info_flush(sdata); |
46900298 | 65 | |
49b5c7f4 JB |
66 | /* if merging, indicate to driver that we leave the old IBSS */ |
67 | if (sdata->vif.bss_conf.ibss_joined) { | |
68 | sdata->vif.bss_conf.ibss_joined = false; | |
c13a765b | 69 | sdata->vif.bss_conf.ibss_creator = false; |
1852d40e | 70 | sdata->vif.bss_conf.enable_beacon = false; |
86a2ea41 | 71 | netif_carrier_off(sdata->dev); |
1852d40e JB |
72 | ieee80211_bss_info_change_notify(sdata, |
73 | BSS_CHANGED_IBSS | | |
74 | BSS_CHANGED_BEACON_ENABLED); | |
49b5c7f4 JB |
75 | } |
76 | ||
c3ffeab4 | 77 | presp = rcu_dereference_protected(ifibss->presp, |
8d61ffa5 | 78 | lockdep_is_held(&sdata->wdev.mtx)); |
c3ffeab4 JB |
79 | rcu_assign_pointer(ifibss->presp, NULL); |
80 | if (presp) | |
81 | kfree_rcu(presp, rcu_head); | |
1852d40e | 82 | |
af8cdcd8 | 83 | sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0; |
46900298 | 84 | |
3aede78a | 85 | chandef = ifibss->chandef; |
4bf88530 JB |
86 | if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) { |
87 | chandef.width = NL80211_CHAN_WIDTH_20; | |
88 | chandef.center_freq1 = chan->center_freq; | |
89 | } | |
55de908a JB |
90 | |
91 | ieee80211_vif_release_channel(sdata); | |
4bf88530 | 92 | if (ieee80211_vif_use_channel(sdata, &chandef, |
55de908a JB |
93 | ifibss->fixed_channel ? |
94 | IEEE80211_CHANCTX_SHARED : | |
95 | IEEE80211_CHANCTX_EXCLUSIVE)) { | |
96 | sdata_info(sdata, "Failed to join IBSS, no channel context\n"); | |
97 | return; | |
13c40c54 | 98 | } |
55de908a JB |
99 | |
100 | memcpy(ifibss->bssid, bssid, ETH_ALEN); | |
57c4d7b4 | 101 | |
af8cdcd8 | 102 | sband = local->hw.wiphy->bands[chan->band]; |
2103dec1 | 103 | shift = ieee80211_vif_get_shift(&sdata->vif); |
46900298 JB |
104 | |
105 | /* Build IBSS probe response */ | |
c3ffeab4 JB |
106 | frame_len = sizeof(struct ieee80211_hdr_3addr) + |
107 | 12 /* struct ieee80211_mgmt.u.beacon */ + | |
108 | 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ + | |
109 | 2 + 8 /* max Supported Rates */ + | |
110 | 3 /* max DS params */ + | |
111 | 4 /* IBSS params */ + | |
112 | 2 + (IEEE80211_MAX_SUPP_RATES - 8) + | |
113 | 2 + sizeof(struct ieee80211_ht_cap) + | |
114 | 2 + sizeof(struct ieee80211_ht_operation) + | |
115 | ifibss->ie_len; | |
116 | presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL); | |
117 | if (!presp) | |
118 | return; | |
119 | ||
120 | presp->head = (void *)(presp + 1); | |
121 | ||
122 | mgmt = (void *) presp->head; | |
46900298 JB |
123 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
124 | IEEE80211_STYPE_PROBE_RESP); | |
e83e6541 | 125 | eth_broadcast_addr(mgmt->da); |
47846c9b | 126 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
46900298 | 127 | memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN); |
57c4d7b4 | 128 | mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int); |
707c1b4e | 129 | mgmt->u.beacon.timestamp = cpu_to_le64(tsf); |
46900298 JB |
130 | mgmt->u.beacon.capab_info = cpu_to_le16(capability); |
131 | ||
c3ffeab4 JB |
132 | pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable); |
133 | ||
46900298 JB |
134 | *pos++ = WLAN_EID_SSID; |
135 | *pos++ = ifibss->ssid_len; | |
136 | memcpy(pos, ifibss->ssid, ifibss->ssid_len); | |
c3ffeab4 | 137 | pos += ifibss->ssid_len; |
46900298 | 138 | |
2103dec1 SW |
139 | rate_flags = ieee80211_chandef_rate_flags(&chandef); |
140 | for (i = 0; i < sband->n_bitrates; i++) { | |
141 | if ((rate_flags & sband->bitrates[i].flags) != rate_flags) | |
142 | continue; | |
143 | ||
144 | rates |= BIT(i); | |
145 | rates_n++; | |
146 | } | |
147 | ||
46900298 | 148 | *pos++ = WLAN_EID_SUPP_RATES; |
2103dec1 SW |
149 | *pos++ = min_t(int, 8, rates_n); |
150 | for (ri = 0; ri < sband->n_bitrates; ri++) { | |
151 | int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, | |
152 | 5 * (1 << shift)); | |
c3ffeab4 | 153 | u8 basic = 0; |
2103dec1 SW |
154 | if (!(rates & BIT(ri))) |
155 | continue; | |
156 | ||
157 | if (basic_rates & BIT(ri)) | |
c3ffeab4 | 158 | basic = 0x80; |
2103dec1 SW |
159 | *pos++ = basic | (u8) rate; |
160 | if (++rates_added == 8) | |
161 | break; | |
c3ffeab4 | 162 | } |
46900298 JB |
163 | |
164 | if (sband->band == IEEE80211_BAND_2GHZ) { | |
46900298 JB |
165 | *pos++ = WLAN_EID_DS_PARAMS; |
166 | *pos++ = 1; | |
af8cdcd8 | 167 | *pos++ = ieee80211_frequency_to_channel(chan->center_freq); |
46900298 JB |
168 | } |
169 | ||
46900298 JB |
170 | *pos++ = WLAN_EID_IBSS_PARAMS; |
171 | *pos++ = 2; | |
172 | /* FIX: set ATIM window based on scan results */ | |
173 | *pos++ = 0; | |
174 | *pos++ = 0; | |
175 | ||
2103dec1 SW |
176 | /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */ |
177 | if (rates_n > 8) { | |
46900298 | 178 | *pos++ = WLAN_EID_EXT_SUPP_RATES; |
2103dec1 SW |
179 | *pos++ = rates_n - 8; |
180 | for (; ri < sband->n_bitrates; ri++) { | |
181 | int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, | |
182 | 5 * (1 << shift)); | |
c3ffeab4 | 183 | u8 basic = 0; |
2103dec1 SW |
184 | if (!(rates & BIT(ri))) |
185 | continue; | |
186 | ||
187 | if (basic_rates & BIT(ri)) | |
c3ffeab4 | 188 | basic = 0x80; |
2103dec1 | 189 | *pos++ = basic | (u8) rate; |
c3ffeab4 | 190 | } |
46900298 JB |
191 | } |
192 | ||
c3ffeab4 JB |
193 | if (ifibss->ie_len) { |
194 | memcpy(pos, ifibss->ie, ifibss->ie_len); | |
195 | pos += ifibss->ie_len; | |
196 | } | |
af8cdcd8 | 197 | |
13c40c54 | 198 | /* add HT capability and information IEs */ |
4bf88530 | 199 | if (chandef.width != NL80211_CHAN_WIDTH_20_NOHT && |
0418a445 SW |
200 | chandef.width != NL80211_CHAN_WIDTH_5 && |
201 | chandef.width != NL80211_CHAN_WIDTH_10 && | |
683b6d3b | 202 | sband->ht_cap.ht_supported) { |
822854b0 SW |
203 | struct ieee80211_sta_ht_cap ht_cap; |
204 | ||
205 | memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); | |
206 | ieee80211_apply_htcap_overrides(sdata, &ht_cap); | |
207 | ||
208 | pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); | |
0d894ec5 AN |
209 | /* |
210 | * Note: According to 802.11n-2009 9.13.3.1, HT Protection | |
211 | * field and RIFS Mode are reserved in IBSS mode, therefore | |
212 | * keep them at 0 | |
213 | */ | |
074d46d1 | 214 | pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap, |
4bf88530 | 215 | &chandef, 0); |
13c40c54 AS |
216 | } |
217 | ||
32c5057b | 218 | if (local->hw.queues >= IEEE80211_NUM_ACS) { |
9eba6125 BR |
219 | *pos++ = WLAN_EID_VENDOR_SPECIFIC; |
220 | *pos++ = 7; /* len */ | |
221 | *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */ | |
222 | *pos++ = 0x50; | |
223 | *pos++ = 0xf2; | |
224 | *pos++ = 2; /* WME */ | |
225 | *pos++ = 0; /* WME info */ | |
226 | *pos++ = 1; /* WME ver */ | |
227 | *pos++ = 0; /* U-APSD no in use */ | |
228 | } | |
229 | ||
c3ffeab4 JB |
230 | presp->head_len = pos - presp->head; |
231 | if (WARN_ON(presp->head_len > frame_len)) | |
232 | return; | |
233 | ||
234 | rcu_assign_pointer(ifibss->presp, presp); | |
46900298 | 235 | |
d6a83228 | 236 | sdata->vif.bss_conf.enable_beacon = true; |
2d0ddec5 | 237 | sdata->vif.bss_conf.beacon_int = beacon_int; |
fbd2c8dc | 238 | sdata->vif.bss_conf.basic_rates = basic_rates; |
0ca54f6c MP |
239 | sdata->vif.bss_conf.ssid_len = ifibss->ssid_len; |
240 | memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len); | |
2d0ddec5 JB |
241 | bss_change = BSS_CHANGED_BEACON_INT; |
242 | bss_change |= ieee80211_reset_erp_info(sdata); | |
243 | bss_change |= BSS_CHANGED_BSSID; | |
244 | bss_change |= BSS_CHANGED_BEACON; | |
245 | bss_change |= BSS_CHANGED_BEACON_ENABLED; | |
392cfdb1 | 246 | bss_change |= BSS_CHANGED_BASIC_RATES; |
13c40c54 | 247 | bss_change |= BSS_CHANGED_HT; |
8fc214ba | 248 | bss_change |= BSS_CHANGED_IBSS; |
0ca54f6c | 249 | bss_change |= BSS_CHANGED_SSID; |
2f91a967 SW |
250 | |
251 | /* | |
252 | * In 5 GHz/802.11a, we can always use short slot time. | |
253 | * (IEEE 802.11-2012 18.3.8.7) | |
254 | * | |
255 | * In 2.4GHz, we must always use long slots in IBSS for compatibility | |
256 | * reasons. | |
257 | * (IEEE 802.11-2012 19.4.5) | |
258 | * | |
259 | * HT follows these specifications (IEEE 802.11-2012 20.3.18) | |
260 | */ | |
261 | sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ; | |
262 | bss_change |= BSS_CHANGED_ERP_SLOT; | |
263 | ||
8fc214ba | 264 | sdata->vif.bss_conf.ibss_joined = true; |
c13a765b | 265 | sdata->vif.bss_conf.ibss_creator = creator; |
2d0ddec5 | 266 | ieee80211_bss_info_change_notify(sdata, bss_change); |
46900298 | 267 | |
2103dec1 | 268 | ieee80211_sta_def_wmm_params(sdata, rates, supp_rates); |
46900298 | 269 | |
46900298 | 270 | ifibss->state = IEEE80211_IBSS_MLME_JOINED; |
af8cdcd8 JB |
271 | mod_timer(&ifibss->timer, |
272 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 | 273 | |
273686d6 | 274 | bss = cfg80211_inform_bss_frame(local->hw.wiphy, chan, |
c3ffeab4 | 275 | mgmt, presp->head_len, 0, GFP_KERNEL); |
5b112d3d | 276 | cfg80211_put_bss(local->hw.wiphy, bss); |
86a2ea41 | 277 | netif_carrier_on(sdata->dev); |
af8cdcd8 | 278 | cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL); |
46900298 JB |
279 | } |
280 | ||
af8cdcd8 JB |
281 | static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
282 | struct ieee80211_bss *bss) | |
46900298 | 283 | { |
0c1ad2ca JB |
284 | struct cfg80211_bss *cbss = |
285 | container_of((void *)bss, struct cfg80211_bss, priv); | |
b59066a2 JB |
286 | struct ieee80211_supported_band *sband; |
287 | u32 basic_rates; | |
288 | int i, j; | |
0c1ad2ca | 289 | u16 beacon_int = cbss->beacon_interval; |
8cef2c9d JB |
290 | const struct cfg80211_bss_ies *ies; |
291 | u64 tsf; | |
2103dec1 SW |
292 | u32 rate_flags; |
293 | int shift; | |
57c4d7b4 | 294 | |
8d61ffa5 | 295 | sdata_assert_lock(sdata); |
7a17a33c | 296 | |
57c4d7b4 JB |
297 | if (beacon_int < 10) |
298 | beacon_int = 10; | |
299 | ||
0c1ad2ca | 300 | sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; |
2103dec1 SW |
301 | rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef); |
302 | shift = ieee80211_vif_get_shift(&sdata->vif); | |
b59066a2 JB |
303 | |
304 | basic_rates = 0; | |
305 | ||
306 | for (i = 0; i < bss->supp_rates_len; i++) { | |
2103dec1 | 307 | int rate = bss->supp_rates[i] & 0x7f; |
b59066a2 JB |
308 | bool is_basic = !!(bss->supp_rates[i] & 0x80); |
309 | ||
310 | for (j = 0; j < sband->n_bitrates; j++) { | |
2103dec1 SW |
311 | int brate; |
312 | if ((rate_flags & sband->bitrates[j].flags) | |
313 | != rate_flags) | |
314 | continue; | |
315 | ||
316 | brate = DIV_ROUND_UP(sband->bitrates[j].bitrate, | |
317 | 5 * (1 << shift)); | |
318 | if (brate == rate) { | |
b59066a2 JB |
319 | if (is_basic) |
320 | basic_rates |= BIT(j); | |
321 | break; | |
322 | } | |
323 | } | |
324 | } | |
325 | ||
8cef2c9d JB |
326 | rcu_read_lock(); |
327 | ies = rcu_dereference(cbss->ies); | |
328 | tsf = ies->tsf; | |
329 | rcu_read_unlock(); | |
330 | ||
0c1ad2ca | 331 | __ieee80211_sta_join_ibss(sdata, cbss->bssid, |
57c4d7b4 | 332 | beacon_int, |
0c1ad2ca | 333 | cbss->channel, |
b59066a2 | 334 | basic_rates, |
0c1ad2ca | 335 | cbss->capability, |
8cef2c9d | 336 | tsf, false); |
46900298 JB |
337 | } |
338 | ||
52874a5e | 339 | static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta) |
8bf11d8d JB |
340 | __acquires(RCU) |
341 | { | |
342 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
343 | u8 addr[ETH_ALEN]; | |
344 | ||
345 | memcpy(addr, sta->sta.addr, ETH_ALEN); | |
346 | ||
bdcbd8e0 | 347 | ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr); |
8bf11d8d | 348 | |
83d5cc01 JB |
349 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); |
350 | sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); | |
267335d6 AQ |
351 | /* authorize the station only if the network is not RSN protected. If |
352 | * not wait for the userspace to authorize it */ | |
353 | if (!sta->sdata->u.ibss.control_port) | |
354 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); | |
8bf11d8d JB |
355 | |
356 | rate_control_rate_init(sta); | |
357 | ||
358 | /* If it fails, maybe we raced another insertion? */ | |
359 | if (sta_info_insert_rcu(sta)) | |
360 | return sta_info_get(sdata, addr); | |
361 | return sta; | |
362 | } | |
363 | ||
364 | static struct sta_info * | |
52874a5e AQ |
365 | ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid, |
366 | const u8 *addr, u32 supp_rates) | |
8bf11d8d JB |
367 | __acquires(RCU) |
368 | { | |
369 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
370 | struct ieee80211_local *local = sdata->local; | |
371 | struct sta_info *sta; | |
55de908a | 372 | struct ieee80211_chanctx_conf *chanctx_conf; |
b422c6cd | 373 | struct ieee80211_supported_band *sband; |
55de908a | 374 | int band; |
8bf11d8d JB |
375 | |
376 | /* | |
377 | * XXX: Consider removing the least recently used entry and | |
378 | * allow new one to be added. | |
379 | */ | |
380 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { | |
bdcbd8e0 | 381 | net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
e87cc472 | 382 | sdata->name, addr); |
8bf11d8d JB |
383 | rcu_read_lock(); |
384 | return NULL; | |
385 | } | |
386 | ||
387 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { | |
388 | rcu_read_lock(); | |
389 | return NULL; | |
390 | } | |
391 | ||
b203ca39 | 392 | if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) { |
8bf11d8d JB |
393 | rcu_read_lock(); |
394 | return NULL; | |
395 | } | |
396 | ||
55de908a JB |
397 | rcu_read_lock(); |
398 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
399 | if (WARN_ON_ONCE(!chanctx_conf)) | |
400 | return NULL; | |
4bf88530 | 401 | band = chanctx_conf->def.chan->band; |
55de908a JB |
402 | rcu_read_unlock(); |
403 | ||
8bf11d8d JB |
404 | sta = sta_info_alloc(sdata, addr, GFP_KERNEL); |
405 | if (!sta) { | |
406 | rcu_read_lock(); | |
407 | return NULL; | |
408 | } | |
409 | ||
410 | sta->last_rx = jiffies; | |
411 | ||
412 | /* make sure mandatory rates are always added */ | |
b422c6cd | 413 | sband = local->hw.wiphy->bands[band]; |
8bf11d8d | 414 | sta->sta.supp_rates[band] = supp_rates | |
b422c6cd | 415 | ieee80211_mandatory_rates(sband); |
8bf11d8d | 416 | |
52874a5e | 417 | return ieee80211_ibss_finish_sta(sta); |
6d810f10 AQ |
418 | } |
419 | ||
2cc59e78 AQ |
420 | static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata, |
421 | struct ieee80211_mgmt *mgmt, | |
422 | size_t len) | |
423 | { | |
424 | u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code); | |
425 | ||
426 | if (len < IEEE80211_DEAUTH_FRAME_LEN) | |
427 | return; | |
428 | ||
429 | ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n", | |
430 | mgmt->sa, mgmt->da, mgmt->bssid, reason); | |
431 | sta_info_destroy_addr(sdata, mgmt->sa); | |
432 | } | |
433 | ||
6d810f10 AQ |
434 | static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, |
435 | struct ieee80211_mgmt *mgmt, | |
436 | size_t len) | |
437 | { | |
438 | u16 auth_alg, auth_transaction; | |
439 | ||
8d61ffa5 | 440 | sdata_assert_lock(sdata); |
6d810f10 AQ |
441 | |
442 | if (len < 24 + 6) | |
443 | return; | |
444 | ||
445 | auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); | |
446 | auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); | |
447 | ||
bdcbd8e0 JB |
448 | ibss_dbg(sdata, |
449 | "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n", | |
450 | mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction); | |
7bed2050 AQ |
451 | |
452 | if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) | |
453 | return; | |
454 | ||
6d810f10 AQ |
455 | /* |
456 | * IEEE 802.11 standard does not require authentication in IBSS | |
457 | * networks and most implementations do not seem to use it. | |
458 | * However, try to reply to authentication attempts if someone | |
459 | * has actually implemented this. | |
460 | */ | |
700e8ea6 | 461 | ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0, |
1672c0e3 | 462 | mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0); |
8bf11d8d JB |
463 | } |
464 | ||
46900298 | 465 | static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, |
d45c4172 | 466 | struct ieee80211_mgmt *mgmt, size_t len, |
46900298 | 467 | struct ieee80211_rx_status *rx_status, |
d45c4172 | 468 | struct ieee802_11_elems *elems) |
46900298 JB |
469 | { |
470 | struct ieee80211_local *local = sdata->local; | |
471 | int freq; | |
0c1ad2ca | 472 | struct cfg80211_bss *cbss; |
46900298 JB |
473 | struct ieee80211_bss *bss; |
474 | struct sta_info *sta; | |
475 | struct ieee80211_channel *channel; | |
476 | u64 beacon_timestamp, rx_timestamp; | |
477 | u32 supp_rates = 0; | |
478 | enum ieee80211_band band = rx_status->band; | |
13c40c54 AS |
479 | struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; |
480 | bool rates_updated = false; | |
46900298 | 481 | |
1cd8e88e | 482 | if (elems->ds_params) |
59eb21a6 BR |
483 | freq = ieee80211_channel_to_frequency(elems->ds_params[0], |
484 | band); | |
46900298 JB |
485 | else |
486 | freq = rx_status->freq; | |
487 | ||
488 | channel = ieee80211_get_channel(local->hw.wiphy, freq); | |
489 | ||
490 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
491 | return; | |
492 | ||
9eba6125 | 493 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC && |
b203ca39 | 494 | ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) { |
46900298 JB |
495 | |
496 | rcu_read_lock(); | |
abe60632 | 497 | sta = sta_info_get(sdata, mgmt->sa); |
46900298 | 498 | |
9eba6125 | 499 | if (elems->supp_rates) { |
2103dec1 | 500 | supp_rates = ieee80211_sta_get_rates(sdata, elems, |
9ebb61a2 | 501 | band, NULL); |
9eba6125 BR |
502 | if (sta) { |
503 | u32 prev_rates; | |
504 | ||
505 | prev_rates = sta->sta.supp_rates[band]; | |
506 | /* make sure mandatory rates are always added */ | |
507 | sta->sta.supp_rates[band] = supp_rates | | |
b422c6cd | 508 | ieee80211_mandatory_rates(sband); |
46900298 | 509 | |
9eba6125 | 510 | if (sta->sta.supp_rates[band] != prev_rates) { |
bdcbd8e0 JB |
511 | ibss_dbg(sdata, |
512 | "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", | |
513 | sta->sta.addr, prev_rates, | |
514 | sta->sta.supp_rates[band]); | |
13c40c54 | 515 | rates_updated = true; |
9eba6125 | 516 | } |
8bf11d8d JB |
517 | } else { |
518 | rcu_read_unlock(); | |
9eba6125 | 519 | sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, |
52874a5e | 520 | mgmt->sa, supp_rates); |
8bf11d8d | 521 | } |
34e89507 | 522 | } |
9eba6125 BR |
523 | |
524 | if (sta && elems->wmm_info) | |
c2c98fde | 525 | set_sta_flag(sta, WLAN_STA_WME); |
9eba6125 | 526 | |
074d46d1 | 527 | if (sta && elems->ht_operation && elems->ht_cap_elem && |
3aede78a SW |
528 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT && |
529 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 && | |
530 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) { | |
13c40c54 | 531 | /* we both use HT */ |
e1a0c6b3 | 532 | struct ieee80211_ht_cap htcap_ie; |
4bf88530 JB |
533 | struct cfg80211_chan_def chandef; |
534 | ||
535 | ieee80211_ht_oper_to_chandef(channel, | |
536 | elems->ht_operation, | |
537 | &chandef); | |
13c40c54 | 538 | |
e1a0c6b3 | 539 | memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie)); |
13c40c54 AS |
540 | |
541 | /* | |
542 | * fall back to HT20 if we don't use or use | |
543 | * the other extension channel | |
544 | */ | |
3aede78a SW |
545 | if (chandef.center_freq1 != |
546 | sdata->u.ibss.chandef.center_freq1) | |
e1a0c6b3 JB |
547 | htcap_ie.cap_info &= |
548 | cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40); | |
549 | ||
550 | rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap( | |
551 | sdata, sband, &htcap_ie, sta); | |
13c40c54 AS |
552 | } |
553 | ||
e687f61e AQ |
554 | if (sta && rates_updated) { |
555 | drv_sta_rc_update(local, sdata, &sta->sta, | |
556 | IEEE80211_RC_SUPP_RATES_CHANGED); | |
13c40c54 | 557 | rate_control_rate_init(sta); |
e687f61e | 558 | } |
13c40c54 | 559 | |
9eba6125 | 560 | rcu_read_unlock(); |
46900298 JB |
561 | } |
562 | ||
563 | bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, | |
d45c4172 | 564 | channel); |
46900298 JB |
565 | if (!bss) |
566 | return; | |
567 | ||
0c1ad2ca JB |
568 | cbss = container_of((void *)bss, struct cfg80211_bss, priv); |
569 | ||
8cef2c9d JB |
570 | /* same for beacon and probe response */ |
571 | beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp); | |
46900298 JB |
572 | |
573 | /* check if we need to merge IBSS */ | |
574 | ||
46900298 | 575 | /* we use a fixed BSSID */ |
a98bfec2 | 576 | if (sdata->u.ibss.fixed_bssid) |
46900298 JB |
577 | goto put_bss; |
578 | ||
579 | /* not an IBSS */ | |
0c1ad2ca | 580 | if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) |
46900298 JB |
581 | goto put_bss; |
582 | ||
583 | /* different channel */ | |
55de908a | 584 | if (sdata->u.ibss.fixed_channel && |
3aede78a | 585 | sdata->u.ibss.chandef.chan != cbss->channel) |
46900298 JB |
586 | goto put_bss; |
587 | ||
588 | /* different SSID */ | |
589 | if (elems->ssid_len != sdata->u.ibss.ssid_len || | |
590 | memcmp(elems->ssid, sdata->u.ibss.ssid, | |
591 | sdata->u.ibss.ssid_len)) | |
592 | goto put_bss; | |
593 | ||
34e8f082 | 594 | /* same BSSID */ |
b203ca39 | 595 | if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) |
34e8f082 AF |
596 | goto put_bss; |
597 | ||
f4bda337 TP |
598 | if (ieee80211_have_rx_timestamp(rx_status)) { |
599 | /* time when timestamp field was received */ | |
600 | rx_timestamp = | |
601 | ieee80211_calculate_rx_timestamp(local, rx_status, | |
602 | len + FCS_LEN, 24); | |
24487981 JB |
603 | } else { |
604 | /* | |
605 | * second best option: get current TSF | |
606 | * (will return -1 if not supported) | |
607 | */ | |
37a41b4a | 608 | rx_timestamp = drv_get_tsf(local, sdata); |
24487981 | 609 | } |
46900298 | 610 | |
bdcbd8e0 JB |
611 | ibss_dbg(sdata, |
612 | "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", | |
613 | mgmt->sa, mgmt->bssid, | |
614 | (unsigned long long)rx_timestamp, | |
615 | (unsigned long long)beacon_timestamp, | |
616 | (unsigned long long)(rx_timestamp - beacon_timestamp), | |
617 | jiffies); | |
46900298 JB |
618 | |
619 | if (beacon_timestamp > rx_timestamp) { | |
bdcbd8e0 JB |
620 | ibss_dbg(sdata, |
621 | "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", | |
622 | mgmt->bssid); | |
46900298 | 623 | ieee80211_sta_join_ibss(sdata, bss); |
2103dec1 | 624 | supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL); |
34e89507 | 625 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, |
52874a5e | 626 | supp_rates); |
8bf11d8d | 627 | rcu_read_unlock(); |
46900298 JB |
628 | } |
629 | ||
630 | put_bss: | |
631 | ieee80211_rx_bss_put(local, bss); | |
632 | } | |
633 | ||
8bf11d8d JB |
634 | void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, |
635 | const u8 *bssid, const u8 *addr, | |
636 | u32 supp_rates) | |
46900298 | 637 | { |
2e10d330 | 638 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
46900298 JB |
639 | struct ieee80211_local *local = sdata->local; |
640 | struct sta_info *sta; | |
55de908a | 641 | struct ieee80211_chanctx_conf *chanctx_conf; |
b422c6cd | 642 | struct ieee80211_supported_band *sband; |
55de908a | 643 | int band; |
46900298 | 644 | |
af8cdcd8 JB |
645 | /* |
646 | * XXX: Consider removing the least recently used entry and | |
647 | * allow new one to be added. | |
648 | */ | |
46900298 | 649 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { |
bdcbd8e0 | 650 | net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
e87cc472 | 651 | sdata->name, addr); |
8bf11d8d | 652 | return; |
46900298 JB |
653 | } |
654 | ||
2e10d330 | 655 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) |
8bf11d8d | 656 | return; |
2e10d330 | 657 | |
b203ca39 | 658 | if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) |
8bf11d8d | 659 | return; |
46900298 | 660 | |
55de908a JB |
661 | rcu_read_lock(); |
662 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
663 | if (WARN_ON_ONCE(!chanctx_conf)) { | |
664 | rcu_read_unlock(); | |
665 | return; | |
666 | } | |
4bf88530 | 667 | band = chanctx_conf->def.chan->band; |
55de908a JB |
668 | rcu_read_unlock(); |
669 | ||
8bf11d8d | 670 | sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); |
46900298 | 671 | if (!sta) |
8bf11d8d | 672 | return; |
46900298 | 673 | |
c8716d9d | 674 | sta->last_rx = jiffies; |
d9a7ddb0 | 675 | |
46900298 | 676 | /* make sure mandatory rates are always added */ |
b422c6cd | 677 | sband = local->hw.wiphy->bands[band]; |
46900298 | 678 | sta->sta.supp_rates[band] = supp_rates | |
b422c6cd | 679 | ieee80211_mandatory_rates(sband); |
46900298 | 680 | |
8bf11d8d JB |
681 | spin_lock(&ifibss->incomplete_lock); |
682 | list_add(&sta->list, &ifibss->incomplete_stations); | |
683 | spin_unlock(&ifibss->incomplete_lock); | |
684 | ieee80211_queue_work(&local->hw, &sdata->work); | |
46900298 JB |
685 | } |
686 | ||
687 | static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) | |
688 | { | |
689 | struct ieee80211_local *local = sdata->local; | |
690 | int active = 0; | |
691 | struct sta_info *sta; | |
692 | ||
8d61ffa5 | 693 | sdata_assert_lock(sdata); |
7a17a33c | 694 | |
46900298 JB |
695 | rcu_read_lock(); |
696 | ||
697 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
698 | if (sta->sdata == sdata && | |
699 | time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL, | |
700 | jiffies)) { | |
701 | active++; | |
702 | break; | |
703 | } | |
704 | } | |
705 | ||
706 | rcu_read_unlock(); | |
707 | ||
708 | return active; | |
709 | } | |
710 | ||
ce9058ae BP |
711 | /* |
712 | * This function is called with state == IEEE80211_IBSS_MLME_JOINED | |
713 | */ | |
46900298 JB |
714 | |
715 | static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) | |
716 | { | |
717 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
718 | ||
8d61ffa5 | 719 | sdata_assert_lock(sdata); |
7a17a33c | 720 | |
af8cdcd8 JB |
721 | mod_timer(&ifibss->timer, |
722 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 JB |
723 | |
724 | ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT); | |
af8cdcd8 | 725 | |
450aae3d S |
726 | if (time_before(jiffies, ifibss->last_scan_completed + |
727 | IEEE80211_IBSS_MERGE_INTERVAL)) | |
728 | return; | |
729 | ||
46900298 JB |
730 | if (ieee80211_sta_active_ibss(sdata)) |
731 | return; | |
732 | ||
c037b836 | 733 | if (ifibss->fixed_channel) |
46900298 JB |
734 | return; |
735 | ||
bdcbd8e0 JB |
736 | sdata_info(sdata, |
737 | "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); | |
46900298 | 738 | |
34bcf715 SG |
739 | ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len, |
740 | NULL); | |
46900298 JB |
741 | } |
742 | ||
af8cdcd8 | 743 | static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
744 | { |
745 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
46900298 | 746 | u8 bssid[ETH_ALEN]; |
46900298 JB |
747 | u16 capability; |
748 | int i; | |
749 | ||
8d61ffa5 | 750 | sdata_assert_lock(sdata); |
7a17a33c | 751 | |
af8cdcd8 | 752 | if (ifibss->fixed_bssid) { |
46900298 JB |
753 | memcpy(bssid, ifibss->bssid, ETH_ALEN); |
754 | } else { | |
755 | /* Generate random, not broadcast, locally administered BSSID. Mix in | |
756 | * own MAC address to make sure that devices that do not have proper | |
757 | * random number generator get different BSSID. */ | |
758 | get_random_bytes(bssid, ETH_ALEN); | |
759 | for (i = 0; i < ETH_ALEN; i++) | |
47846c9b | 760 | bssid[i] ^= sdata->vif.addr[i]; |
46900298 JB |
761 | bssid[0] &= ~0x01; |
762 | bssid[0] |= 0x02; | |
763 | } | |
764 | ||
bdcbd8e0 | 765 | sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); |
46900298 | 766 | |
46900298 JB |
767 | capability = WLAN_CAPABILITY_IBSS; |
768 | ||
fffd0934 | 769 | if (ifibss->privacy) |
46900298 JB |
770 | capability |= WLAN_CAPABILITY_PRIVACY; |
771 | else | |
772 | sdata->drop_unencrypted = 0; | |
773 | ||
57c4d7b4 | 774 | __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, |
3aede78a | 775 | ifibss->chandef.chan, ifibss->basic_rates, |
c13a765b | 776 | capability, 0, true); |
46900298 JB |
777 | } |
778 | ||
ce9058ae BP |
779 | /* |
780 | * This function is called with state == IEEE80211_IBSS_MLME_SEARCH | |
781 | */ | |
782 | ||
af8cdcd8 | 783 | static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
784 | { |
785 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
786 | struct ieee80211_local *local = sdata->local; | |
0c1ad2ca | 787 | struct cfg80211_bss *cbss; |
af8cdcd8 | 788 | struct ieee80211_channel *chan = NULL; |
46900298 JB |
789 | const u8 *bssid = NULL; |
790 | int active_ibss; | |
e0d61887 | 791 | u16 capability; |
46900298 | 792 | |
8d61ffa5 | 793 | sdata_assert_lock(sdata); |
7a17a33c | 794 | |
46900298 | 795 | active_ibss = ieee80211_sta_active_ibss(sdata); |
bdcbd8e0 | 796 | ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); |
46900298 JB |
797 | |
798 | if (active_ibss) | |
af8cdcd8 | 799 | return; |
46900298 | 800 | |
e0d61887 | 801 | capability = WLAN_CAPABILITY_IBSS; |
fffd0934 | 802 | if (ifibss->privacy) |
e0d61887 | 803 | capability |= WLAN_CAPABILITY_PRIVACY; |
af8cdcd8 JB |
804 | if (ifibss->fixed_bssid) |
805 | bssid = ifibss->bssid; | |
806 | if (ifibss->fixed_channel) | |
3aede78a | 807 | chan = ifibss->chandef.chan; |
af8cdcd8 | 808 | if (!is_zero_ether_addr(ifibss->bssid)) |
46900298 | 809 | bssid = ifibss->bssid; |
0c1ad2ca JB |
810 | cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, |
811 | ifibss->ssid, ifibss->ssid_len, | |
812 | WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY, | |
813 | capability); | |
814 | ||
815 | if (cbss) { | |
816 | struct ieee80211_bss *bss; | |
46900298 | 817 | |
0c1ad2ca | 818 | bss = (void *)cbss->priv; |
bdcbd8e0 JB |
819 | ibss_dbg(sdata, |
820 | "sta_find_ibss: selected %pM current %pM\n", | |
821 | cbss->bssid, ifibss->bssid); | |
822 | sdata_info(sdata, | |
823 | "Selected IBSS BSSID %pM based on configured SSID\n", | |
824 | cbss->bssid); | |
46900298 | 825 | |
af8cdcd8 | 826 | ieee80211_sta_join_ibss(sdata, bss); |
46900298 | 827 | ieee80211_rx_bss_put(local, bss); |
af8cdcd8 | 828 | return; |
d419b9f0 | 829 | } |
46900298 | 830 | |
bdcbd8e0 | 831 | ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); |
46900298 JB |
832 | |
833 | /* Selected IBSS not found in current scan results - try to scan */ | |
ce9058ae | 834 | if (time_after(jiffies, ifibss->last_scan_completed + |
46900298 | 835 | IEEE80211_SCAN_INTERVAL)) { |
bdcbd8e0 | 836 | sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); |
46900298 | 837 | |
34bcf715 SG |
838 | ieee80211_request_ibss_scan(sdata, ifibss->ssid, |
839 | ifibss->ssid_len, chan); | |
ce9058ae | 840 | } else { |
46900298 JB |
841 | int interval = IEEE80211_SCAN_INTERVAL; |
842 | ||
843 | if (time_after(jiffies, ifibss->ibss_join_req + | |
55de908a JB |
844 | IEEE80211_IBSS_JOIN_TIMEOUT)) |
845 | ieee80211_sta_create_ibss(sdata); | |
46900298 | 846 | |
af8cdcd8 JB |
847 | mod_timer(&ifibss->timer, |
848 | round_jiffies(jiffies + interval)); | |
46900298 | 849 | } |
46900298 JB |
850 | } |
851 | ||
852 | static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, | |
c269a203 | 853 | struct sk_buff *req) |
46900298 | 854 | { |
c269a203 | 855 | struct ieee80211_mgmt *mgmt = (void *)req->data; |
46900298 JB |
856 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
857 | struct ieee80211_local *local = sdata->local; | |
c269a203 | 858 | int tx_last_beacon, len = req->len; |
46900298 | 859 | struct sk_buff *skb; |
c3ffeab4 | 860 | struct beacon_data *presp; |
46900298 JB |
861 | u8 *pos, *end; |
862 | ||
8d61ffa5 | 863 | sdata_assert_lock(sdata); |
7a17a33c | 864 | |
40b275b6 | 865 | presp = rcu_dereference_protected(ifibss->presp, |
8d61ffa5 | 866 | lockdep_is_held(&sdata->wdev.mtx)); |
40b275b6 | 867 | |
46900298 | 868 | if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || |
40b275b6 | 869 | len < 24 + 2 || !presp) |
46900298 JB |
870 | return; |
871 | ||
24487981 | 872 | tx_last_beacon = drv_tx_last_beacon(local); |
46900298 | 873 | |
bdcbd8e0 JB |
874 | ibss_dbg(sdata, |
875 | "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n", | |
876 | mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon); | |
46900298 | 877 | |
1ed76487 | 878 | if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) |
46900298 JB |
879 | return; |
880 | ||
b203ca39 | 881 | if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && |
888d04df | 882 | !is_broadcast_ether_addr(mgmt->bssid)) |
46900298 JB |
883 | return; |
884 | ||
885 | end = ((u8 *) mgmt) + len; | |
886 | pos = mgmt->u.probe_req.variable; | |
887 | if (pos[0] != WLAN_EID_SSID || | |
888 | pos + 2 + pos[1] > end) { | |
bdcbd8e0 JB |
889 | ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", |
890 | mgmt->sa); | |
46900298 JB |
891 | return; |
892 | } | |
893 | if (pos[1] != 0 && | |
894 | (pos[1] != ifibss->ssid_len || | |
0da780c2 | 895 | memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { |
46900298 JB |
896 | /* Ignore ProbeReq for foreign SSID */ |
897 | return; | |
898 | } | |
899 | ||
900 | /* Reply with ProbeResp */ | |
c3ffeab4 | 901 | skb = dev_alloc_skb(local->tx_headroom + presp->head_len); |
46900298 JB |
902 | if (!skb) |
903 | return; | |
904 | ||
c3ffeab4 JB |
905 | skb_reserve(skb, local->tx_headroom); |
906 | memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len); | |
907 | ||
908 | memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN); | |
909 | ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa); | |
62ae67be JB |
910 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
911 | ieee80211_tx_skb(sdata, skb); | |
46900298 JB |
912 | } |
913 | ||
d45c4172 EG |
914 | static |
915 | void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata, | |
916 | struct ieee80211_mgmt *mgmt, size_t len, | |
917 | struct ieee80211_rx_status *rx_status) | |
46900298 JB |
918 | { |
919 | size_t baselen; | |
920 | struct ieee802_11_elems elems; | |
921 | ||
d45c4172 EG |
922 | BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) != |
923 | offsetof(typeof(mgmt->u.beacon), variable)); | |
924 | ||
925 | /* | |
926 | * either beacon or probe_resp but the variable field is at the | |
927 | * same offset | |
928 | */ | |
46900298 JB |
929 | baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; |
930 | if (baselen > len) | |
931 | return; | |
932 | ||
933 | ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, | |
b2e506bf | 934 | false, &elems); |
46900298 | 935 | |
d45c4172 | 936 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); |
46900298 JB |
937 | } |
938 | ||
1fa57d01 JB |
939 | void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, |
940 | struct sk_buff *skb) | |
46900298 JB |
941 | { |
942 | struct ieee80211_rx_status *rx_status; | |
943 | struct ieee80211_mgmt *mgmt; | |
944 | u16 fc; | |
945 | ||
f1d58c25 | 946 | rx_status = IEEE80211_SKB_RXCB(skb); |
46900298 JB |
947 | mgmt = (struct ieee80211_mgmt *) skb->data; |
948 | fc = le16_to_cpu(mgmt->frame_control); | |
949 | ||
8d61ffa5 | 950 | sdata_lock(sdata); |
7a17a33c | 951 | |
c926d006 TH |
952 | if (!sdata->u.ibss.ssid_len) |
953 | goto mgmt_out; /* not ready to merge yet */ | |
954 | ||
46900298 JB |
955 | switch (fc & IEEE80211_FCTL_STYPE) { |
956 | case IEEE80211_STYPE_PROBE_REQ: | |
c269a203 | 957 | ieee80211_rx_mgmt_probe_req(sdata, skb); |
46900298 JB |
958 | break; |
959 | case IEEE80211_STYPE_PROBE_RESP: | |
46900298 | 960 | case IEEE80211_STYPE_BEACON: |
d45c4172 EG |
961 | ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len, |
962 | rx_status); | |
46900298 JB |
963 | break; |
964 | case IEEE80211_STYPE_AUTH: | |
965 | ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); | |
966 | break; | |
2cc59e78 AQ |
967 | case IEEE80211_STYPE_DEAUTH: |
968 | ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); | |
969 | break; | |
46900298 | 970 | } |
7a17a33c | 971 | |
c926d006 | 972 | mgmt_out: |
8d61ffa5 | 973 | sdata_unlock(sdata); |
46900298 JB |
974 | } |
975 | ||
1fa57d01 | 976 | void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) |
46900298 | 977 | { |
1fa57d01 | 978 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
8bf11d8d | 979 | struct sta_info *sta; |
46900298 | 980 | |
8d61ffa5 | 981 | sdata_lock(sdata); |
7a17a33c JB |
982 | |
983 | /* | |
984 | * Work could be scheduled after scan or similar | |
985 | * when we aren't even joined (or trying) with a | |
986 | * network. | |
987 | */ | |
988 | if (!ifibss->ssid_len) | |
989 | goto out; | |
46900298 | 990 | |
8bf11d8d JB |
991 | spin_lock_bh(&ifibss->incomplete_lock); |
992 | while (!list_empty(&ifibss->incomplete_stations)) { | |
993 | sta = list_first_entry(&ifibss->incomplete_stations, | |
994 | struct sta_info, list); | |
995 | list_del(&sta->list); | |
996 | spin_unlock_bh(&ifibss->incomplete_lock); | |
997 | ||
52874a5e | 998 | ieee80211_ibss_finish_sta(sta); |
8bf11d8d JB |
999 | rcu_read_unlock(); |
1000 | spin_lock_bh(&ifibss->incomplete_lock); | |
1001 | } | |
1002 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1003 | ||
46900298 JB |
1004 | switch (ifibss->state) { |
1005 | case IEEE80211_IBSS_MLME_SEARCH: | |
1006 | ieee80211_sta_find_ibss(sdata); | |
1007 | break; | |
1008 | case IEEE80211_IBSS_MLME_JOINED: | |
1009 | ieee80211_sta_merge_ibss(sdata); | |
1010 | break; | |
1011 | default: | |
1012 | WARN_ON(1); | |
1013 | break; | |
1014 | } | |
46900298 | 1015 | |
7a17a33c | 1016 | out: |
8d61ffa5 | 1017 | sdata_unlock(sdata); |
3a4d4aa2 JB |
1018 | } |
1019 | ||
46900298 JB |
1020 | static void ieee80211_ibss_timer(unsigned long data) |
1021 | { | |
1022 | struct ieee80211_sub_if_data *sdata = | |
1023 | (struct ieee80211_sub_if_data *) data; | |
5bb644a0 | 1024 | |
a6182943 | 1025 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
5bb644a0 | 1026 | } |
5bb644a0 | 1027 | |
46900298 JB |
1028 | void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) |
1029 | { | |
1030 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1031 | ||
46900298 JB |
1032 | setup_timer(&ifibss->timer, ieee80211_ibss_timer, |
1033 | (unsigned long) sdata); | |
8bf11d8d JB |
1034 | INIT_LIST_HEAD(&ifibss->incomplete_stations); |
1035 | spin_lock_init(&ifibss->incomplete_lock); | |
46900298 JB |
1036 | } |
1037 | ||
1038 | /* scan finished notification */ | |
1039 | void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) | |
1040 | { | |
af8cdcd8 | 1041 | struct ieee80211_sub_if_data *sdata; |
46900298 | 1042 | |
29b4a4f7 JB |
1043 | mutex_lock(&local->iflist_mtx); |
1044 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 1045 | if (!ieee80211_sdata_running(sdata)) |
0e41f715 | 1046 | continue; |
af8cdcd8 JB |
1047 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
1048 | continue; | |
1049 | sdata->u.ibss.last_scan_completed = jiffies; | |
7a17a33c | 1050 | ieee80211_queue_work(&local->hw, &sdata->work); |
46900298 | 1051 | } |
29b4a4f7 | 1052 | mutex_unlock(&local->iflist_mtx); |
46900298 JB |
1053 | } |
1054 | ||
af8cdcd8 JB |
1055 | int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, |
1056 | struct cfg80211_ibss_params *params) | |
1057 | { | |
ff3cc5f4 | 1058 | u32 changed = 0; |
2103dec1 SW |
1059 | u32 rate_flags; |
1060 | struct ieee80211_supported_band *sband; | |
1061 | int i; | |
af8cdcd8 | 1062 | |
af8cdcd8 JB |
1063 | if (params->bssid) { |
1064 | memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); | |
1065 | sdata->u.ibss.fixed_bssid = true; | |
1066 | } else | |
1067 | sdata->u.ibss.fixed_bssid = false; | |
1068 | ||
fffd0934 | 1069 | sdata->u.ibss.privacy = params->privacy; |
267335d6 | 1070 | sdata->u.ibss.control_port = params->control_port; |
fbd2c8dc | 1071 | sdata->u.ibss.basic_rates = params->basic_rates; |
2103dec1 SW |
1072 | |
1073 | /* fix basic_rates if channel does not support these rates */ | |
1074 | rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef); | |
1075 | sband = sdata->local->hw.wiphy->bands[params->chandef.chan->band]; | |
1076 | for (i = 0; i < sband->n_bitrates; i++) { | |
1077 | if ((rate_flags & sband->bitrates[i].flags) != rate_flags) | |
1078 | sdata->u.ibss.basic_rates &= ~BIT(i); | |
1079 | } | |
dd5b4cc7 FF |
1080 | memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, |
1081 | sizeof(params->mcast_rate)); | |
fffd0934 | 1082 | |
57c4d7b4 JB |
1083 | sdata->vif.bss_conf.beacon_int = params->beacon_interval; |
1084 | ||
3aede78a | 1085 | sdata->u.ibss.chandef = params->chandef; |
af8cdcd8 JB |
1086 | sdata->u.ibss.fixed_channel = params->channel_fixed; |
1087 | ||
1088 | if (params->ie) { | |
1089 | sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, | |
1090 | GFP_KERNEL); | |
1091 | if (sdata->u.ibss.ie) | |
1092 | sdata->u.ibss.ie_len = params->ie_len; | |
1093 | } | |
1094 | ||
af8cdcd8 JB |
1095 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; |
1096 | sdata->u.ibss.ibss_join_req = jiffies; | |
1097 | ||
badecb00 | 1098 | memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); |
0e41f715 JB |
1099 | sdata->u.ibss.ssid_len = params->ssid_len; |
1100 | ||
822854b0 SW |
1101 | memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa, |
1102 | sizeof(sdata->u.ibss.ht_capa)); | |
1103 | memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask, | |
1104 | sizeof(sdata->u.ibss.ht_capa_mask)); | |
1105 | ||
ff3cc5f4 SW |
1106 | /* |
1107 | * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is | |
1108 | * reserved, but an HT STA shall protect HT transmissions as though | |
1109 | * the HT Protection field were set to non-HT mixed mode. | |
1110 | * | |
1111 | * In an IBSS, the RIFS Mode field of the HT Operation element is | |
1112 | * also reserved, but an HT STA shall operate as though this field | |
1113 | * were set to 1. | |
1114 | */ | |
1115 | ||
1116 | sdata->vif.bss_conf.ht_operation_mode |= | |
1117 | IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | |
1118 | | IEEE80211_HT_PARAM_RIFS_MODE; | |
1119 | ||
1120 | changed |= BSS_CHANGED_HT; | |
1121 | ieee80211_bss_info_change_notify(sdata, changed); | |
1122 | ||
04ecd257 JB |
1123 | sdata->smps_mode = IEEE80211_SMPS_OFF; |
1124 | sdata->needed_rx_chains = sdata->local->rx_chains; | |
1125 | ||
64592c8f | 1126 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
af8cdcd8 JB |
1127 | |
1128 | return 0; | |
1129 | } | |
1130 | ||
1131 | int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) | |
1132 | { | |
5ea096c0 TP |
1133 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
1134 | struct ieee80211_local *local = sdata->local; | |
1135 | struct cfg80211_bss *cbss; | |
1136 | u16 capability; | |
7a17a33c | 1137 | int active_ibss; |
8bf11d8d | 1138 | struct sta_info *sta; |
c3ffeab4 | 1139 | struct beacon_data *presp; |
7a17a33c | 1140 | |
5ea096c0 TP |
1141 | active_ibss = ieee80211_sta_active_ibss(sdata); |
1142 | ||
1143 | if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) { | |
1144 | capability = WLAN_CAPABILITY_IBSS; | |
1145 | ||
1146 | if (ifibss->privacy) | |
1147 | capability |= WLAN_CAPABILITY_PRIVACY; | |
1148 | ||
3aede78a | 1149 | cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan, |
5ea096c0 TP |
1150 | ifibss->bssid, ifibss->ssid, |
1151 | ifibss->ssid_len, WLAN_CAPABILITY_IBSS | | |
1152 | WLAN_CAPABILITY_PRIVACY, | |
1153 | capability); | |
1154 | ||
1155 | if (cbss) { | |
1156 | cfg80211_unlink_bss(local->hw.wiphy, cbss); | |
5b112d3d | 1157 | cfg80211_put_bss(local->hw.wiphy, cbss); |
5ea096c0 TP |
1158 | } |
1159 | } | |
af8cdcd8 | 1160 | |
b78a4932 SW |
1161 | ifibss->state = IEEE80211_IBSS_MLME_SEARCH; |
1162 | memset(ifibss->bssid, 0, ETH_ALEN); | |
1163 | ifibss->ssid_len = 0; | |
1164 | ||
b998e8bb | 1165 | sta_info_flush(sdata); |
8bf11d8d JB |
1166 | |
1167 | spin_lock_bh(&ifibss->incomplete_lock); | |
1168 | while (!list_empty(&ifibss->incomplete_stations)) { | |
1169 | sta = list_first_entry(&ifibss->incomplete_stations, | |
1170 | struct sta_info, list); | |
1171 | list_del(&sta->list); | |
1172 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1173 | ||
1174 | sta_info_free(local, sta); | |
1175 | spin_lock_bh(&ifibss->incomplete_lock); | |
1176 | } | |
1177 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1178 | ||
86a2ea41 | 1179 | netif_carrier_off(sdata->dev); |
af8cdcd8 JB |
1180 | |
1181 | /* remove beacon */ | |
1182 | kfree(sdata->u.ibss.ie); | |
c3ffeab4 | 1183 | presp = rcu_dereference_protected(ifibss->presp, |
8d61ffa5 | 1184 | lockdep_is_held(&sdata->wdev.mtx)); |
a9b3cd7f | 1185 | RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); |
822854b0 SW |
1186 | |
1187 | /* on the next join, re-program HT parameters */ | |
1188 | memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa)); | |
1189 | memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask)); | |
1190 | ||
8fc214ba | 1191 | sdata->vif.bss_conf.ibss_joined = false; |
c13a765b | 1192 | sdata->vif.bss_conf.ibss_creator = false; |
d6a83228 | 1193 | sdata->vif.bss_conf.enable_beacon = false; |
0ca54f6c | 1194 | sdata->vif.bss_conf.ssid_len = 0; |
d6a83228 | 1195 | clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); |
8fc214ba JB |
1196 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | |
1197 | BSS_CHANGED_IBSS); | |
af8cdcd8 | 1198 | synchronize_rcu(); |
c3ffeab4 | 1199 | kfree(presp); |
af8cdcd8 | 1200 | |
35f20c14 | 1201 | skb_queue_purge(&sdata->skb_queue); |
5cff20e6 | 1202 | |
bc05d19f | 1203 | del_timer_sync(&sdata->u.ibss.timer); |
7a17a33c | 1204 | |
af8cdcd8 JB |
1205 | return 0; |
1206 | } |