Commit | Line | Data |
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46900298 JB |
1 | /* |
2 | * IBSS mode implementation | |
3 | * Copyright 2003-2008, Jouni Malinen <j@w1.fi> | |
4 | * Copyright 2004, Instant802 Networks, Inc. | |
5 | * Copyright 2005, Devicescape Software, Inc. | |
6 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
7 | * Copyright 2007, Michael Wu <flamingice@sourmilk.net> | |
8 | * Copyright 2009, Johannes Berg <johannes@sipsolutions.net> | |
d98ad83e | 9 | * Copyright 2013-2014 Intel Mobile Communications GmbH |
46900298 JB |
10 | * |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License version 2 as | |
13 | * published by the Free Software Foundation. | |
14 | */ | |
15 | ||
16 | #include <linux/delay.h> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
46900298 JB |
18 | #include <linux/if_ether.h> |
19 | #include <linux/skbuff.h> | |
20 | #include <linux/if_arp.h> | |
21 | #include <linux/etherdevice.h> | |
22 | #include <linux/rtnetlink.h> | |
23 | #include <net/mac80211.h> | |
46900298 JB |
24 | |
25 | #include "ieee80211_i.h" | |
24487981 | 26 | #include "driver-ops.h" |
46900298 JB |
27 | #include "rate.h" |
28 | ||
29 | #define IEEE80211_SCAN_INTERVAL (2 * HZ) | |
46900298 JB |
30 | #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ) |
31 | ||
32 | #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ) | |
33 | #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ) | |
dad9defd | 34 | #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ) |
46900298 JB |
35 | |
36 | #define IEEE80211_IBSS_MAX_STA_ENTRIES 128 | |
37 | ||
d51b70ff SW |
38 | static struct beacon_data * |
39 | ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata, | |
40 | const int beacon_int, const u32 basic_rates, | |
41 | const u16 capability, u64 tsf, | |
42 | struct cfg80211_chan_def *chandef, | |
cd7760e6 SW |
43 | bool *have_higher_than_11mbit, |
44 | struct cfg80211_csa_settings *csa_settings) | |
46900298 JB |
45 | { |
46 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
47 | struct ieee80211_local *local = sdata->local; | |
2103dec1 | 48 | int rates_n = 0, i, ri; |
46900298 JB |
49 | struct ieee80211_mgmt *mgmt; |
50 | u8 *pos; | |
51 | struct ieee80211_supported_band *sband; | |
d51b70ff | 52 | u32 rate_flags, rates = 0, rates_added = 0; |
c3ffeab4 JB |
53 | struct beacon_data *presp; |
54 | int frame_len; | |
2103dec1 | 55 | int shift; |
24487981 | 56 | |
46900298 | 57 | /* Build IBSS probe response */ |
c3ffeab4 JB |
58 | frame_len = sizeof(struct ieee80211_hdr_3addr) + |
59 | 12 /* struct ieee80211_mgmt.u.beacon */ + | |
60 | 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ + | |
61 | 2 + 8 /* max Supported Rates */ + | |
62 | 3 /* max DS params */ + | |
63 | 4 /* IBSS params */ + | |
cd7760e6 | 64 | 5 /* Channel Switch Announcement */ + |
c3ffeab4 JB |
65 | 2 + (IEEE80211_MAX_SUPP_RATES - 8) + |
66 | 2 + sizeof(struct ieee80211_ht_cap) + | |
67 | 2 + sizeof(struct ieee80211_ht_operation) + | |
68 | ifibss->ie_len; | |
69 | presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL); | |
70 | if (!presp) | |
d51b70ff | 71 | return NULL; |
c3ffeab4 JB |
72 | |
73 | presp->head = (void *)(presp + 1); | |
74 | ||
75 | mgmt = (void *) presp->head; | |
46900298 JB |
76 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
77 | IEEE80211_STYPE_PROBE_RESP); | |
e83e6541 | 78 | eth_broadcast_addr(mgmt->da); |
47846c9b | 79 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
46900298 | 80 | memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN); |
57c4d7b4 | 81 | mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int); |
707c1b4e | 82 | mgmt->u.beacon.timestamp = cpu_to_le64(tsf); |
46900298 JB |
83 | mgmt->u.beacon.capab_info = cpu_to_le16(capability); |
84 | ||
c3ffeab4 JB |
85 | pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable); |
86 | ||
46900298 JB |
87 | *pos++ = WLAN_EID_SSID; |
88 | *pos++ = ifibss->ssid_len; | |
89 | memcpy(pos, ifibss->ssid, ifibss->ssid_len); | |
c3ffeab4 | 90 | pos += ifibss->ssid_len; |
46900298 | 91 | |
d51b70ff SW |
92 | sband = local->hw.wiphy->bands[chandef->chan->band]; |
93 | rate_flags = ieee80211_chandef_rate_flags(chandef); | |
94 | shift = ieee80211_chandef_get_shift(chandef); | |
95 | rates_n = 0; | |
96 | if (have_higher_than_11mbit) | |
97 | *have_higher_than_11mbit = false; | |
98 | ||
2103dec1 SW |
99 | for (i = 0; i < sband->n_bitrates; i++) { |
100 | if ((rate_flags & sband->bitrates[i].flags) != rate_flags) | |
101 | continue; | |
d51b70ff SW |
102 | if (sband->bitrates[i].bitrate > 110 && |
103 | have_higher_than_11mbit) | |
104 | *have_higher_than_11mbit = true; | |
2103dec1 SW |
105 | |
106 | rates |= BIT(i); | |
107 | rates_n++; | |
108 | } | |
109 | ||
46900298 | 110 | *pos++ = WLAN_EID_SUPP_RATES; |
2103dec1 SW |
111 | *pos++ = min_t(int, 8, rates_n); |
112 | for (ri = 0; ri < sband->n_bitrates; ri++) { | |
113 | int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, | |
114 | 5 * (1 << shift)); | |
c3ffeab4 | 115 | u8 basic = 0; |
2103dec1 SW |
116 | if (!(rates & BIT(ri))) |
117 | continue; | |
118 | ||
119 | if (basic_rates & BIT(ri)) | |
c3ffeab4 | 120 | basic = 0x80; |
2103dec1 | 121 | *pos++ = basic | (u8) rate; |
93c75786 SW |
122 | if (++rates_added == 8) { |
123 | ri++; /* continue at next rate for EXT_SUPP_RATES */ | |
2103dec1 | 124 | break; |
93c75786 | 125 | } |
c3ffeab4 | 126 | } |
46900298 JB |
127 | |
128 | if (sband->band == IEEE80211_BAND_2GHZ) { | |
46900298 JB |
129 | *pos++ = WLAN_EID_DS_PARAMS; |
130 | *pos++ = 1; | |
d51b70ff SW |
131 | *pos++ = ieee80211_frequency_to_channel( |
132 | chandef->chan->center_freq); | |
46900298 JB |
133 | } |
134 | ||
46900298 JB |
135 | *pos++ = WLAN_EID_IBSS_PARAMS; |
136 | *pos++ = 2; | |
137 | /* FIX: set ATIM window based on scan results */ | |
138 | *pos++ = 0; | |
139 | *pos++ = 0; | |
140 | ||
cd7760e6 SW |
141 | if (csa_settings) { |
142 | *pos++ = WLAN_EID_CHANNEL_SWITCH; | |
143 | *pos++ = 3; | |
144 | *pos++ = csa_settings->block_tx ? 1 : 0; | |
145 | *pos++ = ieee80211_frequency_to_channel( | |
146 | csa_settings->chandef.chan->center_freq); | |
af296bdb | 147 | presp->csa_counter_offsets[0] = (pos - presp->head); |
cd7760e6 SW |
148 | *pos++ = csa_settings->count; |
149 | } | |
150 | ||
2103dec1 SW |
151 | /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */ |
152 | if (rates_n > 8) { | |
46900298 | 153 | *pos++ = WLAN_EID_EXT_SUPP_RATES; |
2103dec1 SW |
154 | *pos++ = rates_n - 8; |
155 | for (; ri < sband->n_bitrates; ri++) { | |
156 | int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, | |
157 | 5 * (1 << shift)); | |
c3ffeab4 | 158 | u8 basic = 0; |
2103dec1 SW |
159 | if (!(rates & BIT(ri))) |
160 | continue; | |
161 | ||
162 | if (basic_rates & BIT(ri)) | |
c3ffeab4 | 163 | basic = 0x80; |
2103dec1 | 164 | *pos++ = basic | (u8) rate; |
c3ffeab4 | 165 | } |
46900298 JB |
166 | } |
167 | ||
c3ffeab4 JB |
168 | if (ifibss->ie_len) { |
169 | memcpy(pos, ifibss->ie, ifibss->ie_len); | |
170 | pos += ifibss->ie_len; | |
171 | } | |
af8cdcd8 | 172 | |
13c40c54 | 173 | /* add HT capability and information IEs */ |
d51b70ff SW |
174 | if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT && |
175 | chandef->width != NL80211_CHAN_WIDTH_5 && | |
176 | chandef->width != NL80211_CHAN_WIDTH_10 && | |
683b6d3b | 177 | sband->ht_cap.ht_supported) { |
822854b0 SW |
178 | struct ieee80211_sta_ht_cap ht_cap; |
179 | ||
180 | memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); | |
181 | ieee80211_apply_htcap_overrides(sdata, &ht_cap); | |
182 | ||
183 | pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, 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, |
d51b70ff | 190 | chandef, 0); |
13c40c54 AS |
191 | } |
192 | ||
40b861a0 AN |
193 | if (local->hw.queues >= IEEE80211_NUM_ACS) |
194 | pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */ | |
9eba6125 | 195 | |
c3ffeab4 JB |
196 | presp->head_len = pos - presp->head; |
197 | if (WARN_ON(presp->head_len > frame_len)) | |
d51b70ff SW |
198 | goto error; |
199 | ||
200 | return presp; | |
201 | error: | |
202 | kfree(presp); | |
203 | return NULL; | |
204 | } | |
205 | ||
206 | static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, | |
207 | const u8 *bssid, const int beacon_int, | |
b35c8097 | 208 | struct cfg80211_chan_def *req_chandef, |
d51b70ff SW |
209 | const u32 basic_rates, |
210 | const u16 capability, u64 tsf, | |
211 | bool creator) | |
212 | { | |
213 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
214 | struct ieee80211_local *local = sdata->local; | |
d51b70ff SW |
215 | struct ieee80211_mgmt *mgmt; |
216 | struct cfg80211_bss *bss; | |
217 | u32 bss_change; | |
218 | struct cfg80211_chan_def chandef; | |
b35c8097 | 219 | struct ieee80211_channel *chan; |
d51b70ff SW |
220 | struct beacon_data *presp; |
221 | enum nl80211_bss_scan_width scan_width; | |
222 | bool have_higher_than_11mbit; | |
2beb6dab | 223 | bool radar_required; |
55fff501 | 224 | int err; |
d51b70ff SW |
225 | |
226 | sdata_assert_lock(sdata); | |
227 | ||
228 | /* Reset own TSF to allow time synchronization work. */ | |
229 | drv_reset_tsf(local, sdata); | |
230 | ||
231 | if (!ether_addr_equal(ifibss->bssid, bssid)) | |
232 | sta_info_flush(sdata); | |
233 | ||
234 | /* if merging, indicate to driver that we leave the old IBSS */ | |
235 | if (sdata->vif.bss_conf.ibss_joined) { | |
236 | sdata->vif.bss_conf.ibss_joined = false; | |
237 | sdata->vif.bss_conf.ibss_creator = false; | |
238 | sdata->vif.bss_conf.enable_beacon = false; | |
239 | netif_carrier_off(sdata->dev); | |
240 | ieee80211_bss_info_change_notify(sdata, | |
241 | BSS_CHANGED_IBSS | | |
242 | BSS_CHANGED_BEACON_ENABLED); | |
55fff501 | 243 | drv_leave_ibss(local, sdata); |
d51b70ff SW |
244 | } |
245 | ||
246 | presp = rcu_dereference_protected(ifibss->presp, | |
247 | lockdep_is_held(&sdata->wdev.mtx)); | |
0c2bef46 | 248 | RCU_INIT_POINTER(ifibss->presp, NULL); |
d51b70ff SW |
249 | if (presp) |
250 | kfree_rcu(presp, rcu_head); | |
251 | ||
252 | sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0; | |
253 | ||
b35c8097 JL |
254 | /* make a copy of the chandef, it could be modified below. */ |
255 | chandef = *req_chandef; | |
256 | chan = chandef.chan; | |
174e0cd2 IP |
257 | if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef, |
258 | NL80211_IFTYPE_ADHOC)) { | |
d51b70ff SW |
259 | if (chandef.width == NL80211_CHAN_WIDTH_5 || |
260 | chandef.width == NL80211_CHAN_WIDTH_10 || | |
261 | chandef.width == NL80211_CHAN_WIDTH_20_NOHT || | |
262 | chandef.width == NL80211_CHAN_WIDTH_20) { | |
263 | sdata_info(sdata, | |
264 | "Failed to join IBSS, beacons forbidden\n"); | |
265 | return; | |
266 | } | |
267 | chandef.width = NL80211_CHAN_WIDTH_20; | |
268 | chandef.center_freq1 = chan->center_freq; | |
8e8d347d | 269 | /* check again for downgraded chandef */ |
174e0cd2 IP |
270 | if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef, |
271 | NL80211_IFTYPE_ADHOC)) { | |
8e8d347d SW |
272 | sdata_info(sdata, |
273 | "Failed to join IBSS, beacons forbidden\n"); | |
274 | return; | |
275 | } | |
276 | } | |
277 | ||
278 | err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, | |
2beb6dab | 279 | &chandef, NL80211_IFTYPE_ADHOC); |
6658ab80 LC |
280 | if (err < 0) { |
281 | sdata_info(sdata, | |
282 | "Failed to join IBSS, invalid chandef\n"); | |
283 | return; | |
284 | } | |
2beb6dab LC |
285 | if (err > 0 && !ifibss->userspace_handles_dfs) { |
286 | sdata_info(sdata, | |
287 | "Failed to join IBSS, DFS channel without control program\n"); | |
288 | return; | |
d51b70ff SW |
289 | } |
290 | ||
2beb6dab LC |
291 | radar_required = err; |
292 | ||
34a3740d | 293 | mutex_lock(&local->mtx); |
d51b70ff SW |
294 | if (ieee80211_vif_use_channel(sdata, &chandef, |
295 | ifibss->fixed_channel ? | |
296 | IEEE80211_CHANCTX_SHARED : | |
297 | IEEE80211_CHANCTX_EXCLUSIVE)) { | |
298 | sdata_info(sdata, "Failed to join IBSS, no channel context\n"); | |
34a3740d | 299 | mutex_unlock(&local->mtx); |
d51b70ff SW |
300 | return; |
301 | } | |
cc901de1 | 302 | sdata->radar_required = radar_required; |
34a3740d | 303 | mutex_unlock(&local->mtx); |
d51b70ff SW |
304 | |
305 | memcpy(ifibss->bssid, bssid, ETH_ALEN); | |
306 | ||
d51b70ff SW |
307 | presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates, |
308 | capability, tsf, &chandef, | |
cd7760e6 | 309 | &have_higher_than_11mbit, NULL); |
d51b70ff | 310 | if (!presp) |
c3ffeab4 JB |
311 | return; |
312 | ||
313 | rcu_assign_pointer(ifibss->presp, presp); | |
d51b70ff | 314 | mgmt = (void *)presp->head; |
46900298 | 315 | |
d6a83228 | 316 | sdata->vif.bss_conf.enable_beacon = true; |
2d0ddec5 | 317 | sdata->vif.bss_conf.beacon_int = beacon_int; |
fbd2c8dc | 318 | sdata->vif.bss_conf.basic_rates = basic_rates; |
0ca54f6c MP |
319 | sdata->vif.bss_conf.ssid_len = ifibss->ssid_len; |
320 | memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len); | |
2d0ddec5 JB |
321 | bss_change = BSS_CHANGED_BEACON_INT; |
322 | bss_change |= ieee80211_reset_erp_info(sdata); | |
323 | bss_change |= BSS_CHANGED_BSSID; | |
324 | bss_change |= BSS_CHANGED_BEACON; | |
325 | bss_change |= BSS_CHANGED_BEACON_ENABLED; | |
392cfdb1 | 326 | bss_change |= BSS_CHANGED_BASIC_RATES; |
13c40c54 | 327 | bss_change |= BSS_CHANGED_HT; |
8fc214ba | 328 | bss_change |= BSS_CHANGED_IBSS; |
0ca54f6c | 329 | bss_change |= BSS_CHANGED_SSID; |
2f91a967 SW |
330 | |
331 | /* | |
332 | * In 5 GHz/802.11a, we can always use short slot time. | |
333 | * (IEEE 802.11-2012 18.3.8.7) | |
334 | * | |
335 | * In 2.4GHz, we must always use long slots in IBSS for compatibility | |
336 | * reasons. | |
337 | * (IEEE 802.11-2012 19.4.5) | |
338 | * | |
339 | * HT follows these specifications (IEEE 802.11-2012 20.3.18) | |
340 | */ | |
341 | sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ; | |
342 | bss_change |= BSS_CHANGED_ERP_SLOT; | |
343 | ||
2ec9c1f6 SW |
344 | /* cf. IEEE 802.11 9.2.12 */ |
345 | if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit) | |
346 | sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; | |
347 | else | |
348 | sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; | |
349 | ||
55fff501 JB |
350 | ieee80211_set_wmm_default(sdata, true); |
351 | ||
8fc214ba | 352 | sdata->vif.bss_conf.ibss_joined = true; |
c13a765b | 353 | sdata->vif.bss_conf.ibss_creator = creator; |
46900298 | 354 | |
55fff501 JB |
355 | err = drv_join_ibss(local, sdata); |
356 | if (err) { | |
357 | sdata->vif.bss_conf.ibss_joined = false; | |
358 | sdata->vif.bss_conf.ibss_creator = false; | |
359 | sdata->vif.bss_conf.enable_beacon = false; | |
360 | sdata->vif.bss_conf.ssid_len = 0; | |
361 | RCU_INIT_POINTER(ifibss->presp, NULL); | |
362 | kfree_rcu(presp, rcu_head); | |
34a3740d | 363 | mutex_lock(&local->mtx); |
55fff501 | 364 | ieee80211_vif_release_channel(sdata); |
34a3740d | 365 | mutex_unlock(&local->mtx); |
55fff501 JB |
366 | sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n", |
367 | err); | |
368 | return; | |
369 | } | |
370 | ||
371 | ieee80211_bss_info_change_notify(sdata, bss_change); | |
46900298 | 372 | |
46900298 | 373 | ifibss->state = IEEE80211_IBSS_MLME_JOINED; |
af8cdcd8 JB |
374 | mod_timer(&ifibss->timer, |
375 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 | 376 | |
7ca15a0a SW |
377 | scan_width = cfg80211_chandef_to_scan_width(&chandef); |
378 | bss = cfg80211_inform_bss_width_frame(local->hw.wiphy, chan, | |
379 | scan_width, mgmt, | |
380 | presp->head_len, 0, GFP_KERNEL); | |
5b112d3d | 381 | cfg80211_put_bss(local->hw.wiphy, bss); |
86a2ea41 | 382 | netif_carrier_on(sdata->dev); |
fe94f3a4 | 383 | cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL); |
46900298 JB |
384 | } |
385 | ||
af8cdcd8 JB |
386 | static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
387 | struct ieee80211_bss *bss) | |
46900298 | 388 | { |
0c1ad2ca JB |
389 | struct cfg80211_bss *cbss = |
390 | container_of((void *)bss, struct cfg80211_bss, priv); | |
b59066a2 | 391 | struct ieee80211_supported_band *sband; |
75a423f4 | 392 | struct cfg80211_chan_def chandef; |
b59066a2 JB |
393 | u32 basic_rates; |
394 | int i, j; | |
0c1ad2ca | 395 | u16 beacon_int = cbss->beacon_interval; |
8cef2c9d | 396 | const struct cfg80211_bss_ies *ies; |
75a423f4 | 397 | enum nl80211_channel_type chan_type; |
8cef2c9d | 398 | u64 tsf; |
2103dec1 SW |
399 | u32 rate_flags; |
400 | int shift; | |
57c4d7b4 | 401 | |
8d61ffa5 | 402 | sdata_assert_lock(sdata); |
7a17a33c | 403 | |
57c4d7b4 JB |
404 | if (beacon_int < 10) |
405 | beacon_int = 10; | |
406 | ||
75a423f4 SW |
407 | switch (sdata->u.ibss.chandef.width) { |
408 | case NL80211_CHAN_WIDTH_20_NOHT: | |
409 | case NL80211_CHAN_WIDTH_20: | |
410 | case NL80211_CHAN_WIDTH_40: | |
411 | chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef); | |
412 | cfg80211_chandef_create(&chandef, cbss->channel, chan_type); | |
413 | break; | |
414 | case NL80211_CHAN_WIDTH_5: | |
415 | case NL80211_CHAN_WIDTH_10: | |
416 | cfg80211_chandef_create(&chandef, cbss->channel, | |
417 | NL80211_CHAN_WIDTH_20_NOHT); | |
418 | chandef.width = sdata->u.ibss.chandef.width; | |
419 | break; | |
420 | default: | |
421 | /* fall back to 20 MHz for unsupported modes */ | |
422 | cfg80211_chandef_create(&chandef, cbss->channel, | |
423 | NL80211_CHAN_WIDTH_20_NOHT); | |
424 | break; | |
425 | } | |
426 | ||
0c1ad2ca | 427 | sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; |
2103dec1 SW |
428 | rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef); |
429 | shift = ieee80211_vif_get_shift(&sdata->vif); | |
b59066a2 JB |
430 | |
431 | basic_rates = 0; | |
432 | ||
433 | for (i = 0; i < bss->supp_rates_len; i++) { | |
2103dec1 | 434 | int rate = bss->supp_rates[i] & 0x7f; |
b59066a2 JB |
435 | bool is_basic = !!(bss->supp_rates[i] & 0x80); |
436 | ||
437 | for (j = 0; j < sband->n_bitrates; j++) { | |
2103dec1 SW |
438 | int brate; |
439 | if ((rate_flags & sband->bitrates[j].flags) | |
440 | != rate_flags) | |
441 | continue; | |
442 | ||
443 | brate = DIV_ROUND_UP(sband->bitrates[j].bitrate, | |
444 | 5 * (1 << shift)); | |
445 | if (brate == rate) { | |
b59066a2 JB |
446 | if (is_basic) |
447 | basic_rates |= BIT(j); | |
448 | break; | |
449 | } | |
450 | } | |
451 | } | |
452 | ||
8cef2c9d JB |
453 | rcu_read_lock(); |
454 | ies = rcu_dereference(cbss->ies); | |
455 | tsf = ies->tsf; | |
456 | rcu_read_unlock(); | |
457 | ||
0c1ad2ca | 458 | __ieee80211_sta_join_ibss(sdata, cbss->bssid, |
57c4d7b4 | 459 | beacon_int, |
75a423f4 | 460 | &chandef, |
b59066a2 | 461 | basic_rates, |
0c1ad2ca | 462 | cbss->capability, |
8cef2c9d | 463 | tsf, false); |
46900298 JB |
464 | } |
465 | ||
cd7760e6 SW |
466 | int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata, |
467 | struct cfg80211_csa_settings *csa_settings) | |
468 | { | |
469 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
470 | struct beacon_data *presp, *old_presp; | |
471 | struct cfg80211_bss *cbss; | |
472 | const struct cfg80211_bss_ies *ies; | |
473 | u16 capability; | |
474 | u64 tsf; | |
475 | int ret = 0; | |
476 | ||
477 | sdata_assert_lock(sdata); | |
478 | ||
479 | capability = WLAN_CAPABILITY_IBSS; | |
480 | ||
481 | if (ifibss->privacy) | |
482 | capability |= WLAN_CAPABILITY_PRIVACY; | |
483 | ||
484 | cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan, | |
485 | ifibss->bssid, ifibss->ssid, | |
486 | ifibss->ssid_len, WLAN_CAPABILITY_IBSS | | |
487 | WLAN_CAPABILITY_PRIVACY, | |
488 | capability); | |
489 | ||
490 | if (WARN_ON(!cbss)) { | |
491 | ret = -EINVAL; | |
492 | goto out; | |
493 | } | |
494 | ||
495 | rcu_read_lock(); | |
496 | ies = rcu_dereference(cbss->ies); | |
497 | tsf = ies->tsf; | |
498 | rcu_read_unlock(); | |
499 | cfg80211_put_bss(sdata->local->hw.wiphy, cbss); | |
500 | ||
501 | old_presp = rcu_dereference_protected(ifibss->presp, | |
502 | lockdep_is_held(&sdata->wdev.mtx)); | |
503 | ||
504 | presp = ieee80211_ibss_build_presp(sdata, | |
505 | sdata->vif.bss_conf.beacon_int, | |
506 | sdata->vif.bss_conf.basic_rates, | |
507 | capability, tsf, &ifibss->chandef, | |
508 | NULL, csa_settings); | |
509 | if (!presp) { | |
510 | ret = -ENOMEM; | |
511 | goto out; | |
512 | } | |
513 | ||
514 | rcu_assign_pointer(ifibss->presp, presp); | |
515 | if (old_presp) | |
516 | kfree_rcu(old_presp, rcu_head); | |
517 | ||
dddd586b | 518 | return BSS_CHANGED_BEACON; |
cd7760e6 SW |
519 | out: |
520 | return ret; | |
521 | } | |
522 | ||
523 | int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata) | |
524 | { | |
525 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
526 | struct cfg80211_bss *cbss; | |
faf046e7 | 527 | int err, changed = 0; |
cd7760e6 SW |
528 | u16 capability; |
529 | ||
bafdc614 SW |
530 | sdata_assert_lock(sdata); |
531 | ||
cd7760e6 SW |
532 | /* update cfg80211 bss information with the new channel */ |
533 | if (!is_zero_ether_addr(ifibss->bssid)) { | |
534 | capability = WLAN_CAPABILITY_IBSS; | |
535 | ||
536 | if (ifibss->privacy) | |
537 | capability |= WLAN_CAPABILITY_PRIVACY; | |
538 | ||
539 | cbss = cfg80211_get_bss(sdata->local->hw.wiphy, | |
540 | ifibss->chandef.chan, | |
541 | ifibss->bssid, ifibss->ssid, | |
542 | ifibss->ssid_len, WLAN_CAPABILITY_IBSS | | |
543 | WLAN_CAPABILITY_PRIVACY, | |
544 | capability); | |
545 | /* XXX: should not really modify cfg80211 data */ | |
546 | if (cbss) { | |
33787fc4 | 547 | cbss->channel = sdata->csa_chandef.chan; |
cd7760e6 SW |
548 | cfg80211_put_bss(sdata->local->hw.wiphy, cbss); |
549 | } | |
550 | } | |
551 | ||
33787fc4 | 552 | ifibss->chandef = sdata->csa_chandef; |
cd7760e6 SW |
553 | |
554 | /* generate the beacon */ | |
555 | err = ieee80211_ibss_csa_beacon(sdata, NULL); | |
cd7760e6 SW |
556 | if (err < 0) |
557 | return err; | |
558 | ||
faf046e7 | 559 | changed |= err; |
dddd586b | 560 | |
faf046e7 | 561 | return changed; |
cd7760e6 SW |
562 | } |
563 | ||
564 | void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata) | |
565 | { | |
566 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
567 | ||
568 | cancel_work_sync(&ifibss->csa_connection_drop_work); | |
569 | } | |
570 | ||
52874a5e | 571 | static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta) |
8bf11d8d JB |
572 | __acquires(RCU) |
573 | { | |
574 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
575 | u8 addr[ETH_ALEN]; | |
576 | ||
577 | memcpy(addr, sta->sta.addr, ETH_ALEN); | |
578 | ||
bdcbd8e0 | 579 | ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr); |
8bf11d8d | 580 | |
83d5cc01 JB |
581 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); |
582 | sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); | |
267335d6 AQ |
583 | /* authorize the station only if the network is not RSN protected. If |
584 | * not wait for the userspace to authorize it */ | |
585 | if (!sta->sdata->u.ibss.control_port) | |
586 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); | |
8bf11d8d JB |
587 | |
588 | rate_control_rate_init(sta); | |
589 | ||
590 | /* If it fails, maybe we raced another insertion? */ | |
591 | if (sta_info_insert_rcu(sta)) | |
592 | return sta_info_get(sdata, addr); | |
593 | return sta; | |
594 | } | |
595 | ||
596 | static struct sta_info * | |
52874a5e AQ |
597 | ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid, |
598 | const u8 *addr, u32 supp_rates) | |
8bf11d8d JB |
599 | __acquires(RCU) |
600 | { | |
601 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
602 | struct ieee80211_local *local = sdata->local; | |
603 | struct sta_info *sta; | |
55de908a | 604 | struct ieee80211_chanctx_conf *chanctx_conf; |
b422c6cd | 605 | struct ieee80211_supported_band *sband; |
74608aca | 606 | enum nl80211_bss_scan_width scan_width; |
55de908a | 607 | int band; |
8bf11d8d JB |
608 | |
609 | /* | |
610 | * XXX: Consider removing the least recently used entry and | |
611 | * allow new one to be added. | |
612 | */ | |
613 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { | |
bdcbd8e0 | 614 | net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
e87cc472 | 615 | sdata->name, addr); |
8bf11d8d JB |
616 | rcu_read_lock(); |
617 | return NULL; | |
618 | } | |
619 | ||
620 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { | |
621 | rcu_read_lock(); | |
622 | return NULL; | |
623 | } | |
624 | ||
b203ca39 | 625 | if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) { |
8bf11d8d JB |
626 | rcu_read_lock(); |
627 | return NULL; | |
628 | } | |
629 | ||
55de908a JB |
630 | rcu_read_lock(); |
631 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
632 | if (WARN_ON_ONCE(!chanctx_conf)) | |
633 | return NULL; | |
4bf88530 | 634 | band = chanctx_conf->def.chan->band; |
74608aca | 635 | scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); |
55de908a JB |
636 | rcu_read_unlock(); |
637 | ||
8bf11d8d JB |
638 | sta = sta_info_alloc(sdata, addr, GFP_KERNEL); |
639 | if (!sta) { | |
640 | rcu_read_lock(); | |
641 | return NULL; | |
642 | } | |
643 | ||
644 | sta->last_rx = jiffies; | |
645 | ||
646 | /* make sure mandatory rates are always added */ | |
b422c6cd | 647 | sband = local->hw.wiphy->bands[band]; |
8bf11d8d | 648 | sta->sta.supp_rates[band] = supp_rates | |
74608aca | 649 | ieee80211_mandatory_rates(sband, scan_width); |
8bf11d8d | 650 | |
52874a5e | 651 | return ieee80211_ibss_finish_sta(sta); |
6d810f10 AQ |
652 | } |
653 | ||
871a4180 SW |
654 | static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) |
655 | { | |
656 | struct ieee80211_local *local = sdata->local; | |
657 | int active = 0; | |
658 | struct sta_info *sta; | |
659 | ||
660 | sdata_assert_lock(sdata); | |
661 | ||
662 | rcu_read_lock(); | |
663 | ||
664 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
665 | if (sta->sdata == sdata && | |
666 | time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL, | |
667 | jiffies)) { | |
668 | active++; | |
669 | break; | |
670 | } | |
671 | } | |
672 | ||
673 | rcu_read_unlock(); | |
674 | ||
675 | return active; | |
676 | } | |
677 | ||
678 | static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata) | |
679 | { | |
680 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
681 | struct ieee80211_local *local = sdata->local; | |
682 | struct cfg80211_bss *cbss; | |
683 | struct beacon_data *presp; | |
684 | struct sta_info *sta; | |
871a4180 SW |
685 | u16 capability; |
686 | ||
d4c80d9d | 687 | if (!is_zero_ether_addr(ifibss->bssid)) { |
871a4180 SW |
688 | capability = WLAN_CAPABILITY_IBSS; |
689 | ||
690 | if (ifibss->privacy) | |
691 | capability |= WLAN_CAPABILITY_PRIVACY; | |
692 | ||
693 | cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan, | |
694 | ifibss->bssid, ifibss->ssid, | |
695 | ifibss->ssid_len, WLAN_CAPABILITY_IBSS | | |
696 | WLAN_CAPABILITY_PRIVACY, | |
697 | capability); | |
698 | ||
699 | if (cbss) { | |
700 | cfg80211_unlink_bss(local->hw.wiphy, cbss); | |
701 | cfg80211_put_bss(sdata->local->hw.wiphy, cbss); | |
702 | } | |
703 | } | |
704 | ||
705 | ifibss->state = IEEE80211_IBSS_MLME_SEARCH; | |
706 | ||
707 | sta_info_flush(sdata); | |
708 | ||
709 | spin_lock_bh(&ifibss->incomplete_lock); | |
710 | while (!list_empty(&ifibss->incomplete_stations)) { | |
711 | sta = list_first_entry(&ifibss->incomplete_stations, | |
712 | struct sta_info, list); | |
713 | list_del(&sta->list); | |
714 | spin_unlock_bh(&ifibss->incomplete_lock); | |
715 | ||
716 | sta_info_free(local, sta); | |
717 | spin_lock_bh(&ifibss->incomplete_lock); | |
718 | } | |
719 | spin_unlock_bh(&ifibss->incomplete_lock); | |
720 | ||
721 | netif_carrier_off(sdata->dev); | |
722 | ||
723 | sdata->vif.bss_conf.ibss_joined = false; | |
724 | sdata->vif.bss_conf.ibss_creator = false; | |
725 | sdata->vif.bss_conf.enable_beacon = false; | |
726 | sdata->vif.bss_conf.ssid_len = 0; | |
727 | ||
728 | /* remove beacon */ | |
729 | presp = rcu_dereference_protected(ifibss->presp, | |
730 | lockdep_is_held(&sdata->wdev.mtx)); | |
731 | RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); | |
732 | if (presp) | |
733 | kfree_rcu(presp, rcu_head); | |
734 | ||
735 | clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); | |
736 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | | |
737 | BSS_CHANGED_IBSS); | |
55fff501 | 738 | drv_leave_ibss(local, sdata); |
34a3740d | 739 | mutex_lock(&local->mtx); |
871a4180 | 740 | ieee80211_vif_release_channel(sdata); |
34a3740d | 741 | mutex_unlock(&local->mtx); |
871a4180 SW |
742 | } |
743 | ||
cd7760e6 SW |
744 | static void ieee80211_csa_connection_drop_work(struct work_struct *work) |
745 | { | |
746 | struct ieee80211_sub_if_data *sdata = | |
747 | container_of(work, struct ieee80211_sub_if_data, | |
748 | u.ibss.csa_connection_drop_work); | |
749 | ||
6f07d216 LC |
750 | sdata_lock(sdata); |
751 | ||
cd7760e6 SW |
752 | ieee80211_ibss_disconnect(sdata); |
753 | synchronize_rcu(); | |
754 | skb_queue_purge(&sdata->skb_queue); | |
755 | ||
756 | /* trigger a scan to find another IBSS network to join */ | |
757 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); | |
6f07d216 LC |
758 | |
759 | sdata_unlock(sdata); | |
cd7760e6 SW |
760 | } |
761 | ||
8e8d347d SW |
762 | static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata) |
763 | { | |
764 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
765 | int err; | |
766 | ||
767 | /* if the current channel is a DFS channel, mark the channel as | |
768 | * unavailable. | |
769 | */ | |
770 | err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, | |
2beb6dab LC |
771 | &ifibss->chandef, |
772 | NL80211_IFTYPE_ADHOC); | |
8e8d347d SW |
773 | if (err > 0) |
774 | cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef, | |
775 | GFP_ATOMIC); | |
776 | } | |
777 | ||
cd7760e6 SW |
778 | static bool |
779 | ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata, | |
780 | struct ieee802_11_elems *elems, | |
781 | bool beacon) | |
782 | { | |
783 | struct cfg80211_csa_settings params; | |
c0f17eb9 | 784 | struct ieee80211_csa_ie csa_ie; |
cd7760e6 | 785 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
cd7760e6 | 786 | enum nl80211_channel_type ch_type; |
82a8e17d | 787 | int err; |
cd7760e6 | 788 | u32 sta_flags; |
cd7760e6 | 789 | |
dbd72850 MK |
790 | sdata_assert_lock(sdata); |
791 | ||
cd7760e6 SW |
792 | sta_flags = IEEE80211_STA_DISABLE_VHT; |
793 | switch (ifibss->chandef.width) { | |
794 | case NL80211_CHAN_WIDTH_5: | |
795 | case NL80211_CHAN_WIDTH_10: | |
796 | case NL80211_CHAN_WIDTH_20_NOHT: | |
797 | sta_flags |= IEEE80211_STA_DISABLE_HT; | |
798 | /* fall through */ | |
799 | case NL80211_CHAN_WIDTH_20: | |
800 | sta_flags |= IEEE80211_STA_DISABLE_40MHZ; | |
801 | break; | |
802 | default: | |
803 | break; | |
804 | } | |
805 | ||
806 | memset(¶ms, 0, sizeof(params)); | |
c0f17eb9 | 807 | memset(&csa_ie, 0, sizeof(csa_ie)); |
84469a45 | 808 | err = ieee80211_parse_ch_switch_ie(sdata, elems, |
cd7760e6 | 809 | ifibss->chandef.chan->band, |
c0f17eb9 | 810 | sta_flags, ifibss->bssid, &csa_ie); |
cd7760e6 SW |
811 | /* can't switch to destination channel, fail */ |
812 | if (err < 0) | |
813 | goto disconnect; | |
814 | ||
815 | /* did not contain a CSA */ | |
816 | if (err) | |
817 | return false; | |
818 | ||
0834ae3c SW |
819 | /* channel switch is not supported, disconnect */ |
820 | if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH)) | |
821 | goto disconnect; | |
822 | ||
c0f17eb9 CYY |
823 | params.count = csa_ie.count; |
824 | params.chandef = csa_ie.chandef; | |
825 | ||
cd7760e6 SW |
826 | switch (ifibss->chandef.width) { |
827 | case NL80211_CHAN_WIDTH_20_NOHT: | |
828 | case NL80211_CHAN_WIDTH_20: | |
829 | case NL80211_CHAN_WIDTH_40: | |
830 | /* keep our current HT mode (HT20/HT40+/HT40-), even if | |
831 | * another mode has been announced. The mode is not adopted | |
832 | * within the beacon while doing CSA and we should therefore | |
833 | * keep the mode which we announce. | |
834 | */ | |
835 | ch_type = cfg80211_get_chandef_type(&ifibss->chandef); | |
836 | cfg80211_chandef_create(¶ms.chandef, params.chandef.chan, | |
837 | ch_type); | |
838 | break; | |
839 | case NL80211_CHAN_WIDTH_5: | |
840 | case NL80211_CHAN_WIDTH_10: | |
841 | if (params.chandef.width != ifibss->chandef.width) { | |
842 | sdata_info(sdata, | |
843 | "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", | |
844 | ifibss->bssid, | |
845 | params.chandef.chan->center_freq, | |
846 | params.chandef.width, | |
847 | params.chandef.center_freq1, | |
848 | params.chandef.center_freq2); | |
849 | goto disconnect; | |
850 | } | |
851 | break; | |
852 | default: | |
853 | /* should not happen, sta_flags should prevent VHT modes. */ | |
854 | WARN_ON(1); | |
855 | goto disconnect; | |
856 | } | |
857 | ||
174e0cd2 IP |
858 | if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef, |
859 | NL80211_IFTYPE_ADHOC)) { | |
cd7760e6 SW |
860 | sdata_info(sdata, |
861 | "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", | |
862 | ifibss->bssid, | |
863 | params.chandef.chan->center_freq, | |
864 | params.chandef.width, | |
865 | params.chandef.center_freq1, | |
866 | params.chandef.center_freq2); | |
867 | goto disconnect; | |
868 | } | |
869 | ||
870 | err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, | |
2beb6dab LC |
871 | ¶ms.chandef, |
872 | NL80211_IFTYPE_ADHOC); | |
cd7760e6 SW |
873 | if (err < 0) |
874 | goto disconnect; | |
2beb6dab | 875 | if (err > 0 && !ifibss->userspace_handles_dfs) { |
8e8d347d | 876 | /* IBSS-DFS only allowed with a control program */ |
2beb6dab | 877 | goto disconnect; |
cd7760e6 SW |
878 | } |
879 | ||
2beb6dab LC |
880 | params.radar_required = err; |
881 | ||
82a8e17d LC |
882 | if (cfg80211_chandef_identical(¶ms.chandef, |
883 | &sdata->vif.bss_conf.chandef)) { | |
884 | ibss_dbg(sdata, | |
885 | "received csa with an identical chandef, ignoring\n"); | |
886 | return true; | |
cd7760e6 | 887 | } |
cd7760e6 SW |
888 | |
889 | /* all checks done, now perform the channel switch. */ | |
890 | ibss_dbg(sdata, | |
891 | "received channel switch announcement to go to channel %d MHz\n", | |
892 | params.chandef.chan->center_freq); | |
893 | ||
c0f17eb9 | 894 | params.block_tx = !!csa_ie.mode; |
cd7760e6 | 895 | |
82a8e17d LC |
896 | if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev, |
897 | ¶ms)) | |
898 | goto disconnect; | |
cd7760e6 | 899 | |
8e8d347d SW |
900 | ieee80211_ibss_csa_mark_radar(sdata); |
901 | ||
cd7760e6 SW |
902 | return true; |
903 | disconnect: | |
904 | ibss_dbg(sdata, "Can't handle channel switch, disconnect\n"); | |
905 | ieee80211_queue_work(&sdata->local->hw, | |
906 | &ifibss->csa_connection_drop_work); | |
907 | ||
8e8d347d SW |
908 | ieee80211_ibss_csa_mark_radar(sdata); |
909 | ||
cd7760e6 SW |
910 | return true; |
911 | } | |
912 | ||
913 | static void | |
914 | ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata, | |
915 | struct ieee80211_mgmt *mgmt, size_t len, | |
916 | struct ieee80211_rx_status *rx_status, | |
917 | struct ieee802_11_elems *elems) | |
918 | { | |
919 | int required_len; | |
920 | ||
921 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
922 | return; | |
923 | ||
924 | /* CSA is the only action we handle for now */ | |
925 | if (mgmt->u.action.u.measurement.action_code != | |
926 | WLAN_ACTION_SPCT_CHL_SWITCH) | |
927 | return; | |
928 | ||
929 | required_len = IEEE80211_MIN_ACTION_SIZE + | |
930 | sizeof(mgmt->u.action.u.chan_switch); | |
931 | if (len < required_len) | |
932 | return; | |
933 | ||
82a8e17d LC |
934 | if (!sdata->vif.csa_active) |
935 | ieee80211_ibss_process_chanswitch(sdata, elems, false); | |
cd7760e6 SW |
936 | } |
937 | ||
2cc59e78 AQ |
938 | static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata, |
939 | struct ieee80211_mgmt *mgmt, | |
940 | size_t len) | |
941 | { | |
942 | u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code); | |
943 | ||
944 | if (len < IEEE80211_DEAUTH_FRAME_LEN) | |
945 | return; | |
946 | ||
947 | ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n", | |
948 | mgmt->sa, mgmt->da, mgmt->bssid, reason); | |
949 | sta_info_destroy_addr(sdata, mgmt->sa); | |
950 | } | |
951 | ||
6d810f10 AQ |
952 | static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, |
953 | struct ieee80211_mgmt *mgmt, | |
954 | size_t len) | |
955 | { | |
956 | u16 auth_alg, auth_transaction; | |
957 | ||
8d61ffa5 | 958 | sdata_assert_lock(sdata); |
6d810f10 AQ |
959 | |
960 | if (len < 24 + 6) | |
961 | return; | |
962 | ||
963 | auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); | |
964 | auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); | |
965 | ||
bdcbd8e0 JB |
966 | ibss_dbg(sdata, |
967 | "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n", | |
968 | mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction); | |
7bed2050 AQ |
969 | |
970 | if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) | |
971 | return; | |
972 | ||
6d810f10 AQ |
973 | /* |
974 | * IEEE 802.11 standard does not require authentication in IBSS | |
975 | * networks and most implementations do not seem to use it. | |
976 | * However, try to reply to authentication attempts if someone | |
977 | * has actually implemented this. | |
978 | */ | |
700e8ea6 | 979 | ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0, |
1672c0e3 | 980 | mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0); |
8bf11d8d JB |
981 | } |
982 | ||
46900298 | 983 | static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, |
d45c4172 | 984 | struct ieee80211_mgmt *mgmt, size_t len, |
46900298 | 985 | struct ieee80211_rx_status *rx_status, |
d45c4172 | 986 | struct ieee802_11_elems *elems) |
46900298 JB |
987 | { |
988 | struct ieee80211_local *local = sdata->local; | |
0c1ad2ca | 989 | struct cfg80211_bss *cbss; |
46900298 JB |
990 | struct ieee80211_bss *bss; |
991 | struct sta_info *sta; | |
992 | struct ieee80211_channel *channel; | |
993 | u64 beacon_timestamp, rx_timestamp; | |
994 | u32 supp_rates = 0; | |
995 | enum ieee80211_band band = rx_status->band; | |
74608aca | 996 | enum nl80211_bss_scan_width scan_width; |
13c40c54 AS |
997 | struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; |
998 | bool rates_updated = false; | |
46900298 | 999 | |
3afc2167 EG |
1000 | channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); |
1001 | if (!channel) | |
46900298 JB |
1002 | return; |
1003 | ||
9eba6125 | 1004 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC && |
b203ca39 | 1005 | ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) { |
46900298 JB |
1006 | |
1007 | rcu_read_lock(); | |
abe60632 | 1008 | sta = sta_info_get(sdata, mgmt->sa); |
46900298 | 1009 | |
9eba6125 | 1010 | if (elems->supp_rates) { |
2103dec1 | 1011 | supp_rates = ieee80211_sta_get_rates(sdata, elems, |
9ebb61a2 | 1012 | band, NULL); |
9eba6125 BR |
1013 | if (sta) { |
1014 | u32 prev_rates; | |
1015 | ||
1016 | prev_rates = sta->sta.supp_rates[band]; | |
1017 | /* make sure mandatory rates are always added */ | |
74608aca SW |
1018 | scan_width = NL80211_BSS_CHAN_WIDTH_20; |
1019 | if (rx_status->flag & RX_FLAG_5MHZ) | |
1020 | scan_width = NL80211_BSS_CHAN_WIDTH_5; | |
1021 | if (rx_status->flag & RX_FLAG_10MHZ) | |
1022 | scan_width = NL80211_BSS_CHAN_WIDTH_10; | |
46900298 | 1023 | |
74608aca SW |
1024 | sta->sta.supp_rates[band] = supp_rates | |
1025 | ieee80211_mandatory_rates(sband, | |
1026 | scan_width); | |
9eba6125 | 1027 | if (sta->sta.supp_rates[band] != prev_rates) { |
bdcbd8e0 JB |
1028 | ibss_dbg(sdata, |
1029 | "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", | |
1030 | sta->sta.addr, prev_rates, | |
1031 | sta->sta.supp_rates[band]); | |
13c40c54 | 1032 | rates_updated = true; |
9eba6125 | 1033 | } |
8bf11d8d JB |
1034 | } else { |
1035 | rcu_read_unlock(); | |
9eba6125 | 1036 | sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, |
52874a5e | 1037 | mgmt->sa, supp_rates); |
8bf11d8d | 1038 | } |
34e89507 | 1039 | } |
9eba6125 BR |
1040 | |
1041 | if (sta && elems->wmm_info) | |
a74a8c84 | 1042 | sta->sta.wme = true; |
9eba6125 | 1043 | |
074d46d1 | 1044 | if (sta && elems->ht_operation && elems->ht_cap_elem && |
3aede78a SW |
1045 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT && |
1046 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 && | |
1047 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) { | |
13c40c54 | 1048 | /* we both use HT */ |
e1a0c6b3 | 1049 | struct ieee80211_ht_cap htcap_ie; |
4bf88530 JB |
1050 | struct cfg80211_chan_def chandef; |
1051 | ||
1052 | ieee80211_ht_oper_to_chandef(channel, | |
1053 | elems->ht_operation, | |
1054 | &chandef); | |
13c40c54 | 1055 | |
e1a0c6b3 | 1056 | memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie)); |
13c40c54 AS |
1057 | |
1058 | /* | |
1059 | * fall back to HT20 if we don't use or use | |
1060 | * the other extension channel | |
1061 | */ | |
3aede78a SW |
1062 | if (chandef.center_freq1 != |
1063 | sdata->u.ibss.chandef.center_freq1) | |
e1a0c6b3 JB |
1064 | htcap_ie.cap_info &= |
1065 | cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40); | |
1066 | ||
1067 | rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap( | |
1068 | sdata, sband, &htcap_ie, sta); | |
13c40c54 AS |
1069 | } |
1070 | ||
e687f61e | 1071 | if (sta && rates_updated) { |
d2954457 JD |
1072 | u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED; |
1073 | u8 rx_nss = sta->sta.rx_nss; | |
1074 | ||
1075 | /* Force rx_nss recalculation */ | |
1076 | sta->sta.rx_nss = 0; | |
13c40c54 | 1077 | rate_control_rate_init(sta); |
d2954457 JD |
1078 | if (sta->sta.rx_nss != rx_nss) |
1079 | changed |= IEEE80211_RC_NSS_CHANGED; | |
1080 | ||
1081 | drv_sta_rc_update(local, sdata, &sta->sta, changed); | |
e687f61e | 1082 | } |
13c40c54 | 1083 | |
9eba6125 | 1084 | rcu_read_unlock(); |
46900298 JB |
1085 | } |
1086 | ||
1087 | bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, | |
d45c4172 | 1088 | channel); |
46900298 JB |
1089 | if (!bss) |
1090 | return; | |
1091 | ||
0c1ad2ca JB |
1092 | cbss = container_of((void *)bss, struct cfg80211_bss, priv); |
1093 | ||
8cef2c9d JB |
1094 | /* same for beacon and probe response */ |
1095 | beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp); | |
46900298 JB |
1096 | |
1097 | /* check if we need to merge IBSS */ | |
1098 | ||
46900298 | 1099 | /* not an IBSS */ |
0c1ad2ca | 1100 | if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) |
46900298 JB |
1101 | goto put_bss; |
1102 | ||
1103 | /* different channel */ | |
55de908a | 1104 | if (sdata->u.ibss.fixed_channel && |
3aede78a | 1105 | sdata->u.ibss.chandef.chan != cbss->channel) |
46900298 JB |
1106 | goto put_bss; |
1107 | ||
1108 | /* different SSID */ | |
1109 | if (elems->ssid_len != sdata->u.ibss.ssid_len || | |
1110 | memcmp(elems->ssid, sdata->u.ibss.ssid, | |
1111 | sdata->u.ibss.ssid_len)) | |
1112 | goto put_bss; | |
1113 | ||
cd7760e6 | 1114 | /* process channel switch */ |
82a8e17d LC |
1115 | if (sdata->vif.csa_active || |
1116 | ieee80211_ibss_process_chanswitch(sdata, elems, true)) | |
cd7760e6 SW |
1117 | goto put_bss; |
1118 | ||
34e8f082 | 1119 | /* same BSSID */ |
b203ca39 | 1120 | if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) |
34e8f082 AF |
1121 | goto put_bss; |
1122 | ||
cd7760e6 SW |
1123 | /* we use a fixed BSSID */ |
1124 | if (sdata->u.ibss.fixed_bssid) | |
1125 | goto put_bss; | |
1126 | ||
f4bda337 TP |
1127 | if (ieee80211_have_rx_timestamp(rx_status)) { |
1128 | /* time when timestamp field was received */ | |
1129 | rx_timestamp = | |
1130 | ieee80211_calculate_rx_timestamp(local, rx_status, | |
1131 | len + FCS_LEN, 24); | |
24487981 JB |
1132 | } else { |
1133 | /* | |
1134 | * second best option: get current TSF | |
1135 | * (will return -1 if not supported) | |
1136 | */ | |
37a41b4a | 1137 | rx_timestamp = drv_get_tsf(local, sdata); |
24487981 | 1138 | } |
46900298 | 1139 | |
bdcbd8e0 JB |
1140 | ibss_dbg(sdata, |
1141 | "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", | |
1142 | mgmt->sa, mgmt->bssid, | |
1143 | (unsigned long long)rx_timestamp, | |
1144 | (unsigned long long)beacon_timestamp, | |
1145 | (unsigned long long)(rx_timestamp - beacon_timestamp), | |
1146 | jiffies); | |
46900298 JB |
1147 | |
1148 | if (beacon_timestamp > rx_timestamp) { | |
bdcbd8e0 JB |
1149 | ibss_dbg(sdata, |
1150 | "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", | |
1151 | mgmt->bssid); | |
46900298 | 1152 | ieee80211_sta_join_ibss(sdata, bss); |
2103dec1 | 1153 | supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL); |
34e89507 | 1154 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, |
52874a5e | 1155 | supp_rates); |
8bf11d8d | 1156 | rcu_read_unlock(); |
46900298 JB |
1157 | } |
1158 | ||
1159 | put_bss: | |
1160 | ieee80211_rx_bss_put(local, bss); | |
1161 | } | |
1162 | ||
8bf11d8d JB |
1163 | void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, |
1164 | const u8 *bssid, const u8 *addr, | |
1165 | u32 supp_rates) | |
46900298 | 1166 | { |
2e10d330 | 1167 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
46900298 JB |
1168 | struct ieee80211_local *local = sdata->local; |
1169 | struct sta_info *sta; | |
55de908a | 1170 | struct ieee80211_chanctx_conf *chanctx_conf; |
b422c6cd | 1171 | struct ieee80211_supported_band *sband; |
74608aca | 1172 | enum nl80211_bss_scan_width scan_width; |
55de908a | 1173 | int band; |
46900298 | 1174 | |
af8cdcd8 JB |
1175 | /* |
1176 | * XXX: Consider removing the least recently used entry and | |
1177 | * allow new one to be added. | |
1178 | */ | |
46900298 | 1179 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { |
bdcbd8e0 | 1180 | net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
e87cc472 | 1181 | sdata->name, addr); |
8bf11d8d | 1182 | return; |
46900298 JB |
1183 | } |
1184 | ||
2e10d330 | 1185 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) |
8bf11d8d | 1186 | return; |
2e10d330 | 1187 | |
b203ca39 | 1188 | if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) |
8bf11d8d | 1189 | return; |
46900298 | 1190 | |
55de908a JB |
1191 | rcu_read_lock(); |
1192 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
1193 | if (WARN_ON_ONCE(!chanctx_conf)) { | |
1194 | rcu_read_unlock(); | |
1195 | return; | |
1196 | } | |
4bf88530 | 1197 | band = chanctx_conf->def.chan->band; |
74608aca | 1198 | scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); |
55de908a JB |
1199 | rcu_read_unlock(); |
1200 | ||
8bf11d8d | 1201 | sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); |
46900298 | 1202 | if (!sta) |
8bf11d8d | 1203 | return; |
46900298 | 1204 | |
c8716d9d | 1205 | sta->last_rx = jiffies; |
d9a7ddb0 | 1206 | |
46900298 | 1207 | /* make sure mandatory rates are always added */ |
b422c6cd | 1208 | sband = local->hw.wiphy->bands[band]; |
46900298 | 1209 | sta->sta.supp_rates[band] = supp_rates | |
74608aca | 1210 | ieee80211_mandatory_rates(sband, scan_width); |
46900298 | 1211 | |
8bf11d8d JB |
1212 | spin_lock(&ifibss->incomplete_lock); |
1213 | list_add(&sta->list, &ifibss->incomplete_stations); | |
1214 | spin_unlock(&ifibss->incomplete_lock); | |
1215 | ieee80211_queue_work(&local->hw, &sdata->work); | |
46900298 JB |
1216 | } |
1217 | ||
dad9defd AQ |
1218 | static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata) |
1219 | { | |
1220 | struct ieee80211_local *local = sdata->local; | |
1221 | struct sta_info *sta, *tmp; | |
1222 | unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT; | |
1223 | unsigned long exp_rsn_time = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT; | |
1224 | ||
1225 | mutex_lock(&local->sta_mtx); | |
1226 | ||
1227 | list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { | |
1228 | if (sdata != sta->sdata) | |
1229 | continue; | |
1230 | ||
1231 | if (time_after(jiffies, sta->last_rx + exp_time) || | |
1232 | (time_after(jiffies, sta->last_rx + exp_rsn_time) && | |
1233 | sta->sta_state != IEEE80211_STA_AUTHORIZED)) { | |
1234 | sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n", | |
1235 | sta->sta_state != IEEE80211_STA_AUTHORIZED ? | |
1236 | "not authorized " : "", sta->sta.addr); | |
1237 | ||
1238 | WARN_ON(__sta_info_destroy(sta)); | |
1239 | } | |
1240 | } | |
1241 | ||
1242 | mutex_unlock(&local->sta_mtx); | |
1243 | } | |
1244 | ||
ce9058ae BP |
1245 | /* |
1246 | * This function is called with state == IEEE80211_IBSS_MLME_JOINED | |
1247 | */ | |
46900298 JB |
1248 | |
1249 | static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) | |
1250 | { | |
1251 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
7ca15a0a | 1252 | enum nl80211_bss_scan_width scan_width; |
46900298 | 1253 | |
8d61ffa5 | 1254 | sdata_assert_lock(sdata); |
7a17a33c | 1255 | |
af8cdcd8 JB |
1256 | mod_timer(&ifibss->timer, |
1257 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 | 1258 | |
dad9defd | 1259 | ieee80211_ibss_sta_expire(sdata); |
af8cdcd8 | 1260 | |
450aae3d S |
1261 | if (time_before(jiffies, ifibss->last_scan_completed + |
1262 | IEEE80211_IBSS_MERGE_INTERVAL)) | |
1263 | return; | |
1264 | ||
46900298 JB |
1265 | if (ieee80211_sta_active_ibss(sdata)) |
1266 | return; | |
1267 | ||
c037b836 | 1268 | if (ifibss->fixed_channel) |
46900298 JB |
1269 | return; |
1270 | ||
bdcbd8e0 JB |
1271 | sdata_info(sdata, |
1272 | "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); | |
46900298 | 1273 | |
7ca15a0a | 1274 | scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); |
34bcf715 | 1275 | ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len, |
7ca15a0a | 1276 | NULL, scan_width); |
46900298 JB |
1277 | } |
1278 | ||
af8cdcd8 | 1279 | static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
1280 | { |
1281 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
46900298 | 1282 | u8 bssid[ETH_ALEN]; |
46900298 JB |
1283 | u16 capability; |
1284 | int i; | |
1285 | ||
8d61ffa5 | 1286 | sdata_assert_lock(sdata); |
7a17a33c | 1287 | |
af8cdcd8 | 1288 | if (ifibss->fixed_bssid) { |
46900298 JB |
1289 | memcpy(bssid, ifibss->bssid, ETH_ALEN); |
1290 | } else { | |
1291 | /* Generate random, not broadcast, locally administered BSSID. Mix in | |
1292 | * own MAC address to make sure that devices that do not have proper | |
1293 | * random number generator get different BSSID. */ | |
1294 | get_random_bytes(bssid, ETH_ALEN); | |
1295 | for (i = 0; i < ETH_ALEN; i++) | |
47846c9b | 1296 | bssid[i] ^= sdata->vif.addr[i]; |
46900298 JB |
1297 | bssid[0] &= ~0x01; |
1298 | bssid[0] |= 0x02; | |
1299 | } | |
1300 | ||
bdcbd8e0 | 1301 | sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); |
46900298 | 1302 | |
46900298 JB |
1303 | capability = WLAN_CAPABILITY_IBSS; |
1304 | ||
fffd0934 | 1305 | if (ifibss->privacy) |
46900298 JB |
1306 | capability |= WLAN_CAPABILITY_PRIVACY; |
1307 | else | |
1308 | sdata->drop_unencrypted = 0; | |
1309 | ||
57c4d7b4 | 1310 | __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, |
75a423f4 | 1311 | &ifibss->chandef, ifibss->basic_rates, |
c13a765b | 1312 | capability, 0, true); |
46900298 JB |
1313 | } |
1314 | ||
ce9058ae BP |
1315 | /* |
1316 | * This function is called with state == IEEE80211_IBSS_MLME_SEARCH | |
1317 | */ | |
1318 | ||
af8cdcd8 | 1319 | static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
1320 | { |
1321 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1322 | struct ieee80211_local *local = sdata->local; | |
0c1ad2ca | 1323 | struct cfg80211_bss *cbss; |
af8cdcd8 | 1324 | struct ieee80211_channel *chan = NULL; |
46900298 | 1325 | const u8 *bssid = NULL; |
7ca15a0a | 1326 | enum nl80211_bss_scan_width scan_width; |
46900298 | 1327 | int active_ibss; |
e0d61887 | 1328 | u16 capability; |
46900298 | 1329 | |
8d61ffa5 | 1330 | sdata_assert_lock(sdata); |
7a17a33c | 1331 | |
46900298 | 1332 | active_ibss = ieee80211_sta_active_ibss(sdata); |
bdcbd8e0 | 1333 | ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); |
46900298 JB |
1334 | |
1335 | if (active_ibss) | |
af8cdcd8 | 1336 | return; |
46900298 | 1337 | |
e0d61887 | 1338 | capability = WLAN_CAPABILITY_IBSS; |
fffd0934 | 1339 | if (ifibss->privacy) |
e0d61887 | 1340 | capability |= WLAN_CAPABILITY_PRIVACY; |
af8cdcd8 JB |
1341 | if (ifibss->fixed_bssid) |
1342 | bssid = ifibss->bssid; | |
1343 | if (ifibss->fixed_channel) | |
3aede78a | 1344 | chan = ifibss->chandef.chan; |
af8cdcd8 | 1345 | if (!is_zero_ether_addr(ifibss->bssid)) |
46900298 | 1346 | bssid = ifibss->bssid; |
0c1ad2ca JB |
1347 | cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, |
1348 | ifibss->ssid, ifibss->ssid_len, | |
1349 | WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY, | |
1350 | capability); | |
1351 | ||
1352 | if (cbss) { | |
1353 | struct ieee80211_bss *bss; | |
46900298 | 1354 | |
0c1ad2ca | 1355 | bss = (void *)cbss->priv; |
bdcbd8e0 JB |
1356 | ibss_dbg(sdata, |
1357 | "sta_find_ibss: selected %pM current %pM\n", | |
1358 | cbss->bssid, ifibss->bssid); | |
1359 | sdata_info(sdata, | |
1360 | "Selected IBSS BSSID %pM based on configured SSID\n", | |
1361 | cbss->bssid); | |
46900298 | 1362 | |
af8cdcd8 | 1363 | ieee80211_sta_join_ibss(sdata, bss); |
46900298 | 1364 | ieee80211_rx_bss_put(local, bss); |
af8cdcd8 | 1365 | return; |
d419b9f0 | 1366 | } |
46900298 | 1367 | |
d8eb741e AQ |
1368 | /* if a fixed bssid and a fixed freq have been provided create the IBSS |
1369 | * directly and do not waste time scanning | |
1370 | */ | |
1371 | if (ifibss->fixed_bssid && ifibss->fixed_channel) { | |
1372 | sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n", | |
1373 | bssid); | |
1374 | ieee80211_sta_create_ibss(sdata); | |
1375 | return; | |
1376 | } | |
1377 | ||
1378 | ||
bdcbd8e0 | 1379 | ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); |
46900298 JB |
1380 | |
1381 | /* Selected IBSS not found in current scan results - try to scan */ | |
ce9058ae | 1382 | if (time_after(jiffies, ifibss->last_scan_completed + |
46900298 | 1383 | IEEE80211_SCAN_INTERVAL)) { |
bdcbd8e0 | 1384 | sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); |
46900298 | 1385 | |
7ca15a0a | 1386 | scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); |
34bcf715 | 1387 | ieee80211_request_ibss_scan(sdata, ifibss->ssid, |
7ca15a0a SW |
1388 | ifibss->ssid_len, chan, |
1389 | scan_width); | |
ce9058ae | 1390 | } else { |
46900298 JB |
1391 | int interval = IEEE80211_SCAN_INTERVAL; |
1392 | ||
1393 | if (time_after(jiffies, ifibss->ibss_join_req + | |
55de908a JB |
1394 | IEEE80211_IBSS_JOIN_TIMEOUT)) |
1395 | ieee80211_sta_create_ibss(sdata); | |
46900298 | 1396 | |
af8cdcd8 JB |
1397 | mod_timer(&ifibss->timer, |
1398 | round_jiffies(jiffies + interval)); | |
46900298 | 1399 | } |
46900298 JB |
1400 | } |
1401 | ||
1402 | static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, | |
c269a203 | 1403 | struct sk_buff *req) |
46900298 | 1404 | { |
c269a203 | 1405 | struct ieee80211_mgmt *mgmt = (void *)req->data; |
46900298 JB |
1406 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
1407 | struct ieee80211_local *local = sdata->local; | |
c269a203 | 1408 | int tx_last_beacon, len = req->len; |
46900298 | 1409 | struct sk_buff *skb; |
c3ffeab4 | 1410 | struct beacon_data *presp; |
46900298 JB |
1411 | u8 *pos, *end; |
1412 | ||
8d61ffa5 | 1413 | sdata_assert_lock(sdata); |
7a17a33c | 1414 | |
40b275b6 | 1415 | presp = rcu_dereference_protected(ifibss->presp, |
8d61ffa5 | 1416 | lockdep_is_held(&sdata->wdev.mtx)); |
40b275b6 | 1417 | |
46900298 | 1418 | if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || |
40b275b6 | 1419 | len < 24 + 2 || !presp) |
46900298 JB |
1420 | return; |
1421 | ||
24487981 | 1422 | tx_last_beacon = drv_tx_last_beacon(local); |
46900298 | 1423 | |
bdcbd8e0 JB |
1424 | ibss_dbg(sdata, |
1425 | "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n", | |
1426 | mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon); | |
46900298 | 1427 | |
1ed76487 | 1428 | if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) |
46900298 JB |
1429 | return; |
1430 | ||
b203ca39 | 1431 | if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && |
888d04df | 1432 | !is_broadcast_ether_addr(mgmt->bssid)) |
46900298 JB |
1433 | return; |
1434 | ||
1435 | end = ((u8 *) mgmt) + len; | |
1436 | pos = mgmt->u.probe_req.variable; | |
1437 | if (pos[0] != WLAN_EID_SSID || | |
1438 | pos + 2 + pos[1] > end) { | |
bdcbd8e0 JB |
1439 | ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", |
1440 | mgmt->sa); | |
46900298 JB |
1441 | return; |
1442 | } | |
1443 | if (pos[1] != 0 && | |
1444 | (pos[1] != ifibss->ssid_len || | |
0da780c2 | 1445 | memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { |
46900298 JB |
1446 | /* Ignore ProbeReq for foreign SSID */ |
1447 | return; | |
1448 | } | |
1449 | ||
1450 | /* Reply with ProbeResp */ | |
c3ffeab4 | 1451 | skb = dev_alloc_skb(local->tx_headroom + presp->head_len); |
46900298 JB |
1452 | if (!skb) |
1453 | return; | |
1454 | ||
c3ffeab4 JB |
1455 | skb_reserve(skb, local->tx_headroom); |
1456 | memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len); | |
1457 | ||
1458 | memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN); | |
1459 | ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa); | |
62ae67be | 1460 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
691eb61b SW |
1461 | |
1462 | /* avoid excessive retries for probe request to wildcard SSIDs */ | |
1463 | if (pos[1] == 0) | |
1464 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK; | |
1465 | ||
62ae67be | 1466 | ieee80211_tx_skb(sdata, skb); |
46900298 JB |
1467 | } |
1468 | ||
d45c4172 EG |
1469 | static |
1470 | void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata, | |
1471 | struct ieee80211_mgmt *mgmt, size_t len, | |
1472 | struct ieee80211_rx_status *rx_status) | |
46900298 JB |
1473 | { |
1474 | size_t baselen; | |
1475 | struct ieee802_11_elems elems; | |
1476 | ||
d45c4172 EG |
1477 | BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) != |
1478 | offsetof(typeof(mgmt->u.beacon), variable)); | |
1479 | ||
1480 | /* | |
1481 | * either beacon or probe_resp but the variable field is at the | |
1482 | * same offset | |
1483 | */ | |
46900298 JB |
1484 | baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; |
1485 | if (baselen > len) | |
1486 | return; | |
1487 | ||
1488 | ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, | |
b2e506bf | 1489 | false, &elems); |
46900298 | 1490 | |
d45c4172 | 1491 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); |
46900298 JB |
1492 | } |
1493 | ||
1fa57d01 JB |
1494 | void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, |
1495 | struct sk_buff *skb) | |
46900298 JB |
1496 | { |
1497 | struct ieee80211_rx_status *rx_status; | |
1498 | struct ieee80211_mgmt *mgmt; | |
1499 | u16 fc; | |
cd7760e6 SW |
1500 | struct ieee802_11_elems elems; |
1501 | int ies_len; | |
46900298 | 1502 | |
f1d58c25 | 1503 | rx_status = IEEE80211_SKB_RXCB(skb); |
46900298 JB |
1504 | mgmt = (struct ieee80211_mgmt *) skb->data; |
1505 | fc = le16_to_cpu(mgmt->frame_control); | |
1506 | ||
8d61ffa5 | 1507 | sdata_lock(sdata); |
7a17a33c | 1508 | |
c926d006 TH |
1509 | if (!sdata->u.ibss.ssid_len) |
1510 | goto mgmt_out; /* not ready to merge yet */ | |
1511 | ||
46900298 JB |
1512 | switch (fc & IEEE80211_FCTL_STYPE) { |
1513 | case IEEE80211_STYPE_PROBE_REQ: | |
c269a203 | 1514 | ieee80211_rx_mgmt_probe_req(sdata, skb); |
46900298 JB |
1515 | break; |
1516 | case IEEE80211_STYPE_PROBE_RESP: | |
46900298 | 1517 | case IEEE80211_STYPE_BEACON: |
d45c4172 EG |
1518 | ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len, |
1519 | rx_status); | |
46900298 JB |
1520 | break; |
1521 | case IEEE80211_STYPE_AUTH: | |
1522 | ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); | |
1523 | break; | |
2cc59e78 AQ |
1524 | case IEEE80211_STYPE_DEAUTH: |
1525 | ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); | |
1526 | break; | |
cd7760e6 SW |
1527 | case IEEE80211_STYPE_ACTION: |
1528 | switch (mgmt->u.action.category) { | |
1529 | case WLAN_CATEGORY_SPECTRUM_MGMT: | |
1530 | ies_len = skb->len - | |
1531 | offsetof(struct ieee80211_mgmt, | |
1532 | u.action.u.chan_switch.variable); | |
1533 | ||
1534 | if (ies_len < 0) | |
1535 | break; | |
1536 | ||
1537 | ieee802_11_parse_elems( | |
1538 | mgmt->u.action.u.chan_switch.variable, | |
1539 | ies_len, true, &elems); | |
1540 | ||
1541 | if (elems.parse_error) | |
1542 | break; | |
1543 | ||
1544 | ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len, | |
1545 | rx_status, &elems); | |
1546 | break; | |
1547 | } | |
46900298 | 1548 | } |
7a17a33c | 1549 | |
c926d006 | 1550 | mgmt_out: |
8d61ffa5 | 1551 | sdata_unlock(sdata); |
46900298 JB |
1552 | } |
1553 | ||
1fa57d01 | 1554 | void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) |
46900298 | 1555 | { |
1fa57d01 | 1556 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
8bf11d8d | 1557 | struct sta_info *sta; |
46900298 | 1558 | |
8d61ffa5 | 1559 | sdata_lock(sdata); |
7a17a33c JB |
1560 | |
1561 | /* | |
1562 | * Work could be scheduled after scan or similar | |
1563 | * when we aren't even joined (or trying) with a | |
1564 | * network. | |
1565 | */ | |
1566 | if (!ifibss->ssid_len) | |
1567 | goto out; | |
46900298 | 1568 | |
8bf11d8d JB |
1569 | spin_lock_bh(&ifibss->incomplete_lock); |
1570 | while (!list_empty(&ifibss->incomplete_stations)) { | |
1571 | sta = list_first_entry(&ifibss->incomplete_stations, | |
1572 | struct sta_info, list); | |
1573 | list_del(&sta->list); | |
1574 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1575 | ||
52874a5e | 1576 | ieee80211_ibss_finish_sta(sta); |
8bf11d8d JB |
1577 | rcu_read_unlock(); |
1578 | spin_lock_bh(&ifibss->incomplete_lock); | |
1579 | } | |
1580 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1581 | ||
46900298 JB |
1582 | switch (ifibss->state) { |
1583 | case IEEE80211_IBSS_MLME_SEARCH: | |
1584 | ieee80211_sta_find_ibss(sdata); | |
1585 | break; | |
1586 | case IEEE80211_IBSS_MLME_JOINED: | |
1587 | ieee80211_sta_merge_ibss(sdata); | |
1588 | break; | |
1589 | default: | |
1590 | WARN_ON(1); | |
1591 | break; | |
1592 | } | |
46900298 | 1593 | |
7a17a33c | 1594 | out: |
8d61ffa5 | 1595 | sdata_unlock(sdata); |
3a4d4aa2 JB |
1596 | } |
1597 | ||
46900298 JB |
1598 | static void ieee80211_ibss_timer(unsigned long data) |
1599 | { | |
1600 | struct ieee80211_sub_if_data *sdata = | |
1601 | (struct ieee80211_sub_if_data *) data; | |
5bb644a0 | 1602 | |
a6182943 | 1603 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
5bb644a0 | 1604 | } |
5bb644a0 | 1605 | |
46900298 JB |
1606 | void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) |
1607 | { | |
1608 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1609 | ||
46900298 JB |
1610 | setup_timer(&ifibss->timer, ieee80211_ibss_timer, |
1611 | (unsigned long) sdata); | |
8bf11d8d JB |
1612 | INIT_LIST_HEAD(&ifibss->incomplete_stations); |
1613 | spin_lock_init(&ifibss->incomplete_lock); | |
cd7760e6 SW |
1614 | INIT_WORK(&ifibss->csa_connection_drop_work, |
1615 | ieee80211_csa_connection_drop_work); | |
46900298 JB |
1616 | } |
1617 | ||
1618 | /* scan finished notification */ | |
1619 | void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) | |
1620 | { | |
af8cdcd8 | 1621 | struct ieee80211_sub_if_data *sdata; |
46900298 | 1622 | |
29b4a4f7 JB |
1623 | mutex_lock(&local->iflist_mtx); |
1624 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 1625 | if (!ieee80211_sdata_running(sdata)) |
0e41f715 | 1626 | continue; |
af8cdcd8 JB |
1627 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
1628 | continue; | |
1629 | sdata->u.ibss.last_scan_completed = jiffies; | |
7a17a33c | 1630 | ieee80211_queue_work(&local->hw, &sdata->work); |
46900298 | 1631 | } |
29b4a4f7 | 1632 | mutex_unlock(&local->iflist_mtx); |
46900298 JB |
1633 | } |
1634 | ||
af8cdcd8 JB |
1635 | int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, |
1636 | struct cfg80211_ibss_params *params) | |
1637 | { | |
ff3cc5f4 | 1638 | u32 changed = 0; |
2103dec1 SW |
1639 | u32 rate_flags; |
1640 | struct ieee80211_supported_band *sband; | |
71965c1d LC |
1641 | enum ieee80211_chanctx_mode chanmode; |
1642 | struct ieee80211_local *local = sdata->local; | |
1643 | int radar_detect_width = 0; | |
2103dec1 | 1644 | int i; |
71965c1d LC |
1645 | int ret; |
1646 | ||
1647 | ret = cfg80211_chandef_dfs_required(local->hw.wiphy, | |
1648 | ¶ms->chandef, | |
1649 | sdata->wdev.iftype); | |
1650 | if (ret < 0) | |
1651 | return ret; | |
1652 | ||
1653 | if (ret > 0) { | |
1654 | if (!params->userspace_handles_dfs) | |
1655 | return -EINVAL; | |
1656 | radar_detect_width = BIT(params->chandef.width); | |
1657 | } | |
1658 | ||
1659 | chanmode = (params->channel_fixed && !ret) ? | |
1660 | IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE; | |
1661 | ||
1662 | mutex_lock(&local->chanctx_mtx); | |
1663 | ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode, | |
1664 | radar_detect_width); | |
1665 | mutex_unlock(&local->chanctx_mtx); | |
1666 | if (ret < 0) | |
1667 | return ret; | |
af8cdcd8 | 1668 | |
af8cdcd8 JB |
1669 | if (params->bssid) { |
1670 | memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); | |
1671 | sdata->u.ibss.fixed_bssid = true; | |
1672 | } else | |
1673 | sdata->u.ibss.fixed_bssid = false; | |
1674 | ||
fffd0934 | 1675 | sdata->u.ibss.privacy = params->privacy; |
267335d6 | 1676 | sdata->u.ibss.control_port = params->control_port; |
8e8d347d | 1677 | sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs; |
fbd2c8dc | 1678 | sdata->u.ibss.basic_rates = params->basic_rates; |
c7d37a66 | 1679 | sdata->u.ibss.last_scan_completed = jiffies; |
2103dec1 SW |
1680 | |
1681 | /* fix basic_rates if channel does not support these rates */ | |
1682 | rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef); | |
71965c1d | 1683 | sband = local->hw.wiphy->bands[params->chandef.chan->band]; |
2103dec1 SW |
1684 | for (i = 0; i < sband->n_bitrates; i++) { |
1685 | if ((rate_flags & sband->bitrates[i].flags) != rate_flags) | |
1686 | sdata->u.ibss.basic_rates &= ~BIT(i); | |
1687 | } | |
dd5b4cc7 FF |
1688 | memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, |
1689 | sizeof(params->mcast_rate)); | |
fffd0934 | 1690 | |
57c4d7b4 JB |
1691 | sdata->vif.bss_conf.beacon_int = params->beacon_interval; |
1692 | ||
3aede78a | 1693 | sdata->u.ibss.chandef = params->chandef; |
af8cdcd8 JB |
1694 | sdata->u.ibss.fixed_channel = params->channel_fixed; |
1695 | ||
1696 | if (params->ie) { | |
1697 | sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, | |
1698 | GFP_KERNEL); | |
1699 | if (sdata->u.ibss.ie) | |
1700 | sdata->u.ibss.ie_len = params->ie_len; | |
1701 | } | |
1702 | ||
af8cdcd8 JB |
1703 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; |
1704 | sdata->u.ibss.ibss_join_req = jiffies; | |
1705 | ||
badecb00 | 1706 | memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); |
0e41f715 JB |
1707 | sdata->u.ibss.ssid_len = params->ssid_len; |
1708 | ||
822854b0 SW |
1709 | memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa, |
1710 | sizeof(sdata->u.ibss.ht_capa)); | |
1711 | memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask, | |
1712 | sizeof(sdata->u.ibss.ht_capa_mask)); | |
1713 | ||
ff3cc5f4 SW |
1714 | /* |
1715 | * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is | |
1716 | * reserved, but an HT STA shall protect HT transmissions as though | |
1717 | * the HT Protection field were set to non-HT mixed mode. | |
1718 | * | |
1719 | * In an IBSS, the RIFS Mode field of the HT Operation element is | |
1720 | * also reserved, but an HT STA shall operate as though this field | |
1721 | * were set to 1. | |
1722 | */ | |
1723 | ||
1724 | sdata->vif.bss_conf.ht_operation_mode |= | |
1725 | IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | |
1726 | | IEEE80211_HT_PARAM_RIFS_MODE; | |
1727 | ||
1728 | changed |= BSS_CHANGED_HT; | |
1729 | ieee80211_bss_info_change_notify(sdata, changed); | |
1730 | ||
04ecd257 | 1731 | sdata->smps_mode = IEEE80211_SMPS_OFF; |
71965c1d | 1732 | sdata->needed_rx_chains = local->rx_chains; |
04ecd257 | 1733 | |
71965c1d | 1734 | ieee80211_queue_work(&local->hw, &sdata->work); |
af8cdcd8 JB |
1735 | |
1736 | return 0; | |
1737 | } | |
1738 | ||
1739 | int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) | |
1740 | { | |
5ea096c0 | 1741 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
5ea096c0 | 1742 | |
871a4180 | 1743 | ieee80211_ibss_disconnect(sdata); |
b78a4932 | 1744 | ifibss->ssid_len = 0; |
871a4180 | 1745 | memset(ifibss->bssid, 0, ETH_ALEN); |
af8cdcd8 JB |
1746 | |
1747 | /* remove beacon */ | |
1748 | kfree(sdata->u.ibss.ie); | |
822854b0 SW |
1749 | |
1750 | /* on the next join, re-program HT parameters */ | |
1751 | memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa)); | |
1752 | memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask)); | |
1753 | ||
af8cdcd8 | 1754 | synchronize_rcu(); |
af8cdcd8 | 1755 | |
35f20c14 | 1756 | skb_queue_purge(&sdata->skb_queue); |
5cff20e6 | 1757 | |
bc05d19f | 1758 | del_timer_sync(&sdata->u.ibss.timer); |
7a17a33c | 1759 | |
af8cdcd8 JB |
1760 | return 0; |
1761 | } |