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> | |
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 | 148 | *pos++ = csa_settings->count; |
8df734e8 | 149 | presp->csa_current_counter = csa_settings->count; |
cd7760e6 SW |
150 | } |
151 | ||
2103dec1 SW |
152 | /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */ |
153 | if (rates_n > 8) { | |
46900298 | 154 | *pos++ = WLAN_EID_EXT_SUPP_RATES; |
2103dec1 SW |
155 | *pos++ = rates_n - 8; |
156 | for (; ri < sband->n_bitrates; ri++) { | |
157 | int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, | |
158 | 5 * (1 << shift)); | |
c3ffeab4 | 159 | u8 basic = 0; |
2103dec1 SW |
160 | if (!(rates & BIT(ri))) |
161 | continue; | |
162 | ||
163 | if (basic_rates & BIT(ri)) | |
c3ffeab4 | 164 | basic = 0x80; |
2103dec1 | 165 | *pos++ = basic | (u8) rate; |
c3ffeab4 | 166 | } |
46900298 JB |
167 | } |
168 | ||
c3ffeab4 JB |
169 | if (ifibss->ie_len) { |
170 | memcpy(pos, ifibss->ie, ifibss->ie_len); | |
171 | pos += ifibss->ie_len; | |
172 | } | |
af8cdcd8 | 173 | |
13c40c54 | 174 | /* add HT capability and information IEs */ |
d51b70ff SW |
175 | if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT && |
176 | chandef->width != NL80211_CHAN_WIDTH_5 && | |
177 | chandef->width != NL80211_CHAN_WIDTH_10 && | |
683b6d3b | 178 | sband->ht_cap.ht_supported) { |
822854b0 SW |
179 | struct ieee80211_sta_ht_cap ht_cap; |
180 | ||
181 | memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); | |
182 | ieee80211_apply_htcap_overrides(sdata, &ht_cap); | |
183 | ||
184 | pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); | |
0d894ec5 AN |
185 | /* |
186 | * Note: According to 802.11n-2009 9.13.3.1, HT Protection | |
187 | * field and RIFS Mode are reserved in IBSS mode, therefore | |
188 | * keep them at 0 | |
189 | */ | |
074d46d1 | 190 | pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap, |
d51b70ff | 191 | chandef, 0); |
abcff6ef JD |
192 | |
193 | /* add VHT capability and information IEs */ | |
194 | if (chandef->width != NL80211_CHAN_WIDTH_20 && | |
195 | chandef->width != NL80211_CHAN_WIDTH_40 && | |
196 | sband->vht_cap.vht_supported) { | |
197 | pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, | |
198 | sband->vht_cap.cap); | |
199 | pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap, | |
200 | chandef); | |
201 | } | |
13c40c54 AS |
202 | } |
203 | ||
40b861a0 AN |
204 | if (local->hw.queues >= IEEE80211_NUM_ACS) |
205 | pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */ | |
9eba6125 | 206 | |
c3ffeab4 JB |
207 | presp->head_len = pos - presp->head; |
208 | if (WARN_ON(presp->head_len > frame_len)) | |
d51b70ff SW |
209 | goto error; |
210 | ||
211 | return presp; | |
212 | error: | |
213 | kfree(presp); | |
214 | return NULL; | |
215 | } | |
216 | ||
217 | static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, | |
218 | const u8 *bssid, const int beacon_int, | |
b35c8097 | 219 | struct cfg80211_chan_def *req_chandef, |
d51b70ff SW |
220 | const u32 basic_rates, |
221 | const u16 capability, u64 tsf, | |
222 | bool creator) | |
223 | { | |
224 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
225 | struct ieee80211_local *local = sdata->local; | |
d51b70ff SW |
226 | struct ieee80211_mgmt *mgmt; |
227 | struct cfg80211_bss *bss; | |
228 | u32 bss_change; | |
229 | struct cfg80211_chan_def chandef; | |
b35c8097 | 230 | struct ieee80211_channel *chan; |
d51b70ff | 231 | struct beacon_data *presp; |
61f6bba0 | 232 | struct cfg80211_inform_bss bss_meta = {}; |
d51b70ff | 233 | bool have_higher_than_11mbit; |
2beb6dab | 234 | bool radar_required; |
55fff501 | 235 | int err; |
d51b70ff SW |
236 | |
237 | sdata_assert_lock(sdata); | |
238 | ||
239 | /* Reset own TSF to allow time synchronization work. */ | |
240 | drv_reset_tsf(local, sdata); | |
241 | ||
242 | if (!ether_addr_equal(ifibss->bssid, bssid)) | |
243 | sta_info_flush(sdata); | |
244 | ||
245 | /* if merging, indicate to driver that we leave the old IBSS */ | |
246 | if (sdata->vif.bss_conf.ibss_joined) { | |
247 | sdata->vif.bss_conf.ibss_joined = false; | |
248 | sdata->vif.bss_conf.ibss_creator = false; | |
249 | sdata->vif.bss_conf.enable_beacon = false; | |
250 | netif_carrier_off(sdata->dev); | |
251 | ieee80211_bss_info_change_notify(sdata, | |
252 | BSS_CHANGED_IBSS | | |
253 | BSS_CHANGED_BEACON_ENABLED); | |
55fff501 | 254 | drv_leave_ibss(local, sdata); |
d51b70ff SW |
255 | } |
256 | ||
257 | presp = rcu_dereference_protected(ifibss->presp, | |
258 | lockdep_is_held(&sdata->wdev.mtx)); | |
0c2bef46 | 259 | RCU_INIT_POINTER(ifibss->presp, NULL); |
d51b70ff SW |
260 | if (presp) |
261 | kfree_rcu(presp, rcu_head); | |
262 | ||
b35c8097 JL |
263 | /* make a copy of the chandef, it could be modified below. */ |
264 | chandef = *req_chandef; | |
265 | chan = chandef.chan; | |
174e0cd2 IP |
266 | if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef, |
267 | NL80211_IFTYPE_ADHOC)) { | |
d51b70ff SW |
268 | if (chandef.width == NL80211_CHAN_WIDTH_5 || |
269 | chandef.width == NL80211_CHAN_WIDTH_10 || | |
270 | chandef.width == NL80211_CHAN_WIDTH_20_NOHT || | |
271 | chandef.width == NL80211_CHAN_WIDTH_20) { | |
272 | sdata_info(sdata, | |
273 | "Failed to join IBSS, beacons forbidden\n"); | |
274 | return; | |
275 | } | |
276 | chandef.width = NL80211_CHAN_WIDTH_20; | |
277 | chandef.center_freq1 = chan->center_freq; | |
8e8d347d | 278 | /* check again for downgraded chandef */ |
174e0cd2 IP |
279 | if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef, |
280 | NL80211_IFTYPE_ADHOC)) { | |
8e8d347d SW |
281 | sdata_info(sdata, |
282 | "Failed to join IBSS, beacons forbidden\n"); | |
283 | return; | |
284 | } | |
285 | } | |
286 | ||
287 | err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, | |
2beb6dab | 288 | &chandef, NL80211_IFTYPE_ADHOC); |
6658ab80 LC |
289 | if (err < 0) { |
290 | sdata_info(sdata, | |
291 | "Failed to join IBSS, invalid chandef\n"); | |
292 | return; | |
293 | } | |
2beb6dab LC |
294 | if (err > 0 && !ifibss->userspace_handles_dfs) { |
295 | sdata_info(sdata, | |
296 | "Failed to join IBSS, DFS channel without control program\n"); | |
297 | return; | |
d51b70ff SW |
298 | } |
299 | ||
2beb6dab LC |
300 | radar_required = err; |
301 | ||
34a3740d | 302 | mutex_lock(&local->mtx); |
d51b70ff SW |
303 | if (ieee80211_vif_use_channel(sdata, &chandef, |
304 | ifibss->fixed_channel ? | |
305 | IEEE80211_CHANCTX_SHARED : | |
306 | IEEE80211_CHANCTX_EXCLUSIVE)) { | |
307 | sdata_info(sdata, "Failed to join IBSS, no channel context\n"); | |
34a3740d | 308 | mutex_unlock(&local->mtx); |
d51b70ff SW |
309 | return; |
310 | } | |
cc901de1 | 311 | sdata->radar_required = radar_required; |
34a3740d | 312 | mutex_unlock(&local->mtx); |
d51b70ff SW |
313 | |
314 | memcpy(ifibss->bssid, bssid, ETH_ALEN); | |
315 | ||
d51b70ff SW |
316 | presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates, |
317 | capability, tsf, &chandef, | |
cd7760e6 | 318 | &have_higher_than_11mbit, NULL); |
d51b70ff | 319 | if (!presp) |
c3ffeab4 JB |
320 | return; |
321 | ||
322 | rcu_assign_pointer(ifibss->presp, presp); | |
d51b70ff | 323 | mgmt = (void *)presp->head; |
46900298 | 324 | |
d6a83228 | 325 | sdata->vif.bss_conf.enable_beacon = true; |
2d0ddec5 | 326 | sdata->vif.bss_conf.beacon_int = beacon_int; |
fbd2c8dc | 327 | sdata->vif.bss_conf.basic_rates = basic_rates; |
0ca54f6c MP |
328 | sdata->vif.bss_conf.ssid_len = ifibss->ssid_len; |
329 | memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len); | |
2d0ddec5 JB |
330 | bss_change = BSS_CHANGED_BEACON_INT; |
331 | bss_change |= ieee80211_reset_erp_info(sdata); | |
332 | bss_change |= BSS_CHANGED_BSSID; | |
333 | bss_change |= BSS_CHANGED_BEACON; | |
334 | bss_change |= BSS_CHANGED_BEACON_ENABLED; | |
392cfdb1 | 335 | bss_change |= BSS_CHANGED_BASIC_RATES; |
13c40c54 | 336 | bss_change |= BSS_CHANGED_HT; |
8fc214ba | 337 | bss_change |= BSS_CHANGED_IBSS; |
0ca54f6c | 338 | bss_change |= BSS_CHANGED_SSID; |
2f91a967 SW |
339 | |
340 | /* | |
341 | * In 5 GHz/802.11a, we can always use short slot time. | |
342 | * (IEEE 802.11-2012 18.3.8.7) | |
343 | * | |
344 | * In 2.4GHz, we must always use long slots in IBSS for compatibility | |
345 | * reasons. | |
346 | * (IEEE 802.11-2012 19.4.5) | |
347 | * | |
348 | * HT follows these specifications (IEEE 802.11-2012 20.3.18) | |
349 | */ | |
350 | sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ; | |
351 | bss_change |= BSS_CHANGED_ERP_SLOT; | |
352 | ||
2ec9c1f6 SW |
353 | /* cf. IEEE 802.11 9.2.12 */ |
354 | if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit) | |
355 | sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; | |
356 | else | |
357 | sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; | |
358 | ||
55fff501 JB |
359 | ieee80211_set_wmm_default(sdata, true); |
360 | ||
8fc214ba | 361 | sdata->vif.bss_conf.ibss_joined = true; |
c13a765b | 362 | sdata->vif.bss_conf.ibss_creator = creator; |
46900298 | 363 | |
55fff501 JB |
364 | err = drv_join_ibss(local, sdata); |
365 | if (err) { | |
366 | sdata->vif.bss_conf.ibss_joined = false; | |
367 | sdata->vif.bss_conf.ibss_creator = false; | |
368 | sdata->vif.bss_conf.enable_beacon = false; | |
369 | sdata->vif.bss_conf.ssid_len = 0; | |
370 | RCU_INIT_POINTER(ifibss->presp, NULL); | |
371 | kfree_rcu(presp, rcu_head); | |
34a3740d | 372 | mutex_lock(&local->mtx); |
55fff501 | 373 | ieee80211_vif_release_channel(sdata); |
34a3740d | 374 | mutex_unlock(&local->mtx); |
55fff501 JB |
375 | sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n", |
376 | err); | |
377 | return; | |
378 | } | |
379 | ||
380 | ieee80211_bss_info_change_notify(sdata, bss_change); | |
46900298 | 381 | |
46900298 | 382 | ifibss->state = IEEE80211_IBSS_MLME_JOINED; |
af8cdcd8 JB |
383 | mod_timer(&ifibss->timer, |
384 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 | 385 | |
61f6bba0 JB |
386 | bss_meta.chan = chan; |
387 | bss_meta.scan_width = cfg80211_chandef_to_scan_width(&chandef); | |
388 | bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt, | |
389 | presp->head_len, GFP_KERNEL); | |
390 | ||
5b112d3d | 391 | cfg80211_put_bss(local->hw.wiphy, bss); |
86a2ea41 | 392 | netif_carrier_on(sdata->dev); |
fe94f3a4 | 393 | cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL); |
46900298 JB |
394 | } |
395 | ||
af8cdcd8 JB |
396 | static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
397 | struct ieee80211_bss *bss) | |
46900298 | 398 | { |
0c1ad2ca JB |
399 | struct cfg80211_bss *cbss = |
400 | container_of((void *)bss, struct cfg80211_bss, priv); | |
b59066a2 | 401 | struct ieee80211_supported_band *sband; |
75a423f4 | 402 | struct cfg80211_chan_def chandef; |
b59066a2 JB |
403 | u32 basic_rates; |
404 | int i, j; | |
0c1ad2ca | 405 | u16 beacon_int = cbss->beacon_interval; |
8cef2c9d | 406 | const struct cfg80211_bss_ies *ies; |
75a423f4 | 407 | enum nl80211_channel_type chan_type; |
8cef2c9d | 408 | u64 tsf; |
2103dec1 SW |
409 | u32 rate_flags; |
410 | int shift; | |
57c4d7b4 | 411 | |
8d61ffa5 | 412 | sdata_assert_lock(sdata); |
7a17a33c | 413 | |
57c4d7b4 JB |
414 | if (beacon_int < 10) |
415 | beacon_int = 10; | |
416 | ||
75a423f4 SW |
417 | switch (sdata->u.ibss.chandef.width) { |
418 | case NL80211_CHAN_WIDTH_20_NOHT: | |
419 | case NL80211_CHAN_WIDTH_20: | |
420 | case NL80211_CHAN_WIDTH_40: | |
421 | chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef); | |
422 | cfg80211_chandef_create(&chandef, cbss->channel, chan_type); | |
423 | break; | |
424 | case NL80211_CHAN_WIDTH_5: | |
425 | case NL80211_CHAN_WIDTH_10: | |
426 | cfg80211_chandef_create(&chandef, cbss->channel, | |
427 | NL80211_CHAN_WIDTH_20_NOHT); | |
428 | chandef.width = sdata->u.ibss.chandef.width; | |
429 | break; | |
abcff6ef JD |
430 | case NL80211_CHAN_WIDTH_80: |
431 | case NL80211_CHAN_WIDTH_160: | |
432 | chandef = sdata->u.ibss.chandef; | |
433 | chandef.chan = cbss->channel; | |
434 | break; | |
75a423f4 SW |
435 | default: |
436 | /* fall back to 20 MHz for unsupported modes */ | |
437 | cfg80211_chandef_create(&chandef, cbss->channel, | |
438 | NL80211_CHAN_WIDTH_20_NOHT); | |
439 | break; | |
440 | } | |
441 | ||
0c1ad2ca | 442 | sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; |
2103dec1 SW |
443 | rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef); |
444 | shift = ieee80211_vif_get_shift(&sdata->vif); | |
b59066a2 JB |
445 | |
446 | basic_rates = 0; | |
447 | ||
448 | for (i = 0; i < bss->supp_rates_len; i++) { | |
2103dec1 | 449 | int rate = bss->supp_rates[i] & 0x7f; |
b59066a2 JB |
450 | bool is_basic = !!(bss->supp_rates[i] & 0x80); |
451 | ||
452 | for (j = 0; j < sband->n_bitrates; j++) { | |
2103dec1 SW |
453 | int brate; |
454 | if ((rate_flags & sband->bitrates[j].flags) | |
455 | != rate_flags) | |
456 | continue; | |
457 | ||
458 | brate = DIV_ROUND_UP(sband->bitrates[j].bitrate, | |
459 | 5 * (1 << shift)); | |
460 | if (brate == rate) { | |
b59066a2 JB |
461 | if (is_basic) |
462 | basic_rates |= BIT(j); | |
463 | break; | |
464 | } | |
465 | } | |
466 | } | |
467 | ||
8cef2c9d JB |
468 | rcu_read_lock(); |
469 | ies = rcu_dereference(cbss->ies); | |
470 | tsf = ies->tsf; | |
471 | rcu_read_unlock(); | |
472 | ||
0c1ad2ca | 473 | __ieee80211_sta_join_ibss(sdata, cbss->bssid, |
57c4d7b4 | 474 | beacon_int, |
75a423f4 | 475 | &chandef, |
b59066a2 | 476 | basic_rates, |
0c1ad2ca | 477 | cbss->capability, |
8cef2c9d | 478 | tsf, false); |
46900298 JB |
479 | } |
480 | ||
cd7760e6 SW |
481 | int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata, |
482 | struct cfg80211_csa_settings *csa_settings) | |
483 | { | |
484 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
485 | struct beacon_data *presp, *old_presp; | |
486 | struct cfg80211_bss *cbss; | |
487 | const struct cfg80211_bss_ies *ies; | |
6eb18137 | 488 | u16 capability = 0; |
cd7760e6 SW |
489 | u64 tsf; |
490 | int ret = 0; | |
491 | ||
492 | sdata_assert_lock(sdata); | |
493 | ||
cd7760e6 | 494 | if (ifibss->privacy) |
6eb18137 | 495 | capability = WLAN_CAPABILITY_PRIVACY; |
cd7760e6 SW |
496 | |
497 | cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan, | |
498 | ifibss->bssid, ifibss->ssid, | |
6eb18137 DL |
499 | ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS, |
500 | IEEE80211_PRIVACY(ifibss->privacy)); | |
cd7760e6 SW |
501 | |
502 | if (WARN_ON(!cbss)) { | |
503 | ret = -EINVAL; | |
504 | goto out; | |
505 | } | |
506 | ||
507 | rcu_read_lock(); | |
508 | ies = rcu_dereference(cbss->ies); | |
509 | tsf = ies->tsf; | |
510 | rcu_read_unlock(); | |
511 | cfg80211_put_bss(sdata->local->hw.wiphy, cbss); | |
512 | ||
513 | old_presp = rcu_dereference_protected(ifibss->presp, | |
514 | lockdep_is_held(&sdata->wdev.mtx)); | |
515 | ||
516 | presp = ieee80211_ibss_build_presp(sdata, | |
517 | sdata->vif.bss_conf.beacon_int, | |
518 | sdata->vif.bss_conf.basic_rates, | |
519 | capability, tsf, &ifibss->chandef, | |
520 | NULL, csa_settings); | |
521 | if (!presp) { | |
522 | ret = -ENOMEM; | |
523 | goto out; | |
524 | } | |
525 | ||
526 | rcu_assign_pointer(ifibss->presp, presp); | |
527 | if (old_presp) | |
528 | kfree_rcu(old_presp, rcu_head); | |
529 | ||
dddd586b | 530 | return BSS_CHANGED_BEACON; |
cd7760e6 SW |
531 | out: |
532 | return ret; | |
533 | } | |
534 | ||
535 | int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata) | |
536 | { | |
537 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
538 | struct cfg80211_bss *cbss; | |
faf046e7 | 539 | int err, changed = 0; |
cd7760e6 | 540 | |
bafdc614 SW |
541 | sdata_assert_lock(sdata); |
542 | ||
cd7760e6 SW |
543 | /* update cfg80211 bss information with the new channel */ |
544 | if (!is_zero_ether_addr(ifibss->bssid)) { | |
cd7760e6 SW |
545 | cbss = cfg80211_get_bss(sdata->local->hw.wiphy, |
546 | ifibss->chandef.chan, | |
547 | ifibss->bssid, ifibss->ssid, | |
6eb18137 DL |
548 | ifibss->ssid_len, |
549 | IEEE80211_BSS_TYPE_IBSS, | |
550 | IEEE80211_PRIVACY(ifibss->privacy)); | |
cd7760e6 SW |
551 | /* XXX: should not really modify cfg80211 data */ |
552 | if (cbss) { | |
33787fc4 | 553 | cbss->channel = sdata->csa_chandef.chan; |
cd7760e6 SW |
554 | cfg80211_put_bss(sdata->local->hw.wiphy, cbss); |
555 | } | |
556 | } | |
557 | ||
33787fc4 | 558 | ifibss->chandef = sdata->csa_chandef; |
cd7760e6 SW |
559 | |
560 | /* generate the beacon */ | |
561 | err = ieee80211_ibss_csa_beacon(sdata, NULL); | |
cd7760e6 SW |
562 | if (err < 0) |
563 | return err; | |
564 | ||
faf046e7 | 565 | changed |= err; |
dddd586b | 566 | |
faf046e7 | 567 | return changed; |
cd7760e6 SW |
568 | } |
569 | ||
570 | void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata) | |
571 | { | |
572 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
573 | ||
574 | cancel_work_sync(&ifibss->csa_connection_drop_work); | |
575 | } | |
576 | ||
52874a5e | 577 | static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta) |
8bf11d8d JB |
578 | __acquires(RCU) |
579 | { | |
580 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
581 | u8 addr[ETH_ALEN]; | |
582 | ||
583 | memcpy(addr, sta->sta.addr, ETH_ALEN); | |
584 | ||
bdcbd8e0 | 585 | ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr); |
8bf11d8d | 586 | |
83d5cc01 JB |
587 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); |
588 | sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); | |
267335d6 AQ |
589 | /* authorize the station only if the network is not RSN protected. If |
590 | * not wait for the userspace to authorize it */ | |
591 | if (!sta->sdata->u.ibss.control_port) | |
592 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); | |
8bf11d8d JB |
593 | |
594 | rate_control_rate_init(sta); | |
595 | ||
596 | /* If it fails, maybe we raced another insertion? */ | |
597 | if (sta_info_insert_rcu(sta)) | |
598 | return sta_info_get(sdata, addr); | |
599 | return sta; | |
600 | } | |
601 | ||
602 | static struct sta_info * | |
52874a5e AQ |
603 | ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid, |
604 | const u8 *addr, u32 supp_rates) | |
8bf11d8d JB |
605 | __acquires(RCU) |
606 | { | |
607 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
608 | struct ieee80211_local *local = sdata->local; | |
609 | struct sta_info *sta; | |
55de908a | 610 | struct ieee80211_chanctx_conf *chanctx_conf; |
b422c6cd | 611 | struct ieee80211_supported_band *sband; |
74608aca | 612 | enum nl80211_bss_scan_width scan_width; |
55de908a | 613 | int band; |
8bf11d8d JB |
614 | |
615 | /* | |
616 | * XXX: Consider removing the least recently used entry and | |
617 | * allow new one to be added. | |
618 | */ | |
619 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { | |
bdcbd8e0 | 620 | net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
e87cc472 | 621 | sdata->name, addr); |
8bf11d8d JB |
622 | rcu_read_lock(); |
623 | return NULL; | |
624 | } | |
625 | ||
626 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { | |
627 | rcu_read_lock(); | |
628 | return NULL; | |
629 | } | |
630 | ||
b203ca39 | 631 | if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) { |
8bf11d8d JB |
632 | rcu_read_lock(); |
633 | return NULL; | |
634 | } | |
635 | ||
55de908a JB |
636 | rcu_read_lock(); |
637 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
638 | if (WARN_ON_ONCE(!chanctx_conf)) | |
639 | return NULL; | |
4bf88530 | 640 | band = chanctx_conf->def.chan->band; |
74608aca | 641 | scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); |
55de908a JB |
642 | rcu_read_unlock(); |
643 | ||
8bf11d8d JB |
644 | sta = sta_info_alloc(sdata, addr, GFP_KERNEL); |
645 | if (!sta) { | |
646 | rcu_read_lock(); | |
647 | return NULL; | |
648 | } | |
649 | ||
650 | sta->last_rx = jiffies; | |
651 | ||
652 | /* make sure mandatory rates are always added */ | |
b422c6cd | 653 | sband = local->hw.wiphy->bands[band]; |
8bf11d8d | 654 | sta->sta.supp_rates[band] = supp_rates | |
74608aca | 655 | ieee80211_mandatory_rates(sband, scan_width); |
8bf11d8d | 656 | |
52874a5e | 657 | return ieee80211_ibss_finish_sta(sta); |
6d810f10 AQ |
658 | } |
659 | ||
871a4180 SW |
660 | static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) |
661 | { | |
662 | struct ieee80211_local *local = sdata->local; | |
663 | int active = 0; | |
664 | struct sta_info *sta; | |
665 | ||
666 | sdata_assert_lock(sdata); | |
667 | ||
668 | rcu_read_lock(); | |
669 | ||
670 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
671 | if (sta->sdata == sdata && | |
672 | time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL, | |
673 | jiffies)) { | |
674 | active++; | |
675 | break; | |
676 | } | |
677 | } | |
678 | ||
679 | rcu_read_unlock(); | |
680 | ||
681 | return active; | |
682 | } | |
683 | ||
684 | static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata) | |
685 | { | |
686 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
687 | struct ieee80211_local *local = sdata->local; | |
688 | struct cfg80211_bss *cbss; | |
689 | struct beacon_data *presp; | |
690 | struct sta_info *sta; | |
871a4180 | 691 | |
d4c80d9d | 692 | if (!is_zero_ether_addr(ifibss->bssid)) { |
871a4180 SW |
693 | cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan, |
694 | ifibss->bssid, ifibss->ssid, | |
6eb18137 DL |
695 | ifibss->ssid_len, |
696 | IEEE80211_BSS_TYPE_IBSS, | |
697 | IEEE80211_PRIVACY(ifibss->privacy)); | |
871a4180 SW |
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 | ||
8a4988d1 JD |
983 | static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata, |
984 | struct ieee80211_mgmt *mgmt, size_t len, | |
985 | struct ieee80211_rx_status *rx_status, | |
986 | struct ieee802_11_elems *elems, | |
987 | struct ieee80211_channel *channel) | |
46900298 | 988 | { |
46900298 | 989 | struct sta_info *sta; |
46900298 | 990 | enum ieee80211_band band = rx_status->band; |
74608aca | 991 | enum nl80211_bss_scan_width scan_width; |
8a4988d1 | 992 | struct ieee80211_local *local = sdata->local; |
13c40c54 AS |
993 | struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; |
994 | bool rates_updated = false; | |
8a4988d1 | 995 | u32 supp_rates = 0; |
46900298 | 996 | |
8a4988d1 | 997 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
46900298 JB |
998 | return; |
999 | ||
8a4988d1 JD |
1000 | if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) |
1001 | return; | |
46900298 | 1002 | |
8a4988d1 JD |
1003 | rcu_read_lock(); |
1004 | sta = sta_info_get(sdata, mgmt->sa); | |
1005 | ||
1006 | if (elems->supp_rates) { | |
1007 | supp_rates = ieee80211_sta_get_rates(sdata, elems, | |
1008 | band, NULL); | |
1009 | if (sta) { | |
1010 | u32 prev_rates; | |
1011 | ||
1012 | prev_rates = sta->sta.supp_rates[band]; | |
1013 | /* make sure mandatory rates are always added */ | |
1014 | scan_width = NL80211_BSS_CHAN_WIDTH_20; | |
1015 | if (rx_status->flag & RX_FLAG_5MHZ) | |
1016 | scan_width = NL80211_BSS_CHAN_WIDTH_5; | |
1017 | if (rx_status->flag & RX_FLAG_10MHZ) | |
1018 | scan_width = NL80211_BSS_CHAN_WIDTH_10; | |
1019 | ||
1020 | sta->sta.supp_rates[band] = supp_rates | | |
1021 | ieee80211_mandatory_rates(sband, scan_width); | |
1022 | if (sta->sta.supp_rates[band] != prev_rates) { | |
1023 | ibss_dbg(sdata, | |
1024 | "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", | |
1025 | sta->sta.addr, prev_rates, | |
1026 | sta->sta.supp_rates[band]); | |
1027 | rates_updated = true; | |
8bf11d8d | 1028 | } |
8a4988d1 JD |
1029 | } else { |
1030 | rcu_read_unlock(); | |
1031 | sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, | |
1032 | mgmt->sa, supp_rates); | |
34e89507 | 1033 | } |
8a4988d1 | 1034 | } |
9eba6125 | 1035 | |
96a4688e JB |
1036 | if (sta && !sta->sta.wme && |
1037 | elems->wmm_info && local->hw.queues >= IEEE80211_NUM_ACS) { | |
8a4988d1 | 1038 | sta->sta.wme = true; |
96a4688e JB |
1039 | ieee80211_check_fast_xmit(sta); |
1040 | } | |
13c40c54 | 1041 | |
8a4988d1 JD |
1042 | if (sta && elems->ht_operation && elems->ht_cap_elem && |
1043 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT && | |
1044 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 && | |
1045 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) { | |
1046 | /* we both use HT */ | |
1047 | struct ieee80211_ht_cap htcap_ie; | |
1048 | struct cfg80211_chan_def chandef; | |
abcff6ef | 1049 | enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth; |
d2954457 | 1050 | |
8a4988d1 JD |
1051 | ieee80211_ht_oper_to_chandef(channel, |
1052 | elems->ht_operation, | |
1053 | &chandef); | |
d2954457 | 1054 | |
8a4988d1 | 1055 | memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie)); |
8a4988d1 JD |
1056 | rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, |
1057 | &htcap_ie, | |
1058 | sta); | |
abcff6ef JD |
1059 | |
1060 | if (elems->vht_operation && elems->vht_cap_elem && | |
1061 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 && | |
1062 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) { | |
1063 | /* we both use VHT */ | |
1064 | struct ieee80211_vht_cap cap_ie; | |
1065 | struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap; | |
1066 | ||
1067 | ieee80211_vht_oper_to_chandef(channel, | |
1068 | elems->vht_operation, | |
1069 | &chandef); | |
1070 | memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie)); | |
1071 | ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband, | |
1072 | &cap_ie, sta); | |
1073 | if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap))) | |
1074 | rates_updated |= true; | |
13c40c54 AS |
1075 | } |
1076 | ||
abcff6ef JD |
1077 | if (bw != sta->sta.bandwidth) |
1078 | rates_updated |= true; | |
d2954457 | 1079 | |
abcff6ef JD |
1080 | if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef, |
1081 | &chandef)) | |
1082 | WARN_ON_ONCE(1); | |
8a4988d1 | 1083 | } |
d2954457 | 1084 | |
8a4988d1 JD |
1085 | if (sta && rates_updated) { |
1086 | u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED; | |
1087 | u8 rx_nss = sta->sta.rx_nss; | |
13c40c54 | 1088 | |
8a4988d1 JD |
1089 | /* Force rx_nss recalculation */ |
1090 | sta->sta.rx_nss = 0; | |
1091 | rate_control_rate_init(sta); | |
1092 | if (sta->sta.rx_nss != rx_nss) | |
1093 | changed |= IEEE80211_RC_NSS_CHANGED; | |
13c40c54 | 1094 | |
8a4988d1 | 1095 | drv_sta_rc_update(local, sdata, &sta->sta, changed); |
46900298 JB |
1096 | } |
1097 | ||
8a4988d1 JD |
1098 | rcu_read_unlock(); |
1099 | } | |
1100 | ||
1101 | static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, | |
1102 | struct ieee80211_mgmt *mgmt, size_t len, | |
1103 | struct ieee80211_rx_status *rx_status, | |
1104 | struct ieee802_11_elems *elems) | |
1105 | { | |
1106 | struct ieee80211_local *local = sdata->local; | |
1107 | struct cfg80211_bss *cbss; | |
1108 | struct ieee80211_bss *bss; | |
1109 | struct ieee80211_channel *channel; | |
1110 | u64 beacon_timestamp, rx_timestamp; | |
1111 | u32 supp_rates = 0; | |
1112 | enum ieee80211_band band = rx_status->band; | |
1113 | ||
1114 | channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); | |
1115 | if (!channel) | |
1116 | return; | |
1117 | ||
1118 | ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel); | |
1119 | ||
46900298 | 1120 | bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, |
d45c4172 | 1121 | channel); |
46900298 JB |
1122 | if (!bss) |
1123 | return; | |
1124 | ||
0c1ad2ca JB |
1125 | cbss = container_of((void *)bss, struct cfg80211_bss, priv); |
1126 | ||
8cef2c9d JB |
1127 | /* same for beacon and probe response */ |
1128 | beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp); | |
46900298 JB |
1129 | |
1130 | /* check if we need to merge IBSS */ | |
1131 | ||
46900298 | 1132 | /* not an IBSS */ |
0c1ad2ca | 1133 | if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) |
46900298 JB |
1134 | goto put_bss; |
1135 | ||
1136 | /* different channel */ | |
55de908a | 1137 | if (sdata->u.ibss.fixed_channel && |
3aede78a | 1138 | sdata->u.ibss.chandef.chan != cbss->channel) |
46900298 JB |
1139 | goto put_bss; |
1140 | ||
1141 | /* different SSID */ | |
1142 | if (elems->ssid_len != sdata->u.ibss.ssid_len || | |
1143 | memcmp(elems->ssid, sdata->u.ibss.ssid, | |
1144 | sdata->u.ibss.ssid_len)) | |
1145 | goto put_bss; | |
1146 | ||
cd7760e6 | 1147 | /* process channel switch */ |
82a8e17d LC |
1148 | if (sdata->vif.csa_active || |
1149 | ieee80211_ibss_process_chanswitch(sdata, elems, true)) | |
cd7760e6 SW |
1150 | goto put_bss; |
1151 | ||
34e8f082 | 1152 | /* same BSSID */ |
b203ca39 | 1153 | if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) |
34e8f082 AF |
1154 | goto put_bss; |
1155 | ||
cd7760e6 SW |
1156 | /* we use a fixed BSSID */ |
1157 | if (sdata->u.ibss.fixed_bssid) | |
1158 | goto put_bss; | |
1159 | ||
f4bda337 TP |
1160 | if (ieee80211_have_rx_timestamp(rx_status)) { |
1161 | /* time when timestamp field was received */ | |
1162 | rx_timestamp = | |
1163 | ieee80211_calculate_rx_timestamp(local, rx_status, | |
1164 | len + FCS_LEN, 24); | |
24487981 JB |
1165 | } else { |
1166 | /* | |
1167 | * second best option: get current TSF | |
1168 | * (will return -1 if not supported) | |
1169 | */ | |
37a41b4a | 1170 | rx_timestamp = drv_get_tsf(local, sdata); |
24487981 | 1171 | } |
46900298 | 1172 | |
bdcbd8e0 JB |
1173 | ibss_dbg(sdata, |
1174 | "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", | |
1175 | mgmt->sa, mgmt->bssid, | |
1176 | (unsigned long long)rx_timestamp, | |
1177 | (unsigned long long)beacon_timestamp, | |
1178 | (unsigned long long)(rx_timestamp - beacon_timestamp), | |
1179 | jiffies); | |
46900298 JB |
1180 | |
1181 | if (beacon_timestamp > rx_timestamp) { | |
bdcbd8e0 JB |
1182 | ibss_dbg(sdata, |
1183 | "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", | |
1184 | mgmt->bssid); | |
46900298 | 1185 | ieee80211_sta_join_ibss(sdata, bss); |
2103dec1 | 1186 | supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL); |
34e89507 | 1187 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, |
52874a5e | 1188 | supp_rates); |
8bf11d8d | 1189 | rcu_read_unlock(); |
46900298 JB |
1190 | } |
1191 | ||
1192 | put_bss: | |
1193 | ieee80211_rx_bss_put(local, bss); | |
1194 | } | |
1195 | ||
8bf11d8d JB |
1196 | void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, |
1197 | const u8 *bssid, const u8 *addr, | |
1198 | u32 supp_rates) | |
46900298 | 1199 | { |
2e10d330 | 1200 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
46900298 JB |
1201 | struct ieee80211_local *local = sdata->local; |
1202 | struct sta_info *sta; | |
55de908a | 1203 | struct ieee80211_chanctx_conf *chanctx_conf; |
b422c6cd | 1204 | struct ieee80211_supported_band *sband; |
74608aca | 1205 | enum nl80211_bss_scan_width scan_width; |
55de908a | 1206 | int band; |
46900298 | 1207 | |
af8cdcd8 JB |
1208 | /* |
1209 | * XXX: Consider removing the least recently used entry and | |
1210 | * allow new one to be added. | |
1211 | */ | |
46900298 | 1212 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { |
bdcbd8e0 | 1213 | net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
e87cc472 | 1214 | sdata->name, addr); |
8bf11d8d | 1215 | return; |
46900298 JB |
1216 | } |
1217 | ||
2e10d330 | 1218 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) |
8bf11d8d | 1219 | return; |
2e10d330 | 1220 | |
b203ca39 | 1221 | if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) |
8bf11d8d | 1222 | return; |
46900298 | 1223 | |
55de908a JB |
1224 | rcu_read_lock(); |
1225 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
1226 | if (WARN_ON_ONCE(!chanctx_conf)) { | |
1227 | rcu_read_unlock(); | |
1228 | return; | |
1229 | } | |
4bf88530 | 1230 | band = chanctx_conf->def.chan->band; |
74608aca | 1231 | scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); |
55de908a JB |
1232 | rcu_read_unlock(); |
1233 | ||
8bf11d8d | 1234 | sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); |
46900298 | 1235 | if (!sta) |
8bf11d8d | 1236 | return; |
46900298 | 1237 | |
c8716d9d | 1238 | sta->last_rx = jiffies; |
d9a7ddb0 | 1239 | |
46900298 | 1240 | /* make sure mandatory rates are always added */ |
b422c6cd | 1241 | sband = local->hw.wiphy->bands[band]; |
46900298 | 1242 | sta->sta.supp_rates[band] = supp_rates | |
74608aca | 1243 | ieee80211_mandatory_rates(sband, scan_width); |
46900298 | 1244 | |
8bf11d8d JB |
1245 | spin_lock(&ifibss->incomplete_lock); |
1246 | list_add(&sta->list, &ifibss->incomplete_stations); | |
1247 | spin_unlock(&ifibss->incomplete_lock); | |
1248 | ieee80211_queue_work(&local->hw, &sdata->work); | |
46900298 JB |
1249 | } |
1250 | ||
dad9defd AQ |
1251 | static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata) |
1252 | { | |
1253 | struct ieee80211_local *local = sdata->local; | |
1254 | struct sta_info *sta, *tmp; | |
1255 | unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT; | |
1256 | unsigned long exp_rsn_time = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT; | |
1257 | ||
1258 | mutex_lock(&local->sta_mtx); | |
1259 | ||
1260 | list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { | |
1261 | if (sdata != sta->sdata) | |
1262 | continue; | |
1263 | ||
1264 | if (time_after(jiffies, sta->last_rx + exp_time) || | |
1265 | (time_after(jiffies, sta->last_rx + exp_rsn_time) && | |
1266 | sta->sta_state != IEEE80211_STA_AUTHORIZED)) { | |
1267 | sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n", | |
1268 | sta->sta_state != IEEE80211_STA_AUTHORIZED ? | |
1269 | "not authorized " : "", sta->sta.addr); | |
1270 | ||
1271 | WARN_ON(__sta_info_destroy(sta)); | |
1272 | } | |
1273 | } | |
1274 | ||
1275 | mutex_unlock(&local->sta_mtx); | |
1276 | } | |
1277 | ||
ce9058ae BP |
1278 | /* |
1279 | * This function is called with state == IEEE80211_IBSS_MLME_JOINED | |
1280 | */ | |
46900298 JB |
1281 | |
1282 | static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) | |
1283 | { | |
1284 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
7ca15a0a | 1285 | enum nl80211_bss_scan_width scan_width; |
46900298 | 1286 | |
8d61ffa5 | 1287 | sdata_assert_lock(sdata); |
7a17a33c | 1288 | |
af8cdcd8 JB |
1289 | mod_timer(&ifibss->timer, |
1290 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 | 1291 | |
dad9defd | 1292 | ieee80211_ibss_sta_expire(sdata); |
af8cdcd8 | 1293 | |
450aae3d S |
1294 | if (time_before(jiffies, ifibss->last_scan_completed + |
1295 | IEEE80211_IBSS_MERGE_INTERVAL)) | |
1296 | return; | |
1297 | ||
46900298 JB |
1298 | if (ieee80211_sta_active_ibss(sdata)) |
1299 | return; | |
1300 | ||
c037b836 | 1301 | if (ifibss->fixed_channel) |
46900298 JB |
1302 | return; |
1303 | ||
bdcbd8e0 JB |
1304 | sdata_info(sdata, |
1305 | "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); | |
46900298 | 1306 | |
7ca15a0a | 1307 | scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); |
34bcf715 | 1308 | ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len, |
76bed0f4 | 1309 | NULL, 0, scan_width); |
46900298 JB |
1310 | } |
1311 | ||
af8cdcd8 | 1312 | static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
1313 | { |
1314 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
46900298 | 1315 | u8 bssid[ETH_ALEN]; |
46900298 JB |
1316 | u16 capability; |
1317 | int i; | |
1318 | ||
8d61ffa5 | 1319 | sdata_assert_lock(sdata); |
7a17a33c | 1320 | |
af8cdcd8 | 1321 | if (ifibss->fixed_bssid) { |
46900298 JB |
1322 | memcpy(bssid, ifibss->bssid, ETH_ALEN); |
1323 | } else { | |
1324 | /* Generate random, not broadcast, locally administered BSSID. Mix in | |
1325 | * own MAC address to make sure that devices that do not have proper | |
1326 | * random number generator get different BSSID. */ | |
1327 | get_random_bytes(bssid, ETH_ALEN); | |
1328 | for (i = 0; i < ETH_ALEN; i++) | |
47846c9b | 1329 | bssid[i] ^= sdata->vif.addr[i]; |
46900298 JB |
1330 | bssid[0] &= ~0x01; |
1331 | bssid[0] |= 0x02; | |
1332 | } | |
1333 | ||
bdcbd8e0 | 1334 | sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); |
46900298 | 1335 | |
46900298 JB |
1336 | capability = WLAN_CAPABILITY_IBSS; |
1337 | ||
fffd0934 | 1338 | if (ifibss->privacy) |
46900298 | 1339 | capability |= WLAN_CAPABILITY_PRIVACY; |
46900298 | 1340 | |
57c4d7b4 | 1341 | __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, |
75a423f4 | 1342 | &ifibss->chandef, ifibss->basic_rates, |
c13a765b | 1343 | capability, 0, true); |
46900298 JB |
1344 | } |
1345 | ||
76bed0f4 JD |
1346 | static unsigned ibss_setup_channels(struct wiphy *wiphy, |
1347 | struct ieee80211_channel **channels, | |
1348 | unsigned int channels_max, | |
1349 | u32 center_freq, u32 width) | |
1350 | { | |
1351 | struct ieee80211_channel *chan = NULL; | |
1352 | unsigned int n_chan = 0; | |
1353 | u32 start_freq, end_freq, freq; | |
1354 | ||
1355 | if (width <= 20) { | |
1356 | start_freq = center_freq; | |
1357 | end_freq = center_freq; | |
1358 | } else { | |
1359 | start_freq = center_freq - width / 2 + 10; | |
1360 | end_freq = center_freq + width / 2 - 10; | |
1361 | } | |
1362 | ||
1363 | for (freq = start_freq; freq <= end_freq; freq += 20) { | |
1364 | chan = ieee80211_get_channel(wiphy, freq); | |
1365 | if (!chan) | |
1366 | continue; | |
1367 | if (n_chan >= channels_max) | |
1368 | return n_chan; | |
1369 | ||
1370 | channels[n_chan] = chan; | |
1371 | n_chan++; | |
1372 | } | |
1373 | ||
1374 | return n_chan; | |
1375 | } | |
1376 | ||
1377 | static unsigned int | |
1378 | ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy, | |
1379 | const struct cfg80211_chan_def *chandef, | |
1380 | struct ieee80211_channel **channels, | |
1381 | unsigned int channels_max) | |
1382 | { | |
1383 | unsigned int n_chan = 0; | |
1384 | u32 width, cf1, cf2 = 0; | |
1385 | ||
1386 | switch (chandef->width) { | |
1387 | case NL80211_CHAN_WIDTH_40: | |
1388 | width = 40; | |
1389 | break; | |
1390 | case NL80211_CHAN_WIDTH_80P80: | |
1391 | cf2 = chandef->center_freq2; | |
1392 | /* fall through */ | |
1393 | case NL80211_CHAN_WIDTH_80: | |
1394 | width = 80; | |
1395 | break; | |
1396 | case NL80211_CHAN_WIDTH_160: | |
1397 | width = 160; | |
1398 | break; | |
1399 | default: | |
1400 | width = 20; | |
1401 | break; | |
1402 | } | |
1403 | ||
1404 | cf1 = chandef->center_freq1; | |
1405 | ||
1406 | n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width); | |
1407 | ||
1408 | if (cf2) | |
1409 | n_chan += ibss_setup_channels(wiphy, &channels[n_chan], | |
1410 | channels_max - n_chan, cf2, | |
1411 | width); | |
1412 | ||
1413 | return n_chan; | |
1414 | } | |
1415 | ||
ce9058ae BP |
1416 | /* |
1417 | * This function is called with state == IEEE80211_IBSS_MLME_SEARCH | |
1418 | */ | |
1419 | ||
af8cdcd8 | 1420 | static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
1421 | { |
1422 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1423 | struct ieee80211_local *local = sdata->local; | |
0c1ad2ca | 1424 | struct cfg80211_bss *cbss; |
af8cdcd8 | 1425 | struct ieee80211_channel *chan = NULL; |
46900298 | 1426 | const u8 *bssid = NULL; |
7ca15a0a | 1427 | enum nl80211_bss_scan_width scan_width; |
46900298 JB |
1428 | int active_ibss; |
1429 | ||
8d61ffa5 | 1430 | sdata_assert_lock(sdata); |
7a17a33c | 1431 | |
46900298 | 1432 | active_ibss = ieee80211_sta_active_ibss(sdata); |
bdcbd8e0 | 1433 | ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); |
46900298 JB |
1434 | |
1435 | if (active_ibss) | |
af8cdcd8 | 1436 | return; |
46900298 | 1437 | |
af8cdcd8 JB |
1438 | if (ifibss->fixed_bssid) |
1439 | bssid = ifibss->bssid; | |
1440 | if (ifibss->fixed_channel) | |
3aede78a | 1441 | chan = ifibss->chandef.chan; |
af8cdcd8 | 1442 | if (!is_zero_ether_addr(ifibss->bssid)) |
46900298 | 1443 | bssid = ifibss->bssid; |
0c1ad2ca JB |
1444 | cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, |
1445 | ifibss->ssid, ifibss->ssid_len, | |
6eb18137 DL |
1446 | IEEE80211_BSS_TYPE_IBSS, |
1447 | IEEE80211_PRIVACY(ifibss->privacy)); | |
0c1ad2ca JB |
1448 | |
1449 | if (cbss) { | |
1450 | struct ieee80211_bss *bss; | |
46900298 | 1451 | |
0c1ad2ca | 1452 | bss = (void *)cbss->priv; |
bdcbd8e0 JB |
1453 | ibss_dbg(sdata, |
1454 | "sta_find_ibss: selected %pM current %pM\n", | |
1455 | cbss->bssid, ifibss->bssid); | |
1456 | sdata_info(sdata, | |
1457 | "Selected IBSS BSSID %pM based on configured SSID\n", | |
1458 | cbss->bssid); | |
46900298 | 1459 | |
af8cdcd8 | 1460 | ieee80211_sta_join_ibss(sdata, bss); |
46900298 | 1461 | ieee80211_rx_bss_put(local, bss); |
af8cdcd8 | 1462 | return; |
d419b9f0 | 1463 | } |
46900298 | 1464 | |
d8eb741e AQ |
1465 | /* if a fixed bssid and a fixed freq have been provided create the IBSS |
1466 | * directly and do not waste time scanning | |
1467 | */ | |
1468 | if (ifibss->fixed_bssid && ifibss->fixed_channel) { | |
1469 | sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n", | |
1470 | bssid); | |
1471 | ieee80211_sta_create_ibss(sdata); | |
1472 | return; | |
1473 | } | |
1474 | ||
1475 | ||
bdcbd8e0 | 1476 | ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); |
46900298 JB |
1477 | |
1478 | /* Selected IBSS not found in current scan results - try to scan */ | |
ce9058ae | 1479 | if (time_after(jiffies, ifibss->last_scan_completed + |
46900298 | 1480 | IEEE80211_SCAN_INTERVAL)) { |
76bed0f4 JD |
1481 | struct ieee80211_channel *channels[8]; |
1482 | unsigned int num; | |
1483 | ||
bdcbd8e0 | 1484 | sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); |
46900298 | 1485 | |
76bed0f4 JD |
1486 | num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy, |
1487 | &ifibss->chandef, | |
1488 | channels, | |
1489 | ARRAY_SIZE(channels)); | |
7ca15a0a | 1490 | scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); |
34bcf715 | 1491 | ieee80211_request_ibss_scan(sdata, ifibss->ssid, |
76bed0f4 | 1492 | ifibss->ssid_len, channels, num, |
7ca15a0a | 1493 | scan_width); |
ce9058ae | 1494 | } else { |
46900298 JB |
1495 | int interval = IEEE80211_SCAN_INTERVAL; |
1496 | ||
1497 | if (time_after(jiffies, ifibss->ibss_join_req + | |
55de908a JB |
1498 | IEEE80211_IBSS_JOIN_TIMEOUT)) |
1499 | ieee80211_sta_create_ibss(sdata); | |
46900298 | 1500 | |
af8cdcd8 JB |
1501 | mod_timer(&ifibss->timer, |
1502 | round_jiffies(jiffies + interval)); | |
46900298 | 1503 | } |
46900298 JB |
1504 | } |
1505 | ||
1506 | static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, | |
c269a203 | 1507 | struct sk_buff *req) |
46900298 | 1508 | { |
c269a203 | 1509 | struct ieee80211_mgmt *mgmt = (void *)req->data; |
46900298 JB |
1510 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
1511 | struct ieee80211_local *local = sdata->local; | |
c269a203 | 1512 | int tx_last_beacon, len = req->len; |
46900298 | 1513 | struct sk_buff *skb; |
c3ffeab4 | 1514 | struct beacon_data *presp; |
46900298 JB |
1515 | u8 *pos, *end; |
1516 | ||
8d61ffa5 | 1517 | sdata_assert_lock(sdata); |
7a17a33c | 1518 | |
40b275b6 | 1519 | presp = rcu_dereference_protected(ifibss->presp, |
8d61ffa5 | 1520 | lockdep_is_held(&sdata->wdev.mtx)); |
40b275b6 | 1521 | |
46900298 | 1522 | if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || |
40b275b6 | 1523 | len < 24 + 2 || !presp) |
46900298 JB |
1524 | return; |
1525 | ||
24487981 | 1526 | tx_last_beacon = drv_tx_last_beacon(local); |
46900298 | 1527 | |
bdcbd8e0 JB |
1528 | ibss_dbg(sdata, |
1529 | "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n", | |
1530 | mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon); | |
46900298 | 1531 | |
1ed76487 | 1532 | if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) |
46900298 JB |
1533 | return; |
1534 | ||
b203ca39 | 1535 | if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && |
888d04df | 1536 | !is_broadcast_ether_addr(mgmt->bssid)) |
46900298 JB |
1537 | return; |
1538 | ||
1539 | end = ((u8 *) mgmt) + len; | |
1540 | pos = mgmt->u.probe_req.variable; | |
1541 | if (pos[0] != WLAN_EID_SSID || | |
1542 | pos + 2 + pos[1] > end) { | |
bdcbd8e0 JB |
1543 | ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", |
1544 | mgmt->sa); | |
46900298 JB |
1545 | return; |
1546 | } | |
1547 | if (pos[1] != 0 && | |
1548 | (pos[1] != ifibss->ssid_len || | |
0da780c2 | 1549 | memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { |
46900298 JB |
1550 | /* Ignore ProbeReq for foreign SSID */ |
1551 | return; | |
1552 | } | |
1553 | ||
1554 | /* Reply with ProbeResp */ | |
c3ffeab4 | 1555 | skb = dev_alloc_skb(local->tx_headroom + presp->head_len); |
46900298 JB |
1556 | if (!skb) |
1557 | return; | |
1558 | ||
c3ffeab4 JB |
1559 | skb_reserve(skb, local->tx_headroom); |
1560 | memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len); | |
1561 | ||
1562 | memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN); | |
1563 | ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa); | |
62ae67be | 1564 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
691eb61b SW |
1565 | |
1566 | /* avoid excessive retries for probe request to wildcard SSIDs */ | |
1567 | if (pos[1] == 0) | |
1568 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK; | |
1569 | ||
62ae67be | 1570 | ieee80211_tx_skb(sdata, skb); |
46900298 JB |
1571 | } |
1572 | ||
d45c4172 EG |
1573 | static |
1574 | void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata, | |
1575 | struct ieee80211_mgmt *mgmt, size_t len, | |
1576 | struct ieee80211_rx_status *rx_status) | |
46900298 JB |
1577 | { |
1578 | size_t baselen; | |
1579 | struct ieee802_11_elems elems; | |
1580 | ||
d45c4172 EG |
1581 | BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) != |
1582 | offsetof(typeof(mgmt->u.beacon), variable)); | |
1583 | ||
1584 | /* | |
1585 | * either beacon or probe_resp but the variable field is at the | |
1586 | * same offset | |
1587 | */ | |
46900298 JB |
1588 | baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; |
1589 | if (baselen > len) | |
1590 | return; | |
1591 | ||
1592 | ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, | |
b2e506bf | 1593 | false, &elems); |
46900298 | 1594 | |
d45c4172 | 1595 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); |
46900298 JB |
1596 | } |
1597 | ||
1fa57d01 JB |
1598 | void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, |
1599 | struct sk_buff *skb) | |
46900298 JB |
1600 | { |
1601 | struct ieee80211_rx_status *rx_status; | |
1602 | struct ieee80211_mgmt *mgmt; | |
1603 | u16 fc; | |
cd7760e6 SW |
1604 | struct ieee802_11_elems elems; |
1605 | int ies_len; | |
46900298 | 1606 | |
f1d58c25 | 1607 | rx_status = IEEE80211_SKB_RXCB(skb); |
46900298 JB |
1608 | mgmt = (struct ieee80211_mgmt *) skb->data; |
1609 | fc = le16_to_cpu(mgmt->frame_control); | |
1610 | ||
8d61ffa5 | 1611 | sdata_lock(sdata); |
7a17a33c | 1612 | |
c926d006 TH |
1613 | if (!sdata->u.ibss.ssid_len) |
1614 | goto mgmt_out; /* not ready to merge yet */ | |
1615 | ||
46900298 JB |
1616 | switch (fc & IEEE80211_FCTL_STYPE) { |
1617 | case IEEE80211_STYPE_PROBE_REQ: | |
c269a203 | 1618 | ieee80211_rx_mgmt_probe_req(sdata, skb); |
46900298 JB |
1619 | break; |
1620 | case IEEE80211_STYPE_PROBE_RESP: | |
46900298 | 1621 | case IEEE80211_STYPE_BEACON: |
d45c4172 EG |
1622 | ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len, |
1623 | rx_status); | |
46900298 JB |
1624 | break; |
1625 | case IEEE80211_STYPE_AUTH: | |
1626 | ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); | |
1627 | break; | |
2cc59e78 AQ |
1628 | case IEEE80211_STYPE_DEAUTH: |
1629 | ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); | |
1630 | break; | |
cd7760e6 SW |
1631 | case IEEE80211_STYPE_ACTION: |
1632 | switch (mgmt->u.action.category) { | |
1633 | case WLAN_CATEGORY_SPECTRUM_MGMT: | |
1634 | ies_len = skb->len - | |
1635 | offsetof(struct ieee80211_mgmt, | |
1636 | u.action.u.chan_switch.variable); | |
1637 | ||
1638 | if (ies_len < 0) | |
1639 | break; | |
1640 | ||
1641 | ieee802_11_parse_elems( | |
1642 | mgmt->u.action.u.chan_switch.variable, | |
1643 | ies_len, true, &elems); | |
1644 | ||
1645 | if (elems.parse_error) | |
1646 | break; | |
1647 | ||
1648 | ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len, | |
1649 | rx_status, &elems); | |
1650 | break; | |
1651 | } | |
46900298 | 1652 | } |
7a17a33c | 1653 | |
c926d006 | 1654 | mgmt_out: |
8d61ffa5 | 1655 | sdata_unlock(sdata); |
46900298 JB |
1656 | } |
1657 | ||
1fa57d01 | 1658 | void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) |
46900298 | 1659 | { |
1fa57d01 | 1660 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
8bf11d8d | 1661 | struct sta_info *sta; |
46900298 | 1662 | |
8d61ffa5 | 1663 | sdata_lock(sdata); |
7a17a33c JB |
1664 | |
1665 | /* | |
1666 | * Work could be scheduled after scan or similar | |
1667 | * when we aren't even joined (or trying) with a | |
1668 | * network. | |
1669 | */ | |
1670 | if (!ifibss->ssid_len) | |
1671 | goto out; | |
46900298 | 1672 | |
8bf11d8d JB |
1673 | spin_lock_bh(&ifibss->incomplete_lock); |
1674 | while (!list_empty(&ifibss->incomplete_stations)) { | |
1675 | sta = list_first_entry(&ifibss->incomplete_stations, | |
1676 | struct sta_info, list); | |
1677 | list_del(&sta->list); | |
1678 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1679 | ||
52874a5e | 1680 | ieee80211_ibss_finish_sta(sta); |
8bf11d8d JB |
1681 | rcu_read_unlock(); |
1682 | spin_lock_bh(&ifibss->incomplete_lock); | |
1683 | } | |
1684 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1685 | ||
46900298 JB |
1686 | switch (ifibss->state) { |
1687 | case IEEE80211_IBSS_MLME_SEARCH: | |
1688 | ieee80211_sta_find_ibss(sdata); | |
1689 | break; | |
1690 | case IEEE80211_IBSS_MLME_JOINED: | |
1691 | ieee80211_sta_merge_ibss(sdata); | |
1692 | break; | |
1693 | default: | |
1694 | WARN_ON(1); | |
1695 | break; | |
1696 | } | |
46900298 | 1697 | |
7a17a33c | 1698 | out: |
8d61ffa5 | 1699 | sdata_unlock(sdata); |
3a4d4aa2 JB |
1700 | } |
1701 | ||
46900298 JB |
1702 | static void ieee80211_ibss_timer(unsigned long data) |
1703 | { | |
1704 | struct ieee80211_sub_if_data *sdata = | |
1705 | (struct ieee80211_sub_if_data *) data; | |
5bb644a0 | 1706 | |
a6182943 | 1707 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
5bb644a0 | 1708 | } |
5bb644a0 | 1709 | |
46900298 JB |
1710 | void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) |
1711 | { | |
1712 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1713 | ||
46900298 JB |
1714 | setup_timer(&ifibss->timer, ieee80211_ibss_timer, |
1715 | (unsigned long) sdata); | |
8bf11d8d JB |
1716 | INIT_LIST_HEAD(&ifibss->incomplete_stations); |
1717 | spin_lock_init(&ifibss->incomplete_lock); | |
cd7760e6 SW |
1718 | INIT_WORK(&ifibss->csa_connection_drop_work, |
1719 | ieee80211_csa_connection_drop_work); | |
46900298 JB |
1720 | } |
1721 | ||
1722 | /* scan finished notification */ | |
1723 | void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) | |
1724 | { | |
af8cdcd8 | 1725 | struct ieee80211_sub_if_data *sdata; |
46900298 | 1726 | |
29b4a4f7 JB |
1727 | mutex_lock(&local->iflist_mtx); |
1728 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 1729 | if (!ieee80211_sdata_running(sdata)) |
0e41f715 | 1730 | continue; |
af8cdcd8 JB |
1731 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
1732 | continue; | |
1733 | sdata->u.ibss.last_scan_completed = jiffies; | |
7a17a33c | 1734 | ieee80211_queue_work(&local->hw, &sdata->work); |
46900298 | 1735 | } |
29b4a4f7 | 1736 | mutex_unlock(&local->iflist_mtx); |
46900298 JB |
1737 | } |
1738 | ||
af8cdcd8 JB |
1739 | int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, |
1740 | struct cfg80211_ibss_params *params) | |
1741 | { | |
ff3cc5f4 | 1742 | u32 changed = 0; |
2103dec1 SW |
1743 | u32 rate_flags; |
1744 | struct ieee80211_supported_band *sband; | |
71965c1d LC |
1745 | enum ieee80211_chanctx_mode chanmode; |
1746 | struct ieee80211_local *local = sdata->local; | |
1747 | int radar_detect_width = 0; | |
2103dec1 | 1748 | int i; |
71965c1d LC |
1749 | int ret; |
1750 | ||
1751 | ret = cfg80211_chandef_dfs_required(local->hw.wiphy, | |
1752 | ¶ms->chandef, | |
1753 | sdata->wdev.iftype); | |
1754 | if (ret < 0) | |
1755 | return ret; | |
1756 | ||
1757 | if (ret > 0) { | |
1758 | if (!params->userspace_handles_dfs) | |
1759 | return -EINVAL; | |
1760 | radar_detect_width = BIT(params->chandef.width); | |
1761 | } | |
1762 | ||
1763 | chanmode = (params->channel_fixed && !ret) ? | |
1764 | IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE; | |
1765 | ||
1766 | mutex_lock(&local->chanctx_mtx); | |
1767 | ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode, | |
1768 | radar_detect_width); | |
1769 | mutex_unlock(&local->chanctx_mtx); | |
1770 | if (ret < 0) | |
1771 | return ret; | |
af8cdcd8 | 1772 | |
af8cdcd8 JB |
1773 | if (params->bssid) { |
1774 | memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); | |
1775 | sdata->u.ibss.fixed_bssid = true; | |
1776 | } else | |
1777 | sdata->u.ibss.fixed_bssid = false; | |
1778 | ||
fffd0934 | 1779 | sdata->u.ibss.privacy = params->privacy; |
267335d6 | 1780 | sdata->u.ibss.control_port = params->control_port; |
8e8d347d | 1781 | sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs; |
fbd2c8dc | 1782 | sdata->u.ibss.basic_rates = params->basic_rates; |
c7d37a66 | 1783 | sdata->u.ibss.last_scan_completed = jiffies; |
2103dec1 SW |
1784 | |
1785 | /* fix basic_rates if channel does not support these rates */ | |
1786 | rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef); | |
71965c1d | 1787 | sband = local->hw.wiphy->bands[params->chandef.chan->band]; |
2103dec1 SW |
1788 | for (i = 0; i < sband->n_bitrates; i++) { |
1789 | if ((rate_flags & sband->bitrates[i].flags) != rate_flags) | |
1790 | sdata->u.ibss.basic_rates &= ~BIT(i); | |
1791 | } | |
dd5b4cc7 FF |
1792 | memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, |
1793 | sizeof(params->mcast_rate)); | |
fffd0934 | 1794 | |
57c4d7b4 JB |
1795 | sdata->vif.bss_conf.beacon_int = params->beacon_interval; |
1796 | ||
3aede78a | 1797 | sdata->u.ibss.chandef = params->chandef; |
af8cdcd8 JB |
1798 | sdata->u.ibss.fixed_channel = params->channel_fixed; |
1799 | ||
1800 | if (params->ie) { | |
1801 | sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, | |
1802 | GFP_KERNEL); | |
1803 | if (sdata->u.ibss.ie) | |
1804 | sdata->u.ibss.ie_len = params->ie_len; | |
1805 | } | |
1806 | ||
af8cdcd8 JB |
1807 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; |
1808 | sdata->u.ibss.ibss_join_req = jiffies; | |
1809 | ||
badecb00 | 1810 | memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); |
0e41f715 JB |
1811 | sdata->u.ibss.ssid_len = params->ssid_len; |
1812 | ||
822854b0 SW |
1813 | memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa, |
1814 | sizeof(sdata->u.ibss.ht_capa)); | |
1815 | memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask, | |
1816 | sizeof(sdata->u.ibss.ht_capa_mask)); | |
1817 | ||
ff3cc5f4 SW |
1818 | /* |
1819 | * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is | |
1820 | * reserved, but an HT STA shall protect HT transmissions as though | |
1821 | * the HT Protection field were set to non-HT mixed mode. | |
1822 | * | |
1823 | * In an IBSS, the RIFS Mode field of the HT Operation element is | |
1824 | * also reserved, but an HT STA shall operate as though this field | |
1825 | * were set to 1. | |
1826 | */ | |
1827 | ||
1828 | sdata->vif.bss_conf.ht_operation_mode |= | |
1829 | IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | |
1830 | | IEEE80211_HT_PARAM_RIFS_MODE; | |
1831 | ||
1832 | changed |= BSS_CHANGED_HT; | |
1833 | ieee80211_bss_info_change_notify(sdata, changed); | |
1834 | ||
04ecd257 | 1835 | sdata->smps_mode = IEEE80211_SMPS_OFF; |
71965c1d | 1836 | sdata->needed_rx_chains = local->rx_chains; |
04ecd257 | 1837 | |
71965c1d | 1838 | ieee80211_queue_work(&local->hw, &sdata->work); |
af8cdcd8 JB |
1839 | |
1840 | return 0; | |
1841 | } | |
1842 | ||
1843 | int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) | |
1844 | { | |
5ea096c0 | 1845 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
5ea096c0 | 1846 | |
871a4180 | 1847 | ieee80211_ibss_disconnect(sdata); |
b78a4932 | 1848 | ifibss->ssid_len = 0; |
c84a67a2 | 1849 | eth_zero_addr(ifibss->bssid); |
af8cdcd8 JB |
1850 | |
1851 | /* remove beacon */ | |
1852 | kfree(sdata->u.ibss.ie); | |
822854b0 SW |
1853 | |
1854 | /* on the next join, re-program HT parameters */ | |
1855 | memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa)); | |
1856 | memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask)); | |
1857 | ||
af8cdcd8 | 1858 | synchronize_rcu(); |
af8cdcd8 | 1859 | |
35f20c14 | 1860 | skb_queue_purge(&sdata->skb_queue); |
5cff20e6 | 1861 | |
bc05d19f | 1862 | del_timer_sync(&sdata->u.ibss.timer); |
7a17a33c | 1863 | |
af8cdcd8 JB |
1864 | return 0; |
1865 | } |