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 SW |
231 | struct beacon_data *presp; |
232 | enum nl80211_bss_scan_width scan_width; | |
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 | |
7ca15a0a SW |
386 | scan_width = cfg80211_chandef_to_scan_width(&chandef); |
387 | bss = cfg80211_inform_bss_width_frame(local->hw.wiphy, chan, | |
388 | scan_width, mgmt, | |
389 | presp->head_len, 0, GFP_KERNEL); | |
5b112d3d | 390 | cfg80211_put_bss(local->hw.wiphy, bss); |
86a2ea41 | 391 | netif_carrier_on(sdata->dev); |
fe94f3a4 | 392 | cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL); |
46900298 JB |
393 | } |
394 | ||
af8cdcd8 JB |
395 | static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
396 | struct ieee80211_bss *bss) | |
46900298 | 397 | { |
0c1ad2ca JB |
398 | struct cfg80211_bss *cbss = |
399 | container_of((void *)bss, struct cfg80211_bss, priv); | |
b59066a2 | 400 | struct ieee80211_supported_band *sband; |
75a423f4 | 401 | struct cfg80211_chan_def chandef; |
b59066a2 JB |
402 | u32 basic_rates; |
403 | int i, j; | |
0c1ad2ca | 404 | u16 beacon_int = cbss->beacon_interval; |
8cef2c9d | 405 | const struct cfg80211_bss_ies *ies; |
75a423f4 | 406 | enum nl80211_channel_type chan_type; |
8cef2c9d | 407 | u64 tsf; |
2103dec1 SW |
408 | u32 rate_flags; |
409 | int shift; | |
57c4d7b4 | 410 | |
8d61ffa5 | 411 | sdata_assert_lock(sdata); |
7a17a33c | 412 | |
57c4d7b4 JB |
413 | if (beacon_int < 10) |
414 | beacon_int = 10; | |
415 | ||
75a423f4 SW |
416 | switch (sdata->u.ibss.chandef.width) { |
417 | case NL80211_CHAN_WIDTH_20_NOHT: | |
418 | case NL80211_CHAN_WIDTH_20: | |
419 | case NL80211_CHAN_WIDTH_40: | |
420 | chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef); | |
421 | cfg80211_chandef_create(&chandef, cbss->channel, chan_type); | |
422 | break; | |
423 | case NL80211_CHAN_WIDTH_5: | |
424 | case NL80211_CHAN_WIDTH_10: | |
425 | cfg80211_chandef_create(&chandef, cbss->channel, | |
426 | NL80211_CHAN_WIDTH_20_NOHT); | |
427 | chandef.width = sdata->u.ibss.chandef.width; | |
428 | break; | |
abcff6ef JD |
429 | case NL80211_CHAN_WIDTH_80: |
430 | case NL80211_CHAN_WIDTH_160: | |
431 | chandef = sdata->u.ibss.chandef; | |
432 | chandef.chan = cbss->channel; | |
433 | break; | |
75a423f4 SW |
434 | default: |
435 | /* fall back to 20 MHz for unsupported modes */ | |
436 | cfg80211_chandef_create(&chandef, cbss->channel, | |
437 | NL80211_CHAN_WIDTH_20_NOHT); | |
438 | break; | |
439 | } | |
440 | ||
0c1ad2ca | 441 | sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; |
2103dec1 SW |
442 | rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef); |
443 | shift = ieee80211_vif_get_shift(&sdata->vif); | |
b59066a2 JB |
444 | |
445 | basic_rates = 0; | |
446 | ||
447 | for (i = 0; i < bss->supp_rates_len; i++) { | |
2103dec1 | 448 | int rate = bss->supp_rates[i] & 0x7f; |
b59066a2 JB |
449 | bool is_basic = !!(bss->supp_rates[i] & 0x80); |
450 | ||
451 | for (j = 0; j < sband->n_bitrates; j++) { | |
2103dec1 SW |
452 | int brate; |
453 | if ((rate_flags & sband->bitrates[j].flags) | |
454 | != rate_flags) | |
455 | continue; | |
456 | ||
457 | brate = DIV_ROUND_UP(sband->bitrates[j].bitrate, | |
458 | 5 * (1 << shift)); | |
459 | if (brate == rate) { | |
b59066a2 JB |
460 | if (is_basic) |
461 | basic_rates |= BIT(j); | |
462 | break; | |
463 | } | |
464 | } | |
465 | } | |
466 | ||
8cef2c9d JB |
467 | rcu_read_lock(); |
468 | ies = rcu_dereference(cbss->ies); | |
469 | tsf = ies->tsf; | |
470 | rcu_read_unlock(); | |
471 | ||
0c1ad2ca | 472 | __ieee80211_sta_join_ibss(sdata, cbss->bssid, |
57c4d7b4 | 473 | beacon_int, |
75a423f4 | 474 | &chandef, |
b59066a2 | 475 | basic_rates, |
0c1ad2ca | 476 | cbss->capability, |
8cef2c9d | 477 | tsf, false); |
46900298 JB |
478 | } |
479 | ||
cd7760e6 SW |
480 | int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata, |
481 | struct cfg80211_csa_settings *csa_settings) | |
482 | { | |
483 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
484 | struct beacon_data *presp, *old_presp; | |
485 | struct cfg80211_bss *cbss; | |
486 | const struct cfg80211_bss_ies *ies; | |
6eb18137 | 487 | u16 capability = 0; |
cd7760e6 SW |
488 | u64 tsf; |
489 | int ret = 0; | |
490 | ||
491 | sdata_assert_lock(sdata); | |
492 | ||
cd7760e6 | 493 | if (ifibss->privacy) |
6eb18137 | 494 | capability = WLAN_CAPABILITY_PRIVACY; |
cd7760e6 SW |
495 | |
496 | cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan, | |
497 | ifibss->bssid, ifibss->ssid, | |
6eb18137 DL |
498 | ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS, |
499 | IEEE80211_PRIVACY(ifibss->privacy)); | |
cd7760e6 SW |
500 | |
501 | if (WARN_ON(!cbss)) { | |
502 | ret = -EINVAL; | |
503 | goto out; | |
504 | } | |
505 | ||
506 | rcu_read_lock(); | |
507 | ies = rcu_dereference(cbss->ies); | |
508 | tsf = ies->tsf; | |
509 | rcu_read_unlock(); | |
510 | cfg80211_put_bss(sdata->local->hw.wiphy, cbss); | |
511 | ||
512 | old_presp = rcu_dereference_protected(ifibss->presp, | |
513 | lockdep_is_held(&sdata->wdev.mtx)); | |
514 | ||
515 | presp = ieee80211_ibss_build_presp(sdata, | |
516 | sdata->vif.bss_conf.beacon_int, | |
517 | sdata->vif.bss_conf.basic_rates, | |
518 | capability, tsf, &ifibss->chandef, | |
519 | NULL, csa_settings); | |
520 | if (!presp) { | |
521 | ret = -ENOMEM; | |
522 | goto out; | |
523 | } | |
524 | ||
525 | rcu_assign_pointer(ifibss->presp, presp); | |
526 | if (old_presp) | |
527 | kfree_rcu(old_presp, rcu_head); | |
528 | ||
dddd586b | 529 | return BSS_CHANGED_BEACON; |
cd7760e6 SW |
530 | out: |
531 | return ret; | |
532 | } | |
533 | ||
534 | int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata) | |
535 | { | |
536 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
537 | struct cfg80211_bss *cbss; | |
faf046e7 | 538 | int err, changed = 0; |
cd7760e6 | 539 | |
bafdc614 SW |
540 | sdata_assert_lock(sdata); |
541 | ||
cd7760e6 SW |
542 | /* update cfg80211 bss information with the new channel */ |
543 | if (!is_zero_ether_addr(ifibss->bssid)) { | |
cd7760e6 SW |
544 | cbss = cfg80211_get_bss(sdata->local->hw.wiphy, |
545 | ifibss->chandef.chan, | |
546 | ifibss->bssid, ifibss->ssid, | |
6eb18137 DL |
547 | ifibss->ssid_len, |
548 | IEEE80211_BSS_TYPE_IBSS, | |
549 | IEEE80211_PRIVACY(ifibss->privacy)); | |
cd7760e6 SW |
550 | /* XXX: should not really modify cfg80211 data */ |
551 | if (cbss) { | |
33787fc4 | 552 | cbss->channel = sdata->csa_chandef.chan; |
cd7760e6 SW |
553 | cfg80211_put_bss(sdata->local->hw.wiphy, cbss); |
554 | } | |
555 | } | |
556 | ||
33787fc4 | 557 | ifibss->chandef = sdata->csa_chandef; |
cd7760e6 SW |
558 | |
559 | /* generate the beacon */ | |
560 | err = ieee80211_ibss_csa_beacon(sdata, NULL); | |
cd7760e6 SW |
561 | if (err < 0) |
562 | return err; | |
563 | ||
faf046e7 | 564 | changed |= err; |
dddd586b | 565 | |
faf046e7 | 566 | return changed; |
cd7760e6 SW |
567 | } |
568 | ||
569 | void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata) | |
570 | { | |
571 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
572 | ||
573 | cancel_work_sync(&ifibss->csa_connection_drop_work); | |
574 | } | |
575 | ||
52874a5e | 576 | static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta) |
8bf11d8d JB |
577 | __acquires(RCU) |
578 | { | |
579 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
580 | u8 addr[ETH_ALEN]; | |
581 | ||
582 | memcpy(addr, sta->sta.addr, ETH_ALEN); | |
583 | ||
bdcbd8e0 | 584 | ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr); |
8bf11d8d | 585 | |
83d5cc01 JB |
586 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); |
587 | sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); | |
267335d6 AQ |
588 | /* authorize the station only if the network is not RSN protected. If |
589 | * not wait for the userspace to authorize it */ | |
590 | if (!sta->sdata->u.ibss.control_port) | |
591 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); | |
8bf11d8d JB |
592 | |
593 | rate_control_rate_init(sta); | |
594 | ||
595 | /* If it fails, maybe we raced another insertion? */ | |
596 | if (sta_info_insert_rcu(sta)) | |
597 | return sta_info_get(sdata, addr); | |
598 | return sta; | |
599 | } | |
600 | ||
601 | static struct sta_info * | |
52874a5e AQ |
602 | ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid, |
603 | const u8 *addr, u32 supp_rates) | |
8bf11d8d JB |
604 | __acquires(RCU) |
605 | { | |
606 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
607 | struct ieee80211_local *local = sdata->local; | |
608 | struct sta_info *sta; | |
55de908a | 609 | struct ieee80211_chanctx_conf *chanctx_conf; |
b422c6cd | 610 | struct ieee80211_supported_band *sband; |
74608aca | 611 | enum nl80211_bss_scan_width scan_width; |
55de908a | 612 | int band; |
8bf11d8d JB |
613 | |
614 | /* | |
615 | * XXX: Consider removing the least recently used entry and | |
616 | * allow new one to be added. | |
617 | */ | |
618 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { | |
bdcbd8e0 | 619 | net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
e87cc472 | 620 | sdata->name, addr); |
8bf11d8d JB |
621 | rcu_read_lock(); |
622 | return NULL; | |
623 | } | |
624 | ||
625 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { | |
626 | rcu_read_lock(); | |
627 | return NULL; | |
628 | } | |
629 | ||
b203ca39 | 630 | if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) { |
8bf11d8d JB |
631 | rcu_read_lock(); |
632 | return NULL; | |
633 | } | |
634 | ||
55de908a JB |
635 | rcu_read_lock(); |
636 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
637 | if (WARN_ON_ONCE(!chanctx_conf)) | |
638 | return NULL; | |
4bf88530 | 639 | band = chanctx_conf->def.chan->band; |
74608aca | 640 | scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); |
55de908a JB |
641 | rcu_read_unlock(); |
642 | ||
8bf11d8d JB |
643 | sta = sta_info_alloc(sdata, addr, GFP_KERNEL); |
644 | if (!sta) { | |
645 | rcu_read_lock(); | |
646 | return NULL; | |
647 | } | |
648 | ||
649 | sta->last_rx = jiffies; | |
650 | ||
651 | /* make sure mandatory rates are always added */ | |
b422c6cd | 652 | sband = local->hw.wiphy->bands[band]; |
8bf11d8d | 653 | sta->sta.supp_rates[band] = supp_rates | |
74608aca | 654 | ieee80211_mandatory_rates(sband, scan_width); |
8bf11d8d | 655 | |
52874a5e | 656 | return ieee80211_ibss_finish_sta(sta); |
6d810f10 AQ |
657 | } |
658 | ||
871a4180 SW |
659 | static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) |
660 | { | |
661 | struct ieee80211_local *local = sdata->local; | |
662 | int active = 0; | |
663 | struct sta_info *sta; | |
664 | ||
665 | sdata_assert_lock(sdata); | |
666 | ||
667 | rcu_read_lock(); | |
668 | ||
669 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
670 | if (sta->sdata == sdata && | |
671 | time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL, | |
672 | jiffies)) { | |
673 | active++; | |
674 | break; | |
675 | } | |
676 | } | |
677 | ||
678 | rcu_read_unlock(); | |
679 | ||
680 | return active; | |
681 | } | |
682 | ||
683 | static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata) | |
684 | { | |
685 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
686 | struct ieee80211_local *local = sdata->local; | |
687 | struct cfg80211_bss *cbss; | |
688 | struct beacon_data *presp; | |
689 | struct sta_info *sta; | |
871a4180 | 690 | |
d4c80d9d | 691 | if (!is_zero_ether_addr(ifibss->bssid)) { |
871a4180 SW |
692 | cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan, |
693 | ifibss->bssid, ifibss->ssid, | |
6eb18137 DL |
694 | ifibss->ssid_len, |
695 | IEEE80211_BSS_TYPE_IBSS, | |
696 | IEEE80211_PRIVACY(ifibss->privacy)); | |
871a4180 SW |
697 | |
698 | if (cbss) { | |
699 | cfg80211_unlink_bss(local->hw.wiphy, cbss); | |
700 | cfg80211_put_bss(sdata->local->hw.wiphy, cbss); | |
701 | } | |
702 | } | |
703 | ||
704 | ifibss->state = IEEE80211_IBSS_MLME_SEARCH; | |
705 | ||
706 | sta_info_flush(sdata); | |
707 | ||
708 | spin_lock_bh(&ifibss->incomplete_lock); | |
709 | while (!list_empty(&ifibss->incomplete_stations)) { | |
710 | sta = list_first_entry(&ifibss->incomplete_stations, | |
711 | struct sta_info, list); | |
712 | list_del(&sta->list); | |
713 | spin_unlock_bh(&ifibss->incomplete_lock); | |
714 | ||
715 | sta_info_free(local, sta); | |
716 | spin_lock_bh(&ifibss->incomplete_lock); | |
717 | } | |
718 | spin_unlock_bh(&ifibss->incomplete_lock); | |
719 | ||
720 | netif_carrier_off(sdata->dev); | |
721 | ||
722 | sdata->vif.bss_conf.ibss_joined = false; | |
723 | sdata->vif.bss_conf.ibss_creator = false; | |
724 | sdata->vif.bss_conf.enable_beacon = false; | |
725 | sdata->vif.bss_conf.ssid_len = 0; | |
726 | ||
727 | /* remove beacon */ | |
728 | presp = rcu_dereference_protected(ifibss->presp, | |
729 | lockdep_is_held(&sdata->wdev.mtx)); | |
730 | RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); | |
731 | if (presp) | |
732 | kfree_rcu(presp, rcu_head); | |
733 | ||
734 | clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); | |
735 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | | |
736 | BSS_CHANGED_IBSS); | |
55fff501 | 737 | drv_leave_ibss(local, sdata); |
34a3740d | 738 | mutex_lock(&local->mtx); |
871a4180 | 739 | ieee80211_vif_release_channel(sdata); |
34a3740d | 740 | mutex_unlock(&local->mtx); |
871a4180 SW |
741 | } |
742 | ||
cd7760e6 SW |
743 | static void ieee80211_csa_connection_drop_work(struct work_struct *work) |
744 | { | |
745 | struct ieee80211_sub_if_data *sdata = | |
746 | container_of(work, struct ieee80211_sub_if_data, | |
747 | u.ibss.csa_connection_drop_work); | |
748 | ||
6f07d216 LC |
749 | sdata_lock(sdata); |
750 | ||
cd7760e6 SW |
751 | ieee80211_ibss_disconnect(sdata); |
752 | synchronize_rcu(); | |
753 | skb_queue_purge(&sdata->skb_queue); | |
754 | ||
755 | /* trigger a scan to find another IBSS network to join */ | |
756 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); | |
6f07d216 LC |
757 | |
758 | sdata_unlock(sdata); | |
cd7760e6 SW |
759 | } |
760 | ||
8e8d347d SW |
761 | static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata) |
762 | { | |
763 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
764 | int err; | |
765 | ||
766 | /* if the current channel is a DFS channel, mark the channel as | |
767 | * unavailable. | |
768 | */ | |
769 | err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, | |
2beb6dab LC |
770 | &ifibss->chandef, |
771 | NL80211_IFTYPE_ADHOC); | |
8e8d347d SW |
772 | if (err > 0) |
773 | cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef, | |
774 | GFP_ATOMIC); | |
775 | } | |
776 | ||
cd7760e6 SW |
777 | static bool |
778 | ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata, | |
779 | struct ieee802_11_elems *elems, | |
780 | bool beacon) | |
781 | { | |
782 | struct cfg80211_csa_settings params; | |
c0f17eb9 | 783 | struct ieee80211_csa_ie csa_ie; |
cd7760e6 | 784 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
cd7760e6 | 785 | enum nl80211_channel_type ch_type; |
82a8e17d | 786 | int err; |
cd7760e6 | 787 | u32 sta_flags; |
cd7760e6 | 788 | |
dbd72850 MK |
789 | sdata_assert_lock(sdata); |
790 | ||
cd7760e6 SW |
791 | sta_flags = IEEE80211_STA_DISABLE_VHT; |
792 | switch (ifibss->chandef.width) { | |
793 | case NL80211_CHAN_WIDTH_5: | |
794 | case NL80211_CHAN_WIDTH_10: | |
795 | case NL80211_CHAN_WIDTH_20_NOHT: | |
796 | sta_flags |= IEEE80211_STA_DISABLE_HT; | |
797 | /* fall through */ | |
798 | case NL80211_CHAN_WIDTH_20: | |
799 | sta_flags |= IEEE80211_STA_DISABLE_40MHZ; | |
800 | break; | |
801 | default: | |
802 | break; | |
803 | } | |
804 | ||
805 | memset(¶ms, 0, sizeof(params)); | |
c0f17eb9 | 806 | memset(&csa_ie, 0, sizeof(csa_ie)); |
84469a45 | 807 | err = ieee80211_parse_ch_switch_ie(sdata, elems, |
cd7760e6 | 808 | ifibss->chandef.chan->band, |
c0f17eb9 | 809 | sta_flags, ifibss->bssid, &csa_ie); |
cd7760e6 SW |
810 | /* can't switch to destination channel, fail */ |
811 | if (err < 0) | |
812 | goto disconnect; | |
813 | ||
814 | /* did not contain a CSA */ | |
815 | if (err) | |
816 | return false; | |
817 | ||
0834ae3c SW |
818 | /* channel switch is not supported, disconnect */ |
819 | if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH)) | |
820 | goto disconnect; | |
821 | ||
c0f17eb9 CYY |
822 | params.count = csa_ie.count; |
823 | params.chandef = csa_ie.chandef; | |
824 | ||
cd7760e6 SW |
825 | switch (ifibss->chandef.width) { |
826 | case NL80211_CHAN_WIDTH_20_NOHT: | |
827 | case NL80211_CHAN_WIDTH_20: | |
828 | case NL80211_CHAN_WIDTH_40: | |
829 | /* keep our current HT mode (HT20/HT40+/HT40-), even if | |
830 | * another mode has been announced. The mode is not adopted | |
831 | * within the beacon while doing CSA and we should therefore | |
832 | * keep the mode which we announce. | |
833 | */ | |
834 | ch_type = cfg80211_get_chandef_type(&ifibss->chandef); | |
835 | cfg80211_chandef_create(¶ms.chandef, params.chandef.chan, | |
836 | ch_type); | |
837 | break; | |
838 | case NL80211_CHAN_WIDTH_5: | |
839 | case NL80211_CHAN_WIDTH_10: | |
840 | if (params.chandef.width != ifibss->chandef.width) { | |
841 | sdata_info(sdata, | |
842 | "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", | |
843 | ifibss->bssid, | |
844 | params.chandef.chan->center_freq, | |
845 | params.chandef.width, | |
846 | params.chandef.center_freq1, | |
847 | params.chandef.center_freq2); | |
848 | goto disconnect; | |
849 | } | |
850 | break; | |
851 | default: | |
852 | /* should not happen, sta_flags should prevent VHT modes. */ | |
853 | WARN_ON(1); | |
854 | goto disconnect; | |
855 | } | |
856 | ||
174e0cd2 IP |
857 | if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef, |
858 | NL80211_IFTYPE_ADHOC)) { | |
cd7760e6 SW |
859 | sdata_info(sdata, |
860 | "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", | |
861 | ifibss->bssid, | |
862 | params.chandef.chan->center_freq, | |
863 | params.chandef.width, | |
864 | params.chandef.center_freq1, | |
865 | params.chandef.center_freq2); | |
866 | goto disconnect; | |
867 | } | |
868 | ||
869 | err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, | |
2beb6dab LC |
870 | ¶ms.chandef, |
871 | NL80211_IFTYPE_ADHOC); | |
cd7760e6 SW |
872 | if (err < 0) |
873 | goto disconnect; | |
2beb6dab | 874 | if (err > 0 && !ifibss->userspace_handles_dfs) { |
8e8d347d | 875 | /* IBSS-DFS only allowed with a control program */ |
2beb6dab | 876 | goto disconnect; |
cd7760e6 SW |
877 | } |
878 | ||
2beb6dab LC |
879 | params.radar_required = err; |
880 | ||
82a8e17d LC |
881 | if (cfg80211_chandef_identical(¶ms.chandef, |
882 | &sdata->vif.bss_conf.chandef)) { | |
883 | ibss_dbg(sdata, | |
884 | "received csa with an identical chandef, ignoring\n"); | |
885 | return true; | |
cd7760e6 | 886 | } |
cd7760e6 SW |
887 | |
888 | /* all checks done, now perform the channel switch. */ | |
889 | ibss_dbg(sdata, | |
890 | "received channel switch announcement to go to channel %d MHz\n", | |
891 | params.chandef.chan->center_freq); | |
892 | ||
c0f17eb9 | 893 | params.block_tx = !!csa_ie.mode; |
cd7760e6 | 894 | |
82a8e17d LC |
895 | if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev, |
896 | ¶ms)) | |
897 | goto disconnect; | |
cd7760e6 | 898 | |
8e8d347d SW |
899 | ieee80211_ibss_csa_mark_radar(sdata); |
900 | ||
cd7760e6 SW |
901 | return true; |
902 | disconnect: | |
903 | ibss_dbg(sdata, "Can't handle channel switch, disconnect\n"); | |
904 | ieee80211_queue_work(&sdata->local->hw, | |
905 | &ifibss->csa_connection_drop_work); | |
906 | ||
8e8d347d SW |
907 | ieee80211_ibss_csa_mark_radar(sdata); |
908 | ||
cd7760e6 SW |
909 | return true; |
910 | } | |
911 | ||
912 | static void | |
913 | ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata, | |
914 | struct ieee80211_mgmt *mgmt, size_t len, | |
915 | struct ieee80211_rx_status *rx_status, | |
916 | struct ieee802_11_elems *elems) | |
917 | { | |
918 | int required_len; | |
919 | ||
920 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
921 | return; | |
922 | ||
923 | /* CSA is the only action we handle for now */ | |
924 | if (mgmt->u.action.u.measurement.action_code != | |
925 | WLAN_ACTION_SPCT_CHL_SWITCH) | |
926 | return; | |
927 | ||
928 | required_len = IEEE80211_MIN_ACTION_SIZE + | |
929 | sizeof(mgmt->u.action.u.chan_switch); | |
930 | if (len < required_len) | |
931 | return; | |
932 | ||
82a8e17d LC |
933 | if (!sdata->vif.csa_active) |
934 | ieee80211_ibss_process_chanswitch(sdata, elems, false); | |
cd7760e6 SW |
935 | } |
936 | ||
2cc59e78 AQ |
937 | static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata, |
938 | struct ieee80211_mgmt *mgmt, | |
939 | size_t len) | |
940 | { | |
941 | u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code); | |
942 | ||
943 | if (len < IEEE80211_DEAUTH_FRAME_LEN) | |
944 | return; | |
945 | ||
946 | ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n", | |
947 | mgmt->sa, mgmt->da, mgmt->bssid, reason); | |
948 | sta_info_destroy_addr(sdata, mgmt->sa); | |
949 | } | |
950 | ||
6d810f10 AQ |
951 | static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, |
952 | struct ieee80211_mgmt *mgmt, | |
953 | size_t len) | |
954 | { | |
955 | u16 auth_alg, auth_transaction; | |
956 | ||
8d61ffa5 | 957 | sdata_assert_lock(sdata); |
6d810f10 AQ |
958 | |
959 | if (len < 24 + 6) | |
960 | return; | |
961 | ||
962 | auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); | |
963 | auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); | |
964 | ||
bdcbd8e0 JB |
965 | ibss_dbg(sdata, |
966 | "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n", | |
967 | mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction); | |
7bed2050 AQ |
968 | |
969 | if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) | |
970 | return; | |
971 | ||
6d810f10 AQ |
972 | /* |
973 | * IEEE 802.11 standard does not require authentication in IBSS | |
974 | * networks and most implementations do not seem to use it. | |
975 | * However, try to reply to authentication attempts if someone | |
976 | * has actually implemented this. | |
977 | */ | |
700e8ea6 | 978 | ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0, |
1672c0e3 | 979 | mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0); |
8bf11d8d JB |
980 | } |
981 | ||
8a4988d1 JD |
982 | static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata, |
983 | struct ieee80211_mgmt *mgmt, size_t len, | |
984 | struct ieee80211_rx_status *rx_status, | |
985 | struct ieee802_11_elems *elems, | |
986 | struct ieee80211_channel *channel) | |
46900298 | 987 | { |
46900298 | 988 | struct sta_info *sta; |
46900298 | 989 | enum ieee80211_band band = rx_status->band; |
74608aca | 990 | enum nl80211_bss_scan_width scan_width; |
8a4988d1 | 991 | struct ieee80211_local *local = sdata->local; |
13c40c54 AS |
992 | struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; |
993 | bool rates_updated = false; | |
8a4988d1 | 994 | u32 supp_rates = 0; |
46900298 | 995 | |
8a4988d1 | 996 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
46900298 JB |
997 | return; |
998 | ||
8a4988d1 JD |
999 | if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) |
1000 | return; | |
46900298 | 1001 | |
8a4988d1 JD |
1002 | rcu_read_lock(); |
1003 | sta = sta_info_get(sdata, mgmt->sa); | |
1004 | ||
1005 | if (elems->supp_rates) { | |
1006 | supp_rates = ieee80211_sta_get_rates(sdata, elems, | |
1007 | band, NULL); | |
1008 | if (sta) { | |
1009 | u32 prev_rates; | |
1010 | ||
1011 | prev_rates = sta->sta.supp_rates[band]; | |
1012 | /* make sure mandatory rates are always added */ | |
1013 | scan_width = NL80211_BSS_CHAN_WIDTH_20; | |
1014 | if (rx_status->flag & RX_FLAG_5MHZ) | |
1015 | scan_width = NL80211_BSS_CHAN_WIDTH_5; | |
1016 | if (rx_status->flag & RX_FLAG_10MHZ) | |
1017 | scan_width = NL80211_BSS_CHAN_WIDTH_10; | |
1018 | ||
1019 | sta->sta.supp_rates[band] = supp_rates | | |
1020 | ieee80211_mandatory_rates(sband, scan_width); | |
1021 | if (sta->sta.supp_rates[band] != prev_rates) { | |
1022 | ibss_dbg(sdata, | |
1023 | "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", | |
1024 | sta->sta.addr, prev_rates, | |
1025 | sta->sta.supp_rates[band]); | |
1026 | rates_updated = true; | |
8bf11d8d | 1027 | } |
8a4988d1 JD |
1028 | } else { |
1029 | rcu_read_unlock(); | |
1030 | sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, | |
1031 | mgmt->sa, supp_rates); | |
34e89507 | 1032 | } |
8a4988d1 | 1033 | } |
9eba6125 | 1034 | |
96a4688e JB |
1035 | if (sta && !sta->sta.wme && |
1036 | elems->wmm_info && local->hw.queues >= IEEE80211_NUM_ACS) { | |
8a4988d1 | 1037 | sta->sta.wme = true; |
96a4688e JB |
1038 | ieee80211_check_fast_xmit(sta); |
1039 | } | |
13c40c54 | 1040 | |
8a4988d1 JD |
1041 | if (sta && elems->ht_operation && elems->ht_cap_elem && |
1042 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT && | |
1043 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 && | |
1044 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) { | |
1045 | /* we both use HT */ | |
1046 | struct ieee80211_ht_cap htcap_ie; | |
1047 | struct cfg80211_chan_def chandef; | |
abcff6ef | 1048 | enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth; |
d2954457 | 1049 | |
8a4988d1 JD |
1050 | ieee80211_ht_oper_to_chandef(channel, |
1051 | elems->ht_operation, | |
1052 | &chandef); | |
d2954457 | 1053 | |
8a4988d1 | 1054 | memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie)); |
8a4988d1 JD |
1055 | rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, |
1056 | &htcap_ie, | |
1057 | sta); | |
abcff6ef JD |
1058 | |
1059 | if (elems->vht_operation && elems->vht_cap_elem && | |
1060 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 && | |
1061 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) { | |
1062 | /* we both use VHT */ | |
1063 | struct ieee80211_vht_cap cap_ie; | |
1064 | struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap; | |
1065 | ||
1066 | ieee80211_vht_oper_to_chandef(channel, | |
1067 | elems->vht_operation, | |
1068 | &chandef); | |
1069 | memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie)); | |
1070 | ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband, | |
1071 | &cap_ie, sta); | |
1072 | if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap))) | |
1073 | rates_updated |= true; | |
13c40c54 AS |
1074 | } |
1075 | ||
abcff6ef JD |
1076 | if (bw != sta->sta.bandwidth) |
1077 | rates_updated |= true; | |
d2954457 | 1078 | |
abcff6ef JD |
1079 | if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef, |
1080 | &chandef)) | |
1081 | WARN_ON_ONCE(1); | |
8a4988d1 | 1082 | } |
d2954457 | 1083 | |
8a4988d1 JD |
1084 | if (sta && rates_updated) { |
1085 | u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED; | |
1086 | u8 rx_nss = sta->sta.rx_nss; | |
13c40c54 | 1087 | |
8a4988d1 JD |
1088 | /* Force rx_nss recalculation */ |
1089 | sta->sta.rx_nss = 0; | |
1090 | rate_control_rate_init(sta); | |
1091 | if (sta->sta.rx_nss != rx_nss) | |
1092 | changed |= IEEE80211_RC_NSS_CHANGED; | |
13c40c54 | 1093 | |
8a4988d1 | 1094 | drv_sta_rc_update(local, sdata, &sta->sta, changed); |
46900298 JB |
1095 | } |
1096 | ||
8a4988d1 JD |
1097 | rcu_read_unlock(); |
1098 | } | |
1099 | ||
1100 | static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, | |
1101 | struct ieee80211_mgmt *mgmt, size_t len, | |
1102 | struct ieee80211_rx_status *rx_status, | |
1103 | struct ieee802_11_elems *elems) | |
1104 | { | |
1105 | struct ieee80211_local *local = sdata->local; | |
1106 | struct cfg80211_bss *cbss; | |
1107 | struct ieee80211_bss *bss; | |
1108 | struct ieee80211_channel *channel; | |
1109 | u64 beacon_timestamp, rx_timestamp; | |
1110 | u32 supp_rates = 0; | |
1111 | enum ieee80211_band band = rx_status->band; | |
1112 | ||
1113 | channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); | |
1114 | if (!channel) | |
1115 | return; | |
1116 | ||
1117 | ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel); | |
1118 | ||
46900298 | 1119 | bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, |
d45c4172 | 1120 | channel); |
46900298 JB |
1121 | if (!bss) |
1122 | return; | |
1123 | ||
0c1ad2ca JB |
1124 | cbss = container_of((void *)bss, struct cfg80211_bss, priv); |
1125 | ||
8cef2c9d JB |
1126 | /* same for beacon and probe response */ |
1127 | beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp); | |
46900298 JB |
1128 | |
1129 | /* check if we need to merge IBSS */ | |
1130 | ||
46900298 | 1131 | /* not an IBSS */ |
0c1ad2ca | 1132 | if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) |
46900298 JB |
1133 | goto put_bss; |
1134 | ||
1135 | /* different channel */ | |
55de908a | 1136 | if (sdata->u.ibss.fixed_channel && |
3aede78a | 1137 | sdata->u.ibss.chandef.chan != cbss->channel) |
46900298 JB |
1138 | goto put_bss; |
1139 | ||
1140 | /* different SSID */ | |
1141 | if (elems->ssid_len != sdata->u.ibss.ssid_len || | |
1142 | memcmp(elems->ssid, sdata->u.ibss.ssid, | |
1143 | sdata->u.ibss.ssid_len)) | |
1144 | goto put_bss; | |
1145 | ||
cd7760e6 | 1146 | /* process channel switch */ |
82a8e17d LC |
1147 | if (sdata->vif.csa_active || |
1148 | ieee80211_ibss_process_chanswitch(sdata, elems, true)) | |
cd7760e6 SW |
1149 | goto put_bss; |
1150 | ||
34e8f082 | 1151 | /* same BSSID */ |
b203ca39 | 1152 | if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) |
34e8f082 AF |
1153 | goto put_bss; |
1154 | ||
cd7760e6 SW |
1155 | /* we use a fixed BSSID */ |
1156 | if (sdata->u.ibss.fixed_bssid) | |
1157 | goto put_bss; | |
1158 | ||
f4bda337 TP |
1159 | if (ieee80211_have_rx_timestamp(rx_status)) { |
1160 | /* time when timestamp field was received */ | |
1161 | rx_timestamp = | |
1162 | ieee80211_calculate_rx_timestamp(local, rx_status, | |
1163 | len + FCS_LEN, 24); | |
24487981 JB |
1164 | } else { |
1165 | /* | |
1166 | * second best option: get current TSF | |
1167 | * (will return -1 if not supported) | |
1168 | */ | |
37a41b4a | 1169 | rx_timestamp = drv_get_tsf(local, sdata); |
24487981 | 1170 | } |
46900298 | 1171 | |
bdcbd8e0 JB |
1172 | ibss_dbg(sdata, |
1173 | "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", | |
1174 | mgmt->sa, mgmt->bssid, | |
1175 | (unsigned long long)rx_timestamp, | |
1176 | (unsigned long long)beacon_timestamp, | |
1177 | (unsigned long long)(rx_timestamp - beacon_timestamp), | |
1178 | jiffies); | |
46900298 JB |
1179 | |
1180 | if (beacon_timestamp > rx_timestamp) { | |
bdcbd8e0 JB |
1181 | ibss_dbg(sdata, |
1182 | "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", | |
1183 | mgmt->bssid); | |
46900298 | 1184 | ieee80211_sta_join_ibss(sdata, bss); |
2103dec1 | 1185 | supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL); |
34e89507 | 1186 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, |
52874a5e | 1187 | supp_rates); |
8bf11d8d | 1188 | rcu_read_unlock(); |
46900298 JB |
1189 | } |
1190 | ||
1191 | put_bss: | |
1192 | ieee80211_rx_bss_put(local, bss); | |
1193 | } | |
1194 | ||
8bf11d8d JB |
1195 | void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, |
1196 | const u8 *bssid, const u8 *addr, | |
1197 | u32 supp_rates) | |
46900298 | 1198 | { |
2e10d330 | 1199 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
46900298 JB |
1200 | struct ieee80211_local *local = sdata->local; |
1201 | struct sta_info *sta; | |
55de908a | 1202 | struct ieee80211_chanctx_conf *chanctx_conf; |
b422c6cd | 1203 | struct ieee80211_supported_band *sband; |
74608aca | 1204 | enum nl80211_bss_scan_width scan_width; |
55de908a | 1205 | int band; |
46900298 | 1206 | |
af8cdcd8 JB |
1207 | /* |
1208 | * XXX: Consider removing the least recently used entry and | |
1209 | * allow new one to be added. | |
1210 | */ | |
46900298 | 1211 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { |
bdcbd8e0 | 1212 | net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
e87cc472 | 1213 | sdata->name, addr); |
8bf11d8d | 1214 | return; |
46900298 JB |
1215 | } |
1216 | ||
2e10d330 | 1217 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) |
8bf11d8d | 1218 | return; |
2e10d330 | 1219 | |
b203ca39 | 1220 | if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) |
8bf11d8d | 1221 | return; |
46900298 | 1222 | |
55de908a JB |
1223 | rcu_read_lock(); |
1224 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
1225 | if (WARN_ON_ONCE(!chanctx_conf)) { | |
1226 | rcu_read_unlock(); | |
1227 | return; | |
1228 | } | |
4bf88530 | 1229 | band = chanctx_conf->def.chan->band; |
74608aca | 1230 | scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); |
55de908a JB |
1231 | rcu_read_unlock(); |
1232 | ||
8bf11d8d | 1233 | sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); |
46900298 | 1234 | if (!sta) |
8bf11d8d | 1235 | return; |
46900298 | 1236 | |
c8716d9d | 1237 | sta->last_rx = jiffies; |
d9a7ddb0 | 1238 | |
46900298 | 1239 | /* make sure mandatory rates are always added */ |
b422c6cd | 1240 | sband = local->hw.wiphy->bands[band]; |
46900298 | 1241 | sta->sta.supp_rates[band] = supp_rates | |
74608aca | 1242 | ieee80211_mandatory_rates(sband, scan_width); |
46900298 | 1243 | |
8bf11d8d JB |
1244 | spin_lock(&ifibss->incomplete_lock); |
1245 | list_add(&sta->list, &ifibss->incomplete_stations); | |
1246 | spin_unlock(&ifibss->incomplete_lock); | |
1247 | ieee80211_queue_work(&local->hw, &sdata->work); | |
46900298 JB |
1248 | } |
1249 | ||
dad9defd AQ |
1250 | static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata) |
1251 | { | |
1252 | struct ieee80211_local *local = sdata->local; | |
1253 | struct sta_info *sta, *tmp; | |
1254 | unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT; | |
1255 | unsigned long exp_rsn_time = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT; | |
1256 | ||
1257 | mutex_lock(&local->sta_mtx); | |
1258 | ||
1259 | list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { | |
1260 | if (sdata != sta->sdata) | |
1261 | continue; | |
1262 | ||
1263 | if (time_after(jiffies, sta->last_rx + exp_time) || | |
1264 | (time_after(jiffies, sta->last_rx + exp_rsn_time) && | |
1265 | sta->sta_state != IEEE80211_STA_AUTHORIZED)) { | |
1266 | sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n", | |
1267 | sta->sta_state != IEEE80211_STA_AUTHORIZED ? | |
1268 | "not authorized " : "", sta->sta.addr); | |
1269 | ||
1270 | WARN_ON(__sta_info_destroy(sta)); | |
1271 | } | |
1272 | } | |
1273 | ||
1274 | mutex_unlock(&local->sta_mtx); | |
1275 | } | |
1276 | ||
ce9058ae BP |
1277 | /* |
1278 | * This function is called with state == IEEE80211_IBSS_MLME_JOINED | |
1279 | */ | |
46900298 JB |
1280 | |
1281 | static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) | |
1282 | { | |
1283 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
7ca15a0a | 1284 | enum nl80211_bss_scan_width scan_width; |
46900298 | 1285 | |
8d61ffa5 | 1286 | sdata_assert_lock(sdata); |
7a17a33c | 1287 | |
af8cdcd8 JB |
1288 | mod_timer(&ifibss->timer, |
1289 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 | 1290 | |
dad9defd | 1291 | ieee80211_ibss_sta_expire(sdata); |
af8cdcd8 | 1292 | |
450aae3d S |
1293 | if (time_before(jiffies, ifibss->last_scan_completed + |
1294 | IEEE80211_IBSS_MERGE_INTERVAL)) | |
1295 | return; | |
1296 | ||
46900298 JB |
1297 | if (ieee80211_sta_active_ibss(sdata)) |
1298 | return; | |
1299 | ||
c037b836 | 1300 | if (ifibss->fixed_channel) |
46900298 JB |
1301 | return; |
1302 | ||
bdcbd8e0 JB |
1303 | sdata_info(sdata, |
1304 | "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); | |
46900298 | 1305 | |
7ca15a0a | 1306 | scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); |
34bcf715 | 1307 | ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len, |
76bed0f4 | 1308 | NULL, 0, scan_width); |
46900298 JB |
1309 | } |
1310 | ||
af8cdcd8 | 1311 | static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
1312 | { |
1313 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
46900298 | 1314 | u8 bssid[ETH_ALEN]; |
46900298 JB |
1315 | u16 capability; |
1316 | int i; | |
1317 | ||
8d61ffa5 | 1318 | sdata_assert_lock(sdata); |
7a17a33c | 1319 | |
af8cdcd8 | 1320 | if (ifibss->fixed_bssid) { |
46900298 JB |
1321 | memcpy(bssid, ifibss->bssid, ETH_ALEN); |
1322 | } else { | |
1323 | /* Generate random, not broadcast, locally administered BSSID. Mix in | |
1324 | * own MAC address to make sure that devices that do not have proper | |
1325 | * random number generator get different BSSID. */ | |
1326 | get_random_bytes(bssid, ETH_ALEN); | |
1327 | for (i = 0; i < ETH_ALEN; i++) | |
47846c9b | 1328 | bssid[i] ^= sdata->vif.addr[i]; |
46900298 JB |
1329 | bssid[0] &= ~0x01; |
1330 | bssid[0] |= 0x02; | |
1331 | } | |
1332 | ||
bdcbd8e0 | 1333 | sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); |
46900298 | 1334 | |
46900298 JB |
1335 | capability = WLAN_CAPABILITY_IBSS; |
1336 | ||
fffd0934 | 1337 | if (ifibss->privacy) |
46900298 | 1338 | capability |= WLAN_CAPABILITY_PRIVACY; |
46900298 | 1339 | |
57c4d7b4 | 1340 | __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, |
75a423f4 | 1341 | &ifibss->chandef, ifibss->basic_rates, |
c13a765b | 1342 | capability, 0, true); |
46900298 JB |
1343 | } |
1344 | ||
76bed0f4 JD |
1345 | static unsigned ibss_setup_channels(struct wiphy *wiphy, |
1346 | struct ieee80211_channel **channels, | |
1347 | unsigned int channels_max, | |
1348 | u32 center_freq, u32 width) | |
1349 | { | |
1350 | struct ieee80211_channel *chan = NULL; | |
1351 | unsigned int n_chan = 0; | |
1352 | u32 start_freq, end_freq, freq; | |
1353 | ||
1354 | if (width <= 20) { | |
1355 | start_freq = center_freq; | |
1356 | end_freq = center_freq; | |
1357 | } else { | |
1358 | start_freq = center_freq - width / 2 + 10; | |
1359 | end_freq = center_freq + width / 2 - 10; | |
1360 | } | |
1361 | ||
1362 | for (freq = start_freq; freq <= end_freq; freq += 20) { | |
1363 | chan = ieee80211_get_channel(wiphy, freq); | |
1364 | if (!chan) | |
1365 | continue; | |
1366 | if (n_chan >= channels_max) | |
1367 | return n_chan; | |
1368 | ||
1369 | channels[n_chan] = chan; | |
1370 | n_chan++; | |
1371 | } | |
1372 | ||
1373 | return n_chan; | |
1374 | } | |
1375 | ||
1376 | static unsigned int | |
1377 | ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy, | |
1378 | const struct cfg80211_chan_def *chandef, | |
1379 | struct ieee80211_channel **channels, | |
1380 | unsigned int channels_max) | |
1381 | { | |
1382 | unsigned int n_chan = 0; | |
1383 | u32 width, cf1, cf2 = 0; | |
1384 | ||
1385 | switch (chandef->width) { | |
1386 | case NL80211_CHAN_WIDTH_40: | |
1387 | width = 40; | |
1388 | break; | |
1389 | case NL80211_CHAN_WIDTH_80P80: | |
1390 | cf2 = chandef->center_freq2; | |
1391 | /* fall through */ | |
1392 | case NL80211_CHAN_WIDTH_80: | |
1393 | width = 80; | |
1394 | break; | |
1395 | case NL80211_CHAN_WIDTH_160: | |
1396 | width = 160; | |
1397 | break; | |
1398 | default: | |
1399 | width = 20; | |
1400 | break; | |
1401 | } | |
1402 | ||
1403 | cf1 = chandef->center_freq1; | |
1404 | ||
1405 | n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width); | |
1406 | ||
1407 | if (cf2) | |
1408 | n_chan += ibss_setup_channels(wiphy, &channels[n_chan], | |
1409 | channels_max - n_chan, cf2, | |
1410 | width); | |
1411 | ||
1412 | return n_chan; | |
1413 | } | |
1414 | ||
ce9058ae BP |
1415 | /* |
1416 | * This function is called with state == IEEE80211_IBSS_MLME_SEARCH | |
1417 | */ | |
1418 | ||
af8cdcd8 | 1419 | static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
1420 | { |
1421 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1422 | struct ieee80211_local *local = sdata->local; | |
0c1ad2ca | 1423 | struct cfg80211_bss *cbss; |
af8cdcd8 | 1424 | struct ieee80211_channel *chan = NULL; |
46900298 | 1425 | const u8 *bssid = NULL; |
7ca15a0a | 1426 | enum nl80211_bss_scan_width scan_width; |
46900298 JB |
1427 | int active_ibss; |
1428 | ||
8d61ffa5 | 1429 | sdata_assert_lock(sdata); |
7a17a33c | 1430 | |
46900298 | 1431 | active_ibss = ieee80211_sta_active_ibss(sdata); |
bdcbd8e0 | 1432 | ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); |
46900298 JB |
1433 | |
1434 | if (active_ibss) | |
af8cdcd8 | 1435 | return; |
46900298 | 1436 | |
af8cdcd8 JB |
1437 | if (ifibss->fixed_bssid) |
1438 | bssid = ifibss->bssid; | |
1439 | if (ifibss->fixed_channel) | |
3aede78a | 1440 | chan = ifibss->chandef.chan; |
af8cdcd8 | 1441 | if (!is_zero_ether_addr(ifibss->bssid)) |
46900298 | 1442 | bssid = ifibss->bssid; |
0c1ad2ca JB |
1443 | cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, |
1444 | ifibss->ssid, ifibss->ssid_len, | |
6eb18137 DL |
1445 | IEEE80211_BSS_TYPE_IBSS, |
1446 | IEEE80211_PRIVACY(ifibss->privacy)); | |
0c1ad2ca JB |
1447 | |
1448 | if (cbss) { | |
1449 | struct ieee80211_bss *bss; | |
46900298 | 1450 | |
0c1ad2ca | 1451 | bss = (void *)cbss->priv; |
bdcbd8e0 JB |
1452 | ibss_dbg(sdata, |
1453 | "sta_find_ibss: selected %pM current %pM\n", | |
1454 | cbss->bssid, ifibss->bssid); | |
1455 | sdata_info(sdata, | |
1456 | "Selected IBSS BSSID %pM based on configured SSID\n", | |
1457 | cbss->bssid); | |
46900298 | 1458 | |
af8cdcd8 | 1459 | ieee80211_sta_join_ibss(sdata, bss); |
46900298 | 1460 | ieee80211_rx_bss_put(local, bss); |
af8cdcd8 | 1461 | return; |
d419b9f0 | 1462 | } |
46900298 | 1463 | |
d8eb741e AQ |
1464 | /* if a fixed bssid and a fixed freq have been provided create the IBSS |
1465 | * directly and do not waste time scanning | |
1466 | */ | |
1467 | if (ifibss->fixed_bssid && ifibss->fixed_channel) { | |
1468 | sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n", | |
1469 | bssid); | |
1470 | ieee80211_sta_create_ibss(sdata); | |
1471 | return; | |
1472 | } | |
1473 | ||
1474 | ||
bdcbd8e0 | 1475 | ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); |
46900298 JB |
1476 | |
1477 | /* Selected IBSS not found in current scan results - try to scan */ | |
ce9058ae | 1478 | if (time_after(jiffies, ifibss->last_scan_completed + |
46900298 | 1479 | IEEE80211_SCAN_INTERVAL)) { |
76bed0f4 JD |
1480 | struct ieee80211_channel *channels[8]; |
1481 | unsigned int num; | |
1482 | ||
bdcbd8e0 | 1483 | sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); |
46900298 | 1484 | |
76bed0f4 JD |
1485 | num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy, |
1486 | &ifibss->chandef, | |
1487 | channels, | |
1488 | ARRAY_SIZE(channels)); | |
7ca15a0a | 1489 | scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); |
34bcf715 | 1490 | ieee80211_request_ibss_scan(sdata, ifibss->ssid, |
76bed0f4 | 1491 | ifibss->ssid_len, channels, num, |
7ca15a0a | 1492 | scan_width); |
ce9058ae | 1493 | } else { |
46900298 JB |
1494 | int interval = IEEE80211_SCAN_INTERVAL; |
1495 | ||
1496 | if (time_after(jiffies, ifibss->ibss_join_req + | |
55de908a JB |
1497 | IEEE80211_IBSS_JOIN_TIMEOUT)) |
1498 | ieee80211_sta_create_ibss(sdata); | |
46900298 | 1499 | |
af8cdcd8 JB |
1500 | mod_timer(&ifibss->timer, |
1501 | round_jiffies(jiffies + interval)); | |
46900298 | 1502 | } |
46900298 JB |
1503 | } |
1504 | ||
1505 | static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, | |
c269a203 | 1506 | struct sk_buff *req) |
46900298 | 1507 | { |
c269a203 | 1508 | struct ieee80211_mgmt *mgmt = (void *)req->data; |
46900298 JB |
1509 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
1510 | struct ieee80211_local *local = sdata->local; | |
c269a203 | 1511 | int tx_last_beacon, len = req->len; |
46900298 | 1512 | struct sk_buff *skb; |
c3ffeab4 | 1513 | struct beacon_data *presp; |
46900298 JB |
1514 | u8 *pos, *end; |
1515 | ||
8d61ffa5 | 1516 | sdata_assert_lock(sdata); |
7a17a33c | 1517 | |
40b275b6 | 1518 | presp = rcu_dereference_protected(ifibss->presp, |
8d61ffa5 | 1519 | lockdep_is_held(&sdata->wdev.mtx)); |
40b275b6 | 1520 | |
46900298 | 1521 | if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || |
40b275b6 | 1522 | len < 24 + 2 || !presp) |
46900298 JB |
1523 | return; |
1524 | ||
24487981 | 1525 | tx_last_beacon = drv_tx_last_beacon(local); |
46900298 | 1526 | |
bdcbd8e0 JB |
1527 | ibss_dbg(sdata, |
1528 | "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n", | |
1529 | mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon); | |
46900298 | 1530 | |
1ed76487 | 1531 | if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) |
46900298 JB |
1532 | return; |
1533 | ||
b203ca39 | 1534 | if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && |
888d04df | 1535 | !is_broadcast_ether_addr(mgmt->bssid)) |
46900298 JB |
1536 | return; |
1537 | ||
1538 | end = ((u8 *) mgmt) + len; | |
1539 | pos = mgmt->u.probe_req.variable; | |
1540 | if (pos[0] != WLAN_EID_SSID || | |
1541 | pos + 2 + pos[1] > end) { | |
bdcbd8e0 JB |
1542 | ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", |
1543 | mgmt->sa); | |
46900298 JB |
1544 | return; |
1545 | } | |
1546 | if (pos[1] != 0 && | |
1547 | (pos[1] != ifibss->ssid_len || | |
0da780c2 | 1548 | memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { |
46900298 JB |
1549 | /* Ignore ProbeReq for foreign SSID */ |
1550 | return; | |
1551 | } | |
1552 | ||
1553 | /* Reply with ProbeResp */ | |
c3ffeab4 | 1554 | skb = dev_alloc_skb(local->tx_headroom + presp->head_len); |
46900298 JB |
1555 | if (!skb) |
1556 | return; | |
1557 | ||
c3ffeab4 JB |
1558 | skb_reserve(skb, local->tx_headroom); |
1559 | memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len); | |
1560 | ||
1561 | memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN); | |
1562 | ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa); | |
62ae67be | 1563 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
691eb61b SW |
1564 | |
1565 | /* avoid excessive retries for probe request to wildcard SSIDs */ | |
1566 | if (pos[1] == 0) | |
1567 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK; | |
1568 | ||
62ae67be | 1569 | ieee80211_tx_skb(sdata, skb); |
46900298 JB |
1570 | } |
1571 | ||
d45c4172 EG |
1572 | static |
1573 | void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata, | |
1574 | struct ieee80211_mgmt *mgmt, size_t len, | |
1575 | struct ieee80211_rx_status *rx_status) | |
46900298 JB |
1576 | { |
1577 | size_t baselen; | |
1578 | struct ieee802_11_elems elems; | |
1579 | ||
d45c4172 EG |
1580 | BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) != |
1581 | offsetof(typeof(mgmt->u.beacon), variable)); | |
1582 | ||
1583 | /* | |
1584 | * either beacon or probe_resp but the variable field is at the | |
1585 | * same offset | |
1586 | */ | |
46900298 JB |
1587 | baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; |
1588 | if (baselen > len) | |
1589 | return; | |
1590 | ||
1591 | ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, | |
b2e506bf | 1592 | false, &elems); |
46900298 | 1593 | |
d45c4172 | 1594 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); |
46900298 JB |
1595 | } |
1596 | ||
1fa57d01 JB |
1597 | void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, |
1598 | struct sk_buff *skb) | |
46900298 JB |
1599 | { |
1600 | struct ieee80211_rx_status *rx_status; | |
1601 | struct ieee80211_mgmt *mgmt; | |
1602 | u16 fc; | |
cd7760e6 SW |
1603 | struct ieee802_11_elems elems; |
1604 | int ies_len; | |
46900298 | 1605 | |
f1d58c25 | 1606 | rx_status = IEEE80211_SKB_RXCB(skb); |
46900298 JB |
1607 | mgmt = (struct ieee80211_mgmt *) skb->data; |
1608 | fc = le16_to_cpu(mgmt->frame_control); | |
1609 | ||
8d61ffa5 | 1610 | sdata_lock(sdata); |
7a17a33c | 1611 | |
c926d006 TH |
1612 | if (!sdata->u.ibss.ssid_len) |
1613 | goto mgmt_out; /* not ready to merge yet */ | |
1614 | ||
46900298 JB |
1615 | switch (fc & IEEE80211_FCTL_STYPE) { |
1616 | case IEEE80211_STYPE_PROBE_REQ: | |
c269a203 | 1617 | ieee80211_rx_mgmt_probe_req(sdata, skb); |
46900298 JB |
1618 | break; |
1619 | case IEEE80211_STYPE_PROBE_RESP: | |
46900298 | 1620 | case IEEE80211_STYPE_BEACON: |
d45c4172 EG |
1621 | ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len, |
1622 | rx_status); | |
46900298 JB |
1623 | break; |
1624 | case IEEE80211_STYPE_AUTH: | |
1625 | ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); | |
1626 | break; | |
2cc59e78 AQ |
1627 | case IEEE80211_STYPE_DEAUTH: |
1628 | ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); | |
1629 | break; | |
cd7760e6 SW |
1630 | case IEEE80211_STYPE_ACTION: |
1631 | switch (mgmt->u.action.category) { | |
1632 | case WLAN_CATEGORY_SPECTRUM_MGMT: | |
1633 | ies_len = skb->len - | |
1634 | offsetof(struct ieee80211_mgmt, | |
1635 | u.action.u.chan_switch.variable); | |
1636 | ||
1637 | if (ies_len < 0) | |
1638 | break; | |
1639 | ||
1640 | ieee802_11_parse_elems( | |
1641 | mgmt->u.action.u.chan_switch.variable, | |
1642 | ies_len, true, &elems); | |
1643 | ||
1644 | if (elems.parse_error) | |
1645 | break; | |
1646 | ||
1647 | ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len, | |
1648 | rx_status, &elems); | |
1649 | break; | |
1650 | } | |
46900298 | 1651 | } |
7a17a33c | 1652 | |
c926d006 | 1653 | mgmt_out: |
8d61ffa5 | 1654 | sdata_unlock(sdata); |
46900298 JB |
1655 | } |
1656 | ||
1fa57d01 | 1657 | void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) |
46900298 | 1658 | { |
1fa57d01 | 1659 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
8bf11d8d | 1660 | struct sta_info *sta; |
46900298 | 1661 | |
8d61ffa5 | 1662 | sdata_lock(sdata); |
7a17a33c JB |
1663 | |
1664 | /* | |
1665 | * Work could be scheduled after scan or similar | |
1666 | * when we aren't even joined (or trying) with a | |
1667 | * network. | |
1668 | */ | |
1669 | if (!ifibss->ssid_len) | |
1670 | goto out; | |
46900298 | 1671 | |
8bf11d8d JB |
1672 | spin_lock_bh(&ifibss->incomplete_lock); |
1673 | while (!list_empty(&ifibss->incomplete_stations)) { | |
1674 | sta = list_first_entry(&ifibss->incomplete_stations, | |
1675 | struct sta_info, list); | |
1676 | list_del(&sta->list); | |
1677 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1678 | ||
52874a5e | 1679 | ieee80211_ibss_finish_sta(sta); |
8bf11d8d JB |
1680 | rcu_read_unlock(); |
1681 | spin_lock_bh(&ifibss->incomplete_lock); | |
1682 | } | |
1683 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1684 | ||
46900298 JB |
1685 | switch (ifibss->state) { |
1686 | case IEEE80211_IBSS_MLME_SEARCH: | |
1687 | ieee80211_sta_find_ibss(sdata); | |
1688 | break; | |
1689 | case IEEE80211_IBSS_MLME_JOINED: | |
1690 | ieee80211_sta_merge_ibss(sdata); | |
1691 | break; | |
1692 | default: | |
1693 | WARN_ON(1); | |
1694 | break; | |
1695 | } | |
46900298 | 1696 | |
7a17a33c | 1697 | out: |
8d61ffa5 | 1698 | sdata_unlock(sdata); |
3a4d4aa2 JB |
1699 | } |
1700 | ||
46900298 JB |
1701 | static void ieee80211_ibss_timer(unsigned long data) |
1702 | { | |
1703 | struct ieee80211_sub_if_data *sdata = | |
1704 | (struct ieee80211_sub_if_data *) data; | |
5bb644a0 | 1705 | |
a6182943 | 1706 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
5bb644a0 | 1707 | } |
5bb644a0 | 1708 | |
46900298 JB |
1709 | void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) |
1710 | { | |
1711 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1712 | ||
46900298 JB |
1713 | setup_timer(&ifibss->timer, ieee80211_ibss_timer, |
1714 | (unsigned long) sdata); | |
8bf11d8d JB |
1715 | INIT_LIST_HEAD(&ifibss->incomplete_stations); |
1716 | spin_lock_init(&ifibss->incomplete_lock); | |
cd7760e6 SW |
1717 | INIT_WORK(&ifibss->csa_connection_drop_work, |
1718 | ieee80211_csa_connection_drop_work); | |
46900298 JB |
1719 | } |
1720 | ||
1721 | /* scan finished notification */ | |
1722 | void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) | |
1723 | { | |
af8cdcd8 | 1724 | struct ieee80211_sub_if_data *sdata; |
46900298 | 1725 | |
29b4a4f7 JB |
1726 | mutex_lock(&local->iflist_mtx); |
1727 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 1728 | if (!ieee80211_sdata_running(sdata)) |
0e41f715 | 1729 | continue; |
af8cdcd8 JB |
1730 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
1731 | continue; | |
1732 | sdata->u.ibss.last_scan_completed = jiffies; | |
7a17a33c | 1733 | ieee80211_queue_work(&local->hw, &sdata->work); |
46900298 | 1734 | } |
29b4a4f7 | 1735 | mutex_unlock(&local->iflist_mtx); |
46900298 JB |
1736 | } |
1737 | ||
af8cdcd8 JB |
1738 | int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, |
1739 | struct cfg80211_ibss_params *params) | |
1740 | { | |
ff3cc5f4 | 1741 | u32 changed = 0; |
2103dec1 SW |
1742 | u32 rate_flags; |
1743 | struct ieee80211_supported_band *sband; | |
71965c1d LC |
1744 | enum ieee80211_chanctx_mode chanmode; |
1745 | struct ieee80211_local *local = sdata->local; | |
1746 | int radar_detect_width = 0; | |
2103dec1 | 1747 | int i; |
71965c1d LC |
1748 | int ret; |
1749 | ||
1750 | ret = cfg80211_chandef_dfs_required(local->hw.wiphy, | |
1751 | ¶ms->chandef, | |
1752 | sdata->wdev.iftype); | |
1753 | if (ret < 0) | |
1754 | return ret; | |
1755 | ||
1756 | if (ret > 0) { | |
1757 | if (!params->userspace_handles_dfs) | |
1758 | return -EINVAL; | |
1759 | radar_detect_width = BIT(params->chandef.width); | |
1760 | } | |
1761 | ||
1762 | chanmode = (params->channel_fixed && !ret) ? | |
1763 | IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE; | |
1764 | ||
1765 | mutex_lock(&local->chanctx_mtx); | |
1766 | ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode, | |
1767 | radar_detect_width); | |
1768 | mutex_unlock(&local->chanctx_mtx); | |
1769 | if (ret < 0) | |
1770 | return ret; | |
af8cdcd8 | 1771 | |
af8cdcd8 JB |
1772 | if (params->bssid) { |
1773 | memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); | |
1774 | sdata->u.ibss.fixed_bssid = true; | |
1775 | } else | |
1776 | sdata->u.ibss.fixed_bssid = false; | |
1777 | ||
fffd0934 | 1778 | sdata->u.ibss.privacy = params->privacy; |
267335d6 | 1779 | sdata->u.ibss.control_port = params->control_port; |
8e8d347d | 1780 | sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs; |
fbd2c8dc | 1781 | sdata->u.ibss.basic_rates = params->basic_rates; |
c7d37a66 | 1782 | sdata->u.ibss.last_scan_completed = jiffies; |
2103dec1 SW |
1783 | |
1784 | /* fix basic_rates if channel does not support these rates */ | |
1785 | rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef); | |
71965c1d | 1786 | sband = local->hw.wiphy->bands[params->chandef.chan->band]; |
2103dec1 SW |
1787 | for (i = 0; i < sband->n_bitrates; i++) { |
1788 | if ((rate_flags & sband->bitrates[i].flags) != rate_flags) | |
1789 | sdata->u.ibss.basic_rates &= ~BIT(i); | |
1790 | } | |
dd5b4cc7 FF |
1791 | memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, |
1792 | sizeof(params->mcast_rate)); | |
fffd0934 | 1793 | |
57c4d7b4 JB |
1794 | sdata->vif.bss_conf.beacon_int = params->beacon_interval; |
1795 | ||
3aede78a | 1796 | sdata->u.ibss.chandef = params->chandef; |
af8cdcd8 JB |
1797 | sdata->u.ibss.fixed_channel = params->channel_fixed; |
1798 | ||
1799 | if (params->ie) { | |
1800 | sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, | |
1801 | GFP_KERNEL); | |
1802 | if (sdata->u.ibss.ie) | |
1803 | sdata->u.ibss.ie_len = params->ie_len; | |
1804 | } | |
1805 | ||
af8cdcd8 JB |
1806 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; |
1807 | sdata->u.ibss.ibss_join_req = jiffies; | |
1808 | ||
badecb00 | 1809 | memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); |
0e41f715 JB |
1810 | sdata->u.ibss.ssid_len = params->ssid_len; |
1811 | ||
822854b0 SW |
1812 | memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa, |
1813 | sizeof(sdata->u.ibss.ht_capa)); | |
1814 | memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask, | |
1815 | sizeof(sdata->u.ibss.ht_capa_mask)); | |
1816 | ||
ff3cc5f4 SW |
1817 | /* |
1818 | * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is | |
1819 | * reserved, but an HT STA shall protect HT transmissions as though | |
1820 | * the HT Protection field were set to non-HT mixed mode. | |
1821 | * | |
1822 | * In an IBSS, the RIFS Mode field of the HT Operation element is | |
1823 | * also reserved, but an HT STA shall operate as though this field | |
1824 | * were set to 1. | |
1825 | */ | |
1826 | ||
1827 | sdata->vif.bss_conf.ht_operation_mode |= | |
1828 | IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | |
1829 | | IEEE80211_HT_PARAM_RIFS_MODE; | |
1830 | ||
1831 | changed |= BSS_CHANGED_HT; | |
1832 | ieee80211_bss_info_change_notify(sdata, changed); | |
1833 | ||
04ecd257 | 1834 | sdata->smps_mode = IEEE80211_SMPS_OFF; |
71965c1d | 1835 | sdata->needed_rx_chains = local->rx_chains; |
04ecd257 | 1836 | |
71965c1d | 1837 | ieee80211_queue_work(&local->hw, &sdata->work); |
af8cdcd8 JB |
1838 | |
1839 | return 0; | |
1840 | } | |
1841 | ||
1842 | int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) | |
1843 | { | |
5ea096c0 | 1844 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
5ea096c0 | 1845 | |
871a4180 | 1846 | ieee80211_ibss_disconnect(sdata); |
b78a4932 | 1847 | ifibss->ssid_len = 0; |
c84a67a2 | 1848 | eth_zero_addr(ifibss->bssid); |
af8cdcd8 JB |
1849 | |
1850 | /* remove beacon */ | |
1851 | kfree(sdata->u.ibss.ie); | |
822854b0 SW |
1852 | |
1853 | /* on the next join, re-program HT parameters */ | |
1854 | memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa)); | |
1855 | memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask)); | |
1856 | ||
af8cdcd8 | 1857 | synchronize_rcu(); |
af8cdcd8 | 1858 | |
35f20c14 | 1859 | skb_queue_purge(&sdata->skb_queue); |
5cff20e6 | 1860 | |
bc05d19f | 1861 | del_timer_sync(&sdata->u.ibss.timer); |
7a17a33c | 1862 | |
af8cdcd8 JB |
1863 | return 0; |
1864 | } |