Commit | Line | Data |
---|---|---|
46900298 JB |
1 | /* |
2 | * IBSS mode implementation | |
3 | * Copyright 2003-2008, Jouni Malinen <j@w1.fi> | |
4 | * Copyright 2004, Instant802 Networks, Inc. | |
5 | * Copyright 2005, Devicescape Software, Inc. | |
6 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
7 | * Copyright 2007, Michael Wu <flamingice@sourmilk.net> | |
8 | * Copyright 2009, Johannes Berg <johannes@sipsolutions.net> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
13 | */ | |
14 | ||
15 | #include <linux/delay.h> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
46900298 JB |
17 | #include <linux/if_ether.h> |
18 | #include <linux/skbuff.h> | |
19 | #include <linux/if_arp.h> | |
20 | #include <linux/etherdevice.h> | |
21 | #include <linux/rtnetlink.h> | |
22 | #include <net/mac80211.h> | |
46900298 JB |
23 | |
24 | #include "ieee80211_i.h" | |
24487981 | 25 | #include "driver-ops.h" |
46900298 JB |
26 | #include "rate.h" |
27 | ||
28 | #define IEEE80211_SCAN_INTERVAL (2 * HZ) | |
46900298 JB |
29 | #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ) |
30 | ||
31 | #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ) | |
32 | #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ) | |
dad9defd | 33 | #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ) |
46900298 JB |
34 | |
35 | #define IEEE80211_IBSS_MAX_STA_ENTRIES 128 | |
36 | ||
d51b70ff SW |
37 | static struct beacon_data * |
38 | ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata, | |
39 | const int beacon_int, const u32 basic_rates, | |
40 | const u16 capability, u64 tsf, | |
41 | struct cfg80211_chan_def *chandef, | |
cd7760e6 SW |
42 | bool *have_higher_than_11mbit, |
43 | struct cfg80211_csa_settings *csa_settings) | |
46900298 JB |
44 | { |
45 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
46 | struct ieee80211_local *local = sdata->local; | |
2103dec1 | 47 | int rates_n = 0, i, ri; |
46900298 JB |
48 | struct ieee80211_mgmt *mgmt; |
49 | u8 *pos; | |
50 | struct ieee80211_supported_band *sband; | |
d51b70ff | 51 | u32 rate_flags, rates = 0, rates_added = 0; |
c3ffeab4 JB |
52 | struct beacon_data *presp; |
53 | int frame_len; | |
2103dec1 | 54 | int shift; |
24487981 | 55 | |
46900298 | 56 | /* Build IBSS probe response */ |
c3ffeab4 JB |
57 | frame_len = sizeof(struct ieee80211_hdr_3addr) + |
58 | 12 /* struct ieee80211_mgmt.u.beacon */ + | |
59 | 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ + | |
60 | 2 + 8 /* max Supported Rates */ + | |
61 | 3 /* max DS params */ + | |
62 | 4 /* IBSS params */ + | |
cd7760e6 | 63 | 5 /* Channel Switch Announcement */ + |
c3ffeab4 JB |
64 | 2 + (IEEE80211_MAX_SUPP_RATES - 8) + |
65 | 2 + sizeof(struct ieee80211_ht_cap) + | |
66 | 2 + sizeof(struct ieee80211_ht_operation) + | |
67 | ifibss->ie_len; | |
68 | presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL); | |
69 | if (!presp) | |
d51b70ff | 70 | return NULL; |
c3ffeab4 JB |
71 | |
72 | presp->head = (void *)(presp + 1); | |
73 | ||
74 | mgmt = (void *) presp->head; | |
46900298 JB |
75 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
76 | IEEE80211_STYPE_PROBE_RESP); | |
e83e6541 | 77 | eth_broadcast_addr(mgmt->da); |
47846c9b | 78 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
46900298 | 79 | memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN); |
57c4d7b4 | 80 | mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int); |
707c1b4e | 81 | mgmt->u.beacon.timestamp = cpu_to_le64(tsf); |
46900298 JB |
82 | mgmt->u.beacon.capab_info = cpu_to_le16(capability); |
83 | ||
c3ffeab4 JB |
84 | pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable); |
85 | ||
46900298 JB |
86 | *pos++ = WLAN_EID_SSID; |
87 | *pos++ = ifibss->ssid_len; | |
88 | memcpy(pos, ifibss->ssid, ifibss->ssid_len); | |
c3ffeab4 | 89 | pos += ifibss->ssid_len; |
46900298 | 90 | |
d51b70ff SW |
91 | sband = local->hw.wiphy->bands[chandef->chan->band]; |
92 | rate_flags = ieee80211_chandef_rate_flags(chandef); | |
93 | shift = ieee80211_chandef_get_shift(chandef); | |
94 | rates_n = 0; | |
95 | if (have_higher_than_11mbit) | |
96 | *have_higher_than_11mbit = false; | |
97 | ||
2103dec1 SW |
98 | for (i = 0; i < sband->n_bitrates; i++) { |
99 | if ((rate_flags & sband->bitrates[i].flags) != rate_flags) | |
100 | continue; | |
d51b70ff SW |
101 | if (sband->bitrates[i].bitrate > 110 && |
102 | have_higher_than_11mbit) | |
103 | *have_higher_than_11mbit = true; | |
2103dec1 SW |
104 | |
105 | rates |= BIT(i); | |
106 | rates_n++; | |
107 | } | |
108 | ||
46900298 | 109 | *pos++ = WLAN_EID_SUPP_RATES; |
2103dec1 SW |
110 | *pos++ = min_t(int, 8, rates_n); |
111 | for (ri = 0; ri < sband->n_bitrates; ri++) { | |
112 | int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, | |
113 | 5 * (1 << shift)); | |
c3ffeab4 | 114 | u8 basic = 0; |
2103dec1 SW |
115 | if (!(rates & BIT(ri))) |
116 | continue; | |
117 | ||
118 | if (basic_rates & BIT(ri)) | |
c3ffeab4 | 119 | basic = 0x80; |
2103dec1 | 120 | *pos++ = basic | (u8) rate; |
93c75786 SW |
121 | if (++rates_added == 8) { |
122 | ri++; /* continue at next rate for EXT_SUPP_RATES */ | |
2103dec1 | 123 | break; |
93c75786 | 124 | } |
c3ffeab4 | 125 | } |
46900298 JB |
126 | |
127 | if (sband->band == IEEE80211_BAND_2GHZ) { | |
46900298 JB |
128 | *pos++ = WLAN_EID_DS_PARAMS; |
129 | *pos++ = 1; | |
d51b70ff SW |
130 | *pos++ = ieee80211_frequency_to_channel( |
131 | chandef->chan->center_freq); | |
46900298 JB |
132 | } |
133 | ||
46900298 JB |
134 | *pos++ = WLAN_EID_IBSS_PARAMS; |
135 | *pos++ = 2; | |
136 | /* FIX: set ATIM window based on scan results */ | |
137 | *pos++ = 0; | |
138 | *pos++ = 0; | |
139 | ||
cd7760e6 SW |
140 | if (csa_settings) { |
141 | *pos++ = WLAN_EID_CHANNEL_SWITCH; | |
142 | *pos++ = 3; | |
143 | *pos++ = csa_settings->block_tx ? 1 : 0; | |
144 | *pos++ = ieee80211_frequency_to_channel( | |
145 | csa_settings->chandef.chan->center_freq); | |
146 | sdata->csa_counter_offset_beacon = (pos - presp->head); | |
147 | *pos++ = csa_settings->count; | |
148 | } | |
149 | ||
2103dec1 SW |
150 | /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */ |
151 | if (rates_n > 8) { | |
46900298 | 152 | *pos++ = WLAN_EID_EXT_SUPP_RATES; |
2103dec1 SW |
153 | *pos++ = rates_n - 8; |
154 | for (; ri < sband->n_bitrates; ri++) { | |
155 | int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, | |
156 | 5 * (1 << shift)); | |
c3ffeab4 | 157 | u8 basic = 0; |
2103dec1 SW |
158 | if (!(rates & BIT(ri))) |
159 | continue; | |
160 | ||
161 | if (basic_rates & BIT(ri)) | |
c3ffeab4 | 162 | basic = 0x80; |
2103dec1 | 163 | *pos++ = basic | (u8) rate; |
c3ffeab4 | 164 | } |
46900298 JB |
165 | } |
166 | ||
c3ffeab4 JB |
167 | if (ifibss->ie_len) { |
168 | memcpy(pos, ifibss->ie, ifibss->ie_len); | |
169 | pos += ifibss->ie_len; | |
170 | } | |
af8cdcd8 | 171 | |
13c40c54 | 172 | /* add HT capability and information IEs */ |
d51b70ff SW |
173 | if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT && |
174 | chandef->width != NL80211_CHAN_WIDTH_5 && | |
175 | chandef->width != NL80211_CHAN_WIDTH_10 && | |
683b6d3b | 176 | sband->ht_cap.ht_supported) { |
822854b0 SW |
177 | struct ieee80211_sta_ht_cap ht_cap; |
178 | ||
179 | memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); | |
180 | ieee80211_apply_htcap_overrides(sdata, &ht_cap); | |
181 | ||
182 | pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); | |
0d894ec5 AN |
183 | /* |
184 | * Note: According to 802.11n-2009 9.13.3.1, HT Protection | |
185 | * field and RIFS Mode are reserved in IBSS mode, therefore | |
186 | * keep them at 0 | |
187 | */ | |
074d46d1 | 188 | pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap, |
d51b70ff | 189 | chandef, 0); |
13c40c54 AS |
190 | } |
191 | ||
32c5057b | 192 | if (local->hw.queues >= IEEE80211_NUM_ACS) { |
9eba6125 BR |
193 | *pos++ = WLAN_EID_VENDOR_SPECIFIC; |
194 | *pos++ = 7; /* len */ | |
195 | *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */ | |
196 | *pos++ = 0x50; | |
197 | *pos++ = 0xf2; | |
198 | *pos++ = 2; /* WME */ | |
199 | *pos++ = 0; /* WME info */ | |
200 | *pos++ = 1; /* WME ver */ | |
201 | *pos++ = 0; /* U-APSD no in use */ | |
202 | } | |
203 | ||
c3ffeab4 JB |
204 | presp->head_len = pos - presp->head; |
205 | if (WARN_ON(presp->head_len > frame_len)) | |
d51b70ff SW |
206 | goto error; |
207 | ||
208 | return presp; | |
209 | error: | |
210 | kfree(presp); | |
211 | return NULL; | |
212 | } | |
213 | ||
214 | static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, | |
215 | const u8 *bssid, const int beacon_int, | |
b35c8097 | 216 | struct cfg80211_chan_def *req_chandef, |
d51b70ff SW |
217 | const u32 basic_rates, |
218 | const u16 capability, u64 tsf, | |
219 | bool creator) | |
220 | { | |
221 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
222 | struct ieee80211_local *local = sdata->local; | |
223 | struct ieee80211_supported_band *sband; | |
224 | struct ieee80211_mgmt *mgmt; | |
225 | struct cfg80211_bss *bss; | |
226 | u32 bss_change; | |
227 | struct cfg80211_chan_def chandef; | |
b35c8097 | 228 | struct ieee80211_channel *chan; |
d51b70ff SW |
229 | struct beacon_data *presp; |
230 | enum nl80211_bss_scan_width scan_width; | |
231 | bool have_higher_than_11mbit; | |
8e8d347d | 232 | bool radar_required = false; |
55fff501 | 233 | int err; |
d51b70ff SW |
234 | |
235 | sdata_assert_lock(sdata); | |
236 | ||
237 | /* Reset own TSF to allow time synchronization work. */ | |
238 | drv_reset_tsf(local, sdata); | |
239 | ||
240 | if (!ether_addr_equal(ifibss->bssid, bssid)) | |
241 | sta_info_flush(sdata); | |
242 | ||
243 | /* if merging, indicate to driver that we leave the old IBSS */ | |
244 | if (sdata->vif.bss_conf.ibss_joined) { | |
245 | sdata->vif.bss_conf.ibss_joined = false; | |
246 | sdata->vif.bss_conf.ibss_creator = false; | |
247 | sdata->vif.bss_conf.enable_beacon = false; | |
248 | netif_carrier_off(sdata->dev); | |
249 | ieee80211_bss_info_change_notify(sdata, | |
250 | BSS_CHANGED_IBSS | | |
251 | BSS_CHANGED_BEACON_ENABLED); | |
55fff501 | 252 | drv_leave_ibss(local, sdata); |
d51b70ff SW |
253 | } |
254 | ||
255 | presp = rcu_dereference_protected(ifibss->presp, | |
256 | lockdep_is_held(&sdata->wdev.mtx)); | |
257 | rcu_assign_pointer(ifibss->presp, NULL); | |
258 | if (presp) | |
259 | kfree_rcu(presp, rcu_head); | |
260 | ||
261 | sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0; | |
262 | ||
b35c8097 JL |
263 | /* make a copy of the chandef, it could be modified below. */ |
264 | chandef = *req_chandef; | |
265 | chan = chandef.chan; | |
d51b70ff SW |
266 | if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) { |
267 | if (chandef.width == NL80211_CHAN_WIDTH_5 || | |
268 | chandef.width == NL80211_CHAN_WIDTH_10 || | |
269 | chandef.width == NL80211_CHAN_WIDTH_20_NOHT || | |
270 | chandef.width == NL80211_CHAN_WIDTH_20) { | |
271 | sdata_info(sdata, | |
272 | "Failed to join IBSS, beacons forbidden\n"); | |
273 | return; | |
274 | } | |
275 | chandef.width = NL80211_CHAN_WIDTH_20; | |
276 | chandef.center_freq1 = chan->center_freq; | |
8e8d347d SW |
277 | /* check again for downgraded chandef */ |
278 | if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) { | |
279 | sdata_info(sdata, | |
280 | "Failed to join IBSS, beacons forbidden\n"); | |
281 | return; | |
282 | } | |
283 | } | |
284 | ||
285 | err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, | |
286 | &chandef); | |
287 | if (err > 0) { | |
288 | if (!ifibss->userspace_handles_dfs) { | |
289 | sdata_info(sdata, | |
290 | "Failed to join IBSS, DFS channel without control program\n"); | |
291 | return; | |
292 | } | |
293 | radar_required = true; | |
d51b70ff SW |
294 | } |
295 | ||
34a3740d | 296 | mutex_lock(&local->mtx); |
d51b70ff SW |
297 | if (ieee80211_vif_use_channel(sdata, &chandef, |
298 | ifibss->fixed_channel ? | |
299 | IEEE80211_CHANCTX_SHARED : | |
300 | IEEE80211_CHANCTX_EXCLUSIVE)) { | |
301 | sdata_info(sdata, "Failed to join IBSS, no channel context\n"); | |
34a3740d | 302 | mutex_unlock(&local->mtx); |
d51b70ff SW |
303 | return; |
304 | } | |
cc901de1 | 305 | sdata->radar_required = radar_required; |
34a3740d | 306 | mutex_unlock(&local->mtx); |
d51b70ff SW |
307 | |
308 | memcpy(ifibss->bssid, bssid, ETH_ALEN); | |
309 | ||
310 | sband = local->hw.wiphy->bands[chan->band]; | |
311 | ||
312 | presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates, | |
313 | capability, tsf, &chandef, | |
cd7760e6 | 314 | &have_higher_than_11mbit, NULL); |
d51b70ff | 315 | if (!presp) |
c3ffeab4 JB |
316 | return; |
317 | ||
318 | rcu_assign_pointer(ifibss->presp, presp); | |
d51b70ff | 319 | mgmt = (void *)presp->head; |
46900298 | 320 | |
d6a83228 | 321 | sdata->vif.bss_conf.enable_beacon = true; |
2d0ddec5 | 322 | sdata->vif.bss_conf.beacon_int = beacon_int; |
fbd2c8dc | 323 | sdata->vif.bss_conf.basic_rates = basic_rates; |
0ca54f6c MP |
324 | sdata->vif.bss_conf.ssid_len = ifibss->ssid_len; |
325 | memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len); | |
2d0ddec5 JB |
326 | bss_change = BSS_CHANGED_BEACON_INT; |
327 | bss_change |= ieee80211_reset_erp_info(sdata); | |
328 | bss_change |= BSS_CHANGED_BSSID; | |
329 | bss_change |= BSS_CHANGED_BEACON; | |
330 | bss_change |= BSS_CHANGED_BEACON_ENABLED; | |
392cfdb1 | 331 | bss_change |= BSS_CHANGED_BASIC_RATES; |
13c40c54 | 332 | bss_change |= BSS_CHANGED_HT; |
8fc214ba | 333 | bss_change |= BSS_CHANGED_IBSS; |
0ca54f6c | 334 | bss_change |= BSS_CHANGED_SSID; |
2f91a967 SW |
335 | |
336 | /* | |
337 | * In 5 GHz/802.11a, we can always use short slot time. | |
338 | * (IEEE 802.11-2012 18.3.8.7) | |
339 | * | |
340 | * In 2.4GHz, we must always use long slots in IBSS for compatibility | |
341 | * reasons. | |
342 | * (IEEE 802.11-2012 19.4.5) | |
343 | * | |
344 | * HT follows these specifications (IEEE 802.11-2012 20.3.18) | |
345 | */ | |
346 | sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ; | |
347 | bss_change |= BSS_CHANGED_ERP_SLOT; | |
348 | ||
2ec9c1f6 SW |
349 | /* cf. IEEE 802.11 9.2.12 */ |
350 | if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit) | |
351 | sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; | |
352 | else | |
353 | sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; | |
354 | ||
55fff501 JB |
355 | ieee80211_set_wmm_default(sdata, true); |
356 | ||
8fc214ba | 357 | sdata->vif.bss_conf.ibss_joined = true; |
c13a765b | 358 | sdata->vif.bss_conf.ibss_creator = creator; |
46900298 | 359 | |
55fff501 JB |
360 | err = drv_join_ibss(local, sdata); |
361 | if (err) { | |
362 | sdata->vif.bss_conf.ibss_joined = false; | |
363 | sdata->vif.bss_conf.ibss_creator = false; | |
364 | sdata->vif.bss_conf.enable_beacon = false; | |
365 | sdata->vif.bss_conf.ssid_len = 0; | |
366 | RCU_INIT_POINTER(ifibss->presp, NULL); | |
367 | kfree_rcu(presp, rcu_head); | |
34a3740d | 368 | mutex_lock(&local->mtx); |
55fff501 | 369 | ieee80211_vif_release_channel(sdata); |
34a3740d | 370 | mutex_unlock(&local->mtx); |
55fff501 JB |
371 | sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n", |
372 | err); | |
373 | return; | |
374 | } | |
375 | ||
376 | ieee80211_bss_info_change_notify(sdata, bss_change); | |
46900298 | 377 | |
46900298 | 378 | ifibss->state = IEEE80211_IBSS_MLME_JOINED; |
af8cdcd8 JB |
379 | mod_timer(&ifibss->timer, |
380 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 | 381 | |
7ca15a0a SW |
382 | scan_width = cfg80211_chandef_to_scan_width(&chandef); |
383 | bss = cfg80211_inform_bss_width_frame(local->hw.wiphy, chan, | |
384 | scan_width, mgmt, | |
385 | presp->head_len, 0, GFP_KERNEL); | |
5b112d3d | 386 | cfg80211_put_bss(local->hw.wiphy, bss); |
86a2ea41 | 387 | netif_carrier_on(sdata->dev); |
af8cdcd8 | 388 | cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL); |
46900298 JB |
389 | } |
390 | ||
af8cdcd8 JB |
391 | static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
392 | struct ieee80211_bss *bss) | |
46900298 | 393 | { |
0c1ad2ca JB |
394 | struct cfg80211_bss *cbss = |
395 | container_of((void *)bss, struct cfg80211_bss, priv); | |
b59066a2 | 396 | struct ieee80211_supported_band *sband; |
75a423f4 | 397 | struct cfg80211_chan_def chandef; |
b59066a2 JB |
398 | u32 basic_rates; |
399 | int i, j; | |
0c1ad2ca | 400 | u16 beacon_int = cbss->beacon_interval; |
8cef2c9d | 401 | const struct cfg80211_bss_ies *ies; |
75a423f4 | 402 | enum nl80211_channel_type chan_type; |
8cef2c9d | 403 | u64 tsf; |
2103dec1 SW |
404 | u32 rate_flags; |
405 | int shift; | |
57c4d7b4 | 406 | |
8d61ffa5 | 407 | sdata_assert_lock(sdata); |
7a17a33c | 408 | |
57c4d7b4 JB |
409 | if (beacon_int < 10) |
410 | beacon_int = 10; | |
411 | ||
75a423f4 SW |
412 | switch (sdata->u.ibss.chandef.width) { |
413 | case NL80211_CHAN_WIDTH_20_NOHT: | |
414 | case NL80211_CHAN_WIDTH_20: | |
415 | case NL80211_CHAN_WIDTH_40: | |
416 | chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef); | |
417 | cfg80211_chandef_create(&chandef, cbss->channel, chan_type); | |
418 | break; | |
419 | case NL80211_CHAN_WIDTH_5: | |
420 | case NL80211_CHAN_WIDTH_10: | |
421 | cfg80211_chandef_create(&chandef, cbss->channel, | |
422 | NL80211_CHAN_WIDTH_20_NOHT); | |
423 | chandef.width = sdata->u.ibss.chandef.width; | |
424 | break; | |
425 | default: | |
426 | /* fall back to 20 MHz for unsupported modes */ | |
427 | cfg80211_chandef_create(&chandef, cbss->channel, | |
428 | NL80211_CHAN_WIDTH_20_NOHT); | |
429 | break; | |
430 | } | |
431 | ||
0c1ad2ca | 432 | sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; |
2103dec1 SW |
433 | rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef); |
434 | shift = ieee80211_vif_get_shift(&sdata->vif); | |
b59066a2 JB |
435 | |
436 | basic_rates = 0; | |
437 | ||
438 | for (i = 0; i < bss->supp_rates_len; i++) { | |
2103dec1 | 439 | int rate = bss->supp_rates[i] & 0x7f; |
b59066a2 JB |
440 | bool is_basic = !!(bss->supp_rates[i] & 0x80); |
441 | ||
442 | for (j = 0; j < sband->n_bitrates; j++) { | |
2103dec1 SW |
443 | int brate; |
444 | if ((rate_flags & sband->bitrates[j].flags) | |
445 | != rate_flags) | |
446 | continue; | |
447 | ||
448 | brate = DIV_ROUND_UP(sband->bitrates[j].bitrate, | |
449 | 5 * (1 << shift)); | |
450 | if (brate == rate) { | |
b59066a2 JB |
451 | if (is_basic) |
452 | basic_rates |= BIT(j); | |
453 | break; | |
454 | } | |
455 | } | |
456 | } | |
457 | ||
8cef2c9d JB |
458 | rcu_read_lock(); |
459 | ies = rcu_dereference(cbss->ies); | |
460 | tsf = ies->tsf; | |
461 | rcu_read_unlock(); | |
462 | ||
0c1ad2ca | 463 | __ieee80211_sta_join_ibss(sdata, cbss->bssid, |
57c4d7b4 | 464 | beacon_int, |
75a423f4 | 465 | &chandef, |
b59066a2 | 466 | basic_rates, |
0c1ad2ca | 467 | cbss->capability, |
8cef2c9d | 468 | tsf, false); |
46900298 JB |
469 | } |
470 | ||
cd7760e6 SW |
471 | int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata, |
472 | struct cfg80211_csa_settings *csa_settings) | |
473 | { | |
474 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
475 | struct beacon_data *presp, *old_presp; | |
476 | struct cfg80211_bss *cbss; | |
477 | const struct cfg80211_bss_ies *ies; | |
478 | u16 capability; | |
479 | u64 tsf; | |
480 | int ret = 0; | |
481 | ||
482 | sdata_assert_lock(sdata); | |
483 | ||
484 | capability = WLAN_CAPABILITY_IBSS; | |
485 | ||
486 | if (ifibss->privacy) | |
487 | capability |= WLAN_CAPABILITY_PRIVACY; | |
488 | ||
489 | cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan, | |
490 | ifibss->bssid, ifibss->ssid, | |
491 | ifibss->ssid_len, WLAN_CAPABILITY_IBSS | | |
492 | WLAN_CAPABILITY_PRIVACY, | |
493 | capability); | |
494 | ||
495 | if (WARN_ON(!cbss)) { | |
496 | ret = -EINVAL; | |
497 | goto out; | |
498 | } | |
499 | ||
500 | rcu_read_lock(); | |
501 | ies = rcu_dereference(cbss->ies); | |
502 | tsf = ies->tsf; | |
503 | rcu_read_unlock(); | |
504 | cfg80211_put_bss(sdata->local->hw.wiphy, cbss); | |
505 | ||
506 | old_presp = rcu_dereference_protected(ifibss->presp, | |
507 | lockdep_is_held(&sdata->wdev.mtx)); | |
508 | ||
509 | presp = ieee80211_ibss_build_presp(sdata, | |
510 | sdata->vif.bss_conf.beacon_int, | |
511 | sdata->vif.bss_conf.basic_rates, | |
512 | capability, tsf, &ifibss->chandef, | |
513 | NULL, csa_settings); | |
514 | if (!presp) { | |
515 | ret = -ENOMEM; | |
516 | goto out; | |
517 | } | |
518 | ||
519 | rcu_assign_pointer(ifibss->presp, presp); | |
520 | if (old_presp) | |
521 | kfree_rcu(old_presp, rcu_head); | |
522 | ||
dddd586b | 523 | return BSS_CHANGED_BEACON; |
cd7760e6 SW |
524 | out: |
525 | return ret; | |
526 | } | |
527 | ||
528 | int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata) | |
529 | { | |
530 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
531 | struct cfg80211_bss *cbss; | |
faf046e7 | 532 | int err, changed = 0; |
cd7760e6 SW |
533 | u16 capability; |
534 | ||
bafdc614 SW |
535 | sdata_assert_lock(sdata); |
536 | ||
cd7760e6 SW |
537 | /* update cfg80211 bss information with the new channel */ |
538 | if (!is_zero_ether_addr(ifibss->bssid)) { | |
539 | capability = WLAN_CAPABILITY_IBSS; | |
540 | ||
541 | if (ifibss->privacy) | |
542 | capability |= WLAN_CAPABILITY_PRIVACY; | |
543 | ||
544 | cbss = cfg80211_get_bss(sdata->local->hw.wiphy, | |
545 | ifibss->chandef.chan, | |
546 | ifibss->bssid, ifibss->ssid, | |
547 | ifibss->ssid_len, WLAN_CAPABILITY_IBSS | | |
548 | WLAN_CAPABILITY_PRIVACY, | |
549 | capability); | |
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; | |
690 | int active_ibss; | |
691 | u16 capability; | |
692 | ||
693 | active_ibss = ieee80211_sta_active_ibss(sdata); | |
694 | ||
695 | if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) { | |
696 | capability = WLAN_CAPABILITY_IBSS; | |
697 | ||
698 | if (ifibss->privacy) | |
699 | capability |= WLAN_CAPABILITY_PRIVACY; | |
700 | ||
701 | cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan, | |
702 | ifibss->bssid, ifibss->ssid, | |
703 | ifibss->ssid_len, WLAN_CAPABILITY_IBSS | | |
704 | WLAN_CAPABILITY_PRIVACY, | |
705 | capability); | |
706 | ||
707 | if (cbss) { | |
708 | cfg80211_unlink_bss(local->hw.wiphy, cbss); | |
709 | cfg80211_put_bss(sdata->local->hw.wiphy, cbss); | |
710 | } | |
711 | } | |
712 | ||
713 | ifibss->state = IEEE80211_IBSS_MLME_SEARCH; | |
714 | ||
715 | sta_info_flush(sdata); | |
716 | ||
717 | spin_lock_bh(&ifibss->incomplete_lock); | |
718 | while (!list_empty(&ifibss->incomplete_stations)) { | |
719 | sta = list_first_entry(&ifibss->incomplete_stations, | |
720 | struct sta_info, list); | |
721 | list_del(&sta->list); | |
722 | spin_unlock_bh(&ifibss->incomplete_lock); | |
723 | ||
724 | sta_info_free(local, sta); | |
725 | spin_lock_bh(&ifibss->incomplete_lock); | |
726 | } | |
727 | spin_unlock_bh(&ifibss->incomplete_lock); | |
728 | ||
729 | netif_carrier_off(sdata->dev); | |
730 | ||
731 | sdata->vif.bss_conf.ibss_joined = false; | |
732 | sdata->vif.bss_conf.ibss_creator = false; | |
733 | sdata->vif.bss_conf.enable_beacon = false; | |
734 | sdata->vif.bss_conf.ssid_len = 0; | |
735 | ||
736 | /* remove beacon */ | |
737 | presp = rcu_dereference_protected(ifibss->presp, | |
738 | lockdep_is_held(&sdata->wdev.mtx)); | |
739 | RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); | |
740 | if (presp) | |
741 | kfree_rcu(presp, rcu_head); | |
742 | ||
743 | clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); | |
744 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | | |
745 | BSS_CHANGED_IBSS); | |
55fff501 | 746 | drv_leave_ibss(local, sdata); |
34a3740d | 747 | mutex_lock(&local->mtx); |
871a4180 | 748 | ieee80211_vif_release_channel(sdata); |
34a3740d | 749 | mutex_unlock(&local->mtx); |
871a4180 SW |
750 | } |
751 | ||
cd7760e6 SW |
752 | static void ieee80211_csa_connection_drop_work(struct work_struct *work) |
753 | { | |
754 | struct ieee80211_sub_if_data *sdata = | |
755 | container_of(work, struct ieee80211_sub_if_data, | |
756 | u.ibss.csa_connection_drop_work); | |
757 | ||
6f07d216 LC |
758 | sdata_lock(sdata); |
759 | ||
cd7760e6 SW |
760 | ieee80211_ibss_disconnect(sdata); |
761 | synchronize_rcu(); | |
762 | skb_queue_purge(&sdata->skb_queue); | |
763 | ||
764 | /* trigger a scan to find another IBSS network to join */ | |
765 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); | |
6f07d216 LC |
766 | |
767 | sdata_unlock(sdata); | |
cd7760e6 SW |
768 | } |
769 | ||
8e8d347d SW |
770 | static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata) |
771 | { | |
772 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
773 | int err; | |
774 | ||
775 | /* if the current channel is a DFS channel, mark the channel as | |
776 | * unavailable. | |
777 | */ | |
778 | err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, | |
779 | &ifibss->chandef); | |
780 | if (err > 0) | |
781 | cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef, | |
782 | GFP_ATOMIC); | |
783 | } | |
784 | ||
cd7760e6 SW |
785 | static bool |
786 | ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata, | |
787 | struct ieee802_11_elems *elems, | |
788 | bool beacon) | |
789 | { | |
790 | struct cfg80211_csa_settings params; | |
c0f17eb9 | 791 | struct ieee80211_csa_ie csa_ie; |
cd7760e6 | 792 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
cd7760e6 | 793 | enum nl80211_channel_type ch_type; |
82a8e17d | 794 | int err; |
cd7760e6 | 795 | u32 sta_flags; |
cd7760e6 | 796 | |
dbd72850 MK |
797 | sdata_assert_lock(sdata); |
798 | ||
cd7760e6 SW |
799 | sta_flags = IEEE80211_STA_DISABLE_VHT; |
800 | switch (ifibss->chandef.width) { | |
801 | case NL80211_CHAN_WIDTH_5: | |
802 | case NL80211_CHAN_WIDTH_10: | |
803 | case NL80211_CHAN_WIDTH_20_NOHT: | |
804 | sta_flags |= IEEE80211_STA_DISABLE_HT; | |
805 | /* fall through */ | |
806 | case NL80211_CHAN_WIDTH_20: | |
807 | sta_flags |= IEEE80211_STA_DISABLE_40MHZ; | |
808 | break; | |
809 | default: | |
810 | break; | |
811 | } | |
812 | ||
813 | memset(¶ms, 0, sizeof(params)); | |
c0f17eb9 | 814 | memset(&csa_ie, 0, sizeof(csa_ie)); |
cd7760e6 SW |
815 | err = ieee80211_parse_ch_switch_ie(sdata, elems, beacon, |
816 | ifibss->chandef.chan->band, | |
c0f17eb9 | 817 | sta_flags, ifibss->bssid, &csa_ie); |
cd7760e6 SW |
818 | /* can't switch to destination channel, fail */ |
819 | if (err < 0) | |
820 | goto disconnect; | |
821 | ||
822 | /* did not contain a CSA */ | |
823 | if (err) | |
824 | return false; | |
825 | ||
0834ae3c SW |
826 | /* channel switch is not supported, disconnect */ |
827 | if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH)) | |
828 | goto disconnect; | |
829 | ||
c0f17eb9 CYY |
830 | params.count = csa_ie.count; |
831 | params.chandef = csa_ie.chandef; | |
832 | ||
cd7760e6 SW |
833 | switch (ifibss->chandef.width) { |
834 | case NL80211_CHAN_WIDTH_20_NOHT: | |
835 | case NL80211_CHAN_WIDTH_20: | |
836 | case NL80211_CHAN_WIDTH_40: | |
837 | /* keep our current HT mode (HT20/HT40+/HT40-), even if | |
838 | * another mode has been announced. The mode is not adopted | |
839 | * within the beacon while doing CSA and we should therefore | |
840 | * keep the mode which we announce. | |
841 | */ | |
842 | ch_type = cfg80211_get_chandef_type(&ifibss->chandef); | |
843 | cfg80211_chandef_create(¶ms.chandef, params.chandef.chan, | |
844 | ch_type); | |
845 | break; | |
846 | case NL80211_CHAN_WIDTH_5: | |
847 | case NL80211_CHAN_WIDTH_10: | |
848 | if (params.chandef.width != ifibss->chandef.width) { | |
849 | sdata_info(sdata, | |
850 | "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", | |
851 | ifibss->bssid, | |
852 | params.chandef.chan->center_freq, | |
853 | params.chandef.width, | |
854 | params.chandef.center_freq1, | |
855 | params.chandef.center_freq2); | |
856 | goto disconnect; | |
857 | } | |
858 | break; | |
859 | default: | |
860 | /* should not happen, sta_flags should prevent VHT modes. */ | |
861 | WARN_ON(1); | |
862 | goto disconnect; | |
863 | } | |
864 | ||
8e8d347d | 865 | if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef)) { |
cd7760e6 SW |
866 | sdata_info(sdata, |
867 | "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", | |
868 | ifibss->bssid, | |
869 | params.chandef.chan->center_freq, | |
870 | params.chandef.width, | |
871 | params.chandef.center_freq1, | |
872 | params.chandef.center_freq2); | |
873 | goto disconnect; | |
874 | } | |
875 | ||
876 | err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, | |
877 | ¶ms.chandef); | |
878 | if (err < 0) | |
879 | goto disconnect; | |
880 | if (err) { | |
8e8d347d SW |
881 | /* IBSS-DFS only allowed with a control program */ |
882 | if (!ifibss->userspace_handles_dfs) | |
883 | goto disconnect; | |
cd7760e6 | 884 | |
8e8d347d | 885 | params.radar_required = true; |
cd7760e6 SW |
886 | } |
887 | ||
82a8e17d LC |
888 | if (cfg80211_chandef_identical(¶ms.chandef, |
889 | &sdata->vif.bss_conf.chandef)) { | |
890 | ibss_dbg(sdata, | |
891 | "received csa with an identical chandef, ignoring\n"); | |
892 | return true; | |
cd7760e6 | 893 | } |
cd7760e6 SW |
894 | |
895 | /* all checks done, now perform the channel switch. */ | |
896 | ibss_dbg(sdata, | |
897 | "received channel switch announcement to go to channel %d MHz\n", | |
898 | params.chandef.chan->center_freq); | |
899 | ||
c0f17eb9 | 900 | params.block_tx = !!csa_ie.mode; |
cd7760e6 | 901 | |
82a8e17d LC |
902 | if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev, |
903 | ¶ms)) | |
904 | goto disconnect; | |
cd7760e6 | 905 | |
8e8d347d SW |
906 | ieee80211_ibss_csa_mark_radar(sdata); |
907 | ||
cd7760e6 SW |
908 | return true; |
909 | disconnect: | |
910 | ibss_dbg(sdata, "Can't handle channel switch, disconnect\n"); | |
911 | ieee80211_queue_work(&sdata->local->hw, | |
912 | &ifibss->csa_connection_drop_work); | |
913 | ||
8e8d347d SW |
914 | ieee80211_ibss_csa_mark_radar(sdata); |
915 | ||
cd7760e6 SW |
916 | return true; |
917 | } | |
918 | ||
919 | static void | |
920 | ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata, | |
921 | struct ieee80211_mgmt *mgmt, size_t len, | |
922 | struct ieee80211_rx_status *rx_status, | |
923 | struct ieee802_11_elems *elems) | |
924 | { | |
925 | int required_len; | |
926 | ||
927 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
928 | return; | |
929 | ||
930 | /* CSA is the only action we handle for now */ | |
931 | if (mgmt->u.action.u.measurement.action_code != | |
932 | WLAN_ACTION_SPCT_CHL_SWITCH) | |
933 | return; | |
934 | ||
935 | required_len = IEEE80211_MIN_ACTION_SIZE + | |
936 | sizeof(mgmt->u.action.u.chan_switch); | |
937 | if (len < required_len) | |
938 | return; | |
939 | ||
82a8e17d LC |
940 | if (!sdata->vif.csa_active) |
941 | ieee80211_ibss_process_chanswitch(sdata, elems, false); | |
cd7760e6 SW |
942 | } |
943 | ||
2cc59e78 AQ |
944 | static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata, |
945 | struct ieee80211_mgmt *mgmt, | |
946 | size_t len) | |
947 | { | |
948 | u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code); | |
949 | ||
950 | if (len < IEEE80211_DEAUTH_FRAME_LEN) | |
951 | return; | |
952 | ||
953 | ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n", | |
954 | mgmt->sa, mgmt->da, mgmt->bssid, reason); | |
955 | sta_info_destroy_addr(sdata, mgmt->sa); | |
956 | } | |
957 | ||
6d810f10 AQ |
958 | static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, |
959 | struct ieee80211_mgmt *mgmt, | |
960 | size_t len) | |
961 | { | |
962 | u16 auth_alg, auth_transaction; | |
963 | ||
8d61ffa5 | 964 | sdata_assert_lock(sdata); |
6d810f10 AQ |
965 | |
966 | if (len < 24 + 6) | |
967 | return; | |
968 | ||
969 | auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); | |
970 | auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); | |
971 | ||
bdcbd8e0 JB |
972 | ibss_dbg(sdata, |
973 | "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n", | |
974 | mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction); | |
7bed2050 AQ |
975 | |
976 | if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) | |
977 | return; | |
978 | ||
6d810f10 AQ |
979 | /* |
980 | * IEEE 802.11 standard does not require authentication in IBSS | |
981 | * networks and most implementations do not seem to use it. | |
982 | * However, try to reply to authentication attempts if someone | |
983 | * has actually implemented this. | |
984 | */ | |
700e8ea6 | 985 | ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0, |
1672c0e3 | 986 | mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0); |
8bf11d8d JB |
987 | } |
988 | ||
46900298 | 989 | static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, |
d45c4172 | 990 | struct ieee80211_mgmt *mgmt, size_t len, |
46900298 | 991 | struct ieee80211_rx_status *rx_status, |
d45c4172 | 992 | struct ieee802_11_elems *elems) |
46900298 JB |
993 | { |
994 | struct ieee80211_local *local = sdata->local; | |
995 | int freq; | |
0c1ad2ca | 996 | struct cfg80211_bss *cbss; |
46900298 JB |
997 | struct ieee80211_bss *bss; |
998 | struct sta_info *sta; | |
999 | struct ieee80211_channel *channel; | |
1000 | u64 beacon_timestamp, rx_timestamp; | |
1001 | u32 supp_rates = 0; | |
1002 | enum ieee80211_band band = rx_status->band; | |
74608aca | 1003 | enum nl80211_bss_scan_width scan_width; |
13c40c54 AS |
1004 | struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; |
1005 | bool rates_updated = false; | |
46900298 | 1006 | |
1cd8e88e | 1007 | if (elems->ds_params) |
59eb21a6 BR |
1008 | freq = ieee80211_channel_to_frequency(elems->ds_params[0], |
1009 | band); | |
46900298 JB |
1010 | else |
1011 | freq = rx_status->freq; | |
1012 | ||
1013 | channel = ieee80211_get_channel(local->hw.wiphy, freq); | |
1014 | ||
1015 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
1016 | return; | |
1017 | ||
9eba6125 | 1018 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC && |
b203ca39 | 1019 | ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) { |
46900298 JB |
1020 | |
1021 | rcu_read_lock(); | |
abe60632 | 1022 | sta = sta_info_get(sdata, mgmt->sa); |
46900298 | 1023 | |
9eba6125 | 1024 | if (elems->supp_rates) { |
2103dec1 | 1025 | supp_rates = ieee80211_sta_get_rates(sdata, elems, |
9ebb61a2 | 1026 | band, NULL); |
9eba6125 BR |
1027 | if (sta) { |
1028 | u32 prev_rates; | |
1029 | ||
1030 | prev_rates = sta->sta.supp_rates[band]; | |
1031 | /* make sure mandatory rates are always added */ | |
74608aca SW |
1032 | scan_width = NL80211_BSS_CHAN_WIDTH_20; |
1033 | if (rx_status->flag & RX_FLAG_5MHZ) | |
1034 | scan_width = NL80211_BSS_CHAN_WIDTH_5; | |
1035 | if (rx_status->flag & RX_FLAG_10MHZ) | |
1036 | scan_width = NL80211_BSS_CHAN_WIDTH_10; | |
46900298 | 1037 | |
74608aca SW |
1038 | sta->sta.supp_rates[band] = supp_rates | |
1039 | ieee80211_mandatory_rates(sband, | |
1040 | scan_width); | |
9eba6125 | 1041 | if (sta->sta.supp_rates[band] != prev_rates) { |
bdcbd8e0 JB |
1042 | ibss_dbg(sdata, |
1043 | "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", | |
1044 | sta->sta.addr, prev_rates, | |
1045 | sta->sta.supp_rates[band]); | |
13c40c54 | 1046 | rates_updated = true; |
9eba6125 | 1047 | } |
8bf11d8d JB |
1048 | } else { |
1049 | rcu_read_unlock(); | |
9eba6125 | 1050 | sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, |
52874a5e | 1051 | mgmt->sa, supp_rates); |
8bf11d8d | 1052 | } |
34e89507 | 1053 | } |
9eba6125 BR |
1054 | |
1055 | if (sta && elems->wmm_info) | |
c2c98fde | 1056 | set_sta_flag(sta, WLAN_STA_WME); |
9eba6125 | 1057 | |
074d46d1 | 1058 | if (sta && elems->ht_operation && elems->ht_cap_elem && |
3aede78a SW |
1059 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT && |
1060 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 && | |
1061 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) { | |
13c40c54 | 1062 | /* we both use HT */ |
e1a0c6b3 | 1063 | struct ieee80211_ht_cap htcap_ie; |
4bf88530 JB |
1064 | struct cfg80211_chan_def chandef; |
1065 | ||
1066 | ieee80211_ht_oper_to_chandef(channel, | |
1067 | elems->ht_operation, | |
1068 | &chandef); | |
13c40c54 | 1069 | |
e1a0c6b3 | 1070 | memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie)); |
13c40c54 AS |
1071 | |
1072 | /* | |
1073 | * fall back to HT20 if we don't use or use | |
1074 | * the other extension channel | |
1075 | */ | |
3aede78a SW |
1076 | if (chandef.center_freq1 != |
1077 | sdata->u.ibss.chandef.center_freq1) | |
e1a0c6b3 JB |
1078 | htcap_ie.cap_info &= |
1079 | cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40); | |
1080 | ||
1081 | rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap( | |
1082 | sdata, sband, &htcap_ie, sta); | |
13c40c54 AS |
1083 | } |
1084 | ||
e687f61e AQ |
1085 | if (sta && rates_updated) { |
1086 | drv_sta_rc_update(local, sdata, &sta->sta, | |
1087 | IEEE80211_RC_SUPP_RATES_CHANGED); | |
13c40c54 | 1088 | rate_control_rate_init(sta); |
e687f61e | 1089 | } |
13c40c54 | 1090 | |
9eba6125 | 1091 | rcu_read_unlock(); |
46900298 JB |
1092 | } |
1093 | ||
1094 | bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, | |
d45c4172 | 1095 | channel); |
46900298 JB |
1096 | if (!bss) |
1097 | return; | |
1098 | ||
0c1ad2ca JB |
1099 | cbss = container_of((void *)bss, struct cfg80211_bss, priv); |
1100 | ||
8cef2c9d JB |
1101 | /* same for beacon and probe response */ |
1102 | beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp); | |
46900298 JB |
1103 | |
1104 | /* check if we need to merge IBSS */ | |
1105 | ||
46900298 | 1106 | /* not an IBSS */ |
0c1ad2ca | 1107 | if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) |
46900298 JB |
1108 | goto put_bss; |
1109 | ||
1110 | /* different channel */ | |
55de908a | 1111 | if (sdata->u.ibss.fixed_channel && |
3aede78a | 1112 | sdata->u.ibss.chandef.chan != cbss->channel) |
46900298 JB |
1113 | goto put_bss; |
1114 | ||
1115 | /* different SSID */ | |
1116 | if (elems->ssid_len != sdata->u.ibss.ssid_len || | |
1117 | memcmp(elems->ssid, sdata->u.ibss.ssid, | |
1118 | sdata->u.ibss.ssid_len)) | |
1119 | goto put_bss; | |
1120 | ||
cd7760e6 | 1121 | /* process channel switch */ |
82a8e17d LC |
1122 | if (sdata->vif.csa_active || |
1123 | ieee80211_ibss_process_chanswitch(sdata, elems, true)) | |
cd7760e6 SW |
1124 | goto put_bss; |
1125 | ||
34e8f082 | 1126 | /* same BSSID */ |
b203ca39 | 1127 | if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) |
34e8f082 AF |
1128 | goto put_bss; |
1129 | ||
cd7760e6 SW |
1130 | /* we use a fixed BSSID */ |
1131 | if (sdata->u.ibss.fixed_bssid) | |
1132 | goto put_bss; | |
1133 | ||
f4bda337 TP |
1134 | if (ieee80211_have_rx_timestamp(rx_status)) { |
1135 | /* time when timestamp field was received */ | |
1136 | rx_timestamp = | |
1137 | ieee80211_calculate_rx_timestamp(local, rx_status, | |
1138 | len + FCS_LEN, 24); | |
24487981 JB |
1139 | } else { |
1140 | /* | |
1141 | * second best option: get current TSF | |
1142 | * (will return -1 if not supported) | |
1143 | */ | |
37a41b4a | 1144 | rx_timestamp = drv_get_tsf(local, sdata); |
24487981 | 1145 | } |
46900298 | 1146 | |
bdcbd8e0 JB |
1147 | ibss_dbg(sdata, |
1148 | "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", | |
1149 | mgmt->sa, mgmt->bssid, | |
1150 | (unsigned long long)rx_timestamp, | |
1151 | (unsigned long long)beacon_timestamp, | |
1152 | (unsigned long long)(rx_timestamp - beacon_timestamp), | |
1153 | jiffies); | |
46900298 JB |
1154 | |
1155 | if (beacon_timestamp > rx_timestamp) { | |
bdcbd8e0 JB |
1156 | ibss_dbg(sdata, |
1157 | "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", | |
1158 | mgmt->bssid); | |
46900298 | 1159 | ieee80211_sta_join_ibss(sdata, bss); |
2103dec1 | 1160 | supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL); |
34e89507 | 1161 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, |
52874a5e | 1162 | supp_rates); |
8bf11d8d | 1163 | rcu_read_unlock(); |
46900298 JB |
1164 | } |
1165 | ||
1166 | put_bss: | |
1167 | ieee80211_rx_bss_put(local, bss); | |
1168 | } | |
1169 | ||
8bf11d8d JB |
1170 | void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, |
1171 | const u8 *bssid, const u8 *addr, | |
1172 | u32 supp_rates) | |
46900298 | 1173 | { |
2e10d330 | 1174 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
46900298 JB |
1175 | struct ieee80211_local *local = sdata->local; |
1176 | struct sta_info *sta; | |
55de908a | 1177 | struct ieee80211_chanctx_conf *chanctx_conf; |
b422c6cd | 1178 | struct ieee80211_supported_band *sband; |
74608aca | 1179 | enum nl80211_bss_scan_width scan_width; |
55de908a | 1180 | int band; |
46900298 | 1181 | |
af8cdcd8 JB |
1182 | /* |
1183 | * XXX: Consider removing the least recently used entry and | |
1184 | * allow new one to be added. | |
1185 | */ | |
46900298 | 1186 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { |
bdcbd8e0 | 1187 | net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
e87cc472 | 1188 | sdata->name, addr); |
8bf11d8d | 1189 | return; |
46900298 JB |
1190 | } |
1191 | ||
2e10d330 | 1192 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) |
8bf11d8d | 1193 | return; |
2e10d330 | 1194 | |
b203ca39 | 1195 | if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) |
8bf11d8d | 1196 | return; |
46900298 | 1197 | |
55de908a JB |
1198 | rcu_read_lock(); |
1199 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
1200 | if (WARN_ON_ONCE(!chanctx_conf)) { | |
1201 | rcu_read_unlock(); | |
1202 | return; | |
1203 | } | |
4bf88530 | 1204 | band = chanctx_conf->def.chan->band; |
74608aca | 1205 | scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); |
55de908a JB |
1206 | rcu_read_unlock(); |
1207 | ||
8bf11d8d | 1208 | sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); |
46900298 | 1209 | if (!sta) |
8bf11d8d | 1210 | return; |
46900298 | 1211 | |
c8716d9d | 1212 | sta->last_rx = jiffies; |
d9a7ddb0 | 1213 | |
46900298 | 1214 | /* make sure mandatory rates are always added */ |
b422c6cd | 1215 | sband = local->hw.wiphy->bands[band]; |
46900298 | 1216 | sta->sta.supp_rates[band] = supp_rates | |
74608aca | 1217 | ieee80211_mandatory_rates(sband, scan_width); |
46900298 | 1218 | |
8bf11d8d JB |
1219 | spin_lock(&ifibss->incomplete_lock); |
1220 | list_add(&sta->list, &ifibss->incomplete_stations); | |
1221 | spin_unlock(&ifibss->incomplete_lock); | |
1222 | ieee80211_queue_work(&local->hw, &sdata->work); | |
46900298 JB |
1223 | } |
1224 | ||
dad9defd AQ |
1225 | static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata) |
1226 | { | |
1227 | struct ieee80211_local *local = sdata->local; | |
1228 | struct sta_info *sta, *tmp; | |
1229 | unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT; | |
1230 | unsigned long exp_rsn_time = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT; | |
1231 | ||
1232 | mutex_lock(&local->sta_mtx); | |
1233 | ||
1234 | list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { | |
1235 | if (sdata != sta->sdata) | |
1236 | continue; | |
1237 | ||
1238 | if (time_after(jiffies, sta->last_rx + exp_time) || | |
1239 | (time_after(jiffies, sta->last_rx + exp_rsn_time) && | |
1240 | sta->sta_state != IEEE80211_STA_AUTHORIZED)) { | |
1241 | sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n", | |
1242 | sta->sta_state != IEEE80211_STA_AUTHORIZED ? | |
1243 | "not authorized " : "", sta->sta.addr); | |
1244 | ||
1245 | WARN_ON(__sta_info_destroy(sta)); | |
1246 | } | |
1247 | } | |
1248 | ||
1249 | mutex_unlock(&local->sta_mtx); | |
1250 | } | |
1251 | ||
ce9058ae BP |
1252 | /* |
1253 | * This function is called with state == IEEE80211_IBSS_MLME_JOINED | |
1254 | */ | |
46900298 JB |
1255 | |
1256 | static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) | |
1257 | { | |
1258 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
7ca15a0a | 1259 | enum nl80211_bss_scan_width scan_width; |
46900298 | 1260 | |
8d61ffa5 | 1261 | sdata_assert_lock(sdata); |
7a17a33c | 1262 | |
af8cdcd8 JB |
1263 | mod_timer(&ifibss->timer, |
1264 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 | 1265 | |
dad9defd | 1266 | ieee80211_ibss_sta_expire(sdata); |
af8cdcd8 | 1267 | |
450aae3d S |
1268 | if (time_before(jiffies, ifibss->last_scan_completed + |
1269 | IEEE80211_IBSS_MERGE_INTERVAL)) | |
1270 | return; | |
1271 | ||
46900298 JB |
1272 | if (ieee80211_sta_active_ibss(sdata)) |
1273 | return; | |
1274 | ||
c037b836 | 1275 | if (ifibss->fixed_channel) |
46900298 JB |
1276 | return; |
1277 | ||
bdcbd8e0 JB |
1278 | sdata_info(sdata, |
1279 | "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); | |
46900298 | 1280 | |
7ca15a0a | 1281 | scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); |
34bcf715 | 1282 | ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len, |
7ca15a0a | 1283 | NULL, scan_width); |
46900298 JB |
1284 | } |
1285 | ||
af8cdcd8 | 1286 | static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
1287 | { |
1288 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
46900298 | 1289 | u8 bssid[ETH_ALEN]; |
46900298 JB |
1290 | u16 capability; |
1291 | int i; | |
1292 | ||
8d61ffa5 | 1293 | sdata_assert_lock(sdata); |
7a17a33c | 1294 | |
af8cdcd8 | 1295 | if (ifibss->fixed_bssid) { |
46900298 JB |
1296 | memcpy(bssid, ifibss->bssid, ETH_ALEN); |
1297 | } else { | |
1298 | /* Generate random, not broadcast, locally administered BSSID. Mix in | |
1299 | * own MAC address to make sure that devices that do not have proper | |
1300 | * random number generator get different BSSID. */ | |
1301 | get_random_bytes(bssid, ETH_ALEN); | |
1302 | for (i = 0; i < ETH_ALEN; i++) | |
47846c9b | 1303 | bssid[i] ^= sdata->vif.addr[i]; |
46900298 JB |
1304 | bssid[0] &= ~0x01; |
1305 | bssid[0] |= 0x02; | |
1306 | } | |
1307 | ||
bdcbd8e0 | 1308 | sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); |
46900298 | 1309 | |
46900298 JB |
1310 | capability = WLAN_CAPABILITY_IBSS; |
1311 | ||
fffd0934 | 1312 | if (ifibss->privacy) |
46900298 JB |
1313 | capability |= WLAN_CAPABILITY_PRIVACY; |
1314 | else | |
1315 | sdata->drop_unencrypted = 0; | |
1316 | ||
57c4d7b4 | 1317 | __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, |
75a423f4 | 1318 | &ifibss->chandef, ifibss->basic_rates, |
c13a765b | 1319 | capability, 0, true); |
46900298 JB |
1320 | } |
1321 | ||
ce9058ae BP |
1322 | /* |
1323 | * This function is called with state == IEEE80211_IBSS_MLME_SEARCH | |
1324 | */ | |
1325 | ||
af8cdcd8 | 1326 | static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
1327 | { |
1328 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1329 | struct ieee80211_local *local = sdata->local; | |
0c1ad2ca | 1330 | struct cfg80211_bss *cbss; |
af8cdcd8 | 1331 | struct ieee80211_channel *chan = NULL; |
46900298 | 1332 | const u8 *bssid = NULL; |
7ca15a0a | 1333 | enum nl80211_bss_scan_width scan_width; |
46900298 | 1334 | int active_ibss; |
e0d61887 | 1335 | u16 capability; |
46900298 | 1336 | |
8d61ffa5 | 1337 | sdata_assert_lock(sdata); |
7a17a33c | 1338 | |
46900298 | 1339 | active_ibss = ieee80211_sta_active_ibss(sdata); |
bdcbd8e0 | 1340 | ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); |
46900298 JB |
1341 | |
1342 | if (active_ibss) | |
af8cdcd8 | 1343 | return; |
46900298 | 1344 | |
e0d61887 | 1345 | capability = WLAN_CAPABILITY_IBSS; |
fffd0934 | 1346 | if (ifibss->privacy) |
e0d61887 | 1347 | capability |= WLAN_CAPABILITY_PRIVACY; |
af8cdcd8 JB |
1348 | if (ifibss->fixed_bssid) |
1349 | bssid = ifibss->bssid; | |
1350 | if (ifibss->fixed_channel) | |
3aede78a | 1351 | chan = ifibss->chandef.chan; |
af8cdcd8 | 1352 | if (!is_zero_ether_addr(ifibss->bssid)) |
46900298 | 1353 | bssid = ifibss->bssid; |
0c1ad2ca JB |
1354 | cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, |
1355 | ifibss->ssid, ifibss->ssid_len, | |
1356 | WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY, | |
1357 | capability); | |
1358 | ||
1359 | if (cbss) { | |
1360 | struct ieee80211_bss *bss; | |
46900298 | 1361 | |
0c1ad2ca | 1362 | bss = (void *)cbss->priv; |
bdcbd8e0 JB |
1363 | ibss_dbg(sdata, |
1364 | "sta_find_ibss: selected %pM current %pM\n", | |
1365 | cbss->bssid, ifibss->bssid); | |
1366 | sdata_info(sdata, | |
1367 | "Selected IBSS BSSID %pM based on configured SSID\n", | |
1368 | cbss->bssid); | |
46900298 | 1369 | |
af8cdcd8 | 1370 | ieee80211_sta_join_ibss(sdata, bss); |
46900298 | 1371 | ieee80211_rx_bss_put(local, bss); |
af8cdcd8 | 1372 | return; |
d419b9f0 | 1373 | } |
46900298 | 1374 | |
d8eb741e AQ |
1375 | /* if a fixed bssid and a fixed freq have been provided create the IBSS |
1376 | * directly and do not waste time scanning | |
1377 | */ | |
1378 | if (ifibss->fixed_bssid && ifibss->fixed_channel) { | |
1379 | sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n", | |
1380 | bssid); | |
1381 | ieee80211_sta_create_ibss(sdata); | |
1382 | return; | |
1383 | } | |
1384 | ||
1385 | ||
bdcbd8e0 | 1386 | ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); |
46900298 JB |
1387 | |
1388 | /* Selected IBSS not found in current scan results - try to scan */ | |
ce9058ae | 1389 | if (time_after(jiffies, ifibss->last_scan_completed + |
46900298 | 1390 | IEEE80211_SCAN_INTERVAL)) { |
bdcbd8e0 | 1391 | sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); |
46900298 | 1392 | |
7ca15a0a | 1393 | scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); |
34bcf715 | 1394 | ieee80211_request_ibss_scan(sdata, ifibss->ssid, |
7ca15a0a SW |
1395 | ifibss->ssid_len, chan, |
1396 | scan_width); | |
ce9058ae | 1397 | } else { |
46900298 JB |
1398 | int interval = IEEE80211_SCAN_INTERVAL; |
1399 | ||
1400 | if (time_after(jiffies, ifibss->ibss_join_req + | |
55de908a JB |
1401 | IEEE80211_IBSS_JOIN_TIMEOUT)) |
1402 | ieee80211_sta_create_ibss(sdata); | |
46900298 | 1403 | |
af8cdcd8 JB |
1404 | mod_timer(&ifibss->timer, |
1405 | round_jiffies(jiffies + interval)); | |
46900298 | 1406 | } |
46900298 JB |
1407 | } |
1408 | ||
1409 | static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, | |
c269a203 | 1410 | struct sk_buff *req) |
46900298 | 1411 | { |
c269a203 | 1412 | struct ieee80211_mgmt *mgmt = (void *)req->data; |
46900298 JB |
1413 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
1414 | struct ieee80211_local *local = sdata->local; | |
c269a203 | 1415 | int tx_last_beacon, len = req->len; |
46900298 | 1416 | struct sk_buff *skb; |
c3ffeab4 | 1417 | struct beacon_data *presp; |
46900298 JB |
1418 | u8 *pos, *end; |
1419 | ||
8d61ffa5 | 1420 | sdata_assert_lock(sdata); |
7a17a33c | 1421 | |
40b275b6 | 1422 | presp = rcu_dereference_protected(ifibss->presp, |
8d61ffa5 | 1423 | lockdep_is_held(&sdata->wdev.mtx)); |
40b275b6 | 1424 | |
46900298 | 1425 | if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || |
40b275b6 | 1426 | len < 24 + 2 || !presp) |
46900298 JB |
1427 | return; |
1428 | ||
24487981 | 1429 | tx_last_beacon = drv_tx_last_beacon(local); |
46900298 | 1430 | |
bdcbd8e0 JB |
1431 | ibss_dbg(sdata, |
1432 | "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n", | |
1433 | mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon); | |
46900298 | 1434 | |
1ed76487 | 1435 | if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) |
46900298 JB |
1436 | return; |
1437 | ||
b203ca39 | 1438 | if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && |
888d04df | 1439 | !is_broadcast_ether_addr(mgmt->bssid)) |
46900298 JB |
1440 | return; |
1441 | ||
1442 | end = ((u8 *) mgmt) + len; | |
1443 | pos = mgmt->u.probe_req.variable; | |
1444 | if (pos[0] != WLAN_EID_SSID || | |
1445 | pos + 2 + pos[1] > end) { | |
bdcbd8e0 JB |
1446 | ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", |
1447 | mgmt->sa); | |
46900298 JB |
1448 | return; |
1449 | } | |
1450 | if (pos[1] != 0 && | |
1451 | (pos[1] != ifibss->ssid_len || | |
0da780c2 | 1452 | memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { |
46900298 JB |
1453 | /* Ignore ProbeReq for foreign SSID */ |
1454 | return; | |
1455 | } | |
1456 | ||
1457 | /* Reply with ProbeResp */ | |
c3ffeab4 | 1458 | skb = dev_alloc_skb(local->tx_headroom + presp->head_len); |
46900298 JB |
1459 | if (!skb) |
1460 | return; | |
1461 | ||
c3ffeab4 JB |
1462 | skb_reserve(skb, local->tx_headroom); |
1463 | memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len); | |
1464 | ||
1465 | memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN); | |
1466 | ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa); | |
62ae67be JB |
1467 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
1468 | ieee80211_tx_skb(sdata, skb); | |
46900298 JB |
1469 | } |
1470 | ||
d45c4172 EG |
1471 | static |
1472 | void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata, | |
1473 | struct ieee80211_mgmt *mgmt, size_t len, | |
1474 | struct ieee80211_rx_status *rx_status) | |
46900298 JB |
1475 | { |
1476 | size_t baselen; | |
1477 | struct ieee802_11_elems elems; | |
1478 | ||
d45c4172 EG |
1479 | BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) != |
1480 | offsetof(typeof(mgmt->u.beacon), variable)); | |
1481 | ||
1482 | /* | |
1483 | * either beacon or probe_resp but the variable field is at the | |
1484 | * same offset | |
1485 | */ | |
46900298 JB |
1486 | baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; |
1487 | if (baselen > len) | |
1488 | return; | |
1489 | ||
1490 | ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, | |
b2e506bf | 1491 | false, &elems); |
46900298 | 1492 | |
d45c4172 | 1493 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); |
46900298 JB |
1494 | } |
1495 | ||
1fa57d01 JB |
1496 | void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, |
1497 | struct sk_buff *skb) | |
46900298 JB |
1498 | { |
1499 | struct ieee80211_rx_status *rx_status; | |
1500 | struct ieee80211_mgmt *mgmt; | |
1501 | u16 fc; | |
cd7760e6 SW |
1502 | struct ieee802_11_elems elems; |
1503 | int ies_len; | |
46900298 | 1504 | |
f1d58c25 | 1505 | rx_status = IEEE80211_SKB_RXCB(skb); |
46900298 JB |
1506 | mgmt = (struct ieee80211_mgmt *) skb->data; |
1507 | fc = le16_to_cpu(mgmt->frame_control); | |
1508 | ||
8d61ffa5 | 1509 | sdata_lock(sdata); |
7a17a33c | 1510 | |
c926d006 TH |
1511 | if (!sdata->u.ibss.ssid_len) |
1512 | goto mgmt_out; /* not ready to merge yet */ | |
1513 | ||
46900298 JB |
1514 | switch (fc & IEEE80211_FCTL_STYPE) { |
1515 | case IEEE80211_STYPE_PROBE_REQ: | |
c269a203 | 1516 | ieee80211_rx_mgmt_probe_req(sdata, skb); |
46900298 JB |
1517 | break; |
1518 | case IEEE80211_STYPE_PROBE_RESP: | |
46900298 | 1519 | case IEEE80211_STYPE_BEACON: |
d45c4172 EG |
1520 | ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len, |
1521 | rx_status); | |
46900298 JB |
1522 | break; |
1523 | case IEEE80211_STYPE_AUTH: | |
1524 | ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); | |
1525 | break; | |
2cc59e78 AQ |
1526 | case IEEE80211_STYPE_DEAUTH: |
1527 | ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); | |
1528 | break; | |
cd7760e6 SW |
1529 | case IEEE80211_STYPE_ACTION: |
1530 | switch (mgmt->u.action.category) { | |
1531 | case WLAN_CATEGORY_SPECTRUM_MGMT: | |
1532 | ies_len = skb->len - | |
1533 | offsetof(struct ieee80211_mgmt, | |
1534 | u.action.u.chan_switch.variable); | |
1535 | ||
1536 | if (ies_len < 0) | |
1537 | break; | |
1538 | ||
1539 | ieee802_11_parse_elems( | |
1540 | mgmt->u.action.u.chan_switch.variable, | |
1541 | ies_len, true, &elems); | |
1542 | ||
1543 | if (elems.parse_error) | |
1544 | break; | |
1545 | ||
1546 | ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len, | |
1547 | rx_status, &elems); | |
1548 | break; | |
1549 | } | |
46900298 | 1550 | } |
7a17a33c | 1551 | |
c926d006 | 1552 | mgmt_out: |
8d61ffa5 | 1553 | sdata_unlock(sdata); |
46900298 JB |
1554 | } |
1555 | ||
1fa57d01 | 1556 | void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) |
46900298 | 1557 | { |
1fa57d01 | 1558 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
8bf11d8d | 1559 | struct sta_info *sta; |
46900298 | 1560 | |
8d61ffa5 | 1561 | sdata_lock(sdata); |
7a17a33c JB |
1562 | |
1563 | /* | |
1564 | * Work could be scheduled after scan or similar | |
1565 | * when we aren't even joined (or trying) with a | |
1566 | * network. | |
1567 | */ | |
1568 | if (!ifibss->ssid_len) | |
1569 | goto out; | |
46900298 | 1570 | |
8bf11d8d JB |
1571 | spin_lock_bh(&ifibss->incomplete_lock); |
1572 | while (!list_empty(&ifibss->incomplete_stations)) { | |
1573 | sta = list_first_entry(&ifibss->incomplete_stations, | |
1574 | struct sta_info, list); | |
1575 | list_del(&sta->list); | |
1576 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1577 | ||
52874a5e | 1578 | ieee80211_ibss_finish_sta(sta); |
8bf11d8d JB |
1579 | rcu_read_unlock(); |
1580 | spin_lock_bh(&ifibss->incomplete_lock); | |
1581 | } | |
1582 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1583 | ||
46900298 JB |
1584 | switch (ifibss->state) { |
1585 | case IEEE80211_IBSS_MLME_SEARCH: | |
1586 | ieee80211_sta_find_ibss(sdata); | |
1587 | break; | |
1588 | case IEEE80211_IBSS_MLME_JOINED: | |
1589 | ieee80211_sta_merge_ibss(sdata); | |
1590 | break; | |
1591 | default: | |
1592 | WARN_ON(1); | |
1593 | break; | |
1594 | } | |
46900298 | 1595 | |
7a17a33c | 1596 | out: |
8d61ffa5 | 1597 | sdata_unlock(sdata); |
3a4d4aa2 JB |
1598 | } |
1599 | ||
46900298 JB |
1600 | static void ieee80211_ibss_timer(unsigned long data) |
1601 | { | |
1602 | struct ieee80211_sub_if_data *sdata = | |
1603 | (struct ieee80211_sub_if_data *) data; | |
5bb644a0 | 1604 | |
a6182943 | 1605 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
5bb644a0 | 1606 | } |
5bb644a0 | 1607 | |
46900298 JB |
1608 | void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) |
1609 | { | |
1610 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1611 | ||
46900298 JB |
1612 | setup_timer(&ifibss->timer, ieee80211_ibss_timer, |
1613 | (unsigned long) sdata); | |
8bf11d8d JB |
1614 | INIT_LIST_HEAD(&ifibss->incomplete_stations); |
1615 | spin_lock_init(&ifibss->incomplete_lock); | |
cd7760e6 SW |
1616 | INIT_WORK(&ifibss->csa_connection_drop_work, |
1617 | ieee80211_csa_connection_drop_work); | |
46900298 JB |
1618 | } |
1619 | ||
1620 | /* scan finished notification */ | |
1621 | void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) | |
1622 | { | |
af8cdcd8 | 1623 | struct ieee80211_sub_if_data *sdata; |
46900298 | 1624 | |
29b4a4f7 JB |
1625 | mutex_lock(&local->iflist_mtx); |
1626 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 1627 | if (!ieee80211_sdata_running(sdata)) |
0e41f715 | 1628 | continue; |
af8cdcd8 JB |
1629 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
1630 | continue; | |
1631 | sdata->u.ibss.last_scan_completed = jiffies; | |
7a17a33c | 1632 | ieee80211_queue_work(&local->hw, &sdata->work); |
46900298 | 1633 | } |
29b4a4f7 | 1634 | mutex_unlock(&local->iflist_mtx); |
46900298 JB |
1635 | } |
1636 | ||
af8cdcd8 JB |
1637 | int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, |
1638 | struct cfg80211_ibss_params *params) | |
1639 | { | |
ff3cc5f4 | 1640 | u32 changed = 0; |
2103dec1 SW |
1641 | u32 rate_flags; |
1642 | struct ieee80211_supported_band *sband; | |
1643 | int i; | |
af8cdcd8 | 1644 | |
af8cdcd8 JB |
1645 | if (params->bssid) { |
1646 | memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); | |
1647 | sdata->u.ibss.fixed_bssid = true; | |
1648 | } else | |
1649 | sdata->u.ibss.fixed_bssid = false; | |
1650 | ||
fffd0934 | 1651 | sdata->u.ibss.privacy = params->privacy; |
267335d6 | 1652 | sdata->u.ibss.control_port = params->control_port; |
8e8d347d | 1653 | sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs; |
fbd2c8dc | 1654 | sdata->u.ibss.basic_rates = params->basic_rates; |
2103dec1 SW |
1655 | |
1656 | /* fix basic_rates if channel does not support these rates */ | |
1657 | rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef); | |
1658 | sband = sdata->local->hw.wiphy->bands[params->chandef.chan->band]; | |
1659 | for (i = 0; i < sband->n_bitrates; i++) { | |
1660 | if ((rate_flags & sband->bitrates[i].flags) != rate_flags) | |
1661 | sdata->u.ibss.basic_rates &= ~BIT(i); | |
1662 | } | |
dd5b4cc7 FF |
1663 | memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, |
1664 | sizeof(params->mcast_rate)); | |
fffd0934 | 1665 | |
57c4d7b4 JB |
1666 | sdata->vif.bss_conf.beacon_int = params->beacon_interval; |
1667 | ||
3aede78a | 1668 | sdata->u.ibss.chandef = params->chandef; |
af8cdcd8 JB |
1669 | sdata->u.ibss.fixed_channel = params->channel_fixed; |
1670 | ||
1671 | if (params->ie) { | |
1672 | sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, | |
1673 | GFP_KERNEL); | |
1674 | if (sdata->u.ibss.ie) | |
1675 | sdata->u.ibss.ie_len = params->ie_len; | |
1676 | } | |
1677 | ||
af8cdcd8 JB |
1678 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; |
1679 | sdata->u.ibss.ibss_join_req = jiffies; | |
1680 | ||
badecb00 | 1681 | memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); |
0e41f715 JB |
1682 | sdata->u.ibss.ssid_len = params->ssid_len; |
1683 | ||
822854b0 SW |
1684 | memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa, |
1685 | sizeof(sdata->u.ibss.ht_capa)); | |
1686 | memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask, | |
1687 | sizeof(sdata->u.ibss.ht_capa_mask)); | |
1688 | ||
ff3cc5f4 SW |
1689 | /* |
1690 | * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is | |
1691 | * reserved, but an HT STA shall protect HT transmissions as though | |
1692 | * the HT Protection field were set to non-HT mixed mode. | |
1693 | * | |
1694 | * In an IBSS, the RIFS Mode field of the HT Operation element is | |
1695 | * also reserved, but an HT STA shall operate as though this field | |
1696 | * were set to 1. | |
1697 | */ | |
1698 | ||
1699 | sdata->vif.bss_conf.ht_operation_mode |= | |
1700 | IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | |
1701 | | IEEE80211_HT_PARAM_RIFS_MODE; | |
1702 | ||
1703 | changed |= BSS_CHANGED_HT; | |
1704 | ieee80211_bss_info_change_notify(sdata, changed); | |
1705 | ||
04ecd257 JB |
1706 | sdata->smps_mode = IEEE80211_SMPS_OFF; |
1707 | sdata->needed_rx_chains = sdata->local->rx_chains; | |
1708 | ||
64592c8f | 1709 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
af8cdcd8 JB |
1710 | |
1711 | return 0; | |
1712 | } | |
1713 | ||
1714 | int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) | |
1715 | { | |
5ea096c0 | 1716 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
5ea096c0 | 1717 | |
871a4180 | 1718 | ieee80211_ibss_disconnect(sdata); |
b78a4932 | 1719 | ifibss->ssid_len = 0; |
871a4180 | 1720 | memset(ifibss->bssid, 0, ETH_ALEN); |
af8cdcd8 JB |
1721 | |
1722 | /* remove beacon */ | |
1723 | kfree(sdata->u.ibss.ie); | |
822854b0 SW |
1724 | |
1725 | /* on the next join, re-program HT parameters */ | |
1726 | memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa)); | |
1727 | memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask)); | |
1728 | ||
af8cdcd8 | 1729 | synchronize_rcu(); |
af8cdcd8 | 1730 | |
35f20c14 | 1731 | skb_queue_purge(&sdata->skb_queue); |
5cff20e6 | 1732 | |
bc05d19f | 1733 | del_timer_sync(&sdata->u.ibss.timer); |
7a17a33c | 1734 | |
af8cdcd8 JB |
1735 | return 0; |
1736 | } |