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46900298 JB |
1 | /* |
2 | * IBSS mode implementation | |
3 | * Copyright 2003-2008, Jouni Malinen <j@w1.fi> | |
4 | * Copyright 2004, Instant802 Networks, Inc. | |
5 | * Copyright 2005, Devicescape Software, Inc. | |
6 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
7 | * Copyright 2007, Michael Wu <flamingice@sourmilk.net> | |
8 | * Copyright 2009, Johannes Berg <johannes@sipsolutions.net> | |
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 | ieee80211_vif_release_channel(sdata); |
298 | if (ieee80211_vif_use_channel(sdata, &chandef, | |
299 | ifibss->fixed_channel ? | |
300 | IEEE80211_CHANCTX_SHARED : | |
301 | IEEE80211_CHANCTX_EXCLUSIVE)) { | |
302 | sdata_info(sdata, "Failed to join IBSS, no channel context\n"); | |
34a3740d | 303 | mutex_unlock(&local->mtx); |
d51b70ff SW |
304 | return; |
305 | } | |
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 | |
8e8d347d | 321 | sdata->radar_required = radar_required; |
d6a83228 | 322 | sdata->vif.bss_conf.enable_beacon = true; |
2d0ddec5 | 323 | sdata->vif.bss_conf.beacon_int = beacon_int; |
fbd2c8dc | 324 | sdata->vif.bss_conf.basic_rates = basic_rates; |
0ca54f6c MP |
325 | sdata->vif.bss_conf.ssid_len = ifibss->ssid_len; |
326 | memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len); | |
2d0ddec5 JB |
327 | bss_change = BSS_CHANGED_BEACON_INT; |
328 | bss_change |= ieee80211_reset_erp_info(sdata); | |
329 | bss_change |= BSS_CHANGED_BSSID; | |
330 | bss_change |= BSS_CHANGED_BEACON; | |
331 | bss_change |= BSS_CHANGED_BEACON_ENABLED; | |
392cfdb1 | 332 | bss_change |= BSS_CHANGED_BASIC_RATES; |
13c40c54 | 333 | bss_change |= BSS_CHANGED_HT; |
8fc214ba | 334 | bss_change |= BSS_CHANGED_IBSS; |
0ca54f6c | 335 | bss_change |= BSS_CHANGED_SSID; |
2f91a967 SW |
336 | |
337 | /* | |
338 | * In 5 GHz/802.11a, we can always use short slot time. | |
339 | * (IEEE 802.11-2012 18.3.8.7) | |
340 | * | |
341 | * In 2.4GHz, we must always use long slots in IBSS for compatibility | |
342 | * reasons. | |
343 | * (IEEE 802.11-2012 19.4.5) | |
344 | * | |
345 | * HT follows these specifications (IEEE 802.11-2012 20.3.18) | |
346 | */ | |
347 | sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ; | |
348 | bss_change |= BSS_CHANGED_ERP_SLOT; | |
349 | ||
2ec9c1f6 SW |
350 | /* cf. IEEE 802.11 9.2.12 */ |
351 | if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit) | |
352 | sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; | |
353 | else | |
354 | sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; | |
355 | ||
55fff501 JB |
356 | ieee80211_set_wmm_default(sdata, true); |
357 | ||
8fc214ba | 358 | sdata->vif.bss_conf.ibss_joined = true; |
c13a765b | 359 | sdata->vif.bss_conf.ibss_creator = creator; |
46900298 | 360 | |
55fff501 JB |
361 | err = drv_join_ibss(local, sdata); |
362 | if (err) { | |
363 | sdata->vif.bss_conf.ibss_joined = false; | |
364 | sdata->vif.bss_conf.ibss_creator = false; | |
365 | sdata->vif.bss_conf.enable_beacon = false; | |
366 | sdata->vif.bss_conf.ssid_len = 0; | |
367 | RCU_INIT_POINTER(ifibss->presp, NULL); | |
368 | kfree_rcu(presp, rcu_head); | |
34a3740d | 369 | mutex_lock(&local->mtx); |
55fff501 | 370 | ieee80211_vif_release_channel(sdata); |
34a3740d | 371 | mutex_unlock(&local->mtx); |
55fff501 JB |
372 | sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n", |
373 | err); | |
374 | return; | |
375 | } | |
376 | ||
377 | ieee80211_bss_info_change_notify(sdata, bss_change); | |
46900298 | 378 | |
46900298 | 379 | ifibss->state = IEEE80211_IBSS_MLME_JOINED; |
af8cdcd8 JB |
380 | mod_timer(&ifibss->timer, |
381 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 | 382 | |
7ca15a0a SW |
383 | scan_width = cfg80211_chandef_to_scan_width(&chandef); |
384 | bss = cfg80211_inform_bss_width_frame(local->hw.wiphy, chan, | |
385 | scan_width, mgmt, | |
386 | presp->head_len, 0, GFP_KERNEL); | |
5b112d3d | 387 | cfg80211_put_bss(local->hw.wiphy, bss); |
86a2ea41 | 388 | netif_carrier_on(sdata->dev); |
af8cdcd8 | 389 | cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL); |
46900298 JB |
390 | } |
391 | ||
af8cdcd8 JB |
392 | static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
393 | struct ieee80211_bss *bss) | |
46900298 | 394 | { |
0c1ad2ca JB |
395 | struct cfg80211_bss *cbss = |
396 | container_of((void *)bss, struct cfg80211_bss, priv); | |
b59066a2 | 397 | struct ieee80211_supported_band *sband; |
75a423f4 | 398 | struct cfg80211_chan_def chandef; |
b59066a2 JB |
399 | u32 basic_rates; |
400 | int i, j; | |
0c1ad2ca | 401 | u16 beacon_int = cbss->beacon_interval; |
8cef2c9d | 402 | const struct cfg80211_bss_ies *ies; |
75a423f4 | 403 | enum nl80211_channel_type chan_type; |
8cef2c9d | 404 | u64 tsf; |
2103dec1 SW |
405 | u32 rate_flags; |
406 | int shift; | |
57c4d7b4 | 407 | |
8d61ffa5 | 408 | sdata_assert_lock(sdata); |
7a17a33c | 409 | |
57c4d7b4 JB |
410 | if (beacon_int < 10) |
411 | beacon_int = 10; | |
412 | ||
75a423f4 SW |
413 | switch (sdata->u.ibss.chandef.width) { |
414 | case NL80211_CHAN_WIDTH_20_NOHT: | |
415 | case NL80211_CHAN_WIDTH_20: | |
416 | case NL80211_CHAN_WIDTH_40: | |
417 | chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef); | |
418 | cfg80211_chandef_create(&chandef, cbss->channel, chan_type); | |
419 | break; | |
420 | case NL80211_CHAN_WIDTH_5: | |
421 | case NL80211_CHAN_WIDTH_10: | |
422 | cfg80211_chandef_create(&chandef, cbss->channel, | |
423 | NL80211_CHAN_WIDTH_20_NOHT); | |
424 | chandef.width = sdata->u.ibss.chandef.width; | |
425 | break; | |
426 | default: | |
427 | /* fall back to 20 MHz for unsupported modes */ | |
428 | cfg80211_chandef_create(&chandef, cbss->channel, | |
429 | NL80211_CHAN_WIDTH_20_NOHT); | |
430 | break; | |
431 | } | |
432 | ||
0c1ad2ca | 433 | sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; |
2103dec1 SW |
434 | rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef); |
435 | shift = ieee80211_vif_get_shift(&sdata->vif); | |
b59066a2 JB |
436 | |
437 | basic_rates = 0; | |
438 | ||
439 | for (i = 0; i < bss->supp_rates_len; i++) { | |
2103dec1 | 440 | int rate = bss->supp_rates[i] & 0x7f; |
b59066a2 JB |
441 | bool is_basic = !!(bss->supp_rates[i] & 0x80); |
442 | ||
443 | for (j = 0; j < sband->n_bitrates; j++) { | |
2103dec1 SW |
444 | int brate; |
445 | if ((rate_flags & sband->bitrates[j].flags) | |
446 | != rate_flags) | |
447 | continue; | |
448 | ||
449 | brate = DIV_ROUND_UP(sband->bitrates[j].bitrate, | |
450 | 5 * (1 << shift)); | |
451 | if (brate == rate) { | |
b59066a2 JB |
452 | if (is_basic) |
453 | basic_rates |= BIT(j); | |
454 | break; | |
455 | } | |
456 | } | |
457 | } | |
458 | ||
8cef2c9d JB |
459 | rcu_read_lock(); |
460 | ies = rcu_dereference(cbss->ies); | |
461 | tsf = ies->tsf; | |
462 | rcu_read_unlock(); | |
463 | ||
0c1ad2ca | 464 | __ieee80211_sta_join_ibss(sdata, cbss->bssid, |
57c4d7b4 | 465 | beacon_int, |
75a423f4 | 466 | &chandef, |
b59066a2 | 467 | basic_rates, |
0c1ad2ca | 468 | cbss->capability, |
8cef2c9d | 469 | tsf, false); |
46900298 JB |
470 | } |
471 | ||
cd7760e6 SW |
472 | int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata, |
473 | struct cfg80211_csa_settings *csa_settings) | |
474 | { | |
475 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
476 | struct beacon_data *presp, *old_presp; | |
477 | struct cfg80211_bss *cbss; | |
478 | const struct cfg80211_bss_ies *ies; | |
479 | u16 capability; | |
480 | u64 tsf; | |
481 | int ret = 0; | |
482 | ||
483 | sdata_assert_lock(sdata); | |
484 | ||
485 | capability = WLAN_CAPABILITY_IBSS; | |
486 | ||
487 | if (ifibss->privacy) | |
488 | capability |= WLAN_CAPABILITY_PRIVACY; | |
489 | ||
490 | cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan, | |
491 | ifibss->bssid, ifibss->ssid, | |
492 | ifibss->ssid_len, WLAN_CAPABILITY_IBSS | | |
493 | WLAN_CAPABILITY_PRIVACY, | |
494 | capability); | |
495 | ||
496 | if (WARN_ON(!cbss)) { | |
497 | ret = -EINVAL; | |
498 | goto out; | |
499 | } | |
500 | ||
501 | rcu_read_lock(); | |
502 | ies = rcu_dereference(cbss->ies); | |
503 | tsf = ies->tsf; | |
504 | rcu_read_unlock(); | |
505 | cfg80211_put_bss(sdata->local->hw.wiphy, cbss); | |
506 | ||
507 | old_presp = rcu_dereference_protected(ifibss->presp, | |
508 | lockdep_is_held(&sdata->wdev.mtx)); | |
509 | ||
510 | presp = ieee80211_ibss_build_presp(sdata, | |
511 | sdata->vif.bss_conf.beacon_int, | |
512 | sdata->vif.bss_conf.basic_rates, | |
513 | capability, tsf, &ifibss->chandef, | |
514 | NULL, csa_settings); | |
515 | if (!presp) { | |
516 | ret = -ENOMEM; | |
517 | goto out; | |
518 | } | |
519 | ||
520 | rcu_assign_pointer(ifibss->presp, presp); | |
521 | if (old_presp) | |
522 | kfree_rcu(old_presp, rcu_head); | |
523 | ||
9449410f SW |
524 | /* it might not send the beacon for a while. send an action frame |
525 | * immediately to announce the channel switch. | |
526 | */ | |
527 | if (csa_settings) | |
528 | ieee80211_send_action_csa(sdata, csa_settings); | |
529 | ||
dddd586b | 530 | return BSS_CHANGED_BEACON; |
cd7760e6 SW |
531 | out: |
532 | return ret; | |
533 | } | |
534 | ||
535 | int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata) | |
536 | { | |
537 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
538 | struct cfg80211_bss *cbss; | |
539 | int err; | |
540 | u16 capability; | |
541 | ||
bafdc614 SW |
542 | sdata_assert_lock(sdata); |
543 | ||
cd7760e6 SW |
544 | /* update cfg80211 bss information with the new channel */ |
545 | if (!is_zero_ether_addr(ifibss->bssid)) { | |
546 | capability = WLAN_CAPABILITY_IBSS; | |
547 | ||
548 | if (ifibss->privacy) | |
549 | capability |= WLAN_CAPABILITY_PRIVACY; | |
550 | ||
551 | cbss = cfg80211_get_bss(sdata->local->hw.wiphy, | |
552 | ifibss->chandef.chan, | |
553 | ifibss->bssid, ifibss->ssid, | |
554 | ifibss->ssid_len, WLAN_CAPABILITY_IBSS | | |
555 | WLAN_CAPABILITY_PRIVACY, | |
556 | capability); | |
557 | /* XXX: should not really modify cfg80211 data */ | |
558 | if (cbss) { | |
33787fc4 | 559 | cbss->channel = sdata->csa_chandef.chan; |
cd7760e6 SW |
560 | cfg80211_put_bss(sdata->local->hw.wiphy, cbss); |
561 | } | |
562 | } | |
563 | ||
33787fc4 | 564 | ifibss->chandef = sdata->csa_chandef; |
cd7760e6 SW |
565 | |
566 | /* generate the beacon */ | |
567 | err = ieee80211_ibss_csa_beacon(sdata, NULL); | |
cd7760e6 SW |
568 | if (err < 0) |
569 | return err; | |
570 | ||
dddd586b LC |
571 | if (err) |
572 | ieee80211_bss_info_change_notify(sdata, err); | |
573 | ||
cd7760e6 SW |
574 | return 0; |
575 | } | |
576 | ||
577 | void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata) | |
578 | { | |
579 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
580 | ||
581 | cancel_work_sync(&ifibss->csa_connection_drop_work); | |
582 | } | |
583 | ||
52874a5e | 584 | static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta) |
8bf11d8d JB |
585 | __acquires(RCU) |
586 | { | |
587 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
588 | u8 addr[ETH_ALEN]; | |
589 | ||
590 | memcpy(addr, sta->sta.addr, ETH_ALEN); | |
591 | ||
bdcbd8e0 | 592 | ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr); |
8bf11d8d | 593 | |
83d5cc01 JB |
594 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); |
595 | sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); | |
267335d6 AQ |
596 | /* authorize the station only if the network is not RSN protected. If |
597 | * not wait for the userspace to authorize it */ | |
598 | if (!sta->sdata->u.ibss.control_port) | |
599 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); | |
8bf11d8d JB |
600 | |
601 | rate_control_rate_init(sta); | |
602 | ||
603 | /* If it fails, maybe we raced another insertion? */ | |
604 | if (sta_info_insert_rcu(sta)) | |
605 | return sta_info_get(sdata, addr); | |
606 | return sta; | |
607 | } | |
608 | ||
609 | static struct sta_info * | |
52874a5e AQ |
610 | ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid, |
611 | const u8 *addr, u32 supp_rates) | |
8bf11d8d JB |
612 | __acquires(RCU) |
613 | { | |
614 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
615 | struct ieee80211_local *local = sdata->local; | |
616 | struct sta_info *sta; | |
55de908a | 617 | struct ieee80211_chanctx_conf *chanctx_conf; |
b422c6cd | 618 | struct ieee80211_supported_band *sband; |
74608aca | 619 | enum nl80211_bss_scan_width scan_width; |
55de908a | 620 | int band; |
8bf11d8d JB |
621 | |
622 | /* | |
623 | * XXX: Consider removing the least recently used entry and | |
624 | * allow new one to be added. | |
625 | */ | |
626 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { | |
bdcbd8e0 | 627 | net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
e87cc472 | 628 | sdata->name, addr); |
8bf11d8d JB |
629 | rcu_read_lock(); |
630 | return NULL; | |
631 | } | |
632 | ||
633 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { | |
634 | rcu_read_lock(); | |
635 | return NULL; | |
636 | } | |
637 | ||
b203ca39 | 638 | if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) { |
8bf11d8d JB |
639 | rcu_read_lock(); |
640 | return NULL; | |
641 | } | |
642 | ||
55de908a JB |
643 | rcu_read_lock(); |
644 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
645 | if (WARN_ON_ONCE(!chanctx_conf)) | |
646 | return NULL; | |
4bf88530 | 647 | band = chanctx_conf->def.chan->band; |
74608aca | 648 | scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); |
55de908a JB |
649 | rcu_read_unlock(); |
650 | ||
8bf11d8d JB |
651 | sta = sta_info_alloc(sdata, addr, GFP_KERNEL); |
652 | if (!sta) { | |
653 | rcu_read_lock(); | |
654 | return NULL; | |
655 | } | |
656 | ||
657 | sta->last_rx = jiffies; | |
658 | ||
659 | /* make sure mandatory rates are always added */ | |
b422c6cd | 660 | sband = local->hw.wiphy->bands[band]; |
8bf11d8d | 661 | sta->sta.supp_rates[band] = supp_rates | |
74608aca | 662 | ieee80211_mandatory_rates(sband, scan_width); |
8bf11d8d | 663 | |
52874a5e | 664 | return ieee80211_ibss_finish_sta(sta); |
6d810f10 AQ |
665 | } |
666 | ||
871a4180 SW |
667 | static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) |
668 | { | |
669 | struct ieee80211_local *local = sdata->local; | |
670 | int active = 0; | |
671 | struct sta_info *sta; | |
672 | ||
673 | sdata_assert_lock(sdata); | |
674 | ||
675 | rcu_read_lock(); | |
676 | ||
677 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
678 | if (sta->sdata == sdata && | |
679 | time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL, | |
680 | jiffies)) { | |
681 | active++; | |
682 | break; | |
683 | } | |
684 | } | |
685 | ||
686 | rcu_read_unlock(); | |
687 | ||
688 | return active; | |
689 | } | |
690 | ||
691 | static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata) | |
692 | { | |
693 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
694 | struct ieee80211_local *local = sdata->local; | |
695 | struct cfg80211_bss *cbss; | |
696 | struct beacon_data *presp; | |
697 | struct sta_info *sta; | |
871a4180 SW |
698 | u16 capability; |
699 | ||
d4c80d9d | 700 | if (!is_zero_ether_addr(ifibss->bssid)) { |
871a4180 SW |
701 | capability = WLAN_CAPABILITY_IBSS; |
702 | ||
703 | if (ifibss->privacy) | |
704 | capability |= WLAN_CAPABILITY_PRIVACY; | |
705 | ||
706 | cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan, | |
707 | ifibss->bssid, ifibss->ssid, | |
708 | ifibss->ssid_len, WLAN_CAPABILITY_IBSS | | |
709 | WLAN_CAPABILITY_PRIVACY, | |
710 | capability); | |
711 | ||
712 | if (cbss) { | |
713 | cfg80211_unlink_bss(local->hw.wiphy, cbss); | |
714 | cfg80211_put_bss(sdata->local->hw.wiphy, cbss); | |
715 | } | |
716 | } | |
717 | ||
718 | ifibss->state = IEEE80211_IBSS_MLME_SEARCH; | |
719 | ||
720 | sta_info_flush(sdata); | |
721 | ||
722 | spin_lock_bh(&ifibss->incomplete_lock); | |
723 | while (!list_empty(&ifibss->incomplete_stations)) { | |
724 | sta = list_first_entry(&ifibss->incomplete_stations, | |
725 | struct sta_info, list); | |
726 | list_del(&sta->list); | |
727 | spin_unlock_bh(&ifibss->incomplete_lock); | |
728 | ||
729 | sta_info_free(local, sta); | |
730 | spin_lock_bh(&ifibss->incomplete_lock); | |
731 | } | |
732 | spin_unlock_bh(&ifibss->incomplete_lock); | |
733 | ||
734 | netif_carrier_off(sdata->dev); | |
735 | ||
736 | sdata->vif.bss_conf.ibss_joined = false; | |
737 | sdata->vif.bss_conf.ibss_creator = false; | |
738 | sdata->vif.bss_conf.enable_beacon = false; | |
739 | sdata->vif.bss_conf.ssid_len = 0; | |
740 | ||
741 | /* remove beacon */ | |
742 | presp = rcu_dereference_protected(ifibss->presp, | |
743 | lockdep_is_held(&sdata->wdev.mtx)); | |
744 | RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); | |
745 | if (presp) | |
746 | kfree_rcu(presp, rcu_head); | |
747 | ||
748 | clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); | |
749 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | | |
750 | BSS_CHANGED_IBSS); | |
55fff501 | 751 | drv_leave_ibss(local, sdata); |
34a3740d | 752 | mutex_lock(&local->mtx); |
871a4180 | 753 | ieee80211_vif_release_channel(sdata); |
34a3740d | 754 | mutex_unlock(&local->mtx); |
871a4180 SW |
755 | } |
756 | ||
cd7760e6 SW |
757 | static void ieee80211_csa_connection_drop_work(struct work_struct *work) |
758 | { | |
759 | struct ieee80211_sub_if_data *sdata = | |
760 | container_of(work, struct ieee80211_sub_if_data, | |
761 | u.ibss.csa_connection_drop_work); | |
762 | ||
6f07d216 LC |
763 | sdata_lock(sdata); |
764 | ||
cd7760e6 SW |
765 | ieee80211_ibss_disconnect(sdata); |
766 | synchronize_rcu(); | |
767 | skb_queue_purge(&sdata->skb_queue); | |
768 | ||
769 | /* trigger a scan to find another IBSS network to join */ | |
770 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); | |
6f07d216 LC |
771 | |
772 | sdata_unlock(sdata); | |
cd7760e6 SW |
773 | } |
774 | ||
8e8d347d SW |
775 | static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata) |
776 | { | |
777 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
778 | int err; | |
779 | ||
780 | /* if the current channel is a DFS channel, mark the channel as | |
781 | * unavailable. | |
782 | */ | |
783 | err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, | |
784 | &ifibss->chandef); | |
785 | if (err > 0) | |
786 | cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef, | |
787 | GFP_ATOMIC); | |
788 | } | |
789 | ||
cd7760e6 SW |
790 | static bool |
791 | ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata, | |
792 | struct ieee802_11_elems *elems, | |
793 | bool beacon) | |
794 | { | |
795 | struct cfg80211_csa_settings params; | |
c0f17eb9 | 796 | struct ieee80211_csa_ie csa_ie; |
cd7760e6 | 797 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
cd7760e6 | 798 | enum nl80211_channel_type ch_type; |
82a8e17d | 799 | int err; |
cd7760e6 | 800 | u32 sta_flags; |
cd7760e6 | 801 | |
cd7760e6 SW |
802 | sta_flags = IEEE80211_STA_DISABLE_VHT; |
803 | switch (ifibss->chandef.width) { | |
804 | case NL80211_CHAN_WIDTH_5: | |
805 | case NL80211_CHAN_WIDTH_10: | |
806 | case NL80211_CHAN_WIDTH_20_NOHT: | |
807 | sta_flags |= IEEE80211_STA_DISABLE_HT; | |
808 | /* fall through */ | |
809 | case NL80211_CHAN_WIDTH_20: | |
810 | sta_flags |= IEEE80211_STA_DISABLE_40MHZ; | |
811 | break; | |
812 | default: | |
813 | break; | |
814 | } | |
815 | ||
816 | memset(¶ms, 0, sizeof(params)); | |
c0f17eb9 | 817 | memset(&csa_ie, 0, sizeof(csa_ie)); |
cd7760e6 SW |
818 | err = ieee80211_parse_ch_switch_ie(sdata, elems, beacon, |
819 | ifibss->chandef.chan->band, | |
c0f17eb9 | 820 | sta_flags, ifibss->bssid, &csa_ie); |
cd7760e6 SW |
821 | /* can't switch to destination channel, fail */ |
822 | if (err < 0) | |
823 | goto disconnect; | |
824 | ||
825 | /* did not contain a CSA */ | |
826 | if (err) | |
827 | return false; | |
828 | ||
0834ae3c SW |
829 | /* channel switch is not supported, disconnect */ |
830 | if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH)) | |
831 | goto disconnect; | |
832 | ||
c0f17eb9 CYY |
833 | params.count = csa_ie.count; |
834 | params.chandef = csa_ie.chandef; | |
835 | ||
cd7760e6 SW |
836 | switch (ifibss->chandef.width) { |
837 | case NL80211_CHAN_WIDTH_20_NOHT: | |
838 | case NL80211_CHAN_WIDTH_20: | |
839 | case NL80211_CHAN_WIDTH_40: | |
840 | /* keep our current HT mode (HT20/HT40+/HT40-), even if | |
841 | * another mode has been announced. The mode is not adopted | |
842 | * within the beacon while doing CSA and we should therefore | |
843 | * keep the mode which we announce. | |
844 | */ | |
845 | ch_type = cfg80211_get_chandef_type(&ifibss->chandef); | |
846 | cfg80211_chandef_create(¶ms.chandef, params.chandef.chan, | |
847 | ch_type); | |
848 | break; | |
849 | case NL80211_CHAN_WIDTH_5: | |
850 | case NL80211_CHAN_WIDTH_10: | |
851 | if (params.chandef.width != ifibss->chandef.width) { | |
852 | sdata_info(sdata, | |
853 | "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", | |
854 | ifibss->bssid, | |
855 | params.chandef.chan->center_freq, | |
856 | params.chandef.width, | |
857 | params.chandef.center_freq1, | |
858 | params.chandef.center_freq2); | |
859 | goto disconnect; | |
860 | } | |
861 | break; | |
862 | default: | |
863 | /* should not happen, sta_flags should prevent VHT modes. */ | |
864 | WARN_ON(1); | |
865 | goto disconnect; | |
866 | } | |
867 | ||
8e8d347d | 868 | if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef)) { |
cd7760e6 SW |
869 | sdata_info(sdata, |
870 | "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", | |
871 | ifibss->bssid, | |
872 | params.chandef.chan->center_freq, | |
873 | params.chandef.width, | |
874 | params.chandef.center_freq1, | |
875 | params.chandef.center_freq2); | |
876 | goto disconnect; | |
877 | } | |
878 | ||
879 | err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, | |
880 | ¶ms.chandef); | |
881 | if (err < 0) | |
882 | goto disconnect; | |
883 | if (err) { | |
8e8d347d SW |
884 | /* IBSS-DFS only allowed with a control program */ |
885 | if (!ifibss->userspace_handles_dfs) | |
886 | goto disconnect; | |
cd7760e6 | 887 | |
8e8d347d | 888 | params.radar_required = true; |
cd7760e6 SW |
889 | } |
890 | ||
82a8e17d LC |
891 | if (cfg80211_chandef_identical(¶ms.chandef, |
892 | &sdata->vif.bss_conf.chandef)) { | |
893 | ibss_dbg(sdata, | |
894 | "received csa with an identical chandef, ignoring\n"); | |
895 | return true; | |
cd7760e6 | 896 | } |
cd7760e6 SW |
897 | |
898 | /* all checks done, now perform the channel switch. */ | |
899 | ibss_dbg(sdata, | |
900 | "received channel switch announcement to go to channel %d MHz\n", | |
901 | params.chandef.chan->center_freq); | |
902 | ||
c0f17eb9 | 903 | params.block_tx = !!csa_ie.mode; |
cd7760e6 | 904 | |
82a8e17d LC |
905 | if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev, |
906 | ¶ms)) | |
907 | goto disconnect; | |
cd7760e6 | 908 | |
8e8d347d SW |
909 | ieee80211_ibss_csa_mark_radar(sdata); |
910 | ||
cd7760e6 SW |
911 | return true; |
912 | disconnect: | |
913 | ibss_dbg(sdata, "Can't handle channel switch, disconnect\n"); | |
914 | ieee80211_queue_work(&sdata->local->hw, | |
915 | &ifibss->csa_connection_drop_work); | |
916 | ||
8e8d347d SW |
917 | ieee80211_ibss_csa_mark_radar(sdata); |
918 | ||
cd7760e6 SW |
919 | return true; |
920 | } | |
921 | ||
922 | static void | |
923 | ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata, | |
924 | struct ieee80211_mgmt *mgmt, size_t len, | |
925 | struct ieee80211_rx_status *rx_status, | |
926 | struct ieee802_11_elems *elems) | |
927 | { | |
928 | int required_len; | |
929 | ||
930 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
931 | return; | |
932 | ||
933 | /* CSA is the only action we handle for now */ | |
934 | if (mgmt->u.action.u.measurement.action_code != | |
935 | WLAN_ACTION_SPCT_CHL_SWITCH) | |
936 | return; | |
937 | ||
938 | required_len = IEEE80211_MIN_ACTION_SIZE + | |
939 | sizeof(mgmt->u.action.u.chan_switch); | |
940 | if (len < required_len) | |
941 | return; | |
942 | ||
82a8e17d LC |
943 | if (!sdata->vif.csa_active) |
944 | ieee80211_ibss_process_chanswitch(sdata, elems, false); | |
cd7760e6 SW |
945 | } |
946 | ||
2cc59e78 AQ |
947 | static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata, |
948 | struct ieee80211_mgmt *mgmt, | |
949 | size_t len) | |
950 | { | |
951 | u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code); | |
952 | ||
953 | if (len < IEEE80211_DEAUTH_FRAME_LEN) | |
954 | return; | |
955 | ||
956 | ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n", | |
957 | mgmt->sa, mgmt->da, mgmt->bssid, reason); | |
958 | sta_info_destroy_addr(sdata, mgmt->sa); | |
959 | } | |
960 | ||
6d810f10 AQ |
961 | static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, |
962 | struct ieee80211_mgmt *mgmt, | |
963 | size_t len) | |
964 | { | |
965 | u16 auth_alg, auth_transaction; | |
966 | ||
8d61ffa5 | 967 | sdata_assert_lock(sdata); |
6d810f10 AQ |
968 | |
969 | if (len < 24 + 6) | |
970 | return; | |
971 | ||
972 | auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); | |
973 | auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); | |
974 | ||
bdcbd8e0 JB |
975 | ibss_dbg(sdata, |
976 | "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n", | |
977 | mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction); | |
7bed2050 AQ |
978 | |
979 | if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) | |
980 | return; | |
981 | ||
6d810f10 AQ |
982 | /* |
983 | * IEEE 802.11 standard does not require authentication in IBSS | |
984 | * networks and most implementations do not seem to use it. | |
985 | * However, try to reply to authentication attempts if someone | |
986 | * has actually implemented this. | |
987 | */ | |
700e8ea6 | 988 | ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0, |
1672c0e3 | 989 | mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0); |
8bf11d8d JB |
990 | } |
991 | ||
46900298 | 992 | static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, |
d45c4172 | 993 | struct ieee80211_mgmt *mgmt, size_t len, |
46900298 | 994 | struct ieee80211_rx_status *rx_status, |
d45c4172 | 995 | struct ieee802_11_elems *elems) |
46900298 JB |
996 | { |
997 | struct ieee80211_local *local = sdata->local; | |
998 | int freq; | |
0c1ad2ca | 999 | struct cfg80211_bss *cbss; |
46900298 JB |
1000 | struct ieee80211_bss *bss; |
1001 | struct sta_info *sta; | |
1002 | struct ieee80211_channel *channel; | |
1003 | u64 beacon_timestamp, rx_timestamp; | |
1004 | u32 supp_rates = 0; | |
1005 | enum ieee80211_band band = rx_status->band; | |
74608aca | 1006 | enum nl80211_bss_scan_width scan_width; |
13c40c54 AS |
1007 | struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; |
1008 | bool rates_updated = false; | |
46900298 | 1009 | |
1cd8e88e | 1010 | if (elems->ds_params) |
59eb21a6 BR |
1011 | freq = ieee80211_channel_to_frequency(elems->ds_params[0], |
1012 | band); | |
46900298 JB |
1013 | else |
1014 | freq = rx_status->freq; | |
1015 | ||
1016 | channel = ieee80211_get_channel(local->hw.wiphy, freq); | |
1017 | ||
1018 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
1019 | return; | |
1020 | ||
9eba6125 | 1021 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC && |
b203ca39 | 1022 | ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) { |
46900298 JB |
1023 | |
1024 | rcu_read_lock(); | |
abe60632 | 1025 | sta = sta_info_get(sdata, mgmt->sa); |
46900298 | 1026 | |
9eba6125 | 1027 | if (elems->supp_rates) { |
2103dec1 | 1028 | supp_rates = ieee80211_sta_get_rates(sdata, elems, |
9ebb61a2 | 1029 | band, NULL); |
9eba6125 BR |
1030 | if (sta) { |
1031 | u32 prev_rates; | |
1032 | ||
1033 | prev_rates = sta->sta.supp_rates[band]; | |
1034 | /* make sure mandatory rates are always added */ | |
74608aca SW |
1035 | scan_width = NL80211_BSS_CHAN_WIDTH_20; |
1036 | if (rx_status->flag & RX_FLAG_5MHZ) | |
1037 | scan_width = NL80211_BSS_CHAN_WIDTH_5; | |
1038 | if (rx_status->flag & RX_FLAG_10MHZ) | |
1039 | scan_width = NL80211_BSS_CHAN_WIDTH_10; | |
46900298 | 1040 | |
74608aca SW |
1041 | sta->sta.supp_rates[band] = supp_rates | |
1042 | ieee80211_mandatory_rates(sband, | |
1043 | scan_width); | |
9eba6125 | 1044 | if (sta->sta.supp_rates[band] != prev_rates) { |
bdcbd8e0 JB |
1045 | ibss_dbg(sdata, |
1046 | "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", | |
1047 | sta->sta.addr, prev_rates, | |
1048 | sta->sta.supp_rates[band]); | |
13c40c54 | 1049 | rates_updated = true; |
9eba6125 | 1050 | } |
8bf11d8d JB |
1051 | } else { |
1052 | rcu_read_unlock(); | |
9eba6125 | 1053 | sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, |
52874a5e | 1054 | mgmt->sa, supp_rates); |
8bf11d8d | 1055 | } |
34e89507 | 1056 | } |
9eba6125 BR |
1057 | |
1058 | if (sta && elems->wmm_info) | |
c2c98fde | 1059 | set_sta_flag(sta, WLAN_STA_WME); |
9eba6125 | 1060 | |
074d46d1 | 1061 | if (sta && elems->ht_operation && elems->ht_cap_elem && |
3aede78a SW |
1062 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT && |
1063 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 && | |
1064 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) { | |
13c40c54 | 1065 | /* we both use HT */ |
e1a0c6b3 | 1066 | struct ieee80211_ht_cap htcap_ie; |
4bf88530 JB |
1067 | struct cfg80211_chan_def chandef; |
1068 | ||
1069 | ieee80211_ht_oper_to_chandef(channel, | |
1070 | elems->ht_operation, | |
1071 | &chandef); | |
13c40c54 | 1072 | |
e1a0c6b3 | 1073 | memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie)); |
13c40c54 AS |
1074 | |
1075 | /* | |
1076 | * fall back to HT20 if we don't use or use | |
1077 | * the other extension channel | |
1078 | */ | |
3aede78a SW |
1079 | if (chandef.center_freq1 != |
1080 | sdata->u.ibss.chandef.center_freq1) | |
e1a0c6b3 JB |
1081 | htcap_ie.cap_info &= |
1082 | cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40); | |
1083 | ||
1084 | rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap( | |
1085 | sdata, sband, &htcap_ie, sta); | |
13c40c54 AS |
1086 | } |
1087 | ||
e687f61e AQ |
1088 | if (sta && rates_updated) { |
1089 | drv_sta_rc_update(local, sdata, &sta->sta, | |
1090 | IEEE80211_RC_SUPP_RATES_CHANGED); | |
13c40c54 | 1091 | rate_control_rate_init(sta); |
e687f61e | 1092 | } |
13c40c54 | 1093 | |
9eba6125 | 1094 | rcu_read_unlock(); |
46900298 JB |
1095 | } |
1096 | ||
1097 | bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, | |
d45c4172 | 1098 | channel); |
46900298 JB |
1099 | if (!bss) |
1100 | return; | |
1101 | ||
0c1ad2ca JB |
1102 | cbss = container_of((void *)bss, struct cfg80211_bss, priv); |
1103 | ||
8cef2c9d JB |
1104 | /* same for beacon and probe response */ |
1105 | beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp); | |
46900298 JB |
1106 | |
1107 | /* check if we need to merge IBSS */ | |
1108 | ||
46900298 | 1109 | /* not an IBSS */ |
0c1ad2ca | 1110 | if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) |
46900298 JB |
1111 | goto put_bss; |
1112 | ||
1113 | /* different channel */ | |
55de908a | 1114 | if (sdata->u.ibss.fixed_channel && |
3aede78a | 1115 | sdata->u.ibss.chandef.chan != cbss->channel) |
46900298 JB |
1116 | goto put_bss; |
1117 | ||
1118 | /* different SSID */ | |
1119 | if (elems->ssid_len != sdata->u.ibss.ssid_len || | |
1120 | memcmp(elems->ssid, sdata->u.ibss.ssid, | |
1121 | sdata->u.ibss.ssid_len)) | |
1122 | goto put_bss; | |
1123 | ||
cd7760e6 | 1124 | /* process channel switch */ |
82a8e17d LC |
1125 | if (sdata->vif.csa_active || |
1126 | ieee80211_ibss_process_chanswitch(sdata, elems, true)) | |
cd7760e6 SW |
1127 | goto put_bss; |
1128 | ||
34e8f082 | 1129 | /* same BSSID */ |
b203ca39 | 1130 | if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) |
34e8f082 AF |
1131 | goto put_bss; |
1132 | ||
cd7760e6 SW |
1133 | /* we use a fixed BSSID */ |
1134 | if (sdata->u.ibss.fixed_bssid) | |
1135 | goto put_bss; | |
1136 | ||
f4bda337 TP |
1137 | if (ieee80211_have_rx_timestamp(rx_status)) { |
1138 | /* time when timestamp field was received */ | |
1139 | rx_timestamp = | |
1140 | ieee80211_calculate_rx_timestamp(local, rx_status, | |
1141 | len + FCS_LEN, 24); | |
24487981 JB |
1142 | } else { |
1143 | /* | |
1144 | * second best option: get current TSF | |
1145 | * (will return -1 if not supported) | |
1146 | */ | |
37a41b4a | 1147 | rx_timestamp = drv_get_tsf(local, sdata); |
24487981 | 1148 | } |
46900298 | 1149 | |
bdcbd8e0 JB |
1150 | ibss_dbg(sdata, |
1151 | "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", | |
1152 | mgmt->sa, mgmt->bssid, | |
1153 | (unsigned long long)rx_timestamp, | |
1154 | (unsigned long long)beacon_timestamp, | |
1155 | (unsigned long long)(rx_timestamp - beacon_timestamp), | |
1156 | jiffies); | |
46900298 JB |
1157 | |
1158 | if (beacon_timestamp > rx_timestamp) { | |
bdcbd8e0 JB |
1159 | ibss_dbg(sdata, |
1160 | "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", | |
1161 | mgmt->bssid); | |
46900298 | 1162 | ieee80211_sta_join_ibss(sdata, bss); |
2103dec1 | 1163 | supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL); |
34e89507 | 1164 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, |
52874a5e | 1165 | supp_rates); |
8bf11d8d | 1166 | rcu_read_unlock(); |
46900298 JB |
1167 | } |
1168 | ||
1169 | put_bss: | |
1170 | ieee80211_rx_bss_put(local, bss); | |
1171 | } | |
1172 | ||
8bf11d8d JB |
1173 | void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, |
1174 | const u8 *bssid, const u8 *addr, | |
1175 | u32 supp_rates) | |
46900298 | 1176 | { |
2e10d330 | 1177 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
46900298 JB |
1178 | struct ieee80211_local *local = sdata->local; |
1179 | struct sta_info *sta; | |
55de908a | 1180 | struct ieee80211_chanctx_conf *chanctx_conf; |
b422c6cd | 1181 | struct ieee80211_supported_band *sband; |
74608aca | 1182 | enum nl80211_bss_scan_width scan_width; |
55de908a | 1183 | int band; |
46900298 | 1184 | |
af8cdcd8 JB |
1185 | /* |
1186 | * XXX: Consider removing the least recently used entry and | |
1187 | * allow new one to be added. | |
1188 | */ | |
46900298 | 1189 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { |
bdcbd8e0 | 1190 | net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
e87cc472 | 1191 | sdata->name, addr); |
8bf11d8d | 1192 | return; |
46900298 JB |
1193 | } |
1194 | ||
2e10d330 | 1195 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) |
8bf11d8d | 1196 | return; |
2e10d330 | 1197 | |
b203ca39 | 1198 | if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) |
8bf11d8d | 1199 | return; |
46900298 | 1200 | |
55de908a JB |
1201 | rcu_read_lock(); |
1202 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
1203 | if (WARN_ON_ONCE(!chanctx_conf)) { | |
1204 | rcu_read_unlock(); | |
1205 | return; | |
1206 | } | |
4bf88530 | 1207 | band = chanctx_conf->def.chan->band; |
74608aca | 1208 | scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); |
55de908a JB |
1209 | rcu_read_unlock(); |
1210 | ||
8bf11d8d | 1211 | sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); |
46900298 | 1212 | if (!sta) |
8bf11d8d | 1213 | return; |
46900298 | 1214 | |
c8716d9d | 1215 | sta->last_rx = jiffies; |
d9a7ddb0 | 1216 | |
46900298 | 1217 | /* make sure mandatory rates are always added */ |
b422c6cd | 1218 | sband = local->hw.wiphy->bands[band]; |
46900298 | 1219 | sta->sta.supp_rates[band] = supp_rates | |
74608aca | 1220 | ieee80211_mandatory_rates(sband, scan_width); |
46900298 | 1221 | |
8bf11d8d JB |
1222 | spin_lock(&ifibss->incomplete_lock); |
1223 | list_add(&sta->list, &ifibss->incomplete_stations); | |
1224 | spin_unlock(&ifibss->incomplete_lock); | |
1225 | ieee80211_queue_work(&local->hw, &sdata->work); | |
46900298 JB |
1226 | } |
1227 | ||
dad9defd AQ |
1228 | static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata) |
1229 | { | |
1230 | struct ieee80211_local *local = sdata->local; | |
1231 | struct sta_info *sta, *tmp; | |
1232 | unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT; | |
1233 | unsigned long exp_rsn_time = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT; | |
1234 | ||
1235 | mutex_lock(&local->sta_mtx); | |
1236 | ||
1237 | list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { | |
1238 | if (sdata != sta->sdata) | |
1239 | continue; | |
1240 | ||
1241 | if (time_after(jiffies, sta->last_rx + exp_time) || | |
1242 | (time_after(jiffies, sta->last_rx + exp_rsn_time) && | |
1243 | sta->sta_state != IEEE80211_STA_AUTHORIZED)) { | |
1244 | sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n", | |
1245 | sta->sta_state != IEEE80211_STA_AUTHORIZED ? | |
1246 | "not authorized " : "", sta->sta.addr); | |
1247 | ||
1248 | WARN_ON(__sta_info_destroy(sta)); | |
1249 | } | |
1250 | } | |
1251 | ||
1252 | mutex_unlock(&local->sta_mtx); | |
1253 | } | |
1254 | ||
ce9058ae BP |
1255 | /* |
1256 | * This function is called with state == IEEE80211_IBSS_MLME_JOINED | |
1257 | */ | |
46900298 JB |
1258 | |
1259 | static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) | |
1260 | { | |
1261 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
7ca15a0a | 1262 | enum nl80211_bss_scan_width scan_width; |
46900298 | 1263 | |
8d61ffa5 | 1264 | sdata_assert_lock(sdata); |
7a17a33c | 1265 | |
af8cdcd8 JB |
1266 | mod_timer(&ifibss->timer, |
1267 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 | 1268 | |
dad9defd | 1269 | ieee80211_ibss_sta_expire(sdata); |
af8cdcd8 | 1270 | |
450aae3d S |
1271 | if (time_before(jiffies, ifibss->last_scan_completed + |
1272 | IEEE80211_IBSS_MERGE_INTERVAL)) | |
1273 | return; | |
1274 | ||
46900298 JB |
1275 | if (ieee80211_sta_active_ibss(sdata)) |
1276 | return; | |
1277 | ||
c037b836 | 1278 | if (ifibss->fixed_channel) |
46900298 JB |
1279 | return; |
1280 | ||
bdcbd8e0 JB |
1281 | sdata_info(sdata, |
1282 | "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); | |
46900298 | 1283 | |
7ca15a0a | 1284 | scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); |
34bcf715 | 1285 | ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len, |
7ca15a0a | 1286 | NULL, scan_width); |
46900298 JB |
1287 | } |
1288 | ||
af8cdcd8 | 1289 | static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
1290 | { |
1291 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
46900298 | 1292 | u8 bssid[ETH_ALEN]; |
46900298 JB |
1293 | u16 capability; |
1294 | int i; | |
1295 | ||
8d61ffa5 | 1296 | sdata_assert_lock(sdata); |
7a17a33c | 1297 | |
af8cdcd8 | 1298 | if (ifibss->fixed_bssid) { |
46900298 JB |
1299 | memcpy(bssid, ifibss->bssid, ETH_ALEN); |
1300 | } else { | |
1301 | /* Generate random, not broadcast, locally administered BSSID. Mix in | |
1302 | * own MAC address to make sure that devices that do not have proper | |
1303 | * random number generator get different BSSID. */ | |
1304 | get_random_bytes(bssid, ETH_ALEN); | |
1305 | for (i = 0; i < ETH_ALEN; i++) | |
47846c9b | 1306 | bssid[i] ^= sdata->vif.addr[i]; |
46900298 JB |
1307 | bssid[0] &= ~0x01; |
1308 | bssid[0] |= 0x02; | |
1309 | } | |
1310 | ||
bdcbd8e0 | 1311 | sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); |
46900298 | 1312 | |
46900298 JB |
1313 | capability = WLAN_CAPABILITY_IBSS; |
1314 | ||
fffd0934 | 1315 | if (ifibss->privacy) |
46900298 JB |
1316 | capability |= WLAN_CAPABILITY_PRIVACY; |
1317 | else | |
1318 | sdata->drop_unencrypted = 0; | |
1319 | ||
57c4d7b4 | 1320 | __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, |
75a423f4 | 1321 | &ifibss->chandef, ifibss->basic_rates, |
c13a765b | 1322 | capability, 0, true); |
46900298 JB |
1323 | } |
1324 | ||
ce9058ae BP |
1325 | /* |
1326 | * This function is called with state == IEEE80211_IBSS_MLME_SEARCH | |
1327 | */ | |
1328 | ||
af8cdcd8 | 1329 | static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
1330 | { |
1331 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1332 | struct ieee80211_local *local = sdata->local; | |
0c1ad2ca | 1333 | struct cfg80211_bss *cbss; |
af8cdcd8 | 1334 | struct ieee80211_channel *chan = NULL; |
46900298 | 1335 | const u8 *bssid = NULL; |
7ca15a0a | 1336 | enum nl80211_bss_scan_width scan_width; |
46900298 | 1337 | int active_ibss; |
e0d61887 | 1338 | u16 capability; |
46900298 | 1339 | |
8d61ffa5 | 1340 | sdata_assert_lock(sdata); |
7a17a33c | 1341 | |
46900298 | 1342 | active_ibss = ieee80211_sta_active_ibss(sdata); |
bdcbd8e0 | 1343 | ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); |
46900298 JB |
1344 | |
1345 | if (active_ibss) | |
af8cdcd8 | 1346 | return; |
46900298 | 1347 | |
e0d61887 | 1348 | capability = WLAN_CAPABILITY_IBSS; |
fffd0934 | 1349 | if (ifibss->privacy) |
e0d61887 | 1350 | capability |= WLAN_CAPABILITY_PRIVACY; |
af8cdcd8 JB |
1351 | if (ifibss->fixed_bssid) |
1352 | bssid = ifibss->bssid; | |
1353 | if (ifibss->fixed_channel) | |
3aede78a | 1354 | chan = ifibss->chandef.chan; |
af8cdcd8 | 1355 | if (!is_zero_ether_addr(ifibss->bssid)) |
46900298 | 1356 | bssid = ifibss->bssid; |
0c1ad2ca JB |
1357 | cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, |
1358 | ifibss->ssid, ifibss->ssid_len, | |
1359 | WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY, | |
1360 | capability); | |
1361 | ||
1362 | if (cbss) { | |
1363 | struct ieee80211_bss *bss; | |
46900298 | 1364 | |
0c1ad2ca | 1365 | bss = (void *)cbss->priv; |
bdcbd8e0 JB |
1366 | ibss_dbg(sdata, |
1367 | "sta_find_ibss: selected %pM current %pM\n", | |
1368 | cbss->bssid, ifibss->bssid); | |
1369 | sdata_info(sdata, | |
1370 | "Selected IBSS BSSID %pM based on configured SSID\n", | |
1371 | cbss->bssid); | |
46900298 | 1372 | |
af8cdcd8 | 1373 | ieee80211_sta_join_ibss(sdata, bss); |
46900298 | 1374 | ieee80211_rx_bss_put(local, bss); |
af8cdcd8 | 1375 | return; |
d419b9f0 | 1376 | } |
46900298 | 1377 | |
d8eb741e AQ |
1378 | /* if a fixed bssid and a fixed freq have been provided create the IBSS |
1379 | * directly and do not waste time scanning | |
1380 | */ | |
1381 | if (ifibss->fixed_bssid && ifibss->fixed_channel) { | |
1382 | sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n", | |
1383 | bssid); | |
1384 | ieee80211_sta_create_ibss(sdata); | |
1385 | return; | |
1386 | } | |
1387 | ||
1388 | ||
bdcbd8e0 | 1389 | ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); |
46900298 JB |
1390 | |
1391 | /* Selected IBSS not found in current scan results - try to scan */ | |
ce9058ae | 1392 | if (time_after(jiffies, ifibss->last_scan_completed + |
46900298 | 1393 | IEEE80211_SCAN_INTERVAL)) { |
bdcbd8e0 | 1394 | sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); |
46900298 | 1395 | |
7ca15a0a | 1396 | scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); |
34bcf715 | 1397 | ieee80211_request_ibss_scan(sdata, ifibss->ssid, |
7ca15a0a SW |
1398 | ifibss->ssid_len, chan, |
1399 | scan_width); | |
ce9058ae | 1400 | } else { |
46900298 JB |
1401 | int interval = IEEE80211_SCAN_INTERVAL; |
1402 | ||
1403 | if (time_after(jiffies, ifibss->ibss_join_req + | |
55de908a JB |
1404 | IEEE80211_IBSS_JOIN_TIMEOUT)) |
1405 | ieee80211_sta_create_ibss(sdata); | |
46900298 | 1406 | |
af8cdcd8 JB |
1407 | mod_timer(&ifibss->timer, |
1408 | round_jiffies(jiffies + interval)); | |
46900298 | 1409 | } |
46900298 JB |
1410 | } |
1411 | ||
1412 | static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, | |
c269a203 | 1413 | struct sk_buff *req) |
46900298 | 1414 | { |
c269a203 | 1415 | struct ieee80211_mgmt *mgmt = (void *)req->data; |
46900298 JB |
1416 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
1417 | struct ieee80211_local *local = sdata->local; | |
c269a203 | 1418 | int tx_last_beacon, len = req->len; |
46900298 | 1419 | struct sk_buff *skb; |
c3ffeab4 | 1420 | struct beacon_data *presp; |
46900298 JB |
1421 | u8 *pos, *end; |
1422 | ||
8d61ffa5 | 1423 | sdata_assert_lock(sdata); |
7a17a33c | 1424 | |
40b275b6 | 1425 | presp = rcu_dereference_protected(ifibss->presp, |
8d61ffa5 | 1426 | lockdep_is_held(&sdata->wdev.mtx)); |
40b275b6 | 1427 | |
46900298 | 1428 | if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || |
40b275b6 | 1429 | len < 24 + 2 || !presp) |
46900298 JB |
1430 | return; |
1431 | ||
24487981 | 1432 | tx_last_beacon = drv_tx_last_beacon(local); |
46900298 | 1433 | |
bdcbd8e0 JB |
1434 | ibss_dbg(sdata, |
1435 | "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n", | |
1436 | mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon); | |
46900298 | 1437 | |
1ed76487 | 1438 | if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) |
46900298 JB |
1439 | return; |
1440 | ||
b203ca39 | 1441 | if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && |
888d04df | 1442 | !is_broadcast_ether_addr(mgmt->bssid)) |
46900298 JB |
1443 | return; |
1444 | ||
1445 | end = ((u8 *) mgmt) + len; | |
1446 | pos = mgmt->u.probe_req.variable; | |
1447 | if (pos[0] != WLAN_EID_SSID || | |
1448 | pos + 2 + pos[1] > end) { | |
bdcbd8e0 JB |
1449 | ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", |
1450 | mgmt->sa); | |
46900298 JB |
1451 | return; |
1452 | } | |
1453 | if (pos[1] != 0 && | |
1454 | (pos[1] != ifibss->ssid_len || | |
0da780c2 | 1455 | memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { |
46900298 JB |
1456 | /* Ignore ProbeReq for foreign SSID */ |
1457 | return; | |
1458 | } | |
1459 | ||
1460 | /* Reply with ProbeResp */ | |
c3ffeab4 | 1461 | skb = dev_alloc_skb(local->tx_headroom + presp->head_len); |
46900298 JB |
1462 | if (!skb) |
1463 | return; | |
1464 | ||
c3ffeab4 JB |
1465 | skb_reserve(skb, local->tx_headroom); |
1466 | memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len); | |
1467 | ||
1468 | memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN); | |
1469 | ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa); | |
62ae67be JB |
1470 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
1471 | ieee80211_tx_skb(sdata, skb); | |
46900298 JB |
1472 | } |
1473 | ||
d45c4172 EG |
1474 | static |
1475 | void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata, | |
1476 | struct ieee80211_mgmt *mgmt, size_t len, | |
1477 | struct ieee80211_rx_status *rx_status) | |
46900298 JB |
1478 | { |
1479 | size_t baselen; | |
1480 | struct ieee802_11_elems elems; | |
1481 | ||
d45c4172 EG |
1482 | BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) != |
1483 | offsetof(typeof(mgmt->u.beacon), variable)); | |
1484 | ||
1485 | /* | |
1486 | * either beacon or probe_resp but the variable field is at the | |
1487 | * same offset | |
1488 | */ | |
46900298 JB |
1489 | baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; |
1490 | if (baselen > len) | |
1491 | return; | |
1492 | ||
1493 | ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, | |
b2e506bf | 1494 | false, &elems); |
46900298 | 1495 | |
d45c4172 | 1496 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); |
46900298 JB |
1497 | } |
1498 | ||
1fa57d01 JB |
1499 | void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, |
1500 | struct sk_buff *skb) | |
46900298 JB |
1501 | { |
1502 | struct ieee80211_rx_status *rx_status; | |
1503 | struct ieee80211_mgmt *mgmt; | |
1504 | u16 fc; | |
cd7760e6 SW |
1505 | struct ieee802_11_elems elems; |
1506 | int ies_len; | |
46900298 | 1507 | |
f1d58c25 | 1508 | rx_status = IEEE80211_SKB_RXCB(skb); |
46900298 JB |
1509 | mgmt = (struct ieee80211_mgmt *) skb->data; |
1510 | fc = le16_to_cpu(mgmt->frame_control); | |
1511 | ||
8d61ffa5 | 1512 | sdata_lock(sdata); |
7a17a33c | 1513 | |
c926d006 TH |
1514 | if (!sdata->u.ibss.ssid_len) |
1515 | goto mgmt_out; /* not ready to merge yet */ | |
1516 | ||
46900298 JB |
1517 | switch (fc & IEEE80211_FCTL_STYPE) { |
1518 | case IEEE80211_STYPE_PROBE_REQ: | |
c269a203 | 1519 | ieee80211_rx_mgmt_probe_req(sdata, skb); |
46900298 JB |
1520 | break; |
1521 | case IEEE80211_STYPE_PROBE_RESP: | |
46900298 | 1522 | case IEEE80211_STYPE_BEACON: |
d45c4172 EG |
1523 | ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len, |
1524 | rx_status); | |
46900298 JB |
1525 | break; |
1526 | case IEEE80211_STYPE_AUTH: | |
1527 | ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); | |
1528 | break; | |
2cc59e78 AQ |
1529 | case IEEE80211_STYPE_DEAUTH: |
1530 | ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); | |
1531 | break; | |
cd7760e6 SW |
1532 | case IEEE80211_STYPE_ACTION: |
1533 | switch (mgmt->u.action.category) { | |
1534 | case WLAN_CATEGORY_SPECTRUM_MGMT: | |
1535 | ies_len = skb->len - | |
1536 | offsetof(struct ieee80211_mgmt, | |
1537 | u.action.u.chan_switch.variable); | |
1538 | ||
1539 | if (ies_len < 0) | |
1540 | break; | |
1541 | ||
1542 | ieee802_11_parse_elems( | |
1543 | mgmt->u.action.u.chan_switch.variable, | |
1544 | ies_len, true, &elems); | |
1545 | ||
1546 | if (elems.parse_error) | |
1547 | break; | |
1548 | ||
1549 | ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len, | |
1550 | rx_status, &elems); | |
1551 | break; | |
1552 | } | |
46900298 | 1553 | } |
7a17a33c | 1554 | |
c926d006 | 1555 | mgmt_out: |
8d61ffa5 | 1556 | sdata_unlock(sdata); |
46900298 JB |
1557 | } |
1558 | ||
1fa57d01 | 1559 | void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) |
46900298 | 1560 | { |
1fa57d01 | 1561 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
8bf11d8d | 1562 | struct sta_info *sta; |
46900298 | 1563 | |
8d61ffa5 | 1564 | sdata_lock(sdata); |
7a17a33c JB |
1565 | |
1566 | /* | |
1567 | * Work could be scheduled after scan or similar | |
1568 | * when we aren't even joined (or trying) with a | |
1569 | * network. | |
1570 | */ | |
1571 | if (!ifibss->ssid_len) | |
1572 | goto out; | |
46900298 | 1573 | |
8bf11d8d JB |
1574 | spin_lock_bh(&ifibss->incomplete_lock); |
1575 | while (!list_empty(&ifibss->incomplete_stations)) { | |
1576 | sta = list_first_entry(&ifibss->incomplete_stations, | |
1577 | struct sta_info, list); | |
1578 | list_del(&sta->list); | |
1579 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1580 | ||
52874a5e | 1581 | ieee80211_ibss_finish_sta(sta); |
8bf11d8d JB |
1582 | rcu_read_unlock(); |
1583 | spin_lock_bh(&ifibss->incomplete_lock); | |
1584 | } | |
1585 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1586 | ||
46900298 JB |
1587 | switch (ifibss->state) { |
1588 | case IEEE80211_IBSS_MLME_SEARCH: | |
1589 | ieee80211_sta_find_ibss(sdata); | |
1590 | break; | |
1591 | case IEEE80211_IBSS_MLME_JOINED: | |
1592 | ieee80211_sta_merge_ibss(sdata); | |
1593 | break; | |
1594 | default: | |
1595 | WARN_ON(1); | |
1596 | break; | |
1597 | } | |
46900298 | 1598 | |
7a17a33c | 1599 | out: |
8d61ffa5 | 1600 | sdata_unlock(sdata); |
3a4d4aa2 JB |
1601 | } |
1602 | ||
46900298 JB |
1603 | static void ieee80211_ibss_timer(unsigned long data) |
1604 | { | |
1605 | struct ieee80211_sub_if_data *sdata = | |
1606 | (struct ieee80211_sub_if_data *) data; | |
5bb644a0 | 1607 | |
a6182943 | 1608 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
5bb644a0 | 1609 | } |
5bb644a0 | 1610 | |
46900298 JB |
1611 | void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) |
1612 | { | |
1613 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1614 | ||
46900298 JB |
1615 | setup_timer(&ifibss->timer, ieee80211_ibss_timer, |
1616 | (unsigned long) sdata); | |
8bf11d8d JB |
1617 | INIT_LIST_HEAD(&ifibss->incomplete_stations); |
1618 | spin_lock_init(&ifibss->incomplete_lock); | |
cd7760e6 SW |
1619 | INIT_WORK(&ifibss->csa_connection_drop_work, |
1620 | ieee80211_csa_connection_drop_work); | |
46900298 JB |
1621 | } |
1622 | ||
1623 | /* scan finished notification */ | |
1624 | void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) | |
1625 | { | |
af8cdcd8 | 1626 | struct ieee80211_sub_if_data *sdata; |
46900298 | 1627 | |
29b4a4f7 JB |
1628 | mutex_lock(&local->iflist_mtx); |
1629 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 1630 | if (!ieee80211_sdata_running(sdata)) |
0e41f715 | 1631 | continue; |
af8cdcd8 JB |
1632 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
1633 | continue; | |
1634 | sdata->u.ibss.last_scan_completed = jiffies; | |
7a17a33c | 1635 | ieee80211_queue_work(&local->hw, &sdata->work); |
46900298 | 1636 | } |
29b4a4f7 | 1637 | mutex_unlock(&local->iflist_mtx); |
46900298 JB |
1638 | } |
1639 | ||
af8cdcd8 JB |
1640 | int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, |
1641 | struct cfg80211_ibss_params *params) | |
1642 | { | |
ff3cc5f4 | 1643 | u32 changed = 0; |
2103dec1 SW |
1644 | u32 rate_flags; |
1645 | struct ieee80211_supported_band *sband; | |
1646 | int i; | |
af8cdcd8 | 1647 | |
af8cdcd8 JB |
1648 | if (params->bssid) { |
1649 | memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); | |
1650 | sdata->u.ibss.fixed_bssid = true; | |
1651 | } else | |
1652 | sdata->u.ibss.fixed_bssid = false; | |
1653 | ||
fffd0934 | 1654 | sdata->u.ibss.privacy = params->privacy; |
267335d6 | 1655 | sdata->u.ibss.control_port = params->control_port; |
8e8d347d | 1656 | sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs; |
fbd2c8dc | 1657 | sdata->u.ibss.basic_rates = params->basic_rates; |
2103dec1 SW |
1658 | |
1659 | /* fix basic_rates if channel does not support these rates */ | |
1660 | rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef); | |
1661 | sband = sdata->local->hw.wiphy->bands[params->chandef.chan->band]; | |
1662 | for (i = 0; i < sband->n_bitrates; i++) { | |
1663 | if ((rate_flags & sband->bitrates[i].flags) != rate_flags) | |
1664 | sdata->u.ibss.basic_rates &= ~BIT(i); | |
1665 | } | |
dd5b4cc7 FF |
1666 | memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, |
1667 | sizeof(params->mcast_rate)); | |
fffd0934 | 1668 | |
57c4d7b4 JB |
1669 | sdata->vif.bss_conf.beacon_int = params->beacon_interval; |
1670 | ||
3aede78a | 1671 | sdata->u.ibss.chandef = params->chandef; |
af8cdcd8 JB |
1672 | sdata->u.ibss.fixed_channel = params->channel_fixed; |
1673 | ||
1674 | if (params->ie) { | |
1675 | sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, | |
1676 | GFP_KERNEL); | |
1677 | if (sdata->u.ibss.ie) | |
1678 | sdata->u.ibss.ie_len = params->ie_len; | |
1679 | } | |
1680 | ||
af8cdcd8 JB |
1681 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; |
1682 | sdata->u.ibss.ibss_join_req = jiffies; | |
1683 | ||
badecb00 | 1684 | memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); |
0e41f715 JB |
1685 | sdata->u.ibss.ssid_len = params->ssid_len; |
1686 | ||
822854b0 SW |
1687 | memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa, |
1688 | sizeof(sdata->u.ibss.ht_capa)); | |
1689 | memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask, | |
1690 | sizeof(sdata->u.ibss.ht_capa_mask)); | |
1691 | ||
ff3cc5f4 SW |
1692 | /* |
1693 | * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is | |
1694 | * reserved, but an HT STA shall protect HT transmissions as though | |
1695 | * the HT Protection field were set to non-HT mixed mode. | |
1696 | * | |
1697 | * In an IBSS, the RIFS Mode field of the HT Operation element is | |
1698 | * also reserved, but an HT STA shall operate as though this field | |
1699 | * were set to 1. | |
1700 | */ | |
1701 | ||
1702 | sdata->vif.bss_conf.ht_operation_mode |= | |
1703 | IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | |
1704 | | IEEE80211_HT_PARAM_RIFS_MODE; | |
1705 | ||
1706 | changed |= BSS_CHANGED_HT; | |
1707 | ieee80211_bss_info_change_notify(sdata, changed); | |
1708 | ||
04ecd257 JB |
1709 | sdata->smps_mode = IEEE80211_SMPS_OFF; |
1710 | sdata->needed_rx_chains = sdata->local->rx_chains; | |
1711 | ||
64592c8f | 1712 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
af8cdcd8 JB |
1713 | |
1714 | return 0; | |
1715 | } | |
1716 | ||
1717 | int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) | |
1718 | { | |
5ea096c0 | 1719 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
5ea096c0 | 1720 | |
871a4180 | 1721 | ieee80211_ibss_disconnect(sdata); |
b78a4932 | 1722 | ifibss->ssid_len = 0; |
871a4180 | 1723 | memset(ifibss->bssid, 0, ETH_ALEN); |
af8cdcd8 JB |
1724 | |
1725 | /* remove beacon */ | |
1726 | kfree(sdata->u.ibss.ie); | |
822854b0 SW |
1727 | |
1728 | /* on the next join, re-program HT parameters */ | |
1729 | memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa)); | |
1730 | memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask)); | |
1731 | ||
af8cdcd8 | 1732 | synchronize_rcu(); |
af8cdcd8 | 1733 | |
35f20c14 | 1734 | skb_queue_purge(&sdata->skb_queue); |
5cff20e6 | 1735 | |
bc05d19f | 1736 | del_timer_sync(&sdata->u.ibss.timer); |
7a17a33c | 1737 | |
af8cdcd8 JB |
1738 | return 0; |
1739 | } |