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Commit | Line | Data |
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0a51b27e | 1 | /* |
5484e237 JB |
2 | * Scanning implementation |
3 | * | |
0a51b27e JB |
4 | * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> |
5 | * Copyright 2004, Instant802 Networks, Inc. | |
6 | * Copyright 2005, Devicescape Software, Inc. | |
7 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
8 | * Copyright 2007, Michael Wu <flamingice@sourmilk.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 | ||
0a51b27e | 15 | #include <linux/if_arp.h> |
888d04df | 16 | #include <linux/etherdevice.h> |
078e1e60 | 17 | #include <linux/rtnetlink.h> |
e8db0be1 | 18 | #include <linux/pm_qos.h> |
df13cce5 | 19 | #include <net/sch_generic.h> |
5a0e3ad6 | 20 | #include <linux/slab.h> |
bc3b2d7f | 21 | #include <linux/export.h> |
0a51b27e | 22 | #include <net/mac80211.h> |
0a51b27e JB |
23 | |
24 | #include "ieee80211_i.h" | |
24487981 | 25 | #include "driver-ops.h" |
5484e237 | 26 | #include "mesh.h" |
0a51b27e JB |
27 | |
28 | #define IEEE80211_PROBE_DELAY (HZ / 33) | |
29 | #define IEEE80211_CHANNEL_TIME (HZ / 33) | |
96f7e739 | 30 | #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 8) |
0a51b27e | 31 | |
00d3f14c | 32 | static void ieee80211_rx_bss_free(struct cfg80211_bss *cbss) |
5484e237 | 33 | { |
0c1ad2ca | 34 | struct ieee80211_bss *bss = (void *)cbss->priv; |
5484e237 | 35 | |
5484e237 JB |
36 | kfree(bss_mesh_id(bss)); |
37 | kfree(bss_mesh_cfg(bss)); | |
5484e237 JB |
38 | } |
39 | ||
40 | void ieee80211_rx_bss_put(struct ieee80211_local *local, | |
c2b13452 | 41 | struct ieee80211_bss *bss) |
5484e237 | 42 | { |
0c1ad2ca JB |
43 | if (!bss) |
44 | return; | |
45 | cfg80211_put_bss(container_of((void *)bss, struct cfg80211_bss, priv)); | |
5484e237 JB |
46 | } |
47 | ||
ab13315a KV |
48 | static bool is_uapsd_supported(struct ieee802_11_elems *elems) |
49 | { | |
50 | u8 qos_info; | |
51 | ||
52 | if (elems->wmm_info && elems->wmm_info_len == 7 | |
53 | && elems->wmm_info[5] == 1) | |
54 | qos_info = elems->wmm_info[6]; | |
55 | else if (elems->wmm_param && elems->wmm_param_len == 24 | |
56 | && elems->wmm_param[5] == 1) | |
57 | qos_info = elems->wmm_param[6]; | |
58 | else | |
59 | /* no valid wmm information or parameter element found */ | |
60 | return false; | |
61 | ||
62 | return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD; | |
63 | } | |
64 | ||
c2b13452 | 65 | struct ieee80211_bss * |
5484e237 JB |
66 | ieee80211_bss_info_update(struct ieee80211_local *local, |
67 | struct ieee80211_rx_status *rx_status, | |
68 | struct ieee80211_mgmt *mgmt, | |
69 | size_t len, | |
70 | struct ieee802_11_elems *elems, | |
2a519311 JB |
71 | struct ieee80211_channel *channel, |
72 | bool beacon) | |
5484e237 | 73 | { |
0c1ad2ca | 74 | struct cfg80211_bss *cbss; |
c2b13452 | 75 | struct ieee80211_bss *bss; |
f0b058b6 | 76 | int clen, srlen; |
2a519311 JB |
77 | s32 signal = 0; |
78 | ||
77965c97 | 79 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
2a519311 | 80 | signal = rx_status->signal * 100; |
77965c97 | 81 | else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) |
2a519311 | 82 | signal = (rx_status->signal * 100) / local->hw.max_signal; |
2a519311 | 83 | |
0c1ad2ca JB |
84 | cbss = cfg80211_inform_bss_frame(local->hw.wiphy, channel, |
85 | mgmt, len, signal, GFP_ATOMIC); | |
5484e237 | 86 | |
0c1ad2ca | 87 | if (!cbss) |
00d3f14c JB |
88 | return NULL; |
89 | ||
0c1ad2ca JB |
90 | cbss->free_priv = ieee80211_rx_bss_free; |
91 | bss = (void *)cbss->priv; | |
5484e237 | 92 | |
fcff4f10 PS |
93 | if (elems->parse_error) { |
94 | if (beacon) | |
95 | bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON; | |
96 | else | |
97 | bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP; | |
98 | } else { | |
99 | if (beacon) | |
100 | bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON; | |
101 | else | |
102 | bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP; | |
103 | } | |
104 | ||
5484e237 | 105 | /* save the ERP value so that it is available at association time */ |
fcff4f10 PS |
106 | if (elems->erp_info && elems->erp_info_len >= 1 && |
107 | (!elems->parse_error || | |
108 | !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) { | |
5484e237 | 109 | bss->erp_value = elems->erp_info[0]; |
3db1cd5c | 110 | bss->has_erp_value = true; |
fcff4f10 PS |
111 | if (!elems->parse_error) |
112 | bss->valid_data |= IEEE80211_BSS_VALID_ERP; | |
5484e237 JB |
113 | } |
114 | ||
fcff4f10 PS |
115 | if (elems->tim && (!elems->parse_error || |
116 | !(bss->valid_data & IEEE80211_BSS_VALID_DTIM))) { | |
5484e237 JB |
117 | struct ieee80211_tim_ie *tim_ie = |
118 | (struct ieee80211_tim_ie *)elems->tim; | |
119 | bss->dtim_period = tim_ie->dtim_period; | |
fcff4f10 PS |
120 | if (!elems->parse_error) |
121 | bss->valid_data |= IEEE80211_BSS_VALID_DTIM; | |
5484e237 JB |
122 | } |
123 | ||
e5b900d2 JB |
124 | /* If the beacon had no TIM IE, or it was invalid, use 1 */ |
125 | if (beacon && !bss->dtim_period) | |
126 | bss->dtim_period = 1; | |
127 | ||
f0b058b6 | 128 | /* replace old supported rates if we get new values */ |
fcff4f10 PS |
129 | if (!elems->parse_error || |
130 | !(bss->valid_data & IEEE80211_BSS_VALID_RATES)) { | |
131 | srlen = 0; | |
132 | if (elems->supp_rates) { | |
133 | clen = IEEE80211_MAX_SUPP_RATES; | |
134 | if (clen > elems->supp_rates_len) | |
135 | clen = elems->supp_rates_len; | |
136 | memcpy(bss->supp_rates, elems->supp_rates, clen); | |
137 | srlen += clen; | |
138 | } | |
139 | if (elems->ext_supp_rates) { | |
140 | clen = IEEE80211_MAX_SUPP_RATES - srlen; | |
141 | if (clen > elems->ext_supp_rates_len) | |
142 | clen = elems->ext_supp_rates_len; | |
143 | memcpy(bss->supp_rates + srlen, elems->ext_supp_rates, | |
144 | clen); | |
145 | srlen += clen; | |
146 | } | |
147 | if (srlen) { | |
148 | bss->supp_rates_len = srlen; | |
149 | if (!elems->parse_error) | |
150 | bss->valid_data |= IEEE80211_BSS_VALID_RATES; | |
151 | } | |
5484e237 | 152 | } |
5484e237 | 153 | |
fcff4f10 PS |
154 | if (!elems->parse_error || |
155 | !(bss->valid_data & IEEE80211_BSS_VALID_WMM)) { | |
156 | bss->wmm_used = elems->wmm_param || elems->wmm_info; | |
157 | bss->uapsd_supported = is_uapsd_supported(elems); | |
158 | if (!elems->parse_error) | |
159 | bss->valid_data |= IEEE80211_BSS_VALID_WMM; | |
160 | } | |
5484e237 JB |
161 | |
162 | if (!beacon) | |
163 | bss->last_probe_resp = jiffies; | |
164 | ||
5484e237 JB |
165 | return bss; |
166 | } | |
0a51b27e | 167 | |
d48b2968 | 168 | void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb) |
98c8fccf | 169 | { |
f1d58c25 | 170 | struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); |
d48b2968 JB |
171 | struct ieee80211_sub_if_data *sdata1, *sdata2; |
172 | struct ieee80211_mgmt *mgmt = (void *)skb->data; | |
c2b13452 | 173 | struct ieee80211_bss *bss; |
98c8fccf JB |
174 | u8 *elements; |
175 | struct ieee80211_channel *channel; | |
176 | size_t baselen; | |
177 | int freq; | |
d48b2968 | 178 | bool beacon; |
98c8fccf JB |
179 | struct ieee802_11_elems elems; |
180 | ||
d48b2968 JB |
181 | if (skb->len < 24 || |
182 | (!ieee80211_is_probe_resp(mgmt->frame_control) && | |
183 | !ieee80211_is_beacon(mgmt->frame_control))) | |
184 | return; | |
98c8fccf | 185 | |
d48b2968 JB |
186 | sdata1 = rcu_dereference(local->scan_sdata); |
187 | sdata2 = rcu_dereference(local->sched_scan_sdata); | |
98c8fccf | 188 | |
d48b2968 JB |
189 | if (likely(!sdata1 && !sdata2)) |
190 | return; | |
98c8fccf | 191 | |
d48b2968 | 192 | if (ieee80211_is_probe_resp(mgmt->frame_control)) { |
98c8fccf | 193 | /* ignore ProbeResp to foreign address */ |
d48b2968 JB |
194 | if ((!sdata1 || !ether_addr_equal(mgmt->da, sdata1->vif.addr)) && |
195 | (!sdata2 || !ether_addr_equal(mgmt->da, sdata2->vif.addr))) | |
196 | return; | |
98c8fccf | 197 | |
98c8fccf JB |
198 | elements = mgmt->u.probe_resp.variable; |
199 | baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable); | |
d48b2968 | 200 | beacon = false; |
98c8fccf | 201 | } else { |
98c8fccf JB |
202 | baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); |
203 | elements = mgmt->u.beacon.variable; | |
d48b2968 | 204 | beacon = true; |
98c8fccf JB |
205 | } |
206 | ||
98c8fccf | 207 | if (baselen > skb->len) |
d48b2968 | 208 | return; |
98c8fccf JB |
209 | |
210 | ieee802_11_parse_elems(elements, skb->len - baselen, &elems); | |
211 | ||
212 | if (elems.ds_params && elems.ds_params_len == 1) | |
59eb21a6 BR |
213 | freq = ieee80211_channel_to_frequency(elems.ds_params[0], |
214 | rx_status->band); | |
98c8fccf JB |
215 | else |
216 | freq = rx_status->freq; | |
217 | ||
d48b2968 | 218 | channel = ieee80211_get_channel(local->hw.wiphy, freq); |
98c8fccf JB |
219 | |
220 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
d48b2968 | 221 | return; |
98c8fccf | 222 | |
d48b2968 | 223 | bss = ieee80211_bss_info_update(local, rx_status, |
98c8fccf | 224 | mgmt, skb->len, &elems, |
2a519311 | 225 | channel, beacon); |
d048e503 | 226 | if (bss) |
d48b2968 | 227 | ieee80211_rx_bss_put(local, bss); |
98c8fccf JB |
228 | } |
229 | ||
4d36ec58 JB |
230 | /* return false if no more work */ |
231 | static bool ieee80211_prep_hw_scan(struct ieee80211_local *local) | |
232 | { | |
233 | struct cfg80211_scan_request *req = local->scan_req; | |
234 | enum ieee80211_band band; | |
235 | int i, ielen, n_chans; | |
236 | ||
237 | do { | |
238 | if (local->hw_scan_band == IEEE80211_NUM_BANDS) | |
239 | return false; | |
240 | ||
241 | band = local->hw_scan_band; | |
242 | n_chans = 0; | |
243 | for (i = 0; i < req->n_channels; i++) { | |
244 | if (req->channels[i]->band == band) { | |
245 | local->hw_scan_req->channels[n_chans] = | |
246 | req->channels[i]; | |
247 | n_chans++; | |
248 | } | |
249 | } | |
250 | ||
251 | local->hw_scan_band++; | |
252 | } while (!n_chans); | |
253 | ||
254 | local->hw_scan_req->n_channels = n_chans; | |
255 | ||
256 | ielen = ieee80211_build_preq_ies(local, (u8 *)local->hw_scan_req->ie, | |
8ee31080 | 257 | req->ie, req->ie_len, band, |
85a237fe | 258 | req->rates[band], 0); |
4d36ec58 | 259 | local->hw_scan_req->ie_len = ielen; |
dcd83976 | 260 | local->hw_scan_req->no_cck = req->no_cck; |
4d36ec58 JB |
261 | |
262 | return true; | |
263 | } | |
264 | ||
d07bfd8b | 265 | static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted, |
e229f844 | 266 | bool was_hw_scan) |
0a51b27e JB |
267 | { |
268 | struct ieee80211_local *local = hw_to_local(hw); | |
0a51b27e | 269 | |
e229f844 | 270 | lockdep_assert_held(&local->mtx); |
5bc75728 | 271 | |
6d3560d4 JB |
272 | /* |
273 | * It's ok to abort a not-yet-running scan (that | |
274 | * we have one at all will be verified by checking | |
275 | * local->scan_req next), but not to complete it | |
276 | * successfully. | |
277 | */ | |
278 | if (WARN_ON(!local->scanning && !aborted)) | |
279 | aborted = true; | |
5bc75728 | 280 | |
e229f844 | 281 | if (WARN_ON(!local->scan_req)) |
d07bfd8b | 282 | return; |
de95a54b | 283 | |
4d36ec58 | 284 | if (was_hw_scan && !aborted && ieee80211_prep_hw_scan(local)) { |
e2fd5dbc JB |
285 | int rc; |
286 | ||
287 | rc = drv_hw_scan(local, | |
288 | rcu_dereference_protected(local->scan_sdata, | |
289 | lockdep_is_held(&local->mtx)), | |
290 | local->hw_scan_req); | |
291 | ||
6eb11a9a | 292 | if (rc == 0) |
d07bfd8b | 293 | return; |
4d36ec58 JB |
294 | } |
295 | ||
296 | kfree(local->hw_scan_req); | |
297 | local->hw_scan_req = NULL; | |
f3b85252 | 298 | |
5ba63533 | 299 | if (local->scan_req != local->int_scan_req) |
2a519311 JB |
300 | cfg80211_scan_done(local->scan_req, aborted); |
301 | local->scan_req = NULL; | |
15db0b7f | 302 | local->scan_sdata = NULL; |
2a519311 | 303 | |
fbe9c429 | 304 | local->scanning = 0; |
58905ca5 | 305 | local->scan_channel = NULL; |
f3b85252 | 306 | |
07ef03ee JB |
307 | /* Set power back to normal operating levels. */ |
308 | ieee80211_hw_config(local, 0); | |
a0daa0e7 | 309 | |
e229f844 SG |
310 | if (!was_hw_scan) { |
311 | ieee80211_configure_filter(local); | |
312 | drv_sw_scan_complete(local); | |
e76aadc5 | 313 | ieee80211_offchannel_return(local, true); |
e229f844 | 314 | } |
0a51b27e | 315 | |
5cff20e6 | 316 | ieee80211_recalc_idle(local); |
e229f844 | 317 | |
0a51b27e | 318 | ieee80211_mlme_notify_scan_completed(local); |
46900298 | 319 | ieee80211_ibss_notify_scan_completed(local); |
472dbc45 | 320 | ieee80211_mesh_notify_scan_completed(local); |
2eb278e0 | 321 | ieee80211_start_next_roc(local); |
0a51b27e | 322 | } |
8789d459 JB |
323 | |
324 | void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) | |
325 | { | |
326 | struct ieee80211_local *local = hw_to_local(hw); | |
327 | ||
328 | trace_api_scan_completed(local, aborted); | |
329 | ||
330 | set_bit(SCAN_COMPLETED, &local->scanning); | |
331 | if (aborted) | |
332 | set_bit(SCAN_ABORTED, &local->scanning); | |
333 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0); | |
334 | } | |
0a51b27e JB |
335 | EXPORT_SYMBOL(ieee80211_scan_completed); |
336 | ||
f3b85252 JB |
337 | static int ieee80211_start_sw_scan(struct ieee80211_local *local) |
338 | { | |
f3b85252 JB |
339 | /* |
340 | * Hardware/driver doesn't support hw_scan, so use software | |
341 | * scanning instead. First send a nullfunc frame with power save | |
342 | * bit on so that AP will buffer the frames for us while we are not | |
343 | * listening, then send probe requests to each channel and wait for | |
344 | * the responses. After all channels are scanned, tune back to the | |
345 | * original channel and send a nullfunc frame with power save bit | |
346 | * off to trigger the AP to send us all the buffered frames. | |
347 | * | |
348 | * Note that while local->sw_scanning is true everything else but | |
349 | * nullfunc frames and probe requests will be dropped in | |
350 | * ieee80211_tx_h_check_assoc(). | |
351 | */ | |
24487981 | 352 | drv_sw_scan_start(local); |
f3b85252 | 353 | |
de312db3 | 354 | local->leave_oper_channel_time = jiffies; |
977923b0 | 355 | local->next_scan_state = SCAN_DECISION; |
f3b85252 JB |
356 | local->scan_channel_idx = 0; |
357 | ||
07ef03ee | 358 | ieee80211_offchannel_stop_vifs(local, true); |
a80f7c0b | 359 | |
3ac64bee | 360 | ieee80211_configure_filter(local); |
f3b85252 | 361 | |
59bdf3b0 BG |
362 | /* We need to set power level at maximum rate for scanning. */ |
363 | ieee80211_hw_config(local, 0); | |
364 | ||
42935eca | 365 | ieee80211_queue_delayed_work(&local->hw, |
07ef03ee | 366 | &local->scan_work, 0); |
f3b85252 JB |
367 | |
368 | return 0; | |
369 | } | |
370 | ||
133d40f9 SG |
371 | static bool ieee80211_can_scan(struct ieee80211_local *local, |
372 | struct ieee80211_sub_if_data *sdata) | |
373 | { | |
2eb278e0 | 374 | if (!list_empty(&local->roc_list)) |
133d40f9 SG |
375 | return false; |
376 | ||
377 | if (sdata->vif.type == NL80211_IFTYPE_STATION && | |
378 | sdata->u.mgd.flags & (IEEE80211_STA_BEACON_POLL | | |
379 | IEEE80211_STA_CONNECTION_POLL)) | |
380 | return false; | |
381 | ||
382 | return true; | |
383 | } | |
384 | ||
385 | void ieee80211_run_deferred_scan(struct ieee80211_local *local) | |
386 | { | |
387 | lockdep_assert_held(&local->mtx); | |
388 | ||
389 | if (!local->scan_req || local->scanning) | |
390 | return; | |
391 | ||
e2fd5dbc JB |
392 | if (!ieee80211_can_scan(local, |
393 | rcu_dereference_protected( | |
394 | local->scan_sdata, | |
395 | lockdep_is_held(&local->mtx)))) | |
133d40f9 SG |
396 | return; |
397 | ||
398 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, | |
399 | round_jiffies_relative(0)); | |
400 | } | |
f3b85252 | 401 | |
8a690674 BG |
402 | static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, |
403 | unsigned long *next_delay) | |
404 | { | |
405 | int i; | |
e2fd5dbc | 406 | struct ieee80211_sub_if_data *sdata; |
8a690674 BG |
407 | enum ieee80211_band band = local->hw.conf.channel->band; |
408 | ||
e2fd5dbc JB |
409 | sdata = rcu_dereference_protected(local->scan_sdata, |
410 | lockdep_is_held(&local->mtx));; | |
411 | ||
8a690674 BG |
412 | for (i = 0; i < local->scan_req->n_ssids; i++) |
413 | ieee80211_send_probe_req( | |
414 | sdata, NULL, | |
415 | local->scan_req->ssids[i].ssid, | |
416 | local->scan_req->ssids[i].ssid_len, | |
417 | local->scan_req->ie, local->scan_req->ie_len, | |
418 | local->scan_req->rates[band], false, | |
419 | local->scan_req->no_cck); | |
420 | ||
421 | /* | |
422 | * After sending probe requests, wait for probe responses | |
423 | * on the channel. | |
424 | */ | |
425 | *next_delay = IEEE80211_CHANNEL_TIME; | |
426 | local->next_scan_state = SCAN_DECISION; | |
427 | } | |
428 | ||
f3b85252 JB |
429 | static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, |
430 | struct cfg80211_scan_request *req) | |
431 | { | |
432 | struct ieee80211_local *local = sdata->local; | |
f3b85252 JB |
433 | int rc; |
434 | ||
e229f844 SG |
435 | lockdep_assert_held(&local->mtx); |
436 | ||
f3b85252 JB |
437 | if (local->scan_req) |
438 | return -EBUSY; | |
439 | ||
133d40f9 | 440 | if (!ieee80211_can_scan(local, sdata)) { |
6e7e6213 | 441 | /* wait for the work to finish/time out */ |
c0ce77b8 | 442 | local->scan_req = req; |
e2fd5dbc | 443 | rcu_assign_pointer(local->scan_sdata, sdata); |
c0ce77b8 JB |
444 | return 0; |
445 | } | |
446 | ||
f3b85252 JB |
447 | if (local->ops->hw_scan) { |
448 | u8 *ies; | |
f3b85252 | 449 | |
4d36ec58 JB |
450 | local->hw_scan_req = kmalloc( |
451 | sizeof(*local->hw_scan_req) + | |
452 | req->n_channels * sizeof(req->channels[0]) + | |
453 | 2 + IEEE80211_MAX_SSID_LEN + local->scan_ies_len + | |
454 | req->ie_len, GFP_KERNEL); | |
455 | if (!local->hw_scan_req) | |
f3b85252 JB |
456 | return -ENOMEM; |
457 | ||
4d36ec58 JB |
458 | local->hw_scan_req->ssids = req->ssids; |
459 | local->hw_scan_req->n_ssids = req->n_ssids; | |
460 | ies = (u8 *)local->hw_scan_req + | |
461 | sizeof(*local->hw_scan_req) + | |
462 | req->n_channels * sizeof(req->channels[0]); | |
463 | local->hw_scan_req->ie = ies; | |
464 | ||
465 | local->hw_scan_band = 0; | |
6e7e6213 JL |
466 | |
467 | /* | |
468 | * After allocating local->hw_scan_req, we must | |
469 | * go through until ieee80211_prep_hw_scan(), so | |
470 | * anything that might be changed here and leave | |
471 | * this function early must not go after this | |
472 | * allocation. | |
473 | */ | |
f3b85252 JB |
474 | } |
475 | ||
476 | local->scan_req = req; | |
e2fd5dbc | 477 | rcu_assign_pointer(local->scan_sdata, sdata); |
f3b85252 | 478 | |
8a690674 | 479 | if (local->ops->hw_scan) { |
fbe9c429 | 480 | __set_bit(SCAN_HW_SCANNING, &local->scanning); |
8a690674 BG |
481 | } else if ((req->n_channels == 1) && |
482 | (req->channels[0]->center_freq == | |
483 | local->hw.conf.channel->center_freq)) { | |
484 | ||
485 | /* If we are scanning only on the current channel, then | |
486 | * we do not need to stop normal activities | |
487 | */ | |
488 | unsigned long next_delay; | |
489 | ||
490 | __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); | |
491 | ||
492 | ieee80211_recalc_idle(local); | |
493 | ||
494 | /* Notify driver scan is starting, keep order of operations | |
495 | * same as normal software scan, in case that matters. */ | |
496 | drv_sw_scan_start(local); | |
497 | ||
498 | ieee80211_configure_filter(local); /* accept probe-responses */ | |
499 | ||
500 | /* We need to ensure power level is at max for scanning. */ | |
501 | ieee80211_hw_config(local, 0); | |
502 | ||
503 | if ((req->channels[0]->flags & | |
504 | IEEE80211_CHAN_PASSIVE_SCAN) || | |
505 | !local->scan_req->n_ssids) { | |
506 | next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; | |
507 | } else { | |
508 | ieee80211_scan_state_send_probe(local, &next_delay); | |
509 | next_delay = IEEE80211_CHANNEL_TIME; | |
510 | } | |
511 | ||
512 | /* Now, just wait a bit and we are all done! */ | |
513 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, | |
514 | next_delay); | |
515 | return 0; | |
516 | } else { | |
517 | /* Do normal software scan */ | |
fbe9c429 | 518 | __set_bit(SCAN_SW_SCANNING, &local->scanning); |
8a690674 | 519 | } |
6e7e6213 | 520 | |
5cff20e6 | 521 | ieee80211_recalc_idle(local); |
f3b85252 | 522 | |
4d36ec58 JB |
523 | if (local->ops->hw_scan) { |
524 | WARN_ON(!ieee80211_prep_hw_scan(local)); | |
a060bbfe | 525 | rc = drv_hw_scan(local, sdata, local->hw_scan_req); |
4d36ec58 | 526 | } else |
f3b85252 JB |
527 | rc = ieee80211_start_sw_scan(local); |
528 | ||
f3b85252 | 529 | if (rc) { |
4d36ec58 JB |
530 | kfree(local->hw_scan_req); |
531 | local->hw_scan_req = NULL; | |
fbe9c429 | 532 | local->scanning = 0; |
f3b85252 | 533 | |
5cff20e6 JB |
534 | ieee80211_recalc_idle(local); |
535 | ||
f3b85252 | 536 | local->scan_req = NULL; |
e2fd5dbc | 537 | rcu_assign_pointer(local->scan_sdata, NULL); |
f3b85252 JB |
538 | } |
539 | ||
540 | return rc; | |
541 | } | |
542 | ||
df13cce5 HS |
543 | static unsigned long |
544 | ieee80211_scan_get_channel_time(struct ieee80211_channel *chan) | |
545 | { | |
546 | /* | |
547 | * TODO: channel switching also consumes quite some time, | |
548 | * add that delay as well to get a better estimation | |
549 | */ | |
550 | if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) | |
551 | return IEEE80211_PASSIVE_CHANNEL_TIME; | |
552 | return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; | |
553 | } | |
554 | ||
e229f844 SG |
555 | static void ieee80211_scan_state_decision(struct ieee80211_local *local, |
556 | unsigned long *next_delay) | |
7d3be3cc | 557 | { |
142b9f50 | 558 | bool associated = false; |
df13cce5 HS |
559 | bool tx_empty = true; |
560 | bool bad_latency; | |
561 | bool listen_int_exceeded; | |
562 | unsigned long min_beacon_int = 0; | |
142b9f50 | 563 | struct ieee80211_sub_if_data *sdata; |
df13cce5 | 564 | struct ieee80211_channel *next_chan; |
142b9f50 | 565 | |
df13cce5 HS |
566 | /* |
567 | * check if at least one STA interface is associated, | |
568 | * check if at least one STA interface has pending tx frames | |
569 | * and grab the lowest used beacon interval | |
570 | */ | |
142b9f50 HS |
571 | mutex_lock(&local->iflist_mtx); |
572 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 573 | if (!ieee80211_sdata_running(sdata)) |
142b9f50 HS |
574 | continue; |
575 | ||
576 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { | |
577 | if (sdata->u.mgd.associated) { | |
578 | associated = true; | |
df13cce5 HS |
579 | |
580 | if (sdata->vif.bss_conf.beacon_int < | |
581 | min_beacon_int || min_beacon_int == 0) | |
582 | min_beacon_int = | |
583 | sdata->vif.bss_conf.beacon_int; | |
584 | ||
585 | if (!qdisc_all_tx_empty(sdata->dev)) { | |
586 | tx_empty = false; | |
587 | break; | |
588 | } | |
142b9f50 HS |
589 | } |
590 | } | |
591 | } | |
592 | mutex_unlock(&local->iflist_mtx); | |
593 | ||
b23b025f BG |
594 | next_chan = local->scan_req->channels[local->scan_channel_idx]; |
595 | ||
a80f7c0b | 596 | /* |
07ef03ee JB |
597 | * we're currently scanning a different channel, let's |
598 | * see if we can scan another channel without interfering | |
599 | * with the current traffic situation. | |
600 | * | |
601 | * Since we don't know if the AP has pending frames for us | |
602 | * we can only check for our tx queues and use the current | |
603 | * pm_qos requirements for rx. Hence, if no tx traffic occurs | |
604 | * at all we will scan as many channels in a row as the pm_qos | |
605 | * latency allows us to. Additionally we also check for the | |
606 | * currently negotiated listen interval to prevent losing | |
607 | * frames unnecessarily. | |
608 | * | |
609 | * Otherwise switch back to the operating channel. | |
a80f7c0b | 610 | */ |
a80f7c0b | 611 | |
07ef03ee JB |
612 | bad_latency = time_after(jiffies + |
613 | ieee80211_scan_get_channel_time(next_chan), | |
614 | local->leave_oper_channel_time + | |
615 | usecs_to_jiffies(pm_qos_request(PM_QOS_NETWORK_LATENCY))); | |
df13cce5 | 616 | |
07ef03ee JB |
617 | listen_int_exceeded = time_after(jiffies + |
618 | ieee80211_scan_get_channel_time(next_chan), | |
619 | local->leave_oper_channel_time + | |
620 | usecs_to_jiffies(min_beacon_int * 1024) * | |
621 | local->hw.conf.listen_interval); | |
142b9f50 | 622 | |
07ef03ee JB |
623 | if (associated && (!tx_empty || bad_latency || listen_int_exceeded)) |
624 | local->next_scan_state = SCAN_SUSPEND; | |
625 | else | |
626 | local->next_scan_state = SCAN_SET_CHANNEL; | |
142b9f50 | 627 | |
07ef03ee | 628 | *next_delay = 0; |
142b9f50 HS |
629 | } |
630 | ||
2fb3f028 HS |
631 | static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, |
632 | unsigned long *next_delay) | |
633 | { | |
634 | int skip; | |
635 | struct ieee80211_channel *chan; | |
2fb3f028 | 636 | |
7d3be3cc HS |
637 | skip = 0; |
638 | chan = local->scan_req->channels[local->scan_channel_idx]; | |
639 | ||
584991dc | 640 | local->scan_channel = chan; |
b23b025f | 641 | |
07ef03ee JB |
642 | if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) |
643 | skip = 1; | |
7d3be3cc | 644 | |
7d3be3cc HS |
645 | /* advance state machine to next channel/band */ |
646 | local->scan_channel_idx++; | |
647 | ||
0ee9c13c HS |
648 | if (skip) { |
649 | /* if we skip this channel return to the decision state */ | |
650 | local->next_scan_state = SCAN_DECISION; | |
2fb3f028 | 651 | return; |
0ee9c13c | 652 | } |
7d3be3cc HS |
653 | |
654 | /* | |
655 | * Probe delay is used to update the NAV, cf. 11.1.3.2.2 | |
656 | * (which unfortunately doesn't say _why_ step a) is done, | |
657 | * but it waits for the probe delay or until a frame is | |
658 | * received - and the received frame would update the NAV). | |
659 | * For now, we do not support waiting until a frame is | |
660 | * received. | |
661 | * | |
662 | * In any case, it is not necessary for a passive scan. | |
663 | */ | |
664 | if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN || | |
665 | !local->scan_req->n_ssids) { | |
666 | *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; | |
977923b0 | 667 | local->next_scan_state = SCAN_DECISION; |
2fb3f028 | 668 | return; |
7d3be3cc HS |
669 | } |
670 | ||
2fb3f028 | 671 | /* active scan, send probes */ |
7d3be3cc | 672 | *next_delay = IEEE80211_PROBE_DELAY; |
977923b0 | 673 | local->next_scan_state = SCAN_SEND_PROBE; |
7d3be3cc HS |
674 | } |
675 | ||
07ef03ee JB |
676 | static void ieee80211_scan_state_suspend(struct ieee80211_local *local, |
677 | unsigned long *next_delay) | |
678 | { | |
679 | /* switch back to the operating channel */ | |
680 | local->scan_channel = NULL; | |
681 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); | |
682 | ||
683 | /* | |
684 | * Re-enable vifs and beaconing. Leave PS | |
685 | * in off-channel state..will put that back | |
686 | * on-channel at the end of scanning. | |
687 | */ | |
e76aadc5 | 688 | ieee80211_offchannel_return(local, false); |
07ef03ee JB |
689 | |
690 | *next_delay = HZ / 5; | |
691 | /* afterwards, resume scan & go to next channel */ | |
692 | local->next_scan_state = SCAN_RESUME; | |
693 | } | |
694 | ||
695 | static void ieee80211_scan_state_resume(struct ieee80211_local *local, | |
696 | unsigned long *next_delay) | |
697 | { | |
698 | /* PS already is in off-channel mode */ | |
699 | ieee80211_offchannel_stop_vifs(local, false); | |
700 | ||
701 | if (local->ops->flush) { | |
702 | drv_flush(local, false); | |
703 | *next_delay = 0; | |
704 | } else | |
705 | *next_delay = HZ / 10; | |
706 | ||
707 | /* remember when we left the operating channel */ | |
708 | local->leave_oper_channel_time = jiffies; | |
709 | ||
710 | /* advance to the next channel to be scanned */ | |
de2ee84d | 711 | local->next_scan_state = SCAN_SET_CHANNEL; |
07ef03ee JB |
712 | } |
713 | ||
c2b13452 | 714 | void ieee80211_scan_work(struct work_struct *work) |
0a51b27e JB |
715 | { |
716 | struct ieee80211_local *local = | |
717 | container_of(work, struct ieee80211_local, scan_work.work); | |
d07bfd8b | 718 | struct ieee80211_sub_if_data *sdata; |
0a51b27e | 719 | unsigned long next_delay = 0; |
d07bfd8b | 720 | bool aborted, hw_scan; |
0a51b27e | 721 | |
259b62e3 | 722 | mutex_lock(&local->mtx); |
8789d459 | 723 | |
e2fd5dbc JB |
724 | sdata = rcu_dereference_protected(local->scan_sdata, |
725 | lockdep_is_held(&local->mtx)); | |
d07bfd8b | 726 | |
8a690674 BG |
727 | /* When scanning on-channel, the first-callback means completed. */ |
728 | if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) { | |
729 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); | |
730 | goto out_complete; | |
731 | } | |
732 | ||
259b62e3 | 733 | if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) { |
8789d459 | 734 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); |
259b62e3 | 735 | goto out_complete; |
8789d459 JB |
736 | } |
737 | ||
259b62e3 SG |
738 | if (!sdata || !local->scan_req) |
739 | goto out; | |
f3b85252 | 740 | |
fbe9c429 | 741 | if (local->scan_req && !local->scanning) { |
f3b85252 JB |
742 | struct cfg80211_scan_request *req = local->scan_req; |
743 | int rc; | |
744 | ||
745 | local->scan_req = NULL; | |
e2fd5dbc | 746 | rcu_assign_pointer(local->scan_sdata, NULL); |
f3b85252 JB |
747 | |
748 | rc = __ieee80211_start_scan(sdata, req); | |
259b62e3 | 749 | if (rc) { |
3aed49ef SG |
750 | /* need to complete scan in cfg80211 */ |
751 | local->scan_req = req; | |
259b62e3 SG |
752 | aborted = true; |
753 | goto out_complete; | |
754 | } else | |
755 | goto out; | |
f3b85252 JB |
756 | } |
757 | ||
5bc75728 JB |
758 | /* |
759 | * Avoid re-scheduling when the sdata is going away. | |
760 | */ | |
9607e6b6 | 761 | if (!ieee80211_sdata_running(sdata)) { |
259b62e3 SG |
762 | aborted = true; |
763 | goto out_complete; | |
f3b85252 | 764 | } |
0a51b27e | 765 | |
f502d09b HS |
766 | /* |
767 | * as long as no delay is required advance immediately | |
768 | * without scheduling a new work | |
769 | */ | |
770 | do { | |
c29acf20 RM |
771 | if (!ieee80211_sdata_running(sdata)) { |
772 | aborted = true; | |
773 | goto out_complete; | |
774 | } | |
775 | ||
977923b0 | 776 | switch (local->next_scan_state) { |
2fb3f028 | 777 | case SCAN_DECISION: |
e229f844 SG |
778 | /* if no more bands/channels left, complete scan */ |
779 | if (local->scan_channel_idx >= local->scan_req->n_channels) { | |
780 | aborted = false; | |
781 | goto out_complete; | |
782 | } | |
783 | ieee80211_scan_state_decision(local, &next_delay); | |
f502d09b | 784 | break; |
2fb3f028 HS |
785 | case SCAN_SET_CHANNEL: |
786 | ieee80211_scan_state_set_channel(local, &next_delay); | |
787 | break; | |
f502d09b HS |
788 | case SCAN_SEND_PROBE: |
789 | ieee80211_scan_state_send_probe(local, &next_delay); | |
790 | break; | |
07ef03ee JB |
791 | case SCAN_SUSPEND: |
792 | ieee80211_scan_state_suspend(local, &next_delay); | |
142b9f50 | 793 | break; |
07ef03ee JB |
794 | case SCAN_RESUME: |
795 | ieee80211_scan_state_resume(local, &next_delay); | |
142b9f50 | 796 | break; |
f502d09b HS |
797 | } |
798 | } while (next_delay == 0); | |
0a51b27e | 799 | |
42935eca | 800 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay); |
d07bfd8b | 801 | goto out; |
259b62e3 SG |
802 | |
803 | out_complete: | |
e229f844 | 804 | hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning); |
d07bfd8b | 805 | __ieee80211_scan_completed(&local->hw, aborted, hw_scan); |
259b62e3 SG |
806 | out: |
807 | mutex_unlock(&local->mtx); | |
0a51b27e JB |
808 | } |
809 | ||
f3b85252 JB |
810 | int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, |
811 | struct cfg80211_scan_request *req) | |
0a51b27e | 812 | { |
f3b85252 | 813 | int res; |
de95a54b | 814 | |
a1699b75 | 815 | mutex_lock(&sdata->local->mtx); |
f3b85252 | 816 | res = __ieee80211_start_scan(sdata, req); |
a1699b75 | 817 | mutex_unlock(&sdata->local->mtx); |
0a51b27e | 818 | |
f3b85252 | 819 | return res; |
0a51b27e JB |
820 | } |
821 | ||
f3b85252 | 822 | int ieee80211_request_internal_scan(struct ieee80211_sub_if_data *sdata, |
be4a4b6a JB |
823 | const u8 *ssid, u8 ssid_len, |
824 | struct ieee80211_channel *chan) | |
0a51b27e | 825 | { |
0a51b27e | 826 | struct ieee80211_local *local = sdata->local; |
f3b85252 | 827 | int ret = -EBUSY; |
fb63bc41 | 828 | enum ieee80211_band band; |
2a519311 | 829 | |
a1699b75 | 830 | mutex_lock(&local->mtx); |
0a51b27e | 831 | |
f3b85252 JB |
832 | /* busy scanning */ |
833 | if (local->scan_req) | |
834 | goto unlock; | |
9116dd01 | 835 | |
be4a4b6a JB |
836 | /* fill internal scan request */ |
837 | if (!chan) { | |
838 | int i, nchan = 0; | |
839 | ||
840 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
841 | if (!local->hw.wiphy->bands[band]) | |
842 | continue; | |
843 | for (i = 0; | |
844 | i < local->hw.wiphy->bands[band]->n_channels; | |
845 | i++) { | |
846 | local->int_scan_req->channels[nchan] = | |
847 | &local->hw.wiphy->bands[band]->channels[i]; | |
848 | nchan++; | |
849 | } | |
850 | } | |
851 | ||
852 | local->int_scan_req->n_channels = nchan; | |
853 | } else { | |
854 | local->int_scan_req->channels[0] = chan; | |
855 | local->int_scan_req->n_channels = 1; | |
856 | } | |
857 | ||
858 | local->int_scan_req->ssids = &local->scan_ssid; | |
859 | local->int_scan_req->n_ssids = 1; | |
5ba63533 JB |
860 | memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); |
861 | local->int_scan_req->ssids[0].ssid_len = ssid_len; | |
9116dd01 | 862 | |
5ba63533 | 863 | ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); |
f3b85252 | 864 | unlock: |
a1699b75 | 865 | mutex_unlock(&local->mtx); |
f3b85252 | 866 | return ret; |
0a51b27e | 867 | } |
5bb644a0 | 868 | |
4136c422 SG |
869 | /* |
870 | * Only call this function when a scan can't be queued -- under RTNL. | |
871 | */ | |
5bb644a0 JB |
872 | void ieee80211_scan_cancel(struct ieee80211_local *local) |
873 | { | |
5bb644a0 | 874 | /* |
b856439b | 875 | * We are canceling software scan, or deferred scan that was not |
4136c422 SG |
876 | * yet really started (see __ieee80211_start_scan ). |
877 | * | |
878 | * Regarding hardware scan: | |
879 | * - we can not call __ieee80211_scan_completed() as when | |
880 | * SCAN_HW_SCANNING bit is set this function change | |
881 | * local->hw_scan_req to operate on 5G band, what race with | |
882 | * driver which can use local->hw_scan_req | |
883 | * | |
884 | * - we can not cancel scan_work since driver can schedule it | |
885 | * by ieee80211_scan_completed(..., true) to finish scan | |
886 | * | |
b856439b EP |
887 | * Hence we only call the cancel_hw_scan() callback, but the low-level |
888 | * driver is still responsible for calling ieee80211_scan_completed() | |
889 | * after the scan was completed/aborted. | |
5bb644a0 | 890 | */ |
4136c422 | 891 | |
a1699b75 | 892 | mutex_lock(&local->mtx); |
b856439b EP |
893 | if (!local->scan_req) |
894 | goto out; | |
895 | ||
896 | if (test_bit(SCAN_HW_SCANNING, &local->scanning)) { | |
897 | if (local->ops->cancel_hw_scan) | |
e2fd5dbc JB |
898 | drv_cancel_hw_scan(local, |
899 | rcu_dereference_protected(local->scan_sdata, | |
900 | lockdep_is_held(&local->mtx))); | |
b856439b | 901 | goto out; |
4136c422 | 902 | } |
b856439b EP |
903 | |
904 | /* | |
905 | * If the work is currently running, it must be blocked on | |
906 | * the mutex, but we'll set scan_sdata = NULL and it'll | |
907 | * simply exit once it acquires the mutex. | |
908 | */ | |
909 | cancel_delayed_work(&local->scan_work); | |
910 | /* and clean up */ | |
911 | __ieee80211_scan_completed(&local->hw, true, false); | |
912 | out: | |
d07bfd8b | 913 | mutex_unlock(&local->mtx); |
5bb644a0 | 914 | } |
79f460ca LC |
915 | |
916 | int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, | |
917 | struct cfg80211_sched_scan_request *req) | |
918 | { | |
919 | struct ieee80211_local *local = sdata->local; | |
920 | int ret, i; | |
921 | ||
5260a5b2 | 922 | mutex_lock(&local->mtx); |
79f460ca | 923 | |
5260a5b2 | 924 | if (rcu_access_pointer(local->sched_scan_sdata)) { |
79f460ca LC |
925 | ret = -EBUSY; |
926 | goto out; | |
927 | } | |
928 | ||
929 | if (!local->ops->sched_scan_start) { | |
930 | ret = -ENOTSUPP; | |
931 | goto out; | |
932 | } | |
933 | ||
934 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) { | |
d811b3d5 AN |
935 | if (!local->hw.wiphy->bands[i]) |
936 | continue; | |
937 | ||
79f460ca LC |
938 | local->sched_scan_ies.ie[i] = kzalloc(2 + |
939 | IEEE80211_MAX_SSID_LEN + | |
1186980d LC |
940 | local->scan_ies_len + |
941 | req->ie_len, | |
79f460ca LC |
942 | GFP_KERNEL); |
943 | if (!local->sched_scan_ies.ie[i]) { | |
944 | ret = -ENOMEM; | |
945 | goto out_free; | |
946 | } | |
947 | ||
948 | local->sched_scan_ies.len[i] = | |
949 | ieee80211_build_preq_ies(local, | |
950 | local->sched_scan_ies.ie[i], | |
951 | req->ie, req->ie_len, i, | |
952 | (u32) -1, 0); | |
953 | } | |
954 | ||
955 | ret = drv_sched_scan_start(local, sdata, req, | |
956 | &local->sched_scan_ies); | |
957 | if (ret == 0) { | |
5260a5b2 | 958 | rcu_assign_pointer(local->sched_scan_sdata, sdata); |
79f460ca LC |
959 | goto out; |
960 | } | |
961 | ||
962 | out_free: | |
963 | while (i > 0) | |
964 | kfree(local->sched_scan_ies.ie[--i]); | |
965 | out: | |
5260a5b2 | 966 | mutex_unlock(&local->mtx); |
79f460ca LC |
967 | return ret; |
968 | } | |
969 | ||
85a9994a | 970 | int ieee80211_request_sched_scan_stop(struct ieee80211_sub_if_data *sdata) |
79f460ca LC |
971 | { |
972 | struct ieee80211_local *local = sdata->local; | |
973 | int ret = 0, i; | |
974 | ||
5260a5b2 | 975 | mutex_lock(&local->mtx); |
79f460ca LC |
976 | |
977 | if (!local->ops->sched_scan_stop) { | |
978 | ret = -ENOTSUPP; | |
979 | goto out; | |
980 | } | |
981 | ||
5260a5b2 | 982 | if (rcu_access_pointer(local->sched_scan_sdata)) { |
79f460ca LC |
983 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) |
984 | kfree(local->sched_scan_ies.ie[i]); | |
985 | ||
85a9994a | 986 | drv_sched_scan_stop(local, sdata); |
5260a5b2 | 987 | rcu_assign_pointer(local->sched_scan_sdata, NULL); |
79f460ca | 988 | } |
79f460ca | 989 | out: |
5260a5b2 | 990 | mutex_unlock(&local->mtx); |
79f460ca LC |
991 | |
992 | return ret; | |
993 | } | |
994 | ||
995 | void ieee80211_sched_scan_results(struct ieee80211_hw *hw) | |
996 | { | |
997 | struct ieee80211_local *local = hw_to_local(hw); | |
998 | ||
999 | trace_api_sched_scan_results(local); | |
1000 | ||
1001 | cfg80211_sched_scan_results(hw->wiphy); | |
1002 | } | |
1003 | EXPORT_SYMBOL(ieee80211_sched_scan_results); | |
1004 | ||
85a9994a LC |
1005 | void ieee80211_sched_scan_stopped_work(struct work_struct *work) |
1006 | { | |
1007 | struct ieee80211_local *local = | |
1008 | container_of(work, struct ieee80211_local, | |
1009 | sched_scan_stopped_work); | |
1010 | int i; | |
1011 | ||
1012 | mutex_lock(&local->mtx); | |
1013 | ||
5260a5b2 | 1014 | if (!rcu_access_pointer(local->sched_scan_sdata)) { |
85a9994a LC |
1015 | mutex_unlock(&local->mtx); |
1016 | return; | |
1017 | } | |
1018 | ||
1019 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) | |
1020 | kfree(local->sched_scan_ies.ie[i]); | |
1021 | ||
5260a5b2 | 1022 | rcu_assign_pointer(local->sched_scan_sdata, NULL); |
85a9994a LC |
1023 | |
1024 | mutex_unlock(&local->mtx); | |
1025 | ||
1026 | cfg80211_sched_scan_stopped(local->hw.wiphy); | |
1027 | } | |
1028 | ||
79f460ca LC |
1029 | void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw) |
1030 | { | |
1031 | struct ieee80211_local *local = hw_to_local(hw); | |
1032 | ||
1033 | trace_api_sched_scan_stopped(local); | |
1034 | ||
85a9994a | 1035 | ieee80211_queue_work(&local->hw, &local->sched_scan_stopped_work); |
79f460ca LC |
1036 | } |
1037 | EXPORT_SYMBOL(ieee80211_sched_scan_stopped); |