Commit | Line | Data |
---|---|---|
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) | |
3f892b61 | 30 | #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 9) |
0a51b27e | 31 | |
5484e237 | 32 | void ieee80211_rx_bss_put(struct ieee80211_local *local, |
c2b13452 | 33 | struct ieee80211_bss *bss) |
5484e237 | 34 | { |
0c1ad2ca JB |
35 | if (!bss) |
36 | return; | |
5b112d3d JB |
37 | cfg80211_put_bss(local->hw.wiphy, |
38 | container_of((void *)bss, struct cfg80211_bss, priv)); | |
5484e237 JB |
39 | } |
40 | ||
ab13315a KV |
41 | static bool is_uapsd_supported(struct ieee802_11_elems *elems) |
42 | { | |
43 | u8 qos_info; | |
44 | ||
45 | if (elems->wmm_info && elems->wmm_info_len == 7 | |
46 | && elems->wmm_info[5] == 1) | |
47 | qos_info = elems->wmm_info[6]; | |
48 | else if (elems->wmm_param && elems->wmm_param_len == 24 | |
49 | && elems->wmm_param[5] == 1) | |
50 | qos_info = elems->wmm_param[6]; | |
51 | else | |
52 | /* no valid wmm information or parameter element found */ | |
53 | return false; | |
54 | ||
55 | return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD; | |
56 | } | |
57 | ||
c2b13452 | 58 | struct ieee80211_bss * |
5484e237 JB |
59 | ieee80211_bss_info_update(struct ieee80211_local *local, |
60 | struct ieee80211_rx_status *rx_status, | |
d45c4172 | 61 | struct ieee80211_mgmt *mgmt, size_t len, |
5484e237 | 62 | struct ieee802_11_elems *elems, |
d45c4172 | 63 | struct ieee80211_channel *channel) |
5484e237 | 64 | { |
d45c4172 | 65 | bool beacon = ieee80211_is_beacon(mgmt->frame_control); |
0c1ad2ca | 66 | struct cfg80211_bss *cbss; |
c2b13452 | 67 | struct ieee80211_bss *bss; |
f0b058b6 | 68 | int clen, srlen; |
2a519311 JB |
69 | s32 signal = 0; |
70 | ||
77965c97 | 71 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
2a519311 | 72 | signal = rx_status->signal * 100; |
77965c97 | 73 | else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) |
2a519311 | 74 | signal = (rx_status->signal * 100) / local->hw.max_signal; |
2a519311 | 75 | |
0c1ad2ca JB |
76 | cbss = cfg80211_inform_bss_frame(local->hw.wiphy, channel, |
77 | mgmt, len, signal, GFP_ATOMIC); | |
0c1ad2ca | 78 | if (!cbss) |
00d3f14c JB |
79 | return NULL; |
80 | ||
0c1ad2ca | 81 | bss = (void *)cbss->priv; |
5484e237 | 82 | |
ef429dad JB |
83 | if (beacon) |
84 | bss->device_ts_beacon = rx_status->device_timestamp; | |
85 | else | |
86 | bss->device_ts_presp = rx_status->device_timestamp; | |
8c358bcd | 87 | |
fcff4f10 PS |
88 | if (elems->parse_error) { |
89 | if (beacon) | |
90 | bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON; | |
91 | else | |
92 | bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP; | |
93 | } else { | |
94 | if (beacon) | |
95 | bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON; | |
96 | else | |
97 | bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP; | |
98 | } | |
99 | ||
5484e237 | 100 | /* save the ERP value so that it is available at association time */ |
1946bed9 JB |
101 | if (elems->erp_info && (!elems->parse_error || |
102 | !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) { | |
5484e237 | 103 | bss->erp_value = elems->erp_info[0]; |
3db1cd5c | 104 | bss->has_erp_value = true; |
fcff4f10 PS |
105 | if (!elems->parse_error) |
106 | bss->valid_data |= IEEE80211_BSS_VALID_ERP; | |
5484e237 JB |
107 | } |
108 | ||
f0b058b6 | 109 | /* replace old supported rates if we get new values */ |
fcff4f10 PS |
110 | if (!elems->parse_error || |
111 | !(bss->valid_data & IEEE80211_BSS_VALID_RATES)) { | |
112 | srlen = 0; | |
113 | if (elems->supp_rates) { | |
114 | clen = IEEE80211_MAX_SUPP_RATES; | |
115 | if (clen > elems->supp_rates_len) | |
116 | clen = elems->supp_rates_len; | |
117 | memcpy(bss->supp_rates, elems->supp_rates, clen); | |
118 | srlen += clen; | |
119 | } | |
120 | if (elems->ext_supp_rates) { | |
121 | clen = IEEE80211_MAX_SUPP_RATES - srlen; | |
122 | if (clen > elems->ext_supp_rates_len) | |
123 | clen = elems->ext_supp_rates_len; | |
124 | memcpy(bss->supp_rates + srlen, elems->ext_supp_rates, | |
125 | clen); | |
126 | srlen += clen; | |
127 | } | |
128 | if (srlen) { | |
129 | bss->supp_rates_len = srlen; | |
130 | if (!elems->parse_error) | |
131 | bss->valid_data |= IEEE80211_BSS_VALID_RATES; | |
132 | } | |
5484e237 | 133 | } |
5484e237 | 134 | |
fcff4f10 PS |
135 | if (!elems->parse_error || |
136 | !(bss->valid_data & IEEE80211_BSS_VALID_WMM)) { | |
137 | bss->wmm_used = elems->wmm_param || elems->wmm_info; | |
138 | bss->uapsd_supported = is_uapsd_supported(elems); | |
139 | if (!elems->parse_error) | |
140 | bss->valid_data |= IEEE80211_BSS_VALID_WMM; | |
141 | } | |
5484e237 | 142 | |
817cee76 AB |
143 | if (beacon) { |
144 | struct ieee80211_supported_band *sband = | |
145 | local->hw.wiphy->bands[rx_status->band]; | |
146 | if (!(rx_status->flag & RX_FLAG_HT) && | |
147 | !(rx_status->flag & RX_FLAG_VHT)) | |
148 | bss->beacon_rate = | |
149 | &sband->bitrates[rx_status->rate_idx]; | |
150 | } | |
151 | ||
5484e237 JB |
152 | return bss; |
153 | } | |
0a51b27e | 154 | |
d48b2968 | 155 | void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb) |
98c8fccf | 156 | { |
f1d58c25 | 157 | struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); |
d48b2968 JB |
158 | struct ieee80211_sub_if_data *sdata1, *sdata2; |
159 | struct ieee80211_mgmt *mgmt = (void *)skb->data; | |
c2b13452 | 160 | struct ieee80211_bss *bss; |
98c8fccf JB |
161 | u8 *elements; |
162 | struct ieee80211_channel *channel; | |
163 | size_t baselen; | |
98c8fccf JB |
164 | struct ieee802_11_elems elems; |
165 | ||
d48b2968 JB |
166 | if (skb->len < 24 || |
167 | (!ieee80211_is_probe_resp(mgmt->frame_control) && | |
168 | !ieee80211_is_beacon(mgmt->frame_control))) | |
169 | return; | |
98c8fccf | 170 | |
d48b2968 JB |
171 | sdata1 = rcu_dereference(local->scan_sdata); |
172 | sdata2 = rcu_dereference(local->sched_scan_sdata); | |
98c8fccf | 173 | |
d48b2968 JB |
174 | if (likely(!sdata1 && !sdata2)) |
175 | return; | |
98c8fccf | 176 | |
d48b2968 | 177 | if (ieee80211_is_probe_resp(mgmt->frame_control)) { |
98c8fccf | 178 | /* ignore ProbeResp to foreign address */ |
d48b2968 JB |
179 | if ((!sdata1 || !ether_addr_equal(mgmt->da, sdata1->vif.addr)) && |
180 | (!sdata2 || !ether_addr_equal(mgmt->da, sdata2->vif.addr))) | |
181 | return; | |
98c8fccf | 182 | |
98c8fccf JB |
183 | elements = mgmt->u.probe_resp.variable; |
184 | baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable); | |
185 | } else { | |
98c8fccf JB |
186 | baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); |
187 | elements = mgmt->u.beacon.variable; | |
188 | } | |
189 | ||
98c8fccf | 190 | if (baselen > skb->len) |
d48b2968 | 191 | return; |
98c8fccf | 192 | |
b2e506bf | 193 | ieee802_11_parse_elems(elements, skb->len - baselen, false, &elems); |
98c8fccf | 194 | |
0172bb75 | 195 | channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); |
98c8fccf JB |
196 | |
197 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
d48b2968 | 198 | return; |
98c8fccf | 199 | |
d48b2968 | 200 | bss = ieee80211_bss_info_update(local, rx_status, |
98c8fccf | 201 | mgmt, skb->len, &elems, |
d45c4172 | 202 | channel); |
d048e503 | 203 | if (bss) |
d48b2968 | 204 | ieee80211_rx_bss_put(local, bss); |
98c8fccf JB |
205 | } |
206 | ||
4d36ec58 JB |
207 | /* return false if no more work */ |
208 | static bool ieee80211_prep_hw_scan(struct ieee80211_local *local) | |
209 | { | |
210 | struct cfg80211_scan_request *req = local->scan_req; | |
211 | enum ieee80211_band band; | |
212 | int i, ielen, n_chans; | |
213 | ||
214 | do { | |
215 | if (local->hw_scan_band == IEEE80211_NUM_BANDS) | |
216 | return false; | |
217 | ||
218 | band = local->hw_scan_band; | |
219 | n_chans = 0; | |
220 | for (i = 0; i < req->n_channels; i++) { | |
221 | if (req->channels[i]->band == band) { | |
222 | local->hw_scan_req->channels[n_chans] = | |
223 | req->channels[i]; | |
224 | n_chans++; | |
225 | } | |
226 | } | |
227 | ||
228 | local->hw_scan_band++; | |
229 | } while (!n_chans); | |
230 | ||
231 | local->hw_scan_req->n_channels = n_chans; | |
232 | ||
233 | ielen = ieee80211_build_preq_ies(local, (u8 *)local->hw_scan_req->ie, | |
c604b9f2 | 234 | local->hw_scan_ies_bufsize, |
8ee31080 | 235 | req->ie, req->ie_len, band, |
85a237fe | 236 | req->rates[band], 0); |
4d36ec58 | 237 | local->hw_scan_req->ie_len = ielen; |
dcd83976 | 238 | local->hw_scan_req->no_cck = req->no_cck; |
4d36ec58 JB |
239 | |
240 | return true; | |
241 | } | |
242 | ||
d07bfd8b | 243 | static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted, |
e229f844 | 244 | bool was_hw_scan) |
0a51b27e JB |
245 | { |
246 | struct ieee80211_local *local = hw_to_local(hw); | |
0a51b27e | 247 | |
e229f844 | 248 | lockdep_assert_held(&local->mtx); |
5bc75728 | 249 | |
6d3560d4 JB |
250 | /* |
251 | * It's ok to abort a not-yet-running scan (that | |
252 | * we have one at all will be verified by checking | |
253 | * local->scan_req next), but not to complete it | |
254 | * successfully. | |
255 | */ | |
256 | if (WARN_ON(!local->scanning && !aborted)) | |
257 | aborted = true; | |
5bc75728 | 258 | |
e229f844 | 259 | if (WARN_ON(!local->scan_req)) |
d07bfd8b | 260 | return; |
de95a54b | 261 | |
4d36ec58 | 262 | if (was_hw_scan && !aborted && ieee80211_prep_hw_scan(local)) { |
e2fd5dbc JB |
263 | int rc; |
264 | ||
265 | rc = drv_hw_scan(local, | |
266 | rcu_dereference_protected(local->scan_sdata, | |
267 | lockdep_is_held(&local->mtx)), | |
268 | local->hw_scan_req); | |
269 | ||
6eb11a9a | 270 | if (rc == 0) |
d07bfd8b | 271 | return; |
4d36ec58 JB |
272 | } |
273 | ||
274 | kfree(local->hw_scan_req); | |
275 | local->hw_scan_req = NULL; | |
f3b85252 | 276 | |
5ba63533 | 277 | if (local->scan_req != local->int_scan_req) |
2a519311 JB |
278 | cfg80211_scan_done(local->scan_req, aborted); |
279 | local->scan_req = NULL; | |
3aa569c3 | 280 | rcu_assign_pointer(local->scan_sdata, NULL); |
2a519311 | 281 | |
fbe9c429 | 282 | local->scanning = 0; |
58905ca5 | 283 | local->scan_channel = NULL; |
f3b85252 | 284 | |
07ef03ee JB |
285 | /* Set power back to normal operating levels. */ |
286 | ieee80211_hw_config(local, 0); | |
a0daa0e7 | 287 | |
e229f844 SG |
288 | if (!was_hw_scan) { |
289 | ieee80211_configure_filter(local); | |
290 | drv_sw_scan_complete(local); | |
aacde9ee | 291 | ieee80211_offchannel_return(local); |
e229f844 | 292 | } |
0a51b27e | 293 | |
5cff20e6 | 294 | ieee80211_recalc_idle(local); |
e229f844 | 295 | |
0a51b27e | 296 | ieee80211_mlme_notify_scan_completed(local); |
46900298 | 297 | ieee80211_ibss_notify_scan_completed(local); |
472dbc45 | 298 | ieee80211_mesh_notify_scan_completed(local); |
2eb278e0 | 299 | ieee80211_start_next_roc(local); |
0a51b27e | 300 | } |
8789d459 JB |
301 | |
302 | void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) | |
303 | { | |
304 | struct ieee80211_local *local = hw_to_local(hw); | |
305 | ||
306 | trace_api_scan_completed(local, aborted); | |
307 | ||
308 | set_bit(SCAN_COMPLETED, &local->scanning); | |
309 | if (aborted) | |
310 | set_bit(SCAN_ABORTED, &local->scanning); | |
311 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0); | |
312 | } | |
0a51b27e JB |
313 | EXPORT_SYMBOL(ieee80211_scan_completed); |
314 | ||
f3b85252 JB |
315 | static int ieee80211_start_sw_scan(struct ieee80211_local *local) |
316 | { | |
fe57d9f5 JB |
317 | /* Software scan is not supported in multi-channel cases */ |
318 | if (local->use_chanctx) | |
319 | return -EOPNOTSUPP; | |
320 | ||
f3b85252 JB |
321 | /* |
322 | * Hardware/driver doesn't support hw_scan, so use software | |
323 | * scanning instead. First send a nullfunc frame with power save | |
324 | * bit on so that AP will buffer the frames for us while we are not | |
325 | * listening, then send probe requests to each channel and wait for | |
326 | * the responses. After all channels are scanned, tune back to the | |
327 | * original channel and send a nullfunc frame with power save bit | |
328 | * off to trigger the AP to send us all the buffered frames. | |
329 | * | |
330 | * Note that while local->sw_scanning is true everything else but | |
331 | * nullfunc frames and probe requests will be dropped in | |
332 | * ieee80211_tx_h_check_assoc(). | |
333 | */ | |
24487981 | 334 | drv_sw_scan_start(local); |
f3b85252 | 335 | |
de312db3 | 336 | local->leave_oper_channel_time = jiffies; |
977923b0 | 337 | local->next_scan_state = SCAN_DECISION; |
f3b85252 JB |
338 | local->scan_channel_idx = 0; |
339 | ||
aacde9ee | 340 | ieee80211_offchannel_stop_vifs(local); |
a80f7c0b | 341 | |
9c35d7d2 | 342 | /* ensure nullfunc is transmitted before leaving operating channel */ |
39ecc01d | 343 | ieee80211_flush_queues(local, NULL); |
9c35d7d2 | 344 | |
3ac64bee | 345 | ieee80211_configure_filter(local); |
f3b85252 | 346 | |
59bdf3b0 BG |
347 | /* We need to set power level at maximum rate for scanning. */ |
348 | ieee80211_hw_config(local, 0); | |
349 | ||
42935eca | 350 | ieee80211_queue_delayed_work(&local->hw, |
07ef03ee | 351 | &local->scan_work, 0); |
f3b85252 JB |
352 | |
353 | return 0; | |
354 | } | |
355 | ||
133d40f9 SG |
356 | static bool ieee80211_can_scan(struct ieee80211_local *local, |
357 | struct ieee80211_sub_if_data *sdata) | |
358 | { | |
164eb02d SW |
359 | if (local->radar_detect_enabled) |
360 | return false; | |
361 | ||
2eb278e0 | 362 | if (!list_empty(&local->roc_list)) |
133d40f9 SG |
363 | return false; |
364 | ||
365 | if (sdata->vif.type == NL80211_IFTYPE_STATION && | |
366 | sdata->u.mgd.flags & (IEEE80211_STA_BEACON_POLL | | |
367 | IEEE80211_STA_CONNECTION_POLL)) | |
368 | return false; | |
369 | ||
370 | return true; | |
371 | } | |
372 | ||
373 | void ieee80211_run_deferred_scan(struct ieee80211_local *local) | |
374 | { | |
375 | lockdep_assert_held(&local->mtx); | |
376 | ||
377 | if (!local->scan_req || local->scanning) | |
378 | return; | |
379 | ||
e2fd5dbc JB |
380 | if (!ieee80211_can_scan(local, |
381 | rcu_dereference_protected( | |
382 | local->scan_sdata, | |
383 | lockdep_is_held(&local->mtx)))) | |
133d40f9 SG |
384 | return; |
385 | ||
386 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, | |
387 | round_jiffies_relative(0)); | |
388 | } | |
f3b85252 | 389 | |
8a690674 BG |
390 | static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, |
391 | unsigned long *next_delay) | |
392 | { | |
393 | int i; | |
e2fd5dbc | 394 | struct ieee80211_sub_if_data *sdata; |
675a0b04 | 395 | enum ieee80211_band band = local->hw.conf.chandef.chan->band; |
6c17b77b SF |
396 | u32 tx_flags; |
397 | ||
398 | tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK; | |
399 | if (local->scan_req->no_cck) | |
400 | tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE; | |
8a690674 | 401 | |
e2fd5dbc | 402 | sdata = rcu_dereference_protected(local->scan_sdata, |
316b6b5d | 403 | lockdep_is_held(&local->mtx)); |
e2fd5dbc | 404 | |
8a690674 BG |
405 | for (i = 0; i < local->scan_req->n_ssids; i++) |
406 | ieee80211_send_probe_req( | |
407 | sdata, NULL, | |
408 | local->scan_req->ssids[i].ssid, | |
409 | local->scan_req->ssids[i].ssid_len, | |
410 | local->scan_req->ie, local->scan_req->ie_len, | |
411 | local->scan_req->rates[band], false, | |
675a0b04 | 412 | tx_flags, local->hw.conf.chandef.chan, true); |
8a690674 BG |
413 | |
414 | /* | |
415 | * After sending probe requests, wait for probe responses | |
416 | * on the channel. | |
417 | */ | |
418 | *next_delay = IEEE80211_CHANNEL_TIME; | |
419 | local->next_scan_state = SCAN_DECISION; | |
420 | } | |
421 | ||
f3b85252 JB |
422 | static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, |
423 | struct cfg80211_scan_request *req) | |
424 | { | |
425 | struct ieee80211_local *local = sdata->local; | |
f3b85252 JB |
426 | int rc; |
427 | ||
e229f844 SG |
428 | lockdep_assert_held(&local->mtx); |
429 | ||
f3b85252 JB |
430 | if (local->scan_req) |
431 | return -EBUSY; | |
432 | ||
133d40f9 | 433 | if (!ieee80211_can_scan(local, sdata)) { |
6e7e6213 | 434 | /* wait for the work to finish/time out */ |
c0ce77b8 | 435 | local->scan_req = req; |
e2fd5dbc | 436 | rcu_assign_pointer(local->scan_sdata, sdata); |
c0ce77b8 JB |
437 | return 0; |
438 | } | |
439 | ||
f3b85252 JB |
440 | if (local->ops->hw_scan) { |
441 | u8 *ies; | |
f3b85252 | 442 | |
c604b9f2 JB |
443 | local->hw_scan_ies_bufsize = 2 + IEEE80211_MAX_SSID_LEN + |
444 | local->scan_ies_len + | |
445 | req->ie_len; | |
4d36ec58 JB |
446 | local->hw_scan_req = kmalloc( |
447 | sizeof(*local->hw_scan_req) + | |
448 | req->n_channels * sizeof(req->channels[0]) + | |
c604b9f2 | 449 | local->hw_scan_ies_bufsize, GFP_KERNEL); |
4d36ec58 | 450 | if (!local->hw_scan_req) |
f3b85252 JB |
451 | return -ENOMEM; |
452 | ||
4d36ec58 JB |
453 | local->hw_scan_req->ssids = req->ssids; |
454 | local->hw_scan_req->n_ssids = req->n_ssids; | |
455 | ies = (u8 *)local->hw_scan_req + | |
456 | sizeof(*local->hw_scan_req) + | |
457 | req->n_channels * sizeof(req->channels[0]); | |
458 | local->hw_scan_req->ie = ies; | |
cd2bb512 | 459 | local->hw_scan_req->flags = req->flags; |
4d36ec58 JB |
460 | |
461 | local->hw_scan_band = 0; | |
6e7e6213 JL |
462 | |
463 | /* | |
464 | * After allocating local->hw_scan_req, we must | |
465 | * go through until ieee80211_prep_hw_scan(), so | |
466 | * anything that might be changed here and leave | |
467 | * this function early must not go after this | |
468 | * allocation. | |
469 | */ | |
f3b85252 JB |
470 | } |
471 | ||
472 | local->scan_req = req; | |
e2fd5dbc | 473 | rcu_assign_pointer(local->scan_sdata, sdata); |
f3b85252 | 474 | |
8a690674 | 475 | if (local->ops->hw_scan) { |
fbe9c429 | 476 | __set_bit(SCAN_HW_SCANNING, &local->scanning); |
8a690674 | 477 | } else if ((req->n_channels == 1) && |
675a0b04 | 478 | (req->channels[0] == local->_oper_chandef.chan)) { |
9b864870 JB |
479 | /* |
480 | * If we are scanning only on the operating channel | |
481 | * then we do not need to stop normal activities | |
8a690674 BG |
482 | */ |
483 | unsigned long next_delay; | |
484 | ||
485 | __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); | |
486 | ||
487 | ieee80211_recalc_idle(local); | |
488 | ||
489 | /* Notify driver scan is starting, keep order of operations | |
490 | * same as normal software scan, in case that matters. */ | |
491 | drv_sw_scan_start(local); | |
492 | ||
493 | ieee80211_configure_filter(local); /* accept probe-responses */ | |
494 | ||
495 | /* We need to ensure power level is at max for scanning. */ | |
496 | ieee80211_hw_config(local, 0); | |
497 | ||
498 | if ((req->channels[0]->flags & | |
499 | IEEE80211_CHAN_PASSIVE_SCAN) || | |
500 | !local->scan_req->n_ssids) { | |
501 | next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; | |
502 | } else { | |
503 | ieee80211_scan_state_send_probe(local, &next_delay); | |
504 | next_delay = IEEE80211_CHANNEL_TIME; | |
505 | } | |
506 | ||
507 | /* Now, just wait a bit and we are all done! */ | |
508 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, | |
509 | next_delay); | |
510 | return 0; | |
511 | } else { | |
512 | /* Do normal software scan */ | |
fbe9c429 | 513 | __set_bit(SCAN_SW_SCANNING, &local->scanning); |
8a690674 | 514 | } |
6e7e6213 | 515 | |
5cff20e6 | 516 | ieee80211_recalc_idle(local); |
f3b85252 | 517 | |
4d36ec58 JB |
518 | if (local->ops->hw_scan) { |
519 | WARN_ON(!ieee80211_prep_hw_scan(local)); | |
a060bbfe | 520 | rc = drv_hw_scan(local, sdata, local->hw_scan_req); |
4d36ec58 | 521 | } else |
f3b85252 JB |
522 | rc = ieee80211_start_sw_scan(local); |
523 | ||
f3b85252 | 524 | if (rc) { |
4d36ec58 JB |
525 | kfree(local->hw_scan_req); |
526 | local->hw_scan_req = NULL; | |
fbe9c429 | 527 | local->scanning = 0; |
f3b85252 | 528 | |
5cff20e6 JB |
529 | ieee80211_recalc_idle(local); |
530 | ||
f3b85252 | 531 | local->scan_req = NULL; |
e2fd5dbc | 532 | rcu_assign_pointer(local->scan_sdata, NULL); |
f3b85252 JB |
533 | } |
534 | ||
535 | return rc; | |
536 | } | |
537 | ||
df13cce5 HS |
538 | static unsigned long |
539 | ieee80211_scan_get_channel_time(struct ieee80211_channel *chan) | |
540 | { | |
541 | /* | |
542 | * TODO: channel switching also consumes quite some time, | |
543 | * add that delay as well to get a better estimation | |
544 | */ | |
545 | if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) | |
546 | return IEEE80211_PASSIVE_CHANNEL_TIME; | |
547 | return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; | |
548 | } | |
549 | ||
e229f844 SG |
550 | static void ieee80211_scan_state_decision(struct ieee80211_local *local, |
551 | unsigned long *next_delay) | |
7d3be3cc | 552 | { |
142b9f50 | 553 | bool associated = false; |
df13cce5 HS |
554 | bool tx_empty = true; |
555 | bool bad_latency; | |
142b9f50 | 556 | struct ieee80211_sub_if_data *sdata; |
df13cce5 | 557 | struct ieee80211_channel *next_chan; |
cd2bb512 | 558 | enum mac80211_scan_state next_scan_state; |
142b9f50 | 559 | |
df13cce5 HS |
560 | /* |
561 | * check if at least one STA interface is associated, | |
562 | * check if at least one STA interface has pending tx frames | |
563 | * and grab the lowest used beacon interval | |
564 | */ | |
142b9f50 HS |
565 | mutex_lock(&local->iflist_mtx); |
566 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 567 | if (!ieee80211_sdata_running(sdata)) |
142b9f50 HS |
568 | continue; |
569 | ||
570 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { | |
571 | if (sdata->u.mgd.associated) { | |
572 | associated = true; | |
df13cce5 | 573 | |
df13cce5 HS |
574 | if (!qdisc_all_tx_empty(sdata->dev)) { |
575 | tx_empty = false; | |
576 | break; | |
577 | } | |
142b9f50 HS |
578 | } |
579 | } | |
580 | } | |
581 | mutex_unlock(&local->iflist_mtx); | |
582 | ||
b23b025f BG |
583 | next_chan = local->scan_req->channels[local->scan_channel_idx]; |
584 | ||
a80f7c0b | 585 | /* |
07ef03ee JB |
586 | * we're currently scanning a different channel, let's |
587 | * see if we can scan another channel without interfering | |
588 | * with the current traffic situation. | |
589 | * | |
3f892b61 | 590 | * Keep good latency, do not stay off-channel more than 125 ms. |
a80f7c0b | 591 | */ |
a80f7c0b | 592 | |
07ef03ee | 593 | bad_latency = time_after(jiffies + |
3f892b61 SG |
594 | ieee80211_scan_get_channel_time(next_chan), |
595 | local->leave_oper_channel_time + HZ / 8); | |
142b9f50 | 596 | |
cd2bb512 SL |
597 | if (associated && !tx_empty) { |
598 | if (local->scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) | |
599 | next_scan_state = SCAN_ABORT; | |
600 | else | |
601 | next_scan_state = SCAN_SUSPEND; | |
3f892b61 | 602 | } else if (associated && bad_latency) { |
cd2bb512 SL |
603 | next_scan_state = SCAN_SUSPEND; |
604 | } else { | |
605 | next_scan_state = SCAN_SET_CHANNEL; | |
606 | } | |
607 | ||
608 | local->next_scan_state = next_scan_state; | |
142b9f50 | 609 | |
07ef03ee | 610 | *next_delay = 0; |
142b9f50 HS |
611 | } |
612 | ||
2fb3f028 HS |
613 | static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, |
614 | unsigned long *next_delay) | |
615 | { | |
616 | int skip; | |
617 | struct ieee80211_channel *chan; | |
2fb3f028 | 618 | |
7d3be3cc HS |
619 | skip = 0; |
620 | chan = local->scan_req->channels[local->scan_channel_idx]; | |
621 | ||
584991dc | 622 | local->scan_channel = chan; |
b23b025f | 623 | |
07ef03ee JB |
624 | if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) |
625 | skip = 1; | |
7d3be3cc | 626 | |
7d3be3cc HS |
627 | /* advance state machine to next channel/band */ |
628 | local->scan_channel_idx++; | |
629 | ||
0ee9c13c HS |
630 | if (skip) { |
631 | /* if we skip this channel return to the decision state */ | |
632 | local->next_scan_state = SCAN_DECISION; | |
2fb3f028 | 633 | return; |
0ee9c13c | 634 | } |
7d3be3cc HS |
635 | |
636 | /* | |
637 | * Probe delay is used to update the NAV, cf. 11.1.3.2.2 | |
638 | * (which unfortunately doesn't say _why_ step a) is done, | |
639 | * but it waits for the probe delay or until a frame is | |
640 | * received - and the received frame would update the NAV). | |
641 | * For now, we do not support waiting until a frame is | |
642 | * received. | |
643 | * | |
644 | * In any case, it is not necessary for a passive scan. | |
645 | */ | |
646 | if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN || | |
647 | !local->scan_req->n_ssids) { | |
648 | *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; | |
977923b0 | 649 | local->next_scan_state = SCAN_DECISION; |
2fb3f028 | 650 | return; |
7d3be3cc HS |
651 | } |
652 | ||
2fb3f028 | 653 | /* active scan, send probes */ |
7d3be3cc | 654 | *next_delay = IEEE80211_PROBE_DELAY; |
977923b0 | 655 | local->next_scan_state = SCAN_SEND_PROBE; |
7d3be3cc HS |
656 | } |
657 | ||
07ef03ee JB |
658 | static void ieee80211_scan_state_suspend(struct ieee80211_local *local, |
659 | unsigned long *next_delay) | |
660 | { | |
661 | /* switch back to the operating channel */ | |
662 | local->scan_channel = NULL; | |
663 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); | |
664 | ||
aacde9ee SG |
665 | /* disable PS */ |
666 | ieee80211_offchannel_return(local); | |
07ef03ee JB |
667 | |
668 | *next_delay = HZ / 5; | |
669 | /* afterwards, resume scan & go to next channel */ | |
670 | local->next_scan_state = SCAN_RESUME; | |
671 | } | |
672 | ||
673 | static void ieee80211_scan_state_resume(struct ieee80211_local *local, | |
674 | unsigned long *next_delay) | |
675 | { | |
aacde9ee | 676 | ieee80211_offchannel_stop_vifs(local); |
07ef03ee JB |
677 | |
678 | if (local->ops->flush) { | |
39ecc01d | 679 | ieee80211_flush_queues(local, NULL); |
07ef03ee JB |
680 | *next_delay = 0; |
681 | } else | |
682 | *next_delay = HZ / 10; | |
683 | ||
684 | /* remember when we left the operating channel */ | |
685 | local->leave_oper_channel_time = jiffies; | |
686 | ||
687 | /* advance to the next channel to be scanned */ | |
de2ee84d | 688 | local->next_scan_state = SCAN_SET_CHANNEL; |
07ef03ee JB |
689 | } |
690 | ||
c2b13452 | 691 | void ieee80211_scan_work(struct work_struct *work) |
0a51b27e JB |
692 | { |
693 | struct ieee80211_local *local = | |
694 | container_of(work, struct ieee80211_local, scan_work.work); | |
d07bfd8b | 695 | struct ieee80211_sub_if_data *sdata; |
0a51b27e | 696 | unsigned long next_delay = 0; |
d07bfd8b | 697 | bool aborted, hw_scan; |
0a51b27e | 698 | |
259b62e3 | 699 | mutex_lock(&local->mtx); |
8789d459 | 700 | |
e2fd5dbc JB |
701 | sdata = rcu_dereference_protected(local->scan_sdata, |
702 | lockdep_is_held(&local->mtx)); | |
d07bfd8b | 703 | |
8a690674 BG |
704 | /* When scanning on-channel, the first-callback means completed. */ |
705 | if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) { | |
706 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); | |
707 | goto out_complete; | |
708 | } | |
709 | ||
259b62e3 | 710 | if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) { |
8789d459 | 711 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); |
259b62e3 | 712 | goto out_complete; |
8789d459 JB |
713 | } |
714 | ||
259b62e3 SG |
715 | if (!sdata || !local->scan_req) |
716 | goto out; | |
f3b85252 | 717 | |
fbe9c429 | 718 | if (local->scan_req && !local->scanning) { |
f3b85252 JB |
719 | struct cfg80211_scan_request *req = local->scan_req; |
720 | int rc; | |
721 | ||
722 | local->scan_req = NULL; | |
e2fd5dbc | 723 | rcu_assign_pointer(local->scan_sdata, NULL); |
f3b85252 JB |
724 | |
725 | rc = __ieee80211_start_scan(sdata, req); | |
259b62e3 | 726 | if (rc) { |
3aed49ef SG |
727 | /* need to complete scan in cfg80211 */ |
728 | local->scan_req = req; | |
259b62e3 SG |
729 | aborted = true; |
730 | goto out_complete; | |
731 | } else | |
732 | goto out; | |
f3b85252 JB |
733 | } |
734 | ||
5bc75728 JB |
735 | /* |
736 | * Avoid re-scheduling when the sdata is going away. | |
737 | */ | |
9607e6b6 | 738 | if (!ieee80211_sdata_running(sdata)) { |
259b62e3 SG |
739 | aborted = true; |
740 | goto out_complete; | |
f3b85252 | 741 | } |
0a51b27e | 742 | |
f502d09b HS |
743 | /* |
744 | * as long as no delay is required advance immediately | |
745 | * without scheduling a new work | |
746 | */ | |
747 | do { | |
c29acf20 RM |
748 | if (!ieee80211_sdata_running(sdata)) { |
749 | aborted = true; | |
750 | goto out_complete; | |
751 | } | |
752 | ||
977923b0 | 753 | switch (local->next_scan_state) { |
2fb3f028 | 754 | case SCAN_DECISION: |
e229f844 SG |
755 | /* if no more bands/channels left, complete scan */ |
756 | if (local->scan_channel_idx >= local->scan_req->n_channels) { | |
757 | aborted = false; | |
758 | goto out_complete; | |
759 | } | |
760 | ieee80211_scan_state_decision(local, &next_delay); | |
f502d09b | 761 | break; |
2fb3f028 HS |
762 | case SCAN_SET_CHANNEL: |
763 | ieee80211_scan_state_set_channel(local, &next_delay); | |
764 | break; | |
f502d09b HS |
765 | case SCAN_SEND_PROBE: |
766 | ieee80211_scan_state_send_probe(local, &next_delay); | |
767 | break; | |
07ef03ee JB |
768 | case SCAN_SUSPEND: |
769 | ieee80211_scan_state_suspend(local, &next_delay); | |
142b9f50 | 770 | break; |
07ef03ee JB |
771 | case SCAN_RESUME: |
772 | ieee80211_scan_state_resume(local, &next_delay); | |
142b9f50 | 773 | break; |
cd2bb512 SL |
774 | case SCAN_ABORT: |
775 | aborted = true; | |
776 | goto out_complete; | |
f502d09b HS |
777 | } |
778 | } while (next_delay == 0); | |
0a51b27e | 779 | |
42935eca | 780 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay); |
d07bfd8b | 781 | goto out; |
259b62e3 SG |
782 | |
783 | out_complete: | |
e229f844 | 784 | hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning); |
d07bfd8b | 785 | __ieee80211_scan_completed(&local->hw, aborted, hw_scan); |
259b62e3 SG |
786 | out: |
787 | mutex_unlock(&local->mtx); | |
0a51b27e JB |
788 | } |
789 | ||
f3b85252 JB |
790 | int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, |
791 | struct cfg80211_scan_request *req) | |
0a51b27e | 792 | { |
f3b85252 | 793 | int res; |
de95a54b | 794 | |
a1699b75 | 795 | mutex_lock(&sdata->local->mtx); |
f3b85252 | 796 | res = __ieee80211_start_scan(sdata, req); |
a1699b75 | 797 | mutex_unlock(&sdata->local->mtx); |
0a51b27e | 798 | |
f3b85252 | 799 | return res; |
0a51b27e JB |
800 | } |
801 | ||
34bcf715 SG |
802 | int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata, |
803 | const u8 *ssid, u8 ssid_len, | |
804 | struct ieee80211_channel *chan) | |
0a51b27e | 805 | { |
0a51b27e | 806 | struct ieee80211_local *local = sdata->local; |
f3b85252 | 807 | int ret = -EBUSY; |
fb63bc41 | 808 | enum ieee80211_band band; |
2a519311 | 809 | |
a1699b75 | 810 | mutex_lock(&local->mtx); |
0a51b27e | 811 | |
f3b85252 JB |
812 | /* busy scanning */ |
813 | if (local->scan_req) | |
814 | goto unlock; | |
9116dd01 | 815 | |
be4a4b6a JB |
816 | /* fill internal scan request */ |
817 | if (!chan) { | |
34bcf715 SG |
818 | int i, max_n; |
819 | int n_ch = 0; | |
be4a4b6a JB |
820 | |
821 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
822 | if (!local->hw.wiphy->bands[band]) | |
823 | continue; | |
34bcf715 SG |
824 | |
825 | max_n = local->hw.wiphy->bands[band]->n_channels; | |
826 | for (i = 0; i < max_n; i++) { | |
827 | struct ieee80211_channel *tmp_ch = | |
be4a4b6a | 828 | &local->hw.wiphy->bands[band]->channels[i]; |
34bcf715 SG |
829 | |
830 | if (tmp_ch->flags & (IEEE80211_CHAN_NO_IBSS | | |
831 | IEEE80211_CHAN_DISABLED)) | |
832 | continue; | |
833 | ||
834 | local->int_scan_req->channels[n_ch] = tmp_ch; | |
835 | n_ch++; | |
be4a4b6a JB |
836 | } |
837 | } | |
838 | ||
34bcf715 SG |
839 | if (WARN_ON_ONCE(n_ch == 0)) |
840 | goto unlock; | |
841 | ||
842 | local->int_scan_req->n_channels = n_ch; | |
be4a4b6a | 843 | } else { |
34bcf715 SG |
844 | if (WARN_ON_ONCE(chan->flags & (IEEE80211_CHAN_NO_IBSS | |
845 | IEEE80211_CHAN_DISABLED))) | |
846 | goto unlock; | |
847 | ||
be4a4b6a JB |
848 | local->int_scan_req->channels[0] = chan; |
849 | local->int_scan_req->n_channels = 1; | |
850 | } | |
851 | ||
852 | local->int_scan_req->ssids = &local->scan_ssid; | |
853 | local->int_scan_req->n_ssids = 1; | |
5ba63533 JB |
854 | memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); |
855 | local->int_scan_req->ssids[0].ssid_len = ssid_len; | |
9116dd01 | 856 | |
5ba63533 | 857 | ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); |
f3b85252 | 858 | unlock: |
a1699b75 | 859 | mutex_unlock(&local->mtx); |
f3b85252 | 860 | return ret; |
0a51b27e | 861 | } |
5bb644a0 | 862 | |
4136c422 SG |
863 | /* |
864 | * Only call this function when a scan can't be queued -- under RTNL. | |
865 | */ | |
5bb644a0 JB |
866 | void ieee80211_scan_cancel(struct ieee80211_local *local) |
867 | { | |
5bb644a0 | 868 | /* |
b856439b | 869 | * We are canceling software scan, or deferred scan that was not |
4136c422 SG |
870 | * yet really started (see __ieee80211_start_scan ). |
871 | * | |
872 | * Regarding hardware scan: | |
873 | * - we can not call __ieee80211_scan_completed() as when | |
874 | * SCAN_HW_SCANNING bit is set this function change | |
875 | * local->hw_scan_req to operate on 5G band, what race with | |
876 | * driver which can use local->hw_scan_req | |
877 | * | |
878 | * - we can not cancel scan_work since driver can schedule it | |
879 | * by ieee80211_scan_completed(..., true) to finish scan | |
880 | * | |
b856439b EP |
881 | * Hence we only call the cancel_hw_scan() callback, but the low-level |
882 | * driver is still responsible for calling ieee80211_scan_completed() | |
883 | * after the scan was completed/aborted. | |
5bb644a0 | 884 | */ |
4136c422 | 885 | |
a1699b75 | 886 | mutex_lock(&local->mtx); |
b856439b EP |
887 | if (!local->scan_req) |
888 | goto out; | |
889 | ||
890 | if (test_bit(SCAN_HW_SCANNING, &local->scanning)) { | |
891 | if (local->ops->cancel_hw_scan) | |
e2fd5dbc JB |
892 | drv_cancel_hw_scan(local, |
893 | rcu_dereference_protected(local->scan_sdata, | |
894 | lockdep_is_held(&local->mtx))); | |
b856439b | 895 | goto out; |
4136c422 | 896 | } |
b856439b EP |
897 | |
898 | /* | |
899 | * If the work is currently running, it must be blocked on | |
900 | * the mutex, but we'll set scan_sdata = NULL and it'll | |
901 | * simply exit once it acquires the mutex. | |
902 | */ | |
903 | cancel_delayed_work(&local->scan_work); | |
904 | /* and clean up */ | |
905 | __ieee80211_scan_completed(&local->hw, true, false); | |
906 | out: | |
d07bfd8b | 907 | mutex_unlock(&local->mtx); |
5bb644a0 | 908 | } |
79f460ca LC |
909 | |
910 | int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, | |
911 | struct cfg80211_sched_scan_request *req) | |
912 | { | |
913 | struct ieee80211_local *local = sdata->local; | |
bca1e29f | 914 | struct ieee80211_sched_scan_ies sched_scan_ies = {}; |
c604b9f2 JB |
915 | int ret, i, iebufsz; |
916 | ||
917 | iebufsz = 2 + IEEE80211_MAX_SSID_LEN + | |
918 | local->scan_ies_len + req->ie_len; | |
79f460ca | 919 | |
5260a5b2 | 920 | mutex_lock(&local->mtx); |
79f460ca | 921 | |
5260a5b2 | 922 | if (rcu_access_pointer(local->sched_scan_sdata)) { |
79f460ca LC |
923 | ret = -EBUSY; |
924 | goto out; | |
925 | } | |
926 | ||
927 | if (!local->ops->sched_scan_start) { | |
928 | ret = -ENOTSUPP; | |
929 | goto out; | |
930 | } | |
931 | ||
932 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) { | |
d811b3d5 AN |
933 | if (!local->hw.wiphy->bands[i]) |
934 | continue; | |
935 | ||
c604b9f2 | 936 | sched_scan_ies.ie[i] = kzalloc(iebufsz, GFP_KERNEL); |
30dd3edf | 937 | if (!sched_scan_ies.ie[i]) { |
79f460ca LC |
938 | ret = -ENOMEM; |
939 | goto out_free; | |
940 | } | |
941 | ||
30dd3edf JB |
942 | sched_scan_ies.len[i] = |
943 | ieee80211_build_preq_ies(local, sched_scan_ies.ie[i], | |
c604b9f2 JB |
944 | iebufsz, req->ie, req->ie_len, |
945 | i, (u32) -1, 0); | |
79f460ca LC |
946 | } |
947 | ||
30dd3edf JB |
948 | ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies); |
949 | if (ret == 0) | |
5260a5b2 | 950 | rcu_assign_pointer(local->sched_scan_sdata, sdata); |
79f460ca LC |
951 | |
952 | out_free: | |
953 | while (i > 0) | |
30dd3edf | 954 | kfree(sched_scan_ies.ie[--i]); |
79f460ca | 955 | out: |
5260a5b2 | 956 | mutex_unlock(&local->mtx); |
79f460ca LC |
957 | return ret; |
958 | } | |
959 | ||
85a9994a | 960 | int ieee80211_request_sched_scan_stop(struct ieee80211_sub_if_data *sdata) |
79f460ca LC |
961 | { |
962 | struct ieee80211_local *local = sdata->local; | |
30dd3edf | 963 | int ret = 0; |
79f460ca | 964 | |
5260a5b2 | 965 | mutex_lock(&local->mtx); |
79f460ca LC |
966 | |
967 | if (!local->ops->sched_scan_stop) { | |
968 | ret = -ENOTSUPP; | |
969 | goto out; | |
970 | } | |
971 | ||
30dd3edf | 972 | if (rcu_access_pointer(local->sched_scan_sdata)) |
85a9994a | 973 | drv_sched_scan_stop(local, sdata); |
30dd3edf | 974 | |
79f460ca | 975 | out: |
5260a5b2 | 976 | mutex_unlock(&local->mtx); |
79f460ca LC |
977 | |
978 | return ret; | |
979 | } | |
980 | ||
981 | void ieee80211_sched_scan_results(struct ieee80211_hw *hw) | |
982 | { | |
983 | struct ieee80211_local *local = hw_to_local(hw); | |
984 | ||
985 | trace_api_sched_scan_results(local); | |
986 | ||
987 | cfg80211_sched_scan_results(hw->wiphy); | |
988 | } | |
989 | EXPORT_SYMBOL(ieee80211_sched_scan_results); | |
990 | ||
85a9994a LC |
991 | void ieee80211_sched_scan_stopped_work(struct work_struct *work) |
992 | { | |
993 | struct ieee80211_local *local = | |
994 | container_of(work, struct ieee80211_local, | |
995 | sched_scan_stopped_work); | |
85a9994a LC |
996 | |
997 | mutex_lock(&local->mtx); | |
998 | ||
5260a5b2 | 999 | if (!rcu_access_pointer(local->sched_scan_sdata)) { |
85a9994a LC |
1000 | mutex_unlock(&local->mtx); |
1001 | return; | |
1002 | } | |
1003 | ||
5260a5b2 | 1004 | rcu_assign_pointer(local->sched_scan_sdata, NULL); |
85a9994a LC |
1005 | |
1006 | mutex_unlock(&local->mtx); | |
1007 | ||
1008 | cfg80211_sched_scan_stopped(local->hw.wiphy); | |
1009 | } | |
1010 | ||
79f460ca LC |
1011 | void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw) |
1012 | { | |
1013 | struct ieee80211_local *local = hw_to_local(hw); | |
1014 | ||
1015 | trace_api_sched_scan_stopped(local); | |
1016 | ||
85a9994a | 1017 | ieee80211_queue_work(&local->hw, &local->sched_scan_stopped_work); |
79f460ca LC |
1018 | } |
1019 | EXPORT_SYMBOL(ieee80211_sched_scan_stopped); |